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。
The temperature dependency of the dynamic moduli of elasticity of steel and aluminum and copper alloys was investigated experimentally by an ultrasonic-wave method, in the temperature range from —196 to 1000°C. The results are compared with those obtained by the resonant-frequency method and are represented as empiric…
The cyanobiphenyl compounds 5CB (4-cyano-4'- n -pentyl-biphenyl) and the corresponding hexyl, 6CB, and heptyl, 7CB, form a homologous series of nematic liquid crystals. The flow of these liquid crystals in a torsional shear flow apparatus was studied. The shear induced alignment of the director field gives a correspon…
Polymerization of aluminium(III) and iron(III), in mixed solutions of the nitrates, by dialysis against distilled water resulted in polycations having higher Fe/(Fe+Al) mole ratios than those of the starting solutions. A maximum of 25 mole per cent aluminium(III) entered probably into the structure of the po1y[Fe(III)…
Experimental measurements of yarn torque made on statically twisted continuous-filament and staple-fibre yarns are presented. The torque–twist and recovery characteristics of the yarns are interpreted in the light of the theoretical analyses derived in Part I of this series, and it is shown that the torque generated i…
Given a vector field defined in a volume enclosed by a boundary, it is possible to predict the total index of point singularities of the vector field within the volume if it satisfies specified conditions on the boundary. This is made precise in a mathematical theorem, and its applications to physical systems, especia…
The long-term properties of commercially available ECG-electrodes were studied by investigating the parameters: polarization potential, electrical impedance, adhesion, and skin reactions during a period of 7 days. As expected, the most stable polarization potentials were obtained for Ag/AgCl electrodes. Certain simple…
Abstract The kinetics of the pit nucleation in iron in borate buffer solution containing bromides and iodides (0.01 n–0.5 n) has been investigated, and the results have been compared with those obtained for chloride solutions. It has been found that the critical pitting potential, E cp , decreases linearly with the lo…
Measurements of the line shape of the silicon optic mode in boron-implanted ruby-laser-annealed silicon were analyzed assuming a Fano-type interaction between the discrete optic mode and the continuous valence band states. The results yielded a utilization coefficient of 0.89±0.09 for the boron impurities. Measurement…
The heat-ipsulation characteristics of eighteen fire-retardant-treated fabrics; two Nomex fabrics, and a Kynol fabric are examined. Exposure both to flame and to radiation sources is employed. For a low level of radiation exposure, fabric thickness correlates well with protection time. As incident heat flux is increas…
A ferroelastic phase change is observed in P${\mathrm{b}}_{3}$${(\mathrm{P}{\mathrm{O}}_{4})}_{2}$ near 20 kbar at ambient temperature by neutron diffraction. The rhombohedral $\ensuremath{\beta}$ phase above the transition pressure shows a domain-size broadening similar to that observed in the $\ensuremath{\beta}$ ph…
Orientational ordering in the cholesteric liquid crystal is investigated theoretically by assuming the intermolecular force as the sum of a repulsion of hard-core with shape of twisted rod and of dispersion forces of Maier-Saupe type and of Goossens type. A method of symmetry breaking potential is applied to obtain th…
Abstract An experimental study of the solution properties of poly( m ‐phenyleneisophthalamide) (MPD‐I) in dimethylacetamide (DMA)/LiCl solutions is presented. Differential refractometry, light scattering photometry, dilute and concentrated solution viscometry, and normal stress experiments are reported and interpreted…
The static field breakdown and corona characteristics of SF6-N2 mixtures in non-uniform field gaps for applied voltages of positive and negative polarities are discussed. Mixtures containing 0 to 100% SF6 are studied over a pressure range of 100 to 500 kPa. The results show that for such gaps, the dielectric behavior…
Abstract Pure silicon carbide and silicon nitride have valuable properties in bulk pore‐free form; however, their industrial exploitation has hardly been possible so far. Neither compound can be melted or sintered in pure form; hot pressing or sintering at normal pressure requires the presence of additives; and the re…
Compact as possible difference schemes for systems of nth order equations are developed. Generalizations of the Mehrstellenverfahren and simple theoretically sound implementations of deferred corrections are given. It is shown that higher order systems are more efficiently solved as given rather than as reduced to lar…
The study of moisture induced aluminium corrosion in the presence of passivation layers and plastic encapsulants has shown that the corrosion rate is determined by the surface conductivity of the water layer that forms on the die surface. The surface conductivity is determined by the external environment and the adhes…
The torque generated during yarn-twisting is considered to have three components, due, respectively, to fibre torsion, fibre-bending, and the internal fibre tensile and compressive stresses within the yarn. An analysis of the yarn torque generated by fibre torsion will be given in a later paper, and the component due…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron paramagnetic resonance investigation of copper(II) complexes with reversed g values in A and Y zeolitesRichard G. HermanCite this: Inorg. Chem. 1979, 18, 4, 995–1000Publication Date (Print):April 1, 1979Publication History Published online1 May 2002Published inissue…
To understand the extent of the cross-linking of proteins by the bifunctional reagent p-NN'-phenylenebismaleimide, a quantitative study of competing reactions has been undertaken. The two reactive maleimide rings of the bismaleimide are hydrolysed in mildly alkaline aqueous solutions much more rapidly than is the sing…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrito-nitro linkage isomerization in the solid state. 1. X-ray crystallographic studies of trans-bis(ethylenediamine)(isothiocyanato)nitrito- and trans-bis(ethylenediamine)(isothiocyanato)nitrocobalt(III) perchlorate and iodideIngmar Grenthe and Ellika NordinCite this: Ino…