Materials Literature
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The atomic configurations of sub-steps created on (111) growth surface of fee crystal by stacking faults with fault vectors 1/6〈112〉and 1/3〈111〉show that they can act as growth step sources. Growth kinetics of stacking fault growth mechanism has been analysed. It has been shown that the nucleation barrier at the sub-s…
Abstract
The Transient Reactor Test Facility (TREAT) at Argonne National Laboratory-West (ANL-W) is fueled with urania in a graphite and carbon mixture. This fuel was fabricated from a mixture of graphite flour, thermax (a thermatomic carbon produced by ''cracking'' natural gas), coal-tar resin and U/sub 3/O/sub 8/. During the…
Infrared spectra are reported of ammonia, nitrogen and nitric oxide adsorbed on Fe/SiO2 with and without the addition of K2O promoter. Ammonia is coordinatively bound to the iron surface at ambient temperature and at high temperature decomposes to give adsorbed dinitrogen with an infrared band at 2180 cm–1. Dinitrogen…
This paper describes a method of determination of reverse recovery current parameters of the thyristor turnoff model, namely, the peak reverse recovery current and its decay time constant. The parameters are determined from a set of recovered charge curves, and another set of reverse energy loss curves, usually given…
The amino acid analysis was carried out in order to clarify the differences in keratin between the body hair and the hoof of horse. A distinctive mark was recognized in the content of amino acid residues between the body hair and the hoof. The contents of Asx, Gly, Ala, Ile, Leu, Tyr and Phe were higher and those of T…
The reaction of NO with [FeL]·thf, (1)(H2L = 5H, 14H-6,8,15,17-tetramethyldibenzo[b,i]-[1,4,8,11]tetra-azacyclotetradecine, thf = tetrahydrofuran) in thf led to a deep green cyrstalline solid [FeL(NO)]·thf, (2). The N–O stretching vibration at 1 636 cm–1(Nujol) is quite low, if compared to the other nitrosyi derivativ…
11B- and 10B-containing apatites were prepared from the system CaO-P2O5-B2O3 at 1000°C. The structure of borate groups was investigated by infrared spectroscopy based on isotopic frequency shifts. The boron-containing apatite has both BO2 and BO3 groups, but it does not contain BO4 groups. The BO3 groups occupy PO4 si…
Capillary rise, drop-weight, pendant-drop and ring methods which are originally deve- loped for surface tensions have been adapted to the measurement of interfacial surface tensions. Dropweight method is, however, frequently employed for the purp se. interfacial tensions usually lie between the ’ndividual surface tens…
The use of beryllium as a neutron multiplier for fusion reactor blankets has been analyzed. The analysis has been performed based on designs for a helium-cooled ceramic breeder and a self-cooled liquid-metal blanket, which have both been suggested for the Next European Torus reactor. It is shown that the use of beryll…
The structural change of 11 mol% MgO–ZrO2 by aging has been investigated using the dilatometric, X-ray diffraction and transmission electron microscopic techniques. Above 1413 K, the cubic ZrO2 decomposed to MgO+tetragonal ZrO2 eutectoidically. Below 1413 K, two kinds of decomposition have taken place. One is the prec…
We have investigated the nodular defect using computer simulations and experimental techniques. A modified version of the hard-disk model, in which the migration and attraction of atoms are introduced in simplified ways, is used to simulate the formation and development of nodules. This simulation reveals the self-ext…
New technologies constantly generate new demands for exotic materials to be used in severe environments. The rapid developments of aerospace industries during the last two decades have required new ma
Bi 2 O(SO 4 ) 2 cristallise dans le systeme monoclinique avec le groupe d'espace c2/c. Affinement de la structure jusqu'a 0,069. La structure est constituee d'ions Bi 4 O 2 8+ presque plans et d'ions SO 4 2− relies pour former un reseau tridimensionnel au moyen de fortes liaisons oxygene bismuth-sulfate
The reaction between commercial H2 and uranium metal leads to the formation of UO2 due to traces of water vapour or oxygen. When extremely pure H2 is used uranium hydride may be formed but, even with 99.9999% H2 uranium dioxide forms preferentially. The present work identifies the presence of UH3 in the X-ray photoele…
The core electron binding energies of eighteen compounds containing iodine in different oxidation states ranging from (-I) to (VII) have been measured. The observed chemical shifts differ from the literature data. The anticipated existence of hexavalent iodine in certain compounds has not been demonstrated. The relati…
This research demonstrates procedures useful in measuring the ability of fabrics to block heat transfer when in contact with a hot surface. Experiments show how the temperature of the contacting surface, contact pressure, and fabric moisture content affect protective insulation in conductive tests. Single-layer fabric…
An account is given of a yarn-on-yarn abrasion test developed for use on continuous–filament rope yarns. It involves application of a reciprocating motion to two yarn sections wrapped helically together under tension. Different modes of behaviour were found under more severe and less severe abrasion conditions. Tests…
The Mott formula relating the electron scattering factor to that for X-rays is inaccurate in its numerical form in the small-angle region. Effects of the inaccuracy on both kinematic and dynamical diffraction have been investigated. Some artifacts arising from the inaccuracy have been found in simulated electron micro…
The compound MnCu(obbz)·H2O [obbz = oxamido bis(benzoato)], obtained by reaction of the Mn2+ ion with the copper(II)‘brick’[Cu(obbz)]2–, orders ferromagnetically at Tc= 14 K; below Tc it exhibits a hysteresis loop characteristic of a soft ferromagnet.