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This paper is composed of five sections. Section III analyzes the Butler-type and flat-plate lenses of the accelerating lens system in the scanning electron microscope (SEM) using a field-emission gun. Section IV presents the result of an analysis of some new accelerating lens systems when three anodes are present. Th…
Using the method of temperature-dependent double-time Green's function, an expression is obtained for the dielectric susceptibility of an anharmonic crystal considering second-order terms in the dipole moment expansion and third- and fourth-order anharmonic terms in the crystal potential energy. The polarization opera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubility and molecular structure of 4-amino-3,5,6-trichloropicolinic acid in relation to pH and temperatureMax W. Cheung and James W. BiggarCite this: J. Agric. Food Chem. 1974, 22, 2, 202–206Publication Date (Print):March 1, 1974Publication History Published online1 May 2…
Stripe-geometry PbS diode lasers have been developed with cw output powers of about 1/3 W in the 4.3-μm wavelength region. A maximum cw output power in a single longitudinal mode of about 50 mW, over-all external quantum efficiencies as high as 27%, and incremental internal quantum efficiencies near 60% have been obse…
The aim of this article is to present an introductory review of those aspects of the isothermal galvanomagnetic effects in metals (which here means the electrical resistance, magnetoresistance and Hall effect) which are peculiar to the existence of an anisotropic electrical conductivity. This anisotropy may be intrins…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of Some Derivatives of Poly(ethylenimine)Timothy W. Johnson and Irving M. KlotzCite this: Macromolecules 1974, 7, 2, 149–153Publication Date (Print):March 1, 1974Publication History Published online1 May 2002Published inissue 1 March 1974http…
Edge- and screw-dislocation velocities in ``pure'' MgO single crystals have been measured as a function of stress, temperature, and valence state of the iron impurities in order to identify the rate-controlling drag mechanism for dislocation mobility. Edge dislocations have been observed to move faster than screw disl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmmonia Formation in the Catalytic Reduction of Nitric Oxide. III. The Role of Water Gas Shift, Reduction by Hydrocarbons, and Steam ReformingM. Shelef and H. S. GandhiCite this: Ind. Eng. Chem. Prod. Res. Dev. 1974, 13, 1, 80–85Publication Date (Print):March 1, 1974Publicat…
A recently described technique for direct least-squares refinement of phases has been successfully applied to the problem of phasing a 1.5 Å data set of observed structure-factor magnitudes for C. pasteurianum rubredoxin (M.W. ≃ 6100), given as a starting point a set of phases to 2.5 Å resolution as determined from he…
Abstract Many commercial elastomers exhibit good solvent resistance and high temperature stability but have limited use at low temperature. Fluorosilicone, which exhibits good low temperature properties, is limited in many dynamic applications by its poor physical strength. Phosphonitrilic fluoroelastomers are being d…
Abstract The Raman spectra of SbSBr, BiSI, SbSeI, and BiSeI are investigated and compared with those of SbSI. Following the analysis of each observed mode from one substituted compound to another, a set of normal mode functions is proposed to account for the overall spectral feature of these compounds. The results are…
Abstract Glassy, amorphous thermoplastics experience a nearly universal susceptibility to crack and craze formation in the combined presence of stress and a chemical environment. This susceptibility has been evaluated for styrene‐acrylonitrile copolymers according to the factors which effect craze initiation and those…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and luminescence of the tris(2,2'-bipyridine)iridium(III) ionC. M. Flynn Jr. and J. N. DemasCite this: J. Am. Chem. Soc. 1974, 96, 6, 1959–1960Publication Date (Print):March 1, 1974Publication History Published online1 May 2002Published inissue 1 March 1974https://…
Photoinduced O− ions or V-type centers have been detected in ZnO following ultraviolet irradiation at −196°C. The EPR spectrum of the ions is characterized by g⊥=2.021 and g∥ = 2.0026. The concentration of O− was greatly enhanced when N2O had been adsorbed on the surface prior to irradiation. No oxygen-17 hyperfine st…
A mutant cell strain derived from a Chinese hamster line by mutagenesis with ethylmethane sulfonate requires glycine for growth. In the wild type, glycine synthesis is catalyzed by serine hydroxymethyltransferase (EC 2.1.2.1). Cell fractionation by differential centrifugation and isopycnic sucrose gradient analysis re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCovalency effects on the ligand field splittings of octahedral 5f7 compoundsN. Edelstein, D. Brown, and B. WhittakerCite this: Inorg. Chem. 1974, 13, 3, 563–567Publication Date (Print):March 1, 1974Publication History Published online1 May 2002Published inissue 1 March 1974h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicroporous Polymeric FilmsHarvey S. Bierenbaum, Robert B. Isaacson, Melvin L. Druin, and Steven G. PlovanCite this: Ind. Eng. Chem. Prod. Res. Dev. 1974, 13, 1, 2–9Publication Date (Print):March 1, 1974Publication History Published online1 May 2002Published inissue 1 March…
Abstract— Carotenoid pigments were extracted and purified from wild‐type and mutants 7 and 93a of Sarcina lutea , and tested for their ability to quench 1 O 2 . The wild‐type pigment (P‐438, 9 conjugated double bonds) is as active in quenching 1 O 2 as is β‐carotene. On the other hand, the pigment P‐422 (8 conjugated…
Abstract By X‐ray diffraction and by density measurements as well as by differential scanning calorimetry, the crystallization phenomena of 6‐polyamide(nylon‐6) samples, obtained under different conditions were investigated. Particularly we have analyzed a method for the quantitative determination of the α, γ, and δ (…
Because of the resistance of iron-chromium stainless steels to chloride stress corrosion, this alloy system was used as a base for developing superior resistance to various forms of corrosion by means of alloying with molybdenum, nickel, and the six metals of the platinum group. The effects of these alloying elements…