共查询到20条相似文献，搜索用时 62 毫秒
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介绍采用GPRS模块实现远程水资源数据监控的系统.各监控点的数据采集终端将采集到的数据信息传输到系统的监控中心,监控中心对传榆回来的数据进行记录、存储、分析,并把需要的控制信息传送到监控点,从而实现水资源数据实时采集.处理和控制. 相似文献
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为实现土壤含水率实时监测及数据的远程传输,以太阳能电池及锂电池作为整个系统的能量供给,采用电场法测量土壤含水率;通过GSM网络,利用短消息实现土壤含水率数据的实时传输。电源模块实现太阳能的收集及存储,并对整个系统的电源实现管理。系统将土壤含水率转换成电压信号后,对其整流、A/D转换、计算等相关处理后得到土壤的含水率。利用实时时钟电路与SD卡,可实现每天的数据存储。土壤含水率及系统状态异常信息可通过短消息发送到指定手机或终端。试验表明,当被监测的紫色土或黄壤含水率低于30%时,测量误差小于6%。系统每6h测量并存储一次监测数据,每24h发送一次,其余时间处于休眠状态。在该条件下,3 W的太阳能电池能满足系统的能量需求。如果太阳能电源模块出现故障,导致锂电池无法充电时,系统能发送警告短消息,提醒用户及时排除故障。 相似文献
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为了解决花生收获过程中的实时自动测产及远程数据监测存储问题,设计了基于智能传感器的花生收割机实时测产远程监测存储系统,提出了一种新的测产机械结构和方法,并利用智能路由器加密通道建立了一套API框架体系,实现了测量数据的远程传输与实时共享。试验结果表明:收割机终端测产值与智能路由器传回至服务器的数据相对误差绝对值小于5%,数据传输速度快,具备较大的扩展性,验证了测产系统的可行性、可靠性和准确性,应用前景宽广。 相似文献
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甘蔗收割机作业工况数据的实时监测具有重要的实际意义,设计并实现一种基于云平台的甘蔗收割机作业远程信息平台。通过PLC、CAN总线和Modbus协议完成车载端的现场作业数据实时采集,使用通信模块并采用MQTT协议将数据上传到云平台,终端用户可以通过手机App或Web访问云数据,实现移动终端对甘蔗收割机作业工况数据的实时监测。通过现场测试结果表明：在1.52 h内,实际收到甘蔗收割机实时传来数据5 465条,数据丢失7条,数据准确率为99.88%,丢失率为0.12%。该系统对甘蔗收割机数据监测参数准确,实时性高,能够实现甘蔗联合收割机作业数据的实时采集、远程传输、数据储存与分析等功能,为甘蔗联合收割机的智能化与信息化应用提供了技术支撑。 相似文献
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基于无线传感器网络的农田灌溉远程监控系统 总被引：2，自引：0，他引：2
为了实现自动灌溉控制,节约农田灌溉用水,设计了一套集农田土壤温湿度监测、泵和电磁阀控制、远程管理的灌溉远程监控系统.该系统以433 MHz频率为核心开发无线传感器网络节点,完成农田土壤温湿度实时监测.基于ARM9微处理器S3C2410构建基站,对比已存储在数据库中的限值,由基站控制泵和电磁阀的启闭,并通过GPRS无线传输方式进行灌溉系统的远程实时监控,远程监控中心采用Citect组态软件实现数据、人机界面管理.试验中,选用4组无线传感器网络节点,分别测得25 cm深度土壤的温度和湿度,数据采样时间间隔为30 min,基站根据土壤信息控制泵与阀门的开闭,并通过GPRS无线网络传输至远程监控中心.试验表明系统使用灵活、功耗低、人机界面友好,能较好地满足农田灌溉远程监控的应用需求. 相似文献
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Overland water and salt flows in a set of rice paddies 总被引：1，自引：0，他引：1
E. Playn O. Prez-Coveta A. Martínez-Cob J. Herrero P. García-Navarro B. Latorre P. Brufau J. Garcs 《Agricultural Water Management》2008,95(6):645-658
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. 相似文献
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车用发动机润滑油失效规律与更换周期研究 总被引：7，自引：0，他引：7
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。 相似文献
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赵国杰 《农业机械化与电气化》2011,(4):106-107
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。 相似文献
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苑庆刚 《农业机械化与电气化》2010,(3):52-54
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。 相似文献
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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。 相似文献
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对《种子法》存在问题的探讨 总被引：1，自引：0，他引：1
李鹏 《农业机械化与电气化》2011,(6):129-130
《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。 相似文献
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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。 相似文献
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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。 相似文献
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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. 相似文献