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 weak-beam method of electron microscopy has been used to analyse the Shockley partial dislocations in a pure h.c.p. metal. Single crystals of cobalt were grown oriented for basal slip and deformed in compression. The dissociation of the basal glide dislocations into partials is resolved; tho arrangement of the mag…
The temperature dependence from 28 to 290°C of the excited-state absorption cross section\sigma_{2a}(E)in the gain wavelength region of alexandrite has been determined from the temperature dependence of the single pass gain (SPG) and of the fluorescence.\sigma_{2a}(E)and the emission cross section increase with temper…
Abstract A thermal aging study of carboxyl‐terminated polybutadiene (CTB) and poly(butadiene‐acrylonitrile) (CTBN) reactive liquid polymers has been conducted at 50°, 75°, 100°, and 125°C. All CTB and CTBNs are stable at 50°C aging. On aging at higher temperatures prior to use, viscosities of CTB and CTBNs increase, a…
Abstract The physical state of the material obtained during the various stages of preparation of a typical MgCl 2 ‐supported, high‐mileage propylene polymerization catalyst was studied by BET, mercury porosimetry, and x‐ray diffraction techniques. The starting MgCl 2 and the substance after HCl treatment have negligib…
The optical characteristics of Sb2Se3 and Sb2Te3 films are changed due to an amorphous-crystalline phase transition below 200 °C. The respective reflectivity of 400 Å Sb2Se3 and 300 Å Sb2Te3 films, each on a Te reflective layer, is increased from 10% to 30% and from 45% to 65% by laser radiation. Using these new mater…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixing of states and the determination of ligand field parameters for high-spin octahedral complexes of nickel(II). Electronic spectrum and structure of bis(1,7-diaza-4-thiaheptane)nickel(II) perchlorateSusan M. Hart, Jan C. A. Boeyens, and Robert D. HancockCite this: Inorg.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEmission spectroscopic properties of dioxorhenium(V) complexes in crystals and solutionsJay R. Winkler and Harry B. GrayCite this: J. Am. Chem. Soc. 1983, 105, 5, 1373–1374Publication Date (Print):March 1, 1983Publication History Published online1 May 2002Published inissue 1…
The effect of time and temperature on the properties and structure of a willemite glass‐ceramic were measured. ‐0 polymorphs of willemite were found to exist in most of the glass‐ceramics. Those properties of the glass‐ceramic which depend primarily on the composition of the glassy phase (helium permeation and diffusi…
The stepwise protonation of three polymeric amines, containing a different shielding group between the amine moieties of the repeating units, has been studied from a thermodynamic standpoint. This was done for comparison purposes with structurally related poly(amido amines) whose monomeric units had been previously fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticlePhase-transition studies in polymesomorphic compounds. 1. Density studies in N-(p-n-hexyloxybenzylidene)-p-n-butylanilineN. V. S. Rao and V. G. K. M. PisipatiCite this: J. Phys. Chem. 1983, 87, 5, 899–902Publication Date (Print):March 1, 1983Publication History Published online1…
Ferrous/ferric equilibria were determined in alkali‐alkaline‐earth borosilicate glass as a function of temperature, oxygen partial pressure, and glass composition. Expected linear relations are found between log(Fe 2+ /Fe 3+ ) and log( p O 2 ) or 1/ T . The slopes of the correlation with 10g( p O 2 ) are near the expe…
We present results of calculations of the reflectivity of diffraction gratings of sawtooth profile, and of electric fields near such gratings. We employ a method based on the use of the extinction theorem, and the grating amplitude is not assumed small. This approach also allows one to calculate the electric fields wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEpoxidation of alkenes with trichloroacetonitrile/hydrogen peroxide in a neutral biphasic solvent systemLuis A. Arias, Stevie Adkins, Christopher J. Nagel, and Robert D. BachCite this: J. Org. Chem. 1983, 48, 6, 888–890Publication Date (Print):March 1, 1983Publication Histor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal complexes with tetrapyrrole ligands. 30. The manganese-nitrogen triple bond. Synthesis and molecular stereochemistry of (5,15-dimethyl-2,3,7,8,12,13,17,18-octaethyl-5H,15H-porphinato)nitridomanganese(V)Johann W. Buchler, Christine Dreher, Kiong Lam Lay, Young J. Lee, a…
The low-temperature heat capacity of superconducting ternary iron silicides ${\mathrm{Lu}}_{2}$${\mathrm{Fe}}_{3}$${\mathrm{Si}}_{5}$, ${\mathrm{Sc}}_{2}$${\mathrm{Fe}}_{3}$${\mathrm{Si}}_{5}$, and ${\mathrm{Y}}_{2}$${\mathrm{Fe}}_{3}$${\mathrm{Si}}_{5}$ has been measured, revealing several anomalous properties of the…
The hydride Mg2NiH4 exhibits a phase transition from a low temperature to a high temperature phase at about 508 K. The dynamics of the hydrogen in the high temperature phase have been studied by cold neutron scattering experiments. According to these, the hydrogen atoms showed a high mobility, but the motion was mainl…
This work concerns three questions: How can one decide whether a particular liquid metal will wet a given oxide substrate? What does analysis of experimental data tell one about the nature of the metal-substrate interactions? Is there correlation with strong metal-support intereactions in catalysis? Comparison of the…
Adenylate cyclase of Escherichia coli K12 has been purified 17,000-fold to near homogeneity from a 5-fold overproducing strain. One major band of Mr = 92,000 and several minor bands are seen on sodium dodecyl sulfate-polyacrylamide electrophoresis of the purest fractions. Identification of the enzyme with the 92,000-D…
Abstract Fibers of poly( L ‐lactide) (PLLA) with a tensile strength up to 1.2 GPa and Young's modulus in the range of 12–15 GPA were obtained by a hot drawing of fibers spun from solution of PLLA in good solvents such as dichloromethane and trichloromethane. The tensile strength of fibers was strongly dependent on the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of annealing and prior history on enthalpy relaxation in glassy polymers. 3. Experimental and modeling studies of polystyreneIan M. Hodge and G. S. HuvardCite this: Macromolecules 1983, 16, 3, 371–375Publication Date (Print):March 1, 1983Publication History Published…