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。
Greek.- Numeric.- Tables.- 1a. Standard (based on ISO and ASTM) abbreviations of plastics.- 1b. Standard (based on ISO and ASTM) abbreviations of rubbers.- 2a. Letters used to modify abbreviations for plastics (ISO and ASTM).- 2b. Commonly-used letters used to modify abbreviations for plastics (i.e. in addition to Tab…
Abstract During our years in high school, we have all been taught that matter only exists in three states: solid, liquid, and gas. However, this is not quite correct. In particular, certain organic materials do not show a single transition from solid to liquid, but rather a cascade of transitions involving new phases.…
Se describe una comunidad de algas fotófilas mediterráneas de modo calmado dominada por Hatopteris scoparia y otros feófitos de porte mediano, la cual se adscribe a la asociación Padino-Clodostephetum hirsutae J. Feldmann 1937. Dicha asociación se caracteriza por la ausencia de un estrato elevado de Fucales y el escas…
Abstract The helical arrangement characteristic of the cholesteric phase has been presented in Chapter 1. In this ideal state the director n(r) varies in space according to the law where we have taken the helical axis along z. A cholesteric single crystal, described by eqns (6.1) and (6.2), can often be obtained in th…
Abstract This new edition of this classic text on condensed matter physics includes the great advances that have taken place since its first publication in 1974. New chapters describe the main types and properties of liquid crystals in terms of the new phases discovered since the middle of the 1970's, and advances in…
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…
A review of the rigorous coupled-wave analysis (RCWA) as applied to the diffraction of electromagnetic waves by gratings is presented. The analysis is valid for any polarization, angle of incidence, and for conical diffraction. Cascaded and/or multiplexed gratings as well as material anisotropy and loss can be incorpo…
The influence of hardness and topology of substrate surface on the pretilt angle were investigated for a slightly tilted homeotropic alignment achieved by the rubbing technique. On a soft surface, the grooves are produced which align in the same direction as the rubbing direction while the liquid crystal molecules til…
This letter reports the lowest coefficient of friction measured for diamond sliding on diamond. When a natural diamond stylus with a spherical tip about 50 μm in diameter slides on a polished polycrystalline chemically vapor deposited diamond film in water at a speed of 0.05 mm/s under a load of 50 g, the coefficient…
Individual two-state and multistate fluctuators were found in the broadband noise in the sliding charge-density--wave (CDW) state of small samples of ${\mathrm{NbSe}}_{3}$. In the presence of dc currents, some multistate fluctuators violate detailed balance. Fluctuator properties show strong dependences on bias. As th…
Through measurements of the near-edge Ce L3 x-ray absorption structure we have investigated the influence of site volume on the cerium valence in Ce2Fe14B, Ce2Fe14BHx, and Ce2Fe17. The crystal structures of these compounds are isomorphic with those of technologically important permanent magnet materials. Confirming ot…
The interaction of C with Ni(100) has been studied by scanning tunneling microscopy (STM). The C atoms, imaged as \ensuremath{\approxeq}0.3 \AA{} deep depressions consistent with theoretical predictions, are at low C coverages located in the fourfold hollow sites, causing a small radial displacement of the surrounding…
Ferroelectric Pb0.9La0.1Zr0.2Ti0.8O3 thin film capacitors with a symmetrical La-Sr-Co-O top and bottom electrodes have been grown on [001] Si with yttria stabilized zirconia (YSZ) buffer layer. A layered perovskite ‘‘template’’ layer (200–300 Å thick), grown between the YSZ buffer layer and the bottom La-Sr-Co-O elect…
Lateral superstructures with honeycomb symmetry are shown to be classified, with a simple criterion, into semimetals with gapless k-linear dispersions, semiconductors, and metals. In some of the classes, the symmetry enforces flat bands to exist, which implies the occurrence of ferromagnetism when the electron correla…
A nonmechanical approach to the construction of complex three-dimensional interconnect arrays has been developed with the use of conducting polymer dendrites. Electrically independent connections between pairs of wires in an array were successfully grown through alternating-current electrochemical polymerization of po…
Light emission from molecular layers has been induced by inelastically tunneling electrons in a tunneling junction. The fast quenching of molecular emission on metal surfaces was suppressed by use of the "transparent conductor" indium-tin-oxide for the junction electrodes. The emission measurements have been made in s…
A model of the desorption and adsorption of a polymer layer at a planar surface indicates a transition from exponential kinetics at high temperatures to nonexponential kinetics (stretched exponential with index one-half) at lower temperatures where these processes are diffusion-limited. Measurements of polystyrene des…
Rare earth-doped glasses exhibit high initial photosensitivity but their response saturates at relatively modest values of (Delta) n (approximately 5 X 10<SUP>-7</SUP>), which greatly limits their usefulness for device applications. In the context of our model, saturation results from either exhaustion of photosensiti…
Abstract Polyesters were obtained from castor oil and dibasic acids for example, malonic, succinic, glutaric, adipic, suberic, and sebacic acids. These prepolyesters were characterized by infrared spectrometry, viscosimetric measurements, and molecular weight determinations (GPC). These prepolyesters were mixed with m…
Abstract The yield stress of polyacetal (POM) decreases monotonically with the incorporation of thermoplastic polyurethane (TPU) elastomer in POM/TPU blends as would be anticipated. However, the impact strength of the resultant POM/TPU blends increases initially up to 30% TPU and thereafter decreases with the addition…