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21.
Time-dependent two-dimensional magnetohydrodynamic simulations are carried out for tokamak plasmas with edge poloidal flow. Differently from conventional equilibrium theory, a density pedestal all around the edge is obtained when the poloidal velocity exceeds the poloidal sound speed. The outboard pedestal is induced by the transonic discontinuity, the inboard one by mass redistribution. The density pedestal follows the formation of a highly sheared flow at the transonic surface. These results may be relevant to the L-H transition and pedestal formation in high performance tokamak plasmas. 相似文献
22.
A new technique is proposed to improve information confidentiality in optical-fiber communications without bandwidth consumption. A pseudorandom vectorial sequence was generated by a dynamic system algorithm and used to codify a multi-level polarization modulation based on the Stokes vector. Optical-fiber birefringence, usually considered as a disturbance, was exploited to obfuscate the signal transmission. At the receiver end, the same pseudorandom sequence was generated and used to decode the multi-level polarization modulated signal. The proposed scheme, working at the physical layer, provides strong information security without introducing complex processing and thus latency. 相似文献
23.
Monitoring of depth distribution of trace elements by GDMS 总被引:1,自引:0,他引:1
L. Aldave de las Heras O. L. Actis-Dato M. Betti E. H. Toscano U. Tocci R. Fuoco S. Giannarelli 《Microchemical Journal》2000,67(1-3)
The depth distribution of B and Li have been studied in ZrO2 layers by GDMS. Zr alloy has been corroded to ZrO2 in an autoclave in solutions containing Li and B. Samples were collected at different reaction times and analyzed. The GDMS crater depth and the sputter rate could be determined by profilometry for the discharge conditions used. In the analyzed samples three zones could be identified: oxide, interface and zircaloy. The concentration of Li and B was followed in each of the three zones. 相似文献
24.
We review three examples of quasi-exactly solvable Hamiltonians which possess multiple algebraisations. This includes the most prominent example, the Lamé equation, as well as recently studied many-body Hamiltonians with Weierstrass interaction potential and, finally, a 2×2 coupled channel Hamiltonian. 相似文献
25.
M. K. Pham M. Betti P. P. Povinec M. Benmansour V. B��nger J. Drefvelin C. Engeler J. M. Flemal C. Gasc�� J. Guillevic R. Gurriaran M. Groening J. D. Happel J. Herrmann S. Klemola M. Kloster G. Kanisch K. Leonard S. Long S. Nielsen J.-S. Oh P. U. Rieth I. ?stergren H. Pettersson N. Pinhao L. Pujol K. Sato J. Schikowski Z. Varga V. P. Vartti J. Zheng 《Journal of Radioanalytical and Nuclear Chemistry》2011,288(2):603-611
A new certified reference material (CRM) for radionuclides in sea water from the Irish sea (IAEA-443) is described and the results of the certification process are presented. Ten radionuclides (3H, 40K, 90Sr, 137Cs, 234U, 235U, 238U, 238Pu, 239+240Pu and 241Am) have been certified, and information values on massic activities with 95% confidence intervals are given for four radionuclides (230Th, 232Th, 239Pu and 240Pu). Results for less frequently reported radionuclides (99Tc, 228Th, 237Np and 241Pu) are also reported. The CRM can be used for quality assurance/quality control of the analysis of radionuclides in water samples, for the development and validation of analytical methods and for training purposes. The material is available in 5 L units from IAEA (http://nucleus.iaea.org/rpst/index.htm). 相似文献
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