Proceedings of the IEEE

Issue 3 • March 1968

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Displaying Results 1 - 25 of 61
  • [Front cover and table of contents]

    Publication Year: 1968, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1968, Page(s): 247
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    Freely Available from IEEE
  • Covariant descriptions of bianisotropic media

    Publication Year: 1968, Page(s):248 - 251
    Cited by:  Papers (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (343 KB)

    It is suggested that a medium it which the field vectors D and H depend on both E and B but are parallel to neither be described as bianisotropic. A moving medium, even if it is isotropic it its rest frame, then appears bianisotropic to the laboratory observer. This paper gives the transformation formulas for the constitutive relations of a bianisotropic medium between inertial frames in relative ... View full abstract»

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  • A general mechanical model for |f|αspectral density random noise with special reference to flicker noise 1/|f|

    Publication Year: 1968, Page(s):251 - 258
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    Any class of reasonable time-dependent perturbations occurring at random, under certain internal contraints, generates random noise having a spectral density varying as |f|αover an arbitrarily large range of spectral frequency f only for - 2 ≤ α ≤ 0. A class is the set of all perturbations which are equivalent under some individual indenpendent scaling of amplitute... View full abstract»

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  • Signal processing in a nonperiodically time-varying magnetoelastic medium

    Publication Year: 1968, Page(s):258 - 272
    Cited by:  Papers (40)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2528 KB)

    Wave propagation in a nonperiodically time-varying medium provides a means for realizing in simple physical structures a variety of signal-processing operations, such as frequency translation and coding, variable delay recall, gating, time-scale stretching or shrinking, and time reversal. The use of low-velocity modes, such as acoustic, spin, or magnetoelastic waves in solids, reduces the length o... View full abstract»

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  • Analysis of two-port magnetoelastic delay lines as pulse-compression filters

    Publication Year: 1968, Page(s):273 - 285
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1239 KB)

    A critical review is given of the properties of magnetoelastic delay lines, employing yttrium iron garnet (YIG) and having physically distinct input and output ports. Attention is directed to two configurations involving the materials YIG and yttrium alumium garnet (YAG), namely the YAG(nλB/4)-YIG-YAG(n/4) employing YAG quarter-wave plates λB/4, and the YIG-YAG-YIG ... View full abstract»

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  • Image-storage panels based on field-effect control of conductivity

    Publication Year: 1968, Page(s):285 - 295
    Cited by:  Papers (2)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1644 KB)

    Using the principle of field-effect conductivity control, a new method of image storage has been demonstrated. Based on this a new type of solid-state image panel has been developed capable of producing a stored luminescent image. This employs an electroluminescent powder layer for generation of the output image and a ZnO powder layer for control and storage purposes. In operation the exposed ZnO ... View full abstract»

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  • Ion implantation in semiconductors—Part I: Range distribution theory and experiments

    Publication Year: 1968, Page(s):295 - 319
    Cited by:  Papers (145)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2838 KB)

    Ion implantation in semiconductors provides a doping technique with several potential advantages over more conventional doping methods. Among the most important of these are: 1) the ability to introduce into a variety of substrates precise amounts of nearly any impurity element desired; 2) the ability to control doping profiles in three dimensions by modulating the energy, current, and position of... View full abstract»

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  • On the upper bound of the probability of error of a linear pattern classifier for probabilistic pattern classes

    Publication Year: 1968, Page(s):321 - 322
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (215 KB)

    Given a set of sample patterns for two pattern classes, some simple expressions for the upper bound of the probability of error for a linear pattern classifier and the optimal linear discriminant function minimizing the upper bound are obtained. Using these results, if the tolerable probability of error of classifying patterns in the two pattern classes is not smaller than this upper bound, not on... View full abstract»

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  • Crossed-field, free carrier, far infrared modulation in germanium

    Publication Year: 1968, Page(s):322 - 323
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (218 KB)

    We report the first observation of crossed-field, free carrier, far infrared modulation in near intrinsic, room temperature, single-crystal germanium. A modulation efficiency of one percent was obtained in the 8- to 14-µ region when the sample was placed in a static magnetic field of 3000 gauss and an alternating electric field of 3 V/cm. View full abstract»

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  • A note concerning the duals of nonplanar networks

    Publication Year: 1968, Page(s):324 - 325
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (218 KB)

    In 1962 Erdei presented a method of constructing dual networks (as defined by Bloch) for nonplanar networks without the use of ideal transformers. In this letter we bring up a case for discussion. The difficulty which we encounter in this case indicates that the basis of Erdei's method needs a careful reexamination. View full abstract»

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  • Electroluminescent source with luminance greater than 6 × 109cd/m2

    Publication Year: 1968, Page(s): 324
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (129 KB)

    GaAs1-xPxinjection lasers were found to emit 6440 Å radiation at an average output level of 2 × 104W/cm2from each of the two Fabry-Perot facets. View full abstract»

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  • A sampled computer-generated binary hologram

    Publication Year: 1968, Page(s):325 - 327
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (398 KB)

    A simple way of recording computer-generated holograms is reported. It involves recording the sign of the amplitude (hence the word binary) on computer printer paper. Also the resolution attained during reconstruction of a hologram is discussed and compared with the theoretical limit. View full abstract»

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  • Design of a high-frequency notch filter

    Publication Year: 1968, Page(s): 327
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (71 KB)

    Design equations for a high-frequency notch filter are presented. The filter makes use of a hybrid coil for decoupling input from output. The notch is obtained from a bridge-type balance, and can be made quite narrow. View full abstract»

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  • A resolution of Penfield's paradox

    Publication Year: 1968, Page(s): 328
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (135 KB)

    The theoretical possibility of using the thermal noise from a resistor to drive a motor with armature and field in series is discussed. It is shown that the armature produces thermal noise, thereby establishing a mechanism for thermal equilibrium between the motor and the resistor. View full abstract»

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  • Enforcing causality in numerical solutions of Maxwell's equations

    Publication Year: 1968, Page(s): 329
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    Maxwell's equations in differential form do not distinguish between advanced and retarded solutions. Unless special precautions are taken, a point-by-point numerical integration, based on a finite-difference analog of Maxwell's equations, will lead to a mixture of advanced and retarded fields, inadmissible on physical grounds. The causality requirement can be satisfied if the Maxwell theory is exp... View full abstract»

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  • Dynamic range of photochromic memories

    Publication Year: 1968, Page(s):329 - 330
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (265 KB)

    Dynamic range definitions for conventional photographic films emphasize the primary noise mechanisms of such films, namely grain noise. Dynamic range is redefined and noise mechanisms are discussed for photochromic and other grainless films. Measurements indicate peak signal-to-noise ratios in excess of 60 dB for photochromic memories. View full abstract»

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  • Gunn-type oscillations in Ge, GaAs, and other materials

    Publication Year: 1968, Page(s):331 - 332
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (207 KB)

    Minimum nL-products for oscillations to occur similar to the Gunn effect in GaAs have been calculated for a broad range of materials parameters, including effects of variation of dc electric field and drift velocity across the sample. The minimum nL-product is approximately inversely proportional to high-field negative mobility. View full abstract»

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  • Equalizer design with integrated envelope-error criterion

    Publication Year: 1968, Page(s): 331
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (110 KB)

    Results concerning the design of an equalizer with an integrated envelope-error criterion using the known IF optimum equalizer are presented. The upper bound of envelope error is shown to be twice the IF error. The necessary and sufficient condition for the optimum equalizer among a class of equalizers is derived. View full abstract»

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  • Exotic effects?

    Publication Year: 1968, Page(s):332 - 333
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    First Page of the Article
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  • Self-locking of transverse higher-order modes in a He-Ne laser

    Publication Year: 1968, Page(s):333 - 335
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    Self-locking of TEM10+ TEM01modes was observed in a He-Ne laser. The laser output was modulated with a frequency difference between two transverse modes. In this case two longitudinal modes operated, and the combination tone due to three of the modes pulled in the fourth. View full abstract»

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  • Schottky emission in thin-film diodes containing manganese

    Publication Year: 1968, Page(s):335 - 336
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (173 KB)

    Temperature-dependent I-V characteristics have been observed in thin-film diodes consisting of Al, Mn, and Pb. Straight-line plots of In I - V1/2, d in I/dV1/2- 1/T, and In (I/T2)-1/T indicate that Schottky emission is taking place. A diode was tested for 98 hours without barrier breakdown. View full abstract»

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  • Sheet Gunn oscillator and thermal considerations

    Publication Year: 1968, Page(s):336 - 338
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    CW operation of a sheet Gunn oscillator is reported. The advantages of the sheet structure for CW operation are pointed out. Also, curves for determining the temperture of the device at thresold are presented as a function of the device parameters. View full abstract»

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  • Image recording by particle orientation

    Publication Year: 1968, Page(s):338 - 339
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (382 KB)

    Using a thermolptastic film containing flake-like colloidal particles an optical transparency can be produced by heating the film while applying a pattern of electric fields to locally orient the particles. These fields can be controlled by an adjacent photoconductive layer, allowing an input optical image to be recorded. View full abstract»

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  • Two-port amplifiers using gallium arsenide as the active element

    Publication Year: 1968, Page(s): 339
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (109 KB)

    Two-port transmission amplifiers using gallium arsenide as the active element have been designed and built. These are capable of providing more than 25 dB gain in the vicinity of 2 GHz with a saturation power of more than 1 watt. Reciprocal operation can be obtained and the degree of reciprocity controlled by a relatively simple adjustment of the microwave circuit. View full abstract»

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North Carolina State University