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IBM Journal of Research and Development

Issue 1 • Date Jan. 1985

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Displaying Results 1 - 11 of 11
  • The dynamical equations governing a lubricating film consisting of a gas film overlying a liquid film

    Publication Year: 1985 , Page(s): 2 - 10
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (600 KB)  

    The dynamical equations governing a two-phase lubricating configuration are derived. It is assumed that a gas film overlies a liquid film, both thin enough that the lubrication approximation may be used. The analysis leads to coupled Reynolds equations governing the pressure and the relative thickness of the two films. The coupling, which is determined by continuity of tangential stress across the gas-liquid interface, is considerably simplified if the shear viscosity of the liquid greatly exceeds that of the gas. View full abstract»

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  • The stability of a colloidal suspension of coated magnetic particles in an aqueous solution

    Publication Year: 1985 , Page(s): 11 - 17
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (493 KB)  

    Expressions for the magnetic, electrostatic and van der Waals interactions between isolated magnetic spheres which are coated with an inert material and immersed in an aqueous electrolyte solution are obtained and used to study the stability of a colloid of spheres in an electrolyte. Use is made of a simplified version of the theory of colloid stability of Derjaguin, Landau, Verwey, and Overbeek. We find that the colloidal dispersion becomes more stable as 1) the electrolyte concentration is decreased, 2) the radius of the magnetic spheres is decreased, or 3) the thickness of the inert layer is increased. In order to obtain stability with uncoated spheres, the spheres should have radii of about 5 nm. Such radii are typical of ferrofluids. View full abstract»

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  • A dielectric loss investigation of moisture in epoxy-glass composites

    Publication Year: 1985 , Page(s): 18 - 26
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (669 KB)  

    Dielectric loss has been used to study moisture absorption-desorption equilibria and kinetics in epoxy-glass composites. Measurements were made at a temperature of 90°C and a frequency of 200 Hz to maximize sensitivity to interfacial or Maxwell-Wagner polarization. Exposure to various partial pressures of moisture at that temperature permitted a kinetics analysis from which an estimate was made of the diffusivity of water in the composites. Values of dielectric loss at saturation were used to establish a moisture/dielectric loss calibration at 90°C which can be used to estimate the macroscopic internal moisture content of coupon samples and printed circuit cards and boards. Dielectric loss measurements offer promise as a screening technique for resin-glass coupler development. View full abstract»

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  • Cathodic delamination of methyl methacrylate-based dry film polymers on copper

    Publication Year: 1985 , Page(s): 27 - 36
    Cited by:  Papers (3)  |  Patents (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (884 KB)  

    Studies of the bond degradation between a laminated organic coating and a copper substrate have been carried out using electrochemical techniques. The failure of the bond is attributed to a cathodic reaction which occurs under the coating. The rates of delamination are shown to be affected by delay time after exposure, temperature, applied potential, composition of the electrolyte, and surface abrasion prior to application of the coating. View full abstract»

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  • A development of APL2 syntax

    Publication Year: 1985 , Page(s): 37 - 48
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (819 KB)  

    This paper develops the rules governing the writing of APL2 expressions and discusses the principles that motivated design decisions. View full abstract»

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  • A hardware sort-merge system

    Publication Year: 1985 , Page(s): 49 - 67
    Cited by:  Papers (5)  |  Patents (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1161 KB)  

    The hardware sort-merge system which can sort large files rapidly is proposed. It consists of an initial sorter and a pipelined merger. In the initial sorter, record sorting is divided into two parts: key-pointer sorting and record rearranging. The pipelined merger is composed of several intelligent disks each of which has a simple processor and some buffers. The hardware sort-merge system can sort files of any size by using the pipelined merger repeatedly. The key-pointer sorting circuit in the initial sorter requires only unidirectional connections between neighboring cells, instead of the usual bidirectional ones. The initial sorter can also generate sorted sequences longer than its capacity so that the number of merging passes can be reduced. A new data management scheme is proposed to run all merging passes in a pipelined fashion. View full abstract»

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  • Adaptive clustering algorithm

    Publication Year: 1985 , Page(s): 68 - 72
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    Output data from many types of sensor systems (radar, radar warning, sonar, electro-optical, etc.) must be associated with one or more possible sources based on multiple observations of the data. This paper presents an algorithm that associates data with their source by simultaneous n-dimensional clustering of multiple data observations. The algorithm first orders the observations by successive nearest neighbor, in the n-dimensional Euclidean sense, from a defined starting point. Clusters are then isolated using a method derived from statistical decision theory. The algorithm's primary feature is its ability to perform clustering adaptively without any assumptions about the size, number, or statistical characteristics of the clusters. Since the algorithm was developed for radar warning system processing, a performance comparison with a well-known algorithm used in that field is included. View full abstract»

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  • Novel method for analysis of printed circuit images

    Publication Year: 1985 , Page(s): 73 - 86
    Cited by:  Papers (21)  |  Patents (13)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (955 KB)  

    To keep pace with the trend towards increased circuit integration, printed circuit patterns are becoming denser and more complex. A variety of automated visual inspection methods to detect circuit defects during manufacturing have been proposed. This paper describes a method which is a synthesis of the reference-comparison and the generic-property approaches that exploits their respective strengths and overcomes their respective weaknesses. It is based on the observation that the local geometric and global topological correctness of a printed circuit can be inferred from the correctness of simplified, skeletal versions of the circuit in a test image. These operations can be realized using simple processing elements which are well suited for implementation in hardware. View full abstract»

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  • The effects of wafer to wafer defect density variations on integrated circuit defect and fault distributions

    Publication Year: 1985 , Page(s): 87 - 97
    Cited by:  Papers (63)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (815 KB)  

    A method for modeling the variations in defect levels in circuits produced on modern integrated circuit manufacturing lines is described in this paper. The effects on defect and fault distributions are derived. A deficiency in some previous yield models is eliminated. View full abstract»

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  • Recent papers by IBM authors

    Publication Year: 1985 , Page(s): 98 - 105
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (611 KB)  

    Reprints of the papers listed here may usually be obtained by writing directly to the authors. The authors' IBM divisions or groups are identified as follows: CHQ is Corporate Headquarters; CPD, Communication Products Division; DSD, Data Systems Division; ESD, Entry Systems Division; FED, Field Engineering Division; FSD, Federal Systems Division; GPD, General Products Division; GTD, General Technology Division; IPD, Information Products Division; ISG. Information Systems Group; IS&CG. Information Systems & Communications Group; IS&TG, Information Systems & Technology Group; NAD, National Accounts Division: NMD, National Marketing Division; RES, Research Division; SPD, System Products Division; SRI, Systems Research Institute: and STD, Systems Technology Division. Papers are listed alphabetically by authors. View full abstract»

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  • Recent IBM patents

    Publication Year: 1985 , Page(s): 106 - 108
    Save to Project icon | PDF file iconPDF (224 KB)  
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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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Editor-in-Chief
Clifford A. Pickover
IBM T. J. Watson Research Center