共查询到19条相似文献,搜索用时 453 毫秒
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建成了兰州重离子加速器国家实验室320KV—ECR离子源表面物理实验终端,阐述了该实验终端的关键技术参数,描述了即将开展的高电荷态离子与表面相互作用的物理研究工作及其研究意义. 相似文献
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原子、分子是物质结构的第一个微观层次,是通向下两个微观层次———原子核和粒子的大门.原子分子物理在宇宙物质和过程的研究中起到基础理论的重要作用,而宇宙物质和过程的前沿研究则向原子分子物理提供了许多新的生长点.天体中有无止境的原子分子物理问题有待于人们探讨与研究 相似文献
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以"物理演示实验"为主题和关键词,检索并收集CNKI中2007-2017年的相关文献,应用Citespace对其研究作者、研究机构、研究热点进行图谱绘制及分析,揭示物理演示实验研究发展演进过程.分析结果表明:发表论文总数较少,研究多建立在"学缘"基础上,高校为目前物理演示实验研究的核心机构团队,频次和中心性排名前20的关键词集中在物理演示实验教学领域,但较为笼统.建议增加物理演示实验的研究,增强校际合作,增加中学生和中学教师走进大学物理演示实验基地;微观与宏观相结合,结合时代背景和技术条件创新与整合教学模式、教学设计及课堂教学. 相似文献
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王淦昌的"中微子探测建议"与诺贝尔奖擦肩而过 总被引:1,自引:0,他引:1
“关于探测中微子的建议”是王淦昌一生最重要科研成果之一.这篇原创性论文产生的物理背景、主要思想和它的巨大影响均得到了扼要的阐述,明确指出王淦昌与诺贝尔奖擦肩而过. 相似文献
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物理教学中为演示静电的力效应,通常设计静电滚筒或富兰克林电动机实验.这些实验巧妙地演示带电粒子流冲击滚筒而产生的力矩作用,它将人眼观察不到的微观电荷定向运动与宏观物体的转动有机结合起来,加强了学生对电荷作用力的现象观察与深入思考. 相似文献
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由我国著名物理学家于敏院士主持的国家自然科学基金委员会重大项目“电子与离子、原子、分子微观相互作用过程的实验和理论研究”自1989年7月开始,1992年初经过子课题调整,至1994年底结束.这是国家基金委员会支持的原子分子物理学科的第一个重大项目.众所周知,我国原子分子物理基础薄弱,而学科的发展与当前高科技发展对原子分子物理数据的迫切需求,都要求它有一个较快的发展.经过国内专家反复论证和有关研究单位的协调,决定选择这个项目,并由基金委员会组织专家评审,于“七五”计划期间立项.立项选择电子与离子、… 相似文献
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Glennys R. Farrar 《International Journal of Theoretical Physics》2003,42(6):1211-1218
Particle physics arguments suggest that the H-dibaryon—a state consisting of two u, two d, and two s quarks—may have a mass 1.5 ± 0.2 MeV, and that r
H
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N. Remarkably, the observed stability of nuclei and other experimental limits do not exclude this scenario at present, as discussed here. If they are present in sufficient abundance, relic H's would be the cold dark matter. Tests of this scenario are discussed. 相似文献
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In this study, we deal with the holographic model of interacting dark components of dark energy and dark matter quadratic case of the equation of state parameter(Eo S). The effective equations of states for the interacting holographic energy density are derived and the results are analyzed and compared with the solution of the linear form in the literature.The result of our work shows that the value of interaction term between dark components affects the fixed points at far future in the DE-dominated universe in the case of quadratic Eo S parameter; it is a different result from the linear case in the theoretical results in the literature, and as the Quintom scenario the equations of state had coincidence at the cosmological constant boundary of -1 from above to below. 相似文献
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本文基于其中一种暗物质模型对通古斯大爆炸给出了较详细的新解释,认为通古斯火爆炸是由可成团暗物质形成的暗天体飞临地球造成的。 相似文献
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Using recently observed data:the Constitution dataset of type supernovae Ia (SNIa),the observational Hubble data (OHD),the measurement results of baryon acoustic oscillation (BAO) from the Sloan Digital Sky Survey (SDSS) and the Two Degree Field Galaxy Redshift Survey (2dFGRS),and the current cosmic microwave background (CMB) data from the five-year Wilkinson Microwave Anisotropy Probe (WMAP),we apply the Markov Chain Monte Carlo method to investigate the observational constraints on the generalized Chaplygin gas (GCG) model as the unification of dark matter and dark energy.For this unified model,the constraints on GCG mixture are discussed by considering the different expressions of current matter density or considering constraints as being independent of the matter quantity Ωm. 相似文献
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A valuable consideration is inserted into car-following theory to investigate the difference of drivers' anticipation. Furthermore, a fresh macro traffic model involving the difference of the drivers' anticipation is deduced from the car-following model by applying transformation relationship from micro to macro variables. And this effect resulted from the difference of the drivers' anticipation is observed via numerical simulation. The results show that the difference of drivers' anticipation has a negligible impact on traffic flow. 相似文献
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评述了天体物理中暗物质的发现以及标准模型所面临的问题,综述了解决这些问题及标准模型之外可能出现的新物理与暗物质的联系。介绍了暗物质粒子选择条件和可能的暗物质粒子的候选者;对圆柱形暗物质表面密度与星系和星系团暗物质晕的晕核半径的关系进行了讨论,与其他模型进行了比较,得出暗物质晕的特征半径r*的暗物质表面密度分布不是一个普适量;并叙述了近几年暗物质研究中提出的新理论模型-Hidden dark matter,最后叙述了中国暗物质实验探测研究的进展,2016年底DAMPE的第一批数据有可能给出;中国锦屏地下实验室(CJPL)的CDEX和PandaX合作组的第一期实验没有发现暗物质粒子存在的信号,期待他们下期的实验。A review of the evidence of the dark matter found in universe and the problems faced by the standard model. To address these issues as well as the possible relationship between the new physics beyond the standard model and dark matter, and given the selection condition of dark matter and possible candidates of the weakly-interacting massive particles (WIMPs). The correlation between the column surface density and the halo core radius of the dark matter halos of galaxies and cluster of galaxies is discussed, and the other models are compared. We find that the surface density within the halo characteristic radius r* is not an universal quantity; The new model (hidden dark matter)proposed in the study of dark matter is described. At last, the research progress of dark matter experiment in China is commented. At the end of 2016, the first batch of DAMPE data may be given;No significant excess events of WIMPS were found in the first stage of both the CDEX and PandaX experiments located in the China Jinping Underground Laboratory(CJPL). Look forward to their the next stage of these experiments in CJPL. 相似文献
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G. Lessner 《General Relativity and Gravitation》2001,33(5):757-765
It is shown that a negative cosmological constant –10–56 cm–2 can completely replace cold dark matter in galaxy clusters. The consequences of such a constant are discussed. 相似文献