In this paper, we describe the performance and accuracy of the P2M2 tree code. The P2M2 tree code is a highaccuracy tree code based on the pseudoparticle multipole method (P2M2). P2M2 is a method to express multipole expansion using a small number of pseudoparticles. The potential field of physical particles is approximated by the field generated by the pseudoparticles. The primary advantage of...

1) National Institute of Agrobiological Sciences (NIAS), 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602, Japan 2) Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Morioka, Iwate 020-8550, Japan 3) Institute of Agricultural and Forest Engineering, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8572, Japan 4) Present address: Eugentech, Korea Research Institute of Bioscience & Bio...

Characterization of chemical reactions by initial complexes: 1,2-addition reactions to Si=C and Si=Si bonds Masae Takahashi,∗1 Tamás Veszprémi,∗2 Kenkichi Sakamoto,∗1,∗3 and Mitsuo Kira∗3 ∗1Laboratory for Organometallic Photodynamics, RIKEN Photodynamics Research Center ∗2Department of Inorganic Chemistry, Technical University of Budapest, Hungary ∗3Department of Chemistry, Graduate School of S...

The present study involves a novel computational technique, regarding simultaneous use of the pseudo particle method, Poisson integral method and a special-purpose computer originally designed for molecular dynamics simulations (MDGRAPE-3). In the present calculations, the dynamics of two colliding vortex rings have been studied using the vortex method. The present acceleration technique allows...

1 Technology and development unit for knowledge base of mouse phenotype, RIKEN Bioresource center, 3-1-1 Kouyadai, Tsukuba, Ibaraki 305-0074, Japan 2 Bioinformatics and systems engineering division, RIKEN Yokohama Institute, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama City, Kanagawa, 230-0045, Japan 3 Department of Knowledge Systems, The Institute of Scientific and Industrial Research (ISIR), Osak...

Statistical characteristics of two-dimensional point vortex systems in positive and negative temperature states are examined by massive numerical simulations using a special-purpose supercomputer, MDGRAPE-3. Mathematical description of the system is identical to that of a collection of charged rods, i.e., a guiding-center plasma. The characteristics of the negative temperature state is examined...

Dynamics of two-sign point vortices in two-dimensional circular boundary is examined by numerical simulations with MDGRAPE-2. The vortex system is characterized by the inverse temperature beta as determined from the density of states of the microcanonical ensemble of numerically generated 10(7) states. The massive simulation shows that different configurations appear in the time-asymptotic stat...

Shuai Dong,1,2 Qinfang Zhang,3,4,5 Seiji Yunoki,4,5,6 J.-M. Liu,2,7 and Elbio Dagotto8,9 1Department of Physics, Southeast University, Nanjing 211189, China 2National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China 3Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of technology, Yancheng 224051, China...