摘要：A real-time data compression wireless sensor network based on Lempel-Ziv-Welch encoding(LZW)algorithm is designed for the increasing data volume of terminal nodes when using ZigBee for long-distance wireless *** system consists of a terminal node,a router,a coordinator,and an upper *** terminal node is responsible for storing and sending the collected data after the LZW compression algorithm is compressed;The router is responsible for the relay of data in the wireless network;The coordinator is responsible for sending the received data to the upper *** terms of network function realization,the development and configuration of CC2530 chips on terminal nodes,router nodes,and coordinator nodes are completed using the Z-stack protocol stack,and the network is successfully *** the final simulation analysis and test verification,the system realizes the wireless acquisition and storage of remote data,and reduces the network occupancy rate through the data compression,which has a certain practical value and application prospects.

摘要：To test the pulse signal of initiating explosive device (IED) in an aircraft,a multi-channel equivalent system for IED based on Gigabit Ethernet transmission is designed according to its electrical parameters. The output voltage of multi-channel equivalent circuit is converted by analog-to-digital converter (ADC). Then the validity of the converted signal is judged by field programmable gate array (FPGA). Finally,it is transmitted the host computer through Gigabit Ethernet for waveform displaying. Compared with the traditional equivalent equipment of IED,the designed system here can not only test the validity of the pulse signal and normal operation of equivalent circuit,but also realize fast and reliable analysis of pulse signal by means of Gigabit Ethernet. It solves the problems of low speed and lag of response of traditional equivalent equipment.

摘要：Due to complex computation and poor real-time performance of the traditional iris recognition system,iris feature is extracted by using amplitude and phase information of the mean image blocks based on Gabor filtering on image,and the k-nearest neighbor algorithm is combined to complete iris recognition *** recognition reduces the recognition time and improves the recognition *** the same time,identification result is transmitted to the cloud server through ZigBee network to solve diffcult wiring *** experiment shows the system runs stably and has fast recognition *** has been applied to a security system.

摘要：目前,超疏水涂层存在着制备成本高、工艺复杂和环境污染等问题,阻碍了其工程化应用进程。文章以CaCO_(3)晶须及其纳米粒子为填料,水性苯丙乳液为粘结剂,以及硬脂酸锌为疏水改性剂制备超疏水涂层。首先采用油酸对CaCO_(3)晶须及其纳米粒子进行表面改性,然后基于极端顶点设计将改性后的CaCO_(3)晶须、改性后的纳米CaCO_(3)、苯丙乳液和硬脂酸锌为混合分量进行混料实验,以涂层接触角为响应变量建立回归模型,分析混合分量对接触角的影响。结果表明:采用不同形貌的CaCO_(3)粉体复合苯丙乳液可制备出超疏水涂层,在纳米CaCO_(3)与硬脂酸锌混合分量较高,CaCO_(3)晶须混合分量较低以及苯丙乳液适中的区域,接触角可达153.5°。通过表面形貌分析,涂层的黏附性与其表面的孔洞有关,而较高的纳米CaCO_(3)混合分量可降低涂层表面粗糙度,促进其超疏水性能。

摘要：本系统设计的是以三电平空间矢量控制方案建立调制数学模型并分析控制过程,以瞬时无功理论为基础对无功量进行提取,又讨论了负载在不平衡时的补偿,通过基于d-q坐标系的双序同步控制SVG的策略,分离出三相不对称的正负序分量,采用对正序和负序同步控制器分别对SVG的输出进行正序和负序分量闭环反馈控制,最终实现对无功功率的实时补偿和提高电网的功率因数,通过仿真验证了该理论的正确性,并且通过实验对其中阻感负载情况下的无功分量进行实时补偿,根据提取的无功量通过空间矢量调制,补偿到电网中使功率因数得到显著提升。

摘要：将MATLAB与DSP结合起来,实现在MATLAB/Simulink中搭建算法,编译生成DSP代码,控制直线电动机,从而获得电机的频率特性数据。并利用由幅频特性推导传递函数的原理,编写M文件处理数据,获得直线电动机的拟合状态方程和传递函数。通过对比电机、拟合状态方程和传递函数的频率响应,得到传递函数,用于直线电动机的控制设计中。

摘要：梅山钢铁公司炼钢厂有 2座 15 0t的LD转炉 ,配 40t板坯连铸中间包 .为了了解和掌握中间包内部过程的基本特征 ,在实际中间包内对流动控制装置、钢水停留时间分布及熔池内温度分布情况进行了现场测试 ,并结合数学和物理模拟方法进行分析 .研究结果表明 :钢包与中间包内钢水的温差对中间包内钢水的流动状态有很大影响 ,进而影响着中间包内许多冶金过程 ;实际中间包熔池内温度分布不均 ,即使没有任何流动控制装置 ,熔池内上部温度也高于下部温度 ,现场测定的停留时间曲线与传统的等温水模型实验结果相差较大 ;在大多数生产条件下 ,中间包内的流动是非等温流动 ,以等温条件为前提的挡板设计、控制参数可能与实际情况不符 。

摘要：有害藻华是海洋中最为常见的一类生态灾害问题,对养殖业、旅游业和公众健康等造成了严重威胁,也给海洋管理带来了巨大的挑战。近年来,与有害藻华相关的生物、化学、水文、气象等观测数据以及有害藻华发生记录等统计数据不断积累,统计学方法、地理信息系统(Geographic Information System,GIS)等数据分析方法也在快速发展,为深入挖掘有害藻华时空演变特征、提高有害藻华监测预警水平奠定了重要基础。该研究综合应用数据库、地理信息系统及可视化技术,设计了一套集有害藻华多源异构数据管理、分析与可视化为一体的综合平台,能够实现对有害藻华相关数据的存储和动态关联,并集成了空间分析方法,实现了数据和分析产品的可视化。该研究以渤海有害藻华长期时空演变特征探究为案例,展示了该平台在有害藻华数据分析与可视化方面应用效果。该平台可望为公众科普、科学分析和政府决策等提供支撑。

摘要：本文从计算机基础教学平台建设的目的和意义出发，着重介绍了该平台的系统结构与功能．并对该平台的设计与开发技术进行了粗浅的探讨。

摘要：通过具体应用SPSS对完全随机试验设计、随机区组试验设计、拉丁方试验设计以及正交试验设计的试验数据进行数据分析以及应用Excel对数据分析结果作图的实例,说明2个软件的有效结合可以满足动物科学专业对本科生毕业论文的要求。