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 paper presents an analysis of WAXS (wide-angle X-ray scattering) data which aids an understanding of the structure of non-crystalline polymers. Experimental results are compared with calculations of scattering from possible models. Evidence is presented which supports the view that the chains in molten PE do not l…
Pressure–composition–temperature relationships are presented for the titanium–cobalt + hydrogen and the titanium–nickel + hydrogen systems for the ranges 10 kPa to 2 MPa and 325 to 600 K. The TiCo + H system exhibits three distinct two-phase regions, whereas the TiNi + H system contains no two-phase regions in this ra…
In this review the authors cover both the scientific and practical aspects of the metallurgy of galvanized coatings. They begin the review by considering the current iron—zinc equilibrium phase diagram; special emphasis is placed on the correlation between the actual phases found in galvanized coatings and those which…
Specimens of 99·9 %purity copper were deformed initially by torsion up to €=200. Their mechanical properties were determined from tensile tests. The extreme values of mechanical properties were observed in a range of strain €=3−200. Changes in microstructure reflecting the mechanicalproperties of the specimens were in…
The occurrence and stereochemistry of a rapid reversible C–H fission in [[graphic omitted]But2)] is established by n.m.r. spectroscopy, including triple resonance INDOR, and by X-ray crystallography.
It has been demonstrated that self‐concentration quenching mechanisms can be determined from luminescence intensity measurements as a function of activator concentration if the excitation of a powdered phosphor screen is made with the directly and weakly absorbed radiation.
Casting alloys of eutectic composition are of great practical importance. Good microstructural control of these alloys is essential in obtaining the required properties in the cast state. Primary phases present in a eutectic matrix may have either a beneficial or a detrimental effect on these properties. Therefore, th…
Characteristic features of isothermal growth, thickening and melting behaviour of melt grown single crystals of low molecular weight poly(ethylene oxide) fractions are described and discussed in terms of their relevance to basic concepts of polymer crystal growth. In the narrow temperature interval where transition fr…
УСПЕХИ ФИЗИЧЕСКИХ Η Λ У К 535.44 ОПТИКА ХОЛЕСТЕРИЧЕСКИХ ЖИДКИХ КРИСТАЛЛОВ В. А. Беляков, В, Е. Дмитриеико, В. П. Орлов СОДЕРЖАНИЕ 1. Введение 221 2. Кинематическое рассмотрение 224 а) Сечение рассеяния (225).б) Поляризационные характеристики (226).3. Случай нормального падения 227 а) Собственные волны (227).б) Решение…
A detailed NMR, magnetization, x-ray, and neutron-diffraction study is reported for the ${\mathrm{Fe}}_{3\ensuremath{-}x}{\mathrm{Co}}_{x}\mathrm{Si}$ system over the entire range of Co concentration ($0\ensuremath{\le}x\ensuremath{\le}3.00$). As the Co concentration $x$ is increased, the x-ray measurements indicate t…
Diffusion coefficient of hydrogen in iron has been determined at temperatures between 230 and 300 K. The permeation of hydrogen through the speimen has been measured by an electrochemical method in which alcoholic solutions were used as electrolytes. The experimental permeation curves were analyzed by considering the…
The molecular relaxations in polymeric systems have aroused great interest among polymer scientists during the last decades because these phenomena have profound effects upon many important properties of polymers (e.g., upon mechanical behavior, solid-state reactivity, diffusion, melt rheology, and solution properties…
A field emission electron microscope with highly stabilized gun and illuminating system was developed. Several experiments were made to demonstrate the high performance of the microscope. The brightness of the beam was more than that of the conventional ones, which feature was demonstrated by taking 300 Fresnel fringe…
Abstract An investigation is made of the energy spectra of A and B excitons in CdS by measuring the transmission and reflectivity of very thin highly perfect crystals at 1.8 K. The excited states of both series follow hydrogen‐like series in a good approximation yielding different Rydberg's R = (28 ± 0.4) and R = (31.…
The compositional and structural changes on surfaces that affect the durability of soda-limesilica glasses are discussed. The book begins with a general review of corrosion and weathering phenomena in glass which is followed by a review of the applicable surface analytical techniques (scanning electron microscopy, ene…
Carbon monoxide, oxygen and hydrogen were found to be chemisorbed on dehydrated AgA zeolites. This was investigated in detail using volumetric sorption and temperature programmed desorption techniques. Also i.r. and mass spectrometry were used to characterize the solid and the desorbed molecules.It was found that as a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of electron-withdrawing substituents on the electrochemical oxidation of porphyrinsA. Giraudeau, H. J. Callot, and M. GrossCite this: Inorg. Chem. 1979, 18, 1, 201–206Publication Date (Print):January 1, 1979Publication History Published online1 May 2002Published inis…
Gold has been supported upon SiO2 and γ-Al2O3 using an impregnation technique and HAuCl4 solutions. The severity of the conditions required to effect the reduction/decomposition of the acid to metallic Au upon the support decreased and the activity per unit weight of metal in the hydrogenation of pent-1-ene at 373 K i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDerivatives of heteropolyanions. 1. Organic derivatives of W12SiO404-, W12PO403-, and Mo12SiO404-W. H. KnothCite this: J. Am. Chem. Soc. 1979, 101, 3, 759–760Publication Date (Print):January 1, 1979Publication History Published online1 May 2002Published inissue 1 January 197…
Manganese(III) forms many high spin d4 porphyrins, for which pyridyl, N-methylpyridyl, sulphonic acid and carboxylic acid and carboxylic acid functions act as water solubilising groups. Reduction with dithionite yields the corresponding manganese(II) porphyrin. Both oxidation states have been clearly identified by e.p…