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IBM Journal of Research and Development

Issue 3 • Date May 1971

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Displaying Results 1 - 11 of 11
  • Numerical Method for Computing Nonlinear, Time Dependent, Buoyant Circulation of Air in Rooms

    Publication Year: 1971, Page(s):186 - 196
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (897 KB)

    A method is described which solves the dynamic equations for air circulation at Grashof numbers that are in the range of environmental temperatures of rooms. Previous two-dimensional computation techniques were limited to G ≈ 105 but environmental conditions require G ≈ 1012. The higher Grashof numbers become calculable through the design of a mixed system of no... View full abstract»

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  • Random-walk Model of Stream Network Development

    Publication Year: 1971, Page(s):197 - 203
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (556 KB)

    A random-walk, headward-growth model of stream network development in a region of uniform lithology and uniform slope is proposed. The principal difference from previous models is that the probability of growth is made dependent on the area contributing runoff to the stream tip. Two versions of the model have been studied in detail and shown to give satisfactory results. A major advantage is that ... View full abstract»

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  • Automatic Pulse Parameter Determination with the Computer Augmented Oscilloscope System

    Publication Year: 1971, Page(s):204 - 212
    Cited by:  Papers (2)  |  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (704 KB)

    The Computer Augmented Oscilloscope System (CAOS) is a special computer terminal facility intended for laboratory experiments involving waveforms and their interpretation. The system provides digital acquisition of waveform data, system control and calibration, data analysis, and graphic and alphanumeric display. Pulse parameter determination requires the use of all system capabilities since a) ha... View full abstract»

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  • A Quasi-steady-state Analysis for the Electrophotographic Discharge Process

    Publication Year: 1971, Page(s):213 - 221
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (708 KB)

    A description of the electrophotographic discharge process is presented for a homogeneous photoconductor characterized by constant free-carrier lifetimes and trapping times. The physical model is described by a set of one-dimensional nonlinear differential equations with appropriate boundary conditions. It is shown that a quasi-steady-state approximation can be derived which is valid for most of t... View full abstract»

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  • Interaction Potential between Li+ and HD: Region for Rotational Excitation Cross Sections

    Publication Year: 1971, Page(s):222 - 229
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (660 KB)

    The interaction potential between Li+ and HD (with internuclear separation fixed at 1.4 a.u.) was determined by two different methods using the results of a recent self-consistent-field calculation of the potential energy surface for Li+-H2. In one method, Li+-HD interaction energies were obtained utilizing an analytical representation of the Li... View full abstract»

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  • A Design Study of Ultrasonic Bonding Tips

    Publication Year: 1971, Page(s):230 - 235
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (508 KB)

    The standing wave on ultrasonic bonding tips and the tendency of the lower end to fold back upon itself, termed “lug-down,” have been measured under actual bonding conditions. These phenomena have also been modeled on a computer. Lug-down can be a major contributor to bonding failures in designs having an overly slim tip. One definition of a “bonding failure” is the pro... View full abstract»

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  • Heat-transfer Calculations at the Tape-head Interface of a Computer Tape Drive

    Publication Year: 1971, Page(s):236 - 241
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (531 KB)

    Frictional heat generation can develop localized high temperatures at the tape-head interface of a computer tape drive and can seriously affect the performance of the drive. Using standard heat transfer theory, we calculated the magnitude of this “hot spotting” to be of the order of 21°C for an IBM 2400 series tape drive. In general, it is almost impossible to accurately measu... View full abstract»

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  • The Common-core Filter as an Electromagnetic Interference-suppression Device

    Publication Year: 1971, Page(s):242 - 244
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (346 KB)

    Though everyone is daily made aware of the existence of electromagnetic interference (as when one drives an automobile near a faulty neon sign and hears a loud “buzz” on the car radio, or when one uses a television receiver while an electric mixer is running nearby and the interference from that appliance obliterates the picture) it is not the most frequently cited form of pollution.... View full abstract»

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  • Recent Papers by IBM Authors

    Publication Year: 1971, Page(s):245 - 248
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (470 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; RES, Research Divi... View full abstract»

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  • Patents Recently Issued to IBM Inventors

    Publication Year: 1971, Page(s):249 - 251
    IEEE is not the copyright holder of this material | PDF file iconPDF (392 KB)
    Freely Available from IEEE
  • Authors

    Publication Year: 1971, Page(s):252 - 256
    IEEE is not the copyright holder of this material | PDF file iconPDF (317 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