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。     

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。     

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.     

短周期涡轮实验台快速阀设计计算及试验分析

本文介绍了短周期涡轮实验台关键设备之——快速阀的工作原理,建立了数学模型和计算方法,进行了设计性能计算。分别在大气和真空条件下对快速阀进行了调试和测量,并对计算和实验结果进行了分析。     

传感器在固体熔化凝固实验中的运用

基于固体的熔化和凝固实验的传统做法,结合现代测量技术对其进行了改进,对晶体海波和非晶体石蜡的熔化和凝固进行了全程监控,取得了很好的实验效果并节省了实验时间,提高了实验的准确性.     

光盘等效光栅常量和存储容量的测量

给出了CD光盘的等效径向光栅常量d⊥和切向光栅常量d∥的公式,并利用He-Ne激光器、坐标纸和分光计测量了d⊥和d∥的值. 用移测显微镜测量了光盘中信息区的最大等效半径Rmax和最小等效半径Rmin. 给出了计算光盘存储容量V的公式,该公式表明,存储容量V是d⊥,d∥,Rmax和Rmin的函数. 实验测得的d⊥和d∥和国家工业标准值的误差分别为0.1%和0.6%. 实验测得的光盘存储容量值和计算机测定值之间的误差为0.3%,分析了产生测量误差的原因.     

HL-2A装置辅助加热高压电源控制系统的设计与实现

研制了HL-2A装置LHCD和ECRH系统使用的高压电源,其电源拓扑分别为晶闸管交流调压型和星点控制型高压电源,通过高压脉冲调制器给LHCD和ECRH系统供电,采用了波头补偿、前馈和反馈相结合的控制方法,弥补了电源拓扑本身固有的瞬态特性不足和发电机输出的不稳定性,使电源输出电压输出平顶的稳定度优于1%。介绍了高压电源的主回路结构,对高压电源的控制进行了论述,同时给出了实验结果。     

甲烷水合物形成促进技术实验研究

实验研究了液态烃(环戊烷和甲基环己烷)对甲烷水合物形成条件的影响,测试结果表明液态烃降低了甲烷水合物的形成压力,并改变了形成水合物的结构。实验研究了促进剂(液态烃和表面活性剂)对水合物形成诱导时间和生长过程的影响,结果表明液态烃和表面活性剂降低了水合物形成的诱导时间,提高了水合物形成速度;而且表面活性剂提高了水合物形成过程中的耗气量,并改变了水合物形成机理。     

用于高速数据通信的梯度塑料光纤

概述了梯度塑料光纤的开发历史和现状。从应用于高速数据通信的角度 ,介绍了聚甲基丙烯酸甲酯(PMMA)、全氘化和全氟化梯度塑料光纤的损耗、带宽、稳定性和寿命。详细介绍了梯度塑料光纤的损耗光谱和损耗机制 ,介绍了制作梯度塑料光纤的界面凝胶聚合技术和两种扩散法 ,分析了梯度塑料光纤的制作方法同折射率剖面和带宽的关系 ,讨论了梯度塑料光纤的稳定性同掺杂物质的关系。同时介绍了高稳定性梯度塑料光纤的研究进展及今后的发展动向     

首批系列化国产外腔半导体激光器

就首批系列化国产外腔半导体激光器的设计,关键技术和生产等多方面进行了介绍,对一些特性参数进行了说明,给出了一些实物的图片。长期稳定性实验表明,产品的一致性和稳定性都达到了设计要求,生产流程和生产工艺相对简单,各项性能指标完全达到了国外同类产品的性能和指标。     

Study of NMR porosity for terrestrial formation in China

NMR logging is an effective method for porosity measurement. NMR-derived porosity only comes from the pore fluid and is, in principle, not affected by rock matrix. However, it is found that the difference between NMR-derived and conventional log-derived porosities is often between 2 to 6 pu, which is unacceptable, in terrestrial formation in China. In the paper, the theory of NMR porosity was reviewed. The influence factors on NMR porosity error were analyzed based on NMR core measurements. More than 30 core samples with a wide range of porosities including sandstone, limestone and artificial ceramic were chosen for the conventional and NMR porosity measurements. The current NMR data acquisition method was studied based on laboratory NMR core measurements and found to be not good for terrestrial formation. A new NMR data acquisition method suiting for terrestrial formation in China was proposed and much improved the accuracy of NMR porosity measurement. It is suggested that the analysis of core samples from different regions should be carried out before logging in order to obtain accurate NMR porosity.     

二维核磁共振数据处理与显示系统

详细介绍了我们在386微机上建立的二维NMR数据处理与分析系统,该系统采用菜单驱动方式,具有良好的用户界面,可进行标准的常规二维NMR数据处理与分析,数据处理结果可由标准设备输出或者以文件方式存储以便其它应用软件处理,该系统的建立可使通用微计算机成为有效的核磁共振数据处理站。     

多维核磁共振数据在通用计算机上的处理与三维谱的观测

本文分析、讨论了利用外部通用计算机处理核磁共振数据的方法及程序,包括数据格式转换,一维、二维、三维谱的数据处理,谱图的显示及输出,并以VAX机为例实现了三维谱的观测。文中还详细讨论了编程的原理和一些技术细节。     

JCAMP-DX 5.0标准的C++实现

JCAMP-DX是一种用于谱学数据交换的国际标准. 文中简要介绍了JCAMP-DX 5.0文件协议标准,在此基础上,提出了一种处理和管理基于JCAMP DX的核磁共振谱图数据软件方案. 该软件实现已经在我们自行开发的核磁共振数据处理系统ECNMR中获得应用.     

Entropy minimization and spectral dissimilarity curve resolution technique applied to nuclear magnetic resonance data sets

The use of entropy minimization and spectral dissimilarity is applied to three nuclear magnetic resonance (NMR) data sets. The data sets contain 2, 2, and 3 observables each. It was found that without any a priori information the sets of pure component spectra underlying the NMR spectroscopic observations could be extracted. These successful spectral resolutions suggest that a combined entropy minimization and spectral dissimilarity approach can be further developed for even larger NMR data sets containing a larger number of observables. Brief comparison to DECRA and PMF curve resolution results is also presented.     

Improvement of duty-cycle heating compensation in NMR spin relaxation experiments

To reliably measure NMR relaxation properties of macromolecules is a prerequisite for precise experiments that identify subtle variations in relaxation rates, as required for the determination of rotational diffusion anisotropy, CSA tensor determination, advanced motional modeling or entropy difference estimations. An underlying problem with current NMR relaxation measurement protocols is maintaining constant sample temperature throughout the execution of the relaxation series especially when rapid data acquisition is required. Here, it is proposed to use a combination of a heating compensation and a proton saturation sequence at the beginning of the NMR relaxation pulse scheme. This simple extension allows reproducible, robust and rapid acquisition of NMR spin relaxation data sets. The method is verified with (15)N spin relaxation measurements for human ubiquitin.     

三维NMR谱

３ＤＮＭＲ谱是２ＤＮＭＲ谱附加一个时间周期扩展而成，３ＤＮＭＲ共振峰的重叠降低，并且灵敏度与常规的２ＤＮＯＥＳＹ实验大体相当，采集３ＤＮＭＲ数据组所需时间太长，因此迄今为止，该方法的实际应用只局限于那些浓度相当高的样品。尽管目前还十分费时，但很可能３ＤＮＭＲ不久即可成为常规的ＮＭＲ技术。     

High-resolution NMR with resistive and hybrid magnets: deconvolution using a field-fluctuation signal

A method for compensating effect of field fluctuation is examined to attain high-resolution NMR spectra with resistive and hybrid magnets. In this method, time dependence of electromotive force induced for a pickup coil attached near a sample is measured synchronously with acquisition of NMR. Observed voltage across the pickup coil is converted to field fluctuation data, which is used to deconvolute NMR signals. The feasibility of the method is studied by (79)Br MAS NMR of KBr under a 30T magnetic field of a hybrid magnet. Twenty single-scan NMR signals were accumulated after the manipulation, resulting in a high-resolution NMR spectrum.     

The DOSY Toolbox: A new tool for processing PFG NMR diffusion data

The DOSY Toolbox is a free programme for processing PFG NMR diffusion data (sometimes loosely referred to as DOSY data), distributed under the GNU General Public License. NMR data from three major manufacturers can be imported and all processing is done in a user-friendly graphical user interface. The Toolbox is completely free-standing in the sense that all necessary basic processing of NMR data (e.g., Fourier transformation and phasing) is catered for within the programme, as well as a number of methods specific to DOSY data (e.g., DOSY and SCORE). The programme is written in MATLAB^® and as such can be run on any platform, but can also run independent of MATLAB^® in a free-standing compiled version for Windows, Mac, and Linux.     

Covariance NMR spectroscopy by singular value decomposition

Covariance NMR is demonstrated for homonuclear 2D NMR data collected using the hypercomplex and TPPI methods. Absorption mode 2D spectra are obtained by application of the square-root operation to the covariance matrices. The resulting spectra closely resemble the 2D Fourier transformation spectra, except that they are fully symmetric with the spectral resolution along both dimensions determined by the favorable resolution achievable along omega2. An efficient method is introduced for the calculation of the square root of the covariance spectrum by applying a singular value decomposition (SVD) directly to the mixed time-frequency domain data matrix. Applications are shown for 2D NOESY and 2QF-COSY data sets and computational benchmarks are given for data matrix dimensions typically encountered in practice. The SVD implementation makes covariance NMR amenable to routine applications.