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SFB 591 » Veranstaltung » 2006
 

Lectures 2006

19.01.2006
     11:15
Dr. Miguel Avillez University Evora, Portugal & University Vienna, Austria
Interstellar Turbulence - Results from MHD AMR simulations
Aushang
Seminarraum NA7/32
Astronomisches Institut
Ruhr-Universität Bochum
09.02.2006
     16:15
Prof. Dr. J. Schneider Rheinisch-Westfälische Technische Hochschule Aachen
Vacuum Arc Deposition of Hard Coatings
Aushang
NB 5/158
Institut für Experimentalphysik II Anwendungsorientierte Plasmaphysik
Ruhr-Universität Bochum
16.02.2006
     10:15
Prof. Dr. Ralph Neuhäuser Jena
GQ Lupi and its substellar companion
Aushang
NA 7/32
Astronomisches Institut
Ruhr-Universität Bochum
06.04.2006
     14:30
Prof. Dr. Alexander Lazarian University of Wisconsin, Madison, USA
How to study magnetic turbulence
Aushang
NB 7/67
Institut für Theoretische Physik IV Weltraum- und Astrophysik
Ruhr-Universität Bochum
07.04.2006
     14:00
Dipl.-Phys. George Felix Leu fmt - Forschungszentrum für Mikrostrukturtechnik, Bergische Universität Wuppertal
Experimentelle Untersuchung und Modellierung der Volumenprozesse ...
Aushang
...in einem mikrowellenangeregten Hexamethyldisiloxan/Sauersoff/Argon-Beschichtungsplasma. Herzliche Einladung zu diesem Kolloquiumsvortrag, dem ersten Teil der Promotionsprüfung von Herrn Leu!
Campus Freudenberg, Hörsaal FZH 2
Forschungszentrum für Mikrostrukturtechnik
Bergische Universität Wuppertal
12.04.2006
     14:00
Prof. Dr. Chr. Hollenstein Industrielle Plasmen, EPFL-CRPP Lausanne
Industrielle Plasmaphysik an der Universität - einige Beispiele
Aushang
Seminarraum EPII, NB 5/158
Institut für Experimentalphysik II Anwendungsorientierte Plasmaphysik
Ruhr-Universität Bochum
24.04.2006
     14:15
Dr. Subhasis Roy ASTRON Dwingeloo
The galactic centre at low radio frequencies
Aushang
NA7/32
Astronomisches Institut
Ruhr-Universität Bochum
15.05.2006
     14:00
Dr. Mansour ElSabbagh Al-Azhar University, Cairo, Egypt
Laser Thomson Scattering for Atmospheric Pressure Non-equilibrium Plasmas; Possibilities & Limitations
Aushang
Atmospheric pressure non-equilibrium plasmas are widely used in many applications such as sterilizations, nano-particle technology, deposition, etching, and decontamination of chemical & biological warfare agents. Diagnostics of the plasma electron properties are crucial for understanding physical and chemical processes which take place in such plasmas. Many diagnostic techniques such as Langmuir probes, optical emission spectroscopy (OES), microwave interferometery, have been used to study these plasmas. These techniques are not reliable in atmospheric pressure regime. Laser Thomson scattering (LTS) is a very attractive technique to measure various plasma parameters and to verify results measured using other diagnostic techniques, because it is relatively non-intrusive, the interpretation of the measured results is straightforward and assumptions on the plasma parameters are usually not necessary. In this talk the possibilities and the limitations of applying LTS technique to measure the electron properties of atmospheric pressure plasma jet (APPJ) will be discussed.
Rainer-Gruenter-Str. 21, Geb. FM, Seminarraum 105
Forschungszentrum für Mikrostrukturtechnik
Bergische Universität Wuppertal
18.05.2006
     16:15
Dr. Eric Neyts University Antwerpen
MD simulations of plasma surface interactions
Aushang
NB 5 / 158
Institut für Experimentalphysik II Anwendungsorientierte Plasmaphysik
Ruhr-Universität Bochum
01.06.2006
     16:15
Dr. Dragana Maric LPTP, Ecole Polytechnique, Paris
Ionization coefficients in gas mixtures
Aushang
We summarized the data for analytic parametrization of ionization coefficients in individual gases and tested the application of the common E/N (Wieland approximation) and the common mean energy (CME) combination of data for pure gases to obtain ionization coefficients for mixtures. Standard Wieland approximation gives poor results in general, due to the fact that the electron energy distribution is considerably different in mixtures and in individual gases at the same values of E/N, while the CME method provides an extended region of reasonable usefulness (Maric; et al., 2005). Test calculations were made for Ar-CH4, Ar-N2, He-Xe and CH4-N2 mixtures.
NB 5/158
Institut für Experimentalphysik II Anwendungsorientierte Plasmaphysik
Ruhr-Universität Bochum
13.06.2006
     15:30
Dr. Gerrit Kühn Universität Hannover
Nichtgleichgewichts-Plasmadiagnostik im Kathodenbereich
Aushang
Gebäude IC / 1 Raum 49
Lehrstuhl für Allgemeine Elektrotechnik und Plasmatechnik
Ruhr-Universität Bochum
20.06.2006
     11:00
Prof. Dr. Vahe Petrosian Stanford University, Depts. of Physics and Applied Physics, Stanford CA 94305-4060 - USA
Quiescent and Flare Emission from SgrA*: A Case for Stochastic Acceleration of Particles
Aushang
Sgr A* source has been detected from cm radio range to TeV gamma-rays with considerable short term (< 1hr) flaring activity mainly in near infrared and soft X-ray energies. These observations will be reviewed and the emission mechanisms responsible for them will be described. Then It will shown that the particle acceleration models based on stochastic acceleration by turbulence can account for most of the observed features and how the current and future observations can constrain the physical conditions in the accretion flow around the black hole at the center of the Milky Way.
Besprechungsraum NB 7/67
Institut für Theoretische Physik IV Weltraum- und Astrophysik
Ruhr-Universität Bochum
27.06.2006
     00:00
7. Symposium
Mehr
Symposium Nr. 7 des SFB 591 am 27. und 28. Juni 2006
Hölterhoffstift - Physikzentrum Bad Honnef

03.07.2006
     14:00
Dr. Susanne Aalto Onsala Space Observatory
Molecules as probes of activity and evolution in major and minor mergers
Aushang
I will present ongoing attempts at using molecular emission as probes of the highly extinced inner regions of mergers and interacting galaxies. The molecular emission can be used as a tracer of dynamics and distribution of the inner material - as well as a probe of the actual physical conditions of the gas. Lately, the astrochemical aspects of molecular spectroscopy has become recognised as a useful tracer of both type of activity and its evolution - even in galaxies at cosmological distances. Important steps have been taken towards turning molecular line ratios into new useful diagnostic tools. However, in the extreme environments of ULIRGs and AGNs, molecular excitation may behave in unexpected ways, complicating our attempts at modelling their abundance.
NA7/32
Astronomisches Institut
Ruhr-Universität Bochum
11.07.2006
     14:00
Paul Hoess Paul Hoess KG, München
Noise performance comparison of ICCD with CCD and EMCCD cameras
Aushang
High quality imaging is a key parameter in many scientific applications. CCD and ICCD cameras have proven to be powerful tools and are consequently used in a wide range of fields such as engineering research and physical or biological sciences. The very new Electron Multiplying CCD technology seems now to provide the most sensitive detection capabilities. Here we compare analytically the signal-to-noise performance of the three systems and identify the most influencing parameters. The SNR provided by CCDs is strongly influenced by the readout noise and is also a significant function of the pixel rate. ICCD cameras are practically not at all affected by the CCD chip temperature and are shown to be mostly shot-noise-limited because readout and dark current noises are negligible. Therefore no cooling is needed for ICCDs. Although EMCCDs unite the quantum efficiency of CCDs and the gain of ICCDs, their performance is constricted by charge transfer and dark current noises which will be multiplied up along with the signal by the gain register. Therefore, EMCCDs must be strongly cooled (down to -70°C) and slowly read out in order to get rid of any unwanted “pseudo signal”. In addition, their properties limit exposure times to milliseconds time scales and longer. We conclude that ICCD cameras remain the most efficient systems in all gated experiments and perform very well in extreme low light situations. They still keep great advantages over standard CCDs and the new incoming generation of EMCCDs. Keywords: CCD, ICCD, EMCCD, SNR, shot noise, dark current, readout noise, Clocking Induced Charge, Charge Transfer Efficiency.
AEPT, Geb. IC 1 / 49
Lehrstuhl für Allgemeine Elektrotechnik und Plasmatechnik
Ruhr-Universität Bochum
01.08.2006
     11:00
Prof. Dr. Markus Böttcher Ohio University, Athens, Physics and Astronomy
Simultaneous Broadband Observations and Modeling of the Blazars 3C66A and 3C279
Aushang
NB 7/67
Institut für Theoretische Physik IV Weltraum- und Astrophysik
Ruhr-Universität Bochum
07.08.2006
     11:00
Prof. Dr. Markus Böttcher Ohio University, Athens, Physics and Astronomy
High Energy Emission from the Microquasars LS 5039 and LSI +61 303
Aushang
NB 7/67
Institut für Theoretische Physik IV Weltraum- und Astrophysik
Ruhr-Universität Bochum
22.08.2006
     10:15
Prof. Dr. Don Ellison Department of Physics, North Carolina State University, Raleigh
!!!Achtung!!! Diese Veranstaltung fällt aus!
Aushang
NB 7/67
Institut für Theoretische Physik IV Weltraum- und Astrophysik
Ruhr-Universität Bochum
22.08.2006
     11:00
Prof. Dr. Richard Sydora University of Alberta, Canada
Nonlinear Evolution of Electron and Ion Beam Plasma Instabilities
Aushang
NB 7/173
Institut für Theoretische Physik I
Ruhr-Universität Bochum
12.09.2006
     10:15
Katherine Newton-McGee Univ. of Sydney/ATNF
Understanding Depolarisation Canals in the Southern Galactic Plane
Aushang
Measurements of the Galactic radio polarized background have revealed many complicated structures in the interstellar medium (ISM). Recently there has been an interest in the dark and narrow depolarization canals. I will present a study of a test region in the southern Galactic Plane taken with the Australian Telescope Compact Array (ATCA). ATCA is a radio synthesis telescope and these three regions were taken using a mosaicking technique at a range of frequencies around 1.4 and 1.7 GHz, at two different angular resolutions. At these frequencies the canals are ubiquitous in regions of strong polarization. The range of frequencies and resolutions combined with statistical analysis of the relevant Stokes parameters and position angle maps have led us to conclude that at these frequencies the majority of the canals are caused by differential Faraday rotation. It will be these canals that we are focusing on, rather than those caused by beam depolarization. We discuss the evidence that canals are contours following nulls in differential Faraday rotation by presenting rotation measure maps and analysis of the angular separation of the canals. We also present a new way of determining depolarisation canals by only studying polarisation angle and look at how this new method helps to understand depolarisation canals better.
Seminarraum Astronomie NA7/32

14.09.2006
     11:00
Prof. Dr. Marius S. Potgieter School of Physics and Unit for Space Physics, North-West University, Potchefstroom, Südafrika
COSMIC RAY ACCELERATION AND MODULATION CHALLENGES FROM
Aushang
The Voyager 1 spacecraft crossed the solar wind termination shock in December 2004 at a distance of 94 AU from the Sun. It has been observing the modulation of galactic and anomalous cosmic rays (ACRs) since 1978, and is now entering the inner heliosheath. So far this outer region of the heliosphere has provided several surprises and subsequent theoretical challenges as to how the ACRs is formed, accelerated and modulated, and what the modulation of galactic cosmic rays amounts to in this region. Several numerical models have been applied to this topic over the years and clear predictions have been made, thought to be based on reasonable assumptions. However, observational data indicate that the ACR source is not local to the shock region where Voyager 1 crossed into the heliosheath. The assumptions, predictions and challenges to cosmic ray modeling will be discussed.
NB 7/67
Institut für Theoretische Physik IV Weltraum- und Astrophysik
Ruhr-Universität Bochum
19.09.2006
     10:00
Dr. Jörgen Velin Department of Physics, Umea University, Umea, Sweden
Particle Fluid Simulation of Auroral Electrons
Aushang
NB 7/67
Institut für Theoretische Physik IV Weltraum- und Astrophysik
Ruhr-Universität Bochum
19.09.2006
     10:15
Dr. Katarzyna Otmianowska-Mazur Jagiellonian University Krakov / Poland
Cosmic ray driven dynamos in galactic disks: new results
Aushang
We present a further development of the first numerical model of the magnetohydrodynamical dynamo, driven by cosmic rays in the interstellar medium (Hanasz et al. 2004, ApJ, 605L, 33). The cosmic rays are produced in randomly occurring supernova remnants. Our model is described by equations of magnetohydrodynamics supplemented with the diffusion-advection equation governing the propagation of cosmic rays. The other essential elements of the model are: vertical gravity of the disk, differential rotation, and resistivity leading to reconnection of magnetic field lines. We obtain amplification of the large-scale magnetic field on a timescale of galactic rotation. The model represents a kind of fast, cosmic ray driven galactic dynamo proposed by Parker (1992). The amplification of the large-scale magnetic field results from the buoyancy of the cosmic ray component in the interstellar medium. We describe five models characterized by different resistivity magnitudes, CR supply rates and discuss in more detail a model with periodic SN activity, which mimics the presence of spiral arms in the disk. We find that both the resistivity and spiral arms enhance the efficiency of the CR dynamo. The timescale of magnetic field amplification is in this model as short as 140 Myr.
NA7/32

21.09.2006
     10:15
Prof. Mark Kushner College of Engineering, Iowa State University, Ames/USA
Controlling Reactive Fluxes During Plasma Processing for Microelectronics
Aushang
NABF 05/694
Institut für Experimentalphysik V
Ruhr-Universität Bochum
28.09.2006
     14:15
Prof. Dr. Jörg Schumacher Theoretische Strömungsmechanik, TU Ilmenau
Local dissipation scales in turbulence
Aushang
NB 7/165
Institut für Theoretische Physik I
Ruhr-Universität Bochum
17.10.2006
     14:15
Angela Busse MPI, IPP Garching
Relative dispersion of tracer particles in Navier-Stokes and MHD
Aushang
NB 7/173
Institut für Theoretische Physik I
Ruhr-Universität Bochum
24.10.2006
     15:00
Paul Hoess Paul Hoess KG, München
Noise performance comparison of ICCD with CCD and EMCCD cameras
Aushang
High quality imaging is a key parameter in many scientific applications. CCD and ICCD cameras have proven to be powerful tools and are consequently used in a wide range of fields such as engineering research and physical or biological sciences. The very new Electron Multiplying CCD technology seems now to provide the most sensitive detection capabilities. Here we compare analytically the signal-to-noise performance of the three systems and identify the most influencing parameters. The SNR provided by CCDs is strongly influenced by the readout noise and is also a significant function of the pixel rate. ICCD cameras are practically not at all affected by the CCD chip temperature and are shown to be mostly shot-noise-limited because readout and dark current noises are negligible. Therefore no cooling is needed for ICCDs. Although EMCCDs unite the quantum efficiency of CCDs and the gain of ICCDs, their performance is constricted by charge transfer and dark current noises which will be multiplied up along with the signal by the gain register. Therefore, EMCCDs must be strongly cooled (down to -70°C) and slowly read out in order to get rid of any unwanted “pseudo signal”. In addition, their properties limit exposure times to milliseconds time scales and longer. We conclude that ICCD cameras remain the most efficient systems in all gated experiments and perform very well in extreme low light situations. They still keep great advantages over standard CCDs and the new incoming generation of EMCCDs. Keywords: CCD, ICCD, EMCCD, SNR, shot noise, dark current, readout noise, Clocking Induced Charge, Charge Transfer Efficiency.
IC 1 / 161
Lehrstuhl für Allgemeine Elektrotechnik und Plasmatechnik
Ruhr-Universität Bochum
26.10.2006
     16:15
M.Sc. M. Cavarroc GREMI Universite Orleans
Dust particle formation and behaviour in silane-based plasmas
Aushang
NB 5 / 158
Institut für Experimentalphysik II Anwendungsorientierte Plasmaphysik
Ruhr-Universität Bochum
30.10.2006
     00:00
Symposium "Cosmic Plasma Physics"
Mehr
Symposium "Cosmic Plasma Physics" in Honour of Karl Schindler on the Occasion of his 75th Birthday
30. Oktober 12:15 Auditorium HNB
31. Oktober 09:00 Veranstaltungszentrum Mensa 04
HNB (Mo)
Veranstaltungszentrum Mensa (Di)

16.11.2006
     16:15
M.Sc. V. Land / Prof. W. Goedheer FOM Institute, Rijnhuizen
Simulation of void formation and interaction of UV radiation with dusty plasma
Aushang
NB 5/158
Institut für Experimentalphysik II Anwendungsorientierte Plasmaphysik
Ruhr-Universität Bochum
23.11.2006
     16:15
Dr. Irina Schweigert Insitut for theoretical and applied mechanics, Novosibirsk
Kinetic simulation of the effect of dust presence on the discharge properties
Aushang
NB 5/158
Institut für Experimentalphysik II Anwendungsorientierte Plasmaphysik
Ruhr-Universität Bochum
28.11.2006
     10:15
Dr. Michael Kramer Jodrell Bank Observatory / Univ. of Manchester
New discoveries giving insight in pulsar magnetospheric physics
Aushang
Recent discoveries of new, unknown classes of radio emitting neutron stars allow access to a much larger parameter space to study the conditions for the existence of radio emission. These new classes include the \"Rotating Radio Transients\" (RRATS) which outnumber the estimated Galactic population of radio pulsars by a factor of several, radio emitting magnetars, and pulsars which only emit radio emission for a week every month. In particular the last group allows us to test fundamental theories of pulsar magnetospheres proposed almost 40 years ago.
Seminarraum NA7/32
Astronomisches Institut
Ruhr-Universität Bochum
04.12.2006
     14:15
Dr. Victor P. Ruban Landau Institute for Theoretical Physics, Chernogolovka
Breathing rogue waves observed in numerical experiments
Aushang
Numerical simulations of the recently derived fully nonlinear equations of motion for long-crested water waves [V.P. Ruban, Phys. Rev. E 71, 055303(R) (2005)] with quasi-random initial conditions are reported, which show the spontaneous formation of a single extreme wave on the deep water. This rogue wave behaves in an oscillating manner and exists for a relatively long time (many wave periods) without significant change of its maximal amplitude. It is quite possible that such non-breaking, sub-extreme giant waves of large-but-moderate steepness occur in the ocean even more frequently than the highest, breaking freak waves of the same length. It should be emphasized that the oscillating behavior is not something unusual, but it is a common feature in dynamics of relatively short wave groups, as our second set of numerical experiments demonstrates. In the third set of numerical experiments, initially it was a plane wave, close to a Stokes wave, but with a very low-level random-phase perturbation added to the 2D Fourier spectrum. In this case the evolution had several distinctly different stages. The first stage was development of the Benjamin-Feir instability. The second stage was forming by wave groups of some random zig-zag pattern. The third stage was characterized by chaotization of the wave field and random appearing of freak waves. Such behavior has been observed for sufficiently large initial amplitudes: $ka>0.06$. However, with smaller initial amplitudes, $ka < 0.06$, the system was in a weakly nonlinear regime for all the time, and freak waves were not observed.
NB 7/173
Institut für Theoretische Physik I
Ruhr-Universität Bochum
05.12.2006
     10:15
Dr. Benedetta Ciardi Max-Planck Institute for Astrophysics, Garching
Cosmic reionization: theoretical modelling and upcoming observations
Aushang
With the advent in the near future of radio telescopes as LOFAR, PAST, MWA a new window on the high-redshift universe will be opened. In particular, it will be possible, for the first time, to observe the 21cm signal from the diffuse Intergalactic Medium (IGM) prior to its reionization and thus probe the \"dark ages\". In this talk I will critically discuss the theoretical modelling of IGM reionization and present results from numerical simulations. Finally, I will discuss the observability of the 21cm signal from the diffuse IGM.
NA7/32
Astronomisches Institut
Ruhr-Universität Bochum
 
 
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