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。
Conventional static and new dynamic drape coefficients of silk woven fabrics are examined precisely to distinguish those features of each classified fabric by its yarn structure using our regression equations. We find that Shantung has large values of static drape coefficient D, and small node number n, revolving drap…
Weight fractions of four dominant phases (C 3 S, C 2 S, C 4 AF and C 3 A) present in the NIST Reference Portland clinkers 8486, 8487 and 8488 were estimated by a series of Rietveld refinements. Calculated powder patterns were derived from the structural data for monoclinic C 3 S and C 2 S, orthorhombic C 4 AF and cubi…
Abstract Modules 〈P〉 and 〈S〉 which taken separetely constitute the structures of pyroxene and spinel respectively, may give rise, in combination, to a wide polysomatic system ranging between these two minerals as end members. The system is firstly discussed on the basis of complex layers 〈P m S n P m 〉, built up by so…
Abstract Ultra high molar mass polyethylene (UHPE) was melted at 160°C for various times or at various temperatures for 5 min and then the crystallization of the UHPE was carried out on cooling. It was found that the crystallization temperature decreased as the heating time or heating temperature increased. During the…
Groupe des solides divisés du MADIREL (Matériaux divisés, revêtements, électrocéramiques) Centre national de la recherche scientifique Université de Provence Bien des solides divisés (soit pulvérulents, soit poreux) qui se trouvent tels quels dans la nature, y ont un rôle important dans les équilibr
Introduction Electret Condenser Microphones (ECM) are used in almost every consumer and communication audio application. The total yearly volume of all ECM's is well over one billion units. Over the years, innovation in ECM's has concentrated mainly on lower cost production and smaller sizes. Other improvements of sen…
Hollow plastic parts can be made by a number of manufacturing methods, but only rotational moulding offers the ability to create one-piece, stress-free parts with attractive economics. However, the fundamental nature of rotational moulding is such that cycle times are long. Consequently, the plastic is subjected to re…
BACKGROUND: Bone graft substitutes are currently used individually or in various combinations in reconstructing bone defects. Nacre, marine mineralized structure, was recently proposed as a very biocompatible and osteoinductive material for use in periodontal and implant surgery. Our aim was to investigate the interac…
An equation of state (EoS) for Ca(OH)2 portlandite has been obtained through measurements of pressure and temperature dependence of volume by means of in-situ X-ray observation. The bulk modulus and its pressure derivative at zero pressure calculated using third-order Birch-Murnaghan's equation of state is 33.1 GPa an…
Accurate modeling of diffusion-induced bubble growth is essential for the development of efficient polymer foaming processes. Consequently, a large number of transport models of this complex phenomena have been formulated. In most previous studies, one or more simplifying approximations have been invoked to reduce mat…
Abstract To assess the polyhydroxyalkanoate (PHA)‐biodegrading capacity of soil, numbers of aerobic poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (PHB/V)‐degrading microorganisms (degraders) were estimated by the film‐MPN method. The numbers of PHB/V degraders were estimated to be 4.3 × 10 5 per gram of dry garden soil…
Polymeric blends composed of conducting polypyrrole chains dispersed in a matrix of polyvinylalcohol containing ferric chloride represent a class of materials whose electrical behavior is intermediary between those of insulating and conducting polymers. To investigate the transport and polarization characteristics of…
Chemical vapor deposited (CVD) diamond materials, grown from low pressure gases activated by plasmas, hot filaments, and combustion flames, were a novelty and scientific curiosity several decades ago. Now, CVD diamond is a maturing material with a wide variety of technological impacts, and with even more exciting appl…
The compensation effect for electrical conductivity is observed for minerals such as calcite, corundum, enstatite, ferrosilite, olivine, leucite, and periclase, which is referred to a linear correlation between the natural logarithm of preexponential factor and activation energy for the electrical conductivity in each…
The synthesis and morphology of nano-sized ZnO and unusual belt-like Zn particles prepared via thermolysis of the molecular single-source precursors [MeZnOSiMe 3 ] 4 (volatile) and [Zn(OSiMe 3 ) 2 ] n (non-volatile) are discussed. These zinc siloxides are simply accessible in high yield through Brønsted acid–base reac…
The laser-induced chemical reactions on the surface of a polymer film were investigated by surface-enhanced Raman scattering (SERS) using chemically deposited silver as the SERS activating layer on the surface of the film. The silver-catalyzed pyrolysis at the outermost surface of the polyacrylonitrile film under lase…
Abstract Samples of a polypropylene homopolymer have been degraded and analysed with regard to chemical composition, molecular weight distribution and chemical composition distribution. FTIR shows the progress of degradation and a decrease in molecular weight can be observed from SEC. CRYSTAF shows that the chemical h…
Abstract The accelerated aging of six formulations of polypropylene highly loaded with calcium carbonate and containing a surfactant additive (stearic acid) as well as an ultraviolet (UV) stabilizer was studied. Degradation was followed by measuring mechanical properties (elongation percentage and impact resistance),…
The pressure-temperature (p - T) phase diagrams for four smectogenic members of the 4′-alkyl-4-cyanobiphenyl homologous series (nCB, n = 9, 10, 11 and 12) over the temperature range 320–410 K and pressure range 0.1–300 MPa (3 kbar) were constructed using DTA. At 1 atm 9CB exhibits nematic and smectic Ad phases, while…
Three-dimensional models of the catalytic domains of Nudel (Ndl), Gastrulation Defective (Gd), Snake (Snk), and Easter (Ea), and their complexes with substrate suggest a possible organization of the enzyme cascade controlling the dorsoventral fate of the fruit fly embryo. The models predict that Gd activates Snk, whic…