Volume 24 / C o n t e n t s
1. Dimitar Dimitrov
THIN VISCOUS ELLIPTICAL ACCRETION DISCS WITH ORBITS SHARING A COMMON LONGITUDE
OF PERIASTRON. V. LINEAR RELATIONS BETWEEN AZIMUTHAL-ANGLE AVERAGED FACTORS
IN THE DYNAMICAL EQUATION		 5
2. Dimitar Dimitrov
THIN VISCOUS ELLIPTICAL ACCRETION DISCS WITH ORBITS SHARING
A COMMON LONGITUDE OF PERIASTRON. VI. SIMPLIFICATION OF THE DYNAMICAL EQUATION		 33
3. Dimitar Valev
CONSEQUENCES FROM CONSERVATION OF THE TOTAL DENSITY
OF THE UNIVERSE DURING THE EXPANSION		 60
4. Dimitar Valev
ESTIMATIONS OF TOTAL MASS AND DENSITY OF THE OBSERVABLE UNIVERSE
BY DIMENSIONAL ANALYSIS		 67
5. Atanas Atanassov
 MESOPAUSE TEMPERATURE RETRIEVAL FROM SATI MEASURED SPECTRA WITHA BACKGROUND WITH LINER INTENSITY COMPONENT. RESULTS FROM THE NUMERICAL SIMULATION		 77
6. Tsvetan Dachev, Borislav Tomov, Yury Matviichuk, Plamen Dimitrov, Frantisek Spurny, Ondrej Ploc, Yukio Uchihori, Erwin Flueckiger, Karel Kudela, Eric Benton
 OVERVIEW OF THE ATMOSPHERIC IONIZING RADIATION ENVIRONMENT MONITORING
BY BULGARIAN BUILD INSTRUMENTS		 87
7. Stiliyan Stoyanov, Garo Mardirossian
RESEARCH OF THE RELATIONSHIPS BETWEEN LIGHT DISPERSION AND CONTRAST
OF THE REGISTERED IMAGE AT DIFFERENT BACKGROUND BRIGHTNESS		 109
8. Petar Dimitrov, Eugenia Roumenina
STUDYING THE RELATIONSHIP BETWEEN SOME ATTRIBUTES OF CONIFEROUS FORESTS
AND SPECTRAL DATA FROM THE ASTER SATELLITE SENSOR		 116
9. Ramzi Ahmed
DOMESTIC PARKING ESTIMATION USING REMOTLY SENSED DATA		 129
10. Bozhidar Srebrov, Iliya Cholakov
GEOMAGNETIC SURVEYS ON THE TERRITOTY OF SOFIA AIRPORT		 139
11. Roumen Nedkov
ASSESSMENT OF INFORMATION EFFICIENCY AND DATA QUALITY FROM MICROSATELLITE
FOR THE NEED OF ECOLOGICAL MONITORING		 146
12. Valentina Tsekova
SYNTHESIS OF OPTIMAL FILTER OF AUTOMATED CONTROL SYSTEM
OF SELF-AIMING UNMANNED AIR VEHICLE WITH FIXED COORDINATOR		 151
13. Rayna Dimitrova, Bojana Tabakova
PULSE–ARC PLASMA WELDING AND SURFACING PROCESSES		 162
  News  
  Eugenia Roumenina, Gheorghe Stancalie, Valentin Kazandjiev
INFORMATION ABOUT THE START OF PROJECT TESTING PROBA-V AND VEGETATION DATA
FOR AGRICULTURAL APPLICATIONS IN BULGARIA AND ROMANIA–PROAGROBURO		 174
  New books  
  Garo Mardirossian
A NEW BOOK IN THE FIELD OF AEROSPACE RESEARCH AND TECHNOLOGIES

177
  Radi Radichev
A NEW BOOK ON NATURAL HAZARDS AND PROTECTION AGAINST THEM		 178
  Zdenka Schenkova
NATURAL HAZARDS – NONLINEARITIES AND ASSESSMENT.
NATURAL HAZARDS COMPLEXITIES, MULTIDISASTERS, METHODOLOGIES,
RISK MAPPING, RISK MANAGEMENT, PREVENTION AND PROTECTION		 179