摘要:Evaluating students' examination records by using fuzzy comprehensive evaluation method. Through the analysis of empirical example, it shows that it is just an objective, effective evaluation method, which is easy to calculate and operate as well.%运用模糊综合评判法对学生考试成绩进行了评价,通过实例分析表明,这只是一种客观、有效、计算方便,易于操作的评价方法.
摘要:根据光电望远镜水平式机架的结构特点,本文给出了水平式机架的结构设计中要关注的要素,两轴垂直度的检测方法,在球面三角坐标系计算出轴系误差对水平式望远镜指向精度的影响.%According to the features of the tracking mount in the optoclcctronic telescope, we give the basic principles for designing the level mount. In spherical trigonometry coordinate, the influences of the shafting errors on the pointing precision of the telescope are discussed in detail.
摘要:This paper introduces the control system design of temperature, we achieve the PID control in upper computer using the language of Lab VIEW, the fuzzy PID parameters are sent to microcomputer through serial port, as long as microcomputer receives the parameters it exports PWM waveform so as to control the power of the heating device. This design adopts fuzzy PID control which improves the system response degrees and greatly improves the precision of the system. We can conveniently input control variables with the interface designed by Lab VIEW, which can display the temperature of environment real-time and makes the system control flexible, principle simple and application wide.%本文设计了温度控制系统,采用Labview语言设计的上位机PID控制,模糊PID的参数通过串口传输给下位机,下位机接收的PID参数控制输出PWM波,从而控制加热装置的功率.采用模糊PID控制,改善系统的响应度并且大大的提高系统的精度.用Labview设计的上位机界面可以方便的输入控制变量,实时显示环境温度值,使得本系统控制灵活、原理简单、应用广泛.
摘要:为了减少微电机临界转速对电机的危害,对微电机转子临界转速计算方法进行了研究.以分析法为基础设计了适合各种类型的微电机转子临界转速的计算程序,介绍了计算程序考虑各种主要因素.以轴承支承类型设计了两种转子支承夹具,对样品进行了频率响应测试.实验测量结果显示,两种支承计算和测试数据误差在10%以内.由此可见,该计算程序可以计算各种类型微型电机转子,对工程实践具有重要的指导意义.%In order to reduce the damage of critical speed for micromotor, make research on the calculation method of critical speed for micromotor. Based on analytic method, the calculation program is designed, which is suitable for all kinds of rotors. The main factors are introduced for calculation program. Two kinds of fixture were designed based on the kinds of bearing. The frequency response test for samples is done. The test result shows that the datum error is below 10 percent between calculation and test for two kinds of supports. The calculation program can be suitable for all kinds of rotors of micromotor. It is helpful to engineering practice.
摘要:采用脉冲沉积(PLD)法在石英玻璃衬底上制备了Zn1-xCdxO薄膜,X射线衍射仪(XRD)结果表明,所制备的Zn1xCdxO薄膜具有与ZnO同样的六角纤锌矿结构,且薄膜具有沿着(002)晶面择优取向生长特征,随着Cd掺杂浓度(x)的增加,衍射峰(002)向小角度方向移动,晶格常数增加.光致发光光谱表明Zn1-xCdxO薄膜随着Cd的掺杂浓度的增加使光学带隙逐渐变窄了,且控制掺入量就可以实现ZnO薄膜禁带宽度在一定范围内连续可调.%Zn1_xCdxO thin films were prepared on quartz glass substrates by Pulsed-Laser Deposition(PLD) method. Zn1-xCdxO films showed a hexagonal wurtzite structure and c-axis orientation as observed by XRD. The peak positi on of the (002) plane shifted to the low angle value with the increase of Cd doping . All the samples show two distinct emissions: a peak in the UV region and a broad deep level peak in visible light region, the violet emission peak has a red shift to region of lower photon energy as the concentrati on of the Cd increases. It was practicable to reduce optical bandgap of the thin films by Cd-doped ZnO.
摘要:从生孢噬纤维菌中分离完整的基因组DNA,经过PstⅠ限制性内切酶部分酶切后,在T4DNA连接酶作用下,将酶切的片段连接到载体pUC18的PstⅠ位点中,然后转化到E.coli DH5α中,构建了基因组文库,经过筛选获得4.2×103个重组子.经过刚果红平板筛选获得了含有CMCase基因片段的重组子,在E.coli中进行表达,E.coli在37℃培养25~30h,培养液中CMCase活力达到22.8U/mL.%In this study, the genomic library of Sporocytophaga sp. JL-01 was constructed.The genom DNA isolated from Sporocytophaga was partially digested with PstI, and then the fragments were ligated to pUC18 vector (PstI) and transformed into E.coli DH5α. 4.2xl03 recombinants were obtained by means of screening. Recombinant containing a DNA fragment of CMC cellulose (CMCase) achieved by making use of Congo red plate. The CMCase gene was expressed in E. Coli. When the E. Coli was cultivated at 37℃ for 25~30 hours, the cellulase activity reached 22.8U/mL.
摘要:According to the complexity, variety and nonlinear mode of UAV systems faults, a combined method based on expert system and BP neural network is proposed for the diagnosis. The framework and the working process of the expert system based on BP neural network are described respectively. Then the telemetry and telecontrol system of UAV is taken as an example of the diagnosis. Lastly, the implementation of the system software is briefly given. The results show that the new expert system can diagnose UAV systems effectively and have a good application prospect.%针对无人机系统故障复杂度高、非线性强、故障现象多种多样等特点,提出将专家系统与BP神经网络相结合应用于无人机系统的故障诊断中.给出了该诊断系统的具体结构组成和诊断流程,并以无人机的遥测遥控系统为例进行了实例诊断,最后给出了系统软件的实现方式.结果表明,该系统能有效地对无人机系统进行快速准确地诊断,具有很好的应用前景.
摘要:In the process of missile quality evaluation, the determination of various index weights is a crucial annulus, and also is the key research in quality evaluation. Index weight calculation is reasonable or not will directly affect the accuracy of the assessment results. Principle of least squares is proposed based on a combination weighting method, the use of guidelines for the optimal portfolio weights give the best combination of a linear expression. And the principle of general coherence and TOPSIS method give the best answer to optimal combination weight coefficient. This combing-weight method is proved to be efficient by to the ex post checking criteria. And it realizes the dynamic assessment of the missile quality based on the method of multiple attribute to decision making.%在导弹质量评估过程中,确定各个指标的权值是十分关键的一环,也是质量评估研究的重点.指标权重计算的合理与否将会直接影响评估结果的准确性.基于最小二乘原理提出了一种组合赋权方法,利用最优组合准则给出了最佳组合权重的线性表达形式,并用广义一致性准则和TOPSIS法来求解最优组合权重系数.最优权系数组合赋权法的事后检验准则验证了该方法的有效性,而基于该方法的组合赋权多属性决策,则实现了导弹质量的动态评估.
摘要:As an important branch of modern information retrieval technology, full-text search is not only an important tool for dealing with unstructured data, but also one of the mainstream technology of search engines.This paper starts from studying the working principles and process of search engine model in depth, and talks about Lucene's architecture with privious knowledge and how to use Lucene.Finally, mainly for some basic algorithms of Chinese segmentation and relevance ranking, we set up a Lucene-based full-text document retrieval system by applying these technologies.%全文检索作为现代信息检索技术的一个重要分支,不仅是处理非结构化数据的重要工具,也是搜索引擎的主流技术之一.本文首先从全文搜索引擎模型入手,对其基本工作原理和流程进行深入研究,并结合这些知识研究开源检索引擎包Lucene的架构原理及其开发应用方法.然后介绍中文分词和基本算法及Lucene的相关技术.
摘要:本文探讨并解决了基于ArcGIS构建校园三维漫游场景时的关键技术和问题,其中包括碰撞检测算法、漫游算法、空间测量算法,模型的优化,以及模型导入时的相关问题.在此基础上,实现了长春理工大学南区的三维漫游系统.%The paper explores and builds solutions to key technologies and issues of the campus 3D roaming scene based on ArcGIS, including collision detection algorithm, roaming algorithm, space measurement algorithm, the model optimization, as well as issues related to import models, on that basis, the paper completes a three-dimensional roaming system of the South of Changchun University of Science and Technology.
摘要:For a class of nonlinear min-max problems, because aggregate function method is simple and easy to implement, it has always been more popular smooth processing technology, However, it is not easy to choose a suitable penalty factor. By employing the feasibility-based rule, this paper proposes the hybrid Hook-jeveese search method and particle swarm optimization with a feasibility-based rule for nonlinear min-max problems. Compared with the aggregate function, feasible basis rule does not require additional parameters, and it dictates particles to the feasible domain fly quickly. Simulation and comparisons based on two well-known problems demonstrate the effectiveness, efficiency and robustness on initial populations of the proposed method. Moreover, the new method obtains some solutions better than those previously reported in the literature.%对于一类非线性极大极小问题,由于凝聚函数法简单且易实施,所以一直是较流行的光滑处理技术,然而选择一个合适的惩罚因子不是一件容易的事.本文通过引入Hook-jeveese搜索法和可行基规则,提出一个求解非线性极大极小问题的新的混合算法-Hook-jeveese搜索法和与可行基规则相结合粒子群算法的混合算法.与凝聚函数法相比,可行基规则不需要额外的参数,且指引粒子迅速飞向可行域.利用两个典型实例问题进行计算比较,计算结果表明了新算法是求解非线性极大极小问题的一个高效的算法,而且获得了一些比以往文献精度更好的解.
摘要:本文主要研究了基于小波变换中多分辨分析理论的图像压缩算法,即低频信息保留压缩算法和小波包最佳基算法.用Matlab编程实现,并且对实验结果进行了分析和比较.%In this paper, we concentrate on image coding method based on Multi-resolution Analysis of wavelet transformation, which are the image compression method of saving low frequency information and optimal group of wavelet packet algorithm. We compare and analyse the result of Matlab program.
摘要:Much attention has been given to polarization holography for the important role in high-density information storage. Polarization holographic gratings were classified and mathematically described by Jones matrix. The experimental results of S-S and S-P polarization holographic recording in spirooxazine doped polymer films were presented under UV light irradiation. The phenomenological equation curves, taking photo-isomerization, photo-orientation and the resistance effect of polymer matrix into account, agreed well with the experimental results. It was pointed out that the grating growth dynamics is controlled by the competition between orientation and isomerization. The works provided a theory basis for the application of the material.%偏振全息因其在高密度信息存储中的重要作用而引起人们的广泛关注.本论文讨论了偏振全息光栅的种类,并利用琼斯矩阵进行了数学描述.论文重点研究了螺噁嗪掺杂的聚甲基丙烯酸甲酯S-S和S-P偏振全息动力学过程.考虑到光异构、光取向以及聚合物基质的位阻效应,建立了光栅动力学的唯象模型,通过调整拟合参数,获得的理论曲线与实验结果符合得很好,表明异构光栅与取向光栅的生长过程存在竞争.研究结果为该材料的实用化提供了理论依据.
摘要:AlGaN/GaN high electron mobility transistors (HEMTs) were grown on un-pattemed, patterned without mask, and patterned with mask Si (111) substrates by metal organic chemical vapor deposition (MOCVD) . The patterns on the Si substrates were fabricated by SiO2 masks and wet etching. Double A1N interlayers grown at high temperature were employed to relax the tensile stress induced by the large mismatches in the lattice constants and the thermal expansion coefficients. Growth characteristics of AlGaN/GaN HEMTs were discussed and analyzed. Before achieving optimized growth conditions, more cracking lines were observed on patterns along the [1-100] orientation than along the [11-20] orientation, resulted from more stable GaN (1-100) facets than GaN (11-20) facets. It is suggested that long patterns should be made along the [11-20] orientation. Micro-Raman measurements showed that Raman shifts at the concave corners are bigger than those at the convex corners, indicating the presence of the larger stress at the concave comers.%双AIN插入层方法被用来在Si (111)图形衬底上进行AlGaN/GaN高迁移率晶体管(HEMT)的金属有机物化学气相沉积(MOCVD)外延生长.Si图形衬底采用SiO2掩膜和漫法腐蚀(无掩膜)两种方法进行制备.高温生长双AIN插入层用来释放GaN外延层和Si衬底之间由于晶格失配和热失配而产生的张应力.AlGaN/GaN HEMT的生长特性被讨论和分析.在使用优化的双AIN插入层之前,可以在图形[1-100]方向观察到比[11-20]方向更多的由于应力而引起的裂纹.这是由于GaN在(1-100)面比(11-20)更稳定.建议在图形设计中,长边应沿着[11-20]方向进行制备.拉曼测试显示在图形凹角处比凸角处有更大的拉曼频移,证明在图形凹角处有更大的张应力.
摘要:To test the accuracy of radial rotating shaft, rotating shaft developed a radial accuracy of the detection devie- es.Coaxial with the axis of the device to install the main grating as the base, through the instructions grating direction coaxial with the main grating installation, place the two on the path to two optical receiving system receives the signal, the phase measurement using the phase difference between the two signals, the rotation axis Radial runout of the Department of converting the phase difference between the two optical signals, after conversion, given the precision rotating shaft runout.Analysis of the factors that affect the test results, the device has been successfully applied in the precision of detection of tating shaft, the device's measurement error is less than 0.2μm.Test results show that the device has a simple structure, expedient alignment, and high precision measurement.%为了检测旋转轴系径向跳动的精度,研制了一种旋转轴系径向跳动精度的检测装置.该装置以与主轴同轴安装的主光栅为基准,通过指示光栅与主光栅同轴安装,对径放置两接收系统接收到两光电信号,.利用相位计测出两信号的相位差,把旋转轴系的径向跳动量转换为两光电信号的相位差,经过换算,给出旋转轴系的径向跳动精度.分析了影响检测结果的因素,该装置已成功应用在旋转轴系的精度检测中,装置的测量误差不大于0.2μm.检测结果表明该装置具有结构简单,装调方便,测量精度高等特点.
摘要:以非抽样Contourlet变换(NSCT)为基础,提出了一种新的抗攻击的鲁棒数字水印算法.使用混沌置乱和混沌加密处理水印信息,增强数字水印的安全性,同时提升了水印抗剪切等攻击的能力.将水印按照规则嵌入NSCT的低频子带,水印的不可见性和鲁棒性得到了较好的平衡.实验结果表明,本文提出的方法具有较好的安全性、鲁棒性和不可见性,能够有效地抵抗JPEG压缩、滤波、剪切等攻击.%A new robustness image watermarking algorithm based on chaotic encryption and nonsubsampled contourlet transform (NSCT) is proposed. Scrambling and encrypting the watermarking information using chaos to enhance the security of digital watermarking, while the anti-attack ability of shear and other attacks is improved. The watermarking embedded in low-frequency subband of NSCT by the rules, and the invisibility and robustness of watermarking embedded was good balance. The experimental results show that the algorithm proposed in this paper has good security, robustness and invisibility, and it can effectively resist the JPEG compression, filtering, cropping and other attacks.
摘要:In order to achieve server side communicating with client side on its own initiative on HTTP application circumstance, many server push technologies arise. However, there are many defects in these technologies. HTML5 brings several new features on communications. In order to validate the similarities and differences between the new features of HTML5 and traditional server push technologies, compares will be made with analysis on transmission messages by constructing the same client and server environment to capture these transmission messages. Empirical results show that the communication features presented by HTML5 have similar realization mechanism with traditional streaming way, and better performances than traditional long pooling way.%为了实现在HTTP应用下服务器能够主动和客户端通信,产生很多服务器推送技术,然而这些技术在应用过程都存在着不同方面的缺陷,HTML5提出了一些在通信方面的新特性,为了验证这些特性和传统的服务器推送之间的异同,通过构建相同的客户端服务器环境,抓取和分析在服务器和客户端传输的报文的形式来量化比较它们之间的区别.通过实验可以发现,HTML5这些通信方面的新特性在实现方式上和传统的流方式比较相似,比传统的轮询方式有着出色的性能上提升.
摘要:设X是光滑的n维射影簇(n≥2),ε是X上秩为r=n-k的丰富向量丛(k≥-1).则X是射影空间pn,ε是线丛Opn(1)的直和,当且仅当A(ε,KX)=k+1.%Let X be a smooth projective variety of dimension n(n≥2) and ε is an ample vector bundle with rank r=n - k(k≥- 1) over X. Then X is a projective space P11 and ε is a direct sum of line bundles 0pn(1) if and only if Λ(ε,Kx)=k+l.
摘要:对微位移传感器非线性误差的修正存在诸多问题,该误差是提高微位移传感器测量精度的“瓶颈”.本文介绍了用神经网络校正传感器系统非线性误差的原理和方法,提出了基于BP神经网络传感器非线性误差校正对测量数据进行修正.修正结果表明该方法是准确有效的,而且网络结构简单,准确度高.%There are many problems about errors correction of micro-displacement sensor, which are so difficulty that we could not be skill in improving the precise of micro-displacement sensor . The principle and the methods for correcting the nonlinear errors of the sensor system with a neural network are introduced . Nonlinear errors correction of sensors based on BP neural network, which include its model, algorithm and realized techniques are presented.The results of computer simulations illustrate that not only the inverse modeling based on BP neural network can compensate the effect of the nonlinearity, but also the construction of the neural network is simple and the precision is good..
摘要:在噪声监测点位加法优化确定最少支撑点位的基础上,提出了最小失真点位的概念,并给出了确定最小失真点位的基本算法.经实践验证,本文所采用的方法,具有一定科学性和可行性.在实际工作中,既减少了噪声监测点位的数量,又保证了监测数据的失真度最小,是在空间上对噪声等效声级值曲面进行优化,具有广泛的普适性和科学性.%On the basis of utilizing the addition to optimize the minimum support point on the noise monitoring points,the article put forwards the concept of minimum distortion point location, and gave the basic algorithm to determine theminimum distortion point location. It was verified by practice, the method used in this article had a certain scientificityand feasibility. It reduced the number of the monitoring points, while it also guaranteed a minimum distortion, and itwas used to compare and optimize the noise equivalent sound level value surface in space, which had a universality andscientificity.
摘要:In the paper, an interpolation method is used according the standard to generate enough samples, and improved LM algorithm used to train the model to accelerate convergence and raise generalization ability. The model can comprehensively evaluate the water qualities of source sections in East Route of South-to-North Water Diversion Project through 8 years of continuous water quality monitoring data. A Hopfield neural network models of the data is also established to make an objective, comprehensive water environment quality, and suggestions for improvement are given according to the specific standard index gives.%采用标准中内插值的方法生成足够多的样本,用LM改进算法进行训练,模型收敛加速,泛化能力提高,用该网络对南水北调东线源头的断面连续8年的水质数据进行综合评价.建立离散Hopfield网络模型对该数据进行评价,得出客观、全面的水环境质量状况,并针对具体超标的指标给出了改善建议.
摘要:水库富营养化是指营养物质(通常以氮、磷为主,还包括有机化学物)含量过高,导致水库里藻类等厌氧植物和细菌疯长,使水体缺氧,水库里面其他植物动物因缺少氧气和阳光大量死亡.本文通过太平池水库多年的水质监测资料分析评价,探讨水库发生富营养化的成因,得出氮、磷、有机化合物等指标超标以及外部污染源的汇入等因素是导致太平池水库产生富营养化的主要来源,提出了切实可行的富营养化治理措施和建议,为水利、环保等部门提供科学的依据.%The reservoir eutrophication is that the nutrient (nitrogen, phosphorus and organic compounds) is excessive, which results anaerobic plants (algae) and bacteria soaring in the reservoir, so the water is short of oxygen. The other plants and animals in the reservoir decease because of lacking of the oxygen and sunlight. Based on years of water quality monitoring data, the cause of Taipingchi Reservouir eutrophication is discussed. The results show that the reason include the water temperature is too high, nitrogen and phosphorus are excessive, and the external pollution sources import. Suggestions and measures are given to control water eutrophication, which provide a scientific basis for the water conservancy and environmental protection.
摘要:1.3和1.5μm波长低密度自组织双层量子点被期望首先用在在单个光子光纤传输中,这种结构是基于由一薄层GaAs隔离的双层InAs量子点实现的,由于应变场的存在,第一层量子点为第二层量子点提供了一个成核区,低温生长的双层InAs量子点发光主要来自于顶层量子点,顶层量子点发光波长会向长波长移动.在本论文中,利用低密度InAs量子点作为获得长波长双层InAs的种子层,实验制备的双层InAs量子点,波长约为1.4μm.%1.3 or 1.55 μm low density self-assembled bilayrer quantum dots (QDs) on GaAs has been focused first on as single-photon emitters. The structure was based on two closely spaced QD layers separated by a thin GaAs spacer layer. The first layer of QDs created a strain field which extends through the spacer layer, and provided nude- ation sites for the second layer QDs. By growing the second layer of QDs at a low growth temperature, a long wavelength emission can be achieved. In this work, we preliminarily show that, by using a low-density InAs QD layer as a template, it is the foundation to obtain long-wavelength low-density InAs bilayer quantum dots (BQDs), benefiting from the low density of the QDs, 1.4μm emission from BQDs in the long wavelength was demonstrated.
摘要:Heavy metals including Ba, Pb, As, Cr, Co, Ni, Cu, as and Zn etc in the lake sediments at Nan lake in Changchun have been detected by pressed powder pellets using EDXRF. Major problem that be studied is elements of measurement conditions, background selection and line correction. Test results meet the standards. The detection limit and accuracy of the method meet the analysis requires of geochemical samples for environmental monitoring. Samples was tested by using standard material of GWB07305 stream sediment component analysis, all tested samples' RSD<9% except Cr<15%. The results show that the precision and accuracy of EDXRF meet the testing requirements for stream sediment.%采用粉末样品压片制样,用能量色散X射线荧光光谱仪对长春南湖湖底沉积物中Ba、Pb、As、Cr、Co、Ni、Cu、Zn多种元素进行测定.重点研究了元素的测定条件、背景选择和谱线校正问题.经检验,结果符合标准,方法的检出限和精确度能够满足环境检测化探试样的分析要求.用GWB07305水系沉淀物成分分析标准物质进行测试,精密度(RSD)除Cr< 15%外,其余元素均<9%.结果表明,EDXRF光谱法的精密度和准确度能够满足水系沉积物检测要求.
摘要:系统焦距是光学系统中一项重要的技术指标,通常采用光栅二次调焦或摩尔条纹同向法进行测量,其过程繁琐、周期长.本文提出基于玻罗板图像处理技术的焦距测量方法,CCD获取平行光管的玻罗板的分划线图像,采用放大率法结合分划线亚像素的定位技术检测系统焦距,普通算法的精度只能达到像素级,本文采用投影法和二项式曲线拟合相结合的算法,使定位精度达到了亚像素级.试验结果表明该方法具有标校过程简单、快速,标校精度高等优点,其标定误差小于0.5mm.%Focus is an important tcchnical indicators in the optical system, it is usually measured hy the measurement of the second focusing lens measuring focal length with grating and idcntical direction Moire fringe, and the process of messurement is usually fussy and costs a long time.The paper puts forward a focus detection measurement of optical system based on Porro board image processing technology, this methord gets images of Porro board by CCD, detects system focus using the method of magnification and subpixel of reticle orientation Technology. The orientation precision of general algorithms can only achieve pixel level, the orientation precision of the algorithm adopted by the paper, using projective geometry and binomial curve fitting, has reached subpixel level.The experiment results indicate that this method has advantages of simplicity, speed and high precision, the calibration error is less than 0.5mm.
摘要:随着超快激光器向高功率、高脉冲能量发展,半导体可饱和吸收反射镜(SESAM)的损伤机制和高阈值SESAM的研究必不可少,本文用热像仪对高功率超快激光器中工作的SESAM进行热成像,得出不同腔型、不同功率超快激光器中工作的SESAM的热成像图.用平均功率约为83W,单脉冲能量约为24μJ,重复频率为3.4MHz的高功率超快激光器发出的激光脉冲作用于SESAM时,观察到了SESAM表面的热损伤,并用干涉测量法对其表面进行面形分析.%With the development of ultrafast laser to high power and high pulse energy, it is necessary to study damage mechanism of semiconductor saturable absorber mirror (SESAM) and high threshold SESAM. Damage mechanism of SESAM in high power ultrafast laser is theoretically analyzed and experimentally observed in this paper. The damage mechanism on surface of SESAM is studied by heat imaging of SESAM in working high power ultrafast laser with thermal imager and the SESAM surface damaged by high power femtosecond laser pulses is also analyzed. Both heat damage of SESAM and the influential factors are studied in this paper.
摘要:由于空中目标测量图像灰度往往不均衡,采用传统彩虹码进行伪彩色变换时往往造成色彩分布极不均匀,整幅图像仅仅显示一、二种颜色.基于此问题,本文根据测量图像灰度分布特性,利用自适应阈值理论,对传统彩虹编码进行改造,提出了一种基于测量图像的自适应伪彩色编码方法.实验结果表明:变换后得到的伪彩色色彩丰富,完整地覆盖了全部有效灰度范围,且算法具有较好的自适应性.%Aiming at the gray intensity of objective measurement image is not always balanced, and it often leads to uneven color distribution by pseudo-color coding base on rainbow-code, and the whole image shows only one or two color, based on this problem, we measure the image intensity distribution in accordance with adaptive threshold model code to transform the traditional rainbow, an adapative pseudo-color image coding method based on measurement image is proposed.Experimental the results show that: the pseudo-color transformation is colorful and it can cover the effective intensity range completely adaptabilit of the algorithm is excellent.
摘要:It is important to study the capillary burst valve with a hydrophilic flat cover used in a microfluidc system. The burst pressure of capillary burst valve is obtained by the simulation using the surface evolver algorithm. When the passive valve is limited by a flat cover with good hydrophilicity, it is necessary to set some liquid contact line to pass through the entrance of expansion section for the simulation. The microvalves composed of PDMS microchannels and a glass cover were made and tested. And the phenomenon that the contact line flow through the expansion was observed successfully. The obtained simulate data has agreement with experiment data based on a rotating platform. The effect of different expansion sections and the expansion angle were discussed.%具有亲水盖板的毛细被动阀在聚合物微流体芯片的设计中有着重要意义.本文使用Surface Evolver软件,实现了被动阀临界压力的计算.指出由于盖板具有很好的亲水性,要实现仿真收敛,对侧壁的接触线要设置为允许有部分接触线流过扩张段入口.使用PDMS微通道和玻璃平板制作了微流体芯片,观察到了接触线流到扩展段侧壁的现象.进行了转台实验,实验和仿真结果相符.讨论了扩张段个数和侧壁扩张角对临界压力的影响.
摘要:基于电流变技术在盘式离合器上的应用,提出通过离合器结构优化来提高其传输性能.文章首先通过理论分析,发现盘式离合器采用平盘一波纹盘结构比双平盘结构输出扭矩要有明显提高,并通过实验结果论证了理论分析的正确性.实验表明,采用平盘一波纹盘结构的盘式离合器输出扭矩比双平盘的要提高1.5~2.5倍,甚至更高,这一结果与波纹头数无关而与波纹幅值有关,且通过提高电场强度及增大转速差能提高输出扭矩.%Based on the electrorheological technology application in disc clutch, proposed through the clutch structure optimization to improve the transmission performance. Firstly, through theoretical analysis, found the disc clutch adopts flat-ripple disc structure than the double flat disc structure output torque to be improved, and the experimental results prove the correctness of the theoretical analysis. Experimental results show that, the clutch output torque using flat-ripple disc structure than double flat disc structure to increase 1.5 ~ 2.5 times, or even higher, This result has nothing to do with the ripple number, but related with the ripple amplitude, and it can improve the output torque by increasng the electric field intensity and the rotational speed difference.