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乘积之和
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  product sum
     In the paper,the author uses the theory of elementary transformation of the matrix,unchanging the matrix rank,putting the invertible matrix into two vector product sum. The author reuses the formula(G+uv~T)~(-1) to give the iteration formula of inverse matrix.
     应用矩阵的初等变换不改变矩阵的秩的理论,将一个可逆矩阵分解为两个向量乘积之和,再运用求(G+uvT)-1的公式,建立并给出了求逆矩阵的迭代公式。
短句来源
     The theory of the imaginary part matrix of the complex matrix is put into two vector product sum by using the elementary transformation of the matrix of unchanging the matrix rank.
     将复数矩阵的虚部矩阵应用矩阵的初等变换不改变其秩的理论,分解成两个向量乘积之和分解式。
短句来源
  “乘积之和”译为未确定词的双语例句
     Hsu-Robbins Type Theorems for Pairwise Products Sums of I.I.D. Random Variables (Ⅰ)
     I.I.D.随机变量两两乘积之和的Hsu-Robbins型定理(Ⅰ)
短句来源
     Hsu-Robbins Type Theorems for Pairwise Products Sums of I.I.D. Random Variables (Ⅱ)
     I.I.D.随机变量两两乘积之和的Hsu-Robbins型定理(Ⅱ)
短句来源
     A efficient method for generating topological formulas of network functions and their sensitivity is presented. Tree and K-tree of a graph is applied in this method.
     给出了确定无源网络函数及其灵敏度全符号表达式的拓扑方法 ,该方法是以图论为基础 ,利用连通图中树与K -树树支导纳乘积之和 ,方法简捷有效 ,工作量减缩。
短句来源
     Furthermore, it was proved that there was no difference between the content determined in 11 soils and the data calculated, that is, the sum of multiplying content of particles by the contents of fixed ammonium.
     无论是北方土壤还是南方土壤,各个颗粒的固定态钱含量均以粘粒最高,粉粒次之,砂粒甚少; 根据各个土壤颗粒的固定态按含量及粒级的百分数,分别计算了11种土壤的固定态钱含量,证明各个粒级与固定态钱乘积之和与测定的土壤固定态钱之间有着良好的一致性。
短句来源
     Also, the inversion of a Hankel(Vandermonde)matrix can be denoted as a sum of products of particular matrices. Especially, a fast algorithm for the inversion of a Hankel matrix with O( n~2) operations (rather than O(n~3), as required by standard matrix inversion methods) is derived.
     表明Hankel矩阵、Vandermonde矩阵的逆矩阵可以表示为一些特殊矩阵的乘积之和,并以Hankel矩阵为例,得到了求逆的快速算法,所需计算量为O(n2),一般n阶矩阵求逆的计算量为O(n3).
短句来源
更多       
  相似匹配句对
     On the Inequalities for Trace of Product of Skew-Hermitian Matrices
     关于斜Hermite矩阵乘积迹的不等式
短句来源
     The mean short path of the network product is equal to the sum of the mean short path of the networks.
     网络乘积的平均短程等于网络平均短程.
短句来源
     Hsu-Robbins Type Theorems for Pairwise Products Sums of I.I.D. Random Variables (Ⅱ)
     I.I.D.随机变量两两乘积的Hsu-Robbins型定理(Ⅱ)
短句来源
     Hsu-Robbins Type Theorems for Pairwise Products Sums of I.I.D. Random Variables (Ⅰ)
     I.I.D.随机变量两两乘积的Hsu-Robbins型定理(Ⅰ)
短句来源
     SOUND OF YEl O WHAMMER
     黄鸟
短句来源
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  product sum
When an inner product sum is ready it is written to a result SRAM which is not shown in the figure.
      


By using V. Pane's component theory and the variation principle, this paper studies the vibration of the orthotropic moderate thick plates. Taking the product of the beam vibration functions as the expression of the vibration mode of the plate. We obtain the differential equation of motion and the corresponding boundary conditions for some orthotropic moderate thick ractangular plates (H=(D_xD_y)~(1/2)·(G_(xz)/G_(yz))=(D_x)~(1/2)/(D_y)~(1/2) meanwhile, the formulae for the natural frequency and the vibration...

By using V. Pane's component theory and the variation principle, this paper studies the vibration of the orthotropic moderate thick plates. Taking the product of the beam vibration functions as the expression of the vibration mode of the plate. We obtain the differential equation of motion and the corresponding boundary conditions for some orthotropic moderate thick ractangular plates (H=(D_xD_y)~(1/2)·(G_(xz)/G_(yz))=(D_x)~(1/2)/(D_y)~(1/2) meanwhile, the formulae for the natural frequency and the vibration mode of the moderate thick rectangular plates are obtained, which may be conveniently used for engineering purposes.By reducing to the isotropie moderate thick rectangular plates with different thickness-span ratios and different supporting conditions, the results of calculated natural frequencies were compared with those obtained by the other papers, It can be seen that the results given by this paper may satisfy engineering requirements.

本文应用V·Panc~[1]的分量理论和能量变分原理作为分析基础,引入梁振动函数乘积和的形式来表达板的振型,建立了适于某些正交各向异性中厚板(H=(D_xD_y)~1/2·(G_(xz)/G_(yz))/((D_x)~(1/2))/((D_y)~(1/2))的振动微分方程,以及相应的边界条件:求得了便于工程中应用的正交各向异性中厚板的固有频率计算公式,以及振型计算公式。通过退化为各同性的四边简支、四边固支、两邻边简支、另二邻边固支的中厚板在若干种高跨比下固有频率的计算,且与有关文献中计算结果的比较,说明本文的计算结果可以满足工程中的要求。

It has been accepted that in metal-semiconductor contacts exist two kinds of current transport mechanisms (i.e., diffusion and thermionic emission) in series with each other. This knowledge is extended to the hotorojunctions in this paper. Calculations on GaAs-As junction show the different current transport mechanisms for different heterojunctions, some heterojunctions behave as pure diffusion junctions, others must be described in terms of the thermionic emission model. The calculated results predict a new...

It has been accepted that in metal-semiconductor contacts exist two kinds of current transport mechanisms (i.e., diffusion and thermionic emission) in series with each other. This knowledge is extended to the hotorojunctions in this paper. Calculations on GaAs-As junction show the different current transport mechanisms for different heterojunctions, some heterojunctions behave as pure diffusion junctions, others must be described in terms of the thermionic emission model. The calculated results predict a new phenomenon, in which the forward I-V characteristic of a pure diffusion heterojunction exhibits a negative resistance.A physical explanation is proposed.

本文把在金属-半导体接触中同时存在着扩散和热电子发射这样两种互相串联的电流传输机构这一看法推广到了异质结。以GaAs-Ge为例进行了计算,结果表明,对于不同掺杂的异质结,电流传输机构也不尽相同:有的象一个纯扩散机构的结,而另一些必须用热电子发射模型来描述。计算结果还预示,以扩散限制为主的异质结在正向Ⅰ—Ⅴ特性中将出现负阻,文中对此现象提出了一种物理解释。 文章最后对整个研究作了小结。提出新模型的讨论可能有助于对ΔE。测试结果进行合理的修正,对异质结伏—安特性进行合理的解释;也可能有助于建立各种情况下半导体内的边界条件,以及有助于澄清在np乘积和内建势等方面存在的理论上的争论。

This paper uses the starvation theory developed by Chit! to compute the starved EHL film thickness and the starvation-threshold speed in a miniature ball bearing.

本文应用Chiu的缺油理论,计算微型球轴承缺油的EHL膜厚和缺油开始的速度。为了说明理论的正确性,必须直接测出轴承中的平均膜厚。膜厚是用文献中所述的应变技术测量。测试结果和Hamrock-Dowson公式的理论预测值比较:在速度参数U小于10~(-10)时,两者有良好的一致性;但在速度参数较高时,由于缺油和进口剪切热效应,使膜厚比理论预测的小得多;然而缺油似乎是减小Hamrock-Dowson等温富油EHL理论值的主要原因。球轴承EHL实验揭示缺油程度随滚动速度和粘度而增加。滚动轴承中的缺油,是由于在前后两次接触间隔内补充到滚道中的油量不够充分。缺油后平坦区的膜厚决定于速度-粘度的乘积和缺油参数θ,后者包括油-气界面张力、压粘系数、球间距、接触形状和尺寸,以及滚道外边的膜厚。为了比较油和脂的润滑性能,对几种润滑剂在各种轴承速度下进行了膜厚的测量。本文主要目的在于:(a)实验测定油承中的膜厚;(b)确定缺油开始的速度;(c)确定膜厚减小程度;(d)分析影响缺油的因素和改进方法。

 
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