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باتوجه به اینکه اخیرا یکسوکنندهها در سیستمهای توزیع الکتریکی کاربرد بسیاری پیدا کردهاند، مدلسازی آنها نیز از دیدگاه مصرف کننده هایdc مورد توجه زیادی قرار گرفته است. تا کنون در این راستا مدلسازی یکسوکننده های 12پالس و 18 پالس با استفاده از روشهای متوسط گیری انجام شده است. از سوی دیگر به منظور کاهش هارمونیک های ناشی از وجود یکسوکننده ها (هم در قسمت ولتاژ بارdc وهم در قسمت جریان منبع تغذیه ac ) یک...
Chaotic attractors contain unstable periodic orbits of any desired period (this is shown in chapter 22 for Axiom A attractors). Furthermore, for an ergodic attractor we know that any trajectory will eventually come arbitrarily close to any of these orbits. This offers the opportunity for controlling chaos: when the chaotic orbit approaches the unstable periodic orbit of interest it can be attra...
The title compound, C(16)H(14)Cl(2)N(4), is isomorphous with 2,9-dimethyl-6H,13H-5:12,7:14-dimethano-dibenzo[d,i]-[1,3,6,8]tetra-azecine [Rivera et al. (2009 ▶). Acta Cryst. E65, o2553] and has twofold symmetry, with two carbon atoms located on a twofold axis. Only van der Waals forces occur between molecules in the crystal. In the isomorphous compound the crystal structure is stabilized by wea...
1.1 MYSTIFICATION = Distortions of perceptions of reality that mask/obscure that reality. Ideological practices produce human beings as social subjects by transforming “lived experiences” into subjectivity. Mystification concerns the ways in which cognitive understandings of “what exists” are formed out of our lived experiences, formed in such a way that they distort and mask the way the social...
By developing and maintaining mutually rewarding relationships with selected groups of patients and other partners, pharmacists can more effectively market pharmacy services.
The title compound, C(31)H(50)O, a tetra-cyclic triterpene, was isolated from Ainsliaea henryi. The mol-ecule contains a three-membered ring, a five-membered ring, which exhibits an envelope conformation, and three six-membered rings, which adopt chair conformations.
In June 2013, Mount Fuji was nominated as a UNESCO World Heritage site. Subsequently, a new system was piloted encouraging climbers to make a donation of 1000 JPY to help improve environmental conservation. This research is part of a larger study from 2008 to 2014 monitoring the characteristics and behaviour of Fuji climbers. Specifically, this paper investigates Japanese and international clim...
Today we examine the zig-zag product introduced by Reingold, Vadhan, and Wigderson [2] and Capalbo, Reingold, Vadhan, and Wigderson [1]. The product leads to a remarkable constructioon of expander graphs needed in the Spiser-Spielman code. In addition, their works introduce a probabilistic viewpoint of expansion. In previous literature, the spectral techniques are used to analyze the expansion ...
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