Temperature Field in the Active Element of an Electromagnet Performance Criteria for Analytical Calculation of the Nonstationary

To justify the accuracy of the engineering calculation of the nonstationary temperature field in an active element of finite size, we propose to introduce into practice the performance criteria of calculation.     

Laser ignition of nickel-aluminum powder systems

A method for determining the thermokinetic constants of the SHS reaction and thermophysical properties of the initial mixture and reaction products involving the use of laser initiation of the reactive mixture has been developed. A technique for experimentally studying the ignition process of the reacting mixture is describedScientific Research Institute of Building Materials, 634003, Tomsk. Translated from Fizika Goreniya Vzryva, Vol. 30, No. 2, pp. 14–18, March–April, 1994.     

Theory of describing processes with phase transformations in spouted bed apparatus

The article presents the averaged equations of mass, momentum, and energy transfer for the zones of the ring and the core of spouted beds. An analytical relation for determining the diameter of the bed diameter is given.     

The Research of Jet Vortex Mills

ABSTRACT

The construction of two types of vortex mills was considered. In the first type, a gas is reduced tangentialiy through orifices in a cylindrical chamber wall. The coarse particles are loaded in the cylindrical rarefaction zone on the axis of the center orifice; in ihe second type, a gas-particle mixture is reduced by the pressure head device tangenlially through orifices in an internal cylindrical wall. The accelerated particles are ground by collisions with the external chamber wall in both cases. The mathematical modeling of gas-particle flow in these vortex chambers was executed. The numerical results showed that the first type of mill is suited for superfine grinding in the wide range of initial particle sizes (10 μm-lmm). While the second type of mill proved to he considerably more economical than the first type, the particles had to have initial sizes between 10-200 μm.     

The conditioning of the N100-P200 component of the human visual evoked potential by using biofeedback

Subjects were instructed to modify their N100-P200 component of VEP (in Cz recording) within selected time window. The aim was to increase the number of VEPs for which the amplitude of segment in question exceeded the definite threshold. The success in task performance suggests several modifications of the to-be-conditioned segment through different mechanisms. Of our 26 subjects, 14 were able to modify their VEPs according to the task demands. However, the latter subjects could be divided into 2 groups on the basis of the rate of increase in the number of correct responses under conditioning. Subjects which did not succeed in task performance could be also classed into 2 groups: one group with statistically negligible changes and the other decreasing the number of correct responses. ANOVA has shown significant distinctions in task performance for the groups with different levels of self-estimation of tiredness after experiment and different personal strategies. The success in task performance is likely to be dependent on the values of Eysenck questionnaire scales and topography of alpha activity.