The Application Potential of Silicon Photomultipliers for a Camera of a Small-Size Cherenkov Gamma-Ray Telescope for Reducing the Detection Threshold

Technical Physics - Source and noise signals in a new camera of the TAIGA-IACT Cherenkov γ-ray telescope based on silicon photomultipliers (SiPM) have been simulated. It is shown that...     

Thermodynamic Aspects of Dimethoxymethane Conversion into Hydrogen-Rich Gas

Kinetics and Catalysis - A thermodynamic analysis of the conversion of dimethoxymethane by steam reforming and partial oxidation into a hydrogen-rich gas for fuel cell feeding has been carried out....     

Ultrasonic Interferometer on Shear Waves in Liquids

Russian Physics Journal - The developed ultrasonic interferometer on low-frequency shear waves in liquids is described. The problem of the piezo-quartz crystal – liquid interlayer –...     

Gas-Phase Carbonylation of Dimethoxymethane to Methyl Methoxyacetate on Solid Acids: The Effect of Acidity on the Catalytic Activity

The gas-phase carbonylation reaction of dimethoxymethane (DMM) to methyl methoxyacetate on different solid acids was studied. It was established that this reaction was accompanied by the occurrence of a side reaction of DMM disproportionation into dimethyl ether and methyl formate. It was shown that the activity of solid acids in both of the reactions depends on the strength of Brønsted acid sites according to an equation like the Brønsted–Evans–Polanyi–Semenov correlations.     

Structural identification of mouse urinary metabolites of pterostilbene using liquid chromatography/tandem mass spectrometry

Pterostilbene, the dimethoxy derivative of resveratrol, has drawn much attention recently due to its potential beneficial health effects. The metabolic fate of pterostilbene, however, is not well understood. In the present study, we identified nine novel mouse urinary pterostilbene metabolites, pterostilbene glucuronide, pterostilbene sulfate, mono‐demethylated pterostilbene glucuronide, mono‐demethylated pterostilbene sulfate, mono‐hydroxylated pterostilbene, mono‐hydroxylated pterostilbene glucuronide, mono‐hydroxylated pterostilbene sulfate, and mono‐hydroxylated pterostilbene glucuronide sulfate, using liquid chromatography/atmospheric pressure chemical ionization and electrospray ionization tandem mass spectrometry. The structures of these metabolites were confirmed by analyzing the MSⁿ (n = 1–3) spectra. To our knowledge, this is the first report of the identification of urinary metabolites of pterostilbene in mice. Copyright © 2010 John Wiley & Sons, Ltd.     

Bimetallic Rh-Co/ZrO<Subscript>2</Subscript> catalysts for ethanol steam reforming into hydrogen-containing gas

The properties of supported bimetallic Rh-Co/ZrO₂ catalysts in ethanol steam reforming into hydrogen-containing gas were studied. The particles of Rh-Co solid solutions on the catalyst surface were prepared by the thermal decomposition of the double complex salt [Co(NH₃)₆][Rh(NO₂)₆] and the solid solution Na₃[RhCo(NO₂)₆]. It was found that the bimetallic Rh-Co/ZrO₂ catalysts exhibited high activity in the reaction of ethanol steam reforming. The equilibrium composition of reaction products was attained at 500–700°C and a reaction mixture space velocity of 10000 h⁻¹.     

Gas-phase carbonylation of dimethoxymethane to methyl methoxyacetate over the Cs<Subscript>2.5</Subscript>H<Subscript>0.5</Subscript>PW<Subscript>12</Subscript>O<Subscript>40</Subscript> catalyst

It has been shown that cesium hydrogen phosphotungstate Cs_2.5H_0.5PW₁₂O₄₀ is a promising catalyst of the gas-phase carbonylation of dimethoxymethane (DMM) to methyl methoxyacetate (MMA). This catalyst provided the MMA selectivity and yield of 54% and 40%, respectively, under mild experimental conditions: T = 110°C, P = 10 bar, and GHSV = 6000 h^–1 for DMM/CO/Ar = 4/76/20 mol/mol/mol. The carbonylation of DMM to MMA is accompanied by side reactions of DMM disproportionation into dimethyl ether (DME) and methyl formate (MF), as well as by secondary side reactions of MF decomposition into methanol and CO and methanol dehydration into DME.