EPECUR setup for the search for narrow baryon resonances in pion-proton scattering

The EPECUR experimental setup has been designed to search for narrow resonant states by precisely measuring differential and total reaction cross sections for pion-nucleon interactions with 1-MeV pion energy steps. Over the 5 years that passed from the submission of the idea of the experiment to the start of data taking in April 2009, a non-magnetic spectrometer with a liquid hydrogen target based on the large-aperture multiwire drift chambers with a hexagonal structure has been built at the universal beamline 322 of the U-10 proton synchrotron at the Alikhanov Institute for Theoretical and Experimental Physics. Owing to the unique properties of the beamline, the beam particle momentum can be measured with an accuracy of 0.1% or better using 1-mm-pitch proportional chambers located at the first focus of the beamline. The design of numerous subsystems of the setup is based on modern electronic components including microprocessors and field programmable gate arrays. All the subsystems have been tuned and tested both individually and as parts of the whole setup. The distributed data acquisition system is based on the widely spread USB and Ethernet protocols, which help achieve high performance characteristics and take full advantage of the industrial solutions.     

The inverse moment treatment from center of mass depth and four dimensionless shape factors

The inverse moment problem is considered for a homogeneous body with a vertical symmetry axis. One calculates the depth of the center of mass and the four dimensionless shape coefficients independent of the mass and density of the body from the linear and angular radii in models. __________ Translated from Izmeritel’naya Tekhnika, No. 2, pp. 10–14, February, 2008.     

The use of nitride ceramics in sensors for determining nitrogen in steels and alloys

Moscow Evening Institute of Metallurgy. Institute of Materials Science Problems, Academy of Sciences of the Ukraine, Kiev. Translated from Poroshkovaya Metallurgiya, No. 8(368), pp. 94–98, August, 1993.     

Comparative analysis of changes in respiration and systemic hemodynamics during activation of GABA receptors in cats and rats]

Rat liver mitochondrial alanine aminotransferase (mALT) is known to be a very unstable enzyme, a property that has hindered efforts to purify it. In this report we examine the possibility of stabilizing mALT with ethanol, trehalose, and protease inhibitors. The presence of ethanol was shown to slow down the inactivation of mALT, increasing its half-life from 1 to 4 h. Trehalose was found to greatly enhance the stability of mALT in a concentration-dependent manner. In the presence of 36.5% trehalose, the half-life of mALT was 85 h. Of the protease inhibitors tested only antipain and chymostatin slowed down the inactivation of mALT but only within the first 24 h following preparation of the crude enzyme. It is concluded that the inclusion of ethanol and trehalose in purification protocols could aid the purification of the enzyme. It is also concluded that the inclusion of protease inhibitors in purification protocols of mALT may not be necessary as its inactivation does not seem to be due to protease activity.     

A hierarchical game under uncertainty conditions with using player risk function and guarantied strategy estimate

A game-theoretic model of optimal interaction of players in a two-level hierarchic system under uncertainty conditions is proposed. The players keep in mind the outcome with the worst value of the uncertain factor, so that the upper-level player also applies guaranteed approach to the lower-level player. The convergence of the type of penalty function method we use has been proved, the problem of passing from iterated limits by the penalty parameters to the conventional limit by means of their match has been solved. The optimality conditions were obtained.     

Structural changes in fibres and films from polytetrafluoroethylene upon γ-radiation

Conclusions It has been found that -irradiation of fibres and oriented films of polytetrafluoroethylene in air leads to shrinkage of the specimens, which is replaced by an elongation on increase in the absorbed dose.The effect of shrinkage and subsequent elongation depends on the state of the specimens: shrinkage is increased upon increase in the stretch ratio and diminishes as a result of preliminary annealing.The behavior of oriented polytetrafluoroethylene upon irradiation is explained from the position of a change in molecular and supermolecular structure.Translated from Khimicheskie Volokna, No. 2, pp. 45–46, March–April, 1990.