Preview
No 3 (2010)
5-10 517
Abstract

Formation of engineering higher education institution and restoration processes of higher agricultural school and inMinskare closely interrelated with each other. TheBelarussianNationalTechnicalUniversityand theBelarussianStateAgriculturalAcademyare celebrating their jubilees in 2010.

ARCHITECTURE AND CIVIL ENGINEERING

11-15 580
Abstract

Civil engineering material science has accumulated a great amount of scientific data on corrosive processes occurring in the NPS concrete structures (including the Bushehr NPS, Islamic Republic of Iran) due to environmental conditions.

This practical material creates appropriate prerequisites for generalizations, presentation of results in the form of mathematical models permitting to make calculations on durability of the NPS concrete and reinforced concrete  structures with the required accuracy.

 

15-20 1671
Abstract

A calculative-graphic method for designing structure of heavy concrete with chemical additives is developed in the paper. The paper presents a system of concrete frost resistance forecasting which is based on estimation of structural and mechanical characteristics of a material. Accuracy of calculations shown in the paper is rather sufficient for practical purposes.

20-27 654
Abstract

A methodology  for determination of estimated performance of main road-building materials (asphalt concrete and сold recycled material) within wide range of temperature and strain rate, is developed in the paper and it allows to obtain the whole spectrum of parameters required for calculation of a road pavement structure with minimum number of test results. This technique can be useful in designing material and pavement structure during its repair while using the method of cold in-place recycling because it enables significantly to reduce a number of laboratory tests. The methodology has been implemented as a computer program for its practical application.

METALLURGY. МЕТАL WORKING. MECHANICAL ENGINEERING

28-32 1559
Abstract

The paper considers wall thickness changes of a round billet in the pipe expansion process with subsequent flanging owing to thinning of this wall in the strain zone and bearing strain of an internal edge. Equations for calculation of thinning value are given in the paper. 

32-37 577
Abstract

The paper proposes an analytical model for topography of a magnetic field while making magnetic and abrasive machining of discontinuous surfaces. Topography analysis has made it possible to determine a rational configuration of an operational zone of electromagnetic system pole pieces while machining gear wheel.

37-40 1639
Abstract

The paper considers concrete industrial thermal technological processes where the problem concerning their control is necessary to investigate as a problem pertaining to control of systems with distributed parameters. A structural scheme for solution of the problem concerning optimization of thermal technological processes is proposed in the paper.

 

40-44 1633
Abstract

The paper presents results of investigations on dependence of dielectric, electromechanical and elastic properties of BNпсф  polycrystals (sphalerite) with texture axis [111]сф, obtained from pyrolitic boron nitride  BNпг on annealing temperature up to 2173 К. Peculiar features concerning changes of the given properties in the zone of low-temperature annealing 700–773 К and phase transformation BNпг — BNпсф  are shown in the paper.


INSTRUMENT ENGINEERING. INFORMATICS

45-50 651
Abstract

The paper proposes methods for preliminary machining of sawing disk lateral surfaces before their charging that  provide formation of micro-relief grains on them which are favorable for introduction. The experimental data reflect influence of accepted methods for machining initial disk blanks on abrasive ability and wear resistance of diamond-containing coatings which are obtained on them with the help of charging.

50-56 1559
Abstract

The paper provides a design description of a tool used for polishing balls made of brittle materials between bottom driving disk and two rings. An external stationary ring has a ring turning of rectangular profile that helps the ring to be based directly on the balls which are to be polished and take self-aligned position in relation to tool rotation axis.  Forces acting on the balls in the points of contact with the tool with due account of friction against a separator and conditions of ball sliding along ring working surfaces are determined in the paper. Dependence for determination of stationary and driving ring load ratio when balls are sliding along two contact surfaces of the tool is ascertained in the paper. The paper contains recommendations on selection of modes for ball polishing at its initial and finishing stages.

56-62 1665
Abstract

The paper considers sources of uncertainties appearing while making measurements within SHF range. Mathematical models and algorithms for uncertainty calculation at distance calibration of terminating power  and digital frequency meters are proposed in the paper.

TRANSPORT

63-66 613
Abstract
The paper investigates a possibility to apply European norms on designing of welded constructions for frames of heavy-load mining dump trucks. Comparison of results concerning tests of welding joint specimen made of local steel with recommended standards of fatigue curves is executed in the paper. The paper reveals that while forecasting resource of automotive constructions with the accepted practical accuracy it is possible to use generalized fatigue resistance characteristics of standard welding joints.

 

66-71 509
Abstract

Time norms on diagnostics of load-lifting crane units and parts with expired service life in 2007. have been developed and introduced on the basis of statistical data  collected at technical diagnosing of various load-lifting crane models under various weather conditions and which are in operation on theBelarusrailway.

71-73 560
Abstract
The paper considers a problem on noise level reduction while tram moving curves. A method for its reduction has been developed in the paper.

POWER ENGINEERING

74-77 529
Abstract

The paper  presents an algorithm for optimization of thermal load distribution among heat-sources in the system of centralized heat supply. The algorithm can be used while elaborating plans for development of heat supply systems in cities and settlements.

77-83 687
Abstract
The paper presents results of experimental investigations on determination of individual current-time curves of single-pole automatic household switches. Difference in time of full switching-off of automatic switches of one series and nominal current release devices manufactured by various companies are analyzed in the paper.

HUMANITIES AND SOCIO-ECONOMIC SCIENCES

84-89 630
Abstract

Theoretical and methodological comprehension of customs regulation place and role in provision of trade and transport activity under conditions of world integration processes is considered in the paper.

The essence of such economic categories as «customs policy», «customs regulation», «customs and tariff regulation», «customs business» is ascertained with the help of justified argumentation, clear conception approaches.
89-93 528
Abstract
Logic and methodological analysis of joint nature and society development program  formation has been carried out in the paper. The paper shows the role of theory as means of scientific cognition. The paper considers methodological functions of structural components of theoretical knowledge.
93-102 620
Abstract

Characteristics of a project can change during its construction. It is necessary to decrease a negative influence of such changes. In order to reveal the influence a methodology for cost evaluation of a project having dynamic characteristics is proposed in the paper. The methodology is developed on the basis of a standard scheme used for evaluation market building cost prior to and after making changes. The changes that cause an increase of the market cost are considered as improvements, and  the changes that entail decrease or do not influence on the market cost are considered as deteriorations. Due to this an investor applies more efficiently leverages for management of investment and construction project.



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