Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Oxidation behavior of titanium boride (TiB2) powder was investigated by thermal analyses (DTA and TG) and X-ray diffraction. From the DTA and TG analyses, a broad exothermic peak with a continuous weight gain was observed between 450 and 750°C. The exothermic peak was bimodal with a minimum around 550°C. High-temperat…
A series of bis(axially ligated) complexes [FeIIIL1(L′)2]+(H2L1= 3,7,12,17-tetramethyl-8,13-divinylporphyrin-2,18-dipropanoic acid; L′= ethyl-, n-propyl-, n-butyl-, n-octyl-, n-decyl-, n-dodecyl-, n-octadecyl-amine, 1,2-diaminoethane, morpholine or piperidine) have been prepared in solution and their electronic absorp…
Abstract The thermal decomposition of polyhalite (K 2 SO 4 · MgSO 4 · 2 CaSO 4 · 2H 2 O) was investigated by DSC/TG and X‐ray powder diffraction. The decomposition of the polyhalite starts at 285 °C in releasing the crystal water within one step. Simultaneously the decomposition of the polyhalite into anhydrite and tw…
Fourier transform infrared (4000-200 cm1) and Raman (3500-50 cm−1) spectra are reported for metal(II) halide 3,5-lutidine (3,5-dimethylpyridine) complexes of the following stoichiometries: M(3,5L)4X2 M=Co or Ni, X=C1 or Br; M=Mn or Cu, X=Br; M=Cd, X=I; M(3,5L)3X2 M=Fe, X=C1; M=Cu, X=Br; Hg(3,5L) X2 X=C1 or Br. Vibrati…
In the carbothermal reduction-nitridation method of producing silicon nitride powder, the effects of addition of silicon nitride seeds on the particle size and α-content in the resulting silicon nitride powder were investigated. The ratio of carbon to silica was determined to be 2.2, which is somewhat higher than the…
The short-range order of a series of sodium−iron phosphate glasses has been studied through X-ray diffraction with the purpose of investigating the structural role of iron ions in these glasses. Fe−O bond lengths and coordination numbers were obtained by simulating the difference radial curves calculated by subtractin…
Abstract Various metallocenes were tested for syndiotactic polymerization of propylene. Reduction in the amount of costly methylalumoxane (MAO) or replacement with the other components was accomplished. Small modifications in the metallocene ligands brought about remarkable differences in the resulting catalysts conce…
Several kinds of porphyrin derivatives covalently connected with adenine, thymine, guanine, cytosine or adenine-thymine pair in a stacking mode between the porphyrin and nucleobase moiety have been synthesized via amide formation reaction of (2-aminophenyl)porphyrin derivatives with nucleobase-alkanoic acids, and char…
Thin (∼10 nm) BaO films on tungsten substrates, prepared at specific coverages from multilayer Langmuir−Blodgett precursor films, were heated to different temperatures between 200 and 1200 °C in a vacuum environment. The chemical changes occurring at the BaO/W interface were characterized by X-ray photoelectron spectr…
Studies involving moisture levels, trash levels, gin machines, and types of cotton were conducted to assess their impact on market value and fiber properties after processing with various gin machinery sequences. Selecting the optimum machine sequences increased monetary values for Study 1 from $12.22 to $20.85 per ba…
The relaxation of the segmental orientation and the chain extension in polycarbonate have been studied by infrared dichroism and heat shrinkage after a step strain deformation to a draw ratio of λ = 1.75. This makes it possible to distinguish between local relaxation mechanisms (Rouse) and large-scale relaxation mecha…
A series of different isodesmic and homodesmic reactions defining strain energies in 3-membered rings are described and discussed. One isodesmic and one homodesmic reaction are applied numerically with the purpose of estimating strain in heterosiliranes including second-row and third-row heteroatoms. All molecules inv…
The reactions of Ga(CH(2)CH(3))(3) with variable amounts of elemental sulfur, S(8), in toluene or benzene at different temperatures result in the insertion of sulfur into the Ga-C bonds to form the compounds Ga[(S-S)CH(2)CH(3)](3) (I) and Ga[(S-S-S)CH(2)CH(3)](3) (II). Compound I was isolated from the reaction at low…
Syntheses of rhabdophane-(Y) (hexagonal YPO4·nH2O (n=0.5 to 1) were carried out by precipitation from aqueous solutions of Y(NO3)3·6H2O, (NH4)2HPO4 and citric acid with the mixing mole ratios of (NH4)2HPO4/Y(NO3)3·6H2O=4 and citric acid/Y(NO3)3·6H2O (C/Y)=5 to 30. Rhabdophane was obtained when those solutions were mai…
Tritium retention measurements have been performed for two carbon composites both before and after neutron irradiation. These two composites were FMI-222 manufactured by Fiber Materials Incorporated and MKC-1PH by Mitsubishi Kasei. The neutron irradiations were performed in the High Flux Isotope Reactor (HFIR) at Oak…
The effect of specific ions present during the precipitation of alumina precursor (aluminum hydroxide) on resulting alumina surface acidity has been investigated. It was found that both the method of pH control and the nature of ions introduced to the slurry apparently affected the phase composition of aluminum hydrox…
Reactions of benzophenone ketyl radicals with the water-soluble iron(III)porphyrin, [FeIII(tpps)]3–[tpps =meso-tetrakis(p-sulfonatophenyl)porphyrinate], and a nitric oxide adduct of the iron(II) form of the porphyrin, [FeII(tpps)(NO)]4–, have been studied by laser photolysis in aqueous solutions. Reactions of ferricyt…
The possible use of tungsten as divertor target material is discussed. In addition to its extremely low sputtering yields, another very favourable aspect of this material is the high probability of prompt redeposition. First experimental observations are encouraging. The erosion fluxes from a tungsten target tile are…
Diffusible hydrogen behavior in zinc electrogalvanized high strength steel has been investigated by use of a newly developed hydrogen content determining method for better understanding of delayed fracture of electrogalvanized high strength steel.For as-electrogalvanized high strength steel, there are two peaks on the…
Structure factors for small, hydrothermally grown samarium orthoferrite, SmFeO3, were measured with focused A = 0.7 A synchrotron radiation. Approximate high symmetry in the Ap images indicates that cations deform the electron density far more strongly than the O atoms. The most obvious effect is on distribution of th…