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101.
The first total synthesis of (+/-)-actinophyllic acid (1) is reported. Key steps of this synthesis include an intramolecular oxidative coupling of ketone and malonic ester enolates and an aza-Cope-Mannich rearrangement that assembled the core structure of the natural product's unique ring system. The synthesis was accomplished from di-tert-butyl malonate in 8% overall yield by a concise sequence that proceeds by way of only seven isolated intermediates. 相似文献
102.
The coupling of individual atoms to a high-finesse optical cavity is precisely controlled and adjusted using a standing-wave dipole-force trap, a challenge for strong atom-cavity coupling. Ultracold Rubidium atoms are first loaded into potential minima of the dipole trap in the center of the cavity. Then we use the trap as a conveyor belt that we set into motion perpendicular to the cavity axis. This allows us to repetitively move atoms out of and back into the cavity mode with a repositioning precision of 135 nm. This makes it possible to either selectively address one atom of a string of atoms by the cavity, or to simultaneously couple two precisely separated atoms to a higher mode of the cavity. 相似文献
103.
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Adeva B Becker U Becker-Szendy R Berdugo J Boehm A Branson JG Burger JD Capell M Cerrada M Chang CC Chang YH Chen HS Chen M Chen ML Chen MY Deffur E Demarteau M Dong BZ Duinker P Fesefeldt HS Fong D Fukushima M Garrido L Han RD Harting D Herten G Ho MC Hueser D Hussain M Ilyas MM Jiang DZ Krenz W Kuijer P Li QZ Linnhoefer D Luckey D Luit EJ Mana C Marquina MA Martinez M Massaro GG Mnich J Mount R Nadeem K Newman H Pohl M Poschmann FP Rau RR Rodriguez S Rohde M Rubio JA Rykaczewski H Salicio J 《Physical review letters》1985,54(16):1750-1753
106.
Relaxation of the Navier–Stokes–Korteweg equations for compressible two‐phase flow with phase transition 下载免费PDF全文
The Navier–Stokes–Korteweg (NSK) system is a classical diffuse‐interface model for compressible two‐phase flow. However, the direct numerical simulation based on the NSK system is quite expensive and in some cases even not possible. We propose a lower‐order relaxation of the NSK system with hyperbolic first‐order part. This allows applying numerical methods for hyperbolic conservation laws and removing some of the difficulties of the original NSK system. To illustrate the new ansatz, we first present a local discontinuous Galerkin method in one and two spatial dimensions. It is shown that we can compute initial boundary value problems with realistic density ratios and perform stable computations for small interfacial widths. Second, we show that it is possible to construct a semi‐discrete finite‐volume scheme that satisfies a discrete entropy inequality. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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Summary. Based on Nessyahu and Tadmor's nonoscillatory central difference schemes for one-dimensional hyperbolic conservation laws
[16], for higher dimensions several finite volume extensions and numerical results on structured and unstructured grids have
been presented. The experiments show the wide applicability of these multidimensional schemes. The theoretical arguments which
support this are some maximum-principles and a convergence proof in the scalar linear case. A general proof of convergence,
as obtained for the original one-dimensional NT-schemes, does not exist for any of the extensions to multidimensional nonlinear
problems. For the finite volume extension on two-dimensional unstructured grids introduced by Arminjon and Viallon [3,4] we
present a proof of convergence for the first order scheme in case of a nonlinear scalar hyperbolic conservation law.
Received April 8, 2000 / Published online December 19, 2000 相似文献
109.
Jensen H. Meyer-Gossler G. Rohde H. 《Zeitschrift für Physik A Hadrons and Nuclei》1938,110(5-6):277-290
Zeitschrift für Physik A Hadrons and nuclei - Der von den Mineralogen eingefÜhrte Brauch, die Gitterkonstanten der Ionenkristalle formal in Beiträge der einzelnen Ionen zu zerlegen... 相似文献
110.