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.

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.

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.

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.

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

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

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.

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