Materials Literature
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The absorption of electromagnetic waves by a high mobility two-dimensional electron gas subjected to a magnetic field and a weak periodic potential is investigated. We show that the periodic modulation on the Laudau states has a profound effect on the absorption of electromagnetic waves. We develop a formalism which t…
The potential biomedical utility of the photoinduced destabilization of liposomes depends in part on the use of green to near infrared light with its inherent therapeutic advantages. The polymerization of bilayers can be sensitized to green light by associating selected amphiphilic cyanine dyes, i.e. the cationic 1,1'…
An “inverse micellar”- or “water-in-oil”-like (similar to the lyotropic type I II ) thermotropic body-centered cubic (BCC) liquid crystal (LC) phase was discovered in a poly(ethyleneimine) with a degree of polymerization (DP) = 20 containing 3,4,5-tri(dodecyloxy)benzoyl minidendritic side groups. Fiber X-ray diffracti…
NO adsorption on metal surfaces has been studied extensively due to its important role in many catalytic processes. In the past, it was recognized that the tendency for a metal surface to dissociate NO depends on its position in the periodic table, but little was understood about the dissociation process itself. Recen…
A new experimental technique was developed to identify crack paths with a resolution of nanometres in fibre-reinforced composites. Cracks were introduced through Vickers indentations on one side of the sample prior to starting the thinning process. Indentations were placed close to the fibres in order to get enough cr…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
The polarization mechanism of strengthening was studied in thermoplastic polymers filled with ultradisperse powders of refractory SiMeON compounds obtained by plasmachemical synthesis. Thermostimulated depolarization current measurements showed the presence of spontaneous polarization charge in the filler and in fille…
A decrease in the oxygen content in Nd 0.5 Ca 0.5 MnO 3−δ down to γ≤0.12 is shown to bring about a strong decrease in the magnetic field inducing a transition from the antiferromagnetic charge-ordered to the ferromagnetic charge-disordered state. The ferromagnetic phase in a Nd 0.5 Ca 0.5 MnO 2.92 sample is stable in…
Surface-aligned photo-oxidation of CO with O2 was demonstrated on two stepped surfaces, Pt(335) and Pt(779). UV light photolysis of O2, localized exclusively on step sites, generates reactive oxygen atoms which oxidize preferentially the step-site CO. This effect was observed by monitoring labeled-CO consumption from…
Mog1p binds the Ras-family GTPase Ran/Gsp1p, which has a central role in nucleocytoplasmic transport and cell-cycle progression. Overexpression of MOG1 is able to suppress temperature-sensitive gsp1 mutants in yeast; Deltamog1 null mutants display temperature-sensitive defects in nuclear trafficking. Orthorhombic crys…
We propose a microscopic model that is capable of describing the features of both deuterated and nondeuterated betaine phosphate (BP)--betaine phosphite (BPI) solid solutions in the region of small concentration of BP. The size mismatch between the BP and BPI structural units, which leads to a drastical change of the…
A personal computer (PC)-based simulator for nuclear-heating reactors (NHRs), PC-NHR, has been developed to provide an educational tool for understanding the design and operational characteristics of an NHR system. A general description of the reactor system as well as the technical basis for the design and operation…
Abstract The molecular structure of a reversible oxygen carrier, MoVIO(tmp)(O2) has been characterized by X-ray crystallography. Oxo and dioxygen ligands are actually coordinated with cis conformation, which leads to a saddle-like distortion of the porphyrin ring. The result of 2D ROESY shows the distortion of the por…
Ferroelectric properties of 9% mol (Hf, Zr) - doped BaTiO3 ceramics are studied by comparison with those of tetragonal pure BaTiO3 ceramics. A shift of the rhombohedral-orthorhombic and orthorhombic-tetragonal transition temperatures above 0°C and a decreasing of tetragonal-cubic transition temperature from 122°C to 9…
Ceramic chips of beryllium oxide were exposed to high energy heavy ion beams (He, C, Ne, Ar and Fe) and the glow curves were analysed. Two comparable peaks at around 203 oC and 355 oC were found and each peak height showed a different LET dependence. The low temperature peak height (IL) increased remarkably with LET t…
Bei der Neuuntersuchung des Phasendiagramms RbCl/PbCl2 mit differenzthermoanalytischen und röntgenographischen Methoden wurde die Bildung zweier ternärer, bisher noch nicht bekannter Phasen mit den Formeln Rb6Pb5Cl16 und Rb3PbCl5 gefunden, die beide in neuen Strukturtypen kristallisieren. Beide Phasen zersetzen sich p…
It is shown that steric interactions of volume substituents in the β-positions of pyrrole rings and the nitro group in mono-and di-meso-phenyl-substituted of octaethylporphyrins and their chemical dimers containing the electron-acceptor NO2 group in the ortho-position of the phenyl ring at 295 K favor the direct overl…
Electrochemical synthesis of polyaniline was carried out in aqueous sulfuric acid solutions of aniline on porous p- and n-silicon under galvanostatic, potentiostatic and potential pulse regimes. It is shown that the introduction of catalytic quantities of oxidants, potassium hexachloroiridate, potassium dichromate, po…
Ab initio Hartree-Fock molecular orbital calculations were applied to the crystalline imidazole and its derivatives in order to examine systematically the effect of possible N-H---N type hydrogen bond-ing on the nuclear quadrupole interaction parameters in these materials. The nitrogen quadrupole coupling constant (QC…
Abstract Blends of two precursor polymers, polyhydroxy amide (PHA) and poly(amic acid) (PAA), were studied using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The presence of PHA enhanced thermal and mechanical properties of the polyblends. All of the polyblended films showed large endo…