Materials Literature
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We report a variety of measurements on fluid interface motion through model porous media. The dynamics shares many features with other systems pinned by random fields. Over a range of pressures randomness pins the interface. In this range there are many metastable interface configurations and relaxation is extremely s…
We study the low-temperature properties of glasses in a model consisting of elastic dipoles placed randomly in an elastic continuum. We use Monte Carlo annealing to find glassy minimum-energy states and then determine the density of states for small angular oscillations of the dipoles. The coupling of these modes to t…
A review of ceramic matrix composites is presented as related to their type, use, and fabrication. Ceramic composites have the potential for high fracture toughness, resistance to catastrophic failure, high strength, low density, low thermal expansion, and high temperature capability and oxidation resistance. For cont…
A numerical technique for solving liquid metal MHD problems has been developed as a design tool of fusion reactor blankets. The present code can analyze the effect of field non-uniformity on the velocity profile in a straight circular pipe perpendicular to the magnetic field. Under the very strong field, the perpendic…
A 57 Fe Moessbauer study of the Fe 2 O 3 –WO 3 and Fe 2 O 3 –Cr 2 O 3 –WO 3 systems has been carried out. Single phase materials could be prepared having the composition Fe 2−x WO 6−3x/2 (x = 0.28), the stoichiometric Fe 2 WO 6 always contained detectable amounts of α-Fe 2 O 3 . The iron tungstates are found to be uns…
Time resolved luminescence spectroscopy has been used to study the emissions occurring in CaO and CaO:Mg in the range 20 ns to 100 ms after irradiation with nanosecond duration pulses of electrons of energy between 0.2 and 3.0 MeV. An emission at 375 nm in pure CaO with a threshold energy of 0.29±0.2 MeV is attributed…
Abstract By reaction of Pb(CH 3 COO) 2 · 3H 2 O with Na 2 S 2 C=C(CN) 2 · 3H 2 O in water, α-PbS 2 C=C(CN) 2 is obtained. Hydrothermal conditions give small crystals of the α-and β-phase. The crystal structures of the two phases have been determined. The α-phase is monoclinic with space group P2 1 /n and a = 11.879(5)…
To determine the relationship between applied stress and dislocation density, creep experiments have been carried out on single crystals of natural and synthetic sodium chloride with differential stresses between 2.0 and 20.0 MPa at temperatures in the range 20 to 600° C. Dislocation densities were measured on etched…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal-ammonia reduction of .alpha.-tetralone. Competition between ring reduction, carbonyl reduction, and dimer formationZ. Marcinow and P. W. RabideauCite this: J. Org. Chem. 1988, 53, 9, 2117–2119Publication Date (Print):April 1, 1988Publication History Published online1 M…
The crystal structure relationships between the four thermal polymorphs (IV – 437 K – III – 492 K – II – 564 K – I) of RbNO 3 are discussed. Trigonal IV, a = 10.55(2), c = 7.47(2) Å at 298 K, Z = 9, and space group P3 1 (or its enantiomorph P3 2 ) has Rb atoms arranged on a pseudocubic sublattice defined by [Formula:…
A short-range order dependent electronically self-consistent theory of ordering in ferromagnetic substitutional binary alloys is presented. The alloy internal energy is calculated using the cluster-Bathe-lattice method. The calculations use the results of elemental electronic structure calculations and experimental ma…
A new approach to the problem of the dielectric permittivity and losses observed in some NiZn polycrystalline ferrites which strongly differs from the Debye form is presented. Because the ferrite sample is considered as a disordered structure where the well‐conducting grains of various shape and size are separated by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanisms of .alpha.- and .beta.-eliminations of alkoxysilanes from saturated and unsaturated carbon frameworksSukhamaya. Bain, Sina. Ijadi-Maghsoodi, and Thomas J. BartonCite this: J. Am. Chem. Soc. 1988, 110, 8, 2611–2614Publication Date (Print):April 1, 1988…
The solidification of high-chromium cast iron containing 2.5% C, 0.3% Mn, 15% Cr, 0.7% Mo, 0.5% B and various concentrations of Si is examined. Samples were liquid quenched at different stages of the eutectic solidification process and examined metallographically and by silicon linear scanning. Two growth patterns wer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature dependence of intramolecular disorder in the high-temperature phase of poly(tetrafluoroethylene) (phase I)C. De Rosa, G. Guerra, V. Petraccone, R. Centore, and P. CorradiniCite this: Macromolecules 1988, 21, 4, 1174–1176Publication Date (Print):April 1, 1988Publi…
Abstract Hen egg white lysozyme was adsorbed onto clean borosilicate glass and n‐pentyl silane‐treated glass surfaces. Both modified (reductively methylated) and native lysozyme were studied. Variable angle X‐ray photoelectron spectroscopy (VA‐XPS) suggested differences in the nature of the adsorbed layer depending on…
Summary Silicones have been incorporated in personal care products since the 1950s. Initially used in skin care products, and more recently in hair care applications, silicones are recognized for their lubricating properties and for the characteristic soft smooth feel they impart. With recent advances in silicone tech…
The new 4x4 matrix method described by Lin-Chung and Teitler [P. J. Lin-Chung and S. Teitler, J. Opt. Soc. Am. A 1, 703 (1984)] is used to study the optics of multilayer magnetooptic recording media. It is demonstrated that the method is capable of handling very complicated optical multilayer structures. For a quodril…
Regional transport of 1-aminocyclohexanecarboxylic acid (ACHC), a nonmetabolizable amino acid, across the blood-brain barrier was studied in pentobarbital-anesthetized rats using an in situ brain perfusion technique. The concentration dependence of influx was best described by a model with a saturable and a nonsaturab…
Cellulose fibers are selected as a reinforced filler for thermoplastics due to their superior mechanical properties and lower price compared to the thermoplastics. In the present study chemithermomechanical pulp of hard wood (aspen) fibers having selected aspect ratio (length/diameter) were first encapsulated with pol…