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Dear readers and colleagues.
This issue of our journal of collected scientific papers is peculiar for us as it is an anniversary edition – No. 100. This year our Institute celebrates the 45th birthday. The date is modest though for us it is distinguished as biographies of a great number of our people are closely connected with the date. The IGTM under the NAS of Ukraine is one of the leading mining institutions of the National Academy of Science. Over various stretches of time a lot of well-known specialists worked in our Institute. Today it includes 20 structural divisions (departments and labs) that devote all their efforts and time to overcome different pressing challenges associated with: geotechnical mechanics; pneumatic transport systems; elastomer structures  for mining machinery; rock aerogasdynamics; explosion mechanics in the rocks; rock aerothermodynamics; designing of automated ventilation control system, development of safety system for mines and new practices of mineral opencast mining; rock mechanics; problems of rock failure; physical and mechanical principals of mining and rail transports; processing of mineral inputs; mineral mining at great depth; structural changes in rocks; dynamic rock-pressure control; facilities to prevent gasdynamic processes; creation of power complexes in mines; intensification of heat-mass exchange processes. We encourage ourselves to set very ambitious objectives because we know that we have good resources to put them in to life.

It is not our target to expound our scientific findings in full details in this jubilee edition – this is the prerogative of regular issues of our journal. We only want to tell our  colleagues about the achievements that we have attained in the course of our long history and attract them to cooperate with us in order to work together successfully for the benefit of the international scientific community.
We will be pleased very much if you become interested in the published materials. You are welcome to contact us to get deeper knowledge about our researches.
I wish you every success! We believe that more detailed acquaintance with our Institute could be useful for you.
A.F. Bulat, Director
SEVERAL PAGES ABOUT HISTORY AND CURRENT ACTIVITY OF THE M.S POLYAKOV INSTITUTE OF GEOTECHNICAL MECHANICS INDER THE NATIONAL ACADEMY OF SCIENCE OF UKRAINE
HISTORY OF THE IGTM UNDER THE NAS OF UKRAINE
03. HISTORY OF CREATION AND DEVELOPMENT OF THE DEPARTMENT OF GEODYNAMIC SYSTEMS AND VIBRATION TECHNOLOGIES, IGTM, NASU, AND FIELDS OF SCIENTIFIC RESEARCHES
04. BASIC ACHIEVEMENTS IN THE FIELD OF GEOTECHNOLOGIES, SYSTEMS OF PIPELINE PNEUMATIC TRANSPORTS, THERMAL ENERGY, AND LEAKAGE CONTROL OF THE HOLLOW WARES
05. DEPARTMENT OF ELASTOMERIC COMPONENT MECHANICS IN MINING MACHINES: HISTORY OF CREATION AND DEVELOPMENT
06. HISTORY OF CREATION AND DEVELOPMENT OF MINING AEROGASDYNAMICS DEPARTMENT
07. DEPARTMENT OF ROCK EXPLOSION MECHANICS: HISTORY OF CREATION AND BASIC STAGES OF ACTIVITY
08. BASIC FIELDS OF ACTIVITY OF THE DEPARTMENT OF ROCK THERMOAERODYNAMICS AND AUTOMATED SYSTEMS
09. CONTRIBUTION OF SCIENTISTS FROM DEPARTMENT OF GEOMECHANICS OF MINERAL OPENCAST MINING TECHNOLOGY OF THE M.S.POLYAKOV INSTITUTE OF GEOTECHNICAL MECHANICS, NAS OF UKRAINE, INTO IMPROVEMENT OF OPENCAST PRACTICE FOR MINING DEPOSITS IN UKRAINE
10. HISTORY AND DEVELOPMENT OF THE ROCK MECHANICS DEPARTMENT
11. HISTORY OF CREATION AND DEVELOPMENT OF THE DEPARTMENT OF ROCK BREAKING PROBLEMS
12. HISTORY OF CREATION AND DEVELOPMENT OF THE DEPARTMENT OF MINING TRANSPORT PHYSICS AND MECHANICS
13. HISTORY OF CREATION AND DEVELOPMENT OF THE MINE RAILWAY TRANSPORT DEPARTMENT AND LABORATORY
14. ON THE ISSUES OF SYNTHESIS OF VIBRATION MACHINE PARAMETERS IN THE MINERAL PROCESSING
15. DEPARTMENT OF GEOLOGY OF COAL BEDS AT GREAT DEPTHS: HISTORY OF CREATION AND DEVELOPMENT
16. LABORATORY ON RESEARCHING ROCK STRUCTURAL CHANGES – 7-YEAR HISTORY
17. BASIC SCEINTIFIC ORIENTATIONS OF THE DEPARTMENT OF PRESSURE DYNAMICS CONTROL IN ROCKS
18. DEPARTMENT OF MINERAL MINING AT GREAT DEPTHS: HISTORY OF CREATION AND FIELDS OF ACTIVITY
19. METHODS TO DEGAS ROCK-AND-COAL MASSIF AND PREVENT GASDYNAMIC PHENOMENA WITH THE HELP OF HYDRODYNAMIC, PNEUMOHYDRODINAMIC, PNEUMODYNAMIC VIBRATION AND MICROBIOLOGICAL IMPACTS
20. DEPARTMENT OF MINE ENERGY COMPLEXES. BASIC ACHIEVEMENTS
21. DEVELOPMENT OF SCIENTIFIC BASIC PRINCIPALS FOR NEW METHODS OF INTENSIFICATION OF HEAT-AND-MASS TRANSFER PROCESSES IN WORKING MEDIA UNDER THE INFLUENCE OF PERIODIC FORCE FIELDS
22. FRAGMENTS FROM HISTORY OF CREATION AND FIELDS OF ACTIVITY OF THE DEPARTMENT OF ROCK EXTRACTION AND LOADING PROCESSES (1961-1987)