{"title":"IDENTIFICATION OF THE SOURCES GENERATING IMPACT ON THE WATER QUALITY OF THE EAST JIU BASIN","authors":"A. Simion, M. Lazar","doi":"10.17073/2500-0632-2018-2-34-40","DOIUrl":"https://doi.org/10.17073/2500-0632-2018-2-34-40","url":null,"abstract":"The main economic activity in the Jiu Valley is mining, which provides to the society an important content of mineral raw materials required for the development and progress, representing the main activity in producing the value chain. The majority of the mining activities and other economic activities deployed along the basin of the East Jiu generates both negative environmental impacts (more or less serious) and positive impacts such as those related to employment, staff training, creating infrastructures etc. In the most cases, the negative impacts of the human activities can be much improved up to a point or even eliminated through the remedial measures, particularly through environmental rehabilitation of the affected areas. But if a watercourse is strongly affected by sediments generated by the human activity still on the top side, the pollution will be intensifed much more on the bottom side with signifiant changes on the aquatic ecosystems and with an impossibility of consumption and the use of the water resources by the riparian population. The main objective of this paper consists of the identification and the description of all human activities presented along the East Jiu and the analayses of the negative influence exerted on the river water quality. To compare the water quality of the East Jiu and monitoring its variations in time, it was used the method water quality index (WQI), having the straight purpose of aggregating individual indicators (expressed in physical units) in a unique water quality index.","PeriodicalId":34147,"journal":{"name":"Gornye nauki i tekhnologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42270038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"DETERMINATION OF THE RATIONAL LENGTH OF THE BLOCK ALONG THE STRIKE FOR EXPANSION TO PROVIDE SAFETY AND EFFICIENCY IN THE WORKING OF THE MEDIUM THICK IN-CLINED COAL SEAMS WITH THE ROOM AND PILLAR SYSTEM IN THE QUANG NINH COAL BASIN","authors":"D. Pham, V. G. Vitcalov","doi":"10.17073/2500-0632-2018-2-3-7","DOIUrl":"https://doi.org/10.17073/2500-0632-2018-2-3-7","url":null,"abstract":"An analysis of the constraints that apply the technology and the complexities of the mining and geological conditions of the Quang Ninh coal basin. The possi-bility and expediency of using the foreign experience of working out of the me-dium thick inclined coal seams in the mines of Vietnam. The scheme of prepara-tion and working out of the excavation area is given in view of the technological features in difficult mining and geological conditions, using the room and pillar system and determination of the rational length of the block along the strike.","PeriodicalId":34147,"journal":{"name":"Gornye nauki i tekhnologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46248291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"EFFECT OF CAVITIES SHAPES ON THE ROUGHNESS FRICTION FACTOR IN PERFORATED AND SLOTTED HORIZONTAL WELLS USED TO DEWATER OPENCAST MINES","authors":"Duc Han Tran, C. Drebenstedt","doi":"10.17073/2500-0632-2018-2-9-12","DOIUrl":"https://doi.org/10.17073/2500-0632-2018-2-9-12","url":null,"abstract":"The horizontal wells have been adapted to use for dewatering purpose in the mining industry. Due to unique characteristics, those horizontal filters are rec-ommended to utilize not only the mechanical strength but also the hydraulic per-formance. Pressure drop along the horizontal well is a major factor that affects the performance of a wellbore. The pressure drop incurs due to four separate effects: wall friction, perforation roughness, inflow acceleration and mixing ef-fects. This work presents the effects of the two first factors in perforated or slot-ted pipes, which correspond to the case of no flow through the wall. Numerical analysis was carried out with different types of perforations and slots. The simu-lated model accomplished using ANSYS Fluent 14.5. The results revealed that at high Reynolds number, the roughness friction factors in circular perforated pipes are significantly greater than those in axial slotted pipes and perpendicular slotted pipes.","PeriodicalId":34147,"journal":{"name":"Gornye nauki i tekhnologii","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42601926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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