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The threshold enhancement in the cross section γγ → ?0?0, including the lower energy point reported by the CELLO group, and the observed angular distributions have been interpreted in terms of an isoscalar resonance with JPC = 0++, mass 1450–1550 MeV and width 100–150 MeV. 相似文献
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Joseph Glaz Marco Guerriero Rohini Sen 《Methodology and Computing in Applied Probability》2010,12(4):731-747
Let X
ijk
,1 ≤ i ≤ N
1,1 ≤ j ≤ N
2, 1 ≤ k ≤ N
3 be a sequence of independent and identically distributed 0 − 1 Bernoulli trials. X
ijk
= 1 if an event has occurred at the i,j,k
th
location in a three dimensional rectangular region and X
ijk
= 0, otherwise. For 2 ≤ m
j
≤ N
j
− 1,1 ≤ j ≤ 3, a three dimensional discrete scan statistic is defined as the maximum number of events in any m
1×m
2×m
3 rectangular sub-region in the entire N
1×N
2×N
3 rectangular region. In this article, a product-type approximation and three Poisson approximations are derived for the distribution
of this three dimensional scan statistic. Numerical results are presented to evaluate the accuracy of these approximations
and their use in testing for randomness. 相似文献
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The evolution of texture and microstructure during recrystallization is studied for two-phase copper alloy (Cu–40Zn) with a variation of the initial texture and microstructure (hot rolled and solution treated) as well as the mode of rolling (deformation path: uni-directional rolling and cross rolling). The results of bulk texture have been supported by micro-texture and microstructure studies carried out using electron back scatter diffraction (EBSD). The initial microstructural condition as well as the mode of rolling has been found to alter the recrystallization texture and microstructure. The uni-directionally rolled samples showed a strong Goss and BR {236}?385? component while a weaker texture similar to that of rolling evolved for the cross-rolled samples in the α phase on recrystallization. The recrystallization texture of the β phase was similar to that of the rolling texture with discontinuous ?101? α and {111} γ fiber with high intensity at {111}?101?. For a given microstructure, the cross-rolled samples showed a higher fraction of coincident site lattice Σ3 twin boundaries in the α phase. The higher fraction of Σ3 boundaries is explained on the basis of the higher propensity of growth accidents during annealing of the cross-rolled samples. The present investigation demonstrates that change in strain path, as introduced during cross-rolling, could be a viable tool for grain boundary engineering of low SFE fcc materials. 相似文献