81 research outputs found
Influence of the adsorption energy on the dielectric contribution to the anchoring energy of nematic liquid crystals
External and intrinsic anchoring in nematic liquid crystals: A Monte Carlo study
We present a Monte Carlo study of external surface anchoring in nematic cells
with partially disordered solid substrates, as well as of intrinsic anchoring
at free nematic interfaces. The simulations are based on the simple hexagonal
lattice model with a spatially anisotropic intermolecular potential. We
estimate the corresponding extrapolation length by imposing an elastic
deformation in a hybrid cell-like nematic sample. Our estimates for
increase with increasing surface disorder and are essentially
temperature--independent. Experimental values of are approached only when
both the coupling of nematic molecules with the substrate and the anisotropy of
nematic--nematic interactions are weak.Comment: Revisions primarily in section I
Remarks on expansion and factorization approximation in the Tsallis nonextensive statistical mechanics
The validity of (1-q) expansion and factorization approximations are analysed
in the framework of Tsallis statistics. We employ exact expressions for
classical independent systems (harmonic oscillators) by considering the
unnormalized and normalized constrainsts. We show that these approxiamtions can
not be accurate in the analysis of systems with many degrees of freedom.Comment: Latex, 6 pages, 2 figure
Physicochemical properties and antioxidant capacity of propolis of stingless bees (Meliponinae) and Apisfrom two regions of Tocantins, Brazil
Plasminogen activator inhibitor 1 and Antipain preserve acrosome integrity of bovine spermatozoa during cryopreservation
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