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Proceedings of the IEEE

Issue 5 • Date May 1973

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Displaying Results 1 - 25 of 43
  • [Front cover and table of contents]

    Publication Year: 1973 , Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1973 , Page(s): 516 - 517
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    Freely Available from IEEE
  • Transportation, automation, and societal structure

    Publication Year: 1973 , Page(s): 518 - 525
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1237 KB)  

    Only when we learn to understand much better the dynamic interaction between new transportation systems and the structure of our communities can we take full advantage of transportation's potential as a really effective tool in our quest for a finer quality of life for our citizens. The opportunity to do so is much enhanced by the recent rapid evolution in transportation from its centuries-old pat... View full abstract»

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  • Freeway traffic surveillance and control

    Publication Year: 1973 , Page(s): 526 - 536
    Cited by:  Papers (9)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1174 KB)  

    In the past decade, automatic freeway surveillance and control systems have been introduced in several cities in the United States. Effective use of the hardware that has been implemented requires a sound mathematical basis for evaluation and optimization studies. In this paper, the nature of freeway congestion and the structure of systems which have been implemented to relieve this congestion are... View full abstract»

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  • Freeway-traffic data processing

    Publication Year: 1973 , Page(s): 537 - 541
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (536 KB)  

    Two basic data processing problems associated with freeway traffic are formulated: estimation of traffic variables (section mean speed and density) and detection of occurrence of an incident or accident within a given section of the road. The existing traffic sensors and the current estimation techniques and their shortcomings are reviewed. Stochastic models for traffic variables are developed and... View full abstract»

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  • TANA—An operating surveillance system for highway traffic control

    Publication Year: 1973 , Page(s): 542 - 556
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1878 KB)  

    A complete surveillance and traffic control electronic system was designed and is being put into operation in a newly built urban tollway in Naples, Italy. In this system, named TANA after the tollway name (TAngenziale di NApoli), information is collected from several hundred loop detectors placed along the highway (on each lane every 250 m) and is relayed to a Central Control Room, where it is pr... View full abstract»

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  • Transmission properties of wayside communication systems

    Publication Year: 1973 , Page(s): 556 - 561
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (588 KB)  

    Some transmission properties of wayside communication systems are discussed. These properties are common to all the wayside communication systems proposed for use on the high-speed ground transportation (HSGT) system. This study considers the method of echo theory, relating the ripple of the phase and amplitude response to the noise which may be produced in the channels. The noise sensitivity sugg... View full abstract»

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  • Continuous-access guided communication (CAGC) for ground-transportation systems

    Publication Year: 1973 , Page(s): 562 - 568
    Cited by:  Papers (22)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (669 KB)  

    Electromagnetic open-guiding structures, or surface waveguides, for continuous-access guided communication (CAGC) and obstacle detection ("guided radar"), are described for use in ground transportation, such as railways, highways, and more advanced guided systems. The experimental and theoretical work at Queen's University on surface-wave devices and their application to obstacle detection are rev... View full abstract»

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  • Baseline specifications for a magnetically suspended high-speed vehicle

    Publication Year: 1973 , Page(s): 569 - 578
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1117 KB)  

    Baseline specifications for a magnetically suspended vehicle capable of 300 mi/h (483 km/h) operation are given. The magnetic forces (lift, drag, and lateral) on a superconducting coil moving over an aluminum guideway are shown. The basic features of the associated cryogenics are presented along with a discussion of the cryogenic refrigeration requirements. Vehicle dynamics and the resultant ride ... View full abstract»

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  • Characteristics of superconductive magnetic suspension and propulsion for high-speed trains

    Publication Year: 1973 , Page(s): 579 - 586
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (567 KB)  

    Theoretical analyses are carried out on a magnetic suspension and a linear synchronous motor, both utilizing superconducting magnets. The derived theory is applied to the studies of the high-speed train models. In the suspension system investigated here, the roadbed is equipped with normal conducting coils. The magnetic lift force is found to be pulsating, and a design criterion for eliminating th... View full abstract»

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  • Design principles for magnetic levitation

    Publication Year: 1973 , Page(s): 586 - 598
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1481 KB)  

    General relations and limitations pertinent to the design of an inductive magnetic suspension system are derived. It is shown that in order to reduce magnetic drag we must increase the vehicle field and decrease the guideway currents. But this then produces a stiff suspension unless we are willing to increase guideway cost. Reasonable and consistent design objectives are shown to be: vehicle natur... View full abstract»

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  • Magnetic shielding for magnetically levitated vehicles

    Publication Year: 1973 , Page(s): 598 - 603
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (593 KB)  

    The magnetic shielding required for magnetically levitated vehicles is discussed. Shielding is needed to protect passengers in a vehicle from stray dc magnetic fields coming from the superconducting dipoles carried by the vehicle. In addition, the superconducting dipoles must be shielded against various ac magnetic fields. Here we consider shielding of ac magnetic fields generated by the propulsio... View full abstract»

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  • Evacuated tube vehicles versus jet aircraft for high-speed transportation

    Publication Year: 1973 , Page(s): 604 - 616
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1511 KB)  

    A preliminary investigation has been made of the potentialities of a high-speed low-loss transportation which could be competitive with the air-transport system. This system, called the MEL (magnetic-suspension, evacuated-tube, linear-motor-propulsion) system, employs passenger-carrying vehicles vertically supported by permanent magnets and laterally stabilized by an electro-magnetic servosystem, ... View full abstract»

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  • ROMAG®transportation system

    Publication Year: 1973 , Page(s): 617 - 620
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (407 KB)  

    The ROMAG®system of magnetically guiding and propelling vehicles using ordinary-temperature linear electric motors which combine levitation, thrust, guidance, and dynamic active suspension to achieve a high ratio of payload to vehicle weight is described. The vehicle requires low-cost passive track and provides a high degree of passenger ride comfort. It is applicable for low-cost ... View full abstract»

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  • A linear-induction-motor propulsion system for high-speed ground vehicles

    Publication Year: 1973 , Page(s): 621 - 630
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (2101 KB)  

    The design and development status of a linear-induction-motor propulsion system intended for use on high-speed ground vehicles is described. In this system, 3-phase, 60-Hz, 8250-V wayside power is converted by a solid-state power conditioning unit to a variable-voltage variable-frequency output suitable for use by linear-induction motors that provide up to 66 600-N (15 000-lb) propulsive thrust to... View full abstract»

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  • Evaluation of fixed and moving primary linear induction motor systems

    Publication Year: 1973 , Page(s): 631 - 637
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (581 KB)  

    Linear induction motors being proposed for high-speed ground transportation may have their primaries carried on board the vehicle or embedded in the guideway. This paper evaluates various aspects, such as power requirements, power switching and controls, utilization factor, efficiency and cost, etc., for these two alternatives and provides the basic format on which relative merits of various syste... View full abstract»

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  • Propulsion and levitation forces in a single-sided linear induction motor for high-speed ground transportation

    Publication Year: 1973 , Page(s): 638 - 644
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (707 KB)  

    A realistic mathematical model of the single-sided linear induction motor (SLIM) is presented. Using this model, propulsion and levitation forces are computed for a SLIM with back iron. The validity of the analysis is verified by tests on a laboratory model. Some associated problems are outlined, and the feasibility of SLIM's for high-speed ground transportation (HSGT) is discussed. With regard to... View full abstract»

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  • SYNCHROTRAC—An off-board control system for automated mass transit

    Publication Year: 1973 , Page(s): 644 - 646
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (296 KB)  

    SYNCHROTRAC is a power control system that provides longitudinal control of vehicles by a unique method in which it distributes power to those vehicles. The vehicles are passive (control-wise) in that power modulation is accomplished by the vehicle's position within the traveling control section. Therefore, no on-board power modulation or communication equipment is required. The SYNCHROTRAC system... View full abstract»

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  • Principles of operation of linear induction devices

    Publication Year: 1973 , Page(s): 647 - 656
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (584 KB)  

    An approach to the analysis of linear motors, based on the Fitzgerald superpotential is outlined. The usefulness of the approach is demonstrated in calculations of the fields, the streamline pattern, and the performance characteristics of some versions of the linear motor. Analysis of the streamline pattern brings out, in turn, the influence of the end effects. View full abstract»

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  • Design formulas for biquad active filters using three operational amplifiers

    Publication Year: 1973 , Page(s): 662 - 663
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (235 KB)  

    A circuit configuration and its design formulas are presented for the realization of all the useful forms of a biquadratic voltage transfer function. The circuit employs three single-ended operational amplifiers, two capacitors, and at most eight resistors. With an additional resistor, it can realize any biquadratic voltage transfer function. View full abstract»

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  • Hilbert transform relations for products

    Publication Year: 1973 , Page(s): 663 - 664
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (261 KB)  

    A general formula for the Hilbert transform of a product of complex-valued functions is developed. Certain simplifications are then exhibited for products often encountered in the context of modulation and signal processing. The approach chosen is one of frequency partitioning; this permits signal definition on complementary sections of the frequency axis and leads to compact and easily manipulate... View full abstract»

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  • Quotient generation with conventional binary multipliers

    Publication Year: 1973 , Page(s): 664 - 665
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (228 KB)  

    With only minor modifications a conventional binary multiplier can generate the reciprocal of any given binary number to any desired precision. The quotient of any two binary numbers can then be generated as the product of the dividend and the reciprocal of the divisor. View full abstract»

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  • Low-frequency noise of ion-implanted double-drift IMPATT diodes

    Publication Year: 1973 , Page(s): 666 - 667
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (139 KB)  

    The low-frequency open circuit noise spectral density S(f) of an ion-implanted 60-GHz double-drift-region IMPATT diode was measured as a function of the dc avalanche current I0. Over an intermediate current range the noise follows an S(f)=a2VB02/I0relationship where VB0is the reverse breakdown voltage and a2≃4.5 ... View full abstract»

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  • Comments on "Theorems of bianisotropic media"

    Publication Year: 1973 , Page(s): 667 - 668
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  • A modified generalized discrete transform

    Publication Year: 1973 , Page(s): 668 - 669
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (184 KB)  

    A modified version of the generalized discrete transform described earlier is now developed. The transform matrix of this modified version has a number of zeros as its elements, and consequently its matrix factors are more sparse. This results in fewer arithmetic operations and corresponding savings in computer time, when information is processed. View full abstract»

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North Carolina State University