搜索结果: 1-15 共查到“农业生物物理学 method”相关记录27条 . 查询时间(0.265 秒)
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
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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...
基于紫外指纹图谱技术的食醋品种检测方法（Method of Vinegar Detection Based on Ultraviolet Fingerprint Technology）
食醋 检测 紫外光谱
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2009/5/22
以不同食醋为研究对象，采用旋转蒸发、紫外光谱扫描等手段研究了波长范围、蒸发液稀释比例、蒸发温度和参比液质量浓度等对食醋紫外吸收曲线的影响，确定了食醋紫外指纹图谱检测方法的试验条件：扫描波长范围245～330nm，蒸发液稀释比例1∶6，蒸发温度45℃，冰醋酸参比液质量浓度45g/L。以曲线间的相似度为指标验证了方法的重现性、稳定性和差异性，结果表明：各个食醋样品3次重复测定的指纹图谱间相似度均大于0...
Acoustic emission as a method for the detection of fractures in the plant tissue caused by the external forces
acoustic emission stress strain plant tissue
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2008/11/26
In order to detect fractures in the plant tissue resulting from deformations, the method of acoustic emission has been applied. Simultaneous measurements of the mechanical parameters and the acoustic ...
A method for estimation of enzymatic browning and its suppression in apple slices
apple slices reflectance browning oxalate sulphite
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2008/11/26
A described method is based on diffuse light reflectance in the spectral region 400-720 nm for the examination of enzymatic browning of apple slices. In this method apples are sliced as directly dippe...
Assessment of phytosanitary treatments on different wheat species by a global method, the so-called thesigraphy
wheat pesticides global assessment method thesigraphy
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2008/11/26
An assessment test of phytosanitary treatments on 7 wheat species was carried out in Auvergne (France) through a global method - the thesigraphy. This analysis consists of making and decoding images o...
Effect of fertilization method on the uptake and accumulation of mineral components in the initial period of maize development
maize fertilization uptake mineral components
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2008/11/24
On the basis of a 4–year study, the effect of fertilization methods on the uptake and accumulation of mineral components by maize was evaluated. Two methods were used: by broadcasting over the whole s...
Importance of wheat grain orientation for the detection of internal mechanical damage by the X-ray method
wheat grain internal damage roent-genograph projection grain and sample orientation
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2008/11/24
In the present work some methodical aspects of X-ray detection of wheat kernels are presented. Part of the work describes the optimal kernel orientations using a special X-ray instrument attachment. T...
Some methodological aspects of determining wet gluten quality by the glutomatic method (a laboratory note)
wheat wet gluten gluten index determination glutomatic system
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2008/11/24
One of the weak sides of the glutomatic method for testing wet gluten quality (ICC Standard No. 155) is a variable amount of wet gluten subjected to the action of the centrifugal force as various amo...
Comparison of daily evapotranspiration rates obtained from water balance model and modified Bowen`s ratio method
evapotranspiration modelling Bowen`s ratio method
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2008/11/21
The processes of energy and water exchange between the earth surface and atmosphere have a very significant influence on the microclimatic conditions and consequently, on plant production. Evapotransp...
Effect of penetration resistance, bulk density and moisture content of soil on selected yield components of winter triticale in relation to method of cultivation
penetration resistance moisture soil bulk density yield components
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2008/11/20
The influence of penetration resistance, bulk density and moisture content of soil on winter triticale crop yield was investigated. The crops were grown on land that had not been cultivated for severa...
Error analysis of water conductivity coefficient measurement by instantaneous profiles method
water conductivity instantaneous profiles method error analysis
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2008/11/19
The objective of the study is the calculation of the maximum absolute and relative measurement errors of the water conductivity coefficient determined by the instantaneous profiles method in the soil ...
Quantitative method for determining cell structural parameters of plant tissues
cell structural parameters image analysis parenchyma tissue of potato tuber
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2008/11/18
The present work focuses on a method for quantitative evaluation of cell structural parameters of plant tissues such as: surface area, perimeter, Feret's diameters, elongation. The method is based on ...
Non-destructive method for internal quality determinationof belgian endive (cichorium intybus l.)
non-destructive method quality Belgian endive (Cichorium intybus L.) floral spike X-ray
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2008/11/17
A method and process were developed to nondestructively measure the length of the floral stalk in Belgian endive Cichorium intybus L. Current X-ray technology proved to be a feasible method. A detecti...
Improved method of wheat starch isolation for friabilin analysis
wheat hardness starch granules friabilin fractionation
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2008/11/14
Starch granules were isolated from two types of wheat grain: Triticum durum (one sample) and Triticum aestivum (two varieties). Prime starch was fractionated according to the method described by Wolf ...
Iodometric method of the determination of the exposed damage surface of cereal grain
cereal grain mechanical damage io-dometry area of exposed grain endosperm surface
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2008/11/14
In this paper, a method for determining the area of the exposed damage surface of grain endosperm by means of the amperometric measurement of iodine adsorption has been presented.According to the ampe...