Materials Literature
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Abstract Polymers under discussion can be represented by [CH 2 ) n R] p where R is CH 2 , CF 2 , O, S or CH = CH; and where n can vary from 0 to ∞. The copolymer, P(ethylene‐alt‐TFE) is also included. These polymers tend to be highly crystalline with resultant confusion about their Tg and hence their Tg/Tm values and…
Abstract An outstanding achievement of organopolymer chemistry during the past two decades has been the successful development of high‐temperature‐resistant heteroaromatic polymers. The present account makes use of the data available on the synthesis, properties and applications of a relatively small yet typical group…
Changes of density which occur naturally in phase change problems introduce movement of bulk material. It is customary in analyzing such problems to ignore this unpleasant complication and consider the densities to be equal. But for one-dimensional problems the complexities introduced by this bulk movement can easily…
A bstract Source strength of an airgun array may be increased by: utilizing higher pressure, increasing total array volume, employing more guns, improving gun efficiency. One measure of gun efficiency is “specific source strength”, P a *, defined as source strength per unit quantity of air used. Typical units are MPa…
Résumé Des lizardites substituées (Mg,Fe,Ni) 3 Si 2 O 5 (OH) 4 ont été étudiées par spectrométrie en réflectance diffuse de 340 à 2500 nm, de manière à déterminer l'environnement de Mg 2+ , Ni 2+ et Fe 2+ , en particulier la symétrie des sites et les distances métal-ligands. L'examen de la structure de la lizardite se…
Abstract Low temperature Guinier photographs of Na 3 NO 3 ( + 20° → - 140 °C) indicate two phase transitions to M-Na 3 NO 3 and T-Na 3 NO 3 at - 53±3°C and - 122±3°C, respectively. During the phase transitions the main structural features (NO 2 -[ONa 3 ]: antiperovskite type of structure) remain unchanged. The dynamic…
The design of stainless steel-clad LWR fuel and its performance at steady-state, transient, and accident conditions were reviewed. The objective was to evaluate the potential benefits and disadvantages of substituting stainless steel-clad fuel for the currently used Zircaloy-clad fuel. For a large, modern PWR, the tec…
We report the 10B→11B isotope shifts of the Raman spectra of vitreous B2O3, and interpret the unshifted lines (450 and 808 cm-1) in terms of extended and localized modes (respectively) of a network of boroxol rings.
Abstract.- Ion dynamics computer simulations of the migration of cation and anions in "computer glasses " and liquids of silicate and fluoride types are reported, and examples of the diagnostic power of the simulation method are given. The existence of high pressure minima in the viscosity of molten…
The corrosion of glass was studied using SIMS. The leaching of sodium ions bonded to non-bridqing oxygen atoms is governed by the diffusion of H2O. The sodium ions bonded to AlO4-groups undergo an ion exchange with H3O+ .
Mg(BH 4 ) 2 • 3 THF was prepared from MgHo and B 2 H 6 in tetrahydrofuran. It crystallizes monoclinically, space group C2/c, Z = 4. The crystal structure reveals that the molecule contains a seven-coordinate Mg center. Its BH 4 groups form double hydrogen bridges to magnesium. The geometry at Mg corresponds to a sligh…
Abstract The Raman spectra of KHSO 4 single crystals in different geometries have been investigated in the 10–4000 cm −1 range at 300 K, 150 K and 120 K. The infrared spectra of polycrystalline KHSO 4 have also been measured. An interpretation of these results consistent with the crystal structure and other informatio…
Abstract The nature of organo-phosphate and carboxylate bonding in aqueous suspensions of noncrystalline alumina, boehmite, and gibbsite has been studied using the anionic nitroxide spin probes 3-carboxy-2,2,5,5-tetramethyl-1-pyrrolidinyloxyl and 4-hydroxy-2,2,6,6-tetramethyl-piperidinooxyl dihydrogen phosphate. Analy…
"Modern Crystallography II. Structure of Crystals." Optica Acta: International Journal of Optics, 29(12), p. 1586
Summary Chemical and mineralogical properties of ochreous brown earths have been studied with particular reference to: (1) the distribution within the profiles of Fe and Al compounds; (2) the occurrence of smectite‐like clay minerals in surface horizons. Ochreous brown earths studied belong to a developmental sequence…
In view of the importance of the ice rule imposed on the proton configurations in hydrogen bonded crystals, a cluster approximation is developed and applied to the phase transition in squaric acid. A particular emphasis is laid on the fact that in squaric acid the strong coupling between the lattice distortion and pro…
The intergranular fracture in Cu-based shape memory alloys is most hazardous for the application of these alloys. In order to clarify the cause of the fracture, the fracture behavior of several Cu-Al-Ni bicrystals with different orientation relationships have been examined by tensile tests. From these results, it has…
Abstract Curing of carboxylated nitrile rubber (XNBR) with epoxy resin in presence of different fillers has been studied. It was observed that 7.5 phr of resin give a compromise combination of properties in FEF black (N 550)‐filled vulcanizates at 40 phr loading. Further studies at different loadings of black, reinfor…
The electric insulators for superconducting magnet coils to be used in a large fusion reactor are subjected to large compressive and tensile stresses to a maximum level of about 400 MPa, and these stresses should pose a significant electrical insulating problem in practice. In this paper, dc and ac dielectric breakdow…
The change in the morphology of lath martensite with deformation of austenite (ausforming) has been studied by using an 18 % Ni maraging steel. Specimens in austenitic state were deformed in tension by several strains (true strain ε = 0.1 ∼ 1.0) at 773 K (which was above Md temperature). In the case of conventionally…