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تعداد نتایج: 4114027  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه زنجان - دانشکده مهندسی برق 1391

از آنجایی که سیگنالهای با مدولاسیون دامنه بطور مستقیم نمی توانند به ورودی تقویت کننده های توان خطی اعمال شوند لذا از ساختار های خاص تقویت کننده توان سوئیچینگ برای جمع کردن دامنه و فاز سیگنال استفاده می شود. در سال 2010 میلادی روش جدیدی برای سیگنالهای با پوش متغیر توسط آقای دانیل سیرا به نام مدل مورد نظر تقویت کننده توان کسکود مدوله شده کلاس e ارائه شد. مزیت اصلی این مدل داشتن توان خروجی با رنج ...

2015
Min Kyu Yang Mee Kum Kim Dong Myung Kim

Dear Editor, In trabeculectomy, maintaining bleb integrity is essential for preventing hypotony, infection, and exposure of the sclera. An amniotic membrane (AM) is often used to manage bleb integrity-related problems such as intraoperative buttonholes [1] and late postoperative bleb leakage [2-4]. Herein we present a case in which a large conjunctival bleb defect (6 × 3 mm) occurred during tra...

Journal: :Hydrology and Earth System Sciences 2022

Abstract. The processes of water storage have not been fully understood in different vegetation zones mountainous areas, which is the main obstacle to further understanding hydrological and improving resource assessments. To understand process soil movement (alpine meadow (AM), coniferous forest (CF), mountain grassland (MG) deciduous (DF)) this study monitored temporal spatial dynamics hydroge...

2014
Soon-Mo Jung Yong Zhou

and Applied Analysis 3 The convergence of the power series ∑∞ m 0 amx m seems not to guarantee the existence of solutions to the inhomogeneous Bessel differential equation 1.4 . Thus, we adopt an additional condition to ensure the existence of solutions to the equation. Theorem 2.1. Let ν be a positive nonintegral number, and let ρ be a positive constant. Assume that the radius of convergence o...

2013
Joonhwan Lee

Proof. (⇒) Let Ω0 = {ω : limn Xn(ω) = X(ω)}. Suppose P (Ω0) = 1. Let > 0 be given. →∞ Let Am = ∩k=m{|Xk − X| ≤ }. Then Am ⊂ Am+1 ∀m and limm P (Am) = P (∪m=1Am) by →∞ continuity of probability measure. For each ω0, there exists m(ω0) such that |Xk(ω0)−X(ω0)| ≤ for all k ≥ m(ω0). Therefore, ∀ω0 ∈ Ω0, ω0 ∈ Am for some m and we can conclude that Ω0 ⊂ ∪m=1Am and 1 = P (Ω0) ≤ P (∪m=1Am) = limm P (A ...

2011
Thomas Nunnemann Bogdan Povh

Deep{inelastic scattering events with a leading neutron have been observed by the H1 experiment at HERA using a forward neutron calorimeter. The calorimeter has been installed in 1996 and covers scattering angles between 0 mrad and < 0:6 mrad. For the rst time at HERA, the semi{inclusive cross section d(ep ! enX)=(dxdQ 2 dE 0) for the production of leading neutrons with transverse momenta p T 2...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ولی عصر (عج) - رفسنجان - دانشکده ریاضی و کامپیوتر 1389

in this thesis we will present three topics. we define approximate fixed points in fuzzy normed spaces. also we obtain some necessary and sufficient conditions on the existence of? -fixed points for ? > 0. at the continue some results about approximate fixed points for a class of non-expansive maps on g-metric spaces are obtained and we define approximate fixed points in partial metric spa...

2011
DOUGLAS ROBINSON MICHAELA HAU COREY E. TARWATER

lOak Creek Lab 0/ Biology, Department 0/ Fisheries and Wildlife, Oregon State University, Corvallis, Oregon 97331, USA; 'Department 0/ Migration & immunoecology, Max Planck institut/iir Ornithologie, D-78315 RadolJzell am Bodensee, Germany; 3Department 0/ Animal Science, University o/California, Davis, California 95616, USA; 'Department o/Natural Resources & Environmental Science, University 0/...

2015
Sadia Kanwal Asma Bano Riffat Naseem Malik

A pot culture experiment was carried out to study the alterations in growth, biochemical activities and cadmium (Cd) uptake by wheat (Triticum aestivum) inoculated with or without arbuscular mycorrhizal (AM) fungi in sterilized soil with addition of different Cd levels (0, 100, 300, 600 mg.kg_1). In Mycorrhizal (M) plants, root colonization rates were significantly lower with the addition of hi...

2015
R. Colin

The mass spectromctnc study of the vaporization of the compounds GeO (hex) and GeO(am) and of the mixture GeO (hex) + Ge(c) made it *Z possible to establish their mode of vaporization: Ge02(hex) GeO(g) + 1/20 (I) n GeO(am) (GeO) (g) (n 1. 2. 3) (II) n n/2 GeOJhex) + n/2 Ge(c) (GeO) (g) (n = 1,2,3) (III) c. n The enthalpies of vaporization are AH° (I) 121. 2± 1.6 kcal/mole AH» (II, n=l) = 53.4 ±...

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