Materials Literature
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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…
Abstract The α and β relaxations of a variety of polyethylenes have been extensively studied using lowfrequency dynamic mechanical methods. The main focus of this work has been both the control and the quantitative measurement of the key structural factors that describe semicrystalline polymer systems. The structural…
In this present work, a continuation of others, there is studied the variation of pH, as likewise the concentration of the ions Ca (II), Mg (II), SO4 (II) and Cl (I) of artificial sea water (ASTM D 1141-75) in which there have been submerged the series of test specimens of mortar (1: 3) made with an industrial Portlan…
This study covers point relating to capacity of aggregates to superficially retain part of the water used in mortar and concrete mixtures. It relates this property with the real characteristics of the aggregates. The superficial retention capacity is a decisive factor to determine dosage of mortar and concrete mixture…
Almost all the studies carried out on cements with the addition of flying ash refer to their characteristics and behaviours in pastes, mortars and concretes, always in relation with Portland cement. This time, there has been developed an experimental work oriented to relate between themselves the cements with addition…
In this work there is studied, in the frst place a certain manner of constructing which was practiced by the ancient inhabitants of the Iberian Peninsula, and which was seen by the Romans on their arrival. This form of constructing consisted in making walls of earth called "formaceos", and which are the basis of a rud…
Abstract Alternating and random copolymers of ethyl α‐cyanocinnamate and vinyl acetate were studied. Infrared, 1 H, and 13 C spectra of the copolymers are discussed by comparison with a model compounds, poly(vinyl acetate), and various copolymers. The decomposition temperature and T g of copolymers of various composit…
The spinel systems with has been studied by means of impedance measurement, differential thermal analysis, and x‐ray diffraction analysis. The ionic conductivity increases and the activation energy for conduction decreases with increasing within the solid solution range, in , in , and in . The highest conductivity is…
A preheater with fluidized bed is planned on a pilot scale, capable of being fitted to a rotatory furnace, also of a pilot nature, for the manufacture of Portland clinker. With this it is intended to design a system of dynamic simulation of clinkerization, to obtain clinker of similar characteristics to those which ar…