RESEARCH OF POWER IMPULSES TRANSFER THROUGH THREADED CONNECTIONS OF THE DRILL-STRING DURING ROTARY-PERCUSSION DRILLING OF PILOT HOLES FOR TRENCHLESS PIPELINE LAYING

The relevance of the research.Pilot wells for horizontal directional drilling can be attributed to slim holes that are widely used in mining, in particular, for detailed exploration and underground development of non-ferrous metal ores, for degassing mine workings of coal mines, as well as in a lot of other industries to limit the diameter of a hol

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Application of provincial data in mathematical modelling to inform sub-national tuberculosis program decision-making in South Africa.

South Africa has the highest tuberculosis (TB) disease incidence rate in the world, and TB is the leading infectious cause of death.Decisions on, and funding for, TB prevention and care policies are decentralised to the provincial governments and therefore, tools to inform policy need to operate at this level.We describe the use of a mathematical m

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Baltic Sea shipwrecks as a source of hazardous pollution

Background Shipwrecks on the Baltic Sea seabed pose a serious threat to the marine environment.Fuel, ammunition and chemicals in their holds can enter the ecosystem at any time, causing an ecological disaster.It is known that oil spills from ship accidents can affect life and health of different species of animals, both immediately after catastroph

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