Vol. 4 (2025): Environment. Technology. Resources. Proceedings of the 16th International Scientific and Practical Conference. Volume 4

View Vol. 4 (2025): Environment. Technology. Resources. Proceedings of the 16th International Scientific and Practical Conference. Volume 4

Published: 08.06.2025

INVESTIGATION OF THE MICROSTRUCTURE AND MICROHARDNESS AFTER ELECTRON BEAM WELDING OF AISI 316L STAINLESS STEEL AND LASERFORM MARAGING STEEL

Milka Atanasova

17-21
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WELDABILITY OF AISI 316L STAINLESS STEEL AND CARBIDIC AUSTEMPERED DUCTILE IRON USING ELECTRON BEAM WELDING TECHNOLOGY

Milka Atanasova

23-27
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INDUSTRY 4.0: IMPLEMENTATION OF DIGITAL TECHNOLOGIES TO IMPROVE PRODUCTION AND ECONOMIC EFFICIENCY

Iryna Bohashko, Oleksandr Bohashko, Inna Kosmidailo

45-51
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ELECTRO-HYDRAULIC SYSTEM OPTIMIZATION THROUGH AN ADVANCED KALMAN FILTER

Dimitar Dichev, Borislav Georgiev, Iliya Zhelezharov

65-71
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PARAMETER EVALUATION AND CONTROL IN AN ELECTRO-HYDRAULIC SYSTEM USING AN ADVANCED LEAST SQUARES METHOD

Dimitar Dichev, Borislav Georgiev, Iliya Zhelezharov

73-79
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DEVELOPMENT OF COMPOSITES BASED ON THERMOSETTING POLYMERS (EPOXY, POLYESTER AND VINYLESTER RESINS) WITH CENOSPHERE FILLERS IN DIFFERENT CONCENTRATIONS – 5 WT.%, 10 WT.% AND 15 WT.%

Boyan Dochev, Filip Ublekov, Desislava Dimova, Mihail Zagorski, Nikola Tomanov

81-84
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THE ROLE OF THE LEADER IN THE PROCESS OF OVERCOMING COMMUNICATION BARRIERS IN THE NEW ERA OF INDUSTRY 4.0

Svetlana Dimitrakieva, Marina Marinova-Stoyanova, Zhulieta Mihaylova

85-90
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INTEGRATING ARTIFICIAL INTELLIGENCE INTO THE MANAGEMENT DECISION-MAKING PROCESS IN THE NEW ERA OF INDUSTRY 4.0

Svetlana Dimitrakieva, Marina Marinova-Stoyanova, Boris Gramchev

91-98
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NUTRITIONAL STRATEGIES AND INNOVATIVE TECHNOLOGIES FOR MAINTAINING THE OPERATIONAL READINESS OF MILITARY PERSONNEL IN EXTREME CONDITIONS

Petia Gencheva, Iliyan Hutov, Borislav Genov

99-104
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SIMULATION ANALYSIS OF WIENER AND LOW-PASS FILTRATION IN EHS

Borislav Georgiev

105-110
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EXPERIMENTAL STUDY OF THE FREQUENCY CHARACTERISTICS OF AN ELECTROPNEUMATIC TRACKING SYSTEM WITH HIGH SPEED PNEUMATIC VALVES AND PWM CONTROL

Georgi Iliev, Hristo Nedev Hristov, Docho Svetlozarov Dimitrov

111-115
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EXPERIMENTAL INVESTIGATION OF DYNAMIC PROCESSES IN AN ELECTROPNEUMATIC POSITIONING SYSTEM WITH HIGH SPEED VALVES AND PWM

Georgi Iliev, Hristo Hristov

117-122
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A STUDY OF THE BOILOVER PHENOMENON. EXPERIMENTAL DETERMINATION OF MASS BURNING RATE AND BOILOVER TIME

Evgeniy Ivanov, Stefan Parvanov

123-126
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DETERMINING THE RELATIONSHIP BETWEEN THE PARAMETERS TIME TO BOILOVER AND MASS BURNING RATE WITH THE PREVENTION AND RESPONSE STRATEGIES IN PETROLEUM PRODUCT STORAGE TANK FIRES

Evgeniy Ivanov, Stefan Parvanov

127-132
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APPROACHES TOWARDS IMPROVING THE SAFETY OF DINITRAMIDES AS ENERGETIC MATERIALS

Nadejda Jeleva, Petya Gencheva

133-137
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SYSTEM FOR TESTING AND DETERMINING THE ACCURACY OF A MECHANICAL WATCH

Tsanko Karadzhov, Borislav Georgiev

139-144
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RESEARCH AND MODELING OF THE FINISHING METHOD OF CYLINDRICAL GEAR TEETH THROUGH COLD PLASTIC CALIBRATION

Kalin Krumov, Hristo Metev

145-149
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RESEARCH OF THE SURFACE ROUGHNESS DURING HARD TURNING OF 42CRMOS4 STEEL WITH A QUICK-CHANGE TOOL HOLDER

Georgi Karlovski, Petko Naydenov

151-155
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STRUCTURES FOR WOVEN-LIKE KNITTING FABRICS MADE ON CIRCULAR KNITTING MACHINES

Desislava Kovacheva, Borislav Stoyanov, Krasimir Drumev, Ivelin Banev, Petar Nikolov

157-160
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ANALYTICAL DETERMINATION OF ERROR FROM STATIC ADJUSTMENT OF BORING HEADS CUTTING PART DURING COMBINED MACHINING OF HOLES

Angel Lengerov, Nadya Arabadzhieva, Konstantin Chukalov

161-164
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IMPROVEMENT OF DIMENSIONAL ACCURACY ANALYSIS FOR ASSEMBLY OF ENGINEERING PARTS

Angel Lengerov, Silvia Salapateva, Konstantin Chukalov

165-168
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MECHANICAL AND MORPHOLOGICAL PROPERTIES OF PP/PE COMPOSITE FISHING NET ROPES

Inga Lasenko, Andris Martinovs, Artūrs Mačanovskis, Arta Viluma-Gudmona, Sanjay Rajni Vejanand, Sandra Vasilevska, Sai Pavan Kanukuntla

169-180
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DETERMINATION OF AXIAL FORCES OF TOOL ELEMENTS FOR PLASTICALLY STRENGTHENING HOLE MACHINING

Angel Lengerov, Nadya Arabadzieva, Silvia Salapateva

181-184
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INVESTIGATION OF THE TREND BETWEEN THE RESULTS OF THE BARKHAUSEN MAGNETIC NOISE (MBN) METHOD WITH CLASSICAL METHODS FOR ION NITRIDED TESTING OF STEEL, BH11

Velichko Machev, Vladimir Kamenov, Stefan Stanev, Nikolay Tontchev

185-188
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COMPUTER GRAFOANALITIC KINEMATICAL ANALYSIS FOR FOUR-BAR LINKAGE MECHANISM

Marin Marinov

189-193
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RESEARCH OF ELECTRICITY LOSSES IN ELECTRIC NETWORKS

Misho Matsankov

195-199
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RESEARCH OF ELECTRICAL GENERATOR MODEL (STAGE: PHASE DIFFERENCES IMPACT ON GENERATION PROCESSES)

Vaidotas Matutis, Loreta Savulioniene, Mantas Vanagas, Karolis Bojakovas, Tomas Kasperavicius

201-207
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AUTOMATED GROUNDWATER MONITORING SYSTEM WITH REAL-TIME DATA COLLECTION AND ANALYSIS USING LORA AND GSM TECHNOLOGIES

Gulrukh Memonova, Peter Schmidt, Javlon Tursunov, Guljakhon Gofurova

209-215
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MULTI-OBJECTIVE OPTIMIZATION OF CUTTING PARAMETERS FOR CNC TURNING 42CRMO4 HARDENED STEEL USING UTILITY FUNCTION

Hristo Metev, Irina Aleksandrova, Nikolay Kolev

217-223
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INVESTIGATION OF THE MACHINABILITY OF 42CRMO4+QT STEEL IN TOOL TURNING WITH CARBIDE INSERTS ON CNC MACHINES WITH ROBOTIC POWER SUPPLY

Hristo Metev, Irina Aleksandrova, Nikolay Kolev

225-233
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INFLUENCE OF THE GEOMETRIC ECCENTRICITY OF A GEAR ON THE VIBRATIONS OF A BEVEL GEAR

Yuliyan Minchev, Ivaylo Minchev

235-238
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ON THE INFLUENCE OF THE ELASTIC ANISOTROPY OF THE PROPELLER ON THE VIBRATIONS OF AZIMUTH THRUSTERS

Yuliyan Minchev, Ivaylo Minchev

239-243
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DETERMING THE COMPENSATING ACTION OF COPPER AFTER SINTERING OF POWDER METALLURGICAL STRUCTURAL STEELS

Petko Naydenov

245-250
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INVESTMENT ACTIVITY OF SMES IN THE FURNITURE INDUSTRY IN THE REPUBLIC OF BULGARIA

Neli Nikolova, Desislava Petrova

251-256
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SELECTION OF MATERIALS USING MULTICRITERIA DECISION MAKING. A CASE STUDY ON CELLULAR MATERIALS

Jekaterina Niktina, Viktors Mironovs, Irina Voronova, Vladimirs Šatrevičs

257-263
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PROPERTIES ASSESSMENT OF PERFORATED METAL PLATES FOR MEDICAL USE

Marija Osipova, Viktors Mironovs, Antons Pacejs, Aleksejs Tatarinovs, Jānis Lungevics, Vjaceslavs Zemcenkovs

265-269
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MATHEMATICAL MODEL FOR CALCULATING THE DISPERSION FLOW RATE OF DECONTAMINATION SOLUTIONS FOR CHEMICAL AND RADIOLOGICAL AGENTS WHEN SPRAYED FROM NOZZLES

Nikolay Padarev

271-276
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A PILOT STUDY OF ATTITUDES TOWARD INTERNET USE AND WEB ACTIVITY AMONG 16- TO 18-YEAR-OLD STUDENTS EDUCATED IN AN ARTS SCHOOL

Vanya Dineva , Julia Doncheva, Valentina Voinohovska

277-281
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CLASSIFICATION OF MICROMECHANICAL ELEMENTS AND FABRICATION OF BEAM-TYPE MICROMECHANICAL ELEMENTS

Desislava Petrova

289-296
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INNOVATIVE DEVELOPMENT AND COMPETITIVENESS OF THE INDUSTRIAL SECTOR INBULGARIA

Desislava Petrova, Neli Nikolova

297-304
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MODERN RISK ANALYSIS IN THE PLANNING AND IMPLEMENTATION OF MODERNIZATION PROJECTS IN RAILWAY INFRASTRUCTURE

Irena Petrova

305-308
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ALGORITHM AND FLOWCHART FOR GEOMETRIC MODELING OF MICROCOMPONENTS BASED ON THE CAD SYSTEM "MICROSYS 25"

Desislava Petrova, Tsanka Zlateva-Petkova, Angel Lengerov

309-314
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METHODOLOGY FOR VARIANT AND GENERATIVE DESIGN OF MICROCOMPONENTS BASED ON THE CAD SYSTEM "MICROSYS 25"

Desislava Petrova, Tsanka Zlateva-Petkova, Angel Lengerov

315-321
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APPLICATION OF ALTERNATIVE APPROACHES FOR INNOVATIVE TECHNOLOGY OBSOLESCENCE IN BULGARIAN ENGINEERING COMPANIES

Desislava Petrova

323-327
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PASSIVE ATHERMALIZATION OF LENSES FOR LWIR SPECTRAL RANGE

Dimcho Pulov, Petar Tsvyatkov

329-335
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PROPER ORTHOGONAL DECOMPOSITION TECHNIQUE FOR DIMENSIONAL REDUCTION FOR NUMERICAL SNAPSHOT MATRIX

Rajeev Ralla, Karunamoorthy Rengasamy Kannathasan, Ilgar Jafarli

337-343
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TRENDS IN THE DEVELOPMENT OF THE TRACTOR AND COMBINE FLEET IN LATVIA

Adolfs Rucins, Dainis Viesturs

345-350
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DESIGN AND MANUFACTORING OF A LABORATORY STAND FOR TESTING ACCELERATED TENSILE CREEP OF PLASTICS ACCORDING TO ASTM D6992

Sabi Sabev, Konstantin Chukalov

357-361
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DYNAMIC ALGORITHM FOR DIMENSIONAL SUB-TUNING IN TURNING

Silviya Salapateva, Radostina Mihova

363-367
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CUTTING MODES IN MULTI-PASS TURNING ON CNC LATHES

Silviya Salapateva, Angel Lengerov

369-373
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EFFECT OF INFILL PATTERN DESIGN ON TENSILE STRENGTH OF FUSED DEPOSITION MODELLED SPECIMENS

Jaymin Vrajlal Sanchaniya, Karunamoorthy Rengasamy Kannathasan, Sanjay Rajni Vejanand, Jay Joshi, Inga Lasenko

375-382
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STRENGTHENING INTERFACIAL BONDING IN NANOFIBRE LAMINATED TEXTILE COMPOSITES

Jaymin Vrajlal Sanchaniya, Ilze Liepiņlauska, Andris Skromulis, Inga Lasenko, Karunamoorthy Rengasamy Kannathasan, Sanjay Rajni Vejanand, Liena Poiša

383-387
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STUDY OF THE PREVALENCE OF BURNOUT SYNDROME AMONG MUSIC TEACHERS

Vanya Dineva, Julia Doncheva, Valentina Voinohovska

389-392
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FLOOD RISK ASSESSMENT AND MANAGEMENT UNDER DIRECTIVE 2007/60/EU: GEODETIC APPROACHES AND DIGITAL TECHNOLOGIES FOR EFFECTIVE PREVENTION

Ani Stefanova

393-397
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AGILE LEADERSHIP UNVEILED: ESSENTIAL TRAITS

Julija Steinhart

399-406
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MODELING THE PENETRATION DEPTH DURING LASER MARKING OF LAYERED REINFORCED COMPOSITES WITH A POLYMER MATRIX

Simeon Tsenkulovski, Petko Naydenov

407-411
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DETERMINING THE RELATIVE IMPORTANCE OF INDICATORS OF SUBURBAN PUBLIC TRANSPORT COMFORT BY THE METHOD OF GEOMETRIC MEAN FUZZY-AHP

Mirena Todorova, Kostadin Trifonov

413-417
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MODELING THE TECHNOLOGY OF THE VARNA FERRY COMPLEX OPERATION USING THE QUEUEING THEORY

Mirena Todorova, Mihail Rangelov

419-423
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RHETORICAL DEVICES IN ADVERTISING SLOGANS: A COMPETITIVENESS VIEWPOINT

Tsvetelina Vladimirova, Hristo Katrandjiev, Noncho Dimitrov

425-430
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IMPACT OF LIGHT INTENSITY AND LUMINAIRE TYPE ON BASIL YIELD: INSIGHTS FROM A HYDROPONIC URBAN AGRICULTURE SYSTEM

Linda Valkovska, Amélie Canon, Anta Sparinska, Olivier dal Zuffo, Ansis Avotins, Martins Marcinkevics

431-437
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RATIONALITY OF USING PNEUMATIC LOOSENERS OF VIBRATION ACTION ON PLOW BODIES

Serhii Yermakov, Taras Hutsol, Oleksandr Hovorov, Pavlo Potapskyi, Serhii Oleksiyko

439-443
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RESEARCH INTO THE POSSIBILITY OF CREATING A WI-FI RADAR FOR DETECTING MOVING FLYING TARGETS IN THE NEARBY AREA OF PROTECTED OBJECTS

Yosif Yosifov

445-449
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POTENTIAL LASER PROCESSING PARAMETERS FOR OBTAINING MILK REPELLING SURFACE ON STAINLESS STEEL (AISI 316L)

Arturs Abolins

453-457
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NUMERICAL EXPERIMENTS FOR THE LASER MARKING BY OXIDATION, MELTING AND EVAPORATION OF AISI 304 STAINLESS STEEL SAMPLES

Nikolay Angelov, Lyubomir Lazov, Erika Teirumnieka, Artis Teilans, Arturs Abolins

459-465
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A NEW APPROACH TO DEVELOPING GAMMA-RAY LASER

Yordan Katsarov

467-474
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OPTIMIZATION OF PARAMETERS FOR WHITE AND DARK LASER MARKING OF COPPER AND BRASS PRODUCTS

Lyubomir Lazov, Risham Ghalot, Nikolay Angelov

475-480
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DETERMINATION OF PRELIMINARY OPERATING POWER DENSITY RANGES FOR SOME LASER TECHNOLOGICAL PROCESSES ON AISI 316 STAINLESS STEEL

Lyubomir Lazov, Nikolay Angelov, Erika Teirumnieka, Artis Teilans, Ritvars Revalds

481-488
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THE IMPACT OF CO2 LASER TREATMENT ON GRAPHENE-MODIFIED KM2-440 BALLISTIC KEVLAR FABRIC AND ITS PROPERTY CHANGES

Jekabs Lapa, Imants Adijāns, Silvija Kukle, Lyubomir Lazov, Ieva Baķe, Uģis Briedis

489-495
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COMPARATIVE ANALYSIS OF THE EFFECTIVENESS OF THE APPLICATION OF UAV AND CONVENTIONAL GROUND EQUIPMENT FOR PLANT PROTECTION MEASURES IN SUNFLOWER CULTIVATION

Pavlina Mihaylova, Yulia Varadinova, Georgi Komitov

497-501
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LASER SURFACE TRANSFORMATION HARDENING WITH HIGH-POWER DIODE LASERS

Normunds Teirumnieks, Lyubomir Lazov, Emil Yankov, Edmunds Teirumnieks, Prodan Prodanov, Artis Teilans

503-510
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