Optimization of Lift-Curve Slope for Wing-Fuselage Combination

The paper presents results obtained by the author for wing-body interference. The lift-curve slopes of the wing-body combinations are considered. A 2D potential model for cross-flow around the fuselage and a discrete vortex method (DVM) are used. Flat wings of various forms and the circular and elliptical cross sections of the fuselage are considered. It was found that the value of the lift-curve slopes of the wing-body combinations may exceed the same value for an isolated wing. An experimental and theoretical data obtained by other authors earlier confirm this result. Investigations to optimize the wing-body combination were carried within the framework of the proposed model. It was revealed that the maximums of the lift-curve slopes for the optimal midwing configuration with elliptical cross-section body had a sufficiently large relative width (more than 30% of the span wing). The advantage of the wing-fuselage combination with a circular cross section over an isolated wing for wing aspect ratio greater than 6 can reach 7.5% at the relative diameter of fuselage equal to approximately 0.2

On a Multiple-Access in a Vector Disjunctive Channel

We address the problem of increasing the sum rate in a multiple-access system from [1] for small number of users. We suggest an improved signal-code construction in which in case of a small number of users we give more resources to them. For the resulting multiple-access system a lower bound on the relative sum rate is derived. It is shown to be very close to the maximal value of relative sum rate in [1] even for small number of users. The bound is obtained for the case of decoding by exhaustive search. We also suggest reduced-complexity decoding and compare the maximal number of users in this case and in case of decoding by exhaustive search.Comment: 5 pages, 4 figures, submitted to IEEE ISIT 201

Regional differentiation in the Russian federation: A cluster-based typification

The paper gives a socio-economic analysis of the 89 regions of the Russian Federation. This analysis is implemented in four steps: 1) elaboration of a set of indicators defining the socio-economic situation in all 89 regions of the Russian Federation plus procedures to replace groups of correlated indicators with single estimated (synthetic) targets 2) preparation of the procedure for regions' ordering within multidimensional space (regions' ranking) in relation to the statement base year 1992 and within year-to-year series (1993,1994) 3)clustering of all Russian Federation regions according to their principal types and drawing on the regional typification and providing a rationale for the sorting out of backward and prosperous regions, those in depression and those considered to be border areas 4)description of the problem character of the specific types. The resulting typification . provides a methodological and procedural basis for monitoring the socio-economic situation in the regions of the Russian Federation . can be helpful in preparing scientific foundations of a comprehensive trageted government program . presents an element for further studies on reguonal development in the Russian Federation.

Critical Mach Numbers of Flow around Two-Dimensional and Axisymmetric Bodies

The paper presents the calculated results obtained by the author for critical Mach numbers of the flow around two-dimensional and axisymmetric bodies. Although the previously proposed method was applied by the author for two media, air and water, this chapter is devoted only to air. The main goal of the work is to show the high accuracy of the method. For this purpose, the work presents numerous comparisons with the data of other authors. This method showed acceptable accuracy in comparison with the Dorodnitsyn method of integral relations and other methods. In the method under consideration, the parameters of the compressible flow are calculated from the parameters of the flow of an incompressible fluid up to the Mach number of the incoming flow equal to the critical Mach number. This method does not depend on the means determination parameters of the incompressible flow. The calculation in software Flow Simulation was shown that the viscosity factor does not affect the value critical Mach number. It was found that with an increase in the relative thickness of the body, the value of the critical Mach number decreases. It was also found that the value of the critical Mach number for the two-dimensional case is always less than for the axisymmetric case for bodies with the same cross-section

Geopolitical and Economic Aspects of Development of the Independent States of the Eurasian Region in the Context of the Eurasian Integration (1991-2013)

This article is devoted to the study of the process of solution by the Eurasian countries of the systemic crisis, caused by the collapse of the Soviet Union, in the context of processes of Eurasian integration

The Role of International Political Institutions in the Integration Processes in the Eurasian Region

The article is devoted to studying the role of international political institutions in the integration processes of the Eurasian region. The author examines the Collective Security Treaty Organization, the Shanghai Cooperation Organization and the Organization for Democracy and Economic Development. The problem of duplication of integration associations of the Eurasian region is noted in the article. Also the author makes the conclusion that the experience of the Eurasian region in the sphere of military-political cooperation should be used in the process of formation of individual structures of the future Eurasian Union

Simulation model of load balancing in distributed computing systems

The availability of high-performance computing, high speed data transfer over the network and widespread of software for the design and pre-production in mechanical engineering have led to the fact that at the present time the large industrial enterprises and small engineering companies implement complex computer systems for efficient solutions of production and management tasks. Such computer systems are generally built on the basis of distributed heterogeneous computer systems. The analytical problems solved by such systems are the key models of research, but the system-wide problems of efficient distribution (balancing) of the computational load and accommodation input, intermediate and output databases are no less important. The main tasks of this balancing system are load and condition monitoring of compute nodes, and the selection of a node for transition of the user's request in accordance with a predetermined algorithm. The load balancing is one of the most used methods of increasing productivity of distributed computing systems through the optimal allocation of tasks between the computer system nodes. Therefore, the development of methods and algorithms for computing optimal scheduling in a distributed system, dynamically changing its infrastructure, is an important task