Weak Wave Turbulence Scaling Theory for Diffusion and Relative Diffusion in Turbulent Surface Waves

We examine the applicability of the weak wave turbulence theory in explaining experimental scaling results obtained for the diffusion and relative diffusion of particles moving on turbulent surface waves. For capillary waves our theoretical results are shown to be in good agreement with experimental results, where a distinct crossover in diffusive behavior is observed at the driving frequency. For gravity waves our results are discussed in the light of ocean wave studies.Comment: 5 pages; for related work visit http://www.imedea.uib.es/~victo

Simulation of heat transfer under conditions of free motion around a horizontal tube

В работе рассматриваются вопросы численного моделирования теплоотдачи от поверхности горизонтальной трубы в условиях свободной конвекции в неограниченном объеме. Результаты моделирования представлены в сопоставлении с данными теоретического расчета.The paper deals with the issues of numerical simulation of heat transfer from the surface of the horizontal tube under conditions of free convection in the unbounded space. The simulation results are presented in comparison with the theoretical calculations

Preparatory stage in the solution of the optimization problem of heat exchange intensification in a tube beam

The influence of the model parameters on the heat transfer processes in transverse flow past a single pipe in convection types is analyzed. Based on the results of the experiments, the optimal mesh model was chosen.В работе исследуется влияние параметров модели на процесс теплообмена при поперечном обтекании одиночной трубы в условиях свободной конвекции. По результатам расчетов была выбрана оптимальная сеточная модель

The flows structure in unsteady gas flow in pipes with different cross-sections

The results of numerical simulation and experimental study of the structure of unsteady flows in pipes with different cross sections are presented in the article. It is shown that the unsteady gas flow in a circular pipe is axisymmetric without secondary currents. Steady vortex structures (secondary flows) are observed in pipes with cross sections in the form of a square and an equilateral triangle. It was found that these secondary flows have a significant impact on gas flows in pipes of complex configuration. On the basis of experimental researches it is established that the strong oscillatory phenomena exist in the inlet pipe of the piston engine arising after the closing of the intake valve. The placement of the profiled plots (with a cross section of a square or an equilateral triangle) in the intake pipe leads to the damping of the oscillatory phenomena and a more rapid stabilization of pulsating flow. This is due to the stabilizing effect of the vortex structures formed in the corners of this configuration. © The authors, published by EDP Sciences, 2017.Thus, in this study it was found that the cross-sectional shape of the pipe has a significant impact on the structure of the gas flow. The secondary flows (steady vortex structures) are formed in pipes with cross sections in the form of a square and an equilateral triangle. Secondary flows (steady vortex structures) in the pipe can stabilize the pulsing flows. This phenomenon can be used in the design of the intake and exhaust systems of energy machines and plants with a view to their gas-dynamic improvement. The work has been supported by the Russian Science Foundation (grant No. 17 -69-00002)

Subátomos de hidrógeno y fotosíntesis en plantas con un campo magnético.

The presence of hydrogen atoms in their subatomic states may be predicted if one accounts for the intrinsic energy of quantum movement of an electron in a proton-electron system. For this reason, a series of experiments whose purpose was to prove the presence of hydrogen subatoms was carried out. The formation of bound subatomic states of hydrogen is characterized by an observable ultraviolet radiation with a wavelength in the 206-nm region. Such radiation has been observed during photosynthesis in certain houseplants. The presence of a weak magnetic field is shown to selectively amplify this radiation.La presencia de átomos de hidrógeno en sus estados subatómicos se puede predecir si se tiene en cuenta la energía intrínseca del movimiento cuántico de un electrón en un sistema protón-electrón. Por este motivo, se llevaron a cabo una serie de experimentos cuyo propósito fue probar la presencia de subátomos de hidrógeno. La formación de estados subatómicos de hidrógeno unidos se caracteriza por una radiación ultravioleta observable con una longitud de onda en la región de 206 nm. Dicha radiación se ha observado durante la fotosíntesis en ciertas plantas de interior. La presencia de un campo magnético débil se muestra para amplificar selectivamente esta radiación.&nbsp

Resilient self-debugging software protection

Debuggers are a popular reverse engineering and tampering tool. Self-debugging is an effective technique for applications to defend themselves against hostile debuggers. In penetration tests on state-of-the-art self-debugging, we observed several opportunities through which it could be attacked, however. We therefore improved upon the existing technique, making it more resilient by introducing reciprocal debugging and making the transfers of control between protected application and self-debugger more stealthy. This paper presents the improved self-debugging design, and details our research efforts into realizing reciprocal debugging. In our evaluation we show that the improved design is significantly harder for attackers to defeat

The flows structure in unsteady gas flow in pipes with different cross-sections

The results of numerical simulation and experimental study of the structure of unsteady flows in pipes with different cross sections are presented in the article. It is shown that the unsteady gas flow in a circular pipe is axisymmetric without secondary currents. Steady vortex structures (secondary flows) are observed in pipes with cross sections in the form of a square and an equilateral triangle. It was found that these secondary flows have a significant impact on gas flows in pipes of complex configuration. On the basis of experimental researches it is established that the strong oscillatory phenomena exist in the inlet pipe of the piston engine arising after the closing of the intake valve. The placement of the profiled plots (with a cross section of a square or an equilateral triangle) in the intake pipe leads to the damping of the oscillatory phenomena and a more rapid stabilization of pulsating flow. This is due to the stabilizing effect of the vortex structures formed in the corners of this configuration

Peculiarities of general cultural and political values transformation in Russia

The relevance of the study is due to the fact that over the past thirty years Russian state cultural policy has been focused on strengthening democratic cultural values, but in recent years the situation has begun to change dramatically. The ruling elite of the country announced the state cultural policy reorientation, which should now be based exclusively on traditional values. The purpose of the study is to identify features of the general cultural and political values system transformation in Russia. The objectives of the article are to identify current general cultural and political values that fall under the category of “traditional”, to establish value orientations that are most significant for Russians at present, and to determine degree of risk of a value split in Russian society. The research was conducted using such methods as classical document analysis, social survey, comparative analysis, systematization, and visualization methods. The results of the study show that the values accepted as traditional and the values identified by respondents as significant coincide in such positions as justice, human rights, freedom, patriotism, morality, collectivism, and mutual aid. No immediate threat of degradation of Russian society’s values has been identified. The risks associated with a possible split in society are moderate. The results of the sociological study allow us to conclude that the political views of one part of the Russian society are polarized, but the level of apolitical attitude of the other part is increasing