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物理勘探中,需要计算含一阶贝塞尔函数的广义积分.一种传统的方法是在贝塞尔函数零点之间一次应用一般积分法则积分,最后求和,这种方法收敛比较慢,特别在贝塞尔函数中r值很大的时候.另一种应用广泛的方法是数字滤波技术,该法比第一种方法快,但要求核函数迅速衰减.本文给出了一种新的计算方法,能处理核函数衰减很慢且r很大的问题,方法简单,高效率,精度高. 相似文献
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非线性抛物型初边值问题的差分-边界有限元耦合方法及其误差估计 总被引:1,自引:0,他引:1
一、引言边界元方法以其对于无界区域问题的独特有效性及其它一些性质,在工程技术和计算数学领域得到越来越广泛的重视、应用和研究.对于椭圆型边值问题,边界元方法的应用和理论研究已是硕果累累,对于发展型的初边值问题,近十年来,其理论研究在某些方面已取得了突破性进展,但仍有许多方面处于空白.发展型方程的边界元方法基本上分为三种类型:第一种类型是利用发展型方程的基本解导出发展型的边界积分方程;第二种类型是通过可逆积分变换将发展方程转化为椭圆型方程;第三种类型是对于时间变量采用差分离散化,将发展型方程转化成一组椭圆型方程.对于第一种类型方法的应用和理论研究已日臻完善.但对于第三种类型方法的理论分析尚属空白.本文研究第三种类型方法的应用及其误差分析,给出了数值计算格式和近似解的先验误差估计. 相似文献
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基于可拓分析的信息模式识别方法 总被引:4,自引:0,他引:4
采用可拓评判方法,应用物元概念和关联函数,确定了玉米螟种群动态分级识别的的经典域物元和节域物元,提出了一种新的基于可拓分析的信息模式识别方法,并探讨了其应用.应用结果表明,历史拟合率达100%,1995、1996两年预报,其结果与实际一致.说明该识别方法具有良好的应用前景,一种全新的模式识别分类器. 相似文献
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应用属性层次模型 AHM进行选股决策 .属性层次模型 AHM方法简便易行 .实证表明 ,属性层次模型 AHM方法是一种有效的股票选择方法 . 相似文献
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强混合序列的联结构造与完全收敛性 总被引:1,自引:0,他引:1
对强混合随机变量序列,提出一种"联结构造”方法.作为它的应用,给出强混合序列的完全收敛性.这里的方法,也为处理其它相依随机变量序列,提供一种新的途径. 相似文献
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在初中几何中,三角形的面积有很多种计算方法,如S=1/2ah,S=1/2absinC,海伦公式.但是这些方法在直角坐标系中往往很难应用,本文介绍一种简单的方法并举例说明它的应用. 相似文献
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肝药酶诱导剂苯巴比妥能诱导细胞色素P-450的合成,而肝药酶抑制剂放线菌素D能抑制细胞色素P-450的合成,本实验应用示差光谱法对P-450含量加以测定.本文改进了传统的计算药后诱导组和抑制组P-450含量增加或减少的百分比来评价药物的方法,在M athem atica数学软件环境下,对数据进行方差分析和t检验,提高了数据处理精度和可信度.并对原方法表示怀疑. 相似文献
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James Singletary 《Mechanics of Composite Materials》2000,36(4):319-326
Results of single transverse compression testing of PPTA and PIPD fibers, using a novel test device, are presented and discussed. In the tests, short lengths of single fibers are compressed between two parallel, stiff platens. The fiber elastic deformation is analyzed as a Hertzian contact problem. The inelastic deformation is analyzed by elastic-plastic FE simulation and by laser-scanning confocal microscopy of the compressed fibers ex post facto. The results obtained are compared to those in the literature and to the theoretical predictions of PPTA fiber transverse elasticity based on PPTA crystal elasticity.Presented at the 11th International Conference on Mechanics of Composite Materials (Riga, June 11–15, 2000).3TEX, Inc. 109, MacKenan Drive, Cary, North Carolina 27511, USA. Published in Mekhanika Kompozitnykh Materialov, Vol. 36, No. 4, pp. 533–544, March–April, 2000. 相似文献
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文[4]提出了网络优化中若干有待解决的组合问题,本文围绕其中之一“减小直径问题”进行了探讨.设P(n,t)表示长为n的路径增加t条边后所得图直径的最小值,C(n,t)表示长为n的圈增加t条边后所得回直径的最小值.本文取得如下进展:1)给出P(n,2),P(n,3)及C(n,2)的精确值,并得出P(n,4)的一更精细的上界及一种更好的加边方式.上述结果均满足小极大度原则.2)在有极大度限制的条件下,分别对t为偶数和奇数给出了P(n,t)的上界. 相似文献
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通过Hadarnard卷积定义算子I<,n+p-1>,并利用其引进了新的解析函数类H(p,n,δ,A,B),研究了函数f(z)(f(z)∈A<,p>)属于函数类H(p,n,δ,A,B)的充分条件和部分和性质,同时还考虑了类H(p,n,δ,A,B)的卷积性质. 相似文献
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N. Hussain 《分析论及其应用》2006,22(1)
We extend the concept of R-subcommuting maps due to Shahzad[17,18] to the case of non-starshaped domain and obtain a common fixed point result for this class of maps on non-starshaped domain in the setup of p-normed spaces. As applications, we establish noncommutative versions of various best approximation results for generalized I-nonexpansive maps on non-starshaped domain. Our results unify and extend that of Al-Thagafi, Dotson, Habiniak, Jungck and Sessa, Latif, Sahab, Khan and Sessa and Shahzad. 相似文献
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D. D. Zakharov 《Mechanics of Composite Materials》1999,35(5):403-408
An asymptotic analysis of the dynamic stress-strain state of a thin laminar packet of anisotropic layers is presented. The
statement is nonclassical, since in layer materials the ratio of elastic moduli in the longitudinal and transverse directions
can generate small parameters comparable to the relative half-thickness of the packet, as, for example, in high-strength unidirectional
composites. Alternation of strong load-carrying layers and a relatively soft filler with a similar difference in the elastic
moduli between the layers is also allowed. The averaged two-dimensional equations and the total stress tensor in the layers
are determined. The results are classified with respect to the types of anisotropy and the indices of differences in the elastic
moduli. It is shown that first-approximation models lead to kinematic relations similar to those of the theories of high-order
shear strains.
Institute of Problems of Mechanics, Russian Academy of Sciences, Moscow, Russia. Translated from Mekhanika Kompozitnykh Materialov,
Vol. 35, No. 5, pp. 605–614, September–October, 1999. 相似文献
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Using the predicate language for ordered fields a class of problems referred to aslinear problems is defined. This class contains, for example, all systems of linear equations and inequalities, all linear programming problems, all integer programming problems with bounded variables, all linear complementarity problems, the testing of whether sets that are defined by linear inequalities are semilattices, all satisfiability problems in sentenial logic, the rank-computation of matrices, the computation of row-reduced echelon forms of matrices, and all quadratic programming problems with bounded variables. A single, one, algorithm, to which we refer as theUniversal Linear Machine, is described. It solves any instance of any linear problem. The Universal Linear Machine runs in two phases. Given a linear problem, in the first phase a Compiler running on a Turing Machine generates alinear algorithm for the problem. Then, given an instance of the linear problem, in the second phase the linear algorithm solves the particular instance of the linear problem. The linear algorithm is finite, deterministic, loopless and executes only the five ordered field operations — additions, multiplications, subtractions, divisions and comparisons. Conversely, we show that for each linear algorithm there is a linear problem which the linear algorithm solves uniquely. Finally, it is shown that with a linear algorithm for a linear problem, one can solve certain parametric instances of the linear problem.Research was supported in part by the National Science Foundation Grant DMS 92-07409, by the Department of Energy Grant DE-FG03-87-ER-25028, by the United States—Israel Binational Science Foundation Grant 90-00434 and by ONR Grant N00014-92-J1142.Corresponding author. 相似文献
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《Journal of computational and graphical statistics》2013,22(1):163-188
The PlatoCAVE, the MiniCAVE, and the C2 are immersive stereoscopic projectionbased virtual reality environments oriented toward group interactions. As such they are particularly suited to collaborative efforts in data analysis and visual data mining. In this article, we provide an overview of virtual reality in general, including immersive projection technology, and the use of stereoscopic displays for data visualization. We discuss design considerations for the construction of these immersive environments including one-wall versus four-wall implementations, augmented reality, stereoscopic placement, head tracking, the use of LCD devices, polarized light stereo, voice control, and image synchronization. 相似文献