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IBM Journal of Research and Development

Issue 2 • March 1966

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Displaying Results 1 - 10 of 10
  • Formation of Built-in Light-emitting Junctions in Solution-grown GaP Containing Shallow Donors and Acceptors

    Publication Year: 1966, Page(s):114 - 121
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (599 KB)

    The growth of GaP from a gallium-rich solution is described and the morphology and dendritic growth habit of the crystals are discussed. By control of growth conditions it was possible to produce built-in junctions in crystals doped with the shallow donors, S, Se, or Te, and the shallow acceptor, Zn. Green junction electroluminescence of higher efficiency than has been reported heretofore was obse... View full abstract»

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  • Green Luminescence from Solution-grown Junctions in GaP Containing Shallow Donors and Acceptors

    Publication Year: 1966, Page(s):122 - 129
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (552 KB)

    Gallium phosphide diodes doped with shallow donors and acceptors that partially compensate one another in both the n- and p-regions give rise to bright green emission. This green emission is more efficient at room temperature than the so-called “A-line” emission commonly observed in lightly doped diodes. The peak energy of the green emission varies with the donor binding energy, and ... View full abstract»

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  • Effects of a Keeper on Thin Film Magnetic Bits

    Publication Year: 1966, Page(s):130 - 134
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (364 KB)

    When Permalloy films are used for computer storage, a magnetic keeper can improve performance by reducing the following undesirable conditions: stray fields from adjacent lines and from adjacent bits; the effect of current spreading in the ground plane; and trapped flux in the ground plane which opposes switching in the absence of a low reluctance path outside the bit. Theoretical analysis and exp... View full abstract»

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  • Pert as an Aid to Logic Design

    Publication Year: 1966, Page(s):135 - 141
    Cited by:  Papers (61)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (415 KB)

    A new application is presented for pert, the well-known statistical project-scheduling method. Using PERT, the logic designer could circumvent usually unrealistic worst-case criteria. He substitutes a formalized statistical method which determines (1) expected or most probable delays, (2) critical timing paths, (3) timing slack allowable between various inputs, and (4) probability of achieving an ... View full abstract»

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  • Design of a Printed Card Capacitor Read-Only Store

    Publication Year: 1966, Page(s):142 - 157
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (877 KB)

    The Printed Card Capacitor Read-Only Store system is introduced as one of three Read-Only Store (ROS) technologies presently employed in the IBM System/360 computers. A detailed description is given of the elementary storage structure—a capacitor matrix with a novel arrangement for rapidly and economically changing the matrix configuration. The changeable element is an etched or printed Myl... View full abstract»

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  • A Practical Class of Polynomial Codes

    Publication Year: 1966, Page(s):158 - 161
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (358 KB)

    Error detecting polynomial codes are usually formed by defining a correspondence between data bits and coefficients of the representative polynomial. These codes are easily implemented in hardware using shift registers; however, implementation in character-oriented processors may be too time consuming. A new class of polynomial codes is described for which a correspondence between n-bit data chara... View full abstract»

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  • Stimulated Emission Observed from an Organic Dye, Chloro-aluminum Phthalocyanine

    Publication Year: 1966, Page(s):162 - 163
    Cited by:  Papers (19)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (279 KB)

    We have observed that when a specific phthalocyanine solution (chloro-aluminum phthalocyanine dissolved in ethyl alcohol) is irradiated by a sufficiently powerful beam from a giant-pulse ruby laser, there occurs intense stimulated emission from the phthalocyanine molecules. The wavelength of this stimulated emission is centered at approximately 0.755 µ. Its spectral half-width was observed ... View full abstract»

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  • Technical Papers by IBM Authors Published Recently in Other Journals

    Publication Year: 1966, Page(s):164 - 180
    IEEE is not the copyright holder of this material | PDF file iconPDF (874 KB)
    Freely Available from IEEE
  • Recent IBM Patents Assigned to IBM

    Publication Year: 1966, Page(s):181 - 182
    IEEE is not the copyright holder of this material | PDF file iconPDF (239 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1966, Page(s):183 - 184
    IEEE is not the copyright holder of this material | PDF file iconPDF (206 KB)
    Freely Available from IEEE

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IBM T. J. Watson Research Center