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IBM Journal of Research and Development

Issue 2 • March 1971

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Displaying Results 1 - 13 of 13
  • Preface to papers on Mechanics of Materials

    Publication Year: 1971, Page(s): 102
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (217 KB)

    The principal subject of this issue is an aspect of analytical design that we call “the mechanics of materials.” We define this term to mean “the study of the natural properties of engineering materials so as to control their behavior in use,” and have selected seven papers representing work to which it applies. View full abstract»

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  • Wear of Electrical Contacts due to Small-amplitude Motion

    Publication Year: 1971, Page(s):103 - 107
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (516 KB)

    The “IBM wear model,” which has previously been used to describe the wear of electrical contacts as a result of gross sliding motion, is used to describe contact wear in the case of small-amplitude sliding motion. This model was applied to a particular contact configuration on which a series of wear tests was performed. The empirical results of the tests are compared to the theoretic... View full abstract»

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  • Effect of Hammer Length and Nonlinear Paper-ribbon Characteristics on Impact Printing

    Publication Year: 1971, Page(s):108 - 115
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (709 KB)

    An analysis of the impact process in a particular type of high-speed printer was undertaken to determine the effect of hammer length on the contact time. The hammer is modeled as a one dimensional wave propagation medium and the paper-ribbon combination as a dissipative, nonlinear medium with hysteresis. The integrated macroscopic viscoelastic parameters for a particular impact geometry and hammer... View full abstract»

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  • Adhesion and Partial Slip between Normally Loaded Round Surfaces

    Publication Year: 1971, Page(s):116 - 122
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (654 KB)

    A simple mechanism is sought to account for the frictional energy losses encountered in the mutual contact surface of two bodies pressed normally against each other. The mathematical model of Coulomb friction is assumed valid, and it is shown that slip between the contacting surfaces develops in the outlying regions of contact. This model, used in conjunction with a numerical scheme, leads to a se... View full abstract»

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  • Analysis of Defect Distribution in Transistor Structures with Reflection and Transmission X-Ray Topography

    Publication Year: 1971, Page(s):123 - 131
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (941 KB)

    Reflection and transmission x-ray topography can be combined to isolate and identify dislocations that penetrate the active junctions of transistor structures in integrated circuit wafers. This is accomplished by reconstructing the defect distribution normal to the surface as viewed in transmission (volume-sensitive) and reflection (surface-sensitive) x-ray topography. The combination of surface a... View full abstract»

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  • Effect of Extremely Thin Nitrogenous Surface Films on Phosphorus-impurity Profiles in Silicon

    Publication Year: 1971, Page(s):132 - 139
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (691 KB)

    In open-tube diffusion furnaces, nitrogen is often used as a carrier gas for impurities. Nitrogen flowing over silicon wafers at the diffusion temperature creates extremely thin surface films, which act as strong diffusion barriers. Similar barriers are formed on silicon wafers even in capsule-diffusion systems because of the residual atmosphere. Phosphorus-impurity profiles are found to be kinked... View full abstract»

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  • Molecular Engineering in the Development of Materials for Thermoplastic Recording

    Publication Year: 1971, Page(s):140 - 150
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (889 KB)

    A number of internally plasticized copolymers and terpolymers have been prepared which are shown to be suitable for thermoplastic recording. These materials were responsive to both in-air and in-vacuum recording techniques, where the electrostatic charge is applied by corona charging or electron beams, respectively. Several of these materials were tailored for Schlieren optical readout while other... View full abstract»

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  • On the Correlation between Domain Size and Coercive Force in Grain-oriented 3.25% Si-Fe

    Publication Year: 1971, Page(s):151 - 152
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (285 KB)

    A method is described for measuring the size of the largest spike-shaped magnetic domains on surfaces of grain-oriented 3.25% Si-Fe. Values of coercive force, obtained by using measured spike-domain size in a previously derived empirical expression correlating spike size with the coercive force in silicon-iron, are in close agreement with coercive force values obtained from B-H loop measurements. ... View full abstract»

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  • Segmentation Methods for Recognition of Machine-printed Characters

    Publication Year: 1971, Page(s):153 - 165
    Cited by:  Papers (15)  |  Patents (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1102 KB)

    This paper reports an investigation of some methods for isolating, or segmenting, characters during the reading of machine-printed text by optical character recognition systems. Two new segmentation algorithms using feature extraction techniques are presented; both are intended for use in the recognition of machine-printed lines of 10-, 11- and 12-pitch serif-type multifont characters. One of the ... View full abstract»

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  • System Validation by Three-level Modeling Synthesis

    Publication Year: 1971, Page(s):166 - 174
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (795 KB)

    The experimental three-level system modeling technique discussed in this paper can be used during the design stage of a system for identifying mismatches among the architectural, microprogramming, and hardware logic levels. Compatible switching between modeling levels is emphasized. Execution of an application program by the architectural and microprogramming level models with switching between le... View full abstract»

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  • Recent Papers by IBM Authors

    Publication Year: 1971, Page(s):175 - 178
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (501 KB)

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

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  • Patents Recently Issued to IBM Inventors

    Publication Year: 1971, Page(s):179 - 181
    IEEE is not the copyright holder of this material | PDF file iconPDF (333 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1971, Page(s):182 - 184
    IEEE is not the copyright holder of this material | PDF file iconPDF (372 KB)
    Freely Available from IEEE

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