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Физика Физика
Механика. Динамика Механика. Динамика


The fundamental structural mechanics of elastic systems: Oscillations and flutter

Автор:   Leschenko A.P.
мягкая обложка
224 страниц
2006 год
Издательство:   Ленанд
477 руб
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Описание:All these result in a considerable saving of materials, which is accompanied by improving the safety of constructions. On the other hand, the new method has allowed for an adequate model of stress-and-strain state of constructions to be developed, which, for the first time ever, has made it possible to predict with a high accuracy the moment of structural failure. This new method is based on the following three discoveries made by the author: - Phenomenon of separating torsional strains of elastic bars; - Specific law of analogy in stability and oscillation of elastic systems; - Principle of force factors pairing in structural mechanics. Leschenko has developed a graphical scheme (the so-called triad) for an analysis of elastic systems. All actual approaches and theories of structural mechanics widely employ such an abstract concept as generalized force, neglecting, however, a definite and practical concept of external force factor. In author' s opinion, this breaks the interrelations between the external and internal forces acting on structures and the strains occurring in the structures, which leads to an implicit violation of the classical mechanics laws, namely the law of energy conservation, the Lagrange principle, and Newton' s laws. It should be stressed that Leschenko does not suggest that one concept should be simply replaced by the other, but interrelates the external action with other forces and factors concurrently acting on the structure. As main advantages of the new method we can list comparatively quick calculations of all types of structures, the examination and verification of design solutions, and the detection of critical loads and weak points of constructions. Thus, the author has proposed to consider any elastic system as based on three permanently acting factors: 1. external forces; 2. internal forces; and 3. elastic strains; and indicated the principles linking the effects of these factors. The triad analysis of elastic systems has enabled to reveal great contradictions in the available structural calculations of plates, shells and bars. A. P. Leschenko has offered a completely new approach to structural mechanics, which allowed for a unique technique for structural engineering to be developed.

Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка

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Thinking In C++. Volume 2: Practical Programming

But for multithreading to work, you need some way to prevent two threads from accessing the same resource, at least during critical periods. Preventing this kind of collision is simply a matter of putting a lock on a resource when one thread is using it. The first thread that accesses a resource locks it, and then the other threads cannot access that resource until it is unlocked, at which time another thread locks and uses it, and so on. If the front seat of the car is the limited resource, the child who shouts "Dibs!" acquires the lock. Thus, we need to be able to prevent any other tasks from accessing the storage when that storage is not in a proper state. That is, we need to have a mechanism that excludes a second task from accessing the storage when a first task is already using it. This idea is fundamental to all multithreading systems and is called mutual exclusion; the mechanism used abbreviates this to mutex. The ZThread library contains a mutex mechanism declared in the header Mutex.h. To solve the problem in the above program, we identify the critical sections in which mutual exclusion must apply; then we acquire the mutex before entering the critical section and release it at the end of the critical section ...»

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