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 properties of many sulfide and selenide glasses correspond closely to related oxide systems; this correspondence can be correlated with the ratios of the valences and of the radii of the anions and cations. The analogy of chalcogenides to oxides in phase separation behavior is striking. Systematic substitutions pr…
Abstract Kaolinite, illite, chlorite, montmorillonite, and vermiculite are among the most important of the clay minerals. Cations are embedded between the silicate layers and on the basal faces of the crystals. Whereas only the cations on the outer faces are exchangeable in the first three of the above minerals, those…
The crystal structure of ferberite has been determined and refined by projections to R values of 7.2% for hk 0 reflections and 5.4% for h 0 l reflections. The structure is based on W and Fe octahedra forming infinite zig-zag chains in the direction of the c axis. Each chain contains just one type of cation and each oc…
A preliminary physical and chemical examination of a selected group of spider silks was made. The program's ultimate goal was the synthesis of 'super tenacity' protein fibers, and the work reported here was designed to: confirm the existence of very strong, natural protein fibers, specifically, spider silks; determine…
An analysis has been made of the geometrically similar tests of bias extension and sim ple shear for plain-woven fabrics. This analysis makes possible calculation of the values of the equivalent shear strain and equivalent shear stress, corresponding to measured values of tensile strain and tensile stress in bias exte…
Abstract The character and magnitude of traveling discontinuities in one-dimensional coupled transient thermoelastic problems are studied. For this purpose, 16 different fundamental problems are considered in detail, by examination of the nature of the solutions in the Laplace-transform domain. These problems correspo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEstimation of the critical surface tension for polymers from molecular constitution by a modified Hildebrand-Scott equationSouheng WuCite this: J. Phys. Chem. 1968, 72, 9, 3332–3334Publication Date (Print):September 1, 1968Publication History Published online1 May 2002Publis…
Abstract A comparative study of the reactivity of hydroxide and various alkoxide anions was made by determining percentage weight loss of poly(ethylene terephthalate) fiber. Regardless of the basicity of the anions, the order of reactivity was found to be hydroxide < tert ‐butoxide < sec ‐propoxide < methoxid…
During the last stage of sintering of ZnO, a decrease in bulk density is accompanied by an increase in pore size and a decrease in the number of pores. Examination of the microstructures indicated that the pores are almost always situated at the grain boundaries and at the corners. The dominant pore size increases wit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid crystals. II. Effects of terminal group substitution on the mesomorphic behavior of some benzylideneanilinesJoseph A. Castellano, Joel E. Goldmacher, Lucian A. Barton, and Jean S. KaneCite this: J. Org. Chem. 1968, 33, 9, 3501–3504Publication Date (Print):September 1,…
Abstract This paper reports on three investigations into the toxic potential of plastics, resins and addivtives, with emphasis on those having medical, dental, or pharmaceutical application. The following points were noted: (1) two different lots of PVC resin contained toxic material which was leachable into a biologi…
Parawollastonite crystallizes in space group P 2 1 / a with following cell dimensions: a = 15.426 Å, b = 7.320 Å, c = 7.066 Å, and β = 95°24′15″. M amedov and B elov 's coordinates for wollastonite, as referred to a doubled monoclinic cell, were used to compute a preliminary set of structure factors for parawollastoni…
Diffusion of the radioactive tracer 22 Na in a commercial SiO 2 glass was investigated from 170° to 1000°C. The temperature dependence curve had discontinuities at about 573° and 250°C. The resulting Arrhenius equations are D = 3.44 × 10 2 exp(‐21.1 kcal/RT) cm 2 /sec between 1000° and 573°C, D = 0.398 exp(‐25.8 kcal/…
Extension of an earlier theory of Hertzian fracture in brittle isotropic materials is here made to include the case of brittle single crystals, with particular reference to crystals having the diamond structure. A detailed description is first given of the inhomogeneous stress field in a flat, elastic specimen loaded…
The crystal structure of valleriite has been determined to consist of alternate interlayering of layers of two kinds: a brucite-like layer of composition [Mg .68 Al .32 (OH) 2 ]; and a novel sulfide layer of composition [Fe 1.07 Cu .93 S 2 ]. The sulfide layer consists of two sheets of sulfur atoms in close-packed ass…
The microstructure of diamonds formed from the graphite in cast iron by an explosive shock process was investigated by means of transmission electron microscopy electron, diffraction, and selected beam microscopy. Morphologically, the material consists of a mixture of two different forms: compact aggregates of of usua…
The temperature coefficient of capacitance (TCC) of most insulators is dominated by five components. The theoretical analysis of these components is outlined and it is shown that, for given ranges of permittivity, the analysis can be greatly simplified. This simplified treatment is shown to apply to widely different t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of crystal radii and electronegativities on the crystallization of AB2X4 stoichiometriesK. Kugimiya and H. SteinfinkCite this: Inorg. Chem. 1968, 7, 9, 1762–1770Publication Date (Print):September 1, 1968Publication History Published online1 May 2002Published inissu…
Shock wave velocity and pressure in high speed liquid-solid impact based on particle velocity
Growth of the posterior silk gland and biosynthesis of fibroin during the fifth larval instar of the silkworm, Bombyx mori, have been studied. In accordance with the exponential increase in the wet weight of the gland, the amounts of DNA, RNA, protein, and lipids per animal increased rapidly in the early stage of the…