Materials Literature
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Rates of the recovery of tritium from a blanket of a fusion reactor with a 1 GWt power are estimated. The recovery methods are a permeation window, a Flibe-He counter-current-extraction tower and a rotational centrifugal flow system. There is high possibility in that the rate-determining step of the permeation window…
The coordination environments of Pt impurities in a ternary K‐aluminophosphate (KAP) glass and commercial K,Mg‐aluminophosphate (KMAP) laser glasses have been investigated by Pt L III ‐edge X‐ray absorption fine structure (XAFS) spectroscopy. Pt valence in the KAP glass depends on the melt preparation atmosphere. Pt 4…
The influence of the interstitial elements H, B, C, N and O on the bulk modulus and the theoretical strength of alpha-Ti was investigated using the discrete variational method under the local density approximation from first principles. The electronic structure and the total and binding energies were first evaluated w…
At the Tritium Laboratory of the Forschungszentrum Karlsruhe (TLK) an experimental facility is running which is designed for the intercomparison of several hydrophobic catalysts for use in an liquid phase catalytic exchange (LPCE) column. The catalysts under comparison are from Russia, Belgium and Romania. The interco…
The degradation pathways for polymeric materials and coatings under the influence of light and oxygen are presented and the consequent need for light-protecting agents (light stabilisers) is discussed. The mechanisms of action of hindered amine light stabilisers and certain UV-absorbers are explained. The use of light…
In a previous article, a sharp change in the birefringence and density of polypropylene fibers was reported at the edge of thermal point bonds in nonwovens. In this article, similar results are shown for polyester nonwovens. First, in both isotactic polypropylene (ipp) and poly(ethylene terephthalate) (PET), the morph…
Themorphologies and structures of single crystals of syndiotactic poly(propene- co -1-butene) (PPBU) with 1-butene contents of 2.6, 4.2, 9.9, 16.2, and 47.9 mol % are studied by transmission electron microscopy and electron diffraction. The electron diffraction results show that the 1-butene units are included in the…
While nonrandom associations between zygotes at different loci (zygotic associations) frequently occur in Hardy-Weinberg disequilibrium populations, statistical analysis of such associations has received little attention. In this article, we describe the joint distributions of zygotes at multiple loci, which are compl…
Zinc selenide is an infrared transparent semiconductor material being considered for use in space as an infrared optical coating. In this work, zinc selenide thin films of different thicknesses were exposed to an electron cyclotron resonance generated oxygen plasma, often used to “simulate” the low earth orbital envir…
Micromachining of crosslinked PTFE (polytetrafluoroethylene) using synchrotron radiation direct photo-etching method has been demonstrated. High aspect-ratio microfabrication was carried out. The etching rate of crosslinked PTFE was higher than that of non-crosslinked PTFE. Through the etching rate measurements of var…
We have performed numerical calculations to study the generation of arbitrary temperature profiles with high spatial resolution on the surface of a solid. The characteristics of steady-state distributions and time-dependent heating and cooling cycles are examined, as well as their dependence on material properties and…
Electrochemical potentiodynamic polarizations, electrochemical corrosion potential (ECP) measurements and slow strain rate tensile (SSRT) tests were conducted to investigate the intergranular stress corrosion cracking (IGSCC) characteristics of Type 304 stainless steels treated with inhibitive chemicals in simulated b…
Pt/SiO 2 nanosized particles have been synthesized using a reverse micelle technique combined with metal alkoxide hydrolysis and condensation. The size of the particles and the thickness of the coating can be controlled by manipulating the relative rates of the hydrolysis and condensation reactions of tetraethoxysilan…
Arsenic pentachloride has a trigonal bipyramidal structure in the solid state with As-Cleq = 210.6, 211.9 pm, As-Clax= 220.7 pm, space group Pmmn, a = 706.2 (1); b = 760.3 (2), c = 623.3 (1) pm. Antimony pentachloride exists in two modifications: above −54.1 °C it is also trigonal bipyramidal with Sb-Cleq = 227.0 and…
The goals of the Storage and Delivery System (SDS) of the ITER Tritium Fuel Processing Plant are 1) safe storage of tritium-deuterium (DT) mixtures in reservoirs and in metal tritide beds with in-bed accountancy, 2) supply of various DT mixtures with DT and T2 flow rates up to 200 and 100 Pam3s−1 and of pure gases (He…
Thermal-responsive shape-memory polyurethane consists of two phases, a thermally reversible phase for maintaining a transient shape and fixed phase structure for recovering the original shape. The use of shape memory polyurethane in clothing is a novel concept. The aim of this paper is to introduce the application of…
Abstract A bonding model, valid for alimited group of borates, is formulated which allows the ratio of triangularly to tetrahedrally coordinated B atoms to be calculated from the chemical formula. The anion complex, which is formed by covalently bound atoms, has non-directed ionic bonds with the surrounding cations. T…
The first experimental investigation of a normal-incidence Mo-Y multilayer-coated diffraction grating operating at a 9-nm wavelength is reported. The substrate is a replica of a concave holographic ion-etched blazed grating with 2,400 grooves/mm and a 2-m radius of curvature. The measured peak efficiency in the -3 ord…
Single‐phase glasses containing 37.5 mol% Y 2 O 3 , 7 mol% La 2 O 3 , and 1 mol% Pr, Ho, Nd, Er, Sm, Tm, Eu, or Yb oxide substituted for part of the Y 2 O 3 were synthesized by containerless melting. The spectral transmission and absorption cross sections of the glasses were determined at wavelengths from 360 to 3300…
The synthesis and liquid crystalline properties of a new series of amides (series 2a-f,3a-d and 4a-d) incorporating pyridine and 1,3,4-thiadiazole rings are reported. No homologues of the series 2 show mesomorphic properties. In the series 3 only the highest homologues (3d) displays an enantiotropic SmA mesophase; the…