№ 129(5), May, 2017
Public date: 31.05.2017
Archive of journal: Articles count 97, 240 kb
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MODEL OF MANAGEMENT SYSTEM OF LABOR PROTECTION OF A MACHINEBUILDING COMPANY
DescriptionThe article considers a combination of the process-based and systematic approach in the management of OSH at the enterprise for the development of the OSH management system model. The OSH management system is created by the enterprise based on the model provision, the branch requirements and recommendations of the current standards. Features of the system are determined by the state of the external and internal environment of the enterprise (context). The context forms the basic requirements for the inputs of the system and determines its capabilities. An analysis of the context of the enterprise makes it possible to identify the system: describe its inputs and outputs, identify key stakeholders and consumers. Based on this analysis, a model of the OSH management system is suggested, which, in analogy with the modern model of the quality management system, allows us to identify the place of the OSH in the context of the organization, and also to clarify the interaction of the main groups of OSH
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DEVELOPING AN EXPERT INFORMATION SYSTEM FOR SOCIAL PROTECTION
DescriptionThe article presents a study of types of expert systems (ES) and methods of their construction. We have developed principles of functioning and the architecture of dynamic ES for social protection that can modify its behavior depending on the changes in the subject area and in specified scripts of functioning
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Description
Improvement is offered for working bodies’ forms in devices for preparation of forages by methods of engineering geometry and computer graphics. That opens not only great opportunities for intensification, increase in productivity and efficiency of the technological processes, but also opens ways for creation of small-sized devices for their realization. Constructive study of geometry of working bodies surface, allows us to give wavy movement to particles of forage and impart them the movement with bigger power consumption. In such installations forage particles components, meeting walls of working body, change their direction and, meeting other portions of particles of forage components, mix up. From loading to unloading, throughout the installations working body length, flexible and strong waves of forage particles components movement inside the working body are born. The conducted pilot studies have shown that as a result of working bodies’ forms improvement of devices for preparation of forages by methods of descriptive geometry such devices can be implemented in a variety of industries
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BUILDING A LOGICAL FUNCTION FOR DESCRIPTION OF A LIFT MOTION
DescriptionIn automatic devices, relay-contact circuits are widely used. The development and description of such schemes is quite a challenge. It is known that the apparatus of algebra of logic can be used with success here. In the article the description of the elevator movement scheme is considered first in the usual way (as it is customary to describe in the instructions), then by the formulas of mathematical logic. A mathematical description of the movement of the cabin of a passenger elevator in the form of a logical function has been obtained
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Description
At present, electrochemical analysis methods are increasingly used to solve the problem of research on quantitative and qualitative indicators of organic substances. One of the most common electrochemical methods of analysis is conductometry. Along with the straight line, indirect conductometry is often used, in which the substances under analysis react with the corresponding components before the measurement, and the fixed change in electrical conductivity is determined exclusively by the presence of the products of the reaction that occurred. A necessary condition for the application of this method is the presence of ions in the reaction medium, and since the pectic substances are polyelectrolytes, this condition is met, which allows us to use the conductometric titration method to determine the quantitative and qualitative characteristics of pectic substances. The technique we propose relates to technical biochemistry, namely, to the determination of the amount of pectin substances in plant raw materials. We have prepared "standardized" solutions of fractions of pectin substances. Samples of solutions of fractions are taken. Saponification of fractions of pectin substances in the samples of the solutions under analysis is carried out with 2.5 ml of 40% NaOH solution. Fractions of the pectin substances are precipitated with 2.5 ml of concentrated HCl. The solutions to be analyzed are centrifuged in 50 ml test strips at a rotor speed of at least 5000 rpm for 5-7 min. Suspensions of pectin fractions with distilled water are suspended in a beaker for titration with a magnetic stirrer for at least 30 minutes. Conductometric titration of suspensions of precipitates of fractions of pectic substances is carried out with stirring. Based on the results of conductometric titration, graphs are plotted, according to which the volume of titrant consumed for titration of pectic acid is established. Calculation of the mass fraction of fractions of pectic substances is carried out according to the formula. The methodology is distinguished by the simplicity of implementation, which makes it possible to obtain accurate data at high convergence of parallel analyzes, and it saves labor and time costs at all stages of the process
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Description
The article presents two express-methods of multidetails women’s dresses design, which allow to determine the optimal size and form of the cut out details depending on the way of clothes form shaping. Methods are developed based on the Paco Rabanne’s fashions analysis
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THE BASICS OF CALCULATING THE PROBABILITY OF FAILURE-FREE OPERATION OF SUPPLY BUSES AND BUS SECTIONS
DescriptionIn agriculture, the high reliability of electricity supply is necessary because of its main feature production is associated with biological objects. The change in the state parameters can lead to a sharp decrease in the productivity of the biological system or, in general, to the death of it. The following enterprises are particularly critical to the reliability of power supply: dairy farms, hothouse complexes, incubators, grain storage sites, finished products and much more. The article presents: models of failure of switchable busbar, models of failure of supply buses; formulas for the calculation of reliability indicators, the calculated values of the probabilities of failure-free operation of individual elements, analysis of the values obtained, conclusions were made on the models presented and suggestions were made for introduction into production, energy conservation was associated with reliability of electrical installations
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Description
The article reveals the basic principle of stabilizing the DC voltage, providing automatic control of electrical devices and electrical equipment, control systems, control and protection, etc. There are functional diagrams (operated and promising) of DC voltage stabilization with a device included in the input and output power circuits of the rectifier, and a new structural solution to a functional circuit of the rectifier made of two controllable power electronic devices and transformer with midpoint. The article lists peculiarities of the circuits of the voltage regulators and their main advantages and disadvantages. We have reviewed functional diagrams of existing and new solutions of the stabilizers and the characteristics of their work; it will increase the effectiveness of pre-project works on the development of stabilizers of the DC voltage with improved performance characteristics. This article might be useful for post-graduates and research workers who are involved in the development of DC voltage stabilizers
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PHENOMENOLOGICAL APPROACH TO THE DESCRIPTION OF TRANSPORT PROCESSES IN LOOSIBILE MATERIALS
DescriptionA mathematical description of the potentials of mass-transfer of hygroscopic materials is possible on the basis of analytical expressions describing sorption and desorption isotherms. Because of the complex nature of the interaction of colloidal capillary-porous materials with moisture, determined by the action other than sorption forces (physical sorption, absorption, chemisorption), capillary condensation forces and osmotic forces, which for different materials are specific and quantitatively different, to date There is no single universal dependence for the analytical description of isotherms of sorption and desorption. Accordingly, there is a wide variety of analytical expressions for the description of isotherms of sorption and desorption. There are many different methods of analytical description of the sorption properties of colloidal capillary-porous materials. All known methods can be divided into two groups: the first should include analytical expressions derived theoretically on the basis of various hypotheses and assumptions, while the second - purely empirical based on the expansion or change in the forms of models of the first group. A large number of equations of equilibrium isotherms are mathematically equivalent. Thus, the method of determining the transport potential based on position allows us to take as a basis for calculation the experimental data on the hygroscopic properties of certain materials and to use the phenomenological approach for the engineering calculation of complex technical devices
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FEATURES OF APPLICATION OF METHODS OF MULTICRITERIA OPTIMIZATION IN THE SPHERE OF PUBLIC CATERING
DescriptionThe foodservice industry plays an increasingly important role in modern society and every person. This is achieved primarily due to the changing technologies of food processing, development of communications, the means of delivery of products and raw materials, the intensification of many industrial processes. Catering is one of the most important socio-economic components of the level of development of society. The production process consists of the partial tasks of providing, storing, manufacture, sale, distribution, financing, optimization of the warehouse, personnel training and the introduction of new technologies and management. The aim of the study is determination of methodology of optimization of procurement activities in the field of restaurant business, using mathematical programming methods. In catering should pay special attention to the costs of procurement. When choosing a method of solution you need to consider the shelf life of products purchased, calculate the number of them required for dishes and many other important criteria. Today there are thousands of solutions to the optimization problems of planning and management, but many of them also have a number of disadvantages, for example, do not cover all aspects of the subject area, neither provide complete information