Materials Literature
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Experimental programs on fuel behavior during simulated reactivity-initiated-accident (RIA) conditions at the Nuclear Safety Research Reactor (NSRR) in Japan and the CABRI test reactor in France appear to indicate that cladding failures may occur at enthalpy values lower than would be expected. Results from two experi…
We describe laser and mass spectroscopic methods, and related modelling studies, that have been used to unravel details of the gas phase chemistry involved in diamond chemical vapour deposition (CVD) using both H/C (i.e. hydrocarbon/H2) and H/C/O (e.g. CO2/CH4) gas mixtures, and comment on the relative advantages and…
Two lanthanide coordination polymers {Tb(O2CPh)3(CH3OH)2(H2O)}n1 and {Tb2(O2CPh)6(4,4′-bipy)}n2 have been identified and isolated from a methanol solution A of Tb(OAc)3·4H2O, benzoic acid and 4,4′-bipyridine in a 1∶3∶2 ratio. Their structures have been determined by single-crystal X-ray diffraction analyses, which rev…
The dry etching characteristics of ZnO using an inductively couple plasma (ICP) have been investigated, for the first time, as functions of plasma chemistry, radio frequency (rf) table power, and ICP power. The etchant gases resulted in the highest etch rate of ZnO, suggesting that the etching of Zn in ZnO largely inv…
The processing of recycled poly(ethylene terephthalate) (PET) involves thermal and hydrolitic degradation of a polymer, which reduces the molecular weight, the intrinsic viscosity, and the mechanical properties of recycled materials. Degradative effects can be limited by using chain extenders. Preliminary tests show t…
Carbon-doped low k thin films were prepared by radio frequency plasma-enhanced chemical vapor deposition at 400°C from polymerization of tetramethylsilane (4MS) and copolymerization of tetramethylsilane and silane precursor, with nitrous oxide as the oxidant gas. Copolymer thin films from 4MS and precursor show much h…
A molybdenum oxide with high aspect ratio has been synthesized by a template-directed process. The reaction of molybdic acid and primary amines with long alkyl chains, followed by hydrothermal treatment, led to a lamellar molybdenum oxide–amine composite. The subsequent removal of the intercalated amines with nitric a…
Superplasticity was investigated in nanocrystalline Al alloy 1420 to evaluate the scalability of conventional constitutive relationships in the nanocrystalline range. The parametric dependences of superplastic flow were obtained by constant-strain-rate tensile tests in the temperature range 200–300°C and a strain rate…
Dendrimers based on polyhedral oligomeric silsesquioxanes (POSS) cores with 16 PPh2 arms give much higher linear selectivities (14∶1) than their small molecule analogues (3–4∶1) in the hydroformylation of oct-1-ene.
The database reported here is derived using the Combinatorial Extension (CE) algorithm which compares pairs of protein polypeptide chains and provides a list of structurally similar proteins along with their structure alignments. Using CE, structure-structure alignments can provide insights into biological function. W…
A simple one-pot synthesis of size and shape controlled ZnTe nanocrystals using a monomeric molecular precursor, [Zn(TePh)2][TMEDA], has been studied by varying the growth temperature or the templating surfactants.
The polycrystalline La1−xCexMnO3 manganites do not exist in single phase in bulk under the preparation conditions so far employed, but their polycrystalline and epitaxial films deposited by the pulsed laser deposition (PLD) technique form readily in single phase. The cerium oxide (CeO2) remains partially unreacted whe…
We present evidence in favor of the possibility of treating an out-of-equilibrium supercooled simple liquid as a system in quasiequilibrium. Two different temperatures, one controlled by the external bath and one internally selected by the system, characterize the quasiequilibrium state. The value of the internal temp…
A new method for the quantitative determination of the hydrosilylation inhibitor 1-ethynyl-1-cyclohexanol in a poly(dimethyl siloxane) matrix is presented. The method is based on headspace gas chromatography directly from the semisolid sample without solvent addition. The method was found to be both selective and sens…
Дан обзор результатов по постановке и решению задач изгиба и задачи оптимизации конструкции упругого элемента протеза стопы. Протез моделируется в виде консольно закрепленной многолистовой рессоры с искривленными в естественном состоянии листами. Между листами имеет место контакт с возможным отставанием; задача изгиба…
To clarify the delamination mechanism of high-voltage coil insulators made from mica flakes and epoxy resin due to static mechanical stress, the relationships between the shear strength of the insulator and the physical properties of the component materials were studied. The mechanism of their delamination was thought…
Haruhiko, F. (2001). Notomi Kaijiro: An Industrial Art Pioneer and the First Design Educator of Modern Japan. Design Issues, (2), 17. doi:10.2307/1511873
The Jominy end-quench test is used to measure the hardenability of a steel, which is a measure of the capacity of the steel to harden in depth under a given set of conditions. This article considers the basic concepts of hardenability and the Jominy test.
The morphology of barium sulfate (BaSO4), synthesized using the hydrothermal reaction of BaII–aminocarboxylate chelating precursors, was investigated. The precursors ethylenediaminetetraacetic acid (EDTA), bis(2-aminoethyl)ethyleneglycoltetraacetic acid (EGTA) and nitrilotriacetic acid (NTA) were dissolved by heating,…
This paper discusses methods to minimise density gradients in moulded rigid polyurethane foams of densities 0.35 g/cc and 0.80 g/cc. Methods examined were changing the nature and concentration of the amine catalyst, the use of high functionality isocyanates and varying the mould temperature. All methods can reduce the…