Hypercomplex equations of dynamics

On the basis of the hypercomplex formalism, a system of dynamics equations for material points is introduced, which is a generalization of Newton's equations, and which treats spatial translations and proper rotations in a similar fashion. The notion of generalized forces is formulated in such a way that these have a welldefined physical meaning. Some simple consequences of these equations are discussed.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 1, pp. 95–98, January, 1991.     

Cathode strip chamber for CMS ME1/1 endcap muon station

Seventy-six serial ME1/1 cathode strip chambers have been produced in Dubna. These chambers are the coordinate detectors of the first muon station of the CMS detector at CERN. This paper describes the design of the chamber, its main mechanical parameters, and the results of the cosmic ray test. The text was submitted by the authors in English.     

Properties of BaTiO3 and BaTiZrO3 Coatings Deposited by the Detonation Method

Russian Physics Journal -     

On the Radiation Hardness of Thermostabilizing BaTiZrO<Subscript>3</Subscript> Coatings in situ Deposited by the Detonation Method

The radiation hardness of three types of BaTiZrO₃ coatings obtained by synthesis from the powder mixtures BaTiO₃ + ZrO₃, BaCO₃ + TiO₂ + ZrO₃ (micron size), and BaCO₃ + TiO₂ + ZrO₃ (nanopowder) deposited by the detonation method on metal substrates is investigated. The high radiation resistance of all types of coatings to the action of electrons with an energy of 30 keV and a fluence of up to 4 × 10¹⁶ cm^–2 is established in measurements of the diffuse reflection spectra in vacuum at the place of irradiation (in situ).     

Photodissociation of HBr. 1. Electronic structure, photodissociation dynamics, and vector correlation coefficients

Ab initio potential energy curves, transition dipole moments, and spin-orbit coupling matrix elements are computed for HBr. These are then used, within the framework of time-dependent quantum-mechanical wave-packet calculations, to study the photodissociation dynamics of the molecule. Total and partial integral cross sections, the branching fraction for the formation of excited-state bromine atoms Br(2P(1/2)), and the lowest order anisotropy parameters, beta, for both ground and excited-state bromine are calculated as a function of photolysis energy and compared to experimental and theoretical data determined previously. Higher order anisotropy parameters are computed for the first time for HBr and compared to recent experimental measurements. A new expression for the Re[a1(3) (parallel, perpendicular)] parameter describing coherent parallel and perpendicular production of ground-state bromine in terms of the dynamical functions is given. Although good agreement is obtained between the theoretical predictions and the experimental measurements, the discrepancies are analyzed to establish how improvements might be achieved. Insight is obtained into the nonadiabatic dynamics by comparing the results of diabatic and fully adiabatic calculations.     

Origin of the dynamic transition upon pressurization of crystalline proteins

We study the role of hydration water in the dynamic transition of low-hydrated proteins upon pressurization found recently (Meinhold, L.; Smith, J. C. Phys. Rev. E 2005, 72, 061908). Clustering and percolation of water in the hydration shells of protein molecules in crystalline Staphylococcal nuclease are analyzed at various pressures. The number of water molecules in the hydration shell increases and the hydrogen-bonded network of hydration water spans with increasing pressure. The dynamic transition of protein occurs when the spanning water network exists with the probability of about 50% and hydration water shows large density fluctuations. Formation of a spanning water network upon pressurization promotes protein dynamics as in the case of the dynamic transition with increasing hydration. Properties of hydration water in various thermodynamic states and their influence on biological function are discussed.