INVESTIGATION OF THE CIRCADIAN EFFICIENCY OF LIGHTING IN AN EDUCATIONAL LABORATORY

Iva Petrinska, Dilyan Ivanov
Technical University of Sofia, Sofia, Bulgaria

SOME NEW ASPECTS IN THE LIGHTNING PROTECTION OF PHOTOVOLTAIC ELECTRICAL POWER PLANTS
Georgi Velev, Krasimir Ivanov, Petar Petrov
Technical University of Gabrovo, Gabrovo, Bulgaria

PHOTOBIOLOGICAL IMPACT OF LED LIGHTING ON HUMANS
Veselina Stefanova
Technical University of Gabrovo, Gabrovo, Bulgaria

ANALYSIS OF ELECTRICAL QUANTITIES DURING OPERATION OF INDUCTION MOTORS WITH FREQUENCY CONTROL
Lyubomir Dimitrov
Technical University of Gabrovo, Gabrovo, Bulgaria

STUDY OF THE PHOTOMETRIC AND COLORIMETRIC CHARACTERISTICS OF LED FLOODLIGHTS DURING THE WARM-UP PROCESS
Plamen Tsankov, Milko Yovchev, Hristo Ibrishimov, Ivaylo Stoyanov
Technical University of Gabrovo, Gabrovo, Bulgaria

STUDYING THE INFLUENCE OF CLIMATIC FACTORS ON THE CAPACITY UTILIZATION FACTOR OF A PHOTOVOLTAIC SYSTEM WITH CIGS MODULES
Ivaylo Lazarov
Technical University of Gabrovo, Gabrovo, Bulgaria

ENERGY EFFICIENCY OF MINING PUMP UNITS
Dimitrina Koeva, Valentin Georgiev
Technical University of Gabrovo, Gabrovo, Bulgaria

ELECTRICITY EFFICIENCY OF FLOTATION FACILITIES
Nikolay Lakov
University of Mining and Geology “St. Ivan Rilski”, Sofia, Bulgaria

PERSPECTIVES FOR INCREASING PHOTOVOLTAIC ELECTRICITY GENERATION IN PIROT, SERBIA
Ivana Radonjić¹, Milutin Petronijević², Leonid Stoimenov², Aleksandar Stanimirović², Aleksandar Milosavljević², Boban Veselić^2
1University of Niš, Faculty of Sciences and Mathematics, Department of Physics, Niš, Serbia
²University of Niš, Faculty of Electronic Engineering, Niš, Serbia

PHOTOVOLTAICS ROLE IN BUILDING GREENER SOCIETY IN SOUTHEASTERN PART OF EUROPE
Ivana Radonjić¹, Dragoljub Mirjanić², Tomislav Pavlović¹, Plamen Tsankov³, Darko Divnić², Lana Pantić^1
1University of Niš, Faculty of Sciences and Mathematics, Department of Physics, Niš, Serbia
²Academy of Sciences and Arts of the Republic of Srpska, Banja Luka, Republic of Srpska, Bosnia and Herzegovina
³Technical University of Gabrovo, Gabrovo, Bulgaria

TOLERANCE ANALYSIS OF BOOST DC-DC CONVERTER
Gergana Vacheva¹, Plamen Stanchev², Nikolay Hinov^1
1Technical University of Sofia, Department of Power electronics, Sofia, Bulgaria
²Technical University of Sofia, Department of Information technology in industry, Sofia, Bulgaria

MACHINE-GENERATED NEURAL NETWORKS FOR SHORT-TERM LOAD FORECASTING
Gergana Vacheva¹, Plamen Stanchev², Nikolay Hinov^1
1Technical University of Sofia, Department of Power electronics, Sofia, Bulgaria
²Technical University of Sofia, Department of Information technology in industry, Sofia, Bulgaria

INCREASING THE EFFICIENCY OF ULTRAVIOLET RADIATION SYSTEMS
Pylyp Hovorov, Anastasiia Kindinova, Danylo Zozylya, Oksana Raptanova
O.M. Beketov National University of Urban Economy in Kharkiv, Kharkiv, Ukraine

TRENDS AND FORECASTS FOR BULGARIA'S ENERGY TRANSITION BALANCING MARKET
Dimitrina Koeva¹, Ralena Kutkarska^2
1Technical University of Gabrovo, Gabrovo, Bulgaria
²Municipality of Sliven, Sliven, Bulgaria