Materials Literature
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Thick target x-ray photoelectric yield formulas are derived assuming a simple range for photoelectrons in the target. The predictions are compared with available experimental results for Cu Kα x rays impinging on Al, Cr, and Sn targets at an angle of 70°. Agreement is within a factor of 2 for Al and within 10% for Cr…
The dissolution kinetics of iron filamentary single crystals in dilute acidic environments were shown to obey the topographical theorems proposed by Frank to describe etch-rate anisotropy. Successive dissolution profiles of iron whiskers were observed in situ. by using time-lapse motion picture photomicroscopy. Reluct…
This paper gives an analytical investigation of the hydromagnetic theory for squeeze films between two conducting surfaces. It is shown that increase in load capacity, pressure, and time of approach are possible by increasing either the strength of the magnetic field, or conductivities of the surfaces, or both.
Methyl 6-deoxy-6-nitro-D-glucopyranoside and methyl 6-deoxy-6-nitro-L-idopyranoside under mild alkaline conditions undergo fission of the pyranoside ring followed by loss of the aglycon and cyclization of the resulting nitro sugars to a mixture of scyllo and myo-1 deoxynitroinositols. A mechanism for the alkaline glyc…
The energy required to form one hole-electron pair in gallium phosphide has been measured to be 7.8±0.8 eV/pair. The experimental method consisted of determining the charge produced and collected when α particles of known energy bombarded a surface barrier which had been formed by evaporating a thin layer of gold onto…
The electrical conductivity of both single‐crystal and sintered near‐stoichiometric rutile was investigated over the range 600° to 1400°C and the oxygen pressure range 0.005 to 1.0 atm. Above 1200°C, the conductivity of single‐crystal and sintered rutile obeys the relation σ∼ P o 2 −1/4 . This can be explained on the…
Abstract Basal spacing data for neutral amine complexes with montmorillonite and vermiculite are explained on the basis of two layers of fully extended amine molecules inclined at about 65° to (001) with the NH 2 groups closely associated with pairs of silicate oxygen atoms. The molecular orientation is shown to be fa…
A unified treatment of phonon bottleneck theory is given, using a thermodynamic method which includes both the direct and Orbach processes. The key parameter is the phonon relaxation time, which is calculated in a variety of cases, including several in which it is determined by magnetic impurities. The theory is exten…
Measurements have been made of the heat-transfer rate to the stagnation point of catalytic spheres and cylinders placed in the slow flow of dissociated oxygen produced in a glow-discharge tube. The use of a rapid-response thin-film heat-transfer gauge permitted operation in a transient mode; that is, a step function o…
Collapse of a spherical bubble in a compressible liquid, including the effects of surface tension, viscosity, and an adiabatic compression of gas within the bubble is investigated by numerical solutions of the hydrodynamic equations. A limiting value of shear viscosity causes the bubble collapse to slow down markedly,…
Stress‐strain curves for five types of polycrystalline MgO are presented as a function of temperature. All types were nominally dense and pure but differed in grain size, composition, and porosity. Above 1200°C deformation occurred by grain boundary shearing accompanied in some cases by slip; below 800°C, specimens fr…
A freshwater diatom flora has been shown to exist on sand grains. The species have been determined from samples of four bodies of water. This epipsammic flora is composed of minute diatoms, many of which require electron microscope study before their identification can be made certain. The chemistry of the water undou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome Reactions of the Octahalodirhenium(III) Ions. Reactions with PhosphinesF. A. Cotton, N. F. Curtis, and W. R. RobinsonCite this: Inorg. Chem. 1965, 4, 12, 1696–1700Publication Date (Print):December 1, 1965Publication History Published online1 May 2002Published inissue 1…
Abstract Star‐type polystyrenes, polymers with p branches attached to a common multifunctional center, and comb‐type polystyrenes, polymers with an average of p branches attached at random to a polymeric backbone, have been prepared by the reactions, respectively, of polystyryllithium of narrow chain length distributi…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
The structure of rapidly rotating polytropes is investigated using an approximation technique of integrating outwards from the centre and inwards from the surface, matching the two solutions at an interface. Results are presented for values of the polytropic index n = 1, 1.5, 2, 2.5, 3, 3.5, 4. The method used is an e…
Auszug Die Untersuchung bezweckte, die gemeinsamen Struktureigenschaften aller Boride und Bor-Modifikationen, die B 12 -Atomgruppen aufweisen, festzustellen. Es zeigte sich, daß die Gitterkonstanten aller dieser Strukturen aus einfachen Anordnungen der B 12 -Gruppen, die als große Metallatome angesehen werden können,…
Abstract The industrial applications of Fullers' Earth are discussed including those of the clay in its natural form, calcium montmorillonite, and after modification by acid activation or sodium exchange. Special consideration is given to uses in oil refining, foundry bonding, civil engineering, and agriculture.
Hiroshi Kato, Kaichiro Yamaguchi, Teijiro Yonezawa, Kenichi Fukui; The Electronic Structure of Some Hydrides, Halides and Alkyl Compounds of Boron and Alum
The mechanical properties of four different polyimide samples are measured. H-film, poly(N,N'-( p,p'-oxydiphenylene)pyromellitimide), shows no softening phenomena below 500°C. The three other polyimides exhibit a definite softening at elevated temperatures. All of the samples investigated show evidence of chemical rea…