نتایج جستجو برای: water pollution and ecological changes regarding these mentioned problems
تعداد نتایج: 17126011 فیلتر نتایج به سال:
bekenstein and hawking by introducing temperature and every black hole has entropy and using the first law of thermodynamic for black holes showed that this entropy changes with the event horizon surface. bekenstein and hawking entropy equation is valid for the black holes obeying einstein general relativity theory. however, from one side einstein relativity in some cases fails to explain expe...
the present paper deals with criminal issues. for example, legal injunction on the necessity of returning a deposit has a legal nature and legal injunction on the punishment of those who breach the trust has a criminal nature. existing social issues are the basis of classification of some instances into the issue, some of which are based on variation and others on quality. therefore, the motiva...
there are two approaches regarding environmental changes. one of the is ignoring them and continuing present trend in future, and the other is identifying these changes and preparing environmental management program in order to control their negative impacts and plan for the improvement of environmental condition. anzali international wetland is one of the protected wetlands in iran which is in...
Regarding the importance of the watershed plans on one hand and extensive effects of these plans in the rural regions on the other hand, the main purpose of this descriptive-correlative survey was to identify and analyze the effect of watershed plans implement in Deh Jalal village in Zanjan province. The statistical population of this study consisted of all the heads of households of Deh Jalal ...
due to the lack of water quality of resourses in country, exact review of available water resources quality, especially in terms of heavy elements (heavy metals) has a particular importance. due to industrial towns 1 and 2 of yasuj city and also yasuj wastewater treatment, surveying environmental harmful effects of heavy metals on this river is very important. to investigate the changes of heav...
introduction: water shortage is a crucial challenge that threatens future of landscape development in iran. naturally it intensifies by climate change that will be led to water stress of ecosystems. the water stress have confronted universities campus landscape with serious challenges especially those that located in arid and semi-arid areas such as center of iran. malayer university has had se...
The extent to which pollution from tar sands industrial activities in northeastern Alberta, Canada affects ecosystem and human health is a matter of growing concern that is exacerbated by uncertainty. In this paper we determine whether physical and ecological changes that result from tar sands industrial activities are detectable. We analyze a diverse set of environmental data on water and sedi...
asymmetric polyethersulfone (pes) microfiltration flat sheet membranes were composed by the phase inversion method (pim) and were used as supports. composite membranes were fabricated by coating silicone rubber as selective layer. effect of different concentrations of pes and pdms and different solvent such as nmp, dmf and dms effects as pes solvents and support thickness and different coagulat...
reinsurance is widely recognized as an important instrument in the capital management of an insurance company as well as its risk management tool. this thesis is intended to determine premium rates for different types of reinsurance policies. also, given the fact that the reinsurance coverage of every company depends upon its reserves, so different types of reserves and the method of their calc...
Lead and zinc production is one of the main predisposing factors of excessive greenhouse gases emissions, air pollution and water consumption. In this paper, the environmental problems of lead and zinc production in Calcimin plant are expressed and life cycle assessment of this plant is assessed. The data regarding the amount of induced global warming and pollution, acidification, and depletion...
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