Communication of clients with the server passes through a wireless point of WiFi access. The attacking device is the laptop that has the software package of CommView for WiFi. The analysis of ...stability program by automatic telephone exchange on the basis of Asterisk NOW from unauthorized access to a telecommunication network is provided in this article. The software product on the basis of Asterisk NOW uses as the server. As softfon and client base laptops, computers, and gadgets on which passes test are considered. Communication of clients with the server passes through a wireless point of WiFi access. The attacking device is the laptop on which the software package of CommView for WiFi is established. By the result of carried out test the analysis of network's vulnerability was made. Recommendations about a measure of protection from unauthorized access are made. The optimum option of network protection is offered.
We propose asymptotic wave-like approximations for the accurate modeling of dielectric lenses used in quasi-optical systems of millimeter, submillimeter, and infrared wave applications. For the ...comparison, we obtain an exact full-wave solution of two-dimensional focusing lens problem and use it as a benchmark for testing and validation of asymptotic models being proposed.
The article describes the efficiency of solar modules in Europe, the comparative analysis of various alternative energy sources. The article details the solar power system on the basis of bilateral ...modules with the hydrogen generation system and its working principle and efficiency in various modes. The comparison of the performance of the proposed solar power systems on the basis of bilateral modules and a traditional solar power is presented.
We calculate the elastic energy of a heterostructure consisting of materials with different elastic moduli. In the framework of the continuous theory of elasticity we obtain an analytical solution ...for the elastic field of a periodic arrangement of screw misfit dislocations. This solution allows to calculate the critical thickness of the epitaxial layer (epilayer) and to analyse its dependence on the elastic contrast between the substrate and the epilayer. Analysis of the total elastic energy of the heterostructure shows that a transition from a pseudomorphic state to a state with misfit dislocations occurs similarly to either a first-order or a second-order phase transition. The type of transition that the system follows depends on the relation between the elastic moduli of the substrate and the epilayer.
For mechanical engineering and other branches of industry the most progressive and economic technological processes permitting to increase wear resistance, corrosion resistance and other properties ...of the working surface of the produced machines are technological processes of gas-thermal coating evaporation. In the paper there is considered the scheme of gas-thermal coating evaporation and selected the optimum technological modes of gasthermal evaporation. There is developed a mathematical model defining relations between the evaporation distance, the angle of the melted particles dispersion, the speed of the part rotation, the speed of the burner movement and the evaporated coating thickness.
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