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Дисертації з теми "Wave impact"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 1 лютого 2022

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1

Md, Noar Nor. "Wave impacts on rectangular structures." Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/6609.

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There is a good deal of uncertainty and sensitivity in the results for wave impact. In a practical situation, many parameters such as the wave climate will not be known with any accuracy especially the frequency and severity of wave breaking. Even if the wave spectrum is known, this is usually recorded offshore, requiring same sort of (linear) transfer function to estimate the wave climate at the seawall. What is more, the higher spectral moments will generally be unknown. Wave breaking, according to linear wave theory, is known to depend on the wave spectrum, see Srokosz (1986) and Greenhow (

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2

Katsidoniotaki, Eirini. "Extreme wave conditions and the impact on wave energy converters." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-441043.

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The amount of energy enclosed in ocean waves has been classified as one of the most promising renewable energy sources. Nowadays, different wave energy conversion (WEC) systems are being investigated, but only a few concepts have been operated in a sea environment. One of the largest challenges is to guarantee the offshore survivability of the devices in extreme wave conditions. However, there are large uncertainties related to the prediction of extreme wave loads on WECs. Highfidelity computational fluid dynamics (CFD) simulations can resolve nonlinear hydrodynamic effects associated with wa

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3

Topliss, Margaret E. "Water wave impact on structures." Thesis, University of Bristol, 1994. http://hdl.handle.net/1983/2fa7ba69-7867-4cd0-8b3a-de4de97f98db.

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4

Wood, Deborah Jane. "Pressure-impulse impact problems and plunging wave jet impact." Thesis, University of Bristol, 1997. http://hdl.handle.net/1983/c3dbd4c5-5082-4c71-a16e-3daa969e22ee.

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5

Cox, Simon John. "Pressure impulses caused by wave impact." Thesis, University of East Anglia, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266731.

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6

Abdolmaleki, Kourosh. "Modelling of wave impact on offshore structures." University of Western Australia. School of Mechanical Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0055.

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[Truncated abstract] The hydrodynamics of wave impact on offshore structures is not well understood. Wave impacts often involve large deformations of water free-surface. Therefore, a wave impact problem is usually combined with a free-surface problem. The complexity is expanded when the body exposed to a wave impact is allowed to move. The nonlinear interactions between a moving body and fluid is a complicated process that has been a dilemma in the engineering design of offshore and coastal structures for a long time. This thesis used experimental and numerical means to develop further underst

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7

Abraham, Aliza Opila. "Extreme wave impact on a flexible plate." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104117.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 99-102).<br>This thesis describes the use of a combination of various visual techniques to characterize the flow-structure interaction of a breaking wave impacting a flexible vertically mounted plate. Several experiments were conducted on a simulat

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8

Schöpfer, Philipp. "Non-linear Wave Impact on Monopile Structures." Thesis, KTH, Lättkonstruktioner, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-203342.

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This Master Thesis deals with non-linear wave impacts on monopile structures by introducing a potential flow solver named OceanWave3D (OCW3D) for simulating free surface waves and their kinematics under engineering consideration. A comparison to Rambøll’s analytical tool WAVGEN is conducted with the aim of providing distinct recommendations on the application and suitability of both programs for the monopile design. As WAVGEN applies common wave theories it is able to generate single waves in linear or non-linear form but only linear irregular sea states. In contrary, OCW3D includes both the n

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9

Rimal, Nischal. "Impact Localization Using Lamb Wave and Spiral FSAT." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1388672483.

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10

Bradshaw, Douglas Robert Saunders. "Linear wave propagation in traumatic brain injury." Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341646.

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11

Greenwood, Charles. "The impact of large scale wave energy converter farms on the regional wave climate." Thesis, University of the Highlands and Islands, 2016. https://pure.uhi.ac.uk/portal/en/studentthesis/the-impact-of-large-scale-wave-energy-converter-farms-on-the-regional-wave-climate(e734db00-2108-48f9-b162-a1fc85ef61d6).html.

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12

Musa, Abu Bakar. "Wave motion and impact effects in viscoelastic rods." Thesis, Loughborough University, 2005. https://dspace.lboro.ac.uk/2134/10799.

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Two separate problems are to be investigated in this thesis. The first problem is the propagation of waves through a short rod (or slug) of viscoelastic material. The second problem is the study of impact of a short viscoelastic rod (or slug) on a stationary semi-infinite viscoelastic. rod. The viscoelastic materials are modelled as standard linear solids which involve 3 material parameters and the motion is treated. as one-dimensional. For the first study, a viscoelastic slug is placed between two semi-infinite elastic rods and a wave initiated in the first rod is transmitted through the slug

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13

Yang, Yongqian. "Impact of Patchy Vegetation on Wave and Runup Dynamics." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/72278.

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Coastal regions are vulnerable to various natural processes, ranging from normal waves to extreme events. Given the flourishing development and large population along coastlines, various measures have been taken to mitigate the water-induced damage. Nature-based coastal protection, especially vegetation, has attracted unprecedented studies over the past two decades. To enhance understanding of this subject, this dissertation evaluates the impact of patchy vegetation on wave and runup dynamics along coastlines. Selecting from a prototype in Dalehite Cove, Galveston Bay, TX, results from a Bouss

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14

Tan, Loh Teng Young. "Assessments of wave-structure interactions for an oscillating wave surge converter using CFD." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/12230.

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This thesis is concerned with the use of the open source computational fluid dynamics (CFD) software package, OpenFOAM® for predicting and analysing the behaviour of a near-shore oscillating wave surge converter (OWSC), when subject to various types of ocean wave conditions in a numerical wave tank (NWT). OpenFOAM® which utilises a Finite Volume Method (FVM) is used to solve the incompressible, Reynolds Averaged Navier-Stokes (RANS) equations for a two-phase fluid, based on a Volume of Fluid (VOF) phase-fraction approach to capture the interface between the air and water phases. Preliminary st

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15

Hull, P. "Wave impact loading and its effects on blockwork structures." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246333.

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16

Khan, Md Mahfujul H. "Understanding Impact Load Wave Transmission Performance of Elastic Metamaterials." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1479146177020136.

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17

Siddiq, Kashif. "The impact of oscillator phase noise on the design of millimetre-wave continuous wave radar systems." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760876.

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This PhD thesis focuses on quantifying the impact of oscillator phase noise on the design of MMW CW radar systems with the goal of optimising the system to achieve better target detection and tracking. Phase noise in the transmitters of radar systems is known to distort the target response by broadening the linewidth and raising the noise floor of radar systems when a strong scatterer is present in the scene, hence degrading the detection and tracking performance. The situation is worse when multiple large scatterers are present, as the noise sidebands of all scatterers superimpose causing sma

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18

Mai, Trí Cao. "On the role of aeration, elasticity and wave-structure interaction on hydrodynamic impact loading." Thesis, University of Plymouth, 2017. http://hdl.handle.net/10026.1/9884.

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Local and global loadings, which may cause the local damage and/or global failure and collapse of offshore structures and ships, are experimentally investigated in this study. The big research question is how the aeration of water and the elasticity of the structural section affect loading during severe environmental conditions. A further question is how the scattered waves from ships and offshore structures, the mooring line force and the structural response, which are known to affect local load and contribute to global load, will be affected by wave-structure interaction of a ship or offshor

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19

Zhou, Weiyu. "Crash-impact behavior of graphite/epoxy composite sine wave webs." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/12226.

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20

Smith, Helen Claire Margaret. "Modelling for resource and environmental impact assessments of wave farms." Thesis, University of Exeter, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445738.

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21

Dahlsten, Hilda. "Life Cycle Assessment of Electricity from Wave Power." Thesis, Institutionen för energi och teknik, SLU, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-162582.

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The use of ocean wave energy for electricity production has considerable potential, though it has proven to be difficult. A technology utilizing the heaving (up-and-down) motions of the waves was conceived at Uppsala University in the early 2000´s, and is being further developed for commercial use by Seabased Industry AB. The purpose of this master´s degree project was to increase the knowledge of the environmental performance of Seabased´s wave energy conversion concept and identifying possible areas of improvement. This was done by conducting a life cycle assessment (LCA) of a hypothetical p

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22

Ahmad, Sahrim Haji. "High strain-rate behaviour of polymers using blast-wave and impact loading methods." Thesis, Loughborough University, 1988. https://dspace.lboro.ac.uk/2134/7496.

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23

Menday, Roger. "The forced vibration of a partially delaminated beam." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/27082.

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The forced vibration of a partially delaminated structure such as an aircraft wing can result in catastrophic crack growth. In order to look at the underlying mechanism of the dynamics and failure of the material, a simplified model of a cantilever beam with a single delamination at its free end is considered. We investigate a number of aspects of this system, using mathematical models to gain insight into its behaviour.

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24

Tabatabaee, Ghomi Mohammad. "Impact wave process modeling and optimization in high energy rate explosive welding." Licentiate thesis, Mälardalen University, School of Sustainable Development of Society and Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-6663.

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<p>Impact waves are used in many different industries and are classified according to whether they cause plastic or elastic deformations. In the plastic deformation mode, these waves can be used to produce special electrical joints. In the elastic deformation mode, they can be used to detect leakage or to measure the thickness of pipes. Both modes have applications in offshore technology. In this thesis the application of impact waves in the plastic deformation mode and explosive welding are discussed. In the explosive welding (EXW) process a high velocity oblique impact produced by a carefull

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25

Winsor, Fraser N. "Methods for removing inertial force from measured wave impact force signals." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0021/MQ55546.pdf.

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26

Smith, Robert H. "Energy absorption of sine wave beams subjected to axial impact loading." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1181251105/.

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27

Aziz, Asim. "Impact dynamic rupture modelling of solids for shock wave lithotripsy simulation." Thesis, Glasgow Caledonian University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.688271.

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28

Olsson, Daniel. "Numerical simulations of energy absorbing boundaries for elastic wave propagation in thick concrete structures subjected to impact loading." Thesis, Umeå universitet, Institutionen för fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-58015.

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As many of the world’s nuclear power plants are near the end of their supposed life span a need arise to assess the components crucial to the safety of these plants. One of these crucial components is the concrete reactor confinement; to assess its condition, non-destructive testing (NDT) is an attractive method. Traditional testing of concrete structures has comprised of drilling out a sample and performing stress tests on it, but because of the radioactive environment inside the containment this method is far from ideal. NDT is of course possible to use at any structure but at reactor contai

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29

Kim, Ji-Eun. ""Korean wave" in China : its impact on the South Korean-Chinese relations." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/39363.

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The “Korean Wave” refers to the love of South Korean cultural products. The wave has started in East Asia and swept over Southeast Asia. More recently, it has even landed in the Middle East and part of Europe. In particular, this thesis looks at the Korean Wave in the context of China, where the Korean Wave first started and the term was coined. It aims to answer the following research questions: 1) To what extent the Korean pop culture has influenced the public sentiment in China? 2) How the government and political leaders have responded to the Korean Wave in China? In response, it is argued

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30

Villegas, Ruiz Eloy Ángel. "Wave aberrations in ophthalmic progressive power lenses and impact on visual quality." Doctoral thesis, Universidad de Murcia, 2009. http://hdl.handle.net/10803/10843.

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Las lentes progresivas (LP) para gafas es una solución muy extendida para la presbicia, ya que proporcionan una visión continua a todas las distancias debido a un cambio progresivo de potencia. En este trabajo se han medido las aberraciones de frente de onda espacialmente resueltas y la calidad visual en estas lentes. Además del astigmatismo que aumenta periféricamente, también se han encontrado pequeños valores de aberraciones de tercer orden, coma y trefoil, que producen un bajo deterioro de la calidad óptica y visual. El logaritmo de métricas sobre la PSF del sistema lente con ojo son las q

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31

Martínez, Asensio Adrián. "Impact of large-scale atmospheric variability on sea level and wave climate." Doctoral thesis, Universitat de les Illes Balears, 2015. http://hdl.handle.net/10803/371456.

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This thesis aims at quantitatively characterizing the recent (last few decades) and future climate variability of marine climate in the Western Mediterranean Sea and the North Atlantic Ocean. Namely it focuses on sea level and wind-waves, as these are the variables with a larger potential impact on coastal ecosystems and infrastructures. We first use buoy and altimetry data to calibrate a 50-year wind-wave hindcast over the Western Mediterranean in order to obtain the best characterization of the wave climate over that region. The minimization of the differences with respect to observations th

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32

Walters, Mark Bernhardt James. "An experimental study into impact wave propagation in cross ply composite plates." Thesis, University of Leicester, 1994. http://hdl.handle.net/2381/34719.

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To gain insight into the problem of impact on to composite materials this work has examined experimentally the characteristics of stress waves propagating through a multi layered plate due to a surface impact. Theoretical and numerical techniques have been developed for an impulsive line load acting on the upper surface of a four layer cross ply plate. These resolve the surface and inter lamina disturbances caused by the passing stress waves due to a normal line impulse onto a plate. The objective of this work was to examine the wave propagation in a cross ply plate with experimental technique

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33

Protic, Serena. "The impact of fourth wave feminism: Using social media as a feminist resource." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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There is little doubt that the Internet, and especially social media, has revolutionised our lives, transforming the way in which we communicate (Liveperson 2017), read the news (Pew Research Center 2016), shop and conduct business (Deloitte 2015), work (Zetterstrom 2012) and even find love (Pew Research Center 2015). The Internet has had an impact on feminism as well, revolutionising the way feminists participate in political and cultural activism and contributing to the creation of a fourth feminist wave. Thanks to the Internet, virtually anybody who has access to it can become an activist

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34

Mishra, Vijay. "Impact of Hurricanes on Structures - A Performance Based Engineering View." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3251.

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The magnitude of damage caused to the United States (US) coast due to hurricanes has increased significantly in the last decade. During the period 2004-2005, the US experienced seven of the costliest hurricanes in the country's history (NWS TPC-5, 2007) leading to an estimated loss of ~ $158 billion. The present method for predicting hurricane losses, HAZUS (HAZard US), is solely based on hurricane hazard and damage caused to building envelopes only and not to structural systems (Vickery et al., 2006). This method does not take into account an intermediate step that allows for better damage es

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35

Tabatabaee, Ghomi Mohammad. "MODELLING AND SIMULATION OF ELASTIC & PLASTIC BEHAVIOUR OF PROPAGATING IMPACT WAVE : Impact- echo and Explosive welding process development." Doctoral thesis, Mälardalens högskola, Akademin för hållbar samhälls- och teknikutveckling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-13332.

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A force that is applied dynamically in a short period of time is called an impact force (shock wave). Due to the concentrated application of force on a small area in a fraction of a second, unique applications have emerged that other types of loadings are not capable of performing. Explosions, an impact of a hammer, impact of waves on a shore wall, or the collision of two automobiles are examples where impact waves occur. In this research the effects of impact on solid materials and the motion of stress waves due to the impact are studied and some of their industrial applications are described

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36

Banfi, Davide. "A field and laboratory study on the dynamic response of the Eddystone lighthouse to wave loading." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/11607.

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Because little was known about how the masonry lighthouses constructed during the 19th century at exposed locations around the British Isles were responding to wave action, the dynamic response of the Eddystone lighthouse under wave impacts was investigated. Like other so called 'rock lighthouses', the Eddystone lighthouse was built on top of a steep reef at a site that is fully submerged at most states of the tide. Consequently, the structure is exposed to loading by unbroken, breaking and broken waves. When the breaking occurs, wave loading leads to complex phenomena that cannot be described

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37

Wolters, G. "Characteristics of wave impact induced pressure pulse propagation into cracks of coastal structures." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419521.

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38

Mousavi, Saed. "Identification of Viscoelastic Materials by Use of Wave Propagation Methods." Doctoral thesis, Uppsala universitet, Hållfasthetslära, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8324.

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Complex moduli and Poisson’s ratio have been estimated using extensional and torsional wave experiments. The data were used for assessment of linearity and isotropy of two polymers, polymethyl methacrylate (PMMA) and polypropylene (PP). The responses of both materials were found to be close to linear and isotropic. A statistical analysis of different estimation approaches for complex modulus and Poisson’s ratio was conducted. It was shown that a joint estimation of complex modulus and Poisson’s ratio improves the estimated results. Considerable improvement was achieved in the frequency range 5

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39

Robertson, A. W. "The impact of wind on a balsam fir wave forest at Spirity Cove, Newfoundland." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233583.

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40

Li, Guojing. "Development of a wireless instrumented projectile for impact testing based on elastic wave reduction." Diss., Connect to online resource - MSU authorized users, 2008.

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41

Samtleben, Nadja, and Ch Jacobi. "Impact of intermittent gravity wave activity on the middle atmospheric circulation during boreal winter." Universität Leipzig, 2018. https://ul.qucosa.de/id/qucosa%3A31793.

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Simulations of the circulation in the middle atmosphere during northern winter performed with a nonlinear, mechanistic, global circulation model show that the upper mesospheric jet is greatly overestimated and also the position with respect to latitude and height does not correspond to observations. Apart from that also the winter wind reversal in the mesopause region, evoked by breaking gravity waves (GWs), is located too low around 80km, but is observed to be usually around 100 km. These discrepancies are planned to be eliminated by modifying the distribution of GW amplitudes driving the GW

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42

Reid, Terry Vincent. "A Computational Approach For Investigating Unsteady Turbine Heat Transfer Due To Shock Wave Impact." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/25983.

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The effects of shock wave impact on unsteady turbine heat transfer are investigated. A numerical approach is developed to simulate the flow physics present in a previously performed unsteady wind tunnel experiment. The windtunnel experiment included unheated and heated flows over a cascade of highly loaded turbine blades. After the flow over the blades was established, a single shock with a pressure ratio of 1.1 was introduced into the wind tunnel test section. A single blade was equipped with pressure transducers and heat flux microsensors. As the shock wave strikes the blade, time resolved

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43

Mackenzie, Graeme Douglas. "The shallow crustal structure of the Chicxulub impact crater from surface wave dispersion studies." Thesis, University of Leicester, 1999. http://hdl.handle.net/2381/30436.

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A surface wave dispersion study has been conducted on high frequency (0.5-5 Hz) crustal Rayleigh waves propagating across the 65 Ma. Chicxulub impact structure in Mexico. These were recorded on a 20 station seismic array deployed along 4 radial arms across the region and originated from nearby quarries within the array. Events originating from the same quarry were stacked prior to the application of a multiple filter technique to produce group velocity dispersion curves. Using a genetic algorithm several one-dimensional shear wave velocity-depth models have then been obtained through the optim

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44

Monges, Arnaud C. "Impact of the Madden-Julian oscillation over tropical South America During Austral summer." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/25784.

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45

Haikonen, Kalle. "Underwater radiated noise from Point Absorbing Wave Energy Converters : Noise Characteristics and Possible Environmental Effects." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-235016.

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The conversion of wave energy into electrical energy has the potential to become a clean and sustainable form of renewable energy conversion. However, like all forms of energy conversion it will inevitably have an impact on the marine environment, although not in the form of emissions of hazardous substances (gases, oils or chemicals associated with anticorrosion). Possible environmental issues associated with wave energy conversion include electromagnetic fields, alteration of sedimentation and hydrologic regimes and underwater radiated noise. Underwater noise has the potential to propagate o

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Bramberger, Martina [Verfasser], and Markus [Akademischer Betreuer] Rapp. "Mountain wave impact on flight conditions of high-flying aircraft / Martina Bramberger ; Betreuer: Markus Rapp." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1188564285/34.

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Weeks, Hoi Ping. "The molecular and cellular impact of wave interactions on the aggressiveness of PC-3 cells." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/70578/.

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The metastatic spread of cancer cells to distant sites in the body accounts for the majority of cancer-related death and significantly decreases patient survival. Whilst cell migration is a physiologically important process, when uncontrolled, it can be a contributing factor to the metastatic phenotype. Actin polymerisation enables the dynamic restructuring of the cytoskeleton which is fundamental to cell migration and is stimulated by the Arp (actin-related protein) 2/3 protein complex which in turn is activated by members of the WAVE (WASP Verprolin homologous protein) family. WAVE1 and 3 ex

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Nikulin, Grigory. "Impact of Rossby waves on ozone distribution and dynamics of the stratosphere and troposphere." Doctoral thesis, Kiruna : Swedish institute of Space Physics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-596.

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Yang, Mijia. "IMPACT MECHANICS OF ELASTIC AND ELASTIC-PLASTIC SANDWICH STRUCTURES." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1142444606.

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Langhamer, Olivia. "Wave energy conversion and the marine environment : Colonization patterns and habitat dynamics." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-107193.

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A wave energy park has been established on the Swedish west coast outside Lysekil and pioneer work about its interactions with the marine environment has been conducted. So far, little is known about the effects of offshore energy installations on the marine environment, and this thesis assists in minimizing environmental risks as well as in enhancing potential positive effects on the marine environment. The Lysekil research site is situated about two kilometres offshore and has been under development since 2005. During this time 26 “environmental devices”, without generators, consisting of a

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