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IBM Journal of Research and Development

Issue 6 • Date Nov. 1975

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Displaying Results 1 - 15 of 15
  • Theory of Liquid Ink Development in Electrophotography

    Publication Year: 1975 , Page(s): 514 - 522
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    When an electric field is present across two different fluid dielectrics having a common plane boundary, some disturbances in the interfacial boundary are found to grow in time. The liquid ink development process is viewed as the result of varying instability of the oil-ink interface as a function of the differing field gradient in light and dark areas of the exposed image. In an analysis of the disturbances into normal modes, the theory relates the effects upon instability due to potential difference across the oil, the surface tension, the respective viscosities of the oil and the ink, and the finite thicknesses of the oil, ink, and the photoconductor layer. The threshold potential difference for the onset of instability is also given. View full abstract»

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  • Multiconic Surfaces

    Publication Year: 1975 , Page(s): 523 - 529
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (472 KB)  

    Multiconic surfaces are a generalization of the type of surface called polyconic in numerical control of machine tools. The general theory is developed in this paper using a new parametrization. In the original form there was a problem as to whether or not a point that satisfies surface equations actually belonged to the intended surface. This difficulty is removed by the new technique. View full abstract»

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  • Threshold Voltage Characteristics of Double-boron-implanted Enhancement-mode MOSFETs

    Publication Year: 1975 , Page(s): 530 - 538
    Cited by:  Papers (15)  |  Patents (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (615 KB)  

    Threshold voltage characteristics are presented for a double boron-ion-implanted n-channel enhancement MOSFET device for high speed logic circuit applications. A 15-Ω-cm high resistivity p-type (100) substrate was used to achieve low junction capacitance and low threshold substrate sensitivity. A shallow boron implant was used to raise the threshold voltage, and a second, deeper, boron implant was used to increase the punch-through voltage between the source and the drain. This design is especially beneficial for short channel devices, while maintaining the low junction capacitance and low threshold substrate sensitivity of the high resistivity substrate. A one-dimensional analysis was performed to predict the effects of ion implantation dose and energy on the device characteristics, and a quasi two-dimensional analysis was used to account for the short channel effect. The calculated results agree well with the behavior of experimental devices fabricated in the laboratory. View full abstract»

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  • Computation of Incident Solar Energy

    Publication Year: 1975 , Page(s): 539 - 549
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (599 KB)  

    Computations of the daily and annual totals of the solar energy incident upon south-facing tilted flat surfaces were carried out for several cloudfree atmospheric models after taking into account, somewhat arbitrarily, the contribution due to sky radiation and that due to radiation reflected by the ground. Representative variations of these quantities are discussed as a function of several parameters such as geographical latitude of the location, tilt angle of the surface, atmospheric transmission characteristics, sky-radiation contribution, and ground reflectivity. View full abstract»

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  • Model for Interactive Data Base Reference String

    Publication Year: 1975 , Page(s): 550 - 556
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (487 KB)  

    A particularly simple Markov chain model for a reference string is described. The model, which is only slightly more complicated than the independent reference model, generates strings that have a locality property and that have a specified probability distribution of references over pages. Expressions are obtained for expected working-set size and expected working-set miss ratio. The model is used in an examination of the effect of grouping pages into blocks and in a discussion of the problem of evaluating the effect of changes in the size of the data base. Predictions of the model are shown to agree closely with observations of a string of data base references generated by an interactive data base system having a large number of concurrent users. View full abstract»

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  • HEME: A Self-Improving Computer Program for Diagnosis-Oriented Analysis of Hematologic Diseases

    Publication Year: 1975 , Page(s): 557 - 564
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (481 KB)  

    HEME, a computer program for diagnosis-oriented analysis of hematologic diseases, accepts as input information about a patient and provides as output an ordered list of suggested diagnoses, an analysis of the logic behind these diagnoses, and a list of tests relevant to these diagnoses and not yet performed. The decision algorithm is based on Bayes’ Theorem. Each disease in the system is individually analyzed, and the probability that the patient has the disease vs the probability that he does not is calculated. Bayesian methods of statistical inference are utilized in that the prior probabilities of the diseases and the probabilities of findings in given diseases were initially estimated from the judgment of experienced hematologists with the intention that they be modified automatically as data are accumulated. This program is intended for use in teaching hematology, as an aid to diagnosis, and as a means for studying the diagnostic process. View full abstract»

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  • Modified Nodal Approach to DC Network Sensitivity Computation

    Publication Year: 1975 , Page(s): 565 - 574
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (510 KB)  

    Programming techniques are presented for computing dc sensitivity vectors of nonlinear electronic circuits. The modified nodal approach is used as the method of formulation for the circuit equations, in which multiple performance objectives can be accommodated. Numerical examples illustrate some of the techniques discussed. View full abstract»

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  • Mathematical Construct for Program Reorganization

    Publication Year: 1975 , Page(s): 575 - 581
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (382 KB)  

    A mathematical formalism is described through which a program is given a symbolic representation and, with the application of several basic formulas, may be transformed into an equivalent representation giving rise to a reorganized program. Examples are given in which programs are simplified (e.g., code is reduced) or reorganized into a structured form. In effect a mathematics is described that applies to programs in much the same manner as Boolean algebra applies to switching circuits. View full abstract»

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  • On Some Relations between the Laplace and Mellin Transforms

    Publication Year: 1975 , Page(s): 582 - 586
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (388 KB)  

    Several earlier papers have applied some identities relating the Laplace and Mellin transforms; this note develops certain such identities, achieving greater generality and rigor. Specifically each of these transforms is expressed as a contour integral involving the other, and an expansion of the Laplace transform is derived in terms of the functions (s·d/ds)n(1+s)−1 with coefficients defined by the Mellin transform. View full abstract»

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  • Amorphous GdCoCr Films for Bubble Domain Applications

    Publication Year: 1975 , Page(s): 587 - 590
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (310 KB)  

    Amorphous GdCoCr films of various composition ratios made by rf bias sputtering are investigated for their applicability as bubble domain supporting materials. Film compositions around Gd0.13Co0.65Cr0.22 have temperature-insensitive magnetizations between 240 K and 350 K with Tcomp nearly 120 K and Tc nearly 630 K. Reduction of the Cr content from 21.8 to 20.3 at. percent causes an increase of the magnetization by a factor of three. Thermal cycling of these films between 290 K and 570 K does not change the magnetization noticeably, nor does annealing for up to six days at 520 K. The films are found to be very susceptible to contamination by the residual oxygen present in the vacuum chamber during sputtering. Films contaminated with 3 to 13 at. percent oxygen have coercivities around 800 A/m (10 Oe), whereas films which were oxygen-free according to microprobe investigations show coercivities less than 80 A/m (1 Oe). View full abstract»

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  • Effect of Submicrometer Transducer Spacing on the Readback Signal in Saturation Recording

    Publication Year: 1975 , Page(s): 591 - 596
    Cited by:  Papers (10)  |  Patents (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (438 KB)  

    Experimental results for frequency response and halfpulse width of digital recording signals have been obtained for submicrometer transducer spacings, for the case of a flexible disk flying in close proximity to a rigidly mounted conventional ferrite recording head. Using optical flying heights rather than an “effective spacing,” together with a modification of the Williams-Comstock write-process slope criterion, we have obtained excellent agreement between experimental results and theoretical predictions. This suggests that the notion of effective spacing can be avoided. View full abstract»

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  • Recent Papers by IBM Authors

    Publication Year: 1975 , Page(s): 597 - 601
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (440 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 Division; and SPD, System Products Division. Papers are listed alphabetically by name of journal. View full abstract»

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  • Recent IBM Patents

    Publication Year: 1975 , Page(s): 602
    Save to Project icon | PDF file iconPDF (177 KB)  
    Freely Available from IEEE
  • Authors

    Publication Year: 1975 , Page(s): 603 - 605
    Save to Project icon | PDF file iconPDF (320 KB)  
    Freely Available from IEEE
  • Author Index for Papers in Volume 19

    Publication Year: 1975 , Page(s): 606 - 608
    Save to Project icon | PDF file iconPDF (339 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