TY  - JOUR
A1  - St-Louis, N.
T1  - Studying Large and Small Scale Wind Asymmetries with Spectroscopy and Polarimetry
JF  - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015
N2  - In this paper, I review observational evidence from spectroscopy and polarimetry for the presence of small and large scale structure in the winds of Wolf-Rayet (WR) stars. Clumping is known to be ubiquitous in the winds of these stars and many of its characteristics can be deduced from spectroscopic time-series and polarisation lightcurves. Conversely, a much smaller fraction of WR stars have been shown to harbour larger scale structures in their wind (∼ 1/5) while they are thought to be present is the winds of most of their O-star ancestors. The reason for this difference is still unknown.
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87726
SP  - 79
EP  - 84
ER  - 
TY  - JOUR
A1  - Cherstvy, Andrey G.
A1  - Chechkin, Aleksei V.
A1  - Metzler, Ralf
T1  - Particle invasion, survival, and non-ergodicity in 2D diffusion processes with space-dependent diffusivity
JF  - Soft matter
N2  - We study the thermal Markovian diffusion of tracer particles in a 2D medium with spatially varying diffusivity D(r), mimicking recently measured, heterogeneous maps of the apparent diffusion coefficient in biological cells. For this heterogeneous diffusion process (HDP) we analyse the mean squared displacement (MSD) of the tracer particles, the time averaged MSD, the spatial probability density function, and the first passage time dynamics from the cell boundary to the nucleus. Moreover we examine the non-ergodic properties of this process which are important for the correct physical interpretation of time averages of observables obtained from single particle tracking experiments. From extensive computer simulations of the 2D stochastic Langevin equation we present an in-depth study of this HDP. In particular, we find that the MSDs along the radial and azimuthal directions in a circular domain obey anomalous and Brownian scaling, respectively. We demonstrate that the time averaged MSD stays linear as a function of the lag time and the system thus reveals a weak ergodicity breaking. Our results will enable one to rationalise the diffusive motion of larger tracer particles such as viruses or submicron beads in biological cells.
KW  - anomalous diffusion
KW  - intracellular-transport
KW  - adenoassociated virus
KW  - infection pathway
KW  - escherichia-coli
KW  - endosomal escape
KW  - living cells
KW  - trafficking
KW  - cytoplasm
KW  - models
Y1  - 2014
U6  - https://doi.org/10.1039/c3sm52846d
SN  - 2046-2069
VL  - 2014
IS  - 10
SP  - 1591
EP  - 1601
PB  - Royal Society of Chemistry
ER  - 
TY  - JOUR
A1  - Mondal, Suvendu Sekhar
A1  - Bhunia, Asamanjoy
A1  - Kelling, Alexandra
A1  - Schilde, Uwe
A1  - Janiak, Christoph
A1  - Holdt, Hans-Jürgen
T1  - A supramolecular Co(II)₁₄-metal–organic cube in a hydrogen-bonded network and a Co(II)–organic framework with a flexible methoxy substituent
JF  - Chemical communications : ChemComm
N2  - The reaction of 4,5-dicyano-2-methoxyimidazole (L1) with Co(NO3)2·6H2O under solvothermal conditions in DMF, a MOF, IFP-8 and a hydrogen-bonded network consisting of tetradecanuclear Co(II)14-metal organic cube (1) are achieved. 1 shows the bcu net with 14 cobalt atoms.
KW  - zinc
Y1  - 2014
U6  - https://doi.org/10.1039/c3cc49698h
SN  - 2046-2069
VL  - 2014
IS  - 41
SP  - 5441
EP  - 5443
PB  - Royal Society of Chemistry
ER  - 
TY  - JOUR
A1  - Mickelsson, Jouko
A1  - Paycha, Sylvie
T1  - The logarithmic residue density of a generalized Laplacian
JF  - Journal of the Australian Mathematical Society
N2  - We show that the residue density of the logarithm of a generalized Laplacian on a closed manifold definesan invariant polynomial-valued differential form.  We express it in terms of a finite sum of residues ofclassical pseudodifferential symbols. In the case of the square of a Dirac operator, these formulas providea pedestrian proof of the Atiyah–Singer formula for a pure Dirac operator in four dimensions and for atwisted Dirac operator on a flat space of any dimension.  These correspond to special cases of a moregeneral formula by Scott and Zagier.  In our approach, which is of perturbative nature, we use either aCampbell–Hausdorff formula derived by Okikiolu or a noncommutative Taylor-type formula.
KW  - residue
KW  - index
KW  - Dirac operators
Y1  - 2011
U6  - https://doi.org/10.1017/S144678871100108X
SN  - 0263-6115
SN  - 1446-8107
VL  - 90
IS  - 1
SP  - 53
EP  - 80
PB  - Cambridge Univ. Press
CY  - Cambridge
ER  -