Materials Literature
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Constitutive equations are derived for nonlinear and linear, nonlocal piezoelectric elastic solids. Restrictions arising from the second law of thermodynamics are determined. The theory of nonlocal em elastic solids is introduced and applied to the discussion of Debye screening of an electron in an elastic solid with…
An NAD-dependent 5,10-methylenetetrahydrofolate dehydrogenase has been purified to homogeneity from autotrophically and heterotrophically grown cells of Acetobacterium woodii. The enzymes from the differently grown cells were indistinguishable by gel filtration and sodium dodecyl sulfate electrophoresis and have a fin…
We have determined equilibrium conditions for each reaction in the solid interconversion sequence [Formula: see text], in aqueous carbonate solutions near 25 °C. Our data yield the following Gibbs energies of formation from the elements, Δ f G ° (298.15 K): plumbonacrite, −5310 ± 31 kJ mol −1 ; hydrocerussite, −1705 ±…
Some years ago Possin reported the fabrication of wires as small as 400 Å in diameter with a method involving electroplating into etched particle tracks in mica. We have refined this technique, and can now use it to routinely produce wires as small as 80 Å. These refinements are described, and the possibility of makin…
Compaction behavior and resultant porosity of spray‐dried alumina were examined over a range of pressures from 18 to 345 MPa. The variability in pressed density and pore size was measured as a function of spray‐dried granule size, binder concentration, and powder moisture content. An exponential behavior was found bet…
Abstract The ternary self‐diffusion data of Ferguson and von Meerwall are analyzed using a generalized form of the free‐volume theory of diffusion proposed by Vrentas and Duda. It is shown that the predicative capabilities of this form of the theory are satisfactory and comparable to those of the Fujita version. The l…
CaF2, CaSO4 and CaCO3 are available in mineral form as fluorite, anhydrite (or gypsum) and calcite (or aragonite) respectively. Fluorite and calcite emit intense thermoluminescence (TL). All three materials can be prepared in the laboratory as highly sensitive TL phosphors by crystal growth or sintering techniques. TL…
ABSTRACT The deposition of siliceous valves during asexual reproduction of the pennate diatom, Navicula cuspidata Kütz., is described with emphasis on the cytoplasmic components involved. The events accompanying valve secretion are similar to those already known from other pennate species. After mitosis, the microtubu…
The Leslie coefficients of the nematic phase of concentrated solutions of rodlike polymers are calculated based on the molecular theory given in the previous paper (Kuzuu and Doi: J. Phys. Soc. Jpn. 52 (1983)). The Leslie coefficients are obtained in the form of an asymptotic expansion with respect to the concentratio…
Y‐Si‐A1‐O‐N glasses containing up to 15 at.% nitrogen were prepared. Comparisons of properties of glasses with the same cation composition but with varying N:O ratios show that glass transition temperature, viscosity, and microhardness all increase with increasing nitrogen content.
Water-soluble nonstoichiometric polyelectrolyte complexes (N-PEC) constitute a new class of polyelectrolytes. N-PEC are formed as a result of interaction between oppositely charged polyelectrolytes taken in non-equivalent rations and thus they are macromolecular compounds. An N-PEC particle can be represented as a mac…
Abstract Das Iminoboran t BuB = N t Bu ( 1 ) bildet sich in der Gasphase bei 530°C aus dem Aminoboran Cl( t Bu)B – N( t Bu)SiMe 3 durch Abspaltung von Me 3 SiCl. Das Boran 1 dimerisiert langsam zum Diazadiboretidin [ t BuBN t Bu] 2 ( 2 ). Für Iminoborane typische Reaktionen, nämlich die Ethyloborierung mit BEt 3 , di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopper(2+) in 5-coordination: a case of a second-order Jahn-Teller effect. 2. Pentachlorocuprate(3-) and other CuIIL5 complexes: trigonal bipyramid or square pyramid?D. Reinen and C. FriebelCite this: Inorg. Chem. 1984, 23, 7, 791–798Publication Date (Print):March 1, 1984Pub…
The pressureless sintering to near theoretical density of high‐purity titanium diboride powder, produced in a plasma arc from halogen vapor reactants, is described. Physical and mechanical property measurements between 25° and 1400°C are reported for materials densified at T=1800° to 2275°C. Titanium diboride exhibits…
Abstract Polytetrafluoroethylenes of different crystallinity were analyzed between 220 and 700 K by differential scanning calorimetry. A new computer coupling of the standard DSC is described. The measured heat capacity data were combined with all literature data into a recommended set of thermodynamic properties for…
The paper reports on the processing and properties of composites consisting of thermoplastics and cellulose-based fillers. The plastics used were HDPE, PP, PS, SB, PA 6, and PA 12; the fillers were wood flour (white spruce), cellulose flour (bleached sulphate, pine) and cellulose fibre (bleached sulphate, birch). The…
Pyruvate formate-lyase (formate acetyltransferase; EC 2.3.1.54) of Escherichia coli cells is post-translationally interconverted between inactive and active forms. Conversion of the inactive to the active form is catalyzed by an Fe2+-dependent activating enzyme and requires adenosylmethionine and dihydroflavodoxin. Th…
Share Icon Share Twitter Facebook Reddit LinkedIn Reprints and Permissions Cite Icon Cite Search Site Citation R. P. Reed, A. F. Clark, Lawrence G. Rubin; Materials at Low Temperatures. Physics Today 1 March 1984; 37 (3): 97. https://doi.org/10.1063/1.2916172 Download citation file: Ris (Zotero) Reference Manager Easy…
Alumina and Al 2 O 3 /ZrO 2 (1 to 10 vol%) composite powders were mixed and consolidated by a colloidal method, sintered to >98% theoretical density at 1550°C, and subsequently heat‐treated at temperatures up to 1700°C for grain‐size measurements. Within the temperature range studied, the ZrO 2 inclusions exhibited su…
We introduce a class of models for the motion of a boundary between time-dependent phase domains in which the interface itself satisfies an equation of motion. The intended application is to systems for which competing stabilizing and destabilizing forces act on the phase boundary to produce irregular or patterned str…