坐水播种注水水柱对沟底冲击压强信号的采集及分析方法

穴灌坐水播种最大的难点就是种子与穴施水在播施过程中难以同位,提出了同步信号自动控制的穴施水机构,试验表明其种液同位合格率达97.8%,较好的解决了种液同位问题,但是作业过程中发现有施水飞溅现象,同时种子随穴灌水流在沟内运动随机,快速作业时更突出,影响了施水与播种质量。要解决这一问题、彰显穴灌坐水播种的优势就必须正确认识灌溉冲击水柱在沟内的水力特性,特别是灌溉水注对种沟沟底的冲击压力特性。针对以上问题,提出利用计算机直接测试装置对灌水冲击压力进行样本数据采集,给出了信号采集的方法及系统组成,并对信号采集过程中采样频率、采样次数等的确定及信号在时域、频域内的相关分析方法进行了研究。     

面向水产农业的大数据技术应用分析与对策

伴随“农业4.0”概念的出现,新兴的大数据、互联网、云计算等技术成为迈向“农业4.0”的核心。水产农业是农业的重要组成部分,水产农业+大数据已被众多专家和企业认可为水产农业升级的必由之路。基于此,本文对相关问题进行了总结和探讨,并提出了水产农业经营的新模式。     

入境旅游对中国区域经济发展的溢出效应分析

通过国外游客的旅游消费带动地区经济的增长是旅游刺激经济的一种溢出效应.以此为基础,通过构建国外游客入境旅游消费与地区经济增长关系的面板数据模型进行实证分析,结果发现:不同地区的外国游客入境旅游消费对经济增长具有不同的溢出效应,这种溢出效应能促进北京、河北、内蒙古、安徽、广东、四川、贵州和新疆等省市的经济发展,但却恶化了天津、上海、重庆、云南、陕西和甘肃等省市的经济发展.笔者最后提出了促进国外游客入境旅游消费对地区经济增长拉动作用的建议.     

Agronomic data: advances in documentation and protocols for exchange and use

Data from agronomy experiments are typically collected and stored in a number of minimally documented computer files, with additional information being entered and archived in field books or diaries. Data manipulation is generally cumbersome and error-prone, and data loss is frequent. Modern database technology has the potential to resolve these issues. However, experience gained by an international network of experimenters and crop modellers (the International Benchmark Sites Network for Agrotechnology Transfer; IBSNAT) in using a database for agronomic experiments conducted by many workers at different sites highlighted problems of data entry, quality control, and changing requirements for storage and output variables. In an attempt to minimize these problems, IBSNAT reduced its focus on a central database, but considerably enhanced its effort on the design and use of a set of simple, standard experiment documentation and results files that could be established and edited easily, transferred directly among workers, used as inputs to analytical software and crop models, and read by database and spreadsheet software. The standard files which were developed, and which were used in a software package termed DSSAT V3, have recently been upgraded by a consortium of experimenters and modellers (the International Consortium for Agricultural Systems Applications; ICASA). These new files are described briefly here. The ICASA files constitute an advance in the potential for good documentation and storage of agronomic data, but only partly solve the problem of overall data management and use. There is still need for central and local databases that facilitate both the searching of information from different experiments, and the examination of relationships that may be apparent in a large array of data. A number of such databases have been developed for specific applications, and a few of these are briefly touched upon. In particular, recent work with one large database currently being developed by a number of international Agricultural Research Centers, National Research Organizations, and Universities, (the International Crop Information System, ICIS), is briefly described.     

网络化虚拟仪器技术及其在汽车测试系统中的应用

介绍了网络化虚拟仪器的概念,总结了目前组建网络化虚拟仪器的模式,重点研究了网络化虚拟仪器技术在汽车底盘测功机上的应用及其实现方法。     

Changes in shorebird behaviour and distribution associated with an intertidal crab fishery

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