lamb wave propagation in plates

... radio engineering tools to model the electromagnetic propagation in tunnels for radio planning and network tuning In this article, we propose an original method based on a Ray Launching method ... simulation is presented in Figure First step consists in extracting fast fading by using a running mean The window’s length is 40 λ on the first 50 m, and 100 λ elsewhere , according to the literature ... consists in a minimization of the path length, according to the Fermat Principle Finally, an adaptive IMR has been developed based on the localization of reflection points Results obtained in a straight...

Ngày tải lên: 18/06/2014, 22:20

... radio engineering tools to model the electromagnetic propagation in tunnels for radio planning and network tuning In this article, we propose an original method based on a Ray Launching method ... simulation is presented in Figure First step consists in extracting fast fading by using a running mean The window’s length is 40 λ on the first 50 m, and 100 λ elsewhere , according to the literature ... consists in a minimization of the path length, according to the Fermat Principle Finally, an adaptive IMR has been developed based on the localization of reflection points Results obtained in a straight...

Ngày tải lên: 20/06/2014, 04:20

... calculation Using the Fermat Principle, indicating that the way followed by the wave between two points is always the shortest, we propose to reduce the geometrical approximation involved in each path ... simulation is presented in Figure First step consists in extracting fast fading by using a running mean The window’s length is 40 l on the first 50 m, and 100 l elsewhere, according to the literature ... consists in a minimization of the path length, according to the Fermat Principle Finally, an adaptive IMR has been developed based on the localization of reflection points Results obtained in a straight...

Ngày tải lên: 20/06/2014, 21:20

... using Eqn (2-3) (a) Unplated ring chain (b) Plated ring chain Fig 2-9 Ring chains used in the experiments conducted by S R Reid et al [12] Table 2-1 Elastic wave speeds in mild steel ring chains ... constituting an interconnected network of struts or plates Many of these newer foams are increasingly used for insulation, as cushioning, and in systems for absorbing kinetic energy in impacts ... Elastic Wave Speed in a Single Ring by Impact Testing .32 §3.4 Determination of Wave Velocity in Ring Arrays… 37 §3.4.1 Experimental Procedure 37 §3.4.2 Results of Impact Tests on Ring...

Ngày tải lên: 05/10/2015, 19:03

... robust in generating infectious prion particles than in vivo systems Nonetheless, prion strain properties of brain-derived PrPSc appeared to be conserved in the PMCA product by exhibiting indistinguishable ... expressed in tation, E.coli every Prion-infected crude brain homogenate PrP27-30 Purified PrPSc or crude homogenate of prion-infected brains Prion-infected crude brain homogenate rPrPC expressed in ... method to convert full-length rPrP encompassing residues 23-230 into amyloid fibrils by incubating in a 96-well plate with continuous agitation Combining the ThT fluorescence assay to this system...

Ngày tải lên: 03/11/2012, 11:52

... Shear Wave Propagation in Soft Tissue and Ultrasound Vibrometry Yi Zheng, Xin Chen, Aiping Yao, Haoming Lin, Yuanyuan Shen, Ying Zhu, Minhua Lu, Tianfu Wang and Siping Chen Chapter Acoustic Wave Propagation ... Haoming Lin, Yuanyuan Shen, Ying Zhu, Minhua Lu, Tianfu Wang and Siping Chen Department of Biomedical Engineering, School of Medicine, ShenZhen Univeristy, ShenZhen, China Xin Chen, Haoming Lin, ... Shear Wave Propagation in Soft Tissue and Ultrasound Vibrometry Yi Zheng, Xin Chen, Aiping Yao, Haoming Lin, Yuanyuan Shen, Ying Zhu, Minhua Lu, Tianfu Wang and Siping Chen Additional information...

Ngày tải lên: 15/03/2014, 23:20

... than by trying out solutions to intertwined constraints We have begun exploring such methods in a preliminary and approximate way by implementing a modular, non-searching constraint -propagation ... constraints instead of being composed of independently derivable subparts There is little alternative to running through the possible cases in a combinatorial way In contrast to this picture, in ... lexical string (e.g t r y + a ) that is supplied as input Instead of considering the tuples in this space individually, the constraint -propagation algorithm summarizes whole sets of tuples in slightly...

Ngày tải lên: 17/03/2014, 20:20

... from the boundaries towards the ends of the  wave absorbing zones. Finally, at the ends of  the  wave absorbing  zones,  the  Summerfeld  radiation  condition  for  long  waves  are  introduced to let remaining waves going out  ... lost  wave energy  is  transformed  into  turbulence  energy.  At  the  beginning  of  the  wave breaking  process,  the  turbulence  is  confined into a small portion of the breaking  wave ... Coastal Engineering 34 (1998) 277.  [14] H.A.  Schaffer,  P.A.  Madsen,  R.  Deigaard,  A  Boussinesq  model  for  waves  breaking  in shallow water, Coastal Engineering 20 (1993) 185.  [15] F.C.K. Ting, J.T. Kirby, Observation of undertow ...

Ngày tải lên: 28/03/2014, 15:20

... and nutrients in these environments They have a special role in stabilizing shorelines, minimizing wave damage, and trapping sediments However, in recent decades mangrove forests in Vietnam are ... relation to the index of increasing and deceasing flow rate Average elevation difference within a watershed is inversely significant with increasing and decreasing flow rate It explains about 28% of ... characteristics of incident waves (Massel et al., 1999; Alongi, 2008) The dissipation of wave energy inside mangrove forests is mostly caused by wave- trunk interactions and wave breaking (Luong et...

Ngày tải lên: 03/04/2014, 12:22

... in a retrieval system or transmitted in any form or by any means, electronic or mechanical, including uploading, downloading, printing, decompiling, recording or otherwise, except as permitted ... Single-Mode Input 4.2.2 Two-Mode Coherent Input 4.2.3 Two-Mode Incoherent Input 4.3 Power Fluctuations—Two-Mode Guide 4.3.1 Single-Mode Input 4.3.2 Two-Mode Coherent Input 4.3.3 Two-Mode Incoherent Input ... (3.49) j sin ck cos ck ∗ ∗ z cos ck ∗ z j sin ck cos ck z ∗ j sin ck · e− j sin ck · e− z z z ∗ cos ck ∗ j sin ck · e− cos ck · e− z cos ck · e− j sin ck · e− z j sin ck z j sin ck cos ck z j sin ck...

Ngày tải lên: 24/04/2014, 17:23

... radio waves THE EARTH’S ATMOSPHERE IONOSPHERE While radio waves traveling in free space have little outside influence to affect them, radio waves traveling in the earth’s atmosphere have many influences ... knowledge of radiowave propagation to exercise good judgment when selecting transmitting and receiving antennas and operating frequencies Selecting a usable operating frequency within your given ... thin waveguide radiator Rather than a single focal point, this type of reflector has a series of focal points forming a straight line Placing the radiator, or radiators, along this focal line...

Ngày tải lên: 27/05/2014, 02:43

... Printed in Croatia A free online edition of this book is available at www.intechopen.com Additional hard copies can be obtained from orders@intechweb.org Electromagnetic Waves Propagation in ... modeling  electromagnetic  wave propagation and  scattering  in soil  by  solving  Maxwell’s  equa‐ tions using a finite difference time domain (FDTD) model. The chapter explains how  the  lossy  ... the vector wave equation in cylindrical coordinates for a gyroelectric medium (Ren, 1993) continued that work for spherical coordinates in a similar procedure and obtained spherical wave functions...

Ngày tải lên: 19/06/2014, 21:20

... dipole in such a medium was examined and the corresponding radiation patterns were presented 12 Electromagnetic Waves Propagation in Complex Matter Electromagnetic Waves 10 (a) Case ε = (b) View in ... si(k n r + k0 x ) , (46) where integral cosine and integral sine functions are defined by the following formulae: Ci(z) = γ + ln(z) + z cos(t) − dt, t si(z) = z sin(t) π dt − t (47) and Euler constant ... z (a 16 Electromagnetic Waves Propagation in Complex Matter Electromagnetic Waves 14 (a) Case r = (b) View in meridian surface r = 3, ϕ = π/2 (c) Case at r = (d) View in meridian surface r =...

Ngày tải lên: 19/06/2014, 21:20

... circuitry-engineering modeling of high-frequency radio-engineering devices and investigation of the propagation of electromagnetic waves in media of intricate geometry in the presence of strong discontinuities ... determines, in a recurrence manner, sequences of integrand poles and residues in these poles The edge diffraction field in both media is determined using a pair of Fredholmtype singular integral ... by the surfaces and are inhomogeneous in space At the same time, the study of the propagation of waves in layered conducting media and, according to (Born, 1970), in thin films is reduced to the...

Ngày tải lên: 19/06/2014, 21:20

... without introducing complex parameters In closing, we note that a monochromatic wave is infinite in space and time, has infinitesimal energy absorption in a material medium, and transfers infinitesimal ... Nonlinear Propagation of Electromagnetic Waves in Antiferromagnet Xuan-Zhang Wang and Hua Li School of Physics and Electronic Engineering, Harbin Normal University China Introduction The nonlinearities ... magnetic field of ordinary intensity since very intense AF exchange interaction exists in them, so they are almost not useful in the fields of electronic and electric engineering But the dynamical...

Ngày tải lên: 19/06/2014, 21:20

... zero in the circumstance of linearity (TM waves) We begin from the linear wave solution that has been given section to look for the nonlinear wave solution in AF layers In the case of linearity, ... source term in the harmonic wave equation and is excited by the pump wave, and in turn the pumping wave is induced by the incident wave When the energy-flux density of the excited SH wave is much ... MWcm2 , corresponding to a magnetic amplitude of 16G in the incident wave In the figures for numerical results, we use dotted lines to show linear results and solid lines to show nonlinear results...

Ngày tải lên: 19/06/2014, 21:20

... zero or an imaginary number In this situation, the backward wave as the reflection wave is the most intense and equal in intensity to the forward wave The interference of the two waves at the bottom ... backward waves satisfies   2k (k is an integer) at Nonlinear Propagation of Electromagnetic Waves in Antiferromagnet 91 the surface, the interference results in the peaks of Rs Thus the interference ... Trains, Phys Rev B, Vol.37, (1988), pp.8072-8081 Klingshirn, C F (1997), Chapter3, In: Semiconductor Optics, Springer, Berlin Lighthill, M J.(1965) Contributions to the Theory of Waves in Nonlinear...

Ngày tải lên: 19/06/2014, 21:20

... media), wave propagation through infinite media is practically modeled in a finite grid To model the infinity of the flow or wave propagation through the required infinite media by the finite number ... than in air or in other less complex media This chapter will explain fundamentals of the numerical modeling of EM wave propagation and scattering in soil through solving Maxwell’s equations using ... transmitting and receiving antennae increases, the radar wave amplitude attenuates, which creates greater difficulty in distinguishing the wave from background noises) (ITRC, 2000) Therefore, in this...

Ngày tải lên: 19/06/2014, 21:20

... Results are shown in Fig 130 Electromagnetic Waves Propagation in Complex Matter (a) (b) 131 Electromagnetic Waves in Contaminated Soils (c) (d) 132 Electromagnetic Waves Propagation in Complex Matter ... sites For example, in a non-dispersive medium, linear enlargement of the size can be simply interpreted to a linear increase in the wavelength and decrease in the frequency However, in a dispersive ... transmitting antenna The scattered field is comparable to the incident field in this case This potential can also be demonstrated in a different form as shown in Fig Electromagnetic Waves in Contaminated...

Ngày tải lên: 19/06/2014, 21:20