Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Wave methods"”.
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Asymptotic wave methods in heterogeneous media
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1985.
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Nondestructive Evaluation/characterization of Airport Pavements Using Stress Wave Methods
Energy-related processes in engineering systems and materials are numerous and may collectively describe most meaningful mechanical and physical features of the material/system. Those features may be retrieved using single, or ensemble-averaged, impulse-generated NDE tests using the methodology …
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The potential of sonic wave propagation in engineering rock classification
Sonic wave methods can be used to provide information on the engineering properties of rocks. The advantages of such techniques include minimal sample preparation, fast site preparation for field tests, reproducible and nondestructive tests, and capability for large scale testing. During this …
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Development of Deep Site Specific and Reference Shear Wave Velocity Profiles in the Canterbury Plains, New Zealand
<p>Deep (typically >1000 m) shear wave velocity profiles were developed across the Canterbury basin at nine strong motion stations using a combination of active and passive surface wave methods and horizontal to vertical spectral ratio measurements. A multi-mode, multi-method joint inversion …
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Signal integrity analysis of high-speed multilayer interconnects using the finite element method
… based on circuit-parameter extractions and full-wave methods based on solving Maxwell's equations. Even though computationally efficient, the approaches based on circuit-parameter extractions fail to provide accurate predictions due to the increased coupling and radiation effects at high …
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Optimizing GPU Performance in Cylindrical FDTD Simulations
… and large physical dimensions. Traditional full-wave methods, such as finite-difference time-domain (FDTD), become infeasible for such problems due to excessive memory and runtime requirements. To address this, several approximate techniques have been developed, including the localized …
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Development of Structural Health Monitoring Systems Incorporating Acoustic Emission Detection for Spacecraft and Wind Turbine Blades
… SHM systems employing the impedance and the Lamb wave methods. An acoustic emission sensor of the proposed system continuously monitors acoustic events, while the SHM system is in sleep mode. The SHM system is evoked to perform the SHM operation only when there is an acoustic event detected by the …
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Orbital-free density functional theory using higher-order finite differences
… implementations of OF-DFT employ the plane-wave basis, the global nature of the basis prevents the efficient use of modern high-performance computer architectures. We present a real-space formulation and higher-order finite-difference implementation of periodic Orbital-free Density …
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High flow nasal oxygen in resource constrained, non-intensive care high care wards for COVID-19 acute hypoxaemic respiratory failure: comparing outcomes of first versus third waves
… outcomes would be better in the third COVID wave (irrespective of differences in variant virulence; ancestral vs delta) due to increased institutional experience and capacity for HNFO and more restrictive admission criteria for respiratory high care wards and ICU dictated by the higher case …
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Development and modelling of new wideband microstrip patch antennas with capacitive feed probes
… easy to design and optimise. The use of full-wave methods for an accurate analysis of microstrip antennas, has basically become standard practice. These methods can become very demanding in terms of computational resources, especially when large antenna arrays have to be analysed. As such, …
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Predicting surface water profiles in sand
Electromagnetic (EM) wave methods are used in many civil engineering applications for non-destructive investigations such as locating reinforcing steel and voids in concrete, sinkholes, buried utilities, the groundwater table, seepage through dams and determining the thickness of pavements. All of …
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The Effect of Zr-Doping and Crystallite Size on the Mechanical Properties of TiO2 Rutile and Anatase
… were performed using the projector augmented wave and the linear augmented plane wave methods along with local density approximation (LDA) and two types of generalized gradient approximations (GGA), using the formulations by Perdew, Bunge and Enzerhoff, referred to as PBE, and by Wu and Cohen, …
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Computational modeling and simulation of nonlinear electromagnetic and multiphysics problems
… simulated using various three-dimensional full-wave methods in the time domain. The problems under consideration fall into two categories. One is nonlinear electromagnetic problems with the nonlinearity embedded in either the permeability or the conductivity of the material's constitutive …