南海北京大陆架典型凹陷内的封存箱及油气纵向分布

引用“封存箱”概念,研究了南海北部大陆架典型富油气凹陷的地层超压特征。根据封存箱的超压强度及顶面埋深特征,将研究区内的封存箱划分为5类。各典型凹陷的封存箱类型对油气藏的纵向分布起着重要的控制作用。封存箱类型研究有助于从压力条件方面预测油气藏勘探的有利层系及有利地区。     

攻击一种密钥流生成器的新方法

论文针对Ｊ．Ｄ．Ｇｏｌｉｃ给出的以钟控序列生成器为组合块的非线性组合生成器的统计模型，文中给出了一种基于转移概率的最大后验概率判炔新方法。这种方法从理论上讲要优于Ｊ．Ｄ．Ｇｏｌｉｃ的基于ＣＬＤ的攻击方法，模拟的结果也证明了这一点。     

Transmit/receive headcoil for optimal <Superscript>1</Superscript>H MR spectroscopy of the brain in paediatric patients at 3 T

¹H magnetic resonance (MR) spectroscopy is a useful tool to obtain metabolic information from the brain in paediatric patients. To detect signals of metabolites at low concentrations or from small volumes, the signal-to-noise ratio (SNR) has to be optimized. The SNR can be increased by going to higher field strengths. However, this leads to higher spectral bandwidths, which increases the chemical shift artefact. Here we present a transmit/receive headcoil which is adapted to the dimensions of the paediatric head and enables PRESS localization with high radio-frequency (RF) bandwidths that minimize the chemical shift displacement to only 5%. In addition, since the pulse lengths are shorter with higher RF bandwidths, the echo time can be reduced to 10 ms improving SNR as well.Parts of this work have been presented at the European Society for Magnetic Resonance in Medicine and Biology in Rotterdam in 2003     

An investigation on technologies to fabricate microcoils for miniaturized actuator systems

Within the framework of the Collaborate Research Center Design and Fabrication of Active Microsystems (Sonderforschungsbereich 516), one aspect is the development of fabrication technology for driving coil systems to be applied to in electromagnetic microactuators. The two key focus areas are the fabrication of high aspect ratio conductors and insulating them by applying planarizing polymer material. The research activities included the development of technologies like for UV depth lithography, electroplating through lithographic masks (galvanoforming), as well as embedding in and planarization by insulation material. Combining these technologies allows to create high aspect ratio integrated multi-layer coils with integrated magnetic flux guiding structures. The materials applied were copper as a conductor, NiFe for magnetic cores and the negative tone resists SU-8 (MicroChem Corp.) as well as BCB (DOW Chemical) for insulation and embedding purposes. For electroplating molds, the DNQ/Novolak type photoresists AZ4562 and AZ9260 (Clariant) were utilized. The established technologies were integrated into process flows for fabricating thick and high aspect ratio planar and helical coils for electromagnetic linear actuators.This work was sponsored in part by the German Research Foundation as part of their support for the Collaborative Research Center Design and Fabrication of Active Microsystems.     

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用测井资料计算泥浆侵入深度主要是基于电阻率径向分布特征进行的,传统的方法主要有图版法、经验公式法。用测井资料计算泥浆侵入油气层深度是十分有效而直接的手段,用其间接地评价钻井泥浆污染油(气)层的程度则是一项经济可行的新技术。文章在分析比较了传统的泥浆侵入校正方法的基础上,经过理论推导和应用介绍了一种直接利用深、中、浅电阻率组合测井资料计算泥浆侵入深度的新方法。通过对研究工区10多口井的实际资料进行处理,泥浆侵入深度的解释结果与测试评价基本相符,应用表明,该方法不但可以求出钻井泥浆侵入深度,还可求出地层真电阻率,它优于传统的方法,对低侵、高侵和无侵三种情况都实用,不失为一种计算泥浆侵入油气层深度的新方法。     

掺铕稀土配合物的光学树脂荧光光谱研究

报道了将多种稀土铕配合物复合于苯乙烯(ST)／甲基丙烯酸(HMA)的共聚体系,研究了含稀土配合物透明光学树脂的光学性能。发现其具有发光效率高,光谱呈现尖锐的线状谱带及相对于纯稀土配合物粉末来说掺有稀土配合物的光学树脂的发射产生光谱红移等特点。特别是用电子云重排效应(当中心稀土离子与不同配体结合时,其相同的J能级间的跃迁谱带位置略有移动的现象)解释了掺有稀土配合物的光学树脂发射光谱红移现象。并推断出在含稀土配合物复合于光学树脂后。稀土中心离子和配位原子间距离有所减小。     

稳定的Born近似叠前深度偏移方法

本文针对HuangLJ等（1999）在“扩展的局部Born Fourier偏移方法”一文中提出的散射波场计算公式在强横向变速介质的不稳定性,提出了一种新的Born近似散射场计算公式,并把该公式应用于波场递归于推过程中,进而得到一种稳定的Born近似叠前深度偏移方法。与Split-Step Fourier方法和Phase-Screen方法相比,本方法对Marmousi模型炮集数据的偏移处理取得了良好的结果。本文提出了的Born近似散射场计算公式可扩大Born近似的应用范围,对散射波扬的计算有一定的理论意义应用价值。     

固定场源建场测深仪原理

CJY16固定场源建场法仪器用于非地震勘探方法勘查地质结构,它综合地震仪器与电法仪的特点,由多道有线遥测数据采集系统与强电流发射系统组成,是一种多功能电法勘探仪器。连接不同传感器,可分别用于建场测深法、激发极化法、频率测深、震电法、电震法等。CJY16在新疆探区生产中,使用效果良好,取得了较好的经济效益。     

Mobile Robot Navigation Using Sonar and Range Measurements from Uncalibrated Cameras

A novel, simple and efficient method for vision based range measurements with uncalibrated cameras is presented. Required parameters are the image size, the relative distance between two different image frames of the same scene and the field of view of the camera(s). Range measurements acquired using ultrasonic sensors and a vision system have been used to navigate a mobile robot around known colored obstacles in an indoor environment. Both sonar sensors and cameras are activated and they operate simultaneously in parallel to obtain range measurements from common search areas located in the front of the mobile robot. Experimental results using a parallel stereoscopic, rotated and monocular vision system with uncalibrated cameras confirm that the maximum computational error (as well as the normalized root mean square error) of range measurements using the vision system for obstacles lying at a distance of 27–800 cm from the robot, is smaller compared to other similar, even more advanced and state-of-the-art existing approaches, reported in Rajagopalan (IEEE Trans. Pattern Anal. Mach. Intell., 28(11): 1521–1525, 2004), Mudenagudi and Chaudhuri (Proceedings of IEEE International Conference on Computer Vision, 1: 483–488, 1999), Umeda and Takahashi (Proceedings of IEEE ICRA, pp. 3215–3220, April 2000), Jiang and Weymouth (Proceedings of IEEE CVPR, pp. 250–255, June 1989), Lai, Fu, and Chang (IEEE Trans. Pattern Anal. Mach. Intell., 14(4):405–411, 1992), Malis and Rives (Proceedings of IEEE ICRA, pp. 1056–1061, 2003), Derrouich, Izumida, and Shiiya (IEEE Annual Conference on IECON, 3: 2191–2196, Nov. 2002).     

基于规范化谱主成份分析的微操作深度信息提取

针对微操作工具在测试窗口内（X-Y平面）大范围移动时，采集到的模糊图像差异较大的问题，提出了一种新的不变量特征提取方法――规范化谱图像，将其应用于深度估计可提高系统的鲁棒性。同时，利用主成份分析方法可降低数据的维数并抑制噪声的影响，使得系统的实时性和精度得到较大改善。实验结果验证了上述方法的有效性。