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This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.

This paper has been withdrawn by the authors due to some fatal errors in the analysis.

This article was withdrawn by the arXiv.org administrators since it plagiarizes math.AT/0401211.

This paper has been withdrawn by the author due to text overlap with arXiv:1102.5004, as well as omission of proper citations to arXiv:1110.4655 and arXiv:1111.0313

This paper has been withdrawn by the author, due a crucial mistake in proof of lemma 4.2.

This paper has been withdrawn by the authors, due to issues concerning the use of unpublished experimental data.

This paper has been withdrawn by the author due a few mistakes in the paper.

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This paper has been withdrawn by the author(s). Please refer to quant-ph/0311171.

This paper has been withdrawn by the author due to a crucial sign error in equation 1

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This paper has been withdrawn by the authors. Because of a misunderstanding, the paper was submitted prematurely to the arXiv. A replacement will follow.

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This paper has been withdrawn by the author due to a crucial sign error in Theorem 3.4.

The article is withdrawn. Its content is contained in the final version of arXiv:0805.1634.