Синтез систем обеспечения тепловых режимов радиоэлектронной аппаратуры
The scientific significance of the scientific results outlined in the work is to investigate the mechanisms of formation of contact radio interference that arise as a result of the electromagnetic field of radio transmitters located on aircrafts on current-carrying mechanical contacts of structures with nonlinear and time-varying resistances, as well as the formation of electromagnetic interference. The scientific results obtained as a result of the studies showed the mechanisms of formation of a flowing current caused by induced EMF, along the elements of the airplane structure, which lead to the formation of a radiation mechanism by these elements of the secondary electromagnetic field interacting with the primary irradiating electromagnetic field of the radio transmitter. By registering and analyzing the spectral composition of the electromagnetic radiation of mechanically connected elements of the ES structure, it is possible to control the quality of assembly of the structural elements. Carrying out complex diagnostics based on measuring the spectral composition of the whole product, having the measuring antennas around the product under investigation it is possible to conduct reliable estimates of the quality of assembly of both individual mechanical elements and the entire ES design as a whole. The studies carried out in the work can be put into the development and study of a contactless express method for assessing the quality of assembly and installation of structures. The method is based on the registration and analysis of artificially generated contact jamming under the influence of mechanical vibrations and a high-frequency harmonic electrical signal on the elements of aircraft structures forming a phase-amplitude-modulated oscillation circuit, which are recorded by a spectrum analyzer or a FAM receiver or AM oscillations. In this case, the levels of its spectral components are measured with a change in the frequency of mechanical influences in the range determined by the operating conditions. The measured level of the spectral components of the emitted amplitude-modulated oscillations is compared with the level of the spectral components of the signal emitted by the design of the reference block with given mechanical parameters and having a standardized level of contact interference. The main result of these studies allows us to use the considered in the field of electromagnetic compatibility (EMC) as an undesirable phenomenon, the formation of contact jammers has been used successfully to evaluate the mechanical properties of structures (assessing the quality of their assembly) of a wide variety of aircraft technical devices and devices, including the quality of assembly and installation related to the tightening torque of fasteners).
3D chip stacking technology is now an available option to increase the effective performance of functional modules. Several attempts were made to model the temperature distribution in multichip module packages using universal 3D simulators ABAQUS, FloTHERM, ANSYS, and others. However fully 3D CFD and/or FEA models have some lacks for practical engineers: 1) complex I/O data description; 2) unacceptable CPU time. Quasi-3D approach is an efficient means to obtain an accurate solution with acceptable CPU time. In this work a quasi-3D approach which was previously used for different types of BGA packages is adapted to the new 3D IC-TSV-BGA package constructions.
This paper describes the experience of the application of the design approach which is used in the HSE - Nizhny Novgorod in the teaching of accounting (financial) accounting, auditing, economic analysis. The stages of a complex project, as benefits of this approach and the problems that arise.
New trends, technologies and symbols of the "Design and advertisement 2013" exhibition with illustrated examples are described in the article.
This volume contains a collection of papers based on lectures and presentations delivered at the International Conference on Constructive Nonsmooth Analysis (CNSA) held in St. Petersburg (Russia) from June 18-23, 2012. This conference was organized to mark the 50th anniversary of the birth of nonsmooth analysis and nondifferentiable optimization and was dedicated to J.-J. Moreau and the late B.N. Pshenichnyi, A.M. Rubinov, and N.Z. Shor, whose contributions to NSA and NDO remain invaluable.
The first four chapters of the book are devoted to the theory of nonsmooth analysis. Chapters 5-8 contain new results in nonsmooth mechanics and calculus of variations. Chapters 9-13 are related to nondifferentiable optimization, and the volume concludes with four chapters containing interesting and important historical chapters, including tributes to three giants of nonsmooth analysis, convexity, and optimization: Alexandr Alexandrov, Leonid Kantorovich, and Alex Rubinov. The last chapter provides an overview and important snapshots of the 50-year history of convex analysis and optimization.
Brazil and Germany have a "shared history" or shared stories that refer not only to the similarities and differences between the two countries, but also to cultural approaches between them despite the socio-cultural differences and geographical distance. Accordingly, the contributions in this volume highlight the German Brazilian relations in design, film, literature, and media. At the same time they discuss motivations, connections, comparisons and inspirations of these relations.
This essay presents taxonomy for analyzing objects in films and applies it to the work of Canadian filmmaker, Denys Arcand. This kind of analysis aims to identify and analyze how the most representative daily objects are used in films. The following three films were analyzed for the purposes of this paper: Le déclin de l´empire américain (The Decline of the American Empire, 1986), Les invasions barbares (The Barbarian Invasions, 2003) and L’âge des ténèbres (Days of Darkness, 2007). This research was developed at Concordia University, Montreal, Canada and supported by the Foreign Affairs and International Trade, Canada (DFAIT).
Most of the existing books on optimization focus on the problem of computing locally optimal solutions. Global optimization is concerned with the computation and characterization of global optima of nonlinear functions. Global optimization problems are widespread in the mathematical modeling of real world systems for a very broad range of applications. During the past three decades many new theoretical, algorithmic, and computational contributions have helped to solve globally multi-extreme problems arising from important practical applications. Introduction to Global Optimization is the first comprehensive textbook that covers the fundamentals in global optimization. The second edition includes algorithms, applications, and complexity results for quadratic programming, concave minimization, DC and Lipshitz problems, decomposition algorithms for nonconvex optimization, and nonlinear network flow problems. Each chapter contains illustrative examples and ends with carefully selected exercises, which are designed to help the student to get a grasp of the material and enhance their knowledge of global optimization methods. Audience: This textbook is addressed not only to students of mathematical programming, but to all scientists in various disciplines who need global optimization methods to model and solve problems.
The problem of electromagnetic compatibility in the design of electronic equipment. Emphasizes the importance of improving training in the design of equipment.