33 Contents

Volume 33 / C o n t e n t s
1.	*Tsvetan Dachev, Plamen Dimitrov, Borislav Tomov, Yuri Matviichuk Premkumar Saganti, Doug Holland, Kei-Ichi Okuyama, Isai Tapia* DESCRIPTION OF THE "LIULIN TEN-KOH" CHARGED PARTICLES SPECTROMETER FOR THE JAPANESE "TEN-KOH" SATELLITE DOI: https://doi.org/10.3897/arb.v33.e01	5
2.	*Kostadin Sheyretski* INVESTIGATION OF THE MOTION OF A SATELLITE, ACCORDING TO GENERAL THEORY OF RELATIVITY DOI: https://doi.org/10.3897/arb.v33.e02	25
3.	Rolf Werner, Veneta Guineva, Atanas Atanassov, Dimitar Valev, Dimitar Danov, Boyan Petkov, Andrey Kirillov ULTRAVIOLET RADIATION LEVELS OVER BULGARIAN HIGH MOUNTAINS DOI: https://doi.org/10.3897/arb.v33.e03	31
4.	*Petar Dimitrov, Lachezar Filchev, Eugenia Roumenina, Georgi Jelev* CROP TYPE MAPPING IN BULGARIA USING SENTINEL-1/2 DATA DOI: https://doi.org/10.3897/arb.v33.e04	40
5.	*Georgi Jelev, Dilyana Stefanova, Petar Stefanov* LAND COVER AND LAND USE CHANGE IN KARST REGION DEVETASHKO PLATEAU DOI: https://doi.org/10.3897/arb.v33.e05	51
6.	*Maria Dimitrova* SEASONAL CHANGES OF SAHARA DESERT DUST TRANSPORT OVER BALKANS DOI: https://doi.org/10.3897/arb.v33.e06	79
7.	*Mila Atanasova, Hristo Nikolov, Keranka Vassileva* APPLICATION OF GNSS AND SAR DATA IN LANDSLIDE MОNITORING ALONG THE BLACK SEA COAST OF BULGARIA DOI: https://doi.org/10.3897/arb.v33.e07	87
8.	*Zlatomir Dimitrov* INTERFEROMETRIC PROCESSING OF TANDEM-X BISTATIC SAR DATA USING GAMMA – IMPLEMENTATION OUTLINE DOI: https://doi.org/10.3897/arb.v33.e08	101
9.	*Maretta Kazaryan* MATHEMATIC- SYSTEMIC RESEARCHING WITH THE INVOLVEMENT OF FRACTALS WHEN PROCESSING OF SPACE SURVEILLANCE SYSTEMS ON RECOGNITION OF WASTE DISPOSAL OBJECTS DOI: https://doi.org/10.3897/arb.v33.e09	124
10.	*Maretta Kazaryan* ON THE DESIGN OF THE AUTOMATED MONITORING SYSTEM OF WASTE DISPOSAL OBJECTS, INDUSTRIAL INCLUDED, WITH THE APPLICATION OF EARTH DISTANCE SENSING TECHNOLOGIES DOI: https://doi.org/10.3897/arb.v33.e10	140
11.	*Konstantin Metodiev* APPLYING THE CONSTANT STRENGTH DOUBLET METHOD TO RESOLVE A STEADY FLOW AROUND AN AIRFOIL DOI: https://doi.org/10.3897/arb.v33.e11	157
12.	*Mohamed Roudane, Merouane Salhi and Ahmed Boucherit* A NEW DESIGN METHOD FOR HIGH CONDITIONS APPLIED TO MINIMUM LENGTH NOZZLES DOI: https://doi.org/10.3897/arb.v33.e12	167
13.	*Ioana Octavia Bucur, Ion Mălăel, Valeriu Drăgan* AERODYNAMIC PERFORMANCE OF CHEVRON GEOMETRY TRAILING EDGE FOR A TRANSONIC AXIAL COMPRESSOR IMPELLER DOI: https://doi.org/10.3897/arb.v33.e13	184
14.	*Adelina Miteva, Anna Bouzekova-Penkova* SOME AEROSPACE APPLICATIONS OF FUNCTIONALLY GRADED MATERIALS DOI: https://doi.org/10.3897/arb.v33.e14	195
15.	*Angel Tanev* HUMAN RELIABILITY INCREASING APPROACH IN AIRCRAFT MAINTENANCE TECHNICIAN’S TRAINING PROCESS DOI: https://doi.org/10.3897/arb.v33.e15	210
16.	*Zoya Hubenova, Konstantin Metodiev, Svetla Dimitrova, Liubomir Alexiev* USAGE OF EYE TRACKER TECHNOLOGY IN EXAMINING ATTENTION DISTRIBUTION OF OPERATORS OF UNMANNED AERIAL VEHICLES DOI: https://doi.org/10.3897/arb.v33.e16	221
17.	*Nikolay Zagorski* ANALYSIS OF THE MILITARY APPLICATION OF UNMANNED AIRCRAFT AND MAIN DIRECTION FOR THEIR DEVELOPMENT DOI: https://doi.org/10.3897/arb.v33.e17	237
18.	*Lachezar Filchev, Ioannis Manakos, Rainer Reuter, Garo Mardirossian, Tsveta Srebrova, Lubomira Kraleva, Dimitar Dimitrov, Kalliroi Marini, Andreas Rienow* A REVIEW OF EARTH OBSERVATION RESOURCES FOR SECONDARY SCHOOL EDUCATION – PART 2 DOI: https://doi.org/10.3897/arb.v33.e18	251
19.	*Peter Velinov* ADVANCES IN SPACE SCIENCE AND TECHNOLOGY IN CONNECTION WITH 60−TH ANNIVERSARY OF FIRST HUMAN SPACEFLIGHT DOI: https://doi.org/10.3897/arb.v33.e19	260