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。
Fornacite, Pb 2 (Cu,Fe)[CrO 4 (As,P)O 4 OH], is monoclinic, with a = 8.101 Å, b = 5.893 Å, c = 17.547 Å, β = 110°00′, space group P 2 1 / C . After making spherical absorption and Lorentz-polarization corrections, a three-dimensional Patterson synthesis was computed and the heaviest atoms located. The oxygen positions…
A definition of “free” or maximum unoccupied volume, f = 1 — da/dc, is presented where da and da are the densities of the amorphous and ideally crystalline phases of a glassy amorphous polymer. This definition was combined with the well-known hypothesis that drawing a glassy polymer introduces free volume. With the fu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibrium pressures of hydrogen dissolved in .alpha.-zirconiumFranco Ricca and Tiziano A. GiorgiCite this: J. Phys. Chem. 1967, 71, 11, 3627–3631Publication Date (Print):October 1, 1967Publication History Published online1 May 2002Published inissue 1 October 1967https://pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared and nuclear magnetic resonance studies of some tin phthalocyanines and hemiporphyrazinesLaurel E. Sutton and Malcolm E. KenneyCite this: Inorg. Chem. 1967, 6, 10, 1869–1872Publication Date (Print):October 1, 1967Publication History Published online1 May 2002Publishe…
The effect of heat treatment of trans-1,4-polybutadiene single crystals prepared from dilute benzene solution was studied by dilatometry, X-ray diffraction, and dynamic viscoelastic measurement. The crystal transformation temperature of the single crystal is 55.5[ddot]C, 20[ddot]C lower than that of the bulk crystalli…
Abstract The factors contributing to the selective permeation of water and sodium chloride through cellulose acetate membranes have been examined by the use of radioactive tracers. With decreasing acetyl content both the partition coefficient (solubility) and diffusion coefficient of water increased, the latter the mo…
A striking change in coherence is obtained when single-crystal platelets of linear polyethylene are recrystallized by annealing at temperatures between 120°C and the melting point, 137°C. Instead of showing micaceous cleavage, the sintered crystal mat is ductile and malleable in shear, yet still will not flow under co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures of bismuth halide complex salts. I. 2-Picolinium tetrabromobismuthate(III) and tetraiodobismuthate(III)Bobby Ken Robertson, W. Gant McPherson, and Edward A. MeyersCite this: J. Phys. Chem. 1967, 71, 11, 3531–3535Publication Date (Print):October 1, 1967Publ…
1. N-Acetylglucosamine 6-phosphate deacetylase and 2-amino-2-deoxy-d-glucose 6-phosphate ketol-isomerase (deaminating) (EC 5.3.1.10, glucosamine 6-phosphate deaminase) of Escherichia coliK(12) have been separated by chromatography on DEAE-cellulose. 2. N-Acetylglucosamine 6-phosphate deacetylase has optimum pH8.5 and…
Photoluminescence emanating from ``pure'' high resistivity SrTiO3 has been examined between 4000 and 13 000 Å as a function of temperature and 3650 Å irradiation. One strong narrow peak (7929 Å at 95°K; half-width ≤1 Å) and 9 associated peaks (7852, 8005, 8051, 8098, 8280, 8304, 8469, 8574, 8726 Å), each of which exhi…
A model is presented to explain premature fracture of titanium- boron composites as a result of interaction to form titanium boride. Three failure modes are identified. The titanium boride cracks at a strain of 2500 x 10 -6 but the cracks result in a smaller stress concen tration than the preexisting flaws in the boro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry and synthesis of .alpha.-agarofuranH. C. Barrett and George. BuechiCite this: J. Am. Chem. Soc. 1967, 89, 22, 5665–5667Publication Date (Print):October 1, 1967Publication History Published online1 May 2002Published inissue 1 October 1967https://doi.org/10.102…
Absorption spectrum of RbMnF3 crystal has been studied at room temperature and at 77°K. The observed band positions are fitted with four parameters, B, C, Dq, and α, and the values of the parameters for the 77°K spectrum are 840, 3080, 780, and 76 cm−1, respectively. The shift in band positions on reducing the tempera…
Interstitial solutes in a Zr, Ti and Hf are very effective in raising the tensile flow stress, especially at temperatures up to about one half of the transformation temperature, with one at. % of solute increasing the room temperature yield strength by up to 50 kg/mm2 Low-temperature deformation is controlled by a the…
Recent considerations by Wada make it appropriate to extend a previous discussion of Grüneisen ``numbers'' for polymers and other molecular solids. Wada hypothesized that the proper Grüneisen constant for polymers is γG=αV/βCvb, where Cvb is the interchain contribution to the heat capacity at constant volume; α, β, an…
This paper calculates the energy of formation Ws of Schottky defects in ionic crystals by methods derived from the original method of Mott and Littleton. The main aim of these calculations is to examine the variations in the predicted energies resulting from reasonable variations in the assumed models. The types of va…
A study has been made of the mechanical-relaxation behavior of an ethylene-methacrylic acid copolymer containing 4.1 mole % acid units and its partially ionized sodium salts. Degrees of ionization, estimated from infrared analysis, ranged from 0% to 78%. The weight-percent crystallinity of the samples, determined by d…
The lack of myostatin promotes growth of skeletal muscle, and blockade of its activity has been proposed as a treatment for various muscle-wasting disorders. Here, we have examined two independent mouse lines that harbor mutations in the myostatin gene, ...
Velocity measurements on cracks in sapphire and glass have been made using Wallner lines. Contrary to the view that crack-branching in a given material occurs at a constant critical velocity, it is found that the branching velocity can vary with the stress on the crack. On the other hand, [sgrave]cb1/2- is constant. H…
A study has been made of the electrical conductivity and thermoelectric power of liquid alloys Te1-x Se x with 0≤-x≤-0.5. The temperature range extends from undercooling to about 900°C for electrical conductivity and 750°C for thermoelectric power. A partial conservation after melting of covalent bonds between the ato…