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No 3 (2011)

METALLURGY. МЕТАL WORKING. MECHANICAL ENGINEERING

5-8 1481
Abstract

The paper presents investigation results pertaining to magneto-abrasive machining of product surfaces formed by electromagnet surfacing with a plastic deformation of P6M5K5 powder.

 

9-12 598
Abstract

The paper considers problems on accuracy assurance of machine component cutting while using edge tools. An approach based on artificial intelligence technologies in particular technologies of functional semantic networks. The paper analyzes a possibility to apply functional semantic networks for optimization of cutting parameters. An intellectual system intended for solution of applied problems is described in the paper. The paper reveals a system structure and an example for setting optimal cutting speed is cited in the paper.

 

INSTRUMENT ENGINEERING. INFORMATICS

13-18 652
Abstract

The paper proposes a mathematical apparatus for image processing of a cast-iron microstructure of a pearlite class that has casually distributed graphite inclusions in the structure the software has been developed and it allows to determine statistical functions concerning distribution of graphite inclusion characteristics according to areas, perimeters and distances between inclusions. The paper shows that computer processing of gray pig-iron microstructure image makes it possible to classify microstructures on the basis of statistical distribution of a graphite phase which are considered as indiscernible while applying conventional metallographic methods and it has practical significance for investigation of the interrelations – «workability – cast iron microstructure».

CIVIL AND INDUSTRIAL ENGINEERING

19-22 682
Abstract

The paper shows that for overall estimation of soil water permeability it is necessary to know a horizontal water permeability value of a soil capillary border in addition to coefficients of filtration and permeability. Relations allowing to determine soil permeability in the area of incomplete saturation, are given in the paper. For a fully developed capillary border some calculation formulae have been obtained in the form of algebraic polynomial versus soil grading (grain composition). These formulae allow to make more accurate calculations while designing and operating  reclamation works.

23-27 1715
Abstract
The paper presents results of natural and numerical researches on operation of the underground ferroconcrete pipeline of a storm collector. Conclusions are drawn on the reasons of pipeline transition in a limiting state.
27-29 687
Abstract

Experimental measurements are considered on the basis of innovation technologies. The measurements have been conducted with the purpose to develop a methodology for geodesic crane track control. The paper proposes to execute geodesic observations simultaneously with the help of two tachymeters to a mini-reflector which is set in specially manufactured pattern. Cameral processing of geodesic measurement results is fully automated.

TRANSPORT

30-33 615
Abstract

The paper describes a possibility of simultaneous heating of cooling liquid and oil in an engine with the purpose to improve pre-starting preparation.  Assessment of heating  cooling liquid and oil intensity in an engine at different completing units of a heating system and directions of cooling liquid has been done in the paper. The paper contains characteristics of main liquid heaters applied in forestry machines manufactured at Minsk Tractor Works.

33-37 602
Abstract

The paper examines certain parameters of a determined model and its response to changes in these parameters. The determined model for bidirectional movement has been developed in the paper. The paper contains proposals for an optimization of the developed model which are intended for reduction of motor vehicle delays in front of an in-traffic light stop line along the main highway direction.

NATURAL AND ACCURATE SCIENCES

38-40 766
Abstract

The paper has proved that an associative ring which is solvable of a n- class as a Lie ring has a nilpotent ideal of the nilpotent class not more than 3×10n–2  and a corresponding quotient ring satisfies an identity [[x1, x2, [x3, x4]], x5] = 0.

41-42 1648
Abstract
The executed investigations have made it possible to determine hemicellulose content in cellulose  and substantiate a perspective technology of package while using the obtained cellulose.
42-47 525
Abstract

The paper presents an experimental unit with computer measuring systems software support for control of objects’ properties which are made of  electro-conducting and magnetic materials in impulse magnetic fields. Experimental dependences pertaining to value variations of electric voltage taken from induction magnetic head scanning a magnetic carrier at  action of an impulse magnetic field on electro-conducting object have been obtained in the paper. Application of the dependences permits significantly to improve control accuracy. The paper contains the developed magneto-graphic, magneto-optic and the Hall methods and devices used to control physical properties of objects made of electro-conducting and magnetic materials in an impulse magnetic field. All these methods and devices allow to increase an accuracy control.

48-50 1662
Abstract

The paper shows that cost effectiveness and profitability are considered as a general economic characteristic that reflects a final efficiency of an enterprise operation and its output products. The main index of cost effectiveness level is a ratio of a general profit amount to productive assets. Cost effectiveness of transport machinery manufacturing is presented as a relative index of business profitability level. Algorithms for calculation of main economic efficiency pertaining to transport machinery have been developed in the paper.

HUMANITIES AND SOCIO-ECONOMIC SCIENCES

51-55 618
Abstract

Specificity concerning cost formation of construction work executed by  entities of small business enterprises that use a simplified taxation system has a direct impact on the effectiveness of organization activity. Dozens of business entities applying various taxation systems are involved in the execution of the construction process. For this reason an inclusion of taxes in work cost may have a decisive influence on the selection of a contractor for an object construction.

 

 

55-50 587
Abstract

An investigation of the system efficiency requires a special approach in terms of its level, content and interrelations with an external environment. In this regard logistic  systems are rather complicated that consist of a number of service sub-systems and designed at various levels.  Such system complexity requires a development of an efficient mechanism for its design and operation of objects of the trans-boundary transport logistics. The efficiency of the trans-boundary transport and logistic systems (TTLS) can be described by a number of cost and physical indicators reflecting both market and traditional approaches. The TTLS have their own peculiar features concerning determination of efficiency that are related with the state regulation set of processes occurring  at border crossings. In order to assess the current operational process it is necessary to apply an index system which pays a special attention to a transport capability due to the TTLS specificity. While planning a custom automotive processing at a border checkpoint there is no need to aspire for an immediate passage of all vehicles by all means. The basic requirement is to maintain a transport capability in the operational zone. Thus an irregularity of incoming vehicles at border crossing points is smoothed out by regulating priorities pertaining to requirements of custom processing while using an urgency function of cargo transportation thereby ensuring an optimal operation of a customs post.

60-66 567
Abstract

The paper considers behaviour of material flows at stages of complicated  logistic industrial and transport systems. Key parameters of logistic delivery schemes are analyzed in the paper. The paper estimates an influence of a time parameter on the level of transport and logistics costs and, as a consequence, on  a final finished product.

While determining a stock level it is necessary to know not only an intensity of material resource consumption by manufacturing process  for a concrete period of time, but also a probability of non-observance of   transport service terms and cost of stock storage. Stocks of mass cargoes are basically formed at first stages of industrial and transport system and cost of their storage is relatively insignificant. However deficit presence of the given resources influences on functioning of all subsequent interrelated stages of the industrial and transport system.

Thus, a risk of deficit occurrence of the given resources can be probably reduced by creating a high stock rate. There is a processing of hi-tech component items (or half-finished products) at last stages of the industrial and transport system. Expenses on storage of such resources  are usually high and possibility of their substitution by analogous ones is insignificant. At last stages a mobilization of facilities for provision of on-time delivery is more profitable that allows to save on stock arrangement.

66-72 580
Abstract

The paper considers an approach which is based on non-conventional mechanisms of management style formation. The preset level of sustainable management is maintained by self-organized environment created in the process of management style transformation in efficient management principles. Their efficiency is checked within an adaptive algorithm. The algorithm is developed on the basis of combination of evaluative tools  and base of operational  proves. The operating algorithm capability is tested within the framework of an operating enterprise. The obtained results testify about  formation of sustainable business.

ENGINEERING EDUCATION

73-79 602
Abstract

The paper proposes and substantiates a mathematical model where a pragmatic knowledge competence of a trainee or a specialist is presented as a chronological product of pragmatic and knowledge competence evaluations. An average competence of every trainee is conventionally assessed by teachers’ community and pragmatic competence is assesed by students’ community with the help of group peer assessment method. The method is based on the hypothesis of normal (Gaussian) distribution of quantitative evaluations of every competence in a students’ group. A competence portrait of specialists has been prepared on the basis of the proposed model  and the paper reveals their competence formation in the educational and tutorial process.

 



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ISSN 2227-1031 (Print)
ISSN 2414-0392 (Online)