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IBM Journal of Research and Development

Issue 1 • Jan. 1965

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Displaying Results 1 - 11 of 11
  • Ab Initio Computations in Atoms and Molecules

    Publication Year: 1965, Page(s):2 - 19
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (933 KB)

    The present status of ab initio computations for atomic and molecular wave functions is analyzed in this paper, with special emphasis on the work done at the IBM Research Laboratory, San Jose. The Roothaan-Hartree-Fock method has been described in detail for atomic systems. A systematic tabulation of atomic Hartree-Fock functions has been made available in an extended supplement to this paper.... View full abstract»

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  • Automatic Distortion Correction for Efficient Pulse Transmission

    Publication Year: 1965, Page(s):20 - 30
    Cited by:  Papers (7)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (742 KB)

    Automatic correction of pulse distortion provides the prospect for materially extending the efficiency of data communications over telephone networks. Systems that will compensate automatically for deficiencies in the phase and amplitude characteristics of a transmission channel are shown to be technically feasible. Two specific systems are demonstrated: The first, a “time-reversal” ... View full abstract»

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  • Active Image Formation in Lasers

    Publication Year: 1965, Page(s):31 - 46
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (798 KB)

    An optical cavity is described in which the modes are determined as stationary states of the diffraction-limited object/image transformation of classical optics; these modes are selected by the insertion of controls into the optical cavity and lead to field distributions which image these controls. When the cavity is driven by an active medium, laser oscillation can occur, and this is discussed in... View full abstract»

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  • On Relations Defined by Generalized Finite Automata

    Publication Year: 1965, Page(s):47 - 68
    Cited by:  Papers (9)  |  Patents (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1142 KB)

    A transduction, in the sense of this paper, is a n-ary word relation (which may be a function) describable by a finite directed labeled graph. The notion of n-ary transduction is co-extensive with the Kleenean closure of finite n-ary relations. The 1-ary transductions are exactly the sets recognizable by finite automata. However, for n > 1 the relations recognizable by automata constitute a... View full abstract»

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  • Amplification of Sound by Hot Electrons

    Publication Year: 1965, Page(s):69 - 70
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    It is well known that sound waves can be amplified in a solid by electrons or holes having a drift velocity, in the propagation direction, greater than the velocity of At least at low temperatures, an electric field strong enough to induce a drift velocity of this magnitude, in a semiconductor, can result in a “hot electron” state. 4,5 The purpose of the present communicat... View full abstract»

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  • Technical Papers by IBM Authors Published Recently in Other Journals

    Publication Year: 1965, Page(s):71 - 84
    IEEE is not the copyright holder of this material | PDF file iconPDF (1043 KB)
    Freely Available from IEEE
  • Recent IBM Patents

    Publication Year: 1965, Page(s):85 - 86
    IEEE is not the copyright holder of this material | PDF file iconPDF (205 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1965, Page(s): 87
    IEEE is not the copyright holder of this material | PDF file iconPDF (211 KB)
    Freely Available from IEEE
  • Contents of previous two issues

    Publication Year: 1965, Page(s):88 - 89
    IEEE is not the copyright holder of this material | PDF file iconPDF (246 KB)
    Freely Available from IEEE
  • Errata [D. P. Seraphim, A. E. Brennemann, F. M. d'Heurle and H. L. Friedman, IBM Journal 8,400-409 (September, 1964)]

    Publication Year: 1965, Page(s): 89
    IEEE is not the copyright holder of this material | PDF file iconPDF (231 KB)
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  • Tables of Atomic Functions

    Publication Year: 1965, Page(s):87 - 89
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (9143 KB)

    Why compute atomic Hartree-Fock functions, an approximation 30 years old, when most of contemporary physics pays relatively minor attention to atomic physics? The simple answer is that there are several unsettled problems and gaps in our knowledge of the electronic structure of the periodic system and that the Hartree-Fock method is presently the most efficient technique available. In the present ... View full abstract»

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IBM T. J. Watson Research Center