九江三期1号主变出厂冲击试验失败原因及处理

九江三期发电工程采用两台 4 4 5MVA主变压器 ,分别将两台 35 0MW发电机的 2 3kV出口电压升高到 2 2 0kV接入升压站。其中 1号主变压器在制造厂进行冲击试验时 ,两相高压绕组发生绝缘击穿 ,未通过冲击试验。针对该变压器的此次冲击试验造成的损坏部位及形成原因进行分析 ,找出变压器的绝缘设计和制造工艺上的缺陷 ,提出处理措施 ;另一方面通过比较此次雷电冲击电压与操作冲击电压对变压器绝缘损坏的部位的不同 ,判断这两种冲击试验对变压器不同部位绝缘检测的有效性     

GM计数管脉冲供电电压对计数率的影响

本文重点介绍了ＧＭ计数管脉冲供电电压对计数率的影响。经测试分析研究，结果表明脉冲供电比固定电压供电电压变化对ＧＭ管计数率的影响较大，应对脉冲电源提出更高的要求，     

Polarization Phase-Based Method For Material Classification In Computer Vision

A robust and accurate polarization phase-based technique for material classification is presented. The novelty of this technique is three-fold in (i) its theoretical development, (ii) application, and, (iii) experimental implementation. The concept of phase of polarization of a light wave is introduced to computer vision for discrimination between materials according to their intrinsic electrical conductivity, such as distinguishing conducting metals, and poorly conducting dielectrics. Previous work has used intensity, color and polarization component ratios. This new method is based on the physical principle that metals retard orthogonal components of light upon reflection while dielectrics do not. This method has significant complementary advantages with respect to existing techniques, is computationally efficient, and can be easily implemented with existing imaging technology. Experiments for real circuit board inspection, nonconductive and conductive glass, and, outdoor object recognition have been performed to demonstrate its accuracy and potential capabilities.     

网络服务器软件老化现象的测试与分析

提出了一种测试软件老化过程的实验方案，编制了实现该方案的软件工具集，并以应用广泛的Apache网络服务器为目标，研究了当负载为泊松流时服务器的老化现象，用回归分析和ARIMA(自回归差分滑动平均)模型分析了剩余内存的变化情况。结果表明ARIMA模型可以较好地描述和预测内存的使用情况。     

管道泄漏计算机在线检测系统及其算法实现

设计了管道泄满计算机在线检测系统的总体结构，提出了一种基于工况分析的逻辑判决故障检测算法，当输油管道工作状况不断发生改变时，这种方法能够动态估计管道运行数据的正常值范围，很好地解决输油管道泄漏的故障检测问题，结合GPS技术和负压波定位算法，大大提高了报警准确性和定位精度，现场测试结果和实际工业应用证明了该方法的有效性。     

A framework for determining design correctness

Quality is one of the main concerns in today's systems and software development and use. One important instrument in verification is the use of formal methods, which means that requirements and designs are analyzed formally to determine their relationships. Furthermore, since professional software design is to an increasing extent a distributed process, the issue of integrating different systems to an entity is of great importance in modern system development and design. Various candidates for formalizing system development and integration have prevailed, but very often, particularly for dynamic conflict detection, these introduce non-standard objects and formalisms, leading to severe confusion, both regarding the semantics and the computability. In contrast to such, we introduce a framework for defining requirement fulfillment by designs, detecting conflicts of various kinds as well as integration of heterogeneous schemata. The framework introduced transcends ordinary logical consequence, as it takes into account static and dynamic aspects of design consistency and, in particular, the specific features of the state space of a specification. Another feature of the approach is that it provides a unifying framework for design conflict analysis and schema integration.     

Modelling and FDI of Dynamic Discrete Time Systems Using a MLP with a New Sigmoidal Activation Function

In this paper we investigate the use of the multi-layer perceptron (MLP) for system modelling. A new sigmoidal activation function is introduced and the study is focused at the utilization of this function on a MLP that performs modelling of dynamic, discrete time systems. The role of the activation function in the training process is investigated analytically, and it is proven that the shape of the activation function and it's derivative can affect the training outcome. The method is simulated at a well known benchmark, namely the three tank system, and is incorporated in a Fault Detection and Identification (FDI) method, also applied and simulated at the three tank system. Finally, a comparison is made with an approach that utilizes local model neural networks for system modeling.     

多用户检测技术的发展与应用

CDMA系统是一个自干扰系统，多址干扰是限制其容量和性能的主要原因之一，传统的相干接收机不能从根本上解决消除多址干扰的问题，因此如何抑制多址干扰引起了通信界学者们的关注．多用户检测技术能从根本上消除多址干扰，提高系统的性能。文中主要介绍了多用户检测的思想和检测器的分类，以及衡量多用户检测器性能的三个重要指标，还阐述了多用户检测技术的新发展和该技术在几个具体系统中的应用。     

井下粉尘多参数检测的自适应方法

为提高井下粉尘计重含量检测精度并同时获得粒度分布参数,根据井下粉尘衍射光的角谱特征,提出了一种适合于在单片机上运行的算法。首先将衍射光角谱归一化,使得不同浓度但粒度分布相同的尘样具有相同的归一化角谱,而该角谱与给定模式的角谱的贴近程度则用差值平方和表征。由几个优选模式求得的计重含量或粒度分布取加权平均即可获得待求参数。考虑到现场环境中噪声抑制能力和对尘样多样性的适应能力至关重要,本文中最后给出了针对这两个方面的仿真实验结果。