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。
Spin-dependent (SD) phonon Raman scattering of Cd${\mathrm{Cr}}_{2}$${\mathrm{S}}_{4}$ is studied using a circularly polarized beam of a He-Ne (632.8-nm) laser in the Faraday configuration. It is found that magnetic-circular-polarization effects on the SD scattering are due to resonance with the "red-shifting" transit…
About 20% of xiphophorin fish (Xiphophorus maculatus) dermal melanophores which were cultured in monolayer for 5 to 10 days responded to light directly, exhibiting reversible melanosome aggregation within a few minutes. In order to determine the spectral sensitivity for the light-response, absorbance changes due to th…
Abstract Although the preparation of polycarbonates based on bisphenol A and 2,2‐bis(4‐hydroxyphenyl)‐1,1‐dichloroethylene was disclosed in 1964 by Porejko et al., little has been reported on their physical and flammability properties. To define the properties of this system these materials were prepared and evaluated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBoron halide clusters and radicals: synthesis and interconversions of the three oxidation states of a nine-boron polyhedronEdward H. Wong and Raifah M. KabbaniCite this: Inorg. Chem. 1980, 19, 2, 451–455Publication Date (Print):February 1, 1980Publication History Published o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic properties of the cluster complex CuI8CuII6[SC(CH3)2CH2NH2]12Cl.3.5SO4.~20H2O, a mixed-valence copper-mercaptide speciesHarvey J. Schugar, Chia-Chih Ou, John A. Thich, Joseph A. Potenza, Timothy R. Felthouse, Muin S. Haddad, David N. Hendrickso…
Proton spin–lattice relaxation times T1 at 15 and 30 MHz, and relaxation times in the rotating frame T1ρ, have been measured over the temperature range 20–230 K for cyclohexane, cyclohexene, 1,3-cyclohexadiene, benzene, and substituted benzenes in glasses made of simple organic molecules. Results for different glass-f…
Abstract A procedure based on loss of weight after selective dissolution analysis (SDA) and washing with (NH 4 ) 2 CO 3 was developed for estimating the noncrystalline material content of soils derived from widely different parent materials. After extracting with 0.2 N ammonium-oxalate or boiling 0.5 N NaOH solutions,…
Abstract Polymorphism in nylon‐12 film, which appears on casting from a phenol‐ethanol solution, has been investigated by x‐ray diffraction and infrared absorption. The casting temperature was varied from 30 to 130°C and the ambient atmospheric pressure from 50 to 760 Torr. Casting at 30°C gives only the α form, while…
Anodic oxides on have been examined using x‐ray photoelectron spectroscopy (ESCA) combined with Ar‐ion etching. The ESCA spectra were analyzed using both analog, and in some cases digital techniques. Results showed the films to be composed of and . The composition at the surface of the films was found to be electrolyt…
1. The periostracum of Mytilus edulis is a highly sclerotized protein structure as demonstrated by its low solubility in 13 M formic acid. 2. The concentration of DOPA in periostracal hydrolysates is not uniformly distributed, but varies directly with protein solubility and logarithmically with the approximate age of…
The 15 N hydrogen profiling technique is used to measure hydrogen concentration profiles in a variety of films including amorphous anodic barrier films grown in different electrolytes, pseudoboehmite, and composite oxide films grown by reaction with boiling water followed by anodic oxidation. Hydrogen profiles of the…
Crystal structures of six metamorphic low cordierites with Fel(Fe + Mg) ranging from 0.07 to 0.42 (atomic) were refined from X-ray data. No evidence of a superstructure was found, confirming that, in chemically intermediate cordierites, Fe and Mg are located o1 a single site. Although T-O distances remain nearly const…
Samples prepared to obtain u.v.‐emitting YAlO 3 : Ce (YAP:Ce) by solid‐state reactions up to 1600°C are never free of visible‐emitting Y 3 Al 5 O 12 : Ce (YAG: Ce). Furthermore, YAG cannot easily be removed from the products. By adding Ba compounds, the YAG content of the product can be minimized, and BaAl 2 O 4 and o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Experimental Study of Single-Component and Binary Adsorption Equilibria by a Chromatographic MethodDouglas M. Ruthven and Ravi KumarCite this: Ind. Eng. Chem. Fundamen. 1980, 19, 1, 27–32Publication Date (Print):February 1, 1980Publication History Published online1 May 20…
Abstract The static dielectric constant ϵ s in Pb 1− x Sn x Te ( x = 0 to 0.4) single crystals is determined from a magnetoplasma reflection measurement between 4.2 and 100 K. At high temperatures ϵ s increases with increasing temperature obeying a Curie law. The Curie constant is practically unchanged for different a…
ESR and Mössbauer effect measurements in the crystallization process of 5Na2O⋅Fe2O3⋅8SiO2 glass were made to elucidate the state of Fe3+ ions in glass. The ESR spectra in the crystallization process showed the disappearance of the g=4.3 line and the narrowing of linewidth of the absorption line centered at g=2.0. The…
Abstract The morphology of linear polyethylene of M w / M n 1.19 crystallized isothermally from the melt has been investigated. Electron microscopy (EM) of stained thin sections gave exceptionally well‐defined images. There were no qualitative differences between Regime I and Regime II crystallization, but the lamella…
Abstract 13 C‐NMR gives sequence information in copolyesters synthesized from ethylene glycol (EG), 1,4‐butane diol (BD), and methyl terephthalate (TP). The EG‐TP‐EG and BD‐TP‐BD blocks are distinguishable from the unsymmetrical diester sequence EG‐TP‐BD. The carbonyl and aromatic quaternary carbons of terephthalate h…
The study of the electronic properties of organic solids is a major new frontier in solid state physics. On the practical side, organic solids provide electronic and optical materials whose properties can be tailored to suit specific applications. They also pose continuing challenges to fundamental concepts because th…
Abstract The residual stresses in injection molded bars of polypropylene have been examined using a stress relaxation method and by the layer removal technique. A positive value for the internal stress parameter was obtained with newly molded specimens and was found to be retained by specimens stored at liquid nitroge…