Materials Literature
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Abstract Neutron diffraction profiles for cellulose from different sources were compared before and after alkaline hydrogen peroxide (AHP) treatment. It was found that AHP treatment did not cause detectable changes in the structure of highly polymerized cellulose. In measurements on wheat straw, peaks were observed at…
Abstract Films of nylon 6, polypropylene, and ethylene–vinyl acetate copolymers were graft polymerized with acrylamide or dimethylacrylamide to render the hydrated surfaces slippery. Following UV irradiation in air, the films were placed in the aqueous monomer solution and then either heated to 50°C after degassing or…
Abstract Tensile property data for polystyrene samples of varying polydispersity are correlated with various parametric measures of molecular weight. Traditional measures of molecular weight, such as M̄ n , M̄ w , and M̄ z , are shown to be unable to account for the variation of tensile properties with molecular weigh…
Abstract Polystyrene (PS) and polyethylene (PE), along with their reactive counterparts, i.e., polystyrene having oxazoline reactive groups (OPS) and polyethylene with carboxylic acid groups (CPE), were melt blended in a Rheomix mixer. These blends were prepared by mixing these polymers in various proportions under a…
In this paper the magnetic structures of various substituted ferrites are reviewed. Attention is focused on the more usual case of a local canted state. Several systems and detailed magnetic experiments are listed and discussed. Then experimental phase diagrams (tetrahedral-octahedral iron concentrations) are establis…
3Li_2O·2B_2O_3化合物是Rollet等人首先提出的,它是包晶化合物,包晶反应温度在700℃左右.Sastry等人肯定了这个结果.Bouaziz等人发现此化合物在650℃存在一相变,而且在545℃低温分解成2Li_2O·B_2O_3和Li_2O·B_2O_3. 我们用差热分析,多晶X射线衍射等方法对3Li_2O·2B_2O_3玻璃晶化及相变问题进行了研究,从中发现一新相,测定了新相的晶体学参数,对相变过程衍射线的变化规律进行了讨论.
<div class="htmlview paragraph">The process considerations, manufacturability, corrosion properties, paintability, weldability, and formability of nominal 9 to 15 percent electrodeposited zinc-nickel (Zn-Ni) alloy-coated sheet steels for automotive applications were reviewed. Zn-Ni coatings were selected for use…
The need for noise control became obvious when the U.S. Environmental Protection Agency (EPA) began in the early 1970's to seriously investigate the impact of vehicle noise on the welfare of Americans. One way of reducing interior noise in automobiles is through the use of sound absorbing and vibrational dampening mat…
Barium titanate is a well-known ferroelectric material (Tc ≈ 120°C) dominating the dielectric ceramics field for the last five decades and is very widely used in multi-layer capacitors. It is usually prepared via the classical solid state reaction between barium carbonate and titanium dioxide around 1100–1300°C. On th…
Monju, a prototype fast breeder reactor, is now under construction in Japan. Following erection of the reactor containment vessel, construction of the reactor system has begun in parallel with construction of the auxiliary systems and plant buildings. The overall Monju project is described, including project organizat…
The role of sulfide inclusions in hydrogen diffusion and trapping in two steels with different contents of sulfur (0.003 and 0.024%S) was examined. The content of hydrogen in specimens after electrolytic charging in a molten salt bath at 250°C and after different aging times was measured. Tensile tests were conducted…
<div class="htmlview paragraph">Influenced both by styling considerations and by the aerodynamic benefits possible using flush glazing, car designers are making increasing use of glazing on automobiles. This leads to higher throughput of solar radiation into the car. Solar heat load will thus become a greater pr…
<div class="htmlview paragraph">Toyota Motor Corporation has mass-produced turbochargers with silicon nitride ceramic rotors since October, 1989. Those turbochargers have been introduced into Celica and MR-2 which are Toyota sporty-type passenger cars. The designing of ceramic rotor was carried out in order to e…
An experimental model of a new automated pre-preg lay-up process is developed to determine the effects of process parameters on the consolidation and quality of parts made of polyetheretherketone (PEEK) reinforced with carbon fibers (APC-2). Temperature, tape velocity, and applied pressure affect the degree of consoli…
Abstract Contact angles of glycerol and diiodomethane drops were measured on the surface of kaolin pellets covered with different amounts of dodecylamine chloride (DDACl) to as much as one monolayer. For a glycerol drop, the contact angle changed from 25.7° (bare surface) to 45.4° for the surface precoated with 0.125…
<div class="htmlview paragraph">Because of federal regulations defining vehicle protection and damage resistance, major changes in design, appearance and materials selection have taken place since 1973 for passenger car bumpers. These bumper protection standards have changed continually over the past 17 years, l…
<div class="htmlview paragraph">A test programme was performed involving two pairs of vehicles - each pair of the same type and model, technically matched, and equipped with emission control systems including lambda sensors and 3-way-catalysts.</div> <div class="htmlview paragraph">The aim of the pro…
SUMMARY Based on existing formulae for the backscattering coefficient for coated samples, i.e. for samples consisting of one film on a massive homogeneous substrate, a theory for the backscattering coefficient for multilayer structures is derived in a clear mathematical way without using approximations. The resulting…
The use of solid chitin particles for stabilization of oil in water emulsions is evaluated. It was found that the chitin particles can adsorb at the oil water interface, and in view of their surface, properties (γP, γD,) paraffin oil in water emulsions were prepared. Stable emulsions were obtained at high concentratio…
Abstract The MNN Auger spectra of a series of elements, Cd through Te, have been examined as a function of chemical state. The spectra of Cd, In, Sn and Sb do not change shape significantly whether the element is present as a metal, semiconductor or insulator, e.g. Cd, CdTe or CdO. The Kinetic energies of the Auger el…