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IBM Journal of Research and Development

Issue 6 • Nov. 1968

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Displaying Results 1 - 13 of 13
  • Error Detection and Correction in a Photo-Digital Storage System

    Publication Year: 1968, Page(s):422 - 430
    Cited by:  Papers (6)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (503 KB)

    An error-correction system has been implemented for data stored in the IBM Photo-Digital Storage System. Hardware is used for encoding and error detection, and a processor-controller is used, on a time-sharing basis, for error correction. A Reed-Solomon code is used to obtain a very low error rate in spite of flaws affecting the recorded bits. This approach is applicable to systems which require c... View full abstract»

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  • Small-signal Stability Criterion for Electrical Networks Containing Lossless Transmission Lines

    Publication Year: 1968, Page(s):431 - 440
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (669 KB)

    A stability criterion is derived for networks containing lossless transmission lines as well as the usual lumped electrical elements. The criterion is stated in terms of the transmission line parameters and scattering matrix measurements made at the terminals of the lumped part of the network. The mathematical proof of the stability theorem involves some new results concerning a special system of ... View full abstract»

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  • Calculation of Liquid Droplet Profiles from Closed-Form Solution of Young-Laplace Equation

    Publication Year: 1968, Page(s):441 - 447
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (451 KB)

    A closed-form solution is obtained for a two-dimensional version of the Young-Laplace equation governing the shape of the interface between immiscible liquids. This solution enables designers of liquid junctions (in, for example, soldering or ink printing applications) to calculate profiles using certain junction dimensions as boundary conditions in the equations. Calculated profiles are superimpo... View full abstract»

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  • X-ray Diffraction Topography of Germanium Wafers

    Publication Year: 1968, Page(s):448 - 457
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (618 KB)

    X-ray diffraction topography in transmission and reflection has been employed to analyze crystal faults and stresses in germanium wafers caused by deposition of oxide layers, epitaxy and planar diffusion. Localized diffusion of arsenic, gallium and phosphorus normally does not introduce stresses sufficiently high to generate dislocations in germanium (011) wafers. However, heat treatment of german... View full abstract»

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  • Photo-n-p Junctions in ZnTe

    Publication Year: 1968, Page(s):458 - 464
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (539 KB)

    We have demonstrated ZnTe devices with efficient (about 1%) light emission at 77 °K in which the injection mechanism is a forward-biasd photo-n-p junction. In one, Al and Cd are diffused into highly p-type ZnTe:P to produce an Al-doped region 70 µm deep with a 20 µm surface layer of average composition Zn0.6Cd0.4Te. Light emission (575 nm) is observed for... View full abstract»

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  • Algebraically Generalized Recursive Function Theory

    Publication Year: 1968, Page(s):465 - 475
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (682 KB)

    The Uniformly Reflexive Structure (URS) introduced by E. G. Wagner is, for this paper, a nonassociative algebra consisting of a domain and a binary operation satisfying the following axioms: 0. (∃*)(∀a)[a·* = *·a = *]; 1. (∃ψ)(∀ a,b,c,d)[ψ ≠ * & ((a ≠ * & b ≠ * & c ≠ * & d ≠ *) →((a = ... View full abstract»

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  • Design and Fabrication of Subnanosecond Current Switch and Transistors

    Publication Year: 1968, Page(s):476 - 482
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (492 KB)

    A junction-isolated integrated circuit in silicon is described, having a switching speed of 320 picoseconds in a package which by itself causes a 120 ps delay. The design of the transistor used in this circuit was obtained by simulating the transistor as a computerized, two-dimensional distributed model. The improvements required in the transistor technology were thus predetermined and the design ... View full abstract»

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  • New Annealing Effects on the Bulk Corrosion Potential of Germanium

    Publication Year: 1968, Page(s):483 - 485
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (348 KB)

    The corrosion potential (Uk) of n-type Ge with donor concentrations less than 1018 cm−3 was drastically changed (“ΔUk effect”) by heat treatments between 600 and 800°C. The formation of recombination centers due to Cu contamination is probably the principal cause. View full abstract»

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  • Recent Papers by IBM Authors

    Publication Year: 1968, Page(s):486 - 488
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (409 KB)

    Reprints of the papers listed here may usually be obtained most efficiently by writing directly to the authors. The authors' IBM divisions and locations are identified as follows: ASDD is the Advanced Systems Development Division; CD, Components Division; DPD, Data Processing Division; FSD, Federal Systems Division; RES, Research Division; SDD, Systems Development Division and SMD, Systems Manufac... View full abstract»

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  • Patents Recently Issued to IBM Inventors

    Publication Year: 1968, Page(s):489 - 490
    IEEE is not the copyright holder of this material | PDF file iconPDF (272 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1968, Page(s):491 - 492
    IEEE is not the copyright holder of this material | PDF file iconPDF (290 KB)
    Freely Available from IEEE
  • Contents of previous issue

    Publication Year: 1968, Page(s): 493
    IEEE is not the copyright holder of this material | PDF file iconPDF (195 KB)
    Freely Available from IEEE
  • Errata [Erratum]

    Publication Year: 1968, Page(s): 493
    IEEE is not the copyright holder of this material | PDF file iconPDF (195 KB)
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