Materials Literature
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The method of X-ray crystallographic cryoenzymology has been used to determine the crystal structure of a kinetically significant species on the reaction pathway of a crystalline enzyme. The structure of a specific acyl-enzyme intermediate in the elastase-catalyzed hydrolysis of the N-carbobenzoxy-L-alanine p-nitrophe…
Abstract New polythioesters were obtained by interfacial polycondensation of bis(4‐mercaptomethylphenyl) sulfide with some aliphatic and isomeric phthaloyl dichlorides. To determine optimal conditions for polycondensation, the polythioester from bis(4‐mercaptomethylphenyl) sulfide and sebacoyl dichloride was chosen as…
The Raman spectra in the nanocrystalline Pb 1-x Sr x TiO 3 system show that the morphotropic phase transition from the tetragonal phase to the cubic structure occurs at x c =0.57 and it can be associated with 'softening' of the lowest-frequency E(TO) phonon mode. The phase transition temperature in Pb 0.8 Sr 0.2 TiO 3…
The growth morphologies of vicinal hillocks on K${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ {101} surfaces have been investigated using atomic force microscopy. Growth occurs on monomolecular steps both by step-flow and through layer-by-layer growth on both dislocation induced steps and 2D nuclei. Dislocation induced hilloc…
Band structure results for metallic corundum-phase V 2 O 3 feature narrow ( approximately 2.7 eV) t 2g conduction bands and a density-of-states peak at E F such that the heat capacity to band ratio is approximately 4.4. The predominant V(3d) character of conduction electrons suggests that transport properties will be…
Diamond has been found to grow from copper, zinc, and germanium when temperatures and pressures in excess of those usually used for growth via conventional catalysts are used. Around their melting temperatures these metals are inert with respect to graphite. However, under the conditions used in this study, namely tem…
We report the growth of thin carbon nitride films on Si(100) substrates at temperatures in the range of 100–700 °C using electron-beam evaporation of graphite assisted with electron cyclotron resonance (ECR) plasma generated nitrogen species. The effect of the substrate temperature, and the nitrogen flow on the compos…
Abstract The theory of the chemical bond has been much influenced by the structures that have been determined of certain key molecules. Single crystal X-ray diffraction is the most powerful and most widespread tool for determination of molecular structures, but it has a major disadvantage: the requirement of single cr…
Kinetic stability in water, good protection of the metal center, and strong luminescence of the metal ion make lanthanide complexes of the ligand 1 ([M⊂1]3+, M = Eu, Tb) promising as luminescent labels in fluoroimmuno-assays.
Cellulose microfibrils with an electron diffraction pattern characteristic of crystalline native cellulose I have been assembled abiotically by means of a cellulase-catalyzed polymerization of beta-cellobiosyl fluoride substrate monomer in acetonitrile/acetate buffer. Substantial purification of the Trichoderma viride…
Special types of concrete radiation shields that depend on locally available materials and have improved properties for both neutron and gamma-ray attenuation were developed by using plastic materials and heavy ores. The analytic hierarchy process (AHP) is implemented to evaluate these types for selecting the best bio…
Single crystals of the title compound have been obtained by neutralization of formic acid with solid rubidium carbonate and subsequent solvent evaporation at room temperature. The very hygroscopic crystals are orthorhombic, space group Pbca (Nr. 61), with a = 7.614(1), b = 17.926(2), c = 7.862(1) Å and Z = 8. The stru…
A BaCuO 2 single-crystal growth has been achieved on a porous BaCuO 2 ceramic substrate, where only the surface was melted and recrystallized under H 2 +Ar reducing atmosphere by pulse heating.
Recriticality is possible in a severe accident if unborated or low boron concentration water is added to a damaged core after control rod melting but before fuel melting. Recriticality in a severe accident in a boiling water reactor was parametrically investigated using the TWODANT code. Eigenvalue calculations for a…
We compare the structural, thermodynamic and dynamical behaviour of a model colloidal system with that of the equivalent atomic system using the simulation techniques of brownian dynamics and molecular dynamics. In the process we establish the important role made by solvent mediated many-body hydrodynamics on colloida…
The title ligand (hereafter abbreviated as BATTH) is composed of a triazenic and two triazolic functional groups. The synthesis of metal complexes of general formula [M(BATT)X] (M=Cu(II), X=CI, Br, I, SCN, CN; M=Pd(II), X=CI, Br), and of the intermediate product [Cu(BATT)H2O]NO3 are reported. These complexes (includin…
Article Hydrogen Embrittlement of Maraging Steel Tension Bolt / Wasserstoffversprödung eines Spannbolzens aus Maraging-Stahl was published on August 1, 1994 in the journal Practical Metallography (volume 31, issue 8).
Relaxation currents and electrical conductivity of TGS single crystal have been measured in the temperature range from–193 C to 125 C. Nitrogen–temperature studies of charging currents show that the respective relaxation times are of the order of 104–105 sekonds. The measurements of I–U characteristics indicate that f…
New shielding alloys for gamma rays have been developed from a mixture of Cu, Fe, Pb and A1. The temperatures for the formation of these alloys were detected and their structures analysed by means of an x‐ray diffraction spectrometer. The linear attenuation coefficients for the produced alloys at different thicknesses…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More