Propagation of waves

Xem 1-20 trên 51 kết quả Propagation of waves
  • This book is intended as a general introduction to modern physics for science and engineering students. It is written at a level which presurnes a prior tull year’s course in classical physics, and a knowledge of elementary differential and integral calculus. The material discussed here includes probability, relativity, quantum mechanics, atomic physics, statistical mechanics, nuclear physics and elementary particles.

    pdf540p kinhdo0908 11-10-2012 53 27   Download

  • In this paper we describe the propagation of C ∞ and Sobolev singularities for the wave equation on C ∞ manifolds with corners M equipped with a Rie2 1 mannian metric g. That is, for X = M × Rt , P = Dt − ∆M , and u ∈ Hloc (X) solving P u = 0 with homogeneous Dirichlet or Neumann boundary conditions, we show that WFb (u) is a union of maximally extended generalized broken bicharacteristics. This result is a C ∞ counterpart of Lebeau’s results for the propagation of analytic singularities on real analytic manifolds with...

    pdf65p dontetvui 17-01-2013 31 6   Download

  • Lately, there has been a growing interest in electromagnetic wave propagation in complex systems such as modern materials and structures. This book is intended to give the explanatory 20 chapters which consist of original works of the leading scientists in the field of wave propagation which produced theoretical and experimental methods in this field of research and obtained important results.

    pdf0p ktcn_1 10-07-2012 40 10   Download

  • A major topic in this book is the study of propagation and scattering of waves by randomly distributed particles. We first consider scattering by a single particle. This chapter and the next discuss and derive the scattering characteristics of a single particle. Both exact and solutions are studied. Scattering by a single ...

    pdf225p iamvip01 04-05-2012 38 9   Download

  • This book is based on the contributions of several authors in electromagnetic waves propagations. Several issues are considered. The contents of most of the chapters are highlighting non classic presentation of wave propagation and interaction with matters. This book bridges the gap between physics and engineering in these issues. Each chapter keeps the author notation that the reader should be aware of as he reads from chapter to the other. The author’s notations are kept in order to eliminate any possible unintentional errors that might lead to confusion.

    pdf306p ktcn_1 10-07-2012 38 7   Download

  • We have known the close connection between changing eletric fields and magnetic fields. They can create each other and form a system of electromagnetic fields.  Electromagnetic fields can propagate in the space (vacuum or material environment). We call them electromagnetic waves. They play a very important role in science and technology.

    pdf49p thanhan 22-07-2009 95 19   Download

  • The wireless era was started by two European scientists, James Clerk Maxwell and Heinrich Rudolf Hertz. In 1864, Maxwell presented Maxwell's equations by unifying the works of Lorentz, Faraday, Ampere, and Gauss. He predicted the propagation of electromagnetic waves in free space at the speed of light. He postulated that light was an electromagnetic phenomenon of a particular wavelength and predicted that radiation would occur at other wavelengths as well. His theory was not well accepted until 20 years later, after Hertz validated the electromagnetic wave (wireless) propagation.

    pdf332p iamvip01 04-05-2012 52 17   Download

  • This volume, derived from the Handbook of Engineering Electromagnetics (2004), is intended as a desk reference for the fundamentals of engineering electromagnetics. Because electromagnetics provides the underpinnings for many technological fields such as wireless communications, fiber optics, microwave engineering, radar, electromagnetic compatibility, material science, and biomedicine, there is a great deal of interest and need for training in the concepts of engineering electromagnetics.

    pdf394p gian_anh 18-10-2012 40 17   Download

  • This book is dedicated to various aspects of electromagnetic wave theory and its applications in science and technology. The covered topics include the fundamental physics of electromagnetic waves, theory of electromagnetic wave propagation and scattering, methods of computational analysis, material characterization, electromagnetic properties of plasma, analysis and applications of periodic structures and waveguide components, and finally, the biological effects and medical applications of electromagnetic fields....

    pdf0p ktcn_1 10-07-2012 40 14   Download

  • In this chapter, we present in a nutshell the fundamental aspects of engineering electromagnetics from the view of looking back in a reflective fashion at what has already been learned in undergraduate electromagnetics courses as a novice. The first question that electromagnetics.

    pdf403p beobobeo 01-08-2012 50 14   Download

  • The book collects original and innovative research studies of the experienced and actively working scientists in the field of wave propagation which produced new methods in this area of research and obtained new and important results. Every chapter of this book is the result of the authors achieved in the particular field of research. The themes of the studies vary from investigation on modern applications such as metamaterials, photonic crystals and nanofocusing of light to the traditional engineering applications of electrodynamics such as antennas, waveguides and radar investigations....

    pdf0p cucdai_1 20-10-2012 22 7   Download

  • The first is Faraday’s law of induction, the second is Amp`ere’s law as amended by Maxwell to include the displacement current ∂D/∂t, the third and fourth are Gauss’ laws for the electric and magnetic fields. The displacement current term ∂D/∂t in Amp`ere’s law is essential in predicting the existence of propagating electromagnetic waves. Its role in establishing charge conservation is discussed in Sec. 1.7. Eqs. (1.1.1) are in SI units.

    pdf0p kuckucucu 15-05-2012 31 5   Download

  • A  numerical  model  based  on  the  2D  shallow  water  equations  was  developed  using  the  Finite Volume Method. The model was applied to the study of long wave propagation and runup  on  a  conical  island.  The  simulated  results  by  the  model  were  compared  with  published  experimental  data  and  analyzed  to  understand  more  about  the  interaction  processes  between  the  long waves and conical island in terms of water profile and wave runup height.

    pdf9p dem_thanh 22-12-2012 28 4   Download

  • A wave is one of the basic physics phenomena observed by mankind since ancient time. The wave is also one of the most-studied physics phenomena that can be well described by mathematics. The study may be the best illustration of what is “science”, which approximates the laws of nature by using human defined symbols, operators, and languages.

    pdf0p phoebe75 19-02-2013 21 4   Download

  • A numerical model using the 1D shallow water equations was developed for the simulation of long wave propagation and runup. The developed model is based on the Finite Volume Method (FVM) with an application of Godunov - type scheme of second order of accuracy. The model uses the HLL approximate Riemann solver for the determination of numerical fluxes at cell interfaces. The model was applied to the simulation of long wave propagation and runup on a plane beach and simulated results were compared with the published experimental data. The comparison shows that the present model has a power...

    pdf6p dem_thanh 22-12-2012 14 3   Download

  • Techniques for non-invasive Breslow determination use either mechanical or electromagnetic waves. A wave is the propagation of a perturbation inducing reversible variations of local physical properties. It transports energy but no matter. Ultrasounds and optical waves are used mainly because of their innocuousness. In the next paragraphs, ultrasonography then several optical techniques will be developed. Basic physical principles of each type of wave interaction with skin will be described then accuracy of Breslow index determination by such techniques will be given.

    pdf186p ti_du_hoang 15-08-2012 24 2   Download

  • Different terms are employed in the literature to specify this method on investigations: dualbeam coherent interferometry or laser Doppler interferometry, optical coherence tomography (OCT) or optical coherence reflectometry. OCT is analogous to ultrasonic imaging, which measures the intensity of reflected infrared light rather than reflected sound waves from the sample. Time gating is employed so that the time for the light to be reflected back (or echo delay time) is used to assess the intensity of back-reflection as a function of depth.

    pdf298p ti_du_hoang 15-08-2012 36 2   Download

  • Low-frequency acoustic energy released within the Earth's crust and mantle mostly propagates - depending on the density and elasticity of the medium - through several types of seismic waves categorized as body waves (longitudinal P and transverse S) or surface waves (long L and ground roll R). The importance of seismic wave research lies not only in our ability to understand and predict earthquakes and tsunamis, it also reveals information on the Earth's composition and features in much the same way as it led to the discovery of Mohorovicic's discontinuity....

    pdf172p cucdai_1 16-10-2012 29 1   Download

  • We studied theoretically and experimentally the transformation, attenuation, and setup due to shoaling and breaking of internal waves in a two-layer fluid system on a uniform slope. An image processing technique was used to illustrate 2D instantaneous displacements of density interface. These results were compared with the calculated values by using the method of characteristics, the simple shoaling model with energy dissipation, and the momentum balance equation based on a radiation stress concept.

    pdf11p tinhluong123 21-11-2015 8 1   Download

  • Introduction waves and phasors, transmission lines, vector analysis, electrostatics, magnetostatics, maxwell’s equations for time-varying fields, plane-wave propagation, wave reflection and transmission,... As the main contents of the document "Fundamentals of Applied Electromagnetics 6e by Fawwaz T. Ulaby, Eric Michielssen, and Umberto Ravaioli". Invite you to consult.

    pdf290p luutrutailieu112 11-12-2015 26 4   Download


Đồng bộ tài khoản