基于ZigBee通信网络的农机作业监测系统设计

首先，介绍了ZigBee通信网络技术，并设计了系统总体设计方案；然后，分别从转速测量模块、振动信号采集模块和割台高度检测设计了系统硬件部分；最后，针对设备节点和协调器两部分设计了ZigBee无线网络传输软件，实现了农机作业监测系统。测试结果表明：系统能够正确采集农机作业参数并通过无线网络发送到云平台，证明系统的可靠性和可行性。     

基于ZigBee技术的农田节水灌溉系统

结合我国的农业现状,介绍了基于Zigbee技术的农田节水灌溉系统及其实现方法和应用前景.Zigbee是为低速率控制网络设计的标准无线网络协议,系统采用以CC2430芯片为核心的无线数字通信模块,实现对农田灌溉进行无线监测与控制.系统利用工控机与第一层网络协调器进行有线通信,实现了对整个网络运行的集中监控和数据信息的存储.     

基于ZigBeeCC2430的土壤含水率监测系统设计

针对农田土壤环境参数大滞后及大惯性的特点,基于低功耗ZigBee CC2430无线通信技术,设计了土壤含水率监测系统。通过运用无线传感器智能信息处理技术及数据通信技术,使得监测系统的自动化与监测水平得到提升。该系统采用星型拓扑结构组网,通过在监测区域部署网络节点,将监测数据汇集到监测中心,实现统一的数据管理和Zigbee网络的路由监测功能。给出了系统硬件和软件实现方法,包括无线传感器节点设计、数据采集、传输及通信等模块的实现原理。遵循模块化设计思想,传感器和功能模块可组合配置,通用性强。对于农田土壤含水率的监测实验结果表明,该系统性能稳定,能够实现数据采集、传输及显示,可广泛应用于各领域的环境参数自动监测。     

基于STM32电力谐波采样设备的设计

为实现低成本检测电力线谐波,开发基于STM32F103RBT6嵌入式微控制器的电力谐波采样设备,使用CS5463电量采集芯片及以Zigbee传输参数的无线电参数检测器,实现0.4 k V农村低压电网的电参数采集检测及电量计量。介绍设备的总体架构、软硬件设计思路以及实现方案。测试结果表明:设备能够在短时间内进行谐波采样和分析,具有稳定性强、可扩展性强、成本低廉等优点。     

基于RFID与Zigbee的牛场远程监测系统设计

针对传统畜牧业的局限性,对现阶段Zigbee技术和嵌入式技术进行了分析,将RFID技术与Zigbee技术完美结合,提出了一种牛场无线远程监控系统。该监控系统有牛只管理、生殖保健管理、产奶管理、决策支持管理、营养搭配管理及智能预警管理等功能模块,分别设计了牛只管理、牛奶品质检测、通用模块节点和牛场感知模块。牛场选程监测系统为奶牛养殖的现代化管理、疾病防治和食品安全等提供了有效的手段与方法,具有良好的应用前景。     

基于CC2430的温室智能无线传感器节点设计

针对温室环境数据信息监控的特点,设计和开发了一种能够监测温湿度的无线智能传感器节点.采用集射频与微控制器于一体的CC2430作为ZigBee无线网络节点的核心器件,传感器采用SHT11数字温湿传感器,介绍了无线传感器节点的硬件设计原理、组成及软件实施流程等.经测试,所设计的节点成本低廉,功耗低,并拥有简单而灵活的通信网络协议,适合在温室、大棚和精细农业等领域推广应用.     

基于WSN的低功耗湿地土壤监测系统设计

针对扎龙自然保护区的土壤环境监测需求,采用CC2530PA模块设计终端节点,基于Z-Stack协议栈搭建自组织传感网络,传感器选取土壤湿度传感器、温度传感器以及雨滴传感器,组建低功耗湿地土壤监测系统。系统结合低功耗路由协议和实际环境监测需求提出采集发送端低功耗节点设计的改进算法,有效地减少节点的功耗、传输延迟和丢包率,从而延长整个网络生存时间。     

基于Zigbee的温室无线传感器节点设计与实现

基于Zigbee的无线传感器网络具有广泛的应用前景.为此,基于Zigbee协议设计了一种带扩展板的节点,传感器可根据需要配置,从而提高了系统应用的灵活性.处理器选择超低功耗片上系统CC2430,其集成了8051CPU和无线射频收发器CC2420,所设计硬件系统外围器件少,功耗低.     

基于Wi-Fi无线传感器网络的温室环境监测系统设计

为了解决当前温室大棚种植监测系统存在布线复杂、节点功耗大等问题,提出了一种基于Wi-Fi无线网络传感器的温室监测系统,对温室大棚的温度、湿度、光照及CO2的浓度进行实时监测。以GS1011M为核心开发无线终端节点,同时以上位机软件搭建实时观测平台,通过无线通信网络实时接收传感数据,完成对监测区域内目标的监测。结果显示,温室大棚环境监测系统功耗低,数据准确度高,工作稳定。     

一种智能运维配电室监测方案及应用

正随着电力用户的不断增长,用电设备的数量和种类迅速增加。传统的人工运维、人工巡检存在巡检周期长和易发生漏检、错检等不足,已跟不上电网智能化发展的需求。积极探索和尝试经济实用智能化的运维检测方案和技术手段,运用实时感知、在线监测等科学技术手段,实现运维智能化建设已成为必然。配电室作为电力运维的重要节点,具有点多、面广、运维工作量巨大等特点,所以积极探索配电室的智能运维监测方案和应用具有较强的现实意义。笔者现对基于智能运维的配电室监测方案进行介绍供参考。     

Overland water and salt flows in a set of rice paddies

Cultivation of paddy rice in semiarid areas of the world faces problems related to water scarcity. This paper aims at characterizing water use in a set of paddies located in the central Ebro basin of Spain using experimentation and computer simulation. A commercial field with six interconnected paddies, with a total area of 5.31 ha, was instrumented to measure discharge and water quality at the inflow and at the runoff outlet. The soil was classified as a Typic Calcixerept, and was characterized by a mild salinity (2.5 dS m⁻¹) and an infiltration rate of 5.8 mm day⁻¹. The evolution of flow depth at all paddies was recorded. Data from the 2002 rice-growing season was elaborated using a mass balance approach to estimate the infiltration rate and the evolution of discharge between paddies. Seasonal crop evapotranspiration, estimated with the surface renewal method, was 731 mm (5.1 mm day⁻¹), very similar to that of other summer cereals grown in the area, like corn. The irrigation input was 1874 mm, deep percolation was 830 mm and surface runoff was 372 mm. Irrigation efficiency was estimated as 41%. The quality of surface runoff water was slightly degraded due to evapoconcentration and to the contact with the soil. During the period 2001–2003, the electrical conductivity of surface runoff water was 54% higher than that of irrigation water. However, the runoff water was suitable for irrigation. A mechanistic mass balance model of inter-paddy water flow permitted to conclude that improvements in irrigation efficiency cannot be easily obtained in the experimental conditions. Since deep percolation losses more than double surface runoff losses, a reduction in irrigation discharge would not have much room for efficiency improvement. Simulations also showed that rice irrigation performance was not negatively affected by the fluctuating inflow hydrograph. These hydrographs are typical of turnouts located at the tail end of tertiary irrigation ditches. In fact, these are the sites where rice has been historically cultivated in the study area, since local soils are often saline-sodic and can only grow paddy rice taking advantage of the low salinity of the irrigation water. The low infiltration rate characteristic of these saline-sodic soils (an experimental value of 3.2 mm day⁻¹ was obtained) combined with a reduced irrigation discharge resulted in a simulated irrigation efficiency of 60%. Paddy rice irrigation efficiency can attain reasonable values in the local saline-sodic soils, where the infiltration rate is clearly smaller than the average daily rice evapotranspiration.     

车用发动机润滑油失效规律与更换周期研究

研究在正常使用条件下１０Ｗ／３０－ＱＣ级润滑油用于某型车用发动机时所表现的失效规律,确认期服从两参数Ｗｅｉｂｕｌｌ分布,并给出分布的尺度参数η和形状参数ｍ之最佳线性无偏估计（ＢＬＵＥ）同时,还为定量分析,计算车用发动机润滑油的使用可靠性和合理确定其更换周期提供了一套可供借鉴的方法,并给出了具体的计算实例。     

农村剩余劳动力就业问题的探讨

论述了我国农村剩余劳动力就业的意义,并针对我国农村剩余劳动力的现状,提出多渠道促进农村剩余劳动力就业的途径和办法。     

金谷子耐旱TG118引种试种及推广应用

对引进的谷子新品种金谷子耐旱TG118进行品种比较试验和多点试种。结果表明：该品种抗旱、耐瘠、适应性强,稳产、高产、抗病抗风抗倒伏强,品质优良,粮草兼用,种植简单,省工易管;一般产量在6000kg/hm2以上,比当地主栽品种增产20%以上。最高产量达9450kg/hm2,适于在辽西北地区推广应用。     

对《种子法》存在问题的探讨

《种子法》是我国种植业第一部法律。自实施以来,为依法加强种子管理提供了有力的法律支撑,促进我国种子产业发生翻天覆地的变化。但随着依法管理工作的深入和种子产业的快速发展,《种子法》及配套规章的一些问题逐步显现出来。对《种子法》及配套规章存在的问题进行深入分析,对需要进一步补充的章节以及需要调整的内容进行深入探讨,以求更加完善和明确。     

瓦房店市水果生产标准化发展研究

瓦房店市是我国重要的水果生产基地,在国内水果生产领域占有重要地位。随着水果市场化的不断深入,如何满足和适应国内外市场需求成为瓦房店市水果生产的关键问题。从瓦房店市水果生产实际出发,阐述了实施水果生产标准化的必要性,提出了发展水果生产标准化的具体措施。     

乡（镇）农业技术推广体系存在的问题及对策

乡（镇）农技推广体系是农业发展的关键。介绍朝阳市农业技术推广体系的现状,针对目前体制及运行机制、服务手段等方面存在的问题,提出适合朝阳市乡（镇）农技推广体系改革与发展的对策,以期对全省农技推广体系改革和发展起到一些借鉴作用。     

草莓的采收与贮藏

草莓果味酸甜爽口,营养价值高,为人们所喜爱的应市鲜果之一。由于草莓易受损伤和微生物侵染,因此其采收、贮藏过程极为重要。介绍草莓采收过程中的注意事项以及11种贮藏保鲜技术的实施步骤和操作方法,推介9种加工方式,为草莓产业化提供技术支持。     

和谐社会理论建设的几点哲学思考

在新世纪,面对机遇和挑战,党的十六大把“社会更加和谐”作为全面建设更高水平的小康社会的一个重要目标。中国人素有社会和谐的理想;西方人自古也向往社会和谐;借鉴东西方两种和谐社会思想的经验、教训,构建社会主义和谐社会理论。     

Review of the Egyptian experience in implementing land drainage projects

About 30 years have passed since the Government of Egypt embarked on implementing a series of large scale drainage projects. At present, about 3.8 million acres have been provided with drainage systems on the basis of systematic pre-drainage investigations and designs. The target is to provide drains in approximately 6.4 million acres in the Nile Valley and Delta.The implementation of the subsurface drainage system is carried out by the public sector and private contractors under direct supervision of governmental regional departments. The implementation process depends on many factors related to the drainage material, machinery, manpower, site requirements, farmers and organizations involved. Problems and constraints are sometimes challenging, however, the annual rate of implementation has gradually increased to 170,000 acre/year.This paper discusses the different aspects involved in the implementation process of drainage systems. The development in materials, machinery and construction technologies will be reviewed. Institutional and management factors are going to be also considered.