Tests of the OLVE-HERO Calorimeter Prototype at Heavy-Ion Beams at SPS CERN

Physics of Atomic Nuclei - A project of the OLVE-HERO space detector for measurement of the cosmic rays in the range 1012–1016 eV is proposed. It will include a large ionization-neutron 3D...     

QCD PERTURBATION THEORY AND NUCLEI (1) THE ENERGY SHIFTS OF HADRENS AND HADRONS MASS DIFFERENCE MASS DIFFERENCE

QCD perturbation theory for confined quarks and gluons (inhadrons) is discussed.Based on the equivalent potential for the quark-gluon interaction derived, the energyshifts of hadrons and hadron mass difference in MIT bag (cavity) model and correcpond-ing approximation of the w. f. with Gassian form are calculated.     

Solid-phase synthesis of manganese silicides on the Si(100)2 × 1 surface

The solid-phase synthesis of manganese silicides on the Si(100)2 × 1 surface coated at room temperature by a 2-nm-thick manganese film has been investigated using high-energy-resolution photoelectron spectroscopy with synchrotron radiation. The dynamics of variation of the phase composition and electronic structure of the near-surface region with increasing sample annealing temperature to 600°C, has been revealed. It has been shown that, under these conditions, a solid solution of silicon in manganese, metallic manganese monosilicide MnSi, and semiconductor silicide MnSi_1.7 are successively formed on the silicon surface. The films of both silicides are not continuous, with the fraction of the substrate surface occupied by them decreasing with increasing annealing temperature. The binding energies of the Si 2p and Mn 3p electrons in the compounds synthesized have been determined.     

Exact wave solutions of the five-dimensional einstein equations

Exact wave solutions are found for the five-dimensional Einstein equations in a vacuum. The solutions describe the consistent gravitational scalar wave processes [6] and generalize to five dimensions the known four-dimensional Einstein-Rosen and Bondi-Pirani-Robinson wave metrics and the Rosen metric. By means of the method of rotations involving the coordinates of x⁵, the solutions obtained are generalized to the case in which there is an electromagnetic field present. For each of the solutions, the three-dimensional electric and magnetic field strengths are found. Moscow University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 112–117, October, 1996.     

An improved version of NDDO method and its use in the study of bulk and surface properties of titania

A modified scheme for evaluation of two-electron (one-and two-center) integrals within the framework of NDDO method is proposed. A set of parameters for H, C, N, O, F, Cl, Br, and Ti atoms has been obtained. Some models for titania surface active sites have been studied.     

Kinetics of the transfer of the dimethyl-carbamoyl group from N- and O-acylonium salts to azines and their N-oxides

The rate constants and activation energies were determined for a series of reactions involving the transfer of a dimethylcarbamoyl group from the N,N-dimethylcarbamoylonium salts of a series of nitrogen heterocycles and their N-oxides to nucleophiles (azines and their N-oxides) in acetonitrile. The measured values were compared with the structural, reaction, and equilibrium characteristics. L. M. Litvinenko Institute of Physical Organic Chemistry and Coal Chemistry, National Academy of Sciences of Ukraine, Donetsk. Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 33, No. 3, pp. 143–148, May–June, 1997.     

Model analysis of zeolite-like phosphates and their adsorption complexes with water molecules

Molecular models of borophosphates, aluminophosphates, and silicon-containing derivatives of these phosphates have been subjected to quantum-chemical analysis in the MNDO approximation. Bonding energies of these compounds with water molecules have been calculated. Incorporation of silicon atoms into the phosphate matrix increases its hydrophilicity and acidity.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 30, No. 4, pp. 223–226, July–August, 1994.     

Simultaneous Preconcentration and Separation of Chromium(III) and Chromium(VI) at the Low-Temperature Directed Crystallization of Natural Water

It was shown that low-temperature directed crystallization of natural water can be used for separating chromium(III) and chromium(VI). At a moderate crystallization rate (6–10 mm/h), the final part of the ingot (concentrate) is a suspension containing chromium(III) and chromium(VI) in the solid and liquid phases, respectively. It is proposed to separately determine these chromium species by atomic absorption spectrometry after separating the phases by centrifugation and dissolving the precipitate in acids.     

Acetyl transfer from N-acetyloxypyridinium cations to 4-(4′-N,N-dimethylaminostyryl)-pyridine N-oxide and 4-dimethylaminopyridine

Kinetic data are given for the transfer of the acetyl group from the N-acetyloxypyridinium cations of tetraphenylborate salts to 4-(4′-N,N-dimethylaminostyryl)pyridine N-oxide and 4-dimethylaminopyridine in acetonitrile solution. Structural factors were found to affect the rate constants and activation parameters. Correlation equations are given relating the acetyl transfer rate constants with pK_BH+ values of the leaving group and frequencies of the carbonyl vibrations of the salts. Translated from Teoreticheskaya i éksperimental’naya Khimiya, No. 2, pp. 75–77, March–April, 1997.