Proceedings of the IEEE

Issue 1 • Jan. 1971

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Displaying Results 1 - 25 of 35
  • [Front cover and table of contents]

    Publication Year: 1971, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1971, Page(s): 3
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    Freely Available from IEEE
  • Microwave plasma devices—Promise and progress

    Publication Year: 1971, Page(s):4 - 19
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2197 KB)

    Over the last few years, considerable effort has been devoted to employing the plasma state in applications as widely differing as microwave and optical frequency devices; power generation by thermonuclear fusion; magnetohydrodynamic (MHD) and thermionic energy conversion, and the propulsion of spacecraft. In some of these areas intense activity still continues, and encouraging progress is being m... View full abstract»

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  • Magnetoelastic bandwidth compression

    Publication Year: 1971, Page(s):20 - 25
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (833 KB)

    A bandwidth compression process is described which uses the magnetoelastic normal modes of a ferrimagnetic crystal as independent subharmonic oscillators. The critical power level and mode density for this process are discussed and dynamic range is shown to be strongly dependent upon crystal geometry. Measurements have been made on a device with a 60-MHz input frequency and a 30-MHz output frequen... View full abstract»

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  • The control of a synchronous machine using optimal control theory

    Publication Year: 1971, Page(s):25 - 35
    Cited by:  Papers (77)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (861 KB)

    The selection of stabilizing signals to improve power system dynamic behavior is presented. Some results from modern control theory are used to show how such stabilizing signals may be derived systematically for a turboalternator model connected through a double circuit line to an infinite bus. The closed-loop performance of this nonlinear system model with the derived linear optimal controller is... View full abstract»

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  • Characteristics of randomly connected threshold-element networks and network systems

    Publication Year: 1971, Page(s):35 - 47
    Cited by:  Papers (74)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1189 KB)

    The characteristics of the networks which are composed of many randomly connected threshold elements are investigated with the intention of understanding some aspects of information processing in nervous systems. In these networks, the statistical properties of connection are sufficient to determine the characteristics. Information is carried by the activity level of a network which designates the... View full abstract»

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  • A study of the relationship between multipath distortion and wavenumber spectrum of refractive index in radio links

    Publication Year: 1971, Page(s):47 - 75
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2439 KB)

    The study reported here is concerned with relating the multipath and frequency selective fading characteristics of radio links caused by scatter phenomena to the statistical spatial characteristics of the refractive index. Two specific antenna configurations are studied in detail: the LOS (line-of-sight) case where the two antennas are pointed concentrically and the OTH (over-the-horizon) case whe... View full abstract»

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  • Modulating a hologram

    Publication Year: 1971, Page(s):77 - 78
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    Modulation of a hologram for the purpose of selecting different spatial channels may be easily implemented by putting a "signal" hologram and a "carrier" hologram (sheet-to-sheet) together. View full abstract»

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  • A general stability criterion of the oscillations in nonlinear systems

    Publication Year: 1971, Page(s):78 - 79
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (164 KB)

    A general stability criterion of the oscillations in systems containing a memoryless nonlinearity is derived. A new more general form of Loeb's criterion is also obtained by considering the variation of the generalized transfer function of the nonlinear element with frequency. View full abstract»

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  • Euclidean orthogonal data transmission

    Publication Year: 1971, Page(s):79 - 80
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (162 KB)

    A technique for data transmission using basis waveforms in a Euclidean space is presented. An example is used to demonstrate that this technique can give performance superior to that of the duobinary technique. View full abstract»

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  • A simple approach to obtaining network state equations

    Publication Year: 1971, Page(s):80 - 81
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (164 KB)

    A simple approach to obtaining the state equations for electric networks is introduced. This approach can easily accommodate any type of network element. It requires a relatively small number of simultaneous equations. An illustrative example is included. View full abstract»

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  • Variable bandwidth active filter which simulates the response of mutually coupled circuits

    Publication Year: 1971, Page(s):82 - 83
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (160 KB)

    A variable bandwidth active filter has been designed by realizing a transfer function similar to that of mutually coupled resonant circuits. The circuit provides approximately a 5:1 variation in 3-dB bandwidth while maintaining the peak magnitude constant within ±1.4 dB. View full abstract»

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  • Measurement of photoconductivity with microwave bridge

    Publication Year: 1971, Page(s):83 - 84
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (179 KB)

    When measuring the photoconductivity of low-loss materials at microwave frequencies, it is shown that an initially unbalanced bridge is more sensitive than an initially balanced one. In addition, an expression is derived for the effective conductivity in a material that is nonuniformly excited. View full abstract»

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  • The effect of coupling on monostatic-bistatic equivalence

    Publication Year: 1971, Page(s):84 - 86
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (300 KB)

    A simple physical model that predicts the error associated with the monostatic-bistatic equivalence theorem for the case where coupling is significant between sources of scattering is presented. The analysis is discussed in terms of both monochromatic-wave and short-pulse scattering. Experimental verification of the results is provided by isolating the coupling components through use of a high-res... View full abstract»

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  • Direct measurement of surface wave velocity and time delay—Temperature variation using a pulse technique

    Publication Year: 1971, Page(s):86 - 87
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (516 KB)

    An experimental pulse technique has been developed permitting rapid measurement of absolute surface wave velocity on single crystals to an accuracy of 1 percent or better. A further modification of the technique allows measurement of parts per million changes in surface wave time delay caused by changes in substrate temperature. The technique directly measures the vertical component of particle ve... View full abstract»

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  • A semiconductor-ferroelectric memory device

    Publication Year: 1971, Page(s):87 - 88
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (212 KB)

    The development of monolithic, optically written, and electrically read memory elements employing single-crystal barium titanate is described. Both single and multiple-unit structures have been made. These structures can be fabricated using techniques similar to those employed in integrated circuits. View full abstract»

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  • Finite-pole frequencies in monolithic crystal filters

    Publication Year: 1971, Page(s):88 - 89
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (193 KB)

    The use of a capacitor in a monolithic crystal filter to obtain finite poles is well known. Several authors have illustrated the variation of the pole frequencies due to the magnitude of the capacitor. The empirical conclusion is that the larger the capacitor, the closer the pole frequencies to the passband or the steeper the skirt. A simple formula is presented for calculating the precise value o... View full abstract»

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  • Self-pumped parametric amplification and oscillation of Gunn-effect diodes

    Publication Year: 1971, Page(s):89 - 90
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (203 KB)

    This letter describes self-pumped parametric effects resulting from the admittance variations of a domain which occur not when the domain grows near the cathode and is quenched at the anode, but when the bias voltage is varied by an RF output voltage. It is shown that a parametric change in admittance appears in a diode self-pumped by a voltage with a fundamental frequency and that additional admi... View full abstract»

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  • Photoemission yield dependency on bandgap energy for GaInAs alloys

    Publication Year: 1971, Page(s):90 - 91
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (206 KB)

    The photoemission yield dependency on bandgap energy has been investigated for GaInAs alloys by obtaining a series of spectral response curves for each alloy. The results qualitatively agree with calculated values. View full abstract»

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  • Effects of band-limiting on the detection of PCM/split-phase signals

    Publication Year: 1971, Page(s):91 - 93
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (269 KB)

    A receiver for PCM/split-phase signals using an integrate-and-dump filter is optimum only if the system bandwidth is infinite. Restriction of bandwidth results in a performance degradation. The degradation of signal-to-noise ratio is presented as a function of bandwidth-bit duration product and bit patterns. The average probability of bit-error is computed. View full abstract»

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  • Walsh-function generator

    Publication Year: 1971, Page(s):93 - 94
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (209 KB)

    In recent years several papers dealing with the mathematical theory as well as the technical applications of Walsh functions have been published. One method of defining Walsh functions is by using the Rademacher functions and the multiplication law of Walsh functions which is in fact a binary addition modulo 2 (no carry). This letter, however, describes in detail a method of defining Walsh functio... View full abstract»

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  • Composite IMPATT diodes for 110-GHz operation

    Publication Year: 1971, Page(s):94 - 95
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (531 KB)

    The assembly of composite silicon IMPATT diodes for 110-GHz operation with improved power-handling capability is described. Up to 140 mW CW output power at burnout was observed with a three-wafer assembly compared with 110 mW and 74 mW for the best performing double- and single-wafer units, respectively. The efficiencies were approximately 3 percent. View full abstract»

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  • An application of sparse matrix techniques to frequency analysis of linear circuits

    Publication Year: 1971, Page(s):96 - 97
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (260 KB)

    An implementation of Gaussian reduction of complex matrices by sparse matrix techniques is presented. The computer program described has been specifically tailored to perform frequency analysis of linear circuits within an on-line circuit-design programming system. View full abstract»

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  • Comments on "Terminal air traffic flow and collision exposure"

    Publication Year: 1971, Page(s):97 - 98
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  • The representation of nonlinear systems by exhaustive linearization

    Publication Year: 1971, Page(s):98 - 99
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (206 KB)

    Some established results in functional analysis yield a simple formula for representing physical systems exactly in terms of their linear behaviors. Although the formula has been exploited to solve bifurcation problems in elasticity and hydrodynamics, its use in system theory remains to be developed. View full abstract»

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H. Joel Trussell
North Carolina State University