Materials Literature
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In order to use hydrogen as an energy carrier in modern energy-use systems, it is necessary to find compact, efficient means for storing hydrogen for mobile and (or) stationary applications. Performance evaluations coupled with cost analyses for four major alternatives for hydrogen storage show that storage on activat…
The basic principles of X-ray microanalysis of thin surface films and stratified targets are summarized. The influence of the electron beam accelerating voltage on the analyzed depth is discussed. It is shown that in the field of soft X-rays, the effective depth of analysis is most often limited by the absorption of t…
A major complication of long-term urethral catheterization is catheter blockage by encrustation. We have examined 20 encrusted catheters and in each case crystal formation was associated with the presence of bacterial biofilms on the luminal surfaces. Scanning electron microscopy and X-ray microanalysis indicated the…
ハイドロタルサイトの熱分解によって生成する酸化マグネシウムーアルミニウム固溶体[Mg0.5δAl0.2δ・口0.14O](口はvacancy)の再水和反応を利用し,有害重金属オキソ酸イオンであるCrO22-とMnO4-の除去について定量的に調べた。酸化物固溶体はこれら陰イオンと水分子を取り込みながら層間距離8.7Aのハイドロタルサイト様化合物を形成し,吸着データはFreundlichの吸着等温式によく適合した。この際,二価陰イオンのCrO42-は電荷密度が大きいため,広い濃度領域において一価陰イオンのMnO4-よりも選択的に取り込まれることが確かめられた。また,金属オキソ酸イオンの吸着量の増加にともなって層間距離が不均一になるため…
The thermal decomposition of m-ditoluidinium sulfate (m-DTS) has been studied and 2-methylsulfanilic acid (2-MSA) has been found to be the decomposition product. Isothermal TGA data on m-DTS were fitted in Avrami-Erofeev (n= 2, 3), Contracting area. Contracting cube and Ginstling Brounshtein equations. The Contracting…
The X-ray crystal structure of [lnIII(octaethyloxophlorin)]2 shows that the centrosymmetric dimeric structure places the planes of the two macrocycles 3.25 Å apart but causes only minimal distortion to the porphyrin-like cores of the molecule.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of crosslinks on the miscibility of a deuterated polybutadiene and protonated polybutadiene blendHiroshi Jinnai, Hirokazu Hasegawa, Takeji Hashimoto, Robert M. Briber, and Charles C. HanCite this: Macromolecules 1993, 26, 1, 182–188Publication Date (Print):January 1,…
Removal of a failing bioprosthesis can be a delicate operation and extensive damage can be caused. Eighteen patients with failing bioprostheses underwent excision of the leaflets, then the "new" mechanical valve was sewn onto the "old" bioprosthetic ring. At follow-up, clinical and 2D color-flow echo-Doppler evaluatio…
Abstract Crosslinked poly(hydroxyethylmethacrylate) [poly(HEMA)] beads were prepared by the suspension copolymerization of 2‐hydroxyethylmethacrylate monomer with ethyleneglycol dimethacrylate (EGDMA) in aqueous media which contained only magnesium oxide (MgO) as a suspension stabilizer and also salting‐out agent. The…
"ORGANIC COATINGS: SCIENCE AND TECHNOLOGY VOLUME 1: FILM FORMATION, COMPONENTS AND APPEARANCE." Drying Technology, 11(6), p. 1477
An attempt was made to prepare carbon-metal composites by the heat treatment of graphite oxide (GO) which was ion-exchanged with metal cations. The composites thus obtained were characterized to elucidate the dispersion state and the chemical form of metal species in carbon matrix. It was found that metal species are…
High strength prestressing steels in prestressed concrete structures are protected against corrosion due to passivation resulting from the high alkalinity of the concrete. If depassivation of the prestressing steel occurs due to the ingress of chlorides the corrosion risk can be minimized by application of cathodic pr…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text C. Li, Y. Guyot, C. Linarès, R. Moncorgé, and M. F. Joubert, "Radiative Transition Probabilities of Trivalent Rare-Earth Ions in LiYF4," in Advanced So…
The local structure around Eu3+ ions in sodium aluminosilicate glasses was investigated on the basis of phonon sideband associated with the 5D0←7F0 transition of Eu3+. It was found that the positive charge of Eu3+ was compensated by nonbridging oxygens (NBOs) in Q3 units rather than by the excess negative charge of Al…
X-Ray, transport, infrared, magnetic hysteresis, a.c. susceptibility and Mössbauer studies have been carried out for the system CoFe2O4–CoGa2O4. X-Ray and transport measurements indicate cubic symmetry and p-type semiconductivity, respectively, for the compositions with 0.0⩽x⩽2.0. Hysteresis studies demonstrated the p…
Abstract The structure of Li 2 Mg 2 [Si 4 O 11 ] was determined by single crystal X-ray diffraction. It is triclinic, space group P [unk], with a = 8.645(1) Å, b = 7.401(1) Å, c = 6.884(1) Å, α = 104.71(1)°, β = 101.08(1)°, γ = 99.41(1)°, V = 407.5(6) Å 3 and Z = 2. Least -squares refinements based on 1462 observed re…
Untreated aluminium and aluminium hydrated for 60 s in boiling water have been extrusion-coated with low-density polyethylene (LDPE). The hydration transforms the oxide surface into a porous oxyhydroxide, known as pseudoboehmite. LDPE samples with different melt indices (4.5, 7.5, and 15) were used, which influence th…
Abstract This article provides information on the base material properties of wrought duplex stainless steels (DSS). These properties include microstructure, alloy grades, mechanical and physical properties, and corrosion resistance. The article reviews the applications and microstructural development of DSS. It descr…
The viscosity and thermal properties of glasses in the system Na2O-SiO2 were measured near the transformation temperature. The parameters of fragility, ΔCp and Eη/Tg, increased with an increase in Na2O content. Results of these measurements showed a good correlation between ΔCp and Eη/Tg.
High-speed streak photography of surface breakdown or flashover events along the surface of monocrystalline quartz and polycrystalline alumina specimens is reported. The initiation of visible luminosity was observed to be a function of surface properties of the samples. It has been shown that light could originate ind…