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MACHINES.TECHNOLOGIES.MATERIALS’21 XVIIITH INTERNATIONAL CONGRESS

PROGRAM

ORGANIZER: SCIENTIFIC-TECHNICAL UNION OF MECHANICAL ENGINEERING

08.09 – 11.09. 2021 Varna,

PROGRAM

06.09.2021 (MONDAY)

16:00 – 20:00 REGISTRATION IN FRONT OF CONFERENCE HALL №1

07.09.2021 (TUESDAY)

08:00 – 17:00 REGISTRATION IN FRONT OF CONFERENCE HALL №1

OPENING OF THE CONFERENCE 10:00 “MATERIALS SCIENCE. NON-EQUILIBRIUM CONFERENCE HALL №1 PHASE TRANSFORMATIONS“

08.09.2021 (WEDNESDAY)

16:00 – 20:00 REGISTRATION IN FRONT OF CONFERENCE HALL №1

09.09.2021 (THURSDAY)

08:00 – 10:00 REGISTRATION IN FRONT OF CONFERENCE HALL №1 CONFERENCE HALL №1 10:00 – 10:15 OPENING OF THE CONGRESS 10:15 – 12:15 PLENARY SESSION

12:15 – 12:30 COLLECTIVE PICTURES OF THE PARTICIPANTS ON THE STAIRS TO THE POOL

13:00 - 14:00 LUNCH BREAK (NO LUNCH PROVIDED)

CONFERENCE HALL №1 14:00 – 16:00 SECTION “TECHNOLOGIES & MATERIALS” 16:00 – 16:30 COFFEE BREAK - CONFERENCE BAR 16:30 – 17:30 SECTION “MACHINES”

19:30 – 24:00 “WELCOME” COCKTAIL - CONFERENCE BAR

10.09.2021 (FRIDAY)

10:00 CLOSING OF THE CONGRESS - WINE AND CHEESE PARTY CONFERENCE BAR

2 time for presentation 10-12 minutes, questions after each presentation SCIENTIFIC PROGRAM

OPENING OF THE CONGRESS 09.09.2021 CONFERENCE HALL 1 10:00 – 10:15 CHAIRMAN: PROF.D.Sc. G. POPOV

09.09.2021 PLENARY SESSION CONFERENCE HALL 1 10:15 – 12:15

CHAIR: PROF. DR. GALINA NIKOLCHEVA (BG) Gennadii Bagliuk, Miroslav Marich, Alla Mamonova, Yulia Shishkina, HIGH-ENTROPY ALLOY OF FE-TI-CR-MN-SI-C Galina Molchanovska, Stepan 1 SYSTEM, PRODUCED BY HOT FORGING FROM Kyriliuk 31 UA POWDER MIXTURES OF FERROALLOYS Frantsevich Institute for Problems in Materials Science, NAS of Ukrane, Kyiv PITTING FACTOR IN USE OF GALVANOSTATIC Prof. Dr. Eng. Davor Grandić, Prof. PULSE METHOD FOR MEASURING THE Dr. Eng. Ivana Štimac Grandić 2 22 HR CORROSION RATE OF REINFORCEMENT IN Faculty of Civil Engineering, CONCRETE University of Rijeka Prof.Dr. Nadir Ayrilmis RECENT APPLICATIONS OF NANOPARTICLES IN Department of Wood Mechanics 3 52 TR WOOD-BASED PANELS and Technology, Forestry Faculty, Ilir Doci, Shaban Buza, Albert Isufi INFLUENCE OF TROLLEY MOTION IN THE Faculty of Mechanical Engineering, 4 38 KO DYNAMIC BEHAVIOR OF SEMI-PORTAL CRANES University of Prishtina “Hasan Prishtina” Galyna Zhavoronkova, Volodymyr CURRENT TRENDS IN THE WORLD MARKET OF Zhavoronkov, Darina 5 62 UA PRECIOUS METALS Melenevskaya, Irina Panasiuk, National Aviation University, Kyiv

12:15– 12:30 COLLECTIVE PICTURES OF PARTICIPANTS THE STAIRS TO THE POOL

12:30 - 14:00 LUNCH BREAK (NO LUNCH PROVIDED)

09.09.2021 SESSION “TECHNOLOGIES&MATERIALS” CONFERENCE HALL 1 14:00 – 16:00

CHAIRMAN: PROF. GENNADII BAGLIUK (UA) CO-CHAIRMAN: PROF. DAVOR GRANDIĆ (HR)

HEAT GENERATED IN THE PROCESS OF Assoc. Prof. Dr. Badea Lepadatescu, 6 Lecturer Dr. Flavia Fechete 04 RO ABRASION Transylvania University of Brasov DEVELOPMENT OF DUAL-FUNCTION MATERIALS BY UTILIZATION OF COAL COMBUSTION BY- Silviya Boycheva, Denitza Zgureva- 7 Filipova 53 BG PRODUCTS FOR CO2 CAPTURE AND Technical University CONVERSION INTO SYNTHETIC FUEL

3 time for presentation 10-12 minutes, questions after each presentation G. S. Dyakonov, O.B. Kulyasova, T. V. UTRAFINE-GRAINED STRUCTURE AND THERMAL Yakovleva, A. G. Stotskiy 8 STABILITY OF THE TWO-PHASE TITANIUM ALLOY Institute of Physics of Advanced 28 RU VT8M-1 Materials, Ufa State Aviation Technical University Igor Medved, Petar Mijić ADVANTAGES AND DISADVANTAGES OF Faculty of Mining, Geology and 9 58 HR FIBERGLASS CASING IN OIL AND GAS WELLS Petroleum Engineering – Petar Mijić, Igor Medved, Sven Mijić DECREASING PRESSURE LOSSES BY APPLYING Faculty of Mining, Geology and 10 59 HR DRILLING MUD WITH NANOPARTICLES Petroleum Engineering – University of Zagreb Prof.Dr. Nadir Ayrilmis ADVANCES IN REDUCING FORMALDEHYDE Department of Wood Mechanics and 11 65 TR EMISSION FROM WOOD-BASED PANELS Technology, Forestry Faculty, Istanbul University

16:00 – 16:30 COFFEE BREAK - CONFERENCE BAR

09.09.2021 SESSION “MACHINES” CONFERENCE HALL 1 16:30 – 17:30 CHAIRMAN: PROF. ILIR DOCI (KO) CO-CHAIR: PROF. NADIR AYRILMIS (TR) Delyan Gospodinov1, , Vilhelm Hdjiiski1, 1 2 THIN LAYER ACTIVATION METHOD. POTENTIAL Stefan Dishliev , Severin Traian-Lucian University For Food Technologies, BG 12 APPLICATIONS AND BENEFITS FOR THE FOOD 26 Plovdiv, Bulgaria1 RO PROCESSING INDUSTRY. "Stefan cel Mare" University of Suceava, Romania2 Prof. Asoc. Dr. Shpetim Lajqi, MSc. IMPACT OF THE NUMBER OF PASSENGERS IN Agron Syla, Prof. Dr. Naser Lajqi, Dr. THE VEHICLE BRAKING PERFORMANCES sc. Gazmend Krasniqi 13 50 KO EQUIPPED WITH MODERN MECHATRONICS University of Prishtina “Hasan BRAKING SYSTEM Prishtina”, Faculty of Mechanical Engineering Zafer Kahraman1, Soner Gürcü1, Murat Hacı1, Hakan Serhad Soyhan2,3 1 A NEW COMMERCIAL DISHWASHER DESIGN Öztiryakiler Madeni Eşya San. Ve Tic. A.Ş, R&D Technology Center, İstanbul 14 USING MINERAL ADDITIVES IN ITS DRYING 54 TR 2Sakarya University, Faculty of SYSTEM Engineering, 3 Team-San Ltd. Sti., Esentepe Campus, Sakarya University Zafer Kahraman1, Barış Taşkıran1, Murat Hacı1, Hakan Serhad Soyhan2,3 1Öztiryakiler Madeni Eşya San. & Tic. A NEW BLOOD STORAGE REFRIGERATOR A.Ş, R&D Technology Center, İstanbul 15 55 TR DESIGN FOR ATEX DIRECTIVE 2Sakarya University, Faculty of Engineering, 3 Team-San Ltd. Sti., Esentepe Campus, Sakarya University Sanjin Troha1, Dimitar Karaivanov2, Željko Vrcan1, Kristina Marković1, COUPLED TWO-CARRIER PLANETARY GEARBOXES Antonio Šoljić1 BG 16 10 FOR TWO-SPEED DRIVES 1University of Rijeka, Croatia HR 2University of Chemical Technology and Metallurgy, Bulgaria 4 time for presentation 10-12 minutes, questions after each presentation 19:30 – 24:00 “WELCOME” COCKTAIL CONFERENCE BAR

POSTER SESSION

THURSDAY (09.09) 10:00 – 19:00 POSTER SESSION “MACHINES” CONFERENCE HALL 1

FRIDAY (10.09) 09:00 – 13:00

Aylin Aliosmanova1, Sanjin Troha2, Dimitar Karaivanov1 A HOISTING MECHANISM OF CLAMSHELL CRANES BG 17 1University of Chemical Technology 06 WITH A PLANETARY GEAR TRAIN HR and Metallurgy, Bulgaria 2University of Rijeka, Croatia MSc Milica Josimovic, Prof. Dr Slavica Prvulovic, Prof. Dr. Sasa Jovanovic, THE IMMOVABLE MIXERS FOR THE DOSING OF THE Prof. Dr. Dragica Radosav 18 21 RS SUBSTRATE ON THE BIOGAS PLANTS , Technical Faculty “Mihajlo Pupin“, Zrenjanin, Serbia Delyan Hristov (PhD) EGR OPERATED ENGINES PROCESS WATER 19 Nikola Vaptsarov Naval Academy - 41 BG EQUIPMENT OPERATIONAL SAFETY PROCEDURE Varna TECHNOLOGY AND FIXTURE FOR ASSEMBLING OF Asst. Prof. Dr Stankov N. 20 44 BG FLANGES FOR CRANE COLUMNS University of Ruse, Ruse ANALYTICAL AND NUMERICAL ANALYSIS OF SHAFTS' Ćulafić Stefan, Bajić Darko 21 STRESS AND STRAIN STATES OF THE HYDRO-POWER Faculty of Mechanical engineering - 45 ME UNIT

THURSDAY (09.09) 10:00 – 19:00

POSTER SESSION “MATERIALS” CONFERENCE HALL 1

FRIDAY (10.09) 09:00 – 13:00

Lead. Res., Dr. Semenov Vladimir1+, VIRTUAL ESTIMATION OF THE INTENSITY OF Prof. Lin Hsin-Chih2., Jun. Res. DEFORMATION WHEN PRODUCING SAMPLES Kodirov Ilyas1 RU 22 1 09 FROM A MAGNESIUM ALLOY OF THE Ufa State Aviation Technical TW COMPOSITION Mg-1% Ca BY SPD METHODS University, Ufa, Russia ACCORDING TO ECAP AND HPT SCHEMES 2National Taiwan University, Taipei, Taiwan Assoc. Prof. Rasa Kandrotaitė 1 INVESTIGATION OF THE CAUSES OF CORROSION Janutienė PhD , Lect. Darius Mažeika PhD1 23 OF GALVANIZED STEEL PIPES USED FOR HOT 08 LT Faculty of Mechanical Engineering WATER SUPPLY and Design – Kaunas University of Technology1 Prof. Dr. Eng. Petrov Evgenii1, Postgraduate Student, Vetrova Anastasia1, Director, Pribavkin MICROCRYSTALLITES, GRANULARITY AND Andrey2, Engineer, Udalova Anastasia2 24 AGGLOMERATES OF DETONATION 17 RU NANODIAMONDS 1Biysk Technological Institute of Altai State Technical University named after I.I. Polzunov, Biysk city 2“CLL Research and Production Enterprise "SIDAL", Kachkanar city 5 time for presentation 10-12 minutes, questions after each presentation Ph.D.eng.Ardeleanu Mircea- Emilian1, eng.Scornea Aurelia2, Ph.D.eng.Stănescu Dan- ANALYSIS OF THE INFLUENCE OF Gabriel1,Ph.D.eng.Sîrbu Ioana- ENVIRONMENTAL FACTORS ON THE Gabriela1, eng.Buligioiu Alexandru1 25 20 RO PROPERTIES OF CELLULOSIC ELECTRICAL University of Craiova,Romania1 INSULATING MATERIALS National Research, Development and Testing Institute for Electrical Engineering - ICMET Craiova, Romania2 Syzonenko Olha, Torpakov Andrii, THE IMPACT OF HIGH VOLTAGE ELECTRIC Lypian Yevhen, Prystash Mykola Institute of Pulse Processes and 26 DISCHARGE TREATMENT ON THE PROPERTIES 24 UA Technologies of the National OF CU – AL POWDER MIXTURE Academy of Sciences of Ukraine – Mykolaiv Ph.D. Vladislav Kaverynskyi, eng. ESTIMATION OF THE ELASTICITY MODULE OF Zoya Sukhenko , Prof. dr. Gennadii AL-SI ALLOY SAMPLES IN CAST AND DEFORMED Bagliuk 27 32 UA STATES BY THE FREQUENCY SPECTRUM OF Frantsevich Institute for Problems SOUND VIBRATIONS in Materials Science, NAS of Ukrane, Kyiv Avdeychik Sergey1, THE CONCEPT OF ENERGETIC AND Antonov Alexander2, TECHNOLOGICAL COMPLIANCE OF Lesun Alexander2 28 34 BY COMPONENTS IN MATERIALS SCIENCE OF Molder Ltd1, FLUORINE COMPOSITES Yanka Kupala Grodno State University2 Avdeychik Sergey 1, Goldade Victor 2, Antonov Alexander 3, Struk Vasily 3, Klochko Pavel 3 THE NANOSTATE FACTOR IN THE TECHNOLOGY Molder Ltd1 – Grodno, Belarus, 29 35 BY OF POLYMER NANOCOMPOSITES Francisk Skorina Gomel State University2 – Gomel, Belarus, Yanka Kupala Grodno State University2 – Grodno THE METHODOLOGY OF FUNCTIONAL Avdeychik Sergey 30 MODIFIERS CHOICE FOR NANOCOMPOSITES 36 BY Molder Ltd – Grodno, Belarus BASED ON INDUSTRIAL THERMOPLASTICS THE PRACTICAL APPLICATIONS OF THE CONCEPT OF ENERGY AND TECHNOLOGICAL Avdeychik Sergey 31 37 BY COMPLIANCE IN MATERIALS SCIENCE OF Molder Ltd – Grodno, Belarus POLYMER NANOCOMPOSITES CHEMICAL COMPOSITION IMPACT ON Marzena Tokarewicz, Małgorzata 32 TRIBOLOGICAL PROPERTIES OF ALXCOCRFENI Grądzka-Dahlke, Maciej Wróbel 40 PL HIGH-ENTROPY ALLOYS. Bialystok University of Technology PREPARATION OF SPECIMENS FOR STANDARD Tatjana M. Lazović, Milan S. Stojanović 33 TENSILE TESTING OF PLASTIC MATERIALS FOR 43 RS , Faculty of FDM 3D PRINTING Mechanical Engineering, Belgrade

6 time for presentation 10-12 minutes, questions after each presentation Syzonenko Olha1, 2, Dubovyi Oleksandr2, Makrukha Tetiana2, Karpechenko Anton2, Bobrov Maksym2, Torpakov Andrii1 STATE AND PROSPECTS OF APPLICATION OF Institute of Pulse Processes and 34 PLASTICALLY DEFORMED NANOSTRUCTURED Technologies of the National 47 UA METALS, ALLOYS, AND SPRAYED COATINGS Academy of Sciences of Ukraine – Mykolaiv, Ukraine 1 Admiral Makarov National University of Shipbuilding – Mykolaiv, Ukraine 2 OPERATIONAL CHARACTERISTICS OF Auchynnikau Y. 35 Yanka Kupala State University of 48 BY NANOCOMPOSITE LUBRICANTS Grodno INVESTIGATION OF THE COALESCENCE OF TWIN Ivan Pidgurskyi, Mykola Stashkiv, COPLANAR SEMI-ELLIPTICAL FATIGUE CRACKS Mykola Pidgurskyi, 36 49 UA IN STRUCTURAL STEEL ELEMENTS UNDER Ternopil Ivan Puluj National CYCLIC LOADING Technical University

THURSDAY (09.09) 10:00 – 19:00 POSTER SESSION “TECHNOLOGY” CONFERENCE HALL 1 FRIDAY (10.09) 09:00 – 13:00 Assoc. Prof.Lezhnev S.N.1; DSc Prof. 1 RADIAL-SHEAR ROLLING AS A NEW Naizabekov A.B. ; PhD Volokitina I.E.1, PhD Panin E.A.2 37 TECHNOLOGICAL SOLUTION FOR RECYCLING 01 KZ 1 Rudny industrial institute, Rudny, BAR SCRAP OF FERROUS METALS 2 Karaganda industrial University, Temirtau, ABOUT THE POSSIBILITY OF LOCAL LASER Prof.. Dr. Sci. Svetlana Gubenko 38 HARDENING OF THE TREED OF RAILWAY National Metallurgical academy of 02 UA WHEELS Ukraine, Dnepr Yavor Lukarski, Hristo Argirov ECOLOGICAL ASPECTS OF METALLURGY AND Institute of metal science, equipment and technology with 39 MECHANICAL ENGINEERING AT THE BEGINNING 05 BG Centre of hydro and aerodynamics, OF THE 21ST CENTURY Bulgarian Academy of Science, Sofia Bartosz Dziejarski, Anna Kisiela- KINETIC AND EQUILIBRIUM STUDY OF THE CO2 Czajka 40 07 PL ADSORPTION ON ACTIVATED CARBON Wroclaw University of Science and Technology, Poland BSc Monika Fidanchevska, MSc Bojan Mitev, BSc Kristina Micova, DESIGN AND MECHANICAL PROPERTIES OF BSc Marko Naseski, Prof. Atanas 41 HIGH-VOLTAGE TRANSMISSION LINE Kochov 12 NM COMPOSITE INSULATORS Ss. Cyril and Methodius University in Skopje, Faculty of Mechanical Engineering, Skopje, c.t.s. Lezhnev S.1, d.t.s., prof. Naizabekov A.1, PhD Panin E.2, c.t.s. Kuis D.3, c.t.s. Stepankin I.4 1Rudny industrial Institute, DEVELOPMENT AND COMPUTER SIMULATION Kazakhstan; KZ 42 2 13 OF A NEW FORGING TECHNOLOGY WITH AN Karaganda Industrial University, BY ADDITIONAL MACRO-SHIFT Kazakhstan; 3Belarusian State Technological University, Minsk, Belarus 4Pavel Sukhoi State Technical University of Gomel, Belarus 7 time for presentation 10-12 minutes, questions after each presentation Andrey Volokitin1, Andrey Tolkushkin2, Evgeniy Panin3, Irina Volokitina1 1 DEVELOPMENT AND COMPUTER MODELING OF Rudny industrial Institute Kazakhstan KZ 43 A NEW FORGING TECHNOLOGY IN STEP-WEDGE 14 2Ural Federal University named RU STRIKERS after the First President of Russia B. N. Yeltsin, Ekaterinburg, Russia 3Karaganda Industrial University, Kazakhstan Krzysztof Ewertowski, Krzysztof DYNAMIC MESH ADAPTION IN SHOCKWAVES Czajka 44 18 PL SIMULATIONS Wroclaw University of Science and Technology Mag. Eng. Zaekova R. S. Institute of Metal Science Equipment METHODS FOR FRICTION STIR WELDING – and Technologies with 45 ADVANTAGES, PROBLEMS AND APPLICATIONS Hydroaerodynamics Centre ”Acad. A. 25 BG (REVIEW. PART 1) Balevski” - Bulgarian Academy of Science, Sofia IMPACT ANALYSIS OF KINETICS AND DYNAMICS Jowita Cioch, Anna Kisiela-Czajka OF SO2 AND NOX ADSORPTION FROM FLUE 46 Wroclaw University of Science and 27 PL GASES ON THE GEOMETRY OF THE COLUMN Technology WITH A FIXED CARBON BED Assist. Prof. eng , PhD Iryna Kazak ONE OF THE METHODS FOR IMPROVING THE Faculty of Chemical Engineering – ELECTRODES CLEANING SYSTEM OF THE National Technical University of 47 30 UA ELECTROFILTER WITH THE PURPOSE OF Ukraine INCREASING THE INTENSITY OF CHECKING DUST “Igor Sikorsky Kyiv Polytechnic Institute”, Kiev Desislava Krasteva, Yasen Hadjitodorov, Radoslav Merdjanov VERTICAL FRICTION EXTRUSION INSTALLATION Institute of Metal Science Equipment 48 OF ALUMINUM ALLOY WELDING WIRE - and Technologies with 42 BG PROCESS PARAMETERS Hydroaerodynamics Centre ”Acad. A. Balevski” - Bulgarian Academy of Science, Sofia Prof., Cor. Member of NAS of Belarus Aliaksandr Ilyushchanka1, 2, Head of the Lab. Iryna Charniak2, Res. Aliaksei Kusin 2, Prof., Dr. Eng. Vecheslav Kaptsevich3, PhD Eng., Doc. Ruslan Kusin3, Nataliai Rutkovskaya3, Dmitry THE APPLICATION OF RAPID PROTOTYPING IN Shamal4, 49 THE STUDING OF SAMPLES OF FILTERING State research and production 56 BY MATERIALS BASED ON WOVEN NETS powder metallurgy association1 – Minsk, State Scientific Institution “O.V. Roman Powder Metallurgy Institute” 2 – Minsk Belarusian state agriculture technical university 3 – Minsk, "3D systems" 4 – Minsk

8 time for presentation 10-12 minutes, questions after each presentation Georgi Dyankov1,, Hristo Kisov1, Evdokia Belina1, Alexander Gisbrecht2,* BIOSENSOR BASED ON DIRECTLY IMMOBILIZED 1 Institute of Optical Materials and 50 60 BG HEMOGLOBIN AND MYOGLOBIN Technology, Bulgarian Academy of Sciences 2 Institute of Electronics, Bulgarian Academy of Sciences TESTING OF TECHNOLOGY FOR JOINING Emil Evin, Ján Viňáš, Dušan Sabadka 51 63 SK MATERIALS IN THE AUTOMOTIVE INDUSTRY Technical University in Košice, RENOVATION OF WORN SURFACES OF Janette Brezinová, Dušan Sabadka, 52 Ján Viňáš 64 SK EQUIPMENT IN THE METALLURGICAL INDUSTRY Technical University in Košice

THURSDAY (09.09) 10:00 – 19:00 POSTER SESSION CONFERENCE HALL 1 SIMPOSIUM “MANAGEMENT” FRIDAY (10.09) 09:00 – 13:00 ORGANIZATIONAL DETERMINANTS OF Anna Horzela 53 CREATING AND DEVELOPING ENERGY CLUSTERS Silesian University of Technology 03 PL IN POLAND 1 FACTORS AFFECTING THE COST OF ELECTRICITY Dasen Jardas , Andrea Arbula 54 Blecich2, Paolo Blecich1 11 HR FROM GEOTHERMAL POWER PLANTS 1 University of Rijeka MARITIME DISASTERS RELATED TO RISK K.d.p. Eng. Shcherev D.M.1, Assoc. MANAGEMENT IN TRANSPORT OF BULK Prof. Dr. Shcherev M.G.2 1 55 16 BG CARGOES WHICH ARE PRONE TO "Bulgarian Navy Shipping" 2 LIQUEFACTION "Technical University - Varna APPLICATION OF THE ANALYTICAL HIERARCHY M.Sc. Velinova SK Higher Naval 56 PROCESS IN EVALUATING TRANSPORT AND School "Nikola.Y.Vaptsarov", Varna 46 BG LOGISTICS SYSTEMS Lorenc Malka1 , Ilirian Konomi1, 2 3 AN INTEGRATED APPROACH TOWARD A Pietro Bartocci , Ermonela Rrapaj 1Polytechnic , AL 57 SUSTAINABLE TRANSPORT SECTOR USING 61 2University of Perugia, IT ENERGYPLAN MODEL: CASE OF ALBANIA 3Technical Director of Energi Ze Haim, Tirana PhD student Giorgi Popkhadze1, Hon.D.Sc. Predrag Dašić2,3, Dr.Sc. Prof. Raul Turmanidze1 Georgian Technical University ANALYSIS OF ICT DEVELOPMENT INDEX (IDI) (GTU)1 GE 58 66 FOR MEASURING ICT RESOURCES IN GEORGIA Academy of Professional Studies RS Šumadija – Department in Trstenik,– Serbia2 SaTCIP Publisher Ltd., Vrnjačka Banja – Serbia3

NEXT CONGRESS “MACHINES. TECHNOLOGIES. MATERIALS”

WINTER SESSION 09.03 - 12.03.2022, BOROVETZ, HOTEL “ELA”

SUMMER SESSION 07.09 - 10.09.2022, VARNA, HOTEL “AQUA AZUR”

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