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1.
叙述了“比值”和“根值”判敛法的相似和不同之处,通过命题和例子说明后比前适用的范围更加广泛,并将两种判敛法结合,给出了一个更一般的正项级数判敛法。  相似文献   

2.
1987年第6期《教材通讯》刊载了无穷限广义积分的“导数判敛法”,从一个侧面弥补了比较判敛法的不足.现在我们再给出另一个判敛法,它将给一类无穷限广义积分敛散性判别带来方便.  相似文献   

3.
本文首先指出,和无穷限广义积分的Cauchy判敛法相比,根值判敛法和对数判敛法并没有提高判敛的精度;接着论证它们也没有拓宽判敛的范围;末了,从提高无穷限广义积分的判敛精度着眼给出另一个对数判敛法。  相似文献   

4.
众所周知,正项级数sum from n=1 to ∞(1/n)1/n~p(P级数)和sum from n=2 to ∞(2/n)(1/nln~pn)都是当p>1收敛,当p≤1发散。本文根据这一事实推导出一组定理,为寻求正项级数的判敛法则提供了一般途径,由这些定理建立的判敛法则的“灵敏度”分别与上述两个级数的敛散速度相当,文中列举了四个实例,其中包括拉贝判敛法与伯尔特昂判敛法。  相似文献   

5.
本文给出了广义积分的一种判敛法——对数判敛法,并举例说明了仑比柯西判别法的优越之处。  相似文献   

6.
本文给出了一个关于正项级数判敛的新定理,其推论包括文[1]的结果<推论2>,且判敛性能强于高斯定理(推论3)。  相似文献   

7.
关于正项级数的判敛法   总被引:1,自引:0,他引:1  
讨论了正项级数的判敛法,纠正了某数学分析教材用拉贝判别法解题的一处错误,并给出了一个不存在收敛最慢的正项级数的命题.  相似文献   

8.
古代中国曾存在过一种以法及其善,Yi,美(三字均以“羊”为内核)为特质的“羊化”。古人将“羊”视作“神判”和“吉祥”物。法的古写作“法”,其中的“廉”就是神判“解廉”(Xie豸)。Xie豸也也就是古代中国原始法道德历史化中的“神羊”,善,Yi,美中的“羊”就是神判羊“廉”及其原始法的历史隐喻符号,善是古代对法的秉公和道德的公正体现:Yi是古人对法的践履和道德的力行体验,美是古人对法的敬仰和道德的价值取向。有别于蛙,虎,龙(图腾)的“羊”不是一个附加在灵物之上的吉祥物,其本身就是一个吉祥物(古“羊”即“祥”),因而羊是中华民族最具代表性的吉祥物,真正能够代表“黄河明”及其祥和循法与礼仪之邦的吉祥物不是表征帝王和皇权的“龙”,而是作为法道象征的“羊”。中华民族祥和循法,道德践履的优良传统与审美崇尚的诗性精神根植于古老的“羊化”。  相似文献   

9.
对于正项级数∑^∞n=1 an=∑^∞n=1f(n)(an=f(n)〉0),借助于比值f(n)/f(n+1)(或其极限),可以判其敛散性(收敛或发散),但有失效的情况。对此,已有一些改进的方法。在此基础上.文章提出了无限改进的一种方法,并从哲学角度进行了分析,进而提出了正项级数“敛散级”的概念。  相似文献   

10.
敛和敛,字形相近,古书中往往混用。如《春秋左传》的“敛盂”,有作“(佥欠)盂”的;《荀子·富国》“厚刀布之敛”、《诗·大雅荡》“敛怨以为德”之“敛”,亦作“(佥欠)”的;有的词书径释“(佥欠)”为“敛”的异体字。其实,敛、(佥欠)二字的音、形、义都有差  相似文献   

11.
测边交会法可用于建筑施工变形监测中,传统的方法是钢尺丈量边长交会法,随着电子技术的发展,电子测距仪的应用,特别是全站仪的逐步推广与应用,测边交会法用于建筑施工变形监测又有广泛应用的趋势。但交会点的坐标及误差计算比较复杂,经作者进行测边交会的误差分析的计算结果公式,应用可编程序型计算器fx-4500P及开发的程序,可快速、准确计算测边交会点的坐标和点位精度。  相似文献   

12.
This paper investigates children's use of converging obliques in their drawings of objects. Adults and adolescents, as well as 7‐year‐old children, were not very successful in using converging obliques in their drawings of small‐scale objects; they tended to use parallel edges. When confronted with the apparent convergence of a real road receding into the distance adults and adolescents switched to using converging obliques; 7‐year‐olds still drew parallel roadsides. Children were induced to use converging obliques, however, when asked to copy from a line drawing of a road or from a photograph, particularly when the convergence of the road in the photograph was more dramatic.  相似文献   

13.
对概率型Sz偄sz算子Sn(f,x)在 ( 0 ,+∞ )上收敛于 [f(x+ ) +f(x-) ]/2的收敛速度进行了研究 ,并利用概率论的方法 ,对Guo和Khan关于Sn(f,x)的收敛速度的估计作进一步的改进 ,得到更精确的系数估计  相似文献   

14.
对Guo和Kha等学者关于Baskakov算子收敛速度的估计问题,作进一步的探究,利用概率论等方法,对k阶矩重新计算和估计,得到Baskakov算子(0,+∞)在上收敛于[f(x+)+(x-)]/2的收敛速度更精确的系数估计。  相似文献   

15.
作为关联理论的一个重要概念,认知语境强调了听话者在交际中发挥的认知主体作用。在话语理解过程中,交际双方在认知语境上越趋同,交际就越成功。以该理论为基础所引入的趋同性认知语境概念,突显了"最大化互动-渐进性趋同-最大化相似"理念,呈现了如何定位英语阅读理解中的词汇、短语、句子及篇章意义及如何在阅读教学中帮助学习者建构趋同性认知语境。  相似文献   

16.
从20世纪90年代中后期开始,文学批评形态的价值取向受社会经济转型和大众传媒的渗透逐渐走向多元化,并最终形成了当前主流、精英、大众批评三足鼎立的局面。这三种文学批评既各自独立、独具特色,又相互融合,共同构成了多元价值取向和谐发展的文学批评体系。  相似文献   

17.
给出了几个上三角迭代公式,讨论了它们的收敛性,给出了选代法的一个新的一般形式和一个矩阵迭代公式,一般形式为构造快速收敛的迭代提供了方便,矩阵迭代则是一种具有较快敛速的算法.讨论了迭代法进行消元的问题,误差估计的结果表明用迭代法进行消元是稳定的、可行的.  相似文献   

18.
A speed-sensorless vector control system for induction machines (IMs)is presented, According to the vector control theory of IMs, the rotor flux is estimated based on a flux observer,and the speed is estimated through the method of q-axis rotor flux converging on zero with proportional integral regulator, A 0.75 kW,50 Hz,two-pole induction machine was used in the simulation and experimental verification, The simulation model was constructed in Matlab. A series of tests were performed in the field weakening region, for both no-load and loaded operation. The estimated speed tracks the actual speed well in the based speed region and field weakening region ( 1 per unit value to 4 per unit value). The small estimation error of residual speed is due to the existence of slip.  相似文献   

19.
《Learning and Instruction》2007,17(3):345-359
The study focuses on design education using Experiential Learning Theory (ELT) and explores the effects of learning styles and gender on the performance scores of freshman design students in three successive academic years. Findings indicate that the distribution of design students through learning style type preference was more concentrated in assimilating and converging groups. Further study indicates that the first and third groups were found to be more balancing while the second group being mostly a southerner. The learning style preferences did not significantly differ by gender in all three groups. Although there is no consistency in all three groups, results indicate that the performance scores of males were higher in technology-based courses, whereas scores of females were higher in artistic and fundamental courses and in the semester academic performance scores (GPA). Also, it was found that the performance scores of converging and diverging students differed significantly in favor of converging students only in design courses. In design education, instructors should provide a strategy that is relevant to the style of each learner in design studio process.  相似文献   

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