Materials Literature
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Abstract Polyethylene was spun into a heated chamber, with the spin‐line temperature controlled in the range of 90–120°C. Within narrow limits, the stretch rate of the fiber was also controlled. Spin‐line and crystallization onset conditions were characterized. Characteristics of fibers as‐spun were measured via wide‐…
Résumé La sépiolite chauffée à 300°C et 480°C sous vide a été étudiée avec un microscope électronique en haute-résolution. Les clichés donnent une photographie réelle des structures de la sépiolite naturelle et de la sépiolite anhydre, telles qu'elles ont été calculées par la cristallographie. Les résultats obtenus so…
Abstract Poly‐ N ‐ethynylcarbazole (PEC) was prepared thermally, by using Ziegler‐Natta catalysts, and also by using TiCl 4 and phosphine complexes for initiation. The spectral data (infrared, NMR, x‐ray diffraction, and ultraviolet) were best interpreted based on a cis‐transoidal/cis‐cisoidal stereoblock structure fo…
The growth kinetics of interstitial-type Frank loops in a thin foil of high purity Ni at 450°C has been measured during electron irradiation in a HVEM operating at 650 kV. The depth positions of the loops with respect to the foil surfaces were determined by stereomicroscopy. The experimental data were analysed by use…
Uitrafiltration or dialysis against distilled water was used to separate polymerized ferric hydroxy cations from the monomeric cations in hydrolysed solutions of ferric nitrate. Separated poly[Fe(III)-OH] cations were polydispersed and the positive charge was inversely related to molecular size. The separated poly[Fe(…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe infrared spectrum of a molecular aggregate. The hydrocyanic acid dimer isolated in an argon matrixJ. PacanskyCite this: J. Phys. Chem. 1977, 81, 24, 2240–2243Publication Date (Print):December 1, 1977Publication History Published online1 May 2002Published inissue 1 Decemb…
Abstract The surface charge characteristics of a range of synthetic amorphous aluminosilicates, hydrous alumina, hydrous silica and two allophanic soil clays were determined by the retention of Na + and Cl − as counter-ions from 0.1 M NaCl solution. In the pH range investigated (3–9), only negative charges could be de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1,3(Nonbonded) carbon/carbon interactions. The common cause of ring strain, puckering, and inward methylene rocking in cyclobutane and of vertical nonclassical stabilization, pyramidalization, puckering, and outward methylene rocking in the cyclobutyl cationNathan L. Bauld,…
The feasibility of spray coating transparent cadmium stannate electrodes onto glass has been demonstrated. Both cadmium stannate phases, Cd 2 SnO 4 and CdSnO 3 , can be deposited. The lowest electrical sheet resistances (10–20 Ω/□) and good optical transparency were obtained in CdSnO 3 films. With Cd 2 SnO 4 , clear f…
Styrene–diene (butadiene or isoprene) block copolymers of the SDS or $ ({\rm SD\rlap{--} )} $ type exhibit a plateau in the dynamic storage modulus located between the glass transitions of the polydiene and polystyrene domains. When the polydiene is the continuous phase, the height of this plateau can be estimated wit…
The susceptibility to stress corrosion cracking (SCC) in caustic solutions of austenitic materials for steam generator tubing, both for liquid metal fast breeders and pressurized water reactors (Type 316, and Alloys 600 and 800) has been compared as a function of: (1) The concentration of the sodium hydroxide solution…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and crystal structure of a neodymium isopropoxide chloride, Nd6[OCH(CH3)2]17ClRichard A. Andersen, David H. Templeton, and Allan ZalkinCite this: Inorg. Chem. 1978, 17, 7, 1962–1965Publication Date (Print):July 1, 1978Publication History Published online1 May 2002P…
Abstract Until now, the different attempts to describe the defects of kaolinites were based on the ideas that (i) the hkl reflections with k = 3 n are Bragg reflections, while (ii) the hkl reflections with k ≠ 3 n are affected by ± b /3 translations or ±2 π /3 rotations. With regard to this conception, this work provi…
Abstract The system AsHg was investigated using low temperature X‐ray diffraction (200 and 120 K). The samples ranging in composition from 1 to 60 at.‐% Hg were alternatively slowly cooled and /or quenched from 700°C. The first series crystallizes as a solid solution of Hg in rhombohedral α‐As. Quenched samples posse…
Abstract This study demonstrates that the pex portion of a typical 42° conically lined shaped charge is not being efficiently utilized. In fact, approximately 40% of the liner height at the apex end of the cone does not provide an efficient jet as far as penetration depth is concerned. In this paper, we present an exp…
It is shown that the intensity of the electronic current backscattered from the surface is the convolution product of the total reflection coefficient by the energy distribution of the incident beam. A deconvolution method has been used to obtain this coefficient and this method is based on a rigorous inversion of the…
Phosphorescence quantum yields and lifetimes of 2-, 3-, and 4- hydroxypyridine and 2-methoxypyridine have been measured at 77 ° K in EPA and alkaline EPA using 285 and 254 nm excitation. The phosphorescence polarization is negative with the exception of 4-hydroxypyridine in alkaline EPA, and lowest triplet state is in…
The ternary borides MgNi 2,5 B 2 and Li 1,2 Ni 2,5 B 2 have been prepared and investigated by X-ray methods. They are isotypic and crystallize hexagonal in the space group P6 2 22—D 4 6 -with the following constants : MgNi 2 .5B 2 α = 4.887 ± 0.002 Å, c = 8.789 ± 0.004 Å; Li 1.2 Ni 2.5 B 2 a = 4.842 ± 0.002 Å, c = 8.6…
funds through Medicaid to provide treatment for conditions found at the time of the screening as well as dental treatment.' The amendments also pro- vide for a monetary penalty against the agency if the individuals needing cor- rective treatment do not receive the necessary treatment. The Department of Health, Educati…
We demonstrate experimentally that deviations of a nearly sinusoidal grating from the exact sine profile strongly influence the shape of the surface plasmon resonance anomalies in higher diffraction orders, especially in the first order. It is shown that this effect can be applied to an accurate determination of the a…