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对河南18个县市烤烟C3F氨基酸的含量进行分类研究,运用主成分分析法与系统聚类法分别对不同地区烤烟的氨基酸含量进行分析。主成分分析结果表明,Phe、Gly与Ser等中性氨基酸对烤烟17种氨基酸的研究有比较大的影响,当欧氏距离为3.03时,系统聚类将河南18个县市划分为4类。建立适合主成分分析法与系统聚类模型对河南不同地区烤烟氨基酸含量的研究是比较有意义的。 相似文献
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【目的】烟叶烘烤的阶段判别对提升烘烤效率和品质具有重要意义,亟须实现烟叶烘烤阶段自动判别,减少人为影响,提高判别准确率。【方法】首先,使用图像处理技术将图像均衡化,再裁剪并剔除含背景信息多的图块,筛选出有效信息最多的图块;其次,提取烤烟图块的颜色特征,提取每一个图块的HSV三通道值,得到i项通道值;最后,使用基于阈值筛选的方法作为特征处理器,根据不同h、s、v值分类出烟叶烘烤的阶段,并将判断结果与实际情况进行对比验证。【结果】使用图像均衡化处理技术结合基于HSV颜色空间的特征提取算法,进行烟叶烘烤阶段判别,最终整体准确率达到90.64%,并且阶段3和阶段4的准确率达到了100%,效果非常理想。【结论】使用图像处理技术结合图像本身的颜色特征,能有效地判别烤烟的烘烤阶段,对判断烘烤进程、指导烘烤参数调节、提高烘烤品质、减少物料浪费和烘烤成本具有实际意义,有着广阔的应用前景。本研究为后续绕过深度学习等大算力算法但能提高实际应用效果方面的研究提供了方向。 相似文献
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发动机连杆轴承故障噪声诊断研究 总被引：6，自引：1，他引：5
提出了基于小波包和模糊聚类分析的连杆轴承故障的噪声诊断方法。在EQ6100型发动机上预先模拟连杆轴承故障,根据发动机故障时变、非平稳的特点,运用小波包对发动机噪声信号进行特征提取并削减了背景噪声的影响。选取时域上5个参数作为评价故障的特征指标。通过对模糊聚类理论方法的分析比较,引入模糊C-聚类划分理论及方法对噪声信号的指标样本进行分类,得到最优分类矩阵和聚类中心,从而建立了故障的标准类型样本。通过对新测取的噪声信号样本进行检验,证明该方法能有效地判断待检样本的类型,诊断连杆轴承故障。 相似文献
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通过应用类平均法、系统聚类法，研究了阳泉市郊区23个谷子品种之间的相互关系，并进行类别划分：应用模糊数学分析法对23个品种的12项形状指标进行综合分析，确定了其利用价值。 相似文献
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基于FCM离散化的粗集权重在粮虫可拓分类中的应用 总被引：2，自引：0，他引：2
粮虫的识别属于参数多、混合度大的分类问题,特征客观权重的自动确定是粮虫可拓分类中的重要环节.提出了用聚类数评价函数自适应确定聚类数目,用FCM进行聚类分析,并依据最大隶属度原则对实值特征进行离散化处理.引入粗集理论中属性重要度的概念,自动确定粮虫特征的客观权重,并对粮仓中危害严重的9类粮虫进行了可拓分类,识别率达到93%,证实了基于FCM离散化的粗集权重在粮虫可拓分类中应用的可行性. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性，认为在缺水不可避免的情况下，对供水进行优化调度可以减小缺水带来的损失，产生较好的减灾效益，特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性，提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献