Materials Literature
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The effect of ? radiation on the electrical conductivity of polyaniline in the reduced, undoped and doped states has been studied. A model based on the oxidation of the polymeric chain combined with radiolysis of the absorbed water molecule has been proposed to explain the radiation-induced effects in this polymer. Th…
Magnetic phase transitions in Fe72Pt28 Invar compound studied by high-pressure X-ray magnetic circular dichroism and X-ray diffraction, S. Odin, F. Baudelet, Ch. Giorgetti, E. Dartyge, J. P. Itié, A. Polian, J. C. Chervin, S. Pizzini, A. Fontaine, J. P. Kappler
Technical Briefs On the Wave Diffusion and Parallel Nonequilibrium Heat Conduction M. Honner, M. Honner Mechanical Engineering Research, Skoda Vyzkum s.r.o., Tylova 57, CZ 31600 Plzen, Czech Republic e-mail: mhonner@vyz.ln.skoda.cz. Search for other works by this author on: This Site PubMed Google Scholar J. Kunes J.…
The Schwinger variational iterative method and the distorted-wave approximation are combined to study elastic electron scattering by ${\mathrm{O}}_{2}$ for incident energies ranging from 5 to 500 eV. Differential, integral, and momentum transfer cross sections as well as polarization fractions are reported. A complex…
A theory of Raman scattering of light by acoustic phonons in spherical nanocrystals of zinc-blende and wurtzite semiconductors has been developed with the inclusion of the complex structure of the valence band. The deformation-potential approximation was used to describe the exciton-phonon interaction. It is shown tha…
The formation of propylene oxide from propene by direct oxidation with air has been studied with a series of new microporous amorphous catalysts containing isolated active sites. Although the materials showed good activities as heterogeneous oxidation catalysts, the formation of acroleine dominated in the gas phase. O…
Fine structures of the copper oxide clusters involved in catalytic reduction of NO were studied by X-ray absorption spectroscopy. The Extended X-ray absorption fine structural (EXAFS) spectra indicate that about 2.89 nearest oxygen atoms bond to the Cu central atoms with a Cu−O bond distance of 1.96 Å for the oxidized…
The dosimetric properties are presented of a recent production of chemical vapour deposition diamond growth. Experimental data concerning the TL response as a function of dose, the energy response and fading behaviour are reported. Very preliminary results suggest that diamond can be used in TL mode as well as an acti…
The experimental equilibrium phase diagram of a mixture of linear polystyrene of molecular weight Mw = 44,000 g/mol and 4-cyano-4′-n-octyl-biphenyl (8CB) is established. The three transitions smectic A-nematic, nematic-isotropic, and isotropic-isotropic are observed. The first two are observed both by optical microsco…
A kinetic Monte Carlo simulation of dislocation motion is introduced. The dislocations are assumed to be composed of pure edge and screw segments confined to a fixed lattice. The stress and temperature dependence of the dislocation velocity is studied, and finite-size effects are discussed. It is argued that surfaces…
Intense optically stimulated luminescence (OSL) is observed, for the first time, in X irradiated KBr:Eu and KC1xBr1 - x:Eu phosphor ceramics. The peak in the stimulation spectrum for the OSL red-shifted with increasing Br content of KC1xBr1 - x:Eu phosphor ceramics. The intensity of the OSL with a peak of about 420 nm…
Part I of this series reports on the psychophysical relationship between the subjective perception of bagging and the residual bagging height. Subjective perception is mainly influenced by residual bagging height, accounting for 94% of all variations. In Part II, we investigate the physical mechanism of fabric bagging…
The high dielectric constant of perovskite-type alkaline earth titanates makes them attractive for use in integrated thin film capacitors for microwave circuits. The application temperatures of those devices such as resonators, filters and phase shifters range from cryogenic temperatures for superconducting devices up…
Syntheses and mesomorphic properties of dimesogens incorporating dissimilar mesogenic units viz. cholesterol and substituted biphenyls are reported.
The mechanism of catalytic chain transfer polymerization with methyl methacrylate was studied in a range of media. The chain transfer reaction in supercritical CO 2 was found to be significantly enhanced compared with similar experiments in toluene or in bulk methyl methacrylate. The results are consistent with a diff…
Microstructural evolution in poly(ethylene terephthalate) during a stretch– blow process has an important influence on the final mechanical prop erties. To obtain information other than thickness distributions from numerical simulations of the blow moulding process, it is necessary to take into account the evolution o…
After summarizing ferroelectric and antiferroelectric liquid crystals (LCs) in liquid crystals so far discovered, two materials exhibiting a proper ferroelectricity are reported; (1) polar order in nematic LC of aromatic polyesters and (2) ferroelectric switching in a lyotropic liquid crystal of polypeptide. In the po…
Abstract New gelators based on benzenedicarboxylic acid were synthesized, and their gelation abilities were clarified. N,N′-Terephthaloyl-bis(l-valylaminooctadecane) was especially an excellent gelator to harden a wide variety of organic fluids. The strength of gel markedly increased with addition of commercially avai…
Abstract In order to show the significance of plastic recycling, a study of the properties of blends of PP with non‐recycled and recycled high density polyethylene (HDPE) is made. The results of the Young's modulus for polypropylene (PP)/non‐recycled and recycled HDPE blends present a slight synergism, although no sig…
We have been requested to prepare a rather unusual article for this special publication. The article should be not only autobiographical in nature but should also have historical perspectives and critique and should contain some element of visionary forecast. Undoubtedly, the idea is unique and challenging though may…