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排序方式: 共有86条查询结果,搜索用时 15 毫秒
21.
Geoffrion J. Gregory B.C. Couture P. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1988,16(3):393-395
A virtual movement of the plasma in the radial direction was studied in order to obtain the magnitude of the vertical field applied to the Tokamak de Varennes plasma for fast horizontal motion using coils inside the vacuum vessel. The developed model includes the radial dependence of several parameters 相似文献
22.
We present a detailed calculation of the contributions of charginos, scalar quarks, and charged Higgs boson to theK
+→π
+
vv andK
L
0
→μ
+
μ
− decays. We include mixings: that of charginos and that of the scalar partners of the left and right handed top quark. We
find that the box contribution to the amplitudes is much smaller than the penguin contribution, which can be ∼10% of the Standard
Model contribution, even for relatively large SUSY masses. The charged Higgs contribution can be as large as 25% of the SM
contribution in the first decay and as much as 40% of the SM contribution in the second decay. 相似文献
23.
24.
We study the multiply-with-carry family of generators proposed by Marsaglia as a generalization of previous add-with-carry families. We define for them an infinite state space and focus our attention on the (finite) subset of recurrent states. This subset will, in turn, split into possibly several subgenerators. We discuss the uniformity of the -dimensional distribution of the output of these subgenerators over their full period. In order to improve this uniformity for higher dimensions, we propose a method for finding good parameters in terms of the spectral test. Our results are stated in a general context and are applied to a related complementary multiply-with-carry family of generators.
25.
26.
The synthesis of three aza-analogues of benzothiazole derivatives possessing calcium antagonistic properties has been achieved. 相似文献
27.
David Dumoulin Stéphane Lebrun Axel Couture Eric Deniau Pierre Grandclaudon 《Tetrahedron: Asymmetry》2010,21(2):195-201
A new and flexible route for the asymmetric synthesis of a variety of alkylated bridged tetrahydro-2-benzazepines has been developed. The key steps are the highly diastereoselective Michael addition of metalated SAMP-hydrazones to α,β-unsaturated esters combined with cyclomethylenation/Mitsunobu coupling reactions to secure the formation of the seven-membered azaheterocycle and of the bridged unit, respectively. 相似文献
28.
29.
30.
G. Couture M. Frank H. König M. Pospelov 《The European Physical Journal C - Particles and Fields》1999,7(1):135-139
We calculate the dipole amplitude for the decay and related processes in the left-right supersymmetric model when parity breaking occurs at a considerably large scale. The
low-energy flavor violation in the model originates either from the nonvanishing remnants of the left-right symmetry in the
slepton mass matrix or from the direct flavor changing lepton-slepton-neutralino interaction. The result is found to be large
and already accessible with current experimental accuracy for supersymmetric masses not far above the electroweak scale. It
also provides nontrivial constraints on the lepton mixing in the model.
Received: 8 June 1998 / Published online: 15 October 1998 相似文献