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。
A novel polymer of a binuclear nickel(II) complex of [Ni 2 L(μ-H 2 N-(CH 2 ) 3 -NH 2 ) 2 ·(H 2 O) 2 ] n ·(ClO 4 ) n ·(H 2 O) n (where L = [2 + 2] condensation of 2,6-diformyl-4-methylphenol with 1,3-diaminopropane) has been synthesized and characterized. The crystal structure of the compound has been solved. The compo…
The Pollack Farm Site near Cheswold, Delaware, is named for a borrow pit excavated during highway construction. The excavation exposed a portion of the Cheswold sands of the lower Miocene Calvert Formation. Two sand intervals (Cheswold C-3 and C-4) yielded a diverse assemblage of land and marine vertebrate remains and…
Ikaite (CaCO3·6H2O) transforms to calcite, aragonaite and/or vaterite, which are the polymorphs of calcium carbonate, at normal temperature and pressure. The presence of water promotes the transformation of natural ikaite to calcite in a room but the presence of magnesium ion in a solution reduces the transformation r…
This paper reports an experimental investigation into the effect of the physical and mechanical properties of sewing threads on the seam appearance of lightweight fabrics, which are prone to seam pucker. In this work, a range of forty-two commercial sewing threads of various ticket numbers, yarn structures, and from v…
Article SiO2-P2O5-B2O3 Wood-Inorganic Composites Prepared by Metal Alkoxide Oligomers and their Fire-Resisting Properties was published on January 1, 1998 in the journal Holzforschung (volume 52, issue 4).
Article Species of the Diatom Genus Chaetoceros (Bacillariophyceae) in the Plankton from the Southern Gulf of Mexico was published on January 1, 1998 in the journal Botanica Marina (volume 41, issue 1-6).
The photopyroelectric technique has been used to study the specific heat, the thermal conductivity, and the thermal diffusivity at the smectic-$A$--nematic phase transition of homeotropic and planar samples of 4-$n$${\ensuremath{-}\mathrm{p}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{y}\mathrm{l}\mathrm{p}\mathrm{h}\mathrm{…
PbTe single crystals were prepared by the Bridgman method, where either Ag2Te or PbI2 was doped as the source material of silver or iodine. The hole concentration was successfully controlled in the range from 2.0×1024 to 9.0×1024 m−3 by doping 100 to 700 mol ppm Ag2Te, and then the conduction type changed at 1000 mol…
A general model of foaming has been developed which relates the structure of a foam stabilised by viscoelastic forces to the bubble rupturing processes. For the specific case of negligible bubble coalescence within the foam it has been shown that, in the region of linearity between the foam height and gas flux, the re…
Lanthanide complexes of macrocyclic monoamidetris(phosphinate) ligands are partially hydrated in aqueous solution. Introduction of a chiral centre into the amide group leads to the formation of only two non-interconverting complex diastereoisomers (2∶1 for α-phenylethyl and 4∶1 for α-1-naphthylethyl). Proton, 31P NMR…
Metal derivatives (CuII, NiII) of monooxa-, dioxa- and oxathia-tetraphenylporphyrins and their one-electron oxidised and reduced species have been studied. Electronic spectra of the monooxa and oxathia derivatives exhibit split Soret bands and a complicated pattern of Q-bands revealing their lower symmetry. The spectr…
The dielectric breakdown of air insulating systems is believed to be sensitive to local irregularity of the electric field which may result from the presence of defects such as contaminants adhering to electrode surfaces and surface roughness. Normally metal machining methods are used to eliminate such electrode surfa…
The novel polyoxothioanion [Mo9S8O12(OH)8(H2O)2]2– was prepared from the acido-basic condensation of four {MoV2S2O2} building units around a central {MoVIO6} octahedron, the anion was characterized by X-ray diffraction as a tetramethylammonium salt.
With anilines as the starting materials, a facile new synthesis of symmetrical trans-stilbenes, in particular of trans-4,4′-diiodostilbene, by (double) Heck reaction of arenediazonium salts with vinyltriethoxysilane is described.
A colorimetric assay and pyrolysis–gas chromatography–mass spectrometry (Py–GC–MS) were used to study chitin in a variety of fresh, laboratory decayed and fossil arthropod cuticles, the last ranging in age from Upper Cretaceous (approximately 65 Ma) to Holocene. The results of the colorimetric assay of chitin in fresh…
We describe a new approach based on pattern matching for lattice parameter measurements using convergent beam electron diffraction (CBED). Theoretical CBED patterns are calculated using the Bloch wave method. Both experimental and theoretical patterns are processed to enhance the geometric features, and then compared…
The preparation of microparticles of the biodegradable poly-DL-lactide (PLA) and polylactide-co-glycolide (PLGA) polymers using spray-drying technology was studied. Formulation parameters investigated include polymer type, polymer molecular weight, polymer concentration, and viscosity. Microparticles were characterize…
Dense, uniform, mullite coatings have been deposited by chemical vapor deposition on SiC substrates, using a AlCl3-SiCl4-CO2-H2 system. The typical coating microstructure consisted of a thin layer of nanocrystallites of γ-Al2O3 in vitreous silica at the coating-substrate interface, with columnar mullite grains over th…
Abstraet-The surface modification of high density polyethylene (HDPE) and polypropylene (PP) has been carried out by exposure to a DC glow discharge in air at different power levels of 5.28, 11, and 13 W. The surface energies of polymers exposed to glow discharge were estimated by measuring the contact angles of two t…
This short commentary presents the result of long molecular dynamics simulation calculations of the shear viscosity of liquid n-decane and n-hexadecane using the Green-Kubo integration method. The relaxation time of the stress-stress correlation function is compared with those of rotation and diffusion. The rotational…