4,693 research outputs found
The Development of Parallel Resolution Algorithms Using the Graph Representation
The parallel resolution procedures based on graph structures method are presented. OR-, AND- and
DCDP- parallel inference on connection graph representation is explored and modifications to these algorithms
using heuristic estimation are proposed. The principles for designing these heuristic functions are thoroughly
discussed. The colored clause graphs resolution principle is presented. The comparison of efficiency (on the
Steamroller problem) is carried out and the results are presented. The parallel unification algorithm used in the
parallel inference procedure is briefly outlined in the final part of the paper
A Real-time Decision Support System Prototype for Management of a Power Block
This paper describes the basic tools for a real-time decision support system of a semiotic type on
the example of the prototype for management and monitoring of a nuclear power block implemented on the
basis of the tool complex G2+GDA using cognitive graphics and parallel processing. This work was supported
by RFBR (project 02-07-90042)
Differential method for measuring periodic magnetic structure
The improvement of accelerator parameters requires the transition to
superconducting undulator technologies since SCUs allow higher magnetic fields
compared to classical planar undulators with the same gap. The primary method
for characterizing magnetic structures is to measure the magnetic field
distribution along the undulator axis with a Hall probe. Special test rigs
based on vertical cryostats with liquid helium are used to parameterize
superconducting magnetic structures (undulator coils). However, during the
probe immersion and cooling to cryogenic temperatures, its linear dimensions
change, which needs to be taken into account by applying complex thermodynamic
models since the position encoder of the probe is located on the cryostat
flange at room temperature. To eliminate this effect, it is proposed to equip
the probe with two Hall sensors spaced apart half a period of the measured
structure.Comment: 5 pages, 8 figures, 8 reference
Spherically averaged phased translation function and its application to the search for molecules and fragments in electron-density maps
Journal ArticleThe molecular-replacement method has been extended to locate molecules and their fragments in an electron-density map. The approach is based on a new spherically averaged phased translation function. The position of the centre of mass of a search model is found prior to determination of its orientation. The orientation is subsequently found by a phased rotation function. The technique also allows superposition of distantly related macromolecules. The method has been implemented in a computer program MOLREP and successfully tested using experimental data sets
Research of transportation efficiency of low-energy high-current electron beam in plasma channel in external magnetic field
Effective high current (5-20 kA) and low energy (tens of keV) electrons beam transportation is possible only with almost complete charging neutralization. It is also necessary to use quite high current neutralization for elimination beam self-pinching effect. The research is based on the self-consistent mathematical model that takes into account beam and plasma particles dynamic, current and charge neutralization of electron beam and examines the transportation of electron beam into a chamber with low-pressure plasma in magnetic field. A numerical study was conducted using particle in cell (PIC) method. The study was performed with various system parameters: rise time and magnitude of the beam current, gas pressure and plasma density and geometry of the system. Regularities of local virtual cathode field generated by the beam in the plasma channel, as well as ranges of parameters that let transportation beam with minimal losses, depending on the external magnetic field were determined through a series of numerical studies. In addition, the assessment of the impact of the plasma ion mobility during the transition period and during steady beam was performed
The Development of the Generalization Algorithm Based on the Rough Set Theory
This paper considers the problem of concept generalization in decision-making systems where such
features of real-world databases as large size, incompleteness and inconsistence of the stored information are
taken into account. The methods of the rough set theory (like lower and upper approximations, positive regions
and reducts) are used for the solving of this problem. The new discretization algorithm of the continuous attributes
is proposed. It essentially increases an overall performance of generalization algorithms and can be applied to
processing of real value attributes in large data tables. Also the search algorithm of the significant attributes
combined with a stage of discretization is developed. It allows avoiding splitting of continuous domains of
insignificant attributes into intervals
Body segments cooperation during forehand stroke production in young and adult tennis players
The purpose of the study was to investigate biomechanical characteristics of the forehand stroke production in adult and young tennis players, such as body segments cooperation, separation angle (x-factor) and max speed of a racquet. Kinematic data was collected with an optoelectronic motion capture system Qualisys. Participants in the experiment were 6 mid-level adult tennis players (age 19.5 ± 2.3 years, weight 66.8 ± 7.7 kg, height 170.5 ± 7.8 cm, sports experience 13.2 ± 1.7 years) and 4 young tennis players (age 11 ± 0.6 years, weight 43.5 ± 4.8 kg, height 156.3 ± 4.8 cm, sports experience 5 ± 0.5 years). The task of the motion was to carry out 3 forehand strokes for 3 times, the position of the feet and type of stance was not regulated. Results showed that racquet speed during forehand follow through phase, is significantly higher in adult players. Adult athletes have significantly higher x-factor values, which indicates that they more effectively implement muscle-tendon complex pre-stretching principle during backswing and forward swing phase. As well as adults, young tennis players also perform principle of sequential action of body segments during the stroke production, according to their technical skills and level of training.This study is a part of research, financially supported by ESF project “Atbalsts sporta zinātnei” Nr. 2009/0155/1DP/1.1.2.1.2/09/IPIA/VIAA/010
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Investigation of high purity beryllium for the International Thermonuclear Experimental Reactor (ITER), Task 002. Final report
The report includes a description of experimental abilities of Solid Structure Research Laboratory of IAE NNC RK, a results of microstructural characterization of A-4 grade polycrystal Beryllium produced at the Ulba metal plant and a technical project-for irradiation experiments. Technical project contains a detailed description of five proposed experiments, clearing behavior of Beryllium materials under the influence of irradiation, temperature, helium and hydrogen accumulation. Complex irradiation jobs, microstructural investigations and mechanical tests are planned in the framework of these experiments
Development and analysis of functional model of business process design of steam turbine plants on the example of the steam turbine department SBTt CJSC "The Ural Turbine Works"
Статья представляет собой анализ производственных и бизнес процессов ОПТ (отдела паровых турбин) ЗАО «Уральский турбинный завод». Целью анализа является создании функциональной модели типа «As-Is» и информационных связей системы проектирования паротурбинных установок.This article is an analysis of production and business processes of the DST (department of steam turbine), CJSC "The Ural Turbine Works". The purpose of the analysis is to create a functional model of the type "As-is" and information links system design of steam turbine plants
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