IBM Journal of Research and Development

Issue 4 • Oct. 1959

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Displaying Results 1 - 12 of 12
  • Some New Aspects of Color Perception

    Publication Year: 1959, Page(s):312 - 325
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1166 KB)

    A mathematical analysis is made of Land's recent experiments which showed that fully colored pictures can be produced by a two-color projection system. Although Land's results apparently had been at variance with the classical theories of color perception, it has now been found possible to explain the experiments within the framework of those theories and in conjunction with well-known phenomena i... View full abstract»

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  • Algebraic Topological Methods for the Synthesis of Switching Systems—Part III: Minimization of Nonsingular Boolean Trees

    Publication Year: 1959, Page(s):326 - 344
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1537 KB)

    An algorithm is given for solving a general problem in combinational switching-circuit minimization theory. The circuits considered consist of a disjunction (OR-ing together) of trees of any set of logical elements, with the restriction that in any given tree no input appears more than once. To each logical element is attached a positive cost. A method is presented for designing a minimum-cost cir... View full abstract»

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  • Theory of a Fast-Switching Electron-Beam Frequency Divider

    Publication Year: 1959, Page(s):345 - 354
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (928 KB)

    A velocity-modulated electron-beam microwave tube is described which can be operated as a frequency divider. Its operation is analyzed in terms of velocity-modulation bunching theory, neglecting space-charge forces. Because of the existence of two stable states opposite in phase, such a divider can be advantageously employed in a microwave logical system. The transient behavior of the device is di... View full abstract»

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  • On the Reduction of Continuous Problems To Discrete Form

    Publication Year: 1959, Page(s):355 - 363
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (857 KB)

    A continuous problem, defined as one involving derivatives or integrals, is to be reduced to a discrete problem, involving only algebraic or evaluative operations. An approach involving cells instead of points is taken, and the unknown function is approximated by functional representations, each associated with one cell and an associated set of parameters. Suitable operations are then defined, eac... View full abstract»

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  • Esaki Tunneling

    Publication Year: 1959, Page(s):364 - 371
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (827 KB)

    Tunneling, between propagating electron states, at a semiconductor junction is discussed in terms of customary quantum transition theory for the matrix elements of the hamiltonian between the states representing reflection of an electron (in either band) from the junction. The coordinate representation for the wavefunctions of these states is investigated, and tunneling probabilities (ratios of tr... View full abstract»

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  • A 3000-Mc Lumped-Parameter Oscillator Using an Esaki Negative-Resistance Diode

    Publication Year: 1959, Page(s):372 - 374
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (407 KB)

    The use of the negative-resistance diode discovered by L. Esaki1 (sometimes referred to as the tunnel diode) in very-high-frequency oscillator circuits employing wave guides and cavities as tuned elements has met with difficulties as a result of so-called parasitic oscillations that arise from the necessity of driving the circuit from a very low-impedance dc source.2 This com... View full abstract»

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  • Millimicrosecond Magnetization Reversal in Thin Magnetic Films

    Publication Year: 1959, Page(s):375 - 376
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (277 KB)

    From ferromagnetic resonance experiments and from calculations based on the modified Landau-Lifschitz equation, switching times for the coherent rotation of the magnetization in thin, permalloy-type films have been predicted to lie in the range of 1 mi1limicrosecond.1 First measurements by D.O. Smith et al,2 utilizing a travelling-wave oscilloscope with a response time of 2 m... View full abstract»

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  • Germanium PNPN Thyratron

    Publication Year: 1959, Page(s):377 - 379
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (493 KB)

    This note describes a germanium PNPN switching device with thyratron-like characteristics. Unlike other four-layer switching devices described recently in the literature, this device does not rely on alpha-variation for switching. Its alpha is essentially constant and large enough to make the device regenerative. The device is normally biased “off” and it may be switched “on&#... View full abstract»

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  • IBM Technical Papers Published in Other Journals

    Publication Year: 1959, Page(s):380 - 385
    IEEE is not the copyright holder of this material | PDF file iconPDF (804 KB)
    Freely Available from IEEE
  • Recent IBM Patents

    Publication Year: 1959, Page(s):386 - 387
    IEEE is not the copyright holder of this material | PDF file iconPDF (227 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1959, Page(s):388 - 389
    IEEE is not the copyright holder of this material | PDF file iconPDF (277 KB)
    Freely Available from IEEE
  • Contents of Previous Four Issues

    Publication Year: 1959, Page(s): 390
    IEEE is not the copyright holder of this material | PDF file iconPDF (248 KB)
    Freely Available from IEEE

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Editor-in-Chief
Rachel D'Annucci Henriquez
IBM T. J. Watson Research Center