With the increasing trend of globalization and the rapid advancement of information technology,online learning platforms such as Zoom are becoming increasingly influential in the field of education.The focus of this s...With the increasing trend of globalization and the rapid advancement of information technology,online learning platforms such as Zoom are becoming increasingly influential in the field of education.The focus of this study was the online international peer interaction based on the Zoom platform,detailing how such interaction programs are conducted and exploring in depth the specific impacts of this interaction mode on students’comprehensive competencies,global perspectives,and cross-cultural communication skills.This research not only provides new practical references for online learning and international education but also offers new research perspectives and directions for educators and researchers.展开更多
The basic equations of free capillary_gravity surface_waves in a circular cylindrical basin were derived from Luke's principle. Taking Galerkin's expansion of the velocity potential and the free surface elevat...The basic equations of free capillary_gravity surface_waves in a circular cylindrical basin were derived from Luke's principle. Taking Galerkin's expansion of the velocity potential and the free surface elevation, the second_order perturbation equations were derived by use of expansion of multiple scale. The nonlinear interactions with the second order internal resonance of three free surface_waves were discussed based on the above. The results include:derivation of the couple equations of resonant interactions among three waves and the conservation laws; analysis of the positions of equilibrium points in phase plane; study of the resonant parameters and the non_resonant parameters respectively in all kinds of circumstances; derivation of the stationary solutions of the second_order interaction equations corresponding to different parameters and analysis of the stability property of the solutions; discussion of the effective solutions only in the limited time range. The analysis makes it clear that the energy transformation mode among three waves differs because of the different initial conditions under nontrivial circumstance. The energy may either exchange among three waves periodically or damp or increase in single waves.展开更多
The multiple patterns of internal solitary wave interactions(ISWI)are a complex oceanic phenomenon.Satellite remote sensing techniques indirectly detect these ISWI,but do not provide information on their detailed stru...The multiple patterns of internal solitary wave interactions(ISWI)are a complex oceanic phenomenon.Satellite remote sensing techniques indirectly detect these ISWI,but do not provide information on their detailed structure and dynamics.Recently,the authors considered a three-layer fluid with shear flow and developed a(2+1)Kadomtsev-Petviashvili(KP)model that is capable of describing five types of oceanic ISWI,including O-type,P-type,TO-type,TP-type,and Y-shaped.Deep learning models,particularly physics-informed neural networks(PINN),are widely used in the field of fluids and internal solitary waves.However,the authors find that the amplitude of internal solitary waves is much smaller than the wavelength and the ISWI occur at relatively large spatial scales,and these characteristics lead to an imbalance in the loss function of the PINN model.To solve this problem,the authors introduce two weighted loss function methods,the fixed weighing and the adaptive weighting methods,to improve the PINN model.This successfully simulated the detailed structure and dynamics of ISWI,with simulation results corresponding to the satellite images.In particular,the adaptive weighting method can automatically update the weights of different terms in the loss function and outperforms the fixed weighting method in terms of generalization ability.展开更多
A systematic procedure is proposed for obtaining solutions for soli- tary waves in stratified fluids. The stratification of the fluid is assumed to be expo- nential or linear. Its comparison with existing results for ...A systematic procedure is proposed for obtaining solutions for soli- tary waves in stratified fluids. The stratification of the fluid is assumed to be expo- nential or linear. Its comparison with existing results for an exponentially stratified fluid shows agreement, and it is found that for the odd series of solutions the direc- tion of displacement of the streamlines from their asymptotic levels is reversed when the stratification is changed from exponential to linear. Finally the interaction of solitary waves is considered, and the Korteweg-de Vries equation and the Boussinesq equation are derived. Thus the known solutions of these equations can be rehed upon to provide the answers to the interaction problem.展开更多
The ＂XIV International Symposium on Iron Nutrition and Interactions in Plants＂ （14th ISINIP） will be held in Beijing, China, on 11-15 October 2008. It will be held together with the Annual Meeting of HarvestPlus-C...The ＂XIV International Symposium on Iron Nutrition and Interactions in Plants＂ （14th ISINIP） will be held in Beijing, China, on 11-15 October 2008. It will be held together with the Annual Meeting of HarvestPlus-China. The joint symposium will provide opportunities to scientists from soil sciences, plant nutrition, plant breeding, animal and human nutrition around the world to communicate their new results and experiences in studying iron nutrition of plants, animal and human for a better understanding of the mechanisms of iron from soils, over plants to animals and human beings. The scientific topics of the symposium are as follows：展开更多
This article first presents an overview of the Internationa] Symposium on Lepton-Photon Interactions (LP’95) and briefly introduce Chinese research achievements in the discipline. It highlights the necessity and impo...This article first presents an overview of the Internationa] Symposium on Lepton-Photon Interactions (LP’95) and briefly introduce Chinese research achievements in the discipline. It highlights the necessity and importance of international cooperation in the HEP community of the world.展开更多
Entropy is important in philosophy of science,but some fallacies originate from the misunderstanding entropy increases.The basis of thermodynamics is the statistics and its basic principle of statistical independence....Entropy is important in philosophy of science,but some fallacies originate from the misunderstanding entropy increases.The basis of thermodynamics is the statistics and its basic principle of statistical independence.We proposed possible entropy decrease due to fluctuation magnified and internal interactions in isolated systems,and discuss this possibility of various aspects on science and nature.Further,we derive quantitatively a total formula of entropy change for universal evolution of any natural and social systems,and discuss entropy decrease in economics and social sciences.Entropy change is a testable science.As long as we break through the bondage of the second law of thermodynamics,the rich and complex world is full of examples of entropy decrease.We believe world is not pessimistic always.展开更多
Objectives We are delighted to invite you to join us at the second International Conference on the Material Point Method for Modelling Soil-Water-Structure Interaction organised by the Anura3D MPM Research Community ...Objectives We are delighted to invite you to join us at the second International Conference on the Material Point Method for Modelling Soil-Water-Structure Interaction organised by the Anura3D MPM Research Community （www.Anura3D.com） in January 2019 in Cambridge （MPM2019）. This is the second international conference organised by the Community, following a series of workshops and symposia, sponsored by the FP7 Marie-Curie project MPM-DREDGE, and the success of MPM2017 held in Delft in January 2017.展开更多
Objectives We are delighted to invite you to join us at the second Intemational Conference on the Material Point Method for Modelling Soil-Water-Structure Interaction organised by the Anura3D MPM Research Community （...Objectives We are delighted to invite you to join us at the second Intemational Conference on the Material Point Method for Modelling Soil-Water-Structure Interaction organised by the Anura3D MPM Research Community （www.Anura3D.com） in January 2019 in Cambridge （MPM2019）. This is the second interna- tional conference organised by the Community, following a series of workshops and symposia, sponsored by the FP7 Marie-Curie project MPM-DREDGE, and the success of MPM2017 held in Delft in January 2017.展开更多
8-11 January 2019,Cambridge,UK Objectives We are delighted to invite you to join us at the second International Conference on the Material Point Method for Modelling Soil-Water-Structure Interaction organised by the A...8-11 January 2019,Cambridge,UK Objectives We are delighted to invite you to join us at the second International Conference on the Material Point Method for Modelling Soil-Water-Structure Interaction organised by the Anura3D MPM Research Community（www.Anura3D.com）in January 2019 in Cambridge（MPM2019）.展开更多
Global urbanization is exerting severe stress and having far-reaching impacts on the eco-environment, and yet there exists a complex non-linear coupling relationship between the two. Research on the interactive coupli...Global urbanization is exerting severe stress and having far-reaching impacts on the eco-environment, and yet there exists a complex non-linear coupling relationship between the two. Research on the interactive coupling effect between urbanization and the eco-environment will be a popular area of study and frontier in international earth system science and sustainability science in the next 10 years, while also being a high-priority research topic of particular interest to international organizations. This paper systematically collates and summarizes the international progress made in research on interactive coupling theory, coupling relationships, coupling mechanisms, coupling laws, coupling thresholds, coupling models and coupling optimization decision support systems. The research shows that urbanization and eco-environment interactive coupling theories include the Kuznets curve theory, telecoupling theory, planetary boundaries theory, footprint family theory and urban metabolism theory; most research on interactive coupling relationships is concerned with single- element coupling relationships, such as those between urbanization and water, land, atmosphere, climate change, ecosystems and biodiversity; the majority of research on interactive coupling mechanisms and laws focuses on five research paradigms, including coupled human and nature systems, complex social-ecological systems, urban ecosystems, social-economic-natural complex ecosystems, and urbanization development and eco-environment constraint ring; the majority of interactive coupling simulations use STIRPAT models, coupling degree models, multi-agent system models and big data urban computer models; and research has been carried out on urbanization and eco-environment coupling thresholds, coercing risk and optimal decision support systems. An objective evaluation of progress in international research on interactive coupling between urbanization and the eco-environment suggests that there are six main research focal points and six areas lacking research： a lot of research exists on macroscopic coupling effects, with little research on urban agglomeration and scale coupling effects; considerable research exists on sin-gle-dimension coupling effects, with little on multiple-dimension coupling effects; a great deal exists on ＂one-to-one＂ dual- element coupling effects, with little on ＂many-to-many＂ multiple-element coupling effects; a lot exists on positive feedback coupling effects, and little on negative feedback coupling effects; a great deal exists on empirical coupling effects, and little on theoretical coupling effects; a great deal exists on the use of simple quantitative methods, and little on using integrated simulation methods. Future studies should focus on coupling effects between urbanization in urban agglomerations and the eco-environment, spatial scale coupling effects, multi-dimensional coupling effects, telecoupling effects, ＂one-to-many＂ and ＂many-to-many＂ element coupling effects, and positive and negative feedback coupling effects. There is also a need to strengthen the development and application of dynamic models for multi-element,-scale,-scenario,-module and-agent integrated spatiotemporal coupling systems and further improve theoretical innovations in coupling effect research and integrate and form complete and diverse coupling theoretical systems.展开更多
基金2023 Shanxi College Students’Innovative Entrepreneurial Training Plan Program“Research on Book Translation Project Management Process”(20231864)。
文摘With the increasing trend of globalization and the rapid advancement of information technology,online learning platforms such as Zoom are becoming increasingly influential in the field of education.The focus of this study was the online international peer interaction based on the Zoom platform,detailing how such interaction programs are conducted and exploring in depth the specific impacts of this interaction mode on students’comprehensive competencies,global perspectives,and cross-cultural communication skills.This research not only provides new practical references for online learning and international education but also offers new research perspectives and directions for educators and researchers.
文摘The basic equations of free capillary_gravity surface_waves in a circular cylindrical basin were derived from Luke's principle. Taking Galerkin's expansion of the velocity potential and the free surface elevation, the second_order perturbation equations were derived by use of expansion of multiple scale. The nonlinear interactions with the second order internal resonance of three free surface_waves were discussed based on the above. The results include:derivation of the couple equations of resonant interactions among three waves and the conservation laws; analysis of the positions of equilibrium points in phase plane; study of the resonant parameters and the non_resonant parameters respectively in all kinds of circumstances; derivation of the stationary solutions of the second_order interaction equations corresponding to different parameters and analysis of the stability property of the solutions; discussion of the effective solutions only in the limited time range. The analysis makes it clear that the energy transformation mode among three waves differs because of the different initial conditions under nontrivial circumstance. The energy may either exchange among three waves periodically or damp or increase in single waves.
基金supported by the National Natural Science Foundation of China under Grant Nos.12275085,12235007,and 12175069Science and Technology Commission of Shanghai Municipality under Grant Nos.21JC1402500 and 22DZ2229014.
文摘The multiple patterns of internal solitary wave interactions(ISWI)are a complex oceanic phenomenon.Satellite remote sensing techniques indirectly detect these ISWI,but do not provide information on their detailed structure and dynamics.Recently,the authors considered a three-layer fluid with shear flow and developed a(2+1)Kadomtsev-Petviashvili(KP)model that is capable of describing five types of oceanic ISWI,including O-type,P-type,TO-type,TP-type,and Y-shaped.Deep learning models,particularly physics-informed neural networks(PINN),are widely used in the field of fluids and internal solitary waves.However,the authors find that the amplitude of internal solitary waves is much smaller than the wavelength and the ISWI occur at relatively large spatial scales,and these characteristics lead to an imbalance in the loss function of the PINN model.To solve this problem,the authors introduce two weighted loss function methods,the fixed weighing and the adaptive weighting methods,to improve the PINN model.This successfully simulated the detailed structure and dynamics of ISWI,with simulation results corresponding to the satellite images.In particular,the adaptive weighting method can automatically update the weights of different terms in the loss function and outperforms the fixed weighting method in terms of generalization ability.
文摘A systematic procedure is proposed for obtaining solutions for soli- tary waves in stratified fluids. The stratification of the fluid is assumed to be expo- nential or linear. Its comparison with existing results for an exponentially stratified fluid shows agreement, and it is found that for the odd series of solutions the direc- tion of displacement of the streamlines from their asymptotic levels is reversed when the stratification is changed from exponential to linear. Finally the interaction of solitary waves is considered, and the Korteweg-de Vries equation and the Boussinesq equation are derived. Thus the known solutions of these equations can be rehed upon to provide the answers to the interaction problem.
文摘The ＂XIV International Symposium on Iron Nutrition and Interactions in Plants＂ （14th ISINIP） will be held in Beijing, China, on 11-15 October 2008. It will be held together with the Annual Meeting of HarvestPlus-China. The joint symposium will provide opportunities to scientists from soil sciences, plant nutrition, plant breeding, animal and human nutrition around the world to communicate their new results and experiences in studying iron nutrition of plants, animal and human for a better understanding of the mechanisms of iron from soils, over plants to animals and human beings. The scientific topics of the symposium are as follows：
文摘This article first presents an overview of the Internationa] Symposium on Lepton-Photon Interactions (LP’95) and briefly introduce Chinese research achievements in the discipline. It highlights the necessity and importance of international cooperation in the HEP community of the world.
文摘Entropy is important in philosophy of science,but some fallacies originate from the misunderstanding entropy increases.The basis of thermodynamics is the statistics and its basic principle of statistical independence.We proposed possible entropy decrease due to fluctuation magnified and internal interactions in isolated systems,and discuss this possibility of various aspects on science and nature.Further,we derive quantitatively a total formula of entropy change for universal evolution of any natural and social systems,and discuss entropy decrease in economics and social sciences.Entropy change is a testable science.As long as we break through the bondage of the second law of thermodynamics,the rich and complex world is full of examples of entropy decrease.We believe world is not pessimistic always.
文摘Objectives We are delighted to invite you to join us at the second International Conference on the Material Point Method for Modelling Soil-Water-Structure Interaction organised by the Anura3D MPM Research Community （www.Anura3D.com） in January 2019 in Cambridge （MPM2019）. This is the second international conference organised by the Community, following a series of workshops and symposia, sponsored by the FP7 Marie-Curie project MPM-DREDGE, and the success of MPM2017 held in Delft in January 2017.
文摘Objectives We are delighted to invite you to join us at the second Intemational Conference on the Material Point Method for Modelling Soil-Water-Structure Interaction organised by the Anura3D MPM Research Community （www.Anura3D.com） in January 2019 in Cambridge （MPM2019）. This is the second interna- tional conference organised by the Community, following a series of workshops and symposia, sponsored by the FP7 Marie-Curie project MPM-DREDGE, and the success of MPM2017 held in Delft in January 2017.
文摘8-11 January 2019,Cambridge,UK Objectives We are delighted to invite you to join us at the second International Conference on the Material Point Method for Modelling Soil-Water-Structure Interaction organised by the Anura3D MPM Research Community（www.Anura3D.com）in January 2019 in Cambridge（MPM2019）.
基金Major Program of the National Natural Science Foundation of China,No.41590840,No.41590842
文摘Global urbanization is exerting severe stress and having far-reaching impacts on the eco-environment, and yet there exists a complex non-linear coupling relationship between the two. Research on the interactive coupling effect between urbanization and the eco-environment will be a popular area of study and frontier in international earth system science and sustainability science in the next 10 years, while also being a high-priority research topic of particular interest to international organizations. This paper systematically collates and summarizes the international progress made in research on interactive coupling theory, coupling relationships, coupling mechanisms, coupling laws, coupling thresholds, coupling models and coupling optimization decision support systems. The research shows that urbanization and eco-environment interactive coupling theories include the Kuznets curve theory, telecoupling theory, planetary boundaries theory, footprint family theory and urban metabolism theory; most research on interactive coupling relationships is concerned with single- element coupling relationships, such as those between urbanization and water, land, atmosphere, climate change, ecosystems and biodiversity; the majority of research on interactive coupling mechanisms and laws focuses on five research paradigms, including coupled human and nature systems, complex social-ecological systems, urban ecosystems, social-economic-natural complex ecosystems, and urbanization development and eco-environment constraint ring; the majority of interactive coupling simulations use STIRPAT models, coupling degree models, multi-agent system models and big data urban computer models; and research has been carried out on urbanization and eco-environment coupling thresholds, coercing risk and optimal decision support systems. An objective evaluation of progress in international research on interactive coupling between urbanization and the eco-environment suggests that there are six main research focal points and six areas lacking research： a lot of research exists on macroscopic coupling effects, with little research on urban agglomeration and scale coupling effects; considerable research exists on sin-gle-dimension coupling effects, with little on multiple-dimension coupling effects; a great deal exists on ＂one-to-one＂ dual- element coupling effects, with little on ＂many-to-many＂ multiple-element coupling effects; a lot exists on positive feedback coupling effects, and little on negative feedback coupling effects; a great deal exists on empirical coupling effects, and little on theoretical coupling effects; a great deal exists on the use of simple quantitative methods, and little on using integrated simulation methods. Future studies should focus on coupling effects between urbanization in urban agglomerations and the eco-environment, spatial scale coupling effects, multi-dimensional coupling effects, telecoupling effects, ＂one-to-many＂ and ＂many-to-many＂ element coupling effects, and positive and negative feedback coupling effects. There is also a need to strengthen the development and application of dynamic models for multi-element,-scale,-scenario,-module and-agent integrated spatiotemporal coupling systems and further improve theoretical innovations in coupling effect research and integrate and form complete and diverse coupling theoretical systems.
