TY - INPR
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A1 - Actis, M.
A1 - Aghajani, T.
A1 - Agnetta, G.
A1 - Aguilar, J.
A1 - Aharonian, Felix A.
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A1 - Aleksic, J.
A1 - Alfaro, R.
A1 - Aliu, E.
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A1 - Allan, D.
A1 - Allekotte, I.
A1 - Amato, E.
A1 - Anderson, J.
A1 - Angüner, Ekrem Oǧuzhan
A1 - Antonelli, L. A.
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A1 - Barnacka, Anna
A1 - Barnstedt, Jürgen
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A1 - Basso, S.
A1 - Bastieri, D.
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A1 - Baushev, Anton N.
A1 - Becerra Gonzalez, J.
A1 - Becherini, Yvonne
A1 - Bechtol, K. C.
A1 - Tjus, J. Becker
A1 - Beckmann, Volker
A1 - Bednarek, W.
A1 - Behera, B.
A1 - Belluso, M.
A1 - Benbow, W.
A1 - Berdugo, J.
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A1 - Birsin, E.
A1 - Bissaldi, E.
A1 - Biteau, Jonathan
A1 - Bitossi, M.
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A1 - Bobkov, A. A.
A1 - Boccone, V.
A1 - Boettcher, Markus
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A1 - Bogart, J.
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A1 - Boisson, Catherine
A1 - Boix Gargallo, J.
A1 - Bolmont, J.
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A1 - Bonifacio, P.
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A1 - Bordas, Pol
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A1 - Borkowski, Janett
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A1 - Briggs, M. S.
A1 - Bringmann, T.
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A1 - Brun, Pierre
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A1 - Bugaev, V.
A1 - Bulgarelli, A.
A1 - Bulik, Tomasz
A1 - Busetto, G.
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A1 - Camprecios, J.
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A1 - Carmona, E.
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A1 - Carr, John
A1 - Carton, P. H.
A1 - Casanova, Sabrina
A1 - Casiraghi, M.
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A1 - Conforti, V.
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A1 - de la Calle, I.
A1 - De La Vega, G. A.
A1 - Lopez, R. de los Reyes
A1 - De Lotto, B.
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A1 - de Naurois, M.
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A1 - Della Volpe, D.
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A1 - Diaz, C.
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A1 - Dickherber, R.
A1 - Dickinson, H.
A1 - Diez-Blanco, V.
A1 - Digel, S.
A1 - Dimitrov, D.
A1 - Disset, G.
A1 - Djannati-Ataï, A.
A1 - Doert, M.
A1 - Dohmke, M.
A1 - Domainko, W.
A1 - Prester, Dijana Dominis
A1 - Donat, A.
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A1 - Doro, M.
A1 - Dournaux, J-L.
A1 - Drake, G.
A1 - Dravins, D.
A1 - Drury, L.
A1 - Dubois, F.
A1 - Dubois, R.
A1 - Dubus, G.
A1 - Dufour, C.
A1 - Dumas, D.
A1 - Dumm, J.
A1 - Durand, D.
A1 - Dyks, J.
A1 - Dyrda, M.
A1 - Ebr, J.
A1 - Edy, E.
A1 - Egberts, Kathrin
A1 - Eger, P.
A1 - Einecke, S.
A1 - Eleftheriadis, C.
A1 - Elles, S.
A1 - Emmanoulopoulos, D.
A1 - Engelhaupt, D.
A1 - Enomoto, R.
A1 - Ernenwein, J-P
A1 - Errando, M.
A1 - Etchegoyen, A.
A1 - Evans, P.
A1 - Falcone, A.
A1 - Fantinel, D.
A1 - Farakos, K.
A1 - Farnier, C.
A1 - Fasola, G.
A1 - Favill, B.
A1 - Fede, E.
A1 - Federici, S.
A1 - Fegan, S.
A1 - Feinstein, F.
A1 - Ferenc, D.
A1 - Ferrando, P.
A1 - Fesquet, M.
A1 - Fiasson, A.
A1 - Fillin-Martino, E.
A1 - Fink, D.
A1 - Finley, C.
A1 - Finley, J. P.
A1 - Fiorini, M.
A1 - Firpo Curcoll, R.
A1 - Flores, H.
A1 - Florin, D.
A1 - Focke, W.
A1 - Foehr, C.
A1 - Fokitis, E.
A1 - Font, L.
A1 - Fontaine, G.
A1 - Fornasa, M.
A1 - Foerster, A.
A1 - Fortson, L.
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A1 - Franckowiak, A.
A1 - Fransson, C.
A1 - Fraser, G.
A1 - Frei, R.
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A1 - Fresnillo, L.
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A1 - Fujita, Y.
A1 - Fukazawa, Y.
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A1 - Funk, S.
A1 - Gaebele, W.
A1 - Gabici, S.
A1 - Gabriele, R.
A1 - Gadola, A.
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A1 - Gall, D.
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A1 - Gamez-Garcia, J.
A1 - Garcia, B.
A1 - Garcia Lopez, R.
A1 - Gardiol, D.
A1 - Garrido, D.
A1 - Garrido, L.
A1 - Gascon, D.
A1 - Gaug, M.
A1 - Gaweda, J.
A1 - Gebremedhin, L.
A1 - Geffroy, N.
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A1 - Ghigo, M.
A1 - Giannakaki, E.
A1 - Gianotti, F.
A1 - Giarrusso, S.
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A1 - Giebels, B.
A1 - Gika, V.
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A1 - Glanzman, T.
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A1 - Gonzalez, F.
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A1 - Sanchez, F.
A1 - Sanchez-Conde, M.
A1 - Sandoval, A.
A1 - Sandaker, H.
A1 - Sant'Ambrogio, E.
A1 - Santangelo, A.
A1 - Santos, E. M.
A1 - Sanuy, A.
A1 - Sapozhnikov, L.
A1 - Sarkar, S.
A1 - Sartore, N.
A1 - Sasaki, H.
A1 - Satalecka, K.
A1 - Sawada, M.
A1 - Scalzotto, V.
A1 - Scapin, V.
A1 - Scarcioffolo, M.
A1 - Schafer, J.
A1 - Schanz, T.
A1 - Schlenstedt, S.
A1 - Schlickeiser, R.
A1 - Schmidt, T.
A1 - Schmoll, J.
A1 - Schovanek, P.
A1 - Schroedter, M.
A1 - Schultz, C.
A1 - Schultze, J.
A1 - Schulz, A.
A1 - Schure, K.
A1 - Schwab, T.
A1 - Schwanke, U.
A1 - Schwarz, J.
A1 - Schwarzburg, S.
A1 - Schweizer, T.
A1 - Schwemmer, S.
A1 - Segreto, A.
A1 - Seiradakis, J. -H.
A1 - Sembroski, G. H.
A1 - Seweryn, K.
A1 - Sharma, M.
A1 - Shayduk, M.
A1 - Shellard, R. C.
A1 - Shi, J.
A1 - Shibata, T.
A1 - Shibuya, A.
A1 - Shum, E.
A1 - Sidoli, L.
A1 - Sidz, M.
A1 - Sieiro, J.
A1 - Sikora, M.
A1 - Silk, J.
A1 - Sillanpaa, A.
A1 - Singh, B. B.
A1 - Sitarek, J.
A1 - Skole, C.
A1 - Smareglia, R.
A1 - Smith, A.
A1 - Smith, D.
A1 - Smith, J.
A1 - Smith, N.
A1 - Sobczynska, D.
A1 - Sol, H.
A1 - Sottile, G.
A1 - Sowinski, M.
A1 - Spanier, F.
A1 - Spiga, D.
A1 - Spyrou, S.
A1 - Stamatescu, V.
A1 - Stamerra, A.
A1 - Starling, R.
A1 - Stawarz, L.
A1 - Steenkamp, R.
A1 - Stegmann, Christian
A1 - Steiner, S.
A1 - Stergioulas, N.
A1 - Sternberger, R.
A1 - Sterzel, M.
A1 - Stinzing, F.
A1 - Stodulski, M.
A1 - Straumann, U.
A1 - Strazzeri, E.
A1 - Stringhetti, L.
A1 - Suarez, A.
A1 - Suchenek, M.
A1 - Sugawara, R.
A1 - Sulanke, K. -H.
A1 - Sun, S.
A1 - Supanitsky, A. D.
A1 - Suric, T.
A1 - Sutcliffe, P.
A1 - Sykes, J.
A1 - Szanecki, M.
A1 - Szepieniec, T.
A1 - Szostek, A.
A1 - Tagliaferri, G.
A1 - Tajima, H.
A1 - Takahashi, H.
A1 - Takahashi, K.
A1 - Takalo, L.
A1 - Takami, H.
A1 - Talbot, C.
A1 - Tammi, J.
A1 - Tanaka, M.
A1 - Tanaka, S.
A1 - Tasan, J.
A1 - Tavani, M.
A1 - Tavernet, J. -P.
A1 - Tejedor, L. A.
A1 - Telezhinsky, Igor O.
A1 - Temnikov, P.
A1 - Tenzer, C.
A1 - Terada, Y.
A1 - Terrier, R.
A1 - Teshima, M.
A1 - Testa, V.
A1 - Tezier, D.
A1 - Thuermann, D.
A1 - Tibaldo, L.
A1 - Tibolla, O.
A1 - Tiengo, A.
A1 - Tluczykont, M.
A1 - Todero Peixoto, C. J.
A1 - Tokanai, F.
A1 - Tokarz, M.
A1 - Toma, K.
A1 - Torii, K.
A1 - Tornikoski, M.
A1 - Torres, D. F.
A1 - Torres, M.
A1 - Tosti, G.
A1 - Totani, T.
A1 - Toussenel, C.
A1 - Tovmassian, G.
A1 - Travnicek, P.
A1 - Trifoglio, M.
A1 - Troyano, I.
A1 - Tsinganos, K.
A1 - Ueno, H.
A1 - Umehara, K.
A1 - Upadhya, S. S.
A1 - Usher, T.
A1 - Uslenghi, M.
A1 - Valdes-Galicia, J. F.
A1 - Vallania, P.
A1 - Vallejo, G.
A1 - van Driel, W.
A1 - van Eldik, C.
A1 - Vandenbrouke, J.
A1 - Vanderwalt, J.
A1 - Vankov, H.
A1 - Vasileiadis, G.
A1 - Vassiliev, V.
A1 - Veberic, D.
A1 - Vegas, I.
A1 - Vercellone, S.
A1 - Vergani, S.
A1 - Veyssiere, C.
A1 - Vialle, J. P.
A1 - Viana, A.
A1 - Videla, M.
A1 - Vincent, P.
A1 - Vincent, S.
A1 - Vink, J.
A1 - Vlahakis, N.
A1 - Vlahos, L.
A1 - Vogler, P.
A1 - Vollhardt, A.
A1 - von Gunten, H. P.
A1 - Vorobiov, S.
A1 - Vuerli, C.
A1 - Waegebaert, V.
A1 - Wagner, R.
A1 - Wagner, R. G.
A1 - Wagner, S.
A1 - Wakely, S. P.
A1 - Walter, R.
A1 - Walther, T.
A1 - Warda, K.
A1 - Warwick, R.
A1 - Wawer, P.
A1 - Wawrzaszek, R.
A1 - Webb, N.
A1 - Wegner, P.
A1 - Weinstein, A.
A1 - Weitzel, Q.
A1 - Welsing, R.
A1 - Werner, M.
A1 - Wetteskind, H.
A1 - White, R.
A1 - Wierzcholska, A.
A1 - Wiesand, S.
A1 - Wilkinson, M.
A1 - Williams, D. A.
A1 - Willingale, R.
A1 - Winiarski, K.
A1 - Wischnewski, R.
A1 - Wisniewski, L.
A1 - Wood, M.
A1 - Woernlein, A.
A1 - Xiong, Q.
A1 - Yadav, K. K.
A1 - Yamamoto, H.
A1 - Yamamoto, T.
A1 - Yamazaki, R.
A1 - Yanagita, S.
A1 - Yebras, J. M.
A1 - Yelos, D.
A1 - Yoshida, A.
A1 - Yoshida, T.
A1 - Yoshikoshi, T.
A1 - Zabalza, V.
A1 - Zacharias, M.
A1 - Zajczyk, A.
A1 - Zanin, R.
A1 - Zdziarski, A.
A1 - Zech, Alraune
A1 - Zhao, A.
A1 - Zhou, X.
A1 - Zietara, K.
A1 - Ziolkowski, J.
A1 - Ziolkowski, P.
A1 - Zitelli, V.
A1 - Zurbach, C.
A1 - Zychowski, P.
T1 - Introducing the CTA concept
T2 - Astroparticle physics
N2 - The Cherenkov Telescope Array (CTA) is a new observatory for very high-energy (VHE) gamma rays. CTA has ambitions science goals, for which it is necessary to achieve full-sky coverage, to improve the sensitivity by about an order of magnitude, to span about four decades of energy, from a few tens of GeV to above 100 TeV with enhanced angular and energy resolutions over existing VHE gamma-ray observatories. An international collaboration has formed with more than 1000 members from 27 countries in Europe, Asia, Africa and North and South America. In 2010 the CTA Consortium completed a Design Study and started a three-year Preparatory Phase which leads to production readiness of CTA in 2014. In this paper we introduce the science goals and the concept of CTA, and provide an overview of the project.
KW - TeV gamma-ray astronomy
KW - Air showers
KW - Cherenkov Telescopes
Y1 - 2013
U6 - https://doi.org/10.1016/j.astropartphys.2013.01.007
SN - 0927-6505
SN - 1873-2852
VL - 43
IS - 2
SP - 3
EP - 18
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Abdalla, H.
A1 - Adam, R.
A1 - Aharonian, Felix A.
A1 - Benkhali, F. Ait
A1 - Angüner, Ekrem Oǧuzhan
A1 - Arcaro, C.
A1 - Armand, C.
A1 - Armstrong, T.
A1 - Ashkar, H.
A1 - Backes, M.
A1 - Baghmanyan, V.
A1 - Martins, V. Barbosa
A1 - Barnacka, A.
A1 - Barnard, M.
A1 - Becherini, Y.
A1 - Berge, D.
A1 - Bernlohr, K.
A1 - Bi, B.
A1 - Bottcher, M.
A1 - Boisson, C.
A1 - Bolmont, J.
A1 - de Lavergne, M. de Bony
A1 - Bordas, Pol
A1 - Breuhaus, M.
A1 - Brun, F.
A1 - Brun, P.
A1 - Bryan, M.
A1 - Buchele, M.
A1 - Bulik, T.
A1 - Bylund, T.
A1 - Caroff, S.
A1 - Carosi, A.
A1 - Casanova, Sabrina
A1 - Chand, T.
A1 - Chandra, S.
A1 - Chen, A.
A1 - Cotter, G.
A1 - Curylo, M.
A1 - Mbarubucyeye, J. Damascene
A1 - Davids, I. D.
A1 - Davies, J.
A1 - Deil, C.
A1 - Devin, J.
A1 - deWilt, P.
A1 - Dirson, L.
A1 - Djannati-Atai, A.
A1 - Dmytriiev, A.
A1 - Donath, A.
A1 - Doroshenko, V.
A1 - Duffy, C.
A1 - Dyks, J.
A1 - Egberts, Kathrin
A1 - Eichhorn, F.
A1 - Einecke, S.
A1 - Emery, G.
A1 - Ernenwein, J. -P.
A1 - Feijen, K.
A1 - Fegan, S.
A1 - Fiasson, A.
A1 - de Clairfontaine, G. Fichet
A1 - Fontaine, G.
A1 - Funk, S.
A1 - Fussling, Matthias
A1 - Gabici, S.
A1 - Gallant, Y. A.
A1 - Giavitto, G.
A1 - Giunti, L.
A1 - Glawion, D.
A1 - Glicenstein, J. F.
A1 - Gottschall, D.
A1 - Grondin, M. -H.
A1 - Hahn, J.
A1 - Haupt, M.
A1 - Hermann, G.
A1 - Hinton, J. A.
A1 - Hofmann, W.
A1 - Hoischen, Clemens
A1 - Holch, T. L.
A1 - Holler, M.
A1 - Horbe, M.
A1 - Horns, D.
A1 - Huber, D.
A1 - Jamrozy, M.
A1 - Jankowsky, D.
A1 - Jankowsky, F.
A1 - Jardin-Blicq, A.
A1 - Joshi, V.
A1 - Jung-Richardt, I.
A1 - Kasai, E.
A1 - Kastendieck, M. A.
A1 - Katarzynski, K.
A1 - Katz, U.
A1 - Khangulyan, D.
A1 - Khelifi, B.
A1 - Klepser, S.
A1 - Kluzniak, W.
A1 - Komin, Nu.
A1 - Konno, R.
A1 - Kosack, K.
A1 - Kostunin, D.
A1 - Kreter, M.
A1 - Lamanna, G.
A1 - Lemiere, A.
A1 - Lemoine-Goumard, M.
A1 - Lenain, J. -P.
A1 - Levy, C.
A1 - Lohse, T.
A1 - Lypova, I.
A1 - Mackey, J.
A1 - Majumdar, J.
A1 - Malyshev, D.
A1 - Malyshev, D.
A1 - Marandon, V.
A1 - Marchegiani, P.
A1 - Marcowith, A.
A1 - Mares, A.
A1 - Marti-Devesa, G.
A1 - Marx, R.
A1 - Maurin, G.
A1 - Meintjes, P. J.
A1 - Meyer, M.
A1 - Mitchell, A.
A1 - Moderski, R.
A1 - Mohamed, M.
A1 - Mohrmann, L.
A1 - Montanari, A.
A1 - Moore, C.
A1 - Morris, P.
A1 - Moulin, E.
A1 - Muller, J.
A1 - Murach, T.
A1 - Nakashima, K.
A1 - Nayerhoda, A.
A1 - de Naurois, M.
A1 - Ndiyavala, H.
A1 - Niederwanger, F.
A1 - Niemiec, J.
A1 - Oakes, L.
A1 - O'Brien, Patrick
A1 - Odaka, H.
A1 - Ohm, S.
A1 - Olivera-Nieto, L.
A1 - Wilhelmi, E. de Ona
A1 - Ostrowski, M.
A1 - Oya, I.
A1 - Panter, M.
A1 - Panny, S.
A1 - Parsons, R. D.
A1 - Peron, G.
A1 - Peyaud, B.
A1 - Piel, Q.
A1 - Pita, S.
A1 - Poireau, V.
A1 - Noel, A. Priyana
A1 - Prokhorov, D. A.
A1 - Prokoph, H.
A1 - Puhlhofer, G.
A1 - Punch, M.
A1 - Quirrenbach, A.
A1 - Raab, S.
A1 - Rauth, R.
A1 - Reichherzer, P.
A1 - Reimer, A.
A1 - Reimer, O.
A1 - Remy, Q.
A1 - Renaud, M.
A1 - Rieger, F.
A1 - Rinchiuso, L.
A1 - Romoli, C.
A1 - Rowell, G.
A1 - Rudak, B.
A1 - Ruiz-Velasco, E.
A1 - Sahakian, V.
A1 - Sailer, S.
A1 - Sanchez, D. A.
A1 - Santangelo, A.
A1 - Sasaki, M.
A1 - Scalici, M.
A1 - Schussler, F.
A1 - Schutte, H. M.
A1 - Schwanke, U.
A1 - Schwemmer, S.
A1 - Seglar-Arroyo, M.
A1 - Senniappan, M.
A1 - Seyffert, A. S.
A1 - Shafi, N.
A1 - Shiningayamwe, K.
A1 - Simoni, R.
A1 - Sinha, A.
A1 - Sol, H.
A1 - Specovius, A.
A1 - Spencer, S.
A1 - Spir-Jacob, M.
A1 - Stawarz, L.
A1 - Sun, L.
A1 - Steenkamp, R.
A1 - Stegmann, C.
A1 - Steinmassl, S.
A1 - Steppa, C.
A1 - Takahashi, T.
A1 - Tavernier, T.
A1 - Taylor, A. M.
A1 - Terrier, R.
A1 - Tiziani, D.
A1 - Tluczykont, M.
A1 - Tomankova, L.
A1 - Trichard, C.
A1 - Tsirou, M.
A1 - Tuffs, R.
A1 - Uchiyama, Y.
A1 - van der Walt, D. J.
A1 - van Eldik, C.
A1 - van Rensburg, C.
A1 - van Soelen, B.
A1 - Vasileiadis, G.
A1 - Veh, J.
A1 - Venter, C.
A1 - Vincent, P.
A1 - Vink, J.
A1 - Volk, H. J.
A1 - Vuillaume, T.
A1 - Wadiasingh, Z.
A1 - Wagner, S. J.
A1 - Watson, J.
A1 - Werner, F.
A1 - White, R.
A1 - Wierzcholska, A.
A1 - Wong, Yu Wun
A1 - Yusafzai, A.
A1 - Zacharias, M.
A1 - Zanin, R.
A1 - Zargaryan, D.
A1 - Zdziarski, A. A.
A1 - Zech, Alraune
A1 - Zhu, S. J.
A1 - Ziegler, A.
A1 - Zorn, J.
A1 - Zouari, S.
A1 - Zywucka, N.
T1 - An extreme particle accelerator in the Galactic plane
BT - HESS J1826-130
JF - Astronomy and astrophysics : an international weekly journal
N2 - The unidentified very-high-energy (VHE; E > 0.1 TeV) gamma -ray source, HESS J1826-130, was discovered with the High Energy Stereoscopic System (HESS) in the Galactic plane. The analysis of 215 h of HESS data has revealed a steady gamma -ray flux from HESS J1826-130, which appears extended with a half-width of 0.21 degrees +/- 0.02
(stat)degrees
stat degrees +/- 0.05
(sys)degrees sys degrees . The source spectrum is best fit with either a power-law function with a spectral index Gamma = 1.78 +/- 0.10(stat) +/- 0.20(sys) and an exponential cut-off at 15.2
(+5.5)(-3.2) -3.2+5.5 TeV, or a broken power-law with Gamma (1) = 1.96 +/- 0.06(stat) +/- 0.20(sys), Gamma (2) = 3.59 +/- 0.69(stat) +/- 0.20(sys) for energies below and above E-br = 11.2 +/- 2.7 TeV, respectively. The VHE flux from HESS J1826-130 is contaminated by the extended emission of the bright, nearby pulsar wind nebula, HESS J1825-137, particularly at the low end of the energy spectrum. Leptonic scenarios for the origin of HESS J1826-130 VHE emission related to PSR J1826-1256 are confronted by our spectral and morphological analysis. In a hadronic framework, taking into account the properties of dense gas regions surrounding HESS J1826-130, the source spectrum would imply an astrophysical object capable of accelerating the parent particle population up to greater than or similar to 200 TeV. Our results are also discussed in a multiwavelength context, accounting for both the presence of nearby supernova remnants, molecular clouds, and counterparts detected in radio, X-rays, and TeV energies.
KW - ISM: supernova remnants
KW - ISM: clouds
KW - gamma rays: general
KW - gamma rays:
KW - ISM
Y1 - 2020
U6 - https://doi.org/10.1051/0004-6361/202038851
SN - 0004-6361
SN - 1432-0746
VL - 644
PB - EDP Sciences
CY - Les Ulis
ER -
TY - JOUR
A1 - Abdalla, Hassan E.
A1 - Aharonian, Felix A.
A1 - Ait Benkhali, Faical
A1 - Angüner, Ekrem Oǧuzhan
A1 - Arakawa, M.
A1 - Arcaro, C.
A1 - Armand, C.
A1 - Arrieta, M.
A1 - Backes, Michael
A1 - Barnard, M.
A1 - Becherini, Yvonne
A1 - Tjus, J. Becker
A1 - Berge, D.
A1 - Bernhard, S.
A1 - Bernlöhr, Konrad
A1 - Blackwell, R.
A1 - Böttcher, Markus
A1 - Boisson, C.
A1 - Bolmont, Julien
A1 - Bonnefoy, S.
A1 - Bordas, Pol
A1 - Bregeon, J.
A1 - Brun, F.
A1 - Brun, P.
A1 - Bryan, M.
A1 - Büchele, M.
A1 - Bulik, Tomasz
A1 - Bylund, Tomas
A1 - Capasso, Massimo
A1 - Caroff, S.
A1 - Carosi, A.
A1 - Casanova, Sabrina
A1 - Cerruti, Matteo
A1 - Chakraborty, Nachiketa
A1 - Chandra, S.
A1 - Chaves, R. C. G.
A1 - Chen, A.
A1 - Colafrancesco, Sergio
A1 - Condon, B.
A1 - Davids, Isak
A1 - Deil, Christoph
A1 - Devin, J.
A1 - deWilt, P.
A1 - Dirson, L.
A1 - Djannati-Atai, A.
A1 - Dmytriiev, A.
A1 - Donath, Axel
A1 - Doroshenko, Victor
A1 - Dyks, J.
A1 - Egberts, Kathrin
A1 - Emery, G.
A1 - Ernenwein, J. -P.
A1 - Eschbach, Stefan
A1 - Fegan, S.
A1 - Fiasson, Armand
A1 - Fontaine, G.
A1 - Funk, Sebastian
A1 - Füßling, Matthias
A1 - Gabici, S.
A1 - Gallant, Y. A.
A1 - Gate, F.
A1 - Giavitto, Gianluca
A1 - Eisenacher Glawion, Dorit
A1 - Glicenstein, Jean-François
A1 - Gottschall, D.
A1 - Grondin, Marie-Hélène
A1 - Hahn, J.
A1 - Haupt, M.
A1 - Heinzelmann, G.
A1 - Henri, Gilles
A1 - Hermann, G.
A1 - Hinton, James Anthony
A1 - Hofmann, Werner
A1 - Hoischen, Clemens
A1 - Holch, Tim Lukas
A1 - Holler, M.
A1 - Horns, D.
A1 - Huber, D.
A1 - Iwasaki, H.
A1 - Jacholkowska, A.
A1 - Jamrozy, M.
A1 - Jankowsky, David
A1 - Jankowsky, Felix
A1 - Jouvin, L.
A1 - Jung-Richardt, I.
A1 - Kastendieck, M. A.
A1 - Katarzyński, Krzysztof
A1 - Katsuragawa, M.
A1 - Katz, U.
A1 - Kerszberg, D.
A1 - Khangulyan, D.
A1 - Khelifi, B.
A1 - King, J.
A1 - Klepser, S.
A1 - Kluzniak, W.
A1 - Komin, Nu.
A1 - Kosack, K.
A1 - Krakau, S.
A1 - Kraus, M.
A1 - Kruger, P. P.
A1 - Lamanna, G.
A1 - Lau, J.
A1 - Lefaucheur, J.
A1 - Lemiere, A.
A1 - Lemoine-Goumard, M.
A1 - Lenain, J. -P.
A1 - Leser, Eva
A1 - Lohse, T.
A1 - Lorentz, M.
A1 - Lopez-Coto, R.
A1 - Lypova, I.
A1 - Malyshev, D.
A1 - Marandon, V.
A1 - Marcowith, A.
A1 - Mariaud, C.
A1 - Marti-Devesa, G.
A1 - Marx, R.
A1 - Maurin, G.
A1 - Meintjes, P. J.
A1 - Mitchell, A. M. W.
A1 - Moderski, R.
A1 - Mohamed, M.
A1 - Mohrmann, L.
A1 - Moulin, E.
A1 - Murach, T.
A1 - Nakashima, S.
A1 - de Naurois, M.
A1 - Ndiyavala, H.
A1 - Niederwanger, F.
A1 - Niemiec, J.
A1 - Oakes, L.
A1 - Odaka, H.
A1 - Ohm, S.
A1 - Ostrowski, M.
A1 - Oya, I.
A1 - Padovani, M.
A1 - Panter, M.
A1 - Parsons, R. D.
A1 - Perennes, C.
A1 - Petrucci, P. -O.
A1 - Peyaud, B.
A1 - Piel, Q.
A1 - Pita, S.
A1 - Poireau, V.
A1 - Noel, A. Priyana
A1 - Prokhorov, D. A.
A1 - Prokoph, H.
A1 - Puehlhofer, G.
A1 - Punch, M.
A1 - Quirrenbach, A.
A1 - Raab, S.
A1 - Rauth, R.
A1 - Reimer, A.
A1 - Reimer, O.
A1 - Renaud, M.
A1 - Rieger, F.
A1 - Rinchiuso, L.
A1 - Romoli, C.
A1 - Rowell, G.
A1 - Rudak, B.
A1 - Ruiz-Velasco, E.
A1 - Sahakian, V.
A1 - Saito, S.
A1 - Sanchez, D. A.
A1 - Santangelo, A.
A1 - Sasaki, M.
A1 - Schlickeiser, R.
A1 - Schussler, F.
A1 - Schulz, A.
A1 - Schwanke, U.
A1 - Schwemmer, S.
A1 - Seglar-Arroyo, M.
A1 - Senniappan, M.
A1 - Seyffert, A. S.
A1 - Shafi, N.
A1 - Shilon, I.
A1 - Shiningayamwe, K.
A1 - Simoni, R.
A1 - Sinha, A.
A1 - Sol, H.
A1 - Spanier, F.
A1 - Specovius, A.
A1 - Spir-Jacob, M.
A1 - Stawarz, L.
A1 - Steenkamp, R.
A1 - Stegmann, Christian
A1 - Steppa, Constantin Beverly
A1 - Takahashi, T.
A1 - Tavernet, J. -P.
A1 - Tavernier, T.
A1 - Taylor, A. M.
A1 - Terrier, R.
A1 - Tibaldo, L.
A1 - Tiziani, D.
A1 - Tluczykont, M.
A1 - Trichard, C.
A1 - Tsirou, M.
A1 - Tsuji, N.
A1 - Tuffs, R.
A1 - Uchiyama, Y.
A1 - van der Walt, D. J.
A1 - van Eldik, C.
A1 - van Rensburg, C.
A1 - van Soelen, B.
A1 - Vasileiadis, G.
A1 - Veh, J.
A1 - Venter, C.
A1 - Viana, A.
A1 - Vincent, P.
A1 - Vink, J.
A1 - Voisin, F.
A1 - Voelk, H. J.
A1 - Vuillaume, T.
A1 - Wadiasingh, Z.
A1 - Wagner, S. J.
A1 - Wagner, R. M.
A1 - White, R.
A1 - Wierzcholska, A.
A1 - Yang, R.
A1 - Zaborov, D.
A1 - Zacharias, M.
A1 - Zanin, R.
A1 - Zdziarski, A.
A1 - Zech, Alraune
A1 - Zefi, F.
A1 - Ziegler, A.
A1 - Zorn, J.
A1 - Zywucka, N.
A1 - Cirelli, M.
A1 - Panci, P.
A1 - Sala, F.
A1 - Silk, J.
A1 - Taoso, M.
T1 - Searches for gamma-ray lines and 'pure WIMP' spectra from Dark Matter annihilations in dwarf galaxies with H.E.S.S.
JF - Journal of cosmology and astroparticle physics
N2 - Dwarf spheroidal galaxies are among the most promising targets for detecting signals of Dark Matter (DM) annihilations. The H.E.S.S. experiment has observed five of these systems for a total of about 130 hours. The data are re-analyzed here, and, in the absence of any detected signals, are interpreted in terms of limits on the DM annihilation cross section. Two scenarios are considered: i) DM annihilation into mono-energetic gamma-rays and ii) DM in the form of pure WIMP multiplets that, annihilating into all electroweak bosons, produce a distinctive gamma-ray spectral shape with a high-energy peak at the DM mass and a lower-energy continuum. For case i), upper limits at 95% confidence level of about less than or similar to 3 x 10(-25) cm(3) s(-1) are obtained in the mass range of 400 GeV to 1TeV. For case ii), the full spectral shape of the models is used and several excluded regions are identified, but the thermal masses of the candidates are not robustly ruled out.
KW - dark matter detectors
KW - dark matter experiments
KW - dwarfs galaxies
KW - gamma ray detectors
Y1 - 2018
U6 - https://doi.org/10.1088/1475-7516/2018/11/037
SN - 1475-7516
IS - 11
PB - IOP Publishing Ltd. (Bristol)
CY - Bristol
ER -
TY - JOUR
A1 - Abdalla, Hassan E.
A1 - Abramowski, Attila
A1 - Aharonian, Felix A.
A1 - Benkhali, Faiçal Ait
A1 - Akhperjanian, A. G.
A1 - Angüner, Ekrem Oǧuzhan
A1 - Arrieta, M.
A1 - Aubert, Pierre
A1 - Backes, Michael
A1 - Balzer, Arnim
A1 - Barnard, Michelle
A1 - Becherini, Yvonne
A1 - Tjus, Julia Becker
A1 - Berge, David
A1 - Bernhard, Sabrina
A1 - Bernlöhr, K.
A1 - Birsin, E.
A1 - Blackwell, R.
A1 - Bottcher, Markus
A1 - Boisson, Catherine
A1 - Bolmont, J.
A1 - Bordas, Pol
A1 - Bregeon, Johan
A1 - Brun, Francois
A1 - Brun, Pierre
A1 - Bryan, Mark
A1 - Bulik, Tomasz
A1 - Capasso, M.
A1 - Carr, John
A1 - Casanova, Sabrina
A1 - Chakraborty, N.
A1 - Chalme-Calvet, R.
A1 - Chaves, Ryan C. G.
A1 - Chen, Andrew
A1 - Chevalier, J.
A1 - Chretien, M.
A1 - Colafrancesco, Sergio
A1 - Cologna, Gabriele
A1 - Condon, B.
A1 - Conrad, Jan
A1 - Couturier, C.
A1 - Cui, Y.
A1 - Davids, I. D.
A1 - Degrange, B.
A1 - Deil, Christoph
A1 - deWilt, P.
A1 - Djannati-Atai, Arache
A1 - Domainko, Wilfried
A1 - Donath, Axel
A1 - Dubus, Guillaume
A1 - Dutson, Kate
A1 - Dyks, J.
A1 - Dyrda, M.
A1 - Edwards, T.
A1 - Egberts, Kathrin
A1 - Eger, P.
A1 - Ernenwein, J. -P.
A1 - Eschbach, S.
A1 - Farnier, C.
A1 - Fegan, Stuart
A1 - Fernandes, M. V.
A1 - Fiasson, A.
A1 - Fontaine, G.
A1 - Foerster, A.
A1 - Funk, S.
A1 - Füßling, Matthias
A1 - Gabici, Stefano
A1 - Gajdus, M.
A1 - Gallant, Y. A.
A1 - Garrigoux, T.
A1 - Giavitto, Gianluca
A1 - Giebels, B.
A1 - Glicenstein, J. F.
A1 - Gottschall, Daniel
A1 - Goyal, A.
A1 - Grondin, M. -H.
A1 - Grudzinska, M.
A1 - Hadasch, Daniela
A1 - Hahn, J.
A1 - Hawkes, J.
A1 - Heinzelmann, G.
A1 - Henri, Gilles
A1 - Hermann, G.
A1 - Hervet, Olivier
A1 - Hillert, A.
A1 - Hinton, James Anthony
A1 - Hofmann, Werner
A1 - Hoischen, Clemens
A1 - Holler, M.
A1 - Horns, D.
A1 - Ivascenko, Alex
A1 - Jacholkowska, A.
A1 - Jamrozy, Marek
A1 - Janiak, M.
A1 - Jankowsky, D.
A1 - Jankowsky, Felix
A1 - Jingo, M.
A1 - Jogler, Tobias
A1 - Jouvin, Lea
A1 - Jung-Richardt, Ira
A1 - Kastendieck, M. A.
A1 - Katarzynski, Krzysztof
A1 - Katz, Uli
A1 - Kerszberg, D.
A1 - Khelifi, B.
A1 - Kieffer, M.
A1 - King, J.
A1 - Klepser, S.
A1 - Klochkov, Dmitry
A1 - Kluzniak, W.
A1 - Kolitzus, D.
A1 - Komin, Nu.
A1 - Kosack, K.
A1 - Krakau, S.
A1 - Kraus, Michael
A1 - Krayzel, F.
A1 - Kruger, P. P.
A1 - Laffon, H.
A1 - Lamanna, G.
A1 - Lau, Jeanie
A1 - Lees, J. -P.
A1 - Lefaucheur, J.
A1 - Lefranc, V.
A1 - Lemiere, A.
A1 - Lemoine-Goumard, M.
A1 - Lenain, J. -P.
A1 - Leser, Eva
A1 - Lohse, Thomas
A1 - Lorentz, M.
A1 - Lui, R.
A1 - Lypova, Iryna
A1 - Marandon, Vincent
A1 - Marcowith, Alexandre
A1 - Mariaud, C.
A1 - Marx, R.
A1 - Maurin, G.
A1 - Maxted, N.
A1 - Mayer, Michael
A1 - Meintjes, Petrus Johannes
A1 - Menzler, U.
A1 - Meyer, Manuel
A1 - Mitchell, A. M. W.
A1 - Moderski, R.
A1 - Mohamed, M.
A1 - Mora, K.
A1 - Moulin, E.
A1 - Murach, T.
A1 - de Naurois, Mathieu
A1 - Niederwanger, F.
A1 - Niemiec, J.
A1 - Oakes, L.
A1 - Odaka, Hirokazu
A1 - Ohm, Stefan
A1 - Oettl, S.
A1 - Ostrowski, M.
A1 - Oya, I.
A1 - Padovani, Marco
A1 - Panter, M.
A1 - Parsons, R. D.
A1 - Arribas, M. Paz
A1 - Pekeur, N. W.
A1 - Pelletier, G.
A1 - Petrucci, P. -O.
A1 - Peyaud, B.
A1 - Pita, S.
A1 - Poon, Helen
A1 - Prokhorov, Dmitry
A1 - Prokoph, Heike
A1 - Puehlhofer, Gerd
A1 - Punch, Michael
A1 - Quirrenbach, Andreas
A1 - Raab, S.
A1 - Reimer, Anita
A1 - Reimer, Olaf
A1 - Renaud, M.
A1 - de los Reyes, R.
A1 - Rieger, Frank
A1 - Romoli, Carlo
A1 - Rosier-Lees, S.
A1 - Rowell, G.
A1 - Rudak, B.
A1 - Rulten, C. B.
A1 - Sahakian, V.
A1 - Salek, David
A1 - Sanchez, David A.
A1 - Santangelo, Andrea
A1 - Sasaki, Manami
A1 - Schlickeiser, Reinhard
A1 - Schussler, F.
A1 - Schulz, Andreas
A1 - Schwanke, U.
A1 - Schwemmer, S.
A1 - Seyffert, A. S.
A1 - Shafi, N.
A1 - Simoni, R.
A1 - Sol, H.
A1 - Spanier, Felix
A1 - Spengler, G.
A1 - Spiess, F.
A1 - Stawarz, Lukasz
A1 - Steenkamp, R.
A1 - Stegmann, Christian
A1 - Stinzing, F.
A1 - Stycz, K.
A1 - Sushch, Iurii
A1 - Tavernet, J. -P.
A1 - Tavernier, T.
A1 - Taylor, A. M.
A1 - Terrier, R.
A1 - Tluczykont, Martin
A1 - Trichard, C.
A1 - Tuffs, R.
A1 - van der Walt, Johan
A1 - van Eldik, Christopher
A1 - van Soelen, Brian
A1 - Vasileiadis, Georges
A1 - Veh, J.
A1 - Venter, C.
A1 - Viana, A.
A1 - Vincent, P.
A1 - Vink, Jacco
A1 - Voisin, F.
A1 - Voelk, Heinrich J.
A1 - Vuillaume, Thomas
A1 - Wadiasingh, Z.
A1 - Wagner, Stefan J.
A1 - Wagner, P.
A1 - Wagner, R. M.
A1 - White, R.
A1 - Wierzcholska, Alicja
A1 - Willmann, P.
A1 - Woernlein, A.
A1 - Wouters, Denis
A1 - Yang, R.
A1 - Zabalza, Victor
A1 - Zaborov, D.
A1 - Zacharias, M.
A1 - Zdziarski, A. A.
A1 - Zech, Andreas
A1 - Zefi, F.
A1 - Ziegler, A.
A1 - Zywucka, Natalia
T1 - Search for Dark Matter Annihilations towards the Inner Galactic Halo from 10 Years of Observations with HESS
JF - Physical review letters
N2 - The inner region of the Milky Way halo harbors a large amount of dark matter (DM). Given its proximity, it is one of the most promising targets to look for DM. We report on a search for the annihilations of DM particles using gamma-ray observations towards the inner 300 pc of the Milky Way, with the H.E.S.S. array of ground-based Cherenkov telescopes. The analysis is based on a 2D maximum likelihood method using Galactic Center (GC) data accumulated by H.E.S.S. over the last 10 years (2004-2014), and does not show any significant gamma-ray signal above background. Assuming Einasto and Navarro-Frenk-White DM density profiles at the GC, we derive upper limits on the annihilation cross section . These constraints are the strongest obtained so far in the TeV DM mass range and improve upon previous limits by a factor 5. For the Einasto profile, the constraints reach values of 6 x 10(-26) cm(3) s(-1) in the W+W- channel for a DM particle mass of 1.5 TeV, and 2 x 10(-26) cm(3) s(-1) in the tau(+)tau(-) channel for a 1 TeV mass. For the first time, ground-based gamma-ray observations have reached sufficient sensitivity to probe values expected from the thermal relic density for TeV DM particles.
Y1 - 2016
U6 - https://doi.org/10.1103/PhysRevLett.117.111301
SN - 0031-9007
SN - 1079-7114
VL - 117
PB - American Physical Society
CY - College Park
ER -
TY - GEN
A1 - Abramowski, Attila
A1 - Aharonian, Felix A.
A1 - Benkhali, Faical Ait
A1 - Akhperjanian, A. G.
A1 - Angüner, Ekrem Oǧuzhan
A1 - Backes, Michael
A1 - Balenderan, Shangkari
A1 - Balzer, Arnim
A1 - Barnacka, Anna
A1 - Becherini, Yvonne
A1 - Tjus, Julia Becker
A1 - Berge, David
A1 - Bernhard, Sabrina
A1 - Bernlöhr, Konrad
A1 - Birsin, E.
A1 - Biteau, Jonathan
A1 - Böttcher, Markus
A1 - Boisson, Catherine
A1 - Bolmont, J.
A1 - Bordas, Pol
A1 - Bregeon, Johan
A1 - Brun, Francois
A1 - Brun, Pierre
A1 - Bryan, Mark
A1 - Bulik, Tomasz
A1 - Carrigan, Svenja
A1 - Casanova, Sabrina
A1 - Chadwick, Paula M.
A1 - Chakraborty, Nachiketa
A1 - Chalme-Calvet, R.
A1 - Chaves, Ryan C. G.
A1 - Chretien, M.
A1 - Colafrancesco, Sergio
A1 - Cologna, Gabriele
A1 - Conrad, Jan
A1 - Couturier, Claire
A1 - Cui, Yudong
A1 - Davids, Isak Delberth
A1 - Degrange, Bernhard
A1 - Deil, Christoph
A1 - deWilt, P.
A1 - Djannati-Ataï, A.
A1 - Domainko, Wilfried
A1 - Donath, Axel
A1 - Dubus, G.
A1 - Dutson, K.
A1 - Dyks, J.
A1 - Dyrda, M.
A1 - Edwards, Tanya
A1 - Egberts, Kathrin
A1 - Eger, Peter
A1 - Espigat, P.
A1 - Farnier, C.
A1 - Fegan, Stephen
A1 - Feinstein, Fabrice
A1 - Fernandes, Milton Virgilio
A1 - Fernandez, Diane
A1 - Fiasson, A.
A1 - Fontaine, Gerard
A1 - Förster, Andreas
A1 - Fuessling, M.
A1 - Gabici, S.
A1 - Gajdus, M.
A1 - Gallant, Yves A.
A1 - Garrigoux, Tania
A1 - Giavitto, G.
A1 - Giebels, Berrie
A1 - Glicenstein, Jean-Francois
A1 - Gottschall, Daniel
A1 - Grondin, M. -H.
A1 - Grudzinska, M.
A1 - Hadasch, Daniela
A1 - Haeffner, S.
A1 - Hahn, Joachim
A1 - Harris, Jonathan
A1 - Heinzelmann, Götz
A1 - Henri, G.
A1 - Hermann, German
A1 - Hervet, O.
A1 - Hillert, Andreas
A1 - Hinton, James Anthony
A1 - Hofmann, Werner
A1 - Hofverberg, Petter
A1 - Holler, Markus
A1 - Horns, Dieter
A1 - Ivascenko, Alex
A1 - Jacholkowska, A.
A1 - Jahn, C.
A1 - Jamrozy, Marek
A1 - Janiak, M.
A1 - Jankowsky, F.
A1 - Jung-Richardt, I.
A1 - Kastendieck, Max Anton
A1 - Katarzynski, K.
A1 - Katz, U.
A1 - Kaufmann, S.
A1 - Khelifi, B.
A1 - Kieffer, Michel
A1 - Klepser, S.
A1 - Klochkov, Dmitry
A1 - Kluzniak, W.
A1 - Kolitzus, David
A1 - Komin, Nu
A1 - Kosack, Karl
A1 - Krakau, Steffen
A1 - Krayzel, F.
A1 - Krueger, Pat P.
A1 - Laffon, H.
A1 - Lamanna, G.
A1 - Lefaucheur, J.
A1 - Lefranc, Valentin
A1 - Lemiere, A.
A1 - Lemoine-Goumard, M.
A1 - Lenain, J. -P.
A1 - Lohse, Thomas
A1 - Lopatin, A.
A1 - Lu, Chia-Chun
A1 - Marandon, Vincent
A1 - Marcowith, Alexandre
A1 - Marx, Ramin
A1 - Maurin, G.
A1 - Maxted, Nigel
A1 - Mayer, Michael
A1 - McComb, T. J. Lowry
A1 - Mehault, J.
A1 - Meintjes, P. J.
A1 - Menzler, Ulf
A1 - Meyer, M.
A1 - Mitchell, Alison M. W.
A1 - Moderski, R.
A1 - Mohamed, M.
A1 - Mora, K.
A1 - Moulin, Emmanuel
A1 - Murach, Thomas
A1 - de Naurois, Mathieu
A1 - Niemiec, J.
A1 - Nolan, Sam J.
A1 - Oakes, Louise
A1 - Odaka, Hirokazu
A1 - Ohm, S.
A1 - Optiz, Björn
A1 - Ostrowski, Michal
A1 - Oya, I.
A1 - Panter, Michael
A1 - Parsons, R. Daniel
A1 - Arribas, M. Paz
A1 - Pekeur, Nikki W.
A1 - Pelletier, G.
A1 - Petrucci, P. -O.
A1 - Peyaud, B.
A1 - Pita, S.
A1 - Poon, Helen
A1 - Pühlhofer, Gerd
A1 - Punch, M.
A1 - Quirrenbach, A.
A1 - Raab, S.
A1 - Reichardt, I.
A1 - Reimer, Anita
A1 - Reimer, Olaf
A1 - Renaud, Metz
A1 - de los Reyes, Raquel
A1 - Rieger, Frank
A1 - Romoli, C.
A1 - Rosier-Lees, S.
A1 - Rowell, G.
A1 - Rudak, B.
A1 - Rulten, C. B.
A1 - Sahakian, Vardan
A1 - Salek, D.
A1 - Sanchez, David M.
A1 - Santangelo, Andrea
A1 - Schlickeiser, Reinhard
A1 - Schuessler, F.
A1 - Schulz, A.
A1 - Schwanke, Ullrich
A1 - Schwarzburg, S.
A1 - Schwemmer, S.
A1 - Sol, H.
A1 - Spanier, Felix
A1 - Spengler, G.
A1 - Spies, Franziska
A1 - Stawarz, Lukasz
A1 - Steenkamp, Riaan
A1 - Stegmann, Christian
A1 - Stinzing, F.
A1 - Stycz, K.
A1 - Sushch, Iurii
A1 - Tavernet, J. -P.
A1 - Tavernier, T.
A1 - Taylor, A. M.
A1 - Terrier, R.
A1 - Tluczykont, Martin
A1 - Trichard, C.
A1 - Valerius, K.
A1 - van Eldik, C.
A1 - van Soelen, B.
A1 - Vasileiadis, Georges
A1 - Veh, J.
A1 - Venter, Christo
A1 - Viana, Aion
A1 - Vincent, P.
A1 - Vink, Jacco
A1 - Völk, Heinrich J.
A1 - Volpe, Francesca
A1 - Vorster, Martine
A1 - Vuillaume, T.
A1 - Wagner, S. J.
A1 - Wagner, P.
A1 - Wagner, R. M.
A1 - Ward, Martin
A1 - Weidinger, Matthias
A1 - Weitzel, Quirin
A1 - White, R.
A1 - Wierzcholska, A.
A1 - Willmann, P.
A1 - Woernlein, A.
A1 - Wouters, D.
A1 - Yang, Ruizhi
A1 - Zabalza, Victor
A1 - Zaborov, Dmitry
A1 - Zacharias, M.
A1 - Zdziarski, A. A.
A1 - Zech, Alraune
A1 - Zechlin, Hannes -S.
T1 - H.E.S.S. detection of TeV emission from the interaction region between the supernova remnant G349.7+0.2 and a molecular cloud (vol 574, A100, 2015)
T2 - Astronomy and astrophysics : an international weekly journal
KW - gamma rays: general
KW - ISM: supernova remnants
KW - ISM: clouds
KW - errata, addenda
Y1 - 2015
U6 - https://doi.org/10.1051/0004-6361/201425070e
SN - 1432-0746
VL - 580
PB - EDP Sciences
CY - Les Ulis
ER -
TY - JOUR
A1 - Archambault, S.
A1 - Aune, T.
A1 - Behera, B.
A1 - Beilicke, M.
A1 - Benbow, W.
A1 - Berger, K.
A1 - Bird, R.
A1 - Biteau, Jonathan
A1 - Bugaev, V.
A1 - Byrum, K.
A1 - Cardenzana, J. V.
A1 - Cerruti, M.
A1 - Chen, Xuhui
A1 - Ciupik, L.
A1 - Connolly, M. P.
A1 - Cui, Wei
A1 - Dumm, J.
A1 - Errando, M.
A1 - Falcone, A.
A1 - Federici, Simone
A1 - Feng, Q.
A1 - Finley, J. P.
A1 - Fleischhack, H.
A1 - Fortson, L.
A1 - Furniss, A.
A1 - Galante, N.
A1 - Gillanders, G. H.
A1 - Griffin, S.
A1 - Griffiths, S. T.
A1 - Grube, J.
A1 - Gyuk, G.
A1 - Hanna, D.
A1 - Holder, J.
A1 - Hughes, G.
A1 - Humensky, T. B.
A1 - Johnson, C. A.
A1 - Kaaret, P.
A1 - Kertzman, M.
A1 - Khassen, Y.
A1 - Kieda, D.
A1 - Krawczynski, H.
A1 - Krennrich, F.
A1 - Kumar, S.
A1 - Lang, M. J.
A1 - Madhavan, A. S.
A1 - Maier, G.
A1 - McCann, A.
A1 - Meagher, K.
A1 - Moriarty, P.
A1 - Mukherjee, R.
A1 - Nieto, Daniel
A1 - Ong, R. A.
A1 - Otte, A. N.
A1 - Park, N.
A1 - Pohl, Martin
A1 - Popkow, A.
A1 - Prokoph, H.
A1 - Quinn, J.
A1 - Ragan, K.
A1 - Rajotte, J.
A1 - Reyes, L. C.
A1 - Reynolds, P. T.
A1 - Richards, G. T.
A1 - Roache, E.
A1 - Sembroski, G. H.
A1 - Shahinyan, K.
A1 - Staszak, D.
A1 - Telezhinsky, Igor O.
A1 - Tucci, J. V.
A1 - Tyler, J.
A1 - Varlotta, A.
A1 - Vassiliev, V. V.
A1 - Vincent, S.
A1 - Wakely, S. P.
A1 - Weinstein, A.
A1 - Welsing, R.
A1 - Wilhelm, Alina
A1 - Williams, D. A.
A1 - Ackermann, Margit
A1 - Ajello, M.
A1 - Albert, A.
A1 - Baldini, L.
A1 - Bastieri, D.
A1 - Bellazzini, R.
A1 - Bissaldi, E.
A1 - Bregeon, Johan
A1 - Buehler, R.
A1 - Buson, S.
A1 - Caliandro, G. A.
A1 - Cameron, R. A.
A1 - Caraveo, P. A.
A1 - Cavazzuti, E.
A1 - Charles, E.
A1 - Chiang, J.
A1 - Ciprini, S.
A1 - Claus, R.
A1 - Cutini, S.
A1 - de Angelis, A.
A1 - de Palma, F.
A1 - Dermer, C. D.
A1 - Digel, S. W.
A1 - Di Venere, L.
A1 - Drell, P. S.
A1 - Favuzzi, C.
A1 - Franckowiak, A.
A1 - Fusco, P.
A1 - Gargano, F.
A1 - Gasparrini, D.
A1 - Giglietto, N.
A1 - Giordano, F.
A1 - Giroletti, M.
A1 - Grenier, I. A.
A1 - Guiriec, S.
A1 - Jogler, T.
A1 - Kuss, M.
A1 - Larsson, S.
A1 - Latronico, L.
A1 - Longo, F.
A1 - Loparco, F.
A1 - Lubrano, P.
A1 - Madejski, G. M.
A1 - Mayer, M.
A1 - Mazziotta, Mario Nicola
A1 - Michelson, P. F.
A1 - Mizuno, T.
A1 - Monzani, M. E.
A1 - Morselli, Aldo
A1 - Murgia, S.
A1 - Nuss, E.
A1 - Ohsugi, T.
A1 - Ormes, J. F.
A1 - Paneque, D.
A1 - Perkins, J. S.
A1 - Piron, F.
A1 - Pivato, G.
A1 - Raino, S.
A1 - Razzano, M.
A1 - Reimer, A.
A1 - Reimer, Olaf
A1 - Ritz, S.
A1 - Schaal, M.
A1 - Sgro, C.
A1 - Siskind, E. J.
A1 - Spinelli, P.
A1 - Takahashi, H.
A1 - Tibaldo, L.
A1 - Tinivella, M.
A1 - Troja, E.
A1 - Vianello, G.
A1 - Werner, M.
A1 - Wood, M.
T1 - Deep broadband observations of the distant gamma-ray blazar PKS 1424+240
JF - The astrophysical journal : an international review of spectroscopy and astronomical physics ; Part 2, Letters
N2 - We present deep VERITAS observations of the blazar PKS 1424+240, along with contemporaneous Fermi Large Area Telescope, Swift X-ray Telescope, and Swift UV Optical Telescope data between 2009 February 19 and 2013 June 8. This blazar resides at a redshift of z >= 0.6035, displaying a significantly attenuated gamma-ray flux above 100 GeV due to photon absorption via pair-production with the extragalactic background light. We present more than 100 hr of VERITAS observations over three years, a multiwavelength light curve, and the contemporaneous spectral energy distributions. The source shows a higher flux of (2.1 +/- 0.3) x 10(-7) photons m(-2) s(-1) above 120 GeV in 2009 and 2011 as compared to the flux measured in 2013, corresponding to (1.02 +/- 0.08) x 10-7 photons m(-2) s(-1) above 120 GeV. The measured differential very high energy (VHE; E >= 100 GeV) spectral indices are Gamma = 3.8 +/- 0.3, 4.3 +/- 0.6 and 4.5 +/- 0.2 in 2009, 2011, and 2013, respectively. No significant spectral change across the observation epochs is detected. We find no evidence for variability at gamma-ray opacities of greater than tau = 2, where it is postulated that any variability would be small and occur on timescales longer than a year if hadronic cosmic-ray interactions with extragalactic photon fields provide a secondary VHE photon flux. The data cannot rule out such variability due to low statistics.
KW - BL Lacertae objects: individual (PKS 1424+240)-cosmic background radiation
KW - gamma rays: galaxies
Y1 - 2014
U6 - https://doi.org/10.1088/2041-8205/785/1/L16
SN - 2041-8205
SN - 2041-8213
VL - 785
IS - 1
PB - IOP Publ. Ltd.
CY - Bristol
ER -
TY - JOUR
A1 - Richardson, Noel D.
A1 - Russell, Christopher M. P.
A1 - St-Jean, Lucas
A1 - Moffat, Anthony F. J.
A1 - St-Louis, Nicole
A1 - Shenar, Tomer
A1 - Pablo, Herbert
A1 - Hill, Grant M.
A1 - Ramiaramanantsoa, Tahina
A1 - Corcoran, Michael
A1 - Hamuguchi, Kenji
A1 - Eversberg, Thomas
A1 - Miszalski, Brent
A1 - Chene, Andre-Nicolas
A1 - Waldron, Wayne
A1 - Kotze, Enrico J.
A1 - Kotze, Marissa M.
A1 - Luckas, Paul
A1 - Cacella, Paulo
A1 - Heathcote, Bernard
A1 - Powles, Jonathan
A1 - Bohlsen, Terry
A1 - Locke, Malcolm
A1 - Handler, Gerald
A1 - Kuschnig, Rainer
A1 - Pigulski, Andrzej
A1 - Popowicz, Adam
A1 - Wade, Gregg A.
A1 - Weiss, Werner W.
T1 - The variability of the BRITE-est Wolf-Rayet binary, gamma(2) Velorum-I. Photometric and spectroscopic evidence for colliding winds
JF - Monthly notices of the Royal Astronomical Society
N2 - We report on the first multi-colour precision light curve of the bright Wolf-Rayet binary gamma(2) Velorum, obtained over six months with the nanosatellites in the BRITE-Constellation fleet. In parallel, we obtained 488 high-resolution optical spectra of the system. In this first report on the data sets, we revise the spectroscopic orbit and report on the bulk properties of the colliding winds. We find a dependence of both the light curve and excess emission properties that scales with the inverse of the binary separation. When analysing the spectroscopic properties in combination with the photometry, we find that the phase dependence is caused only by excess emission in the lines, and not from a changing continuum. We also detect a narrow, high-velocity absorption component from the He perpendicular to lambda 5876 transition, which appears twice in the orbit. We calculate smoothed-particle hydrodynamical simulations of the colliding winds and can accurately associate the absorption from He perpendicular to to the leading and trailing arms of the wind shock cone passing tangentially through our line of sight. The simulations also explain the general strength and kinematics of the emission excess observed in wind lines such as C III lambda 5696 of the system. These results represent the first in a series of investigations into the winds and properties of gamma(2) Velorum through multi-technique and multi-wavelength observational campaigns.
KW - stars: early type
KW - stars: individual: gamma(2) Vel
KW - stars: mass loss
KW - stars: winds
KW - outflows
KW - stars: Wolf-Rayet
Y1 - 2017
U6 - https://doi.org/10.1093/mnras/stx1731
SN - 0035-8711
SN - 1365-2966
VL - 471
SP - 2715
EP - 2729
PB - Oxford Univ. Press
CY - Oxford
ER -
TY - JOUR
A1 - Ramiaramanantsoa, Tahina
A1 - Moffat, Anthony F. J.
A1 - Harmon, Robert
A1 - Ignace, R.
A1 - St-Louis, Nicole
A1 - Vanbeveren, Dany
A1 - Shenar, Tomer
A1 - Pablo, Herbert
A1 - Richardson, Noel D.
A1 - Howarth, Ian D.
A1 - Stevens, Ian R.
A1 - Piaulet, Caroline
A1 - St-Jean, Lucas
A1 - Eversberg, Thomas
A1 - Pigulski, Andrzej
A1 - Popowicz, Adam
A1 - Kuschnig, Rainer
A1 - Zoclonska, Elzbieta
A1 - Buysschaert, Bram
A1 - Handler, Gerald
A1 - Weiss, Werner W.
A1 - Wade, Gregg A.
A1 - Rucinski, Slavek M.
A1 - Zwintz, Konstanze
A1 - Luckas, Paul
A1 - Heathcote, Bernard
A1 - Cacella, Paulo
A1 - Powles, Jonathan
A1 - Locke, Malcolm
A1 - Bohlsen, Terry
A1 - Chené, André-Nicolas
A1 - Miszalski, Brent
A1 - Waldron, Wayne L.
A1 - Kotze, Marissa M.
A1 - Kotze, Enrico J.
A1 - Böhm, Torsten
T1 - BRITE-Constellation high-precision time-dependent photometry of the early O-type supergiant zeta Puppis unveils the photospheric drivers of its small- and large-scale wind structures
JF - Monthly notices of the Royal Astronomical Society
N2 - From 5.5 months of dual-band optical photometric monitoring at the 1 mmag level, BRITE-Constellation has revealed two simultaneous types of variability in the O4I(n)fp star ζ Puppis: one single periodic non-sinusoidal component superimposed on a stochastic component. The monoperiodic component is the 1.78-d signal previously detected by Coriolis/Solar Mass Ejection Imager, but this time along with a prominent first harmonic. The shape of this signal changes over time, a behaviour that is incompatible with stellar oscillations but consistent with rotational modulation arising from evolving bright surface inhomogeneities. By means of a constrained non-linear light-curve inversion algorithm, we mapped the locations of the bright surface spots and traced their evolution. Our simultaneous ground-based multisite spectroscopic monitoring of the star unveiled cyclical modulation of its He ii λ4686 wind emission line with the 1.78-d rotation period, showing signatures of corotating interaction regions that turn out to be driven by the bright photospheric spots observed by BRITE. Traces of wind clumps are also observed in the He ii λ4686 line and are correlated with the amplitudes of the stochastic component of the light variations probed by BRITE at the photosphere, suggesting that the BRITE observations additionally unveiled the photospheric drivers of wind clumps in ζ Pup and that the clumping phenomenon starts at the very base of the wind. The origins of both the bright surface inhomogeneities and the stochastic light variations remain unknown, but a subsurface convective zone might play an important role in the generation of these two types of photospheric variability.
KW - techniques: photometric
KW - techniques: spectroscopic
KW - stars: massive
KW - stars: rotation
KW - starspots
KW - supergiants
KW - stars: winds, outflows
Y1 - 2017
U6 - https://doi.org/10.1093/mnras/stx2671
SN - 0035-8711
SN - 1365-2966
VL - 473
IS - 4
SP - 5532
EP - 5569
PB - Oxford Univ. Press
CY - Oxford
ER -
TY - JOUR
A1 - Böhm, Uwe
A1 - Kucken, M.
A1 - Hauffe, D.
A1 - Gerstengarbe, F. W.
A1 - Werner, P. C.
A1 - Flechsig, M.
A1 - Keuler, K.
A1 - Block, A.
A1 - Ahrens, W.
A1 - Nocke, T.
T1 - Reliability of regional climate model simulations of extremes and of long-term climate
N2 - We present two case studies that demonstrate how a common evaluation methodology can be used to assess the reliability of regional climate model simulations from different fields of research. In Case I, we focused on the agricultural yield loss risk for maize in Northeastern Brazil during a drought linked to an El-Nino event. In Case II, the present-day regional climatic conditions in Europe for a 10-year period are simulated. To comprehensively evaluate the model results for both kinds of investigations, we developed a general methodology. On its basis, we elaborated and implemented modules to assess the quality of model results using both advanced visualization techniques and statistical algorithms. Besides univariate approaches for individual near-surface parameters, we used multivariate statistics to investigate multiple near-surface parameters of interest together. For the latter case, we defined generalized quality measures to quantify the model's accuracy. Furthermore, we elaborated a diagnosis tool applicable for atmospheric variables to assess the model's accuracy in representing the physical processes above the surface under various aspects. By means of this evaluation approach, it could be demonstrated in Case Study I that the accuracy of the applied regional climate model resides at the same level as that we found for another regional model and a global model. Excessive precipitation during the rainy season in coastal regions could be identified as a major contribution leading to this result. In Case Study II, we also identified the accuracy of the investigated mean characteristics for near- surface temperature and precipitation to be comparable to another regional model. In this case, an artificial modulation of the used initial and boundary data during preprocessing could be identified as the major source of error in the simulation. Altogether, the achieved results for the presented investigations indicate the potential of our methodology to be applied as a common test bed to different fields of research in regional climate modeling
Y1 - 2004
SN - 1561-8633
ER -
TY - JOUR
A1 - Asghari, N.
A1 - Broeg, C.
A1 - Carone, L.
A1 - Casas-Miranda, R.
A1 - Palacio, J. C. C.
A1 - Csillik, I.
A1 - Dvorak, R.
A1 - Freistetter, F.
A1 - Hadjivantsides, G.
A1 - Hussmann, H.
A1 - Khramova, A.
A1 - Khristoforova, M.
A1 - Khromova, I.
A1 - Kitiashivilli, I.
A1 - Kozlowski, S.
A1 - Laakso, T.
A1 - Laczkowski, T.
A1 - Lytvinenko, D.
A1 - Miloni, O.
A1 - Morishima, R.
A1 - Moro-Martin, A.
A1 - Paksyutov, V.
A1 - Pal, A.
A1 - Patidar, V.
A1 - Pecnik, B.
A1 - Peles, O.
A1 - Pyo, J.
A1 - Quinn, T.
A1 - Rodriguez, A.
A1 - Romano, C.
A1 - Saikia, E.
A1 - Stadel, J.
A1 - Thiel, M.
A1 - Todorovic, N.
A1 - Veras, D.
A1 - Neto, E. V.
A1 - Vilagi, J.
A1 - von Bloh, Werner
A1 - Zechner, R.
A1 - Zhuchkova, E.
T1 - Stability of terrestrial planets in the habitable zone of G1 777 A, HD 72659, G1 614, 47 Uma and HD 4208
N2 - We have undertaken a thorough dynamical investigation of five extrasolar planetary systems using extensive numerical experiments. The systems Gl 777 A, HD 72659, Gl 614, 47 Uma and HD 4208 were examined concerning the question of whether they could host terrestrial-like planets in their habitable zones (HZ). First we investigated the mean motion resonances between fictitious terrestrial planets and the existing gas giants in these five extrasolar systems. Then a fine grid of initial conditions for a potential terrestrial planet within the HZ was chosen for each system, from which the stability of orbits was then assessed by direct integrations over a time interval of 1 million years. For each of the five systems the 2-dimensional grid of initial conditions contained 80 eccentricity points for the Jovian planet and up to 160 semimajor axis points for the fictitious planet. The computations were carried out using a Lie-series integration method with an adaptive step size control. This integration method achieves machine precision accuracy in a highly efficient and robust way, requiring no special adjustments when the orbits have large eccentricities. The stability of orbits was examined with a determination of the Renyi entropy, estimated from recurrence plots, and with a more straightforward method based on the maximum eccentricity achieved by the planet over the 1 million year integration. Additionally, the eccentricity is an indication of the habitability of a terrestrial planet in the HZ; any value of e > 0.2 produces a significant temperature difference on a planet's surface between apoapse and periapse. The results for possible stable orbits for terrestrial planets in habitable zones for the five systems are: for Gl 777 A nearly the entire HZ is stable, for 47 Uma, HD 72659 and HD 4208 terrestrial planets can survive for a sufficiently long time, while for Gl 614 our results exclude terrestrial planets moving in stable orbits within the HZ. Studies such as this one are of primary interest to future space missions dedicated to finding habitable terrestrial planets in other stellar systems. Assessing the likelihood of other habitable planets, and more generally the possibility of other life, is the central question of astrobiology today. Our investigation indicates that, from the dynamical point of view, habitable terrestrial planets seem to be compatible with many of the currently discovered extrasolar systems
Y1 - 2004
UR - http://www.aanda.org/
U6 - https://doi.org/10.1051/0004-6361:20040390
SN - 0004-6361
ER -
TY - JOUR
A1 - Brehmer, Ludwig
A1 - Hahn, M.
A1 - Seifert, M.
A1 - Wernecke, R.
A1 - Jäger, Werner
A1 - Wonnenberg, R.
A1 - Zehner, C.
T1 - Verfahren zur Herstellung eines Feuchtsensor
Y1 - 1994
ER -
TY - JOUR
A1 - Brehmer, Ludwig
A1 - Hahn, M.
A1 - Seifert, M.
A1 - Wernecke, R.
A1 - Jäger, Werner
A1 - Wonnenberg, R.
A1 - Zehner, C.
T1 - Feuchtesensor
Y1 - 1994
ER -
TY - JOUR
A1 - Teriaca, Luca
A1 - Andretta, Vincenzo
A1 - Auchere, Frederic
A1 - Brown, Charles M.
A1 - Buchlin, Eric
A1 - Cauzzi, Gianna
A1 - Culhane, J. Len
A1 - Curdt, Werner
A1 - Davila, Joseph M.
A1 - Del Zanna, Giulio
A1 - Doschek, George A.
A1 - Fineschi, Silvano
A1 - Fludra, Andrzej
A1 - Gallagher, Peter T.
A1 - Green, Lucie
A1 - Harra, Louise K.
A1 - Imada, Shinsuke
A1 - Innes, Davina
A1 - Kliem, Bernhard
A1 - Korendyke, Clarence
A1 - Mariska, John T.
A1 - Martinez-Pillet, Valentin
A1 - Parenti, Susanna
A1 - Patsourakos, Spiros
A1 - Peter, Hardi
A1 - Poletto, Luca
A1 - Rutten, Robert J.
A1 - Schuehle, Udo
A1 - Siemer, Martin
A1 - Shimizu, Toshifumi
A1 - Socas-Navarro, Hector
A1 - Solanki, Sami K.
A1 - Spadaro, Daniele
A1 - Trujillo-Bueno, Javier
A1 - Tsuneta, Saku
A1 - Dominguez, Santiago Vargas
A1 - Vial, Jean-Claude
A1 - Walsh, Robert
A1 - Warren, Harry P.
A1 - Wiegelmann, Thomas
A1 - Winter, Berend
A1 - Young, Peter
T1 - LEMUR large european module for solar ultraviolet research
JF - Experimental astronomy : an international journal on astronomical instrumentation and data analysis
N2 - The solar outer atmosphere is an extremely dynamic environment characterized by the continuous interplay between the plasma and the magnetic field that generates and permeates it. Such interactions play a fundamental role in hugely diverse astrophysical systems, but occur at scales that cannot be studied outside the solar system. Understanding this complex system requires concerted, simultaneous solar observations from the visible to the vacuum ultraviolet (VUV) and soft X-rays, at high spatial resolution (between 0.1'' and 0.3''), at high temporal resolution (on the order of 10 s, i.e., the time scale of chromospheric dynamics), with a wide temperature coverage (0.01 MK to 20 MK, from the chromosphere to the flaring corona), and the capability of measuring magnetic fields through spectropolarimetry at visible and near-infrared wavelengths. Simultaneous spectroscopic measurements sampling the entire temperature range are particularly important. These requirements are fulfilled by the Japanese Solar-C mission (Plan B), composed of a spacecraft in a geosynchronous orbit with a payload providing a significant improvement of imaging and spectropolarimetric capabilities in the UV, visible, and near-infrared with respect to what is available today and foreseen in the near future. The Large European Module for solar Ultraviolet Research (LEMUR), described in this paper, is a large VUV telescope feeding a scientific payload of high-resolution imaging spectrographs and cameras. LEMUR consists of two major components: a VUV solar telescope with a 30 cm diameter mirror and a focal length of 3.6 m, and a focal-plane package composed of VUV spectrometers covering six carefully chosen wavelength ranges between 170 and 1270 . The LEMUR slit covers 280'' on the Sun with 0.14'' per pixel sampling. In addition, LEMUR is capable of measuring mass flows velocities (line shifts) down to 2 km s (-aEuro parts per thousand 1) or better. LEMUR has been proposed to ESA as the European contribution to the Solar C mission.
KW - Sun: atmosphere
KW - Space vehicles: instruments
KW - Techniques: spectroscopy
KW - ESA cosmic vision
Y1 - 2012
U6 - https://doi.org/10.1007/s10686-011-9274-x
SN - 0922-6435
VL - 34
IS - 2
SP - 273
EP - 309
PB - Springer
CY - Dordrecht
ER -
TY - JOUR
A1 - Pablo, Herbert
A1 - Richardson, Noel D.
A1 - Moffat, Anthony F. J.
A1 - Corcoran, Michael
A1 - Shenar, Tomer
A1 - Benvenuto, Omar
A1 - Fuller, Jim
A1 - Naze, Yael
A1 - Hoffman, Jennifer L.
A1 - Miroshnichenko, Anatoly
A1 - Apellaniz, Jesus Maiz
A1 - Evans, Nancy
A1 - Eversberg, Thomas
A1 - Gayley, Ken
A1 - Gull, Ted
A1 - Hamaguchi, Kenji
A1 - Hamann, Wolf-Rainer
A1 - Henrichs, Huib
A1 - Hole, Tabetha
A1 - Ignace, Richard
A1 - Iping, Rosina
A1 - Lauer, Jennifer
A1 - Leutenegger, Maurice
A1 - Lomax, Jamie
A1 - Nichols, Joy
A1 - Oskinova, Lida M.
A1 - Owocki, Stan
A1 - Pollock, Andy
A1 - Russell, Christopher M. P.
A1 - Waldron, Wayne
A1 - Buil, Christian
A1 - Garrel, Thierry
A1 - Graham, Keith
A1 - Heathcote, Bernard
A1 - Lemoult, Thierry
A1 - Li, Dong
A1 - Mauclaire, Benjamin
A1 - Potter, Mike
A1 - Ribeiro, Jose
A1 - Matthews, Jaymie
A1 - Cameron, Chris
A1 - Guenther, David
A1 - Kuschnig, Rainer
A1 - Rowe, Jason
A1 - Rucinski, Slavek
A1 - Sasselov, Dimitar
A1 - Weiss, Werner
T1 - A coordinated X-Ray and optical campaign of the nearest massive eclipsing binary, delta ORIONIS Aa. III. Analysis of optical photometric (most) and spectroscopic (ground based) variations
JF - The astrophysical journal : an international review of spectroscopy and astronomical physics
N2 - We report on both high-precision photometry from the Microvariability and Oscillations of Stars (MOST) space telescope and ground-based spectroscopy of the triple system delta Ori A, consisting of a binary O9.5II+early-B (Aa1 and Aa2) with P = 5.7 days, and a more distant tertiary (O9 IV P > 400 years). This data was collected in concert with X-ray spectroscopy from the Chandra X-ray Observatory. Thanks to continuous coverage for three weeks, the MOST light curve reveals clear eclipses between Aa1 and Aa2 for the first time in non-phased data. From the spectroscopy, we have a well-constrained radial velocity (RV) curve of Aa1. While we are unable to recover RV variations of the secondary star, we are able to constrain several fundamental parameters of this system and determine an approximate mass of the primary using apsidal motion. We also detected second order modulations at 12 separate frequencies with spacings indicative of tidally influenced oscillations. These spacings have never been seen in a massive binary, making this system one of only a handful of such binaries that show evidence for tidally induced pulsations.
KW - binaries: close
KW - binaries: eclipsing
KW - stars: early-type
KW - stars: individual (delta Ori A)
KW - stars: mass-loss
KW - stars: variables: general
Y1 - 2015
U6 - https://doi.org/10.1088/0004-637X/809/2/134
SN - 0004-637X
SN - 1538-4357
VL - 809
IS - 2
PB - IOP Publ. Ltd.
CY - Bristol
ER -
TY - JOUR
A1 - Gossner, Martin M.
A1 - Lewinsohn, Thomas M.
A1 - Kahl, Tiemo
A1 - Grassein, Fabrice
A1 - Boch, Steffen
A1 - Prati, Daniel
A1 - Birkhofer, Klaus
A1 - Renner, Swen C.
A1 - Sikorski, Johannes
A1 - Wubet, Tesfaye
A1 - Arndt, Hartmut
A1 - Baumgartner, Vanessa
A1 - Blaser, Stefan
A1 - Blüthgen, Nico
A1 - Börschig, Carmen
A1 - Buscot, Francois
A1 - Diekötter, Tim
A1 - Jorge, Leonardo Re
A1 - Jung, Kirsten
A1 - Keyel, Alexander C.
A1 - Klein, Alexandra-Maria
A1 - Klemmer, Sandra
A1 - Krauss, Jochen
A1 - Lange, Markus
A1 - Müller, Jörg
A1 - Overmann, Jörg
A1 - Pasalic, Esther
A1 - Penone, Caterina
A1 - Perovic, David J.
A1 - Purschke, Oliver
A1 - Schall, Peter
A1 - Socher, Stephanie A.
A1 - Sonnemann, Ilja
A1 - Tschapka, Marco
A1 - Tscharntke, Teja
A1 - Türke, Manfred
A1 - Venter, Paul Christiaan
A1 - Weiner, Christiane N.
A1 - Werner, Michael
A1 - Wolters, Volkmar
A1 - Wurst, Susanne
A1 - Westphal, Catrin
A1 - Fischer, Markus
A1 - Weisser, Wolfgang W.
A1 - Allan, Eric
T1 - Land-use intensification causes multitrophic homogenization of grassland communities
JF - Nature : the international weekly journal of science
N2 - Land-use intensification is a major driver of biodiversity loss(1,2). Alongside reductions in local species diversity, biotic homogenization at larger spatial scales is of great concern for conservation. Biotic homogenization means a decrease in beta-diversity (the compositional dissimilarity between sites). Most studies have investigated losses in local (alpha)-diversity(1,3) and neglected biodiversity loss at larger spatial scales. Studies addressing beta-diversity have focused on single or a few organism groups (for example, ref. 4), and it is thus unknown whether land-use intensification homogenizes communities at different trophic levels, above-and belowground. Here we show that even moderate increases in local land-use intensity (LUI) cause biotic homogenization across microbial, plant and animal groups, both above- and belowground, and that this is largely independent of changes in alpha-diversity. We analysed a unique grassland biodiversity dataset, with abundances of more than 4,000 species belonging to 12 trophic groups. LUI, and, in particular, high mowing intensity, had consistent effects on beta-diversity across groups, causing a homogenization of soil microbial, fungal pathogen, plant and arthropod communities. These effects were nonlinear and the strongest declines in beta-diversity occurred in the transition from extensively managed to intermediate intensity grassland. LUI tended to reduce local alpha-diversity in aboveground groups, whereas the alpha-diversity increased in belowground groups. Correlations between the alpha-diversity of different groups, particularly between plants and their consumers, became weaker at high LUI. This suggests a loss of specialist species and is further evidence for biotic homogenization. The consistently negative effects of LUI on landscape-scale biodiversity underscore the high value of extensively managed grasslands for conserving multitrophic biodiversity and ecosystem service provision. Indeed, biotic homogenization rather than local diversity loss could prove to be the most substantial consequence of land-use intensification.
Y1 - 2016
U6 - https://doi.org/10.1038/nature20575
SN - 0028-0836
SN - 1476-4687
VL - 540
SP - 266
EP - +
PB - Nature Publ. Group
CY - London
ER -
TY - GEN
A1 - Jones, Eppie R.
A1 - González-Fortes, Gloria M.
A1 - Connell, Sarah
A1 - Siska, Veronika
A1 - Eriksson, Anders
A1 - Martiniano, Rui
A1 - McLaughlin, Russell L.
A1 - Llorente, Marcos Gallego
A1 - Cassidy, Lara M.
A1 - Gamba, Cristina
A1 - Meshveliani, Tengiz
A1 - Bar-Yosef, Ofer
A1 - Müller, Werner
A1 - Belfer-Cohen, Anna
A1 - Matskevich, Zinovi
A1 - Jakeli, Nino
A1 - Higham, Thomas F. G.
A1 - Currat, Mathias
A1 - Lordkipanidze, David
A1 - Hofreiter, Michael
A1 - Manica, Andrea
A1 - Pinhasi, Ron
A1 - Bradley, Daniel G.
T1 - Upper Palaeolithic genomes reveal deep roots of modern Eurasians
T2 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2 - We extend the scope of European palaeogenomics by sequencing the genomes of Late Upper Palaeolithic (13,300 years old, 1.4-fold coverage) and Mesolithic (9,700 years old, 15.4-fold) males from western Georgia in the Caucasus and a Late Upper Palaeolithic (13,700 years old, 9.5-fold) male from Switzerland. While we detect Late Palaeolithic–Mesolithic genomic continuity in both regions, we find that Caucasus hunter-gatherers (CHG) belong to a distinct ancient clade that split from western hunter-gatherers ∼45 kya, shortly after the expansion of anatomically modern humans into Europe and from the ancestors of Neolithic farmers ∼25 kya, around the Last Glacial Maximum. CHG genomes significantly contributed to the Yamnaya steppe herders who migrated into Europe ∼3,000 BC, supporting a formative Caucasus influence on this important Early Bronze age culture. CHG left their imprint on modern populations from the Caucasus and also central and south Asia possibly marking the arrival of Indo-Aryan languages.
T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1334
Y1 - 2015
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-439317
SN - 1866-8372
IS - 1334
ER -
TY - JOUR
A1 - Jones, Eppie R.
A1 - González-Fortes, Gloria M.
A1 - Connell, Sarah
A1 - Siska, Veronika
A1 - Eriksson, Anders
A1 - Martiniano, Rui
A1 - McLaughlin, Russell L.
A1 - Llorente, Marcos Gallego
A1 - Cassidy, Lara M.
A1 - Gamba, Cristina
A1 - Meshveliani, Tengiz
A1 - Bar-Yosef, Ofer
A1 - Mueller, Werner
A1 - Belfer-Cohen, Anna
A1 - Matskevich, Zinovi
A1 - Jakeli, Nino
A1 - Higham, Thomas F. G.
A1 - Currat, Mathias
A1 - Lordkipanidze, David
A1 - Hofreiter, Michael
A1 - Manica, Andrea
A1 - Pinhasi, Ron
A1 - Bradley, Daniel G.
T1 - Upper Palaeolithic genomes reveal deep roots of modern Eurasians
JF - Nature Communications
N2 - We extend the scope of European palaeogenomics by sequencing the genomes of Late Upper Palaeolithic (13,300 years old, 1.4-fold coverage) and Mesolithic (9,700 years old, 15.4-fold) males from western Georgia in the Caucasus and a Late Upper Palaeolithic (13,700 years old, 9.5-fold) male from Switzerland. While we detect Late Palaeolithic-Mesolithic genomic continuity in both regions, we find that Caucasus hunter-gatherers (CHG) belong to a distinct ancient clade that split from western hunter-gatherers similar to 45 kya, shortly after the expansion of anatomically modern humans into Europe and from the ancestors of Neolithic farmers similar to 25 kya, around the Last Glacial Maximum. CHG genomes significantly contributed to the Yamnaya steppe herders who migrated into Europe similar to 3,000 BC, supporting a formative Caucasus influence on this important Early Bronze age culture. CHG left their imprint on modern populations from the Caucasus and also central and south Asia possibly marking the arrival of Indo-Aryan languages.
Y1 - 2015
U6 - https://doi.org/10.1038/ncomms9912
SN - 2041-1723
VL - 6
PB - Nature Publishing Group
CY - London
ER -
TY - JOUR
A1 - Reindl, Nicole
A1 - Bainbridge, M.
A1 - Przybilla, Norbert
A1 - Geier, Stephan Alfred
A1 - Prvak, M.
A1 - Krticka, Jiri
A1 - Ostensen, R. H.
A1 - Telting, J.
A1 - Werner, K.
T1 - Unravelling the baffling mystery of the ultrahot wind phenomenon in white dwarfs
JF - Monthly notices of the Royal Astronomical Society
N2 - The presence of ultrahigh excitation (UHE) absorption lines (e.g. OVIII) in the optical spectra of several of the hottest white dwarfs poses a decades-long mystery and is something that has never been observed in any other astrophysical object. The occurrence of such features requires a dense environment with temperatures near 10(6) K, by far exceeding the stellar effective temperature. Here we report the discovery of a new hot wind white dwarf, GALEXJ014636.8+323615. Astonishingly, we found for the first time rapid changes of the equivalent widths of the UHE features, which are correlated to the rotational period of the star (P=0.242035 d). We explain this with the presence of a wind-fed circumstellar magnetosphere in which magnetically confined wind shocks heat up the material to the high temperatures required for the creation of the UHE lines. The photometric and spectroscopic variability of GALEXJ014636.8+323615 can then be understood as consequence of the obliquity of the magnetic axis with respect to the rotation axis of the white dwarf. This is the first time a wind-fed circumstellar magnetosphere around an apparently isolated white dwarf has been discovered and finally offers a plausible explanation of the ultrahot wind phenomenon.
KW - stars: AGB and post-AGB
KW - stars: evolution
KW - stars: magnetic field
Y1 - 2018
U6 - https://doi.org/10.1093/mnrasl/sly191
SN - 0035-8711
SN - 1365-2966
VL - 482
IS - 1
SP - L93
EP - L98
PB - Oxford Univ. Press
CY - Oxford
ER -
TY - JOUR
A1 - Hermanussen, Michael
A1 - Scheffler, Christiane
A1 - Martin, Lidia
A1 - Groth, Detlef
A1 - Waxmonsky, James G.
A1 - Swanson, James
A1 - Nowak-Szczepanska, Natalia
A1 - Gomula, Aleksandra
A1 - Apanasewicz, Anna
A1 - Konarski, Jan M.
A1 - Malina, Robert M.
A1 - Bartkowiak, Sylwia
A1 - Lebedeva, Lidia
A1 - Suchomlinov, Andrej
A1 - Konstantinov, Vsevolod
A1 - Blum, Werner
A1 - Limony, Yehuda
A1 - Chakraborty, Raja
A1 - Kirchengast, Sylvia
A1 - Tutkuviene, Janina
A1 - Jakimaviciene, Egle Marija
A1 - Cepuliene, Ramune
A1 - Franken, Daniel
A1 - Navazo, Bárbara
A1 - Moelyo, Annang G.
A1 - Satake, Takashi
A1 - Koziel, Slawomir
ED - Scheffler, Christiane
ED - Koziel, Slawomir
ED - Hermanussen, Michael
ED - Bogin, Barry
T1 - Growth, Nutrition and Economy
BT - Proceedings of the 27th Aschauer Soiree, held at Krobielowice, Poland, November 16th 2019
T2 - Human Biology and Public Health
N2 - Twenty-three scientists met at Krobielowice, Poland to discuss the role of growth, nutrition and economy on body size. Contrasting prevailing concepts, re-analyses of studies in Indonesian and Guatemalan school children with high prevalence of stunting failed to provide evidence for an association between nutritional status and body height. Direct effects of parental education on growth that were not transmitted via nutrition were shown in Indian datasets using network analysis and novel statistical methods (St. Nicolas House Analysis) that translate correlation matrices into network graphs. Data on Polish children suggest significant impact of socioeconomic sensitivity on child growth, with no effect of maternal money satisfaction. Height and maturation tempo affect the position of a child among its peers. Correlations also exist between mood disorders and height. Secular changes in height and weight varied across decades independent of population size. Historic and recent Russian data showed that height of persons whose fathers performed manual work were on average four cm shorter than persons whose fathers were high-degree specialists. Body height, menarcheal age, and body proportions are sensitive to socioeconomic variables. Additional topics included delayed motherhood and its associations with newborn size; geographic and socioeconomic indicators related to low birth weight, prematurity and stillbirth rate; data on anthropometric history of Brazil, 1850-1950; the impact of central nervous system stimulants on the growth of children with attention-deficit/hyperactivity disorder; and pituitary development and growth hormone secretion. Final discussions debated on reverse causality interfering between social position, and adolescent growth and developmental tempo.
KW - nutrition
KW - stunting
KW - socioeconomy
KW - education
KW - secular changes
KW - pubertal timing
Y1 - 2021
U6 - https://doi.org/10.52905/hbph.v1.1
SN - 2748-9957
VL - 2021
IS - 1
SP - 1
EP - 13
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Ramiaramanantsoa, Tahina
A1 - Ratnasingam, Rathish
A1 - Shenar, Tomer
A1 - Moffat, Anthony F. J.
A1 - Rogers, Tamara M.
A1 - Popowicz, Adam
A1 - Kuschnig, Rainer
A1 - Pigulski, Andrzej
A1 - Handler, Gerald
A1 - Wade, Gregg A.
A1 - Zwintz, Konstanze
A1 - Weiss, Werner W.
T1 - A BRITE view on the massive O-type supergiant V973 Scorpii
BT - hints towards internal gravity waves or sub-surface convection zones
JF - Monthly notices of the Royal Astronomical Society
N2 - Stochastically triggered photospheric light variations reaching similar to 40 mmag peak-to-valley amplitudes have been detected in the O8 Iaf supergiant V973 Scorpii as the outcome of 2 months of high-precision time-resolved photometric observations with the BRIght Target Explorer (BRITE) nanosatellites. The amplitude spectrum of the time series photometry exhibits a pronounced broad bump in the low-frequency regime (less than or similar to 0.9 d(-1)) where several prominent frequencies are detected. A time-frequency analysis of the observations reveals typical mode lifetimes of the order of 5-10 d. The overall features of the observed brightness amplitude spectrum of V973 Sco match well with those extrapolated from two-dimensional hydrodynamical simulations of convectively driven internal gravity waves randomly excited from deep in the convective cores of massive stars. An alternative or additional possible source of excitation from a sub-surface convection zone needs to be explored in future theoretical investigations.
KW - convection
KW - waves
KW - techniques: photometric
KW - stars: massive
KW - supergiants
Y1 - 2018
U6 - https://doi.org/10.1093/mnras/sty1897
SN - 0035-8711
SN - 1365-2966
VL - 480
IS - 1
SP - 972
EP - 986
PB - Oxford Univ. Press
CY - Oxford
ER -
TY - JOUR
A1 - Duydu, Yalcin
A1 - Basaran, Nursen
A1 - Aydin, Sevtap
A1 - Ustundag, Aylin
A1 - Yalcin, Can Özgür
A1 - Anlar, Hatice Gul
A1 - Bacanli, Merve
A1 - Aydos, Kaan
A1 - Atabekoglu, Cem Somer
A1 - Golka, Klaus
A1 - Ickstadt, Katja
A1 - Schwerdtle, Tanja
A1 - Werner, Matthias
A1 - Meyer, Sören
A1 - Bolt, Hermann M.
T1 - Evaluation of FSH, LH, testosterone levels and semen parameters in male boron workers under extreme exposure conditions
JF - Archives of toxicology : official journal of EUROTOX
N2 - Boric acid and sodium borates are currently classified in the EU-CLP regulation as "toxic to reproduction" under "Category 1B", with hazard statement of H360FD. However, so far field studies on male reproduction in China and in Turkey could not confirm such boron-associated toxic effects. As validation by another independent study is still required, the present study has investigated possible boron-associated effects on male reproduction in workers (n = 212) under different boron exposure conditions. The mean daily boron exposure (DBE) and blood boron concentration of workers in the extreme exposure group (n = 98) were 47.17 +/- 17.47 (7.95-106.8) mg B/day and 570.6 +/- 160.1 (402.6-1100) ng B/g blood, respectively. Nevertheless, boron-associated adverse effects on semen parameters, as well as on FSH, LH and total testosterone levels were not seen, even within the extreme exposure group. With this study, a total body of evidence has accumulated that allows to conclude that male reproductive effects are not relevant to humans, under any feasible and realistic conditions of exposure to inorganic boron compounds.
KW - Boron exposure
KW - Boric acid
KW - Reproductive toxicity
KW - FSH
KW - LH
KW - Testosterone
KW - Semen parameters
Y1 - 2018
U6 - https://doi.org/10.1007/s00204-018-2296-7
SN - 0340-5761
SN - 1432-0738
VL - 92
IS - 10
SP - 3051
EP - 3059
PB - Springer
CY - Heidelberg
ER -
TY - JOUR
A1 - Rauch, Thomas
A1 - Quinet, P.
A1 - Hoyer, D.
A1 - Werner, K.
A1 - Richter, Philipp
A1 - Kruk, J. W.
A1 - Demleitner, M.
T1 - VII. New Kr IV - VII oscillator strengths and an improved spectral analysis of the hot, hydrogen-deficient DO-type white dwarf RE 0503-289
JF - Plant physiology : an international journal devoted to physiology, biochemistry, cellular and molecular biology, biophysics and environmental biology of plants
N2 - Context. For the spectral analysis of high-resolution and high signal-to-noise (S/N) spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model atmospheres are mandatory. These are strongly dependent on the reliability of the atomic data that is used for their calculation. Aims. New Kr IV-VII oscillator strengths for a large number of lines enable us to construct more detailed model atoms for our NLTE model-atmosphere calculations. This enables us to search for additional Kr lines in observed spectra and to improve Kr abundance determinations. Methods. We calculated Kr IV-VII oscillator strengths to consider radiative and collisional bound-bound transitions in detail in our NLTE stellar-atmosphere models for the analysis of Kr lines that are exhibited in high-resolution and high S/N ultraviolet (UV) observations of the hot white dwarf RE 0503-289. Results. We reanalyzed the effective temperature and surface gravity and determined T-eff = 70 000 +/- 2000 K and log (g/cm s(-2)) = 7.5 +/- 0.1. We newly identified ten Kr V lines and one Kr vi line in the spectrum of RE 0503-289. We measured a Kr abundance of 3.3 +/- 0.3 (logarithmic mass fraction). We discovered that the interstellar absorption toward RE 0503-289 has a multi-velocity structure within a radial-velocity interval of -40 km s(-1) < upsilon(rad) < +18 km s(-1). Conclusions. Reliable measurements and calculations of atomic data are a prerequisite for state-of-the-art NLTE stellar-atmosphere modeling. Observed Kr V-VII line profiles in the UV spectrum of the white dwarf RE 0503-289 were simultaneously well reproduced with our newly calculated oscillator strengths.
KW - atomic data
KW - line: identification
KW - stars: abundances
KW - stars: individual: RE 0503-289
KW - virtual observatory tools
KW - stars: individual: RE 0457-281
Y1 - 2016
U6 - https://doi.org/10.1051/0004-6361/201628131
SN - 1432-0746
VL - 590
PB - EDP Sciences
CY - Les Ulis
ER -
TY - JOUR
A1 - Grözinger, Elvira
A1 - Jütte, Daniel
A1 - Jütte, Robert
A1 - Knufinke, Ulrich
A1 - Marquart, Susanne
A1 - Meroz, Ronit
A1 - Miller, Gabriel
A1 - Nemtsov, Jascha
A1 - Panagiotidis, Elena
A1 - Powels-Niami, Sylvia
A1 - Reininghaus, Moritz
A1 - Riemer, Nathanael
A1 - Rosenfeld, Ulrike M.
A1 - Strehlen, Martina
A1 - Voigts, Manfred
A1 - Werner, Petra
ED - Riemer, Nathanael
ED - Dubrau, Alexander
T1 - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien e.V.
N2 - Aus dem Inhalt dieser Ausgabe: Artikel und Miszellen: Sylvia Powels-Niami: Die Samaritaner, ihre Geschichte, Religion und Literatur, Ronit Meroz: Der Aufbau des Buches Sohar, Nathanael Riemer: „Der Rabbiner“ – eine vergessene Zeitschrift eines christlichen Hebraisten, Ulrich Knufinke: Jüdische Friedhofsbauten um 1800 in Deutschland : Architektur als Spiegel der Auseinandersetzungen um Haskala, „Emanzipation“ und „Assimilation“, Manfred Voigts: Die „Freie Wissenschaftliche Vereinigung“ - eine antiantisemitische Studentenverbindung, Susanne Marquardt/Petra Werner: Katalogisierung von Judaica und Hebraica am Beispiel Berlin-Brandenburger Bibliotheken Tagungen: Jüdische Identitäten in Ostmitteleuropa im 19. und 20. Jahrhundert im Wandel (Elena Panagiotidis), 700 Jahre Juden in Krakau (Elvira Grözinger), Jüdisches Archivwesen (Martina Strehlen), Geschichte und geistige Physiognomie der Veitel Heine Ephraimschen Lehranstalt Berlin (Moritz Reininghaus) Rezensionen: Un beau livre d’histoires. Eyn shön Mayse bukh (Nathanel Riemer), Juliette Guilbaud, Nicolas Le Moigne, Thomas Lüttenberg (Hrsg.): Normes culturelles et construction de la déviance (Robert Jütte), Monika Preuß, „...aber die Krone des guten Namens überragt sie.“ (Robert Jütte), Jeremy Barham (Hrsg.): Perspectives on Gustav Mahler; Philip V. Bohlman: Jüdische Volksmusik; Tina Frühauf: Orgel und Orgelmusik in deutsch-jüdischer Kultur (Daniel Jütte), „Aus Kindern wurden Briefe. Die Rettung jüdischer Kinder aus Nazi-Deutschland“. Hrsg. v. Gudrun Maierhof, Chana Schütz, Hermann Simon (Elvira Grözinger), Meike Gotham: Die Rechtsnation und ihr Staat (Gabriel Miller), Matthias N. Lorenz: „Auschwitz drängt uns auf einen Fleck“ (Elvira Grözinger) Jüdische Studien in aller Welt: Eindrücke von Forschungsreisen nach Moskau, Jerusalem und New York (Jascha Nemtsov)
T3 - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien e.V. - 11
KW - Judentum
Y1 - 2005
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-6772
SN - 978-3-939469-80-3
SN - 1862-7684
SN - 1614-6492
IS - 11
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - GEN
A1 - Bringmann, Gerhard
A1 - Mutanyatta-Comar, Joan
A1 - Maksimenka, Katja
A1 - Wanjohi, John M.
A1 - Heydenreich, Matthias
A1 - Brun, Reto
A1 - Müller, Werner E. G.
A1 - Peter, Martin
A1 - Midiwo, Jacob O.
A1 - Yenesew, Abiy
T1 - Joziknipholones A and B : the First Dimeric Phenylanthraquinones, from the Roots of Bulbine frutescens
N2 - From the roots of the African plant Bulbine frutescens (Asphodelaceae), two unprecedented novel dimeric phenylanthraquinones, named joziknipholones A and B, possessing axial and centrochirality, were isolated, together with six known compounds. Structural elucidation of the new metabolites was achieved by spectroscopic and chiroptical methods, by reductive cleavage of the central bond between the monomeric phenylanthraquinone and -anthrone portions with sodium dithionite, and by quantum chemical CD calculations. Based on the recently revised absolute axial configuration of the parent phenylanthraquinones, knipholone and knipholone anthrone, the new dimers were attributed to possess the P-configuration (i.e., with the acetyl portions below the anthraquinone plane) at both axes in the case of joziknipholone A, whereas in joziknipholone B, the knipholone part was found to be M-configured. Joziknipholones A and B are active against the chloroquine resistant strain K1 of the malaria pathogen, Plasmodium falciparum, and show moderate activity against murine leukemic lymphoma L5178y cells.
T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 104
KW - antimalarial activity
KW - chirality
KW - joziknipholones
KW - natural products
KW - structure elucidation
Y1 - 2008
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-42638
ER -
TY - JOUR
A1 - Hartmann, Bianca
A1 - Wai, Timothy
A1 - Hu, Hao
A1 - MacVicar, Thomas
A1 - Musante, Luciana
A1 - Fischer-Zirnsak, Björn
A1 - Stenzel, Werner
A1 - Gräf, Ralph
A1 - van den Heuvel, Lambert
A1 - Ropers, Hans-Hilger
A1 - Wienker, Thomas F.
A1 - Hübner, Christoph
A1 - Langer, Thomas
A1 - Kaindl, Angela M.
T1 - Homozygous YME1L1 Mutation Causes Mitochondriopathy with Optic Atrophy and Mitochondrial Network Fragmentation
JF - eLife
N2 - Mitochondriopathies often present clinically as multisystemic disorders of primarily high-energy consuming organs. Assembly, turnover, and surveillance of mitochondrial proteins are essential for mitochondrial function and a key task of AAA family members of metalloproteases. We identified a homozygous mutation in the nuclear encoded mitochondrial escape 1-like 1 gene YME1L1, member of the AAA protease family, as a cause of a novel mitochondriopathy in a consanguineous pedigree of Saudi Arabian descent. The homozygous missense mutation, located in a highly conserved region in the mitochondrial pre-sequence, inhibits cleavage of YME1L1 by the mitochondrial processing peptidase, which culminates in the rapid degradation of YME1L1 precursor protein. Impaired YME1L1 function causes a proliferation defect and mitochondrial network fragmentation due to abnormal processing of OPA1. Our results identify mutations in YME1L1 as a cause of a mitochondriopathy with optic nerve atrophy highlighting the importance of YME1L1 for mitochondrial functionality in humans.
KW - YME1L1
KW - mitochondriopathy
KW - intellectual disability
KW - optic atrophy
KW - OPA1
KW - mitochondrial fragmentation
Y1 - 2016
U6 - https://doi.org/10.7554/eLife.16078
SN - 2050-084X
VL - 5
SP - 1156
EP - 1165
PB - eLife Sciences Publications
CY - Cambridge
ER -
TY - JOUR
A1 - Simons, Nadja K.
A1 - Lewinsohn, Thomas
A1 - Bluethgen, Nico
A1 - Buscot, Francois
A1 - Boch, Steffen
A1 - Daniel, Rolf
A1 - Gossner, Martin M.
A1 - Jung, Kirsten
A1 - Kaiser, Kristin
A1 - Müller, Jörg
A1 - Prati, Daniel
A1 - Renner, Swen C.
A1 - Socher, Stephanie A.
A1 - Sonnemann, Ilja
A1 - Weiner, Christiane N.
A1 - Werner, Michael
A1 - Wubet, Tesfaye
A1 - Wurst, Susanne
A1 - Weisser, Wolfgang W.
T1 - Contrasting effects of grassland management modes on species-abundance distributions of multiple groups
JF - Agriculture, ecosystems & environment : an international journal for scientific research on the relationship of agriculture and food production to the biosphere
N2 - Intensive land use is a major cause of biodiversity loss, but most studies comparing the response of multiple taxa rely on simple diversity measures while analyses of other community attributes are only recently gaining attention. Species-abundance distributions (SADs) are a community attribute that can be used to study changes in the overall abundance structure of species groups, and whether these changes are driven by abundant or rare species. We evaluated the effect of grassland management intensity for three land-use modes (fertilization, mowing, grazing) and their combination on species richness and SADs for three belowground (arbuscular mycorrhizal fungi, prokaryotes and insect larvae) and seven aboveground groups (vascular plants, bryophytes and lichens; arthropod herbivores; arthropod pollinators; bats and birds). Three descriptors of SADs were evaluated: general shape (abundance decay rate), proportion of rare species (rarity) and proportional abundance of the commonest species (dominance). Across groups, taxonomic richness was largely unaffected by land-use intensity and only decreased with increasing mowing intensity. Of the three SAD descriptors, abundance decay rate became steeper with increasing combined land-use intensity across groups. This reflected a decrease in rarity among plants, herbivores and vertebrates. Effects of fertilization on the three descriptors were similar to the combined land-use intensity effects. Mowing intensity only affected the SAD descriptors of insect larvae and vertebrates, while grazing intensity produced a range of effects on different descriptors in distinct groups. Overall, belowground groups had more even abundance distribtitions than aboveground groups. Strong differences among aboveground groups and between above- and belowground groups indicate that no single taxonomic group can serve as an indicator for effects in other groups. In the past, the use of SADs has been hampered by concerns over theoretical models underlying specific forms of SADs. Our study shows that SAD descriptors that are not connected to a particular model are suitable to assess the effect of land use on community structure.
KW - Biodiversity
KW - Cutting frequency
KW - Management intensity
KW - Rank-abundance
KW - Species loss
KW - Rarity
Y1 - 2017
U6 - https://doi.org/10.1016/j.agee.2016.12.022
SN - 0167-8809
SN - 1873-2305
VL - 237
SP - 143
EP - 153
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Duydu, Yalcin
A1 - Basaran, Nursen
A1 - Ustundag, Aylin
A1 - Aydin, Sevtap
A1 - Yalcin, Can Ozgur
A1 - Anlar, Hatice Gul
A1 - Bacanli, Merve
A1 - Aydos, Kaan
A1 - Atabekoglu, Cem Somer
A1 - Golka, Klaus
A1 - Ickstadt, Katja
A1 - Schwerdtle, Tanja
A1 - Werner, Matthias
A1 - Meyer, Sören
A1 - Bolt, Hermann M.
T1 - Birth weights of newborns and pregnancy outcomes of environmentally boron-exposed females in Turkey
JF - Archives of toxicology : official journal of EUROTOX
N2 - Boric acid and sodium borates are currently classified as being toxic to reproduction under "Category 1B" with the hazard statement of "H360 FD" in the European CLP regulation. This has prompted studies on boron-mediated reprotoxic effects in male workers in boron mining areas and boric acid production plants. By contrast, studies on boron-mediated developmental effects in females are scarce. The present study was designed to fill this gap. Hundred and ninety nine females residing in Bandirma and Bigadic participated in this study investigating pregnancy outcomes. The participants constituted a study group covering blood boron from low (< 100 ng B/g blood, n = 143) to high (> 150 ng B/g blood, n = 27) concentrations. The mean blood boron concentration and the mean estimated daily boron exposure of the high exposure group was 274.58 (151.81-975.66) ng B/g blood and 24.67 (10.47-57.86) mg B/day, respectively. In spite of the high level of daily boron exposure, boron-mediated adverse effects on induced abortion, spontaneous abortion (miscarriage), stillbirth, infant death, neonatal death, early neonatal death, preterm birth, congenital anomalies, sex ratio and birth weight of newborns were not observed.
KW - Boric acid
KW - Boron exposure
KW - Biological monitoring
KW - Developmental toxicity
KW - Pregnancy outcomes
Y1 - 2018
U6 - https://doi.org/10.1007/s00204-018-2238-4
SN - 0340-5761
SN - 1432-0738
VL - 92
IS - 8
SP - 2475
EP - 2485
PB - Springer
CY - Heidelberg
ER -
TY - JOUR
A1 - Basaran, Nursen
A1 - Duydu, Yalcin
A1 - Ustundag, Aylin
A1 - Taner, Gokce
A1 - Aydin, Sevtap
A1 - Anlar, Hatice Gul
A1 - Yalcin, Can Özgür
A1 - Bacanli, Merve
A1 - Aydos, Kaan
A1 - Atabekoglu, Cem Somer
A1 - Golka, Klaus
A1 - Ickstadt, Katja
A1 - Schwerdtle, Tanja
A1 - Werner, Matthias
A1 - Meyer, Sören
A1 - Bolt, Hermann M.
T1 - Evaluation of the DNA damage in lymphocytes, sperm and buccal cells of workers under environmental and occupational boron exposure conditions
JF - Mutation Research/Genetic Toxicology and Environmental Mutagenesis
N2 - Industrial production and use of boron compounds have increased during the last decades, especially for the manufacture of borosilicate glass, fiberglass, metal alloys and flame retardants. This study was conducted in two districts of Balikesir; Bandirma and Bigadic, which geographically belong to the Marmara Region of Turkey. Bandirma is the production and exportation zone for the produced boric acid and some borates and Bigadic has the largest B deposits in Turkey. 102 male workers who were occupationally exposed to boron from Bandirma and 110 workers who were occupationally and environmentally exposed to boron from Bigadic participated to our study. In this study the DNA damage in the sperm, blood and buccal cells of 212 males was evaluated by comet and micronucleus assays. No significant increase in the DNA damage in blood, sperm and buccal cells was observed in the residents exposed to boron both occupationally and environmentally (p = 0.861) for Comet test in the sperm samples, p = 0.116 for Comet test in the lymphocyte samples, p = 0.042 for micronucleus (MN) test, p = 0.955 for binucleated cells (BN), p = 1.486 for condensed chromatin (CC), p = 0.455 for karyorrhectic cells (KHC), p = 0.541 for karyolitic cells (KLY), p = 1.057 for pyknotic cells (PHC), p = 0.331 for nuclear bud (NBUD)). No correlations were seen between blood boron levels and tail intensity values of the sperm samples, lymphocyte samples, frequencies of MN, BN, KHC, KYL, PHC and NBUD. The results of this study came to the same conclusions of the previous studies that boron does not induce DNA damage even under extreme exposure conditions.
KW - Boric acid
KW - Boron exposure
KW - DNA damage
KW - Comet assay
Y1 - 2019
U6 - https://doi.org/10.1016/j.mrgentox.2018.12.013
SN - 1383-5718
SN - 1879-3592
VL - 843
SP - 33
EP - 39
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Duydu, Yalcin
A1 - Basaran, Nursen
A1 - Yalcin, Can Özgür
A1 - Ustundag, Aylin
A1 - Aydin, Sevtap
A1 - Anlar, Hatice Gul
A1 - Bacanli, Merve
A1 - Aydos, Kaan
A1 - Atabekoglu, Cem Somer
A1 - Golka, Klaus
A1 - Ickstadt, Katja
A1 - Schwerdtle, Tanja
A1 - Werner, Matthias
A1 - Bolt, Hermann M.
T1 - Boron-exposed male workers in Turkey
BT - no change in sperm Y:X chromosome ratio and in offspring's sex ratio
JF - Archives of toxicology : official journal of EUROTOX
N2 - Boron-associated shifts in sex ratios at birth were suggested earlier and attributed to a decrease in Y- vs. X-bearing sperm cells. As the matter is pivotal in the discussion of reproductive toxicity of boron/borates, re-investigation in a highly borate-exposed population was required. In the present study, 304 male workers in Bandirma and Bigadic (Turkey) with different degrees of occupational and environmental exposure to boron were investigated. Boron was quantified in blood, urine and semen, and the persons were allocated to exposure groups along B blood levels. In the highest ("extreme") exposure group (n = 69), calculated mean daily boron exposures, semen boron and blood boron concentrations were 44.91 +/- 18.32 mg B/day, 1643.23 +/- 965.44 ng B/g semen and 553.83 +/- 149.52 ng B/g blood, respectively. Overall, an association between boron exposure and Y:X sperm ratios in semen was not statistically significant (p > 0.05). Also, the mean Y:X sperm ratios in semen samples of workers allocated to the different exposure groups were statistically not different in pairwise comparisons (p > 0.05). Additionally, a boron-associated shift in sex ratio at birth towards female offspring was not visible. In essence, the present results do not support an association between boron exposure and decreased Y:X sperm ratio in males, even under extreme boron exposure conditions.
KW - Paternal exposure
KW - Boron exposure
KW - Y:X chromosome ratio
KW - Sex ratio at birth
Y1 - 2019
U6 - https://doi.org/10.1007/s00204-019-02391-z
SN - 0340-5761
SN - 1432-0738
VL - 93
IS - 3
SP - 743
EP - 751
PB - Springer
CY - Heidelberg
ER -
TY - JOUR
A1 - Bringmann, Gerhard
A1 - Mutanyatta-Comar, Joan
A1 - Maksimenka, Katja
A1 - Wanjohi, John M.
A1 - Heydenreich, Matthias
A1 - Brun, Reto
A1 - Müller, Werner E. G.
A1 - Peter, Martin G.
A1 - Midiwo, Jacob O.
A1 - Yenesew, Abiy
T1 - Joziknipholones A and B : the first dimeric phenylanthraquinones, from the roots of Bulbine frutescens
N2 - From the roots of the African plant Bulbine frutescens (Asphodelaceae), two unprecedented novel dimeric phenylanthraquinones, named joziknipholones A and B, possessing axial and centrochirality, were isolated, together with six known compounds. Structural elucidation of the new metabolites was achieved by spectroscopic and chiroptical methods, by reductive cleavage of the central bond between the monomeric phenylanthraquinone and -anthrone portions with sodium dithionite, and by quantum chemical CD calculations. Based on the recently revised absolute axial configuration of the parent phenylanthraquinones, knipholone and knipholone anthrone, the new dimers were attributed to possess the P- configuration (i.e., with the acetyl portions below the anthraquinone plane) at both axes in the case of joziknipholone A, whereas in joziknipholone B, the knipholone part was found to be M-configured. Joziknipholones A and B are active against the chloroquine resistant strain K1 of the malaria pathogen, Plasmodium falciparum, and show moderate activity against murine leukemic lymphoma L5178y cells.
Y1 - 2008
UR - http://www3.interscience.wiley.com/journal/26293/home?CRETRY=1&SRETRY=0
SN - 0947-6539
ER -
TY - JOUR
A1 - Werner, Klaus
A1 - Dreizler, S.
A1 - Pakull, M. W.
A1 - Cowley, A. P.
A1 - Schmidtke, P. C.
A1 - Hutchings, J. B.
A1 - Crampton, D.
T1 - Non-LTE model atmosphere analysis of the supersoft X-ray source RX J0122.9-7521
Y1 - 1996
ER -
TY - JOUR
A1 - Kliegl, Reinhold
A1 - Dambacher, Michael
A1 - Dimigen, Olaf
A1 - Jacobs, Arthur M.
A1 - Sommer, Werner
T1 - Eye movements and brain electric potentials during reading
JF - Psychological research : an international journal of perception, attention, memory, and action
N2 - The development of theories and computational models of reading requires an understanding of processing constraints, in particular of timelines related to word recognition and oculomotor control. Timelines of word recognition are usually determined with event-related potentials (ERPs) recorded under conditions of serial visual presentation (SVP) of words; timelines of oculomotor control are derived from parameters of eye movements (EMs) during natural reading. We describe two strategies to integrate these approaches. One is to collect ERPs and EMs in separate SVP and natural reading experiments for the same experimental material (but different subjects). The other strategy is to co-register EMs and ERPs during natural reading from the same subjects. Both strategies yield data that allow us to determine how lexical properties influence ERPs (e.g., the N400 component) and EMs (e.g., fixation durations) across neighboring words. We review our recent research on the effects of frequency and predictability of words on both EM and ERP measures with reference to current models of eye-movement control during reading. Results are in support of the proposition that lexical access is distributed across several fixations and across brain-electric potentials measured on neighboring words.
Y1 - 2012
U6 - https://doi.org/10.1007/s00426-011-0376-x
SN - 0340-0727
VL - 76
IS - 2
SP - 145
EP - 158
PB - Springer
CY - Heidelberg
ER -
TY - JOUR
A1 - Pollatos, Olga
A1 - Werner, Natalie S.
A1 - Duschek, Stefan
A1 - Schandry, Rainer
A1 - Matthias, Ellen
A1 - Traut-Mattausch, Eva
A1 - Herbert, Beate M.
T1 - Differential effects of alexithymia subscales on autonomic reactivity and anxiety during social stress
JF - Journal of psychosomatic research
N2 - Objectives: Alexithymia is characterized by a difficulty in identifying and describing one's emotions. Recent research has associated differential effects of the alexithymia facets to hypothalamic pituitary adrenal (HPA) axis markers during stress. This study aimed to analyze how the facets of alexithymia interact with autonomic reactivity as well as self- and observer-rated anxiety during a social stress task. Methods: With the use of a public-speaking paradigm, skin conductance levels (SCLs) and heart rate (HR) during the defined periods of baseline, preparation, stress, and recovery were assessed in 60 volunteers (42 females, mean age 22.8) categorized as having either high (HDA) or low (LDA) degrees of alexithymia. Results: We found smaller SCLs during preparation and speech in the HDA group. Regression analyses indicated that only the alexithymia facet "difficulty in describing feelings" (DDF) was associated with smaller electrodermal responses. In the HDA group, self- and observer-rated anxiety was higher in the HDA than in the LDA group, which was attributable to higher scores in the subscales "difficulty in identifying feelings" (DIF) and "externally oriented thinking" (EOT). Conclusions: Our data support and specify the decoupling hypothesis of alexithymia by showing that the facets of alexithymia are differentially related to autonomic reactivity as well as self- and observer-rated anxiety during social stress.
KW - Alexithymia
KW - Autonomic response
KW - Social stress
KW - Skin conductance
KW - Anxiety
KW - Social performance
KW - Decoupling hypothesis
Y1 - 2011
U6 - https://doi.org/10.1016/j.jpsychores.2010.12.003
SN - 0022-3999
VL - 70
IS - 6
SP - 525
EP - 533
PB - Elsevier
CY - Oxford
ER -
TY - JOUR
A1 - Allan, Eric
A1 - Bossdorf, Oliver
A1 - Dormann, Carsten F.
A1 - Prati, Daniel
A1 - Gossner, Martin M.
A1 - Tscharntke, Teja
A1 - Blüthgen, Nico
A1 - Bellach, Michaela
A1 - Birkhofer, Klaus
A1 - Boch, Steffen
A1 - Böhm, Stefan
A1 - Börschig, Carmen
A1 - Chatzinotas, Antonis
A1 - Christ, Sabina
A1 - Daniel, Rolf
A1 - Diekötter, Tim
A1 - Fischer, Christiane
A1 - Friedl, Thomas
A1 - Glaser, Karin
A1 - Hallmann, Christine
A1 - Hodac, Ladislav
A1 - Hölzel, Norbert
A1 - Jung, Kirsten
A1 - Klein, Alexandra Maria
A1 - Klaus, Valentin H.
A1 - Kleinebecker, Till
A1 - Krauss, Jochen
A1 - Lange, Markus
A1 - Morris, E. Kathryn
A1 - Müller, Jörg
A1 - Nacke, Heiko
A1 - Pasalic, Esther
A1 - Rillig, Matthias C.
A1 - Rothenwoehrer, Christoph
A1 - Schally, Peter
A1 - Scherber, Christoph
A1 - Schulze, Waltraud X.
A1 - Socher, Stephanie A.
A1 - Steckel, Juliane
A1 - Steffan-Dewenter, Ingolf
A1 - Türke, Manfred
A1 - Weiner, Christiane N.
A1 - Werner, Michael
A1 - Westphal, Catrin
A1 - Wolters, Volkmar
A1 - Wubet, Tesfaye
A1 - Gockel, Sonja
A1 - Gorke, Martin
A1 - Hemp, Andreas
A1 - Renner, Swen C.
A1 - Schöning, Ingo
A1 - Pfeiffer, Simone
A1 - König-Ries, Birgitta
A1 - Buscot, Francois
A1 - Linsenmair, Karl Eduard
A1 - Schulze, Ernst-Detlef
A1 - Weisser, Wolfgang W.
A1 - Fischer, Markus
T1 - Interannual variation in land-use intensity enhances grassland multidiversity
JF - Proceedings of the National Academy of Sciences of the United States of America
N2 - Although temporal heterogeneity is a well-accepted driver of biodiversity, effects of interannual variation in land-use intensity (LUI) have not been addressed yet. Additionally, responses to land use can differ greatly among different organisms; therefore, overall effects of land-use on total local biodiversity are hardly known. To test for effects of LUI (quantified as the combined intensity of fertilization, grazing, and mowing) and interannual variation in LUI (SD in LUI across time), we introduce a unique measure of whole-ecosystem biodiversity, multidiversity. This synthesizes individual diversity measures across up to 49 taxonomic groups of plants, animals, fungi, and bacteria from 150 grasslands. Multidiversity declined with increasing LUI among grasslands, particularly for rarer species and aboveground organisms, whereas common species and belowground groups were less sensitive. However, a high level of interannual variation in LUI increased overall multidiversity at low LUI and was even more beneficial for rarer species because it slowed the rate at which the multidiversity of rare species declined with increasing LUI. In more intensively managed grasslands, the diversity of rarer species was, on average, 18% of the maximum diversity across all grasslands when LUI was static over time but increased to 31% of the maximum when LUI changed maximally over time. In addition to decreasing overall LUI, we suggest varying LUI across years as a complementary strategy to promote biodiversity conservation.
KW - biodiversity loss
KW - agricultural grasslands
KW - Biodiversity Exploratories
Y1 - 2014
U6 - https://doi.org/10.1073/pnas.1312213111
SN - 0027-8424
VL - 111
IS - 1
SP - 308
EP - 313
PB - National Acad. of Sciences
CY - Washington
ER -
TY - JOUR
A1 - Manning, Pete
A1 - Gossner, Martin M.
A1 - Bossdorf, Oliver
A1 - Allan, Eric
A1 - Zhang, Yuan-Ye
A1 - Prati, Daniel
A1 - Blüthgen, Nico
A1 - Boch, Steffen
A1 - Böhm, Stefan
A1 - Börschig, Carmen
A1 - Hölzel, Norbert
A1 - Jung, Kirsten
A1 - Klaus, Valentin H.
A1 - Klein, Alexandra Maria
A1 - Kleinebecker, Till
A1 - Krauss, Jochen
A1 - Lange, Markus
A1 - Müller, Jörg
A1 - Pasalic, Esther
A1 - Socher, Stephanie A.
A1 - Tschapka, Marco
A1 - Türke, Manfred
A1 - Weiner, Christiane
A1 - Werner, Michael
A1 - Gockel, Sonja
A1 - Hemp, Andreas
A1 - Renner, Swen C.
A1 - Wells, Konstans
A1 - Buscot, Francois
A1 - Kalko, Elisabeth K. V.
A1 - Linsenmair, Karl Eduard
A1 - Weisser, Wolfgang W.
A1 - Fischer, Markus
T1 - Grassland management intensification weakens the associations among the diversities of multiple plant and animal taxa
JF - Ecology : a publication of the Ecological Society of America
N2 - Land-use intensification is a key driver of biodiversity change. However, little is known about how it alters relationships between the diversities of different taxonomic groups, which are often correlated due to shared environmental drivers and trophic interactions. Using data from 150 grassland sites, we examined how land-use intensification (increased fertilization, higher livestock densities, and increased mowing frequency) altered correlations between the species richness of 15 plant, invertebrate, and vertebrate taxa. We found that 54% of pairwise correlations between taxonomic groups were significant and positive among all grasslands, while only one was negative. Higher land-use intensity substantially weakened these correlations(35% decrease in rand 43% fewer significant pairwise correlations at high intensity), a pattern which may emerge as a result of biodiversity declines and the breakdown of specialized relationships in these conditions. Nevertheless, some groups (Coleoptera, Heteroptera, Hymenoptera and Orthoptera) were consistently correlated with multidiversity, an aggregate measure of total biodiversity comprised of the standardized diversities of multiple taxa, at both high and lowland-use intensity. The form of intensification was also important; increased fertilization and mowing frequency typically weakened plant-plant and plant-primary consumer correlations, whereas grazing intensification did not. This may reflect decreased habitat heterogeneity under mowing and fertilization and increased habitat heterogeneity under grazing. While these results urge caution in using certain taxonomic groups to monitor impacts of agricultural management on biodiversity, they also suggest that the diversities of some groups are reasonably robust indicators of total biodiversity across a range of conditions.
KW - Biodiversity indicators
KW - correlation
KW - fertilization
KW - grassland management
KW - grazing
KW - land-use change
KW - land-use intensity
KW - mowing
KW - multidiversity
KW - multitrophic interactions
Y1 - 2015
U6 - https://doi.org/10.1890/14-1307.1
SN - 0012-9658
SN - 1939-9170
VL - 96
IS - 6
SP - 1492
EP - 1501
PB - Wiley
CY - Washington
ER -
TY - JOUR
A1 - Reza, M. Toufiq
A1 - Rottler, Erwin
A1 - Tölle, Rainer
A1 - Werner, Maja
A1 - Ramm, Patrice
A1 - Mumme, Jan
T1 - Production, characterization, and biogas application of magnetic hydrochar from cellulose
JF - Bioresource technology : biomass, bioenergy, biowastes, conversion technologies, biotransformation, production technologies
N2 - Hydrothermal carbonization (HTC) produces carbon-rich nano-micro size particles. In this study, magnetic hydrochar (MHC) was prepared from model compound cellulose by simply adding ferrites during HTC. The effects of ferrites on HTC were evaluated by characterizing solid MHC and corresponding process liquid. Additionally, magnetic stability of MHC was tested by magnetic susceptibility method. Finally, MHC was used as support media for anaerobic films in anaerobic digestion (AD). Ash-free mass yield was around 50% less in MHC than hydrochar produced without ferrites at any certain HTC reaction condition, where organic part of MHC is mainly carbon. In fact, amorphous hydrochar was growing on the surface of inorganic ferrites. MHC maintained magnetic susceptibility regardless of reaction time at reaction temperature 250 degrees C. Pronounced inhibitory effects of magnetic hydrochar occurred during start-up of AD but diminished with prolong AD times. Visible biofilms were observed on the MHC by laser scanning microscope after AD. (C) 2015 Elsevier Ltd. All rights reserved.
KW - Cellulose
KW - Hydrothermal carbonization
KW - Magnetic hydrochar
KW - Magnetic susceptibility
KW - Anaerobic digestion
Y1 - 2015
U6 - https://doi.org/10.1016/j.biortech.2015.03.044
SN - 0960-8524
SN - 1873-2976
VL - 186
SP - 34
EP - 43
PB - Elsevier
CY - Oxford
ER -
TY - JOUR
A1 - Dimigen, Olaf
A1 - Sommer, Werner
A1 - Hohlfeld, Annette
A1 - Jacobs, Arthur M.
A1 - Kliegl, Reinhold
T1 - Coregistration of eye movements and EEG in natural reading analyses and review
JF - Journal of experimental psychology : General
N2 - Brain-electric correlates of reading have traditionally been studied with word-by-word presentation, a condition that eliminates important aspects of the normal reading process and precludes direct comparisons between neural activity and oculomotor behavior. In the present study, we investigated effects of word predictability on eye movements (EM) and fixation-related brain potentials (FRPs) during natural sentence reading. Electroencephalogram (EEG) and EM (via video-based eye tracking) were recorded simultaneously while subjects read heterogeneous German sentences, moving their eyes freely over the text. FRPs were time-locked to first-pass reading fixations and analyzed according to the cloze probability of the currently fixated word. We replicated robust effects of word predictability on EMs and the N400 component in FRPs. The data were then used to model the relation among fixation duration, gaze duration, and N400 amplitude, and to trace the time course of EEG effects relative to effects in EM behavior. In an extended Methodological Discussion section, we review 4 technical and data-analytical problems that need to be addressed when FRPs are recorded in free-viewing situations (such as reading, visual search, or scene perception) and propose solutions. Results suggest that EEG recordings during normal vision are feasible and useful to consolidate findings from EEG and eye-tracking studies.
KW - EEG
KW - eye tracking
KW - fixation-related potentials
KW - artifact correction
KW - natural viewing
Y1 - 2011
U6 - https://doi.org/10.1037/a0023885
SN - 0096-3445
VL - 140
IS - 4
SP - 552
EP - 572
PB - American Psychological Association
CY - Washington
ER -
TY - JOUR
A1 - Bussian, Bernd M.
A1 - Pandelova, Marchela
A1 - Lehnik-Habrink, Petra
A1 - Aichner, Bernhard
A1 - Henkelmann, Bernhard
A1 - Schramm, Karl-Werner
T1 - Persistent endosulfan sulfate is found with highest abundance among endosulfan I, II, and sulfate in German forest soils
JF - Environmental pollution
N2 - Endosulfan - an agricultural insecticide and banned by Stockholm Convention - is produced as a 2:1 to 7:3 mixture of isomers endosulfan I (ESI) and endosulfan II (ESII). Endosulfan is transformed under aerobic conditions into endosulfan sulfate (ESS). The study shows for 76 sampling locations in German forests that endosulfan is abundant in all samples with an opposite ratio between the ESI and ESII than the technical product, where the main metabolite ESS is found with even higher abundance. The ratio between ESI/ESII and ESS show clear dependence on the type of stands (coniferous vs. deciduous) and humus type and increases from deciduous via mixed to coniferous forest stands. The study argues for a systematic monitoring of ESI, ESII, and ESS and underlines the need for further research, specifically on the fate of endosulfan including biomagnifications and bioaccumulation in soil. (C) 2015 Elsevier Ltd. All rights reserved.
KW - Endosulfan
KW - Stockholm-convention
KW - Diffuse pollution
KW - Soil monitoring
KW - Forest soils
Y1 - 2015
U6 - https://doi.org/10.1016/j.envpol.2015.08.023
SN - 0269-7491
SN - 1873-6424
VL - 206
SP - 661
EP - 666
PB - Elsevier
CY - Oxford
ER -
TY - GEN
A1 - Rolinski, Susanne
A1 - Rammig, Anja
A1 - Walz, Ariane
A1 - von Bloh, Werner
A1 - van Oijen, M.
A1 - Thonicke, Kirsten
T1 - A probabilistic risk assessment for the vulnerability of the European carbon cycle to weather extremes
BT - The ecosystem perspective
T2 - Postprints der Universität Potsdam : Mathematisch naturwissenschaftliche Reihe (487)
N2 - Extreme weather events are likely to occur more often under climate change and the resulting effects on ecosystems could lead to a further acceleration of climate change. But not all extreme weather events lead to extreme ecosystem response. Here, we focus on hazardous ecosystem behaviour and identify coinciding weather conditions. We use a simple probabilistic risk assessment based on time series of ecosystem behaviour and climate conditions. Given the risk assessment terminology, vulnerability and risk for the previously defined hazard are estimated on the basis of observed hazardous ecosystem behaviour.
We apply this approach to extreme responses of terrestrial ecosystems to drought, defining the hazard as a negative net biome productivity over a 12-month period. We show an application for two selected sites using data for 1981-2010 and then apply the method to the pan-European scale for the same period, based on numerical modelling results (LPJmL for ecosystem behaviour; ERA-Interim data for climate).
Our site-specific results demonstrate the applicability of the proposed method, using the SPEI to describe the climate condition. The site in Spain provides an example of vulnerability to drought because the expected value of the SPEI is 0.4 lower for hazardous than for non-hazardous ecosystem behaviour. In northern Germany, on the contrary, the site is not vulnerable to drought because the SPEI expectation values imply wetter conditions in the hazard case than in the non-hazard case.
At the pan-European scale, ecosystem vulnerability to drought is calculated in the Mediterranean and temperate region, whereas Scandinavian ecosystems are vulnerable under conditions without water shortages. These first model- based applications indicate the conceptual advantages of the proposed method by focusing on the identification of critical weather conditions for which we observe hazardous ecosystem behaviour in the analysed data set. Application of the method to empirical time series and to future climate would be important next steps to test the approach.
T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 487
KW - global vegetation model
KW - climate extremes
KW - fire emissions
KW - drought
KW - forest
KW - productivity
KW - reduction
KW - events
KW - assimilation
KW - uncertainty
Y1 - 2018
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-407999
SN - 1866-8372
IS - 487
SP - 1813
EP - 1831
ER -
TY - JOUR
A1 - Soliveres, Santiago
A1 - van der Plas, Fons
A1 - Manning, Peter
A1 - Prati, Daniel
A1 - Gossner, Martin M.
A1 - Renner, Swen C.
A1 - Alt, Fabian
A1 - Arndt, Hartmut
A1 - Baumgartner, Vanessa
A1 - Binkenstein, Julia
A1 - Birkhofer, Klaus
A1 - Blaser, Stefan
A1 - Blüthgen, Nico
A1 - Boch, Steffen
A1 - Böhm, Stefan
A1 - Börschig, Carmen
A1 - Buscot, Francois
A1 - Diekötter, Tim
A1 - Heinze, Johannes
A1 - Hölzel, Norbert
A1 - Jung, Kirsten
A1 - Klaus, Valentin H.
A1 - Kleinebecker, Till
A1 - Klemmer, Sandra
A1 - Krauss, Jochen
A1 - Lange, Markus
A1 - Morris, E. Kathryn
A1 - Müller, Jörg
A1 - Oelmann, Yvonne
A1 - Overmann, Jörg
A1 - Pasalic, Esther
A1 - Rillig, Matthias C.
A1 - Schaefer, H. Martin
A1 - Schloter, Michael
A1 - Schmitt, Barbara
A1 - Schöning, Ingo
A1 - Schrumpf, Marion
A1 - Sikorski, Johannes
A1 - Socher, Stephanie A.
A1 - Solly, Emily F.
A1 - Sonnemann, Ilja
A1 - Sorkau, Elisabeth
A1 - Steckel, Juliane
A1 - Steffan-Dewenter, Ingolf
A1 - Stempfhuber, Barbara
A1 - Tschapka, Marco
A1 - Türke, Manfred
A1 - Venter, Paul C.
A1 - Weiner, Christiane N.
A1 - Weisser, Wolfgang W.
A1 - Werner, Michael
A1 - Westphal, Catrin
A1 - Wilcke, Wolfgang
A1 - Wolters, Volkmar
A1 - Wubet, Tesfaye
A1 - Wurst, Susanne
A1 - Fischer, Markus
A1 - Allan, Eric
T1 - Biodiversity at multiple trophic levels is needed for ecosystem multifunctionality
JF - Nature : the international weekly journal of science
Y1 - 2016
U6 - https://doi.org/10.1038/nature19092
SN - 0028-0836
SN - 1476-4687
VL - 536
SP - 456
EP - +
PB - Nature Publ. Group
CY - London
ER -
TY - JOUR
A1 - Soliveres, Santiago
A1 - Manning, Peter
A1 - Prati, Daniel
A1 - Gossner, Martin M.
A1 - Alt, Fabian
A1 - Arndt, Hartmut
A1 - Baumgartner, Vanessa
A1 - Binkenstein, Julia
A1 - Birkhofer, Klaus
A1 - Blaser, Stefan
A1 - Bluethgen, Nico
A1 - Boch, Steffen
A1 - Boehm, Stefan
A1 - Boerschig, Carmen
A1 - Buscot, Francois
A1 - Diekoetter, Tim
A1 - Heinze, Johannes
A1 - Hoelzel, Norbert
A1 - Jung, Kirsten
A1 - Klaus, Valentin H.
A1 - Klein, Alexandra-Maria
A1 - Kleinebecker, Till
A1 - Klemmer, Sandra
A1 - Krauss, Jochen
A1 - Lange, Markus
A1 - Morris, E. Kathryn
A1 - Mueller, Joerg
A1 - Oelmann, Yvonne
A1 - Overmann, Jörg
A1 - Pasalic, Esther
A1 - Renner, Swen C.
A1 - Rillig, Matthias C.
A1 - Schaefer, H. Martin
A1 - Schloter, Michael
A1 - Schmitt, Barbara
A1 - Schoening, Ingo
A1 - Schrumpf, Marion
A1 - Sikorski, Johannes
A1 - Socher, Stephanie A.
A1 - Solly, Emily F.
A1 - Sonnemann, Ilja
A1 - Sorkau, Elisabeth
A1 - Steckel, Juliane
A1 - Steffan-Dewenter, Ingolf
A1 - Stempfhuber, Barbara
A1 - Tschapka, Marco
A1 - Tuerke, Manfred
A1 - Venter, Paul
A1 - Weiner, Christiane N.
A1 - Weisser, Wolfgang W.
A1 - Werner, Michael
A1 - Westphal, Catrin
A1 - Wilcke, Wolfgang
A1 - Wolters, Volkmar
A1 - Wubet, Tesfaye
A1 - Wurst, Susanne
A1 - Fischer, Markus
A1 - Allan, Eric
T1 - Locally rare species influence grassland ecosystem multifunctionality
JF - Philosophical transactions of the Royal Society of London : B, Biological sciences
N2 - Species diversity promotes the delivery of multiple ecosystem functions (multifunctionality). However, the relative functional importance of rare and common species in driving the biodiversity multifunctionality relationship remains unknown. We studied the relationship between the diversity of rare and common species (according to their local abundances and across nine different trophic groups), and multifunctionality indices derived from 14 ecosystem functions on 150 grasslands across a land use intensity (LUI) gradient. The diversity of above- and below-ground rare species had opposite effects, with rare above-ground species being associated with high levels of multifunctionality, probably because their effects on different functions did not trade off against each other. Conversely, common species were only related to average, not high, levels of multifunctionality, and their functional effects declined with LUI. Apart from the community level effects of diversity, we found significant positive associations between the abundance of individual species and multifunctionality in 6% of the species tested. Species specific functional effects were best predicted by their response to LUI: species that declined in abundance with land use intensification were those associated with higher levels of multifunctionality. Our results highlight the importance of rare species for ecosystem multifunctionality and help guiding future conservation priorities.
KW - biodiversity
KW - common species
KW - ecosystem function
KW - identity hypothesis
KW - land use
KW - multitrophic
Y1 - 2016
U6 - https://doi.org/10.1098/rstb.2015.0269
SN - 0962-8436
SN - 1471-2970
VL - 371
SP - 3175
EP - 3185
PB - Royal Society
CY - London
ER -
TY - JOUR
A1 - Iryu, Yasufumi
A1 - Matsuda, Hiroki
A1 - Machiyama, Hideaki
A1 - Piller, Werner E.
A1 - Quinn, Terrence M.
A1 - Mutti, Maria
T1 - Introductory perspective on the COREF project
JF - The island arc : official journal of the Geological Society of Japan
N2 - Coral reefs are tropic to subtropic, coastal ecosystems comprising very diverse organisms. Late Quaternary reef deposits are fossil archives of environmental, tectonic and eustatic variations that can be used to reconstruct the paleoclimatic and paleoceano-graphic history of the tropic surface oceans. Reefs located at the latitudinal limits of coral-reef ecosystems (i.e. those at coral-reef fronts) are particularly sensitive to environmental changes-especially those associated with glacial-interglacial changes in climate and sealevel. We propose a land and ocean scientific drilling campaign in the Ryukyu Islands (the Ryukyus) in the northwestern Pacific Ocean to investigate the dynamic response of the corals and coral-reef ecosystems in this region to Late Quaternary climate and sealevel change. Such a drilling campaign, which we call the COREF (coral-reef front) Project, will allow the following three major questions to be evaluated: (i) What are the nature, magnitude and driving mechanisms of coral-reef front migration in the Ryukyus? (ii) What is the ecosystem response of coral reefs in the Ryukyus to Quaternary climate changes? (iii) What is the role of coral reefs in the global carbon cycle? Subsidiary objectives include (i) the timing of coral-reef initiation in the Ryukyus and its causes; (ii) the position of the Kuroshio current during glacial periods and its effects on coral-reef formation; and (iii) early carbonate diagenetic responses as a function of compounded variations in climate, eustacy and depositional mineralogies (subtropic aragonitic to warm-temperate calcitic). The geographic, climatic and oceanographic settings of the Ryukyu Islands provide an ideal natural laboratory to address each of these research questions.
KW - coral
KW - Integrated Ocean Drilling Program
KW - International Continental Scientific Drilling Program
KW - limestone
KW - Quaternary
KW - reef
KW - Ryukyu Group
KW - Ryukyu Islands
KW - sealevel
Y1 - 2006
U6 - https://doi.org/10.1111/j.1440-1738.2006.00537.x
SN - 1038-4871
VL - 15
IS - 4
SP - 393
EP - 406
PB - Wiley-Blackwell
CY - Oxford
ER -
TY - JOUR
A1 - Rolinski, Susanne
A1 - Rammig, A.
A1 - Walz, Ariane
A1 - von Bloh, Werner
A1 - van Oijen, M.
A1 - Thonicke, Kirsten
T1 - A probabilistic risk assessment for the vulnerability of the European carbon cycle to weather extremes: the ecosystem perspective
JF - Biogeosciences
N2 - Extreme weather events are likely to occur more often under climate change and the resulting effects on ecosystems could lead to a further acceleration of climate change. But not all extreme weather events lead to extreme ecosystem response. Here, we focus on hazardous ecosystem behaviour and identify coinciding weather conditions. We use a simple probabilistic risk assessment based on time series of ecosystem behaviour and climate conditions. Given the risk assessment terminology, vulnerability and risk for the previously defined hazard are estimated on the basis of observed hazardous ecosystem behaviour.
We apply this approach to extreme responses of terrestrial ecosystems to drought, defining the hazard as a negative net biome productivity over a 12-month period. We show an application for two selected sites using data for 1981-2010 and then apply the method to the pan-European scale for the same period, based on numerical modelling results (LPJmL for ecosystem behaviour; ERA-Interim data for climate).
Our site-specific results demonstrate the applicability of the proposed method, using the SPEI to describe the climate condition. The site in Spain provides an example of vulnerability to drought because the expected value of the SPEI is 0.4 lower for hazardous than for non-hazardous ecosystem behaviour. In northern Germany, on the contrary, the site is not vulnerable to drought because the SPEI expectation values imply wetter conditions in the hazard case than in the non-hazard case.
At the pan-European scale, ecosystem vulnerability to drought is calculated in the Mediterranean and temperate region, whereas Scandinavian ecosystems are vulnerable under conditions without water shortages. These first model- based applications indicate the conceptual advantages of the proposed method by focusing on the identification of critical weather conditions for which we observe hazardous ecosystem behaviour in the analysed data set. Application of the method to empirical time series and to future climate would be important next steps to test the approach.
Y1 - 2015
U6 - https://doi.org/10.5194/bg-12-1813-2015
SN - 1726-4170
SN - 1726-4189
VL - 12
IS - 6
SP - 1813
EP - 1831
PB - Copernicus
CY - Göttingen
ER -
TY - GEN
A1 - Moser, Othmar
A1 - Mueller, Alexander
A1 - Tschakert, Gerhard
A1 - Koehler, Gerd
A1 - Lawrence, Jimmy B.
A1 - Groeschl, Werner
A1 - Pieber, Thomas R.
A1 - Bracken, Richard M.
A1 - Hofmann, Peter
T1 - Exercise Prescription in Type 1 Diabetes: Should We Use Percentages of Maximum Heart Rate?
T2 - Medicine and science in sports and exercise : official journal of the American College of Sports Medicine
Y1 - 2017
U6 - https://doi.org/10.1249/01.mss.0000519798.35679.cf
SN - 0195-9131
SN - 1530-0315
VL - 49
SP - 1020
EP - 1020
PB - Lippincott Williams & Wilkins
CY - Philadelphia
ER -
TY - GEN
A1 - Werner, John S.
A1 - Cicerone, Carola M.
A1 - Kliegl, Reinhold
A1 - DellaRosa, Denise
T1 - Spectral efficiency of blackness induction
N2 - The spectral efficiency of blackness induction was measured in three normal trichromatic observers and in one deuteranomalous observer. The psychophysical task was to adjust the radiance of a monochromatic 60–120′ annulus until a 45′ central broadband field just turned black and its contour became indiscriminable from a dark surrounding gap that separated it from the annulus. The reciprocal of the radiance required to induce blackness with annulus wavelengths between 420 and 680 nm was used to define a spectral-efficiency function for the blackness component of the achromatic process. For each observer, the shape of this blackness-sensitivity function agreed with the spectral-efficiency function based on heterochromatic flicker photometry when measured with the same 60–120′ annulus. Both of these functions matched the Commission Internationale de l'Eclairage Vλ function except at short wavelengths. Ancillary measurements showed that the latter difference in sensitivity can be ascribed to nonuniformities of preretinal absorption, since the annular field excluded the central 60′ of the fovea. Thus our evidence indicates that, at least to a good first approximation, induced blackness is inversely related to the spectral-luminosity function. These findings are consistent with a model that separates the achromatic and the chromatic pathways.
T3 - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - paper 040
Y1 - 1984
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-16897
ER -
TY - JOUR
A1 - Qiu, X. L.
A1 - Wegener, Michael
A1 - Wirges, Werner
A1 - Zhang, X. Q.
A1 - Hillenbrand, J.
A1 - Xia, Zhongfu
A1 - Gerhard, Reimund
A1 - Sessler, G. M.
T1 - Penetration of sulfur hexafluoride into cellular polypropylene films and its effect on the electric charging and electromechanical response of ferroelectrets
N2 - Cellular polypropylene (PP) films were treated with sulfur hexafluoride (SF6) gas in order to study the SF6 penetration behaviour and optimize the electric charging conditions. There were differences in the penetration of SF6 for different cellular PP materials, depending on the microscopic properties, which manifest themselves in the voided structure as well as in the mechanical stiffnesses of the cellular films. The penetration of SF6 after long-term pressure treatment is confirmed in strongly inflated cellular PP films with a low mechanical stiffness of about 1 MPa. No SF6 penetration occurs for slightly inflated cellular PP films with smaller void sizes and higher mechanical stiffnesses of around 5.8 MPa. The observed thickness variations, the higher charging fields during corona charging because of SF6 penetration and the SF6 environment, as well as the resulting electromechanical properties are discussed
Y1 - 2005
SN - 0022-3727
ER -
TY - JOUR
A1 - Gerhard, Reimund
A1 - Wegener, Michael
A1 - Wirges, Werner
A1 - Giacometti, J. A.
A1 - Altafim, Ruy Alberto Pisani
A1 - Santos, Lucas F.
A1 - Faria, Roberto M.
A1 - Paajanen, Mika
T1 - Electrode polling of cellular polypropylene films with short high-voltage pulses
Y1 - 2002
SN - 0-7803-7502-5
ER -
TY - JOUR
A1 - Elling, B.
A1 - Pinnow, M.
A1 - Danz, Rudi
A1 - Wegener, Michael
A1 - Wirges, werner
A1 - Gerhard, Reimund
T1 - Coating of porous polytetrafluoroethylene films with other polymers for electret applications
Y1 - 2001
SN - 0-7803-7053-8
ER -
TY - JOUR
A1 - Wirges, Werner
A1 - Przyrembel, G.
A1 - Brinker, Walter
A1 - Gerhard, Reimund
A1 - Klemberg-Sapieha, J.
A1 - Martinu, L.
A1 - Poitras, D.
A1 - Wertheimer, M. R.
T1 - Metallised viscoelastic control layers for light-valve projection displays
Y1 - 1995
ER -
TY - JOUR
A1 - Lanca, M. C.
A1 - Wirges, Werner
A1 - Neagu, Eugen R.
A1 - Gerhard, Reimund
A1 - Marat-Mendes, José Narciso
T1 - Influence of humidity on the electrical charging properties of cork agglomerates
N2 - Cork is a natural cellular and electrically insulating material which may have the capacity to store electric charges on or in its cell walls. Since natural cork has many voids, it is difficult to obtain uniform samples with the required dimensions. Therefore, a more uniform material, namely commercial cork agglomerate, usually used for floor and wall coverings, is employed in the present study. Since we know from our previous work that the electrical properties of cork are drastically affected by absorbed and adsorbed water, samples were protected by means of different polymer coatings (applied by spin-coating or soaking). Corona charging and isothermal charging and discharging currents were used to study the electrical trapping and detrapping capabilities of the samples. A comparison of the results leads to the conclusion that the most promising method for storing electric charges in this cellular material consists of drying and coating or soaking with a hydrophobic, electrically insulating polymer such as polytetraflouroethylene (Teflon (R)). (c) 2007 Elsevier B.V. All rights reserved.
Y1 - 2007
UR - http://www.sciencedirect.com/science/journal/00223093
U6 - https://doi.org/10.1016/j.jnoncrysol.2007.03.037
SN - 0022-3093
ER -
TY - JOUR
A1 - Wegener, Michael
A1 - Wirges, Werner
A1 - Gerhard, Reimund
A1 - Dansachmüller, M.
A1 - Schwödiauer, R.
A1 - Bauer-Gogonea, Simona
A1 - Bauer, Siegfried
A1 - Paajanen, Mika
A1 - Minkkinen, Hannu
A1 - Raukola, J.
T1 - Controlled inflation of voids in cellular polymer ferroelectrets : optimizing electromechanical transducer properties
N2 - When exposed to sufficiently high electric fields, polymer-foam electret materials with closed cells exhibit ferroelectric-like behavior and may therefore be called ferroelectrets. In cellular ferroelectrets, the influence of the cell size and shape distributions on the application-relevant properties is not yet understood. Therefore, controlled inflation experiments were carried out on cellular polypropylene films, and the resulting elastical and electromechanical parameters were determined. The elastic modulus in the thickness direction shows a minimum with a corresponding maximum in the electromechanical transducer coefficient. The resonance frequency shifts as a function of the elastic modulus and the relative density of the inflated cellular films. Therefore, the transducer properties of cellular ferroelectrets can be optimized by means of controlled inflation. (C) 2004 American Institute of Physics
Y1 - 2004
ER -
TY - JOUR
A1 - Reindl, Nicole
A1 - Rauch, Thomas
A1 - Parthasarathy, M.
A1 - Werner, K.
A1 - Kruk, J. W.
A1 - Hamann, Wolf-Rainer
A1 - Sander, Andreas Alexander Christoph
A1 - Todt, Helge Tobias
T1 - The rapid evolution of the exciting star of the Stingray nebula
JF - Astronomy and astrophysics : an international weekly journal
N2 - Context. SAO 244567, the exciting star of the Stingray nebula, is rapidly evolving. Previous analyses suggested that it has heated up from an effective temperature of about 21 kK in 1971 to over 50 kK in the 1990s. Canonical post-asymptotic giant branch evolution suggests a relatively high mass while previous analyses indicate a low-mass star.
Aims. A comprehensive model-atmosphere analysis of UV and optical spectra taken during 1988-2006 should reveal the detailed temporal evolution of its atmospheric parameters and provide explanations for the unusually fast evolution.
Methods. Fitting line profiles from static and expanding non-LTE model atmospheres to the observed spectra allowed us to study the temporal change of effective temperature, surface gravity, mass-loss rate, and terminal wind velocity. In addition, we determined the chemical composition of the atmosphere.
Results. We find that the central star has steadily increased its effective temperature from 38 kK in 1988 to a peak value of 60 kK in 2002. During the same time, the star was contracting, as concluded from an increase in surface gravity from log g = 4.8 to 6.0 and a drop in luminosity. Simultaneously, the mass-loss rate declined from log(M/M-circle dot yr(-1)) = -9.0 to -11.6 and the terminal wind velocity increased from v(infinity) = 1800 km s(-1) to 2800 km s(-1). Since around 2002, the star stopped heating and has cooled down again to 55 kK by 2006. It has a largely solar surface composition with the exception of slightly subsolar carbon, phosphorus, and sulfur. The results are discussed by considering different evolutionary scenarios.
Conclusions. The position of SAO 244567 in the log T-eff-log g plane places the star in the region of sdO stars. By comparison with stellar-evolution calculations, we confirm that SAO 244567 must be a low-mass star (M < 0.55 M-circle dot). However, the slow evolution of the respective stellar evolutionary models is in strong contrast to the observed fast evolution and the young planetary nebula with a kinematical age of only about 1000 years. We speculate that the star could be a late He-shell flash object. Alternatively, it could be the outcome of close-binary evolution. Then SAD 244567 would be a low-mass (0.354 M-circle dot) helium pre-white dwarf after the common-envelope phase, during which the planetary nebula was ejected.
KW - stars: abundances
KW - stars: evolution
KW - stars: AGB and post-AGB
KW - stars: individual: SAO 244567
KW - stars: fundamental parameters
KW - planetary nebulae: individual: Stingray nebula (Henize 3-1357)
Y1 - 2014
U6 - https://doi.org/10.1051/0004-6361/201323189
SN - 0004-6361
SN - 1432-0746
VL - 565
PB - EDP Sciences
CY - Les Ulis
ER -
TY - JOUR
A1 - Löbling, Lisa
A1 - Rauch, Thomas
A1 - Bertolami Miller, Marcelo Miguel
A1 - Todt, Helge Tobias
A1 - Friederich, F.
A1 - Ziegler, M.
A1 - Werner, Klaus
A1 - Kruk, J. W.
T1 - Spectral analysis of the hybrid PG 1159-type central stars of the planetary nebulae Abell 43 and NGC7094
JF - Monthly notices of the Royal Astronomical Society
N2 - Stellar post asymptotic giant branch (post-AGB) evolution can be completely altered by a final thermal pulse (FTP) which may occur when the star is still leaving the AGB (AFTP), at the departure from the AGB at still constant luminosity (late TP, LTP) or after the entry to the white-dwarf cooling sequence (very late TP, VLTP). Then convection mixes the Herich material with the H-rich envelope. According to stellar evolution models the result is a star with a surface composition of H approximate to 20 per cent by mass (AFTP), approximate to 1 per cent (LTP), or (almost) no H (VLTP). Since FTP stars exhibit intershell material at their surface, spectral analyses establish constraints for AGB nucleosynthesis and stellar evolution. We performed a spectral analysis of the so-called hybrid PG 1159-type central stars (CS) of the planetary nebulae Abell 43 and NGC7094 by means of non-local thermodynamical equilibrium models. We confirm the previously determined effective temperatures of T-eff = 115 000 +/- 5 000K and determine surface gravities of log (g /(cm s(-2))) = 5.6 +/- 0.1 for both. From a comparison with AFTP evolutionary tracks, we derive stellar masses of 0.57(-0.04)(+0.07)M(circle dot) and determine the abundances of H, He, and metals up to Xe. Both CS are likely AFTP stars with a surface H mass fraction of 0.25 +/- 0.03 and 0.15 +/- 0.03, respectively, and an Fe deficiency indicating subsolar initial metallicities. The light metals show typical PG 1159-type abundances and the elemental composition is in good agreement with predictions from AFTP evolutionary models. However, the expansion ages do not agree with evolution time-scales expected from the AFTP scenario and alternatives should be explored.
KW - stars: abundances
KW - stars: AGB and post-AGB
KW - stars: atmospheres
KW - stars: evolution
KW - stars: individual: WD1751+106
KW - stars: individual: WD2134+125
Y1 - 2019
U6 - https://doi.org/10.1093/mnras/stz1994
SN - 0035-8711
SN - 1365-2966
VL - 489
IS - 1
SP - 1054
EP - 1071
PB - Oxford Univ. Press
CY - Oxford
ER -
TY - GEN
A1 - Ludwig, Joachim
A1 - Busse, Stefan
A1 - Linde, Klaus
A1 - Merkel, Torsten
A1 - Niewenhuis, Loek F. M.
A1 - Reihert, Claudia
A1 - Wittwer, Wolfgang
A1 - Polster, Andreas
A1 - Fricke, Werner
A1 - Scholz, Sylka
A1 - Wagner, Gabriele
A1 - Wernet, Andreas
A1 - Rehfeldt, Janine
A1 - Dreke, Claudia
A1 - Weis, Michael
ED - Ludwig, Joachim
T1 - Interdisziplinarität als Chance
BT - Wissenschaftstransfer und Beratung im lernenden Forschungszusammenhang
N2 - Interdisziplinarität und die damit verknüpften Fragen hat das Forschungsprojekt "Lernender Forschungszusammenhang" untersucht. Diese Publikation beschreibt ein Forschungskonzept, mit dem betriebliche Modernisierungsprojekte in fünf Großunternehmen interdisziplinär untersucht wurden. Die Forschungsergebnisse aus zwei dieser Unternehmen werden detailliert dargestellt. Der Leser kann entlang dokumentierter Forschungsergebnisse selbst nachvollziehen, in welcher Weise sich die Wissenschaftler aus unterschiedlichen Disziplinen lernend aufeinander bezogen haben.
T3 - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - paper 269
KW - Unternehmen
KW - Wissenschaftstransfer
KW - Teamwork
KW - Interdisziplinarität
KW - Lerntheorie
KW - Innovation
Y1 - 2008
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-74880
ER -
TY - JOUR
A1 - Werner, Klaus
A1 - Dreizler, S.
A1 - Heber, Ulrich
A1 - Rauch, Thomas
A1 - Fleming, T. A.
A1 - Sion, E. M.
A1 - Vauclair, G.
T1 - High resolution spectroscopy of two hot (pre-) white dwarfs with the Hubble space telescope : KPD 0005+5106 and RXJ 2117+3412
Y1 - 1996
ER -
TY - JOUR
A1 - Werner, Klaus
A1 - Dreizler, S.
A1 - Rauch, Thomas
A1 - Barnstedt, Jürgen
A1 - Göz, M.
A1 - Gringel, W.
A1 - Kappelmann, N.
A1 - Krämer, G.
A1 - Widmann, H.
A1 - Koesterke, Lars
A1 - Haas, S.
A1 - Heber, Ulrich
A1 - Appenzeller, Immo
T1 - FUV spectroscpy of DO an PG 1159 stars with ORFEUS
Y1 - 1999
ER -
TY - JOUR
A1 - Annemarie, Ambühl
A1 - Weiss, Irene M.
A1 - Schierl, Petra
A1 - Schmitzer, Ulrich
A1 - Kirichenko, Alexander
A1 - Heinemann, Matthias
A1 - Weiß, Adrian
A1 - Esposito, Paolo
A1 - Grewing, Farouk F.
A1 - Merli, Elena
A1 - Feichtinger, Barbara
A1 - Seng, Helmut
A1 - Wieber, Anja
A1 - Schollmeyer, Patrick
A1 - Kranzdorf, Anna
A1 - Werner, Eva
A1 - Wöhrle, Georg
A1 - Brinker, Wolfram
A1 - Di Rocco, Emilia
A1 - Wesselmann, Katharina
A1 - Löbcke, Konrad
A1 - Benedetti, Ginevra
ED - Ambühl, Annemarie
T1 - tessellae – Birthday Issue for Christine Walde
T2 - thersites
N2 - This special birthday issue for Christine Walde, co-founder and co-editor of thersites, features contributions from colleagues and friends. The articles, essays, and book reviews, centering around the honoranda’s research interests as well as focusing on core topics of thersites, form a thematically varied mosaic (tessellae): innovative constructions of literary genres and poetics (especially bucolic, elegy, epic, and epigram), images of the city of Rome and its counterparts, sleep and dreams, history of classical scholarship, gender studies, and classical reception studies.
Y1 - 2020
U6 - https://doi.org/10.34679/thersites.vol11
SN - 2364-7612
VL - 2020
IS - 11
ER -
TY - GEN
A1 - Federici, S.
A1 - Pohl, Martin
A1 - Ruppel, J.
A1 - Telezhinsky, Igor O.
A1 - Hofmann, Werner
A1 - Martinez, M.
A1 - Knapp, J.
T1 - Design concepts for the Cherenkov Telescope Array CTA
BT - an advanced facility for ground-based high-energy gamma-ray astronomy
T2 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2 - Ground-based gamma-ray astronomy has had a major breakthrough with the impressive results obtained using systems of imaging atmospheric Cherenkov telescopes. Ground-based gamma-ray astronomy has a huge potential in astrophysics, particle physics and cosmology. CTA is an international initiative to build the next generation instrument, with a factor of 5-10 improvement in sensitivity in the 100 GeV-10 TeV range and the extension to energies well below 100 GeV and above 100 TeV. CTA will consist of two arrays (one in the north, one in the south) for full sky coverage and will be operated as open observatory. The design of CTA is based on currently available technology. This document reports on the status and presents the major design concepts of CTA.
T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1325
KW - ground based gamma ray astronomy
KW - next generation Cherenkov telescopes
KW - design concepts
Y1 - 2011
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-430149
SN - 1866-8372
VL - 32
IS - 1325
ER -
TY - BOOK
A1 - Jennek, Julia
A1 - Rother, Stefanie
A1 - Tosch, Frank
A1 - Wendland, Mirko
A1 - Kludt, Steffen
A1 - Krauskopf, Karsten
A1 - Kitschke, Dorothea
A1 - Maar, Verena
A1 - Knigge, Michel
A1 - Gnädig, Susanne
A1 - Seidel, Astrid
A1 - Siehr, Karl-Heinz
A1 - Wienecke, Maik
A1 - Günther, Claudia-Susanne
A1 - Reitz-Koncebovski, Karen
A1 - Klöpping, Peter M.
A1 - Kücholl, Denise
A1 - Lazarides, Rebecca Christine
A1 - Westphal, Andrea
A1 - Scherreiks, Lynn
A1 - Kuhr, Linda
A1 - Wilbert, Jürgen
A1 - Gronostaj, Anna
A1 - Vock, Miriam
A1 - Zaruba, Nicole
A1 - Ahlgrimm, Frederik
A1 - Link, Jörg-Werner
A1 - Körner, Dorothea
A1 - Barseghyan, Anahit
A1 - Glowinski, Ingrid
ED - Jennek, Julia
T1 - Professionalisierung in Praxisphasen
BT - Ergebnisse der Lehrerbildungsforschung an der Universität Potsdam
T3 - Potsdamer Beiträge zur Lehrerbildung und Bildungsforschung
N2 - Schulpraktika bilden die zentrale Grundlage der Lehrerbildung in Potsdam. Bereits im Potsdamer Modell der Lehrerbildung (1993) sind sie festgehalten, seit der Integration des Schulpraktikums (Praxissemesters) 2008 absolvieren alle Potsdamer Lehramtsstudierenden fünf Pflichtpraktika. Während die Ziele der Praktika klar beschrieben sind, sind die tatsächlichen Lernerfolge nicht immer klar – ebenso wenig, wie die Begleitung der Praktika aussehen muss, um die Studierenden bestmöglich zu unterstützen. Auch die Integration in weitere Lehrveranstaltungen des Studiums ist ein noch offenes Feld, das weiterer Betrachtung verdient. Die unterschiedliche Ausrichtung der Potsdamer Praktika, Perspektivwechsel im Orientierungs-/Integriertem Eingangspraktikum, Selbstreflektion im Praktikum in pädagogisch-psychologischen Handlungsfeldern, Unterricht als Profession in den Fachdidaktischen Tagespraktika, Anwendung von Diagnostik im psychodiagnostischen Praktikum und die Synthese all dessen im Schulpraktikum, bieten dafür zahlreiche Ansatzpunkte.
Schulpraktika sind nicht nur ein zentraler und von Studierenden hoch geschätzter Bestandteil des Studiums, sondern werden auch zunehmend für die Bildungsforschung interessant. Fragen nach der Kompetenzentwicklung, Selbsteinschätzungen und der Entwicklung der Reflexionsfähigkeit von Studierenden stehen dabei ebenso im Fokus wie die Einschätzung der universitären Begleitung und der Einbindung ins weitere Studium.
Der vorliegende Band versammelt Studien von Wissenschaftlerinnen und Wissenschaftler der Universität Potsdam, die die fünf Pflichtpraktika im Lehramtsstudium unter unterschiedlichen Blickwinkel beforschen. Besonders hervorzuheben ist, dass die Wissenschaftlerinnen und Wissenschaftler aus unterschiedlichen Disziplinen stammen und somit die Praktika mit verschiedenen Instrumenten und aus unterschiedlichen Blickwinkeln betrachten. Die präsentierten Ergebnisse bilden eine gute Grundlage, um die Praktika in Potsdam und an anderen Standorten weiterzuentwickeln.
T3 - Potsdamer Beiträge zur Lehrkräftebildung und Bildungsforschung - 2
KW - Lehrkräftebildung
KW - Schulpraktikum
KW - Lehramtsstudium
KW - Berufspraktische Studien
KW - Praxissemester
Y1 - 2022
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-500964
SN - 978-3-86956-508-8
SN - 2626-3556
SN - 2626-4722
IS - 2
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -