Materials Literature
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The crystalline-amorphous transformation of the intermetallic precipitates Zr(Cr,Fe)2 and Zr2(Ni,Fe) in Zircaloy under charged-particle and neutron irradiation is studied. In the first section, the experimental results in the literature are reviewed for the three types of irradiation: neutron, electron, and ion. It is…
Rapidly solidified and annealed structures were examined in a series of Al70Pd20TM10 (TM=transition metal) and Al70Pd20TM15TM25 alloys, based on the fact that an Al70Pd20Mn10 alloy consists of a stable icosahedral (I) phase. As a result, new stable I alloys were found in Al70Pd20Cr5Fe5, Al70Pd20V5Co5, Al70Pd20Mo5Ru5 a…
The molecular structure of polyethylene and its copolymers is discussed, with particular attention to its effect on thermal and mechanical properties. The synthesis of polymers of various densities and of the copolymers is examined. The effects of changes in average molecular weight and of molecular weight distributio…
Three kinetic ranges are defined for the photoetching of semiconductors. In these ranges, either the light intensity, the reduction rate of the oxidizing agent, or the solubility or removal of semiconductor oxidation products is rate limiting. The discussion of photoetching kinetics includes the dependence of the etch…
Thermal diffusivities of samples of UO2 and UO2 doped with 3, 5, 7 and 10 w/0 Gd2O3 were measured over the temperature range of 298~2,023 K by a laser flash method. Then thermal conductivities were calculated from them. The thermal conductivity decreased with increasing Gd2O3 content at low temperatures, while it was…
The structure of the boron suboxide B6O has been refined by the Rietveld method applied on X‐ray powder diffraction data. The samples were prepared by hot pressing amorphous boron and B2O3 and the data was collected with a STOE‐diffractometer equipped with a position sensitive detector. The structure belongs to the α‐…
Description 13 papers written by research tribologists are presented in chapters on: • What Mechanical Designers Need in Tribological Modeling • What is Available in Tribological Models • Data Base and Simulation issues for Tribiological Modeling • Simulation of Model Making and Use
A technique developed to measure the dissolution rate of glass fibers in the laboratory under conditions approximating those thought to exist in the lung has been applied to 30 glass compositions in the SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub>-CaO-MgO-BaO-Na<sub>2</sub>O system. Dissoluti…
Cerro Chorrillos and San Jerónimo Quaternary volcanoes of northwestern Argentina erupted on a metamorphic Precambrian basement mostly covered by Paleozoic sandstones. Thickness of the continental crust is about 50 km and depth to the central part of the subducted slab is about 220 km. The lava series consists of absar…
The influence of environment on the cyclic fatigue behavior of a high‐purity alumina bioceramic was investigated using the repeated indentation technique. Tests were conducted in the presence of water, a variety of alcohols, toluene, and simulated physiological fluid environments. The results show that these environme…
Based on in situ X-ray diffraction and EXAFS studies, it is shown that NiTiO3 formed by the reaction of TiO2(anatase) with Ni2+ during the calcination of Ni/TiO2, gives rise to Ni metal and TiO2(rutile) on reduction, a process that may be responsible for the strong interaction between the metal and the oxide support.
An unambiguous particle-size effect has been observed in the desorption of oxygen from a faujasite-embedded platinum dispersion with distinctly different and narrow particle-size distributions. A kinetic analysis of the desorption spectra revealed a relative increase in the activation energy for desorption by about 60…
The structure of gaseous titanium tris(tetrahydroborate) has been determined by analysis of the electron diffraction patterns due to the molecules Ti(BH4)3 and Ti(BD4)3. The molecule has thus been shown to possess three tridentate BH4 groups generating a structure with C3h symmetry overall, implying nine-fold co-ordin…
Abstract Tetrabutylammonium salts of the mixed heteropoly molybdovanadate(V) anions, [Hx−1V(VxMo12−x)O40]4− (x=1–3) were prepared from a Mo(VI)–V(V)–CH3CN system at room temperature. These mixed heteropoly anions were distinguished by their voltammetric behavior; the anions with x=1, 2, and 3 were electroreduced by on…
Abstract The addition of small quantities 1–2% (w/w) of the sepiolite clay EXAL to animal feed increases the feed efficiency and weight of animals. α‐Chymotrypsin, lipase and α‐amylase from bovine pancreas adsorbed on to EXAL at different pH values form active stable complexes at enteric pH values. The enzymes are che…
We present here a spectroscopic structural characterization of octarellin, a recently reported de novo protein modelled on alpha/beta-barrel proteins [K. Goraj, A. Renard and J.A. Martial (1990) Protein Engng, 3, 259-266]. Infrared and Raman spectra analyses of octarellin's secondary structure reveal the expected perc…
The permanent magnet properties and the temperature dependence of Fe–Pt–Nb ternary alloys were investigated by using a recording fluxmeter, a vibrating sample magnetometer and an X-ray diffractometer.The excellent permanent magnet properties in the Fe–Pt–Nb system have been obtained by water-quenching from a temperatu…
All articles of this category Cerium(III) chloride as well as some other lanthanide salts invert the stereoselectivity of the reduction of bicylco[3.1.0]hexane-2,4-diones and bicyclo[3.1.0]hexan-2-ones 1 by sodium borohydride in methanol so as to favour attack of the hydride from the most hindered, concave face of the…
ABSTRACT Drainage of 14 protein‐stabilized foams was determined as a function of time. Drainage conformed to the empirical equation v = V t /(B + t), where v is the volume of drained liquid at time t, V is the maximum drained volume, and B is the time needed to drain V/2. Rate constants and initial rates of drainage c…
Charging occurs in ESCA because a non-conductive sample does not have sufficient de-localized, conduction band electrons available to neutralize the charged centers that build from clustering of the positive holes created with the photoelectron and/or Auger electron ejection. As a result, a positive outer (or Volta) p…