Lithium ion batteries are complicated distributed parameter systems that can be described preferably by partial differential equations and a field theory. To reduce the solution difficulty and the calculation amount, ...Lithium ion batteries are complicated distributed parameter systems that can be described preferably by partial differential equations and a field theory. To reduce the solution difficulty and the calculation amount, if a distributed parameter system is described by ordinary differential equations （ODE） during the analysis and the design of distributed parameter system, the reliability of the system description will be reduced, and the systemic errors will be introduced. Studies on working condition real-time monitoring can improve the security because the rechargeable LIBs are widely used in many electronic systems and electromechanical equipment. Single particle model （SPM） is the simplification of LIB under some approximations, and can estimate the working parameters of a LIB at the faster simulation speed. A LIB modelling algorithm based on PDEs and SPM is proposed to monitor the working condition of LIBs in real time. Although the lithium ion concentration is an unmeasurable distributed parameter in the anode of LIB, the working condition monitoring model can track the real time lithium ion concentration in the anode of LIB, and calculate the residual which is the difference between the ideal data and the measured data. A fault alarm can be triggered when the residual is beyond the preset threshold. A simulation example verifies that the effectiveness and the accuracy of the working condition real-time monitoring model of LIB based on PDEs and SPM.展开更多
This paper mainly is study on power system working state with neutral point different grounded methods, when the power system is normal working and the single-phase grounding. And further analysis of the different ope...This paper mainly is study on power system working state with neutral point different grounded methods, when the power system is normal working and the single-phase grounding. And further analysis of the different operating modes of voltage and current relationships, expounds the different operation occasions and characteristics.展开更多
As it is evident from the practice of construction and maintenance of thin retaining walls, the degree of developing of frictional forces in interlock connections of steel sheet U-shape piles essentially influences th...As it is evident from the practice of construction and maintenance of thin retaining walls, the degree of developing of frictional forces in interlock connections of steel sheet U-shape piles essentially influences the realization of the values of geometric characteristics of the piles cross-section （the moment of inertia and the section modulus） reduced to the length unit of the construction. The article offers new and simple solutions for realization and economically effective technological approaches to provide joint work of the sheet piles being considered, which improve the adequacy of design and reliability of maintenance of thin retaining walls.展开更多
This essay is written in the form of a mosaic. It intersperses simple language, primary and secondary quotes within text, footnotes and epigraphs from classical thinkers and cutting-edge researchers. It invites reader...This essay is written in the form of a mosaic. It intersperses simple language, primary and secondary quotes within text, footnotes and epigraphs from classical thinkers and cutting-edge researchers. It invites readers, be they casual or experienced, to a certain play of irony and fantasy in their reflection on the main thrust of the argument. The essay is divided into two parts. The first seeks to introduce the readers to some of the main concerns of frontier science and the Philosophy of Science at the beginning of this millennium： the Universe Models proposed by scientists from fields related to Physics and Mathematics in their eagerness to explain more and more discoveries and to lay out a solid new scientific paradigm. We are convinced that the leap between sidelines and insides--when confronting straightforward style with systematic contrast--does not lessen the rigor of research, and serves to lighten the density of the topic by projecting nuances and resonance onto the logos and its concatenation. It may also serve to vivify field and figure, in order to recreate the fertile delight that generally comes from a good reading of deep intertext.In the second part, we attempt to subtly demonstrate a fortunate discovery： the validity and solidity of the laws of Nature, upheld on the basis of their abstract mathematical expression （the Number Phi （φ）, the goldennumber or golden section）, which despite having faded into oblivion, buried under centuries of disuse in the fields of Aesthetics and Art, has proven to be useful as a critical instrument and a template for concrete solutions that we wish to share. We believe that this Model may serve not only to answer some of the scientific issues that we have referred to, but to redirect the discussion itself, and break the logjam of many frontier forums that place conditions on the application of the Models pro- duced over the last century. Having glimpsed those realms where analysis and common sense come together for addressing one of the most salient issues of our time, we chose to close the essay by offering practical, concrete findings on the topic of Models, which not only specialists in the field may find useful, but also any reader, especially educators, who are charged with sharing these findings with the present and future generations.展开更多
文摘Lithium ion batteries are complicated distributed parameter systems that can be described preferably by partial differential equations and a field theory. To reduce the solution difficulty and the calculation amount, if a distributed parameter system is described by ordinary differential equations （ODE） during the analysis and the design of distributed parameter system, the reliability of the system description will be reduced, and the systemic errors will be introduced. Studies on working condition real-time monitoring can improve the security because the rechargeable LIBs are widely used in many electronic systems and electromechanical equipment. Single particle model （SPM） is the simplification of LIB under some approximations, and can estimate the working parameters of a LIB at the faster simulation speed. A LIB modelling algorithm based on PDEs and SPM is proposed to monitor the working condition of LIBs in real time. Although the lithium ion concentration is an unmeasurable distributed parameter in the anode of LIB, the working condition monitoring model can track the real time lithium ion concentration in the anode of LIB, and calculate the residual which is the difference between the ideal data and the measured data. A fault alarm can be triggered when the residual is beyond the preset threshold. A simulation example verifies that the effectiveness and the accuracy of the working condition real-time monitoring model of LIB based on PDEs and SPM.
文摘This paper mainly is study on power system working state with neutral point different grounded methods, when the power system is normal working and the single-phase grounding. And further analysis of the different operating modes of voltage and current relationships, expounds the different operation occasions and characteristics.
文摘As it is evident from the practice of construction and maintenance of thin retaining walls, the degree of developing of frictional forces in interlock connections of steel sheet U-shape piles essentially influences the realization of the values of geometric characteristics of the piles cross-section （the moment of inertia and the section modulus） reduced to the length unit of the construction. The article offers new and simple solutions for realization and economically effective technological approaches to provide joint work of the sheet piles being considered, which improve the adequacy of design and reliability of maintenance of thin retaining walls.
文摘This essay is written in the form of a mosaic. It intersperses simple language, primary and secondary quotes within text, footnotes and epigraphs from classical thinkers and cutting-edge researchers. It invites readers, be they casual or experienced, to a certain play of irony and fantasy in their reflection on the main thrust of the argument. The essay is divided into two parts. The first seeks to introduce the readers to some of the main concerns of frontier science and the Philosophy of Science at the beginning of this millennium： the Universe Models proposed by scientists from fields related to Physics and Mathematics in their eagerness to explain more and more discoveries and to lay out a solid new scientific paradigm. We are convinced that the leap between sidelines and insides--when confronting straightforward style with systematic contrast--does not lessen the rigor of research, and serves to lighten the density of the topic by projecting nuances and resonance onto the logos and its concatenation. It may also serve to vivify field and figure, in order to recreate the fertile delight that generally comes from a good reading of deep intertext.In the second part, we attempt to subtly demonstrate a fortunate discovery： the validity and solidity of the laws of Nature, upheld on the basis of their abstract mathematical expression （the Number Phi （φ）, the goldennumber or golden section）, which despite having faded into oblivion, buried under centuries of disuse in the fields of Aesthetics and Art, has proven to be useful as a critical instrument and a template for concrete solutions that we wish to share. We believe that this Model may serve not only to answer some of the scientific issues that we have referred to, but to redirect the discussion itself, and break the logjam of many frontier forums that place conditions on the application of the Models pro- duced over the last century. Having glimpsed those realms where analysis and common sense come together for addressing one of the most salient issues of our time, we chose to close the essay by offering practical, concrete findings on the topic of Models, which not only specialists in the field may find useful, but also any reader, especially educators, who are charged with sharing these findings with the present and future generations.
