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This paper has been withdrawn by the author due to inconsistency of the considered working hypothesis. The consistent treatment is presented in the last publications of the author.

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This paper has been withdrawn by the author because of copyright reasons.

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This paper has been withdrawn by the author.

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This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.

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This paper was withdrawn by the author. It turns out that similar ideas have been presented before. The author apologizes.

This paper has been withdrawn by the authors due to some fatal errors in the analysis.