International Collaboration for Promoting Complexity Science

我们与日本、美国、欧洲和亚洲的科学家合作，研究了丰富多样的非平衡开放系统中复杂现象的细节。我们的合作研究总结如下。(1)从MHD模拟中发现，MHD发电机过程在旋转球壳中自发产生具有全局有序结构的强磁场，其极性在长时间后突然反转。(2)我们研究了两个碰撞球点的合并过程，发现在这个过程中形成了一个具有高压的场反转构型。(3)采用粒子模拟的方法研究了无碰撞驱动重联的物理过程。需要强调的是，由于两种动力学效应和静电场作用下离子的异常加热，磁重联分两个步骤进行。(4)粒子模拟表明，如果开放系统中存在熵排出过程，则在正常离子声双层产生和消失后，会产生一个具有大电位差的超级离子声双层。(5)开发了粉尘颗粒动态带电过程的粒子模拟程序，明确了粉尘颗粒发生凝聚的条件。(6)我们通过对聚合物链进行分子动力学模拟，在分子水平上研究了结构的形成过程。强调聚合物链的结构形成分几个步骤进行。(7)我们开发了三维交互式数据可视化系统“complexope”，这是虚拟现实系统的新应用，是理解复杂现象的有力工具。

We have investigated the details of complex phenomena in rich variety of non-equilibrium open systems in collaboration with scientists In Japan, U.S.A., Europe and Asia. The summary of our collaboration research is described in the following.(1) We found from the MHD simulation that a strong magnetic field with a global and ordered structure is spontaneously generated by the MHD dynamo process in a rotating spherica1 shell, and its polarity is suddenly reversed after a long duration.(2) We have studied the merging process of two col1iding spheromaks, and found that a field-reversed configuration with a high pressure is formed through this process.(3) We have studied the physical process of collisionless driven reconnection by means of particle simulation. It should be emphasized that magnetic reconnection evolves in two steps due to two kinetic effects and the ions anomalously heated by the action of an electrostatic field.(4) Particle simulation has revealed that a super ion-acoustic double layr with a large potential gap is generated after the generation and disappearance of a norma1 ion-acoustic double layr if there exists an entropy expulsion process in an open system.(5) We have developed a particle simulation code for dust grains with dynamically charging processes, and clarified the condition under which the coagulation of dust grains takes place.(6) We have investigated the structure formation process at a molecular level by carrying out a molecular dynamics simulation of polymer chains . It is emphasized that the structure formation of polymer chains proceeds in a few steps.(7) We have developed three-dimensiona1 interactive data visualizing system "CompleXcope", which is a new application of the virtual reality system, as a powerful tool to comprehend complex phenomena.