IBM Journal of Research and Development

Issue 5 • Sep. 1971

Filter Results

Displaying Results 1 - 13 of 13
  • Multi-fluid Subdued Boiling; Theoretical Analysis of Multi-fluid Interface Bubbles

    Publication Year: 1971, Page(s):342 - 354
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (937 KB)

    The recently discovered boiling phenomenon called “multi-fluid subdued boiling” is discussed. It has been observed that when a beaker containing two immiscible liquids of dissimilar densities is heated at the bottom, the vapor bubbles rise in the lower liquid until they reach the liquid-liquid interface. There the bubbles are trapped, and after a short period of time they collapse. A... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Procedure for Implementing the Fast Fourier Transform on Small Computers

    Publication Year: 1971, Page(s):355 - 363
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (724 KB)

    A technique has been developed that adapts the Fast Fourier Transform algorithm for implementation on computers having relatively long multiplication times. The technique is particularly well suited to real-time processing on a small data acquisition computer such as the IBM System/7. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Generation of Synchronous Data Transmission Signals by Digital Echo Modulation

    Publication Year: 1971, Page(s):364 - 377
    Cited by:  Papers (5)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (848 KB)

    This paper shows the basic similarities among various data transmission techniques. It generalizes the concept of how the signal element serves as a unifying feature of various modulation schemes. The present approach permits an extension of the digital echo modulation technique, originally introduced by A. Croisier and J-M. Pierret, to cover most of the cases of digital data transmission. The pra... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Activation Energy for Electromigration in Aluminum Films Alloyed with Copper

    Publication Year: 1971, Page(s):378 - 383
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (515 KB)

    The rate of electromigration in thin films of aluminum and aluminum alloyed with copper has been determined by measuring the changes in resistance of stripes subjected to a current density of 4×106 A/cm2. At temperatures in the range from 100 to 200°C the activation energy for electromigration has been found to have the same value for both the pure and the coppe... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of Logic Circuit Technology for IBM System/370 Models 145 and 155

    Publication Year: 1971, Page(s):384 - 390
    Cited by:  Papers (2)  |  Patents (29)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (745 KB)

    Monolithic System Technology (MST) is a microelectronic circuit family consisting of high-density monolithic circuit chips on ceramic substrates. Using current-switch emitter follower (CSEF) logic, the technology is designed to provide a balanced reflection of cost and performance requirements. One version, MST-2, has been developed for use primarily in the middle range of System/370—the Mo... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The IBM 3803/3420 Magnetic Tape Subsystem

    Publication Year: 1971, Page(s):391 - 400
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (814 KB)

    The design innovations in the IBM 3803 Tape Control Unit and the IBM 3420 Magnetic Tape Unit are discussed. The new design concepts include a full readback parity check, a system of microprogram control that obtains high operating rates through overlap of channel control and motion control functions, a new phase-error detection system, a modified dual-density recording feature and a new interface ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Thermal Problems of the CW Injection Laser

    Publication Year: 1971, Page(s):401 - 404
    Cited by:  Papers (1)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (448 KB)

    We describe the theoretical dependence of emitted light power on current in a continuously operating p-n junction laser, based on an injection laser model previously developed by the author. The analysis relates power output to threshold current, electrical resistance, thermal resistance, and external quantum efficiency of the laser, all quantities that can be independently measured or calculated ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ultra-high-speed Operation of Josephson Tunneling Devices

    Publication Year: 1971, Page(s):405 - 407
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (368 KB)

    Switching times of large Josephson devices have been measured. We report gate switching times of 85 ps and array cycle times of an elementary memory cell of 550 ps. Although these times are expected to be smaller in more realistic miniaturized devices, they represent to our knowledge, the shortest times for such circuits ever reported in any technology. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Synchronization in a Wideband Optical Data Transmission System

    Publication Year: 1971, Page(s):408 - 412
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (452 KB)

    An optical synchronization technique is described for the demultiplexer of a wideband optical data transmission system. In this system, the closely spaced optical pulses of interleaved PCM channels are “space sorted” by a coincidence detection technique using an optical reference waveform generated in the receiver. For synchronization of the reference waveform with a spatial waveform... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Direct Technique for Improving a Matrix Inverse

    Publication Year: 1971, Page(s):413 - 417
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    A method is shown that transforms the problem of inverting an ill-conditioned matrix to one of inverting a diagonally dominant matrix. An error analysis is outlined and the method is compared in theory and in result with the commonly used iterative methods. This direct method is demonstrated to be the limiting case of an nth-order iterative procedure as n approaches infinity. Examples are given th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Recent Papers by IBM Authors

    Publication Year: 1971, Page(s):418 - 423
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (578 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; FED, Field Engineering Division: FSD, Federal Systems Division; GSD, General Systems Division; OPD, Ofice Product... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Patents Recently Issued to IBM Inventors

    Publication Year: 1971, Page(s):424 - 428
    IEEE is not the copyright holder of this material | PDF file iconPDF (372 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1971, Page(s):427 - 428
    IEEE is not the copyright holder of this material | PDF file iconPDF (337 KB)
    Freely Available from IEEE

Aims & Scope

Meet Our Editors

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