نتایج جستجو برای: 060 depth have negative effects

تعداد نتایج: 4465250  

2017
Rachel E Mallinger Hannah R Gaines-Day Claudio Gratton

Managed bees are critical for crop pollination worldwide. As the demand for pollinator-dependent crops increases, so does the use of managed bees. Concern has arisen that managed bees may have unintended negative impacts on native wild bees, which are important pollinators in both agricultural and natural ecosystems. The goal of this study was to synthesize the literature documenting the effect...

Journal: :Journal of vision 2015
Ryuji Takeya Tetsuko Kasai

Attention directed to a part of an object tends to obligatorily spread over all of the spatial regions that belong to the object, which may be critical for rapid object-recognition in cluttered visual scenes. Previous studies have generally used simple rectangles as objects and have shown that attention spreading is reflected by amplitude modulation in the posterior N1 component (150-200 ms pos...

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده علوم انسانی 1390

this study investigated the effects of manipulating the cognitive complexity of tasks along +/- few elements and the time limits on l2 learners writing performance. to conduct the study, 60 iranian efl learners with two levels of proficiency, low and high intermediate, were selected and assigned to three groups based on the time devoted to task completion. the participants performed both a simp...

The main objective of this paper is to investigate the asymmetric effects of exchangerate on Iranian import price index using quarterly time series data over the period 1990- 2011. For this purpose, positive and negative shocks of the exchange rate have been separated from each other using dummy variables and the effects of the size of the exchange rate shocks by determining a threshold.The emp...

Journal: :تحقیقات اقتصادی 0
اکبر کمیجانی استاد دانشکده‎ی اقتصاد دانشگاه تهران فائزه مشهدی احمد کارشناس ارشد اقتصاد دانشکده‎ی اقتصاد دانشگاه تهران

in the recent economic literature, an important finding is the causal relationship between financial development and economic growth. before the 1970s, the most of economists believed that economic growth could be reached only by accumulation of physical capital. in the 1970s and after the pioneering works of mckinon (1973) and shaw (1973), this orthodox view was criticized by a vast amount of ...

Journal: :Human Factors and Ergonomics in Manufacturing 2007

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