نتایج جستجو برای: significant trend in climatic means

تعداد نتایج: 17038676  

2005
Zhi-Jun Liu George R. Hallberg Dale L. Zimmerman Robert D. Libra

Many studies of ground water pollution in general and nitrate contamination in particular have often relied on a one-time investigation, tracking of individual wells, or aggregate summaries. Studies of changes in spatial distribution of contaminants over time are lacking. This paper presents a method to compare spatial distributions for possible changes over time. The large-scale spatial distri...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه یزد 1388

this study considers the level of increase in customer satisfaction by supplying the variant customer requirements with respect to organizational restrictions. in this regard, anp, qfd and bgp techniques are used in a fuzzy set and a model is proposed in order to help the organization optimize the multi-objective decision-making process. the prioritization of technical attributes is the result ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه مازندران 1388

some researches made in the field of agency problem issue, deal with the role of control systems regarding owners and managers. in this research the relationship between the two control mechanisms, namely the voluntary disclosure (external control mechanism) and outside directors (internal control mechanism), which are reductive of agency problems, has been studied. for this reason, a sample ...

Journal: :اکو هیدرولوژی 0
نگین بینش دانشجوی دکترای مهندسی محیط زیست ـ منابع آب، دانشگاه تهران محمدحسین نیک سخن دانشیار دانشکدۀ محیط زیست دانشگاه تهران امین سارنگ استادیار دانشکدۀ محیط زیست دانشگاه تهران

rainfall and flow rate are of the most important climatic and hydrologic parameters whose investigation and determination of their behavior are of great importance in water resources management. one of the most suitable methods available for assessment of hydro-climatological conditions in the watershed is trend analysis which is used to examine the changes of a variable during time. current st...

2016
Jiaxin Jin Ying Wang Min Cheng Audrey L. Mayer

Intact Forest Landscape (IFL) is of great value in protecting biodiversity and supporting core ecological processes. It is important to analyze the spatial variation in the growth dynamics of IFL. This study analyzed the change of the Normalized Difference Vegetation Index (NDVI) during the growing season (April–October) for boreal (45 ̋ N–70 ̋ N) IFLs and the correlation with climatic variables ...

پایان نامه :0 1374

having conducted the experiment and analysed the data, the researcher computed the groups mean scores and variances for the test relating to the research question. as the final atep, a t-test was conodonted for the hypothesis. as noted earlier, the significance level was determined at .05 and .01 respectively. the observed t-value was higher than the critical t-value at. 5 and .01 levels. conse...

Journal: :Journal of Environmental Science and Natural Resources 2012

خوش روش, مجتبی, میرناصری, محمد, پسرکلو, مهسا,

Climate scientists have concluded that the air temperature of earth’s surface warmed to 0.6 during the 20th century, and that warming induced by increasing concentrations of greenhouse gases accompanied by changes in the precipitation and hydrologic cycle. Monthly, seasonal and annual precipitation trends of meteorological stations have been analyzed and interpolated in the northern part of Ira...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده ادبیات و علوم انسانی دکتر علی شریعتی 1389

the current study examined iranian undergraduate efl students’ willingness to communicate with regard to their vocabulary knowledge. in general, participants were somewhat willing to communicate in english. the total mean score of 730 university students’ perception of willing to communicate was 83.53 out of 135. results, regarding four parts of willingness to communicate, revealed that part...

Journal: :محیط شناسی 0
محمدجواد امیری استادیار گروه برنامه ریزی و مدیریت و آموزش محیط زیست، دانشکدۀ محیط زیست، دانشگاه تهران، ایران، عبدالرضا کرباسی دانشیار گروه مهندسی محیط زیست، دانشکدۀ محیط زیست، دانشگاه تهران، ایران محمود ذوقی دانشجوی کارشناسی ارشد گروه برنامه ریزی و مدیریت و آموزش محیط زیست، دانشکدۀ محیط زیست، دانشگاه تهران، ایران مهدیس سادات دانشجوی کارشناسی ارشد گروه برنامه ریزی و مدیریت و آموزش محیط زیست، دانشکدۀ محیط زیست، دانشگاه تهران، ایران،

introduction: climate change is one of the most significant challenges in sustainable development that has negative effects on land and marine ecosystems. this phenomenon leads to imbalances that cause effects including hydrological changes, increased soil erosion, increased runoffs and reduced groundwater aquifer feeding, etc. effects of climate changes over the past decade have significantly ...

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