نتایج جستجو برای: n 24
تعداد نتایج: 1267884 فیلتر نتایج به سال:
In the title compound, [Zn(2)(C(36)H(42)N(4)O(2))(CH(3)COO)(2)]·2CH(3)CH(2)OH, a centrosymmetric dinuclear zinc macrocyclic complex is accompanied by two half-occupied ethanol solvent molecues resulting in a 1:2 macrocycle-solvent composition. The Zn(II) atom has a square-pyramidal geometry arising from an N(2)O(3) donor set, being coordinated by two N atoms and two O atoms from the macrocyclic...
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...
The title compound, [Cu(2)(C(31)H(30)Cl(2)N(4)O(4))Cl(2)]·CH(3)CN, was synthesized by cyclo-condensation between N,N'-bis-(2-fur-yl)-N,N'-bis-(3-formyl-5-chloro-salicylaldehyde)ethyl-enediamine and 1,3-diamino-propane in the presence of Cu(II) ions. It is an unsymmetrical dinuclear Cu(II) complex. The coordination geometry for each Cu(II) atom can be discribed as distorted square-pyramidal. The...
How and when India collided with Asia is crucial for global climate and continental dynamics. We present new palaeomagnetic data showing that the Xigaze forearc basin of southern Tibet was located at 24.2 ± 5.9°N during 54-57 Ma, providing a direct constraint on the position of the southernmost margin of Asia at this crucial stage. Our study suggests 1) the age and locus of the initial India-As...
The synthesis of 4,7,10,13,16,19-docosahexaenoic acid (22:6(n-3)) requires that when 6,9,12,15,18,21-tetracosahexaenoic acid (24:6(n-3)) is produced in the endoplasmic reticulum, it preferentially moves to peroxisomes for one cycle of beta-oxidation rather than serving as a substrate for membrane lipid synthesis. Both 24:6(n-3) and its precursor, 9,12,15,18,21-tetracosapentaenoic acid (24:5(n-3...
Sometimes, it is possible to represent a complicated polytope as projection of much simpler polytope. To quantify this phenomenon, the extension complexity P P </mml...
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...
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