Now showing items 462-465 of 465

    • Would you give a quantum ring to your fiancee? 

      A quantum ring is a physical object similar to a real life ring that we find in our daily life, the only difference is in its very small nanometer dimensions (0.000000001 m). Furthermore, the ring is made of a semiconductor ...
      Universidad Nacional de Colombia Revistas electrónicas UN MOMENTO - Revista de Física. 2013
    • Untitled 

      We present a system for the production of fullerenes (C-GO. C-70, etc.) using an electric discharge between two graphite electrodes in an Helium atmosphere. In this apparatus the approach between both electrodes has been ...
      Universidad Nacional de Colombia Revistas electrónicas UN MOMENTO - Revista de Física. 1997
    • Untitled 

      In this paper the molecular replacement method is described. It has become recently in an important and useful strategy to determine the structure of biological macromolecules, when it is possible to have an homologous ...
      Universidad Nacional de Colombia Revistas electrónicas UN MOMENTO - Revista de Física. 1995
    • Untitled 

      The absorbed energy fraction, AF, taken from the breast of an adult woman was calculated for photon energies: 15, 20, 28 an 361 keV, emitted from a source located 20,30, 40 and 50 cm, in front of the breast. AF is estimated ...
      Universidad Nacional de Colombia Revistas electrónicas UN MOMENTO - Revista de Física. 2002