Materials Literature
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The single-crystal elastic constants of tetragonal Al2Cu have been measured over the temperature range 4.2–300 K by the pulse-echo-overlap technique. The directly measured constants show a normal monotonic decrease in magnitude with increasing temperature but with C44 showing the least change. The anisotropy ratios C3…
The complex dielectric constants parallel and normal to the optical axis in ice Ih single crystal were measured in a wide range of the temperature (0°∼-150°C). T h e s t a t i c d i e l e c t r i c c o n s t a n t o f t h e D e b y e c o m p o n e n t a t e a c h t e m p e r a t u r e w a s o b t a i n e d b y e x t r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigations of antigorite and nickel supported catalysts by x-ray photoelectron spectroscopyJacques C. Vedrine, Guy Hollinger, and Tran Minh DucCite this: J. Phys. Chem. 1978, 82, 13, 1515–1520Publication Date (Print):June 1, 1978Publication History Published online1 May…
Abstract The glass transition temperature T g of nylon 6 decreases monotonically toward a finite value T gl upon increase of the moisture content. The mechanism of this decrease entails the reversible replacement of intercaternary hydrogen bonds in the accessible regions of the polyamide. The limiting glass transition…
Anodic iron dissolution in acidic chloride solutions (constant ionic strength of 4.5M) over a wide range of H + and Cl − concentrations has been investigated. Anodic dissolution in low [H + ]‐concentrated chloride solutions is accelerated by both Cl − and OH − with Tafel slopes of 0.075 V/decade at low polarization an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of superoxide ion during the decomposition of hydrogen peroxide on supported metal oxidesNobumasa Kitajima, Shunichi Fukuzumi, and Yoshio OnoCite this: J. Phys. Chem. 1978, 82, 13, 1505–1509Publication Date (Print):June 1, 1978Publication History Published online1…
A novel method to obtain boron and phosphorus concentration in silicon crystals by photoluminescent (PL) analysis at liquid-helium temperature is reported. The intensity ratio between intrinsic and extrinsic components in the PL spectra reflects the impurity concentration. The tentative calibration curves for boron an…
Abstract Resistivity and dielectric constant of polyethylene/carbon black compounds were measured from room temperature to 140°C. Within the polyethylene melting region a PTC/NTC (positive followed by negative temperature coefficients) phenomenon is observed, whose intensity depends on the type of carbon black, its co…
1. Considerations of Friction and Wear. 2. Methods of Impact Stress Analysis. 3. Impact Response of Engineering Surfaces. 4. Erosion by Solid Particles: Ductile and Brittle Theories. 5. General Aspects of Solid Particle Erosion. 6. Experimental Background of Percussive Impact Wear. 7. The Zero Impact Wear Model. 8. Me…
A beta bulge is a region between two consecutive beta-type hydrogen bonds which includes two residues (positions 1 and 2) on one strand opposite a single residue (position x) on the other strand. Compared to regular beta structure, a beta bulge puts the usual alternation of side-chain direction out of register on one…
The Young’s modulus E of metallic glasses increases by ∼7% while the density ρ increases by only ∼0.5% upon annealing near the glass transition temperature. ρ and E of an ’’ideal’’ glass are calculated to approach the crystalline values within 0.5 and 10%, respectively. The large decrease in E of ∼30% observed upon vi…
In this paper Onsager's theory of the orientational order in a three-dimensional system of hard rods is reanalyzed as a nonlinear eigenvalue problem. Bifurcation is found and the equation of state is calculated from the orientational distribution function for a nematic phase. We also investigate the corresponding twod…
In this review we have attempted to highlight each of the major areas of interest in liposome-cell interactions: the purely physical chemical, the cell biological, and the medical. Liposomes can be generated in a number of ways and are classified as small unilamellar, large unilamellar, and multilamellar vesicles. Alt…
Las sales y la humedad son los dos factores que condicionan las alteraciones de los materiales de construcción. Los citados materiales, bien de por sí —piedras y ladrillos—, bien una vez endurecidos —morteros y hormigones—, están estructurados por partículas sólidas granulares, separadas por un sistema poroso, que con…
Los materiales conglomerados que se presentan en la naturaleza deben su génesis estructural a la acomodación geométrica de unos y otros componentes. Tras un proceso de "cimentación", este acomodo, según sea la disposición particular, conlleva por parte del material una respuesta resistente frente a las acciones exteri…
A partir de la lectura del artículo original reseñado en la llamada (1), en el Departamento de Materiales de Construcción del I.E.T.c.c, se han comprobado algunos ajustes granuiométricos de áridos obtenidos por otros métodos clásicos con los resultados que se obtienen aplicando el presente método. La buena corresponde…
La determinación de elementos minoritarios en la industria del cemento adquiere cada día mayor importancia, debido a la investigación de los efectos producidos por éstos. En particular es sabido que los cloruros intervienen en varias fases del proceso de fabricación del clínker, llegando a afectar posteriormente a las…
Los ensayos de la resistencia a la compresión de un hormigón, tienen, generalmente, la mayor significación para proyectistas y constructores, por ello estimamos muy interesantes las experiencias que J. D. Pateman publicó en la revista "Concrete" (febrero 1977). Según Pateman la influencia del curado sobre las propieda…
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