Results 201 to 210 of about 34,079 (254)
Some of the next articles are maybe not open access.
Optical anisotropy of polyisobutene
Polymer, 1976Abstract The distribution of chemical bonds in polyisobutene results in a theoretically zero optical and electrical anisotropy of the polymer according to bond polarizability additivity principles as conventionally applied, irrespective of polymer chain conformation. Non-zero values of the segmental anisotropy (∼4.4 × 10 −40 C 2 m 2 /J) derived from
J.V. Champion +4 more
openaire +1 more source
Optical anisotropy of nanotube suspensions
The Journal of Chemical Physics, 2004A semimacroscopic model of an optically anisotropic nanotube suspension is derived perturbatively from Maxwell’s equations in a dielectric medium. We calculate leading-order expressions, valid in the dilute and semidilute limits, for the intrinsic and form contributions to the complex dielectric tensor in terms of the volume fraction, mean orientation,
openaire +2 more sources
Effects of anisotropy in inhomogeneous optical fibers
Radio Science, 1977An approximate computer technique investigates wave propagation along radially inhomogeneous anisotropic fibers. The electromagnetic field components are determined by numerical integration across thin concentric tubes within the fiber core. The continuity of tangential components at the tube boundaries yields a dispersion relation for the propagation ...
Parriaux, O. +2 more
openaire +1 more source
Optical anisotropy of ellipsoidal quantum dots
Physical Review B, 2002The optical properties of anisotropic quantum dots with ellipsoidal shape are investigated and discussed as a function of the dot aspect ratio. The energy spectrum ~ground and many excited states! is calculated and analyzed in comparison with the spherical quantum dot. The optical matrix elements in the dipole approximation and the oscillator strengths
Cantele G +4 more
openaire +5 more sources
Optical Anisotropy of Polycarbonates
1988The large optical anisotropy of bisphenol-A polycarbonate is mainly caused by the presence of the anisotropically polarising phenyl groups all located in the polymer backbone. By introducing an aromatic group in the polymer side-chain via the bisphenol-moiety we have tried to increase the perpendicular polarisability to obtain a smaller anisotropy of ...
G. H. Werumeus Buning +3 more
openaire +1 more source
Optical Anisotropy in Films of Photoaddressable Polymers
Macromolecules, 1999The photoinduced anisotropy in polymers and copolymers with a mesogenic and a nonmesogenic azobenzene moiety in the side chain were investigated. The results of the light-induced optical anisotropy study in thin films obtained by means of polarized UV−vis and IR absorption spectroscopy are presented.
Cimrová, V. +3 more
openaire +3 more sources
Optical anisotropy in InAs/AlSb superlattices
Physical Review B, 1994The optical anisotropy in the layer plane of (100) InAs/AlSb superlattices was investigated by ellipsometry and by reflection difference spectroscopy. The superlattices are anisotropic in the (100) plane with the dielectric function along the [011] and [011\ifmmode\bar\else\textasciimacron\fi{}] axes differing by as much as \ensuremath{\sim}5% in the ...
, Santos +4 more
openaire +2 more sources
Mechanical and optical anisotropy of bovine pericardium
Medical & Biological Engineering & Computing, 1992A Moiré fringe method was used to determine the shape of inflated disks of fresh bovine pericardium. The results suggested that the tissue was anisotropic and allowed the identification of the directions of the axes of elastic symmetry. Quantitative biaxial inflation and simple tension tests confirmed the anisotropy.
P, Zioupos, J C, Barbenel, J, Fisher
openaire +2 more sources
Journal of Physics C: Solid State Physics, 1975
Normal-incidence reflectivity spectra of layer-type beta -GaSe crystals have been measured for E perpendicular to c as well as E//c at 78K. A strong anisotropy in the selection rules for interband transitions has been observed and a suitable energy level scheme is proposed.
openaire +1 more source
Normal-incidence reflectivity spectra of layer-type beta -GaSe crystals have been measured for E perpendicular to c as well as E//c at 78K. A strong anisotropy in the selection rules for interband transitions has been observed and a suitable energy level scheme is proposed.
openaire +1 more source
Induced optical anisotropy in heterodispersed systems
Applied Optics, 1980Magnetically induced extinction and birefringence of systems containing a mixture of ultramicroscopic particles with different optical and magnetic properties have been theoretically investigated. It is shown that the effects may exhibit an extremum and an inversion in sign with increasing applied field strength if the system contains diamagnetic as ...
D M, Bhagat, R V, Mehta, H S, Shah
openaire +2 more sources