共变导数,Covariant derivative,在线英语词典,英文翻译,专业英语

1) Covariant derivative

共变导数

2) covariation

共变

To solve the problem that the-spectrum estimation performance based on covariation under the-stable noise environmentbecomes obviously worse when the distribution parameter is small,a method of fractional low-order covariance(FLOC) spectrum estimation was proposed.

针对在分布参数值较小时稳定分布噪声下基于共变的谱估计性能较差这一问题,提出了一种分数低阶协方差(FLOC)谱估计方法。

After introducing the fractional lower order statistics,including the covariation and the fractional order correlation(FOC),a new method of 2-D direction finding based on the fractional order correlation for underwater 2-D source localization using a vector hydrophones array under al.

利用稳定分布对实际中所遇到的具有较大脉冲特性的随机噪声进行建模,分析了共变在阵列信号处理中的不足,利用已有的矢量水听器模型建立一种水下目标定向系统,提出了一种基于分数阶相关的水下目标定向算法。

3) covariance

共变

This paper, based on the theory of Covariance, endeavors to analyze the covariance of language and society through comparing the old vocabularies, new vocabularies and loan vocabularies from the perspective of the historical development in Chinese vocabularies.

以美国社会语言学家布赖特提出的"语言和社会结构共变"理论(Covariance)为依据,从语言中最敏感的词汇(旧词、新词、外来词)的角度出发,可以看出语言和社会存在着一定的"共变"关系。

The paper studies five main characteristics of Internet English vocabulary and thus proves the principle that the formation and development of Internet English words is the result of the covariance of language and society.

该文探讨了网络英语词汇形成的系列化、缩略法、修辞手段、旧词新义、词汇变体等特点 ,从而揭示了网络英语词汇的产生、发展是语言与社会“共变”关系的产物这一规

4) co-variation

共变

This paper discusses the relations of "co-variation" between society and language from sociolinguistics.

笔者从社会语言学角度探讨了社会与语言之间的“共变”关系。

This article points out that the relationship between education and society is co-variation.

在分析两种偏颇论点的基础上,指出教育与社会是一种共变的关系。

5) covariation matrix

共变矩阵

In the presence of impulsive noise,the two received signals are combinated,so the estimated impulse response of the channel is the eigenvector of its covariation matrix corresponding to the smallest eigenvalue,which can be realized adaptively using generalization o.

该算法在脉冲噪声环境下,组合两个接收信号,使其共变矩阵最小特征值对应的特征向量为信道的估计,并基于广义归一化最小平均p范数(广义NLM P)方法自适应得到该特征向量,从而获得时延估计。

6) public ratio of transformation

公共变比

Combination usage of threephase power meter with threephase potential transformer and threephase current transformer extends the range of the power meter,and puts forward the concept of the public ratio of transformation, and solves the exactitude of the power computation when public transformation ratio of mutual inductor is inconformit

电压互感器、电流互感器和三相功率表结合使用 ,扩大了功率表的量限 ,并提出了公共变比的概念 ,解决了互感器变比不一致时三相功率的正确计

参考词条

共变影响共变算子共变对称共变法共生共变共变信息互动共变共变原则共变关系共变表示共变论纽共变系统共变算子对共变音理论滑动t检验法红豆草高产栽培

补充资料：共变导数

共变导数
covanant derivative

共变导数!田栩对叨t deri拍柱ve;.叮.脚胭叨，幽碑口曰.肠圈〕导数概念在流形上不同几何对象的范围内的推广，这些几何对象是向量，张量，形式等.它是关于流形M上向量场X定义的，作用在具有给定指标类型的张量场Ts『(M)的模上的一个线性算子气7尤，并满足下列性质: l)殊十。，U=fvxU+夕v:U， 2)vx(f功习又U+(Xj)u，这里U‘叮(M)，f和g是M上可微函数.利用直线性，这个映射被平凡地延拓到张量场代数，此外，对在不同指标类型的张量U，V上的作用还要求成立: 7x(U。均=甲xUOV+UO甲xV，这里⑧表示张量积.于是，马是张量场代数上的一个导子(见环中的导子(derivation in a ring)):它具有和张量的缩并运算(见张一的缩并(contraction of a tensor))，张量的斜对称化运算(见交错(aitemation”以及张量的对称化运算(见对称化(张一的)(sytnmetrizatlon(of tensors))可交换的性质. 马(对向量场)的性质l)和2)允许在M上引人一个线性联络(以及对应的平行移动)，根据它们，可以给出共变导数的局部定义，这个共变导数延拓到整个流形上时与上面定义的算子马一致;也见共变微分法(cov-ariant differentiation).HX助6“ro。撰【补注】共变导数和共变微分法之间没有多少区别，两者按相同的意义使用.潘养廉译

说明：补充资料仅用于学习参考，请勿用于其它任何用途。

首页 \| 翻译 \| 影视 \| 论坛 \| 索引共变系数共变序列共变谱共变函数共变有限共变函子

1) Covariant derivative 共变导数 2) covariation 共变 1. To solve the problem that the-spectrum estimation performance based on covariation under the-stable noise environmentbecomes obviously worse when the distribution parameter is small,a method of fractional low-order covariance(FLOC) spectrum estimation was proposed. 针对在分布参数值较小时稳定分布噪声下基于共变的谱估计性能较差这一问题,提出了一种分数低阶协方差(FLOC)谱估计方法。 2. After introducing the fractional lower order statistics,including the covariation and the fractional order correlation(FOC),a new method of 2-D direction finding based on the fractional order correlation for underwater 2-D source localization using a vector hydrophones array under al. 利用稳定分布对实际中所遇到的具有较大脉冲特性的随机噪声进行建模,分析了共变在阵列信号处理中的不足,利用已有的矢量水听器模型建立一种水下目标定向系统,提出了一种基于分数阶相关的水下目标定向算法。 3) covariance 共变 1. This paper, based on the theory of Covariance, endeavors to analyze the covariance of language and society through comparing the old vocabularies, new vocabularies and loan vocabularies from the perspective of the historical development in Chinese vocabularies. 以美国社会语言学家布赖特提出的"语言和社会结构共变"理论(Covariance)为依据,从语言中最敏感的词汇(旧词、新词、外来词)的角度出发,可以看出语言和社会存在着一定的"共变"关系。 2. The paper studies five main characteristics of Internet English vocabulary and thus proves the principle that the formation and development of Internet English words is the result of the covariance of language and society. 该文探讨了网络英语词汇形成的系列化、缩略法、修辞手段、旧词新义、词汇变体等特点 ,从而揭示了网络英语词汇的产生、发展是语言与社会“共变”关系的产物这一规 4) co-variation 共变 1. This paper discusses the relations of "co-variation" between society and language from sociolinguistics. 笔者从社会语言学角度探讨了社会与语言之间的“共变”关系。 2. This article points out that the relationship between education and society is co-variation. 在分析两种偏颇论点的基础上,指出教育与社会是一种共变的关系。 5) covariation matrix 共变矩阵 1. In the presence of impulsive noise,the two received signals are combinated,so the estimated impulse response of the channel is the eigenvector of its covariation matrix corresponding to the smallest eigenvalue,which can be realized adaptively using generalization o. 该算法在脉冲噪声环境下,组合两个接收信号,使其共变矩阵最小特征值对应的特征向量为信道的估计,并基于广义归一化最小平均p范数(广义NLM P)方法自适应得到该特征向量,从而获得时延估计。 6) public ratio of transformation 公共变比 1. Combination usage of threephase power meter with threephase potential transformer and threephase current transformer extends the range of the power meter,and puts forward the concept of the public ratio of transformation, and solves the exactitude of the power computation when public transformation ratio of mutual inductor is inconformit 电压互感器、电流互感器和三相功率表结合使用 ,扩大了功率表的量限 ,并提出了公共变比的概念 ,解决了互感器变比不一致时三相功率的正确计参考词条共变影响共变算子共变对称共变法共生共变共变信息互动共变共变原则共变关系共变表示共变论纽共变系统共变算子对共变音理论滑动t检验法红豆草高产栽培补充资料：共变导数共变导数 covanant derivative 共变导数!田栩对叨t deri拍柱ve;.叮.脚胭叨，幽碑口曰.肠圈〕导数概念在流形上不同几何对象的范围内的推广，这些几何对象是向量，张量，形式等.它是关于流形M上向量场X定义的，作用在具有给定指标类型的张量场Ts『(M)的模上的一个线性算子气7尤，并满足下列性质: l)殊十。，U=fvxU+夕v:U， 2)vx(f功习又U+(Xj)u，这里U‘叮(M)，f和g是M上可微函数.利用直线性，这个映射被平凡地延拓到张量场代数，此外，对在不同指标类型的张量U，V上的作用还要求成立: 7x(U。均=甲xUOV+UO甲xV，这里⑧表示张量积.于是，马是张量场代数上的一个导子(见环中的导子(derivation in a ring)):它具有和张量的缩并运算(见张一的缩并(contraction of a tensor))，张量的斜对称化运算(见交错(aitemation”以及张量的对称化运算(见对称化(张一的)(sytnmetrizatlon(of tensors))可交换的性质. 马(对向量场)的性质l)和2)允许在M上引人一个线性联络(以及对应的平行移动)，根据它们，可以给出共变导数的局部定义，这个共变导数延拓到整个流形上时与上面定义的算子马一致;也见共变微分法(cov-ariant differentiation).HX助6“ro。撰【补注】共变导数和共变微分法之间没有多少区别，两者按相同的意义使用.潘养廉译说明：补充资料仅用于学习参考，请勿用于其它任何用途。
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