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Fiddler crab females have two small feeding claws while males have only one the other is enlarged and used as a weapon as well as a mate attraction signal. The study was conducted on the small intertidal fiddler crab Uca sindensis in the Abi estuary near Bandar Abbas on the Persian Gulf. Data were collected from September 2007 to August 2008 in order to cover a wide range of ecological conditio...
وجود شهرهای با قدمت زیاد و مشکلات مربوط به شهرسازی بی‌برنامه و گسترش بافت‌های فرسودة شهری باعث شده خطر زمین‌لرزه و تخریب‌های ناشی از آن بسیاری از شهرهای کشور ما را نیز تهدید کند. شهر تهران نیز به عنوان پایتخت کشور و موقعیت مهم و حساس خود، دارای پهنه‌های وسیعی از بافت‌های فرسوده است که اکثر آنها بر روی گسل‌های مهم قرار گرفته‌اند و خطر جدی برای شهر تهران و ساکنان آن دارد. با این ضرورت، پژوهش حاضر...
Salient aspects of the meeting are summarized, including our knowledge of dark matter at different cosmological and astrophysical distance scales, ranging from large-scale structure to the cores of galaxies, and our speculations on particle candidates for dark matter, including neutrinos, neutralinos, axinos, gravitinos and cryptons. Comments are also made on prospects for detecting dark matter...
Recently, we reported that group subjective measures of presence as well as observers’ postural responses are sensitive to increasing the realism of a display with motion content, by the addition of stereoscopic information, using a 20-inch stereoscopic screen with an effective horizontal eld of view of 28 deg. (Freeman, Avons, Meddis, Pearson, & IJsselsteijn , 2000). The experiment presented ...
We present the status and capabilities of the Extensive Air Shower experiment (KASCADE-Grande) which is being realized at Forschungszentrum Karlsruhe through a large collecting area (0.5 km) electromagnetic array (Grande) that will operate jointly with the existing KASCADE detectors. KASCADE-Grande will cover the primary energy range 10 eV < E0 < 10 eV, overlapping with KASCADE around 10 eV, th...
درجهان معاصر، بسیاری از اشکال هنرهای تجسمی نه تنها با اهداف زیبایی‌شناسانه بلکه با تأکید بر فرهنگ بصری، توصیف، تحلیل و تفسیر می‌شوند، در مطالعات فرهنگ بصری، تمرکز در معنای فرهنگی تصویر برتر از ارزش زیبایی‌شناختی آن بوده و روابط فرهنگی بین تصاویر و مخاطب مورد بررسی و کنکاش قرار می‌گیرد، به همین سبب مطالعة فرهنگ بصری، به یک زمینة غالب تحقیق در علوم انسانی و هنر تبدیل شده است. از آنجا که ج...
in our previous work, the effect of use of a water soluble cdi/nhs system as nontoxic cross-linking agent on fabrication of gelatin nanoparticles was investigated. in this research, the effect of variation in some synthetic parameters of gelatin nanoparticles cross-linked by cdi/nhs system such as type of gelatin and formulation of cross- linking agent on their size and distribution was examine...
applications such as high definition viedeo reproduction, portable computers, wireless, and multimedia demand, and ever-increasing need for ligh-frequency high-resolution and low-power analog-to-digital converters. flash, two-step flash, and pipeline convertors are fast but consume large amount of power and require large area. to overcome these problems, successive approximation converter blo...
knowledge of airflow resistance is an important consideration in designing an appro-priate ventilation system and for proper fan selection. an airflow resistance device was designed and fabricated to measure the airflow resistance of potatoes. the device the composed of an air compressor, a rotameter, a cylindrical bin to contain the potatoes and an inclined u-tube manometer. airflow resistance...
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