Unit for determining the cross-sectional area of threads,fiber tows,and samples of unidirectional plastic material

An experimental unit for determining the cross-sectional area and stresses of unidirectional plastic materials is created. With the use of the unit, it is possible to precisely specify the physico-mechanical characteristics of composite materials before destruction.     

Plasma–Hydrogen Reduction of Waste Uranium Hexafluoride

A technological scheme for plasma–hydrogen reduction of ²³⁵U waste uranium hexafluoride, producing metallic uranium and water-free hydrogen fluoride, is proposed. The results of experimental investigations of the basic stages of this technological scheme are examined: production of U–F–H plasma flow and production and separation of uranium melt and water-free hydrogen fluoride. The level of plasma and high-frequency technology for implementing the plasma–hydrogen technology for converting waste UF₆ into metallic uranium and water-free HF is analyzed.     

Multi-fluid MHD model and calculations of Alfvén wave spectrum and dissipation in tokamaks

The numerical method is developed for calculations of wave excitation and dissipation in Alfvén and in Ion Cyclotron Range of Frequency (ICRF) in axisymmetric tokamaks. Multi-fluid magneto-hydrodynamic plasma model is used and two-dimensional inhomogeneity of plasma parameters with arbitrary cross section of magnetic surfaces is considered. The difference scheme for the wave equation is not connected to magnetic field geometry and is suitable for the method extensions to nonlinear and three-dimensional case. Special care is taken to avoid the spectrum distortion and pollution. Relevant benchmark cases are presented. Finally, the results of numerical calculations of Alfvén wave absorption are presented for the experimental conditions foreseen for the Tokamak Chauffage Alfvén wave experiment in Brazil (TCABR) [Nucl. Fusion 30 (1996) 503]. In particular, the effect of toroidal mode coupling on the power deposition of Global Alfvén Wave (GAW) eigenmodes is demonstrated.     

Efficient accomplishment of anastomosis in gastrointestinal operations

In experimental study (40 dogs) variant of precisional (microsurgical) suture and anastomosis was developed, which was successfully carried out in clinical practice in 72 patients with various diseases of gastro-intestinal tract. For precisional formation of gastro-intestinal and bowel anastomoses magnifying optics, atraumatic suturing material and microsurgical instruments were used. Separately were sutured by knot sutures gastric or bowel serosa (external layer) and musculosubcutaneos layer of these organs together with mucous membrane tangentially, without its penetrating puncture (internal layer). The developed precisional method of formation of the anastomoses promotes healing of gastro-intestinal wound by primary intention and may be recommended for wider practical application.     

Terahertz imaging system components based on PbSnTe: In films

This paper reports the results of experimental studies and calculations of components of a model system for detection and imaging in the terahertz range, including a free-electron laser and devices for laser radiation diagnostics, film shields with absorbing coatings for intermediate thermal imaging, and prototype sensitive elements based on PbSnTe: In films.     

Effectiveness of diet therapy in patients with ischemic heart disease and a history of myocardial infarction at young age]

To elucidate the effect of dietetics on the onset and course of coronary heart disease (CHD) patients who survived myocardial infarction at young age were investigated. The analysis of clinical and metabolic changes, psycho-vegetative disorders permitted the authors to distinguish two groups of patients: group 1--patients with normal body mass, and group 2--those with excessive body mass who received, respectively, A1 (basic) and Ar (reduced) variants of theanti- arteriosclerotic diet. It was established that the Ar diet produced positive effects on the dynamics of body mass reduction, on the cardiovascular system, on parameters of lipid metabolism, hemostasis and psycho-physiologic parameters of group 2 patients. Diet therapy combined with tranquilizers is recommended for group 1 patients.     

Simulation of thermally stressed state and evaluation of the fire-resistance limit for a wall of “Besser” concrete blocks

We carry out a numerical investigation of the thermally stressed state and make a theoretical evaluation of the fire-resistance limit for a wall of vibrocompressed concrete blocks. We perform calculations on the basis of the method of finite elements. Different variants of thermal loading under ordinary fire conditions are considered. Conclusions are drawn concerning the possibility of using blocks for constructing three-layered walls. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 70, No. 3, pp. 480–486, May–June, 1997.     

Broaching-Mill selection

Screw broaching in different technological systems is considered, with the use of linear guides and guide disks. Broaching in barrel-shaped rollers proves preferable. The effectiveness of guide disks and linear guides is compared, and the use of idling disks is recommended in broaching thick-walled sleeves.