共查询到20条相似文献,搜索用时 125 毫秒
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物理是以实验为基础的自然科学,所谓物理,就是通过"物"--物理实验引入物理概念,研究物理规律.就是要以"物"喻出"理"的本质,以"物"明了"理"的内涵,以"物"揭示"理"的真谛.因此,物理实验是学生获取知识、进行知识创新的重要手段,是培养学生的学习兴趣、科学态度和提高学生终身学习能力的重要途径. 相似文献
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关于"光的本性",在物理学的发展历史中曾经历过"微粒说"和"波动说"的激烈争论.以牛顿为代表的"微粒说"理论认为:光是微粒;而以惠更斯为代表的"波动说"理论则认为:光是波.在1801年托马斯·杨完成"光的双缝干涉"实验挽救了光的"波动说"理论的颓势之前,在关于"光的本性"的激烈争论中,"微粒说"理论略占上风. 相似文献
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科学的本质是近年来世界范围内科学教育改革所关注的热点问题之一.理解科学的本质,实际上要回答"科学是什么"、"科学不是什么"、"科学能做什么"和"科学不能做什么"等问题.物理学作为自然科学的基础学科、主导学科和重要学科,充分体现了科学的本质特征.物理教学应加强科学本质的教育,使学生加深对科学本质的认识和理解. 相似文献
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The principle and experimental results of the open microwave resonant cavity measurement system were introduced. The models were steel ball models and the ball models coated with copper. The diameter of the models was 10mm . The models were launched in ballistic range. The model velocity was 5.44 km .s-1. The wake electron density of the models was obtained. The experimental results presents that the response time of the open microwave resonant cavity measurement system was quicker than 1ms. The results showed the wake electron density ranged from 109cm -3 to 1011cm -3 could be achieved. 相似文献
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Within the framework of the Glauber Theory, we divide the many-particle system into two subsystems, formed by the "Valence" particles and the "Sea" particles respectively. Then the multiple scattering amplitudes can also be divided into "sea" - "sea", "sea" - "valence","valence" - "sea", and "valence"- "valence" multiple scattering amplitudes. For the calculation of these different amplitudes, different effective approximate methods are proposed.Finally, the S matrix for the "sea" - "sea ", "sea" - "valence";"valence" - "sea" and "valence" - "valence" processes is, obtained which is physically clear and convenient in calculation. 相似文献
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We consider bistable systems driven by stationary wideband Gaussian colored noise. We construct uniform asymptotic expansions of the stationary probability density function and of the activation rate, for small intensity and short correlation time of the noise. We find that for different values of the total power output / of the noise, different terms in the asymptotic expansions become dominant. For we recover previously derived results, while for =O() and new results are obtained. 相似文献
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用SURFMN和SURFMN_TFCOIL代码计算了由HL-2M 装置磁场线圈安装误差产生的误差场。根据国外托克马克装置TF和PF线圈安装误差的取值范围,以及HL-2A 装置安装的经验,计算选取的TF线圈和PF线圈最大位移范围为3~8mm ,最大倾斜角度为0.05~0.1°。选取9组数据计算了误差场的概率密度分布和累计概率分布。结果发现:在TF和PF线圈安装误差取值范围内,随磁场线圈最大移位增大概率密度显著变平,误差场B3-mode/BT的分布范围显著增大;磁场线圈的位移比倾斜对误差场的影响更大;当磁场线圈最大位移达到5mm 时误差场大于2×10-4的概率都比较大,特别是线圈最大位移等于8mm 时,误差场大于2×10-4的概率在60%以上。 相似文献
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P. VingerhoetsK.T. Flanagan J. BillowesM.L. Bissell K. BlaumB. Cheal M. De RydtD.H. Forest Ch. GeppertM. Honma M. KowalskaJ. Krämer K. KreimA. Krieger R. NeugartG. Neyens W. Nörtershäuser J. PapugaT.J. Procter M.M. RajabaliR. Sánchez H.H. StrokeD.T. Yordanov 《Physics letters. [Part B]》2011,703(1):34-39
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A. C. Biswas 《Journal of statistical physics》1972,5(3):173-183
Utilizing the facts (i) that the number of particles in the many-boson system is conserved and (ii) that the Hamiltonian is Hermitian, a new set of variables comprising action and angle variables has been introduced. These variables are conjugate in the mean and provide a rigorous approach to introducing phase variables for total-number-conserving many-boson systems.Lecture given at the Saha Institute of Nuclear Physics, Calcutta, June 1971. 相似文献
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We demonstrate with the example of Cahn-Hilliard dynamics that the macroscopic kinetics of first-order phase transitions exhibits an infinite number of constants of motion. Moreover, this result holds in any space dimension for a broad class of nonequilibrium processes whose macroscopic behavior is governed by equations of the form /t = W(), where is an order parameter,W is an arbitrary function of , and is a linear Hermitian operator. We speculate on the implications of this result. 相似文献