物理演示实验六大教学原则

根据物理演示实验教学的特点和要求, 创建物理演示实验六大教学原则: 科学性物理演示实验教学原 则、 成功性物理演示实验教学原则、 直观性物理演示实验教学原则、 配合性物理演示实验教学原则、 示范性物理演 示实验教学原则、 安全性物理演示实验教学原则     

分光计上物理实验分级设计与教学实践

介绍了中国科学技术大学物理实验教学中心近几年在分光计实验教学方面实施的分级实验教学设计及教学实践情况,具体包括分光计基础实验教学和扩展实验教学课程设计思路、教学重点、扩展实验课程内容简介及教学反馈情况.     

基于校园网的开放式物理实验教学及管理模式的研究与应用

在进行物理实验教学体系改革的基础上,研究基于校园网的开放式物理实验教学及管理模式,探索地方工科院校的物理实验教学改革模式并在实验教学中应用。     

普通物理实验教学改革的探索与研究

论述了普通物理实验教学改革主要从实验教学内容和课程体系、实验教学方法、实验教 学手段及实验教学考核等方面进行改革。     

有限开放性大学物理实验教学模式的探讨

随着传统实验教学模式固有弊端的凸显,因材施教、分层教学的开放性实验教学模式已成为实验教学的发展方向．然而由于开放性实验教学改革所面临的困难短期内无法克服,更多地停留在口号层面上,而无实质性进展．本文在开放性实验教学思想的指导下,采用开放式实验教学与传统实验教学相结合的方法探索了一条更符合认知规律且与实际相适应的有限开放性实验教学方式,给出了部分供同行参考的设计性、研究性实验题目．首次提出了“开放度”的概念,并建议将实验教学的开放度作为重要指标列入高校教学水平评估和实验室评估的评估体系．     

浅议实验教学竞赛对提高实验教学质量的作用

通过参与实验教学竞赛,分析了实验教学竞赛对实验室建设、实验课教师和实验技术人员的业务水平提高、对实验教学改革的积极推动作用,探讨了提高实验教学质量的途径。     

大学物理实验教学改革的探讨

分析了物理实验教学的现状及存在的弊端,总结实验教学经验,改革实验教学,切实提高教与学的质量,充分发挥实验教学在培养学生"知识、能力、素质"中的作用.     

"核物理综合实验"虚拟仿真实验项目的建设

主要对"核物理综合实验"虚拟仿真实验项目的建设过程进行了总结和探讨。针对高校核物理实验教学活动中无法保存放射源造成课程内容缺失,东北大学物理实验教学中心开发了"核物理综合实验",该实验项目开创了VR开放式核物理虚拟仿真实验教学的新模式,优化和发展核物理综合实验教学,突出学生在实验教学活动中的主体性,培养学生的创新能力和科学素养,该教学模式正用于实验教学,并已经获评国家级虚拟仿真实验教学项目。     

独立院校大学物理实验教学模式改革初探

本文结合河海大学文天学院大学物理实验教学的实际,分析了独立学院大学物理实验教学存在的问题,从实验教学内容、实验教学方法以及实验考核机制等方面进行探讨,并提出一些改进措施。     

核物理虚拟仿真实验教学平台搭建——基于开放式实验教学

针对高校核物理实验教学活动中辐射安全隐患造成课程开展不便,实验教学改革在本科人才培养中的切合等问题,重庆大学物理实验中心利用开放式实验教学网络管理系统,采用虚实结合的方式,开辟开放式核物理虚拟仿真实验教学的新模式,优化和发展核物理实验教学,突出学生在实验教学活动中的主体性,培养学生的创新能力和科学素养,该教学模式正用于试验教学,并已取得初步成效。     

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.     

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.     

Fiber Modal Index Measurements Based on Fiber Gratings

A novel method based on fiber gratings for measuring the effective indices of fiber modes is proposed. The effective index difference between the core mode and a cladding mode was obtained by analyzing the interference fringe of a pair of cascaded long-period fiber gratings. In order to extract the core mode index from the measured index difference, an index matching oil immersion method is proposed. By analyzing the interaction between the cladding mode and the oil applied on the cladding surface, the mode order and the effective index of the involved cladding mode might be calculated. Experimental results about the interference fringe shifts induced by the oil index and the oil-applied length are also presented.     

Optical Pulse Compression Schemes That Use Nonlinear Bragg Gratings

Nonlinear optical pulse compression of picosecond pulses typically requires long lengths of optical fiber and multiple components. Periodic structures, such as fiber Bragg gratings, are highly dispersive at wavelengths outside of the photonic bandgap. This implies that such gratings can be used as very short all-fiber compressors. In this paper a number of such compression schemes are reviewed involving uniform and nonuniform fiber Bragg gratings, relying on both soliton and nonsoliton compression principles. Experimental results supporting the corresponding underlying theory are also presented. Finally, an extension of one of the compression schemes is shown, which allows the generation of adjustable high-repetition rate soliton trains.