地表侵蚀速率是衡量地貌演化的一个重要因子。本研究利用原地宇宙成因核素^(10)Be和26Al对合黎山西南部地表岩石侵蚀速率进行了首次测定。结果显示:约30 ka以来,合黎山西南部的地表岩石侵蚀速率约为24 mm?ka^(-1)。这一结果与已见报道...地表侵蚀速率是衡量地貌演化的一个重要因子。本研究利用原地宇宙成因核素^(10)Be和26Al对合黎山西南部地表岩石侵蚀速率进行了首次测定。结果显示:约30 ka以来,合黎山西南部的地表岩石侵蚀速率约为24 mm?ka^(-1)。这一结果与已见报道的其他基岩侵蚀速率值一致。这一结果与Small et al获得的非干旱地区的基岩侵蚀速率也基本一致,但是显著高于干旱的南极地区和半干旱的澳大利亚。^(10)Be和26Al获得的侵蚀速率的良好一致性表明本研究中所用侵蚀模式的有效性。所得的侵蚀速率小于Palumbo et al测定的合黎山平均流域侵蚀速率(99 mm?ka-1),原因解释尚待更多地点和样品的研究。展开更多
This paper offers a study of J.L.Lagrange's research on history of mathematics,aiming to clarify Lagrange's intention in carrying out historical work.To this end,I first document how Lagrange worked with and e...This paper offers a study of J.L.Lagrange's research on history of mathematics,aiming to clarify Lagrange's intention in carrying out historical work.To this end,I first document how Lagrange worked with and exerted his influence on other scholars in the translation and diffusion of ancient Greek texts.Second,investigating Lagrange's style in doing and writing history of mathematics,this paper takes a new perspective and elucidates his motivation in these activities.In particular,it focuses on Lagrange's presentation of the history of calculus while he was teaching analysis at the Ecole Polytechnique(1795-1799)so as to clarify the function of history in Lagrange's mathematical works.My thesis is that Lagrange's intention in examining the different methods employed by his predecessors was to find inspiration and useful contents in his search for the proper approach to mathematical problems.I thus argue in this paper that history served as a guide or methodology for Lagrange's mathematics.Meanwhile,through an analysis of his historical writing,this paper points to four epistemological values according to which Lagrange judged various historical methods of differential calculus:generality,simplicity,clarity,and rigor.Lagrange's move to rigorize analysis was connected to his interest in and research of Greek texts;he was attempting to introduce the rigor of the ancient Greeks'demonstration in his works of analysis.展开更多
In l,ebanon, hybrid wind/PV systems are used to provide electricity when the public electricity is cut off This paper treats the storage problems of electrical energy generated by the used renewable sources. A theoret...In l,ebanon, hybrid wind/PV systems are used to provide electricity when the public electricity is cut off This paper treats the storage problems of electrical energy generated by the used renewable sources. A theoretical study on two types of electrical energy storage systems is given. These systems are the electrochemical energy storage devices （batteries） and the potential （or hydraulic） energy storage system. In order to find the limiting case of use between these two energy storage systems, economical study and comparison between them are discussed and analyzed.展开更多
The conjugate of T-connection in a Riemannian manifold is obtained, also some of its properties are studied. T-statistical manifold is defined and was considered. Finally a characteristic vector field of the deformati...The conjugate of T-connection in a Riemannian manifold is obtained, also some of its properties are studied. T-statistical manifold is defined and was considered. Finally a characteristic vector field of the deformation algebra （M, , ） is also obtained.展开更多
In the present paper,the authors study totally real 2-harmonic submanifolds in a complex space form and obtain a Simons' type integral inequality of compact submanifolds as well as some relevant conclusions.
The Wudongde Hydropower Station aims to power economic growth A bright new era for hydropower stations was ushered in when Laurent Fabius,Chairman of the UN Climate Change Conference in Paris and also the French Forei...The Wudongde Hydropower Station aims to power economic growth A bright new era for hydropower stations was ushered in when Laurent Fabius,Chairman of the UN Climate Change Conference in Paris and also the French Foreign Minister,brought down his gavel,announcingthe birth of the Paris Agreement on Climate Change on December 12, 2015.展开更多
In this paper,we investigate group-invariant solutions to the hyperbolic geometric flow on Riemann surfaces,which include solutions of separation variables,traveling wave solutions,self-similar solutions and radial so...In this paper,we investigate group-invariant solutions to the hyperbolic geometric flow on Riemann surfaces,which include solutions of separation variables,traveling wave solutions,self-similar solutions and radial solutions.In the proceeding of reduction,there are elliptic,hyperbolic and mixed types of equations.For the first kind of equation,some exact solutions are found;while for the last two kinds,with implicit solutions found,we furthermore investigate whether there will be a global solution or blowing up.Referring to the work of Kong et al.(2009),the results come out perfectly.展开更多
文摘地表侵蚀速率是衡量地貌演化的一个重要因子。本研究利用原地宇宙成因核素^(10)Be和26Al对合黎山西南部地表岩石侵蚀速率进行了首次测定。结果显示:约30 ka以来,合黎山西南部的地表岩石侵蚀速率约为24 mm?ka^(-1)。这一结果与已见报道的其他基岩侵蚀速率值一致。这一结果与Small et al获得的非干旱地区的基岩侵蚀速率也基本一致,但是显著高于干旱的南极地区和半干旱的澳大利亚。^(10)Be和26Al获得的侵蚀速率的良好一致性表明本研究中所用侵蚀模式的有效性。所得的侵蚀速率小于Palumbo et al测定的合黎山平均流域侵蚀速率(99 mm?ka-1),原因解释尚待更多地点和样品的研究。
文摘This paper offers a study of J.L.Lagrange's research on history of mathematics,aiming to clarify Lagrange's intention in carrying out historical work.To this end,I first document how Lagrange worked with and exerted his influence on other scholars in the translation and diffusion of ancient Greek texts.Second,investigating Lagrange's style in doing and writing history of mathematics,this paper takes a new perspective and elucidates his motivation in these activities.In particular,it focuses on Lagrange's presentation of the history of calculus while he was teaching analysis at the Ecole Polytechnique(1795-1799)so as to clarify the function of history in Lagrange's mathematical works.My thesis is that Lagrange's intention in examining the different methods employed by his predecessors was to find inspiration and useful contents in his search for the proper approach to mathematical problems.I thus argue in this paper that history served as a guide or methodology for Lagrange's mathematics.Meanwhile,through an analysis of his historical writing,this paper points to four epistemological values according to which Lagrange judged various historical methods of differential calculus:generality,simplicity,clarity,and rigor.Lagrange's move to rigorize analysis was connected to his interest in and research of Greek texts;he was attempting to introduce the rigor of the ancient Greeks'demonstration in his works of analysis.
文摘In l,ebanon, hybrid wind/PV systems are used to provide electricity when the public electricity is cut off This paper treats the storage problems of electrical energy generated by the used renewable sources. A theoretical study on two types of electrical energy storage systems is given. These systems are the electrochemical energy storage devices （batteries） and the potential （or hydraulic） energy storage system. In order to find the limiting case of use between these two energy storage systems, economical study and comparison between them are discussed and analyzed.
文摘The conjugate of T-connection in a Riemannian manifold is obtained, also some of its properties are studied. T-statistical manifold is defined and was considered. Finally a characteristic vector field of the deformation algebra （M, , ） is also obtained.
基金Natural Science Foundation of Education Department of Anhui Province （No. 2004kj166zd）.
文摘In the present paper,the authors study totally real 2-harmonic submanifolds in a complex space form and obtain a Simons' type integral inequality of compact submanifolds as well as some relevant conclusions.
文摘The Wudongde Hydropower Station aims to power economic growth A bright new era for hydropower stations was ushered in when Laurent Fabius,Chairman of the UN Climate Change Conference in Paris and also the French Foreign Minister,brought down his gavel,announcingthe birth of the Paris Agreement on Climate Change on December 12, 2015.
文摘In this paper,we investigate group-invariant solutions to the hyperbolic geometric flow on Riemann surfaces,which include solutions of separation variables,traveling wave solutions,self-similar solutions and radial solutions.In the proceeding of reduction,there are elliptic,hyperbolic and mixed types of equations.For the first kind of equation,some exact solutions are found;while for the last two kinds,with implicit solutions found,we furthermore investigate whether there will be a global solution or blowing up.Referring to the work of Kong et al.(2009),the results come out perfectly.
