p r o g r a m - tugab.bg · p r o g r a m 15 - 16 november 2019 gabrovo ... 14.00 – 14.30 h...

International Scientific Conference “UNITECH 2019” – Gabrovo

TECHNICAL UNIVERSITY OF GABROVO

INTERNATIONAL

SCIENTIFIC CONFERENCE

P R O G R A M

15 - 16 NOVEMBER 2019 GABROVO

2019


International Scientific Conference UNITECH’19 is organized by the Technical University of

Gabrovo with the assistance of regional business establishments and companies. The conference is

a forum at which traditionally every year at the end of November lecturers and research workers

from home and abroad meet to promote the Development of Science and Education.

ORGANIZING COMMITTEE

Chairman: Assoc. Prof. Iliya Zhelezarov, Ph.D. Vice Rector in charge of Research and Development

Members: Prof. Jordan Maximov, D.Sc.

Prof. Anatoliy Aleksandrov, Ph.D.

Prof. Stoyan Kapralov, Dr. Sc.

Technical Assistant: Petya Peneva, MA

PROGRAM COMMITTEE

Chairman: Prof. Raycho Ilarionov, D.Sc. Technical University of Gabrovo, Bulgaria

Members:

Acad. Chavdar Rumenin, Bulgaria

Acad. Dragoljub Mirjanić, Rep. Srpska, B&H

Acad. Peter Kralchevski, Bulgaria

Acad. Tomislav Pavlović, Rep. Srpska

Corr. Mem. Dimitar Dimitrov, Bulgaria

Corr. Mem. Prof. Tony Spassov, Bulgaria

Prof. D.H.C. Yuriyi Kuznetsov, Dr. Sc., Ukraine

Prof. D.H.C. Nikolay Ganev, Ph.D., Czech Republic

Prof. Lothar Otto, Germany

Prof. Emil Kolev, Ph.D., Germany

Prof. Dr. phil. Ludwig Hilmer, Germany

Prof. Elena Kovalenko, Pd.D., Ukraine

Prof. Iurii Iaremchuk, Dr.Sc., Ukraine

Prof. Mihail Prokofiev, Ph.D., Ukraine

Prof. Igor Sazonov, Dr. Sc., Belarus

Prof. Rumen Daskalov, Dr. Sc., Bulgaria

Prof. Vasil Kavardjikov, Dr. Sc., Bulgaria

UNITECH’19 will be held on 15 and 16 November 2019

at the Technical University of Gabrovо


WORKING PROGRAM

OF THE SCIENTIFIC CONFERENCE

14th November 2019, Thursday

14.00 – 17.00 h Registration, Rectorat building

15th November 2019, Friday

08.00 – 10.30 h Registration, Rectorat building

10.30 – 11.00 h Opening ceremony – Library building, Conference hall

11.00 – 12.00 h "Industry 4.0 and the challenges to Higher Education"-

Prof. Georgi Todorov, D.Sc. Technical University of Sofia

12.00 – 13.00 h Lunch

13.00 – 18.00 h Thematic sessions

Electrical Engineering

Electronics and Sensors

Automation

Chemistry and Ecology

Communication Engineering and Technologies

Computer Systems

Computer Technologies

Information Security

Mathematics and Informatics

Design of Machines and Instruments

Technologies in Mechanical Engineering

Technologies in Textile Production

Mechatronics, Metrology and Quality Management

Hydraulics, Pneumatics and Heat Engineering

Economics and Finance

Organization and Management

Social Sciences and Humanities

Educational Technologies

Physics

14.00 – 14.30 h Information day Project BG05М20Р001-1.002-0023 Centre of

Competence “Smart Mechatronic, Eco- And Energy Saving

Systems And Technologies",(SMEEST)

14.30 Coffee break

15.00 -17.00 h Round table: Industry 4.0, Library building, Conference hall

19.00 h Formal dinner Restaurant Balkan Hotel

16th November 2019, Saturday

09.00 – 12.00 h Thematic sessions

http://unitech.tugab.bg/reload.php?m=11&s=21


THEMATIC SESSIONS

ELECTRICAL ENGINEERING

Chairmen: Assoc. Prof. Plamen Tsankov, Ph.D., Assoc. Prof. Svilen Rachev, Ph.D.

Building № 2A, Hall 2603

Beginning: 13.00 h.

The effect of different sky temperature models on the accuracy in the estimation

of the performance of a photovoltaic module Bojan Perović, Dardan Klimenta, Miroljub Jevtić, Miloš Milovanović Faculty of Technical Sciences, University of Priština in Kosovska Mitrovica, Kneza Miloša St. 7,

RS-38220 Kosovska Mitrovica, Serbia

Photovoltaic lighting in Serbia Tomislav Pavlović¹, Ivana Radonjić¹, Dragoljub Mirjanić², Darko Divnić² ¹University of Niš, Faculty of Sciences and Mathematics, Department of Physics, Str. Višegradska

33, 18000 Niš, Serbia

²Academy of Sciences and Arts of the Republic of Srpska, Str. Bana Lazarevića 1, 78000 Banja

Luka, Republic of Srpska, Bosnia and Herzegovina

Investigation of the oil/pressboard ratio effect on dielectric behaviour Fatih Atalar, Enes Uğur, Suat Bilgin, Aysel Ersoy Yılmaz, Mukden Uğur Istanbul University-Cerrahpaşa, Electric&Electronics Engineering

Development and setting up of an asynchronous drive - laboratory stand Vasil Dimitrov, Petko Kostadinov Todor Kableshkov University of Transport – Sofia

Method for operational identification of dynamic objects with fractional-

rational transfer function Vasil Dimitrov, Lyudmil Popov Todor Kableshkov University of Transport – Sofia

Battery charge regulation device for backup supply of photovoltaic LED lighting

system Plamen Tsankov, Petar Tsvyatkov, Milko Yovchev, Stoyo Platikanov Technical University of Gabrovo

Experimental determination of the stepper motor-controlled butterfly valve

characteristics Vojislav Vujičić1, Marko Šucurović1, Mihailo Bjekić2, Marko Rosić1, Miroslav Bjekić1 1University of Kragujevac, Faculty of Technical Science in Cacak 2Institute Mihajlo Pupin, Belgrade


Research and analysis of Earth faults in medium voltage power networks with

earthed neutral at different capacitive current Mediha Mehmed-Hamza, Plamen Stanchev Technical University of Varna

Coordinating of the settings of power lines overcurrent relay protection and bus

breakers in medium voltage electrical networks Mediha Mehmed-Hamza Technical University of Varna

An analysis of energy resources in Romania Adriana Tudorache, Liviu Marius Cîrțînă, Daniela Cîrțînă

University “Constantin Brâncusi” of Tg-Jiu, №1, Republicii Str., Tg-Jiu, 210135, Romania

Integrated systems for functional diagnostics and monitoring of the current

technical condition of induction motors for own needs in electric power plants Ivaylo Dimitrov Ivanov Technical University of Gabrovo

Methodical aspects of effectiveness evaluation of electric vehicles Dobrin Ganchev, Svilen Rachev, Milena Racheva Technical University of Gabrovo

Dielectric properties of the ferroceramics prepared by solid solutions of barium

stannate titanate Ivaylo Lazarov Technical University of Gabrovo

Experimental comparison of several flux estimation techniques in induction

machines Marko Rosić, Miroslav Bjekić, Marko Šućurović, Vojislav Vujičić University of Kragujevac, Faculty of Technical Sciences Čačak, Serbia

Measurement uncertainty of test station for measurement of energy efficiency of

electrical machines Branko Koprivica1, Marko Šućurović2, Alenka Milovanović1, Srđan Divac1 University of Kragujevac, Faculty of Technical Sciences Čačak ¹Department of Electrical and Electronic Engineering, 2Department of Power Engineering Svetog Save 65, 32000 Čačak, Serbia

Dispersion of pollutants at rovinari power plant Adriana Tudorache, Mihai Cruceru University “Constantin Brâncuşi” Tg-Jiu

Mobile LED system based on PV-system Hovorov Pylyp Paramonovich, Kindinova Anastasiiya Kostyantynivna, Romanova

Tetiana Ivanivna, Tereshchenko Yurii Petrovych O.M. Beketov National University of Urban Economy in Kharkiv


Study mode voltage booster transformer with thyristor control Hovorov Pylyp Paramonovich, Hovorov Vladlen Pylypovich – Kindinova, Anastasiiya

Kostyantynivna Omer Abdelrahim OM Beketov National University of Urban Economy in Kharkiv

Sources of current harmonics in electrical power installations of residential and

public buildings

Panayot Ivanov Yankov, Petyr Kolev Petrov, Georgi Tsonev Velev, Cvyatko Kolev

Varbov Technical University of Gabrovo

Currenт harmonics in electrical low voltage networks

Krasimir Marinov Ivanov¹, Tsvetan Trifonov Naumov²

¹Technical University of Gabrovo

²Kozloduy NPP

Self-starting engine with at short decrease and lack voltage Kiril Dzhustrov

University of Mining and Geology is “St. Ivan Rilski”

Digital relay protection of power transformers in steel factory Kiril Dzhustrov, Todor Nikolov, Ivan Stoilov

University of Mining and Geology is “St. Ivan Rilski”

Physical model for simulation of faults in electrical equipment with

asynchronous motors with the use of currenт signature analisis Yulian Yordanov, Valentin Gyurov

Technical University of Varna, Department of Electric Power Supply and Equipment

Charging stations for electric vehicles – situation in Bulgaria Svilen Rachev, Dimitrina Koeva, Lyubomir Dimitrov, Ivaylo Ivanov Technical University of Gabrovo

Research of a photovoltaic power plant connected at 20 KV grid Krasimir Marinov Ivanov, Georgi Tconev Velev, Petar Kolev Petrov Technical University of Gabrovo

Research break time of maximal current protection Tsvyatko Kolev Varbov

Technical University of Gabrovo

Energy dependency of a hybrid decentralized electro-thermal system from

power distibution grid

Y. Stefanov¹, H. Hinz², K. Ivanov¹ ¹Technical University of Gabrovo

²Frankfurt University of Applied Science


Application of methodоlogy for forecasting of energy consumption in trolleybus

transport Valentin Gyurov, Nikolay Bezhanov

Technical University of Varna, Department of Electric Power Supply and Equipment

Three-phase charging of 96 cells with monophase chargers Dimo Dimitrov Stefanov Technical University of Varna


ELECTRONICS AND SENSORS TECHNICS

Chairmen: Prof. Nikolay Madzharov, Ph.D., Sen. Assist. Goran Goranov, Ph. D

Building № 2, Hall 2311

Beginning: 13.00 h.

A design of the PID based temperature controller Aleksandar Žorić¹, Aleksandar Micić¹, Verica Vasiljević¹, Nikola Žorić² ¹Faculty of information technologies, Slobomir P University, R. Srpska-BiH

²Faculty of technical sciences University of Priština, Serbia

Application of the phase locked loop for the digital filtering of the pulse signals

periods Perišić Đurđe1, Miroslav Bojović2, Željko Gavrić1 1 Faculty of Information Technology, Slobomir P University, Slobomir, BiH 2 School of Electrical Engineering, University of Belgrade, Beograd, Serbia

Study and design of a series resonant DC-DC converter at phase-shift control Aleksandar Stoyanov Vuchev University of Food Technologies – Plovdiv

Classification and strategies of the methods for control of energy flows in

electric vehicles Gergana Vacheva, Nikolay Hinov

Technical University of Sofia, Faculty of electronic engineering and technologies

Challenges to the use of fuel cells in electric vehicles Gergana Vacheva, Nikolay Hinov

Technical University of Sofia, Faculty of electronic engineering and technologies

Simulation study of static magnetoelectric characteristics of a dual-collector

magnetotransistor Anatolii Aleksandrov¹, Kazolis Dimitrios Theodosius², Goran Goranov¹, Gergana

Mironova¹ ¹Department of Electronics, Technical University of Gabrovo

²International Hellenic University, Kavala, Greece

Reliability assessment of power thyristors used in power supplies for induction

heating technologies Prodan I. Prodanov, Dobroslav D. Dankov Technical University of Gabrovo

Problems in designing piezoelectric compression harvesters Rumyana Stoyanova, Dimo Kolev, Velimira Todorova



Mutual influences in the operation of converters in an electrical energy storage

system Krasimir Kishkin, Dimitar Arnaudov, Vladimir Dimitrov, Lachezar Nikolov

Technical University of Sofia, Bulgaria

Investigation of programmable converters in hybrid power supply system Vladimir Dimitrov, Georgi Zashev, Dimitar Arnaudov, Krasimir Kishkin

Technical University of Sofia, Bulgaria

Practical investigations of the frequency multiplexing method of simultaneous

contactless transmission of energy and information signals through common

inductivе link Lyudmil Petkov

Technical university of Gabrovo

In-plane magnetosensitive hall microsensor S. V. Lozanova Institute of Robotics at Bulgarian Academy of Sciences

System for underwater research S. V. Lozanova Institute of Robotics at Bulgarian Academy of Sciences

Design of a multifunctional sensor system Ivaylo Belovski¹, Anatoliy Aleksandrov² ¹Prof. Assen Zlatarov University

²Technical University of Gabrovo


AUTOMATION

Chairmen: Prof. Zvezditsa Nenova, Ph.D., Assoc. Prof. Dragomir Chantov, Ph.D.,


Beginning: 13.00 h.

Remotely monitored temperature and humidity data logger design Özcan ÇETİNKAYA¹, Hilmi KUŞÇU² ¹Keşan Vocational College, Trakya University Edirne 22800, TURKEY

²Engineering Faculty, Mechanical Engineering Department, Trakya University

Impedance characteristics of humidity sensing elements on v-doped TiO2

Zvezditza Nenova

Technical University of Gabrovo, 4 H.Dimitar Str., 5300 Gabrovo, Bulgaria

Measuring the consumption of electronic devices in a sleep mode with low-cost

DAQ device

Stefan Ivanov Technical University of Gabrovo

Optimization of control algorithm in small hydropower plant Sladjana Djurasevic, Uros Pesovic University of Kragujevac, Faculty of technical sciences in Cacak, Serbia

Gesture commands in home environment S. Stankov, S. Ivanov Technical university of Gabrovo

Obtaining oscillatory synchronization between two Van der Pol chaotic systems Dragomir Chantov, Hristina Stoycheva Technical University of Gabrovo

Syntesis of chaotic sinchronization scheme with projective synchronization

between 4-th order hyperchaotic systems Hristina Stoycheva, Dragomir Chantov


Automatic hot water system and heating of a building Dimitar Spirov, Nikolay Komitov University of Food Technologies – Plovdiv

Model predictive control of vibratory bowl feeder Georgi Mihalev, Stanimir Yordanov Technical University of Gabrovo


Process controller with integrated autotunig module Veselin Mitev, Stanimir Yordanov, Georgi Mihalev Technical University of Gabrovo

System for creating, organizing and processing of anonymous surveys in

education Aldeniz Rashidov

Technical University of Gabrovo, Bulgaria


COMUNICATION ENGINEERING AND TECHNOLOGIES

Chairmen: Assoc. Prof. Stanimir Sadinov, Ph.D., Sen. Assist. Krasen Angelov, Ph.D.


Beginning: 13.00 h.

Ber analysis using recommendations ITU G.821 and ITU G.826 Aleksandar Lebl¹, Dragan Mitić¹, Verica Vasiljević² ¹Institute for Telecommunications and Electronics, IRITEL a.d. BELGRADE, Serbia

²Faculty of Information Technology, University Slobomir P Bjeljina, Bosnia and Herzegovina

Error estimation for networks with higher data rates Aleksandar Lebl¹, Dragan Mitić¹, Verica Vasiljević² ¹Institute for Telecommunications and Electronics, IRITEL a.d. BELGRADE, Serbia


Estimation of the bit error rate and quality factor in optical systems Dragan Mitić¹, Aleksandar Lebl¹, Verica Vasiljević² ¹Institute for Telecommunications and Electronics, IRITEL a.d. BELGRADE, Serbia


Some advantages of multi-beam transmit diversity scheme in wireless

communication system Verica Vasilјevic¹, Hana Stefanovic², Slobodan Obradovic³, Ana Savicº ¹Faculty of Information Technology, University Slobomir P Bjeljina, Bosnia and Herzegovina

²Information Technology School Belgrade, Serbia

³Information Technology School, Belgrade, Serbia

School of Electrical and Computer Engineering of Applied Studies, Belgrade, Serbia

Electromagnetic parameters experimental determination of planar composite

structures Kliment Angelov ¹ Hristo Gelov², Sofia Anguelova¹, Yulia Vasenda¹

1Technical University of Sofia 2Sofia University „St. Kliment Ohridski“

Design algorithm of powerful last RF amplifying stage class F Stanimir Sadinov, Miroslav Tomov Technical University Gabrovo

Modelling and optimization of multichannel optical communication lines Krasen Kirov Angelov¹, Stanimir Mihailov Sadinov¹, Panagiotis Gregorios Kogias² ¹Technical University of Gabrovo, Bulgaria

²Technological Educational Institute of Eastern, Macedonia and Thrace, Kavala, Greece


Communication system for strain analysis over metals on the base of

tensoresistor transducers Stanimir Sadinov1, Dionisia Daskalaki1, Panagiotis Kogias2, Michail Malamatoudis2

1Technical University of Gabrovo, Bulgaria 2International Hellenic University, Greece

Challenges to the new radio-access network, implemented in 5G Teodor Iliev, Grigor Mihaylov, Elena Ivanova, Ivaylo Stoyanov University of Telecommunications and Post, 1 acad. Stefan Mladenov, Sofia 1700, Bulgaria

University of Ruse, 8 Studentska, Ruse 7017, Bulgaria

Bit error rate estimation and confidence levels Aleksandar Lebl¹, Dragan Mitić¹, Verica Vasiljević² ¹Institute for Telecommunications and Electronics, IRITEL a.d. BELGRADE, Serbia


Optical service provision network triple-play Emilia Dimitrova, Bozhidar Rozev Todor Kableshkov University of Transport – Sofia

Application of satellite navigation in the management of railway transport Emilia Dimitrova, Svetlin Stefanov Todor Kableshkov University of Transport – Sofia

Implementation of 5g FBMC phydyas prototype filter Trayan Ivanov1, Stanimir Sadinov1

1Technical University of Gabrovo, Bulgaria


COMPUTER SYSTEM

Chairmen: Assoc. Prof. Valentina Kukenska, Ph.D., Sen. Assist. Hristo Kilifarev, Ph.D.


Beginning: 13.00 h.

Comparative evaluation of lte simulators for purposes of education Aydan Haka Technical University of Varna, Bulgaria

Study of wireless networks security Hristo Valchanov, Veneta Aleksieva, Jan Edikyan Technical University of Varna, Bulgaria

Study of smart watch interfaces Veneta Aleksieva, Hristo Valchanov, Yuri Dimitrov Technical University of Varna, Bulgaria

Mathematical methods for analysis of physiological clinical data Galya Georgieva-Tsaneva¹, Krasimir Cheshmedzhiev¹, Nikolay Noev², Negoslav

Sabev² ¹Institute of Robotics, Bulgarian Academy of Sciences, Bulgaria

²Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, Bulgaria

Study of 6LOWPAN wireless sensor network simulators for purposes of

education Aydan Haka Technical University of Varna, Bulgaria

Modification of algorithm for global median thresholding Atanaska Bosakova-Ardenska, Angel Danev Dep. of Computer Systems and Technologies University of Food Technologies – Plovdiv

Database managment system selection

Stanišević Ilja¹, Slobodan Obradović², Mladjen Vićentić³

¹Valjevo Business School of Applied Studies, Valjevo, Serbia

²Faculty of Electrical Engineering East Sarajevo, Bosnia and Herzegovina

³Valjevo Business School of Applied Studies, Valjevo, Serbia

DBMS response speed testing system Stanišević Ilja¹, Slobodan Obradović², Mladjen Vićentić³

¹Valjevo Business School of Applied Studies, Valjevo, Serbia

²Faculty of Electrical Engineering East Sarajevo, Bosnia and Herzegovina

³Valjevo Business School of Applied Studies, Valjevo, Serbia


Lorawan based end node on computer system for the internet of food Krassimir Iliev Kolev1, Rositsa Raycheva Maksimova2, Atanas Nikolov Kostadinov3

1University of Food Technologies – Plovdiv 2University of Food Technologies – Plovdiv 3Technical University – Sofia, Plovdiv branch

Data exchange using WSO2 enterprise service bus Stefan Pitulić¹, Slaviša Ilić², Siniša Ilić¹ , Dragana Radosavljević¹ ¹Faculty of Technical Sciences, K. Mitrovica, University of Priština, Serbia

²Faculty of Informatics and Computing University Singidunum, Serbia

Implementation of recording log events in wso2 esb communication Stefan Pitulić¹, Siniša Ilić¹, Slaviša Ilić², Vladimir Veljovic³ ¹Faculty of Technical Sciences, K. Mitrovica, University of Priština, Serbia

²Faculty of Informatics and Computing University Singidunum, Serbia

³Faculty of Technical Sciences, Čačak University of Kragujevac, Serbia

Computer system for characterization of food foams with ultrasound Ivan Topalov¹, Nikolay Shopov¹, Tsvetelin Desev¹, Hristo Kilifarev² ¹University Of Food Technologies - Plovdiv

²Technical University of Varna

State, capabilities and prospects of computer systems for food quality evaluation Ivaylo Ivanov Dragnev University of Food Technologies – Plovdiv, Technical faculty, Department of Computer Systems

and Technologies

Hack computer: FPGA implementation and system programming support Duško Kovačević, Dejan Vujičić, Slađana Đurašević, Marina Milošević, Uroš Pešović University of Kragujevac, Faculty of Technical Sciences in Čačak, Serbia

Development of a processed meat dryer for home use based on an arduino

microcontroller Hristo Kilifarev1

1Technical University of Gabrovo, Bulgaria


COMPUTER TECHNOLOGIES

Chairmen: Assoc. Prof. Delyan Genkov, Ph.D., Assoc. Prof. Elena Zaharieva, Ph.D.


Beginning: 13.00 h.

End time reporting through horse transponders in endurance races Ruzha Nedkova-Ivanova National Sports Academy “Vasil Levski”- Sofia

Generating and solving of the maze by using Kruskal’s and Floyd’s algorithm Suzana Marković¹, Jasmina Novakovic¹, Anja Marković² ¹Academy of Business Applied Studies Belgrade ²Faculty of Electrical Engineering, Belgrade

A review on context data models for health care applications

Vanja Mišković¹, Željko Gavrić² ¹Faculty of information technology, SPU

²Faculty of organizational sciences, University of Belgrade

A data mining approach to wine quality prediction Dragana Radosavljević, Siniša Ilić, Stefan Pitulić Faculty of Technical Sciences of University in Pristina, Kosovska Mitrovica, Serbia

An approach for broken surface evaluation of white cheese in brine using

multidimensional images processing Angel Danev, Atanaska Bosakova-Ardenska University of Food Technologies – Plovdiv, Dep. Computer Systems and Technologies

Application of classification algorithms in breast cancer diagnosis Jasmina Novakovic, Suzana Marković Academy of Business Applied Studies Belgrade

System for reservation of excersises in virtual laboratory Delyan Genkov1, Zhulien Ivanov1

1Technical University of Gabrovo

Benefits of using eye tracking technology Željko Gavrić¹, Miroslav Minović¹, Vanja Mišković² ¹Faculty of Organizational Sciences University of Belgrade, Serbia

²Faculty of information technology, Slobomir P University, Republic of Srpska

Classification of decomposition algorithms Matyo Stefanov Dinev, Valentina Stoqnova Kukenska Technical University of Gabrovo


Process modeling in the linux operating system Valentina Kukenska, Matyo Dinev, Petar Minev, Ilian Varbov


Traffic management system for an internet service provider Delyan Genkov1, Georgi Bonev1

1 Technical University of Gabrovo


DESIGN OF MACHINES AND INSTRUMENTS AND

TECHNOLOGIES IN TEXTILE PRODUCTION

Chairmen: Prof. Galya Duncheva, D. Sc., Assoc. Prof. Angel Anchev, Ph.D.


Beginning: 13.00 h.

Transition metal nitrides: formation and characterization Stanislava Rabadzhiyska, Maria Ormanova, Dimitar Dechev,

Nikolai Ivanov, Peter Petrov Institute of Electronics „Akad. E. Djakov“, Bulgarian Academy of Sciences, Sofia, Bulgaria

Electron beam additive manufacturing of light metals Stefan Valkov, Peter Petrov Institute of Electronics, Bulgarian Academy of Sciences, Sofia, Bulgaria

Method for creation of elastic waves using vibrator Safarov J.E., Sultanova Sh.A., Samandarov D.I., Erkinov D.D. Tashkent State Technical University Named After Islam Karimov

Calculation of the period of constant speed of drying mass of transfer of forest

products Sultanova Sh.A., Safarov J.E., Asqarxujaev S.M. Tashkent State Technical University Named After Islam Karimov

Design variants modeling of the small-sized gantry-type milling machine Kuznietsov Yuriy¹, Gaidaienko Iurii², Krivchuk Yuriy¹ ¹National technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”

²Yalong Intelligent Equipment Group Co. Ltd., Wenzhou, Zhejiang province. People’s Republic of

China

Computer-aided engineering (CAE) approach in the bending analysis of a

composite beam Fatih KARAÇAM, Ferudun Doğuş YILMAZ Trakya University, Department of Mechanical Engineering, 22030, Edirne, Turkey

Determination of the basic parameters for the process of distribution of the edge

of the tubular workpiece with a radial support of the edge Olha Kholyavik, Roman Skotar, Volodimir Steblyuk, Ruslan Borys National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Ukraine

2


New design of combined electric machines to increase the efficiency of

processing composite materials Olga Chencheva¹, Schetinyn Viktor¹, Mohamed R.F.Budar¹, Valentina Gluchova² ¹Department of Industrial Engineering Kremenchuk Mykhailo Ostrohradskyi National University

Kremenchuk, Ukraine

²Department of Finance and Accounting Kremenchuk Mykhailo Ostrohradskyi National University,

Kremenchuk, Ukraine

On the use of water-ice jets in the purification operations of turbine units Tkachuk Vitalii¹, Salenko Oleksandr², Schetinyn Viktor¹ ¹Department of Industrial Engineering Kremenchuk Mykhailo Ostrohradskyi National University

Kremenchuk, Ukraine

²National technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute»; Kyiv, Ukraine

Research hardness of the TI – PS BS190 crystal system, obtained by magnetron

sputtering Polina Ilieva Milusheva – Mandadzhieva1, Dimitar Rusev Rusev2

1University „Prof. d-r Asen Zlatarov“, Burgas 2University „Prof. d-r Asen Zlatarov“, Burgas

Measurement of the reflection coefficient of moist materials at ultrahigh

frequencies Konstantyn Shevchenko1, Oleksiy Yanenko2, Mikhail Prokofiev3, Sergey Peregudov4,

Vasyl Kuz5, Stanislav Ustenko6

1 Igor Sikorsky Kyiv Polytechnic Institute 2 Igor Sikorsky Kyiv Polytechnic Institute 3 Igor Sikorsky Kyiv Polytechnic Institute 4 Igor Sikorsky Kyiv Polytechnic Institute 5 Ternopil Ivan Puluj National Technical University 6 Vadym Hetman Kyiv National Economic University

Surface treatment of Ti and Ti6Al4V with picosecond Laser Tsanka Dikova¹, Sergei Kulinich², Satoru Iwamori², Shigeru Yamaguchi² ¹Medical University of Varna, Bulgaria

²Tokai University, Japan

3


TECHNOLOGIES IN MECHANICAL ENGINEERING

Chairmen: Assoc. Prof. Hristo Metev, Ph.D., Sen. Assist. Kalin Krumov, Ph.D.


Beginning: 13.00 h.

Research processing with infrared heating cocoons of the silkworm Safarov J.E., Dadaev G.T., Samandarov D.I., Xasanova N. Tashkent state technical university named after Islam Karimov

Selection of optimal basic schemes in automatic design of fixtures for the

locating of workpieces during machining Hristo Metev, Ali Gitan Technical University of Gabrovo

A lıterature revıew of studıes on syngas cleanıng technologıes ın bıomass

gasıfıcatıon systems Bahar DİKEN¹, Dinçer AKAL² ¹Tekirdağ Namık Kemal University Department of Biosystem Engineering Tekirdağ / TURKEY

²Trakya University Department of Mechanical Engineering Edirne / TURKEY

Investıgatıon of losses affectıng the effıcıency of photovoltaıc panels Dinçer AKAL¹, Bahar DİKEN², Uğur AKYOL³ ¹Trakya University Department of Mechanical Engineering Edirne / TURKEY

²Tekirdağ Namık Kemal University Department of Biosystem Engineering Tekirdag / TURKEY

³Tekirdağ Namık Kemal University Department of Mechanical Engineering Tekirdag / TURKEY

Performance development by kaizen method and application in packaging

industry – A case study M. Tahir ALTINBALIK, Şahin KARAKAYA Trakya University, Department of Mechanical Engineering

Research hardness of the TI – PS BS190 crystal system, obtained by magnetron

sputtering Polina Ilieva Milusheva - Mandadzhieva

University „Prof. d-r Asen Zlatarov“, Burgas

Kinetics of boride layer growth in semi-permeable iron - carbon - copper

powder materials Ivan Vinev, Ivanka Miteva Technical University of Gabrovo

Research of the accuracy on planetary cylindrical gear teeth cut by gear-

hobbing machines Hristo Metev, Maria Koleva Technical University of Gabrovo

4


Electrotermostat design for room thermal comfort control Oktay HACIHAFIZOĞLU¹, Ömer Faruk SEL¹, Özcan ÇETİNKAYA¹, Erdem

YAZGAN² ¹The University of Trakya

²The University of İstanbul

Investigation of heat treated TI-6AL-4V plate with different power by laser Sencer S. KARABEYOĞLU, Olcay EKŞİ Kırklareli University, Engineering Faculty, Mechanical Engineering Department Kırklareli/

TURKEY

5


HYDRAULICS, PNEUMATICS AND HEAT ENGINEERING

Chairmen: Assoc. Prof. Hristo Hristov, Ph.D., Sen. Assist. Valentin Petkov, Ph.D.


Beginning: 13.00 h.

Movement of single solid impurities in the boundary Lear of a quasi-static two-

phase plane curren Part II Rumen Yankov

TU-Sofia, Kollege-Sliven

The analysis of interaction of inertia forces and mass forces which have

magnetic nature in unstable mechanical and biological flows

Mamedov A. N.¹, Stas S. V.², Honcharova Ya. A.¹, Yakhno O. M.¹ ¹National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”

²Cherkasy Institute of Fire Safety named after Chornobyl Heroes of National University of Civil

Defence of Ukraine

Modeling the aerodynamics of the blades of energy steam turbines V. Aftaniuk 1, B. Garagula 1, A. Kiris1, V. Spinov 2 1National University “Odessa Maritime Academy” 2Odessa National Polytechnic University

Analysis of inert gas systems of modern chemical tankers V. Aftaniuk 1, Al. Aftaniuk 1, A. Aftaniuk 1

1National University “Odessa Maritime Academy”

The character of the transfer phenomenon in the work processes of the

hydraulic damper Nochnichenko Ihor, Jakhno Oleg, Liberatskyi Ihor National technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Ukraine

Experimental study of a hydrogen generator with application modules of

ultrasonic cavitation and vibration oscillations Nochnichenko Ihor, Luhovskyi Oleksandr, Kostiuk Dmytro National technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Ukraine

Dynamic processes modeling in load sensing hydraulic driven system with

variable-displacement pump Borislav Georgiev Technical University of Gabrovo

Development of a measurement and control systems of knee joint exoprosthesis

based on magnetorheological damper Nochnichenko Ihor, Kostiuk Dmytro, Dovhopolyi Mykhailo National technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Ukraine

6


Analysis of compressor equipment operation of industrial system Maria Raykova, Ivaylo Tsvyatkov Technical university of Gabrovo

Investigation of the cavitating flow in converging-diverging nozzle Georgi Panchev1, Hristo Hristov1, Kaloyan Dachov2 1Technical University of Gabrovo 2M+S Hydraulic

7


MECHATRONICS, METROLOGY AND QUALITY

MANAGEMENT

Chairmen: Prof. Dimitar Dichev, D.Sc., Assoc. Prof. Dimcho Pulov, Ph.D.


Beginning: 13.00 h.

Contribution to defining the constraints of a mathematical model to optimize the

turning process Miroslav Radovanović University of Niš, Faculty of Mechanical Engineering

Risk management in quality management system Iliya Zhelezarov Technical University of Gabrovo

Control of 2D delta robot with siemens technology plc Bogdan Gajić¹, Miloš Božić², Vojislav Vujičić³, Miroslav Bjekić³, Srećko Ćurčić³ ¹Roking, Belgrade

²Vorwerk-autotec, Serbia, Čačak

³University of Kragujevac, Faculty of technical sciences, Čačak

Model for developing a virtual gauge basis for coordinate measurements for

straightness Rositsa Miteva Technical University of Sofia

Models for expert assessment for selection of forms for education Rositsa Miteva Technical University of Sofia

Study models to approximate the material standard use of a virtual mechanical

standard for straightness Rositsa Miteva Technical University of Sofia

Adaptive resolution of pseudorandom optical rotary encoder Goran Miljković, Dragan Denić, Milan Simić

University of Niš, Faculty of Electronic Engineering Aleksandra Medvedeva 14, 18000 Niš, Serbia

Pseudorandom binary arrays for position determination using virtual

instrumentation Ivana Stojković, Goran Miljković , Dragan Denić, Dragan Živanović University of Niš, Faculty of Electronic Engineering, Serbia

8


ECONOMICS AND FINANCE

Chairmen: Assoc. Prof. Dobrin Ganchev, Ph.D., Sen. Assist. Ventsislava Nikolova, Ph.D


Beginning: 13.00 h.

Influence and specifics of improvement process in management revenue

accounting of machine-building enterprises Ivan Nikolaev Sabev Technical University of Gabrovо

Dynamic analysis of time lines in the study of online entrepreneurship Antonia Lazarova European Higher School of Economics and Management – Plovdiv

Selection of categorical statistical signs in the survey cards Antonia Lazarova European Higher School of Economics and Management – Plovdiv

Enterpreneurship and digitalization of small and medium-sized enterprises Tsvetelina Gankova – Ivanova Technical University of Gabrovo

Areas of state regulation and market support of leasing services Demianchuk Marina¹, Rima Tamošiūnienė², Viktor Koval³, Sigitas Davidavičiusº ¹Odessa І.І. Mechnikov National University, Ukraine

²Vilnius Gediminas Technical University, Lithuania

³Odessa Institute of Trade and Economics of Kyiv National University of Trade and Economics,

Ukraine

ºVilnius Gediminas Technical University, Lithuania

Studying the consumption of some basic foods Delyana Dimova Agricultural University - Plovdiv, Bulgaria, Faculty of Economics

Analyzing the expenditure on tourist trips of Bulgarian citizens Delyana Dimova Agricultural University - Plovdiv, Bulgaria, Faculty of Economics

The impact of body language in the communication process Jürgen Gemeinhardt University of Applied Sciences - Schmalkalden, Germany

Cradle-to-cradle – concept for non-waste products Svetla Panayotova1, Jürgen Gemeinhardt2

1 Technical University – Gabrovo, Bulgaria 2University of Applied Sciences – Schmalkalden, Germany

9


Practical aspects of income and expense reports as an information base for

financial results analysis of the enterprise Ivan Nikolaev Sabev Technical University of Gabrovо

10


ORGANIZATION AND MANAGMENT

Chairmen: Assoc. Prof. Daniela Dimova, Ph.D., Sen. Assist. Petko Naydenov, Ph.D.


Beginning: 13.00 h.

About the role of the human factor in the management and the need to

overcome the crisis in its ethical-value system Neli Nikolova Technical University of Gabrovo

Economic development of the eu and the republic of Bulgaria during digital

transformation Desislava Ivanova Petrova1, Beata Plamenova Vlahova¹


Fourth industrial revolution - digital economy and skills of the future in

European Union Desislava Ivanova Petrova Technical University of Gabrovo

European central bank - policies and the impact on the economy in the Euro

Area and the republic of Bulgaria Hristo Ivanov Totev


Strategic solutions for the innovation of an integrated information logistics

system Veryana Boeva Technical University of Gabrovo

Reengineering of business processes in the digital age of Industry 4.0 Neli Nikolova Technical University of Gabrovo

Planning of personnel needs and sources for their recruitment Tsanka Zlateva-Petkova


Developing a program for creating a new product Tsanka Zlateva-Petkova


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SOCIAL SCIENCES AND HUMANITIES

Chairmen: Assoc. Prof. Svetla Panayotova, Ph.D., Sen. Assist. Plamen Kolev, Ph.D.


Beginning: 13.00 h.

Research on psychophysical training of rider in discipline endurance of

equestrian sport Yuri Valev¹, Vasil Dimitrov², Ruzha Nedkova-Ivanova¹ ¹National Sports Academy, Department of Technical and Ice Sports, Equestrian Sports Sector

²National Sports Academy, Department of Faculty of Sports, Department of Management and Sports History

Sector Management of Sport

Analysis of changes in social assistance system during the period 2009-2018 Lilyana Rusanova Technical University of Gabrovo

Understanding of the gender as an important problem of the theory of social

contract Usov Dmytro Cherkasy Institute of Fire Safety named after Chornobyl Heroes of the National University of

Civil Protection of Ukraine

Teaching social dsciplines in a technical institution of higher education (on the

example of cherkasy institute of fire safety named after chornobyl heroes of

national university of civil defence of Ukraine) Chubina Tetiana, Horenko Lesia, Kosiak Svitlana Cherkasy Institute of Fire Safety named after Chornobyl Heroes

Model for evaluation and measurement of efficiency in social services for

children and young people Plamen Kolev Department of Social and Economic Sciences, Technical University – Gabrovo

Energy literacy and behaviour: an approach from the perspective of the edee

policy Dragana Bjekić and Miroslav Bjekić University of Kragujevac – Faculty of technical sciences, Čačak, Serbia

National programs for prevention of socially significant diseases in Bulgaria Ivanka Stoyanova - Todorova Technical University of Gabrovo, Bulgaria

Application of solar panels in modern civil engineering Nikola Cekić University of Niš, Faculty of Civil Engineering and Architecture, Niš, Republic of Serbia

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Methodology for determining the quality of life - a basis for the ecessarymedico-

social cares for adults Petar Petrov¹, Yanka Markova² ¹Technical University of Gabrovo

²Medical University – Varna „Prof. Dr. Paraskev Stoyanov” Affiliate Veliko Tarnovo

Personnel state of the machine-building industry in gabrovo region Anton Antonov Technical University of Gabrovo, Bulgaria

Telemetric measurement of heart rate in working conditions Verislav Stanchev, Nadezhda Todorova National Center of Public Health and Analyses, Sofia, Bulgaria

Social-pedagogical study of the correlation between anxiety and location of

control in family type placement center of children and youth

Zhaneta Tsoneva


13


EDUCATION TECHNOLOGIES

Chairmen: Assoc. Prof. Diana Izvorska, Ph.D., Sen. Assist. Tsanka Zlateva, Ph.D.


Beginning: 13.00 h.

Using proverbs and sayings to successfully train different aspects of foreign

language learning Nadezhda Slavova Technical University of Gabrovo

The whole thruth about the effectiveness of focussing on speaking when learning

a foreign language Nadezhda Slavova Technical university of Gabrovo

Virtual communities in software testing learning: a case study

Olga Ristić¹, Stefan Šošić¹, Marjan Milošević¹, Sandra Milunović-Koprivica¹, Petar

Marić² ¹Faculty of Technical Science in Čačak, University of Kragujevac, Serbia

²Faculty of Technical Science in Novi Sad, University of Novi Sad, Serbia

M-learning at faculty of technical sciences čačak: an exploratory study from a

technology acceptance perspective Marjan Milošević, Olga Ristić, Maja Radović

University of Kragujevac, Faculty of Technical Sciences, Čačak, Serbia

Using of new technologies and serious games in education Galya Georgieva-Tsaneva Institute of Robotics, Bulgarian Academy of Sciences, Bulgaria

Power and efficiency determination of pat system using laboratory setup Marko Šućurović1, Vojislav Vujičić1, Mihailo Bjekić2, Marko Rosić1, Miroslav Bjekić1 1University of Kragujevac, Faculty of Technical Sciences in Čačak, Serbia 2Institute Mihajlo Pupin, Belgrade, Serbia

Nature, principles and methods of interactive training Minka Miteva Yordanova Technical University of Gabrovo, Bulgaria

Methodology for examining the nurse’s expertise and skills by devising real-life

situations Petar Petrov¹, Yanka Markova² ¹Technical University of Gabrovo

²Medical University – Varna „Prof. Dr. Paraskev Stoyanov” Affiliate Veliko Tarnovo

14


Evaluation of internet-based practical teaching in higher education

Tatijana Dlabač¹, Alenka Milovanović², Branko Koprivica², Martin Ćalasan³ Mladen

Janjić² ¹University of Montenegro, Faculty of Maritime Studies Kotor

²University of Kragujevac Faculty of Technical Sciences Čačak ³University of Montenegro Faculty of Electrical Engineering Čačak

Teamwork projects on the topic “Synthesis, analysis and estimation of code

converters in logisim” Adriana Naydenova Borodzhieva, Ivanka Dimitrova Tsvetkova University of Ruse “Angel Kanchev” Bulgaria

Investigating RF filters used in wireless communication systems for educational

purposes Ivanka Dimitrova Tsvetkova, Adriana Naydenova Borodzhieva University of Ruse “Angel Kanchev” Bulgaria

15


MATHEMATICS AND INFORMATICS

AND INFORMATION SECURITY

Chairmen: Assoc. Prof. Milena Racheva, D. Sc., Sen. Assist. Valentina Lazarova, Ph.D.


Beginning: 13.00 h.

Recursive brute-force selection operator in genetic algorithms Iliyan Zankinski, Delyan Keremedchiev, Ivan Blagoev, Rumen Ketipov, Kolyu Kolev,

Georgy Kostadinov, Plamen Petrov Institute of Information and Communication Technologies - Bulgarian Academy of Sciences

Stereoscopic application for students in stereometry (geometric shapes and edge

bodies) Penio Lebamovski, Emiliyan Petkov St. Cyril and St. Methodius University of Veliko Tarnovo, Faculty of Mathematics and Informatics

Department of Computer Systems and Technologies

Comparative analysis of mathematical models of number projection Inhabitants

of Europe for the 21st Century Danijela Antic1, Marjana Timotijevic1 1University of Nis, Faculty of Sciences and Mathematics Visegradska 33, Nis, Serbia

Rank tests Marjana Timotijevic1, Danijela Antic2 1University of Nis, Faculty of Sciences and Mathematics Visegradska 33, Nis, Serbia

Number of zero solutions of some canonical complex differential equations of the

second order with variable coefficient Jelena Vujaković1, Tanja Jovanović1, Nataša Kontrec1 University of Priština, Faculty of Sciences and Mathematics Lole Ribara 29, Kosovska Mitrovica,

Serbia

Zero search method for complex oscillating equation directly by direction Jelena Vujaković1, Nataša Kontrec1, Stefan Panić1 1University of Priština, Faculty of Sciences and Mathematics Lole Ribara 29, Kosovska Mitrovica,

Serbia

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Critical objects information security infrastructures in the conditions of the

information war Mikhailo Prokofiev1, Liudmyla Skachek2, Vladimir Khoroshko3, Valentina Ovod4

1Igor Sikorsky Kyiv Polytechnic Institute, 2National Academy of Internal Affairs of Ukraine 3National Aviation University 4Kiev Electromechanical College

Characteristic of sea and river ports as objects of critical infrastructure of the

state Olena Azarenko1, Julia Goncharenko2, Mikhailo Diviziniuk3, Oleg Miroshnik4, Evgen

Tishchenko5

1National Aviation University - Kyiv 2University of Europe - Kyiv 3State institution “Institute of Environmental Geochemistry of the NAS of Ukraine” - Kyiv 4Cherkasy Fire Safety Institute named after Heroes of Chernobyl National University of Civil

Protection of Ukraine - Cherkasy 5Educational-methodical center of civil protection and life safety of Cherkasy region - Cherkasy

17


CHEMISTRY AND ECOLOGY

Chairmen: Assoc. Prof. Pencho Stoychev, Ph.D., Sen. Assist. Dragomir Vasilev, Ph.D. Building № 1, Hall 1314 Beginning: 13.00 h.

Aliphatic esters of oleic acid - elucidation of esterification process in ultrasound

field Dragomir Vassilev¹ , Nadezhda Petkova², Milena Koleva¹, Panteley Denev² ¹Technical University of Gabrovo ²University of Food Technologies Plovdiv

Application of ultrasonic energy in green chemistry and optimization of pre-

esterification for production of sucrose palmitate Dragomir Vassilev¹ , Nadezhda Petkova², Milena Koleva¹, Panteley Denev² ¹Technical University of Gabrovo ²University of Food Technologies Plovdiv

Design and monitoring of primary battery selection system in moravica district

of republic of Serbia Milan Vesković1, Neda Nikolić1, Brankica Šutić1, Miloš Papić1, Miodrag Zečević2 ¹University of Kragujevac, Faculty of Technical Sciences in Čačak

²European University, Belgrade, Faculty of International Engineering Management

Changing aquatic ecological systems of the foothills of the Dniester river basin

under anthropogenic loading Volodymyr Snitynskyi¹, Petro Khirivskyi¹, Ihor Hnativ¹, Oleh Yakhno², Roman

Hnativ³ ¹Lviv National Agrarian University

²Igor Sikorsky Kyiv Polytechnic Institute

³National University "Lviv Polytechnic"

Evaluation of solvent effect on the permeate flux and stability through

nanofiltration membranes Iliyan Trayanov, Ilonka Saykova Department of Chemical Engineering, University of Chemical Technology and Metallurgy

Antioxidative activity of black tomatoes Milan Vesković1, Jelena Mladenović2, Milena Đurić2, Ljiljana Bošković-Rakočević2,

Duško Brković2, Nenad Pavlović3, Jasmina Zdravković3 1Faculty of Technical Sciences Čačak, University of Kragujevac, Serbia 2Faculty of Agronomy, University of Kragujevac, Serbia 3Institute for Vegatable Crops, Smederevska Palanka, Serbia

Electrochemical analysis of the air cathodes for application in MFC

Blagovesta Midyurova Prof. D-R Asen Zlatarov University

18


Drinking water status in Gabrovo municipality Pencho Stoychev Technical University of Gabrovo

Study of the level of wastewater treatment in the municipality of Gabrovo Pencho Stoychev Technical University of Gabrovo

Production possibilities of pellets from residues when pruning raspberries and

blackberries

Srećko Ćurčić1, Mališa Žižović1, Sandra Milunović Koprivica1, Miloš Božić1, Dragan

Turanjanin2 1Faculty of Technical Sciences in Čačak, University of Kragujevac, Serbia 2Academy of Business Professional Studies, Belgrade, Serbia

Research on water quality of Varna Lake (June-August 2019) Diyana Dimova1, Daniela Toneva2

1,2Technical University of Varna, Department of Ecology and Environmental Protection

Comparative studies on the determination of specific surface area of solids by

adsorption of different gases Denitza Zgureva, Silviya Boycheva, Kalin Filipov Technical University of Sofia

19


PHYSICS

Chairmen: Sen. Assist. Nikolay Angelov, Ph.D., Sen. Assist. Daniela Nedeva, Ph.D.


Beginning: 13.00 h.

The structural properties of liquid iridium: the effect of cooling rate Unal Domekeli Dept. of Physics, Trakya University, 22030, Edirne – TURKEY

A molecular dynamics simulations study of the thermal and structural

properties of palladium nanofilms Unal Domekeli¹, Murat Celtek² ¹Dept. of Physics, Trakya University, 22030, Edirne - TURKEY

²Faculty of Education, Trakya University, 22030, Edirne – TURKEY

The structural evolution of liqud PB nanoparticle during solidification process Murat Celtek¹, Unal Domekeli², Sedat Sengul² ¹Faculty of Education, Trakya University, 22030, Edirne - TURKEY

²Dept. of Physics, Trakya University, 22030, Edirne – TURKEY

An investigation of the effects of pair potentials on the atomic development and

melting point of magnesium metal during the heating process Murat Celtek¹, Unal Domekeli² ¹Faculty of Education, Trakya University, 22030, Edirne - TURKEY


The effects of the cooling rates on microstructure of AL60CU40 metallic liquid:

atomic simulations Sedat Sengul¹, Unal Domekeli² ¹Dept. of Physics, Trakya University, 22030, Edirne – TURKEY


A classical molecular dynamic simulation study on the structural evolution and

dynamic properties of AL66.7AG33.3 metallic liquid during rapid solidification Sedat Sengul¹, Unal Domekeli² ¹Dept. of Physics, Trakya University, 22030, Edirne – TURKEY


Gama spectrometric analysis of sands collected from the northern Black Sea of

Bulgaria Nina Arhangelova, Sabina Vasileva, Seniha Salim, Borislava Pavlova, Hristo Hristov Shumen University “Konstantin Preslavsky”

Allelopathic activity and content of radionuclides of Hedera Helix (Araliaceae) Borislaba Pavlova, Hristo Hristov, Seniha Salim, Zheni Dimirtova, Nina Arhangelova Shumen University “Konstantin Preslavsky”

20


Radionuclide content and their impact on testate amoebae (Amoebozoa,

Rhizaria) in dams from ortheastern Bulgaria Nina Arhangelova, Rositsa Davidova Shumen University “Konstantin Preslavsky”

Gama-spectrometric analysis of soils from park "Kyoshkove" Nina Arhangelova, Seniha Salim, Hristo Hristov, Borislava Pavlova Shumen University “Konstantin Preslavsky”

Influence of the step and frequency on laser marking by melting of products of

steel 41Cr4 Nikolay Angelov


The binding energy and self-polarization of 2p-bound state of a hydrogenic

impurity in a GaAs/AlAs spherical quantum dot Ali Ihsan Mese Department of Physics, Trakya University, Edirne-22030, Turkey

Influence of the speed and frequency on laser marking by vaporization of

products of steel 41Cr4 Nikolay Angelov


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