Materials Literature
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The Slater-Koster linear-combination-of-atomic-orbitals (LCAO) interpolation method is applied to fit the results of nonrelativistic augmented-plane-wave (APW) calculations at symmetry points in the Brillouin zone for several metallic transition-metal dioxides with the rutile structure, namely, ${\mathrm{RuO}}_{2}$, $…
The conduction threshold which occurs in resistor networks when a certain fraction has zero conductivity can be treated as a sort of critical point. This critical point is also relevant to mixtures of resistors with finite conductivities a and b, in the limit a<<b. A homogeneous function representation is proposed for…
The thermal diffusivity of polycrystalline BN has been measured from 100 to 800K using a 'flash' technique; published specific heat data have been used to evaluate the thermal conductivity. Over a limited temperature range the results have been confirmed by steady-state measurements. The results have been compared wit…
The thermal conductivity of composites made from epoxy-resin Epikote 828 with metal-powder fillers has been measured from 1.7 to 300K. The metals were Cu, Ag, Au, Al, Sn, Pb, stainless steel and bronze, and in almost all cases the particles were spherical or rounded. At 20K and above the thermal conductivity is indepe…
The classical theory of Brownian motion applies to suspensions which are so dilute that each particle is effectively alone in infinite fluid. We consider here the modifications to the theory that are needed when rigid spherical particles are close enough to interact hydrodynamically. It is first shown that Brownian mo…
Plasmon dispersion and anisotropy in the metallic polymer ${(\mathrm{SN})}_{x}$ were investigated directly by electron-energy-loss spectroscopy. A positive dispersion relation was observed for plasmons propagating along the polymer-chain $b$ axis. As the plasmon wave vector changes from parallel to perpendicular to th…
It has been shown that for the reaction catalyzed by "biodegradative" L-threonine dehydratase from E. coli strains K-12 and 980 in 0.5 M phosphate-carbonate buffer, pH 8.4 and pH 9.5, the plots of initial reaction rate (v) versus the initial substrate concentration ([S]0 are characterized by several inflection points,…
Article Recrystallization Kinetics as Observed in the Photoemission Electronmicroscope / Rekristallisationskinetik im Photoemissions-Elektronenmikroskop beobachtet was published on March 1, 1976 in the journal International Journal of Materials Research (volume 67, issue 3).
Purification was conducted on polyvinyl alcohol (PVA) degrading enzyme produced and secreted into the culture medium by Pseudomonas O–3 strain. The enzyme was found to separate into several fractions by ion-exchange chromatography and gel filtration. Among these fractions, a fraction adsorbed to SP-Sephadex C–50 at pH…
Article Phase Equilibria and Interdiffusion in the Cobalt-Titanium System / Phasengleichgewichte und Diffusion im System Kobalt-Titan was published on March 1, 1976 in the journal International Journal of Materials Research (volume 67, issue 3).
Abstract The effect of N,N‐dialkyl dithiocarbamate substitution on the radiation stability of poly(vinyl chloride) (PVC) film was studied. PVC containing 6.5–15.7 mole‐% N,N‐dimethyl dithiocarbamate (PDM) and PVC containing 8.3–17.5 mole‐% N,N‐diethyl dithiocarbamate (PDE) was irradiated with γ‐rays from a Co‐60 sourc…
Over the last half century various techniques and devices have bean developed to give a visual display of infrared signals and images. In the present article a relatively recent development is described in which conversion from infrared to visible is accomplished in a single luminescent material. Most luminescent soli…
Two experiments involving dosing sheep with 60Co were conducted to determine the effect of plant species on cobalt retention. Two digestibility trials with different levels of dietary cobalt were conducted to attempt to detect the effect of cobalt level upon nutrient digestibility. Experiment 1 was a 2 × 2 factorial d…
The effect of internal strain in the zincblende structure was examined on a GaAs single crystal by X-ray intensity measurements under a uniaxial stress along the [1{\bar 1}0] direction. It was found that the stress changes the structure factor of the weak reflexion (006), giving the value ζ = 0.764 ± 0.009 for the bon…
Abstract A theory of V k centres in simple cubic Cs‐halides in the spirit of Sewell's treatment of the small polaron is presented. The stability of a hole trapped on a single site and that of the V k centre are compared. Expressions for the peak position and width at half maximum of the uv ( 2 Σ → 2 Σ ) absorption ban…
The morphology and physical performance properties of the cotton fiber are reviewed. The objective is to clarify interrelationships between cotton morphology and textile performance properties and to delineate approaches to improve chemically modified cotton fabrics. The review has been restricted primarily to subject…
Abstract Solutions of polystyrene in p ‐xylene were frozen in liquid nitrogen. No changes in molecular weight and distribution were caused by freezing solutions for a series of narrow distribution polystyrenes with molecular weights of near 2 × 10 6 and lower. Likewise a commercial polystyrene of M̄ w = 234,000 showed…
Fluxless vacuum brazing has become a commercially feasible process for the high-volume, low-cost production of aluminum heat exchangers. With an Al–Si–Mg filler metal, excellent joint quality is obtained without requiring the use of a flux. A limited understanding of the wetting and flow characteristics of the filler…
Everhart’s theory on the backscatter of electrons from solids is extended so as to yield the backscatter coefficient as a function of the retarding potential rejecting backscattered electrons having energies below a certain fraction of the energy of the primaries. From this function an analytical expression is obtaine…
Abstract This paper has attempted to review current knowledge on mixing fundamentals from a carbon black standpoint. The mixing parameters discussed include volume fill factor, specific energy of mixing, temperature buildup, and flow characteristics. Together, these parameters define the economics of mixing in terms o…