Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
Abstract The dependence of the physical properties of sulfur vulcanizates of diene rubbers on network structure is reviewed and the influence of degree of crosslinking, crosslink structure, and main-chain modification are discussed. In polyisoprenes, these are determined, in practice, by the balance between three comp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome chemical and analytical aspects of polysaccharide modifications. III. Formation of branched-chain, soluble chitosan derivativesMansur Yalpani and Laurance D. HallCite this: Macromolecules 1984, 17, 3, 272–281Publication Date (Print):March 1, 1984Publication History Publ…
Abstract Based on the extended Hückel molecular orbital calculations, the relation between the anisotropy of the band structure and the arrangement of the organic molecules is investigated for two organic donors, tetrathiafulvalene (TTF) and bis(ethylenedithio)tetrathiafulvalene (BEDT–TTF). The intermolecular overlaps…
Magnetization, magnetic susceptibility, optical microscopy, X-ray diffraction and neutron diffraction measurements have been made on a quenched sample of Ni2MnGa. Room-temperature neutron diffraction patterns indicate a highly ordered Heusler alloy, L21 type, structure. The alloy is ferromagnetic with a Curie temperat…
For pt.III see ibid., vol.16, no.11, p.2087 (1983). The well-known relations for the total amount W of material that diffuses in time t into or out of a semi-infinite solid when the surface y=0 is held at some constant concentration, are to be multiplied by a factor (1+ epsilon 2 U) when the solid contains dislocation…
The temperature dependence of the low-frequency light scattering spectrum of quartz has been studied in the vicinity of the alpha - beta transition and in the incommensurate phase. New excitations have been observed in the range 0-20 cm -1 .
From an experimental determination of the temperature and pressure dependence of the R 25 soft-mode frequency in RbCaF 3 , KZnF 3 and CsCaF 3 , it is shown that the overall temperature-dependent shift of the soft mode is mainly due to the self-energy (the purely anharmonic effect) whereas the quasi-harmonic contributi…