Materials Literature
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Calcareous nannofossils from Man Aike Formation are described and illustrated from SEC-7 well, located near Cardiel Lake, Santa Cruz Province, Argentina. The nannoflora contains Neococcolithes dubius, Zigrhablithus bijugatus, Reticulofenestra umbilica, R. dictyoda, Braarudosphaera bigelowi, Transversopontis pulcher, T…
We systematize available thermodynamic information on transition metal diborides, with emphasis on the enthalpy of formation, the vibrational entropy and the melting temperature. When experimental information is lacking, e.g., for metastable compounds, we obtain estimates through interpolation and extrapolation proced…
Thermal conductivities of dense pure hematite, magnetite, wustite and iron have been measured by the laser flash method in the temperature range from room temperature to 1 553 K. The relatively high thermal conductivities of dense pure hematite, magnetite and wustite at low temperature were found and these values decr…
The addition of titanium to standard 625 grade enhances the age-hardening response, enabling yield strengths greater than 800 MPa to be obtained by simple, industrially compatible, heat treatments. The effect of such treatments on microstructure have been studied, together with their influence on the strength/toughnes…
Effects of neutron irradiation and iodine as a corrosive fission product on the fatigue behavior of Zircaloy-2 fuel cladding tubes were investigated using two different types of test specimens in order to evaluate the fatigue strength of BWR fuel subjected to such variable loading conditions as load following or autom…
A factorial-analysis technique is applied to study the effects of strand spacing, twist, and spindle speed on the hairiness of double-rove yarn. A wide range of twist levels and spindle speeds is covered by spinning yarns from two different types of fibres, namely, cotton and a polyester-fibre/cotton blend, in order t…
2014 La matrice de carbure de silicium des composites SiC/SiC a t examine d'un point de vue chimique et structural par spectroscopie de pertes d'nergie d'lectrons (EELS) et par microsco- pie lectronique haute rsolution (MEHR). La croissance colonnaire des cristaux de la matrice et leur distribution radiale par rapport…
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…