Mining operations in China are often threatened by frequent water inrushes from confined karst aquifers, We need to evaluate the risk from water-inrush from coal floors in order to have safe production in mines. water inrush risk assessment method based on fuzzy comprehensive evaluation is introduced in this paper. A secondary fuzzy comprehensive evaluation system is constructed to evaluate the...

The longwall mining method is one of the most applied methods in extracting low-inclined to high-inclined coal seams. Selection of the most suitable extraction equipment is very important in the economical, safety, and productivity aspects of mining operations. There are a lot of parameters affecting the selection of an extraction equipment in mechanized longwall mining in steeply inclined coal...

OBJECTIVES Dyspnoea is a common symptom in coal miners with pneumoconiosis. Among others, gas exchange disturbances due to airway obstruction or mismatch between ventilation and perfusion may be underlying mechanisms. The validation of dyspnoea by the degree of airway obstruction is controversial, because the extent of airway obstruction often does not correlate with the clinical grade of breat...

background and aim: salivary gland tumors classification continuously undergoes alternations, especially in the recent years. this study used immunohistochemical markers for distinguishing between polymorphous low-grade adenocarcinoma (plga) and adenocarcinoma carcinoma (adcc) which have several overlapping histological and clinical features. materials & methods: ten adcc and eight plga with fi...

we describe a case of leishmaniasis in a 55-year-old male who presented with weakness, fever and anemia. the patient was born and lived all his life in talaghan, a non-endemic region of kala-azar and there was no history of travel to endemic reigon for leishmania. in primary diagnosis, the patient suspect has been myelofibrosis and then lymphoma and underwent chemotherapy . his general conditio...

the alborz coal basin is located in northern part of iran. the coal deposits of shahrood in eastern alborz, zirab in central alborz and abyek in western alborz were studied as typical coalfields of the basin. shemshak formation which is the main coal-bearing sequence was formed during the triassic-jurassic in the basin. it consists of sandstone, siltstone, shale and claystone, which variedly al...