Materials Literature
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The literature of the past two decades suggests that confusion persists concerning the role of director fluctuations in the theory of nematics. Are these fluctuations necessarily small? If so, the fluctuation spectrum must terminate at a wavevector q c which is of the order of 109 m−1, yet fluctuation modes with wavev…
The i. r. spectra of benzimidazol-2-thione have been measured from 4000 to 180 cm−1; polarized spectra of single crystals have been also obtained. The Raman spectra of polycrystalline samples and solutions have been recorded and the polarization of many lines has been determined. Most vibrations have been assigned on…
High specific thermal conductivity (thermal conductivity divided by density) is a major design criterion for minimizing system mass for space power systems. For nuclear source power systems, graphite fiber reinforced copper matrix (Gr/Cu) composites offer good potential as a radiator fin material operating at service…
This report will present the results of a study on the effects of stress volume on the tensile strength of two nuclear-grade graphites. The materials selected were H-451, an extruded near-isotropic graphite manufactured by Great Lakes Carbon Corporation, and IG-110, a fine-grained isotropic molded graphite manufacture…
Article Crystal structure of hexapotassium di-μ-selenido-bis(diselenidogallate), K6Ga2Se6 was published on January 1, 1991 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 197, issue 1-2).
Effects of various kinds of rare earth oxides (Y2O3, Er2O3, Sm2O3, La2O3 and CeO2) addition on the sintering of mullite and the precipitation behavior of secondary phases in the mullite sintered bodies were investigated. The sintering of the mullite compacts, to which a small amount of these rare earth oxides was adde…
An investigation was made to determine the relevance of impacter shape to nonvisible damage and tensile residual strength of graphite/epoxy cases for the solid rocket motors of the Space Shuttle. Impacters were dropped onto 30.5-cm (12-in.)-long rings (short cylinders) that were 76.2 cm (30 in.) in diameter and 36 mm…
The local structure of interlayer lanthanide ions ion-exchanged into vermiculite clay has been determined as a function of the nature of the lanthanide ion and of the physical form of the sample (powders and oriented films) using X-ray absorption spectroscopy. Water molecules form the first coordination shell, with me…
Gadolinium(III) complexes of citric (3-carboxy-3-hydroxypentane-1,5-dioic) and 3-carboxypentane-1,5-dioic acid have been studied potentiometrically at 25°C and an ionic strength of 0.15 mol dm–3 NaCl. Both [GdL](H3L = citric acid) and [GdL(OH)]– were detected. From potentiometric and spectroscopic evidence citrate is…
In pharmaceutical studies it is often necessary to dissolve a slightly polar drug in a mixture of water and one or more cosolvents, such as ethanol, glycerol, and propylene glycol, to increase the drug's solubility. It is also of interest to know whether a maximum in the solubility profile of the drug exists in the mi…
The texture change due to a change of cold rolling direction and annealing temperature in the production of 0.6% Si steel sheet is described. Cross rolling results in a very strong (001)<110> component, causing soft magnetic properties in a direction at 45 degrees of the rolling direction. The texture governing…
The fact that polyimide foams of low density and very high T g have excellent sound absorbing properties demonstrates that other factors, most notably foam morphology, have significant effects on the sound absorbing behavior of foams. It was also found that there is not always a direct relationship between mechanical…
Amorphous iron-base alloys typically contain large amounts of metalloids (B, P, C). The role of the metalloids is to facilitate the glass-formation but they very strongly influence the corrosion behaviour, too. Addition of phosphorus to iron-chromium alloys modifies the passivation mechanism and leads to self-passivat…
This paper reports on theoretical equations describing the flow of pulp in refiners were used to analyze the experimental results obtained in a series of pilot plant trials. Western red cedar and loblolly pine wood chips were refined in 1-3 stages at rotational speeds of 1200 and 1800 rpm to produce thermomechanical p…
Single-phase, nonlinear transformers with anisotropic iron cores are modeled for nonsinusoidal (consisting of fundamental and low-order harmonics) terminal conditions based on design data through a quasi three-dimensional magnetic field analysis. This analysis includes the effects of the interlamination and butt-to-bu…
Improved crystal structure parameters are reported for α‐boron. Plots showing comparison of theoretical and experimental valence charge densities for two crystalline planes are given. Comparisons of the strengths of various inter‐ and intraicosahedral bonds are reported in terms of the maximum charge density associate…
A new measurement system using a silicon photo-diode was developed to investigate the precise thermal history during the initial solidification of stainless steel. From the measured cooling curve, it was confirmed there existed large undercooling before nucleation. Maximum undercooling obtained was 260 K. The undercoo…
Different ratios of type V and I collagens were submitted to mixed fibrillogenesis followed by localization of type V collagen within the aggregates by immunoelectron microscopy. At lower concentrations (10-30%), type V collagen segregates into aperiodic filamentous material, peripheral to the cross-banded type I fibr…
Skipjack Euthynnus pelamis is one of the species of warm-blooded fishes and its true dark muscle is often 10°C warmer than the surrounding water. In this study, we have isolated soluble Type I collagens from the true dark muscle, ordinary muscle, and skin of skipjack in order to make a comparison on their thermal stab…
Article Crystal structure of hexapotassium di-μ-tellurido-bis(ditelluridogallate), K6Ga2Te6 was published on January 1, 1991 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 197, issue 1-2).