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  - 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  - Zoller, Peter
A1  - Beth, Thomas
A1  - Binosi, D.
A1  - Blatt, Rainer
A1  - Briegel, Hans J.
A1  - Bruss, D.
A1  - Calarco, Tommaso
A1  - Cirac, Juan Ignacio
A1  - Deutsch, David
A1  - Eisert, Jens
A1  - Ekert, Artur
A1  - Fabre, Claude
A1  - Gisin, Nicolas
A1  - Grangiere, P.
A1  - Grassl, Markus
A1  - Haroche, Serge
A1  - Imamoglu, Atac
A1  - Karlson, A.
A1  - Kempe, Julia
A1  - Kouwenhoven, Leo P.
A1  - Kröll, S.
A1  - Leuchs, Gerd
A1  - Lewenstein, Maciej
A1  - Loss, Daniel
A1  - Lütkenhaus, Norbert
A1  - Massar, Serge
A1  - Mooij, J. E.
A1  - Plenio, Martin Bodo
A1  - Polzik, Eugene
A1  - Popescu, Sandu
A1  - Rempe, Gerhard
A1  - Sergienko, Alexander
A1  - Suter, David
A1  - Twamley, John
A1  - Wendin, Göran
A1  - Werner, Reinhard F.
A1  - Winter, Andreas
A1  - Wrachtrup, Jörg
A1  - Zeilinger, Anton
T1  - Quantum information processing and communication : Strategic report on current status, visions and goals for research in Europe
N2  - We present an excerpt of the document "Quantum Information Processing and Communication: Strategic report on current status, visions and goals for research in Europe", which has been recently published in electronic form at the website of FET (the Future and Emerging Technologies Unit of the Directorate General Information Society of the European Commission, http://www.cordis.lu/ist/fet/qipc-sr.htm). This document has been elaborated, following a former suggestion by FET, by a committee of QIPC scientists to provide input towards the European Commission for the preparation of the Seventh Framework Program. Besides being a document addressed to policy makers and funding agencies (both at the European and national level), the document contains a detailed scientific assessment of the state-of-the-art, main research goals, challenges, strengths, weaknesses, visions and perspectives of all the most relevant QIPC sub-fields, that we report here
Y1  - 2005
SN  - 1434-6060
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  - Broscheit, Frank
A1  - Bütow, Martin
A1  - Englert, Wolfgang
A1  - Jahn, Gert
A1  - Klohn, Werner
A1  - Knitschky, Wolfgang
A1  - Reinecke, Hans-Joachim
A1  - Müller, Helmut
A1  - Reinhardt, Karl Heinz
A1  - Schmidt, Marianne
A1  - Schmidtke, Kurt-Dietmar
A1  - Schöpflin, F.
A1  - Starke, Rainer
A1  - Vahldiek, B. W.
A1  - Wehrs, Klaus
A1  - Wetzel, Jürgen
T1  - Seydlitz Erdkunde 2
Y1  - 1996
PB  - Schroedel
CY  - Hannover
ER  - 
TY  - JOUR
A1  - Gross, David
A1  - Nesme, V.
A1  - Vogts, H.
A1  - Werner, Reinhard F.
T1  - Index theory of one dimensional quantum walks and cellular automata
JF  - Communications in mathematical physics
N2  - If a one-dimensional quantum lattice system is subject to one step of a reversible discrete-time dynamics, it is intuitive that as much "quantum information" as moves into any given block of cells from the left, has to exit that block to the right. For two types of such systems - namely quantum walks and cellular automata - we make this intuition precise by defining an index, a quantity that measures the "net flow of quantum information" through the system. The index supplies a complete characterization of two properties of the discrete dynamics. First, two systems S-1, S-2 can be "pieced together", in the sense that there is a system S which acts like S-1 in one region and like S-2 in some other region, if and only if S-1 and S-2 have the same index. Second, the index labels connected components of such systems: equality of the index is necessary and sufficient for the existence of a continuous deformation of S-1 into S-2. In the case of quantum walks, the index is integer-valued, whereas for cellular automata, it takes values in the group of positive rationals. In both cases, the map S bar right arrow. ind S is a group homomorphism if composition of the discrete dynamics is taken as the group law of the quantum systems. Systems with trivial index are precisely those which can be realized by partitioned unitaries, and the prototypes of systems with non-trivial index are shifts.
Y1  - 2012
U6  - https://doi.org/10.1007/s00220-012-1423-1
SN  - 0010-3616
VL  - 310
IS  - 2
SP  - 419
EP  - 454
PB  - Springer
CY  - New York
ER  - 
TY  - JOUR
A1  - Guetschow, Johannes
A1  - Nesme, Vincent
A1  - Werner, Reinhard F.
T1  - Self-similarity of cellular automata on abelian groups
JF  - Journal of cellular automata
N2  - It is well known that the spacetime diagrams of some cellular automata have a self-similar fractal structure: for instance Wolfram's rule 90 generates a Sierpinski triangle. Explaining the self-similarity of the spacetime diagrams of cellular automata is a well-explored topic, but virtually all of the results revolve around a special class of automata, whose typical features include irreversibility, an alphabet with a ring structure, a global evolution that is a ring homomorphism, and a property known as (weakly) p-Fermat. The class of automata that we study in this article has none of these properties. Their cell structure is weaker, as it does not come with a multiplication, and they are far from being p-Fermat, even weakly. However, they do produce self-similar spacetime diagrams, and we explain why and how.
KW  - fractal
KW  - abelian group
KW  - linear cellular automaton
KW  - substitution system
KW  - self-similarity
Y1  - 2012
SN  - 1557-5969
VL  - 7
IS  - 2
SP  - 83
EP  - 113
PB  - Old City Publishing Science
CY  - Philadelphia
ER  - 
TY  - JOUR
A1  - Arrighi, Pablo
A1  - Nesme, Vincent
A1  - Werner, Reinhard F.
T1  - One-Dimensional quantum cellular automata
JF  - International journal of unconventional computing : non-classical computation and cellular automata
N2  - We define and study quantum cellular automata (QCA). We show that they are reversible and that the neighborhood of the inverse is the opposite of the neighborhood. We also show that QCA always admit, modulo shifts, a two-layered block representation. Note that the same two-layered block representation result applies also over infinite configurations, as was previously shown for one-dimensional systems in the more elaborate formalism of operators algebras [18]. Here the proof is simpler and self-contained, moreover we discuss a counterexample QCA in higher dimensions.
KW  - cellular automata
KW  - quantum
KW  - neighborhood
KW  - block representation
Y1  - 2011
SN  - 1548-7199
VL  - 7
IS  - 4
SP  - 223
EP  - 244
PB  - Old City Publishing Science
CY  - Philadelphia
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  -