Materials Literature
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An earlier model for the oxidative dissolution of spent fuel is further developed by including the reductive effect of H2, which is formed by both the radiolysis of groundwater and the anoxic corrosion of the cast iron insert of the canister. The kinetics of reduction of dissolved uranium species by dissolved hydrogen…
New phosphorus-containing dendrimers bearing ferrocenyl units within the branches were synthesised using a new 1,1’-disubstituted ferrocenyl building block. The structure of one of the synthetic intermediates was determined by X-ray analysis. In every case, one single oxidation was observed for each ferrocenic layer,…
Three mechanisms for the formation of Cu diffusion channels in the Ta layer of a Cu/Ta/SiO2/Si structure are proposed. First, it is suggested that stacking faults formed during the recovery process induce localized regions of high internal energy in the Ta layer, from which Cu channels originate. Second, chemical reac…
We have studied the influence of ballistic jumps on thermal and total diffusion of solvent and solute atoms in dilute fcc alloys under irradiation. For the diffusion components that result from vacancy migration, we introduce generalized five-frequency models, and show that ballistic jumps produce decorrelation effect…
Several series of oxides with Mn in a mixed valence state were studied by means of soft X-ray absorption spectroscopy in order to understand better the nature of the electronic structure of these 3d transition metal oxides. XANES spectra of REMnO 3 , RE 1-x Ca x MnO 3 (RE: La, Pr and Tb) and RE 0.5 A 0.5 MnO 3 (RE–A:…
Silicon nanowires have been fabricated with a triangular cross-section of side length ∼65 nm, and their photoluminescence (PL) properties have been studied. The phonon-assisted PL bands are observed in the near-infrared spectral region. At low temperatures, the PL spectra of the silicon nanowires are quite similar to…
Purification of poly(3-hydroxybutyrate) depolymerase (EC 3.1.1.75) from Paucimonas lemoignei is complicated because the bacterium produces several isoenzymes which are difficult to separate from each other. The phaZ5 gene of P. lemoignei encoding extracellular poly(3-hydroxybutyrate) depolymerase A was functionally ex…
It is demonstrated that the C K α x-ray fluorescence spectra of carbon nanotubes synthesized by electric-arc evaporation of graphite and the spectra of carbon nanotubes produced using catalytic decomposition of hydrocarbons differ in the intensity of the short-wavelength lines. In order to interpret the obtained data,…
Cure characteristics and mechanical properties of acrylonitrile butadiene rubber/reclaimed rubber blends were studied. Minimum torque, (maximum -minimum) torque, scorch time, cure time and cure rate decreased in presence of reclaimed rubber. Tensile strength, elongation at break and compression set increased with incr…
This article describes the physical properties of lyocell fibers spun from an isotropic cellulose spinning dope in N-methyl morpholine N-oxide (NMMO) monohydrate (IPS lyocell fibers). Wide angle x-ray diffraction (wAxD) experiments on the crimped fibers exhibit little difference in the crystal structure of IPS and Ten…
A gene encoding NADP-dependent Ds-threo-isocitrate dehydrogenase was isolated from Haloferax volcanii genomic DNA by using a combination of polymerase chain reaction and screening of a lambda EMBL3 library. Analysis of the nucleotide sequence revealed an open reading frame of 1260 bp encoding a protein of 419 amino ac…
Utilizing a high-sensitivity photomultiplier tube (PMT) and an intensified charge coupled device (ICCD) camera, the light emission from the surface of polytetrafluoroethylene (PTFE) and alumina ceramic samples was investigated in vacuum under a stepped dc voltage in order to study the initiation and development of sur…
This paper presents a theoretical analysis and experimental verification of electro-optic sensors used to measure DC electric fields in space charge environments. Both unipolar and bipolar charge environments were analyzed. The results suggest that in both cases the sensor output is linearly dependent on the measured…
Glass Reinforced Plastic (GRP) rods used in Non-Ceramic Insulators (NCI) were examined for microscopic defects in order to evaluate their role in causing brittle fracture. The rods evaluated utilized different types of glass fibers and resin systems. Niemeyer's generalized approach to Partial Discharge (PD) modeling w…
This paper describes the dependence of the charging characteristics on the electric field distribution on the alumina (Al/sub 2/O/sub 3/) surface as affected by the triple junction in vacuum. For HV electrical insulation design of vacuum interrupter, surface flashover in vacuum is very important problem to be solved.…
Thermal decomposition of a series of 1 : 1 mixtures of typical polymer waste materials [polyethylene (PE), poly(propylene) (PP), polystyrene (PS), polyacrylonitrile (PAN), polyisoprene, poly(methyl methacrylate) (PMMA), polyamide-6 (PA-6), polyamide-12 (PA-12), polyamide-6,6 (PA-6,6), and poly(1,4-phenylene terephthal…
A series of “push-pull” molecules, each incorporating a pentafluorophenyl ring as an inductive accepting group, has been synthesised. The NLO properties of these compounds were measured in solution by EFISH (operating at 1907 nm) and in the solid state by the Kurtz powder technique (at 1907 nm). Values of μβ, the prod…
Abstract Microporous flat films with potential as membranes were produced via melt processing and post‐extrusion drawing from immiscible polypropylene/polystyrene blends containing a compatibilizing copolymer. The blends were first compounded in a co‐rotating twin‐screw extruder and subsequently extruded through a she…
Temperature dependence of atomic coordinates is precisely determined for an iron (II) complex, [Fe(ptz) 6 ](BF 4 ) 2 (ptz = propyltetrazole), by means of synchrotron-radiation (SR) x-ray powder diffraction measurements. The spin state of the Fe 2+ ions is known to change from high-spin (HS; S = 2) to low-spin (LS; S =…
The non-heme iron complex, Fe(TPAA = tris-〚 N -(2-pyridylmethyl)-2-aminoethyl〛amine)(ClO 4 ) 2 , is a bad catalyst for the epoxidation of alkenes such as cyclooctene, cyclohexene and cis -stilbene and for the hydroxylation of alkanes such as adamantane by H 2 O 2 , when compared to the iron porphyrin Fe〚TDCPN 5 P = me…