با توجه به رشد بالای جمعیت در جهان و نیاز اطمینان از امنیت غذایی، افزایش تولید واحد سطح محصولات زراعی به‌منزلة راهبردی اساسی حل مسئلة تأمین غذا به‌شمار می‌رود. سوی دیگر، وجود محدودیت زیرکشت پایین‌بودن میانگین عملکرد برخی کشاورزی مانند گندم کشور، محصول می‌تواند راهکاری عملی پاسخ کشور محسوب شود. یکی مهم‌ترین بیماری‌های فوزاریوم است که، نقش پیش‌بینی این بیماری جلوگیری کاهش بهره‌وری محصول، مدل‌هایی...

We present a general method for using automatic diierentiation to facilitate model sensitivity analysis. Automatic diierentiation techniques augment, in a completely mechanical fashion, an existing code such that it also simultaneously and eeciently computes derivatives. Our method allows the sensitivities of the code's outputs to its parameters and inputs to be determined with minimal human ee...

Polar MM5, a mesoscale atmospheric model optimized for use over polar ice sheets, is employed to simulate Antarctic accumulation in recent decades. Two sets of simulations, each with different initial and boundary conditions, are evaluated for the 17yr period spanning 1985-2001. The initial and boundary conditions for the two sets of runs are provided by the (i) European Centre for Medium-Range...

during the last several years, application of numerical weather prediction models in the country have become common in both research and operations, even though systematic verification of the models’ results using statistical methods has rarely been conducted (sodoudi et al. 2009). this paper aims at comparing the mm5 24-hour precipitation forecasts with the corresponding observations using sta...

in this research the effect and importance of horizontal resolution in mesoscale numerical model of mm5 on quality and magnitude of some atmospheric variables has been discussed. a case study was also carried out to verify the results of the findings. the case occurred in an unusually cold winter. this case was activated in the north of iran during 12-15 october 2004. the main reason for select...