Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleInfluence of entanglement on the dielectric normal mode process of cis-polyisopreneKeiichiro Adachi and Tadao KotakaCite this: Macromolecules 1984, 17, 1, 120–122Publication Date (Print):January 1, 1984Publication History Published online1 May 2002Published inissue 1 January 198…
Semi-Annual Progress Report April 30, 1984 through September 30, 1984 COMPOSITE STRUCTURAL MATERIALS Air Force Office of Scientific Research and National Aeronautics and Space Administration Grant No. NGL 33-018-003 Co-Principal Investigators: George S. Ansell Dean, School of Engineering Robert G. Loewy Institute Prof…
The adsorption of CO2 on alumina, alumina–magnesia mixed oxides and magnesia has been studied by means of i.r. transmission absorption spectroscopy. CO2 was found to be weakly adsorbed on accessible cations. With high densities of surface hydroxyl groups lateral interactions of these cationicly bound CO2 molecules wit…
Problems in solid-state physics , Problems in solid-state physics , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
The principal purposes of this article are (1) to draw attention to the fact that it has recently become possible to study representative internal lamellar microsmctures of melt-crystallized polyolefines with the transmission electron microscope; (2) to describe the new techniques which have made this possible and con…
From observation by microscope of DOBAMBC and mixtures of smectic C and cholesteric, a structure of Sm C* in planar samples has been determined as depending on the sample thickness d. In all samples there are unwound layers at the sample surfaces with dipole-moments directed from the surface to the sample bulk. In thi…
The air-stable compounds R[TcNCl4] and R[TcNBr4](R =[AsPh4]+ or [NBun4]+) have been prepared by the reaction of [NH4][TcO4] with NaN3 in the presence of concentrated HCl or of HBr. The e.s.r. spectra of [TcNCl4]– and [TcNBr4]– are typical of ions with a 4d1 electronic configuration and the unpaired electron in an orbi…
We present experimental investigations of two-dimensional crystallization of calibrated Brownian spheres in water. The interaction monitored by an external AC electric field is attractive in a wide range of frequency and leads to a clustering of fractal crystallites. The fractal dimension of the structure is measured…
Abstract Polythiophene and substituted polythiophene can be electrochemically generated as very adhesive thin films or as thick powdery deposits. The homogeneity of the thin films is very high, but it decreases when the film thickness is increased. Scanning electron microscopy shows that the nature of the dopant stron…
The oxidation ofa‐SiC single crystals and sintered α‐ and β‐SiC polycrystals has been investigated at elevated temperatures. Bubble formation is commonly observed in oxide scales on polycrystalline SiC but is rarely found on single‐crystal scales; bubbles result from the preferential oxidation of C inclusions, which a…
Vapor sorption data were obtained for the ethylbenzene–poly(ethyl methacrylate) system at 120°C. Successive step-change sorption experiments carried out at two-film thicknesses indicate the presence of maxima in the sorption curves. The fractional amount of overshoot decreased as the final pressure or weight fraction…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure and magnetic properties of a binuclear, pentacoordinate copper(II) complexThomas N. Sorrell, Donald L. Jameson, and Charles J. O'ConnorCite this: Inorg. Chem. 1984, 23, 2, 190–195Publication Date (Print):January 1, 1984Publication History Published onlin…
The relation between the glass transition temperature and the water content of wool can be described by the Fox equation. Data on transitions from a wide range of sources, including mechanical, dielectric, and calorimetric measurements, are well described by the equation. The utility of the relation for understanding…
N-Acetylneuraminate lyase [N-acetylneuraminic acid aldolase EC 4.1.3.3] from Escherichia coli was purified by protamine sulfate treatment, fractionation with ammonium sulfate, column chromatography on DEAE-Sephacel, gel filtration on Ultrogel AcA 44, and preparative polyacrylamide gel electrophoresis. The purified enz…
Coulometric titration technique has been employed for the determination of the parameter, P\ominus, defined as the oxygen partial pressure at which the n-type and ionic conductivities are equal, for various commercial zirconia electrolytes in the temperature range from 1243 to 1873 K. Measured values of the parameter,…
We report on elastic neutron scattering results showing that the intermediate phase of quartz existing in a 1.3 K range between the α and β phases is in fact incommensurate. Six satellites are observed around most Bragg peaks along the three [100] directions of reciprocal space. The modulation corresponds to the super…
Although clinical trials using macromolecular conjugates of cytotoxic drugs in a treatment of malignant disease are fragmentary at best, a number of carrier systems that have been examined in vitro, in tissue culture, and in vivo animal experiments demonstrate great promise and warrant further extensive examination. T…
To deepen our understanding of Ca2+-activation in calmodulin-dependent reactions, the properties of Ca binding to calmodulin were examined by dual-wavelength spectrophotometry using a Ca indicator, tetramethylmurexide. The Scatchard plot for Ca binding to calmodulin was linear, indicating the occurrence of homogeneous…
We present 1H and 77Se NMR relaxation data on oriented (TMTSF)2ClO4 single crystals in the relaxed state. The data show the existence of three distinct regimes for the nuclear relaxation rate T-11. In the high temperature part (T > 25 K) the Korringa law seems to be well satisfied whereas in the lower temperature part…
Abstract The changes in the structure and morphology of a random copolymer containing 92 mol % glycolide units and 8 mol % lactide units as a function of in vitro hydrolysis have been studied. A number of techniques, such as wide‐angle x‐ray diffraction, small‐angle x‐ray scattering, density measurements, infrared spe…