نتایج جستجو برای: usually without secure underground and surface water supply
تعداد نتایج: 17100190 فیلتر نتایج به سال:
At present, the cooling of all the hot underground operations at Impala is achieved by providing refrigerated air from surface. However, the depth of a number of planned projects will approach 2 000 m below surface and other future proposed operations will extend to even deeper levels. Obviously these depths will approach the horizon where acceptable underground conditions can no longer be achi...
The water supply is the crucial problem of human beings in the world. Earth dams are usually the most important structures to store and manage the main sources: surface waters. The safety of earth dams in different conditions especially under earthquake loadings plays a vital role in sustainable developments. Recently, mixed-clay soil is widely used as water- seal material in the core of earth ...
[1] Using an estimated bicarbonate concentration ([HCO3 ]) in water and discharge rates of surface water and underground water from the Houzhai Basin, southwest China, from 1986 to 2007, we estimate that the mean carbon uptake rate was 20.7 g C m yr. The surface water and underground water contribute about equally to the total carbon uptake from 1986 to 2007. About 97% of the interannual variat...
Abstract Water availability significantly affects development of agriculture, industry and urban services. Thus, the water industry is among the fundamental industries. Yet, most countries, especially developing countries, are suffering from water deficit, water pollution and flood hazards. These problems are more severe in Iran due to improper management of water resources. Integrated water ...
to evaluate the hydrogeochemical characteristics of karst water resources of oshtorankooh, chemistry details of springs has been considered as the most important evacuator of karst resources. this research has been performed to study hydrogeochemical nature of karst springs and their origin with an emphasis on the type of formation. accordingly, five samples of the water of permanent springs o...
Introduction: By knowing the water consumption rate in different sectors can be done essential planning the water supply. In this study was investigated the rate of per capita domestic water consumption in ardakan urban area and its relationship with water consumption variables. Methods: this descriptive - cross sectional study and was conducted to cluster sampling method over 300 families in ...
Introduction & Objective: Rivers are one of the main water supply resources for various uses such as agricultural, industrial and drinking purposes. As population and consumption increase, monitoring of rivers water quality becomes an important function of environmental management field. Because Darreh-Morad Beyg river of Hamadan is a water supply for different purposes and many pollutants ar...
Background and Objectives: With increasing population, the process of contamination of water resources has intensified and humans need new and inexpensive ways to refine and improve water quality. Heavy metals are the environmental pollutants that originate mainly from industrial and agricultural activities and are found in all parts of the industrial communities. This research was conducted to...
بررسی تطبیقی بازده حاصل از کاربرد تحلیل های تکنیکال و روش خرید و نگهداری در بورس اوراق بهادار تهران چکیده در این پژوهش بازدهی حاصل از روش های تجزیه و تحلیل تکنیکی و روش خرید و نگهداری در فرض قابل پیش بینی بودن قیمت ها و عدم وجود شکل ضعیف فرضیه بازار کارا که توسط فاما در سال 791 مطرح گردیده است ، فعالیت میکند . در این مطالعه چهار روش از پر کاربردترین و معتبر ترین روش های تحلیل تکنیکی مورد بر...
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