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。
Preferential anodic dissolution of Zn from brass is examined from the point of view of the volume diffusion mechanism. Results from x‐ray investigations of partially dissolved γ‐brass (Cu 65 a/o (atomic per cent) Zn) and η‐brass [Cu 86 a/o Zn] specimens show the appearance of new, more Cu‐rich, intermediate and termin…
Chitin was prepared from prawn shell waste by a chemical process involving demineralization, deproteinization and decolorization. Chitosan was prepared from chitin by deacetylation. The present study was undertaken to evaluate the influence of deacetylation process during chitosan production on the physiochemical and…
The kinetics of the hydrogen evolution reaction on titanium in sulfuric acid solutions between pH 0.25 to 2.25 have been investigated. The Tafel slope of the HER was 150 mV at all pH values, and the electrochemical reaction order was 0.6 with respect to the hydrogen ions. The corrosion potential varied negligibly with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1:13 Heteropolyvanadates of manganese(IV) and nickel(IV)Charles M. Flynn Jr. and Michael T. PopeCite this: J. Am. Chem. Soc. 1970, 92, 1, 85–90Publication Date (Print):January 1, 1970Publication History Published online1 May 2002Published inissue 1 January 1970https://pubs.a…
The adsorption of carbon dioxide on magnesia (prepared by hydrolysis of magnesium methoxide) has been studied by measurements of the i.r. spectra of carbon dioxide which had been adsorbed at various temperatures, supplemented by gravimetric measurements of adsorption isotherms at temperatures ranging from –97·9 to 500…
This review is divided into seven sections entitled "Introduction", "Basic theoretical framework", "Readily available materials", "Applications", "Performance and limitations of narrow band interference filters", "Problems in the preparation of optical coatings" and "Probable future developments". In the introductory…
Abstract A study of the ratio of the glass temperature to the melting point of 132 polymers is described. Contrary to some other workers' observations on smaller numbers of polymers there is no sharp division between the ratios observed for symmetrical and unsymmetrical polymers. The arithmetic mean of the ratio is 0·…
The microstructural defects produced in molybdenum by neutron irradiation in the temperature range 50 °C to 800 °C have been characterized by transmission electron microscopy. At a low irradiation temperature, 50 °C, a large number of small dislocation loops, presumably interstitial, form within a complex dislocation…
Abstract The production of dry matter and the uptake and concentration of nutrients by barley ( Hordeum vulgare L.) from soil adjusted to different levels of salinity with a mixture of salts were evaluated in a greenhouse study. Following germination of the plants, soil salinity levels ranging from EC values of 0 to 3…
Abstract not Available.
General expressions are derived for the magnitude and dispersion of elasto-optic coefficients in terms of strain-induced modifications of both the electronic energy-band structure, and, if present, the excitonic structure. This analysis uses the deformation potential concept in conjunction with oscillator models for t…
An inelastic neutron scattering investigation of high-temperature $\ensuremath{\beta}$ quartz by triple-axis spectrometry reveals the existence of a phonon branch with anomalously low and temperature-dependent frequencies. Near the Brillouin zone center, the mode is overdamped and unstable, and gives rise to a critica…
The mechanism of the hydrated nickel hydroxide electrode, used in the nickel cadmium battery, is a matter of considerable controversy. Potential sweep experiments were performed on film nickel hydroxide electrodes in an effort to determine the oxidation‐reduction mechanism. The existence of more than one reduced struc…
The diffusion coefficient for protons moving in the hydrated nickel hydroxide lattice has been determined using a potential step technique. It was found to have the value about during charging and during discharging for the nickel hydroxide structure usually found in the nickel electrode of the nickel‐cadmium battery.…
As far as the electrical conductivity is concerned, solids are usually classified as metals, semiconductors, or insulators. In metals the concentration of the charge carriers responsible for the electrical conductivity is large, whereas in semiconductors and insulators the carrier concentration is much smaller. The di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDipole polarizabilities of ions in alkali halide crystalsJohn Norton Wilson and Richard M. CurtisCite this: J. Phys. Chem. 1970, 74, 1, 187–196Publication Date (Print):January 1, 1970Publication History Published online1 May 2002Published inissue 1 January 1970https://pubs.a…
The temperature rise in thin metallic foils under intense electron irradiation has been computed as a function of beam conditions, electron energy, and the physical properties of the foil. The model due to Gale and Hale was used in conjunction with the corrected Bethe electron energy loss formula for relativistic elec…
A new mathematical model of dynamic hysteresis loops is presented. The model is completely specified by two strictly monotonically increasing functions: a restoring function f(.) and a dissipation function g(.). Simple procedures are given for constructing these two functions so that the resulting model will simulate…
The present paper discusses pure liquid phases of long chain molecules each of them carrying heavy atoms « I » either at one end (case A) or at both ends (case B). For case A we find a non trivial I I correlation, due to the repulsion between carrier chains. For caxe B, the above effect competes against the direct cor…
Abstract The force required to stretch a polymer chain by 1% ( f value) was calculated from experimental values of elastic moduli E 1 in the direction of molecular axis and the cross‐sectional area of the molecule of 25 well known polymers. The f value is mainly dependent on the conformation of a molecule and almost i…