Habitat shifts and morphological variation of Pseudevernia furfuracea along a topographic gradient
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Strengthening Mechanism of Cold-Drawn Wire of in situ Cu-Cr Composite
A heavily deformed Cu-Cr in situ composite is quite promising as a material with high strength and high conductivity. In order to make clear the strengthening mechanism of the Cu-Cr in-situ composite, the Cu-15 mass%Cr composite wire, fabricated by the conventional process from the ingot, was investigated in terms of…
Screening Tests on Materials of Construction for the Thermochemical IS Process
Corrosion tests were conducted at two environments in an iodine-sulfur thermochemical water-splitting process. One is 50wt% sulfuric acid solution containing 0.1wt% hydriodic acid at 95°C and 120°C, and the other is gaseous mixture of HI/I2/H2O, the molar ratio of which is 1/1/6, at 200-400°C. In the former environmen…
Control of molecular ordering in guanidinium-functionalized monolayer by carboxylate template molecules
Electron diffraction studies of a [(dioctadecyl)carbamoylmethyl]guanidinium toluene-p-sulfonate (DG) monolayer reveal that the regularity of the molecular arrangement and the size of crystalline domains are controlled through binding of aqueous α,ω-dicarboxylates with various spacer lengths.
Theoretical studies on the catalytic activity of Ag surface for the oxidation of olefins
Systematic theoretical studies for the mechanisms of the epoxidation and complete oxidation of ethylene and propylene over silver surface as well as the reactivity and the stability of oxygen species on Cu, Ag, and Au surfaces have been presented. The dipped adcluster model (DAM) combined with the ab initio Hartree–Fo…
Preparation of Nd-doped BaCeO3 proton-conducting ceramics by homogeneous oxalate coprecipitation
Nd-doped BaCeO 3 have been obtained from homogeneous coprecipitated oxalates when calcined at temperatures T≥1000 °C. Ball-milling of the calcined powders well disperses the agglomerates and consequently has a beneficial effect in the densification process. The calcination temperature has a major influence on the sint…
Photoemission through thin dielectric coating films
Photoemission through thin coating films was studied in the scope of protection of sensitive photocathodes. The transmission of low energy (∼1 eV) electrons was measured for a large number of dielectric films (LiF, NaF, CsF, NaI, MgF2, BaF2, SiO, SiO2, Al2O3, n-C36H74), evaporated in vacuum on CsI and CuI photocathode…
Stepwise assembly in three dimensions: Preparation and characterization of layered gold nanoparticles in porous silica matrices
Arrays of metal nanoparticles with well‐defined two‐ or three‐dimensional ordered structures in a solid matrix have many potential applications, e.g., novel optical gratings, data‐storage systems, and microelectronics. A synthetic method is described for preparing multilayer composite thin films with metal nanoparticl…
The Effect of Testing Speed on the Hairiness of Ring-spun and Sirospun Yarns
This paper examines the effect of testing speed on yarn-hairiness results. The number of hairs in different length groups and the S 3 values are considered in this study. The theoretical analysis shows that the projected hair lengths are influenced by fibre dimensions and rigidity, as well as by testing speed. For ins…
X-Ray diffraction from layers of n-alkanes adsorbed on graphite
The structure of 1 to 80 layers of C 16 H 34 and C 17 H 36 n-alkanes adsorbed on graphite has been studied as a function of temperature using synchrotron X-ray radiation. The measurements confirm that a surface phase of two to four layers, distinct from the bulk adsorbed on the graphite, is formed at room temperature.…
Synthesis and Crystal Structure of Te8[ReCl6], containing the heavy homologue Te82+ of the chalcogen polycations S82+ and Se82+
Abstract The reaction of ReCl 4 with Te and TeCl 4 in a sealed evacuated glass ampoule at 230°C yields silvery, lustrous, moisture sensitive crystals of Te 8 [ReCl 6 ]. The crystal structure determination (monoclinic, C 2/ c , Z = 8, a = 1232.5(9) pm, b = 976.4(4) pm, c = 3114(2) pm, β = 90.85(5)°) shows, that the com…
Generation of unagglomerated, Dense, BaTiO3 particles by flame-spray pyrolysis
Fine particles of dense, high-purity, crystalline BaTiO3were produced by flame-spray pyrolysis. A 0.5-M (Ba:Ti = 1:1) solution of barium acetate, titanium lactate, and water was aerosolized using an ultrasonic generator, and the droplets were delivered into the core of an annular diffusion flame (H2/air) reactor. For…
Synthesis and Properties of Interpenetrating Polymer Networks Composed of Epoxy Resins and Polysulphones with Cross-linkable Pendant Vinylbenzyl Groups
Polysulphones with cross-linkable pendant vinylbenzyl groups (PSF-VB) were prepared via chloromethylation of commercial polysulphones. The curing reactivity of PSF-VB was investigated by differential scanning calori-metry. Interpenetrating polymer networks (IPNs) were prepared based on bisphenol A diglycidyl ether (DG…
Effect of water on the reduction of nickel/alumina catalysts Catalyst characterization by temperature-programmed reduction
The effect of water on the reduction of nickel/alumina catalysts has been studied in relation to characterization of the catalysts by temperature-programmed reduction (TPR). It was demonstrated that the TPR spectra are strongly perturbed by water vapour, and special precautions must be taken to obtain results reflecti…
High-temperature catalyst supports and ceramic membranes: Metastability and particle packing
Parameters and/or processes responsible for the stability of catalyst supports and ceramic membranes are discussed. Two major parameters/processes were identified which are responsible for the stability of sol-gel derived nanostructured oxides at elevated temperatures. They are metastable-to-stable phase transformatio…
Electronic origin of variable denitrosylation kinetics from isostructural {FeNO}7 complexes: X-ray crystal structure of [Fe(oetap)(NO)]
In contrast to the nitrosyl derivative of iron(II) octaethylporphyrin [Fe(oep)(NO)], the isostructural octaethyltetraazaporphyrin complex [Fe(oetap)(NO)] exhibits fast ligand-promoted nitric oxide dissociation in the presence of pyridine and N-methylimidazole.
Synthesis of Regioregular π-Conjugated Poly(thienyleneethynylene) with a Hindered Phenolic Substituent
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Regioregular π-Conjugated Poly(thienyleneethynylene) with a Hindered Phenolic SubstituentHideki Hayashi and Takakazu YamamotoView Author Information Research Laboratory of Resources Utilization, Tokyo Institute of Techn…
Synthesis of lower-valent molybdenum oxides in aqueous solutions by reducing Na2MoO4 with NaBH4
Reduction of Na 2 MoO 4 with NaBH 4 in aqueous solutions at ambient temperatures has been investigated systematically by varying the concentration and volume of NaBH 4 as well as the reaction pH. The reduction products have been characterized by X-ray diffraction and differential scanning calorimetry (DSC). The reduct…
Nucleation and growth of nano-gold colloidal lattices
A two-dimensional array of 10 nm gold colloidal particles is formed by a submonolayer deposition technique using a bifunctional aminosilane followed by a mobility-restoration treatment with alkanethiol, converting the disordered submonolayer deposition to a highly-ordered two-dimensional array.
True Auger Electron Spectra Measured with a Novel Cylindrical Mirror Analyser (Au, Ag and Cu)
A novel cylindrical mirror analyser (CMA) has been used to obtain true spectra using Auger electron spectroscopy (AES) on Au, Ag and Cu. The whole energy distribution for the primary accelerating voltages, ranging from 1 V through to 5000 V, was measured absolutely. Even faint spectra which have not been cited in Auge…