Materials Literature
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The effect of Zr, Sn, Nb, Ta, Pd, N and O on the corrosion resistance of titanium alloys for medical implants was investigated by measuring the anodic polarization curves at 310 K in 5 mass% H2SO4 and 5%HCl solutions deaerated by high-purity N2 gas bubbling. The critical current density for passivation (Ic) and passiv…
Catalytic oxidation of carbon monoxide has been investigated over a series of LaMn1 –xCuxO3(x= 0–0.5) and La2CuO4 catalysts having perovskite-type and perovskite-related structures. LaMn1 –xCuxO3 catalysts were prepared by a freeze-drying method and showed uniform compositions. The oxidation states of Cu and Mn of the…
The toxicity and efficacy properties of doxorubicin entrapped inside liposomes are sensitive to the physical characteristics of the vesicle carrier system. Studies addressing such relationships must use preparation procedures with the ability to independently vary vesicle size, lipid composition and drug to lipid rati…
During processing, wood-based composites are pressed using extreme heat and pressure for varying lengths of time. Evidence exists that the environmental conditions under which the wood densifies can alter the properties of both the solid wood and the composite product. Given the larger number and extreme nature of var…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAttempts at lithium single-ionic conduction by anchoring sulfonate anions as terminating groups of oligo(oxyethylene) side chains in comb-type polyphosphazenesYuji Tada, Moriyuki Sato, Noboru Takeno, Yoshifumi Nakacho, and Kiyotaka ShigeharaCite this: Chem. Mater. 1994, 6, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMeasurement of the full refractive index tensor in sheared liquid-crystalline polymer solutionsK. Hongladarom and W. R. BurghardtCite this: Macromolecules 1994, 27, 2, 483–489Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inis…
Two thermoelectric materials, BiTe and BiSbTe were prepared by mechanical attrition of elemental powders in a rare gas atmosphere. Nearly 20 min were required for the alloying of BiTe, while 10 h were required for BiSbTe. After attrition, the average powder diameter of the BiSbTe alloy was in 1.4 μm, and the impurity…
A new continuous high pressure extrusion apparatus for the generation of liposomes was designed and tested in the present study. The extruder, which basically consists of an open supply vessel and a high pressure filter holder mounted on a gas-driven pump exhibited superior abilities compared to currently available, d…
Abstract Mechanical properties of polypropylene‐talc composites are measured as a function of talc concentration up to 40 wt.‐%, Young's modulus of filled polypropylene shows linear increase with talc concentration up to double the value of unfilled polymer. Yield stress and Charpy notch toughness decrease with increa…
Abstract Four immiscible blend systems, styrene‐maleic anhydride/styrene‐acrylonitrile (SMA/SAN). styrene‐maleic anhydride/acrylonitrile‐butadiene‐styrene (SMA/ABS), poly(vinylidene fluoride)/SAN (PVF 2 /SAN), and PVF 2 /ABS, were investigated. The effect of adding up to about 10 wt% of a third polymer that is miscibl…
For the crystal growth of LiNbO3, a global analysis of heat transfer in an inductively heated CZ furnace was carried out by use of the finite element method. The effects of the temperature dependency of physical properties such as viscosity and surface tension of the melt, as well as the effect of processing parameter…
The optical properties of Nd/sup 3+/-doped fluoride BIGaZLuTMn glass have been investigated by using steady-state and time-resolved laser spectroscopy. Laser action has been obtained for the first time in this glass by flashlamp pumping. The influence of site-dependent effects on fluorescence lifetime and time-resolve…
The effect of boron on sintering of austenitic stainless steel was studied with reference to atmosphere (nitrogen-hydrogen mixtures) and temperature conditions. Specimens were characterised by the usual microstructural techniques and the boron distribution in the microstructure was also studied by means of Auger elect…
Three series of mesogenic isonitrile derivatives and their platinum(II)(4–6) and palladium(II)(7–9) complexes have been synthesized as a new family of liquid-crystalline materials. The isonitriles themselves exhibit both nematic and smectic mesophases accompanied by considerable decomposition due to their thermal inst…
Abstract
A comparison of the effects of one-, one and a half-, and two-hour turning intervals on changes in the skin surface temperature, interface pressure, and color was conducted on 16 older, healthy adults. Both trochanters and the sacrum were the sites used for measurement. Findings indicated that the greatest increase in…
Description Discusses a variety of approaches to life prediction (across a full range of industries and applications); accuracy of prediction techniques versus actual performance; and the appropriateness of various accelerated corrosion tests to life prediction. 23 peer-reviewed papers cover laboratory and field analy…
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Many of the electrical failures of large electric machines have mechanical precursors. This premise has led to the attempts described here to detect mechanical changes, such as groundwall delamination, by acoustic methods as a means of early detection of incipient failure. By optimally launching an ultrasonic wave int…
Cyclohexanol and cyclohexanone are obtained with high selectivity by direct oxidation with molecular oxygen catalysed by a TiO2/TS-1 system under UV irradiation and mild conditions.