elastic wave propagation in solids

... 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 7. 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 ... first intuitive approach consists in a tessellation of the curved geometry into multiple planar facets, as proposed in [10]. However, the surfaces’ curvature is not taken into account in this kind...

Ngày tải lên: 18/06/2014, 22:20

Ngày tải lên: 20/06/2014, 04:20

Ngày tải lên: 20/06/2014, 21:20

... disorders including Creutzfeldt-Jakob disease in humans, scrapie in sheep, chronic wasting disease in cervids, and bovine spongiform encephalopathy in cattle. The only known component of the infectious ... PrP Sc since the original PrP Sc seeds were diluted beyond the minimum infectious level. Although infectious, the in vitro generated PrP Sc product exhibited longer incubation periods in ani- mals ... autocatalytic induc- tion of PrP C conversion in a reaction originally devoid of PrP Sc makes this system more relevant to the in vivo setting representing sporadic prion diseases. In addi- tion,...

Ngày tải lên: 03/11/2012, 11:52

... using human defined symbols, operators, and languages. One of such fascinating examples is the Maxwell’s equations for electromagnetic waves. Having a good understanding of waves and wave propagation ... Chapter 1 Shear Wave Propagation in Soft Tissue and Ultrasound Vibrometry 1 Yi Zheng, Xin Chen, Aiping Yao, Haoming Lin, Yuanyuan Shen, Ying Zhu, Minhua Lu, Tianfu Wang and Siping Chen Chapter ... of shear wave having E = 7.5 kpa and η = 6 pa.s in Voigt tissue Figure 5. Zener model adds an elastic spring E1 to the Maxwell model (η, E2) in parallel. Shear Wave Propagation in Soft Tissue...

Ngày tải lên: 15/03/2014, 23:20

... solutions can be freely combined, since the summary will not lose any information in that case. CONSTRAINT PROPAGATION Like the Kimmo machinery, the constraint -propagation machinery is concerned with ... uncertain whether the constraint -propagation method enjoys an advanlage on serial machines. It is clear that the Kimmo machinery does combinatorial search while the constraint -propagation machinery ... structure. We have begun exploring such methods in a prelim- inary and approximate way by implementing a modular, non-searching constraint -propagation algorithm (see Win- ston (1984) and other...

Ngày tải lên: 17/03/2014, 20:20

... 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 ... simulate the wave transformation, including wave breaking, wave runup on the beach, and turbulence generated by  wave breaking and shear. As the model is a depth‐integrated, two‐dimensional in thehorizontaldirections, the ... model, 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,...

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 ... a slight indirect 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. ... important role in flood defense by dissipating incoming wave energy and reducing the erosion rates (Hong et al., 1993; Wu et al., 2000). However, physical processes of wave attenuation in mangroves...

Ngày tải lên: 03/04/2014, 12:22

Ngày tải lên: 24/04/2014, 17:23

... Coherent Input 51 4.1.3 Multi-Mode Incoherent Input 51 4.2 Coupled Power Equations—Two-Mode Case 52 4.2.1 Single-Mode Input 52 4.2.2 Two-Mode Coherent Input 55 4.2.3 Two-Mode Incoherent Input 58 4.3 ... This result has the following physical interpretation. As the coupling becomes larger over a shorter length of guide, in such a way that the integrated cou- pling remains constant, the length ... arising from the geometric and material imperfections of the physical sys- tems. Our task in following chapters is to determine transmission statistics in terms of coupling coefficient and/or propagation...

Ngày tải lên: 24/04/2014, 17:23

Ngày tải lên: 13/05/2014, 09:18

... transmission line an input impedance insensitive to frequency variations up to 5:1. It maintains a power gain above 9 dB anywhere within a 2:1 frequency variation. At the design-center frequency, a gain ... manual tuning feature is useful when a failure occurs in the automatic tuning circuitry. Tuning can also be done without the use of rf power (silent tuning). This method is useful in installations where ... of the space surrounding it. The area behind the flashlight remains unlit, while the area in front and to either side is illuminated. MAJOR AND MINOR LOBES The pattern shown in figure 2-7, view...

Ngày tải lên: 27/05/2014, 02:43

... 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 ... 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 and dispersive soil medium (in both dry ... are verifiedexperimentally.  Soilisacomplex,potentiallyheterogeneous,lossy,anddispersivematerial.Propaga‐ tionandscatteringofelectromagneticwaves in soilis, hence,morechallengingthan air or other less complex media. Chapter 5 explains the fundamentals of m odeling electromagnetic wave propagation and...

Ngày tải lên: 19/06/2014, 21:20

... si(k n r  + k 0 x)   , (46) where integral cosine and integral sine functions are defined by the following formulae: Ci (z)=γ + ln(z)+  z 0 cos(t) −1 t dt,si (z)=  z 0 sin(t) t dt − π 2 (47) and Euler ... (51) 10 Electromagnetic Waves Propagation in Complex Matter 14 Electromagnetic Waves (a) Case r = 3 (b) View in meridian surface r = 3, ϕ = π/2 (c) Case at r = 9 (d) View in meridian surface r ... surfaces, surrounding the radiating magnetic dipole, remains constant, which means that energy conservation is preserved with high numerical accuracy. 16 Electromagnetic Waves Propagation in Complex...

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 ... 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 ... 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 Fredholm- type singular integral...

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 ... 3 Nonlinear Propagation of Electromagnetic Waves in Antiferromagnet Xuan-Zhang Wang and Hua Li School of Physics and Electronic Engineering, Harbin Normal University China 1. Introduction ... of investigating dynamic properties and magneto-optical properties. In this section, the main steps and Electromagnetic Waves Propagation in Complex Matter 48 appear in the case of going...

Ngày tải lên: 19/06/2014, 21:20

Ngày tải lên: 19/06/2014, 21:20

Ngày tải lên: 19/06/2014, 21:20

Ngày tải lên: 19/06/2014, 21:20