Materials Literature
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Ceramic based nanocomposites can be divided into three categories: intragranular nanocomposite, intergranular nanocomposite and nano/nano composite. The intra- and intergranular nanocomposites, in which nano-sized particulates were dispersed within the matrix grains or at the grain boundaries respectively, were found…
Crack initiation and propagation process in delayed fracture of high tensile strength steel bolt have been studied by Fracture-surface topography analysis (FRASTA) method. The delayed fracture process thus involves a series of crack initiations rather than the continuous growth of a single crack. Crack initiates at th…
When M cells derived from rat liver and then transformed by treatment with 4-dimethylaminoazobenzene were cultured in vitro, the culture became covered with a collagen fiber network. When the M cells were cultured in the presence of more than 10 micrograms/ml heparin, no collagen fiber formation was observed. The inhi…
Numerous implements used in the mining and agricultural sectors undergo constant wear and so require frequent replacement, resulting in significant financial losses. One way of reducing wear related problems is through surface engineering of the wear prone surface. A variety of surface engineering techniques are comme…
The transformers described here are in the multi-megawatt range. They are rapidly becoming more important and have characteristics and features that are different in many ways from those of normal power transformers. Information about them has been incomplete, scattered and hard to find in the literature. Harmonics ar…
Mixed Ni–Mo–W oxides have been prepared by decomposition at 873 K of Anderson-type [NiMo 6-x W x O 24 H 6 ](NH 4 ) 4 5H 2 O (x=0, 2, 3, 4, 6) heteropolyoxometallates. Thermal analysis of the precursors, X-ray diffraction and Raman spectroscopy on the mixed oxides were performed. X-Ray powder patterns, collected at the…
Abstract The clay minerals, kaolin and montmorillonite, were compacted at different pressures up to 300 MPa. The textural characteristics (pore radius, surface area and porosity) of the clay minerals were measured after compaction and related to the particle size and the cation exchange capacity of these clays. Kaolin…
Abstract We measured the absolute rate constants for the hydrogen peroxide oxidation of two different octyl dimethyl amines in isopropanol/water mixtures at 23°C. The amines were 1‐octyl dimethyl amine ( 1 ) and 2‐ethylhexyl dimethyl amine ( 2 ); their structures were analogous to those most often encountered in comme…
One type of localized corrosion, known as “ant's nest corrosion”, in copper tubes is caused by decomposition products from chlorinated organic solvent and some types of lubricant oil. The decomposition products include carboxylic acids, acetates, formates and chlorides. Vinegar is mainly composed of acetic acid, which…
A pseudo-isopiestic method was employed to determine magnesium vapor pressures over liquid magnesium-yttrium alloys. From these, magnesium activities derived and converted to a common temperature of 1173 K using partial enthalpy values from literature. Experimental problems observed in the course of this investigation…
The effect of coordination number on 27Al NMR chemical shift was studied using ab initio molecular orbital calculation. In order to mimic Al of four-, five- and six-coordinations Al, the clusters of Al(OH)4-, Al(OH)52- and Al(OH)63- were employed for the calculation. The obtained shifts for Al(OH)4-, Al(OH)52- and Al(…
Clarifying material dynamic behavior is of the highest priority for safety evaluation of any structure under an impact problem. Grasping the strain rate dependence of material is necessary for the evaluation of structural integrity. To derive the strain rate dependence, the impact tensile tests should be done in a way…
The effect of the substitution of Te for Cu or Pb in nominal compositions on the formation of the high-Tc phase and on the thermal stability of the high-Tc phase under reannealing conditions at temperatures (500-800°C) lower than the formation temperatures such as 850°C in Bi-Pb-Sr-Ca-Cu-O (Bi-based system) supercondu…
The mechanical and dielectric properties of three kinds of poly(lactic acid-coglycolic acid) (PLG) with different molecular weights and polydispersities fractioned by ultrafiltration were investigated by dynamic mechanical thermal analysis (DMTA) and dielectric measurement. All samples showed typical behaviour of amor…
Parietal cells, which exist in the stomach and in Meckel's diverticulum of the ileum, secrete hydrochloric acid by means of H+,K(+)-ATPase (alpha- and beta-subunits) in the human body. Although parietal cells are generated from progenitor cells (stem cells), their lifespan (approximately 150-200 days) is distinctly lo…
The simultaneous two‐photon excitation energy transfer (SEET) was demonstrated for the first time using trichromophoric model compounds. Two identical donors (A–antenna) were covalently linked to an energy acceptor unit (T–target) with different energy levels preventing energy transfer of a single photon. At high inte…
Different types of molecular motion in confined nematic liquid crystals are briefly discussed with emphasis on their detectability by methods of nuclear magnetic resonance and relaxation. The review is illustrated by some recent experimental and theoretical results in this field.
Adsorption equilibria for solvent dehydration, namely, removal of trace water from solvents by inorganic adsorbents such as silica gels and activated alumina, were measured for various combinations of solvents and adsorbents to test the applicability of the capillary phase separation concept to these systems. The conc…
Specimens of 316L stainless steel are irradiated with 2.5 MeV He+ ions at temperatures of 400,500 and 550℃,respectively.For each implantation the dose and dose rate are separately 2.5×1021 ion/m2 and (3.2—3.8)×1016 ion/m2s-1.Bubble structures are investigated with cross sectional transmission electron microscopy(XTEM)…
Thermoplastic polyimides are a relatively new class of polymers that exhibit high-temperature stability and are useful in composite applications. One such material is Avim-id® K3B reinforced with Magnamite® IM7 graphite fibers. This composite system exhibits excellent strength and toughness, retains its strength and t…