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Effect of moisture content on some physical properties of Canarium schweinfurthii Engl. fruits
sphericity area density porosity variety
2016/12/9
The effect of moisture content on some physical properties of three varieties of Canarium schweinfurthii Engl. fruits (small, large and long) was studied at 40.91%, 34.92%, 23.44%, 18.5% and 11.03% mo...
醋糟有机基质含水率的可见/近红外光谱检测(Detection of Moisture Content in Vinegar Residue Substrate Using Visible-near-infrared Spectroscopy)
醋糟 有机基质 含水率
2010/12/29
以醋糟有机基质为研究对象,采用便携式可见/近红外光谱仪采集了不同含水率基质样品(69个)的漫反射光谱,通过选择不同的光谱预处理方法并确定其主成分数,建立了基于偏最小二乘法(PLS)的醋糟基质含水率定量分析模型。结果表明,以滑动平均滤波(MAF)和一阶微分(FD)相结合作为原始光谱的预处理方法所建立的模型(主成分数为5)对基质含水率的检测效果较好,其校正模型和预测模型决定系数分别为0.9930和0....
面向车载式测量的土壤含水量与电导率复合传感器设计(On-the-go Measurement Oriented Combined Sensor Design for Soil Moisture Content and Electrical Conductivity)
复合传感器 土壤含水量 土壤电导率
2010/12/28
基于介电方法设计了符合车载测量要求的四环电极结构土壤含水量与电导率复合传感器。分别在NaCl电导率溶液、含水土样和混合土样中进行标定试验分析,结果证实了复合传感器的可行性。通过分析混合土样中含水量和电导率与传感器输出信号之间的相关性,分别建立土壤含水量与电导率的统计预测模型。
土壤墒情信息采集与远程监测系统(Remote Collecting and Monitoring System of Soil Moisture Content Information)
土壤墒情 远程监测 GIS GPS
2010/12/28
为提高传输距离和进行不间断连续监测,开发了土壤墒情信息采集与远程监测系统。详细讨论了系统的结构和原理,给出了系统的软硬件设计方案。系统利用太阳能进行充电,通过GSM网络进行土壤墒情数据无线传递,利用GPS系统进行采样点的卫星定位。通过GIS软件,系统能实时监测大面积区域内的土壤墒情状态并做出土壤墒情空间分布图。应用结果表明,该系统结构合理,可以为防旱、抗旱提供可靠的依据。
基于DSP的谷物含水率在线测量方法(Universal Online Measuring Method of Grain Moisture Content Based on DSP)
数字信号处理 谷物含水率 在线测量
2009/11/3
提出一种基于DSP的谷物含水率测量方法。谷物通过自身重力导入到测试腔内,由MCU和DSP为核心器件构成的测试系统对谷物含水率进行测量、存储,并通过LCD显示。经过测量的谷物,通过螺旋输送器排出,进行下一步测量。系统通过DS18S20温度传感器对谷物温度进行测量,并对温度予以补偿。该方法可使谷物含水率测量误差低于1%,优于常规测量方法。
小麦拔节期农学参数和土壤含水量空间统计(Spatial Statistic Properties of Agronomic Parameters and Soil Moisture Content in Wheat Jointing Stage)
冬小麦 农学参数 土壤
2009/11/3
选取山东省陵县的小麦试验示范基地作为样区,采用GPS定位调查,获取田间21个样点的土壤和小麦植株样品,运用TDR300测定样点土壤含水量,利用SPAD-502叶绿素仪测定采样点拔节期小麦植株叶片的叶绿素含量,获取小麦干物质产量信息。基于地统计学原理,结合空间分析技术,探讨了小麦叶绿素含量、干物质产量等农学参数信息和土壤含水量的空间变异特征。研究结果表明,土壤水分和小麦叶绿素含量的空间变异呈强的空间...
Effects of moisture content, internode position and loading rate on the bending characteristics of barley straw
barley moisture content loading rate bending stress Young’s modulus
2014/2/26
This study was conducted with the aim to evaluate the effects of the moisture content, internode position, and loading rate on the bending characteristics of barley straw including bending stress and ...
Effects of moisture content, loading rate, and grain orientation on fracture resistance of barley grain
barley grain mechanical properties fracture resistance grain processing
2014/2/26
Force and deformation curves of agricultural materials must be provided for the proper design of harvesting and processing machineries. In this research, the fracture resistance of barley grain was me...
Influence of moisture content on pressure ratio of rape seeds
pressure ratio granular material rape seed model silo
2014/2/28
The pressure ratio of rape seeds was determined for four levels of moisture content in a model silo. The silo was 0.6 m in diameter and 0.6 m high. Ratio of horizontal to vertical pressure and distrib...