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Now showing items 145 - 160 of 28313

  • Energetic Properties and Electronic Structure of [C,N,O,P] and [C,N,S,P] Isomers

    Finney, Brian   Thanthiriwatte, K. Sahan   Francisco, Joseph S.   Dixon, David A.  

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  • On Elementary Bounds for $\\sum\\nolimits_{k=n}^\\infty{{k^{-s}}}$

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  • 6d N =3D (1,0) theories on T-2 and class S theories. Part I

    Ohmori, Kantaro   Shimizu, Hiroyuki   Tachikawa, Yuji   Yonekura, Kazuya  

    We show that the N =3D (1, 0) superconformal theory on a single M5 brane on the ALE space of type G =3D A(n), D-n, E-n, when compactified on T-2, becomes a class S theory of type G on a sphere with two full punctures and a simple puncture. We study this relation from various viewpoints. Along the way, we develop a new method to study the 4d SCFT arising from the T-2 compactification of a class of 6d N =3D (1, 0) theories we call very Higgsable.
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  • The Cauchy problem of generalized Landau-Lifshitz equation into S~n

    SONG Chong   YU Jie  

    In this paper,we study the Cauchy problem of an integrable evolution system,i.e.,the n-dimensional generalization of third-order symmetry of the well-known Landau-Lifshitz equation.By rewriting this equation in a geometric form and applying the geometric energy method with a forth-order perturbation,we show the global well-posedness of the Cauchy problem in suitable Sobolev spaces.
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  • S=1 in free O(N) vector model/HS duality

    Koch, Robert de Mello   Jevicki, Antal   Jin, Kewang   Rodrigues, Joao P.   Ye, Qibin  

    Following the work of Maldacena and Zhiboedov, we study the implementation of the Coleman-Mandula theorem in the free O(N)/higher spin correspondence. In the bi-local framework we first define an S-matrix for scattering of collective dipoles. Its evaluation in the case of free UV fixed point theory leads to the result S = 1 stated in the title. We also present an appropriate field transformation that is seen to transform away all the nonlinear 1/N interactions of this theory. A change of boundary conditions and/or external potentials results in a nontrivial theory.
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  • Uracyl derivatives functionalized with N-, S-, O-heterocycles

    Krylova, E. S.   Semenov, V. E.   Galyametdinova, I. V.   Akamsin, V. D.   Sharafutdinova, D. R.   Reznik, V. S.  

    Reactions of 1,3-bis(bromopentyl)-5(6)-substituted uracyls with a series of five-membered heterocycles containing in the ring N, S, or O atoms and a mercapto group as a substituent at the carbon atom of the ring afforded uracyl derivatives of acyclic and macrocyclic structure with 2-thiobenzoxazole, 2-thio-5-methyl-1,3,4-thiadiazole, 2-thiobenzimidazole, and 2,5-dithio-1,3,4-thiadiazole fragments. N atoms of benzoxazole and imidazole fragments of compounds obtained undergo alkylation and quaternization with alkyl iodides and alkyl tosylates.
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  • Invariant conformal metrics on $\mathbb{S}^{n}$

    Espinar, José M.  

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  • Optimal cooperative repair strategy for (n=3D2k plus s,k) Suh-Ramchandran code

    Wang, Lisha   Tang, Xiaohu   Ma, Zheng  

    An (n =3D 2k + s,k) Suh-Ramchandran code is shown, where s > 0 is a positive integer, is a minimum storage regeneration code, and can also achieve the optimal repair bandwidth for multiple systematic nodes failure repair.
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  • Rhenium(V) complexes with tridentate P,N,S ligands

    Jennifer Schroer   Ulrich Abram  

    Novel, potentially tridentate ligands with P,N,S donor sets (HLdiethyl and HLmorph) were prepared from reactions of N-(dialkyl)thiocarbamoylbenzimide chlorides with 2-(diphenylphosphinomethyl)aniline. They readily react with (NBu4)[ReOCl4] under formation of air-stable [ReOCl2(LR)] complexes, in which the tridentate ligands coordinate meridionally. A similar coordination mode is observed in the nitridorhenium(V) complex [ReN(OReO3)(PPh3)(Ldiethyl)], which can be obtained from a reaction of [ReNCl2(PPh3)2] and HLdiethyl. The complexes were characterized spectroscopically and by X-ray structure analyses.
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  • Rhenium(V) complexes with tridentate P,N,S ligands

    Jennifer Schroer   Ulrich Abram  

    Novel, potentially tridentate ligands with P,N,S donor sets (HLdiethyl and HLmorph) were prepared from reactions of N-(dialkyl)thiocarbamoylbenzimide chlorides with 2-(diphenylphosphinomethyl)aniline. They readily react with (NBu4)[ReOCl4] under formation of air-stable [ReOCl2(LR)] complexes, in which the tridentate ligands coordinate meridionally. A similar coordination mode is observed in the nitridorhenium(V) complex [ReN(OReO3)(PPh3)(Ldiethyl)], which can be obtained from a reaction of [ReNCl2(PPh3)2] and HLdiethyl. The complexes were characterized spectroscopically and by X-ray structure analyses.
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  • Ruthenium carbonyl-catalysed Si-heteroatom X coupling (X = S, O, N)

    Toh, Chun Keong   Poh, Hwa Tiong   Lim, Ching Si   Fan, Wai Yip  

    Ru-3(CO)(12) has been shown to catalyse the coupling of silanes with thiols, alcohols and amines with turnover number (TON) and turnover frequency (TOF) of up to 200 and 50 h(-1) at 80 degrees C. IR, NMR and mass spectroscopic studies have identified a ruthenium dimer complex, [Ru(CO)(4)(SiEt3)](2) as a likely resting state of the catalyst. A mechanism involving this complex has been proposed for the siliconethiol coupling process. (C) 2012 Elsevier B.V. All rights reserved.
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  • SYNTHESIS OF SOME NOVEL S- AND N,S-SUBSTITUTED CHLOROBUTADIENES

    Ibis, Cemil   Gokmen, Zeliha   Cetin, Zerrin  

    Mono(thio)substituted nitrodienes were synthesized by reactions of 2-nitropentachloro- 1,3-butadiene with some thiols [(tert-butylbenzyl) thio-and 2,3,5,6-tetrafluorophenylthio-] either directly or in ethanol in the presence of sodium hydroxide. N,S-Substituted 1,3-butadienes were obtained from the reaction of the mono(thio)substituted nitrodienes with morpholine and some piperazine derivatives in dichloromethane. Also mono- and di(thio)substituted perchlorobutadienes were synthesized from the reactions of hexachloro-1,3-butadiene with o-aminothiophenol in ethanol in the presence of sodium hydroxide. The structures of the new compounds were characterized by microanalysis and spectroscopic data.
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  • pi-Insertion Reactions of Benzynes into P=N and P=S Double Bonds

    Lopez-Leonardo, Carmen   Raja, Rosalia   Lopez-Ortiz, Fernando   Angel del Aguila-Sanchez, Miguel   Alajarin, Mateo  

    The pi-insertion reactions of in situ generated benzynes into the P=N bonds of N-benzyl and N-aryl iminophosphoranes and the P=S bonds of phosphane sulfides have been examined by using the Kobayashi benzyne precursors, (2-trimethylsilyl)phenyl triflates. The reactions with iminophosphoranes afforded (2-aminophenyl)phosphonium triflates under mild conditions, most probably by a [2+2]/retro [2+2] cycloaddition sequence and further N-protonation by the solvent (CH3CN) or N-phenylation by a second molecule of benzyne. The final products of the analogous reactions with P-OCH3-substituted iminophosphoranes were the respective (2-aminophenyl)phosphane oxides, as result of a final O-demethylation event of the putative phosphonium triflate. The reactions with phosphane sulfides involve a final S-phenylation step to yield (2-phenylthio)phenylphosphonium salts.
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  • Overektomili S??anlarda Alendronat?n B?brek Dokusu üzerindeki Etkileri

    ?EV?K, ?zge   ARSLAN, Ahmet Hamdi  

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  • The Inflection idg. *seh(2)-ur, acidic Liquidity, *neb(h)-s n., Clouds

    Oettinger, Norbert  

    Lengthened grade of root syllables in PIE words was either motivated or came about by analogy. The adjective (star)sh(2)ur-o- > (star)suh(2)ro- > (star)suro-'sour and liquid' is derived from (star)seh(2)-ur n. 'sour fluid' (> Hitt. sehur 'urine'). Here the motivation of the lengthened grade can be guessed: Cuneiform Luvian sihuwa-'sharp, acid' < (star)s<(e)over bar>(2)uo- can be explained as v.ddhi derivation from an earlier (star)seh(2)-u-'sourness, sharpness'. The noun (star)seh(2)-ur has probably been derived from (star)seh(2)uo-. Hieroglyphic Luvian tipas ` sky, heaven' is best derived from a neuter s-stem (star)neb(h)-s n. 'cloud(s)'. Probably there was an early PIE paradigm (star)n (e) over barb(h)-s, gen. (star)neb(h)-s-s, whose genitive was soon replaced. Here we cannot know the motivation of the lengthened grade but it is likely that it was there. In consideration of this neuter stem (star)neb(h)-s it may well be that also the much disputed Old Irish word sid 'fairy mound, peace' goes back to a lengthened grade neuter s-stem (star)sed-s 'domicile, seat'. The suffixal e-grade of neuter nouns in (star)-es/-os stems from the locative of the acrostatic type (star)neb(h)-s.
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  • How Mg2+ ions lower the S(N)2@P barrier in enzymatic triphosphate hydrolysis

    van Bochove, Marc A.   Roos, Goedele   Guerra, Celia Fonseca   Hamlin, Trevor A.   Bickelhaupt, F. Matthias  

    Our quantum chemical activation strain analyses demonstrate how Mg2+ lowers the barrier of the enzymatic triphosphate hydrolysis through two distinct mechanisms: (a) weakening of the leaving-group bond, thereby decreasing activation strain; and (b) transition state (TS) stabilization through enhanced electrophilicity of the triphosphate PPP substrate, thereby strengthening the interaction with the nucleophile.
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