Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Crack bifurcation was observed in laminar ceramic composites when cracks entered thin Al 2 O 3 layers sandwiched between thicker layers of Zr(12Ce)O 2 . The Al 2 O 3 layers contained a biaxial, residual, compressive stress of ∼2 GPa developed due to differential contraction upon cooling from the processing temperature…
The evolution of structural and magnetic properties of small chromium clusters towards the bulk is elucidated through a systematic density functional study. A tightly bound C${\mathrm{r}}_{2}$ dimer is found to play a key role in determining the cluster structures. A unique dimer growth route is discovered for cluster…
The ability of some microorganisms to use lactic acid stereocopolymers and copolymers with glycolic acid as sole carbon and energy sources was studied under controlled or natural conditions. First, 14 filamentous fungal strains were tested in liquid cultures, adopting total lactic acid consumption, nitrogen source exh…
A review is given of the optical properties of isotropic chiral media, based on the symmetrized constitutive relations of Condon. The review includes discussion of wave propagation in chiral media, and derivation of the reflection and transmission amplitudes of an isotropic optically active medium, and of a layer rest…
Factors affecting stacking fault formation during the synthetic fabrication of β‐SiC were investigated in the present study. Two main reaction routes in the carbothermal reduction of SiO 2 —solid–solid and solid‐gas reactions—led to the formation of β‐SiC, depending on the vapor pressure of the SiO gas. The β‐SiC form…
The outstanding feature of a diatom is the species-specific design and ornamentation of the silica-based cell wall, termed frustulum. A new frustulum is shaped in a specialized organelle (silica deposition vesicle) and secreted. Proteins in the lumen of this organelle may control the biomineralization process and are…
Abstract Thermoplastic elastomers (TPEs) exhibit the functional properties of conventional thermoset rubber, yet can be processed on thermoplastic fabrication equipment. The great majority of TPEs have hetero-phase morphology, whether the TPE is derived from block copolymers, rubber-plastic compositions or ionomers. G…
An approach to the synthesis of a new class of liquid crystalline (LC) compounds, dendrimers of regular structure with terminal mesogenic groups, was elaborated. LC dendrimers based on the carbosilane dendritic matrix of first generation were synthesized. Cyanobiphenyl, methoxyphenyl benzoate and cholesteryl groups we…
An extended photoluminescence (PL) study of porous silicon is presented. Different PL techniques have been used: continuous wave excited (cw) PL, selectively excited PL, excitation spectroscopy of the PL, time decay of the PL, and time resolved PL. These measurements have been performed on a set of samples of various…
This paper presents a new time domain controlled voltage source (CVS) model for an arc furnace using the Electro Magnetic Transients Program (EMTP). The developed model is based on a piecewise linear approximation of the V-I characteristic of the arc furnace load. In addition to this, the novelty of this simulation te…
No abstract available.
Supercritical drying of gels yields amorphous aerogels (ARG) that serve as reversible, high capacity hosts for lithium ion intercalation. We have found that ARG material consists of a highly interconnected solid network that has a surface area up to 450 m 2 /g and a specific pore volume of 2.3 cm 3 /g. The material ho…
Des echantillons de sediments superficiels, destines a l'analyse des diatomees ainsi qu'a celle de la chimie de l'eau et a la recherche d'autres donnees limnologiques, ont ete preleves dans 113 lacs d'eau douce,et d'eau salee du Plateau interieur du sud et du Sillon des Rocheuses du Sud en Colombie-Britannique, et les…
An analytical model for polarizability dyadics of small chiral conductive particles in free space or those embedded in a lossy material is presented and discussed. Chiral particles are modeled by a wire loop connected to two straight wire elements. The electromagnetic analysis is based on the replacement of the partic…
Inelastic x-ray scattering data from water at $5\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ show a variation of the velocity of sound from 2000 to 3200 $\mathrm{m}/\mathrm{s}$ in the momentum transfer range $1--4{\mathrm{nm}}^{\ensuremath{-}1}$. The transition occurs when, at $\ensuremath{\approx}4\mathrm{meV}$, th…
Electric field orientation of carbon nanotubes has been demonstrated using electrophoresis in isopropyl alcohol. The carbon nanotubes move towards the cathode during this process. The nanotubes align along the electric field due to the anisotropy of their electrophoresis velocity. The mobility has been estimated to be…
The growth of bulk crystals of organic salts with large chromophoric has received little attention, despite the importance of crystal quality for both applications and research. Here, the growth of the title compound (DAST), see Figure, is reported and the main results of the linear, nonlinear, and electro‐optical cha…
A thorough sequence analysis of the various members of the eukaryotic protein serine/threonine phosphatase 2C (PP2C) family revealed the conservation of 11 motifs. These motifs could be identified in numerous other sequences, including fungal adenylate cyclases that are predicted to contain a functionally active PP2C…
The effect of a postdeposition anneal on the structure and dielectric properties of epitaxial BaxSr1−xTiO3 (BST) thin films (x=0.35–0.65) have been measured. The films were grown by pulsed laser deposition on LaAlO3 (001) substrates. The films were single phase and (001) oriented with a lattice parameter larger than t…
Structurally similar but sequentially unrelated proteins have been discovered and rediscovered by many researchers, using a variety of structure comparison tools. For several pairs of such proteins, existing structural alignments obtained from the literature, as well as alignments prepared using several different simi…