Materials Literature
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Abstract The objective of this study was to develop a test which can accurately predict the contribution of coating characteristics to the control of rates of release of urea from SCU granules. It was assumed that product quality is a function of average coating thickness and uniformity of coating thickness. To achiev…
Photoelectron spin polarizations of 50 and 17% have been obtained with the chalcopyrite-structure semiconductors ZnSiAs2 and ZnGeAs2, respectively, by irradiation with circularly polarized light. A comparison is made with the results obtained from GaAs, which has a zinc-blende structure. An analysis of the chalcopyrit…
Using Auger electron spectroscopy, the region near the front contact of cuprous oxide front-wall solar cells was investigated. In cells showing large photovoltages, a maximum of the copper concentration being by about 4 at.% percent higher than the bulk concentration was observed at a distance of 70 Å from the metal-s…
Abstract. The prevalence of a chlamydial infection in hatchery‐reared adult hard clams Mercenaria mercenaria (L.) from Great South Bay, Long Island, New York was relatively high and seasonally stable. Infection occurred early in life while juvenile clams were still within the hatchery. Fluorescent antibody tests sugge…
Tables of calculated balloon parameters are given for a range of unwinding conditions when conical packages are used. Both single and double balloons are considered. Empirical formulae for estimating the yarn tension at the eye are deduced.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin-inversion and orbital symmetry conspiracy in type A lumiketone rearrangementsSason S. ShaikCite this: J. Am. Chem. Soc. 1979, 101, 10, 2736–2738Publication Date (Print):May 1, 1979Publication History Published online1 May 2002Published inissue 1 May 1979https://pubs.acs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSerendipitous synthesis of a sila-.alpha.-pyran - convenient, penultimate precursor to dimethylsilanoneT. J. Barton and W. D. WulffCite this: J. Am. Chem. Soc. 1979, 101, 10, 2735–2736Publication Date (Print):May 1, 1979Publication History Published online1 May 2002Published…
Abstract The empirical equation, 1/t i = Ae Ei/RT , which expresses the exponential dependence of the reciprocal of crystallization induction time, t i , has been analyzed and shown to be equivalent to the nucleation rate equations derived earlier in Part III (1). Consequently we have used the t i measurements obtaine…
Abstract The oxidative degradation of isotactic polypropylene films coated on well‐defined Cu(Cu 2 O), CuO 0.67 , and CuO films in a temperature range of 90–120°C in a quartz‐spoon‐gauge‐reaction vessel was studied. This catalytic reaction has been compared with the oxidation of polypropylene without copper or oxide f…
Samples of two cotton cultivars were spun with high- and normal-tenacity polyester staple fibers in cotton/polyester blend ratios of 100:0, 67:33, 50:50, 33:67, and 0:100. Stress-strain measurements provided tenacities, elongations, and breaking energies. Based on the stress-strain response of the pure cotton and pure…
A theoretical model and a computational algorithm are presented for the shadow deposition of thin films through a generalized mask of finite dimensions in a vacuum environment. The computer model enables a theoretical study of the deposited-film-thickness profile from extended sources with shadow effect. Numerical eva…
Abstract A series of metal and acid salts having poly(alkylbenzimidazoles) as the parent ligand were synthesized. The room‐temperature electrical resistivity of the parent and the salts was measured. Values for the dc electrical resistivity varied from ∼1 × 10 13 ohm.cm for the neutral polymers to ∼1 × 10 6 ohm·cm for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleHysteresis Behavior in Polyether Poly(urethaneureas) Based on 2,4-Toluene Diisocyanate, Ethylenediamine, and Poly(tetramethylene oxide)C. S. Paik Sung, T. W. Smith, C. B. Hu, and Nak-Ho SungCite this: Macromolecules 1979, 12, 3, 538–540Publication Date (Print):May 1, 1979Publica…
Short‐lived radicals such as (1) can be compelled to undergo unusual reactions if they are generated in the presence of a metal colloid catalyst in aqueous solution. Instead of combining, disprotionating, or dismuting, the radicals (1) participate in a redox process leading to evolution of H 2 , according to the overa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluxional behavior in octahydrooctaborate(2-). A theoretical studyDaniel A. Kleier and William N. LipscombCite this: Inorg. Chem. 1979, 18, 5, 1312–1318Publication Date (Print):May 1, 1979Publication History Published online1 May 2002Published inissue 1 May 1979https://pubs.…
Starting at room temperature the Hall constant of In-doped lead tin telluride increases exponentially with inverse temperature, then decreases, and finally flattens out. This behavior is explained on the basis of autocompensation and the positive temperature dependence of the band gap.
Abstract The vacuum ultraviolet luminescence of pure and doped MgO crystals excited by 10 keV electrons is studied in the temperature region 80 to 450 K. At 80 K the narrow edge luminescence band at 7.65 eV due to radiative decay of free excitons dominates in the emission spectrum of undoped crystals. At thermal quenc…
The pedological development of a chronosequence of four soils ranging in age from 8000 to 115 000 yr was investigated on Baffin Island, N.W.T. All the soils were developed on granitic morainal material in an Arctic environment. The soils were acid and very gravelly with low clay contents. The major clay minerals in al…
Abstract The radioactivity of Greek lignites and their ashes was studied. It was found that the radionuclides in them belong to the uranium series. Fly ashes are relatively rich in radioactivity. Concentrations up to 7 · 10 -5 g/g and 12 pCi/g were measured for 238 U and 226 Ra, respectively. The associated hazards fr…
Thermal degradation of aromatic polyesters (see text for formula) (m = 2, 3, 4, 5, and 6) was studied by pyrolysis/gas chromatography using a Curie-point pyrolyzer directly attached to a gas chromatograph with a thermally stable polar separation column (Thermon-1000) to cover a wide range of the degradation products.…