The article describes the computational model that unites the formalization of ecological features of the reproductive cycle of anadromous fish and the possibility of studying nonlinear effects in the population dynamics under anthropogenic impact. Event-driven component implemented in continuous time has allowed us to take into account changes in the survival generation in interrelation with the factors of growth rate. Discrete component trajectory of the dynamical system has two areas of attraction and is characterized by the reverse tangent bifurcation due to the impact of fishing, which dramatically transforms the population with the condition of irregular fluctuations in low numbers. The further emergence of «boundary crisis» for the interval attractor describes a common scenario an irreversible degradation of biological resources.

In this article, methods of solving the contact problem based on Mooney Rivlin model including material nonlinearities are considered in the context of the manipulator finger reacting with the capture part. The results of multiobjective optimization of the construction are presented.

In recent years there has been a growing attention towards the use of renewable energy sources. Among them solar energy is one of the most promising green energy resources due to its environment sustainability and inexhaustibility. However photovoltaic systems (PhV) suffer from big cost of equipment and low efficiency. Moreover, the solar cell V-I characteristic is nonlinear and varies with irradiation and temperature. In general, there is a unique point of PhV operation, called the Maximum Power Point (MPP), in which the PV system operates with maximum efficiency and produces its maximum output power. The location of the MPP is not known in advance, but can be located, either through calculation models or by search algorithms. Therefore MPPT techniques are important to maintain the PV array’s high efficiency. Many different techniques for MPPT are discussed. This review paper hopefully will serve as a convenient tool for future work in PhV power conversion.

The cascade control is developed for the case of plant parameters uncertainty. The two loops system is considered with proportionalintegrate (PI) controllers, such the parametric synthesis can be generalized for multi loops systems. The necessary quality of the system is achieved by the correct polynomial’s roots location on a complex plane. The roots location is defined to achieve the low sensitivity of the system to plant’s parameters variations. The multiples numerical examples are presented for developed method, which demonstrate the belonging of polynomials roots to the restricted area of left hand half of complex plane for various multi loops systems.

The method of calculation the thermal field and the thermal resistance of fragments of building envelope and developed computer calculating program are described in the article «Calculation of the thermal field and the thermal resistance of buildings envelopes using the finite element method». The main logical modules of the program are described. An example of calculation of temperature field and of the thermal resistance of element of monolithic frame building is given.

Computed tomography is still being intensively studied and widely used to solve a number of industrial and medical applications. The algebraic reconstruction method with simultaneous iterations SART considered in this work as one of the most promising of iterative methods, suitable for the tomographic problems. Graphics processor is used to accelerate the speed of the reconstruction. The method of minimizing the total variation (TV) is used as a priori support for the regularization of the iterative process and to overcome the incompleteness of the information.

In work the problem of design-technology preparation of production of hydraulic actuators is staticized. The structure and business processes of design and production are analysed. Methods and means of reorganization of project works for the purpose of cutting-down of time of preparation of production are offered. The directions of reorganization of process of design are formulated. The principle of carrying out procedures of design-technology preparation of production of hydraulic actuators with use of ready elements of a production cycle is considered. The scheme of their practical realization at machine-building enterprise is offered. The assessment of growth of efficiency of design-technology preparation of production is given in machine-building enterprise.

The objective of this study is to develop a model rizograficheskoy based printing functions package IPT and automated profile selection rizograficheskoy printing. Work risograph for halftone printing consists of two stages – production of screen form (master film) and printing. The master film is supplied and installed in the printing machine in the form of rolls of different sizes, depending on the print size and model of the device. The capacity of the roll is measured in squares – segments of the printing material. Master-film for risograph consists of three layers: a solid but porous layer such as a paper web neprokleennogo and without fillers; an adhesive layer bonding the paper web to the upper layer; upper, thin polymer layer.

In this paper we assessed the sustainability of the encryption algorithm based on dynamic chaos, as well as the basic principles for the implementation of linear and differential cryptanalysis.