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IBM Journal of Research and Development

Issue 2 • Date March 1976

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Displaying Results 1 - 12 of 12
  • Submicrometer Stripes and Bubbles in Amorphous Films

    Publication Year: 1976, Page(s):102 - 108
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (742 KB)

    Lorentz microscopy is used to study amorphous thin films of Gd-Co-Au and Gd-Co-Mo having a range of Q values. Stripe and bubble formation are shown as a function of perpendicular bias fields and pulsed or rotating in-plane fields. In the presence of an in-plane field, stripes contain a pair of Bloch lines and break into rows of Bloch-line containing bubbles. A unichiral stripe, however, forms a un... View full abstract»

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  • Bubble Lattice Motions Due to Modulated Bias Fields

    Publication Year: 1976, Page(s):109 - 122
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (955 KB)

    We observe that periodic variations of bias field can couple to a close-packed lattice of magnetic bubbles to produce a steady rotation of the bubble lattice (RBL). Pulsed fields excite various other many-body phases as well. The physical motions of such bubble arrays can be described by “lattice melting,” “evaporation,” and “rotating galaxies.” The RBL ph... View full abstract»

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  • Storage Management Operations in Linked Uniform Shift-Register Loops

    Publication Year: 1976, Page(s):123 - 131
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (543 KB)

    A new storage structure, called a uniform ladder, consists of a linear array of equal shift-register loops, each holding one record and linked by flow-steering switches. Data exchange across a loop boundary is mandatory if the controlling switch is on and forbidden if off. For MRU (Most Recently Used) storage management, the most important operation is the climbing of data to the top of the ladder... View full abstract»

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  • Effects of Abrupt Changes in Film Thickness on Magnetic Bubble Forces

    Publication Year: 1976, Page(s):132 - 137
    Cited by:  Papers (2)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (452 KB)

    Forces on a magnetic bubble due to abrupt asymmetric changes in the surface configuration of the magnetic film are investigated theoretically and experimentally. A model is derived for calculating the forces on a bubble as it is being moved by conductor propagation through a thickness gradient in the film. An experiment is described in which the forces necessary to move a bubble through this trans... View full abstract»

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  • Bases for Chain-complete Posets

    Publication Year: 1976, Page(s):138 - 147
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (604 KB)

    Various authors (especially Scott, Egli, and Constable) have introduced concepts of “basis” for various classes of partially ordered sets (posets). This paper studies a basis concept directly analogous to the concept of a basis for a vector space. The new basis concept includes that of Egli and Constable as a special case, and one of their theorems is a corollary of our results. This... View full abstract»

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  • Drop Formation from a Liquid Jet: A Linear One-dimensional Analysis Considered as a Boundary Value Problem

    Publication Year: 1976, Page(s):148 - 156
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (505 KB)

    Using a one-dimensional model, the author studied drop formation using a boundary value perturbation, rather than a spatially periodic one as considered by Rayleigh. The Rayleigh solution becomes the high jet velocity approximation to this linear analysis. At lower velocities the analysis shows that the medium becomes dispersive, and drop formation characteristics are quite different from that pre... View full abstract»

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  • Objects and Values: The Basis of a Storage Model for Procedural Languages

    Publication Year: 1976, Page(s):157 - 167
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (536 KB)

    A model for storage in procedural languages is presented. Its fundamental notion is to strictly distinguish values from storage objects. Several difficulties in current languages are resolved in this model, e. g., the problem of flexible locations and the meaning of the term type. In the light of the storage object/value dichotomy, several notions are found to be covered by the term type. The impl... View full abstract»

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  • Error Correcting Codes for Satellite Communication Channels

    Publication Year: 1976, Page(s):168 - 175
    Cited by:  Papers (2)  |  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (505 KB)

    This paper addresses the problem of efficient forward error correction on differentially encoded, quadriphase-shift-keying (DQPSK) channels. The approach is to design codes to correct the most probable error patterns. First the probability distribution of error patterns is derived. Then a class of convolutional codes that correct any single two-bit error is described. Finally a threshold decodable... View full abstract»

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  • Electric Motor Requirements for Positioning an Inertial Load

    Publication Year: 1976, Page(s):176 - 183
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (491 KB)

    This paper deals with the motor, the inertia ratio, and the power input requirements for moving an inertial load over a specified distance in a specified time. A linear speed-torque relationship is assumed, and selected motor parameters are normalized to the load to establish generally applicable solutions and characteristic curves. Emphasis is placed on the velocity-time diagrams and the relation... View full abstract»

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  • Recent Papers by IBM Authors

    Publication Year: 1976, Page(s):184 - 189
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (430 KB)

    Reprints of the papers listed here may usually be obtained by writing directly to the authors. The authors' IBM divisions are identified as follows: DPD is the Data Processing Division; FED, Field Engineering Division; FSD, Federal Systems Division; GPD, General Products Division; GSD, General Systems Division; OPD, Office Products Division; RES, Research Division; SCD, System Communications Divis... View full abstract»

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  • Recent IBM Patents

    Publication Year: 1976, Page(s):190 - 193
    IEEE is not the copyright holder of this material | PDF file iconPDF (333 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1976, Page(s):194 - 196
    IEEE is not the copyright holder of this material | PDF file iconPDF (283 KB)
    Freely Available from IEEE

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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