大视场线阵CCD图像灰度均匀化

针对大视场线阵 CCD 图像不均匀现象,提出了一种基于图像像素灰度补偿的均匀化方法。首先分析并计算线形目标上不同坐标位置的微小面元在线阵CCD上产生的辐射照度,并由此推导线阵CCD面元上不同像素灰度值与中心像素灰度值之间的关系,进而建立大视场线阵CCD像面上像素的灰度补偿模型,实现大视场线阵CCD图像快速均匀化的目的。对大量线阵 CCD 采集的高速路面图像进行了处理,结果表明我们提出的方法具有较强的可行性、鲁棒性和实用性。     

光学计量用高速线阵CCD数据采集系统设计

介绍一种采用高速线阵 CCD 数据采集系统的设计过程。通过一片 MicroChip 公司的在线可编程微控制器对采集系统进行控制,并用标准 RS232 串行接口与外部进行数据通信和控制。在时序逻辑设计中,较好地解决了数据的存储、读取和点像元数据连续监测。实际应用表明该系统能满足光学干涉计量中线阵 CCD 数据采集要求。由于可以对线阵 CCD 进行单点、多点和整块数据的读取处理,因而可适应于不同周期、不同像素数目的线阵 CCD 传感器,以满足多种不同需求。     

基于FPGA的线阵CCD雨滴图像快速连续识别方法

雨滴粒子直径和速度实时测量是雨滴谱参数计算的关键,为了实时、连续得到精确、可靠的统计雨滴样本数据,采用基于高速线阵CCD的光阵排列法对雨滴速度和直径进行非接触测量,通过FPGA构造雨滴图像乒乓操作缓存单元,存储两行连续一维动态雨滴图像,发挥FPGA的并行运算能力,利用FPGA快速实现雨滴动态图像连通域检测及连通域标记算法,进而实现雨滴粒子的直径和速度检测.实验证明,该方法能自动连续测量记录雨滴数量、粒径大小和收尾速度,为雨滴谱参数计算提供可靠样本数据.     

宽带多光谱成像系统CCD响应的线性化校正方法

对多光谱成像系统CCD响应特性进行了分析,并提出使用物理阶调模型作为新的线性化校正方法。在分析了数码相机CCD响应值的线性化校正原理和方法的基础上,通过校正精度和光谱重构效果两个方面,将其与传统的多项式模型和指数模型等方法进行了比较分析。实验结果表明,经过线性化校正的各通道的线性相关性进一步增强,其中GOG模型各通道的相关系数值均接近0.996,具有最好的线性校正效果;且GOG模型校正过的RMSE和ΔE值分别降低了37%和61%。因此,采用GOG模型,可以较好地实现CCD响应值的线性化校正,提高多光谱图像获取中光照不均匀性的校正精度和效率。     

采用面阵CCD对大尺寸轴径进行高精度测量的研究

采用面阵CCD对大尺寸轴径进行高精度的拼接非接触测量,克服了单片面阵CCD测量范围小的缺点,解决了用线阵CCD拼接测量时测量带太窄又不能扩展情况下所带来的问题。面阵CCD进行图像拼接的测量方法,适用于测量128-135mm的轴径,其测量精度高达±0.01mm。     

高精度螺距自动扫描测量仪设计

介绍一种高精度螺距自动扫描测量仪的技术方案和设计思想，该仪器用高速线阵CCD捕捉螺旋线的左右边缘，用精密开式光栅测出瞄准时扫描工件台的位置值，可用于自动高速扫描测量电子管灯丝和精密丝杠螺距、齿条周节及零件长度。     

基于两步法线阵CCD标定技术研究

线阵CCD具有高采集率、宽视场的优点，一般应用在高速扫描系统中，CCD与扫描物间的相对位姿不仅影响扫描范围，而且影响其扫描精度，所以需要高精度标定CCD位姿参数。文中首先给出了线阵CCD全位姿的数学模型，通过不断对模型的变换处理，将模型参数分离为两组，分别表征CCD的视范围及物像映射关系，两者既独立又相互联系，可以独立进行标定，简化了标定过程。     

多路CCD成像不均匀性校正算法

在多路CCD成像中,每路图像之间存在不均匀性,造成这种不均匀性的因素十分复杂,常规算法常无法将所有因素都考虑,影响了校正效果.根据图像的非均匀性特征,论文提出了一种基于场景的,采用两点校正理论,利用每路图像之间的线性关系来进行校正的方法,与传统两点校正算法和多点校正算法校正结果进行对比,给出了对比实验的校正结果.这种算法不需要标准辐射图像就可对多路CCD图像进行实时校正.为多CCD成像系统校正提供了一种有效的方法.     

面阵CCD航空相机的自动对焦技术研究

航空相机在成像过程中，摄影距离随飞行平台高度发生改变，为满足摄影分辨力的要求，镜头位置要相应调整，利用面阵CCD图像经小波变换后获取的图像边缘特征和CCD交汇测距原理，实现目标距离自动测量和相机自动对焦。     

高速在线检测宽幅面彩色感光胶片质量

为降低线阵CCD拼接测量难度,提出改进的多光学系统线阵CCD拼接测量法。根据检测幅宽和精度要求,将较宽的被测幅面分成若干区域。各区域放置独立可调的光学成像系统及线阵CCD。调整各光学系统,使总成像范围覆盖整个被测幅面。几个线阵CCD同步驱动并行采集。图像信号通过PCI高速数据采集系统送入计算机。为提高判别速度,采用多尺度灰度形态学方法实现快速图像增强和缺陷判别,每秒钟可处理20幅2048像素200像素的8bit灰度图像。实验表明,可实现8个线阵CCD拼接检测幅面宽1.2m彩色感光胶片的表面质量,检测速度最高可达90m/min,可识别直径在0.1mm以上的缺陷,准确率在96%以上。     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.