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IBM Journal of Research and Development

Issue 3 • May 1979

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Displaying Results 1 - 12 of 12
  • Simulation of a Moving Bed Gasifier for a Western Coal

    Publication Year: 1979, Page(s):240 - 252
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (935 KB)

    This paper describes an adiabatic steady state plug flow model for a moving bed coal gasifier with gas-solid heat transfer. The model considers 17 solid stream components, 10 gas stream components and 17 reactions. The kinetic and thermodynamic parameters were derived for a Wyoming subbituminous coal. Examples of calculated results are given. View full abstract»

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  • The Analysis and Comparison of Actual to Predicted Collector Array Performances

    Publication Year: 1979, Page(s):253 - 269
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1071 KB)

    The Hottel-Whillier-Bliss (HWB) equation has been the standard tool for the evaluation of collector thermal performance for four decades. This paper presents a technique that applies the criteria of ASHRAE Standard 93-77 to the determination of the HWB equation coefficients from field-derived data. Results of the analysis of a sample collector array illustrate the technique. Actual dynamic perform... View full abstract»

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  • Solar-Grade Silicon by Directional Solidification in Carbon Crucibles

    Publication Year: 1979, Page(s):270 - 277
    Cited by:  Papers (4)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (729 KB)

    Directional solidification of silicon in carbon crucibles was achieved by using two variations of the Bridgman-Stockbarger method. One was a static technique wherein liquid silicon in a carbon crucible was positioned in a temperature gradient of about 35°C/cm, with the highest temperature at the top of the crucible. Solidification was achieved by lowering the system temperature at a rate of... View full abstract»

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  • Encapsulation of Radioactive Noble Gas Waste in Amorphous Alloy

    Publication Year: 1979, Page(s):278 - 285
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (688 KB)

    Public demand for the containment and safe storage of radioactive waste materials has caused the U.S. Government to require that, beginning in January 1983, most of the 85Kr, which until now has been vented to the atmosphere during the reprocessing of nuclear fission fuel rods, will have to be captured and retained for several decades. The cost of accomplishing this with present compres... View full abstract»

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  • An Access Specification Language for a Relational Data Base System

    Publication Year: 1979, Page(s):286 - 298
    Cited by:  Papers (2)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (835 KB)

    We address the problem of executing high level language queries submitted to a relational data base system. As a step in the process of constructing an “efficient” compiler for a high level language we suggest the elaboration of an intermediate level language acting as a target language for the optimizer part of the compiler. This language may be conceived as one of several levels in... View full abstract»

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  • Transform Techniques for Error Control Codes

    Publication Year: 1979, Page(s):299 - 315
    Cited by:  Papers (65)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1222 KB)

    By using the theory of finite field Fourier transforms, the subject of error control codes is described in a language familiar to the field of signal processing. The many important uses of spectral techniques in error control are summarized. Many classes of linear codes are given a spectral interpretation and some new codes are described. Several alternative encoder/decoder schemes are described b... View full abstract»

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  • Electrodes with Covalently Attached Monolayers

    Publication Year: 1979, Page(s):316 - 329
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (953 KB)

    We have used cyclic and second-harmonic ac voltammetry to study solution and solid state electrochemical reactions on metal oxide surfaces chemically modified with silyl derivatives of the type SnO2/Si(CH2)3NH(CH2)xNR1 R2. The R groups studied include pyrazoline derivatives, tetrathiafulvalene, and ferrocene. Electrode ef... View full abstract»

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  • On the Zigzag Form of Charged Domain Walls

    Publication Year: 1979, Page(s):330 - 338
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (713 KB)

    Unusual domain walls have been found in ferrofluid patterns on thin film materials with low magnetization that is in or near the plane of the film. These walls carry a net magnetic charge and are characteristically kinked in a regular manner to form a zigzag. A simple account is given of the energetics of such walls whose form follows from a compromise between magnetostatic terms and the energy of... View full abstract»

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  • Probabilistic PERT

    Publication Year: 1979, Page(s):339 - 347
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (722 KB)

    A solution is offered to the problem of determining a probability distribution for the length of the longest path from source (start) to sink (finish) in an arbitrary PERT network (directed acyclic graph), as well as determining associated probabilities that the various paths are critical (“bottleneck probabilities”). It is assumed that the durations of delays encountered at a node a... View full abstract»

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  • Recent papers by IBM authors

    Publication Year: 1979, Page(s):348 - 354
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (647 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: CHQ is Corporate Headquarters; DPD, Data Processing Division; DSD, Data Systems Division; FED, Field Engineering Division; FSD, Federal Systems Division; GPD, General Products Division; GSD, General Systems Division; OPD, Ofice Products Division; RES,... View full abstract»

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  • Recent IBM patents

    Publication Year: 1979, Page(s): 355
    IEEE is not the copyright holder of this material | PDF file iconPDF (129 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1979, Page(s):356 - 358
    IEEE is not the copyright holder of this material | PDF file iconPDF (265 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