Problém náhleho výbuchu plynu v horniane v Čechách a v cudzine Sudden outbursts of rock and gas present some of the most complicated problems in the deep underground mining. This paper deals with a solution of these problems in different countries around the world. It is searching for methods of prediction and prognosis that can be most useful for the control of these phenomena. The records of ...

An increased mortality from lung and stomach cancer was found in previous studies on Lorraine iron miners. A detailed analysis, however, was not possible due to the lack of data for survivors. In this study the cohort included 1178 workers selected at random from all the 5300 working miners aged between 35 and 55 at the start of the follow up period, which ranged from 1975 to 1985. Occupational...

We present a review of atmospheric and underground muon flux measurements. The relevance of these data for the atmospheric neutrino flux computation is emphasized. Possible sources of systematic errors in the measurements are discussed, focusing on the sea level muon data. Underground muon data are also reported.

Given a vast empirical evidence that cash is widely used in the underground economy, inter-governmental bodies like FATF recommend policy measures aimed at limitation of cash and at combat of money laundering. We show that there is no simple monotone relationship between policy and the size of underground economy, so that the policy has at best a limited scope.

To control the overbreaking of an underground mining development gallery, controlled blasting technique was proposed and as a result it possible to reduce costs improve physical stability periphery opening, achieving greater safety for personnel equipment. With support geomechanical studies, rock quality advancing front determined, serving design drilling mesh choice distribution explosives in ...

an efficient and simple method for the preparation of si-imidazole-hso4 functionalized magnetic fe3o4 nanoparticles (si-im-hso4 mnps) and used as an efficient and reusable magnetic catalysts for the regioselective ring opening of epoxides under green conditions in water. this catalyst was used for the ring opening of epoxide corresponding to the thiocyanohydrins and azidohydrines. compared to t...

Belowground competition occurs when plants decrease the growth, survival, or fecundity of neighbors by reducing available soil resources. Competition belowground can be stronger and involve many more neighbors than aboveground competition. Physiological ecologists and population or community ecologists have traditionally studied belowground competition from different perspectives. Physiological...