曲面磨光法及其在煤田隐伏构造预测中的应用

趋势面分析是煤田中预测隐伏构造的常规方法。在认真研究前人工作和地质特点的基础上,本文提出了用曲面磨光法进行构造预测。此法的最大特点就是平板磨光后仍为平板,且与原平板重合,这一优良的数学特性,使得它在构造预测方面优于趋势面等方法。通过对模型和实例的分析,证明曲面磨光法在构造预测,特别是对隐伏断裂构造的预测是相当有效的。     

用刀具各剖面角度换算公式换算刀具工作角度

本文介绍了将刀具进给剖面或切深剖面内的工作角度换算至主剖面内的新方法——用刀具各剖面角度换算公式计算。此法不仅简便,而且适用于刀具倾角为任何值的情况。     

序列脉冲检测电路状态转换图的最佳设计方法

本文介绍了序列脉冲检测电路状态转换图的最佳设计方法——递推、映射两步法.即“递推设定”法设计状态转换主链、“映射比较”法确定状态转换分支.从而使得序列脉冲检测电路状态转换图的设计工作,具有思路清晰、规律性强、准确率高的特点,解决了该类电路设计工作中的一大难点.     

容差扩展原则及其应用

本文提出容差扩展的三原则,并按该原则分析了电压比较器μA710(SN52510,TEXAS),提出了改进方案.按该方案集成的电压比较器FBC_(01)与同样条件下的μA710相比,成品率提高两倍,迟延时间缩小四倍,参数一致性显著提高.     

17O Knight shift study in the superconducting state of Sr2RuO4

¹⁷O Knight shift measurements in Sr₂RuO₄ were performed over the wide range of magnetic field 3.2-11.4kOe parallel to the basal RuO₂ planes. The spin susceptibility is totally unchanged through its T_c, evidencing that the spin-triplet superconducting state is realized in Sr₂RuO₄. The result indicates that the Cooper pairs consist of the parallel spin pairs | > and | > with their quantization axis perpendicular to the c-axis direction. The in-plane 2D nearly ferromagnetic spin fluctuations may play a role for the stabilization of this state among various representations of spin-triplet order parameter.     

北京谱仪-Ⅱ主漂移室干扰噪声的研究

研究了北京谱仪－Ⅱ主漂移室干扰噪声（ｐｉｃｋ－ｕｐ噪声）的主要表现形式,分析了噪声的来源,提出了解决办法。     

动态系统的自适应模糊神经网络控制

　Aim　To build an adaptive fuzzy neural controller and simulate it. Methods Fuzzy logic and back propagation(BP) algorithm are combined to utilize their advantages while avoiding the disadvantages. Results and Conclusion Simulation results of the third-order plant with disturbances and dead times show the validity of the presented controller. The presented controller can control cases that preceding controllers were unable to control.     

IDES: An Internet Distance Estimation Service for Large Networks

The responsiveness of networked applications is limited by communications delays, making network distance an important parameter in optimizing the choice of communications peers. Since accurate global snapshots are difficult and expensive to gather and maintain, it is desirable to use sampling techniques in the Internet to predict unknown network distances from a set of partially observed measurements. This paper makes three contributions. First, we present a model for representing and predicting distances in large-scale networks by matrix factorization which can model suboptimal and asymmetric routing policies, an improvement on previous approaches. Second, we describe two algorithms-singular value decomposition and non-negative matrix factorization-for representing a matrix of network distances as the product of two smaller matrices. Third, based on our model and algorithms, we have designed and implemented a scalable system-Internet Distance Estimation Service (IDES)-that predicts large numbers of network distances from limited samples of Internet measurements. Extensive simulations on real-world data sets show that IDES leads to more accurate, efficient and robust predictions of latencies in large-scale networks than existing approaches     

Monolithically Integrated Optoelectronic Receivers Implemented in 0.25μm MS/RF CMOS

设计了一种单片集成的光电接收机芯片．在同一衬底上制作了基于同一工艺的光电二极管与接收机电路，以消除混合集成引入的寄生影响．这种单片集成接收机采用了先进的深亚微米MS／RF（混合信号／射频）CMOS工艺，利用这种新型工艺提供的新技术对原有光电二极管进行了改进，使其部分性能显著改善，并对整个光电集成芯片性能的提高有所帮助．