منابع مشابه
Mineral resources and geo-engineering
Metals used in everyday life are produced from ores occurring in the Earth’s crust. Geological processes are known to concentrate minerals to form ores of economic value. Mineral processing engineers concentrate these ores by mechanical and physico-chemical methods while the extractive metallurgist extracts the metals by chemical means.
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چکیده ندارد.
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In his excellent book Hippocratic Oaths – Medicine and its Discontents Raymond Tallis fears that ‘medicine may be reaching the end of its course as a profession’. He also fears that ‘the present Government is in the process of removing control of postgraduate medical training from the control of the Royal Colleges’ by the creation of the Postgraduate Medical Education and Training Board (PMETB)...
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Recent statistics indicate that in 2005 the world consumed about 0.5 ZJ (ZJ = 10 Joules) of energy. If one assumes that the future world population stabilizes at 10 billions, and the people consume a similar amount of energy per capita to that of the people in the presently developed countries, the world will need about 2 ZJ a year. A recent survey of the available future energy resources indic...
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ژورنال
عنوان ژورنال: Nature
سال: 1919
ISSN: 0028-0836,1476-4687
DOI: 10.1038/102366b0