Materials Literature
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Titania powders have been prepared by the thermal hydrolysis of titanium sulfate at 80°C in a mixed solvent of n ‐propyl alcohol ( n ‐PrOH) and water. The morphology of the powders was greatly influenced by the volume ratio in n ‐PrOH to water (RH ratio) of the solvent. An RH ratio of 1.0 was essential for the formati…
A determination has been made of the glycerol concentration required to form an amorphous glass at 100 K with each of the 50 Crystal Screen I Solutions (Hampton Research, Laguna Hills, California, USA) which form a coarse matrix screen of crystallization conditions for macromolecules. These measurements give a startin…
Free amino groups in β-chitin from squid pen were acetylated to obtain N-acetylated β-chitin. After careful control of degree of acetylation, thermal and mechanical properties of β-chitin and N-acetylated β-chitin were compared. The structural differences of β-chitin and N-acetylated β-chitin were characterized by Fou…
The effect of molybdenum on the electronic structure of the passive films formed on ferritic (Fe‐Cr and Fe‐Cr‐Mo) stainless steels is examined by capacitance and photoelectrochemical measurements. The capacitance study is supported by a mathematical analysis of the Schottky barrier developed at the semiconductor‐elect…
The effect of confinement on the crystallinity and chain orientation of ultrathin poly(di-n-hexylsilane) films has been investigated using UV absorption, fluorescence and IR spectroscopies. UV absorption measurements in a series of poly(di-n-hexylsilane) films having thicknesses between 50 and 3500 Å have shown that,…
The GLIADEL® wafer is a polyanhydride implant used in the treatment of malignant glioma, in which the anticancer agent carmustine (BCNU) is incorporated into a copolymer matrix consisting of 1,3-bis(p-carboxyphenoxy)propane (CPP) and sebacic acid (SA) in a 20 to 80 molar ratio (p(CPP:SA, 20:80)). It is crucial to dete…
Abstract Injection‐molded talc‐filled polypropylene (PP) composites have been exposed to ultraviolet (UV) radiation in the laboratory for periods up to 26 weeks. The extent of chemical degradation has been assessed by means of Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC), and…
In order to elucidate how the oxide‐ion electron mixed conduction in an oxide cathode affects the kinetics of the cathode reaction in solid oxide fuel cells, a compact layer was prepared as a working electrode on the electrolyte of 3 mole percent doped by a laser flash evaporation method, and electrochemical measureme…
Other| October 01, 1996 Effects of pressure on order-disorder reactions Robert M. Hazen; Robert M. Hazen Carnegie Institution of Washington, Geophysical Laboratory and Center for High Pressure Research, Washington, DC, United States Search for other works by this author on: GSW Google Scholar Alexandra Navrotsky Alexa…
Abstract A detailed study of weathered pyrochlore in the laterite above carbonatite at Lueshe, NE Zaire, has been made in order to determine its chemical and textural variations. Pyrochlore in fresh carbonatite at Lueshe is close to an ideal formula of (Ca,Na) 2 Nb 2 O 6 (OH,F) (where a general formula is A 2−x B 2 O…
A stress analysis is made of Hertzian contact deformation in relatively tough ceramics with heterogeneous microstructures, where the response is essentially quasi‐plastic rather than ideally elastic‐brittle. Contact data for two such heterogeneous ceramics, a micaceous glass‐ceramic with modest hardness and a silicon…
A novel technique has been developed for the direct non-contact measurement of the radial deformations of a specimen during a compression Kolsky bar (split-Hopkinson pressure bar) experiment. Application of the new technique makes possible an analysis of the compression Kolsky bar experiment in terms of finite deforma…
The transient pressure generated by the interaction of short-pulsed laser light with the liquid–solid interface is studied quantitatively. A KrF excimer laser beam of tens of nanoseconds pulse duration irradiates water on a solid surface and induces rapid thermal expansion and explosive vaporization. The pressure puls…
A molecular dynamics simulation of polymeric brushes immersed in a melt of mobile polymer chains is presented. The brush height and monomer density profiles are presented for chains of length N grafted at one end to a solid surface immersed in a melt of polymers of the same type. As the chain length P of the free chai…
Resonant grating-waveguide structures formed with InP/InGaAsP semiconductor materials were tested to show light modulation at a wavelength of 1.55 microm. Narrow, subnanometer resonant spectral bandwidths and a ratio of ref lected intensities between resonance and away from resonance of greater than 50 were measured.…
The 1.4-kb downstream region from a nitrilase gene (nitA) of an actinomycete Rhodococcus rhodochrous J1, which is industrially in use, was found to be required for the isovaleronitrile-dependent induction of nitrilase synthesis in experiments using a Rhodococcus-Escherichia coli shuttle vector pK4 in a Rhodococcus str…
1. Using a replicated survey design at the catchment scale, we compared the composition and diversity of diatom communities in three stream groups in the Middle Hills of Nepal: semi‐natural reference (Arun Valley), enriched by agricultural runoff (Likhu Khola) and grossly polluted by sewage (Kathmandu Valley). We samp…
Young’s modulus of porous silicon samples, with porosity ranging from 36% to 90%, is measured by the nanoindentation technique. The analysis of the nanoindentation data, including the specific problem linked with porous materials, is presented. The Young’s modulus values Ep thus obtained appear to be drastically depen…
The optical appearance of yttrium thin film electrodes can be electrochemically switched from mirrorlike to highly transparent by making use of the hydride‐forming properties of Y. A strong alkaline solution is a suitable electrolytic environment for obtaining stable electrochromic electrodes. The presence of a thin P…
Abstract Conservation of electric current and magnetic flux can be explicitly enforced by modeling Maxwell's equations on a staggered grid, where the different field components are sampled at points offset relative to each other. A staggered finite-difference (SFD) approximation gives divergence-free magnetic fields a…