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关于塞曼效应实验的讨论
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作者 杨昕卉 《牡丹江师范学院学报(自然科学版)》 2001年第4期31-32,共2页
讨论了正常塞曼效应的横效应和纵效应产生不同现象的原因以及在外磁场作用下任意方向的分谱线的偏振状态和强度。
关键词 塞曼效应 偏振状态 强度 现代物理实验 效应 纵效应 分谱线
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任意方向塞曼效应的实验研究
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作者 刘凌波 《沈阳教育学院学报》 1999年第1期123-124,共2页
通过实验观察证实在一般方向上塞曼效应谱线的σ的成份为椭圆偏振。
关键词 塞曼效应 椭圆偏振 原子物理学 物理教学 效应 纵效应 磁场
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Investigation of Mode and Modulation Responses in Semiconductor PS-DFB Lasers:Use of a Vector-Newton Method
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作者 张冶金 朱林 +5 位作者 高志国 陈明华 董毅 陈维友 刘式墉 谢世钟 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2002年第9期935-940,共6页
A numerical model for steady state analysis and analytical expressions for the AM and FM modulation responses of DFB lasers are presented.The small signal modulation responses of 3 phase shift(PS) DFB is investigate... A numerical model for steady state analysis and analytical expressions for the AM and FM modulation responses of DFB lasers are presented.The small signal modulation responses of 3 phase shift(PS) DFB is investigated for the first time.A new method(Vector Newton method) to obtain multiple longitudinal mode of DFB lasers is used.It is demonstrated that this method is suitable for obtaining multiple solution of high nonlinear equations.Longitudinal photon density distribution and multiple longitudinal mode of 3PS DFB and simple DFB lasers are analyzed.The results show that modulation response characteristics of 3PS DFB laser is as good as that of DFB,and PS can weaken the longitudinal spatial hole burning (LHSB) effect and is in favor of single longitudinal mode operating of lasers. 展开更多
关键词 phase shift DFB VECTOR single mode LHSB modulation response
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LONGITUDINAL DISCH.CO_2 LASER WITH PULSED PRE-IONIZATION
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作者 Yu Yanning Wan Chongyi(institute of electronics, Chinese Academy of Sciences, Beijing 100080) 《Journal of Electronics(China)》 2002年第2期220-224,共5页
A novel pre-ionization scheme of helical transverse-pulsed pre-ionization in a longitudinal discharge CO2 laser is presented. The laser tube is made of glass with inner diameter of 7.5mm and discharge length of 50cm. ... A novel pre-ionization scheme of helical transverse-pulsed pre-ionization in a longitudinal discharge CO2 laser is presented. The laser tube is made of glass with inner diameter of 7.5mm and discharge length of 50cm. The laser performance characteristics as functions of parameters, such as pressure, charging capacitance and applied voltage, are investigated. Compared with the same laser structure without pre-ionization, the maximum pulse energy improves by 23%, the optimum electro-optical efficiency increases by 31%, and the specific output energy reaches 26 J/(L·atm). 展开更多
关键词 Pre-ionization HELICAL Longitudinal discharge Electro-optical efficiency
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Nonlinear dynamics and coupling effect of libration and vibration of tethered space robot in deorbiting process
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作者 王班 郭吉丰 +1 位作者 冯吉根 王剑 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第5期1095-1105,共11页
In order to control the growth of space debris,a novel tethered space robot(TSR) was put forward.After capture,the platform,tether,and target constituted a tethered combination system.General nonlinear dynamics of the... In order to control the growth of space debris,a novel tethered space robot(TSR) was put forward.After capture,the platform,tether,and target constituted a tethered combination system.General nonlinear dynamics of the tethered combination system in the post-capture phase was established with the consideration of the attitudes of two spacecrafts and the quadratic nonlinear elasticity of the tether.The motion law of the tethered combination in the deorbiting process with different disturbances was simulated and discussed on the premise that the platform was only controlled by a constant thrust force.It is known that the four motion freedoms of the tethered combination are coupled with each other in the deorbiting process from the simulation results.A noticeable phenomenon is that the tether longitudinal vibration does not decay to vanish even under the large tether damping with initial attitude disturbances due to the coupling effect.The approximate analytical solutions of the dynamics for a simplified model are obtained through the perturbation method.The condition of the inter resonance phenomenon is the frequency ratio λ_1=2.The case study shows good accordance between the analytical solutions and numerical results,indicating the effectiveness and correctness of approximate analytical solutions. 展开更多
关键词 tethered space robot general nonlinear dynamics deorbiting process perturbation method inter resonance phenomenon
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Human Body Surface Oscillations Remote Measurements by Means of Laser Doppler Interferometer
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作者 Larisa A. Glushchenko Fedor A. Zapryagaev +1 位作者 Vladimir S. Makin Vadim Ya. Krokhalev 《Journal of Mathematics and System Science》 2012年第7期404-408,共5页
Experimental results of remote laser measurement of a time structure of a pulse waves are resulted. Occurrence of the pulse waves are connected with the rhythmic reduction of a myocardittm. Speed of pulse wave's prop... Experimental results of remote laser measurement of a time structure of a pulse waves are resulted. Occurrence of the pulse waves are connected with the rhythmic reduction of a myocardittm. Speed of pulse wave's propagation does not depend on speed of current of blood, it is defined by diameter of a vessel, by its walls thickness, by elasticity of a vessel, and also by rheological properties of blood. Measurement of parameters of pulse waves is important tbr definition of a condition of cardiovascular system. Ways of measurement of characteristics of pulse waves used now (acoustic, electric, optical) are contact. In some cases, for example, in clinics on treatment of burns and so forth, the question of remote measurement of processes hemodynamics by use of methods of laser sotmding is rather actual. The results described in work have shown outlook of development of laser methods of diagnostics for present purposes. The measurement technique used by authors is based on use of longitudinal Doppler effect which essence consists in change of frequency or length of a wave of radiation at reflection from moving surface. For smoothing the measured signal (clearing from noise) the program developed by authors on the basis of the wavelet-analysis was used. Experimental measurements are shown, that the laser method allows to register distinctly structure of pulse waves which is characterized by two peaks. The results of remote laser measurement of a time structure of a pulse waves confirm the assumption made on the basis of general-theoretical physical positions, that characteristics of pulse waves can be registered on the Doppler effect basis. 展开更多
关键词 Pulse wave Doppler effect laser remote methods.
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Checking for normality in linear mixed models 被引量:1
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作者 WU Ping 1,,ZHU LiXing 2,3 & FANG Yun 4 1 School of Finance and Statistics,East China Normal University,Shanghai 200241,China 2 School of Statistics and Mathematics,Yunnan University of Finance and Economics,Yunnan 650221,China +1 位作者 3 The Department of Mathematics,Hong Kong Baptist University,Hong Kong 999077,China 4 Mathematics and Science College,Shanghai Normal University,Shanghai 200234,China 《Science China Mathematics》 SCIE 2012年第4期787-804,共18页
Linear mixed models are popularly used to fit continuous longitudinal data, and the random effects are commonly assumed to have normal distribution. However, this assumption needs to be tested so that further analysis... Linear mixed models are popularly used to fit continuous longitudinal data, and the random effects are commonly assumed to have normal distribution. However, this assumption needs to be tested so that further analysis can be proceeded well. In this paper, we consider the Baringhaus-Henze-Epps-Pulley (BHEP) tests, which are based on an empirical characteristic function. Differing from their case, we consider the normality checking for the random effects which are unobservable and the test should be based on their predictors. The test is consistent against global alternatives, and is sensitive to the local alternatives converging to the null at a certain rate arbitrarily close to 1/V~ where n is sample size. ^-hlrthermore, to overcome the problem that the limiting null distribution of the test is not tractable, we suggest a new method: use a conditional Monte Carlo test (CMCT) to approximate the null distribution, and then to simulate p-values. The test is compared with existing methods, the power is examined, and several examples are applied to illustrate the usefulness of our test in the analysis of longitudinal data. 展开更多
关键词 linear mixed models estimated best linear unbiased predictors BHEP tests conditional MonteCarlo test
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