Materials Literature
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We present experimental and theoretical studies of the structures and transitions of the molecular orientation field of a smectic C* liquid crystal in the surface-stabilized geometry. The experimental results show that structures having from two to six stable orientation configurations are possible. The optical proper…
Papers were presented at the following sessions: Leaching Mechanisms; Materials Performance in Repositing Environments; Spent Fuel Studies; Geochemical Interactions; Natural Analogues; Radiation Effects; Research at the US Department of Energy Materials Characterization Center; Processing Technology; Materials Science…
A negative apparent adsorption onto activated charcoal has been observed for methyl alcohol, ethyl alcohol, n-propyl alcohol, n-heptane, methylcyclopentane and methylcyclohexane under pressures of 0.1–196.2 MPa and at temperatures of 298.2–348.2 K. The adsorption isotherm exhibits a straight line with a negative slope…
Abstract The dielectric properties, DC electrical conductivity, and I ‐ V characteristics of thin films of polyelectrolyte complexes formed by glycol chitosan (GlChi) with mucopolysaccharides chondroitin sulfate A (CSA), chondroitin sulfate C (CSC), and hyaluronic acid (HA) have been studied at different temperatures.…
A comparative study of the oxidation behavior of Zircaloy-4 versus austenitic stainless steel No. 1.4970 was performed in high-temperature steam. Nuclear reactor-type tube sections of both materials were exposed on both sides to superheated steam at temperatures ranging from 600 to 1300°C for up to 6 h. The specimens…
Seeds from three sympatric populations of Calotropis procera (Ait.) R. Br., identified on the basis of variation in coronal structure, were kept separately for germination under different environmental conditions. The general trend of percentage germination in laboratory conditions for the population was A-type > B-ty…
A phenomenological model has been developed for predicting iodine-induced stress-corrosion crack (SCC) initiation and growth in Zircaloy cladding. This model is capable of predicting various observed behaviors related to SCC. A recently developed submodel for predicting the effect of texture on SCC has been incorporat…
Least-squares analytical techniques are used to examine additivity relationships for combinedion thermodynamic data to effect appropriation into single-ion components for alkali-metal halide salts by employing Fajans' competition principle. Absolute free energies, enthalpies and entropies of hydration are derived lead…
Fatigue strength and fatigue crack growth rates in nickel-aluminum bronze alloys were measured in air and 3.0 % sodium chloride solution under a free corrosion potential. The effect of a corrosion inhibiting heat treatment (6 h at 700°C followed by air cooling) on fatigue strength and fatigue crack propagation rates i…
アルカリゲルマン酸塩ガラスのラマンスペクトルを測定した. 種々の構造単位を含むゲルマン酸塩結晶のラマンスペクトルの系統的比較及びラマン強度に関するsimple stretching modelの両者から振動の帰属を行い, その結果を基に次のような構造モデルを提案した.KO1/2, RbO1/2, CsO1/23系のガラスでは, 25mol%付近までアルカリ成分はGeの5, 6配位化に費やされ, 非架橋酸素は生じない. したがって, この組成域でx/(1-x)>N6(5)>x/2(1-x)(N6(5): 5, 6配位Geの割合, x: MO1/2モル分率) が成立する. 20mol%付近から6配位のGeがGe4O16群を形成し, G…
Experiments have been performed to investigate the effect of cooled plate characteristic on the frost formation under the condition of forced convection. Two kinds of plates which have the different contact angles for water were utilized. Special attention was focussed on the incipient phenomena of the effect of the p…
Etude experimentale du champ de temperature d'un faisceau de 37 aiguilles chauffees electriquement refroidies par une circulation forcee ou naturelle de sodium liquide. Comparaison des resultats obtenus avec les valeurs calculees a l'aide du programme COBRA-IV-I
Abstract The heat capacity of a narrow molecular weight distribution polystyrene, National Bureau of Standards—Standard Reference Material 1478, has been determined by a fully automated adiabatic calorimeter from 5 to 380 K for the sample subjected to different thermal history. The number‐average molecular weight of t…
The structure of molten B2O3 at ca. 650 °C has been investigated by the X-ray radial distribution method. The most likely two-dimensional quasi-crystalline model for the short-range arrangement is a mixed structure of boroxol rings and independent BO3 triangles. The estimated density for this model with an average int…
Abstract Intermediate phases and reactions occurring on decomposing diammonium hydrogen phosphate, ammonium para molybdate, sodium tungstate dihydrate and ammonium meta vanadate were established by thermal analysis and X‐ray examination. These salts promote fabric degradation at low temperatures but are effective at h…
A method is described for synthesizing sodium polysulfides of stoichiometries Na2S3, Na2S4, and Na2S5 by the direct reaction of sodium and sulfur. The reaction is carried out in the furnace well of an inert−atmosphere glove box and features the slow addition of sulfur to molten sodium at temperatures ranging from 100–…
The thermodynamics of hydrolysis reactions show that hydroxyle groups are not stable in glass melt at high temperature. A refining stage carded out at 1000°C for 1 h results in low-OH-content bulk glasses. Preforms were prepared by this method and drawn into fibers. The maximum absorption of 2.9 μm was 110 dB/km and a…
Molybdenum trioxide dissolves in dimethyl sulphoxide (dmso) to give a solution from which the polymeric complex [{MoO3(dmso)1.33}n](1a) may be crystallised. It also reacts with pyridine N-oxide (pyo), triphenylarsine oxide, and pyridine (py) to give insoluble polymeric complexes [{MoO3(pyo)}n](2), [{MoO3(AsPh3O)0.5}n]…
A V-shaped segregation, found in a sulfur print of longitudinal strand section, has been macroscopically investigated. A simple model, using polyethylene particles of 2mm diameter, has been prepared to simulate formation of the V-shaped segregation.The results obtained are summarized as follows:(1) The V-shaped segreg…
A γc alumina carrier is shown to be partly hydrated to bayerite or gibbsite in contact with an ammonia solution, or even water, at room temperature, and to boehmite when heated at 410K and a pressure of 0.3 MPa in water.