Materials Literature
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Electrical conductivity was investigated in polycrystalline lead zirconate‐titanate ceramics, with and without various dopants and stoichiometry, fabricated from chemical solutions and mixed‐oxide powders. A multiphase packing‐powder technique was used to control the stoichiometry of the system during sintering. The d…
R.N. Dzinoridze studied the diatoms, silicoflagellates, and ebridians at Sites 336, 337, 338, 339, 340, 343, and 348 (Plate 20). The diatom units of the Pleistocene, namely the Thalassiosira zabelinae unit, Denticula seminae-D. kamtschatica unit, Denticula hustedtii Zone, Denticula hustedtii-D. lauta Zone, and Denticu…
Abstract Numerous polyesters were prepared from 1,2‐ethanediol, 1,3‐propanediol, 1,4‐butanediol, 1,6‐hexanediol, 1,12‐dodecanediol, 1,4‐phenylenedimethanol, and hydroquinone on the one hand and succinyl chloride, glutaroyl chloride, adipoyl chloride, suberoyl chloride, sebacoyl chloride, isophthaloyl chloride, and tet…
The inhibition of corrosion of iron (0.13%C) in hydrochloric acid by thiourea and its derivatives has been investigated. Inhibition is due to adsorption of the molecular species. The maximum of efficiency with low concentrations of thiourea and its N‐substituted derivatives is attributed to the protonation of the inhi…
The simulation of complex fabric deformations, in which the textile fabric is treated as a continuous sheet, requires a suitable formulation of the mechanical behavior of the fabric. The problem is considered within the basic framework of the engineering theory of shells and plates, including some features not previou…
Impurity phases in commercial hot‐pressed Si 3 N 4 were investigated using transmission electron microscopy. In addition to the dominant, β‐Si 3 N 4 phase, small amounts of Si 2 N 2 O, SiC, and WC were found. Significantly, a continuous grain‐boundary phase was observed in the ∼ 25 high‐angle boundaries examined. This…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman spectra and vibrational modes of iron(III) tetraphenylporphine .mu.-oxo dimer. Evidence for phenyl interaction and lack of dimer splittingJ. M. Burke, J. R. Kincaid, and T. G. SpiroCite this: J. Am. Chem. Soc. 1978, 100, 19, 6077–6083Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculation of Three-Dimensional Elastic Constants of Polymer Crystals. 2. Application to Orthorhombic Polyethylene and Poly(vinyl alcohol)Kohji Tashiro, Masamichi Kobayashi, and Hiroyuki TadokoroCite this: Macromolecules 1978, 11, 5, 914–918Publication Date (Print):Septembe…
Abstract The 13 C nmr chemical shifts of the common amino acid residues were measured in D 2 O solutions of the linear tetrapeptides H‐Gly‐Gly‐X‐ L ‐Ala‐OH. For Asp, Glu, Lys, Tyr and His, the titration shifts arising from the ionization of te amino acid side chains were also obtained. These data are compared with the…
Beryllium sulfate tetrahydrate (BeSO4⋅4H2O) has been found to be phase matchable for frquency doubling of 5321-Å radiation. The water white crystal is highly transparent from 1900 to 13 700 Å. The nonlinear optical constant was measured to be d36(BeSO4⋅4H2O) = (0.62±0.06) xd36(KD*P).
ABSTRACT The marine epizoie diatom, Pseudohimantidium pacificum Hustedt & Krasske, is reported for the first time in Florida Current waters of the Western North Atlantic Ocean off the east coast of Florida. The diaom was fround attached to indivieuals of copepod species in the orders Harpacicoida and Cyclopida.
Partial discharges in transformers cause high frequency (ultrasonic) pressure pulses to propagate through the insulating media. These are similar in character to stress waves propagated in solids during crack formation (acoustic emission). The techniques involved in the detection of acoustic emission (AE) are shown to…
Twelve freshwater and/or brackish water species of the generally regarded marine planktonic diatom genus Thalassiosira are known. The morphology based on light and electron microscopy, taxonomy, and distribution of six of them are discussed. The new combinations Thalassiosira faurii (Gasse) Hasle and T. rudolfii (Bach…
The corrosion of 90:10 Cu:Ni and 70:30 Cu:Ni alloys in flowing seawater (1.62 m/s) has been studied as a function of oxygen concentration using the linear polarization, ac impedance, and potential step methods for measuring the polarization resistance. The high nickel alloy is found to be more corrosion resistant than…
The purpose of this study was to determine the forces in the glenohumeral joint for isometric abduction (including all directions of rotation) in the plane of the scapula. The lines of actions of muscles were obtained from 3 upper quarter specimens, electromyographic data was used, as well as geometrical parameters of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spectroscopy for chemical analysis studies of lead sulfide oxidationD. S. Zingg and David M. HerculesCite this: J. Phys. Chem. 1978, 82, 18, 1992–1995Publication Date (Print):September 1, 1978Publication History Published online1 May 2002Published inissue 1 Septembe…
Summary Analyses of glauconites and celadonites from continental sedimentary rocks and sea-floor basalts using X-ray diffraction, electron probe microanalysis, infra-red spectroscopy, and X-ray fluorescence spectroscopy are reported. The minerals are shown to be distinct species; each an isomorphous replacement series…
The effects of annealing conventionally sintered, hot‐pressed, and reaction‐sintered Sic have been investigated by optical and transmission electron microscopy. In conventionally sintered and hot‐pressed bodies, “composite” grains consisting of α‐SiC plates sandwiched between recrystallized β‐SiC envelopes grow rapidl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Onset of Entangled Behavior in Semidilute and Concentrated Polymer SolutionsJ. KleinCite this: Macromolecules 1978, 11, 5, 852–858Publication Date (Print):September 1, 1978Publication History Published online1 May 2002Published inissue 1 September 1978https://pubs.acs.or…
The experimental manifestations of dispersive (non-Gaussian) transient transport in disordered solids are discussed and compared with the predictions of theoretical treatments. The mathematical equivalence of the two theoretical approaches based on the formalisms of continuous-time random-walk (CTRW) and generalized m…