OKUMURA GROUP/奥村研究室 > Publications

Publications

Original Papers (refereed)

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  1. Akihiro Ohara and Ko Okumura, Bending of polymer films: a method for obtaining a compressive modulus of thin films, Soft Matter (2024): DOI: 10.1039/d4sm00084f.
  2. Nana Tanaka and Ko Okumura, Viscous friction acting on a solid disk falling in confined fluid: Lessons for the scaling analysis, Phys. Rev. Research L032047 (2023).
  3. Hana Nakazato and Ko Okumura, Air entrained into viscous liquid by a disk: confinement induced suppression of breakup, Phys. Rev. Research 4, 013150 (2022).
  4. Yukina Margaret Koga and Ko Okumura, “Inertial Coalescence of a Liquid Drop Surrounded by Viscous Liquid,” J. Phys. Soc. Jpn. 91, 025001 (2022).
  5. Atsushi Kubo, Naoyuki Sakumichi, Yoshihiro Morishita, Ko Okumura, Katsuhiko Tsunoda, Kenji Urayama, and Yoshitaka Umeno, “Dynamic glass transition dramatically accelerates crack propagation in rubberlike solids,” Phys. Rev. Materials 5, 073608 (2021). PDF
  6. Mika Umehara and Ko Okumura, “How universal is the vibration-velocity controlled granular convection?,” EPJ Web Conf.  2021, 249, 03019 (open access). https://doi.org/10.1051/epjconf/202124903019
  7. Julie André and Ko Okumura, “Capillary replacement in a tube pre-filled with a viscous fluid,” Langmuir 2020, 36, 10952–10959 (open access). https://pubs.acs.org/doi/10.1021/acs.langmuir.0c01612
  8. Hui Zee Then, Teruyo Sekiguchi, and Ko Okumura, “Rising obstacle in a one-layer granular bed induced by continuous  vibrations: Two dynamical regimes governed by vibration velocity,” Soft Matter 16 (2020) 8612 – 8617 (open access). https://doi.org/10.1039/D0SM01021A
  9. Mayuko Murano and Ko Okumura, “Rising bubble in a cell with a high aspect ratio cross-section filled with a viscous fluid and its connection to viscous fingering,” Phys. Rev. Research 2, 013188 (2020). Open Access
  10. Mika Umehara and Ko Okumura, “Rising obstacle in a two-dimensional granular bed induced by continuous and discontinuous vibrations: dynamics governed by vibration velocity,” J. Phys. Soc. Jpn. 89, 035001 (2020). https://doi.org/10.7566/JPSJ.89.035001 (OPEN SELECT)
  11. Midori Isobe and Ko Okumura, Continuity and discontinuity of kirigami’s high-extensibility transition: a statistical-physics viewpoint, Phys. Rev. Research 1, 022001(R)(2019). Open Access
  12. Yuko Aoyanagi and Ko Okumura, Crack propagation under static and dynamic boundary conditions, Polymer 185 (2019) 121648 [9 pages]. PDF https://doi.org/10.1016/j.polymer.2019.121648.
  13. Yuko Aoyanagi and Ko Okumura, Toughening in a nacre-like soft-hard layered structure due to weak nonlinearity in the soft layer, Phys. Rev. Mater. 3 (2019) 053607; https://doi.org/10.1103/PhysRevMaterials.3.053607; PDF; https://arxiv.org/abs/1904.08165
  14. Takako Tomizawa and Ko Okumura, Velocity jump in the crack propagation induced on a semi-crystalline polymer sheet by constant-speed stretching, Polymer 173 (2019) 166-171 PDF;  https://doi.org/10.1016/j.polymer.2019.04.009; http://arxiv.org/abs/1904.03250
  15. Takako Tomizawa and Ko Okumura, Visco- and plasto-elastic fracture of nanoporous polymer sheets, Polymer J. 51, 845–850(2019) ; https://www.nature.com/articles/s41428-019-0198-z; PDF; https://arxiv.org/abs/1903.10680
  16. Midori Isobe and Ko Okumura, Discontinuity in the in-plane to out-of-plane transition of kirigami, J. Phys. Soc. Jpn. 88, 025001 (2019). doi/10.7566/JPSJ.88.025001 (open access) PDF with cover (inside only)
  17. Atsushi Takei and Ko Okumura, Crack Propagation in porous polymer sheets with different pore sizes, MRS Commun. 8, 1477-1482(2018); http://dx.doi.org/10.1557/mrc.2018.222 (open access).
  18. Ko Okumura, Velocity Jumps in Crack Propagation in Elastomers: Relevance of a Recent Model to Experiments, J. Phys. Soc. Jpn. 87, 125003 (2018). Open access
  19. Hana Nakazato, Yuki Yamagishi, and Ko Okumura, Self-similar dynamics of air film entrained by a solid disk in confined space: A simple prototype of topological transitions, Phys. Rev. Fluids 3, 054004 (2018); doi/10.1103/PhysRevFluids.3.054004 (open access); Movie 1; Movie 2; Movie 3; Movie 4
  20. Mayuko Murano and Ko Okumura, Bursting dynamics of viscous film without circular symmetry: the effect of confinement, Phys. Rev. Fluids 3, 031601(R) (2018); Movie 1; Movie 2; Movie 3; doi/10.1103/PhysRevFluids.3.031601 (open access)
  21. Ko Okumura, Viscous dynamics of drops and bubbles in Hele-Shaw cells: drainage, drag friction, coalescence, and bursting, Adv. Colloid Interface Sci. 255,  64-75 (2018); doi/10.1016/j.cis.2017.07.021 (open access)
  22. Ko Okumura, Continuum Mechanics and Its Practical Applications at the Level of Scaling Laws. In R. Narayan (Ed.), Encyclopedia of Biomedical Engineering, vol. 2, pp. 111–118. (Elsevier 2019; Available online 13 September 2018); DOI:10.1016/B978-0-12-801238-3.99927-6
  23. Naoyuki Sakumichi and Ko Okumura, Exactly solvable model for a velocity jump observed in crack propagation in viscoelastic solids, Sci. Rep. 7, 8065 (2017); doi:10.1038/s41598-017-07214-8; free from publisher; direct links: Article; Supplementary Material
  24. Yuko Aoyanagi and Ko Okumura, Stationary crack propagation in a two-dimensional visco-elastic network model, Polymer 120 (2017) 94-99; DOI: 10.1016/j.polymer.2017.05.033 PDF(647kB); preprint
  25. Atsushi Takei, Mayuko Murano, Marie Tani, Hiroyuki Fujita & Ko Okumura, Micro arch-bridge strucutred surface fabricated by kirigami-on-elastomer approach for liquid-dependent iso/anisotropic wetting, Appl. Phys. Lett. 110, 161602 (2017); doi: 10.1063/1.4981255. PDF(1.8MB)
  26. Yuki Yoshimura, Yui Yagisawa, and Ko Okumura, Meandering instability of air flow in a granular bed: self-similarity and fluid-solid duality, Sci. Rep. 6, 38457 (2016); doi:10.1038/srep38457. SI movies (CC BY 4.0): Meander small; Meander large; Turbulent ; Free from publisher
  27. Misato Yahashi, Natsuki Kimoto, and Ko Okumura, Scaling crossover in thin-film drag dynamics of fluid drops in the Hele-Shaw cell, Sci. Rep. 6, 31395 (2016); doi:10.1038/srep31395; Free from publisher
  28. Yui Yagisawa, Hui Zee Then, Ko Okumura, Stationary bubble formation and cavity collapse in wedge-shaped hoppers, Sci. Rep. 6, 25065 (2016); doi: 10.1038/srep25065; SI movies (CC BY 4.0) : Bubbling (1.1 MB) & Cavity (1.8 MB); Free from publisher
  29. Midori Isobe and Ko Okumura, Initial rigid response and softening transition of highly stretchable kirigami sheet materials, Sci. Rep. 6, 24758  (2016); doi: 10.1038/srep24758. SI movie (1.1 MB) (CC BY 4.0);  Free from publisher; Press Release (343 kB)
  30. Ko Okumura, Simple views on different problems in physics: from drag friction to tough biological materials, Phil. Mag. 96, 828-841 (2016); https://doi.org/10.1080/14786435.2015.1095366 (open access); Invited Perspective. PDF(1.5B)
  31. Narumi Takahashi and Ko Okumura, Scaling crossover in crack-tip stresses and a robust scaling law for fracture strength, J. Phys. Soc. Jpn. 84, 114602 (2015). PDF
  32. Marie Tani, Ryuji Kawano, Koki Kamiya, and Ko Okumura, Towards combinatorial mixing devices without any pumps by open-capillary channels: fundamentals and applications, Sci. Rep. 5 (2015) 10263. Free from Publisher
  33. Ko OKUMURA, Strength and toughness of biocomposites consisting of soft and hard elements: A few fundamental models, MRS Bulletin, 40 [04] (2015) 333-339 (invited Review): DOI: http://dx.doi.org/10.1557/mrs.2015.66 (open access); PDF 1.4MB
  34. Ko OKUMURA, Strength and toughness of bio-fusion materials, Polymer J. 47, 99-105 (2015) (Focus Review; February 2015; doi:10.1038/pj.2014.97). PDF 781kB
  35. Marie TANI, Daisuke ISHII, Shuto ITO, Takahiko HARIYAMA, Masatsugu SHIMOMURA, and Ko OKUMURA, Capillary rise on legs of a small animal and on artificially textured surfaces mimicking them, PlosOne 9 (2014) e96813; DOI: 10.1371/journal.pone.0096813. Free from Publisher
  36. Yuki Kashima and Ko Okumura, Fracture of soft foam solids: interplay of visco- and plasto-elasticity, ACS Macro Lett. 3 (2014), 419-422; Free from Publisher
  37. Yuka TAKEHARA and Ko OKUMURA, High-velocity drag friction in granular media near the jamming point, Phys. Rev. Lett. 112 (2014) 148001; DOI: 10.1103/PhysRevLett.112.148001. PDF 372KB
  38. Mayuko MURANO and Ko OKUMURA, Simple Network Model for Reinforcement of Materials with Voids, J. Phys. Soc. Jpn. 83, 035001:1-2, (2014). (PDF 298KB) 10.7566/JPSJ.83.035001
  39. Ko OKUMURA, Simple Model for the Toughness of a Helical Structure Inspired by the Exoskeleton of Lobsters, J. Phys. Soc. Jpn.  82 (2013) 124802 (6 pages); Free from Publisher
  40. Yukari HAMAMOTO and Ko OKUMURA, Realistic numerical analysis of a bioinspired layered composite with a crack: robust scaling laws and crack arrest, Adv. Eng. Mater., 15, 522-528 (2013); DOI: 10.1002/adem.201300061; selected for the front cover and highlighted on the web page.
  41. Noriko OBARA and Ko OKUMURA, Imbibition of a textured surface decorated by short pillars with rounded edges, Phys. Rev. E Rapid Communication, 86, 020601(2012); DOI:10.1103/PhysRevE.86.020601 (PDF)
  42. Noriko OBARA and Ko OKUMURA, Imbibition of surfaces decorated with pillars of submillimeter scales, J. Phys. Soc. Jpn. 81 (2012) SA011.
  43. Maria Yokota and Ko OKUMURA, Coalescence dynamics of a quasi-two dimensional viscous Drop, J. Phys. Soc. Jpn. 81 (2012) SA015.
  44. Naomi SONE, Marie MORI, and Ko OKUMURA, Scaling relation in fracture of the materials with elastoplastic response inaccessible by scaling laws, J. Phys. Soc. Jpn. 81 (2012) 074604 (1-5) PDF inside only 10.1143/JPSJ.81.074604
  45. Ayako ERI and Ko OKUMURA, Viscous drag friction acting on a fluid drop confined in between two plates, Soft Matter, 7, 5648 (2011); highlighted as hot article (May 25, 2011) and made access-free by the publisher. PDF inside only
  46. Maria YOKOTA and Ko OKUMURA, Dimensional crossover in the coalescence dynamics of viscous drops confined in between two plates, Proc. Nat. Acad. Sci. (USA), 108 (2011) 6395–6398. Free from Publisher; featured in In this issue (This week in PNAS), PNAS,  108 (2011) 6337.
  47. Yuka TAKEHARA, Sachika FUJIMOTO and Ko OKUMURA, High velocity drag friction in dense granular media, EPL (Europhys. Lett.), 92, 44003 (2010). PDF inside only
  48. Ayako ERI and Ko OKUMURA, Bursting of a thin film in a confined geometry: Rimless and constant-velocity dewetting, Phys. Rev. E Rapid Communication, 82, 030601 (2010). PDF inside only
  49. Yuko AOYANAGI and Ko OKUMURA, A simple model for the mechanics of spider webs, Phys. Rev. Lett. 104, 038102 (2010). PDF inside only; 10.1103/PhysRevLett.104.038102; Erratum,  Phys. Rev. Lett. 115, 039903 (2015); featured in, Philip Ball, Web designers, Nature Materials 9, 190 (2010). PDF inside only.
  50. Minako HAMAMOTO-KUROSAKI and Ko OKUMURA, On a moving liquid film and its instability on textured surfaces, Eur. Phys. J. E 30, 283–290 (2009) (PDF 267kB inside only).
  51. Yuko AOYANAGI and Ko OKUMURA, Stress and displacement around a crack in layered network systems mimicking nacre, Phys. Rev. E 79 (2009) 066108. (PDF361KB).
  52. Yuko AOYANAGI and Ko OKUMURA, Crack-tip stress concentration and structure size in nonlinear structured materials, J. Phys. Soc. Jpn. 78 (2009) 034402-1–5 (PDF113KB inside only). 10.1143/JPSJ.78.034402
  53. Yukari Hamamoto and Ko Okumura, Analytical studies on a crack in layered structures mimicking nacre, J. Eng. Mech. 135 (2009) 461-467.
  54. Yukari Hamamoto and Ko Okumura, Analytical solution to a fracture problem in a tough layered structure, Phys. Rev. E 78 (2008) 026118-1–5. (PDF112KB inside only)
  55. C. Ishino and K. Okumura, Wetting transitions on textured hydrophilic surfaces, Eur. Phys. J. E 25 (2008) 415-424. (PDF435KB, inside only)
  56. Nao Sato and Ko Okumura, Nematic transitions inside a film on substrates with stripe patterns of graded homeotropic anchoring, Chem. Phys. Lett. 453 (2008) 274–278. PDF 373kB (inside only)
  57. Ayako ERI and Ko OKUMURA, Lifetime of a two-dimensional air bubble, Phys. Rev. E Rapid Communication 76 (2007) 060601. http://link.aps.org/abstract/PRE/v76/e060601 PDF 197kB (inside only)
  58. Nao SATO and Ko OKUMURA, An inversion method based on the Legendre transformation applied to discontinuous phase transitions J. Phys. Soc. Jpn. 76 (2007) 114008-1 — 114008-5. http://jpsj.ipap.jp/link?JPSJ/76/114008/pdf PDF(inside only)
  59. Satoko NAKAGAWA and Ko OKUMURA, Crack-tip stress concentration and mesh size in networks, J. Phys. Soc. Jpn. 76 (2007) 114801-1 — 114801-4. http://jpsj.ipap.jp/link?JPSJ/76/114801 PDF (inside only)
  60. Chieko Ishino, Mathilde Reyssat, Etienne Reyssat, Ko Okumura and David Quere, Wicking in a forest of micro-pillars, Europhys. Lett. 79 (2007) 56005. PDF(247KB)
  61. K. Kawai and K. Okumura, Single molecular statistics of an optically tweezed polymer: a theoretical consideration, Chem. Phys. Lett. 439 (2007) 369–373. PDF(inside only)
  62. K. Kawai and K. Okumura, Correlation in a Gaussian chain with the ends fixed, Eur. Phys. J. E 21 (2006) 223-230. PDF(inside only 350KB)
  63. Y. Shiina, Y. Hamamoto and K. Okumura, Fracture of soft cellular solids – case of non-crosslinked polyethylene foam, Europhys. Lett. 76 (2006) 588-594. PDF(358KB)
  64. C. Ishino and K. Okumura, Nucleation scenarios for wetting transition on textured surfaces: the effect of contact angle hysteresis, Europhys. Lett. 76 (2006) 464-470. PDF(197KB)
  65. K. Okumura, Fracture strength of biomimetic composites: scaling views on nacre, J. Phys.: Condens. Matter 17 (2005) S2879-S2884. PDF(inside only 130KB)
  66. C. Ishino, K. Okumura and D. Quéré, Wetting transitions on rough surfaces, Europhys. Lett. 68 (2004) 419-425. PDF(233KB)
  67. K. Okumura, Toughness of double elastic networks, Europhys. Lett. 67 (2004) 470-476. PDF(123KB)
  68. K. Okumura, and Y. Tanimura, Energy-level diagrams and their contribution to fifth-order Raman and second-order infrared responses: Distinction between relaxation mechanisms by two-dimensional spectroscopy, J. Phys. Chem. A 107 (2003) 8092-8105 (A. C. Albrecht Memorial issue, invited and refereed).
  69. K. Okumura, Enhanced energy of parallel fractures in nacre-like composite materials, Europhys. Lett. 63 (2003) 701-707. PDF(127KB)
  70. P.-G. de Gennes and K. Okumura, Phase transition of nematic rubbers, Europhys. Lett. 63 (2003) 76-82. PDF(135KB)
  71. Y. Tanaka, Y. Yamazaki, and K. Okumura, Bouncing gel balls: Impact of soft gels onto rigid surface, Europhys. Lett. 63 (2003) 149-155. PDF(150KB)
  72. K. Okumura, C. Clanet, D. Richard, and D. Quéré, Water spring: a model for bouncing drops, Europhys. Lett. 62 (2003) 237-243. PDF(143KB)
  73. Ko Okumura, Why is nacre strong? II. Remaining mechanical weakness for cracks propagating along the sheets, Eur. Phys. J. E 7 (2002) 303-310. PDF(192KB)
  74. K. Okumura, D. M. Jonas, and Y. Tanimura, Two-dimensional spectroscopy and the harmonically coupled anharmonic oscillators, Chem. Phys. 266 (2001) 237-250 (invited and refereed) (PDF inside only 270KB).
  75. Ko Okumura and Pierre-Gilles de Gennes, Why is nacre strong? : Elastic theory and fracture mechanics for biocomposites with stratified structures, Eur. Phys. J. E 4 (2001) 121-127. PDF(191KB)
  76. P. G. de Gennes, K. Okumura, M. Shahinpoor, and K. J. Kim, Mechanoelectric effects in ionic gels, Europhys. Lett. 50 (2000) 513-518. PDF(inside only 1410KB)
  77. Pierre-Gilles de Gennes and Ko Okumura, On the toughness of biocomposites, C. R. Acad. Sci. Paris, t. 1, Série IV (2000) 257-261.
  78. K. Okumura, B. Bagchi, and Y. Tanimura, Cage dynamics in the third-order off-resonant response of liquid molecules: A theoretical realization, Bull. Chem. Soc. Jpn., 73 (2000) 873-884.
  79. K. Okumura, A. Tokmakoff, and Y. Tanimura, Two-dimensional line shape analysis of photon echo signal, Chem. Phys. Lett. 314 (1999) 488-495.
  80. K. Okumura, A. Tokmakoff, and Y. Tanimura, Structural information from two-dimensional fifth-order Raman spectroscopy, J. Chem. Phys. 111 (1999) 492-503.
  81. K. Okumura and Y. Tanimura, Two-dimensional THz spectroscopy of liquids: Nonlinear vibrational response to a series of THz laser pulses, Chem. Phys. Lett. 295 (1998) 298–304.
  82. M. Cho, K. Okumura, and Y. Tanimura, Coherent two-dimensional Raman scattering: Frequency-domain measurements of the intra- and intermolecular vibrational interactions, J. Chem. Phys. 108 (1998) 1326-1334.
  83. K. Okumura, A reformulation of simple liquids theory — Renormalization by one-, two-, and three-particle densities, J. Math. Phys. 39 (1998) 2077-2102.(PDF, inside)
  84. K. Okumura and Y. Tanimura, Sensitivity of two-dimensional fifth-order Raman response to the mechanism of vibrational mode-mode coupling in liquid molecules, Chem. Phys. Lett. 278 (1997) 175-183.
  85. K. Okumura and Y. Tanimura, Interplay of inhomogeneity and anharmonicity in 2D Raman spectroscopy of liquids, Chem. Phys. Lett. 277 (1997) 159-166.
  86. K. Okumura and Y. Tanimura, Two-time correlation functions of a harmonic system non-bilinearly coupled to a heat bath: Spontaneous Raman spectroscopy, Phys. Rev. E56 (1997) 2747-2750.
  87. Y. Tanimura and K. Okumura, First-, third-, and fifth-order resonant spectroscopy of an anharmonic displaced oscillators system in the condensed phase, J. Chem. Phys. 106 (1997) 2078-2095.
  88. K. Okumura and Y. Tanimura, The (2n+1)th-order off-resonant spectroscopy from the (n+1)th-order anharmonicities of molecular vibrational modes in the condensed phase, J. Chem. Phys. 106 (1997)  1687-1698.(PDF, inside)
  89. K. Okumura and Y. Tanimura, Femtosecond two-dimensional spectroscopy from anharmonic vibrational modes of molecules in the condensed phase, J. Chem. Phys. 107 (1997) 2267-2283. (PDF, inside)
  90. K. Okumura and Y. Tanimura, Unified time-path approach to the effect of anharmonicity on the molecular vibrational spectroscopy in solution, J. Chem. Phys. 105 (1996) 7294-7309.
  91. K. Okumura and Y. Tanimura, Unified time-path approach to the generating functional of the Brownian oscillator system: the bilinearly corrected Feynman rule for nonequilibrium processes, Phys. Rev. E53 (1996) 214-227. (PDF, inside)
  92. K. Okumura, Effective actions of local composite operators: the case of φ4  theory, the itinerant electron model and QED, Int. J. Mod. Phys. A11 (1996) 65-109. (PDF, inside)
  93. K. Okumura, A systematic analysis of the ferromagnetism in the itinerant electron model, J. Magn. Magn. Mat. 140-144 (1995) 191-192.
  94. R. Fukuda, M. Komachiya, S. Yokojima, Y. Suzuki, K. Okumura, and T. Inagaki, Novel use of Legendre transformation in field theory and many particle systems: On-shell expansion and inversion method, Prog. Theor. Phys. Suppl. 121 (1995) 1-428 (PDF 35.4MB inside only).
  95. K. Okumura, Systematic analysis of the magnetic susceptibility in the itinerant electron model, Phys. Rev. B52 (1995) 13358-13367.
  96. K. Okumura, Field-theoretical approach to Hubbard-like Hamiltonians (Doctoral Thesis, Keio University, 1994).
  97. K. Okumura, The supergroup U(M/N) with regard to electronic Hamiltonians, J. Phys. Soc. Jpn. 62 (1993) 1922-1926.
  98. K. Okumura, Various condensed matter Hamiltonians in terms of U(2/2) operators and their symmetry structures, Mod. Phys. Lett. B7 (1993) 251-258.
  99. K. Okumura and R. Fukuda, Nonadiabatic response theory: the case of volume change, Phys. Rev. E47 (1993) 1486-1498. PDF
  100. K. Okumura, Derivation of the 4-body bound-state equation from the effective action — Diagrammatical Legendre transformation, Prog. Theor. Phys. 87 (1992) 703-725 (PDF .1.03MB inside only)

Proceedings (refereed)

M Natsuisaka, K Tsujii, M Shimomura, H Yabu, Y Hirai, T Mashiko, S Deguchi, S Mukai, Y Inoue, Y Nishiyama, M Sawada, K Okumura and K Sakamoto, Microgravity experiments in the field of physical chemistry in Japan, 2011 J. Phys.: Conf. Ser. 327 012046. http://iopscience.iop.org/1742-6596/327/1/012046

Okumura, “Scaling views on strength of soft/hard composites,” in III European Conference on Computational Mechanics – Solids, Structures and Coupled Problems in Engineering: Book of Abstracts, ed. by C. A. Mota Soares, J. A. C. Martins, H. C. Rodrigues, J. A. C. Ambrosio, C. A. B. Pina, C. M. Mota Soares, E. B. R. Pereira, and J. Folgado (Springer, Dordrecht, Netherlands, 2006, ISBN-10 1-4020-4994-3) p.597.(full version in CD).

Ko Okumura, “Scaling Views on Toughness of Composite Materials,” in Computational Mechanics, ed. By Z. H. Yao, M. W. Yuan and W. X. Zhong (Tsinghua Univ. Press & Springer, Beijing, 2004, ISBN 7-302-09341-5) 306-306 (full version in CD: ISBN 7-89494-512-9).

Ko Okumura, Toughness and Fracture of gel composites, e-polymers (www.e-polymers.org, 2005)
http://www.e-polymers.org/paris/data/L1977.pdf

Ko Okumura and Pierre-Gilles de Gennes, “Phase transitions of nematic rubbers,” in Slow Dynamics in Complex Systems, ed. by Tokuyama (American Institute of Physics, New York, 2004, ISBN 0-7354-0183-7) 414-417;AIP Conf. Proc. 708, 414 (2004).

Ko Okumura, Yoshitaka Tanimura, and Andrei Tokmakoff, “Information in the two-dimensional fifth-order Raman spectroscopy — Anharmonicity, Nonlinearity, Mode coupling, and Molecular Structure —,“ in Two-dimensional Correlation Spectroscopy, ed. by Y. Ozaki (American Institute of Physics, New York, 2000, ISBN 1-56396-916-5) 321-324; AIP Conf. Proc. 503, 321 (2000).

Proceedings

Maria Yokota and Ko Okumura, Dimensional crossover in the viscous dynamics of coalescence of liquid drops confined in between two plates, Bull. Am. Phys. Soc. 56 (2011) 394.

Yuka Takehara and Ko Okumura, High-velocity drag friction in dense granular media, Bull. Am. Phys. Soc. 56 (2011) 29.

Ko Okumura , Ayako Eri, and Maria Yokota, Dynamics of bubbles and drops in a Hele-Shaw cell, Bull. Am. Phys. Soc. 54 (2009) 115.

Yumiko Yoshitake and Ko Okumura, On the origin of contact angle hysteresis, Bull. Am. Phys. Soc. 54 (2009) 222.

Mathilde Reyssat, Chieko Ishino , Etienne Reyssat , Ko Okumura , David Quere, Wicking within forests of micro-pillars, Bull. Am. Phys. Soc. 52 (2007) JP.00011.

K. Okumura and Y. Tanimura, Two dimensional spectroscopy of Liquids in THz-domain: THz analogue of 2D Raman spectroscopy, Bull. Am. Phys. Soc. 43 (1998) 758.

K. Okumura and Y. Tanimura, Fifth- and higher-order off-resonant spectroscopy from anharmonic vibrational modes of molecules in the condensed phase, Bull. Am. Phys. Soc. 43 (1997) 231.

K. Okumura and Y. Tanimura, Unified Time Path Approach to the Effect of Anharmonicity on the Molecular Vibrational Spectroscopy in Liquid, Bull. Am. Phys. Soc. 41 (1996) 511.

K. Okumura, A systematic analysis of the ferromagnetism in the itinerant electron model, in International Conference on Magnetism 1994 (Osrodek Wydawnictw Naukowych, Warsaw, 1994, ISBN 83-85481-16-8) 728.

Other publications

Okumura, My memories of Pierre-Gilles de Gennes, Tackling Global Issues vol.1 Soft Matter: Material of the Future
Global Relations Office, Institute for International Collaboration, Hokkaido University Published in March 2018 PDF
https://issuu.com/hokkaidouniversity-gro/docs/soft_matter-material_of_the_future/50
REM: At the beginning of the second page, the following phrases are erroneously dropped: “disappear. The faxes I sent him could be very long, often up to 10 pages. In contrast, his faxes were very”