Volume 30 / C o n t e n t s
1. Mohamed Semeida, Sara Khodairy, Mahmoud El Hadidy, Rabab Abdel Hamed,
Shahinaz Youssef, Penka Stoeva, Alexey Stoev
EXAMINATION OF THE RELATIONSHIP BETWEEN SOLAR ACTIVITY AND EARTH SEISMICITY
DURING THE WEAK SOLAR CYCLE 23
DOI: https://doi.org/10.3897/arb.v30.e01 		5
2. Adlin Dancheva, Simeon Asenovski
STUDY OF WASTE DISPOSAL THERMAL RADIATION USING SATELLITE DATA
AND CONSIDERING SOLAR INFLUENCE
DOI: https://doi.org/10.3897/arb.v30.e02 		16
3. Simeon Asenovski
SOLAR CYCLE BY A LOOK OF HIGH SPEED SOLAR WIND STREAMS VARIATION
DOI: https://doi.org/10.3897/arb.v30.e03 		26
4. Teodora Andreeva – Nesheva, Dimitar Teodossiev, Iliya Iliev
SOME SPECIFICS OF THE DISTRIBUTION OF ELECTROMAGNETIC POLLUTION
ON THE TERRITORY OF SOFIA MUNICIPALITY
DOI: https://doi.org/10.3897/arb.v30.e04 		33
5. Petar Dimitrov, Pontus Olofsson, Georgi Jelev, Ilina Kamenova
MAPPING OF FOREST COVER CHANGE BY POST-CLASSIFICATION COMPARISON
AND MULTITEMPORAL CLASSIFICATION OF SPOT DATA – A BULGARIAN CASE STUDY
DOI: https://doi.org/10.3897/arb.v30.e05 		42
6. Ilina Kamenova, Petar Dimitrov, Rusina Yordanova
EVALUATION OF RAPIDEYE VEGETATION INDICES FOR PREDICTION
OF BIOPHYSICAL/BIOCHEMICAL VARIABLES OF WINTER WHEAT
DOI: https://doi.org/10.3897/arb.v30.e06 		63
7. Dessislava Ganeva, Eugenia Roumenina
REMOTE ESTIMATION OF CROP CANOPY PARAMETERS BY STATISTICAL REGRESSION
ALGORITHMS FOR WINTER RAPESEED USING SENTINEL-2 MULTISPECTRAL IMAGES
DOI: https://doi.org/10.3897/arb.v30.e07 		75
8. Svetoslav Zabunov, Garo Mardirossian
SCALES FOR MEASURING UAV MICRO-MOTOR STATIC THRUST
DOI: https://doi.org/10.3897/arb.v30.e08 		96
9. Maretta Kazaryan, Mikhail Shahramanian, Svetoslav Zabunov
INVESTIGATION OF THE BASIC HAAR WAVELET-TRANSFORMATIONS IN THE PROBLEM
OF DECRYPTION OF SPACE IMAGES ON DETECTION OF WASTE DISPOSAL FIELDS
DOI: https://doi.org/10.3897/arb.v30.e09 		103
10. Petar Getsov, Ruslan Yanev, Wang Bo
 HYBRID PROPULSION OF MULTI-COPTER TYPE UAVS,
FEASIBILITY AND CURRENT STATE OF THE ART
DOI: https://doi.org/10.3897/arb.v30.e10 		123
11. Pavlin Gramatikov, Roumen Nedkov, Doino Petkov
SECONDARY POWER SYSTEMS FOR VIDEOMETRIC COMPLEX "FREGAT"
DOI: https://doi.org/10.3897/arb.v30.e11 		134
12. Аndrii Bychkov, Оlha Nechyporenko
COMPOSITE METAL-CERAMIC AND METAL-POLYMERIC MATERIALS
FOR FRICTION ASSEMBLIES OF NATIONAL CIVIL AIRCRAFTS
DOI: https://doi.org/10.3897/arb.v30.e12 		143
13. Petar Getsov, Dimitar Jordanov, Wang Bo
MODELING OF THE CATASTROFIC VERSION OF A TRANSPORT AIRPLANE
DOI: https://doi.org/10.3897/arb.v30.e13 		155
14. Konstantin Metodiev
DATA LOGGING BY AD7656 ANALOG TO DIGITAL CONVERTER
DOI: https://doi.org/10.3897/arb.v30.e14 		163
15. Nadia Marinova
THE RISK IN AEROSPACE PROJECTS
DOI: https://doi.org/10.3897/arb.v30.e15 		170