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。
Porous carbon–carbon preforms, 10.8 cm o.d.×4.4 cm i.d.×3.0 cm thick have been densified in a one-cycle, 26 h process. The disks are heated by induction, creating an inside-out thermal gradient, and are exposed to cyclopentane vapor in a water-cooled vacuum chamber. Rough-laminar carbon microstructure is obtained; a c…
This paper presents a new method for determination of instantaneous magnetization characteristics of transformers (saturation and hysteresis loop) by taking into account only the RMS values and no-load losses. This model is used to accurately study ferroresonance phenomena in a system of a cable-connected transformer.…
Modifications of the phase-separated surface of polystyrene–polyethyleneoxide (PS-PEO) blend films were carried out by using an atomic force microscope. On PEO, contrary to PS, a scanning of a tip with large forces of 50 nN resulted in a modification of surface and increased the elastic stiffness. The modification was…
An analytical treatment for the sedimentation rate of disordered suspensions is presented in the context of a resistance problem. From the calculation it is confirmed that the lubrication effect is important in contrast to the suggestion by Brady and Durlofsky [J. F. Brady and L. J. Durlofsky, Phys. Fluids 31, 717 (19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentacoordinated Aluminum in Noncalcined Amorphous Aluminosilicates, Prepared in Alkaline and Acid MediumsB. M. De Witte, P. J. Grobet, and J. B. UytterhoevenCite this: J. Phys. Chem. 1995, 99, 18, 6961–6965Publication Date (Print):May 1, 1995Publication History Published on…
In order to describe the evolution of rolling textures in bcc metals, and particularly to assess the contribution of dislocation slip on {123} glide planes, a Taylor model, which makes use of increasing strain relaxation and considers various types of bcc glide system, is applied. The deformation is simulated in the r…
Two new ferroelectric oligosiloxanes, a cyclic tetramer and a twin, have been synthesized. By a comparative study with their corresponding monomer and side chain polysiloxanes, the influence of oligo- and polymerization on the liquid crystalline and ferroelectric properties have been investigated. Polymerization leads…
Crystal structures of mitochondrial aconitase with alpha-methylisocitrate and with sulfate bound have been solved and refined at 2.0 A resolution with R factors of 18.2 and 16.8%, respectively. The steric factors and conformational effects observed in both new structures support the proposed mechanism for the overall…
Abstract Recently, a model was developed for the nonisothermal crystallization of normal alkanes with chain lengths between 30 and 50. The model was derived based on the fundamental equation of Ozawa for nonisothermal crystallization, the surface nucleation theory, and the growth rate theory for extended chain crystal…
Lanthanide chelate labels containing substituted 4-(arylethynyl)pyridine as the chromogenic moiety and iminobis(acetic acid) groups as the chelating part were synthesized. N-Succinimidyl esters of the carboxy derivatives of thyroxine and progesterone were prepared and coupled to the aliphatic amino groups of the synth…
Abstract A novel manganese(III) complex having an optically active N,N′-bis(3-oxobutylidene)diamine ligand with bulky substituents was prepared and characterized crystallographically. In the presence of a catalytic amount of the manganese(III) complex, unfunctionalized olefins were oxygenated to give optically active…
Optical properties of Er3+ -doped fluoride glasses in the pseudoternary systems MFn–BaF2–YF3, where M is Zr, Hf, Al, Sc, Ga, In, or Zn, were investigated, and the variation of the local structure was discussed. Of the three Judd–Ofelt Ωt parameters (t = 2, 4, 6) that dominate the f–f transition probabilities of Er3+ i…
A variety of nonplanar σ-bonded phenyl- and (fluorophenyl)iron(III) porphyrins are characterized as to their electrochemical and spectroscopic properties in nonaqueous media. The investigated compounds are represented as (OETPP)Fe(R), where R = C6H5, C6F4H, or C6F5 and OETPP is the dianion of 2,3,7,8,12,13,17,18-octae…
Abstract A method is presented which allows the calculation of phase diagrams (spinodal, binodal and tie lines) on the basis of the Gibbs energy of mixing Δ G . No derivatives of Δ G with respect to the composition variables are required. This method is particularly useful in cases where the composition dependence of…
Accurate refractive indexes of oxide glasses—silica, silicate, borate, aluminate, tellurite, antimonate, and heavy metal gallate glasses—are presented in the wavelength range 0.265 to 1.710 μm. Factors affecting the refractive index dispersion are discussed by using the single‐oscillator Drude‐Voigt equation. The valu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUpconversion Luminescence in Er3+-Doped RbGd2Cl7 and RbGd2Br7Toni Riedener, Karl Kraemer, and Hans U. GuedelCite this: Inorg. Chem. 1995, 34, 10, 2745–2752Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 May 1995https://pu…
Following the characterization of polyoxypregnane esters and esterified glycosides from the less polar extracts of Leptadenia hastata, 34 new congeners have been isolated from the more polar extracts. They possess sarcostin or deacetylmetaplexigenin as the aglycons and acetyl, benzoyl, cinnamoyl, nicotinoyl, and m-hyd…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange Alternation and Single-ion Anisotropy in The Antiferromagnetic Heisenberg Chain S = 1. Magnetic and Thermal Properties of the Compound Ni2(EDTA).cntdot.6H2OJ. J. Borras-Almenar, E. Coronado, J. Curely, and R. GeorgesCite this: Inorg. Chem. 1995, 34, 10, 2699–2704Pub…
KTA is a crystallographic isomorph of KTP that shows promise for nonlinear frequency generation throughout the 1–5-μm region. We present updated Sellmeier coefficients for KTA based on measurements of the refractive index in the 0.4–3.6-μm region. Predictions of phase-matching behavior by means of these coefficients a…
Diatoms were extracted from subsampled sections of four dated sediment cores collected in the mesohaline Chesapeake Bay, U.S.A. Over 400 species in 76 genera were identified. A complete list of the species identified from the cores is given, together with information on their relative abundance. Forty-six of the more…