نتایج جستجو برای: loss
تعداد نتایج: 445895 فیلتر نتایج به سال:
طراحی و شبیه سازی یک شیفت دهنده فاز میکرو الکترومکانیکی 6 بیتی در باند x مورد بررسی قرار گرفته است. در طراحی این شیفت دهنده ساختار به نسبت جدیدی را با ادغام دو ساختار dmtl و switched-line ارایه داده¬ایم. با توجه به نتایج شبیه سازی، میانگین return loss و insertion loss برای تمامی 64 حالت شیفت فاز در فرکانس ghz 7/9 به ترتیب برابر db 22- و db 06/0- است. همچنین در این فرکانس مقدار موثر خطای فاز برا...
introduction: children learn to communicate by hearing sounds. if there is hearing loss, the cognitive and speaking abilities and language learning will deteriorate. early detection and intervention are important factors in the successful treatment of hearing loss in children. hearing loss (hl) is divided into two main groups: conductive hearing loss (chl) and sensorineural hearing loss (snhl),...
هدف: بیماری های چشمی مجموعه ای از بیماری های موثر بر بینایی هستند که سبب اختلال در زندگی روزمره افراد شده و نیاز به توجه ویژه ای دارند. امروزه از آزمون های مختلفی جهت بررسی سیر و شدت اختلال در بینایی در مبتلایان به بیماری های چشمی مختلف استفاده می شود. یکی از این آزمون ها، آزمون پتانسیل برانگیخته از بینایی است. بر همین اساس بر آن شدیم تا در این مطالعه به بررسی منحنی های مختلف پتانسیل برانگیخته ...
post cardiac surgery ophthalmic complications are uncommon, and sudden visual loss is one of the most important ophthalmic problems in these patients. we report a 54-year-old woman that suffered transient sudden bilateral visual loss seven days after orthotopic heart transplantation. in ophthalmologic examination positive findings were bilateral normal size pupils without direct and indirect pu...
in this thesis, barium ferrite nano particles were prepared by sol-gel method. their structural and magnetic properties of samples have been investigated using thermo gravimetric analysis (tg-dta), x-ray powder diffractometer (xrd), fourier transform infrared (ftir), scanning electron microscopy (sem), field emission scanning electron microscopy (fesem), ac susceptometer, vibrating sample magne...
background: taxi drivers have the most important role in the public transport services. they are exposed to various harmful agents and occupational hazards. noise is a harmful occupational factors and hearing loss is its most important effect. protection of drivers against hearing loss is essential. this study was performed to determine the prevalence of hearing loss among taxi and agency drive...
Assembly Line production is one of the widely used basic principles in production system. The problem of Assembly Line Balancing deals with the distribution of activities among the workstations so that there will be maximum utilization of human resources and facilities without disturbing the work sequence. Research works reported in the literature mainly deals with minimization of idle time i.e...
assembly line production is one of the widely used basic principles in production system. the problem of assembly line balancing deals with the distribution of activities among the workstations so that there will be maximum utilization of human resources and facilities without disturbing the work sequence. research works reported in the literature mainly deals with minimization of idle time i.e...
the probability of losing a customer in m/g/n/0 and gi/m/n/0 loss queuing systems withheterogeneous servers is minimized. the first system uses a queue discipline in which a customer who arriveswhen there are free servers chooses any one of them with equal probability, but is lost otherwise. providedthat the sum of the servers rates are fixed, loss probability in this system attains minimum val...
hearing loss (hl) is the most common sensory defect. various genetic as well as environmental factors have been shown to contribute in it. more than 100 loci have been recognized to cause autosomal recessive nonsyndromic hearing loss (arnshl). here, we report a 6-year old female patient with bilateral pre-lingual hl in whom a mutation has been identified in triobp gene (c.6362c>t, s2121l). in s...
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