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。
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular weight and molecular weight distribution effects on the liquid-crystalline and biphasic behavior of a thermotropic polyesterMichele Laus, A. Sante Angeloni, Giancarlo Galli, and Emo ChielliniCite this: Macromolecules 1992, 25, 22, 5901–5906Publication Date (Print):…
J. P. Kociolek, D. B. Herbst, Taxonomy and Distribution of Benthic Diatoms from Mono Lake, California, U.S.A., Transactions of the American Microscopical Society, Vol. 111, No. 4 (Oct., 1992), pp. 338-355
The ultraviolet circular dichroism of a protein can be used to estimate the net fraction of its amino acids in different classes of secondary structure. Recent advances in the accuracy of such calculations have resulted from improved computational techniques, as well as extension of the spectral region analyzed to wav…
Polymer dispersed liquid crystal (PDLC) films with memory electrooptical characteristics were fabricated. The approach made use of phase transition characteristics of smectic liquid crystals. If a smectic is cooled from the nematic to the smectic state in the presence of an electric field, one obtains an aligned smect…
A series of amino- and hydroxytetraphenylporphyrin derivatives was found to have activity against the human immunodeficiency virus type 1 (HIV-1) in human peripheral blood mononuclear cells. Activity tends to be associated with increased hydrophilicity of the porphyrins for the porphyrins with one substituent on each…
Abstract Polyacrylonitrile (PAN) is soluble at room temperature in some ionic aqueous media and in many polar organic liquids such as dimethyl sulfoxide, but the polymer will not crystallize from these solvents. It is known, however, that PAN will from single crystals from dilute propylene carbonate (PC) solutions. It…
Thermotropic polymers containing charge‐bearing mesogenic moieties in the repeat unit are rare. This article reports a self‐assembly, two‐component approach for the preparation of side‐chain liquid‐crystalline polymeric materials possessing charged hydrogen‐bonded mesogenic groups. A unique feature of this system is t…
Regulations are continually being passed that limit the volatile organic content (VOC) of elastomer coating systems. Because of this restriction, high solids, two-component spray elastomers and coatings are attaining in creases in market interest and sales volume. As this interest grows, the research and development e…
Crystals of the 1:3 complex between antimony triiodide and sulfur, SbI3 * 3S8, are found to possess a high second-order optical nonlinearity. The powder second-harmonic generation efficiency is found to be approximately half of that of the isostructural complex of iodoform with sulfur, CHI3 * 3S8. Second-harmonic gene…
Abstract Differential scanning calorimetry (DSC) was used to study the effects of melt history on the isothermal crystallization kinetics of poly(phenylene sulfide) (PPS). Crystallization of the polymer was shown to be permanently altered by both the time and the temperature spent in the melt. Suggested explanations a…
We discuss simulations using a recently derived Monte Carlo method which generates the isoenthalpic-isotension-isobaric ensemble or HtN ensemble of classical statistical physics. This method is the Monte Carlo counterpart of the Andersen-Parrinello-Rahman HtN form of molecular dynamics. As an example of the use of HtN…
Abstract Authigenic chlorites and illites coexisting in clastic reservoir sandstones have been studied by energy dispersive X-ray spectroscopy (EDS) in the transmission electron microscope (TEM). All 16 samples studied are drill or sidewall cores from sandstones of relatively uniform age situated offshore Norway with…
Recently, we amplified the Lactobacillus bulgaricus NAD(+)-dependent D-lactate dehydrogenase gene by the polymerase chain reaction, cloned and overexpressed it in Escherichia coli (Kochhar, S., Chuard, N., and Hottinger, H. (1992) Biochem. Biophys. Res. Commun. 185, 705-712). Polymerase chain reaction-amplified DNA fr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of the porphyrin macrocycle on the spectroscopic properties and catalytic activity of electroreduced nickel(II) porphyrinsK. M. Kadish, M. M. Franzen, B. C. Han, C. Araullo-McAdams, and D. SazouCite this: Inorg. Chem. 1992, 31, 21, 4399–4403Publication Date (Print):Oc…
We investigated ${\mathrm{Pr}}_{2}$${\mathrm{BaO}}_{4}$ and ${\mathrm{PrBaO}}_{3}$ by several complementary experimental techniques. ${\mathrm{PrBaO}}_{3}$ crystallize in an orthorhombic structure. dc and ac susceptibility measurements exhibit irreversibility phenomena below ${\mathit{T}}_{\mathit{N}}$=11.7 K and reve…
The recently developed dynamic plane source (DPS) technique for simultaneous determination of the thermal properties of fast thermally conducting materials with thermal conductivities between 200 and 2 W/mK has now been extended for studying relatively slow conducting materials with thermal conductivities equal or bel…
Abstract A critical demand in environmental modeling and a desirable but elusive goal of research on the ion exchange properties of the charged solid surface has been to determine the selectivity coefficient from fundamental properties of the ions and surface. We developed a Hard and Soft Acid and Base (HSAB) Model to…
Abstract X-ray photoelectron spectroscopy (XPS) has been used to characterize the bonding state of Cu 2+ , Si 4+ , Al 3+ , and O 2− ions in structural (octahedral and interlamellar) or adsorbed position in phyllosilicates. Five smectites, 5 kaolinites, and 1 chrysocolla with Cu(II) in known positions (octahedral, inte…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation D. W. Adrian, A. J. Giacomin; The quasi‐periodic nature of a polyurethane melt in oscillatory she…
An efficient algorithm is developed to numerically compute solutions of problems related to crystal growth. The method is based on an integral equation formulation that involves an integration over the entire history of the growth. A direct calculation of this memory integral becomes more costly as time increases, but…