排序方式: 共有19条查询结果,搜索用时 218 毫秒
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英国实验物理学家阿斯顿因发明质谱仪分离同位素而获得1922年诺贝尔化学奖.他只拥有学士学位,这在诺贝尔奖的获得者中是不多见的.他是怎样取得成功的,又为何能取得成功?是值得我们去探究的.文章着重介绍了阿斯顿的研究历程,并分析其成功经验,以为今天所倡导的创新研究提供借鉴. 相似文献
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首先对全国部分地区大学生物理竞赛中热学试题所占的比例进行统计,然后分析热学试题中各知识点的分布情况,最后就几个典型的热学试题进行剖析。 相似文献
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根据数列的极限及级数的收敛的定义和准则,详尽地分析了两个具体的物理问题的极限存在性(即物理解的存在性),据此便捷地求解了这两个问题,体现了数列极限思想在物理问题中的重要性. 相似文献
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In this paper, the J/ψ nuclear absorption effect is studied at RHIC and LHC energies with the EKS98 shadowing parameterizations. By assuming that the J/ψ absorption cross section, σ abs , increases with the charmonium-nucleon (J/ψ-N) center of mass energy, s J/ψN , it is found that σ abs should depend on x F (or y) at a certain center of mass energy per nucleon pair,s , especially at LHC energies. The theoretical results with the x F (or y)-dependence of the absorption effect are in good agreement with the experiment data from PHENIX in d-Au collisions and the predicted results will be examined by the forthcoming experimental data from LHC in d-Pb collisions. Finally, we also present baseline calculations of cold nuclear matter effects on J/ψ production in nucleus-nucleus (A-A) collisions and find that the x F (or y)-dependence of absorption effect is very small at both RHIC and LHC energies in A-A collisions. 相似文献
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