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IBM Journal of Research and Development

Issue 1 • Date Jan. 1957

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Displaying Results 1 - 18 of 18
  • Table of Contents

    Publication Year: 1957, Page(s): 1
    IEEE is not the copyright holder of this material | PDF file iconPDF (203 KB)
    Freely Available from IEEE
  • Domain Orientation in Barium Titanate Single Crystals

    Publication Year: 1957, Page(s):2 - 7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (722 KB)

    An acid etching technique makes visible the domain structure of barium titanate crystals as reported by Hooton and Merz. Earlier observations by Merz of the mechanism of switching are confirmed by experiments using this technique. A discussion of domain wall formation in the orthorhombic state leads to the explanation of observed domain patterns. Photomicrographs are shown and discussed. View full abstract»

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  • Design of Logic for Recognition of Printed Characters by Simulation

    Publication Year: 1957, Page(s):8 - 18
    Cited by:  Papers (5)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (868 KB)

    A logic for the recognition of printed characters employing a “proportional parts” method has been tested extensively by simulation. The proportional parts method relates the identity of a character to the relative size and position of character elements detected by optical scanning along closely spaced vertical lines. The video information from each scan is coded to designate the nu... View full abstract»

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  • On the Theory of Relaxation Processes

    Publication Year: 1957, Page(s):19 - 31
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (629 KB)

    A general procedure is given for finding the equation of motion of the density matrix of a system in contact with a thermal bath, as for example a nuclear spin system weakly coupled to a crystal lattice. The thermal bath is treated both classically and quantum mechanically, and the theory is similar to, and a generalization of, conventional theories of time proportional transition probabilities. R... View full abstract»

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  • A Three-Dimensional Printed Back Panel

    Publication Year: 1957, Page(s):32 - 38
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (682 KB)

    A new design for interconnections of printed circuit packages in the IBM 608 Transistorized Computer is described. The three-dimensional arrangement for connections among circuit cards is shown to be flexible in design and adaptable to a highly mechanized manufacturing method. An arrangement for automatic cabling is discussed briefly. The various relationships among the design problems for circuit... View full abstract»

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  • Clarification of First-Order Semiconduction Effects through Use of Electrochemical Potentials

    Publication Year: 1957, Page(s):39 - 43
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (343 KB)

    When deviations from equilibrium conditions are small, the net rate at which electrons are interchanged between two groups of electrons which are separately in states of thermodynamic equilibrium is proportional to the difference of the Fermi levels applying to the two groups. With the help of this principle the first-order treatment of conduction effects in semiconductors (appropriate when carrie... View full abstract»

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  • A Survey of Contact Resistance Theory for Nominally Clean Surfaces

    Publication Year: 1957, Page(s):44 - 48
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    While the theory of electrical contact resistance is, for the most part, well known, it is difficult to apply directly to the prediction of experimental results since, in general, the theory involves microscopic parameters beyond the control of the investigator. Recent measurements of contact resistance as a function of the applied contact load, carried out under specified conditions, have yielded... View full abstract»

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  • Development of the Electrostatic Clutch

    Publication Year: 1957, Page(s):49 - 56
    Cited by:  Patents (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (581 KB)

    A brief historical review of the electrostatic clutch operating on the Johnsen-Rahbek effect is presented. Mechanical design of a clutch, special lubrication, and the fabrication of electronically conductive clutch facing material are described. A high-speed, high torque-to-inertia ratio test model with bi-directional shaft control is described. With the clutch operating at 2500 rpm on 30 milliamp... View full abstract»

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  • An Analysis of Diffusion in Semiconductors

    Publication Year: 1957, Page(s):57 - 61
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (377 KB)

    In the experimental determinations of the coefficients of diffusion of impurities in semiconductors reported to date, it has usually been assumed that these coefficients do not vary with concentration. This assumption is questioned here. Interactions between acceptors, donors, electrons, and holes may lead to complicated diffusion equations, as shown by an analysis based on Onsager's theory. In pa... View full abstract»

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  • The Random-Access Memory Accounting Machine—I. System Organization of the IBM 305

    Publication Year: 1957, Page(s):62 - 71
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (701 KB)

    The design features of a new automatic data processing machine for business applications, utilizing a random-access memory system, are described. Unlike the usual “batch” method of machine-processing business transactions, the technique used permits transfer of information between any two points in the system and allows multi-choice decisions according to the current status of the in... View full abstract»

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  • The Random-Access Memory Accounting Machine—II. The Magnetic-Disk, Random-Access Memory

    Publication Year: 1957, Page(s):72 - 75
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (411 KB)

    The design features are described of a new large-capacity memory device having random access to information stored magnetically on rotating disks. The mechanical arrangement of an array of 50 disks is shown, and details are given of the pair of magnetic recording heads, which are spaced accurately from the disk surface by air jets. The access mechanism and the timing system for positioning the hea... View full abstract»

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  • Logical Design of the Digital Computer for the SAGE System

    Publication Year: 1957, Page(s):76 - 83
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (528 KB)

    Special design features and performance criteria are described for the logical system in the digital computer used in the SAGE (Semi-Automatic Ground Environment) air defense system. Design details are given for the arithmetic element, high-speed multiply, index registers, input-output control, and magnetic drum buffer. The system is designed according to special military application requirements ... View full abstract»

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  • Simple Constant-Temperature Oven and Control System

    Publication Year: 1957, Page(s):84 - 89
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (426 KB)

    A number of laboratory measurements require a constant and uniform ambient temperature. A thermocouple-monitored system consisting of an oven, a stable reference source and a chopper-amplifier controller unit has been developed. This system provides a stable and uniform temperature, ±0.1°C from 200° to 1050°C in a cylindrical region 5 cm in diameter and 12 cm long. Each... View full abstract»

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  • Lattice Parameters of Zn3As2

    Publication Year: 1957, Page(s):90 - 92
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (307 KB)

    Since current research on the intermetallic compound Zn3As2 has indicated desirable semiconductor properties, a new determination has been made of its crystal lattice, which had been reported variously as cubic and as tetragonal. View full abstract»

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  • A General Theory of Multiple Spin Echoes

    Publication Year: 1957, Page(s):93 - 95
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (257 KB)

    A theory has been developed for the amplitudes and shapes of a series of spin echoes produced by a train of rectangular pulses of arbitrary number, amplitude, duration and time sequence. The treatment is based upon Jaynes' method1 of solving the Bloch equation in terms of the 2 × 2 rotation matrices of spinor theory. Whereas the formalism set up by Jaynes' for the solution of spe... View full abstract»

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  • IBM Technical Papers Published in Other Journals

    Publication Year: 1957, Page(s):96 - 97
    IEEE is not the copyright holder of this material | PDF file iconPDF (277 KB)
    Freely Available from IEEE
  • Recent IBM Patents

    Publication Year: 1957, Page(s): 98
    IEEE is not the copyright holder of this material | PDF file iconPDF (144 KB)
    Freely Available from IEEE
  • The Authors

    Publication Year: 1957, Page(s):99 - 100
    IEEE is not the copyright holder of this material | PDF file iconPDF (192 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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Meet Our Editors

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