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近红外光谱法田间快速估测新鲜紫花苜蓿品质 被引量:13
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作者 许瑞轩 李东宁 +3 位作者 杨东海 林建海 项敏 张英俊 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2013年第11期3010-3013,共4页
田间快速估测苜蓿品质对于适时刈割具有重要意义。试验共采集来自不同地域、不同品种、不同生育期和不同茬次的新鲜紫花苜蓿样170份,经便携式近红外光谱仪(1100~1800nm)扫描得到近红外光谱,利用偏最小二乘法(PLs)在国内首次建立... 田间快速估测苜蓿品质对于适时刈割具有重要意义。试验共采集来自不同地域、不同品种、不同生育期和不同茬次的新鲜紫花苜蓿样170份,经便携式近红外光谱仪(1100~1800nm)扫描得到近红外光谱,利用偏最小二乘法(PLs)在国内首次建立基于紫花苜蓿新鲜样品的干物质(DM)、粗蛋白(cP)、中性洗涤纤维(NDF)、酸睦洗涤纤维(ADF)化学分析值的近红外校正模型,探讨利用近红外漫反射光谱技术(NIRS)在田间快速估测紫花苜蓿品质的可行性,摸索设备选择和制样方法。四项指标所建模型的交互验证决定系数(尺Ev)分别为0.8314,0.5979,0.8036和0.7861;交互验证均方根误差(RMSECV)为1.2411,0.2614,0.9903和0.8306;外部验证决定系数(瞄)为0.8150,0.4011,0.7849和0.7521,外部预测均方根误差(RMSEP)分别为1.06,0.31,0.95和0.80。对于苜蓿鲜样来说,DM,NDF和ADF的近红外模型可以进行粗略的定量分析,CP的建模效果较差,但因苜蓿中的粗蛋白含量一般都能满足家畜需求,DM,NDF和ADF是在适时刈割中最关键的估测指标,DM,NDF和ADF模型可以满足田间快速估测苜蓿品质的要求。 展开更多
关键词 近红外漫反射光谱(NIRS) 新鲜紫花苜蓿 田间快速估测 品质 适时收获
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羊肚菌胞外多糖快速估测方法 被引量:2
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作者 陈莉 孙永海 +1 位作者 付天宇 丁健峰 《吉林大学学报(工学版)》 EI CAS CSCD 北大核心 2014年第2期567-572,共6页
针对羊肚菌深层发酵过程胞外多糖含量估测自动化关键技术问题,对发酵液的主要参数与胞外多糖相关性及其规律进行了分析,发现发酵液黏度、电导率与胞外多糖之间几乎不存在相关性。在0.01显著性水平下,发酵时间、发酵液浊度、残余还原糖... 针对羊肚菌深层发酵过程胞外多糖含量估测自动化关键技术问题,对发酵液的主要参数与胞外多糖相关性及其规律进行了分析,发现发酵液黏度、电导率与胞外多糖之间几乎不存在相关性。在0.01显著性水平下,发酵时间、发酵液浊度、残余还原糖与胞外多糖的相关性显著,相关系数均在0.7以上。在排除变量间的虚假相关后,只有发酵液浊度与胞外多糖的偏相关系数在0.8以上,可以认为发酵液浊度是描述胞外多糖的最佳参数。利用所获一元线性回归、二项式回归以及BP神经网络三种数学模型对胞外多糖含量进行的估测验证试验结果表明:BP神经网络模型的估测效果最好,估测方差仅为2.37×10-6。 展开更多
关键词 食品科学技术 胞外多糖 快速估测 羊肚菌深层发酵 BP神经网络
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快速估测棉花种子水分方法的研究 被引量:1
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作者 王万双 刘玉欣 刘志芳 《中国种业》 北大核心 2004年第6期29-29,共1页
关键词 棉花 种子水分 快速估测方法 高温烘干法 低温烘干法 种子检验
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发酵液中透明质酸含量的快速估测方法
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作者 宋磊 刘苗苗 +1 位作者 郭燕风 王宜磊 《食品工业科技》 CAS 北大核心 2020年第17期263-268,共6页
为快速估测出发酵液中透明质酸含量,对发酵液中透明质酸含量与菌体量、浊度、粘度、电导率、还原糖含量进行相关性分析及偏相关性分析,选择与透明质酸含量相关性最为显著指标构建一元线性回归、二次项曲线回归以及BP神经网络数学模型,... 为快速估测出发酵液中透明质酸含量,对发酵液中透明质酸含量与菌体量、浊度、粘度、电导率、还原糖含量进行相关性分析及偏相关性分析,选择与透明质酸含量相关性最为显著指标构建一元线性回归、二次项曲线回归以及BP神经网络数学模型,并对模型估测发酵液中透明质酸含量进行验证。结果表明:在显著性水平P<0.01下,发酵液浊度、电导率与透明质酸含量不存在相关性;菌体量与透明质酸含量存在虚假性相关;粘度及还原糖含量与透明质酸含量显著相关,系数分别为0.984、-0.869,粘度与透明质酸含量相关性最为显著,可作为估测发酵液中透明质酸含量的唯一指标;利用三种数学模型对发酵液中透明质酸含量进行估测验证表明BP神经网络模型的估测最为准确,方差仅为1.89×10^-2,通过测定发酵液粘度可快速准确估测出发酵液中透明质酸含量。 展开更多
关键词 透明质酸 发酵 快速估测 相关性分析 BP神经网络
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塑料种类快速估测 被引量:2
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作者 奚东 《塑料科技》 CAS 2000年第5期48-50,共3页
关键词 塑料 种类 鉴别 快速估测
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透明质酸发酵液中还原糖含量的快速估测方法 被引量:1
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作者 宋磊 刘苗苗 +1 位作者 郭燕风 王宜磊 《食品工业》 CAS 北大核心 2020年第11期319-323,共5页
快速估测出透明质酸发酵过程中还原糖含量对生产实践有重要指导意义。使用软件对透明质酸发酵液中还原糖含量与其他主要参数进行相关性分析,结果发现浊度、电导率与还原糖含量不存在相关性;继续偏相关分析,菌体量与还原糖含量存在虚假... 快速估测出透明质酸发酵过程中还原糖含量对生产实践有重要指导意义。使用软件对透明质酸发酵液中还原糖含量与其他主要参数进行相关性分析,结果发现浊度、电导率与还原糖含量不存在相关性;继续偏相关分析,菌体量与还原糖含量存在虚假性相关,黏度及透明质酸含量与还原糖含量相关性显著。考虑到检测方法的简便性,选择发酵液黏度作为估测透明质酸发酵液中还原糖含量的唯一参数。利用所获得一元线性回归、二次项曲线回归及BP神经网络3种数学模型对透明质酸发酵液中还原糖含量进行估测验证,结果表明,BP神经网络模型的估测效果最好,方差仅0.1694。 展开更多
关键词 透明质酸 还原糖 快速估测 相关性分析 BP神经网络
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New Approach for Rapid Assessment of Trophic Status of Yellow Sea and East China Sea Using Easy-to-Measure Parameters 被引量:3
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作者 KONG Xianyu LIU Yanfang +3 位作者 JIAN Huimin SU Rongguo YAO Qingzhen SHI Xiaoyong 《Journal of Ocean University of China》 SCIE CAS CSCD 2017年第5期781-792,共12页
To realize potential cost savings in coastal monitoring programs and provide timely advice for marine management, there is an urgent need for efficient evaluation tools based on easily measured variables for the rapid... To realize potential cost savings in coastal monitoring programs and provide timely advice for marine management, there is an urgent need for efficient evaluation tools based on easily measured variables for the rapid and timely assessment of estuarine and offshore eutrophication. In this study, using parallel factor analysis(PARAFAC), principal component analysis(PCA), and discriminant function analysis(DFA) with the trophic index(TRIX) for reference, we developed an approach for rapidly assessing the eutrophication status of coastal waters using easy-to-measure parameters, including chromophoric dissolved organic matter(CDOM), fluorescence excitation–emission matrices, CDOM UV-Vis absorbance, and other water-quality parameters(turbidity, chlorophyll a, and dissolved oxygen). First, we decomposed CDOM excitation-emission matrices(EEMs) by PARAFAC to identify three components. Then, we applied PCA to simplify the complexity of the relationships between the water-quality parameters. Finally, we used the PCA score values as independent variables in DFA to develop a eutrophication assessment model. The developed model yielded classification accuracy rates of 97.1%, 80.5%, 90.3%, and 89.1% for good, moderate, and poor water qualities, and for the overall data sets, respectively. Our results suggest that these easy-to-measure parameters could be used to develop a simple approach for rapid in-situ assessment and monitoring of the eutrophication of estuarine and offshore areas. 展开更多
关键词 eutrophication offshore moderate dissolved discriminant decomposed advice urgent timely matrices
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Assessment of HRP2-Based RDT in Diagnosing Malaria Cases
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作者 Yemou Dieng Doudou Sow +9 位作者 Therese Dieng Abdourahmane Sow Babacar Faye Jean Louis Ndiaye Daouda Ndiaye Roger Cl6ment Tine Khadime Sylla Oumar Faye Oumar Ndir Oumar Gaye 《Journal of Life Sciences》 2012年第6期602-607,共6页
Background: HRP2-based Rapid Diagnostic Tests (RDTs) for malaria ensure a rational use of artemisinin-based combination therapy (ACT). The HRP2 antigen can go through the cerebrospinal fluid (CSF). Purpose: To... Background: HRP2-based Rapid Diagnostic Tests (RDTs) for malaria ensure a rational use of artemisinin-based combination therapy (ACT). The HRP2 antigen can go through the cerebrospinal fluid (CSF). Purpose: To assess the HRP2-based RDT in malaria and detect the HRP2 in CSF. Methods: From November 2006 to May 2007, all patients under 15 years showing clinical symptoms of malaria were included. RDT was performed on the CSF and peripheral blood. Results: Out of the 951 patients included, 131 (13.7%) were confirmed through RDT and 130 (13.6%) through thick blood smear. Sensitivity and specificity stood at 96.96% and 99.71% respectively, for uncomplicated cases and at 100% and 99.13% for severe cases. Tests to detect HRP2 in the CSF of 52 cases were negative. Conclusion: Tests to detect HRP2 in the CSF could make it possible to diagnose severe malaria cases when peripheral parasitemia would be below the detection threshold. 展开更多
关键词 MALARIA rapid diagnostic test PAEDIATRICS HRP2 antigen cerebrospinal fluid
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Evaluating the Validity of a Nitrate Quick Test in Different Chinese Soils
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作者 YUE Xian-Lu LI Fei +4 位作者 HU Yun-Cai ZHANG Huai-Zhi JI Hong-Jie ZHANG Wei-Li U. SCHMIDHALTER 《Pedosphere》 SCIE CAS CSCD 2012年第5期623-630,共8页
Because laboratory tests are expensive and time-consuming and may not be available to farmers, soil nitrate quick tests are required for optimal nitrogen management strategies in China to increase nitrogen use efficie... Because laboratory tests are expensive and time-consuming and may not be available to farmers, soil nitrate quick tests are required for optimal nitrogen management strategies in China to increase nitrogen use efficiency and to reduce nitrogen losses. A total of 328 soil samples were collected at different soil depths from 225 sites in China, which covered a wide range of climatic and geographic regions, soil types, croplands and soil textures, to evaluate the suitability of a quick reflectometer test method for analysing soil NO3-N in a wide range of soil NO3 concentrations, soil types and cropping systems in China, mainly by comparison of soil NO3-N assessed by a quick-test method (a reflectometer) and a standard laboratory method, i.e., high-performance liquid chromatography (HPLC). The reflectometer showed excellent agreement with the laboratory HPLC method with regard to soil nitrate contents for all analysed soil samples. The linear regression had slopes of 1 ± 0.08 and intercepts of ± 1.38 mg NO(-,3)-N L^(-1) among different soil types and croplands. Compared with the 1:1 lines, the regression analysis for each soil type showed statistically significant but small differences in slope; the relative difference between the values measured using the two analytical systems varied from -8% to 6%, and there were no differences in intercept except for paddy soil. The reflectometer showed adequate, statistically significant precision in determining soil nitrate contents, and it could therefore be directly used instead of the laboratory methods for soil NO(-,3)-N measurement in China. 展开更多
关键词 DILUTION N recommendation nitrate test strip REFLECTOMETER soil NO(3 -)-N
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