An estimate of the frequency discretization interval was obtained in solving diagnostic problems of a piezoceramic element by means of different methods based on measuring the active component of conductivity in a number of discrete points. This allows avoiding precision loss and, at the same time, reducing the number of measurements and computational operations.
Keywords: Piesoceramic element, Q-factor, active component of conductivity
The kinetics of the electrodeposition of zinc to the steel base of the sulfate electrolyte supplements with synthetic surfactants was studied. Found that at potentials more positive than the equilibrium value the process of pre phase zinc deposition. Additives synthesized organic compounds adsorbed to the surface of the electrode at its cathodic polarization, increasing of overvoltage process. The adsorption is in the range of 0,5•10-7 to 2,6•10-5 mol/сm2.
Keywords: zinc, electrolyte, electrode, surface-active agents (surfactants), electrodeposition, adsorption, diffusion coefficient, and pre phase deposition
The paper studies the possibility of quantitative processing of the GPR data for determining the dielectric permittivity and conductivity of a medium (soil samples). Experimental studies are made using radargrams of soil samples with specified values of moisture and conductivity. New methods of quantitative processing of radargrams are proposed in this work to determine the dielectric permittivity and conductivity of soils. The methods were successfully tested on various sections of Russian railways net.
Keywords: layered road profiling, GPR, soil moisture, soil layers profiling, soil conductivity
The problem of specificity of training students in high school artists. Defines the principles and features of training on the theoretical and practical sessions. Identifies the purposes of higher education.
Keywords: art education, teaching, vocational training, self-development
The importance of remote sensing of the earth, because of their unique features (wide territorial coverage, efficiency, control of remote areas, using all-weather radar imaging, etc.) are for environmental control and monitoring in the areas of economic activities such as oil and gas, agriculture, forestry and water management, in the evaluation of human and human impact on the environment.
Keywords: Remote sensing of the earth, satellite, sensor, digital images, photographs, environmental monitoring, desertification
"Is analyzed the need for the investment of capital, optimizing selection most effective measures, for the reduction of technogenic action, to an improvement in the prirodokhozyaystvennoy situation. Worsening in the state of natural environment definitely requires the additional investment of capital, which draws the rise in price of production and as a result reduction in production efficiency. The tasks of the economic and social development of society must be determined taking into account ecological factor, i.e., taking into account rational use of natural resources. A substantial change in priorities and purposes of the economy of Russia, all branches and its separate sectors is required for this. In this context to the foreground are advanced effective measures for environmental protection in the process of the prirodokhozyaystvennoy activity, which correspond to the concept of steady development.A29 It is expedient to correct the taxation of profit taking into account the profitability of nature-conservation measures, effectiveness of its use with the solution of other social problems, meant both for the society, and for the ecology as a whole: investment tax credits with a considerable decrease or the cancellation of percentages for the use by them; the priority crediting of the subjects of the economy, who inject the best technologies of taking nature-conservation measures; the compensation for the part of the interest rate on the credit due to federal dollar (to 50%). The introduction of innovation technologies in the formation of the system of control of functioning and realization of nature-conservation measures, is the most important tool of an increase in the competitive ability of regions and companies under these conditions. "
Keywords: investment climate, basic capital, ecological crediting, the concept of the steady development
In the article are considered the results of the researches of noncorrodibility of the concrete received with the use of industrial wastes and mineral-chemical additives of various structures in various combinations. Research has shown increase of noncorrodibility, durability and water resistance of the concrete obtained with the use of additives, and the most effective, at that, is the sharing of mineral-chemical additives.
Keywords: concrete, mineral-chemical additives, industrial wastes, noncorrodibility, decstrin, lignosulfonat, kinetic, durability
The problem of utilization of iron ore tailings . The prospects of iron ore mining in the Russian underground . A method for extracting iron from tailings to 9 % of the original content, by mechanochemical processing. The results of particle size distribution , chemical and mineralogical analyzes of samples collected waste ferruginous quartzites LGOK . Experiments were carried out using the methods of planning optimal experiments , Box-Behnken and included 24 experience. Obtained according to the content of metal recovery in the leach solution of sulfuric acid , sodium chloride , rotor speed and the ratio of disintegrant liquid and solid phases. This dependence allows to determine the optimal parameters of technology in terms of " metal recovery ." The resulting secondary processing of tailings to be used in the manufacture of hardening mixes for stowing as an inert filler and binder counterpart .
Keywords: tailings, mechano-chemical activation, iron ore, ferruginous quartzites, metal recovery
The results of computational experiments to determine the characteristics of the porous piezoelectric ceramics based on the methodology, including the effective modules method, simulations of representative volumes on a simple random method and the method of Witten-Sander, finite element method to solve static piezoelectric problems for heterogeneous composite media and the accounting of inhomogeneous polarization near the pores are presented. A comparison of the results of computer simulation with the known experimental data for the porous material PZT-4 and its analogs is realized. It is concluded that the accounting of inhomogeneous polarization in the vicinity of porous provide the better agreement between numerical results and large number of known experimental data. Thus, for most effective constants the smallest errors are obtained for a representative volume of the porous piezoelectric material, constructed by Witten-Sander method.
Keywords: piezocomposite, porous piezoelectric ceramics, inhomogeneous polarization, mathematical modelling, models of representative volumes, finite element method, effective moduli
This article deals with the unification of the elements of wood as on the principle of similarity with the material counterpart. Also estimated the economic benefits of the technical parameters of Glulam. As a result of optimizing the size of these elements. Unification is held on the main criterion of similarity bearing members with the solution graphically. Resulting in optimal size sections are then calculated the opportunity cost of production.
Keywords: unification, glued wooden structures
In article the safety mechanism in construction is shown. Main types of monitoring of unique buildings and constructions are opened
Keywords: risk, construction, monitoring, labor protection, safety
In article questions of planning of load-lifting works are reflected and the assessment of category of degree of risk is carried out
Keywords: risk, load-lifting mechanisms, labor protection, safety, technological cards
In article dynamics questions formation of drop ablation at destruction of bubbling streams are considered at a rupture of bubbles, experimental data of some characteristics of processes of destruction of streams are given, the analysis of the factors influencing formation of drop ablation is made
Keywords: drop ablation, bubbling, drop, stream, blanket
The coloration centres (CC) in crystals of rear earth gallium garnets (REGG): Gd3Ga5O12 (GGG), Gd3Sc1,6Ga3,4O12 (GSGG) и Nd3Ga5O12 (NGG) obtained by Chohraljskiy method, were investigated by methods of optical spectroscopy and spectral analysis in the wavelength range of 0,2-0,87 microns. In the case of keeping the samples under dark conditions, unstable CC were formed in the crystals of GGG and GSGG. The absorption maxima are at λmax1 = 0,243 m and λmax2 = 0,275 m at concentration of N ~ 1018 cm-3. It is suggested that the observed enlightenment is caused by the recharging of growth defects and occurring the energy levels in the band gap of garnets. It appears that these CC correspond to centres of O- holes, originated from gallium vacancies V3-Ga 3+ in tetrahedral and octahedral nots which form near clusters of [V3-Ga 3+ - V2+O2- ]
Keywords: color centers, rare earth gallium garnets, kristylly, Czochralski method, the crystal lattice
Belt conveyors are widely used in factories of building materials. They are used to transport bulk and General cargo on the short, medium and long расстояния.Установка the working body of the screw conveyor brushes allows to increase capacity of the conveyor by eliminating the accumulation of the material to be transported inside the gutter.
Keywords: Operating enterprise, belt and screw conveyors, building materials.