Springer Science and Business Media LLC

A solution is obtained for the problem of the stretching of an anomalously viscous film under nonisothermal conditions. The solution is analyzed.

The feasibility is established here of analyzing and describing the sinter treatment of ceramics by solving the differential equations of heat and mass transfer on the basis of nonequilibrium thermodynamics.

Nghiên cứu giải phương trình khí động học với việc tính đến sự truyền nhiệt trong quá trình thỏa mãn của dòng nhiệt được phân tích. Các mối quan hệ biểu diễn các định luật bảo toàn trên mặt phẳng đứt gãy mạnh của các đại lượng tìm kiếm, bao gồm sự đứt gãy của nhiệt độ và mật độ dòng nhiệt, được thảo luận. Khả năng tồn tại của hai sóng sốc với dữ liệu ban đầu cố định được chỉ ra bằng cách sử dụng giải pháp tự tương tự của bài toán về chuyển động khí phía trước pít-tông. Sự xuất hiện của hai đứt gãy mạnh là do sự hiện diện của tốc độ lan truyền khác nhau của các rối loạn khí động và nhiệt — tốc độ âm thanh và tỷ lệ truyền nhiệt hữu hạn tại thời điểm thỏa mãn dòng nhiệt khác không.

A thermodynamic analysis has been performed using a universal TERRA program. The analysis has made it possible to identify the optimum parameters of the process of plasma chemical conversion of spent lubricants for various gasifying agents (air and water vapor). Based on the calculations, a closed-cycle scheme has been proposed for their integrated plasma chemical treatment, the scheme being a wasteless method of waste conversion. This method makes it possible to simultaneously obtain synthesis gas suitable for the production of methanol and electricity and isolate precious nonferrous and rare metals with minimal environment impact.

Creep processes associated with the uniaxial compression of rubber samples are studied in relation to the applied load and preliminary stressing. It is found that the delay time is influenced by the degree of compression.

In the paper, consideration is given to possible methods of heat removal from water pools and storages of spent nuclear fuel of atomic power plants, which can be employed in an emergency due to failure of the regular cooling system of the pool. The authors present results of investigation of two passive methods of emergency cooling of spentfuel water pools: the first method is to use emergency accumulator reservoirs with a cooling-water supply, and the second, to use boiling channels whose action is based on the effect of creating driving head in the emergency system of natural circulation of the cooling pond of the coolant.

A physicomathematical model of heat and moisture transfer in drying materials in the region below the hygroscopicity limit, including also the heating by the energy of a microwave field, has been developed. The developed system of equations has been solved numerically for three cases of drying of a wooden plate: convective drying, drying by the microfield-field energy, and drying combining the above two methods, i.e., combined drying. Results of numerical calculations of the temperature, vapor-pressure, and moisture-content distributions in the cross section of the plate at different instants of time, and also of the change in the average moisture content and temperature in the process of drying, have been presented. The calculation results have been analyzed; conclusions on the differences and distinctive features of convective, microwave, and combined heating and drying have been drawn.

A theoretical foundation is given to the methodology for measuring the thermo-physical properties of substances and the applicability of the temperature wave method here is analyzed. On the basis of an examination of a two-dimensional heat conduction problem for a disc specimen and a circular modulated thermal flux, the influence of heat transfer on different specimen surfaces is investigated on the temperature wave parameters therein.