Materials Literature
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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
The utility of a noncontact photoconductive decay (PCD) technique is demonstrated in measuring the bulk lifetime, /spl tau//sub B/, and surface recombination velocity, S, in detector grade silicon and germanium crystals. We show that the simple analytical equations which relate the observed effective lifetimes in PCD…
A lanthanum coordination compound with glycine {[La(Gly)3·2H2O]·(ClO4)3}n (Gly = NH+ 3-CH2-COO−) was synthesized and obtained in the form of single crystals. Its X-ray crystal structure has been determined and the IR spectrum has been studied. Crystallographic data for the compound are Mr = 698.6, triclinic, space gro…
The paper presents the results of ultrasonic and microwave dielectric investigations of the ferroelectric PbHPO4 in the vicinity of phase transition temperature. The largest anomaly of ultrasonic velocity and attenuation appears when ultrasonic wave propagates along the b-axis of the crystal. The ultrasonic velocity a…
A new approach to inhomogeneous layer synthesis is proposed that differs from the classical Fourier transform methods. This approach, based on the wave-number discretization of the continuous Q function, is described together with the relationship between the smoothness of the inhomogeneous layer’s refractive-index pr…
The reaction mechanisms and kinetics of endcapped ethynyl polyethers were studies in the temperature range 150-220C. The results obtained by ' 3 C and 'H NMR, FrTIR, HPLC and DSC indicate reactivity differences and competing reactions. These materials were cured and their thermal properties evaluated.
Dielectric, piezoelectric and pyroelectric response of selected compositions from this solid solution system have been investigated as a function of PT and BT content for compositions near the morphotropic phase boundary (PMT-PT). The dielectric constant and loss of poled samples were determined. Pyroelectric coeffici…
Single crystals of KBa 2 V 2 O 7 Cl were prepared by crystallization from flux. The transparent crystals crystallize with hexagonal symmetry, space group D 4 6h -P6 3 /mmc, a = 5.7688, c = 15.0762 Å. Z = 2. KBa 2 V 2 O 7 Cl is characterized by V 2 O 7 double tetrahedra and a statistical distribution of K + and Ba 2+ s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Mild and General Approach to the Preparation and Trapping of Highly Reactive FormylsilanesAlan R. Katritzky, Zhijun Yang, and Qingmei HongCite this: J. Org. Chem. 1994, 59, 17, 5097–5099Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Pu…
Abstract The degradation of a branched perfluoropolyalkylether (PFPAE) fluid with anhydrous AlCl 3 , in the absence of oxygen, has been re‐examined with emphasis on understanding the nature of the volatile products formed. GC/FTIR and GC/MS have been employed for identification of a number of compounds in the complex…
In situ x-ray photoelectron spectroscopy has been used to analyze the nature and extent of damage to the Si(100) surfaces bombarded with xenon ions in the energy range 0.25–2 keV. Dramatic changes in the Si 2p core levels were found upon ion bombardment. A curve-fitting analysis of the core level shows that an amorpho…
Abstract A technique for anodic composite-plating was developed. By this technique, PTFE composite-plated hydrophobic β-PbO2 electrodes were prepared, and their electrochemical properties as anodes were preliminarily examined.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain Conformations of Homopolymers Dissolved in a Microdomain of Diblock CopolymerYushu Matsushita, Naoya Torikai, Yasuhiro Mogi, Ichiro Noda, and Charles C. HanCite this: Macromolecules 1994, 27, 16, 4566–4569Publication Date (Print):August 1, 1994Publication History Publi…
Abstract Aromatic poly(ether‐ketone‐amide)s were prepared by the palladium‐catalyzed polycondensation of aromatic dibromides containing ether ketone units, aromatic diamines, and carbon monoxide. Polymerizations were carried out in N , N ‐dimethylacetamide (DMAc) in the presence of palladium catalyst, triphenylphosphi…