基于液体光学补偿自动定向基准的研究

 用理想倍率元件进行匹配,对4种液体光学补偿通用构架模型分析推导,得出如单液面、双液面、液体中的反射及透射等诸多平行光路中补偿光学结构的数学模型。设计和演变的光学结构是在液体中置反射镜,光线两次通过液体自然表面,再与理想倍率的平板或施密特棱镜匹配所构成的,水平定向和坡度定角精度能够达到0.01″。给出液体补偿方式匹配表对文中未举例的其他液体光学补偿结构的构成和演变方式具有指导意义。最后对设计的结构补偿误差进行分析和实验验证,给出水平补偿曲线、横摆补偿曲线和像旋补偿曲线。     

Temperature and strain sensitivities of surface and hybrid acoustic wave Brillouin scattering in optical microfibers

Temperature and strain sensitivities of surface acoustic wave (SAW) and hybrid acoustic wave (HAW) Brillouin scattering (BS) in 1 μm-1.3 μm diameter optical microfibers are simulated. In contrast to stimulated Brillouin scattering (SBS) from bulk acoustic wave in standard optical fiber, SAW and HAW BS, due to SAWs and HAWs induced by the coupling of longitudinal and shear waves and propagating along the surface and core of microfiber respectively, facilitate innovative detection in optical microfibers sensing. The highest temperature and strain sensitivities of the hybrid acoustic modes (HAMs) are 1.082 MHz/℃ and 0.0289 MHz/με, respectively, which is suitable for microfiber sensing application of high temperature and strain resolutions. Meanwhile, the temperature and strain sensitivities of the SAMs are less affected by fiber diameter changes, ranging from 0.05 MHz/℃/μ to 0.25 MHz/℃/μ and 1×10^-4 MHz/με/μ to 5×10^-4 MHz/με/μ, respectively. It can be found that that SAW BS for temperature and strain sensing would put less stress on manufacturing constraints for optical microfibers. Besides, the simultaneous sensing of temperature and strain can be realized by SAW and HAW BS, with temperature and strain errors as low as 0.30 ℃-0.34 ℃ and 14.47 με-16.25 με.     

基于NS混合模型的中国利率期限结构动态估计比较研究

采用NS混合模型动态估计中国利率期限结构,考察动态NS模型,无套利NS模型及广义无套利NS模型等NS混合模型对我国利率期限结构的动态估计效率,比较NS混合模型的样本外预测能力,检验无套利约束对混合模型动态估计的影响.本文的经验分析结果表明:无套利条件的引入增强了NS混合模型的样本内动态估计能力和样本外预测能力;五因素的广义无套利NS模型(AFGNS)无论在利率期限结构样本内动态估计还是在总体预测效率上都要高于其他模型,可将其作为利率期限结构研究的基础模型:     

弯张壳体装配位移的理论计算及实验测量

精确地控制施加于驱动元件上的预应力，对换能器设计有着重要意义，本文结合我们的课题研究工作，用有限元方法，计算了Ⅶ型水声弯张换器壳体给驱动元件施加一定预应力时，壳体所需的装配位称的大小，并通过初步实验作了验证，本文的计算及装配方法，可以推广到其它类型的弯张换能器中。     

扫描干涉场曝光系统中周期设定对曝光刻线相位的影响

扫描干涉场曝光系统中的干涉条纹周期是相位锁定系统的重要参数,其设定值与名义值之间的偏差会引起相邻扫描间的干涉条纹相位拼接误差。为获取以扫描曝光方式所制作光栅的衍射波前特征,根据步进扫描曝光的特点及动态相位锁定的工作原理,建立了扫描曝光的数学模型,给出了曝光刻线误差及曝光光栅周期的变化规律,并进行了相关实验验证。结果表明,相位锁定中周期设定误差会带来周期性的刻线误差。曝光光栅周期会随周期设定值的变化而改变,当周期设定误差较小时,曝光光栅周期等于周期设定值。对于曝光光斑束腰半径为0.9mm、曝光步进间隔为0.6mm、曝光条纹周期为555.6nm的系统参数,周期设定的相对误差小于278×10-6时,周期性的刻线误差小于1nm。若要求曝光对比度大于0.9,则周期设定的相对误差需要控制在92.6×10-6以内,周期设定值及曝光光栅周期的可变范围为102.8pm。     

A capacitance servo control plunger for accurate lifetime measurement

The recoil distance Doppler shift method has been widely used in the study of nuclear structure to determine the level lifetime and absolute transition probabilities.A capacitance servo control plunger based on this method has been successfully developed by the Nuclear Structure Group of the China Institute of Atomic Energy.Three microscopes were employed to check the parallelism and can therefore guarantee a delicate measurement of the distance between the target and the stopper.This new plunger made a successful performance in the test experiment and the measured lifetime of the 2~+→0~+ transition in ~(78)Kr is in agreement with the previous value.     

Identification of a 9/2~-[505] isomer in the neutron-rich ~(193)Os nucleus

The neutron rich nucleus ¹⁹³Os was produced in the ¹⁹²Os(⁷Li, ⁶Li)¹⁹³Os reaction. An isomeric state based on the 9/2^-[505] Nilsson orbital was identified in the present work. The half-life of the isomeric state was extracted and discussed in terms of the K quantum number. A level scheme built on the isomeric state was proposed based on the experimental data.     

一种高温超导薄膜临界电流密度感应法无损测量装置

临界电流密度(Jc)是超导薄膜、块材、带材等材料的基本性能参数,决定了超导器件及设备的性能和稳定性,简易、准确的无损Jc测量方法对超导材料特性研究及超导器件的性能保障具有重要意义。本文介绍一种基于三次谐波测量的高温超导薄膜局部临界电流密度测量方法和测量装置。研究显示,在一定幅值的初级线圈交流磁场激励下,Ⅱ型超导体会产生非线性响应,通过分析次级线圈中三次谐波分量的幅值变化,可以推算超导体的局部临界电流密度。我们搭建了一套基于此原理、适用于液氮条件的测量装置。通过对比实验,对测量的准确性进行了验证,尤其针对微弱的微纳伏量级被测信号,采取了必要的噪声抑制措施,并通过对测量数据的校正,提高了测量的准确度。实验研究显示,基于三次谐波测量的方法对于超导薄膜的临界电流密度的测量准确度较高,进行误差修正后,测量装置的误差小于10%。超导薄膜感应法测量装置的搭建十分方便,而且应用灵活,对于大面积超导薄膜的临界电流密度分布测量具有十分显著的优势。     

一种高效的在交变磁场中加转转子的装置（英文）

使用交变或均匀磁场对导电转子进行加速或减速的技术,广泛应用于转速稳定的静电陀螺,用于姿态控制的力矩球和磁场支持下的超高速离心机等领域。大气隙的磁性驱动器难以获得高效率。通过优化绕组的结构参数,提出了一种高效的使用交变磁场中加速导电转子的装置。首先,阐明了提高设备效率的关键因素。然后,根据器件的机械结构建立了等效磁路模型,并用基尔霍夫定律求解得到穿过球体的磁通量。通过考察磁芯材料和尺寸、气隙、漏磁通、绕组损耗和磁场均匀性等因素对磁通量的影响,推导出提高施矩效率的一般准则。基于这些准则,在设备尺寸的限制下设计出了可以产生更均匀的磁场的宽线圈绕组。接着,用3D有限元模型,仿真并验证了这些设计准则。最后,制作了窄绕线和宽绕线两种样机,并通过加速试验证明宽绕组比窄绕组获得两倍左右的加转力矩,并且产生一半的焦耳热。     

Poly(3,4-ethylenedioxythiophene methanol)/ascorbate oxidase/nafion-single-walled carbon nanotubes biosensor for voltammetric detection of Vitamin C

Vitamin C（VC） content in commercial juices was voltammetrically determined using a highly selective and sensitive poly（3,4-ethylenedioxythiophene methanol）/ascorbate oxidase/Nafion-single-walled carbon nanotubes （PEDOTM/AO/Nafion-SWCNT） biosensor.The biocompatible PEDOTM matrix was prepared facilely by the one-step electrochemical deposition technique in lithium perchlorate aqueous solutions.AO was dip-coated on the surface of the biocompatible PEDOTM matrix.The mixture of Nafion-SWCNT was dip-cast onto the surface of AO layer when it was obtained by blending Nafion solution and SWCNT dispersion together in a volume ratio of 1:1.The prepared PEDOTM/AO/Nafion-SWCNT biosensor was used for the voltammetric determination of VC,which exhibited the good linear range(4.0×10^-5-3×10^-3mol/L),low detection limit（13μmol/L）,pronounced sensitivity(1.4072 mA（mmol/L）^-1 cm^-2),high bioaffinity（low apparent Michaelis-Menten constant）,good stability（good repeatability）,high specificity（good anti-interference ability） coupled with the good reliability and feasibility（the determination of VC in commercial juices）. Meanwhile,the good aqueous solubility and the low onset oxidation potential of EDOTM will be more beneficial to the application in biosensor field compared to 3,4-ethylenedioxythiophene.Moreover,the good biocompatibility of PEDOTM matrix and high selectivity of Nafion-SWCNT films also provide a promising platform for the development of biosensing devices.