Materials Literature
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Renewed interest in metallic fuels for liquid-metal fast breeder reactors (LMFBRs) has arisen for several reasons: The excellent performance demonstrated by metallic fuel, particularly at Experimental Breeder Reactor II; the demonstrated transient capability; the inherent compatibility with the sodium coolant; and the…
Thermal transport properties of a series of polyester, cotton, and polyester/cotton blend fabrics were determined in an effort to understand physical basis of clothing comfort. The results indicate that both the fabric construction and the constituent fiber properties affect thermal transport. In general, thermal insu…
Abstract The electrical resistivity of crosslinked high‐density polyethylene loaded with conductive blacks and carbon fibers was studied as a function of filler concentration and temperature. A thermoelectric switching phenomenon (a sudden resistivity increase in the vicinity of the polyethylene melting point) in such…
Elastic constants of single crystals of yttria‐stabilized zirconia were determined through the temperature range 20° to 700°C. Crystals containing 8.1, 11.1,12.1, 15.5, and 17.9 mol% Y 2 0 3 were measured. The elastic constant C 11 was found to decrease and C 12 and C 44 to increase with increasing Y 2 O 3 content; th…
Abstract Crystallization of polypropylene (PP) in the blends of PP with styrene–ethylene butylene–styrene triblock copolymer (SEBS) is studied through differential thermal analysis (DTA) and X‐ray diffraction measurements. Analysis of crystallization exotherm peaks in terms of crystallization nucleation and growth rat…
A density functional model, based on the coarse grained density distribution is used to analyse the melting of hard spheres and discs. The role of the attractive interaction is modelled in a mean field approximation, to get the full solid-liquid-vapour phase diagram of a system with Lennard-Jones interactions.
Dielectric properties are reported for lead magnesium niobate (PbMg 1/3 Nb 2/3 /O 3 ) ceramics which were prepared as single phase (i.e., without pyrochlore) with an improved technique. Dielectric constants of 18000 for pure PMN and 31000 for PMN with 10% PbTiO 3 were achieved; these values are 50% larger than those r…
Abstract Electrochemical cells with polyacetylene, (CH) x , as active anode and cathode material have been built. The cells were of the type (CH) x /R 4 N + ClO 4 ⊖ /(CH) x . The cells with different electrode thicknesses and areas, respectively, showed all the same typical charging and discharging behaviour. From the…
We report a new photoelectrochromic system for information storage and display applications. This system is based on the electrochromic properties of thin films of electrochemically generated conducting polymers. These materials can be switched between two states of optical absorption: a highly absorbing, almost‐black…
Summary (1) Catch connective tissue is defined as the collagenous connective tissue whose mechanical properties can be changed rapidly (in seconds or minutes) under nervous control. (2) Catch connective tissues are found in all five classes of Echinodermata. They function in tone control of the tissues and in autotomy…
Magnetically induced birefringence is used to monitor the thermally induced self-assembly of collagen fibrils from a solution of molecules. The magnetic torque alone can, at best, only orient the fibrils into planes normal to the field direction. Nevertheless, the gels formed have a high degree of uniaxial alignment,…
The effects of 34 different additives on the growth rate of calcite were investigated. An initial growth rate of about one crystal monolayer (3 × 10-8 cm) per minute was adjusted at a constant supersaturation which was maintained by a control circuit. Then the impurity was added step by step and the reduction of the g…
Recently a computer adapted theory suitable for evaluating the dielectric properties of polar systems has been proposed. It rests on the assumption that the system behaves like a macroscopic dielectric and that the modifications of dipolar interactions do not affect its dielectric constant. In the present paper these…
We present a general discussion of the isoenthalpic–isostress molecular dynamics theories of Andersen and Parrinello–Rahman. The Parrinello–Rahman theory is shown to be applicable to the case of nonlinear elasticity if the reference state of zero strain is taken to be the state under zero stress; this brings the theor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative technique for the determination of the number of unoccupied d-electron states in a platinum catalyst using the L2,3 x-ray absorption edge spectraA. N. Mansour, J. W. Cook Jr., and D. E. SayersCite this: J. Phys. Chem. 1984, 88, 11, 2330–2334Publication Date (Pri…
Highly conductive films of Al-doped ZnO have been prepared by rf magnetron sputtering of a ZnO target with Al 2 O 3 dopant of 1–2 wt% in content added. Films with resistivity as low as 2×10 -4 Ωcm and transmittance above 80% at the wavelength between 400 and 800 nm can be produced on low temperature substrate with a r…
This paper reports experimental studies of the development of bulk optical properties as a function of crystallite size for the inorganic direct gap semiconductor CdS. Small crystallites are synthesized via colloidal chemical techniques, and their optical properties are studied in situ at extreme dilution. The crystal…
Based on a microscopic theory developed recently, a dynamical model of density fluctuations in simple fluids and glasses is proposed and analyzed analytically and numerically. The model exhibits a liquid-glass transition, where the glassy phase is characterized by a zero-frequency pole of the longitudinal and transver…
When the mean-free path length of conduction electrons in a metal is comparable to the thickness of the specimen d, various kinds of size effects appear. To study these effects, under the cleanest conditions, filamentary crystals—whiskers—are used. At low temperatures conditions under which d are easily achieved in wh…
Normal-incidence reflectivity spectra of 1T-VSe 2 have been measured at room and liquid nitrogen temperatures with E perpendicular to c and E//c, and Kramers-Kronig analysis has been carried out for the E perpendicular to c spectra over the energy range 0.6-14 eV. The formation of charge-density waves at 110K is seen…