235,238U核数据的快中子基准实验积分检验

用四个快中子基准实验检验了ＥＮＤＦ／Ｂ－ＶＩ、ＪＥＮＤＬ－３和ＣＥＮＤＬ－２三个评价核数据库中的２３５Ｕ和２３８Ｕ等数据．计算结果指出，ＥＮＤＦ／Ｂ－ＶＩ库的数据对快中子积分实验的预言更准确． Four fast benchmark experiments have been used to the data of 235,238U in testEndf/B-VI,JENDL-3 and CENDL-2 nuclear date libraries...     

用光纤做Fabry-Perrot实验

介绍用光纤做Ｆ－Ｐ实验的方法，拍摄了干涉环，测量出Ｆ－Ｐ干涉仪两平行玻璃板间的距离，实验光路简单，光涉条纹清晰，测量结果可靠。     

J95型He—Ne激光实验装置的研制和实验

一、研制J95型He－Ne激光实验装置的基本思想和装置的特点激光实验中以He－Ne激光实验最为直接，最为简单，最为明了，能直观地了解激光是如何产生的，以及影响激光输出功率的种种因素．但在以往的一些He－Ne激光实验装置中，全套均是玻璃结构，因而存在许多难以克服的缺点，给教学带来诸多不便．例如：1．全套实验装置都是玻璃结构，组装十分复杂，必须有相当技术的玻璃工才能完成，而且一旦装成便不易挪动．2．激光实验装置工作一段时间后，需更换高纯He和Ne气、电离管、热偶管等重要部件，高真空阀门也时有损坏，但在玻璃结构的装置…     

数字仪表的设计实验

本介绍一个综合性、设计性研究实验－数字仪表的设计。实验具有探索性和延展性，有助于培养学生的研究能力和创新能力。     

共振实验的改进

用永磁体作为磁极工替电磁线圈产生阻尼，用录音电机并配以ＬＡ５５１１调速稳速集成电路代替直接传动电机作为策动力源，对原ＣＺＹ－３型共振仪作了改进，实验效果更好。     

中性原子干涉实验

中性原子干涉实验干涉实验是古老的实验，最早的干涉是可见光干涉，演示了光的波动性。最早的物质粒子干涉是电子干涉。著名的电子双缝干涉演示了物质粒子的波动性，为量子力学建立奠定了基础。１９５９年Ａｈａｒｏｎｏｖ－Ｂｏｈｍ提出了ＡＢ效应的理论，１９６０年Ｃｈ...     

油滴实验的数据处理方法

提出一种用于密立根油滴实验数据处理的新方法－“图解法”。用这种方法进行数据处理，不需要事先知道单位电荷数值，克服了“最大公约数方法”中寻求最大公约数的困难。“图解法”根据公式ｑ＝ｎｅ，将ｅ视为直线方程的斜率，通过拟合直线，一次性求得所有油滴的带电量子数和单位电荷值，具有合理、直观和简捷的优点。     

“全息照相”实验原理

本文以工科物理中波动光学的基本内容－干涉和衍射为基础，较为通俗地介绍了全息照相的物理思想。     

托卡马克LHCD实验中的电子加热

LHCD实验是托卡马克途径为实现稳态运行而进行的重要科研项目。我国的两个主要托卡马克实验装置HL－1M和HT－7已进行多年研究，在建的两大装置HL－2A和HT－7U也将在更高波功率下进行LHCD研究。虽然LHCD实验的主要目的是驱动电流，但波功率平衡问题是一个非常重要的物理问题，因为波功率最终不是被电子或离子吸收，这是通过某种机制损失了。     

激光预警与电视跟踪演示实验装置

介绍了一种激光预警与电视跟踪演示实验装置,较详细地叙述了其主要部分－－PIN报警、CCD成像型激光报警和电视跟踪的原理及电路设计,为激光制导武器与对抗和电视制导等课程提供了真实形象的演示效果。     

Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide

Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs.     

Effect ofγ-radiation on the spectral luminescence characteristics of impure cadmium tungstate crystals

Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation (5.5·10⁴ Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure crystals is analyzed (preliminarily). Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997.     

Femtosecond Transform-Limited Pulse Generation by Compensating for the Linear Chirp of SPM Spectra in Dispersion Shifted Fibers

A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output.     

Sorting of bending magnets for the SSRF booster

The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper.     

Measurement of nonlinear coefficient of optical fiber based on small chirped soliton transmission

We measure the waveform and phase curves of short optical pulses before and after transmission over different lengths of fibers by use of the pulse analyzer with the frequency-resolved optical gating (FROG),and numerically simulate pulse evolution under the experimental conditions.The nonlinear coefficient of the fiber is given by comparing the experimental results with the numerical ones.Difference between the experiment and numerical simulation is analyzed.     

Resonance scattering of canonical elastic shells in absorbing fluid medium

Resonance scattering of elastic spherical shell and cylindrical shell while the surrounding fluid medium has absorption is studied. The normal mode solution derived using exact elastic theory and the separation of variables is still applicable. However, the scattering form function has to be modified for the absorbing medium, otherwise the unreasonable result would be obtained. The backscattering form function in the absorbing medium is redefined, and the form function of elastic spherical and cylindrical shell with vacuum or solid matter filled is calculated in various absorption conditions. The results show that the absorption of surrounding fluid leads to notable attenuation of the coincidence resonances in the mid-frequency, but it has a little influence on the low-frequency resonance scattering induced by the filler inside the shell.     

Single-beam self-referenced phase-sensitive surface plasmon resonance sensor with high detection resolution

A versatile and low-cost single-beam self-referenced phase-sensitive surface plasmon resonance(SPR)sensing system with ultra-high resolution performance is presented.The system exhibits a root-mean-square phase fluctuation of ±0.0028.over a period of 45 min.i.e.a resolution of±5.2×10-9 refractive index units.The enhanced performance has been achieved through the incorporation of three design elements:a true single-beam configuration enabling complete self-referencing so that only the phase change associated with SPR gets detected,a differential measurement scheme to eliminate spurious signals not related to the sensor response,and the elimination of retardation drifts by incorporating temperature stabilization in the liquid crystal phase modulato .Our design should bring the detection sensitivity of non-labeling SPR biosensing closer to that achievable by conventional fluorescence-based techniques.     

Influences of SiO2 protective layers and annealing on the laser-induced damage threshold of Ta2O5 films

Ta2O5 films are prepared on BK7 substrates with conventional electron beam evaporation deposition.The effects of SiO2 protective layers and annealing on the laser-induced damage threshold (LIDT) of the films are investigated.The results show that SiO2 protective layers exert little influence on the electric field intensity(EFI)distribution,microstructure and microdefect density but increase the absorption slightly.Annealing iS effective on decreasing the microdefect density and the absorption of the films.Both SiO2 protective layers and annealing are beneficial to the damage resistance of the films and the latter is more effective to improve the LIDT.Moreover,the maximal LIDT of Ta2O5 films is achieved by the combination of SiO2 protective layers and annealing.     

A stereo matching algorithm using multi-peak candidate matches and geometric constraints

Gray cross correlation matching technique is adopted to extract candidate matches with gray cross correla- tion coefficients less than some certain range of maximal correlation coefficient called multi-peak candidate matches. Multi-peak candidates are extracted corresponding to three closest feature points at first. The corresponding multi-peak candidate matches are used to construct the model polygon. Correspondence is determined based on the local geometric relations between the three feature points and the multi-peak candidates. The disparity test and the global consistency checkout are applied to eliminate the remaining ambiguous matches that are not removed by the local geometric relational test. Experimental results show that the proposed algorithm is feasible and accurate.