نتایج جستجو برای: scarce water resources is a worldwide problem

تعداد نتایج: 14374369  

2018
Kees van Leeuwen Eli de Vries Stef Koop Kees Roest

Water is an abundant resource worldwide, but fresh and clean water is scarce in many areas of the world. Increases in water consumption and climate change will affect global water security even further in the near future. With increasing numbers of people living in metropolitan areas, water, energy, and materials need to be used carefully, reused and renewed. Resource scarcity is the driver beh...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - پژوهشکده ادبیات 1393

1.0 overview it seems that grammar plays a crucial role in the area of second and foreign language learning and widely has been acknowledged in grammar research. in other words, teaching grammar is an issue which has attracted much attention to itself, and a lot of teachers argue about the existence of grammar in language teaching and learning. this issue will remind us a famous sentence f...

Journal: :محیط شناسی 0
تورج نصرآبادی استادیار گروه برنامه ریزی، مدیریت و آموزش محیط زیست، دانشکدۀ محیط زیست دانشگاه تهران الهام عرب کارشناس ارشد برنامه ریزی و مدیریت محیط زیست، دانشکدۀ محیط زیست دانشگاه تهران فرزام پوراصغر سنگاچین دکترای برنامه ریزی و مدیریت محیط زیست، دانشکدۀ محیط زیست دانشگاه تهران

introduction the average annual precipitation in iran is about 250 mm that is not regularly distributed spatially and temporally. more than 70 percent of total precipitation is not accessible due to evapotranspiration. total renewable water resources of the country are estimated to be around 130 billion cubic meters. in spite of limitation in water resources, they are not used properly. agricul...

A. Malviya D. Jaspal I. Tyagi, S. Khamparia, V.K. Gupta,

Water plays a vital and essential role in our ecosystem. This natural resource is becoming scarce, making its availability a major social and economic concern. Use of a large variety of synthetic dyes in textile industries has raised an hazardous environmental alert. About 17 - 20% of freshwater pollution is caused by textile effluents. These effluents are recalcitrant to biodegradation and cau...

Journal: :Environmental science & technology 2014
Kuishuang Feng Klaus Hubacek Stephan Pfister Yang Yu Laixiang Sun

Water footprints and virtual water flows have been promoted as important indicators to characterize human-induced water consumption. However, environmental impacts associated with water consumption are largely neglected in these analyses. Incorporating water scarcity into water consumption allows better understanding of what is causing water scarcity and which regions are suffering from it. In ...

Journal: :Environmental Health Perspectives 2011

Logistics planning in disaster response phase involves dispatching commodities such as medical materials, personnel, food, etc. to affected areas as soon as possible to accelerate the relief operations. Since transportation vehicles in disaster situations can be considered as scarce resources, thus, the efficient usage of them is substantially important. In this study, we provide a dynamic vehi...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید