声速测定实验不确定度、误差之比较研究

对声速测定的两种实验方法,进行了对比性实验。结合其误差分析、不确定度进行了比较性分析研究。     

啁啾脉冲在正常色散光纤中频域特性实验研究

对负啁啾脉冲在正常色散光纤中的频域特性进行了实验研究,并对实验结果进行了数值分析,实验和数值分析结果基本一致．     

倾斜轨道上运动小球实验探讨

本文对小球在倾轨道上的运动规律进行了理论上的分析．为验证理论结果，设计了实验装置，进行了实验．实验结果证明理论分析是正确的．     

大学物理实验课教学改革必要性及其构想

介绍了学校大学物理实验课程开设的现状,分析了在校进行大学物理实验课程教学改革的必要性,结合实验教学体会,提出了在现有的实验条件和未来可能创造的实验条件的情况下,如何进行大学物理实验课程教学改革的几点构想。     

激波管风洞中叶栅测压实验与计算研究

本文利用激波管平面叶栅风洞在四种工况下进行了某叶型叶表压力分布测量实验。该类短周期实验方式的测量精度是值得关注的大问题，为此文中对实验误差及短周期实验测量的合理性进行了分析。继而将实验数据与两种模型下的数值计算结果进行了比较，其中实验结果与按实际情况建立的模型１计算结果吻合。通过实验结果与模型２计算结果比较发现，实验中存在着影响叶栅通道流动周期性的因素，本文仔细分析了该因素可能产生的影响，为今后对该风洞实验段进行改造提供了基础。     

固体比热容测定实验的研究

从牛顿冷却定律入手,对固体比热容测定实验的散热修正原理进行了理论分析,并根据理论分析对传统的实验方案进行改进,不仅降低了实验操作难度,减小了误差,而且有助于学生实践创新能力的培养。     

偏振光的干涉场分布特征数值模拟及实验研究

从偏振光的产生出发,对不同偏振态的偏振光的干涉场分布进行了数值模拟,得出了不同偏振态干涉场的特征分布,并对不同情况进行了实验,分析讨论了实验结果,为偏振光实验的教学和实验结果的分析提供了依据.     

基于多信息融合回流离子特性的实验研究

 简要介绍了回流离子特性参数的检测要求,分析了多种不同检测方法的特点,进行了离子检测综合实验方案的设计。介绍了激光干涉+分幅相机测量、法拉第筒测量、基于单晶硅片的固体径迹测量3种实验方法及实验结果的分析过程,对各自的原始实验数据进行了具体分析,给出了分析结果。对3种实验方法的分析结果,采用信息融合技术,对电子束打靶时所产生的回流离子的种类、运动速度和密度等特性给出了综合性的分析结论,有助于进一步正确认识束靶作用区的物理特性。     

汞谱线的塞曼效应分析与朗德g因子的测量

对汞谱线塞曼效应进行了理论分析,通过利用CCD观测系统获取了塞曼效应实验分裂干涉圆环图像,证明了实验现象与理论分析完全一致,并对实验数据进行处理,定量测量了朗德g因子,发现误差较小。     

“平面镜成像特点”的实验改进

“平面镜成像的特点”实验是初中光学重要的实验之一。针对教材中实验存在的一些不足,不少教师在教学实践中对该实验进行了改进。本文对此进行了综述与比较分析。     

The number of least degrees of freedom required for a polarization controller to transform any state of polarization to any other output covering the entire Poincaré sphere

Using two typical types of polarization controller, this paper analyses theoretically and experimentally the fact that it is necessary to adjust at least three instead of two waveplates in order to transform any state of polarization to any other output covering the entire Poincar\'{e} sphere. The experimental results are exactly in accordance with the theory discussed in this paper. It has corrected the conventional and inaccurate point of view that two waveplates of a polarization controller are adequate to complete the transformation of state of polarization.     

一道物理实验设计选题的两种实验验证

对一道运用常规思维无法解决的物理实验设计选题,从转动惯量和发声音调两个视角给出了实验方案及实验验证.     

用偏心碰撞理论分析车祸

用偏心碰撞理论分析了两个车祸特例，求出了碰前两车各自的速度及碰后转动的角速度。     

从能量的角度讨论两体碰撞问题

从能量角度导出了两体对心碰撞的能量损失公式,重新讨论了恢复系数的物理意义．     

菲涅尔双棱镜干涉实验中双棱镜两种放置方法的讨论

在菲涅尔双棱镜干涉实验中,双棱镜有两种不同的放置方法,分析了这两种放置方法中两虚光源的距离、干涉区域范围、干涉条纹间距、干涉条纹数目应相同,因而得到双棱镜的两种放置方法是等价的结论。     

机械能守恒定律及动量守恒定律演示仪器的制作

制作一种可以同时验证机械能守恒和动量守恒的实验装置,并通过这两个实验现象的对比更显著地体现了两个实验的物理现象与原理,有利于学生对机械能守恒与动量守恒原理的理解与认知。     

Time reversal of pseudo-spin 1/2 degrees of freedom

We show that pseudo-spin 1/2 degrees of freedom can be categorized in two types according to their behavior under time reversal. One type exhibits the properties of ordinary spin whose three Cartesian components are all odd under time reversal. For the second type, only one of the components is odd while the other two are even. We discuss several physical examples for this second type of pseudo-spin and highlight observable consequences that can be used to distinguish it from ordinary spin.     

Application of a recent solution of the Navier–Stokes equation to flow on the surface of a globe

We reduce an exact solution of the 3D Navier–Stokes equation (Muriel, 2011) [1] to two dimensions to model flow on the surface of a globe, producing the following results: (a) an analytic discovery of the time evolution of two streams, one each above and below the equator, (b) analytic speed-up of modeling bypassing iterative numerical simulation.     

基于非线性控制的超混沌Chen系统混沌同步

研究了基于非线性控制的超混沌Chen系统的混沌同步问题.基于Lyapunov稳定性理论，设计了非线性控制器，改进了Jiang和Huang等设计的同步误差系统的Lyapunov函数形式，理论证明了超混沌Chen系统的自同步和超混沌Chen系统与超混沌R?ssler系统的异结构同步.数值模拟进一步验证了所提出方案的有效性. 关键词： 超混沌Chen系统 自同步 异结构同步 非线性控制器     

Reliability of Clinician-Based (GRBAS and CAPE-V) and Patient-Based (V-RQOL and IPVI) Documentation of Voice Disorders

This study examined the reliability of two methods for documenting voice quality by clinicians and compared the methods for documenting patients' perceptions of voice quality. It involved a prospective reliability study and a retrospective chart review. Reliability of two clinician-based voice assessment protocols-Grade, Roughness, Breathiness, Asthenia, Strain (GRBAS) and Consensus Auditory Perceptual Evaluation-Voice (CAPE-V)-was evaluated. These two protocols were then compared after use in voice assessments of 42 males and 61 females performed by a certified speech-language pathologist specializing in the assessment of voice disorders. In addition, two patient-based scales (Voice Related Quality of Life, or V-RQOL, and Iowa Patient's Voice Index, or IPVI) obtained from the same patients were compared with each other and with the clinician-based scales. Reliability of clinicians' ratings of overall severity of dysphonia using GRBAS and CAPE-V scales was very good (r>0.80). Agreement between V-RQOL Total scores and IPVI ratings of the patient's perceptions of impact of dysphonia was less strong (Spearman's r=-0.76). There was relatively weak agreement between patient-based and clinician-based scales. Clinician's perceptions of dysphonia appeared to be reliable and unaffected by rating tool, as indicated by the high level of agreement between the two rating systems when they were used together. The CAPE-V system appeared to be more sensitive to small differences within and among patients than the GRBAS system. The V-RQOL and IPVI approaches to documenting patient's perceptions of dysphonia agreed less well possibly due to differences in patient dependence on voice and on interpretation of the rating tool items. The differences between clinician-based and patient-based data support the conclusion that clinicians and patients experience and consider dysphonia very differently.