Materials Literature
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Abstract The processing of poly(imide) films from poly(amic acid) solutions involves the simultaneous loss of solvent and chemical conversion, and may involve structural reorganization such as orientation or crystallization. Here, we describe weight loss, solvent sorption. Fourier transform infrared (FTIR), and wide‐a…
A stress‐induced aging phenomenon is observed to occur at room temperature in deformation bands introduced into a 8.5 mol% ceria‐stabilized tetragonal zirconia/alumina (CeTZP/A1 2 O 3 ) composite by flexural loading. The aging occurs with time after unloading and in laboratory air. Over a period of 100 days, the conce…
Anaerobic sn-glycerol-3-phosphate dehydrogenase of Escherichia coli is encoded by an operon of three genes, glpACB. The promoter distal gene, glpB, encodes a 44-kilodalton polypeptide that is not part of the purified soluble dehydrogenase. By recombinant plasmid complementation, in a strain harboring a chromosomal del…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigations of the Chemical Interactions between Molecular Oxygen and Pristine (Undoped) PolypyrroleJunting Lei and Charles R. MartinCite this: Chem. Mater. 1995, 7, 3, 578–584Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published in…
We investigate a soliton charge and energy transport in anharmonic molecular systems and show that at large enough anharmonicity parameter there are two kinds of envelope solitons, one of which is a Davydov soliton. It has the usual one-bell shape and may exist at any anharmonicity. The other kind has a two-bell shape…
The 2M potassium chloride (KCl) extraction method used to measure soil nitrate (NO3 ‐‐N) concentrations in soils may introduce some artifacts caused by soil sampling, processing, and handling. Furthermore, this method provides soil NO3 ‐‐N concentrations for soil sampled at a particular time, whereas the dynamics of t…
Microhardness and optical properties changes induced by gamma-irradiation are studied in vitreous As2S3. The observed 10-25% microhardness increase’ the shift of the absorption edge to long wavelength accompanied with a decrease in its slope (radiation-induced darkening), as well as increasing of impurity bands intens…
Abstract Size-controlled CdS nanocrystallites were prepared by using thiophenol or hexanethiol as a capping reagent by controlling the ratio of Cd2+ to bis(trimethylsilyl) sulfide (S(TMS)2) as a source of the sulfide ion in reversed micelles. Their solubility and photocatalysis were examined. A series of size-controll…
The effect of applied potential on the stress corrosion cracking (SCC) behaviour of sensitized type 316 stainless steel (SS) in high temperature water containing 5 ppm chloride over the temperature range from 100 to 300 °C has been investigated using the slow strain rate test (SSRT) technique. The results are compared…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduction of Nicotinamides, Flavins, and Manganese Porphyrins by Formate, Catalyzed by Membrane-Bound Rhodium ComplexesJ. H. van Esch, M. A. M. Hoffmann, and R. J. M. NolteCite this: J. Org. Chem. 1995, 60, 6, 1599–1610Publication Date (Print):March 1, 1995Publication Histor…
Abstract The sol‐gel method is applied to prepare Cu + or Ag + containing alumina adsorbents which have potential application in purification or separation of carbon monoxide or olefins containing gases. Wet impregnation and sol‐solution mixing methods are used to incorporate the active species into the sol‐gel derive…
The influence of load and dwell time on the subcritical growth of indentation cracks was investigated. The behavior of soda‐lime‐silica glass in both active and inert environments was considered. Vickers indentations were obtained.using loads ranging from 1.96 to 39.2 N and the dwell time.at maximum load was varied be…
The three-dimensional structure of narbonin, a seed protein from Vicia narbonensis L, has been determined at 1.8 A resolution. Phase information was obtained by multiple isomorphous replacement and optimized anomalous dispersion. The narbonin structure was initially traced with only 17% amino-acid sequence information…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, Vibrational Spectra, and Single-Crystal X-ray Structure of the Phosphato-Bridged Dinuclear Peroxovanadate (NH4)5[V2O2(O2)4PO4].cntdot.H2OPeter Schwendt, Jarmila Tyrselova, and Frantisek PavelcikCite this: Inorg. Chem. 1995, 34, 7, 1964–1966Publication Date (Print)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultinuclear NMR Study of Dipotassium Tetracyanometalates of the Group 12 Metals in the Solid StateGang Wu, Scott Kroeker, and Roderick E. WasylishenCite this: Inorg. Chem. 1995, 34, 6, 1595–1598Publication Date (Print):March 1, 1995Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and Modeling of Gas Formation in the Thermal Decomposition of Powdery Cellulose and Pine SawdustRafael Bilbao, Jesus Arauzo, and Maria L. SalvadorCite this: Ind. Eng. Chem. Res. 1995, 34, 3, 786–793Publication Date (Print):March 1, 1995Publication History Published…
Fragipans are a common feature in Pennsylvania, occurring in 30% of Pennsylvania' soils. These fragipans resist root penetration and are characterized by very coarse prismatic structure, firm to very firm brittle consistence, low permeability, bulk densities that are higher than overlying horizons, loamy textures, and…
Abstract Measurements of the kinetics of acid dissolution of synthetic aluminous goethites and corresponding hematites produced by heating of parent Al-goethites at various temperatures were carried out in 1 M HC1 at 30, 40 and 50 ° C. Dissolution-time curves show sigmoidal shapes for the goethites (110 ° C), whereas…
The synthesis of poly(p-methylstyrene)–polyisobutylene–poly(p-methylstyrene) triblock copolymer was accomplished by sequential monomer addition. The synthesis involves the living polymerization of isobutylene by the TiCl4/methylchloride:hexanes, 40:60 v:v/ −80°C system in the presence of di-tert-butylpyridine using di…
A method of improving the adhesion of carbon thin films deposited using a cathodic vacuum arc by the use of implantation at energies up to 20 keV is described. A detailed analysis of carbon films deposited onto silicon in this way is carried out using complementary techniques of transmission electron microscopy and x-…