פרופ' אמריטוס ישעיהו ירניצקי

1928-2019

Professor Emeritus

Education

  • 1953 – B.Sc., Technion, I.I.T.
  • 1954 – Dipl. Ing., Technion, I.I.T.
  • 1961 – D.Sc., Faculty of Mechanical Engineering, Technion – I.I.T.

Research Interests

  • Development of technologies and machinery for diamond and gem dressing.
  • Various inventions in the fields of technology and machinery.
  • Design of intelligent machinery comprising mechanical electronic, electrooptical systems and computers.
  • Sintering of metallic bond diamond grinding wheels.
  • Electrodeposition (tools and jewelry)

Public Professional Activities

  • Head, Diamond Laboratory (1973-)
  • Chief Scientist and Head of Technological Diamond Lab., Diamond Institute, Ramat Gan (1970-81)
  • Member, Haifa Municipal Council (1973-78)
  • Chairman, “Kiryat Hinukh” School Association (1970-94)
  • Chairman, Academic Staff Organization, Technion (1979-81)
  • Initiator, Israel Diamond and Gemological Institutes (1975)

Honors and Awards

  • Distinguished engineer, Israel Association of Engrs. & Archs. (1993)

Selected Publications

  • R. Porat and Y. Yarnitsky, “The effect of diamond powder grain size on the rate of polishing diamond crystalographic planes”, C.I.R.P., Norway, (1989).
  • R. Porat and Y. Yarnitsky, “Correlation between the friction coefficient and the shear modulus of diamond”, International Plansee Seminar, Austria, (1989).
  • Y. Yarnitsky, and J.P.F. Sellschop, “Polishing Diamonds in various atmospheres”, II Diamond Conference, Bristol, U.K, (1989).
  • Y. Sofer, Y. Yarnitsky and S. Direnfeld, “Composite coatings on steel of a Ni-No matrix and diamond particles”, J. Surface and Coating Technology, (1990).
  • R. Porat and Y. Yarnitsky, “The effect of diamond powder grain size on the rate of polishing diamond crystallographic places”, C.I.R.P. Publication, Vol. 38, 319 – 321, (1989).
  • Y. Yarnitsky, “The Diamond and its processing”.
    Part I – General information – 200 p.
    Part II – The machining of Diamonds 250 p.
    Part III – Evaluation of Gem Diamonds – 200 p.