This paper concentrates on studying the symmetries and a new type of conserved quantities called Mei conserved quantity. The criterions of the Mei symmetry, the Noether symmetry and the Lie symmetry are given. The con...This paper concentrates on studying the symmetries and a new type of conserved quantities called Mei conserved quantity. The criterions of the Mei symmetry, the Noether symmetry and the Lie symmetry are given. The conditions and the forms of the Mei conserved quantities deduced from these three symmetries are obtained. An example is given to illustrate the application of the result.展开更多
The Chinese government attaches great importance to the social security system, and makes it as an important pillar of socialist market economic system. Especially in the last decade, we seize the sustained, rapid and...The Chinese government attaches great importance to the social security system, and makes it as an important pillar of socialist market economic system. Especially in the last decade, we seize the sustained, rapid and healthy development of the favorable opportunity of the construction of social security system; we have made unremitting efforts and achieved important progress. After years of exploration and practice, we have a clear basic principles of the social security system and the overall objectives and major tasks, we also established social pooling and individual accounts of the basic old-age insurance, basic medical insurance system, covering pension, medical, unemployment, work injury and maternity insurance, the urban minimum living security system and the framework of the social security system basically forms. The coverage of social insurance continuously expands social security funds which are through nmltiple channels to raise the initial formation mechanism forms, the level of protection continuously improves, and management and service system also gradually improves. The social security system＇ s reform and development plays a very important role in ensuring the basic livelihood of the people, the state-owned enterprise reform, and the smooth progress of economic restructuring.展开更多
The problem of guaranteed cost control based on finite-time stability for stochastic system is first investigated in this paper.The motivation of solving this problem arises from an observation that finite/infinite-ho...The problem of guaranteed cost control based on finite-time stability for stochastic system is first investigated in this paper.The motivation of solving this problem arises from an observation that finite/infinite-horizon guaranteed cost control does not consider the transient performance of the closed-loop system,but guaranteed cost control based on finite-time stability involves this practical requirement.In order to explain this problem explicitly,a concept of the stochastic finite-time guaranteed cost control is introduced,and then some new sufficient conditions for the existence of state and output feedback finite-time guaranteed cost controllers are derived,which guarantee finite-time stochastic stability of closed-loop systems and an upper bound of a quadratic cost function.Furthermore,this problem is reduced to a convex optimization problem with matrix inequality constraints and a new solving algorithm is given.Finally,an example is given to illustrate the effectiveness of the proposed method.展开更多
Many domestic and international scholars have done a wide range of researches on electromagnetic and technology and have made some achievements. Electromagnetic technology has been used in forest pests control as a c...Many domestic and international scholars have done a wide range of researches on electromagnetic and technology and have made some achievements. Electromagnetic technology has been used in forest pests control as a convenient and high-efficient physics means. This article summaries the current study of the electromagnetic biological effect and introduces the appfication of microwave, pulsed electromagnetic field and electrostatic field to forest pests control. The research direction and prospect of the application of electromagnetic theory and technology to forest pests control arc also discussed.展开更多
基金The project supported by the Graduate Student＇s Innovative Foundation of China University of Petroleum （East China） under Grant No. S2006-31 .
文摘This paper concentrates on studying the symmetries and a new type of conserved quantities called Mei conserved quantity. The criterions of the Mei symmetry, the Noether symmetry and the Lie symmetry are given. The conditions and the forms of the Mei conserved quantities deduced from these three symmetries are obtained. An example is given to illustrate the application of the result.
文摘The Chinese government attaches great importance to the social security system, and makes it as an important pillar of socialist market economic system. Especially in the last decade, we seize the sustained, rapid and healthy development of the favorable opportunity of the construction of social security system; we have made unremitting efforts and achieved important progress. After years of exploration and practice, we have a clear basic principles of the social security system and the overall objectives and major tasks, we also established social pooling and individual accounts of the basic old-age insurance, basic medical insurance system, covering pension, medical, unemployment, work injury and maternity insurance, the urban minimum living security system and the framework of the social security system basically forms. The coverage of social insurance continuously expands social security funds which are through nmltiple channels to raise the initial formation mechanism forms, the level of protection continuously improves, and management and service system also gradually improves. The social security system＇ s reform and development plays a very important role in ensuring the basic livelihood of the people, the state-owned enterprise reform, and the smooth progress of economic restructuring.
基金supported by the National Natural Science Foundation of China under Grant Nos.61403221,61473202 and 61174078Natural Science Foundation of Shandong Province under Grant No.ZR2013FM022+2 种基金the Research Fund for the Taishan Scholar Project of Shandong Province of Chinathe SDUST Research Fund under Grant No.2011KYTD105the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources under Grant No.LAPS13018
文摘The problem of guaranteed cost control based on finite-time stability for stochastic system is first investigated in this paper.The motivation of solving this problem arises from an observation that finite/infinite-horizon guaranteed cost control does not consider the transient performance of the closed-loop system,but guaranteed cost control based on finite-time stability involves this practical requirement.In order to explain this problem explicitly,a concept of the stochastic finite-time guaranteed cost control is introduced,and then some new sufficient conditions for the existence of state and output feedback finite-time guaranteed cost controllers are derived,which guarantee finite-time stochastic stability of closed-loop systems and an upper bound of a quadratic cost function.Furthermore,this problem is reduced to a convex optimization problem with matrix inequality constraints and a new solving algorithm is given.Finally,an example is given to illustrate the effectiveness of the proposed method.
基金Supported by the National Nature Science Foundation of China (grant No. 30471384 )
文摘Many domestic and international scholars have done a wide range of researches on electromagnetic and technology and have made some achievements. Electromagnetic technology has been used in forest pests control as a convenient and high-efficient physics means. This article summaries the current study of the electromagnetic biological effect and introduces the appfication of microwave, pulsed electromagnetic field and electrostatic field to forest pests control. The research direction and prospect of the application of electromagnetic theory and technology to forest pests control arc also discussed.
