共查询到20条相似文献，搜索用时 44 毫秒
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采用的非线性方法是基于24 h的平均温度,通过下列4种方法计算得到的逐时平均、四次平均、三次观测数据加上加权订正所得数据的平均、最高最低平均法得到的日平均温度与逐时平均比较,同时求出各种结果和24 h计算所得平均温度之间的离散度,发现在日平均温度的计算上,除了所述的24 h平均温度计算方法外,4次平均方法求出的日平均温度具有较好代表性,其他两种方法计算偏差相对较大。 相似文献
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杨玉敏 《鞍山师范学院学报》2010,12(6):5-9
微分中值定理是微积分学基本定理之一,是研究函数性态的有利工具.本文首先给出了微分中值定理及其推广形式,并对中值定理中点的位置、拉格朗日中值定理、柯西中值定理和积分中值定理的关系进行了探讨. 相似文献
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王凡彬 《内江师范学院学报》2010,25(12):11-13,16
为了建立柯西中值定理与积分中值定理两类不同性质的中值定理的关系,利用柯西中值定理证明了积分中值定理.在定积分情形下,利用积分上限函数和柯西中值定理证明了积分中值定理;在重积分情形下,利用积分上限函数、柯西中值定理和区域函数的概念证明了积分中值定理.初步建立了两类不同性质的中值定理的关系. 相似文献
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王霞 《南阳师范学院学报》2011,10(9):14-17
文献[1]中例3讨论了样本均值偏离总体均值的概率的精确估计.利用极限的性质将样本均值X（1n）偏离总体均值μ的概率的精确估计推广至样本均值X（δ）δ,∈（0,∞）偏离总体均值μ的情况. 相似文献
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改变了教材上微分中值定理的呈现顺序,引导学生通过猜想得到柯西中值定理,再推导出拉格朗El中值定理和罗尔中值定理,启发学生构造合适的辅助函数证明微分中值定理。此外,还探讨了微分中值定理的多元化教学。 相似文献
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An Extension of Four IRT Linking Methods for Mixed-Format Tests 总被引：1，自引：0，他引：1
Under item response theory (IRT), linking proficiency scales from separate calibrations of multiple forms of a test to achieve a common scale is required in many applications. Four IRT linking methods including the mean/mean, mean/sigma, Haebara, and Stocking-Lord methods have been presented for use with single-format tests. This study extends the four linking methods to a mixture of unidimensional IRT models for mixed-format tests. Each linking method extended is intended to handle mixed-format tests using any mixture of the following five IRT models: the three-parameter logistic, graded response, generalized partial credit, nominal response (NR), and multiple-choice (MC) models. A simulation study is conducted to investigate the performance of the four linking methods extended to mixed-format tests. Overall, the Haebara and Stocking-Lord methods yield more accurate linking results than the mean/mean and mean/sigma methods. When the NR model or the MC model is used to analyze data from mixed-format tests, limitations of the mean/mean, mean/sigma, and Stocking-Lord methods are described. 相似文献
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应用介值定理、微分中值定理和积分中值定理讨论了中值的存在性,并利用单调性或反证法讨论了中值的唯一性。 相似文献
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在数学分析中积分中值定理与微分中值定理同样重要,而且应用积分中值定理求解题目的方法和技巧多种多样。文章主要对积分第二中值定理的三种形式加以探究,并通过典型例题指出,适当地作变量替换可将所求解的问题转化为适宜利用积分第二中值定理的情形,从而使问题得以简化求解。 相似文献
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陈世哲 《南阳师范学院学报》2012,11(6):18-20
利用Rolle微分中值定理和推广的Grace定理,获得了一些新的二重积分中值定理和复函数积分中值定理,推广和改进了积分型Cauchy中值定理和二重积分中值定理. 相似文献
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通过研究第一型曲线积分第二中值定理"中间点"的渐近性,将结论推广到积分第二中值定理"中间点"的渐近性。首先给出第一型曲线积分第二中值定理及其证明,得出一个结论,由这个结论推导出定积分第二中值定理相应的结果。所得结论推广了文献[1-3]中关于积分第二中值定理的结论。 相似文献
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本文论证了平均值原理成比例性的充分必要条件,从而揭示了平均值原理和K—阶均值原理之间的联系. 相似文献
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Rajendra Bhatia 《Resonance》2008,13(6):583-594
The inequality between the arithmetic mean (AM) and geometric mean (GM) of two positive numbers is well known. This article
introduces the logarithmic mean, shows how it leads to refinements of the AM-GM inequality. Some applications and properties
of this mean are shown. Some other means and related inequalities are discussed.
Rajendra Bhatia is a Professor at the Indian Statistical Institute, New Delhi. Some of his recent work is on means of matrices.
But he is not a mean theorist. 相似文献
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王锐利 《漯河职业技术学院学报》2012,11(2):97-99
针对微分中值定理进行了更深入的探讨。用两种方法分别证明了拉格朗日中值定理和柯西中值定理,并给出了它们之间的相互关系以及几何意义。最后通过具有代表性的典型例题说明微分中值定理的应用。 相似文献
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In statistics, and in everyday life as well, the arithmetic mean is a frequently used average. The present study reports data from interviews in which students attempted to solve problems involving the appropriate weighting and combining of means into an overall mean. While mathematically unsophisticated college students can easily compute the mean of a group of numbers, our results indicate that a surprisingly large proportion of them do not understand the concept of the weighted mean. When asked to calculate the overall mean, most subjects answered with the simple, or unweighted, mean of the two means given in the problem, even though these two means were from different-sized groups of scores. For many subjects, computing the simple mean was not merely the easiest or most obvious way to initially attack the problem; it was the only method they had available. Most did not seem to consider why the simple mean might or might not be the correct response, nor did they have any feeling for what their results represented. For many students, dealing with the mean is a computational rather than a conceptual act. Knowledge of the mean seems to begin and end with an impoverished computational formula. The pedagogical message is clear: Learning a computational formula is a poor substitute for gaining an understanding of the basic underlying concept.Research support: Research reported in this paper was supported by NSF research award No. SED78-22043 in the Joint National Institute of Education-National Science Foundation Program of Research on Cognitive Processes and the Structure of Knowledge in Science and Mathematics. 相似文献
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不等式涉及数量之间大小的比较,而通过比较常能显示出变量之间变化时相互制约的关系·因此,从某种意义上来说,不等式的探讨在数学分析中甚至比等式的研究更为重要·用一个较简便的方法证明了一个重要的不等式· 相似文献
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赵教练 《渭南师范学院学报》2007,22(5):28-29,59
拓广平均由K.B.Stolarsky给出定义并列出其各种形式,而大部分含有两个变量的平均值都是拓广平均值的某种特殊情形.文章给出拓广平均值的一类情形,并利用有关中值定理和导数工具着重讨论了此类平均值函数的单调性、凹凸性. 相似文献
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黄鳝体内新棘衣棘头虫的感染研究 总被引：9，自引：0，他引：9
本文以黄鳝为材料．研究了黄鳝体内新棘衣棘头虫的感染情况，发现：黄鳝的感染率为３８．３％，感染强度为４．６５，平均密度为１．７８；黄鳝体长为２０１—３５０ｍｍ范围时．其感染率、感染强度随着体长的增大而增大，感染率范围为２３．５％－６６．７％，感染强度范围为２．７５—７．２５。 相似文献