Microwave remote sensing has become the primary means for sea-ice research, and has been supported by a great deal of field experiments and theoretical studies regarding sea-ice microwave scattering. However, these st...Microwave remote sensing has become the primary means for sea-ice research, and has been supported by a great deal of field experiments and theoretical studies regarding sea-ice microwave scattering. However, these studies have been barely carried in the Bohai Sea. The sea-ice microwave scattering mechanism was first developed for the thin sea ice with slight roughness in the Bohai Sea in the winter of 2012, and included the backscattering coefficients which were measured on the different conditions of three bands（L, C and X）, two polarizations（HH and VV）, and incident angles of 20° to 60°, using a ground-based scatterometer and the synchronous physical parameters of the sea-ice temperature, density, thickness, salinity, and so on. The theoretical model of the sea-ice electromagnetic scattering is obtained based on these physical parameters. The research regarding the sea-ice microwave scattering mechanism is carried out through two means, which includes the comparison between the field microwave scattering data and the simulation results of the theoretical model, as well as the feature analysis of the four components of the sea-ice electromagnetic scattering. It is revealed that the sea-ice microwave scattering data and the theoretical simulation results vary in the same trend with the incident angles. Also, there is a visible variant in the sensitivity of every component to the different bands.For example, the C and X bands are sensitive to the top surface, the X band is sensitive to the scatterers, and the L and C bands are sensitive to the bottom surface, and so on. It is suggested that the features of the sea-ice surfaces and scatterers can be retrieved by the further research in the future. This experiment can provide an experimental and theoretical foundation for research regarding the sea-ice microwave scattering characteristics in the Bohai Sea.展开更多
In this paper, a high-order finite-volume scheme is presented for the one- dimensional scalar and inviscid Euler conservation laws. The Simpson＇s quadrature rule is used to achieve high-order accuracy in time. To get...In this paper, a high-order finite-volume scheme is presented for the one- dimensional scalar and inviscid Euler conservation laws. The Simpson＇s quadrature rule is used to achieve high-order accuracy in time. To get the point value of the Simpson＇s quadrature, the characteristic theory is used to obtain the positions of the grid points at each sub-time stage along the characteristic curves, and the third-order and fifth-order central weighted essentially non-oscillatory （CWENO） reconstruction is adopted to estimate the cell point values. Several standard one-dimensional examples are used to verify the high-order accuracy, convergence and capability of capturing shock.展开更多
In this paper,the author recounts his forty-year plus struggle to find a sound basis for understanding the computational fluid dynamics of compressible flow.
This paper analyzes a class of first order partial differential equations with delay (a model for the blood production system). The asymptotic behavior of solutions are studied.
This paper is a brief and selective survey on classification of Hardy Submodules over the polydisk. The survey reports some progress in classification of Hardy submodules
As an experienced translator and theorist, GAO Jian has translated numerous English works into Chinese and published a series of theoretical thoughts concerning the most fundamental problems in translation studies. He...As an experienced translator and theorist, GAO Jian has translated numerous English works into Chinese and published a series of theoretical thoughts concerning the most fundamental problems in translation studies. He has formed a unique style in translation and proposed some theoretical concepts with great expertise. Gao represents the translators' spirit of the time. His theories are highly comprehensive and pragmatic. His discussion of translatability of style, relativity and the Language Characteristics Theory reflect the academic thinking among translators in China, which inspires many young translators and theorists.展开更多
Marx and engels’ great ideology contains rich thought on human rights. Based on the class structure and social development in their lifetimes, the two founders of Marxism profoundly revealed the essence of human righ...Marx and engels’ great ideology contains rich thought on human rights. Based on the class structure and social development in their lifetimes, the two founders of Marxism profoundly revealed the essence of human rights. They revealed the historical process, class essence and hypocrisy of the bourgeois human rights, and expounded the important principle that human rights are always subject to economic and social development. The Marxist of human rights theory emphasizes that even in a capitalist society, the proletariat should not abandon its efforts to strive for human rights, and that the proletariat should use human rights well to improve their survival and development conditions as well as the advancement of the society as a whole. In the localization process of Marxism in China, the Marxist view on human rights has been further developed and innovated in China, and the socialist human rights theory with Chinese characteristics has been formed, which is used to guide the development of China’s human rights cause.展开更多
This investigation focused on the influence of the radial inertia effect on the propagation behavior of stress waves in thin-walled tubes subjected to combined longitudinal and torsional impact loads.Generalized chara...This investigation focused on the influence of the radial inertia effect on the propagation behavior of stress waves in thin-walled tubes subjected to combined longitudinal and torsional impact loads.Generalized characteristics theory was used to analyze the main features of the characteristic wave speeds and simple wave solutions in thin-walled tubes.The incremental elastic-plastic constitutive relations described by the rate-independent plasticity were adopted,and the finite difference method was used to investigate the evolution and propagation behaviors of combined elasticplastic stress waves in thin-walled tubes when the radial inertial effect was considered.The numerical results were compared with those obtained when the radial inertia effect was not considered.The results showed that the speed of the coupled stress wave increased when the radial inertia effect was considered.The hardening modulus of the material in the plastic stage had a greater impact on the coupled slow waves than on the coupled fast waves.展开更多
基金The National Science Foundation for Young Scientists of China under contract No.41306193the National Special Research Fund for Non-Profit Marine Sector under of China under contract No.201105016the European Space Agency-Ministry of Science and Technology of the People’s Republic of China(ESA-MOST)Dragon 3 Cooperation Programme under contract No.10501
文摘Microwave remote sensing has become the primary means for sea-ice research, and has been supported by a great deal of field experiments and theoretical studies regarding sea-ice microwave scattering. However, these studies have been barely carried in the Bohai Sea. The sea-ice microwave scattering mechanism was first developed for the thin sea ice with slight roughness in the Bohai Sea in the winter of 2012, and included the backscattering coefficients which were measured on the different conditions of three bands（L, C and X）, two polarizations（HH and VV）, and incident angles of 20° to 60°, using a ground-based scatterometer and the synchronous physical parameters of the sea-ice temperature, density, thickness, salinity, and so on. The theoretical model of the sea-ice electromagnetic scattering is obtained based on these physical parameters. The research regarding the sea-ice microwave scattering mechanism is carried out through two means, which includes the comparison between the field microwave scattering data and the simulation results of the theoretical model, as well as the feature analysis of the four components of the sea-ice electromagnetic scattering. It is revealed that the sea-ice microwave scattering data and the theoretical simulation results vary in the same trend with the incident angles. Also, there is a visible variant in the sensitivity of every component to the different bands.For example, the C and X bands are sensitive to the top surface, the X band is sensitive to the scatterers, and the L and C bands are sensitive to the bottom surface, and so on. It is suggested that the features of the sea-ice surfaces and scatterers can be retrieved by the further research in the future. This experiment can provide an experimental and theoretical foundation for research regarding the sea-ice microwave scattering characteristics in the Bohai Sea.
基金supported by the National Natural Science Foundation of China (No. 10771134)
文摘In this paper, a high-order finite-volume scheme is presented for the one- dimensional scalar and inviscid Euler conservation laws. The Simpson＇s quadrature rule is used to achieve high-order accuracy in time. To get the point value of the Simpson＇s quadrature, the characteristic theory is used to obtain the positions of the grid points at each sub-time stage along the characteristic curves, and the third-order and fifth-order central weighted essentially non-oscillatory （CWENO） reconstruction is adopted to estimate the cell point values. Several standard one-dimensional examples are used to verify the high-order accuracy, convergence and capability of capturing shock.
文摘In this paper,the author recounts his forty-year plus struggle to find a sound basis for understanding the computational fluid dynamics of compressible flow.
文摘This paper analyzes a class of first order partial differential equations with delay (a model for the blood production system). The asymptotic behavior of solutions are studied.
文摘This paper is a brief and selective survey on classification of Hardy Submodules over the polydisk. The survey reports some progress in classification of Hardy submodules
文摘As an experienced translator and theorist, GAO Jian has translated numerous English works into Chinese and published a series of theoretical thoughts concerning the most fundamental problems in translation studies. He has formed a unique style in translation and proposed some theoretical concepts with great expertise. Gao represents the translators' spirit of the time. His theories are highly comprehensive and pragmatic. His discussion of translatability of style, relativity and the Language Characteristics Theory reflect the academic thinking among translators in China, which inspires many young translators and theorists.
文摘Marx and engels’ great ideology contains rich thought on human rights. Based on the class structure and social development in their lifetimes, the two founders of Marxism profoundly revealed the essence of human rights. They revealed the historical process, class essence and hypocrisy of the bourgeois human rights, and expounded the important principle that human rights are always subject to economic and social development. The Marxist of human rights theory emphasizes that even in a capitalist society, the proletariat should not abandon its efforts to strive for human rights, and that the proletariat should use human rights well to improve their survival and development conditions as well as the advancement of the society as a whole. In the localization process of Marxism in China, the Marxist view on human rights has been further developed and innovated in China, and the socialist human rights theory with Chinese characteristics has been formed, which is used to guide the development of China’s human rights cause.
文摘This investigation focused on the influence of the radial inertia effect on the propagation behavior of stress waves in thin-walled tubes subjected to combined longitudinal and torsional impact loads.Generalized characteristics theory was used to analyze the main features of the characteristic wave speeds and simple wave solutions in thin-walled tubes.The incremental elastic-plastic constitutive relations described by the rate-independent plasticity were adopted,and the finite difference method was used to investigate the evolution and propagation behaviors of combined elasticplastic stress waves in thin-walled tubes when the radial inertial effect was considered.The numerical results were compared with those obtained when the radial inertia effect was not considered.The results showed that the speed of the coupled stress wave increased when the radial inertia effect was considered.The hardening modulus of the material in the plastic stage had a greater impact on the coupled slow waves than on the coupled fast waves.
