TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - 27 Watt average output power with 1.2*DL beam quality from a single rod Nd:YAG-Laser with phase conjugating SBS- mirror
BT  - Siebenundzwanzig Watt average output power with 1.2*DL beam quality from a single rod Nd:YAG-Laser with phase conjugating SBS-mirror
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Evans, Chris J.
A1  - van Loon, Jacco Th.
A1  - Hainich, Rainer
A1  - Bailey, M.
T1  - 2dF-AAOmega spectroscopy of massive stars in the Magellanic Clouds The north-eastern region of the Large Magellanic Cloud
JF  - Astronomy and astrophysics : an international weekly journal
N2  - We present spectral classifications from optical spectroscopy of 263 massive stars in the north-eastern region of the Large Magellanic Cloud. The observed two-degree field includes the massive 30 Doradus star-forming region, the environs of SN1987A, and a number of star-forming complexes to the south of 30 Dor. These are the first classifications for the majority (203) of the stars and include eleven double-lined spectroscopic binaries. The sample also includes the first examples of early OC-type spectra (AA Omega 30 Dor 248 and 280), distinguished by the weakness of their nitrogen spectra and by C IV lambda 4658 emission. We propose that these stars have relatively unprocessed CNO abundances compared to morphologically normal O-type stars, indicative of an earlier evolutionary phase. From analysis of observations obtained on two consecutive nights, we present radial-velocity estimates for 233 stars, finding one apparent single-lined binary and nine (>3 sigma) outliers compared to the systemic velocity; the latter objects could be runaway stars or large-amplitude binary systems and further spectroscopy is required to investigate their nature.
KW  - Magellanic Clouds
KW  - stars: early-type
KW  - stars: fundamental parameters
KW  - open clusters and associations: general
Y1  - 2015
U6  - https://doi.org/10.1051/0004-6361/201525882
SN  - 1432-0746
VL  - 584
PB  - EDP Sciences
CY  - Les Ulis
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Menzel, Ralf
T1  - 34 Watt flash lamp pumped single rod ND:YAG laser with 1.2 * DL beam quality via special resonator design
BT  - Vierunddreißig Watt flash lamp pumped single rod ND:YAG laser with 1.2 * DL beam quality via special resonator design
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Pham, Cong Duc
A1  - Petre, Anca
A1  - Berquez, Laurent
A1  - Flores Suárez, Rosaura
A1  - Mellinger, Axel
A1  - Wirges, Werner
A1  - Gerhard, Reimund
T1  - 3D high-resolution mapping of polarization profiles in thin poly(vinylidenefluoride-trifluoroethylene) (PVDF- TrFE) films using two thermal techniques
N2  - In this paper, two non-destructive thermal methods are used in order to determine, with a high degree of accuracy, three-dimensional polarization distributions in thin films (12 mu m) of poly(vinylidenefluoride- trifluoroethylene) (PVDF-TrFE). The techniques are the frequency-domain Focused Laser Intensity Modulation Method (FLIMM) and time-domain Thermal-Pulse Tomography (TPT). Samples were first metalized with grid-shaped electrode and poled. 3D polarization mapping yielded profiles which reproduce the electrode-grid shape. The polarization is not uniform across the sample thickness. Significant polarization values are found only at depths beyond 0.5 mu m from the sample surface. Both methods provide similar results, TPT method being faster, whereas the FLIMM technique has a better lateral resolution.
Y1  - 2009
UR  - http://ieeexplore.ieee.org/servlet/opac?punumber=94
U6  - https://doi.org/10.1109/TDEI.2009.5128505
SN  - 1070-9878
ER  - 
TY  - JOUR
A1  - Madura, T. I.
A1  - Clementel, N.
A1  - Gull, T. R.
A1  - Kruip, C. J. H.
A1  - Paardekooper, J.-P.
A1  - Icke, V.
T1  - 3D hydrodynamical and radiative transfer modeling of η Carinae's colliding winds
JF  - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015
N2  - We present results of full 3D hydrodynamical and radiative transfer simulations of the colliding stellar winds in the massive binary system η Carinae. We accomplish this by applying the SimpleX algorithm for 3D radiative transfer on an unstructured Voronoi-Delaunay grid to recent 3D smoothed particle hydrodynamics (SPH) simulations of the binary colliding winds. We use SimpleX to obtain detailed ionization fractions of hydrogen and helium, in 3D, at the resolution of the original SPH simulations. We investigate several computational domain sizes and Luminous Blue Variable primary star mass-loss rates. We furthermore present new methods of visualizing and interacting with output from complex 3D numerical simulations, including 3D interactive graphics and 3D printing. While we initially focus on η Car, the methods employed can be applied to numerous other colliding wind (WR 140, WR 137, WR 19) and dusty `pinwheel' (WR 104, WR 98a) binary systems. Coupled with 3D hydrodynamical simulations, SimpleX simulations have the potential to help determine the regions where various observed time-variable emission and absorption lines form in these unique objects.
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87930
SP  - 163
EP  - 166
ER  - 
TY  - JOUR
A1  - Reyes-Iturbide, J.
A1  - Velázquez, Pablo F.
A1  - Rosado, M.
T1  - 3D numerical model for NGC 6888 Nebula
JF  - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015
N2  - We present 3D numerical simulations of the NGC6888 nebula considering the proper motion and the evolution of the star, from the red supergiant (RSG) to the Wolf-Rayet (WR) phase. Our simulations reproduce the limb-brightened morphology observed in [OIII] and X-ray emission maps. The synthetic maps computed by the numerical simulations show filamentary and clumpy structures produced by instabilities triggered in the interaction between the WR wind and the RSG shell.
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88485
SP  - 363
ER  - 
TY  - JOUR
A1  - Thompson, W. T.
A1  - Kliem, Bernhard
A1  - Toeroek, Tibor
T1  - 3D reconstruction of a rotating erupting prominence
JF  - Solar physics : a journal for solar and solar-stellar research and the study of solar terrestrial physics
N2  - A bright prominence associated with a coronal mass ejection (CME) was seen erupting from the Sun on 9 April 2008. This prominence was tracked by both the Solar Terrestrial Relations Observatory (STEREO) EUVI and COR1 telescopes, and was seen to rotate about the line of sight as it erupted; therefore, the event has been nicknamed the "Cartwheel CME." The threads of the prominence in the core of the CME quite clearly indicate the structure of a weakly to moderately twisted flux rope throughout the field of view, up to heliocentric heights of 4 solar radii. Although the STEREO separation was 48A degrees, it was possible to match some sharp features in the later part of the eruption as seen in the 304 line in EUVI and in the H alpha-sensitive bandpass of COR1 by both STEREO Ahead and Behind. These features could then be traced out in three-dimensional space, and reprojected into a view in which the eruption is directed toward the observer. The reconstructed view shows that the alignment of the prominence to the vertical axis rotates as it rises up to a leading-edge height of a parts per thousand aEuro parts per thousand 2.5 solar radii, and then remains approximately constant. The alignment at 2.5 solar radii differs by about 115A degrees from the original filament orientation inferred from H alpha and EUV data, and the height profile of the rotation, obtained here for the first time, shows that two thirds of the total rotation are reached within a parts per thousand aEuro parts per thousand 0.5 solar radii above the photosphere. These features are well reproduced by numerical simulations of an unstable moderately twisted flux rope embedded in external flux with a relatively strong shear field component.
KW  - Corona, active
KW  - Prominences, active
KW  - Coronal mass ejections
KW  - Initiation and propagation
KW  - Magnetic fields, corona
Y1  - 2012
U6  - https://doi.org/10.1007/s11207-011-9868-5
SN  - 0038-0938
VL  - 276
IS  - 1-2
SP  - 241
EP  - 259
PB  - Springer
CY  - Dordrecht
ER  - 
TY  - JOUR
A1  - Ostermeyer, Martin
A1  - Menzel, Ralf
T1  - 50 Watt average output power with 1.2*DL beam quality from a single rod Nd:YALO laser with phase-conjugating SBS mirror
BT  - Fünfzig Watt average output power with 1.2*DL beam quality from a single rod Nd:YALO laser with phase- conjugating SBS mirror
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Gerhard, Reimund
T1  - 50 years of International Symposia on Electrets from 1967 to 2017
BT  - a global history
JF  - IEEE electrical insulation magazine / Institute of Electrical and Electronics Engineers
N2  - The prehistory of electrets is not known yet, but it is quite likely that the electrostatic charging behavior of amber (Greek: τò ηλεκτρoν, i.e., “electron”) already was familiar to people in ancient cultures (China, Egypt, Greece, etc.), before the Greek philosopher and scientist Thales of Miletus (6th century BCE)-or rather his disciples and followers-reported it in writing (cf. Figure 1). More than two millennia later, William Gilbert (1544–1603), the physician of Queen Elizabeth I, coined the term “electric” in his book De Magnete, Magneticisque Corporibus, et de Magno Magnete Tellure (1600) for dielectric materials that attract like amber and that included sulfur and glass [1]. The second half of the 18th century saw the invention of the electrophorus or electrophore [2], a capacitive electret device, in 1762 by Johan Carl Wilcke (1732–1796).
Y1  - 2021
U6  - https://doi.org/10.1109/MEI.2021.9352710
SN  - 0883-7554
SN  - 1558-4402
VL  - 37
IS  - 2
SP  - 50
EP  - 55
PB  - IEEE
CY  - New York, NY
ER  - 
TY  - JOUR
A1  - Koesterke, Lars
A1  - Hamann, Wolf-Rainer
T1  - [WC]-type CSPN : clumping and wind-driving
N2  - Many Central Stars of Planetary Nebulae are very similar to massive Wolf-Rayet stars of the carbon sequence with respect to their spectra, chemical composition and wind properties. Therefore their study opens an additional way towards the understanding of the Wolf-Rayet phenomenon. While the study of Line Profile Variation will be difficult, espescially for the very compact early types, the comparision with other hydrogen-deficient Central Stars illuminates the driving mechanism of their winds. We speculate that at least two ingredients are needed. The ionization of their atmpospheres has to be stratified to enable multi-scattering processes and the amount of carbon and oxygen has to be high (more than a few percent by mass).
Y1  - 2002
ER  -