Carpet-2 Search for PeV Gamma Rays Associated with IceCube High-Energy Neutrino Events

JETP Letters - Carpet-2 is an air-shower array at Baksan Valley, Russia, equipped with a large-area (175 m2) muon detector, which makes it possible to separate primary photons from hadrons. We...     

Bioglycerol as an Alternative Raw Material for Basic Organic Synthesis

The progress of the biodiesel industry throughout the world led to the overproduction of glycerol, which, in turn, led to a drastic decrease in the glycerol price. This makes glycerol an attractive raw material for preparing various products and intermediates. Procedures for converting glycerol into high value added products are considered in this review.     

Properties of operators of extension and contraction of ideals of algebras of invariants of reductive groups in positive characteristic

V. I. Lenin Tashkent State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 25, No. 4, pp. 53–61, October–December, 1991.     

Nanodispersed Suspensions of Zeolite Catalysts for Converting Dimethyl Ether into Olefins

Nanodispersed suspensions that are effective in DME conversion and stable in the reaction zone in a three-phase system (slurry reactor) are obtained from MFI zeolite commercial samples (TsVM, IK-17-1, and CBV) in liquid media via ultrasonic treatment (UST). It is found that the dispersion medium, in which ultrasound affects zeolite commercial sample, has a large influence on particle size in the suspension. UST in the aqueous medium produces zeolite nanoparticles smaller than 50 nm, while larger particles of MFI zeolite samples form in silicone or hydrocarbon oils. Spectral and adsorption data show that when zeolites undergo UST in an aqueous medium, the acid sites are redistributed on the zeolite surface and the specific surface area of the mesopores increases. Preliminary UST in aqueous media of zeolite commercial samples (TsVM, IK-17-1, and CBV) affects the catalytic properties of MFI zeolite nanodispersed suspensions. The selectivity of samples when paraffins and olefins form is largely due to superacid sites consisting of OH groups of hydroxonium ion H₃O⁺.     

Benzene activation over high-silica zeolites

The effect of treatment conditions of high-silica zeolites on their oxidation-reduction properties in benzene adsorption has been studied.

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Synthesis of nanosized iron(III) oxide and study of its formation features

Nanosized iron(III) oxide has been obtained by thermolysis of iron(III) acetylacetonate using diphenyl ether as a dispersion medium. It has been shown that increase in thermolysis temperature from 180 to 250°C allows one to half the average size of Fe₂O₃ nanoparticles. The introduction of surfactant into dispersion medium also leads to decrease of the average size of particles down to 4 nm. The phase composition of the prepared nano-Fe₂O₃ has been established, the possibility to reduce nano-Fe₂O₃ into iron metal has been shown by temperature-programmed reduction     

Carpet—2 Search for Gamma Rays above 100 TeV in Coincidence with HAWC and IceCube Alerts

JETP Letters - We report on the search of astrophysical gamma rays with energies in the 100 TeV to several PeV range arriving in directional and temporal coincidence with public alerts from HAWC...