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Proceedings of the IEEE

Issue 9 • Date Sept. 1975

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Displaying Results 1 - 25 of 28
  • [Front cover and table of contents]

    Publication Year: 1975, Page(s): c1
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  • Scanning the issue

    Publication Year: 1975, Page(s):1267 - 1268
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  • Applications of lasers to biology and medicine

    Publication Year: 1975, Page(s):1269 - 1278
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1295 KB)

    The applications of lasers to medicine and biology have grown very rapidly over the last decade and now include a wide variety of activities. These range from eye surgery through holographic microscopy and pattern recognition to the sealing of dental enamel. This paper reviews some of the fundamentals which underlie these applications and briefly reviews a few of the more significant applications ... View full abstract»

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  • The protection of information in computer systems

    Publication Year: 1975, Page(s):1278 - 1308
    Cited by:  Papers (435)  |  Patents (56)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3835 KB)

    This tutorial paper explores the mechanics of protecting computer-stored information from unauthorized use or modification. It concentrates on those architectural structures-whether hardware or software-that are necessary to support information protection. The paper develops in three main sections. Section I describes desired functions, design principles, and examples of elementary protection and ... View full abstract»

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  • The role of rain in satellite communications

    Publication Year: 1975, Page(s):1308 - 1331
    Cited by:  Papers (99)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2412 KB)

    The most fundamental obstacle encountered in design of satellite communication systems at frequencies above 10 GHz is attenuation by rain. The microwave power radiated toward an earth station, being limited by factors such as available primary power and size of antenna on the satellite, is insufficient, with present technology, to overcome the large attenuation produced by intense rain cells on th... View full abstract»

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  • Models of hearing

    Publication Year: 1975, Page(s):1332 - 1350
    Cited by:  Papers (22)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2416 KB)

    People have thought about their ears (and those of certain animals) for a long time. Intelligent speculation, supplemented by experiment (and vice versa), has brought us a long way toward understanding how the ear works-from subtle monaural phase effects (verboten by Ohm's law of acoustics) to expansive binaural stereophony (hailed by almost everyone). Much of this new gained knowledge, some of it... View full abstract»

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  • A fast Gaussian method for Fourier transform evaluation

    Publication Year: 1975, Page(s):1353 - 1354
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (273 KB)

    A Gaussian method for fast evaluation of approximations to Fourier integral transforms is presented. This method is faster than the FFT for transforms of functions that require considerable computer time to compute. It is especially useful when transforms of high accuracy are needed. View full abstract»

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  • Comment on the angular resolution of radar

    Publication Year: 1975, Page(s):1354 - 1356
    Cited by:  Papers (1)
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  • Some comments on the application of microwave radiometry to biological systems

    Publication Year: 1975, Page(s):1356 - 1357
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  • On the reduction of matrix functions

    Publication Year: 1975, Page(s):1357 - 1358
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (226 KB)

    Straightforward reduction of matrix functions without explicit use of the Lagrange-Sylvester (LS) theorem and of the characteristic roots is achieved by expansions in terms of Lucas polynomials. Use of the LS theorem within the framework of the Lucas polynomial method and, furthermore, of circulant matrices leads to substantial simplifications. View full abstract»

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  • An optical processor for radio pulses from an antenna array

    Publication Year: 1975, Page(s):1358 - 1360
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (367 KB)

    A coherent optical method of processing pulsed radio signals received by a planar antenna array is described. The output is the two-dimensional optical image of the brightness distribution of the radio sky. Experimental results for a 4 × 4 array are presented. View full abstract»

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  • A new edge-emitting (AlGa)As heterojunction LED for fiber-optic communications

    Publication Year: 1975, Page(s):1360 - 1361
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (243 KB)

    A new edge-emitting structure designed for fiber-optical communications, in which the active area is limited to the edge of the chip, is described. Significant improvements in the quantum efficiency compared to previous emitting structures are obtained. A power emission of 2 mW for one edge is obtained at a current of 250 mA (λ = 8000 Å). View full abstract»

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  • High-frequency signal recording on film using (AlGa)As CW injection lasers

    Publication Year: 1975, Page(s):1361 - 1362
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (466 KB)

    CW injection lasers have demonstrated excellent performance when used in a wide-band film recorder. These lasers have been internally modulated from 1 to 200 MHz (±2 dB) and film recordings of signal frequencies up to 100 MHz (160 cycles/mm) have been made. View full abstract»

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  • Insertion loss of mismatched filters

    Publication Year: 1975, Page(s):1362 - 1363
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (365 KB)

    The design of power line filters is difficult because the actual impedances of the equipment to be suppressed and of the power lines are often unknown. By means of simple geometric considerations it is easy to calculate the maximum and minimum insertion losses which give a more realistic characterization of power line filter performances. View full abstract»

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  • A broad-band negative conductance GaAs TED

    Publication Year: 1975, Page(s):1364 - 1365
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (227 KB)

    Small-signal negative conductances from 5 to 17 GHz in both voltage polarities are reported for CW-operated 10-µm supercritically doped n+nn+GaAs transferred electron devices. The conceptually different behavior in the two polarities for the frequency dependence of the negative conductance is interpreated by means of computer simulations, and the stabilizing mechanisms i... View full abstract»

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  • A new type of digital frequency multiplier

    Publication Year: 1975, Page(s):1365 - 1366
    Cited by:  Papers (6)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (217 KB)

    A new technique for frequency multiplication using digital methods is described. The method is primarily useful for low-frequency multiplication and generates equally spaced pulses, although there is a small error due to truncation. View full abstract»

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  • Obtaining digital signals for poisson filtering from periodic samples

    Publication Year: 1975, Page(s):1366 - 1367
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (246 KB)

    To facilitate using the digital signals generated by Poisson transformation to represent analog filtering, it is shown that digital signals for use in this type of simulation can be obtained from periodic samples by processing them through a chain of first-order recursive filters. View full abstract»

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  • Millimeter-wave IMPATT diodes with improved efficiency by using ion-implanted ohmic contact

    Publication Year: 1975, Page(s):1367 - 1368
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (249 KB)

    The application of arsenic ion-implantation to the reduction of the contact resistance in the n+substrate of millimeter-wave IMPATT diodes is discussed. Single-drift-region-type IMPATT fabricated with these techniques exhibited output powers ∼600 mW at ΔTj = 200°C with 8.7-percent conversion efficiencies over frequency range of 52 to 60 GHz. View full abstract»

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  • Propagation of electromagnetic waves in rotating systems

    Publication Year: 1975, Page(s):1368 - 1369
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    With the aid of geometrical-optics approximation, the problem of electromagnetic-wave propagation in rotating systems is discussed on the basis of Maxwell's equations and the constitutive relations in rotating systems derived from the phenomenological viewpoint. View full abstract»

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  • Binary windows for the discrete Fourier transform

    Publication Year: 1975, Page(s):1370 - 1371
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (266 KB)

    An efficient structure is suggested for the frequency-domain windowing of discrete Fourier transforms. In this scheme, multiplications are replaced by shifts in the position of the binary point. Three new window functions are described which can be realized by the suggested structure. View full abstract»

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  • Full-band staggered-gain Gunn-effect amplification in Ka band

    Publication Year: 1975, Page(s):1371 - 1373
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (367 KB)

    The feasibility of full-band low-noise instantaneous amplification in Ka band has been demonstrated using a staggered-gain amplifier technique. A simplified analysis of the overall gain variations in this two-stage amplifier is used to calculate the minimum isolation levels needed to meet a maximum allowable ripple. Using this technique, 10 ± 2.2-dB gain has been obtained from 26.6-39.4 GHz. View full abstract»

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  • Ignitability of anechoic chamber foam by electric currents

    Publication Year: 1975, Page(s): 1371
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    Anechoic chamber foams are easily ignited by passage of current through them. Two distinct ignition processes can be observed. The first is a contact fire that results when two sharp points which are at a potential difference of more than 100 V touch the conducting foam. The second is an I2R heating of the interior of the foam which begins with smoldering, then a glowing chunk of foam i... View full abstract»

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  • Resistive circuit theory

    Publication Year: 1975, Page(s): 1374
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  • Random differential equations in science and engineering

    Publication Year: 1975, Page(s):1374 - 1375
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  • Optical information processing and holography [Book review]

    Publication Year: 1975, Page(s): 1375
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    Freely Available from IEEE

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H. Joel Trussell
North Carolina State University