نتایج جستجو برای: Reduction
تعداد نتایج: 491783 فیلتر نتایج به سال:
a significant problem in multicarrier communication systems is the necessity to reduce the value of papr (peak-to-average power ratio) of transmitting signal. in this thesis we study the effect of the system parameters such as coding and modulation types on papr and ultimate ber in a mc-cdma system. in this study we consider fading channel as well as the nonlinearity of transmitter’s amplifier ...
in this research we have studied the effect of some transition-metals (cu, ag and au) substitutions on two-electron reduction potential of flavins by application of dft method. all geometries have been optimized at blyp level of theory and “6-31+g** + lanl2dz” mixed basis set. the frequency job at the same method and basis sets has been performed to obtain gibbs free energy of compounds. it h...
abstract previous researches have shown success of growth hormones usage on flower production increase, pod and prevention of abscission of them in some of the pulses. two tests were done, in order to find out the effects of growth hormones to on flower production increase, pod and chick pea yield composites in farmer conditions (2010-11) and green house conditions as factorial on the proje...
1- in a search directed to the reaction of compound)23(the cycloaddition reaction of 1,3- diphenylisobenzofurane)14(with p-benzoquinone)19(,followed by addition of cyclopentadiene was carried out.the specific spacial stracture of its ir,nmr,mass spectra. 2- in another attempt the kinetic stability and behavior of compounds)20(and)23(was studied.the main subject of this study was the highly reve...
126 abstract: in this research we studied the effects of cyclic hydration and dehydration of cysts of artemia urmiana and artemia parthenogenetica on the hatching percentage, survival and growth. the experiment was carried out in 3 treatments (1-3 hydration/dehydration cycles) with 3 replicates for each treatment. later effects of cold preservation at -20°c during three time periods were ...
این تکنیک طی 20 سال گذشته در درمان شکستگی های رایج فک و صورت مورد استفاده بوده است . زیرا عفونت کمتری را داراست . این تکنیک مخصوصا" برای بیماران فاقد همکاری، بیمارانی که نیاز به تحرک سریع فک دارند و یا نیاز سریع برای دسترسی به حفره دهان دارند(بیماران icu )، بیماران با نیازهای تغذیه ای خاص از جمله افراد دیابتی و الکلیک ، افرادی که شکستگی عفونی داشته و نیاز به open reduction دارند، افراد دچار بیم...
many studies have been done on hybrid vehicles in the past few years. the full hybrid vehicles need a large number of batteries creating up to 300 (v) to meet the required voltage of electric motor. the size and weight of the batteries cause some problems. this research investigates the mild hybrid vehicle. this vehicle includes a small electric motor and a high power internal combustion engine...
the present study attempted to discover the impact of reduction recasts on the improvement of the speaking ability and on the repaired grammatical uptake rates of iranian intermediate level efl learners. after administering a language proficiency test, 52 homogeneous students were randomly assigned to the experimental and control group. the comparison of the two groups on the speaking pretest c...
the main problem of solid waste management system in tehran is to handle a large amount of waste (7.641 ton/day in 2008). therefore, source reduction can be introduced as one of the first priority for solid waste management in tehran. this research represents the first attempt to quantify the source reduction potential in the city, and subsequently, outlines the principle guidelines, legislatio...
یکی از مهمترین روشهای تحلیل سازه ها در مهندسی مکانیک استفاده از مدل المان محدود است که اعتبار سنجی مدل مذکور، اهمیت بسزایی دارد. بدین منظور معمولا سازه مورد نظر را بصورت تجربی تحت تست آنالیز مودال قرار می دهند که مسلما فرکانس ها و شکل مود استخراجی با نظایر استخراج شده در مدل المان محدود اختلاف دارد. برای به حد اقل رساندن این اختلاف از روش های موسوم به مدل بروز رسا نی شده ) ( model updatingاستفا...
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