Analysis of Water Control in an Underground Mine Under Strong Karst Media Influence (Vazante Mine, Brazil)

This work presents analysis of groundwater flow conditions and groundwater control measures for Vazante underground mine located in the state of Minas Gerais, Brazil. According to field observations, groundwater flow processes in this mine are highly influenced by the presence of karst features located in the near-surface terrain next to Santa Catarina River. The karstic features, such as caves, sinkholes, dolines and conduits, have direct contact with the aquifer and tend to increase water flow into the mine. These effects are more acute in areas under the influence of groundwater-level drawdown by pumping. Numerical analyses of this condition were carried out using the computer program FEFLOW. This program represents karstic features as one-dimensional discrete flow conduits inside a three-dimensional finite element structure representing the geologic medium following a combined discrete-continuum approach for representing the karst system. These features create preferential flow paths between the river and mine; their incorporation into the model is able to more realistically represent the hydrogeological environment of the mine surroundings. In order to mitigate the water-inflow problems, impermeabilization of the river through construction of a reinforced concrete channel was incorporated in the developed hydrogeological model. Different scenarios for channelization lengths for the most critical zones along the river were studied. Obtained results were able to compare effectiveness of different river channelization scenarios. It was also possible to determine whether the use of these impermeabilization measures would be able to reduce, in large part, the elevated costs of pumping inside the mine

CONTROL of MULTIFORM VENTRICULAR-TACHYCARDIA BY PROPRANOLOL in A CHILD WITH NO IDENTIFIABLE CARDIAC DISEASE and SUDDEN-DEATH

HOSP São Paulo,DIV CLIN CARDIAC ELECTROPHYSIOL,São Paulo,BRAZILPRESBYTERIAN MED CTR,PHILADELPHIA HEART INST,PHILADELPHIA,PAHOSP São Paulo,DIV CLIN CARDIAC ELECTROPHYSIOL,São Paulo,BRAZILWeb of Scienc

ANGIOGRAPHIC and ELECTROPHYSIOLOGIC SUBSTRATES of VENTRICULAR-TACHYCARDIA in CHRONIC CHAGASIC MYOCARDITIS

PRESBYTERIAN MED CTR PHILADELPHIA,PHILADELPHIA HEART INST,39TH & MARKET ST,PHILADELPHIA,PA 19104ESCOLA PAULISTA MED SCH,HOSP São Paulo,DIV CLIN CARDIAC ELECTROPHYSIOL,BR-04023 São Paulo,SP,BRAZILESCOLA PAULISTA MED SCH,HOSP São Paulo,DIV CLIN CARDIAC ELECTROPHYSIOL,BR-04023 São Paulo,SP,BRAZILWeb of Scienc

AUTOMATIC IMPLANTABLE DEFIBRILLATOR WITH VVI PACEMAKER in A PATIENT WITH CHRONIC CHAGAS MYOCARDITIS and TOTAL ATRIOVENTRICULAR-BLOCK

PRESBYTERIAN MED CTR PHILADELPHIA,PHILADELPHIA HEART INST,39TH & MARKET ST,PHILADELPHIA,PA 19104ESCOLA PAULISTA MED SCH,HOSP São Paulo,DIV CLIN CARDIAC ELECTROPHYSIOL,BR-04023 São Paulo,SP,BRAZILESCOLA PAULISTA MED SCH,HOSP São Paulo,DIV CLIN CARDIAC ELECTROPHYSIOL,BR-04023 São Paulo,SP,BRAZILESCOLA PAULISTA MED SCH,HOSP São Paulo,DIV CLIN CARDIAC ELECTROPHYSIOL,BR-04023 São Paulo,SP,BRAZILWeb of Scienc

Environmental diagnosis of risk areas related to gas stations

Studies were carried out on the localization and mapping of gas stations in the urban area of São Carlos city, for an environmental diagnosis related to soil, surface water and underground water contamination resulting from likely leaking in fuel underground storage tanks. Considering that a provision of legal restriction makes it possible that most of public areas are not located in gas station areas of potential risk, these information are useful for the development of programs designed to reduce risks to public safety and health and of the soil, surface water and underground water contamination.<br>Foram realizados a localização e o mapeamento dos postos de combustíveis da área urbana do município de São Carlos, SP, para um diagnóstico ambiental relacionado aos riscos de contaminação do solo e das águas superficial e subterrânea em decorrência de prováveis vazamentos dos tanques de armazenamento subterrâneo de combustível. A área urbana da cidade de São Carlos apresenta um total de 64 postos de combustíveis, 58 dos quais com fins exclusivamente comerciais; um volume potencial de combustível armazenado de 4.595.000 l associado a um total de 291 tanques de armazenamento subterrâneo, 40 % dos quais associados a postos que funcionam a mais de 15 anos; localizados em terrenos com características geológicas de risco potencial para a contaminação das águas subterrâneas, e concentradas em áreas urbanas com alta e média densidade populacional. Considerando que um dispostivo de restrição legal possibilita que a maioria das áreas de uso público (escolas, creches, postos de saúde e hospitais) esteja localizada externa as áreas críticas de riscos potenciais aos usuários das mesmas, estas informações são extremamente úteis para o desenvolvimento de programas voltados à redução dos riscos à segurança e a saúde pública e à contaminação do solo e da água subterrânea