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The effects of parameters of the needling process—the amount of needling, the needle penetration, the number of passes, the needle arrangement, and the shape of holes—on the structure and properties of needled fabrics are described. In general, increasing the amount of needling and of needle penetration increases the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of silicon dichloridePeter L. TimmsCite this: Inorg. Chem. 1968, 7, 2, 387–389Publication Date (Print):February 1, 1968Publication History Published online1 May 2002Published inissue 1 February 1968https://pubs.acs.org/doi/10.1021/ic50060a046https://doi.org/10.1021…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTPhotochemistry of some square-planar and octahedral platinum complexesVincenzo Balzani and Vittorio CarassitiCite this: J. Phys. Chem. 1968, 72, 2, 383–388Publication Date (Print):February 1, 1968Publication History Published online1 May 2002Published inissue 1 February 1968http…
Abstract The morphology of nascent (i.e., as‐polymerized) Ziegler‐Natta polymers was studied by optical and electron microscopy and x‐ray and electron diffraction. Observations were made on six polyolefins: polyethylene, polybutene, polypropylene, polystyrene, poly‐4‐methylpentene‐1, and polyisoprene. These polymers w…
An account is given of a study of the dimensional changes of plain-knitted fabrics brought about by various relaxation treatments. A wide range of natural and synthetic-polymer fibres was encompassed. It was found that, for synthetic-fibre fabrics, dry tumbling at elevated temperatures causes higher levels of relaxati…
Spontaneous band magnetism occurs as a transitional electron state, in the thermodynamic sense, between a localized-electron (or small-polaron) state and a conventional collective-electron state. The localized-electron state is well described by crystal-field theory, together with superexchange and double-exchange the…
Potentiostatic polarization measurements on exposed (0001), (101¯0), and (112¯0) faces of single crystals and on polycrystalline zinc were made in aqueous solutions of sodium hydroxide. Crystal orientation was observed to have a well defined effect on anodic polarization with overvoltages for active dissolution increa…
Anomalous thermal expansion and its relation to magnetic properties are surveyed for various Invar alloys. Saturation magnetization was measured for alloy systems (FexNi1−x)92M8, where M=Cu, Co, Mn, Cr, and V, and also for Fe70(RexPt1−x)30 at 4.2°K. Sharp drop of the saturation moment occurs at the average electron co…
Abstract Decomposition products of polymers have been determined by many investigators, but the results are often conflicting because of difficulties in analyzing a large number of products. A comprehensive analysis of the volatile thermal decomposition products of high‐density polyethylene has been made with the late…
Abstract The thermal decomposition of polypropylene hydroperoxide (PPH) consists of two consecutive reactions. The initial, faster reaction has rates up to 60 times that of the slower process. The former is largely suppressed by the addition of an excess of 2,6‐di‐ tert ‐butyl‐ p ‐cresol. The course of reaction is the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituted deuteroporphyrins. III. Iron(II) derivatives. Reactions with oxygen and preparations from chloro- and methoxoheminsJames O. Alben, William H. Fuchsman, Charles A. Beaudreau, and Winslow S. CaugheyCite this: Biochemistry 1968, 7, 2, 624–635Publication Date (Print)…
The Eu2+ ion in alkaline earth fluorides produces two broad absorption bands arising from 4f−5d transitions. The band at 3 eV has a structure with six resolved peaks. This structure is independent of Eu concentration. This band is attributed to transitions from the 4f7(8S) ground state to 4f6(7FJ) 5eg, the peaks being…
The intensity of specularly reflected [(00) reflection] low-energy (5-500-eV) electrons has been measured as a function of temperature for the (100) and (111) faces of palladium and for the (111) face of lead in the temperature ranges 25°-600°C and 25°-225°C, respectively. From the data, the root-mean-square displacem…
Abstract : The degree of long-range order has been determined for 20 binary A15-type phases containing various transition elements. A tendency toward a lower degree of order was noted as the component elements were chosen successively from columns in the periodic table approaching the Mn column. A comparison of the or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible quintet-singlet transition in dithiocyanato-bis(2,2'-dipyridyl)iron(II)Edgar Koenig, K. Madeja, and Kenneth J. WatsonCite this: J. Am. Chem. Soc. 1968, 90, 5, 1146–1153Publication Date (Print):February 1, 1968Publication History Published online1 May 2002Published…
The unpolarized optical absorption spectra of the sheet silicate minerals muscovite, lepidolite, and fuchsite have been examined. The spectra, interpreted on the basis of ligand field theory, indicate that all three minerals contain Fe 3+ and possibly Ti 3+ in octahedral sites. In addition, muscovite is shown to conta…
<div class="htmlview paragraph">A single cylinder investigation was conducted to determine concentration of oxides of nitrogen resulting from combustion of ammonia and air in a spark ignition engine over a range of fuel-air ratios typical of normal engine operation with ammonia. Nitric oxide concentrations excee…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation ROBERT HEIDERSBACH; Clarification of the Mechanism of the Dealloying Phenomenon. CORROSION 1 February 1968;…
The dc and microwave magnetic properties of single crystals of Ba4Zn2Fe36O60(ZnU) were investigated. The saturation magnetization ‖ and ⊥ to c, anisotropy constant and anisotropy field were determined as a function of temperature from 4.2 to 600°K. TC = 673±2°K. At room temperature 4πMs = 3700 G, K1 = 1.4×106 ergs/cm3…
High-yield photoemission, already reported for GaAs-Cs, is also observed for GaAs-Cs-O. Spectral distributions of yields from both GaAs and tungsten with surface coatings of Cs-O indicate that the work function of such coatings is at least as low as that of GaAs-Cs. Photoemissive yields from GaAs-Cs-O have approximate…