The crystal structure of norbornane
The Crystal Structure of the low-temperature, ordered phase of norbornane has been solved and refined from high-resolution powder X-ray diffraction data collected using synchrotron radiation.
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Mathematical models of the initial stage of the thermal degradation of poly(vinyl chloride). II. The thermal degradation of poly(vinyl chloride) with effective removal of HCl
Abstract The dehydrochlorination of different samples of PVC under vacuum with continuous removal of HCl by freezing, has been studied at 180–210°C. The comparison of the kinetic curves of the dehydrochlorination of various samples of PVC which were obtained by us and other investigators, with the theoretical curves f…
Irradiation performance of nitride fuels
The properties and advantages of nitride fuels are well documented in the literature. Basically the high thermal conductivity and uranium density of nitride fuels permit high power density, good breeding ratios, low reactivity swings, and large diameter pins compared to oxides. Nitrides are compatible with cladding al…
Effect of Si and Ca Addition on Delayed Fracture of High-strength Steels
Effects of Si and Ca addition on delayed fracture of medium carbon steels with 1400N/mm2 strength were investigated. Silicon and calcium were added at concentrations of 02.0% and 3070ppm, respectively. The delayed fracture characteristics were evaluated by FIP (Fédération Internationale de la Précontrainte) test which…
A new generation of sucrose products made by cocrystallization
Crystallisation of sucrose in the presence of a second ingredient produces microsized crystal agglomerates with awide variety of functional properties
In situ observation of crystal growth from solution
Crystal growth from solution has been investigated by means of in situ observation. Phase-sensitive microscopy or microinterferometry has been employed in order to understand the kinetics of step motion and the effects of flow dynamics on the crystal growth. Both dislocated and dislocation-free crystal were used as th…
The structure analyses of pyrope (Mg3Al2Si3Ol2) and grossular (Ca3Al2Si3O12) glasses by X-ray diffraction method.
The structures of Mg3Al2Si3O12 and Ca3Al2Si3O12 glasses were investigated by means of the radial distribution function (RDF) analysis based on X-ray diffraction data. The Al and Si atoms in these glasses are essentially in four-fold coordination. The T–O (T=A1 and Si) distance of Mg3Al2Si3O12 glass (1.68Å) estimated f…
Synthesis and microcrystal structure determination of [Au10(PPh3)7{S2C2(CN)2}2] with monochromatic synchrotron radiation
The structure of this high nuclearity gold cluster has been determined from a single microcrystal of dimensions 10 × 10 × 30 µm (the X-ray diffraction data were recorded with synchrotron radiation using an Enraf-Nonius area detector diffractometer at Daresbury Laboratory); in the cluster three trigonal bipyramidal Au5…
Composition and Application of Coatings Based on Boron Nitride
The composition and p roperti es of boron nitride coatings are described. They can be used to coat and protect metallic and ceramic components used at elevated temperatures. For this purpose, the propert ies of boron nitride as well as the demands placed on starting materials in the producti on of such coatings are di…
Redox reactions between cations of different polyvalent elements in glass melts : an optical basicity study
Redox data are currently available for each of the pairs Fe 2+ /Fe 3+ , Cr 3+ /Cr 6+ , As 3+ /As 5+ , Sn 2+ /Sn 4+ , Ce 3+ /Ce 4+ and Cu + /Cu 2+ , in equilibrium with oxygen as oxide(-II) and O 2 , for alkali and alkaline earth silicate melts at 1400°C in air atmosphere. For each redox pair, there exists an almost li…
Hydride Formation in Mg/Ni-Sandwiches Studied by Hydrogen Profiling and Volumetric Measurements*
Article Hydride Formation in Mg/Ni-Sandwiches Studied by Hydrogen Profiling and Volumetric Measurements* was published on January 1, 1993 in the journal Zeitschrift für Physikalische Chemie (volume 181, issue 1-2).
Dissolution behavior of the barrier layer of porous anodic films formed on aluminum studied by pore-filling technique.
Dissolution behavior of the barrier layer of porous anodic films formed on aluminum after immersion in sulfuric acid has been studied using re-anodizing (pore-filling) technique. The higher a forming voltage is, the higher the dissolution rate of a film. The barrier layer of films formed in phosphoric acid was divided…
Optimization of Anodic Silicon Oxide Films for Low Temperature Passivation of Silicon Surfaces
Electrochemical and electrophysical methods are used for optimizing anodic oxide films as passivating layers for electronic devices. Under certain conditions the electrophysical properties of thermally and anodically grown films are practically identical. For several years such anodic oxide films have been applied for…
Fluorescent dye guest-host effects in advanced ferroelectric liquid crystals
Previous work has shown that guest-host ferroelectric systems incorporating dichroically absorbing dyes are suitable for use in colour display applications. These utilize either the dichroic absorption of a conventional dye, or the emission of a fluorescent dye. We present here the electrooptical properties of several…
Synthesis and magnetostructural characterization of dinuclear copper( II ) complexes with the diazine ligand, 3,6-bis(di-2-pyridylmethyl)pyridazine
The crystal structures of [Cu2(bdpdz)Br4]·2CH3CN 1, [Cu2(bdpdz)Cl3(H2O)]Cl·3.5H2O 2 and [Cu2(bdpdz)2][ClO4]43 were determined by X-ray analysis, where bdpdz, represents the binucleating ligand 3,6-bis(di-2-pyridylmethyl)pyridazine, formed by the reaction of 3,6-dichloropyridazine and di-2-pyridylmethyllithium. Compoun…
Fission Gas Behavior during Postirradiation Annealing of Large Grained UO2 Fuels Irradiated to 23GWd/t.
Abstract Fission gas behavior of UO2 fuel pellets with controlled microstructure irradiated to 23 GWd/t in a test reactor has been studied by using a postirradiation annealing experiment. Four types of fuel pellets with or without additives were examined : (1) un-doped standard (grain size: 16/μm), (2) un-doped large…
Metastable Solution Structures of Spirobenzoselenazolinobenzopyrans and Their Negative Photochromic Properties
Abstract A series of photochromic 6′-nitro-3-octadecylspirobenzoselenazolinobenzopyrans have been newly prepared and their solution structures of the colored form have been confirmed as 3-octadecylbenzoselenazolenium-2-trans-1′-cis-(5′-nitrostyryl-2′-oxide) by selective partial deuteration and NMR techniques. Photochr…
Thermodynamic integration calculations of binding free energy difference for Gly‐169 mutation in subtilisin BPN′
The binding free energy difference for the Gly-169-->Ala-169 (G169A) mutation in subtilism BPN' complexed with a tripeptide substrate analogue is explored using the thermodynamic integration approach. The structure of the mutant enzyme-substrate complex obtained from free energy simulation is in good agreement with ex…
A Two-dimensional Model of the Mechanical Properties of Textiles
A two-dimensional model of the mechanical properties of textiles is constructed, and the relations between model parameters and model behaviour are studied. The influence of the number of bonding sites in the model on stress-strain curves, on the CPU time consumption, and on the stability of model outputs is described…
One Dimensional Constitutive Behavior of Shape Memory Alloys.
A one-dimensional constitutive model for the thermomechanical behavior of shape memory alloys is developed based on previous work by Liang and Tanaka. An internal variable approach is used to derive a comprehensive constitutive law for shape memory alloy materials from first principles without the assumption of consta…