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IBM Journal of Research and Development

Issue 6 • Date Nov. 1969

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Displaying Results 1 - 13 of 13
  • Energy Diagram Method for Bragg Reflections in Low Energy Electron Diffraction (LEED) Spectra

    Publication Year: 1969 , Page(s): 646 - 661
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1369 KB)  

    A point of view and a method of calculation derived from energy band theory are applied to the problem of finding energies of Bragg reflections from a given crystal. Energy curves are defined and calculated which describe the behavior of individual diffracted electron beams for a given set of beams incident on a particular face of the crystal. Intersections of these curves correspond to and identi... View full abstract»

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  • Two-dimensional Mathematical Analysis of a Planar Type Junction Field-effect Transistor

    Publication Year: 1969 , Page(s): 662 - 674
    Cited by:  Papers (5)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1196 KB)  

    A two-dimensional mathematical analysis is presented of the steady-state mechanisms of operation within a planar type junction field-effect transistor (JFET). This analysis shows that the potential distribution within the source-drain channel follows from solutions of Poisson's equation rather than from Laplace's equation. In particular, velocity-limited carrier transport produces a region of carr... View full abstract»

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  • Fast Sequential Decoding Algorithm Using a Stack

    Publication Year: 1969 , Page(s): 675 - 685
    Cited by:  Papers (190)  |  Patents (32)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1023 KB)  

    In this paper a new sequential decoding algorithm is introduced that uses stack storage at the receiver. It is much simpler to describe and analyze than the Fano algorithm, and is about six times faster than the latter at transmission rates equal to Rcomp, the rate below which the average number of decoding steps is bounded by a constant. Practical problems connected with implementing t... View full abstract»

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  • RF Sputtered Strontium Titanate Films

    Publication Year: 1969 , Page(s): 686 - 695
    Cited by:  Papers (11)  |  Patents (8)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (965 KB)  

    Two deposition parameters are important in rf sputtering of SrTiO3 films: the oxygen-argon content ratio, and the substrate temperature. More than 1% oxygen is needed to produce insulating films; the exact percentage required depends on system cleanliness. Both dielectric constant and crystallite size increase with increasing substrate temperature. Films of 2400 Å deposited at 50... View full abstract»

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  • Cation Deficiencies in RF Sputtered Gadolinium Iron Garnet Films

    Publication Year: 1969 , Page(s): 696 - 702
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (660 KB)  

    RF sputtering of stoichiometric, polycrystalline gadolinium iron garnet material results in films significantly deficient in iron content. The cation deficiency is shown to be quite sensitive to preparatory conditions and reflects itself markedly in the magnetic and structural properties of the resultant films. Temperature dependent sticking probabilities and selective resputtering at the growing ... View full abstract»

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  • A Nonlinear Digital Filter for Industrial Measurements

    Publication Year: 1969 , Page(s): 703 - 710
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (544 KB)  

    A simple algorithm is presented for nonlinear filtering of a time series composed of a gaussian component, pulses and steps. The method used is a combination of simple statistical techniques. The main advantage is claimed to be a scheme for adaptation of the filter parameters. View full abstract»

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  • Strain and Temperature Distributions in a Thermally Activated Cantilever

    Publication Year: 1969 , Page(s): 711 - 716
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (528 KB)  

    A simplified model for a transverse vibrating beam has been shown to characterize the cantilever very well. The forcing function is dependent on temperature field, which is found by the method of images. Time-dependent contributions to the temperature distribution are conveniently included in the well-tabulated modifiedB essel function KO View full abstract»

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  • Mathematical Model for Pattern Verification

    Publication Year: 1969 , Page(s): 717 - 721
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (503 KB)  

    Pattern verification is mathematically defined, an appropriate decision function derived, and a measure for system evaluation is given. Two basic postulates are set forth to fully define a verification system: each known class is expected, with nonzero probability, to be verified under the correct class label; and the pattern vector extracted during verification should be descriptive of the given ... View full abstract»

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  • Optical Damage to LiNbO3 from GaAs Laser Radiation

    Publication Year: 1969 , Page(s): 722 - 723
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (336 KB)  

    We have observed optical damage to LiNbO3 at room temperature from focused cw GaAs laser radiation at a wavelength of 8450 Å. Visible damage was apparent after a 20-sec exposure corresponding to an energy flux of about 1.2 × 105 J/cm2 and was observed by changes in the diffraction pattern of the crystal. This is believed to be the first report of such... View full abstract»

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  • Recent Papers by IBM Authors

    Publication Year: 1969 , Page(s): 724 - 727
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (454 KB)  

    Reprints of the papers listed here may usually be obtained most eficiently 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; FSD, Federal Systems Division; RES, Research Division; SDD, Systems Development Division and SMD, Systems Manufact... View full abstract»

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  • Patents Recently Issued to IBM Inventors

    Publication Year: 1969 , Page(s): 728 - 729
    Save to Project icon | PDF file iconPDF (295 KB)  
    Freely Available from IEEE
  • Authors

    Publication Year: 1969 , Page(s): 730 - 731
    Save to Project icon | PDF file iconPDF (312 KB)  
    Freely Available from IEEE
  • Contents of previous two issues

    Publication Year: 1969 , Page(s): 732
    Save to Project icon | PDF file iconPDF (198 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