共查询到20条相似文献,搜索用时 78 毫秒
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今年的"三·八"国际妇女节,<物理>杂志编辑部向我约稿,这使我作为一名女性科研人员,比男士们多了一个机会,可以说说自己想说的话. 相似文献
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周光召先生是我敬重的师长.上世纪50年代,周先生研究生刚毕业留北京大学任教不久,就成为我和其他4位同学的本科毕业论文导师.在他的指导下,我们研究了在轧钢过程中钢材内热应力的分布,他带领我们一起深入分析每一阶段的计算结果,通过这项研究,我们学会了微分方程的数值解法,锻炼了分析问题的能力,这在我毕业后的研究工作中起了积极作用. 相似文献
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我是在1952年来到南京大学物理系的。建国初期,新中国遭到西方资本主义世界的敌视和全面封锁,只得向苏联学习,进行了全国高等院校的院系大调整。就是在此形势下,我从浙江大学调到了南京大学。浙江大学的理学院被调整掉了,成为工科性大学。实际上浙江大学的理学院在国内学术上有一定地位,所以对这次调整,浙江大学很有意见,但也没有办法。我到了南京大学物理系后参加了多次会议,?... 相似文献
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1930年,赵忠尧实验观察到正电子湮没释放的辐射,测得一种能量约等于电子质量的特殊辐射。当年,这是精密的核物理实验。赵忠尧是正电子湮没现象的发现者,对正电子发现有重要贡献。两年后,安德逊(Anderson)在云雾室中观察到正电子的行迹,从狄拉克(Dirac)预言正电子至此约4年时间,人们确认第一个反粒子的存在,开启了粒子物理的时代。之后,结合加速器的进步及多个基本粒子的发现,走上高能物理发展的开阔行程。 相似文献
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中国科学院高能物理研究所是我国从事高能物理研究、先进加速器物理与技术研究及开发利用、先进射线技术与应用的综合性研究基地。其前身是创建于1950年的中国科学院近代物理研究所,后改称物理研究所、原子能研究所。1973年2月,在原子能研究所一部的基础上组建高能所。 相似文献
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Competition within the immune system may degrade immune control of viral infections. We formalize the evolution that occurs in both HIV-1 and the immune system quasispecies. Inclusion of competition in the immune system leads to a novel balance between the immune response and HIV-1, in which the eventual outcome is HIV-1 escape rather than control. The analytical model reproduces the three stages of HIV-1 infection. We propose a vaccine regimen that may be able to reduce competition between T cells, potentially eliminating the third stage of HIV-1. 相似文献
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Summary Annual and seasonal rainfall data taken in the period 1951–1986 have been spatially averaged over the region Friuli-Venezia
Giulia and analysed with the aim of searching for the presence of trends. The results of the two rank tests recommended by
the World Meteorological Organization (WMO) support the hypothesis of a decreasing trend in the autumn rainfall and, with
less probability, an increasing trend in spring. 相似文献
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Contribution From the Breakup-Fusion Mechanism to the Contin uum Spectra (Part I of Continuum Spectra Research) 下载免费PDF全文
LI Xian-Hui 《中国物理C(英文版)》1992,16(2):145-150
Contribution from the breakup-fusion mechanism to continuum spectra of nuclear reaction is introduced.In this mechanism a two-step process is considered in which the projectile breaks up to two pieces in the field of target,and fusion of one piece with the target is followed.A method of finite range calculation is presented.The comparison of theoretical calculation with experimental data is shown for reactions on light and heavy targets bombarded by α-projectile.The results show that the breakup-fusion mechanism mainly contributes to continuum spectra. 相似文献
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《Nuclear Physics A》1997,627(3):391-426
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Jan Rzewuski 《Reports on Mathematical Physics》1975,8(2):255-270
An algebra of generating functionals for sets of symmetric n-point functions is investigated. It contains a twosided ideal of functionals which vanish on mass-shell. Since scattering processes are described by on-mass-shell values of these functionals, it is proposed to formulate the physical conditions of unitarity, relativity and causality (locality) in terms of elements of the algebra of equivalence classes modulo . In Part I the extended form of the unitarity and relativity condition is discussed. An example of the algebra of coherent functionals is considered. The causality condition will be treated in the second part of this paper. 相似文献
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研究性学习是一种指导学生探索事物的真相、性质、规律的学习,它强调教学过程中师生的“积极互动、共同发展”,让学生学会用研究的眼光去看待学习对象.对于物理教学来说,可以从以下4个层面上做好工作. 相似文献
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A new mathematical model of the operation of a laminar-flow diffusion chamber that includes the homogeneous nucleation (condensation) and growth of new-phase particles (droplets) is studied qualitatively. It is shown that numerical simulation must correctly take into account the concentration and temperature dependences of transport coefficients in a vapor-gas mixture. The domains of applicability of the previous mathematical models of a laminar-flow diffusion chamber are found. 相似文献
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A NikitinL.R Brown L FéjardJ.P Champion Vl.G Tyuterev 《Journal of Molecular Spectroscopy》2002,216(2):225-251
As part of the simultaneous analysis of line positions and intensities of the first two polyads of monodeuterated methane, the results achieved for the region 3-5 μm are reported. It involves the three highest fundamentals, (ν1, ν2, ν4), overlapped by overtone (2ν3, 2ν5, 2ν6) and combination (ν3+ν6, ν3+ν5, ν5+ν6) bands. The theoretical model was based on the global tensorial model implemented in the MIRS package. Some 10 000 line positions and 2400 line intensities have been modeled to ±0.000 88 cm−1 and ±3.6% respectively, using measurements obtained at 0.0056 and 0.011 cm−1 resolution with the Fourier transform spectrometer at National Solar Observatory located at Kitt Peak. The strongest band in this polyad is ν4(E) at 3016.7 cm−1 with a strength of 6.3×10−18 cm−1/(molecule cm−2) at 296 K; the weakest band is 2ν3(E) at 2597.7 cm−1 with a strength of 1.9×10−20 cm−1/(molecule cm−2) at 296 K. The total calculated absorption arising from the CH3D nonad is 8.95×10−18 cm−1/(molecule cm−2) at 296 K. 相似文献