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Showing 1 to 20 of 99 for “"Rough surface"”.

  1. Kirchhoff approximation for rough surface scattering

    Mou, Alex.Massachusetts Institute of Technology1993

    Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 1993

    mit Repository record

  2. Applications of numerical models for rough surface scattering

    Johnson, Joel T. (Joel Tidmore)Massachusetts Institute of Technology1996

    Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.

    mit Repository record

  3. Rough Surface Interactions of Micro/nano-Scale Contact Systems

    Yeo, Chang-DongUniversity of Illinois at Urbana-Champaign2015

    … and elastic modulus values. Second, an improved rough surface contact model suitable for miniature systems has been developed accounting for both asperity and substrate deformation during contact. Compared to a representative asperity-based contact model, it was found that the proposed model is …

    uiuc Repository record

  4. The Monte Carlo techniques with pulse compression for rough surface scattering

    Yan, Jun KentMassachusetts Institute of Technology1996

    Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1996.

    mit Repository record

  5. Rough surface scattering under Gaussian beam illumination and the Kirchhoff approximation

    Tyeryar, Keith AllenVirginia Tech1993

    … this thesis, an analysis of the scattering of a rough perfect electric conductor (PEC) surface under illumination by a Gaussian beam using the Kirchhoff approximation is presented. The analysis assumes a source distribution which yields a Gaussian beam solution as a radiated field. This field is …

    vt Repository record

  6. Rough Surface Scattering and Propagation over Rough Terrain in Ducting Environments

    Awadallah, Ra'id S.Virginia Tech1998

    The problem of rough surface scattering and propagation over rough terrain in ducting environments has been receiving considerable attention in the literature. One popular method of modeling this problem is the parabolic wave equation (PWE) method. In this method, the Helmholtz wave equation is …

    vt Repository record

  7. Effect of correlation between shadowing and shadowed points in rough surface scattering

    Kapp, David AnthonyVirginia Tech1993

    Shadowing of random surfaces is accounted for by multiplying the Kirchhoff electric current density by a shadowing function. The shadow-corrected incoherent intensity is computed in the backscatter direction and is found to be proportional to the probability of a specular point being illuminated …

    vt Repository record

  8. Heat Transfer Analysis of an Oblique Jet Impingement Cooling on CMC Rough Surface

    Krishna, Karthik

    … cooling will still likely be required. The surface of the CMC varies significantly from traditional super-alloy used in a modern engine, with large level of roughness and significant three-dimensional waviness. These complex features will impact the behavior of the near wall flows, and …

    embry-riddle Repository record

  9. A Curvature-Corrected Rough Surface Scattering Theory Through The Single-Scatter Subtraction Method

    Diomedi II, Kevin PaulVirginia Tech2019

    … is presented to study radio propagation and rough surface scattering problems based on a reformulation of the Magnetic Field Integration Equation (MFIE) called the Single-Scatter Subtraction (S^3) method. This technique amounts to a physical preconditioning by separating the single- and …

    vt Repository record

  10. A Study of Rough Surface Scattering Phenomena in the LMDS Band (28 GHz)

    Dillard, Cindy LinVirginia Tech2003

    … from each power delay profile to analyze the rough surface scattering phenomena. We found that limestone and brick walls exhibited some diffuse scattering. The reflected pulse of a limestone wall had more maximum excess delay spread than did a brick wall at -15dB power threshold. The mean …

    vt Repository record

  11. Statistical approach for determining the extent of an oil spill over a rough surface.

    Patureau, Jean-PierreMassachusetts Institute of Technology1972

    Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1972. M.S.

    mit Repository record

  12. Efficient integral equation based algorithms for parasitic extraction of interconnects with smooth or rough surface

    Zhu, Zhenhai, 1970-Massachusetts Institute of Technology2004

    … The program is based on a recently developed surface integral formulation and a Pre-corrected FFT accelerated iterative method, but includes a new piecewise quadrature panel integration scheme, a new scaling and preconditioning technique as well as a generalized grid interpolation and …

    mit Repository record

  13. Numerical study on the validity of the quasi-specular and two-scale models for rough surface parameter estimation: one dimensional surfaces

    Marchand, Roger T.Virginia Tech1996

    … and two-scale models in estimating rough surface parameters from the average radar cross section of randomly rough surfaces, with the goal of understanding what scattering mechanisms limit their applicability. The ranges of validity of these models are ascertained by comparing the …

    vt Repository record

  14. ΣΚΕΔΑΣΗ ΗΛΕΚΤΡΟΜΑΓΝΗΤΙΚΟΥ ΚΥΜΑΤΟΣ ΑΠΟ ΑΓΩΓΙΜΗ ΕΠΙΦΑΝΕΙΑ ΣΤΟΧΑΣΤΙΚΑ ΑΝΩΜΑΛΗ ΚΑΙ ΧΡΟΝΙΚΑ ΜΕΤΑΒΑΛΛΟΜΕΝΗ

    Χρυσουλίδης, Δημήτριος, Chrissoulidis, DimitriosAristotle University Of Thessaloniki (AUTH)1983

    … PLANE ELECTROMAGNETIC WAVES FROM RANDOMLY UNEVEN SURFACES ISTHEORETICALLY INVESTIGATED BY USING MORE COMPLICATED MODELS FOR THE SCATTERING SURFACE. IN THE FIRST PART OF THE WORK A TIME-VARYING RANDOM ROUGH SURFACE IS EXAMINED. THE STOCHASTIC PROCESS, THAT DESCRIBES THE ELEVATION FROM ITS …

    greece Repository record

  15. Modeling of conductor surface roughness effect

    Ma, XiaoUniversity of Illinois at Urbana-Champaign2015

    Conductor surface roughness effect refers to the influence of surface roughness on the current flow inside a conductor and the subsequent effect on electromagnetic properties of the conductor. The existence of surface roughness on a conductor disturbs current flow and results in a higher than usual …

    uiuc Repository record

  16. An Investigation on the Effect of Ground Plane Roughness on Antenna Radiation Characteristics

    Poland, William HamiltonVirginia Tech2025

    … both a flat ground plane and a randomly-varying rough surface. The Method of Moments with the Electric Field Integral Equation (EFIE) is used to account for all coupling interactions. Monte Carlo averaging is used to compute results over multiple rough surface realizations, which follow the …

    vt Repository record

  17. MULTI-SCALE DYNAMICS OF MECHANICAL SYSTEMS WITH FRICTION

    Sepehri, Ali

    Contact between rough surfaces occurs in numerous engineering systems and in many instances influences the macro behavior of the system. In many instances, the interaction between rough surfaces, affect the macro behavior of the system. Effective treatment of systems containing rough surface …

    siu-theses Repository record

  18. Propagation and Scattering of Waves by Terrain Features

    Davis, Bradley A.Virginia Tech2000

    … and scattering of waves. It begins with the rough knife obstruction case, moves into rough surfaces and finally concludes with several approaches to a foliage covered rough surface. Each of these problems is encountered in radar, remote sensing and communication systems. The first topic in …

    vt Repository record

  19. Efficient Spectral-Element Methods For Acoustic Scattering And Related Problems

    He, Ying

    … 2) the scattering from doubly layered, unbounded rough surface. For both cases, we first apply the transformed field expansion (TFE) method to reduce the two-dimensional Helmholtz equation with complex scattering surface into a successive sequence of the transmission problems with a plane …

    purdue-thes Repository record

  20. Interfaces in disordered media. Scaling growth, avalanche dynamics, and microfluidic fronts

    Pradas, MarcUniversitat de Barcelona2009

    … to classify the <i>scaling growth</i> of a rough surface in terms of <i>universality classes</i> has become a considerably ambitious task, not to say impossible in some cases. <br></br><br></br> This is particularly true, for instance, in the problem of a fluid filling a disordered medium …

    the-open-u Repository record

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