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《Science》(化学、材料)连载----(26 September 2008)
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2008 Visualization Challenge Jeff Nesbit and Monica Bradford Science 26 September 2008: 1767. Summary: This year's edition of the annual challenge drew 181 entries from 21 countries. 2008 Visualization Challenge Winners Rachel Zelkowitz Science 26 September 2008: 1768. Summary: Science and the National Science Foundation announce the winners and honorable mentions in the categories of photography, illustration, informational graphics, interactive media, and noninteractive media in this year's International Science & Engineering Visualization Challenge. PHYSICS: For Quantum Information, Two Wrongs Can Make a Right Jonathan Oppenheim Science 26 September 2008: 1783-1784. Summary: A channel too noisy to send quantum information can send secret messages, and, when combined with a similarly noisy channel, can reliably send quantum states. CHEMISTRY: Nonlinear Thinking About Molecular Energy Transfer Richard M. Stratt Science 26 September 2008: 1789-1790. Summary: Although solvent molecules move about randomly in a liquid, an experiment showed that changing their initial arrangement affected the rate of a chemical process. Quantum Communication with Zero-Capacity Channels Graeme Smith and Jon Yard Science 26 September 2008: 1812-1815. Published online 21 August 2008 [DOI: 10.1126/science.1162242] (in Science Express Reports) Two quantum communication channels, each of which is so noisy that it has zero capacity to independently transmit information, can do so when used together. Synthesis and Solid-State NMR Structural Characterization of 13C-Labeled Graphite Oxide Weiwei Cai, Richard D. Piner, Frank J. Stadermann, Sungjin Park, Medhat A. Shaibat, Yoshitaka Ishii, Dongxing Yang, Aruna Velamakanni, Sung Jin An, Meryl Stoller, Jinho An, Dongmin Chen, and Rodney S. Ruoff Science 26 September 2008: 1815-1817. Solid-state nuclear magnetic resonance study of graphite oxide made with 100 percent carbon-13 reveals a complex bonding network involving several carbon species. Linear Response Breakdown in Solvation Dynamics Induced by Atomic Electron-Transfer Reactions Arthur E. Bragg, Molly C. Cavanagh, and Benjamin J. Schwartz Science 26 September 2008: 1817-1822. A solvent equilibrates faster around a sodium-electron ion pair formed from Na+ than from Na-, violating a widely used approximation for modeling solvent dynamics. 下载地址：http://www.namipan.com/d/7a9fc66 ... 7c828990ba7c7623500 |
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3楼2008-10-01 18:07:21
Science (3 October 2008 )
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CHEMISTRY: A Light Touch Catalyzes Asymmetric Carbon-Carbon Bond Formation Philippe Renaud and Paul Leong Science 3 October 2008: 55-56. Summary: The cooperation between a photoactivated catalyst and an organocatalyst enables a so far elusive stereoselective synthetic transformation. BIOCHEMISTRY: Not Comparable, But Complementary Lars Juhl Jensen and Peer Bork Science 3 October 2008: 56-57. Summary: New studies increase the number of protein-protein interactions but show little overlap. This is not a bad thing, though. Ultrafast X-ray Thomson Scattering of Shock-Compressed Matter Andrea L. Kritcher, Paul Neumayer, John Castor, Tilo Döppner, Roger W. Falcone, Otto L. Landen, Hae Ja Lee, Richard W. Lee, Edward C. Morse, Andrew Ng, Steve Pollaine, Dwight Price, and Siegfried H. Glenzer Science 3 October 2008: 69-71. A transient x-ray source reveals rapid structural changes in LiH as a high-powered laser produces extreme compression and heating, inducing an insulator-to-metal transition. Time Reversal and Negative Refraction J. B. Pendry Science 3 October 2008: 71-73. Published online 28 August 2008 [DOI: 10.1126/science.1162087] (in Science Express Reports) Optically active materials with nonlinear optical properties are predicted to mimic negatively refractive materials but without losses associated with true negative refraction. Surface-Modified Carbon Nanotubes Catalyze Oxidative Dehydrogenation of n-Butane Jian Zhang, Xi Liu, Raoul Blume, Aihua Zhang, Robert Schlögl, and Dang Sheng Su Science 3 October 2008: 73-77. Carbon nanotubes decorated with phosphate groups can catalyze the partial oxidation of alkanes, a process that has normally required complex metal oxides. Merging Photoredox Catalysis with Organocatalysis: The Direct Asymmetric Alkylation of Aldehydes David A. Nicewicz and David W. C. MacMillan Science 3 October 2008: 77-80. Published online 4 September 2008 [DOI: 10.1126/science.1161976] (in Science Express Reports) When irradiated by light, a ruthenium-organic catalyst creates intermediates with unpaired electrons that undergo otherwise intractable asymmetric reactions. Temperature-Induced Hydrophobic-Hydrophilic Transition Observed by Water Adsorption Hai-Jing Wang, Xue-Kui Xi, Alfred Kleinhammes, and Yue Wu Science 3 October 2008: 80-83. A detailed gas record from the Byrd ice core from 90,000 to 20,000 years ago shows that warming episodes tracked high CO2 levels in Antarctica but lagged by several thousands of years in Greenland. 下载地址：http://www.namipan.com/d/c42edcd ... 49d7cd48b026f032400 |
4楼2008-10-04 13:29:41
5楼2008-10-05 12:42:33
Science (10 October 2008)
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NOBEL PRIZE IN PHYSICS: Trio of Particle Theorists Lauded Adrian Cho Science 10 October 2008: 175. Summary: This year's Nobel Prize in physics honors Yoichiro Nambu, Makoto Kobayashi, and Toshihide Maskawa for discoveries in particle physics. PHYSICS: Cold Molecules Beat the Shakes P. L. Gould Science 10 October 2008: 203-204. Summary: Due to their relative complexity, molecules have been harder to cool than atoms, but that is beginning to change. A High Phase-Space-Density Gas of Polar Molecules K.-K. Ni, S. Ospelkaus, M. H. G. de Miranda, A. Pe'er, B. Neyenhuis, J. J. Zirbel, S. Kotochigova, P. S. Julienne, D. S. Jin, and J. Ye Science 10 October 2008: 231-235. Published online 18 September 2008 [DOI: 10.1126/science.1163861] (in Science Express Research Articles) Raman laser irradiation can cool a cloud of KRb molecules to ultralow translational, vibrational, and rotational temperatures, a step toward forming molecular condensates. Cavity Optomechanics with a Bose-Einstein Condensate Ferdinand Brennecke, Stephan Ritter, Tobias Donner, and Tilman Esslinger Science 10 October 2008: 235-238. Published online 11 September 2008 [DOI: 10.1126/science.1163218] (in Science Express Reports) Coupling a Bose-Einstein condensate to an optical cavity holding a few trapped photons provides a sensitive probe of mechanical oscillations in the quantum regime. Carbon Nanotube Arrays with Strong Shear Binding-On and Easy Normal Lifting-Off Liangti Qu, Liming Dai, Morley Stone, Zhenhai Xia, and Zhong Lin Wang Science 10 October 2008: 238-242. Like gecko feet, a disordered array of carbon nanotubes with curly entangled tops can grip vertical surfaces without slipping but can also release and reattach easily. 下载地址：http://www.namipan.com/d/48071d8 ... 5461fd8622e18394c00 |
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