نتایج جستجو برای: rayleigh wave fundamental mode dispersion curves using single

تعداد نتایج: 4497732  

2006
Yuh-Sien Sun Chau Yuan-Fong Tsai Din-Ping

The two dimensional with a triangular-lattice cross sectional pattern of elliptic air holes photonic crystal fiber (PCF) is investigated in detail by use of plan wave expansion (PWE) method. Using PWE method, the dependence of dispersion on structure parameters is calculated. We compared the dispersion relations between the circular air holes PCF and the elliptic one. We find that the flatter d...

Journal: :Geophysical Research Letters 2021

Abstract We develop a data‐driven clustering method to evaluate velocity model using surface wave dispersion. This is done by first computing theoretical dispersion curves for 1‐D profiles of all the grid locations and then splitting resulting into certain number groups via K‐means clustering. The observed are also clustered following same procedure assessed comparing spatial patterns obtained ...

Journal: :Optics express 2006
Shailendra K Varshney Takeshi Fujisawa Kunimasa Saitoh Masanori Koshiba

This paper presents an optimized design of a dispersion compensating photonic crystal fiber (PCF) to achieve gain-flattened Raman performances over S-band using a single pump. Genetic algorithm interfaced with an efficient full-vectorial finite element modal solver based on curvilinear edge/nodal elements is used as an optimization tool for an accurate determination of PCF design parameters. Th...

2008
Xiaodong Song Xinlei Sun Sihua Zheng Zhen Xu Yingjie Yang Michael H. Ritzwoller

We perform ambient noise tomography of China using the data from the China National Seismic Network and surrounding global and PASSCAL stations. The results so far are summarized below. (1) Dispersion measurements and tomography. For most of the station pairs, we retrieve good Rayleigh waveforms from ambient noise correlations using 18-months of continuous data at all distance ranges across the...

2005
GEORGE GAZETAS

The paper studies certain dynamic characteristics of soil deposits with wave velocities increasing with depth according to (l+pz)'", where m = 1, 2/3, 1/2, 1/4 and 0. Analytical solutions are presented for the fundamental periods, mode shapes and amplification functions due to vertically propagating shear waves and the effects of type (m) and rate ( p ) of heterogeneity are systematically inves...

2001
L. I. Slepyan

Wave con2gurations for modes I and II of crack propagation in an elastic triangular-cell lattice are studied. [Mode III was considered in Part I of the paper: Slepyan, L.I. Feeding and dissipative waves in fracture and phase transition. I. Some 1D structures and a square-cell lattice. J. Mech. Phys. Solids 49 (2001) 469.] A general solution incorporates a complete set of the feeding and dissipa...

The stress wave propagation in a generalized thermoelastic polygonal plate of inner and outer cross sections is studied using the Fourier expansion collocation method. The wave equation of motion based on two-dimensional theory of elasticity is applied under the plane strain assumption of generalized thermoelastic plate of polygonal shape, composed of homogeneous isotropic material.  The freque...

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