Proceedings of the IEEE

Issue 7 • July 1985

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Displaying Results 1 - 18 of 18
  • [Front cover and table of contents]

    Publication Year: 1985, Page(s): c1
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  • Editorial: Proceedings Letters

    Publication Year: 1985, Page(s): 1155
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  • The special section on electronic instrumentation for the sciences: Historical perspectives

    Publication Year: 1985, Page(s):1156 - 1158
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  • Scanning the issue

    Publication Year: 1985, Page(s): 1156
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  • Bounds on estimating the acoustic attenuation of small tissue regions from reflected ultrasound

    Publication Year: 1985, Page(s):1159 - 1168
    Cited by:  Papers (44)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (911 KB)

    The acoustic attenuation coefficient of most soft biological tissues has an approximately linear-with-frequency attenuation characteristic. The slope of the attenuation coefficient with frequency, denoted by β, has been observed to vary with the severity of liver disease. Two approaches for estimating the β value from reflected ultrasound signals are examined: the spectral-difference app... View full abstract»

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  • Steeple building at Stanford: Electrical engineering, physics, and microwave research

    Publication Year: 1985, Page(s):1169 - 1180
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1531 KB)

    Stanford University's microwave research program offers an interesting perspective on the interaction of electrical engineering and physics. Beginning with the invention of the klystron by William Hansen and the Varian brothers in the 1930s, Stanford's departments of physics and electrical engineering worked together closely in exploring the science and technology of microwaves. On the engineering... View full abstract»

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  • Atomichron®: The atomic clock from concept to commercial product

    Publication Year: 1985, Page(s):1181 - 1204
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3307 KB)

    The first half of this paper (Sections I-III) gives an overview of the development of atomic clocks from the earliest suggestions that atoms could provide superlative frequency and time standards to the realization of a cesium-beam device (1955) capable of assuming this role in a national standards laboratory. The second half (Sections IV and V) describes in considerably greater detail J. R. Zacha... View full abstract»

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  • Electronics in astronomy: Early applications of the photoelectric cell and photomultiplier for studies of point-source celestial phenomena

    Publication Year: 1985, Page(s):1205 - 1220
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2419 KB)

    Photoelectric detection devices have been in use in astronomy for over 80 years, but gained wide popularity and utility only since World War II. After the turn of the Century, early photoconductive selenium cells were quickly replaced by photoemissive cells utilizing potassium hydride photocathodes, and then by photoelectric photomultipliers amplified by vacuum tube dc circuits. As the reliability... View full abstract»

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  • Replacing a technology: The large space telescope and CCDs

    Publication Year: 1985, Page(s):1221 - 1235
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1868 KB)

    The Hubble Space Telescope is due to be launched in 1986. It is certainly the chief space astronomy initiative of the 1980s, perhaps of the late twentieth century. It is to carry six scientific instruments, and in this paper we investigate the debate on the choice of detectors for what was seen as the chief instrument during the project definition phase, the so-called wide-field camera. In the end... View full abstract»

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  • A T-matrix approach for EM scattering by a perfectly conducting periodic surface

    Publication Year: 1985, Page(s):1238 - 1239
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (189 KB)

    The novel use of a Fourier exponential representation of the field induced on a perfectly conducting periodic surface is shown to yield a T-matrix which is numerically stable for deeply corrugated surfaces. Whereas the Rayleigh hypothesis limited the maximum slope of the surface to less than 0.448 in Waterman's original T-matrix scheme [1], our T-matrix is applicable even when the maximum slopes a... View full abstract»

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  • Voltage-controlled SAW oscillator on temperature-stable quartz substrate

    Publication Year: 1985, Page(s):1240 - 1241
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (194 KB)

    The frequency of a surface acoustic wave (SAW) oscillator fabricated on the temperature-stable X 33 orientation of quartz is found to vary linearily with an applied bias voltage. The fractional frequency change per unit biasing field has a value of 9.5 × 10-12m/V. Fractional frequency changes greater than 200 ppm have been obtained. View full abstract»

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  • A prime factor FFT algorithm with real valued arithmetic

    Publication Year: 1985, Page(s):1241 - 1243
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A prime factor FFT algorithm involving only real valued arithmetic is devised to compute the discrete Fourier transform of a real sequence. This letter extends an approach proposed by Bracewell. View full abstract»

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  • A note on identification of linear time-invariant systems using exponential curve fitting

    Publication Year: 1985, Page(s):1243 - 1244
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    A simple method of system identification for linear time-invariant systems based on exponential curve fitting of impulse response data is presented. The simplicity of the method which does not require determination of initial conditions is the result of choosing appropriate discrete-time state-variable models. View full abstract»

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  • Design of high-performance negative-feedback amplifiers

    Publication Year: 1985, Page(s):1245 - 1246
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  • Principles of programming languages: Design, evaluation, and implementation

    Publication Year: 1985, Page(s): 1245
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  • Mechanical filters in electronics

    Publication Year: 1985, Page(s):1246 - 1247
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  • Book alert

    Publication Year: 1985, Page(s): 1247
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  • [Back cover]

    Publication Year: 1985, Page(s): c4
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Editor-in-Chief
H. Joel Trussell
North Carolina State University