应用A nsoft公司的一种新型电力电子仿真软件S im p lorer,分别对DC-DC开关电源Bosst功率校正电路和DC-AC有源箝位谐振直流环逆变器(ACRL I)电路进行了分析和仿真。在分析Boost功率校正电路时,考虑到功率校正问题,采用了电流滞环控制和...应用A nsoft公司的一种新型电力电子仿真软件S im p lorer,分别对DC-DC开关电源Bosst功率校正电路和DC-AC有源箝位谐振直流环逆变器(ACRL I)电路进行了分析和仿真。在分析Boost功率校正电路时,考虑到功率校正问题,采用了电流滞环控制和P I调节,取得好的效果;对ACRL I逆变电路的工作过程进行了详细地分析,深入地研究了其工作原理,对谐振直流环的控制采用了S im p lorer所具有的状态图控制,仿真结果显示达到了预期的效果。展开更多
In the past two decades,dynamic covalent chemistry has been greatly developed,which is mainly reflected in two aspects:1.new dynamic covalent bonds(DCBs)are continuously discovered;2.various DCBs have been introduced ...In the past two decades,dynamic covalent chemistry has been greatly developed,which is mainly reflected in two aspects:1.new dynamic covalent bonds(DCBs)are continuously discovered;2.various DCBs have been introduced into polymer materials for different functions.These functional polymer materials have brought new opportunities for sustainable development.In this review,we provide an overview of various functions endowed by DCBs in polymer materials,including self-healing,chemical recycling,and shape controlling.Particularly,we pay much attention to the three-dimensional(3D)shape reconfiguration/programming,surface patterning,and reversible actuation.In addition,we also give the current issues,challenges,and opportunities on DCBs-containing materials and point out its developing directions in the future.展开更多
In this paper, we investigate the spatiotemporal dynamics of a reactio^diffusion epi- demic model with zero-flux boundary conditions. The value of our study lies in two aspects： mathematically, by using maximum princ...In this paper, we investigate the spatiotemporal dynamics of a reactio^diffusion epi- demic model with zero-flux boundary conditions. The value of our study lies in two aspects： mathematically, by using maximum principle and the linearized stability theory, a priori estimates of the steady state system and the local asymptotic stability of positive constant solution are given. By using the implicit function theorem, the exis- tence and nonexistence of nonconstant positive steady states are shown. Applying the bifurcation theory, the global bifurcation structure of nonconstant positive steady states is established. Epidemiologically, through numerical simulations, under the conditions of the existence of nonconstant positive steady states, we find that the smaller the space, the easier the pattern formation; the bigger the diffusion, the easier the pattern formation. These results are beneficial to disease control, that is, we must do our best to control the diffusion of the infectious to avoid disease outbreak.展开更多
文摘应用A nsoft公司的一种新型电力电子仿真软件S im p lorer,分别对DC-DC开关电源Bosst功率校正电路和DC-AC有源箝位谐振直流环逆变器(ACRL I)电路进行了分析和仿真。在分析Boost功率校正电路时,考虑到功率校正问题,采用了电流滞环控制和P I调节,取得好的效果;对ACRL I逆变电路的工作过程进行了详细地分析,深入地研究了其工作原理,对谐振直流环的控制采用了S im p lorer所具有的状态图控制,仿真结果显示达到了预期的效果。
基金financially supported by the National Natural Science Foundation of China(21734006)the Foundation for Innovative Research Group of the National Natural Science Foundation of China(21821001)。
文摘In the past two decades,dynamic covalent chemistry has been greatly developed,which is mainly reflected in two aspects:1.new dynamic covalent bonds(DCBs)are continuously discovered;2.various DCBs have been introduced into polymer materials for different functions.These functional polymer materials have brought new opportunities for sustainable development.In this review,we provide an overview of various functions endowed by DCBs in polymer materials,including self-healing,chemical recycling,and shape controlling.Particularly,we pay much attention to the three-dimensional(3D)shape reconfiguration/programming,surface patterning,and reversible actuation.In addition,we also give the current issues,challenges,and opportunities on DCBs-containing materials and point out its developing directions in the future.
文摘In this paper, we investigate the spatiotemporal dynamics of a reactio^diffusion epi- demic model with zero-flux boundary conditions. The value of our study lies in two aspects： mathematically, by using maximum principle and the linearized stability theory, a priori estimates of the steady state system and the local asymptotic stability of positive constant solution are given. By using the implicit function theorem, the exis- tence and nonexistence of nonconstant positive steady states are shown. Applying the bifurcation theory, the global bifurcation structure of nonconstant positive steady states is established. Epidemiologically, through numerical simulations, under the conditions of the existence of nonconstant positive steady states, we find that the smaller the space, the easier the pattern formation; the bigger the diffusion, the easier the pattern formation. These results are beneficial to disease control, that is, we must do our best to control the diffusion of the infectious to avoid disease outbreak.
