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。
We review the results of electrical conduction and breakdown research reported mainly after 1980 in Japan, and comment on the present situation and future prospect of research work in this field. Effects of introduction of polar groups into polymers on electric strength F/sub b/ are summarized. Influences of copolymer…
To elucidate the degradation mechanism of poly(lactic acid), the decrease in the intrinsic viscosity of poly(D,L-lactide) in a homogeneous water/ acetone solution was investigated. The hydrolysis of poly(D,L-lactic acid) in water/acetone solution can be catalyzed by protons. The molecular weight degradation of solid p…
The PZT/ferrite composite materials of different types of connectivity were prepared and investigated. The firing of powder mixtures, hot pressing, alternative slicing of piezoelectric ceramic and ferrite and other techniques were used to produce the magnetoelectric composites. The most high values of the magnetoelect…
Liposomes have been investigated for use as drug carriers, and many previous studies have demonstrated enhanced efficacy of encapsulated drugs and the reduction of the side effects of drugs so entrapped. In many cases liposomal drugs are administered via the bloodstream. The stability in the bloodstream, clearance, an…
The crystal structure of lithium bis(trifluoromethanesulfonimide)[LiN(CF3SO2)2] has been solved from X-ray powder diffraction data and refined by the Rietveld method. The salt crystallises in the orthorhombic system, space group Pnaa, a= 9.6351(2)Å, b= 5.4154(1)Å, c= 16.2639(3)Å. The anion, previously uncharacterised…
Bone crystals are particularly small and hence estimating their sizes have proved to be difficult and values obtained inconsistent. Here we use rat bone crystals of different ages, as well as different synthetic carbonate apatite crystals, to compare two methods commonly used for determining bone crystal sizes. One me…
CO has been adsorbed in doses at room temperature by ceria which had been reduced with CO and then evacuated at 873 K, or only evacuated at this temperature, as well as by a Pd/CeO2 catalyst, H2-reduced and evacuated at 823 K. From comparison of the observed IR spectra with literature results concerning matrix-isolate…
The diffuse reflectance spectra of a series of chromium-supported silica aluminas, with varying SiO2 content, have been investigated before and after drying and after calcination, successive CO reductions, and recalcination. The molecular structure of chromium before drying is influenced by the isoelectric point (IEP)…
The metalation of toluene (PhCH3) with a 1: 1 mixtureof n-BuLi/MOtBu (M = K, Rb) at ambient temperature affords orange-red powders of benzylpotassium or benzylrubidium. On addition of N,N,N’,N“,N“-pentamethyldiethylenetriamine (PMDTA) the precipitates dissolve to give burgundy-red solutions, from which needles of [PhC…
Reliability and Electromigration Degradation of GaAs Microwave Monolithic Integrated Circuits (A. Christou). Simulation and Computer Models for Electromigration (P. Tang). Temperature Dependencies on Electromigration (M. Pecht & P. Lall). Electromigration and Related Failure Mechanisms in VLSI Metallizations (A. Chris…
The correlation between the Raman peak shift and the linewidth of porous silicon is studied. The experimental result does not fit with the relationship predicted by the phonon confinement model. By taking into account both the phonon confinement and the effect of strain, the calculated Raman line shape coincides fairl…
Grain protein-based films containing mixtures of glycerin and polyethylene glycol (PEG) as plasticizers were prepared and evaluated for water vapor permeability (WVP), tensile strength (TS), and elongation (E). Changes in mechanical properties during storage were also studied. The PEG produced opposite trends in E of…
The in vitro degradation of samples of L- and D,L-lactic acid polymers, P(L)LA and P(DL)LA respectively, having different molecular weights, morphology and/or geometry, has been studied through the determination of viscometric molecular weight, mass and mechanical properties as function of the immersion time in Ringer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLamellar phase of a symmetric triblock copolymerM. W. Matsen and M. SchickCite this: Macromolecules 1994, 27, 1, 187–192Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs.acs.org/doi/10.1021/ma00…
A single LiB/sub 3/O/sub 5/ crystal cut normal to x(=a) and z(=b) can be used for the 90/spl deg/ phase-matched SHG at 0.475-0.875 /spl mu/m by heating the crystal from /spl sim/20 to 320/spl deg/C. The improved Sellmeier's equations and new formula of the temperature variation of the refractive indexes are presented.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZeolite encapsulated cobalt(II) and copper(II) perfluorophthalocyanines. Synthesis and characterizationKenneth J. Balkus Jr., Alexei G. Gabrielov, Stephen L. Bell, Fethi Bedioui, Lionel Roue, and Jacques DevynckCite this: Inorg. Chem. 1994, 33, 1, 67–72Publication Date (Prin…
Epidermal keratinocytes are ideal as a model system for the study of mammalian differentiation because primary cells have a high proliferative capacity and can be cultured under conditions enabling a balance of growth and differentiation. In addition, epidermal keratin genes have been cloned and characterized, and the…
Abstract The knowledge of starch pastes behavior during frozen storage becomes necessary to understand more complex systems (e.g. sauces, dressings and desserts) The effect of sub‐zero storage on the quality attributes of corn starch pastes (10% w/w) with and without xanthan gum (0.3% w/w) was analyzed. Pastes were fr…
Dielectric properties of relaxor ferroelectrics are characterized by giant and temperature-insensitive dielectric constants and large frequency dependence (dielectric relaxation), and therefore useful for high permittivity capacitors. Relaxor ferroelectrics also reveal superior characteristics in electrostriction and…
Abstract Layer charge is recognized as the single most important characteristic of 2:1 phyllosilicates. It indicates a mineral's capacity to retain cations and to adsorb water and various polar organic molecules. The affinity of organic-clays for sorption of organic contaminants in aqueous systems is now attracting co…