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3 edition of Theoretical, experimental, and computational evaluation of a tunnel ladder slow-wave structure found in the catalog.

Theoretical, experimental, and computational evaluation of a tunnel ladder slow-wave structure

Theoretical, experimental, and computational evaluation of a tunnel ladder slow-wave structure

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Electrical impedance.,
  • Millimeter waves.,
  • Traveling wave tubes.,
  • Waveguides.

  • Edition Notes

    StatementThomas M. Wallett and A. Haq Qureshi.
    SeriesNASA technical memorandum -- 106642
    ContributionsQureshi, A. Haq., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17113549M

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Theoretical, experimental, and computational evaluation of a tunnel ladder slow-wave structure Download PDF EPUB FB2

EXPERIMENTAL EVALUATION In many instances the theoretical analysis of a circuit may be too complicated to solve for the dispersion relation of a structure. The dispersion characteristics can be experimentally measured using a standard technique [1,7] in which resonance frequencies of a section of the circuit are measured with.

The dispersion characteristics of a tunnel ladder circuit in a ridged wave guide were experimentally measured and determined by computer simulation using the electromagnetic Theoretical MAFIA.

To qualitatively estimate interaction impedances, resonance frequency shifts due to a perturbing dielectric rod along the axis were also measured indicating the axial electric field : A. Haq Qureshi and Thomas M. Wallett. Get this from a library. Theoretical, experimental, and computational evaluation of a tunnel ladder slow-wave structure.

[Thomas M Wallett; A Haq Qureshi; United States. National Aeronautics and Space Administration.]. Slow-Wave Structures Making use of the variation with z and t defined in () A v z V p = ω β 0 0 2, () where v p0 is the phase velocity of the TEM wave on the unmodified structure.

Substituting for A z in () gives E aj v v z V. The dispersion characteristics of a tunnel ladder circuit in a ridged wave guide were experimentally measured and determined by computer simulation using the electromagnetic experimental MAFIA. THEORETICAL ANALYSIS OF TUNNEL LINING SUBJECTED TO FIRE M.

Mansour Civil Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt. [email protected] (Received Janu Accepted March 1, ). The present paper aims to investigate the impact of fire on the behavior of concrete structures such as by: 1.

In order to provide theoretical support, small-scale experiments and theoretical analysis are carried out in this paper to predict the maximum temperature beneath ceiling when there is a fire in tunnel with vertical shafts.

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The principle of our method [3, 4] is shown in Fig. A helix spring stretched in. The evaluation of bridge aerodynamic instability is traditionally based on direct wind tunnel testing and theoretical analysis method with experimentally identified parameters from wind tunnel by: scaled models, and sometimes actual structure in Wind Tunnels.

The size, speed and other environmental conditions of tunnel are determined by the actual users problems. Leaving the size and environmental to the actual users, the speed determines the type of the tunnel namely, subsonicFile Size: 1MB.

A computational evaluation of two stability experiments conducted in the NASA Langley Mach 6 axisymmetric quiet nozzle test chamber facility is conducted. Navier-Stokes analysis of the mean flow and linear stability theory analysis of boundary layer disturbances is performed in the by: 5.

Abram I.A., Dias D., Mathieu P., Kastner R. () Tunnel Modelling in Analogical Soil: Comparison of Experimental and Computational Results Obtained with a Finite Difference Program. In: Cividini A.

(eds) Application of Numerical Methods to Geotechnical Problems. International Centre for Mechanical Sciences (Courses and Lectures), vol Author: I. Al Abram, D. Dias, P. Mathieu, R. Kastner. The theory of ``direct'' and ``phonon‐assisted'' tunneling is reviewed.

Theoretical I–V characteristics are calculated using the constant field model. Generalizations to nonconstant field and more complicated band structure models are discussed by:   Xia H, Chen JG, Xia CY, Inoue H, Zenda Y, Qi L (c) Experimental study of train-induced structural and environmental vibrations of rail transit elevated bridge with ladder tracks [J].

J Rail Rapid Transit ()– Google Scholar. III European Conference on Computational Mechanics Solids, Structures and Coupled Problems in Engineering C.A.

Mota Soares (eds.) Lisbon, Portugal, 5–8 June CFD BASED EVALUATION OF THE LOCK-IN PHENOMENON OF A BRIDGE UNDER WIND LOAD AdelinoV. Lopes 1, Álvaro Cunha 2 and Luís M. Simões 1 1 Department of Civil EngineeringCited by: 2.

Computational and Experimental Methods in S tructures Series Editor: Ferri M. Aliabadi (Imperial College London, UK) Vol. 1 Buckling and Postbuckling Structures: Experimental, Analytical and Numerical Studies edited by B. Falzon and M. Aliabadi (Imperial College London, UK) Vol.

2 Advances in Multiphysics Simulation and Experimental. For example, some embodiments provide a coupled cavity traveling wave tube including a plurality of core segments arranged in spaced-apart fashion to form an electron beam tunnel, a first longitudinal member adjacent the plurality of core segments alternately extending toward and receding from successive core segments, and a second longitudinal member adjacent to the plurality of core Cited by: 5.

Theoretical and experimental investigation of high-speed bearings This article presents the results of computational simulation and experimental research performed on bearing structure”, Journal of Vibration Engineering & Technologies, Vol. 4(3), A THEORETICAL AND EXPERIMENTAL STUDY OF UNSTEADY FLOW PROCESSES IN A LUDW IEG TUBE WIND TUNNEL SUMMARY The application of a numerical procedure generally referred to as the method of characteristics to calculate the nonsteady discharge of compressed air through a Ludwieg tube type of wind tunnel is presented.

The mathematicalFile Size: KB. Terms and descriptions7 Figure Description of the parts of a cross-section Figure Description of the parts of a longitudinal section Tunnel portals are the structure provided at the ends of a tunnel to support against slope sliding, lateral earth pressure and falling rock (Fig.

The compression wave generated by a high-speed train emerging from the exit portal of a tunnel gives rise to an impulsive noise called a micro-pressure wave. In this study, new methods for the prediction of sonic-boom noise are proposed.

The first method combines acoustic monopole analysis and the method of characteristics with the Kirchhoff by: The dispersion characteristics of a tunnel ladder circuit in a ridged wave guide were experimentally measured and determined by computer simulation using the.Sensors, an international, peer-reviewed Open Access journal.

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