Ibaraki University's
Graduate School of Science and Engineering (Science)
Department of Science (Mathematics and Informatics Course)

Associate Professor



  1. postdoctoral fellow, Center for Chaos & Turbulence (CATS), Niels Bohr Insititute (NBI), University of Copenhagen 1995/09-1997/08
  2. postdoctoral fellow, Institute for Mathematics & its Applications (IMA), University of Minnesota 1997/09-1998/06
  3. Associate Professor, Mathematical Sciences, Ibaraki University 1998/07-Present

Academic background

  1. The University of Tokyo Faculty of Engineering Marine Engineering 1988 Graduated
  2. Massachusetts Institute of Technology Department of Mathematics Applied Mathematics Doctor course 1995 Completed USA
  3. The University of Tokyo Graduate School, Division of Engineering Marine Engineering Master course 1991 Completed
  4. University of Illinois, Urbana-Champaign Department of Mathematics Applied Mathematics Master course 1990 Completed USA

Academic degrees

  1. Ph.D. (applied mathematics) Massachusetts Institute of Technology

Research Areas

  1. Foundations of mathematics/Applied mathematics

Research keywords

  1. applied mathematics, mathematical modelling, asymptotic & perturbative analysis, variational methods, numerical compuations, nonlinear phenomena, dissipative systems, viscous flows, eddies, coupled oscillators, bifurcation, chaos, synchronization and clusters

Subject of research

  1. Construction of a reduced model for flows with eddies
  2. Bifurcation of solutions to a contrained minimization problem


  1. Research paper (scientific journal) Joint Burgers equation with no-flux boundary conditions and its application for complete fluid separation Shinya Watanabe, Sohei Matsumoto, Tomohiro Higurashi, Naoki Ono Physica D Elsevier 331, 1-12 2016/05/27 10.1016/j.physd.2016.05.004
  2. Research paper (research society, symposium materials, etc.) Joint A microfluidic device with a large-scale network structure for high-performance fluid separation Sohei Matsumoto, Shinya Watanabe, Tomohiro Higurashi, Naoki Ono 第 7 回マイクロ・ナノ工学シンポジウム講演論文集 日本機械学会 2015/ 7, 29pm3-PN-27 2015/10/29 10.1299/jsmemnm.2015.7._29pm3-PN-_13 A micro fluidic device to realize the new fluid separation method, in which both high concentration and high yield can be achieved by constructing a network of numerous limited-performance separator elements, was designed and fabricated for the purpose of proof of concept. A hexagonal separator unit driven by potential gradient was proposed, enabling simultaneous fabrication of the large number of separator units and their connection required to obtain the desired concentration profile. A prototype device consisting of 36×360 separator units was fabricated by MEMS technology with silicon and glass substrates. A thermophoretic separation experiment using fluorescent polymer beads/water dispersion was successfully performed by the developed device.
  3. Research paper (scientific journal) Joint Almost Complete Separation of a Fluid Component from a Mixture Using Burgers Networks of Microseparators Shinya Watanabe, Sohei Matsumoto, Tomohiro Higurashi, Yuya Yoshikawa, Naoki Ono J. Phys. Soc. Jpn. 84/ 4, 043401 2015/03/17 10.7566/JPSJ.84.043401
  4. Research paper (scientific journal) Only A constrained variational model for radial symmetry breaking Shinya Watanabe Mathematical Journal of Ibaraki University 45, 15-31 2013/10/01 1343-3636 10.5036/mjiu.45.15
  5. Research paper (scientific journal) Joint Model for polygonal hydraulic jumps Erik A. Martens, Shinya Watanabe, and Tomas Bohr Physical Review E 85/ 3, 036316 2012/03/30 10.1103/PhysRevE.85.036316

Research presentations

  1. Poster presentation Almost complete separation of a fluid component from mixture using the Burgers' networks of micro-separators ICMMA 2015 'Self-Organization Modeling and Analysis' 2015/10/28
  2. Oral presentation(general) 微小素子のBurgersネットワーク化による混合流体のほぼ完全な分離 日本応用数理学会2015年 年会 2015/09/10
  3. Oral presentation(general) Almost complete separation of a fluid component from mixture using the Burgers networks of micro-separators ICIAM 2015 (8th International Congress on Industrial and Applied Mathematics) 2015/08/13
  4. Oral presentation(general) 微小素子のBurgersネットワーク化による混合流体のほぼ完全な分離 RIMS研究集会『力学系とその諸分野への応用』 2015/07/01
  5. Poster presentation Almost Complete Separation of a Fluid Component from a Mixture Using the Burgers Networks of Micro-separators SIAM Conference on Applications of Dynamical Systems 2015/05/20

Intellectual property rights

  1. Patent 素子配列、素子、流体の成分分離方法、および素子配列の製造方法 特願2014-255463 2014/12/17 特開2016-112534 2016/06/23 6555567号 2019/07/19

Memberships of academic societies

  1. The Japan Society for Industrial and Applied Mathematics 2013/04/01-Present
  2. SIAM (Society for Industrial & Applied Mathematics) 1995/06-Present