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 melting of nascent superhigh-molecular-weight poly(ethylene oxide) (PEO) has been studied by means of differential scanning calorimetry (DSC). High values of the melting temperatures and enthalpies were established. The higher temperatures are explained by the presence of tie molecules in high concentration. The p…
The myelographic contrast agent, metrizamide, causes a temporary confusional state in many patients. Since metrizamide is a 2-deoxyglucose analogue, it was tested for inhibitory effects on glucose metabolism. The Michaelis constant (Km) of human brain hexokinase for glucose rose from 0.039 to 0.24 and 0.47 mM with fin…
Nuclear spin relaxation times are calculated for quadrupolar nuclei situated at the center of octahedral and tetrahedral molecules. Vibrational distortion of such a molecule generates an electric field gradient at the center, which does not average to zero when the molecule is in an excited state of a degenerate vibra…
The thermal decomposition and the glass transition temperature (T) of polyisobutylene (PIB) were studied with a differential scanning calorimeter (DSC). The undecomposed and the decomposed polymers were analyzed by gel permeation chromatography for molecular weight distributions and by DSC for changes in the thermal p…
The standard method for the calculation of nuclear weapon fallout radiation doses and dose rates in operational type studies for the last 20 yr has been the computer algorithm known as WSEG-10. WSEG-10 uses empirical functions rather than numerical analyses and computes fallout dose (rates) in seconds or less on moder…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrido(triphenylsilyl)tetracarbonyliron derivatives with phosphine ligandsG. Bellachioma and G. CardaciCite this: Inorg. Chem. 1982, 21, 8, 3232–3234Publication Date (Print):August 1, 1982Publication History Published online1 May 2002Published inissue 1 August 1982https://d…
Faujasite occurs with phillipsite in a palagonitized cinder cone in the southern half of section 16, R. ll E., T. 16 N., Halloran Spring Quadrangle, San Bernardino County, California. Faujasite forms water-clear, millimeter-sized octahedra, commonly twinned on the spinel law. Averaged electron microprobe analyses yiel…
Densitometric scans of electron micrographs of type I collagen segment long spacing crystallites stained with uranyl acetate or phosphotungstic acid and uranyl acetate have been correlated with computer-synthesized scans derived from the sequence of the alpha 1(I) and alpha 2 chains. Three models that differ in the lo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry and reactivity of sulfur-bonded sulfenato-cobalt(III) complexesJ. D. Lydon and Edward DeutschCite this: Inorg. Chem. 1982, 21, 8, 3180–3185Publication Date (Print):August 1, 1982Publication History Published online1 May 2002Published inissue 1 August 1982https://pu…
The permeability of intact gas vesicles, isolated from the cyanobacterium Anabaena flos-aquae, to percyclofluorobutane (C4F8), has been investigated by two methods. Warburg manometry showed that a suspension of intact gas vesicles exchanges more C4F8 than an equivalent suspension of collapsed ones. Pressure nephelomet…
Abstract Previous investigators have indicated that stabilizers will block the transesterification catalyst in the preparation of PET by the DMT process. This was not the case when triphenyl phosphate (TPP) or Irganox 1010 was used as the stabilizer and manganous acetate as the catalyst. Stabilizers in this study incl…
The dynamics of a high-angle tilt boundary in a triangular lattice with a truncated Lennard-Jones potential has been simulated by the method of computer molecular dynamics. Boundary migration was observed at various temperatures above a threshold, and was interpreted in terms of small steps involving coupled sliding a…
The temperature variation of the refractive indices ( n o, n e) and density are reported for two liquid crystals. The order parameter is evaluated by both Vuks’ and Neugebauer's approaches. The possible sources of error in evaluating the order parameter from refractive indices measurements have been discussed. The con…
Ivory can undergo severe cracking and splitting when exposed to adverse environmental conditions. The anisotropic dimensional properties of ivory have been investigated under varied temperature and relative humidity conditions. Migration of moisture into and out of ivory was found to play the principal role in its exp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEpoxidation of olefins by a polymeric reagent electrochemically generated and recycled in situJunichi Yoshida, Jiro Hashimoto, and Nariyoshi KawabataCite this: J. Org. Chem. 1982, 47, 18, 3575–3577Publication Date (Print):August 1, 1982Publication History Published online1 M…
Abstract Die neue Verbindung K 4 Si 4 Te 10 kristallisiert orthorhombisch (Raumgruppe Pnma) mit den Gitterkonstanten: a 2125,8(8) pm, b 1 200,5(7) pm, c 1 060,8(7) pm. In der Struktur sind SiTe 4 ‐Tetraeder ausgebildet, die über gemeinsame Ecken zu Adamantan‐analogen Si 4 Te 10 4− ‐Einheiten verknüpft sind.
Corrosion fatigue experiments have been carried out in a 0.5N and 4N sodium chloride solution with pH of 6.5 at 80 C. The solution has been air saturated. Two different chromium steels were examined, a tempered martensitic steel with 12% chromium and a pure ferritic steel with 18% chromium and 2% molybdenum. The resul…
Abstract Measurements were made of linear viscoelastic properties and nonlinear stress‐strain properties of phase‐separated styrene‐butadiene‐styrene (SBS) copolymers and their blends with several homopolymer polystyrenes (PS) and one random copolymer (SBR). Torsion pendulum testing yielded shear moduli G ′, G ″, and…
Abstract The technique of heat flow calorimetry was used to determine the specific heat of coffee and chicory products and to study their thermal behaviour above 20°C. Intensive exothermic reactions were particularly evident when measurements were made with sealed cells. The data obtained help in the understanding of…
A method has been developed to characterize the resistance of polymers to erosion by surface discharges. It was found possible to produce surface discharges on wet, contaminated surfaces without the usual disturbing influences of metal electrodes and wetting agents. Instrumentation was devised to monitor continuously…