Numerical simulation on the flow fields near the dimpled and the smooth revolution bodies are performed and compared by using SST k-ω turbulence model, to explain the reasons of friction and base drag reductions on t...Numerical simulation on the flow fields near the dimpled and the smooth revolution bodies are performed and compared by using SST k-ω turbulence model, to explain the reasons of friction and base drag reductions on the bionic dimpled surface and the control behaviors of dimpled surface to boundary layer near wall of the revolution body. The simulation results show that the dimpled surface reduces the skin friction drag through reducing the velocity gradient and turbulent intensity, and reduces the base drag through weakening the pumping action on the flow behind the revolution body caused by the external flow; the low speed rotating vortexes in the dimples segregate the external flow and the revolution body; and the low speed rotating vortexes forming in the bottom of dimples can produce negative skin friction.展开更多
Based on the discovery of the SSW stress field of the Earth and Mars, the authors proposed that each of the celestial bodies in the Solar System possesses a consistent stress field along the revolution axis relative t...Based on the discovery of the SSW stress field of the Earth and Mars, the authors proposed that each of the celestial bodies in the Solar System possesses a consistent stress field along the revolution axis relative to their own obliquity of the ecliptic ( ε ).This paper describes a deep going study on the control role of the stress field on the formation of the Tibet plateau.1\ Discovery of the stress filed along the revolution axis of the Earth and Mars (1)Discovery of the four tridimensional tectonic systems in the global SSW stress field [1] :In West China, under the action of this stress field, the alternative WNW\|trending belts of fault uplifts and fault depressions intersect the alternative belts of ENE\|trending sinistral and NNW\|trending dextral conjugate shear\|compressive uplifts and depressions,and then combine with the NNE\|trending tensile fault belt, to form the “uplift on uplift" ,the “third\|order overlapped uplift" ,the“depression in depression” ,the “third\|order sunk depression", and also the composite fault uplifts and fault depressions composed of four or more fault groups. They are produced simultaneously and form the rivers, lakes, basins, mountains and plateaus and show the mirror symmetry in section. This tectonic framework can be observed not only in the Qinghai—Tibet plateau but also in all over China and even on the entire Earth. Therefore, the SSW principal compressive stress is the unified global stress field and its model has already been constructed [1] .展开更多
Revolutions,typical cases of crucial social transformations,cannot be realized successfully without a large number of activists.Therefore,creating conditions favorable for acquiring enough participants should be an im...Revolutions,typical cases of crucial social transformations,cannot be realized successfully without a large number of activists.Therefore,creating conditions favorable for acquiring enough participants should be an important topic of Marxist social science.In particular,this problem includes the “free-ride,” because the benefits of revolutionaries’ activities are gained not only by the activists but also by all other members.The paper analyzes problems such as this one,applying non-cooperative game theory to social dilemma problems.This leads to some interesting results.In this research,the problem of the workers’ choice between unity or freeride is first defined using numerical examples of the gain structure.It is defined again in a more generalized form using other parameters.In so doing,we express both the cost of participating in the movement and the gains from the concession of the ruling class.Because this analysis focuses on the importance of the number of participants,the concession of the ruling class is framed as a function of the number of participants.The results of this analysis revealed that the economic base and superstructure accurately correspond in some game structures but not in others.In other words,the social dilemma presents either as a case of prisoners’ dilemma or as a chicken game.Furthermore,this paper analyzes the influence of group size,and it was revealed that groups with a large number of members,such as a ruled class,find it particularly difficult to unite.This phenomenon is called the “large group dilemma.” In these ways,this research shows that the aforementioned type of game theory can be used to analyze the difficulties and possibilities of social movements.展开更多
Well-preserved Cretaceous lacustrine deposits in Songliao Basin NE China provide a unique oppor- tunity both for building the terrestrial type stage of Cretaceous in China and for studying the response of Cretaceous m...Well-preserved Cretaceous lacustrine deposits in Songliao Basin NE China provide a unique oppor- tunity both for building the terrestrial type stage of Cretaceous in China and for studying the response of Cretaceous major global geological events.The basin had undergone three stages of tectonic evolution during the Late Jurassic and Cretaceous:syn-rifting phase,post-rifting thermal subsidence phase and basin inversion phase.The shallow strata of Yaojia Formation contain excellent Putaohua and Sartu reservoir rocks,which contribute great to the giant展开更多
In order to simulate metamaterial rotational symmetric open region problems,unconditionally stable perfectly match layer(PML)implementation is proposed in the body of revolution(BOR)finite-difference time-domain(FDTD)...In order to simulate metamaterial rotational symmetric open region problems,unconditionally stable perfectly match layer(PML)implementation is proposed in the body of revolution(BOR)finite-difference time-domain(FDTD)lattice.More precisely,the proposed algorithm is implemented by the Crank-Nicolson(CN)Douglas-Gunn(DG)procedure for BOR metamaterial simulation.The constitutive relationship of metamaterial can be expressed by the Drude model and calculated by the piecewise linear recursive convolution(PLRC)approach.The effectiveness including absorption,efficiency,and accuracy is demonstrated through the numerical example.It can be concluded that the proposed implementation is to take the advantages of the CNDG-PML procedure,PLRC approach,and BORFDTD algorithm in terms of considerable accuracy,enhanced absorption and remarkable efficiency.Meanwhile,it can be demonstrated that the proposed scheme can maintain its unconditional stability when the time step exceeds the CourantFriedrichs-Levy(CFL)condition.展开更多
Well-preserved Cretaceous lacustrine deposits in Songliao Basin NE China provide a unique opportunity both for building the terrestrial type stage of Cretaceous in China and for studying the response of Cretaceous maj...Well-preserved Cretaceous lacustrine deposits in Songliao Basin NE China provide a unique opportunity both for building the terrestrial type stage of Cretaceous in China and for studying the response of Cretaceous major global geological events.The basin had been undergone three stages of tectonic evolution during展开更多
In multi-agent systems(MAS),finding agents which are able to service properly in an open and dynamic environment are the key issue in problem solving.However,it is difficult to find agent resources quickly and positio...In multi-agent systems(MAS),finding agents which are able to service properly in an open and dynamic environment are the key issue in problem solving.However,it is difficult to find agent resources quickly and position agents accurately and complete the system integration by the keyword matching method,due to the lack of clear semantic information of the classical agent model.An semantic-based agent dynamic positioning mechanism was proposed to assist in the system dynamic integration.According to the semantic agent model and the description method,a two-stage process including the domain positioning stage and the service semantic matching positioning stage,was discussed.With this mechanism,proper agents that provide appropriate service to assign sub-tasks for task completion can be found quickly and accurately.Finally,the effectiveness of the positioning mechanism was validated through the in-depth performance analysis in the application of simulation experiments to the system dynamic integration.展开更多
基金Sponsored by the National Natural Science Foundation of China (50635030)the Technology Development Plan of Jilin Province ( 20096032)+1 种基金the Major Program of Science and Technology Development of Jilin Province (09ZDGG001)the Youth Research Start-up Fund of Agriculture Department of Jilin University ( 4305050102K7)
文摘Numerical simulation on the flow fields near the dimpled and the smooth revolution bodies are performed and compared by using SST k-ω turbulence model, to explain the reasons of friction and base drag reductions on the bionic dimpled surface and the control behaviors of dimpled surface to boundary layer near wall of the revolution body. The simulation results show that the dimpled surface reduces the skin friction drag through reducing the velocity gradient and turbulent intensity, and reduces the base drag through weakening the pumping action on the flow behind the revolution body caused by the external flow; the low speed rotating vortexes in the dimples segregate the external flow and the revolution body; and the low speed rotating vortexes forming in the bottom of dimples can produce negative skin friction.
文摘Based on the discovery of the SSW stress field of the Earth and Mars, the authors proposed that each of the celestial bodies in the Solar System possesses a consistent stress field along the revolution axis relative to their own obliquity of the ecliptic ( ε ).This paper describes a deep going study on the control role of the stress field on the formation of the Tibet plateau.1\ Discovery of the stress filed along the revolution axis of the Earth and Mars (1)Discovery of the four tridimensional tectonic systems in the global SSW stress field [1] :In West China, under the action of this stress field, the alternative WNW\|trending belts of fault uplifts and fault depressions intersect the alternative belts of ENE\|trending sinistral and NNW\|trending dextral conjugate shear\|compressive uplifts and depressions,and then combine with the NNE\|trending tensile fault belt, to form the “uplift on uplift" ,the “third\|order overlapped uplift" ,the“depression in depression” ,the “third\|order sunk depression", and also the composite fault uplifts and fault depressions composed of four or more fault groups. They are produced simultaneously and form the rivers, lakes, basins, mountains and plateaus and show the mirror symmetry in section. This tectonic framework can be observed not only in the Qinghai—Tibet plateau but also in all over China and even on the entire Earth. Therefore, the SSW principal compressive stress is the unified global stress field and its model has already been constructed [1] .
文摘Revolutions,typical cases of crucial social transformations,cannot be realized successfully without a large number of activists.Therefore,creating conditions favorable for acquiring enough participants should be an important topic of Marxist social science.In particular,this problem includes the “free-ride,” because the benefits of revolutionaries’ activities are gained not only by the activists but also by all other members.The paper analyzes problems such as this one,applying non-cooperative game theory to social dilemma problems.This leads to some interesting results.In this research,the problem of the workers’ choice between unity or freeride is first defined using numerical examples of the gain structure.It is defined again in a more generalized form using other parameters.In so doing,we express both the cost of participating in the movement and the gains from the concession of the ruling class.Because this analysis focuses on the importance of the number of participants,the concession of the ruling class is framed as a function of the number of participants.The results of this analysis revealed that the economic base and superstructure accurately correspond in some game structures but not in others.In other words,the social dilemma presents either as a case of prisoners’ dilemma or as a chicken game.Furthermore,this paper analyzes the influence of group size,and it was revealed that groups with a large number of members,such as a ruled class,find it particularly difficult to unite.This phenomenon is called the “large group dilemma.” In these ways,this research shows that the aforementioned type of game theory can be used to analyze the difficulties and possibilities of social movements.
文摘Well-preserved Cretaceous lacustrine deposits in Songliao Basin NE China provide a unique oppor- tunity both for building the terrestrial type stage of Cretaceous in China and for studying the response of Cretaceous major global geological events.The basin had undergone three stages of tectonic evolution during the Late Jurassic and Cretaceous:syn-rifting phase,post-rifting thermal subsidence phase and basin inversion phase.The shallow strata of Yaojia Formation contain excellent Putaohua and Sartu reservoir rocks,which contribute great to the giant
基金supported by the National Key Laboratory of Science and Technology on Space Microwave(6142411032201)the National Key Research and Development Program of China(2020YFB1807400)+2 种基金the National Natural Science Foundation of China(6157102261971022)the National Key Laboratory Foundation of China(61424020305)。
文摘In order to simulate metamaterial rotational symmetric open region problems,unconditionally stable perfectly match layer(PML)implementation is proposed in the body of revolution(BOR)finite-difference time-domain(FDTD)lattice.More precisely,the proposed algorithm is implemented by the Crank-Nicolson(CN)Douglas-Gunn(DG)procedure for BOR metamaterial simulation.The constitutive relationship of metamaterial can be expressed by the Drude model and calculated by the piecewise linear recursive convolution(PLRC)approach.The effectiveness including absorption,efficiency,and accuracy is demonstrated through the numerical example.It can be concluded that the proposed implementation is to take the advantages of the CNDG-PML procedure,PLRC approach,and BORFDTD algorithm in terms of considerable accuracy,enhanced absorption and remarkable efficiency.Meanwhile,it can be demonstrated that the proposed scheme can maintain its unconditional stability when the time step exceeds the CourantFriedrichs-Levy(CFL)condition.
文摘Well-preserved Cretaceous lacustrine deposits in Songliao Basin NE China provide a unique opportunity both for building the terrestrial type stage of Cretaceous in China and for studying the response of Cretaceous major global geological events.The basin had been undergone three stages of tectonic evolution during
基金Projects(61173026,61373045,61202039)supported by the National Natural Science Foundation of ChinaProject(2012AA02A603)supported by the National High Technology Research and Development Program of China+1 种基金Projects(K5051223008,K5051223002)supported by the Fundamental Research Funds for the Central Universities of ChinaProject(513***103E)supported by the Pre-Research Project of the"Twelfth Five-Year-Plan"of China
文摘In multi-agent systems(MAS),finding agents which are able to service properly in an open and dynamic environment are the key issue in problem solving.However,it is difficult to find agent resources quickly and position agents accurately and complete the system integration by the keyword matching method,due to the lack of clear semantic information of the classical agent model.An semantic-based agent dynamic positioning mechanism was proposed to assist in the system dynamic integration.According to the semantic agent model and the description method,a two-stage process including the domain positioning stage and the service semantic matching positioning stage,was discussed.With this mechanism,proper agents that provide appropriate service to assign sub-tasks for task completion can be found quickly and accurately.Finally,the effectiveness of the positioning mechanism was validated through the in-depth performance analysis in the application of simulation experiments to the system dynamic integration.
