Materials Literature
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The HIS3+ gene of Saccharomyces cerevisiae was overexpressed in Escherichia coli and the recombinant imidazoleglycerol-phosphate dehydratase (IGPD) purified to homogeneity. Laser-desorption and electrospray m.s. indicated a molecular ion within 2 units of that expected (23833.3) on the basis of the protein sequence, w…
High‐purity (99.9%) yttrium oxide (Y 2 O 3 ) powder has been consolidated, either by vacuum sintering (VS) or by hot isostatic pressing (HIP). As the dense polycrystalline ceramics contained point defects, mainly oxygen vacancies, oxidation treatment was applied at 1500°C for 2 h. The two materials were compared with…
Abstract Foam and Foam Breaking – A Review. Many technical processes produce foams which complicate the performance of a given process or even make it possible. Foam breaking, therefore, becomes necessary. This paper outlines well known and new methods of foam breaking as well as the breaking principles. For the examp…
An investigation of adaptive hybrid composite cylinders utilizing active Shape Memory Alloy (SMA) composite layers for use in high-pressure vessel applications is presented. An analytical analysis using a linear elastic composite cylinder formulation shows that adapative SMA elements in a composite cylinder can be use…
Abstract We investigate criteria for craze failure at a crack tip and the dependence of craze failure on the molecular weight of the polymer. Our micromechanics model is based on the presence of cross‐tie fibrils in the craze microstructure. These cross‐tie fibrils give the craze some small lateral load bearing capaci…
The combustion and fire retardancy behaviour of polyacryloni trile and its fibre-forming copolymers have been studied using the cone calorimetry technique. The heat release rates of the polymers are characterised by two high peaks. The first one occurs at the beginning of flaming combustion while the other occurs clos…
Abstract Mineralogical studies of sedimentary rocks or sedimentary deposits are often required for engineering geological projects. X-ray diffraction analytical techniques are usually employed for this purpose but these methods are often complex and involved. Several different X-ray diffraction methods are described a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparing Mono- and Bimetallic Noble-Metal Catalysts in a Catalytic Membrane Reactor for Methylcyclohexane DehydrogenationJawad K. Ali and David W. T. RippinCite this: Ind. Eng. Chem. Res. 1995, 34, 3, 722–729Publication Date (Print):March 1, 1995Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThree New Polynuclear Bis(.mu.-phosphato) Vanadyl Clusters: [HB(pz)3VO(.mu.-(C6H5O)2PO2)]2, [HB(3,5-Me2pz)3VO(.mu.-(C6H5O)2PO2)].cntdot.C7H8, and H2O.cntnd.[t-Bupz(.mu.-C6H5OPO3)VO]6(H2O)2.cntdot.2CH3CH2OH. Adaptability of the Cyclic (OV)(OPO)2(VO) Bridging UnitMarcus R. Bon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSoot Formation over Zinc Ferrite High-Temperature Desulfurization SorbentEiji Sasaoka, Yukimasa Iwamoto, S. Hirano, M. Azhar Uddin, and Yusaku SakataCite this: Energy Fuels 1995, 9, 2, 344–353Publication Date (Print):March 1, 1995Publication History Published online1 May 200…
Abstract Linz‐Donawitz (LD) slag, containing 29% calcium (Ca), 21% iron (Fe), and 5% magnesium (Mg), is a by‐product of the iron and steel‐making industry. It is produced in large quantities in Europe and poses a substantial disposal problem. A field trial was conducted to study whether LD slag could be used as a dolo…
Pulsed laser-induced surface damage experiments were made on the cleaved (001) face of (−)2-(α-methylbenzylamino)-5-nitropyridine crystals at a pulse length of 25 ns FWHM. The highest single-pulse damage threshold value was 24.2 J/cm2 at 1064-nm wavelength for light polarized along the crystallographic a axis, whereas…
Summary X‐ray microtomography (XMT) is a non‐destructive technique that allows the internal structure of a material to be imaged by the spatial distribution of its linear X‐ray absorption coefficients. This paper demonstrates the use of XMT to investigate: (1) the distribution of TiB 2 reinforcement in composites form…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemisorption of Fluorine, Chlorine, HF, and HCl on the Diamond (100)2x1 Surface: An ab Initio StudyTerttu I. Hukka, Tapani A. Pakkanen, and Mark P. D'EvelynCite this: J. Phys. Chem. 1995, 99, 13, 4710–4719Publication Date (Print):March 1, 1995Publication History Published o…
Abstract Elastic moduli of the crystalline regions of cellulose triesters in the direction both parallel E l and perpendicular E t to the chain axis are measured by x‐ray diffraction. E l values for cellulose triesters are as follows: cellulose triacetate (CTA), 33.2 GPa; cellulose tripropionate (CTP), 21.6 GPa; cellu…
The effects of additives on the nonenzymatic deamidation of an Asn residue in a peptide and racemization of Asp and/or Asn in lysozyme were investigated at pH 6 and 100 degrees C. These chemical reactions were accelerated by the addition of phosphate ions. Several salts suppressed the deamidation in the presence of ph…
Abstract A series of experiments involving the combustion of inherently fire‐retarded compounds has been performed using the DIN 53 436 furnace. Six chlorinated compounds comprising four pesticides, an organic solvent, and polyvinyl chloride (PVC) have been investigated with the focus on the combustion efficiency expr…
A comparative study of transient photoconductivity and dark conductivity in the discotic liquid crystal hexahexyloxytriphenylene (HAT6) is reported. In both experiments the transport is dispersive, and the carrier mobilities are essentially identical demonstrating that the presence of the counterions in the chemically…
Broadband dielectric spectroscopy has been employed to study the electric charge transport and molecular dynamics in columnar stacks of liquid crystalline phthalocyanine derivatives, materials which are of interest as one‐dimensional semiconductors or as photoconductors. Three relaxation processes and a conductivity c…
Thin-film decoupling capacitors based on ferroelectric lead lanthanum zirconate titanate (PLZT) films are being developed for use in advanced packages, such as multichip modules. These thin-film decoupling capacitors are intended to replace multilayer ceramic capacitors for certain applications, since they can be more…