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Kaneko H Dridi S Tarallo V Gelfand BD Fowler BJ Cho WG Kleinman ME Ponicsan SL Hauswirth WW Chiodo VA Karikó K Yoo JW Lee DK Hadziahmetovic M Song Y Misra S Chaudhuri G Buaas FW Braun RE Hinton DR Zhang Q Grossniklaus HE Provis JM Madigan MC Milam AH Justice NL Albuquerque RJ Blandford AD Bogdanovich S Hirano Y Witta J Fuchs E Littman DR Ambati BK Rudin CM Chong MM Provost P Kugel JF Goodrich JA Dunaief JL Baffi JZ Ambati J 《Nature》2011,471(7338):325-330
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Fromhold TM Patanè A Bujkiewicz S Wilkinson PB Fowler D Sherwood D Stapleton SP Krokhin AA Eaves L Henini M Sankeshwar NS Sheard FW 《Nature》2004,428(6984):726-730
Understanding how complex systems respond to change is of fundamental importance in the natural sciences. There is particular interest in systems whose classical newtonian motion becomes chaotic as an applied perturbation grows. The transition to chaos usually occurs by the gradual destruction of stable orbits in parameter space, in accordance with the Kolmogorov-Arnold-Moser (KAM) theorem--a cornerstone of nonlinear dynamics that explains, for example, gaps in the asteroid belt. By contrast, 'non-KAM' chaos switches on and off abruptly at critical values of the perturbation frequency. This type of dynamics has wide-ranging implications in the theory of plasma physics, tokamak fusion, turbulence, ion traps, and quasicrystals. Here we realize non-KAM chaos experimentally by exploiting the quantum properties of electrons in the periodic potential of a semiconductor superlattice with an applied voltage and magnetic field. The onset of chaos at discrete voltages is observed as a large increase in the current flow due to the creation of unbound electron orbits, which propagate through intricate web patterns in phase space. Non-KAM chaos therefore provides a mechanism for controlling the electrical conductivity of a condensed matter device: its extreme sensitivity could find applications in quantum electronics and photonics. 相似文献
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Nature of the nerve lesion caused by a pneumatic tourniquet 总被引:3,自引:0,他引:3
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W. Lohmann A. J. Moss Jr. W. H. Perkins C. F. Fowler 《Cellular and molecular life sciences : CMLS》1963,19(11):568-569
Zusammenfassung Die Veränderung der Strahlenempfindlichkeit von Katalase durch Diglycyl-glycin wurde spektralphotometrisch untersucht. Die Bestrahlungsdosen variierten zwischen 0–2,7 × 106
r. Der Schutzeffekt lässt sich durch einen Radikal-abfangenden Mechanismus erklären. Strahlenbiologische Folgerungen werden diskutiert. 相似文献
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Martin Fowler 《武汉大学学报:自然科学英文版》2001,6(1-2):12-24
In the past few years there’s been a rapidly growing interest in “lightweight” methodologies. Alternatively characterized as an antidote to bureaucracy or a license to hack they’ve stirred up interest all over the software landscape. In this essay I explore the reasons for lightweight methods, focusing not so much on their weight but on their adaptive nature and their people-first orientation. I also give a summary and references to the processes in this school and consider the factors that should influence your choice of whether to go down this newly trodden path. 相似文献