基于激光的测量技术在燃烧流场诊断中的应用

分析了工业发动机湍流燃烧场诊断的需求和面临的挑战,介绍了燃烧流场组分浓度、温度和速度等主要参数的激光测量技术,给出了其基本原理、在燃烧场诊断中的应用和国内外研究现状,分析了不同技术的特点及其适用性。简介了多参数综合诊断的作用和进展。对目前诊断和测量存在的主要问题和发展趋势进行了探讨。     

顺专电子技术基础实验教学课程改革初探

阐明了师专电子技术基础实验教学内容和课程改革的必要性和紧迫性,并提出了改革的方案和具体内容,总结了改革的初步经验和效果。     

低温脉动热管的研究进展

阐述了低温脉动热管的原理和特点,分析了低温脉动热管与中高温脉动热管的不同之处,总结了低温脉动热管理论模拟和实验两方面的研究现状和发展趋势,介绍了在快速细胞冷冻和超导磁体冷却上的应用示例,并针对研究现状,指出了目前低温脉动热管研究存在的问题,提出了未来的研究和发展方向。     

研究型固体物理课程教学探索与实践

介绍了研究型教学的主要特点,重点论述了研究型固体物理课程的设计和实践.固体物理课程教学中,针对教学目标、教学内容、教学方法和考核方式等进行了研究型教学的改革尝试,提高了学生的研究素质,取得了良好的教学效果,为提高教学质量和人才培养质量提供了新的思路和方法.     

EAST中央控制系统

描述了EAST中央控制系统和EAST虚拟合作实验室系统的体系结构和各个部分的主要功能和设计思想。EAST中央控制系统主要功能是协调统一各个控制、诊断、采集子系统,为各个子系统提供统一的控制接口。EAST中央控制系统制定和规范了与各分控系统之间的通信协议,加强了对各分控系统的控制,统一和规范了控制数据的发布和控制参数的设置。系统按照功能模块设计和实施,有效地提高了系统的升级和扩展能力。     

师专电子技术基础实验教学课程改革初探

阐明了师专电子技术基础实验教学内容和课程改革的必要性和紧迫性,并提出了改革的方案和具体内容,总结了改革的初步经验和效果.     

叉形光栅法产生分数阶涡旋光的实验探究

衍射和光栅是基础光学课程和光学实验的重要内容，在传统光学技术和前沿科学研究中有重要的作用和应用。文章以分数阶涡旋光为研究对象，利用空间光调制器设计了基于叉形光栅的衍射效应产生分数阶涡旋光的实验，编写了分数阶叉形光栅的计算机程序，实验上产生和观测了分数阶涡旋光，分析了分数阶涡旋光的特点和强度分布。通过本实验，学生进一步加深了对衍射和光栅特性的理解，激发了对光学前沿研究和探索的兴趣，拓展了学生的专业知识，提升了对光学研究和光场调控的创新意识。     

傅里叶思想的精髓及其伟大之处

介绍了傅里叶级数和傅里叶变换的基本思想,从哲学、物理学和数学的角度阐述了其深刻涵义和伟大之处.指出了傅里叶的思想和牛顿-莱布尼茨的思想的不同之处.导出了四维协变的傅里叶变换公式.简要介绍了傅里叶级数和变换在物理学中的应用.     

利用智能手机居家测量声速和重力加速度

利用两部智能手机,借助手机软件phyphox在家进行了多普勒效应实验.两部手机分别作为接收器和声源,让接收器和声源分别做自由落体运动,测得了接收频率和运动速度随时间的变化曲线,通过对数据的处理得到了声速和重力加速度值,并和理论值进行了对比,验证了用手机进行多普勒效应实验的可靠性,为以后实验的进行以及数据处理提供了参考.     

船的加速度和速度佯谬——再论用绳拉船靠岸的问题

讨论了求解船的速度和加速度的一些似是而非的问题，对使用速度合成和分解的方法进行了较详细的分析，阐释了佯谬的根源，深化了对问题的认识和理解     

Faithful quantum secure direct communication protocol against collective noise

An improved quantum secure direct communication (QSDC) protocol is proposed in this paper.Blocks of entangled photon pairs are transmitted in two steps in which secret messages are transmitted directly.The single logical qubits and unitary operations under decoherence free subspaces are presented and the generalized Bell states are constructed which are immune to the collective noise.Two steps of qubit transmission are used in this protocol to guarantee the security of communication.The security of the protocol against various attacks are discussed.     

约束对Birkhoff系统Noether对称性和守恒量的影响

研究约束对Birkhoff系统的Noether对称性和守恒量的影响．首先，建立了Birkhoff系统的运动微分方程．其次，给出了系统Noether对称性的判据．然后，讨论了受约束作用后，Birkhoff系统的Noether对称性发生的变化，并给出了系统的Noether对称性以及守恒量保持不变的条件．最后，举例说明结果的应用． 关键词： 分析力学 Birkhoff系统 约束 Noether对称性 守恒量     

Aerial Video Trackers Review

Target tracking technology that is based on aerial videos is widely used in many fields; however, this technology has challenges, such as image jitter, target blur, high data dimensionality, and large changes in the target scale. In this paper, the research status of aerial video tracking and the characteristics, background complexity and tracking diversity of aerial video targets are summarized. Based on the findings, the key technologies that are related to tracking are elaborated according to the target type, number of targets and applicable scene system. The tracking algorithms are classified according to the type of target, and the target tracking algorithms that are based on deep learning are classified according to the network structure. Commonly used aerial photography datasets are described, and the accuracies of commonly used target tracking methods are evaluated in an aerial photography dataset, namely, UAV123, and a long-video dataset, namely, UAV20L. Potential problems are discussed, and possible future research directions and corresponding development trends in this field are analyzed and summarized.     

Calculated correlations between material parameters and electro-optical performance of twisted nematic displays

Computer calculations of the optical transmission of TN-LCDs as a function of the applied voltage are presented. In particular, the wavelength and angular dependence of half transmission voltages and sharpness of transmission curves are examined. Furthermore the lowest relaxation rates of the linearized dynamical equations, neglecting backflow effects are calculated. The dielectrical anisotropy and the elastic parameters are varied systematically in the calculations over ranges that actually occur in nematics. Although the results are too complex to be condensed in simple general statements they are helpfull in designing optimal nematic mixtures for a given display application.     

亲水性材料固相萃取-紫外导数光谱法检测血中茚满二酮灯抗凝 …

本文报导了血中茚满二酮类抗凝血杀鼠剂敌鼠、氯敌鼠、杀鼠酮的亲水性材料固相萃取－紫外导数光谱检测法。血样用pＨ５缓冲液等体积稀释后加于西雷脱硅藻土柱上,柱用乙酸乙 酯洗脱,将洗脱液挥发干净,剩余物用pＨ１０缓冲液溶解,测定所得溶液的二阶导数光谱进行定性和定量分析。三种杀鼠剂以１０mg／Ｌ的量加于空白血中测得萃取率为８５％以上,血中三种杀鼠剂的检出限低于２ｍｇ／Ｌ。萃取中亲水性硅藻土可用硅胶和氧化铝代替,     

Concurrence and Quantum Discord in the Eigenstates of Chaotic and Integrable Spin Chains

There has been some substantial research about the connections between quantum chaos and quantum correlations in many-body systems. This paper discusses a specific aspect of correlations in chaotic spin models, through concurrence (CC) and quantum discord (QD). Numerical results obtained in the quantum chaos regime and in the integrable regime of spin-1/2 chains are compared. The CC and QD between nearest-neighbor pairs of spins are calculated for all energy eigenstates. The results show that, depending on whether the system is in a chaotic or integrable regime, the distribution of CC and QD are markedly different. On the other hand, in the integrable regime, states with the largest CC and QD are found in the middle of the spectrum, in the chaotic regime, the states with the strongest correlations are found at low and high energies at the edges of spectrum. Finite-size effects are analyzed, and some of the results are discussed in the light of the eigenstate thermalization hypothesis.     

光学合成孔径系统的光束控制

本文给出真空中光学合成孔径系统光束控制的物理模型。计算机数值模拟结果与理论分析吻合。另外，对孔径的活塞型和倾斜型误差的影响也进行了探讨。     

无旋性前进重力波传递在均匀流中的Lagrangen解析解与试验验证Ⅱ.试验验证

针对文献[1]中的无旋性自由表面周期性规则前进重力波传递在均匀流中,本文以与前进波波向同向与反向的均匀流两种特例情况,进行试验测量,所得的波形曲线、流速分布、流体质点的运动轨迹与运动周期及其质量传输速率与Lagrange平均高程等特性,均与文献[1]中全以Lagrange方式所得的三阶解结果符合得很好.这证实本研究取定的标注流体质点的参数,正好为其在原静止水中的位置坐标值.同时亦证实波流场中由流体质点所构成的波形曲线,其波长皆同于(纯)前进波,而其传播速度为(纯)前进波波速与均匀流流速之和是具Doppler效应的;而流体质点的运动周期与其运动周期平均高程、及其质量传输速率扣掉均匀流流速等,都与(纯)前进波的相符.另外,亦揭示出流体质点的运动轨迹,在前进波波向与均匀流同向中,当流体质点在波谷断面处时沿前进波波向的流速分量为反向、零与正向时,则其形状分别为朝波向前进的扁长辐状余摆线、在波谷断面处成尖点朝下的滚轮状线与短辐形余摆线;而在前进波波向与均匀流反向中,当流体质点的质量传输速率为沿前进波波向为正向与零时,则其形状分别为朝波向前进的缩短的扁长辐形余摆线与长轴在前进波波向上椭圆形封闭曲线;而当流体质点的质量传输速率为反前进波波向,但质点在波峰断面处时沿前进波波向的流速分量分别为正向、零与反向时,则其形状分别为反波向前进的倒扁长辐形余摆线、在波峰断面处成尖点朝上的倒滚轮状线与倒短辐形余摆线.     

导板光互连光斑位置偏移的研究

随着人们对信息处理与交换速度和容量提出的更高的要求,出现了光互连．它具有并行处理、传播速度快、信息量大、空间频带宽、串音小和能量损耗低等优点,因此它在光计算机和信息处理领域中成为越来越吸引人的课题［１～４］提出光电结合的计算机系统．实现光－电混合计算．ＳａｕｅｒＦ提出了将电子元件组成的电路板安装在光导板上的方法［５,６］．每个电路板除了包括计算机本身要求的功能外,还装上发射信号的光源和接收信号的探测器,借助全息元件的耦合,以光导板作为光信息交换的通道．这种互连方式传输信息,结合光电优点,利用Ｂｒ…     

Triaxial Shape,Signature Splitting,and Shape Coexistence in 127,129,131Nd

Signature splitting and shape coexistence at high spin in the neutron deficient nucleus ¹²⁹Nd are investigated with the configuration-dependent cranked Nilsson-Strutinsky approach. The calculated bands are compared with the observed signature partner bands and very good agreement results at high spin are obtained. The observed deformed bands are confirmed as normal and highly deformed and their properties are explained theoretically. Terminating states in ¹²⁹Nd and other terminations are predicted. There is shape coexistence within the same configuration from low-spin states to high-spin states. Possible normal and highly deformed bands with rotation around the intermediate principal axis in several interesting configurations of ¹²⁹Nd are discussed. The experimental results for ¹³¹Nd are simply discussed and the calculated bands are in good agreement with observed bands at high spin. Triaxial shapes in ¹²⁷Nd with a triaxial deformation of γ～-12^º are predicted and should be observed experimentally. The value of negative γ of π(h_11/2)⁴ν(h_11/2)⁷ configuration increases with neutron number increasing in ^127,129,131Nd. The triaxial shape evolutions with neutron number increasing in ^127,129,131Nd and in ^{126,128,130,132}Pr are explained by the strong driving force of specified single particle orbitals towards to triaxial shape.