ψ(3770)精细扫描数据积分亮度的测量

工作在北京正负电子对撞机(BEPC)上的北京谱议(BES),于2003年12月在质心系能量从3.660到3.897 GeV区间内67个能量点上收集了数据,我们测量了此67个能量点数据样本的积分亮度.数据样本对应的总的积分亮度为(5550.96±13.56±108.24)nb-1.     

自适应多采样扫描转换算法

随着片元着色器的可编程能力不断提高和新型图元的出现,扫描转换必须加强多采样时的处理能力.经典的边方程扫描转换算法便于实现多采样,但采样点测试的计算量大并且存在冗余测试,为此提出一种自适应多采样扫描转换算法.该算法的多采样集中在"边界片元",并结合点采样和区域采样技术根据自适应细分规则细分边界片元进行采样点的测试;避免了边方程算法中进行采样点测试时的乘法运算,减少了采样点的冗余测试,提高了多采样时扫描转换的性能.实验结果表明,文中算法在较小代价下达到或接近有相同采样点数的超采样反走样能力.     

机械密封微小形变图像测量系统像素当量的标定

在机械密封数字散斑微小形变图像测量系统中,像素当量的标定工作介于图像采集和处理之间;基于VC++2008 MFC开发了图像像素当量标定系统;系统包含了抓图、图像的阈值分割、形态学处理、扫描检测标定块的边缘及线性回归分析功能;介绍了抓图软件的开发过程;编制了形态学的腐蚀、膨胀及开/闭运算的函数,使用这些函数实现了图像的形态学处理;在形态学处理后显示图像的基础上框选包含标定块的理想区域使用扫描法获取边缘信息;对获取的边缘信息进行线性回归分析拟合出标定块的上下边缘的直线方程,根据拟合出的方程求出两条直线间的距离,最后用标定块的实际宽度除以直线间的距离即为像素当量;运行结果表明获得了亚像素级别的像素当量,保证了后期使用DSCM方法计算微小形变的精度.     

紧凑型边界扫描技术的功能与现状

芯片一体化进程的加剧以及对功耗控制的关注日益增加,边界扫描技术面临新的挑战,这些挑战来源于调试、应用、测试等方面,紧凑型边界扫描技术对此提出了有效的解决方法;以IEEE1149.7标准以及国内外文献报道为依据,对精简引脚与增强功能边界扫描技术的测试规范进行系统的分析,重点对该技术的新功能、新特性和新应用进行详细介绍;针对符合IEEE1149.1标准的测试系统与被测系统如何升级以实现IEEE1149.7标准新功能的问题提出了相应的建议;最后总结了该技术的发展方向和应用前景。     

实现多无线接入点网络连接模型的研究

本文提出一种负载均衡模型,此模型不仅考虑AP的信号强度,而且要考虑现有AP已接入无线工作站的数量还有连接质量因素。除此之外,还讨论了实现此模型的无线协议的扩充。     

Cation Effect on the Binary and Ternary Phase Behaviors of Double-Tailed Methanesulfonate Amphiphiles

A series of symmetrical dialkyl methanesulfonate amphiphiles [DiC _n CHSO ₃ ] _m M (n = 6, 7, 8) with different counter cations (M^m+ = H⁺, Li⁺, Na⁺, K⁺, Cu²⁺, Zn²⁺, Mg²⁺, Ca²⁺, Sc³⁺) were synthesized in five steps. Their solubility and critical micelle concentration (CMC) in water were determined highlighting a huge effect of the chain length and the nature of the cation. The hydrophilic–lipophilic balance of the surfactants were assessed with the phase inversion temperature (PIT)-slope method based on the deviation from the PIT of the reference C₁₀E₄/n-octane/0.01 M NaCl_(aq) emulsion through addition of increasing amounts of the dialkyl methanesulfonates. The hydrophilicity of the surfactants was thus ranked in terms of dPIT/dx_sulfonate. A “cation” scan with the [DiC ₆ CHSO ₃ ] _m M /benzene/water systems at f_w = 0.5 was finally performed confirming the hydrophilicity ranking obtained with the PIT-slope method. It revealed that the [DiC ₆ CHSO ₃ ] ₂ Mg behaves as a “Balanced Surfactant” able to form spontaneously a three-phase microemulsion system (Winsor III) just in the presence of water and oil, in the same way as the catalytic surfactant dimethyldioctylammonium molybdate, which has the same PIT-slope.     

A Uniform Approach for Utilizing Synergy between Inspection Technologies and Computational Methods

Emerging scanning technologies currently capture diverse data that includes geometrical and physical properties (i.e. normals, material and color). Yet, existing inspection computational methods do not satisfy industry demands. This paper proposes a new approach for inherently handling diverse data and utilizing the synergy between inspection technologies and digital processing methods. Two methods were developed: a Hierarchical Space Decomposition Model (HSDM), which sorts the sampled data, and a 3D Geometrical Bilateral Filter (3D GBF) that utilizes the diverse data. These methods provide efficient data reduction while preserving sharp features. The feasibility of this approach is demonstrated on the diverse data.     

Application of neuro-fuzzy techniques in oil pipeline ultrasonic nondestructive testing

This paper presents a novel approach to the problem of nondestructive pipeline testing using ultrasonic imaging. The identification of the flaw type and its dimensions are the most important problems in the pipeline inspection. Unlike typical methods, a decision based neural network is used for the detection of flaws. We train a generalized regression neural network to determine the dimensions of the corrosions and generate the whole image of both the internal and external walls of the oil pipeline. As an improvement to the detection algorithm, we introduce fuzzy decision-based neural network algorithms for the detection and classification of the corrosions. The simulation and experimental systems results show that these new methods outperform the existing methods.     

雅砻江楞古水电站场址区宋玉断层活动性研究

楞古水电站位于区域构造复杂的雅砻江中游, 场址周边断裂构造较发育, 场址区内发育有较大的宋玉断层, 研 究其活动性对枢纽建筑布置和工程抗震设防措施均具有重要意义。在遥感解译的基础上, 通过野外验证和追踪调 查, 结合断层构造岩石英形貌扫描、 电子自旋共振(ESR) 测龄和近代地震震中分析, 确定了宋玉断裂的活动年代, 得 出了宋玉断层不属于工程活动断层的结论。