Materials Literature
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Two types of diamagnetic luminescence centers were found in VAD SiO 2 glass sintered under reducing atmospheres. One of the PL centers, which had an excitation band at 5.17 eV (240 nm) and two emission bands, at 4.2 eV (295 nm) and 3.1 eV (400 nm), was mainly detected in the glasses sintered under H 2 /He atmosphere.…
Abstract Acrylic monomers were graft copolymerized onto gelatin chains using potassium persulfate in aqueous medium. The graft copolymers were then treated with glutaraldehyde to establish crosslinks between gelatin macromolecules. This yielded a rigid water insoluble protein network sporting grafted chains at random.…
Abstract A finite element algorithm is presented for simultaneous calculation of the steady state, axisymmetric flows and the crystal, melt/crystal and melt/ambient interface shapes in the Czochralski technique for crystal growth from the melt. The analysis is based on mixed Lagrangian finite element approximations to…
Our studies, which are aimed at understanding the catalytic mechanism of the beta subunit of tryptophan synthase from Salmonella typhimurium, use site-directed mutagenesis to clarify the functional roles of several putative active site residues. Although previous chemical modification studies have suggested that histi…
Abstract Hydrolyses of selected soluble polysaccharides (e.g., polyoses) and disordered and crystalline celluloses, each bearing 2‐diethylaminoethyl (DEAE) substituents at low degree of substitution (DS < 0.05) were explored in 100% and 2 N trifluoroacetic acid (TFA). Analyses were evaluated relative to hydrolysis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and magnetic studies of electrochemically crystallized halides of 1,4,5,8-tetraselenonaphthalene (TSeN)Lewis A. Acampora, Boris S. Elman, Daniel J. Sandman, Susan Jansen, M. Thomas Jones, Raymond D. Rataiczak, and Bruce M. FoxmanCite this: Inorg. Chem. 1989, 28, 8…
Molecular-dynamical calculations show that bcc metals are classified into two groups [(Mo, W, Fe) and (V, Nb, Ta)] concerning the configurations of irradiation-produced point defects. The potentials used are those constructed from elastic constants by Johnson and Wilson. In the first group, the stable interstitial pro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and crystal structure of (hexamethyldibenzotetraazaannulenato)nickel-TCNQ. A mixed-stack donor-acceptor molecular solidPeter J. Spellane, Leonard V. Interrante, Rudolph K. Kullnig, and Fook S. ThamCite this: Inorg. Chem. 1989, 28, 8, 1587–1590Publication Date (Prin…
Solute transport in Czochralski (CZ) crystal growth and in magnetic Czochralski (MCZ) with a vertical applied field are simulated numerically, and compared with published experimental data on gallium segregation in silicon growth. In the MCZ cases, the low segregation coefficient of 0.008 leads to a steep concentratio…
"Heterojunctions" have been fabricated by the reactive evaporation of thin film n-type ZnO onto p-type single crystal Zn 3 P 2 , polycrystalline films of Zn 3 P 2 , and single crystal CdTe. The photovoltaic response of the n-ZnO – single crystal p-CdTe devices was good, that of the n-ZnO – single crystal p-Zn 3 P 2 de…
The effect of continuous additions of sodium hypochlorite (NaClO) on the localized corrosion resistance of stainless steels (SSs) exposed to natural seawater flowing at 1.5 m/s has been studied in field tests lasting 75 days. Residual chlorine of 0.1 to 0.2 ppm and 1 to 2 ppm in seawater were tested. The continuous pr…
Several models of shield wire were tested with the Shiobara HVDC (high-voltage direct current) test line. The models contain typical standard wires that are generally used to reduce field effects at ground level, neutral conductors placed at lower parts of the DC line, and an earth corona model to intentionally cancel…
Mixed azomethine mononuclear copper (II) complexes of the type [CuLL'] where, L = 1-phenyl-3-methyl-4-benzoylimine-2-pyrazolene-5-ol and L'[dbnd]acetylacetonimine or benzoylacetonimine or dibenzoylmethanimine or L = acetylacetonimine and L' = benzoylacetonimine or dibenzoylmethanimine or L = benzoylacetonimine and L'…
Abstract The details of an unscheduled polymerization of acrylic acid initiated by indirect heating have been characterized by in‐depth analysis of the polymer, kinetic and thermodynamic calculations, and heat and material balances on the system. The data fit together to give a consistent picture of the polymerization…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic structures and properties of .alpha.-chromium phosphate and .alpha.-chromium arsenateJ. Paul Attfield, Peter D. Battle, Anthony K. Cheetham, and David C. JohnsonCite this: Inorg. Chem. 1989, 28, 7, 1207–1213Publication Date (Print):April 1, 1989Publication History P…
In this paper a comparative analysis on the energetics of ester type plasticizers such as dioctyl adipate (DOA), dioctyl phthalate (DOP), dibutyl sebacate (DBS), isodecyl pelargonate (IDP), trioctyl
Abstract The tensile strength degradation of nylon 66 and Kevlar 29 yarns was studied at elevated temperatures and over a broad range of relative humidities. The degradation rates for nylon are initially slow but increase rapidly, suggesting the depletion of an inhibitor. Kevlar showed no evidence for similar inhibito…
The deformation at room temperature of thick (ca. 2 mm) and thin (ca. 1000 Å) films of polybutene was characterized by electron microscopy and electron x-ray diffraction. The thin films, as studied, draw by micronecking whereas the thick films draw uniformly. In both types of samples the details of the deformation pro…
In‐situ ellipsometry at a wavelength of 632.8 nm is used to analyze silicon surfaces in an aqueous ambient. The ellipsometric data indicate that a surface which is optically quite similar to bare Si is obtained when the native film is etched from a Si substrate by aqueous . In contrast, the surface obtained by etching…
Abstract The reaction of acetanilide derivatives with benzyltrimethylammonium dichloroiodate in acetic acid in the presence of ZnCl2 at room temperature or at 70 °C gave iodo-substituted acetanilide derivatives in good yields.