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。
This article describes properties of composites of collagen-hyaluronic acid shaped to layered materials. According to the results, interactions of these two polymers are very strong. The properties can be influenced by chemical crosslinking using glyoxal and starch dialdehyde. The different behavior during enzymatic d…
A function f 2 L 1 (R) tiles the line with a constant weight w using the discrete tile set A if P a2A f(x \\Gamma a) = w almost everywhere. A set A is of bounded density if there is a constant C such that #fa 2 A : n a n + 1g C for all integers n. This paper characterizes compactly supported f 2 L 1 (R) that admit a t…
A borosilicate glass of molar composition 0.${01\mathrm{E}\mathrm{u}}_{2}$${\mathrm{O}}_{3}$\ensuremath{\cdot}0.99(${25\mathrm{N}\mathrm{a}}_{2}$O\ensuremath{\cdot}${50\mathrm{B}}_{2}$${\mathrm{O}}_{3}$\ensuremath{\cdot}${25\mathrm{S}\mathrm{i}\mathrm{O}}_{2}$) has been studied through the optical spectroscopy of the…
Diatoms (Bacillariophyceae) are a widely distributed group of microscopic, unicellular algae that are characterized by siliceous cell walls (frustules). The size, shape and sculpturing of diatom frustules are taxonomically diagnostic. Moreover, because of their siliceous composition, diatoms are often well preserved i…
A method to prevent the reduction of CuO formed on Cu metal during x-ray photoelectron spectroscopy analysis is presented. When a bias voltage of -250 V was applied to the sample surface in the case of non-monochromatic Mg Kα1,2 irradiation, the reduction of CuO to the lower oxide (Cu2+Cu+) was suppressed by 80–90% as…
ABSTRACT Mechanical and barrier properties of corn zein films with butylated hydroxyanisole (BHA), bacterial enzyme, and emulsifier additives were investigated and compared to those of polyvinylidine chloride (PVDC) films. No significant differences (P < 0.05) occurred in elongation, tensile strength, or Young's mo…
Abstract The reaction of cellulose with methoxy‐substituted triphenylmethyl chlorides under homogeneous conditions in the presence of pyridine was carried out with the aim to develop new protective groups for cellulose simply introducable and completely removable under mild conditions. The obtained cellulose ethers di…
Refractory oxide barrier coatings are a promising approach for improving the environmental durability of silicon‐based ceramics in severe environments. The oxidation durability of a newly developed fully crystalline mullite coating on SiC and SiC/SiC composites was investigated under thermal cycling between room tempe…
The first four cumulants of a radial distribution function of diatomic molecules and the first three cumulants for linear triatomic systems have been derived quantum statistically. These moments are directly related to the second- to fourth-order force constants of the chemical bond. The temperature dependence of exte…
Abstract Vulcanization kinetics for a SBR compound was studied by using both curemeter and DSC methods by a kinetic approach. A simplified but realistic model reaction scheme was used to simulate both induction and curing periods simultaneously. Model parameters were extracted from isothermal curemeter experiments. Th…
Abstract Sulfur-cured SBR vulcanizates are devulcanized by high power ultrasonic irradiation in a continuous process under various processing conditions. Crosslink density and gel fraction of devulcanized rubber are measured. The unique dependence of crosslink density on gel fraction of devulcanized samples obtained a…
Calcined (Ba 0.8 Sr 0.2 )(Ti 0.9 Zr 0.1 )O 3 (BSTZ) with added CuO is used as an improved material with which to fabricate surface (or reduction-reoxidation) barrier layer capacitors (BLCs). The CuO-containing BSTZ appears to have less temperature, frequency, and bias dependence of the dielectric characteristics and a…
A new powder diffractometer for synchrotron radiation with six detector arms has been constructed. Five detector arms are attached radially at intervals of 25 degrees to the 2theta axis and form a multiple-detector system. Five scintillation counters coupled with flat Ge(111) crystal analyzers on the respective arms c…
We have examined the adsorption of CO, NO, and H2on modelPd/ceria catalysts, formed by vapor deposition of Pd metal ontoa flat, polycrystalline ceria support, using temperatureprogrammed desorption. For CO adsorption on freshly deposited Pdfilms, a substantial fraction of the CO reacts to CO2in TPD,between 450 and 550…
The embrittlement of poly(hydroxybutyrate), and its copolymers with hydroxyvalerate, on storage at room temperature has been considered in the light of the relaxation of the interlamellar glassy regions and also the development of secondary crystallisation. From a study of the kinetics of the two processes, the first…
The relative conductivity of ${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$ single crystals very close to ideal stoichiometry has been measured as a function of pressure up to P=16 GPa and in the temperature range of 4.2 to 300 K. The pressure dependence of the Verwey transition ${\mathit{T}}_{\mathit{V}}$ and the mechanism of…
Sonochemical decomposition of a series of hydroxybenzoic acids such as monohydroxy-, 3,4-dihydroxy-, 3,4,5-trihydroxybenzoic acids, tannic acid, and reagent and prepared humic acids in water under argon or air atmosphere was investigated. The decomposition followed first-order kinetics at initial stage, and initial ra…
Using a high-resolution digital x-ray camera we have accurately measured the density profiles of several sediments of highly screened polystyrene colloidal spheres suspended in water. From the integral of the profile with height we directly measured the osmotic pressure as a function of volume fraction. The results ar…
Abstract Ground rubber tire (GRT) is devulcanized in a continuous process where the rubber crumb is conveyed by a screw extruder to a thin gap between a stationary die and a vibrating horn. Ultrasound amplitude, gap thickness and the duration of the treatment are varied, and their effect on the rubber properties is st…
An experimental technique for imposing lateral confinement on specimens subjected to dynamic or quasi‐static uniaxial compression has been developed. Lateral confinement is provided by a shrink‐fit metal sleeve installed on the lateral surface of a cylindrical ceramic specimen. Experiments using this technique were pe…