信息技术与物理学基础课程的整合及其教学实践

本文介绍了我们在信息技术与物理学基础课程教学过程的整合方面开展的一些工作及其教学实践，其中重点介绍了基于校园网的大学物理课程网络辅助教学系统的构建与教学应用；基于课堂教学的大学物理课程教学模拟软件的研制开发与教学应用；基于校园网的开放式物理实验网络选课系统的研制开发与教学应用等．     

“三位一体”下大学物理实践类课程探索——以“现代物理学在创新创业中的应用”课程为例

本文阐述了苏州大学物理科学与技术学院新生实践衔接类课程——“现代物理学在创新创业中的应用”的建设历程。为了帮助学生从脑到心完成大中学习的转型，课程充分发挥信息技术和朋辈学习的优势，结成教学共同体，立足“学生中心”。课程经历6轮教学周期，形成了以立德树人为根本，以课程实验项目化、阶梯化和成果化为建设思路的三位一体教学模式。课程实施过程中，我们以教学产出为导向，持续改进课程，积累了一些在创新人才培养奠基方面的有益尝试，为新时代物理实践类课程的建设提供思考。     

军队院校大学物理实验思政教学实例探讨

遵循从整体上结合学院的定位和课程的特点，确定大学物理实验的思政主题，从细节上围绕主题开展思政元素挖掘，融入教学实践的设计思路，以基础性实验“拉伸法测金属丝的杨氏模量”为例，采取问题教学，注重教员精讲，学员多研讨多练习，融入军事应用，从课前、课中、课后开展了军队院校大学物理实验课程思政教学实例探讨.这突显了大学物理实验课程教学的军政特色，为实验教学提供了一定的指导，更好地服务于立德树人，为战育人.     

应用物理学专业光电信息技术方向建设的研究

阐述了长沙大学应用物理学专业光电信息技术方向建设的重要性，分析了专业现状，提出了专业实验室建设，课程与教材建设的目标，介绍了专业培养目标，专业特色，专业课程，教学实践的设置以及教学进程安排。     

机械专业有限元法课程几个关键问题的思考与探索

针对机械专业有限元法课程教学过程中出现的问题，提出了解决方案。在理论教学中重点突出物理意义与工程实际结合同时简化公式推导过程的难点，在软件操作培训过程突出熟练掌握有限元基本技能的方法，在应用培训中侧重于对工程实际和创新意识的培养。     

以物理人 以文化之——“双新”背景下基于单元进行物理文化教学的思考与实践

在新课程、新教材的背景下确立“体现物理的文化价值”作为物理课堂的一条基本教学理念，强化单元构建的逻辑与结构，强调单元实施的情境与实证特点，追求单元教学的人文与科技特征，强化单元评价学以致用和用以致学的特性，加强对物理文化教育功能的开发与应用，彰显物理课程教学的系统性、真实性、人文性和价值性文化，使物理课程教学真正成为传承(人化)与教化(化人)的工具与载体.     

新课程视野下大学物理教学改革策略分析

基础课程改革的不断深入展开，使大学课程的受众群体在知识结构、学习能力和学习方式等方面都与以往有了较大差异。本文以大学物理课程为例，通过对基础课程改革主要理念的简单介绍，从教学理念、教学组织、教学方法和学习评价四方面阐述大学课程应该如何改革，做好与基础课程的教学衔接。     

网络化《大学物理》教学体系的建设和应用

文章介绍了基于网络技术的《大学物理》教学体系的建设和应用，该体系以精品课程建设为依托，建设《大学物理》课程网络资源，在正常教学中引入网络化联班教学模式．实现主讲教室和其他多媒体副教室之间的音视频及教学课件传输，并对信号进行实时采集和编辑处理，形成可供网络传输的流媒体课件．在保证教学质量的前提下，该网络化教学体系有效地扩大了教学规模，实现了教学手段的优化和教学资源共享．     

深化教学内容改革的尝试

本文结合在电气工程系应用电子技术专业物理课程中关于“电容和电场能量”的一次公开课，探索在教学中从应用角度引入问题；在教学过程中紧扣“撑握概念、强化应用”；以讲清原理、概念在工程技术应用为主，不过多涉及技术细节以及注意培养学生工程思维方法等问题。     

固体物理研究性教学探索与实践

针对固体物理课程特点，在教学中进行一些研究性教学探索与实践。为提高固体物理课程的教学质量和培养研究性人才提出新的思路和方法。在对物理专业学生的教学实践中，取得了良好的教学效果。     

Theoretical analysis and simulation of conjugate heights for dual-conjugate AO system in lidar

A multi-conjugate adaptive optics （MCAO） can offer a possibility of widening field of view （FOV） characterized by the isoplanatic angle, and the choose of conjugate height becomes a basic problem for MCAO, which influences the size of iosplanatic angle. Considering the application of lidar, the isoplanatic angle＇s expressions of two deformable mirrors （DMs） MCAO for uplink and downlink are deduced. The effects of conjugate heights for dual-conjugate AO are thoughtfully discussed, and the isoplanatic angles are further analyzed. The results show that the isopanatic angle varies with the conjugate height and reaches the maximum as the conjugate height is at the optimal altitude. Moreover, the optimal conjugate height changes with the propagation distance.     

Quick single-photon detector with many avalanche photo diodes working on the time division

Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system.A new idea is put up to design a quick single-photon detector.This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs).Au of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal.The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector.The single-photon prompt detection can come true for high repetition-rate pulses.The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use.     

Characterization of PolyA and PolyC mismatches by Raman spectroscopy

A.C mismatches are studied by Raman spectral characterization of PolyA, PolyC, and their equimolar complex in solution of 0.14 mol/L Na ,pH7.0.Experimental results show that A·C mismatches occur to be A/B (mainly A) conformers, and unlike Watson-Crick base pairing, this kind of mismatches is stabilized by only one hydrogen bond involving cytosine N4H2 and adenine N7.The formation of A·C complex makes the base stacking interactions much stronger, and conformation of the backbone more ordered, which leads to obvious Raman hypochromic effect with some shifts in corresponding bands.     

Improvement of four-wave mixing-based wavelength conversion efficiency in dispersion shifted fiber by 40-GHz clock pumping

40-GHz clock modulated signal as a pump to improve the efficiency of four-wave mixing (FWM)-based wavelength conversion in a 26.5-km dispersion shifted fiber (DSF) is investigated. The experimental results demonstrate that the conjugated FWM component has higher intensity with the clock pumping than that with the continuous-wave (CW) light pumping. The improvement of FWM-based wavelength conversion efficiency is negligible when the pump power is less than Brillouin threshold. But when the pump power is greater than Brillouin threshold, the improvement becomes significant and increases with the increment of pump power. The improvement can increase up to 9 dB if pump power reaches 17 dBm.     

Multi-pulse operation of a Kerr-lens mode-locked femtosecond laser

Our experimental results show that the presence of a proper amount of negative group velocity dispersion is essential to multi-pulse operation of a Kerr-lens mode-locked femtosecond laser. We demonstrate that the pulse separations and the number of pulses contained within a cavity round trip are strongly dependent on the initial perturbations. The results allow us to get a better understanding on the influences of the convoluted self-phase modulation and intra-cavity dispersions on the stable multi-pulse oscillation in a Kerr-lens mode-locked femtosecond laser.     

Propagation of Helmholtz-Gauss beams in weak turbulent atmosphere

Based on the Rytov approximation of light propagation in weak turbulent atmosphere,the closed-form expressions of field and average irradiance of each one of the four fundamental families of Helmholtz-Gauss (HzG)beams:cosine-Gauss beams,stationary Mathieu-Gauss beams,stationary parabolic-Gauss beams,and Bessel-Gauss beams,which are propagating in weak turbulent atmosphere,are obtained.The results show that the field and average irradiance can be written as the product of four factors:complex amplitude depending on the z-coordinate only,a Ganssian beam.a factor of complex phase perturbation induced by atmospheric turbulence,and a complex scaled version of the transverse shape of the non-diffracting beam.The effect of weak atmospheric turbulence on irradiance distribution of the HzG beam can be ignored.     

An effective method for reducing speckle noise in digital holography

An effective method for reducing the speckle noise in digital holography is proposed in this paper.Different from the methods based on classical filtering technique,it utilizes the multiple holograms which are generated by rotating the illuminating light continuously.The intensity images reconstructed by a series of holograms generated by rotating the illuminating light possess different speckle patterns.Hence by properly averaging the reconstructed intensity fields,the speckle noises can be reduced greatly.Experimental results show that the proposed method is simple and effective to reduce speckle noise in digital holography.     

Influence of purity of HfO2 on reflectance of ultraviolet multilayer

The impurities in two kinds of HfO2 materials and in their corresponding single layer thin films were determined through glow discharge mass spectrum technology and secondary ion mass spectrometry(SIMS) equipment respectively.It was found that ZrO2 was the main impurity in the two kinds of HfO2 either in the original HfO2 materials or in the electron beam deposited films.In addition,the difference of Zr content in the two kinds of HfO2 single laver films was much laxger than that of the other impurities such as Ti and Fe.which showed that it was just ZrO2 that made the difference between the optical performance of the film products including the two kinds of HfO2.With these two kinds of HfO2 and the same kind of SiO2.we deposited HfO2/SiO2 multilayer reflective coatings at the wavelength of 266 nm.Experimental results showed that the reflectances of these two mirrors were about 99.85% and 99.15% respectively,which agreed well with the designed results what were based on the optical constants obtained from the corresponding single layer thin films.     

Speech enhancement by array crosstalk resistant ANC and spectrum subtraction

Microphone array-based speech enhancement has great importance for speech communications and speech recognition. To reduce the aperture of the microphone array and to increase the effect of the speech enhancement will greatly broaden the application areas of the microphone array. An array crosstalk resistant adaptive noise cancellation method is therefore presented. And then an improved spectral subtraction algorithm is further cascaded to obtain better enhancement results. Theoretic analysis and experiments indicate that the proposed scheme needs only a very small microphone array while it simultaneously achieves a higher SNR improvement. Besides, the proposed scheme can be used in many noisy environments and is easy for real-time implementation.