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本文参考GB/T 23993-2009《水性涂料中甲醛含量的测定》,采用乙酰丙酮分光光度法,测定了水性涂料中的甲醛含量,结果显示,该方法操作方便,简单易行。 相似文献
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分光光度法是生物、化学研究中广泛应用的方法之一,它广泛应用于糖、蛋白质、核酸、酶等的快速定量检测和对化学研究中微量金属元素的测定。笔者结合自己工作的环境和经验,简要讲解分光光度法和分光光度法对微量金属元素测定的应用以及它的发展前景。 相似文献
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目的:建立人参饮品中人参皂甙含量的测定方法。方法:采用分光光度法对人参总皂甙含量进行测定,高效液相法对人参皂甙单体Re、Rg_1、Rb_1含量进行测定。结果:采用分光光度法测定人参总皂甙,标准曲线Y=0.005 0X+0.004 0,相关系数R2=0.998 2,表明人参皂甙Re含量在20~100μg有良好的线性关系。回收率可达到92.5%~101.7%,表明采用本方法测定饮品中人参总皂甙含量的准确性较高。液相色谱法对皂甙单体的测定,是对药典方法的改进,能有效提高工作效率,得到准确数据,通过对方法学考察,其精密度、稳定性、重现性、回收率均表现良好。结论:该方法操作性强,准确高效,可满足检验检测需求。 相似文献
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碱性过硫酸钾——紫外分光光度法测定废水中总氮,测定过程空白吸光度值容易太高,标准曲线无法满足要求,直接影响测定结果的准确度。检测样品中含较多悬浮物时,检测结果严重偏低。通过多种因素分析和实验对比,提出了改进措施,使检测结果更准确。 相似文献
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DOMINICK SAMPERI 《Mathematical Finance》2002,12(1):71-87
A regularized (smoothed) version of the model calibration method of 1 ) is studied. We prove that the regularized formulation is solvable and that the solution depends continuously on the input data (observed derivative security prices). Associated issues of model credibility, stability, and robustness (insensitivity to model assumptions) are discussed. The Implicit Function Theorem for Banach spaces is used for the stability proof, and some numerical illustrations are included. 相似文献
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[目的]建立高效液相色谱法(HPLC)同时测定猪肉样品中克伦特罗、沙丁胺醇、土霉素、四环素残留量的检测方法.[方法]样品用0.01 mol/L EDTA-2Na、0.3%磷酸溶液、高氯酸(1:1)混合溶液提取,上清液过C18固相萃取柱净化,采用高效液相色谱分离,二极管阵列检测器(DAD)检测,外标法定量.[结果]克伦特罗、沙丁胺醇在0.04~10μg/mL范围内线性关系良好.相关系数为0.99992~0.99993.在0.001~0.05mg/kg添加浓度范围内,平均回收率在70.3%~94.3%之间,相对标准偏差为1.52%~5.85%,土零素、四环素在0.5~10μg/mL范围内线性关系良好,相关系数为0.99993~0.99997.在0.02~0.5mg/kg添加浓度范围内,平均回收率在64.1%~94.2%之间,相对标准偏差为1.23%~4.53%.[结论]本法简便、快速、定量准确、精密度商.适用于猪肉样品中克伦特罗,沙丁胺醇、土霉素、四环素残留量的同时检测. 相似文献
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This article proposes a calibration algorithm that fits multifactor Gaussian models to the implied volatilities of caps with the use of the respective minimal consistent family to infer the forward‐rate curve. The algorithm is applied to three forward‐rate volatility structures and their combination to form two‐factor models. The efficiency of the consistent calibration is evaluated through comparisons with nonconsistent methods. The selection of the number of factors and of the volatility functions is supported by a principal‐component analysis. Models are evaluated in terms of in‐sample and out‐of‐sample data fitting as well as stability of parameter estimates. The results are analyzed mainly by focusing on the capability of fitting the market‐implied volatility curve and, in particular, reproducing its characteristic humped shape. © 2005 Wiley Periodicals, Inc. Jrl Fut Mark 25:1093–1120, 2005 相似文献
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Sergio Parrinello 《Metroeconomica》2011,62(2):328-355
This paper addresses the stability of a multimarket competitive equilibrium. The dependence of stability on the choice of the numeraire is clarified. The traditional tâtonnement pricing is revised in order to satisfy some basic features of economic behaviour. Well‐known conditions for local stability are proved to be insufficient if a market for credit is introduced alongside the markets of dated commodities. Stability depends not only on the slopes of the demand and supply curves, but also on equilibrium prices. This result emerges without the occurrence of capital perversities, such as reswitching and reverse capital deepening. 相似文献
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菜克多巴胺单克隆抗体的制备及竞争性ELISA检测方法的建立 总被引:1,自引:0,他引:1
本研究利用偶联的莱克多巴胺(Rac)作为免疫原,筛选出能稳定分泌针对莱克多巴胺的单克隆抗体的细胞株D1289,其分泌的单克隆抗体免疫球蛋白亚类为IgCl,单抗腹水的效价不低于1:1×10^7,与Rac的类似物克伦特罗不发生交叉反应。在此基础上,利用获得的单抗研究建立Rac的竞争性酶联免疫吸附检测法(cELISA),结果表明:所建立的间接竞争ELISA方法检测校准曲线的线性范围在0.01ng/mL-10ng/mL(RE=-0.9353)。 相似文献
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建立了牛奶中20种有机氯农药残留的气相色谱-串联质谱检测方法。样品采用正己烷-丙酮混合溶剂提取,凝胶渗透色谱和弗罗里硅土固相萃取联合净化,气相色谱-串联质谱测定。标准溶液在4μg/L-400μg/L范围内线性关系良好;方法的定量限为0.8μg/kg。20种有机氯农药在3个水平(0.8、2.0、10.0μg/kg)的加标回收率为62.2%-103.8%,相对标准偏差(RSDs)为3.4%-13.1%。该分析方法稳定可靠,灵敏度高,适合牛奶中多种有机氯农药残留量的检测。 相似文献
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This paper presents a model-based methodology called DESIGNOR to support design decisions for new industrial products. Models and measurements are developed to assess the relationship between product features and market potential. The methodology incorporates a measurement survey for model calibration and leads to empirical tradeoff curves between design dimensions. The approach handles discrete as well as continuous features and can be incorporated into a procedure aimed at finding a profit maximizing design. It can be used to support decisions concerning product design as well as for product line expansion. The approach provides a consistent way of evaluating market potential for new industrial products and presents important advantages over other product design methodologies. 相似文献
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针对偏馈法距离校零产生的误差,提出一种几何校正方法。与传统的零值分离方法不同,该方法基于距离测量原理,用几何法分解对塔校零和偏馈校零的信号路径,并计算对塔校零的距离零值,然后采用参数传递的方式代入到偏馈校零的表达式中导出数学模型,使两种校零方法的距离零值完全等效,从机理上消除了偏馈法的零值误差。同时,考虑近场时延误差和漏射误差,可确定校零天线的最佳安装位置。试验结果表明,校正后的偏馈校零与对塔校零相比,距离零值的误差小于1 m。由于计算模型简单易用,该几何校正方法对当前无塔标校的应用具有一定参考价值。 相似文献