Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic chemistry of porphyrins: spectroscopic and chemical characterization of a rhodium porphyrin-ethyl diazoacetate adductJana Maxwell and Thomas KodadekCite this: Organometallics 1991, 10, 1, 4–6Publication Date (Print):January 1, 1991Publication History Published…
Cavitation corrosion was induced on nodular cast iron used as marine globe valves by means of a 20 kHz ultrasonic vibrator at an amplitude of 25 μm. The rate of weight loss in natural sea water was determined for cavitated specimens under free corrosion and cathodic protection conditions as well as in the quiescent co…
Tensile and impact properties of wood flour filled isotactic polypropylene composites are studied at 0–70 wt% filler levels. Tensile modulus showed an increase whereas tensile strength and breaking elongation decreased with increasing filler content. Restriction in molecular mobility or deformation of polypropylene by…
The structure of B6O has been determined by the Rietveld analysis of X‐ray powder diffraction data. The sample material was prepared by oxidation of amorphous boron with ZnO at 1350 °C in an argon atmosphere. The structure [Space group, R3̄m; ahex.=5.374(2) Å, chex.=12.331 (3) Å], is of the α‐rhombohedral boron struct…
The ferroresonance phenomenon shows at least two different steady states for the same applied voltage, depending on initial conditions. The Galerkin method is well suited for computing periodic steady states, but often shows difficulties in terms of initialization or convergence. To overcome these difficulties, a cont…
The effect of surface modification of various wood fibers [e.g. woodflour and chemithermomechanical pulp (CTMP) of hardwood aspen, and woodflour of softwood spruce] by precoating with only maleic anhydride (MA) and/or poly[methylene (polyphenyl isocyanate)] (PMPPIC) in the presence of benzoyl peroxide (BPO) on the mec…
The complex [Pd2(dppm)2(CN)4][dppm = bis(diphenylphosphino)methane] displays an intense absorption band at 272 nm (εmax= 5.2 × 104 dm3 mol–1 cm–1) attributed to the dσ*→ pσ transition. Crystals of the complex are monoclinic, space group P21/n(no. 14, non-standard) with a= 11.476(2), b= 17.565(2), c= 13.964(2)Å, β= 95…
Interdiffusion coefficients in the β phase of Ti–Cr and Ti–Pd alloys have been determined by Matano’s method in the temperature range between 1173 and 1823 K with (pure Ti)–(Ti-4.62 at% Cr alloy) and (pure Ti)–(Ti-1.84 at% Pd alloy) couples. The impurity diffusion coefficients of Cr and Pd in β-Ti have been determined…
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…