Structural behaviour of pneumatic cushions

Pneumatic air-inflated cushions are considered. The iteration technique for obtaining equilibrium pressure in their chambers is offered. It is based on the Broyden's method and uses the proposed function of cushion’s surface and the differential equation of equilibrium. The technique for obtaining the maximum load, which may be applied on a cushion, is proposed. The research of the influence of temperature variations on the behavior of pneumatic cushions is executed

Some features of the fabrication of multilayer fiber composites by explosive welding

The fabrication of multilayer fiber composites by explosive welding is characterized by intense plastic deformation of the matrix material as it fills the spaces between fibers and by high velocity of the collision between matrix layers due to acceleration in the channels between fibers. The plastic deformation of the matrix layers and fiber-matrix friction provide mechanical and thermal activation of the contact surfaces, which contributes to the formation of a bond. An important feature of the process is that the fiber-matrix adhesion strength can be varied over a wide range by varying the parameters of impulsive loading

METHODOLOGICAL APPROACHES TO DEVELOPMENT REGIONAL INTERACTION CENTER «GOVERNMENT-BUSINESS-SCIENCE» IN THE CONTEXT OF «TRIPLE HELIX» MODEL

The article describes the interaction mechanisms of external forms and methods of partnership of science/education, business and government in the context of «triple helix» model. The author suggests a project to development regional research and education interaction center «government-business-science»

METHODOLOGICAL APPROACHES TO DEVELOPMENT REGIONAL INTERACTION CENTER «GOVERNMENT-BUSINESS-SCIENCE» IN THE CONTEXT OF «TRIPLE HELIX» MODEL

The article describes the interaction mechanisms of external forms and methods of partnership of science/education, business and government in the context of «triple helix» model. The author suggests a project to development regional research and education interaction center «government-business-science»

Activity of the right cardiac ventricle and metabolism in healthy persons during an orthostatic test after short term immobilization

A 15 minute orthostatic test was performed on healthy male volunteers under conditions of catheterization of the right ventricle of the heart and the radial (or brachial) artery before and after 5 day bedrest in an antiorthostatic position of the body (with the foot of the bed raised 4.5 degrees). The change to a vertical position after immobilization was attended by a more marked increase in the rate of cardiac contractions, an increase of max dp/dt pressure in the right ventricle, and a decrease of cardiac and stroke indices. The decrease of the cardiac index was compensated for, to a certain measure, by a further increase in the extraction and utilization of O2 by the tissues. The arterial blood pH did not change essentially, while the decrease in pCO2 and content of standard bicarbonate was more marked