RĒZEKNES AUGSTSKOLA INŽENIERU FAKULTĀTE RĒZEKNES AUGSTSKOLAS REĢIONĀLISTIKAS ZINĀTNISKAIS INSTITŪTS REZEKNE HIGHER EDUCATION INSTITUTION FACULTY OF ENGINEERING SCIENTIFIC INSTITUTE FOR REGIONAL STUDIES VIDE. TEHNOLOĢIJA. RESURSI IX starptautiskās zinātniski praktiskās konferences materiāli 2013.gada 20.-22.jūnijs 2. SĒJUMS ENVIRONMENT. TECHNOLOGY. RESOURCES Proceedings of the 9th International Scientific and Practical Conference June 20-22, 2013 VOLUME II Rēzekne 2013 VIDE. TEHNOLOĢIJA. RESURSI: 9. starptautiskās zinātniski praktiskās konferences materiāli 2013. gada 20.-22. jūnijs. 2. sējums. Rēzekne, 2013. 148 lpp. ENVIRONMENT. TECHNOLOGY. RESOURCES: Proceedings of the 9th International Scientific and Practical Conference June 20-22, 2013. Volume II. Rezekne, 2013. p. 148. Zinātnisko rakstu krājumā iekļauti IX starptautiskās zinātniski praktiskās konferences “Vide. Tehnoloģija. Resursi” raksti. Rakstu tematika saistīta ar vides kvalitāti un monitoringu, piesārņojuma novēršanas tehnoloģijām, tīrāku ražošanu, ilgtspējīgo lauksaimniecību, vides izglītību un ekonomiku. Rakstu krājumā pārstāvēti referāti, kas ir saistīti ar datorzinātnes, matemātikas, mehānikas, elektrotehnikas, elektronikas un mehatronikas pielietošanu vides zinātnē, metālapstrādē un citu nozaru problēmu risināšanā. Proceedings include papers presented at the 9th International Conference “Environment. Technology. Resources.” The themes of the papers are – the environmental quality and monitoring, pollution prevention technologies, cleaner production, sustainable agriculture, environmental education and economics.The conference includes papers on applications of computer science, mathematics, mechanics, electrical engineering, electronics and mechatronics for solution of environmental, metal industry and other problems. Organizing Committee: Dr.habil.geol. G.Noviks – Chairman (Rezekne Higher Education Institution, Latvia) Dr.sc.ing. E.Teirumnieks – Co-chairman (Rezekne Higher Education Institution, Latvia) Dr.sc.ing. A.Martinovs (Rezekne Higher Education Institution, Latvia) Dr.sc.ing. P.Grabusts (Rezekne Higher Education Institution, Latvia) Dr. W.Leal (Hamburg University of Applied Sciences, Germany) Dr. V.Morozov (Russian Academy of Sciences, Russia) Dr.-Ing. J.Timmerberg (Jade University of Applied Sciences, Germany) Dr. J.-R.Pastarus (Tallin University of Technology, Estonia) Dr. L.Kliučininkas (Kaunas University of Technology, Lithuania) Dr. M.Zilbershmidt (Moscow State Mining University, Russia) Dr. T.Chrzan (The University of Zielona Góra, Poland) Dr.ing. I. Plohov (Pskov State University, Russia) Dr.-Ing. S.Kartunov (Technical University of Gabrova , Bulgaria) Dr.sc.ing. A.Teilāns (Rezekne Higher Education Institution, Latvia) Dr.sc.ing. O.Užga - Rebrovs (Rezekne Higher Education Institution, Latvia) Reviewers: Dr.sc.ing. J.Andersons (University of Latvia, Institute of Polymer Mechanics, Latvia) Dr.sc.ing. I.Dreijers (Riga Tehnical University, Latvia) Dr.sc.ing. A.Galiņš (Latvia University of Agriculture, Latvia) Dr.sc.ing. D.Kalniņa (Riga Tehnical University, Latvia) Dr.sc.ing. J.Mālers (Riga Tehnical University, Latvia) Dr.paed. P.Vucenlazdāns (Rezekne Higher Education Institution, Scientific Institute for Regional Studies, Latvia) Dr.sc.ing. I.Silineviča (Rezekne Higher Education Institution, Scientific Institute for Regional Studies, Latvia) Dr.oec. S.Ežmale (Rezekne Higher Education Institution, Scientific Institute for Regional Studies, Latvia) Editorial Committee: Dr.habil.geol. G.Noviks (Rezekne Higher Education Institution, Latvia) (managing editor) Dr. W.Leal (Hamburg University of Applied Sciences, Germany) Dr.sc.ing. Ē.Kronbergs (Latvia University of Agriculture, Latvia) Dr.sc.ing. E.Teirumnieks (RA, Latvia) Dr. L.Kliučininkas (Kaunas University of Technology, Lithuania) Dr. R.Tepfers (Chalmers University, Sweden) Dr.ing. I. Plohov (Pskov State University, Russia) Dr.sc.ing. L.Lazov (Technical University of Gabrova , Bulgaria) Dr.sc.ing. P.Grabusts (Rezekne Higher Education Institution, Latvia) Dr.sc.ing. A.Martinovs (Rezekne Higher Education Institution, Latvia) Steering Committee: Mg.chem. Ē.Teirumnieka Rēzeknes Augstskola Mg.soc.sc. V.Ansone Atbrīvošanas aleja 90, Rēzekne, LV 4601 Mg.sc.env. S.Augule RA Izdevniecība, 2013 Atbrīvošanas aleja 115, Rēzekne, LV 4601 Editor Vita Ansone ISSN 1691-5402 CONTENT IV COMPUTER SCIENCE Balikova V. OFFER OPPORTUNITIES OF LEVELLING ONLINE COURSES FOR LATVIA …………………………………….. 7 Grabusts P. THE CONCEPT OF ONTOLOGY FOR NUMERICAL DATA CLUSTERING ………………………………………………… 11 Ilarionov R., А SYSTEM FOR INPUT OF 3D OBJECTS INTO Krastev K. COMPUTING ENVIRONMENT ……………………………... 17 Kodors S., URBAN OBJECTS SEGMENTATION USING EDGE Zarembo I. DETECTION …………………………………………………... 26 Motaylenko L., DEVELOPMENT OF INFORMATION MODEL OF Poletayeva O., FORMING BASIC EDUCATIONAL PROGRAMS IN THE Lyokhin S. LIGHT OF PROFESSIONAL COMPETENCIES …………….. 30 Uzhga-Rebrov O., THE PROSPECTS OF USING FUZZY APPROACHES TO Kuleshova G. ECOLOGICAL RISK ASSESSMENT ………………………... 34 Valbahs E., PATH PLANNING USAGE FOR AUTONOMOUS AGENTS 40 Grabusts P. Zarembo I., PATHFINDING ALGORITHM EFFICIENCY ANALYSIS IN Kodors S. 2D GRID ……………………………………………………….. 46 V MECHANICS, MECHANICS OF MATERIALS Balashev I., FORCE-IN-CHAIN STUDY OF CHAIN-ELECTRIC HOIST Macuta S. WITH PERIODICAL VARIABLE ANGULAR ROTATIONAL VELOCITY OF CHAIN-WHEEL ………….. 53 Gaile L. ANALYSIS OF DYNAMIC PARAMETERS OF OBSERVATION TOWERS IN LATVIA …………………….. 57 Lusis V. FORMWORK WITH VARIABLE GEOMETRY FOR CONCRETE SHELLS PRODUCTION TECHNOLOGY ……. 63 Lusis V., FIBERCONCRETE WITH NON-HOMOGENEOUS FIBERS Krasnikovs A. DISTRIBUTION ………………………………………………. 67 Nikiforov I., INFLUENCE OF HEAT TREATMENT AND THE Maltsev P. COEFFICIENT OF FRICTION ON THE VOLUME OF METAL REMOVED DURING GRINDING STEEL 35 ……... 72 Sprince A., CASE STUDY ON EARLY AGE SHRINKAGE OF Pakrastinsh L. CEMENT-BASED COMPOSITES …………………………… 79 Strochkov I.A., SOLUTION OF LINEARIZED FLAT PROBLEM OF Khvattcev A.A. HYDRODYNAMICS (IVF) …………………………………... 85 VI ELECTRICAL DRIVE, ELECTROTECHNICS, ELECTRONICS AND MECHATRONICS Abrahamyan H., MODEL OF RADIO MANAGING SYSTEM FOR ELECTRO Sargsyan A., Davtyan D., VEHICLES’ ACCUMULATORS WIRELESS FEEDING …... 93 Minasyan H. Andreev M., Zhuravlev Y., AUTONOMOUS POWER STATION BASED ON ROTARY- Lukyanov Y., Perminov L. VANE ENGINE WITH AN EXTERNAL SUPPLY OF HEAT 97 Domracheva Y., SIMULATION TECHNIQUE OF SYNCHRONOUS Loginov S. RELUCTANCE BEARINGLESS MACHINE ………………... 101 Fedotov I., SIMULATION OF TRACTION ELECTRIC DRIVE WITH Tikhonov V. VECTOR SYSTEMS OF DIRECT TORQUE CONTROL …... 106 Ilyin A., Plokhov I., THE SIMULATION MODEL OF A SLIDING CONTACT …. 111 Isakov A. Isakov A.N., Andrusich DEVICE FOR REDUCTION SPARKING OF SLIP RING OF A.V., Savraev I.E. TURBO GENERATOR ……………………………………….. 116 Khitrov An., ELECTRICAL SUBSYSTEM OF THE LOW-POWER Khitrov Al. COGENERATION PLANT WITH LOW-SPEED VEHICLE ... 119 Kroics K. DIGITAL CONTROL OF VARIABLE FREQUENCY INTERLEAVED DC-DC CONVERTER ……………………... 124 Markov A., SELECTION OF PARAMETERS OF CURRENT Rodionov Y. COLLECTION SYSTEMS OF TURBO-GENERATORS TO BE MONITORED BY MEANS OF TECHNICAL DIAGNOSTICS ………………………………………………... 130 Narica P., Gerbreders V., TECHNOLOGY FOR OBTAINING Cu2ZnSnSe4 THIN Akmene V., Mihailova I. FILMS ………………………………………………………….. 134 Nenov N., Tomchev P., STUDY OF THE ION RADIATION INFLUENCE ON THE Ivanova R. PARAMETERS OF UNIJUNCTION TRANSISTORS ………. 137 Pavlov A., FLOWLINE WITH RESISTIVE ELECTRIC HEATING Plohov I. SYSTEM ……………………………………………………….. 140 Trashchenkov S. FUNCTIONAL SAFETY OF POWER PLANT’S TECHNOLOGICAL PROTECTIONS ………………………… 142 List of author …………………………………………………………………………………… 146 IV COMPUTER SCIENCE Offer Opportunities of Levelling Online Courses for Latvia Vita Balikova Riga Technical University, Azenes iela 12, Riga, LV1048, Latvia, [email protected] Abstract. Currently, all European countries, including Latvian, there is a decrease of students' mathematical knowledge. As a result, universities and high schools face the challenge of filling the knowledge in mathematics among students. This has resulted in increasing the level of knowledge disparity in study groups. And experience shows that many students need extra - levelling courses. One of solution of such courses would be a free on-line levelling courses. Key words: levelling course, e-learning, open educational resources, online education, massive open online course (MOOC). I INTRODUCTION students of mathematics competence since 2003 Study in the first year is a period of adaptation of practically unchanged. the students in the new educational environment. A OECD PISA (Programme for International Student significant increase in the amount of information Assessment of the OECD) in 2006 and PISA 2009 students need to learn in one session is a serious will no longer show the Latvian education quality problem for first-year students. In a lesson in school average growth, as demonstrated by the OECD pupils usually study new material for an average of program for the first cycles and other international twenty minutes, the new information in the university comparative studies of education quality, such as the student should take during the whole session. IEA TIMSS. Latvian is a relatively small primary Problems encountered by students learning new school with good and outstanding achievement in material also due to the high level of abstraction reading, mathematics and science, and their number inherent in the concepts, terms, for example, in higher continues to decline. It would seriously hamper