"数字农业"及其实现技术

文章介绍了“数字农业”的含义、特点以及其所涉及的技术体系，说明了它对我国农业发展具有重大意义。     

虚拟仪器技术及其在距离保护中的

介绍了虚拟仪器的发展过程以及虚拟仪器的软件与硬件的基本构成原理,设计了一套虚拟仪器系统，并在此基础上对距离保护进行了仿真实验。认为虚拟仪器在电力系统具有广泛的应用前景，是今后一段时间的发展方向。     

基于Labview的植物红光吸收动态监测

为了动态监测植物生长过程中对红光的吸收，提出了一种基于Labview光频转换接收探头透射法实时监测植物红光吸收的检测方案，该方案属于无损检测，具有操作安全、简便的特点。     

一种基于数据动态迁移的分级备份系统的研究

随着运营商信息化进程的不断深化，业务数据量处于高速的增长，管理信息系统的高效访问以及安全性正在变得越来越重要。本文以信息系统的数据价值评估为基础，提出一种数据动态迁移模型，并引入虚拟带库作为近线存储，形成完整的解决方案。实现传统备份到分级备份的升级改造，优化信息系统备份架构，提高数据的访问以及保护的效率。     

Design of Data Acquisition System for Vehicle Based on CAN Bus

To the question that a meter is correspond with a set of lead and a sensor,this paper presents a design of data acquisition system for vehicle based on CAN bus.In this way,the combinatorial instrument is only connected by a bus unit.Author introduces the data acquisition structure chart and the CAN interface,analyzes the software by program flow chart,and shows it's application for vehicle virtual instrument.A method of calculating vehicle speed,engine rotate speed and the course of development mileage are also given.     

Frequency Refining Analysis and Its Applications in the VIs

Frequency refining is an important spectrum analyzing tool, and is one of the main function of signal processing and the virtual instrument. This paper introduces several typical frequency refining analysis methods including DFT and multiple modulation and so on. It also probes into their advantages and disadvantages, and proposes a new frequency refining method combining subband decomposing DFT and multiple modulation, which inherits the advantages of multiple modulation, needs not to design a specific filter, reduces the amount of calculation, and is fit for real-time refining analysis. At last, it exhibits several frequency refining algorithm and their effects with applications in virtual instruments.     

Detecting System of the Dielectric Loss in Capacitive Equipment Based on Virtual Instruments

A digital detecting system of the dielectric loss in the capacitive equipment is introduced based on virtual instruments.This system can real-time collect,analyze,process and storage electrical signals with National Instruments' program LabVIEW and ADLINK,s DAQ board.Through the simulation test in lab and the real test in electric substation,it is shown that this system has high accuracy on testing the dielectric loss in the capacitive equipment,the real test data is stable and the relative error of real dielectric loss is less than 5%.It is to say that this system can meet the requirement of the real on-line monitoring.     

基于虚拟仪器的农产品"身份证"数字识别系统

介绍了基于虚拟仪器图形化语言LABVIEW开发的农产品"身份证"数字识别系统,采用CCD摄像机对农产品"身份证"编号进行采集,通过PCI-1411彩色图像采集卡将图像传输到计算机并进行图像处理,最后应用美国NI公司的OCR软件包对处理好的编号进行识别.结果表明,该系统抗干扰能力强且精度高.