Development Review and Prospect of Wing-in-Ground Effect Craft

介绍了国内外地效飞行器发展情况和研制的最新进展,对其特点和应用前景进行了叙述,分析了地效飞行器发展中存在的技术障碍,探讨了地效飞行器的发展方向

An Inquiring System For Books based on SMS

在分析了目前传统查书方式的缺点和短信查询优势的基础上提出了利用短信实现客户服务的系统模型,详细分析其实现方案。并讨论了关键技术和解决方法。该系统现已投入使用,具有接入简单,处理迅速,可扩展性好等特点。Because of the shortcoming of traditional method of inquiring about books, this paper presente a system of utilizing the short message to serve the customers. The system can easily be installed and is running well.厦门大学信息985二期创新平台项

The Hydraulic Cylinder with Extensive Position Controlled Piston Rod

该文介绍了一种活塞杆伸出量可测并可控的液压缸。该缸利用滚珠丝杆将活塞杆的直线位移转化为丝杆角位移的方法进行位置测量,其结果由光栅编码器输出并传送到控制中心,由控制中心控制伺服阀的阀口方向和开口大小,从而对液压缸活塞杆产生控制作用。本文对其原理进行了阐述,并对可能存在的测量误差进行了分析。This paper introduces a hydraulic cylinder that its piston rod extension can be effectively controlled,linear displacement of the piston rod can be changed into the screw angular displacement by ball screw,then the distance are outputted by grating angular displacement sensor to the control center,valve port opening direction and size are controlled by the control center and then hydraulic cylinder piston rod is controlled so.This paper describes its principles and demonstrates its feasibility

Dynamic Performance Simulation of Pressure Relief Valve and Test

【中文摘要】 为找出影响减压阀工作特性的主要因素,从而为改进同类产品性能提供设计理论依据,用自动控制理论建立减压阀的数学模型,用Matlab软件的simulink工具仿真减压阀的动态性能,并通过试验台测试结果与仿真进行对比,提出影响减压阀性能的主要结构参数. 【英文摘要】 A mathematical model for the pressure relief valve with automatic control was established using the Matlab simulink tools,among others,the dynamic performance of the relief valve and the main factors affecting valve operating are simulated.Numerical results are compared in accordance with experimental data.The present work would serve as a theoretical basis for improving product design and performance

The Actual State and Development Trend of Hydraulic Cylinder with Positon Sensor

随着现代生产向着高效、精准、环保等方向发展,一种活塞杆伸出量可控的液压缸在众多领域得到应用,如轧钢、注塑、飞机系统等。本文对现行带位置测量液压缸的各种技术方案做了简单介绍,并对未来的发展趋势进行了探讨。With modern production developing towards efficient,accurate,a hydraulic cylinder can be effectively controlled is used in many fields,such as rolling,injection molding,aircraft systems.This article introduces the various technical programs on the current position.At last its possible future trends are discussed

The Application of an Improved Temporal Algorithm of Association Rules to Intrusion Detection

入侵检测系统的性能在很大程度上与它的检测规则有关,所以如何更快更有效地从网络数据中获取有效的检测规则对于一个IDS(入侵检测系统)来说就变得格外重要.本文在分析了传统关联规则算法缺点的基础上,对关联规则挖掘算法的优化策略和时态因素的分类处理重点进行了讨论.即在利用主属性约束最后规则的同时,提出了高频属性直接入选的策略.以更快地获取有效的入侵检测规则.实验测试结果表明,优化后的算法在挖掘速度和规则的检出率等性能上有较大提高,找到了一些原来被忽略的规则并剔除了一些不重要的规则,证明此优化算法是切实有效的.The capability of intrusion detection system is related to its detected rules greatly,so how to get the valid intrusion detection rules quickly from network data is very important to IDS(Intrusion Detection System).In this paper the drawback of the traditional algorithm of association rule is analyzed.And then the optimizing policy about data mining algorithm and the method of disposing temporal data are discussed specially.The main attribute is used to restrict the final rules.And some attributes are included in the final rules directly according to their high frequency.The improved algorithm is more improved in mining speed and detectable probabilities of final rules.Some formerly ignored rules are discovered,at the same time some unnecessary rules are eliminated in the experimentation.The validity of the improved algorithm is proved by the experimentation.福建省教育厅科技项目(Ja05290);; 厦门大学信息“985”二期创新平台项目资

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel