• Oktober 2011, Pembicara, 4th International Conference on Nanoscience and Technology (ICNST), Singapore, Singapore
  • April 2006, Pembicara, Material Research Society Conference, San Fransisco, USA
  • Agustus 2005, Pembicara, 21th International Conference on Amorphous and Nanocrystalline Semiconductors, Lisbon, Portugal
  • Oktober 2004, Pembicara, Indonesia-Japan Joint Scientific Symposium, Chiba, Japan
  • September 2004, Pembicara, 8th International Conference in Polycrystalline Semiconductor, Potsdam, Germany
  • Juli 2004, Pembicara, Thin Films Technology 2004, Singapore
  • April 2004, Pembicara, Material Research Society Conference, San Fransisco, USA
  • Januari 2004, Pembicara, 14th International Photovoltaic Science and Engineering Conference, Bangkok. Thailand
  • Desember 2003, Pembicara, International Conference on Materials for Advanced Technologies II, Singapore
  • Agustus 2003, Pembicara, 20th International Conference on Amorphous and Microcrystalline Semiconductors, Sao Paolo, Brazil.
  • Juli 2002, Pembicara, 8th International Conference New Diamond Science and Technology, Melbourne, Australia.
  • Juni 2002, Pembicara, European Material Research Society Conference, Strasbourg, France.
  • April 2002, Pembicara, Material Research Society Conference, San Fransisco, USA
  • Agustus 2001, Pembicara, 19th International Conference on Amorphous and Microcrystalline Semiconductors, Nice, France.
  • Juli 2001, Pembicara, International Conference on Materials for Advanced Technologies, Singapore.
  • April 2001, Peserta, Seminar Kelautan DFG, Purwokerto, Indonesia
  • November 2000, Pembicara, International Symposium on The Science of Surfaces and Nanostructures, Singapore.
  • Agustus 2000, Pembicara, 8th Asia Pasific Physics Conference, Taipei, ROC.
  • April 2000, Peserta, Simposium Fisika Nasional, Serpong, Indonesia
  • Desember 1998, Pembicara, AAPPS Seminar on Physics of Materials, Yogyakarta Indonesia
  • Desember 1998, Pembicara, Simposium Fisika Nasional 18, Yogyakarta, Indonesia
  • 1998, Pembicara, Pertemuan Ilmiah Sains Materi, Serpong, Indonesia
  • 1997, Pembicara, Pertemuan Ilmiah Sains Materi, Serpong, Indonesia
  • 1997, Peserta, Simposium Fisika Jakarta, Jakarta, Indonesia
  • Juni 1997, Pengajar, The Short Course on Solid State Physics, Universitas Bengkulu, Bengkulu, Indonesia
  • Mei 1996, Pengajar, The Short Course on Solid State Physics, Universitas Lampung, Lampung, Indonesia
  • Mei 1996, Pengajar, The Short Course on Solid State Physics, Universitas Riau, Pekanbaru, Indonesia
  • Mei 1996, Pengajar, The Short Course on Solid State Physics, Universitas Syiah Kuala, Banda Aceh, Indonesia
  • April 1996, Pengajar, The Short Course on Solid State Physics, Universitas Sumatera Utara, Medan, Indonesia
  • September 1995, Pembicara, 16th International Conference on Amorphous Semiconductors-Science and Technology, Kobe, Japan.
  • September 1993, Pembicara, 15th International Conference on Amorphous Semiconductors-Science and Technology, Cambridge, England
  • April 1993, Pembicara, Material Research Society Conference, San Fransisco, USA
  • September 1991, Pembicara, 4th International Conference on Hopping and Related Phenomena, Marburg, Germany.
  • September 1991, Pembicara, 14th International Conference on Amorphous and Liquid Semiconductors, Garmisch-Partenkirchen, Germany
  • April 1991, Pembicara, Material Research Society Conference, Anaheim, USA

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