Materials Literature
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Earlier studies have shown that the presence of excess sodium in high‐level nuclear waste can give rise to increased leachability when the waste is incorporated in Synroc‐type titanate ceramics. Freudenbergite (Na 2 Al 2 Ti 6 O 16 ) can incorporate sodium and it exhibits satisfactory leaching resistance in water and r…
Abstract Darstellung und Kristallstruktur von SnTl 4 Se 3 werden beschrieben. Die Verbindung kristallisiert in der Raumgruppe P4/ncc als niedersymmetrische Verzerrungsvariante des In 5 Bi 3 ‐Typs, der selbst eine isopuntale Unterfamilie des Cr 5 B 3 ‐Typs ist: a = 852,2(2) pm, c = 1 272,2(6) pm, c/a = 1,49, Z = 4. Es…
The early stages of oxide film passivation of corroding surfaces in aluminum etch tunnels and pits were investigated. Passivation was initiated by step reductions in applied current. A mathematical model for passivation was used to predict experimentally measured potential transients during the first millisecond after…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of Stereoregularity of .gamma.-Irradiation Canal Polymerized Polyacrylonitrile by 1H 2D J-Resolved NMR SpectroscopyMasatomo Minagawa, Koichi Ute, Tatsuki Kitayama, and Koichi HatadaCite this: Macromolecules 1994, 27, 13, 3669–3671Publication Date (Print):June 1…
Temperature dependences of $^{39}\mathrm{K}$ and $^{85}\mathrm{Rb}$ nuclear-quadrupole resonance frequencies have been measured in tetragonal paraelectric phases of ${\mathrm{KH}}_{2}$${\mathrm{PO}}_{4}$, ${\mathrm{KH}}_{2}$${\mathrm{AsO}}_{4}$, ${\mathrm{RbH}}_{2}$${\mathrm{PO}}_{4}$, and ${\mathrm{RbH}}_{2}$${\mathr…
Maturity of cotton fibers refers to the extent of development of their secondary wall and is an important characteristic. To characterize and quantify cotton maturity, we have developed an imaging system based on our previous research on fiber cross- sectional shape analysis. In this paper, we focus on methods of char…
Abstract The electroinitiated polymerization of N ‐vinyl‐2‐pyrrolidone has been investigated. After electrolysis at controlled potential, a thin, covering, and homogeneous film of poly( N ‐vinyl‐2‐pyrrolidone) appears on the electrode. The insolubility of the polymer in its classical solvents implies the existence of…
A systematic efficiency analysis for shape memory alloy (SMA) actuators is presented. Two different actuator configurations are investigated, and the SMA properties which govern efficiency are determined. The efficiency is shown to be a function of yield stress, recovery stress, maximum strain, latent heat of transfor…
Abstract In specimens of Mn skarn from the type locality of Långban, hyalotekite, (Ba,Pb,K) 4 Ca 2 − (Si,B,Be) 12 O 28 F, occurs in a matrix consisting mostly of aegirine (⩽22 mol.% CaMnSi 2 O 6 ), andradite (⩽27 mol.% Mn 3 Fe 2 Si 3 O 12 ), hematite, pectolite, quartz, calcite, baryte, barylite, and hedyphane. Melano…
The high P fixation capacity of soils rich in x‐ray amorphous minerals has been well documented. Some Andisols in central Guatemala which have received additions of volcanic ash have extraordinarily high extractable P levels with acidic extractant. These ash materials have low fixing capacities but they weather rapidl…
Abstract XPS measurements were performed on in situ split KTaO 3 , KNbO 3 , and cubic KTa 0. 69 Nb 0. 31 O 3 single crystals. The spectra are compared with the results of electronic structure calculations for the pure bulk materials in the cubic phase, based on the self‐consistent scalar‐relativistic linearized muffin…
A cosmid clone which was capable of depleting acetoin in vivo was isolated from a library of Klebsiella pneumoniae CG43 cosmids. The smallest functional subclone contained a 3.9-kb DNA fragment of the cosmid clone. Sequencing of the DNA fragment revealed three open reading frames (ORFs A, B, and C) encoding polypeptid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(ether ketone)s by Fluoride Catalyst SystemsU. Hoffmann, F. Helmer-Metzmann, M. Klapper, and K. MuellenCite this: Macromolecules 1994, 27, 13, 3575–3579Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https:/…
A simple method is presented for the determination of the rotational viscosity of nematic liquid crystals. Theoretical expressions for the rotational viscosity from transient displacement current in nematic liquid crystals are derived. The validity of the expressions is numerically examined. It is found that the rotat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLarge-Ring S6-Thiacyclophanes as Ditopic Macrocycles. Synthesis and Structures of 2,5,8,17,20,23-Hexathia[9.9]-o-cyclophane, HT[9.9]OC, 2,5,8,17,20,23-Hexathia[9.9]-m-cyclophane, HT[9.9]MC, and [Ag2(CH3CN)2(HT[9.9]OC)][BF4]2Broer de Groot, Stephen J. Loeb, and George K. H. S…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectric Double Layer near Soft Permeable Interfaces. 1. Local ElectrostaticMarina Belaya, Victor Levadny, and David A. PinkCite this: Langmuir 1994, 10, 6, 2010–2014Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1…
Abstract A mathematical model has been developed for the prediction of the optimum design of packed and plate columns for the manufacture of nitric acid. The effects of inlet NO x composition, extent of oxidation and extent of absorption in each stage, temperature, and pressure have been included in the model. The opt…
Abstract The crystals of 2-iodoanilinium picrate have three polymorphic forms. The crystal structures of the monoclinic form (form I) and the triclinic form (form II) have been determined by the X-ray diffraction method. The crystals of the third form (form III) are unstable. In forms I and II, 2-iodoanilinium cation…
The crystal structure of kalipyrochlore from the Lueshe carbonatite, Zaire, Fd3m, a 10.604(1) A, has been refined to an R of 1.62% (wR = 1.65%) for 100 observed reflections (MoKa radiation). On the basis of electron-microprobe and X-ray-diffrac tion data, the formula is ([H201o.99SrO.OSCaa.olh:J.os(NbJ.80Tio.2o)l:2(0…
We have investigated the evolution of transient structures in the twist Fr\'eedericksz transition of low-molecular-weight nematic liquid crystals. Planarly aligned cells have been exposed to an in-plane external magnetic field perpendicular to the initial director orientation. The formation of periodic structures was…