نتایج جستجو برای: virtual water

تعداد نتایج: 694375  

2017
Subhalaxmi Mishra T. Palani Selvam

PURPOSE To investigate beam quality correction, KQQ0 (r) and phantom scatter correction, Kphan (r) for lithium formate dosimeter as a function of distance r along the transverse axis of the high-energy brachytherapy sources 60Co, 137Cs, 192Ir and 169Yb using the Monte Carlo-based EGSnrc code system. MATERIALS AND METHODS The brachytherapy sources investigated in this study are BEBIG High Dose...

Journal: :Ambio 2007
James N Galloway Marshall Burke G Eric Bradford Rosamond Naylor Walter Falcon Ashok K Chapagain Joanne C Gaskell Ellen McCullough Harold A Mooney Kirsten L L Oleson Henning Steinfeld Tom Wassenaar Vaclav Smil

This paper provides an original account of global land, water, and nitrogen use in support of industrialized livestock production and trade, with emphasis on two of the fastest-growing sectors, pork and poultry. Our analysis focuses on trade in feed and animal products, using a new model that calculates the amount of "virtual" nitrogen, water, and land used in production but not embedded in the...

2003
Jorge Trindade Carlos Fiolhais

In order to understand various aspects of student understanding of atomic orbitals, we have built a 3-D virtual environment – “Virtual Water” – to support the learning of some concepts of Physics and Chemistry at the final high school and first-year university levels. It is centered in the microscopic structure of water and explores, among others, concepts related to atomic and molecular orbita...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2013
Samir Suweis Andrea Rinaldo Amos Maritan Paolo D'Odorico

Population growth is in general constrained by food production, which in turn depends on the access to water resources. At a country level, some populations use more water than they control because of their ability to import food and the virtual water required for its production. Here, we investigate the dependence of demographic growth on available water resources for exporting and importing n...

2016
Sang-Hyun Lee Rabi H. Mohtar Jin-Yong Choi Seung-Hwan Yoo

This study aims to analyze the characteristics of global virtual water trade (GVWT), such as the connectivity of each trader, vulnerable importers, and influential countries, using degree and eigenvector centrality during the period 2006–2010. The degree centrality was used to measure the connectivity, and eigenvector centrality was used to measure the influence on the entire GVWT network. Mexi...

Journal: :JOURNAL OF NATURAL RESOURCES 2019

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