搜索结果: 1-15 共查到“农业工程 crop”相关记录16条 . 查询时间(0.109 秒)
Crop plan optimization under risk on a farm level in the Czech Republic
crop plan crop rotation constraints optimization stochastic programming.
2014/3/31
The precise agricultural operations research models claiming complex solutions and specialized software tools may appear too complicated to truly support the decision making process on the farm level....
USE OF EARTH OBSERVATION FOR GEOSPATIAL CROP WATER ACCOUNTING OF RAIN-FED AGRO-ECOSYSTEM IN INDIA
Earth observation seasonal phenology WRSI rain-fed agro-ecosystem crop yield
2014/5/6
Use of earth observation by means of remote sensing and in-situ meteorological network in integrated manner have improved ability to track water availability and associated yield reduction in rain-fed...
便携式作物氮素监测仪性能水稻田间测试（Evaluation of Portable Crop Nitrogen Monitoring Instrument Based on Rice Field Experiment）
水稻 氮素含量 监测仪
2010/12/29
设计了2个品种和4个施氮水平的水稻田间试验，采用自行研制的便携式作物氮素监测仪获取各关键生育期的水稻冠层反射光谱信息，并实施田间协同取样和实验室氮素含量测定。通过分析水稻叶片氮含量与冠层光谱反射率及植被指数之间的相关性和定量关系，测试并评价便携式作物氮素监测仪的工作性能。结果表明，便携式作物氮素监测仪具有优异的氮素监测效果和优良的田间工作性能，在其所具备的4个特征波段中，660、710和810n...
基于最小二乘法的早期作物行中心线检测方法（Early Stage Crop Rows Detection Based on Least Square Method）
农业机械 导航 机器视觉 图像分割
2010/12/29
提出了一种基于最小二乘法的早期作物行中心线检测算法。利用G-R颜色特征因子分割作物与背景。根据作物与杂草的长度属性去除部分杂草噪声，应用垂直投影法动态检测作物行数，并提取作物行中点为特征点，获得特征点图像。利用特征点间的邻近关系对特征点进行分类,对归类后的特征点进行两次最小二乘法拟合，得到作物行中心线。对于有作物缺失的作物行，采用统计条形区域内特征点数量的方法判别检测结果的可信度。实验结果表明，算...
农作物喷雾靶标自动探测器设计与应用（Design and Application of Crop Automatic Target Detection Device）
作物 目标探测 对靶喷雾 红外辐射
2010/12/28
针对当前红外探测控制系统易受外界环境因素干扰、通用性差的缺陷，采用双红外发射、优化光路、增加接收面积，对红外靶标自动探测系统的光学部分进行了改进，并将整体探测装置改进为独立分体单元，增加了红外靶标自动探测装置的可移植性和通用性。试验结果表明：探测距离提高了48.96%，靶标间距识别的灵敏度提高了12.04%。
基于辐射照度的作物冠层光分布计算系统设计（Calculation System of Light Distribution within Crop Canopy Based on Radiosity Method）
作物冠层 辐射度 光分布 模拟
2009/11/3
以玉米为例，使用C++语言和OpenGL图形函数库，在Windows平台下，开发基于辐射度-图形学结合模型（RGM）的作物冠层光分布计算系统。以相对成熟的RGM方法提取模型参数，并针对作物冠层特点对方法做适当改进。在冠层三维模型基础上，通过用户交互指定参数，可计算出冠层内每个面元的光分布状态。该系统所需模型参数少，且参数均具有较为明确的植物学和农学意义，便于与传统作物模型相结合，操作界面友好、使用...
基于光谱学原理的无损式作物冠层分析仪（Non-destructive Crop Canopy Analyzer Based on Spectral Principle）
作物冠层 氮含量 分析仪
2009/11/3
设计了可以对作物氮含量进行实时监测的作物冠层分析仪。分析仪由传感器与控制器组成，通过无线方式进行数据传输。传感器包含光学部分和电路部分，光学部分包含4个光学通道和光电探测器，其中2个通道分别在610nm与1220nm处测量太阳辐射光，而另外2个通道在同样的2个波段上测量作物冠层的反射光；电路部分主要由电源、放大单元和无线传输模块组成。控制器内除了无线传输模块外，周边还集成了键盘、液晶显示、数据存储...
Agriculture Feeds and Saves the World--Nuclear Techniques Used to Tackle Global Warming and Increase Crop Productivity
Agriculture Nuclear Techniques Global Warming Crop Productivity
2009/9/28
Experts say that healthy, properly managed agricultural land increases crop yield and can contribute significantly to the reduction of harmful greenhouse gases like carbon dioxide, methane and nitrous...
基于改进Hough变换的农田作物行快速检测算法（Rapid Crop-row Detection Based on Improved Hough Transformation）
作物行检测 机器视觉 直方图投影
2009/8/11
期农田作为研究对象，采集了包含行栽作物和土壤背景的农田图像，针对现有作物行定位方法易受外界干扰和处理速度较慢的不足，提出将投影法和直接Hough变换法相结合检测作物行的算法。采用2G—R—B法和OTSU法将图像二值化，通过快速中值滤波算法去除噪声，再利用垂直直方图投影将图像进行水平条划分获取作物垄平均定位点，最后通过Hough变换检测垄定位点，得到作物行中心线。试验结果表明：基于垂直直方图投影的H...
玉米收获机组合式指形拨禾机构设计与仿真（Design and Simulation of Compounding Crop Divider with Finger Rotor）
玉米收获机 拨禾机构 设计
2009/5/19
玉米不分行收获的技术关键是如何实现茎秆的有效导入。在分析现有不分行玉米收获机割台结构的基础上，对指形拨禾机构提出了改进方案，将拨茎轮和拨穗轮独立安装，拨穗轮靠近螺旋输送器。拨茎杆为直杆，拨穗杆为弯杆，两者偏心安装方向相反，转动方向相同。拨穗轮后移，可改善对果穗的输送效果，避免与拨茎杆发生干涉。改变拨茎杆的偏心方向，可增强对茎秆的拨送能力，增加拨禾的有效范围，从而提高了对不同玉米行距的适应性。通过对...
Assessing Crop Water Stress and Irrigation Scheduling in Cotton Through Use of Infrared Thermometry Technique
Crop Water Stress Irrigation Scheduling Cotton Infrared Thermometry Technique
2009/1/22
Crop Water Strees Index (CWSI), based on canopy temperature which can be measured through use of an infrared thermometer, can be used to quantify crop water stress. However, the use of this index on f...
Comparison of Irrigation Performance Based on the Basin, Crop Pattern, and Scheme Sizes Using External Indicators
Irrigation scheme comparative indicators basin crop pattern scheme size
2009/1/13
A comparative assessment allows screening of irrigation systems based on the key issues relative to performance and indicates where improvements should be made, such as in type of management, infrast...
Nitrogen conversion and nitrous oxide hot spots in energy crop cultivation
nitrogen fertilisation level N2O soil flux cultivated and non-cultivated soils perennial and annual plants
2014/2/27
Since 1999, nitrous oxide (N2O) soil emissions from sites cultivated with energy plants have been measured by gas chromatography and gas flux chambers in experimental fields. The main aim of this stud...
Parametres of energy crop biomass handling
handling energy crops renewable resources biomass
2014/2/27
Energy crop handling can be performed with standard handling machinery equipped with suitable adaptors. The authors describe and compare various types of handling of wood and herb energy crops. The pu...
The plane interaction theory of the cleaning vane with the head of a root crop
flexible cleaning vane head of root crop plane motion differential equation interaction
2014/2/26
New interaction theory of a flexible cleaning vane with the head surface of root crop in the case when the vane installed on the driving shaft makes a plane motion is proposed. Based on the obtained d...