The article describes the experience of the unique complex of works to improve the operational reliability of the emergency office buildings located in a cramped building, whose main task was to eliminate excessive rolls with hydraulic jacks and ensure the continued trouble-free operation. Highlighted the key features of the design and technology solutions for the simultaneous lifting and leveling of several buildings with different design decisions.
Keywords: adjustable foundation, electro-hydraulic flat jacks, cramped building, lifting and leveling, operational reliability.
The problems concerning the application of neural networks for solving the topical problem of rationing energy consumption educational institutions (EI). A scheme of the neural network approach for determination of the normative costs of electricity and heat EI. In the package Neurosolutions created neural network model of power and heat consumption of classical universities. Advantages of neural networks for solving the problem of rationing
Keywords: standard consumption, energy consumption, educational institutions, artificial neural network
For miniaturized vacuum klystron type devices utilization of a double- gap strip-line cavity with suspended ceramic substrate is very promising.
The two-mode operating mode of such cavities practically isn't studied enough; so there is the great scientific and practical interest for research of electrodynamic characteristics of cavities during multi-mode operation that correspond to simultaneous excitement of anti-phase and co-phase modes in a double gap.
In this article results of the 3-D numerical modeling by means of the Ansoft HFSS code are presented, and also the experimental results of the electrodynamic properties of the half-wave double- gap cavity with the suspended ceramic substrate are submitted. Optimum parameters of this design, allowing to carry out simultaneous excitement at multiple frequencies with frequency rate (K=2) are determined.
In such cavity high values of unloaded Q factors isn’t need because dielectric losses and conductor losses can be compensated at the expense of the negative electronic conductivity that brought by modulated electronic beam. The operating mode with frequency rate can be used for increasing of efficiency of generating and amplifying micro devices with filament cathode and matrix field emission cathodes.
Keywords: double-gap cavity, electrodynamic parameters, mathematical simulation, resonance frequency, characteristic impedance, method of planned experiment
The simulation of two-dimensional spherical crystals consisting of a large number of particles is carried out. These shells were analyzed based on their geometric structure and energy distribution. Various types of defects formed in a state of equilibrium is considered. Being shown the ambiguity of the existing method of their interpretation. A new way of describing such defects in the close-packed two-dimensional crystals with different topology is suggested.
Keywords: topological defects, two-dimensional materials, spherical crystals, topological charge
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
In article statistical data on failures on a linear part of the main gas pipelines are presented, the reasons of their emergence are defined. Standard scenarios of development of emergencies are provided, and also the basic principles of determination of frequency of emergence of failures are shined.
Keywords: accident, analysis, diameter, linear part of the main gas pipelines, depressurization, scenario, pipeline.
The optimization of the factors affecting the efficiency of Electro-activation of foam concrete mixes is carried out. For this purpose was applied mathematical planning experiment. As varied factors adopted grain size of sand grains, the value of the applied voltage and the duration of treatment. The mathematical models for strength, high density and structural quality are obtained.
Keywords: Variable electric field, foam-concrete mix, coefficient of structural quality,
This paper is devoted to research of the main problems of the external and internal environment of the Russian higher educational institutions in a modern economic situation. The methods, allowing to reveal and determine system effectiveness of management by university in aspect of marketing activity of higher educational institution are offered and proved
Keywords: Competitiveness of higher education institution, marketing environment, external and internal environment of higher educational institution, marketing audit, remote monitoring
Research areas of the department cover the working out of energy saving measures and research investigations allowing to introduce into production:
rational algorithm of automatic temperature control system which allows to cut down expenses on fuel and energy resources consumption;
-energy saving and more reliable drive system of oil circuit breakers with a cylindrical linear motor;
-innovative lighting systems;
-discharge monitoring in aqueous medium;
-rapid early disease detection in animals via photoplethysmography and pulse curves analysis;
-automatic control system in frame area;
-methane fermentation of wastes, etc.
All these directions for research allow to increase competitive advantages of agribusiness enterprises of the Udmurt republic
Keywords: LED-light - emitting diodes; linear cylindrical induction motor; biogas units; automatic control systems algorithm; photoplethysmography; automatic temperature control system
Article is devoted to strength calculations of compound designs. The deformed condition of a design from the blocks consisting of the basis in the form of a hexagonal plate, circular cylindrical cover rigidly connected with the basis is considered intense.
Keywords: plate, shell, the strength, the composite structure.
Article is devoted to strength calculations of compound designs. The deformed condition of the block under the influence of the external forces operating on a design, consisting of the basis in the form of the hexagonal plate which has been rigidly connected with the basis of a circular cylindrical cover is considered intense.
Keywords: plate, shell, the strength, the composite structure
Article is devoted to strength calculations of compound designs. The deformed condition of the block under the influence of any loading enclosed in its top is considered intense
Keywords: plate, shell, the strength, the composite structure
Article is devoted to strength calculations of compound designs. The deformed condition of the block under the influence of any loading enclosed in all its tops is considered intense
Keywords: plate, shell, the strength, the composite structure
The article provides a classification of defects in ceramic bricks, and use a checklist for quality data collection and analysis for quality control
Keywords: Ceramic brick, defects, statistics, checklist, quality, technology, management
The paper considers arbitrarily supported arbitrarily loaded reinforced, beam with an aggregate of bimodulus of elasticity material. Formulas for determination of the tangential stresses arising in the aggregate, subject to the reinforced elements. Formulas are obtained for principal stresses occurring at an arbitrary point in the aggregate, as well as the equation for determining the point where major stresses reach extreme values. Are terms of strength as the classical theories of strength, and strength criteria applied for calculation of constructions made of bimodulus of elasticity material.
Keywords: reinforced beam, bielastic modulus, stress, normal concrete, strength criteria.