A newnumerical method based on vector form intrinsic finite element（VFIFE） is proposed to simulate the integral lifting process of steel structures. First, in order to verify the validity of the VFIFE method, taking...A newnumerical method based on vector form intrinsic finite element（VFIFE） is proposed to simulate the integral lifting process of steel structures. First, in order to verify the validity of the VFIFE method, taking the steel gallery between the integrated building and the attached building of Nanjing M obile Communication Buildings for example, the static analysis was carried out and the corresponding results were compared with the results achieved by the traditional finite element method. Then, according to the characteristics of dynamic construction of steel structure integral lifting, the tension cable element was employed to simulate the behavior of dynamic construction. The VFIFE method avoids the iterative solution of the stiffness matrix and the singularity problems. Therefore, it is simple to simulate the complete process of steel structure lifting construction.Finally, by using the VFIFE, the displacement and internal force time history curves of the steel structures under different lifting speeds are obtained. The results show that the lifting speed has influence on the lifting force, the internal force, and the displacement of the structure. In the case of normal lifting speed, the dynamic magnification factor of 1. 5 is safe and reasonable for practical application.展开更多
In this paper, we consider a reaction diffusion system with Hamitonian structure, we first prove the existence of an invariant region for system and the continuity of the semigroup, then establish the absorbing sets ...In this paper, we consider a reaction diffusion system with Hamitonian structure, we first prove the existence of an invariant region for system and the continuity of the semigroup, then establish the absorbing sets and global attractor.展开更多
In this paper, we investigate a class of mixed initial-boundary value problems for a kind of n × n quasilinear hyperbolic systems of conservation laws on the quarter plan. We show that the structure of the pieeew...In this paper, we investigate a class of mixed initial-boundary value problems for a kind of n × n quasilinear hyperbolic systems of conservation laws on the quarter plan. We show that the structure of the pieeewise C^1 solution u = u（t, x） of the problem, which can be regarded as a perturbation of the corresponding Riemann problem, is globally similar to that of the solution u = U（x/t） of the corresponding Riemann problem. The piecewise C^1 solution u = u（t, x） to this kind of problems is globally structure-stable if and only if it contains only non-degenerate shocks and contact discontinuities, but no rarefaction waves and other weak discontinuities.展开更多
The relationship between forms and forces is one of the main topics of structural morphology. This harmonious coexisting link is very strong for systems in tensegrity state, commonly called ＂tensegrity systems＂. It ...The relationship between forms and forces is one of the main topics of structural morphology. This harmonious coexisting link is very strong for systems in tensegrity state, commonly called ＂tensegrity systems＂. It is currently apparent that, among the tensegrity systems, there also exist cable-bar cells with a discontinuous network of cables. It is possible to design a separate set of cables inside the cable-bar elementary cell and to establish a self-stress state of equilibrium. In this connection, the author of this paper suggested to assume a new Class-Theta tensegrity systems. Each of the basic tensegrity systems termed Class-Theta possesses an external and internal set of tension components. The shape of Greek capital letter 69 （Theta） reflects two sets of such components （two sets of tendons, cables, etc.）. This notation corresponds to Skelton＇s Class-k tensegrity structure. As shown in this paper, the Class-Theta tensegrity cell can exemplify a geometrically and practically useful form for the lightweight and long-span modular structures, mainly but not only in view of civil engineering and architecture.展开更多
This paper analyzes the role of nuclear power of China's energy structure and industry system. Comparing with other renewable energy the nuclear power chain has very low greenhouse gas emission, so it will play mo...This paper analyzes the role of nuclear power of China's energy structure and industry system. Comparing with other renewable energy the nuclear power chain has very low greenhouse gas emission, so it will play more important role in China's low-carbon economy. The paper also discussed the necessity of nuclear power development to achieve emission reduction, energy structure adjustment, nuclear power safety,environmental protection, enhancement of nuclear power technology, nuclear waste treatment, and disposal, as well as nuclear power plant decommissioning. Based on the safety record and situation of the existing power plants in China, the current status of the development of world nuclear power technology, and the features of the independently designed advanced power plants in China, this paper aims to demonstrate the safety of nuclear power. A nuclear power plant will not cause harm either to the environment and nor to the public according to the real data of radioactivity release, which are obtained from an operational nuclear plant. The development of nuclear power technology can enhance the safety of nuclear power. Further, this paper discusses issues related to the nuclear fuel cycle, the treatment, and disposal strategies of nuclear waste, and the decommissioning of a nuclear power plant, all of which are issues of public concern.展开更多
This article deals with one of the theoretical dilemmas of contemporary sociology： the dualism of the individualistic and holistic approaches. One of the most famous attempts to overcome this dualism is the structura...This article deals with one of the theoretical dilemmas of contemporary sociology： the dualism of the individualistic and holistic approaches. One of the most famous attempts to overcome this dualism is the structuration theory of Anthony Giddens, and alongside this is found the conception of social realism of Roy Bhaskar and Margaret Archer. Their efforts to link individualistic and holistic approaches are based on a varifocal attempt to explain the theoretical issues from both individualistic and holistic perspectives. The author of this article believes that there is an alternative solution to this problem, where both perspectives are ＂blended＂ in a theoretical explanation demonstrating that the concepts which we use in sociological theory--actor, action and structure--are inherently of dualistic nature, i.e., they are ＂duplex＂.展开更多
Our studies about safety in society lead us to the most popular book by Karl Mannheim： Ideology and Utopia. This work envisages the discrepancies between social knowledge and the material world itself. The crucial co...Our studies about safety in society lead us to the most popular book by Karl Mannheim： Ideology and Utopia. This work envisages the discrepancies between social knowledge and the material world itself. The crucial conclusion reads as follows： Our image of reality is mostly based on our interests and desires and does not rely on thorough research. There are two types of such representations： utopia and ideology. The first of them, less interesting for us, is the type of ideas which can revolutionize a social being. The second one is a particular set of visions which can never be realized but on the other hand they act as common knowledge （general knowledge of the world）--stabilizing the social structure by presenting it with a holistic image of the world. Taking the above into consideration, how is it possible that representations, being so distant from reality （creating a completely separate ＂world＂）, basically enable efficient functioning in it？ Ideology, being the foundation of the society＇s functioning space, should always be tautological, in the sense that for the participants of the given world＇s image （creation as it is）, it should define the being in a comprehensive and adequate way （in Thomas Aquinas spirit）. What is more, it would always be true. We should also mention that the main tools of ideology, understood this way, are specific definitions and the extrapolation of sense. The purpose of this lecture is to prove that it is possible for ideology to come to life, only when the individuals who acknowledge it will consider their image of reality proper. The above ideological system should be understood as the obviousness of description of the surrounding world which in return makes unreflective functioning in reality possible. This obviousness of the presented world will be referred to as social safety.展开更多
Supply-side structural reforms are structural adjustments and institutional reforms to address the mismatch between supply and demand and improve TFP. The mismatch is exhibited at the supply side and arises from struc...Supply-side structural reforms are structural adjustments and institutional reforms to address the mismatch between supply and demand and improve TFP. The mismatch is exhibited at the supply side and arises from structural contradictions and must be addressed through reforms. Supply-side structural reforms can be analyzed at the levels of firms, industries and government to arrive at theoretical and systematic conclusions that offer practical guidance. Based on this perspective, this paper proposes policy recommendations on how to deal with zombie firms, reduce cost for manufacturing companies, deepen SOE reforms, eliminate overcapacity, implement ＂Made in China 2025＂ and Internet＋ strategies, promote Beijing-l^anjin-Hebei integrated development, as well as develop the Yangtze River Economic Belt and the old industrial bases of the northeast.展开更多
As the investment structure of economic structure has a direct impact on the industrial structure, economic structure and thus become the focus of research. However, due to the impact of the traditional planned econom...As the investment structure of economic structure has a direct impact on the industrial structure, economic structure and thus become the focus of research. However, due to the impact of the traditional planned economy system, for a long time, our focus on the expansion of investment scale, optimize investment structure and neglect, leading to low efficiency of investment, private investment is difficult to effectively start, optimizing economic structure adjustment difficulties and other problems. The paper has got a conclusion that the target of optimization of real estate investment and ways based on the status of investment of real estate, and integration analysis for real estate investment sources.展开更多
This article presents in detail the assembling and welding process technique of the steel box girder tuyere blocks of Taizhou Bridge. The application of this process technique effectively solves the problem of welding...This article presents in detail the assembling and welding process technique of the steel box girder tuyere blocks of Taizhou Bridge. The application of this process technique effectively solves the problem of welding stress release in tuyere block assembling and welding without increasing the number of turns of the blocks and overhead welding, thus avoiding possible structural deformation due to excessive accumulation of internal welding stress, greatly reducing the repeated deformation and correction work during assembling and welding, and ensuring the weld seam quality and overall dimensions of tuvere blocks of Taizhou Bridze.展开更多
基金The National Natural Science Foundation of China(No.51308105)
文摘A newnumerical method based on vector form intrinsic finite element（VFIFE） is proposed to simulate the integral lifting process of steel structures. First, in order to verify the validity of the VFIFE method, taking the steel gallery between the integrated building and the attached building of Nanjing M obile Communication Buildings for example, the static analysis was carried out and the corresponding results were compared with the results achieved by the traditional finite element method. Then, according to the characteristics of dynamic construction of steel structure integral lifting, the tension cable element was employed to simulate the behavior of dynamic construction. The VFIFE method avoids the iterative solution of the stiffness matrix and the singularity problems. Therefore, it is simple to simulate the complete process of steel structure lifting construction.Finally, by using the VFIFE, the displacement and internal force time history curves of the steel structures under different lifting speeds are obtained. The results show that the lifting speed has influence on the lifting force, the internal force, and the displacement of the structure. In the case of normal lifting speed, the dynamic magnification factor of 1. 5 is safe and reasonable for practical application.
文摘In this paper, we consider a reaction diffusion system with Hamitonian structure, we first prove the existence of an invariant region for system and the continuity of the semigroup, then establish the absorbing sets and global attractor.
基金supported by the National Natural Science Foundation of China under Grant No.10671124
文摘In this paper, we investigate a class of mixed initial-boundary value problems for a kind of n × n quasilinear hyperbolic systems of conservation laws on the quarter plan. We show that the structure of the pieeewise C^1 solution u = u（t, x） of the problem, which can be regarded as a perturbation of the corresponding Riemann problem, is globally similar to that of the solution u = U（x/t） of the corresponding Riemann problem. The piecewise C^1 solution u = u（t, x） to this kind of problems is globally structure-stable if and only if it contains only non-degenerate shocks and contact discontinuities, but no rarefaction waves and other weak discontinuities.
文摘The relationship between forms and forces is one of the main topics of structural morphology. This harmonious coexisting link is very strong for systems in tensegrity state, commonly called ＂tensegrity systems＂. It is currently apparent that, among the tensegrity systems, there also exist cable-bar cells with a discontinuous network of cables. It is possible to design a separate set of cables inside the cable-bar elementary cell and to establish a self-stress state of equilibrium. In this connection, the author of this paper suggested to assume a new Class-Theta tensegrity systems. Each of the basic tensegrity systems termed Class-Theta possesses an external and internal set of tension components. The shape of Greek capital letter 69 （Theta） reflects two sets of such components （two sets of tendons, cables, etc.）. This notation corresponds to Skelton＇s Class-k tensegrity structure. As shown in this paper, the Class-Theta tensegrity cell can exemplify a geometrically and practically useful form for the lightweight and long-span modular structures, mainly but not only in view of civil engineering and architecture.
文摘This paper analyzes the role of nuclear power of China's energy structure and industry system. Comparing with other renewable energy the nuclear power chain has very low greenhouse gas emission, so it will play more important role in China's low-carbon economy. The paper also discussed the necessity of nuclear power development to achieve emission reduction, energy structure adjustment, nuclear power safety,environmental protection, enhancement of nuclear power technology, nuclear waste treatment, and disposal, as well as nuclear power plant decommissioning. Based on the safety record and situation of the existing power plants in China, the current status of the development of world nuclear power technology, and the features of the independently designed advanced power plants in China, this paper aims to demonstrate the safety of nuclear power. A nuclear power plant will not cause harm either to the environment and nor to the public according to the real data of radioactivity release, which are obtained from an operational nuclear plant. The development of nuclear power technology can enhance the safety of nuclear power. Further, this paper discusses issues related to the nuclear fuel cycle, the treatment, and disposal strategies of nuclear waste, and the decommissioning of a nuclear power plant, all of which are issues of public concern.
文摘This article deals with one of the theoretical dilemmas of contemporary sociology： the dualism of the individualistic and holistic approaches. One of the most famous attempts to overcome this dualism is the structuration theory of Anthony Giddens, and alongside this is found the conception of social realism of Roy Bhaskar and Margaret Archer. Their efforts to link individualistic and holistic approaches are based on a varifocal attempt to explain the theoretical issues from both individualistic and holistic perspectives. The author of this article believes that there is an alternative solution to this problem, where both perspectives are ＂blended＂ in a theoretical explanation demonstrating that the concepts which we use in sociological theory--actor, action and structure--are inherently of dualistic nature, i.e., they are ＂duplex＂.
文摘Our studies about safety in society lead us to the most popular book by Karl Mannheim： Ideology and Utopia. This work envisages the discrepancies between social knowledge and the material world itself. The crucial conclusion reads as follows： Our image of reality is mostly based on our interests and desires and does not rely on thorough research. There are two types of such representations： utopia and ideology. The first of them, less interesting for us, is the type of ideas which can revolutionize a social being. The second one is a particular set of visions which can never be realized but on the other hand they act as common knowledge （general knowledge of the world）--stabilizing the social structure by presenting it with a holistic image of the world. Taking the above into consideration, how is it possible that representations, being so distant from reality （creating a completely separate ＂world＂）, basically enable efficient functioning in it？ Ideology, being the foundation of the society＇s functioning space, should always be tautological, in the sense that for the participants of the given world＇s image （creation as it is）, it should define the being in a comprehensive and adequate way （in Thomas Aquinas spirit）. What is more, it would always be true. We should also mention that the main tools of ideology, understood this way, are specific definitions and the extrapolation of sense. The purpose of this lecture is to prove that it is possible for ideology to come to life, only when the individuals who acknowledge it will consider their image of reality proper. The above ideological system should be understood as the obviousness of description of the surrounding world which in return makes unreflective functioning in reality possible. This obviousness of the presented world will be referred to as social safety.
文摘Supply-side structural reforms are structural adjustments and institutional reforms to address the mismatch between supply and demand and improve TFP. The mismatch is exhibited at the supply side and arises from structural contradictions and must be addressed through reforms. Supply-side structural reforms can be analyzed at the levels of firms, industries and government to arrive at theoretical and systematic conclusions that offer practical guidance. Based on this perspective, this paper proposes policy recommendations on how to deal with zombie firms, reduce cost for manufacturing companies, deepen SOE reforms, eliminate overcapacity, implement ＂Made in China 2025＂ and Internet＋ strategies, promote Beijing-l^anjin-Hebei integrated development, as well as develop the Yangtze River Economic Belt and the old industrial bases of the northeast.
文摘As the investment structure of economic structure has a direct impact on the industrial structure, economic structure and thus become the focus of research. However, due to the impact of the traditional planned economy system, for a long time, our focus on the expansion of investment scale, optimize investment structure and neglect, leading to low efficiency of investment, private investment is difficult to effectively start, optimizing economic structure adjustment difficulties and other problems. The paper has got a conclusion that the target of optimization of real estate investment and ways based on the status of investment of real estate, and integration analysis for real estate investment sources.
文摘This article presents in detail the assembling and welding process technique of the steel box girder tuyere blocks of Taizhou Bridge. The application of this process technique effectively solves the problem of welding stress release in tuyere block assembling and welding without increasing the number of turns of the blocks and overhead welding, thus avoiding possible structural deformation due to excessive accumulation of internal welding stress, greatly reducing the repeated deformation and correction work during assembling and welding, and ensuring the weld seam quality and overall dimensions of tuvere blocks of Taizhou Bridze.
