The relationship between mankind and nature as well mankind and climate was introduced firstly, and then the necessity to remove negative value accompanying the improvement of humanized nature value was analyzed, fina...The relationship between mankind and nature as well mankind and climate was introduced firstly, and then the necessity to remove negative value accompanying the improvement of humanized nature value was analyzed, finally the ways to insist on the unity of natural view and development view to realize the harmony between mankind and climate were proposed.展开更多
In this article, the authors consider the nonlinear elliptic systems under the natural growth condition. They use a new method introduced by Duzaar and Grotowski, for proving partial regularity for weak solutions, bas...In this article, the authors consider the nonlinear elliptic systems under the natural growth condition. They use a new method introduced by Duzaar and Grotowski, for proving partial regularity for weak solutions, based on a generalization of the technique of harmonic approximation. And directly establish the optimal Holder exponent for the derivative of a weak solution.展开更多
A ship is operated under an extremely complex environment, and waves and winds are assumed to be the stochastic excitations. Moreover, the propeller, host and mechanical equipment can also induce the harmonic response...A ship is operated under an extremely complex environment, and waves and winds are assumed to be the stochastic excitations. Moreover, the propeller, host and mechanical equipment can also induce the harmonic responses. In order to reduce structural vibration, it is important to obtain the modal parameters information of a ship. However, the traditional modal parameter identification methods are not suitable since the excitation information is difficult to obtain. Natural excitation technique-eigensystem realization algorithm （NExT-ERA） is an operational modal identification method which abstracts modal parameters only from the response signals, and it is based on the assumption that the input to the structure is pure white noise. Hence, it is necessary to study the influence of harmonic excitations while applying the NExT-ERA method to a ship structure. The results of this research paper indicate the practical experiences under ambient excitation, ship model experiments were successfully done in the modal parameters identification only when the harmonic frequencies were not too close to the modal frequencies.展开更多
William Wordsworth,as the representative poet of the romanticism,plays an important role in the history of the EnglishLiterature and is considered an ecological poet.He pursues the harmonious and unified relationship ...William Wordsworth,as the representative poet of the romanticism,plays an important role in the history of the EnglishLiterature and is considered an ecological poet.He pursues the harmonious and unified relationship with man and nature,and con-tributes to the development process of the social.Taking the poem"Nutting"for example,Wordsworth’s ecological view of natureand its reasons,and the realistic significance of his view on nature to the modern world,especially under the background of the ad-vocacy of the community of destiny of human beings,will be explicated and analyzed.展开更多
We consider the questions of boundary regularity for weak solutions of second-order nonlinear elliptic systems under the natural growth condition. We obtain a general criterion for a weak solution to be regular in the...We consider the questions of boundary regularity for weak solutions of second-order nonlinear elliptic systems under the natural growth condition. We obtain a general criterion for a weak solution to be regular in the neighborhood of a given boundary point. The proof yields directly the optimal regularity for the solution in this neighborhood. This result is new for the situation under the natural growth conditions.展开更多
文摘The relationship between mankind and nature as well mankind and climate was introduced firstly, and then the necessity to remove negative value accompanying the improvement of humanized nature value was analyzed, finally the ways to insist on the unity of natural view and development view to realize the harmony between mankind and climate were proposed.
基金Supported by NSF of China(10531020)the Program of 985 Innovation Engieering on Information in Xiamen University(2004-2007).
文摘In this article, the authors consider the nonlinear elliptic systems under the natural growth condition. They use a new method introduced by Duzaar and Grotowski, for proving partial regularity for weak solutions, based on a generalization of the technique of harmonic approximation. And directly establish the optimal Holder exponent for the derivative of a weak solution.
基金Supported by the National Natural Science Foundation of China（51079027）
文摘A ship is operated under an extremely complex environment, and waves and winds are assumed to be the stochastic excitations. Moreover, the propeller, host and mechanical equipment can also induce the harmonic responses. In order to reduce structural vibration, it is important to obtain the modal parameters information of a ship. However, the traditional modal parameter identification methods are not suitable since the excitation information is difficult to obtain. Natural excitation technique-eigensystem realization algorithm （NExT-ERA） is an operational modal identification method which abstracts modal parameters only from the response signals, and it is based on the assumption that the input to the structure is pure white noise. Hence, it is necessary to study the influence of harmonic excitations while applying the NExT-ERA method to a ship structure. The results of this research paper indicate the practical experiences under ambient excitation, ship model experiments were successfully done in the modal parameters identification only when the harmonic frequencies were not too close to the modal frequencies.
文摘William Wordsworth,as the representative poet of the romanticism,plays an important role in the history of the EnglishLiterature and is considered an ecological poet.He pursues the harmonious and unified relationship with man and nature,and con-tributes to the development process of the social.Taking the poem"Nutting"for example,Wordsworth’s ecological view of natureand its reasons,and the realistic significance of his view on nature to the modern world,especially under the background of the ad-vocacy of the community of destiny of human beings,will be explicated and analyzed.
基金Supported by NSF(No. 10531020) of Chinathe Program of 985 Innovation Engineering on Information in Xiamen University (2004-2007) and NCETXMU
文摘We consider the questions of boundary regularity for weak solutions of second-order nonlinear elliptic systems under the natural growth condition. We obtain a general criterion for a weak solution to be regular in the neighborhood of a given boundary point. The proof yields directly the optimal regularity for the solution in this neighborhood. This result is new for the situation under the natural growth conditions.
