Effect of Cracks on Thermal Conductivity
Expressions are derived for the effect of penny-shaped cracks of various orientations on the thermal conductivity of solid materials.
Materials Literature
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Crystal structures of sodium sulfate decahydrate (Glauber's salt) and sodium tetraborate decahydrate (borax). Redetermination by neutron diffraction
Single-crystal neutron-diffraction data with full-matrix least-squares refinements have yielded precise locations for all atoms (for the H atoms in particular), in both compounds. Hydrogen bonding with H atom sites disordered with equal occupancy, as previously postulated to be the source of zero-point entropy in the…
An improved method for calculating the contribution of solvent to the X-ray diffraction pattern of biological molecules
Solvent makes a significant contribution to the diffracted intensity of crystals and fibres of large biological molecules. Allowance for this contribution must be made in the refinement of trial structures and an improved method is described for the calculation of solvent scattering.
Mehrstufige organische Redoxysteme — ein allgemeines Strukturprinzip
Ein allgemeines Strukturprinzip für organische Verbindungen, die zur zweistufigen Elektronenübertragung befähigt sind, geht aus der folgenden Reaktionssequenz hervor: Dabei können ein oder beide X durch Y⊖ ersetzt sein. In diesen Systemen besitzt der radikalische Partner oft sehr große thermodynamische Stabilität. Wah…
Pore Sizes of Solids
Abstract A new, fast, and simple method based on size exclusion chromatography permits determination of the volumes of open and closed pores of rigid solids such as silica or porous glasses, together with the specific surface and the pore‐size distribution for pore diameters ranging from 10 to 4000Å. The results are i…
Electronic structure and redox properties of the clusters [Ru3O(CH3CO2)6L3]n+
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure and redox properties of the clusters [Ru3O(CH3CO2)6L3]n+John A. Baumann, Dennis J. Salmon, Stephen T. Wilson, Thomas J. Meyer, and William E. HatfieldCite this: Inorg. Chem. 1978, 17, 12, 3342–3350Publication Date (Print):December 1, 1978Publication Hist…
Low-frequency dispersion in carrier-dominated dielectri
Some dielectric materials with large densities of low-mobility charge carriers show an anomalous low-frequency dispersion of the real and imaginary components of the complex dielectric permittivity, both varying as ω n−1 , with n close to or equal to zero. This behaviour is likely to be found in any dielectric materia…
Utilización de cenizas volantes en la fabricación de cementos
La crisis de la energía, que tomó gran importancia a partir de 1973, ha originado la aceleración de estudios y posibilitado el desarrollo de otras fuentes alternativas del petróleo. El aprovechamiento de la energía latente que tienen algunos materiales volcánicos, o subproductos de procesos industriales (escorias side…
Estudio, mediante microscopía, del proceso de microfisuración de un hormigón sometido a compresiones previas
Para apreciar la acción física de microfisuración que experimentan los hormigones, cuando se encuentran sometidos a esfuerzos de compresión, se emplean en la actualidad diversas técnicas, siendo las más utilizadas la prospección radiográfica, los métodos fotoelásticos, y la observación mediante microscopía.
Valores del potencial de corrosión y de a resistencia de polarización de armaduras galvanizadas embebidas en hormigón
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Bibliografía
Normalización del cemento. Características químicas: Algunos comentarios sobre los métodos de ensayo
El Pliego de Prescripciones Técnicas Generales para la Recepción de Cementos (RC-75), Decreto 1.064/1975 de 23 de mayo de 1975, publicado en los B.O.E. núms. 206 y 207, de fechas 28 y 29 de agosto, respectivamente, del mismo año, incluye la clasificación de los cementos, las prescripciones relativas a las característi…
Charge neutralisation of insulating surfaces in the SEM by gas ionisation
A theory is presented in which the elimination of charging artefacts on uncoated insulating surfaces in the scanning electron microscope by a low-pressure ambient gas is taken to be due to ionisation of the gas. Curves of ion current against ionising field calculated from a model of gas neutralisation give good agreem…
Propagation of partially polarized light through anisotropic media with or without depolarization: A differential 4 × 4 matrix calculus
We extend the scope of the Mueller calculus to parallel that established by Jones for his calculus. We find that the Stokes vector S of a light beam that propagates through a linear depolarizing anisotropic medium obeys the first-order linear differential equation dS/dz = mS, where z is the distance traveled along the…
Conducting polymers: Halogen doped polyacetylene
A study of the electrical conductivity of the halogen doped transpolyacetylene system, (CH)x, is reported. When films of trans- (CH)x are exposed to chlorine, bromine, or iodine vapor, uptake of halogen occurs; and the conductivity increases markedly, over eleven orders of magnitude in the case of iodine. The behavior…
Raman spectrum of anatase, TiO2
Abstract Raman spectra of anatase have been observed in natural and synthetic crystals. Both crystals show the same spectral features. The Raman band occurring at 516 cm −1 at room temperature is split into two peaks centred at 519 cm −1 and 513 cm −1 at low temperature (73 K). The six Raman active fundamentals predic…
Elements of X-ray Diffraction
B D Cullity London: Addison-Wesley 1978 pp xii + 555 price £16.50 This is the second edition of a book concerned with the theory and application of x-ray diffraction to polycrystalline materials in particular. The first edition is an established text for many metallurgists, physicists and chemists interested in orient…
Heat of transport in solids. III. Computer simulation of vacancy in an FCC crystal
For pt.II see ibid., vol.10, p.3051 (1977). Uses computer simulation to study the evolution of the time-dependent energy current J(t) for a vacancy in a model FCC system. In view of the problems arising in the thermal-equilibrium calculation of J(t), the simulation is performed at zero temperature, using the augments…
Electronic band structure and bonding in transition metal layered dichalcogenides by atomic orbital methods
It is shown that the main features of the electronic structure of transition metal layered dichalcogenides can be calculated in a simple ab initio atomic orbital framework. Examples from Groups IV, V and VI of the transition series are considered.
An X-ray photoelectron spectroscopic study of the interaction of oxygen and nitric oxide with aluminium
Abstract The interaction of oxygen and nitric oxide with clean aluminium surfaces has been investigated by X-ray photoelectron spectroscopy. Studies have been in the main confined to the temperature range 80–290 K and pressure range 10-6–10-2 Pa. The Al(2p) level is shown to exhibit a shifted component at a binding en…