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。
Transmission electron microscopy on Mg-end member majorite crystals synthesized at 22 GPa and above 2350°C reveals a modulated microstructure, characterized by mutually intersecting linear contrasts parallel to the tetragonal {101} planes, with a typical wavelength of the modulation between 150 and 300 A. Streaking pe…
Summary A non‐isothermal method for determination of diffusional parameters was developed. the dependence of diffusivity on temperature was described by an Arrhenius type equation, with the pre‐exponential factor and the activation energy as parameters. These parameters were obtained by optimization of the fit between…
Abstract The solubility behaviour of β‐cyclodextrin in aqueous mixtures was studied by determining the interactions between the co‐solvent and water. Three clear classes of co‐solvent are evident. In the first, including ethanol, tetrahydrofuran and acetone, there is formation of clathrate hydrates by the co‐solvent.…
A factor which determines the network structure of diborate glasses containing divalent cations was proposed on the basis of structural studies by a combination of diffraction methods (x-ray and neutron), computer simulation and Raman spectroscopy. Structural analysis revealed that the network of Ba0.2B 2 O 3 and Pb0.…
Factors contributing to the variations in the Cu(I)-Cu(I) distances in two clusters with identical ligand and coordination geometries have been analyzed. While the hexamer, 4, exhibits metal-metal distances in the range 2.81-3.25 Angstrom, shorter contacts are found in the corresponding tetramer, 3 (2.60-2.77 Angstrom…
SUMMARY The micromorphology of eluvial and glossic areas with weak soi1, strength from the upper fragipan, and the upper parts of grey polygonal zones, in some argillic brown earths (Glossic Fragiudalfs) from north‐east England shows unstable void walls stripped of clay with remnants of ferri‐argillans, pale grey grai…
We used consolidation (hot pressing) and deformation (die upsetting) techniques to produce magnetically anisotropic permanent magnets from melt-spun PryCo100−y−xCx alloys. The primary phase in these magnets (16≤y≤24 at. %) was the hexagonal PrCo5 phase. The greatest alignment was obtained for low-carbon compositions (…
The effects of anodization temperature on the photoluminescence (PL) spectrum of porous silicon (Si) have been studied. The luminescence intensity increases exponentially and the peak wavelength decreases monotonically with increasing anodization temperature during formation of pores on Si. The PL intensity increases…
Leach characteristics of some typical nuclides such as cesium, strontium, cobalt, I−, and CO3−2 from ordinary portland cement waste forms have been studied using the ISO test method and radiotracers of the respective nuclides, i.e., 134Cs, 85Sr, 60Co, 131I, and 14C. The leach studies suggest a rapid release of radioac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLinear viscoelastic diffusion in the polystyrene/ethylbenzene system: differential sorption experimentsG. F. Billovits and C. J. DurningCite this: Macromolecules 1993, 26, 25, 6927–6936Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProbing the influence of local coordination environment on ligand binding in nickel hydrogenase model complexesMikyung Cha, Christine L. Gatlin, Susan C. Critchlow, and Julie A. KovacsCite this: Inorg. Chem. 1993, 32, 25, 5868–5877Publication Date (Print):December 1, 1993Pub…
Abstract Changes in properties of PVC compounds upon weathering are categorized as due to physical aging or due to chemical change. PVC's tensile strength, flexural strength, tensile modulus, and flexural modulus generally rise slightly with weathering. DSC data on weathered samples show an annealing effect identical…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSupramolecular photochemistry of crystalline host-guest assemblies: absolute asymmetric photorearrangement of the host componentTai Y. Fu, Zhaoqing Liu, John R. Scheffer, and James TrotterCite this: J. Am. Chem. Soc. 1993, 115, 25, 12202–12203Publication Date (Print):Decembe…
Neutron-scattering techniques have been used to study the premartensitic state of a family of Cu-Al-Be alloys, which transform from the bcc phase to an 18R martensitic structure. We find that the phonon modes of the ${\mathrm{TA}}_{2}$[110] branch have very low energies with anomalous temperature dependence. A slight…
An extension of the modified weighted-density approximation (MWDA) is presented which retains the key features of the original MWDA in that it continues to describe the nonuniform system through the use of low-order correlation functions of the uniform counterpart. However, the approximate free energy functional is no…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text J. Larry Pezzaniti, Stephen C. McClain, Russell A. Chipman, and Shih-Yau Lu, "Depolarization in liquid-crystal televisions," Opt. Lett. 18, 2071-2073 (…
Abstract Reversed brackets on As and Sb partitioning between tetrahedrite-tennantite fahlores {∼CU 10 (Fe,Zn) 2 (Sb,As) 4 S 13 } and bournonite-seligmannite solid solutions {CuPb(Sb,As)S 3 } (400°C evacuated silica tubes, NH 4 Cl flux) indicate that the maximum nonidealities associated with the As-Sb substitution are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, characterization, and reactions of novel iron(III) porphyrin dication complexesHiroshi Tsurumaki, Yoshihito Watanabe, and Isao MorishimaCite this: J. Am. Chem. Soc. 1993, 115, 25, 11784–11788Publication Date (Print):December 1, 1993Publication History Published…
Fmoc-Argw, w′(Boc)2-OH and Boc-Argw, w′(Cbz)2-OH were prepared in two steps: Guanylation of Cu(II)-ornithine complex at Nδ with N, N′bis-urethane protected derivatives of 1-guanylpyrazole, followed by Nα-protection using either 9-fluorenylmethyl succinimidylcarbonate or di-t-butyl-dicarbonate in the presence of EDTA.…
Polypropylene fabrics were extracted with carbontetrachloride and acetone by Soxhlet extraction, and then PPAN ( plasma polymerized acrylonitrile ) was grafted to the surface of the extracted fabrics using a ground pressure of 0.05 mm Hg, 0.3 mm Hg pressure in the reactor, 60 W and 100 W RF power, and reaction times o…