2,254 research outputs found
Stochastic Rotation Dynamics for Nematic Liquid Crystals
We introduce a new mesoscopic model for nematic liquid crystals (LCs). We
extend the particle-based stochastic rotation dynamics method, which reproduces
the Navier-Stokes equation, to anisotropic fluids by including a simplified
Ericksen-Leslie formulation of nematodynamics. We verify the applicability of
this hybrid model by studying the equilibrium isotropic-nematic phase
transition and nonequilibrium problems, such as the dynamics of topological
defects, and the rheology of sheared LCs. Our simulation results show that this
hybrid model captures many essential aspects of LC physics at the mesoscopic
scale, while preserving microscopic thermal fluctuations
Simulating broken -symmetric Hamiltonian systems by weak measurement
By embedding a -symmetric (pseudo-Hermitian) system into a large
Hermitian one, we disclose the relations between -symmetric
Hamiltonians and weak measurement theory. We show that the amplification effect
in weak measurement on a conventional quantum system can be used to effectively
simulate a local broken -symmetric Hamiltonian system, with the
pre-selected state in the -symmetric Hamiltonian system and its
post-selected state resident in the dilated Hamiltonian system.Comment: 4 pages; with Supplemental Materia
Effects of Ox-LDL on Macrophages NAD(P)H Autofluorescence Changes by Two-photon Microscopy
Ox-LDL uptakes by macrophage play a critical role in the happening of
atherosclerosis. Because of its low damage on observed cells and better
signal-to- background ratio, two-photon excitation fluorescence microscopy is
used to observe NAD(P)H autofluorescence of macrophage under difference
cultured conditions- bare cover glass, coated with fibronectin or
poly-D-lysine. The results show that the optimal condition is fibronectin
coated surface, on which, macrophages profile can be clearly identified on
NAD(P)H autofluorescence images collected by two-photon microscopy. Moreover,
different morphology and intensities of autofluorescence under different
conditions were observed as well. In the future, effects of ox-LDL on
macrophages will be investigated by purposed system to research etiology of
atherosclerosis.Comment: Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions
Pneumocystis jirovecii pneumonia manifesting as a lung abscess in a woman with systemic lupus erythematosus
- …