نتایج جستجو برای: 2009 years then
تعداد نتایج: 1807292 فیلتر نتایج به سال:
in this study parasite infestation of cyprinoids farms of golestan province have been studied. for this purpose 16 farms in 2009 and 15 farms in 2008 have been randomly selected, totally 1860 specimens has been studied for 2 years. according to the result of this study% 93.3 and %56.25 of farms had parasite infestations in 2009 and 2008 respectively. trichodina sp has maximum parasite infestati...
1 Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland, 2 University of Basel, Basel, Switzerland, 3 School of Public Health, Imperial College London, London, United Kingdom, 4 Independent consultant, Basel, Switzerland, 5 Swiss Centre for International Health, Swiss Tropical and Public Health Institute, Basel, Switzerland, 6 Department of...
In the classical data envelopment analysis (DEA) models, inputs and outputs are assumed as known variables, and these models cannot deal with unknown amounts of variables directly. In recent years, there are few researches on handling missing data. This paper suggests a new interval based approach to apply missing data, which is the modified version of Kousmanen (2009) approach. First, the prop...
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