Materials Literature
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One of the basic quantities characterising a system of interacting particles is the nearest-neighbour distribution function H(r). The authors give a general expression for H(r) for a distribution of D-dimensional spheres which interact with an arbitrary potential. Specific results for H(r) are obtained, for the first…
Abstract Since oxidizability of raw rubber is adversely affected by epoxidation, an attempt was made to bind an amine antioxidant to the rubber molecule through the oxirane group. Effective binding was observed only if the latex is neutralized before addition of the amine. Of the three amines used, 4‐amino‐ para ‐phen…
The one-dimensional Thue-Morse sequence with a generating matrix of determinant 0 has been suggested to be intermediate between a periodic structure and a standard quasi-periodic structure like the Fibonacci sequence. The renormalisation procedure developed in the authors' previous study of the one-dimensional Fibonac…
We have used x-ray photoelectron spectroscopy to measure the valence-band offset in situ for strained Si/Ge (100) heterojunctions grown by molecular beam epitaxy. Si 2p and Ge 3d core level to valence-band-edge binding energies and Si 2p to Ge 3d core level energy separations were measured as functions of strain, and…
Abstract The low temperature surface and bulk nitration of cellulose has been investigated by electron spectroscopy for chemical analysis (ESCA), 13 C‐NMR and X‐ray diffraction. Acid mix composition has been probed at room temperature and at low temperatures (0–20°C) by Raman spectroscopy. This multitechnique approach…
Abstract Studies on impact and tensile properties of binary blend of PP and ABS and ternary blend of PP, ABS, and LDPE are presented. Variation of impact strength and the fracture surface morphology with blend composition is examined and interpreted. Tensile behavior in the yield region is studied and the trends of va…
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…