Relation between physical and chemical processes on semiconductor surfaces
(1973). Relation between physical and chemical processes on semiconductor surfaces. C R C Critical Reviews in Solid State Sciences: Vol. 4, No. 1-4, pp. 515-539.
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Crystallization of amorphous selenium films. I. Morphology and kinetics
We report a study of the morphology and kinetics of crystallization of films of a-Se vapor deposited on mica substrates. Morphological examination was facilitated by the complete dissolution of the amorphous component of the films by CS2, while the crystalline component was left essentially intact. Crystallization beg…
Kinetic Studies of Citrate Synthase from Rat Kidney and Rat Brain
Abstract Crystalline citrate synthase (citrate oxalacetate lyase (coenzyme A-acetylating) EC 4.1.3.7) has been prepared from rat kidney and rat brain. These enzymes are homogeneous as judged by acrylamide gel electrophoresis, and immunologically identical with the rat heart citrate synthase. Steady state kinetic studi…
Structure and properties of reduced LaCoO3
Changes occurring in the chemical state, and the crystallographic and electronic structure of LaCoO3 in a reducing atmosphere were determined. These determinations involved the use of thermogravimetric and calorimetric techniques, x-ray diffraction, and magnetic property measurements. It was shown that the reduction p…
Skew scattering in alloys with cerium impurities
Skew scattering by magnetic impurities in dilute magnetic alloys induces an extraordinary Hall effect which has now been observed in many systems. The author calculates the extraordinary Hall effect induced by cerium impurities for which the conduction electron-impurity interaction is mainly due to resonant scattering…
Physical basis of distortional and dilational plastic flow in glassy polymers
A molecular theory for distortional plasticity is described based on thermally activated production of molecular kink pairs which incrementally align short molecular segments and thereby produce strain. The process of crazing is described as a micromechanical problem of elastic-plastic expansion of initially stable mi…
Crystal and molecular structure of a new hexamolybdate-cyclophosphazene complex
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of a new hexamolybdate-cyclophosphazene complexH. R. Allcock, E. C. Bissell, and E. T. ShawlCite this: Inorg. Chem. 1973, 12, 12, 2963–2968Publication Date (Print):December 1, 1973Publication History Published online1 May 2002Published inissue…
Intrinsic nonstoichiometry in the lead zirconate-lead titanate system determined by Knudsen effusion
The range of the intrinsic nonstoichiometry in lead zirconate-titanate at 1100 °C has been established independently by two gravimetric techniques. A modified Knudsen effusion experiment allowed for an extended interpretation of the vapor pressure data. A single experiment was used to determine the width of any Pb1−x…
Instability of screw dislocation pile-ups
An instability mechanism for a pile-up of perfect screw dislocations is investigated where the cross-slip barrier is that of the Peierls-Nabarro force. The pile-up is found to reach a state of unstable equilibrium under the condition τ* = 0.66(μs)1/2, where τ* is the tip stress of the pile-up, μ the shear modulus, and…
Far Infrared and Raman Spectra of K3[Co(CN)6] and [Co(NH3)6][Co(CN)6]
Abstract Far infrared spectra of K3[Co(CN)6] and [Co(NH3)6][Co(CN)6] and a single crystal Raman spectrum of K3[Co(CN)6] have been measured. Calculations of optically active crystal vibration frequencies have been made, on the basis of the crystal structure determined precisely. For these two types of established cryst…
Structure, properties, and some applications of liquid crystals*
Liquid crystals may be classified in two major categories, namely, thermotropic and lyotropic. Thermotropic liquid crystals are commonly prepared by heating organic compounds, whereas lyotropic liquid crystals are made by mixing two or more components. Thermotropic liquid crystals are mainly of interest in this paper.…
Elastic Analysis of a Skull
A finite-element elastic analysis is made of a skull. Measurements were made of the geometry and thickness of a skull. The skull was then idealized with a doubly curved and arbitrary triangular shell element. Results suggest that the skull is well built for resistance to front loads. The importance of using a composit…
Photographic Investigation of High-Speed Missile Impact upon Nylon Fabric
Single layers of nylon fabric have been subjected to high-speed missile impact at velocities ranging from 116 to 537 m/sec. The transient responses of the fabric and missile have been observed by high-speed photography. The photo graphs have shown that fabric deformation was pyramidal before penetration and more conic…
Binary SiO2–B2O3 glass system: Refractive index behavior and energy gap considerations
A recent investigation of the binary borosilicate glass system has led to the realization of a useful cladding material for pure fused silica core fiber optical waveguides. The feature which makes the borosilicate glass useful is that its index of refraction is sufficiently less than that of pure fused silica to allow…
REPORT ON GIANT NERVE FIBRES IN NANOMIA
The siphonophore Nanomia has a pair of giant fibres running along the stem, the larger of which conducts at velocities up to 3 metres/second. Histologically the two giant fibres appear to be composite, partially syncytial structures representing specializations within the general ectodermal nerve plexus.
Application of Glass-Ceramics for Electronic Components and Circuits
Ceramic materials of interest for electronic components, such as ferroelectrics, ferrites, and transition metal oxides have no natural glass-forming habit. A rapid cooling of their melt is required to obtain homogeneous glasses. This is the most important requirement for controlling crystallization and phase dispersio…
Molecular weight decrease in the early pyrolysis of crystalline and amorphous cellulose
Abstract Samples of ordinary “ash‐free” cellulose papers and similar samples decrystallized by swelling in liquid ammonia were pyrolyzed in vacuo to a weight loss ranging from <0.1% to nearly 20%. The samples were then nitrated and their molecular weight distributions determined by gel permeation chromatography. Wh…
Some basic engineering properties of halloysite and allophane clays in Java, Indonesia
The properties of two soil groups widely found in Java and Sumatra are studied. The two groups, closely related, are known pedologically as latosols and andosols, and are formed under tropical weathering conditions from volcanic parent material. The latosols are reddish in colour and are found at altitudes up to about…
The influence of fine structure on the pyrolysis of cellulose. I. Vacuum pyrolysis
Abstract The effects of crystallinity, orientation and degree of polymerization on the vacuum pyrolysis of cellulose have been investigated. Natural, modified and manmade celluloses were characterized and the kinetics of their pyrolysis at 251°C studied. The high‐temperature pyrolysis of these samples was also investi…
Non-Mendelian Inheritance of DNA-Induced Inositol Independence in Neurospora
Inositol-independent (inos(+)) revertants of Neurospora induced in inositol-requiring mutants by treatment with wild-type DNA in previous studies were found to be stable and to grow well in the absence of inositol. Genetic data presented in this paper show that a major proportion of these induced revertants rarely tra…