搜索结果: 1-15 共查到“知识库 农业工程 determination”相关记录21条 . 查询时间(0.14 秒)
Revised Determination of the Rainfall-runoff Erosivity Factor R for Application of USLE in the Czech Republic
water erosion storms rainfall erosivity factor USLE
2015/1/28
The evaluation of a series (1961–2000) of ombrographic records from 13 selected stations of Czech Hydrometeorological Institute provided long-term annual summation values and annual peaks of the rainf...
Determination of oxygen permeability and mechanical properties of the aluminium paper foils
packaging modulus of elasticity butter curd
2014/11/28
The paper deals with the determination of the oxygen permeability and mechanical properties of butter and curd aluminium paper foils Radaflex applied in the food packaging. Foil Radaflex is a paper fo...
微量有机磷农药残留近红外光谱快速检测方法（Determination of Organophosphorus Pesticide Residue by Using Near-infrared Spectroscopy）
有机磷农药 近红外光谱 偏最小二乘回归法
2010/12/28
以滤纸作为农药载体，在波数4000～10000cm-1范围内获取其近红外光谱曲线。分别采取偏最小二乘回归法和最佳波段差值回归法建立农药质量比的预测模型。偏最小二乘回归法在经过多元散射校正和变量标准化预处理后得到的预测结果较好，预测相关系数为0.954，通过最佳波段差值回归法得到的预测相关系数为0.904。两种建模方法都得到了较好的预测结果。
An ultrasound based technique for the determination of poultry egg quality
phase velocity poultry egg quality ultrasound freshness
2014/2/26
The present study investigates the possibility of the non-destructive prediction of the main quality indices of commercial eggs by calculating the ultrasound phase velocity within the egg material. Th...
The usage of CAN-Bus messages for engine power determination
actual engine torque engine tractor engine power CAN-Bus
2014/2/26
Determination of the actual power of tractor's engine in the operation can be done by calculation which requires the use of a range of parameters such as coefficient of rolling resistance, mechanical ...
番茄果实热导率测试装置参数实验（Optimization of the Parameters of Designed Apparatus for Determination of Thermal Conductivity of Tomato Fruits）
番茄 热导率 测试装置 操作参数
2009/11/3
微热探针法测试热导率系统已被广泛应用于食品材料热导率的测试中。但是，由于实验条件或实验设备的限制，基于理想的线热源瞬态模型测量原理得到的结果会产生某些测试误差。针对测试误差，从探针输入电压、加热时间和样品的径向尺寸等装置操作参数的选择着手，通过实验，得到装置系统测定中输入电压的最佳值为2.5～6.5V、加热时间最佳值为20～50s。最后通过实际测试，得到了番茄果实在不同成熟阶段的热导率变化规律。
基于加权模糊聚类的农田养分管理区划分（Determination of the Soil Nutrient Management Zones Based on Weighted Fuzzy Clustering）
精细农业 农田养分 加权模糊聚类
2009/11/3
将加权模糊聚类算法应用于管理区划分，权值的确定分别采用主成分分析法和变异系数法。在吉林省榆树市精细农业试验田获取土壤氮、磷、钾数据，应用本文提出的加权模糊聚类算法进行管理区划分,确定了试验区的管理分区数目,并与传统的模糊聚类方法进行了比较。结果表明，基于加权模糊聚类的管理分区更合理、更符合实际情况，该方法可用于指导精准施肥。
苹果内部品质近红外光谱检测的异常样本分析（Outlier Sample Analysis on Near Infrared Spectroscopy Determination for Apple Interior Quality）
苹果 无损检测 异常样本 近红外光谱
2010/2/26
应用声光可调谐滤光器近红外光谱仪检测苹果内部品质（可溶性固形物含量、总糖、总酸和硬度）时，综合利用Cook距离、马氏距离、杠杆值和学生化残差，判断疑似异常样本点，然后用二审剔除判别法确定异常样本点。最终可溶性固形物含量、总糖、总酸模型都剔除了11个异常样本，硬度模型剔除了6个异常样本。其偏最小二乘回归模型的相关系数分别从0.868、0.791、0.443、0.693提高到0.904、0.849、0...
稻谷千粒质量近红外光谱定量分析（Determination of 1000-grain Weight of Paddy Using NIRS Technique）
稻谷 千粒质量 近红外光谱
2009/8/11
利用近红外漫反射光谱分析技术对稻谷千粒质量进行了测定和研究。通过对70个不同品种的稻谷样本进行近红外光谱扫描，将获得的光谱进行10种不同方法的预处理，然后应用PLS方法建立稻谷千粒质量预测的定标模型，根据交互验证决定系数（R2）和交互验证标准差（RMSECV）进行最佳定标模型选择，最后依据稻谷千粒质量预测值与真实值间的相关系数（r）和预测标准误差（SEP）进行模型预测能力评价。结果显示，在光谱区间...
低扬程泵变速工况性能及合理变速范围的确定（Low-head Pump Performances and Determination of Reasonable Scope for Variable Speed Operation）
泵 性能预测 变速运行
2009/5/22
根据南水北调工程中低扬程泵站采用变速运行的具体特点，研究了变速工况下泵装置性能的变化规律，指出在装置净扬程大于零的情况下，传统的水泵相似律不再适用于变速工况下的装置特性换算，提出了采用泵特性线性化和额定转速下装置特性预测变速工况下性能参数的方法。在引入“能耗比”的概念后，对一定时间段调水量恒定条件下的变速运行与其他调节方式的能耗进行了分析。在考虑变速装置效率、电动机效率和不同转速下泵效率变化下能耗...
Loading capacity determination of the wooden scarf joint
Mohr’s circles linear state of stress bonding scarf joint wooden joint
2014/2/26
The paper describes the complete derivation of the theoretical bonded scarf joint loading capacity and the construction of the Mohr’s circle for linear state of stress. Then the method of the experime...
水稻氮素机器视觉诊断最佳叶位和位点的选择研究（Determination of Suitable Leaf for Nitrogen Diagnosis in Rice Based on Computer Vision）
水稻 氮素 机器视觉 叶位 位点 变异系数
2010/5/5
选用扫描仪获取水稻叶片的数字图像，通过比较第1和第3完全展开叶 (L1和L2) 颜色参量的空间分布，研究基于机器视觉技术的水稻氮素诊断的最佳叶位和位点选择。结果表明基于机器视觉的水稻氮素营养诊断是有理论依据的，能反映出叶片的营养状况; 选择B、b、b/(r+g)、b/r、b/g作为最优颜色特征参量；比较颜色特征参量对应的变异系数CV，得到低氮处理的CV明显高于正常氮素水平，同时CV随着叶位的增...
Determination of Emitter Spacing Based on the Amount of Water Applied and Trickle Discharge Rates
Emitter Spacing Water Applied Trickle Discharge Rates
2009/1/23
This study was conducted with the objectives of determining effect of trickle discharge rates and amount of irrigation water applied on water distribution in the soil profile and to estimate the emitt...
Determination of Hydraulic Performances of In-Line Emitters
Hydraulic Performances In-Line Emitters
2009/1/22
The efficiency of trickle irrigation systems depends directly on the uniformity with which water is discharged from the emission devices throughout the system. Ideally, all emitters in the system shou...
Determination of the Amount of Irrigation Water and Interval for Cotton With the Pan-Evaporation Method
Irrigation Water Interval for Cotton Pan-Evaporation Method
2009/1/14
This study was conducted to determine the amount of irrigation water and interval of cotton irrigated by the drip system with the pan-evaporation method. The amount of irrigation water applied was ba...