TECHNICAL UNIVERSITY OF MOLDOVA JOURNAL OF ENGINEERING SCIENCE Technical and applied scientific publication founded in 9 February 1995 Alternative title: Meridian ingineresc 2019 Vol. XXVI (4) ISSN 2587-3474 eISSN 2587-3482 TECHNICAL UNIVERSITY OF MOLDOVA (PUBLISHING HOUSE) „TEHNICA UTM” (PRINTING HOUSE) Main subjects areas of the Journal of Engineering Science: A. Industrial Engineering Mechanical Engineering and Technologies Applied Engineering Sciences and Management Materials Science and New Technologies Electrical Engineering and Power Electronics Energy systems Light Industry, New Technologies and Design Industrial and Applied Mathematics Vehicle and Transport Engineering B. Electronics and Computer Science Electronics and Communication Microelectronics and Nanotechnologies Biomedical Engineering Computers and Information Technology Automation C. Architecture, Civil and Environmental Engineering Architecture, Urbanism and Cadaster Civil Engineering and Management Energy Efficiency and New Building Materials Environmental Engineering D. Food Engineering Food Technologies and Food Processes Food Industry and Management Biotechnologies, Food Chemistry and Food Safety Equipment for Food Industries The structure of the journal corresponds to the classification of scientific publications: Engineering, Multidisciplinary. How to publish a paper: 1. Send the manuscript and information about the author to the Editorial Board address: [email protected] 2. Manuscripts are accepted only in English, by e-mail, in template file (www.jes.utm.md) 3. After a review, you will be notified of the editorial board's decision. 4. After the Journal has been published, we will send it to you immediately by mail. Editor-in-Chief Dr. hab. prof. univ. Viorel BOSTAN Technical University of Moldova [email protected] Editorial Board Abdelkrim Azzouz, Dr. Ing., Professor, Quebec University of Montreal, Canada Adrian Gheorghe, PhD, Professor Old Dominion University, Norfolk, Virginia, 23529, USA Adrian Graur, PhD, Professor University „Ștefan cel Mare”, Suceava, Romania Cornel Ciupan, PhD, Professor Technical University of Cluj Napoca, Romania Cristoph Ruland, PhD, Professor, University of SIEGEN, Germany Dimitr P. Karaivanov, Dr.Sc., PhD, Professor University of Chemical Technology and Metallurgy, Sofia, Bulgaria Dumitru Mnerie, PhD, Professor „Politehnica”University of Timișoara, Romania Dumitru Olaru, PhD, Professor Technical University „Gh. Asachi”, Iași, Romania Florin Ionescu, PhD, Professor University Steinbes, Berlin, Germania Frank Wang Professor of Future Computing, University of Kent, U.K. Gabriel Neagu Profesor Institutul Naţional de Cercetare-Dezvoltare în Informatică Bucureşti, George S. Dulikravich, PhD, Florida International University, U.S.A. Gheorghe Badea, Ph.Dr. in Engineering, Professor, Technical University of Civil Engineering Bucharest, Romania Gheorghe Manolea, PhD, Professor University of Craiova, Romania Grigore Marian, Dr.Sc., PhD, Professor Agrarian State University of Moldova, Chișinău, Republic of Moldova Hai Jiang, Ph.D. Professor, Department of Computer Science, Arkansas State University, U.S.A. Heinz Frank, PhD, Professor Reinhold Würth University. Germany Hidenori Mimura, Professor, Research Institute of Electronics, Shizuoka University, Japan Ion Bostan, Dr.hab., Acad. Academy of Science, Republic of Moldova Ion Paraschivoiu, PhD, Professor Universite Technologique de Montreal, Canada Ion Rusu, Dr. hab. Professor, Technical University of Moldova Ion Tighineanu, Dr.hab., Acad. Academy of Science, Moldova Ion Vișa, PhD, Professor University Transilvania of Brașov, Romania Jorj. Ciumac, Dr., Professor, Technical University of Moldova Laurenţiu Slătineanu, PhD, Professor Technical University „Gh. Asachi”, Iași, Romania Lee Chow, PhD, Professor, University of Central Florida, USA Leonid Culiuc, Dr.hab., Acad. ASM, Institute of Applied Physic Livia Nistor-Lopatenco, Ph.Dr. in Engineering, Associate Professor, Technical University of Moldova Mardar Maryna, Doctor of Technical Science, Professor, Odessa National Academy of Food Technologies, Odessa, Ukraine Mircea Bernic, Dr. hab., Professor, Technical University of Moldova Mitrofan Ciobanu, academic MAS, Dr.Sc.,PhD, Professor Tiraspol State University, Chișinău, Republic of Moldova Natalia Tislinschi, Dr., Ass. Professor, Technical University of Moldova Oleg Lupan Dr.hab. Professor, Technical University of Moldova Pavel Tatarov, Dr. hab., Professor, Technical University of Moldova Pavel Topală, Dr.Sc., PhD, Professor, State University „Aleco Russo” from Bălţi, Republic of Moldova Peter Lorenz, PhD, Professor University of Applied Science Saar, Saarbrucken, Germania Petru Cașcaval, PhD, Professor, ”Gheorghe Asachi” Technical University of Iasi, Romania Journal of Engineering Science December, 2019, Vol. XXVI (4) Petru Stoicev, Dr.Sc., PhD, Professor, Technical University of Moldova, Chișinău, Republic of Moldova Polidor Bratu, PhD, academic RATS, president ICECON S.A. București, Romania Radu Munteanu, PhD, Professor Technical University of Cluj Napoca, Romania Radu Sorin Văcăreanu, Dr. hab. Professor, Technical University of Civil Engineering Bucharest, Romania Sergiu Zaporojan Dr., Professor, Technical University of Moldova Spiridon Creţu, PhD, Professor Technical University „Gh. Asachi”, Iași, Romania Eden Mamut, PhD, Professor University „Ovidius” Constanţa, România Stanislav Legutko, PhD, Professor Poznan University of Technology, Poland Rafał Gołębski, Dr., Ass. Professor, Częstochowa University of Technology, Poland Stefan Tvetanov, Dr., Professor, University of Food Technologies, Bulgaria Ștefan-Gheorghe Pentiuc, Dr., Professor, University “Stefan cel Mare” of Suceava, Romania Svetlana Albu, Dr. hab. Professor, Technical University of Moldova Thomas Luhmann, Dr-Ing. habil. Dr. h.c. Professor, Jade University of Applied Sciences, Germany Tudor Ambros, Dr.Sc., PhD, Professor, Technical University of Moldova, Chișinău, Republic of Moldova Valentin Arion, Dr.Sc., PhD, Professor, Technical University of Moldova, Chișinău, Republic of Moldova Valentina Bulgaru, PhD, Assoc. professor, Technical University of Moldova, Chișinău, Republic of Moldova Valeriu Dulgheru, Dr.Sc., PhD, Professor, Technical University of Moldova, Chișinău, Republic of Moldova Vasile Tronciu Dr.hab. Professor, Technical University of Moldova Victor Ababii, Dr. Professor, Technical University of Moldova Victor Șontea Dr. Professor, Technical University of Moldova Vilhelm Kappel, PhD, Institute of Research INCDIE ICPE-CA, Bucharest, Romania Vladimir Zavialov, Dr. hab., Professor, National University of Food Technology, Ucraine Vladislav Resitca, Dr., Ass. Professor, Technical University of Moldova Yogendra Kumar Mishra, Dr. habil., Kiel University, Germany Yuri Dekhtyar, Professor, Riga Technical University, Riga, Latvia Responsible Editor: Dr. hab. Rodica STURZA Technical University of Moldova [email protected] Editorial Production: Dr. Nicolae Trifan Dr. Svetlana Caterenciuc Journal of Engineering Science December, 2019, Vol. XXVI (4) CONTENT Abstracts ......................................................................................................................................... 6 A. Industrial Engineering Ion Bolun Characterization of some apportionment methods ............................... 23 Application of the finite difference method to calculation of Vladimir Berzan dynamic processes in long electrical lines ............................................... 45 Titu-Marius I. Băjenescu Future trends in power electronic devices ............................................... 67 B. Electronics and Computer Science K. Prahlada Rao, Vani R. M., Two element microstrip antenna array using star slot P. V. Hunagund electromagnetic band gap structure .......................................................... 78 Andrei Bragarenco, Internet of things system for environmental map acquisition ........... 88 Galina Marusic V. S. Osipovich, A. L. Radnynok, M. N. Bychek, The algorithm, the software and the methodology of stress E. A. Melnikova, N. V. Shcherbina, tolerance assessment ...................................................................................... 103 R. Yu. Yakovenko, K. D. Yashin Badri Narayan Mohapatra, Omkar Dherange, Arduino and bluetooth based low cost prototype model for Akshay Bhamare, systematic floor cleaning ............................................................................... 111 Pritesh Deshmukh D. Food Engineering Viorica Bulgaru, Gelato quality characteristics manufactured from natural Liliana Popescu, 116 Iulia Bulat ingredients ......................................................................................................... Mircea Bologa, Elvira Vrabie, Ana Chiţanu, Laura Laiciuc, Irina Paladii, Recovery of proteine mineral concentrates from acid whey by Tatiana Stepurina, Valeria Vrabie, electro-activation ............................................................................................. 124 Olga Iliasenco, Albert Policarpov, Valeriu Gonciaruc, Catalina Sprincean History of engineering Constantin Buşilă - the founder of the Romanian institute of Gheorghe Manolea energy .................................................................................................................. 134 6 Journal of Engineering Science, Abstracts, Vol. XXVI (4), 2019 DOI: 10.5281/zenodo.3591578 CZU 004.94 CHARACTERIZATION OF SOME APPORTIONMENT METHODS Ion Bolun, ORCID ID: 0000-0003-1961-7310 Technical University