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基于PCA_SVR的油菜氮素光谱特征定量分析模型（Rape Nitrogen Content Spectral Character Models Based on PCA_SVR Method）
油菜 氮素 光谱分析
2009/5/22
研究了采用光谱分析技术对油菜植株全氮进行定量分析的方法。采用逐步回归法对氮素的光谱特征波长进行选择，为克服光谱变量间多重共线性的影响，对变量进行了主成分分析（PCA），为提高模型的拟合优度，应用支持向量机回归(SVR)建立油菜氮素的定量分析模型。对不同氮素水平的油菜冠层光谱数据进行分析，结果表明，406、460、556、634、662、675nm的光谱反射率与油菜含氮量呈极显著相关。植株全氮SVR...
脐橙VC含量近红外光谱消噪小波优化（Wavelet Optimization for Near-infrared Spectra Denoising of Vitamin C Content of Umbilical Orange）
脐橙 近红外光谱 小波基
2009/5/22
运用db1～db10等10个小波基4尺度分解对120个赣州脐橙样品的近红外光谱进行消噪处理，分别建立了各种小波消噪光谱的脐橙维生素C(VC)含量的PLS模型。通过PLS模型预测精度比较表明：所有db小波基变换都能有效消除脐橙VC近红外光谱噪声，PLS模型预测精度均高于不处理光谱建立的模型预测精度。其中，消噪效果最好的小波基是db5，模型预测值与实测值的相关系数R达到0.9427、内部交叉验证均方差...
Model study of the effect of barley grain moisture content on the distribution of horizontal and vertical pressures in a silo
barley moisture content silo pressure
2008/11/26
This study presents the results of the measurements of horizontal and vertical pressures in a silo, performed for dry barley grain with a moisture content of 13% d.b. and compares those results with t...
Model study of the effect of barley grain moisture content on the distribution of horizontal and vertical pressures in a silo
barley moisture content silo pressure
2008/11/26
This study presents the results of the measurements of horizontal and vertical pressures in a silo, performed for dry barley grain with a moisture content of 13% d.b. and compares those results with t...
Effects of moisture content of grain layers and their arrangement in the silo on the temperature and pressure distribution
cereals silo temperature pressure distribution
2008/11/26
In the present paper, results of temperature and pressure measurement of some cereals (triticale, rye, oat) along with the vertical silo wall were presented. Laminar filling of the silo with layers o...
Effects of temperature and moisture content on the strength properties of African nutmeg (Monodora myristica)
deformation failure stress strain energy
2008/11/26
The effect of temperature and moisture content of African nutmeg seed coat was studied as it affects compressive force, deformation, failure stress, strain energy and modulus of elasticity (firmness)....
Effect of aggregate size on the water content estimated with time domain reflectance (TDR)
TDR calibration aggregated soil
2008/11/24
Time domain reflectance (TDR) gives reliable estimates of the water content of structure-less soil. The effect of soil structure on the performance of TDR has received relatively little attention in c...
Some physical properties and cracking energy of conophor nuts at different moisture content
Conophor nuts Tetracarpidium conophorwn cracking energy moisture content physical properties
2008/11/24
Freshly harvested conophor fruits (Te-tracarpidium conophorwn) were processed traditionally and the nuts extracted. Physical measurements of axial and radial diameters, nut weight and volume were take...
Some physical properties of wild pistachio (Pistacia vera L.) nut and kernel as a function of moisture content
wild pistachio nut kernel physical properties
2008/11/24
In order to design equipment for improved processing of wild pistachio (Pistacia vera L.), some of the engineering properties were determined as a function of moisture content. The average length, wi...
Colour of paprika powders with different moisture content
paprika powder colour moisture content
2008/11/21
The colour characteristics of paprika powder with different moisture contents were analysed. The colour, determined by using the CIELab colour system, was measured with a Minolta CR-300 tristimulus co...
Comparison of soil thermal properties in cultivated fields determined using soil water content measured by two methods
soil thermal properties soil water content TDR methods
2008/11/21
Results of the measurements of water content in the topsoil layer (1-6 cm) in fields with various crops obtained by gravimetric and reflectometric (TDR) methods have been used for the calculations of ...
Effect of mineral vs. biofertilizer on growth, yield, and essential oil content of fennel (Foeniculum vulgare Mill.)
Azotobacter chroococcum Azospirillum lipoferum Bacillus megatherium (Foeniculum vulgare Mill.)
2008/11/21
In field experiments during two successive seasons (2003-2004 and 2004-2005), the effects of biofertilization on growth, fruit yield, and oil composition of fennel plants were investigated. Applicatio...
Effect of moisture content of cereal grains layer on pressure distribution on silo wall
silo grain pressure distribution loisture content
2008/11/21
The paper presents the results of measurements of silo wall pressure during the storage of yheat, barley and oats grain. The study was conducted on a ;st station. The test silo was filled with two lay...
Effect of moisture content on crackability of bambara groundnutusing a centrifugal cracker
bambara groundnut shelling efficiency moisture content centrifugal impaction device
2008/11/21
One of the most tedious operations in processing bambara groundnut is the shelling operation. However, moisture content normally affects the handling and processing of agromaterials, such as nut shell...
Effect of moisture content on some physical properties of sheanut(Butyrospernum Paradoxum)
sheanut moisture content, physical properties
2008/11/21
The effect of moisture content on the physical properties of sheanut (Butyrospernum paradoxum) was determined to explore the possibility of developing its bulk handling and processing equipment. In th...