The article is devoted to the resistance accounts composite structures. It is based on all-covariance-energy principle. We consider the calculation of the stress-strain state of construction, consisting of a base in the form of hexagonal plates, rigid base related to the circular cylindrical shell.
Keywords: plate, shell, variation-energy principle, the strength, the composite structure.
Present the method for determining the optimal plan wood harvesting and hauling on logging enterprise. The method is recommended for use in enterprises applying cut-to-length logging. Optimization criterion is the minimum cost of harvesting and hauling wood. The method use will reduce costs and increase profitability for enterprise.
Keywords: logging area, base of forest resources, natural factors of production, primary wood transport, network transportation, costs
Seed damage has a negative impact on the subsequent development of the plant, its yield, and generally on the economic efficiency of grain production. Main percentage of the grains injury occurs in the post-harvest processes, particularly in the grain cleaning. One way of solving this aim is reducing of macro and micro damage of seeds by using of the new polymeric materials. Researches have been conducted to reduce the micro and macro of injury barley seeds (feed material) through the use of new sieves made of polymeric materials UHMW PE for agricultural machinery.
Keywords: polymeric materials, micro and macro damage, reducing injury of the seeds
The article is devoted to the resistance accounts composite structures. The basis of the position of women variational energy principle. Considered potential energy flanging to calculate the stress-strain state of construction, consisting of a base of the form of hexagonal plates, rigidly connected to the base of circular cylindrical shells, the upper end of which is enhanced by the hexagonal crimping.
Keywords: plate, shell, variation-energy principle, the strength, the composite structure
The way of а compиter assessment of qиality of the mix consisting of two and more components is stated. The algorithm for definition of factor of иniformity of mixing is based оп а clиstering of K-averages and realized in an applied Matlab package with иse of the graphic GUI interface. Check of this way proved possibility of its иse for an assessment of qиality of а miх.
Keywords: quality of а mix, uniformity of mixing, components, cluster
The article is devoted to the resistance accounts composite structures. We consider the output resolution of the system of equations for determining the stress-strain state of construction, consisting of a base in the form of hexagonal plates, rigidly connected to the base of a circular cylindrical shell.
Keywords: plate, shell, the strength, the composite structure.
Digital compact proton magnetometer was created for measure the geomagnetic fields, including the fields of high heterogeneity. We described design of the instrument and its principles of operation. This device is using implemented digital filtering techniques and Prony method to determine the frequency of the desired signal. The experiments were made in the fields of high heterogeneity and demonstrated the possibility of precise measurements in the fields with a gradient of up to 8 mT / m. The device can be used as a metal detector, as well as for magnetic prospecting, geological studies, etc.
Keywords: nuclear magnetic resonance, free precession, proton magnetometer, geomagnetic field, digital filtering, Prony method
The article is devoted to the resistance accounts composite structures. Examine the work of the external forces acting on the structure, consisting of a base in the form of hexagonal plates, rigidly connected to the base of a circular cylindrical shell.
Keywords: plate, shell, the strength, the composite structure.
Circuit features of the electronics module for avalanche photodiode signal read-out, created on a basis of the specialized analog IC, are considered. Measurement re-sults of characteristics and noise depending on signal source capacity are given.
Keywords: avalanche photo diode, readout electronic, charge sensitive amplifier, shaper, electronics module
The article is dedicated to increasing the strength properties of building structures based on bionic principles. Used research on modeling of plant materials. The different types of window openings. The recommendations to improve the strength of the restoration works for the construction of openings.
Keywords: shell, strength, mesh structure
Bbiomechanical parameters of the competitive exercise «bench» during the All-Russian competitions (Cup of Russia, Sochi 2011) were revealed in powerlifting athletes of various qualifications with motor disorder. Comparative analysis showed that there are significant differences between athletes of high, medium and low skills.
Keywords: Powerlifting, sports techniques, sportsmen of different qualifications with motor disorder
The article is devoted to the modeling of plant material and to increase the strength properties of building structures using bionic principles. The different kinds of structures reinforcing fabric leafy plants. Recommendations on the use of reinforcement cages during restoration work in construction.
Keywords: shell strength, plant, reinforcing fabric, building construction
A design of the actuator, consisting of a thin layers of silicon dioxide and aluminum is proposed. There are calculations made of the response speed and heat dissipation of the actuator. By making the best selection of layer thicknesses and optimization stages of technological process, in particular the deep selective etching of silicon, the best performance on the angle of inclination of the actuator and the speed of the device could be achived. The greater the difference between the initial temperature and the heating temperature, the stronger the beam of the actuator is lowered to the plane of the silicon plate, and, therefore, less angle of elevation above the surface of the silicon plate. It is thus possible to control the angle of the beam by selecting the appropriate heater and voltage, providing the desired temperature. The design of the micromirror device based on the proposed actuator is provided. The developed design is based on the actuator and allows for controling the tilt of the mirror in a wide range.
Keywords: silicon, termoactuator, micromechanical systems, bimorph structure, micromirrors
There is the information of the use of belt electrostatic grain cleaner for the pre-sowing seed treatment with the purpose of their disinfection in this artcicle. The results of the treatment of seed mixture in electric field at the different variants of work conditions are presented. The specific expenditure of electric power on the percent of seed mixture disinfection was calculated.
Keywords: electric method, pre-sowing treatment, disinfection, electric field, belt electrostatic grain cleaner
In this paper we evaluate the viability of cell suspensions with the assessment of their bioelectric properties. A method for evaluation of cell suspensions, based on the method of pulse impedance. The frequency response of the electric impedance of suspensions chondroblasts, determined by analysis of the transition function. Under the transition function is meant to test the reaction of the object exposure, for which current is used as a reaction - voltage electrodes placed in the sample suspension. After the time-frequency transform data to a PC, the transfer function is considered in the space of states that characterize the electrical properties of multicomponent biological tissues, which allows us to go to the electrical equivalents of its constituents. The measurement process, i.e. impact on the sample cell suspension is carried out within the pulse of electric current, which allows a quick assessment of the cell suspension.
Keywords: cell suspensions, electrical impedance, transfer function, state space, the functional identification