The sowing density on oat productivity indicators

the effect of traffic density on the accident externality from driving the case study of tehran

در این پژوهش به بررسی اثر افزایش ترافیک بر روی تعداد تصادفات پرداخته شده است. به این منظور 30 تقاطع در شهر تهران بطور تصادفی انتخاب گردید و تعداد تصادفات ماهیانه در این تقاطعات در طول سالهای 89-90 از سازمان کنترل ترافیک شهر تهران استخراج گردید و با استفاده از مدل داده های تابلویی و نرم افزار eviews مدل خطی و درجه دوم تخمین زده شد و در نهایت این نتیجه حاصل شد که تقاطعات پر ترافیک تر تعداد تصادفا...

Research output indicators are not productivity indicators

the effect of creative writing instruction on lexical density of advanced efl learners writing

چکیده ندارد.

Influence of Time of Sowing on Productivity and Seed Quality in Babchi (Psoralea corylifolia L.)

An experiment was conducted to evaluate the effect of different sowing time on seed yield and quality in under used medicinal plant babchi. The study was carried out for 12 months from January to December. Results showed that the seeds sown in November month recorded the maximum seed yield and quality parameters followed by October month than other months. November month recorded the maximum fi...

Productivity, Density, and Sorting

The strong, positive relationship between productivity and density has been used as evidence for the existence of agglomeration forces such as productivity spillovers. This paper presents an alternative hypothesis: In an economic geography model where firms choose locations to be close to their markets, sorting endogenously generates the density-productivity relationship in the absence of any p...