Materials Literature
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Abstract The dielectric constant ϵ′ and dielectric loss ϵ″ have been investigated for SBR samples vulcanized with TMTD and loaded with silica in increasing quantities in the frequency range from 60 Hz to 10 8 Hz at room temperature. Also, the physico‐mechanical properties of these samples have been investigated. The r…
Abstract A full field feature specific image analysis system has been developed for direct morphological characterization of carbon black in the electron microscope. The system provides quantitative size and non-dimensional shape information, as well as qualitative classification into specific shape categories using p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-temperature kinetics of pyrolytic graphite gasification by fluorine atoms and moleculesDaniel E. Rosner and Joseph P. StrakeyCite this: J. Phys. Chem. 1973, 77, 5, 690–699Publication Date (Print):March 1, 1973Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal degradation of naturally occurring materials. II. Products from the pyrolysis of triglycerides at 400.deg.Elizabeth Barr Higman, Irwin Schmeltz, Howard C. Higman, and Orestes T. ChortykCite this: J. Agric. Food Chem. 1973, 21, 2, 202–204Publication Date (Print):March…
It is well established that open-end yarns are different from ring yarns; in particular OE yarns are weaker and more bulky in spite of the higher twist levels used. The introduction of these yarns into woven fabric affects the structure and the characteristics of the fabrics. The fabric structure traps non-load bearin…
Some non-metallic crystals can have heat conductivities comparable with the best metals, while other non-metals are better heat insulators than most metallic alloys, and materials at both extremes have practical uses. The temperatures at which the conductivities of pure crystals are a maximum vary widely, and for any…
The present theories for in-vacuum gap conductance, hs, are compared to existing out-of-pile data. It is concluded that the Mikic theory which has not been previously applied to nuclear applications is most suitable for future development. The additional data necessary to estimate the transition pressure and to confir…
The metal-to-insulator transition in V2O3 is described by a model that is based on the electronic band structure of this material. The vanadium 3d-t 2g band decomposes in the trigonal symmetry into two bands, a 1g and e π. The a 1g band consists of orbitals connecting pairs of c-axis neighbouring atoms, while the e π…
Summary The residua system of chemical weathering is here defined as the chemical sink towards which the bulk of earth's surface materials (i.e. the silicate rocks) trend during weathering. Chemically the system is defined in terms of four major components, SiO 2 –Al 2 O 3 –Fe 2 O 3 –H 2 O, evidence being derived from…
Values for splittings of 3d, 4d and 5d bands in some metals in the range Z=29-93 have been derived from photoelectron energy distributions. Comparisons with free atom experimental and theoretical values are made and evidence for crystal field effects on the splittings presented.
Hydrogen environment embrittlement refers to metals stressed while exposed to a hydrogen atmosphere. Tested in air, even after exposure to hydrogen under pressure, this effect is not observed on similar specimens. Much high purity hydrogen is prepared by evaporation of liquid hydrogen, and thus has low levels for pote…
Abstract The causes of some of the differences in properties between compounded natural rubber and compounded synthetic poly (isoprene) have been traced to the insoluble non-rubber material in natural rubber. This material is mostly denatured proteins and is responsible for the higher modulus, faster scorch time, high…
The corrosion of mild steel in cultures of sulphate-reducing bacteria has been studied and in particular the effect on the corrosion rate of changing from an iron-rich to a minimal-iron growth medium in semi-continuous cultures. The results indicate that the ferrous sulphide produced by the bacteria is the major corro…
Abstract Measurements of the effect of hydrostatic pressure on the first order Raman frequencies of Se and Te are reported. All the frequencies of the Raman active modes decrease with pressure. The valence force field model proposed by Nakayama and Odajima is used to explain this behaviour.
It is shown that the often cited inverse-logarithmic oxidation law, X−1 ∝ −logt, where X is the oxide thickness and t the observation time, is not an asymptotic solution of the rate equation derived by Mott and Cabrera in their theory of low temperature oxidation. Thus whether or not the inverse-logarithmic law is exp…
The nonlinear viscoelastic functions G1′, G1″, G3′, and G3″ were evaluated for disperse systems of polystyrene solution and styrene-divinyl benzene copolymer particles at various temperatures ranging from 10 to 70°C over the frequency range from 12 to 1/256 Hz. In general, frequency dependence curves of all the functi…
Intrinsic coercive force measurements were made on BaFe 12 O 19 in which certain amounts of Fe were substituted by In, Cr, Al, Ga, ZnGe, ZnV, ZnNb or ZnTa. The specimens were prepared by the ordinary powder metallurgy method. X-ray diffraction of the specimens indicated only the presence of the magnetoplumbite phase w…
EVALUATION of the many factors associated with the transfer of heat caused by the evapo[ation of body sweat has been a subject of major interest over the past three decades, Skin wettedness (Ref 7) was early observed as a significant factor associated with the sense C'pleasantness'' and more recently with t'comfort''…
A tight-binding model is presented to study the density-of-states and some other electronic properties of a liquid metal and an amorphous solid composed of atoms with one-atomic orbital per site. A one-electron Green function is expanded in terms of atomic orbitals and described by a perturbation expansion series in p…
The effect of benzotriazole on the corrosion of copper in 3% NaCl at pH3 has been studied by immersion tests, potentiostatic polarization, a.c. impedance measurements and ellipsometric investigations. Results show that a thin layer of BTA forms in neutral solutions but that, in acidic solutions, the film is covered wi…