学术研讨式学习方式的构建与实施

本文是子课题“ 基于创新素养培育创新学习方式的探索”研究概要总结. 首先, 揭示现行中学物理创新 教育中存在问题, 提出基于拔尖创新人才培育的学术研讨式学习方式的重要性; 其次, 根据学术研讨的一般性结合 中学物理教学实际, 构建学术研讨式学习方式; 最后, 结合具体物理竞赛教学实例, 运用学术研讨式学习方式实施创 新学习的实践探索     

论物理的分卷式考试

本文根据试验的结果论述了物理的分卷式考试的特点及优越性．着重论述了全部采用选择题的可行性，从而推出一种新的物理考试方法．     

初中物理先学后导式和谐高效教学模式解读

介绍了我校在初中物理教学中实施的"先学后导式和谐高效教学模式".     

转变高中物理学习方式的实践与思考

介绍了研读式、研究式、研讨式、研习式四种学习方式实施的依据、条件、步骤及应该注意的问题和应达到的教学目标以及在教学过程中确保能够具体实施的做法及思考．     

演示实验制作促进动手动脑的大学物理探索式学习的改革尝试

介绍了我们通过制作演示实验装置促进动手动脑的大学物理探索式学习的教学改革实践.详细说明了"动手动脑"学习的试验过程、试验结果.自制物理演示实验装置给学生提供了一个可以自主选题的探索式学习平台.     

基于案例式教学法力学与理论力学 课程关联教学的研究

根据当代教育的发展和理论物理教学中存在的问题, 针对工程人才短缺和本科生培养质量问题, 提出 基于案例式教学法在力学与理论力学课程关联教学的思想, 介绍了案例式教学法的基本内涵, 同时探索了案例式 教学法在力学与理论力学课程关联教学的研究, 为培养国家急需人才提供了理论与实践的保障     

从自组织理论的视角看探究式学习与接受式学习

目前人们对探究式学习与接受式学习在教学中的地位认识仍不清晰，在具体的实践教学中存在不少误区。本文试图运用白组织理论对探究式学习和接受式学习进行辨析，并得出这两种学习方式都是使学生学习知识的有效手段，而它们的区别在于接受式学习强调依靠外力来推动学生的学习，探究式学习则强调依靠学生系统内部的自组织演化机制来促进学生自主的学习。     

熵产生在测量系统的应用

本文利用不可逆热力学的熵理论，分别对发电式和参量式变换器测量系统进行了信息流动分析，并给出了信息传递的匹配条件。     

创客教育理念下初中物理项目式学习的实践研究

从创客教育理念出发，以项目化学习为载体，探索促进学生物理学科核心素养发展的有效途径.阐释了初中物理项目式学习的设计策略和实践成果——“创物”项目、“创案”项目和“创意”项目，并以“我的乐器我做主”为例展示设计和实践的具体细节，从学业成绩和师生反馈来看初具成效.     

基于项目式学习的初中物理复习策略研究——以“自制杆秤”项目为例

项目式学习以学生为学习主体,主张从做中学,充分体现学习的实践性和创造性.在复习课中引入项目式学习,为学生搭建一个实践操作、解决问题、交流合作的平台,有助于学生自主构建知识体系,完成知识的内化和思维的拓展,提升学生的核心素养.以“自制杆秤”项目为例,呈现了在复习课中进行项目式学习的程序和方法,为物理复习课的教学提供了一种新思路.     

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.     

Hybrid Wavelength and Code Division Multiple Access in Optical Networks

A review of schemes for multiple access in fiber optic networks shows that a hybrid of wavelength and code division multiple access (WCDMA) combines the best features of both. In particular, the hybrid scheme retains the large information carrying capacity of wavelength division multiple access (WDMA) and flexibility of code division multiple access (CDMA). In this paper WDMA, optical CDMA (OCDMA), and WCDMA networks are discussed. In OCDMA networks, concept of incoherent and coherent coding including inverse decoding and matched filter is introduced. The delay performance of both WDMA and WCDMA networks, under the simple suboptimum access protocols based on cyclic search, is computed. It has been shown quantitatively that tuning delay significantly affects the delay performance of both WDMA and WCDMA networks. Futhermore, delay performance of WCDMA networks is always better than the WDMA networks for the same tuning delay, load, and number of users.     

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.