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 18 of 18 for “"Artificial Structures"”.
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Dynamic plasma photonic crystals: multidimensional electromagnetically active artificial structures in the mm-wave and thz regimes
… crystal (PC) applications. Photonic crystals are structures possessing periodic modulation in the refractive indices, enabling them to manipulate the flow of light, and form photonic bandgaps. As such, photonic crystals are useful in numerous applications that require the precise control of …
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The Role of Artificial Structures in Facilitating Range Expansion of the Introduced Barnacle Megabalanus Coccopoma in the Southeastern U.S.A.
… sources. I investigated the hypothesis that artificial structures (i.e., buoys, towers), occurring far enough offshore of Georgia for water temperatures to be moderated by the Gulf Stream, provide refuges for breeding adults of <em>M. coccopoma</em> and can serve as the larval source. I …
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The ecology and ecological enhancement of artificial coastal structures.
… storm frequency and coastal urbanisation, artificial coastal structures are proliferating worldwide. It is now vital to understand the impact that artificial structures are having on the marine environment and it is becoming increasingly necessary to incorporate ecologically enhanced …
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The effects of an invasive species on the structure of native ecosystems
… species within Lough Hyne marine reserve and on artificial structures surveyed in south-west Ireland. Despite this dominance, native barnacle species continue to persist both in the marine reserve and on artificial structures of varying ages. The continuous production of broods is a key factor in …
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Eco-engineering of coastal infrastructure: A design for life
Coastal urbanisation has driven humans to build artificial defences to protect infrastructure from rising sea level, erosion and stormier seas. Artificial structures are proliferating in the coastal and marine environments (“ocean sprawl”), resulting in a loss of natural habitat, species diversity …
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Eco-geomorphological and hydrodynamic analysis of Mediterranean microtidal beaches in Southern Sardinia
… (natural or influenced by the presence of artificial structures), providing an estimation of their level of embaymentisation and the prevailing hydrodynamic circulation in the surf zone. In addition, the spatio-temporal variation of the shorelines was investigated to estimate the accretion …
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Evaluation of Giant Canada Goose Restoration in Western South Dakota
… shore sites contained over half of the nests and artificial structures were also used. Of the 82 nest observed, 85 percent were in ungrazed areas. Nests on land were found an average of 27 feet from water and 68 percent were within 15 feet. The mean elevation above water was 3.4 feet for all …
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How Historic Shipwrecks Influence Dispersal of Deep-Sea Microbiomes
… impacting dispersal of microbiomes around artificial structures in the ocean and how they connect to other deep-sea habitats is unknown. Dispersal processes are explained for some macroorganisms by theories in ecology, specifically the Theory of Island Biogeography and the Wooden Stepping …
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Quantifying biotic interactions with inshore subtidal structures: comparisons between artificial and natural reefs
Artificial reefs have been deployed purposely worldwide to influence physical and biological processes around coastlines and in inshore waters; often to augment recreational diving and fishing, support environmental mitigation and habitat restoration and, more recently, for scientific research. The …
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Practical electron cloaking in solids
… past decade has opened up new venues to obtain artificial materials with exotic properties that are desirable but not commonly encountered in the nature. Optical metamaterials have shown great potentials in applications such as optoelectronics, subwavelength imaging, and optical information …
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SCAPHIRHYNCHUS STURGEON EARLY-LIFE HISTORY
… sturgeon catch rates were highest around artificial structures (i.e., wing dikes) and island areas while main channel habitat comprised the lowest catch rates. Within these habitats, young sturgeon frequently occupied low velocities (i.e., ~0.1), moderate depths (i.e., 2 to 5 m), and sand …
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Metamaterial enhanced coupling
… normally found in nature. This is because these artificial structures display a strong electromagnetic response as a result of their geometry, as opposed to their chemistry, and that response typically dominates that of the substrate they are placed on. As a result, metamaterials can couple free …
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A study of the molecular mechanics of wood cell walls
… Every advantageous feature of wood as used in artificial structures is rooted in the plant's evolved capability to withstand the conditions of its survival: specifically wind and gravity loads. Wood resists these load types with remarkable efficiency with performance comparable to structural …
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An examination of facilitative interactions between shrubs and local desert organisms within the desert ecosystems of southern California
… associations could be replicated with artificial structures (Chapter 6). Mimics were deployed within California drylands. Camera traps were utilized to estimate vertebrate communities, with temperature pendants used to contrast microclimates. Shrubs and mimics had similar microclimates, …
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Theory, Simulation, Fabrication and Testing of Double Negative and Epsilon Near Zero Metamaterials for Microwave Applications
<p>Natural structures exhibiting simultaneous negative bulk permittivity and permeability have not yet been discovered. However, research interest over the past five years has grown with the proposition that artificial structures exhibiting these properties are realizable using specially-designed …
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Geraniaceae seed-inspired soft robots for environmental actuation and sensing
… beneficial fusion of form and function, these artificial structures emulate the awe-inspiring mechanisms of seed dispersal. Delving deeper into the domain of soft robotics, this research unfolds the potential of hygroscopic actuators, harnessing the latent energy of moisture as a fundamental …
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Comportamiento funcional y ambiental de los diques exentos de baja cota de coronación y su importancia en la ingeniería de costas
… los diques exentos. Los diques exentos son obras artificiales inspiradas en el funcionamiento de formaciones naturales que existen en el litoral, paralelas generalmente a la orilla, que protegen de la acción del oleaje un determinado tramo, y que son capaces de crear zonas de acreción en la costa. …
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Managing complexity in high-concentration flow modelling aimed at hazard assessment: numerical and practical aspects
… characteristic terrain shapes, buildings, infrastructures, embankments and mitigation structures. A believable representation of these geometrical constraints may be fulfilled acting on the computational mesh used to solve model equations, preferably avoiding regular Cartesian meshes. In this …