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IBM Journal of Research and Development

Issue 3 • Date July 1958

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Displaying Results 1 - 15 of 15
  • Table of Contents

    Publication Year: 1958, Page(s): 177
    IEEE is not the copyright holder of this material | PDF file iconPDF (187 KB)
    Freely Available from IEEE
  • A Direct-Reading Printed-Circuit Commutator for Analog-to-Digital Data Conversion

    Publication Year: 1958, Page(s):178 - 192
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (783 KB)

    A novel direct-readout printed-circuit commutator has been incorporated in the design of a shaft-to-digital converter system for analog-to-digital data conversion. The design avoids the use of supplementary coding or additional translation circuitry required to operate other shaft-to-digital converters. Methods are described for ensuring logical progressions of numerical data despite gearing error... View full abstract»

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  • Phase Equilibria in the Ferrite Region of the System Manganese-Iron-Oxygen

    Publication Year: 1958, Page(s):193 - 199
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    An important factor in growing crystals from the melt is an understanding of the phase relationships for systems involving the necessary elements. This investigation deals with the determination and interpretation of these relationships in the ferrite region of the system Mn-Fe-O and points out the conditions necessary to grow crystals along the Mn3O4-Fe3O... View full abstract»

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  • The Physical Interpretation of Mean Free Path and the Integral Method

    Publication Year: 1958, Page(s):200 - 203
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (430 KB)

    In previous papers, general expressions for the linear electronic transport constants of solids were obtained in terms of a conjugate function ψ related, by a linear inhomogeneous integral equation, to the function (of electron state) ψ measured by the “flux.” It is now shown that τψ=∫0... View full abstract»

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  • A Load-Sharing Matrix Switch

    Publication Year: 1958, Page(s):204 - 211
    Cited by:  Papers (17)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (550 KB)

    A matrix-switch winding pattern has been developed which allows the power from several pulse generators to be combined into a single high-power pulse to drive a computer core memory. This pulse may be directed into one of a group of outputs. The method of operation, including the logical basis for changes in number of outputs, is described. The device is suitable for the X-Y drivers of a transisto... View full abstract»

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  • Study of the Second-Order Ferroelectric Transition in Tri-Glycine Sulfate

    Publication Year: 1958, Page(s):212 - 217
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (365 KB)

    Results of measurements of the dielectric constant, dielectric nonlinearity and spontaneous polarization of tri-glycine sulfate are given. These data demonstrate clearly that this material exhibits a second-order ferroelectric transition. The properties discussed are described in terms of the usual expansion of the free energy in even powers of the polarization F(P,T)=F(O,T)+A(T-T0)P... View full abstract»

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  • Computation of Arcsin N for 0 < N < 1 Using an Electronic Computer

    Publication Year: 1958, Page(s):218 - 222
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (359 KB)

    All known subroutines for Arcsine are based on the relation Arcsin N = Arctan [N/(1−N 2)½]. Therefore, Arcsine is not computed as such but as an Arctangent. To avoid the loss of machine time caused by the computation of N/(1−N 2)½, a direct computation of Arcsine is proposed. A subroutine yielding the first six c... View full abstract»

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  • A Full Binary Adder Employing Two Negative-Resistance Diodes

    Publication Year: 1958, Page(s):223 - 231
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (459 KB)

    Full binary pulse addition may be performed using only two negative-resistance diodes. Amplified Sum and Carry outputs can be provided which are virtually in coincidence with the input signals. A full adder is described, employing Reeves-Cooke positive-gap diodes which operate with pulses of 20-millimicrosecond duration. View full abstract»

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  • Curve Fitting for a Model of Applied Research and Development Scheduling

    Publication Year: 1958, Page(s):232 - 248
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (785 KB)

    Analysis of the research and development process has suggested improved techniques for estimating the anticipated effort requirements for engineering projects. Logistic growth curves have been fitted to the time distribution of cumulative man-hours, and an effort-distribution array permits the extraction of meaningful information from historical cost records. These provide a consistent basis for a... View full abstract»

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  • The Bipolar Righi-Leduc Effect

    Publication Year: 1958, Page(s):249 - 251
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (289 KB)

    Recent measurements of the thermal conductivity of semiconductors have disclosed that, for PbTe,1 InSb,2, 3, 4 Bi2 Te3,5, 6 and Germanium,1, 7, 8 among others, an anomalous component, rapidly increasing with temperature, appears at the higher temperatures. Such an effect might b... View full abstract»

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  • Magnetic Field Plotter for Superconducting Films

    Publication Year: 1958, Page(s):252 - 254
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (291 KB)

    Detailed analysis of the trapped-flux memory cell1 and other superconducting film devices will depend on a complete description of the magnetic field configurations under given operating conditions. This note describes a sensitive, high-resolution apparatus which uses a conical vapor-deposited probe for plotting the magnetic field distributions of superconducting films. The use of highr... View full abstract»

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  • IBM Technical Papers Published in Other Journals

    Publication Year: 1958, Page(s):255 - 258
    IEEE is not the copyright holder of this material | PDF file iconPDF (364 KB)
    Freely Available from IEEE
  • Recent IBM Patents

    Publication Year: 1958, Page(s): 259
    IEEE is not the copyright holder of this material | PDF file iconPDF (154 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1958, Page(s):260 - 261
    IEEE is not the copyright holder of this material | PDF file iconPDF (196 KB)
    Freely Available from IEEE
  • Contents of Previous Four Issues

    Publication Year: 1958, Page(s):262 - 263
    IEEE is not the copyright holder of this material | PDF file iconPDF (270 KB)
    Freely Available from IEEE

Aims & Scope

The IBM Journal of Research and Development is a peer-reviewed technical journal, published bimonthly, which features the work of authors in the science, technology and engineering of information systems.

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Editor-in-Chief
Clifford A. Pickover
IBM T. J. Watson Research Center