高港泵站水利枢纽自动化系统

详细介绍了江苏省泰州引江河高港泵站水利枢纽自动化系统的功能，介绍了系统采用的分布式体系结构、设备分布及其功能分配。     

泵站配电变压器优化选型设计研究

根据泵站排涝运行特点，从降低变压器损耗入手，采用综合经济比较等优化选型方法，从初选的三种系列变压器方案中优选出最佳方案，以取得良好的综合效益。     

灌区评估指标的选取及灰关联分析

该文探讨了灌区评估指标体系的建立方法,对评估指标的选取与预处理进行了系统分析,并尝试应用灰色系统理论中的灰关联度分析法,对灌区评估指标进行关联分析,从而很方便地进行灌区之间的评估、排队及比较,与传统的强制打分法相比,此法简便易行,无需预先建立评判标准,因此是一种新的评估分析法。     

Using drainage systems for supplementary irrigation

The use of drainage systems for supplementary irrigation is widespread in The Netherlands. One of the operating policies is to raise the surface water level during the growing season in order to reduce drainage (water conservation) or to create subsurface irrigation. This type of operation is based on practical experience, which can be far from optimal.To obtain better founded operational water management rules a total soil water/surface water model was built. In a case study the effects of using the drainage system in a dual-purpose manner on the arable crop production were simulated with the model. Also, the operational rules for managing this type of dual-purpose drainage systems were derived.The average annual simulated increase in crop transpiration due to water conservation and water supply for subsurface irrigation are 6.0 and 5.4 mm.y^–1, respectively. This is equivalent with 520 × 10³ and 460 × 10³ Dfl.y^–1 for the pilot region (2 Dfl 1 US $). The corresponding investments and operational costs are 600 × 10³ Dfl and 9 × 10³ Dfl.y^–1 for water conservation and 3200 × 10³ Dfl and 128 × 10³ Dfl.y^–1 for subsurface irrigation. Hence, water conservation is economically very profitable, whereas subsurface irrigation is less attractive.Comparing the management according to the model with current practice in a water-board during 1983 and 1986 learned that benefits can increase with some 50 and 500 Dfl per ha per year, respectively.     

我国农业基础设施投资存在的问题及对策

随着我国经济的发展,政府越来越重视农业的投资问题,并充分认识到加大对农村基础设施的投资是建设现代化农业的关键,但我国财政对农业基础设施的投资与城市比较还存在很大差距.为此,以我国农业基础设施投资的现状和存在问题为着眼点,分析了加强农业基础设施投资的措施.     

葡萄干彩色图像的背景分割研究

背景分割是分析葡萄干其他特征的基础。为此,经研究提出一种改进的迭代算法,用来获取葡萄干灰度图像阈值;基于RGB阈值法与亮度阈值法,对葡萄干进行背景分割后的图像分析比较,证明亮度阈值法能较好地进行葡萄干彩色图像背景分割,保存图像的颜色信息。     

搅拌机的研制

介绍了搅拌机最基本的设计步骤,首先确定了执行机构的运动机构,确定四杆机的长度,验证是否合适;验证曲柄存在的条件,检查连杆是否干涉,验证四杆机构的传力性能以验证四杆机构是否有较高效率;计算出溶液阻力从而列出力矩平衡方程求出平衡力,求出阻力矩,利用阻力矩与等效驱动力矩之间的关求出最大盈亏功,从而确定飞轮惯量;最后确定了电动机的功率。     

旱地全膜双垄沟残膜捡拾机的设计

针对我国西北旱地全膜双垄沟残膜捡拾机仿形能力差、拾净率低的问题,设计了一种旱地全膜双垄沟滚筒式残膜捡拾机。同时,阐述了整机结构及工作原理,并通过机构分析和计算确定了关键部件工作参数,旨在为残膜回收提供一种新的机具。     

叶用型沙棘育种研究--“蒙×中”沙棘F1代雄株变异特性与选优标准的研究

通过对蒙古沙棘亚种优良品种与中国沙棘亚种优良类型F1代雄株的变异特性分析,建立了选择优 良单株的标准,为叶用型沙棘选择育种提供了科学依据。     

我国农业水资源可持续利用面临的问题与对策

分析了我国农业水资源分布特点，从可持续发展角度论述了农业水资源存在着供需矛盾日益突出、污染和超采严重、地下水位和水质下降、农业用水效率低且浪费严重等问题，提出了实施农业高效用水技术、控制污染保护生态平衡、污水、海水、雨水资源化以及区域水资源调度等解决对策。