You searched for subject:(Marine structures).
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Delft University of Technology
1.
Troost, Niels (author).
Confused sea-state induced fatigue: Joint swell and wind seas induced multiaxial stresses: the influence of confused sea-state induced multiaxial stress-states on fatigue damage of a USCG cutter.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:c845b412-cab2-4c14-b2be-7bc8fd03cd6d 
► Marine structures are mostly exposed to mild and moderate sea-states, where the structural response is elastic. Characteristics of environmental loading are highly stochastic in nature,…
(more)
▼ Marine structures are mostly exposed to mild and moderate sea-states, where the structural response is elastic. Characteristics of environmental loading are highly stochastic in nature, resulting in stress-states that might be multiaxial. This thesis attempts to identify the source and effect of these multiaxial stress-states on fatigue damage in frigate type structures. A stress invariant based method called the Projection-by-Projection approach was adopted to estimate damage in the presence of multiaxial stress-states. This method was tested for its applicability and modified, where necessary, to better cope with the encountered stress-states. The design rules by the International Institute of Welding (IIW) were also used to be able to distinguish physical phenomena from methodological properties. The available data consisted of strain measurements from the United States Coast Guard (USCG) Cutters Bertholf and Stratton. The Bertholf was equipped with the WaMoS wave radar. Measured wave data was reinforced with simulated waves to make the research independent of encountered sea-states. It was concluded that multiaxiality is most relevant at low damage estimates (i.e.: low wave). The governing influence factor is the incoming wave direction. It was also shown that multiaxial stress-states may significantly contribute to fatigue damage (up to a factor 2, depending on the structural detail and location in the vessel) at an estimated life time of 2 · 106 cycles.
Valid
Fatigue Lifetime Assessment Project
Advisors/Committee Members: Kaminski, Mirek (mentor), Sluijs, Lambertus J. (graduation committee), den Besten, Henk (graduation committee), van Lieshout, Paula (graduation committee), Bufalari, Gabriele (graduation committee), Hageman, R.B. (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Fatigue; multiaxial; marine structures
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APA (6th Edition):
Troost, N. (. (2017). Confused sea-state induced fatigue: Joint swell and wind seas induced multiaxial stresses: the influence of confused sea-state induced multiaxial stress-states on fatigue damage of a USCG cutter. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:c845b412-cab2-4c14-b2be-7bc8fd03cd6d
Chicago Manual of Style (16th Edition):
Troost, Niels (author). “Confused sea-state induced fatigue: Joint swell and wind seas induced multiaxial stresses: the influence of confused sea-state induced multiaxial stress-states on fatigue damage of a USCG cutter.” 2017. Masters Thesis, Delft University of Technology. Accessed March 04, 2021.
http://resolver.tudelft.nl/uuid:c845b412-cab2-4c14-b2be-7bc8fd03cd6d.
MLA Handbook (7th Edition):
Troost, Niels (author). “Confused sea-state induced fatigue: Joint swell and wind seas induced multiaxial stresses: the influence of confused sea-state induced multiaxial stress-states on fatigue damage of a USCG cutter.” 2017. Web. 04 Mar 2021.
Vancouver:
Troost N(. Confused sea-state induced fatigue: Joint swell and wind seas induced multiaxial stresses: the influence of confused sea-state induced multiaxial stress-states on fatigue damage of a USCG cutter. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 04].
Available from: http://resolver.tudelft.nl/uuid:c845b412-cab2-4c14-b2be-7bc8fd03cd6d.
Council of Science Editors:
Troost N(. Confused sea-state induced fatigue: Joint swell and wind seas induced multiaxial stresses: the influence of confused sea-state induced multiaxial stress-states on fatigue damage of a USCG cutter. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:c845b412-cab2-4c14-b2be-7bc8fd03cd6d
University of Aberdeen
2.
Miller, Raeanne Gwen.
Larval dispersal and population connectivity : implications for offshore renewable energy structures.
Degree: PhD, 2013, University of Aberdeen
URL: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=210224
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.606423
► The installation of marine renewable energy devices (MREDs) is progressing rapidly along many coastlines. It has been suggested that MRED arrays could provide stepping-stones for…
(more)
▼ The installation of marine renewable energy devices (MREDs) is progressing rapidly along many coastlines. It has been suggested that MRED arrays could provide stepping-stones for larval dispersal, mediating species range expansions or invasions. As common members of hard-substrate fouling communities and likely colonisers of MREDs, the larval dispersal processes of barnacles (Cirripedia: Thoracia) in the Firth of Lorn (Scotland) are assessed at scales ranging from mm to 10s – 100s km. At the scale of the organism itself, significant differences in larval mass densities and sinking velocities were observed between species of cirripedes, suggesting that larval physiology and morphology play an important role in water column vertical positioning. The importance of vertical positioning to horizontal transport and dispersal of larvae was identified in field surveys of the horizontal and vertical distributions of cirripede larvae, which revealed the interplay of wind-driven and tidally-oscillating currents in determining transport distances. Numerical simulations of larval dispersal based on a threedimensional hydrodynamic model then demonstrated that larvae with shallower abundance distributions often experienced greater horizontal transport, but that net dispersal distances were often greater for larvae deeper in the water column. Overall, simulated transport and dispersal distances were greatest for particles released at habitats further from the coast, such as MREDs, suggesting that the connectivity of these adult populations may be enhanced. Together, larval morphology, vertical positioning, and the coastal proximity of adult habitat could serve as useful indicators of larvae capable of reaching nearby newly installed offshore structures. For locations designated for MRED development in the Firth of Lorn, it is suggested that species with dispersal abilities similar to the cirripedes in this study could feasibly use these structures as stepping-stones for dispersal and range expansion, which could have important consequences when fouling communities are comprised of commercially important or invasive species.
Subjects/Keywords: 333.95; Renewable natural resources; Offshore structures; Marine resources conservation
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APA (6th Edition):
Miller, R. G. (2013). Larval dispersal and population connectivity : implications for offshore renewable energy structures. (Doctoral Dissertation). University of Aberdeen. Retrieved from http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=210224 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.606423
Chicago Manual of Style (16th Edition):
Miller, Raeanne Gwen. “Larval dispersal and population connectivity : implications for offshore renewable energy structures.” 2013. Doctoral Dissertation, University of Aberdeen. Accessed March 04, 2021.
http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=210224 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.606423.
MLA Handbook (7th Edition):
Miller, Raeanne Gwen. “Larval dispersal and population connectivity : implications for offshore renewable energy structures.” 2013. Web. 04 Mar 2021.
Vancouver:
Miller RG. Larval dispersal and population connectivity : implications for offshore renewable energy structures. [Internet] [Doctoral dissertation]. University of Aberdeen; 2013. [cited 2021 Mar 04].
Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=210224 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.606423.
Council of Science Editors:
Miller RG. Larval dispersal and population connectivity : implications for offshore renewable energy structures. [Doctoral Dissertation]. University of Aberdeen; 2013. Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=210224 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.606423
Delft University of Technology
3.
Seo, Ho Seung (author).
Fatigue of Welded Joints in Steel Marine Structures: Resistance of Double Sided Longitudinal Attachments and Single Sided Butt Joints ~ Design and Testing Considerations.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:066ec94f-fad0-4070-809c-398a782e9a43
► <p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph">Fatigue failure is a governing limit state for
marine structures.
Marine structures are composed of the numerous structural members connected by the welded…
(more)
▼ <p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph">Fatigue failure is a governing limit state for
marine structures.
Marine structures are composed of the numerous structural members connected by the welded joints which are the typically governing fatigue sensitive locations. In this thesis, attention has been paid to fatigue of welded joints from design and from testing perspective. The double sided longitudinal attachment is a common structural detail in
marine structures and available resistance information, SN data, has been used to investigate the life time estimate accuracy in case the total stress is adopted as fatigue damage criterion. The single sided butt joint is a common structural detail in
marine structures like steel catenary risers and a specimen has been designed for testing using the hexapod in order to ensure fatigue induced failure at the required location.<b>Fatigue design of double sided welded longitudinal attachments using a Total Stress criterion </b>The recently developed total stress concept considers both the weld notch and far field characteristic contributions. The total through-thickness weld notch stress distribution has been adopted to establish the total stress fatigue damage criterion and corresponding fatigue resistance curve. Thanks to a semi-analytical formulation, it is easy to determine the total weld notch stress distribution. The involved weld load carrying stress component is a characteristic one and unique for each weld notch location. A double weld element beam model has been developed to replace the original single weld finite element beam model in order to capture correct estimates for the double sided longitudinal attachments. Alternatively, a parametric has been established as well. The weld notch angle has turned out to be a governing parameter. Evaluation of the fatigue resistance of the welded double sided longitudinal attachment using the Total Stress concept shows a better accuracy in comparison to the nominal stress, hot spot structural stress and effective notch stress concept results. A governing factor for double sided longitudinal attachments is investigated which is the base plate thickness <i>t</i><sub><i>b</i></sub>. Although, the IIW classifies the longitudinal attachment based on the attachment length <i>l
a</i>, the base plate thickness <i>t
b</i> is much more dominant. <b>Fatigue testing of single sided butt joints using a Hexapod </b>The riser system forms a significant part of the development costs for floating offshore oil production facilities. The SCReen joint industry project aims to optimise the fatigue design and maintenance costs for Steel Catenary Risers (SCR’s). Generally, published fatigue resistance data of SCR welded joints are performed using resonance bending tests, which have two major limitations: a very high mean stress state and unrealistic variable amplitude loading. In order to obtain realistic fatigue resistance data, the SCReen project plans to do the fatigue tests with the…
Advisors/Committee Members: Kaminski, Mirek (graduation committee), den Besten, Henk (mentor), Popovich, Vera (graduation committee), Qin, Yanxin (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Fatigue resistance; Welded joint; Marine structures; Offshore structures; Hot spot stress; Total stress concept; S-N Curves
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APA ·
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APA (6th Edition):
Seo, H. S. (. (2019). Fatigue of Welded Joints in Steel Marine Structures: Resistance of Double Sided Longitudinal Attachments and Single Sided Butt Joints ~ Design and Testing Considerations. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:066ec94f-fad0-4070-809c-398a782e9a43
Chicago Manual of Style (16th Edition):
Seo, Ho Seung (author). “Fatigue of Welded Joints in Steel Marine Structures: Resistance of Double Sided Longitudinal Attachments and Single Sided Butt Joints ~ Design and Testing Considerations.” 2019. Masters Thesis, Delft University of Technology. Accessed March 04, 2021.
http://resolver.tudelft.nl/uuid:066ec94f-fad0-4070-809c-398a782e9a43.
MLA Handbook (7th Edition):
Seo, Ho Seung (author). “Fatigue of Welded Joints in Steel Marine Structures: Resistance of Double Sided Longitudinal Attachments and Single Sided Butt Joints ~ Design and Testing Considerations.” 2019. Web. 04 Mar 2021.
Vancouver:
Seo HS(. Fatigue of Welded Joints in Steel Marine Structures: Resistance of Double Sided Longitudinal Attachments and Single Sided Butt Joints ~ Design and Testing Considerations. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 04].
Available from: http://resolver.tudelft.nl/uuid:066ec94f-fad0-4070-809c-398a782e9a43.
Council of Science Editors:
Seo HS(. Fatigue of Welded Joints in Steel Marine Structures: Resistance of Double Sided Longitudinal Attachments and Single Sided Butt Joints ~ Design and Testing Considerations. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:066ec94f-fad0-4070-809c-398a782e9a43
University of Western Ontario
4.
Hill, Carolyn M.
Sedimentology, Lithostratigraphy and Geochronology of the Paleoproterozoic Gordon Lake Formation, Huronian Supergroup, Ontario, Canada.
Degree: 2019, University of Western Ontario
URL: https://ir.lib.uwo.ca/etd/6084
► The Gordon Lake Formation of the Paleoproterozoic Huronian Supergroup is a primarily-siliciclastic succession ranging from 300 to 1100 m thick. Lithostratigraphic and sedimentological analysis of…
(more)
▼ The Gordon Lake Formation of the Paleoproterozoic Huronian Supergroup is a primarily-siliciclastic succession ranging from 300 to 1100 m thick. Lithostratigraphic and sedimentological analysis of the formation in the Bruce Mines and Flack Lake areas, and Killarney and Lady Evelyn-Smoothwater provincial parks revealed 7 lithofacies, which comprise 3 distinct lithofacies associations. The lithofacies associations are subtidal nearshore, subtidal to shallow shelf, and mixed intertidal flat. Microbially-induced sedimentary structures (MISS) related to microbial mat destruction and decay were recognized in the Flack Lake area. The preserved MISS include sand cracks, mat chips, remnant gas domes, and pyrite patches, and iron laminae. A biological origin for the fossil structures is supported by their similarities to modern and ancient documented examples of MISS, the sand-dominated nature of the substrate in which they are preserved, and key microtextures identified in thin section. The identified MISS support the interpretation of a tidal flat depositional environment. The Gordon Lake Formation contains soft-sediment deformation structures (SSDS) in all four study areas. Identified SSDS include load casts, convolute bedding, pseudonodules, ball-and-pillow structures, flame structures, syn-sedimentary faults, and one dewatering pipe. The primary trigger mechanism is interpreted to be storm or tsunami activity, however seismic shock, overloading brought about by density inversions, or a combination of these processes, may have influenced the development of the structures to a lesser degree. Microbial mats may have played a minor role in the formation of the SSDS, but do not appear to have been a prominent driving mechanism. Detrital zircon U-Pb ages from a sandstone provide new evidence for the maximum depositional age of the formation and reinterpretation of the depositional history of the upper Huronian Supergroup. The average age of the youngest zircon grains constrains the age of deposition to sometime after 2315 ± 5 Ma, but prior to intrusion of gabbro (Nipissing) approximately 95 m.y. later.
Subjects/Keywords: Gordon Lake Formation; Paleoproterozoic; shallow marine; microbially induced sedimentary structures (MISS); soft-sedimentary deformation structures (SSDS); U-Pb geochronology; Sedimentology
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APA ·
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APA (6th Edition):
Hill, C. M. (2019). Sedimentology, Lithostratigraphy and Geochronology of the Paleoproterozoic Gordon Lake Formation, Huronian Supergroup, Ontario, Canada. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/6084
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hill, Carolyn M. “Sedimentology, Lithostratigraphy and Geochronology of the Paleoproterozoic Gordon Lake Formation, Huronian Supergroup, Ontario, Canada.” 2019. Thesis, University of Western Ontario. Accessed March 04, 2021.
https://ir.lib.uwo.ca/etd/6084.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hill, Carolyn M. “Sedimentology, Lithostratigraphy and Geochronology of the Paleoproterozoic Gordon Lake Formation, Huronian Supergroup, Ontario, Canada.” 2019. Web. 04 Mar 2021.
Vancouver:
Hill CM. Sedimentology, Lithostratigraphy and Geochronology of the Paleoproterozoic Gordon Lake Formation, Huronian Supergroup, Ontario, Canada. [Internet] [Thesis]. University of Western Ontario; 2019. [cited 2021 Mar 04].
Available from: https://ir.lib.uwo.ca/etd/6084.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hill CM. Sedimentology, Lithostratigraphy and Geochronology of the Paleoproterozoic Gordon Lake Formation, Huronian Supergroup, Ontario, Canada. [Thesis]. University of Western Ontario; 2019. Available from: https://ir.lib.uwo.ca/etd/6084
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Portland State University
5.
Davidson, Timothy Mathias.
Biological Erosion of Marine Habitats and Structures by Burrowing Crustaceans.
Degree: PhD, Environmental Science and Management, 2011, Portland State University
URL: https://pdxscholar.library.pdx.edu/open_access_etds/383
► Marine bioeroders, borers, and burrowers can have drastic effects to marine habitats and facilities. By physically altering the structure of marine habitats, these organisms…
(more)
▼ Marine bioeroders, borers, and burrowers can have drastic effects to
marine habitats and facilities. By physically altering the structure of
marine habitats, these organisms may elicit ecosystem-level effects that cascade through the community. While borer damage is typically restricted to a few substratum types, burrowing isopods in the genus Sphaeroma attack a diversity of substrata in tropical and temperate systems. My dissertation examined how boring sphaeromatid isopods affect coastal habitats (saltmarshes, mangroves) and other estuarine substrata as well as
marine structures. I used a combination of lab and mensurative field experiments to quantify the effects of boring by isopods and examine how select factors affect the colonization, hence burrowing damage by isopods. I explored these questions primarily using the temperate boring sphaeromatid, Sphaeroma quoianum, as a model organism. My initial lab experiments quantified the per capita erosion rates of S. quoianum in four commonly attacked estuarine substrata. I found marsh banks and Styrofoam substrata were the most affected per capita. I supplemented this lab experiment with a year-long mensurative field experiment examining how erosion rates differ between marshes infested and uninfested by boring isopods. Marshes infested with isopods eroded 300% faster than uninfested marshes. I further examined the boring effects on Styrofoam floats. I compiled surveys and observations and conducted a short experiment to describe how isopods affect Styrofoam floats used in floating docks. I observed dense colonies of isopods attacking floats and expelling millions of plastic particles in the ocean. The boring effects to simulated Styrofoam floats were also affected by seawater temperature. Burrowing effects in Styrofoam floats exhibited a curvilinear relationship with temperature and peaked around 18°C. These results suggest a 1-2°C increase in water temperature could increase boring effects 5-17% of populations of isopods in Oregon and California bays. To examine the small-scale factors that mediate colonization and boring, I conducted a series of binary choice experiments. I found the presence of conspecifics, biofilm, and shade were important factors influencing colonization. These small scale factors likely explain why isopod attack is focused in some substrata. Finally, to examine the boring effects of tropical isopods in mangroves, I examined the associations between burrowing by S. terebrans and mangrove performance and fecundity. I found negative relationships between boring effects and performance and fecundity in two mangrove species in a restored mangrove stand in Taiwan. Together, these studies elucidate the effects of bioerosive isopods on saltmarshes, mangroves, and
marine structures. However, the similar mechanisms involved in bioerosion in other boring species suggest that these results can be used to infer similar effects of other borers. In addition, since many species of sphaeromatid isopods have been introduced, this research shows how the…
Advisors/Committee Members: Catherine E. de Rivera.
Subjects/Keywords: Biological erosion; Boring isopod; Burrowing crustacean; Ecosystem engineering; Wood-borers; Marine habitats – Erosion; Offshore structures – Erosion; Marine borers; Sphaeromidae
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APA (6th Edition):
Davidson, T. M. (2011). Biological Erosion of Marine Habitats and Structures by Burrowing Crustaceans. (Doctoral Dissertation). Portland State University. Retrieved from https://pdxscholar.library.pdx.edu/open_access_etds/383
Chicago Manual of Style (16th Edition):
Davidson, Timothy Mathias. “Biological Erosion of Marine Habitats and Structures by Burrowing Crustaceans.” 2011. Doctoral Dissertation, Portland State University. Accessed March 04, 2021.
https://pdxscholar.library.pdx.edu/open_access_etds/383.
MLA Handbook (7th Edition):
Davidson, Timothy Mathias. “Biological Erosion of Marine Habitats and Structures by Burrowing Crustaceans.” 2011. Web. 04 Mar 2021.
Vancouver:
Davidson TM. Biological Erosion of Marine Habitats and Structures by Burrowing Crustaceans. [Internet] [Doctoral dissertation]. Portland State University; 2011. [cited 2021 Mar 04].
Available from: https://pdxscholar.library.pdx.edu/open_access_etds/383.
Council of Science Editors:
Davidson TM. Biological Erosion of Marine Habitats and Structures by Burrowing Crustaceans. [Doctoral Dissertation]. Portland State University; 2011. Available from: https://pdxscholar.library.pdx.edu/open_access_etds/383
Victoria University of Wellington
6.
Pawaskar, Sonali.
Impacts of man-made structures on marine biodiversity and species status - native & non-native species.
Degree: 2020, Victoria University of Wellington
URL: http://hdl.handle.net/10063/9275
► Coastal environments are exposed to anthropogenic activities such as frequent marine traffic and restructuring, i.e., addition, removal or replacing with man-made structures. Although maritime shipping…
(more)
▼ Coastal environments are exposed to anthropogenic activities such as frequent
marine traffic and restructuring, i.e., addition, removal or replacing with man-made
structures. Although maritime shipping and coastal infrastructures provide socio-economic benefits, they both cause varied perturbations to
marine ecosystems. The ports and marinas receiving a high frequency of international vessels, act as ‘hot-spots’ for
marine invasions. The disturbed and modified habitats found in harbours and ports provide opportunities for non-native species to settle due to their competitive traits. Once established, the non-native species may spread to neighbouring habitats, thereby modifying the adjacent natural environment, its biodiversity, ecosystem structure and functioning.
Up to 70% of coastlines around the world have now been modified and is expected to rise in future. New bioinvasions are still being reported even with various biosecurity and management approaches across the globe. It is essential to understand the potential factors influencing the bioinvasions to have effective biosecurity measures and management plans. The overall aim of this thesis is to determine the influence of man-made
structures on the
marine biodiversity and presumptive fitness of native and non-native species on these
structures. This thesis investigates ports and harbours as man-made environments, their impacts on
marine biodiversity and the species status – native, non-native and cryptogenic, and the factors facilitating the spread of non-native species.
Chapter 2 focussed on two large national-scale baseline port surveys; a) Australian Port Survey (APS), and b) New Zealand Port Survey (NZPS). The two datasets were analysed to determine the community structure and species status, i.e., native, non-native and cryptogenic as a function of the surveyed ports, port type (major vs minor ports) (based on the volume of vessels) and latitudinal groups. A) APS: The results for community composition indicated significant effects as a function of surveyed ports, port type and latitudinal group. The community composition was relatively more abundant at major ports than at minor ports. The factor, the latitudinal group indicated significant results, and a distinct separation in community composition was observed between low (15, 20oS) and high (35, 40oS) latitudes. The species status showed a significant and positive relationship between native vs non-native, indicating with an increase in the number of native species there was an increase in the number of non-native species. The species status indicated significant results for the factors; surveyed ports, port type and latitudinal group. The native species were abundant throughout the study. However, the non-native species were relatively abundant at major ports compared to minor ports. Regarding the latitudinal groups, the abundance of non-native species was observed to increase at higher latitudes (latitudinal gradients). B) NZPS: The community composition and species status showed significance among the…
Advisors/Committee Members: Gardner, Jonathan, Chad, Hewitt, Campbell, Marnie.
Subjects/Keywords: Non-native species; Man-made structures; Marine biodiversity; Cryptogenic species; Mytilus galloprovincialis; Biosecurity; Marine invasion; Coastal ecology; Coastal management; Settlement plates
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APA ·
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APA (6th Edition):
Pawaskar, S. (2020). Impacts of man-made structures on marine biodiversity and species status - native & non-native species. (Doctoral Dissertation). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/9275
Chicago Manual of Style (16th Edition):
Pawaskar, Sonali. “Impacts of man-made structures on marine biodiversity and species status - native & non-native species.” 2020. Doctoral Dissertation, Victoria University of Wellington. Accessed March 04, 2021.
http://hdl.handle.net/10063/9275.
MLA Handbook (7th Edition):
Pawaskar, Sonali. “Impacts of man-made structures on marine biodiversity and species status - native & non-native species.” 2020. Web. 04 Mar 2021.
Vancouver:
Pawaskar S. Impacts of man-made structures on marine biodiversity and species status - native & non-native species. [Internet] [Doctoral dissertation]. Victoria University of Wellington; 2020. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10063/9275.
Council of Science Editors:
Pawaskar S. Impacts of man-made structures on marine biodiversity and species status - native & non-native species. [Doctoral Dissertation]. Victoria University of Wellington; 2020. Available from: http://hdl.handle.net/10063/9275
Stellenbosch University
7.
Van Wageningen, Esmé.
Design of rubble-mound foundations for vertical seawalls: scour, screed layer and berm width.
Degree: MEng, Civil Engineering, 2018, Stellenbosch University
URL: http://hdl.handle.net/10019.1/104988
► ENGLISH ABSTRACT: Coastal erosion has always been a challenging problem to solve for coastal engineers since it is such a complex process that threatens valuable…
(more)
▼ ENGLISH ABSTRACT: Coastal erosion has always been a challenging problem to solve for coastal engineers since it is such a complex process that threatens valuable environments and properties along the coastline. Structural erosion, or scour, develops due to the presence of a marine structure that interrupts the natural sediment transport processes. Scour is one of the most common mechanisms of failure of marine structures and therefore it is vital to gain a better understanding of the scour process in order to design marine structures that can withstand the adverse effects of scour.
The objective of this study is to gain more knowledge of the scour process that develops in specifically the screed layer directly underneath the concrete elements of a vertical seawall that is protected by a rubble-mound berm. This was accomplished by investigating existing literature on marine structures, their failure mechanisms, the processes of sand and granular scour as well as research on physical modelling. A physical experiment was then set up in a 2D wave flume in the hydraulic laboratory of the CSIR in Stellenbosch, South Africa to test the influences of different aspects of the scour process in the screed layer underneath a model seawall. The influence of the wave period, the rubble-mound berm width, the screed layer thickness, the armour rock stability and the reflection coefficient was investigated.
The scour damage in the model screed layer was measured with wooden dowels, as was done in previous research, as well as with a new method developed by the author that uses sonar technology to create a submerged image of the scour pattern that developed in the screed layer. The scour measurements for each different test set-up were analysed. Firstly, it was found that a shorter wave period resulted in more scour damage since the interaction between the incident and reflected waves was more significant near the seawall and occasionally superimposed due to the rapid change in wave direction and orbital velocities, which disturbs the screed material. The rubble-mound berm width, however, did not have as significant an influence on screed layer scour as expected. A wider berm did provide more scour protection, but the optimal berm design must balance protection and construction and material costs and therefore a narrower berm of 4Dn50 is recommended. A minimised screed layer thickness of 100 mm is recommended since it resulted in the least amount of scour whilst still being able to be constructed at an adequate accuracy. As expected, a more stable armour layer resulted in less scour damage in the screed layer. Lastly, it was interesting to observe that a test that resulted in less scour, had a higher reflection coefficient. This is probably due to less wave energy that was absorbed by the berm (causing scour in the screed layer) but reflected back seaward instead.
AFRIKAANSE OPSOMMING: Kuserosie was nog altyd ‘n uitdagende probleem om op te los vir ingenieurs aangesien dit so ‘n ingewikkelde proses is wat die waardevolle omgewing…
Advisors/Committee Members: Schoonees, J. S., Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering..
Subjects/Keywords: Rubble mound breakwaters; Scour (Hydraulic engineering); Vertical seawall; Marine structures; UCTD; Erosion
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APA (6th Edition):
Van Wageningen, E. (2018). Design of rubble-mound foundations for vertical seawalls: scour, screed layer and berm width. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/104988
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Van Wageningen, Esmé. “Design of rubble-mound foundations for vertical seawalls: scour, screed layer and berm width.” 2018. Thesis, Stellenbosch University. Accessed March 04, 2021.
http://hdl.handle.net/10019.1/104988.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Van Wageningen, Esmé. “Design of rubble-mound foundations for vertical seawalls: scour, screed layer and berm width.” 2018. Web. 04 Mar 2021.
Vancouver:
Van Wageningen E. Design of rubble-mound foundations for vertical seawalls: scour, screed layer and berm width. [Internet] [Thesis]. Stellenbosch University; 2018. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10019.1/104988.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Van Wageningen E. Design of rubble-mound foundations for vertical seawalls: scour, screed layer and berm width. [Thesis]. Stellenbosch University; 2018. Available from: http://hdl.handle.net/10019.1/104988
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Southern Mississippi
8.
Hartman, Valerie Ann.
The Use of Computed Tomography to Measure Biogenic Structures in Recently Hypoxic and Normoxic Sediments on the Louisiana Continental Shelf.
Degree: MS, Marine Science, 2011, University of Southern Mississippi
URL: https://aquila.usm.edu/masters_theses/222
► Over the past 60 years, seasonal hypoxia in the northern Gulf of Mexico has occurred with increased severity and over a greater area. To…
(more)
▼ Over the past 60 years, seasonal hypoxia in the northern Gulf of Mexico has occurred with increased severity and over a greater area. To determine if biogenic
structures in the northern Gulf of Mexico vary in response to hypoxic stress, the seafloor on the continental shelf of Louisiana was analyzed during the spring and fall of 2009 at four provinces of similar sediment type that differ in recent history of bottom water oxygen concentration. Subcores were analyzed by computed tomography (CT) to determine the number, diameter, length, volume, surface area, and depth of biogenic burrow
structures in sediments where biogenic mixing rates, sedimentation rates, mixing depth, and invertebrate macrofauna abundance were known. Because benthic community composition and density determine what types of biogenic
structures are present and at what rate bioturbation occurs in sediments, the quantification of mixing rates and various physical parameters of biogenic
structures reveals potentially important information about the effects of hypoxia on the macrobenthic community. Results show that macrobenthic burrows were the most numerous at province NO, which had not experienced hypoxia in the past ten years. However, at the province most recently affected by hypoxia (FH), burrow abundance was the second highest out of all four provinces. The proximity of province FH to the mouth of the Mississippi River coupled with a high sedimentation rate and high deposition of organic matter at this site could increase bioturbation activities and lead to increased burrow abundances. The CT subcore taken from the province that had experienced hypoxia one year previous to the study (HO) contained significantly longer burrows with greater median volumes, surface areas, and diameters than burrows at the other three provinces. Province HO also had high abundances of macrofaunal organisms and high rates of bioturbation. This could indicate that the macrofaunal community at province HO is in an active phase of recovery from hypoxia. In conclusion, computed tomography is a non-invasive, high resolution imaging technique that provides a means to accurately quantify the effects of hypoxia on macrobenthic bioturbation
structures in
marine sediments.
Advisors/Committee Members: Charlotte A. Brunner, Kevin B. Briggs, Steven E. Lohrenz.
Subjects/Keywords: computed tomography; biogenic structures; hypoxic sediments; normoxic sediments; Louisiana Continental shelf; Marine Biology
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APA (6th Edition):
Hartman, V. A. (2011). The Use of Computed Tomography to Measure Biogenic Structures in Recently Hypoxic and Normoxic Sediments on the Louisiana Continental Shelf. (Masters Thesis). University of Southern Mississippi. Retrieved from https://aquila.usm.edu/masters_theses/222
Chicago Manual of Style (16th Edition):
Hartman, Valerie Ann. “The Use of Computed Tomography to Measure Biogenic Structures in Recently Hypoxic and Normoxic Sediments on the Louisiana Continental Shelf.” 2011. Masters Thesis, University of Southern Mississippi. Accessed March 04, 2021.
https://aquila.usm.edu/masters_theses/222.
MLA Handbook (7th Edition):
Hartman, Valerie Ann. “The Use of Computed Tomography to Measure Biogenic Structures in Recently Hypoxic and Normoxic Sediments on the Louisiana Continental Shelf.” 2011. Web. 04 Mar 2021.
Vancouver:
Hartman VA. The Use of Computed Tomography to Measure Biogenic Structures in Recently Hypoxic and Normoxic Sediments on the Louisiana Continental Shelf. [Internet] [Masters thesis]. University of Southern Mississippi; 2011. [cited 2021 Mar 04].
Available from: https://aquila.usm.edu/masters_theses/222.
Council of Science Editors:
Hartman VA. The Use of Computed Tomography to Measure Biogenic Structures in Recently Hypoxic and Normoxic Sediments on the Louisiana Continental Shelf. [Masters Thesis]. University of Southern Mississippi; 2011. Available from: https://aquila.usm.edu/masters_theses/222
Universiteit Utrecht
9.
Kuijsters, A.A.C.M.
Biological and hydro-physical facilitation processes in the recovery of offshore gravel bed communities.
Degree: 2013, Universiteit Utrecht
URL: http://dspace.library.uu.nl:8080/handle/1874/276096
► This research proposal focuses on poorly understood ecological functions of marine 3d-structures and their associated processes. The main aim of this project is to clarify…
(more)
▼ This research proposal focuses on poorly understood ecological functions of
marine 3d-
structures and their associated processes.
The main aim of this project is to clarify the importance of 3d-
structures and water flow for colonization and succession.
In addition, the general colonization capacity of species related to gravel beds will be simulated.
Advisors/Committee Members: Brinkhuis, H., Degraer, S..
Subjects/Keywords: NWO; research proposal; marine biology; ecological functions; facilitation; hydro-physiology; 3-d structures; colonization; succession; gravel bed
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APA (6th Edition):
Kuijsters, A. A. C. M. (2013). Biological and hydro-physical facilitation processes in the recovery of offshore gravel bed communities. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/276096
Chicago Manual of Style (16th Edition):
Kuijsters, A A C M. “Biological and hydro-physical facilitation processes in the recovery of offshore gravel bed communities.” 2013. Masters Thesis, Universiteit Utrecht. Accessed March 04, 2021.
http://dspace.library.uu.nl:8080/handle/1874/276096.
MLA Handbook (7th Edition):
Kuijsters, A A C M. “Biological and hydro-physical facilitation processes in the recovery of offshore gravel bed communities.” 2013. Web. 04 Mar 2021.
Vancouver:
Kuijsters AACM. Biological and hydro-physical facilitation processes in the recovery of offshore gravel bed communities. [Internet] [Masters thesis]. Universiteit Utrecht; 2013. [cited 2021 Mar 04].
Available from: http://dspace.library.uu.nl:8080/handle/1874/276096.
Council of Science Editors:
Kuijsters AACM. Biological and hydro-physical facilitation processes in the recovery of offshore gravel bed communities. [Masters Thesis]. Universiteit Utrecht; 2013. Available from: http://dspace.library.uu.nl:8080/handle/1874/276096
Universidade Estadual de Campinas
10.
Tsukada, Raphael Issamu, 1983-.
Modelagem de esforços de VIV em risers em catenária: Modeling of VIV forces in a catenary riser.
Degree: 2013, Universidade Estadual de Campinas
URL: http://repositorio.unicamp.br/jspui/handle/REPOSIP/263631
► Abstract: During the last years, the Vortex Induced Vibrations (VIV) were intensively studied from experiments with straight cylinders installed vertically or horizontally, which differ significantly…
(more)
▼ Abstract: During the last years, the Vortex Induced Vibrations (VIV) were intensively studied from experiments with straight cylinders installed vertically or horizontally, which differ significantly from curved cylinders in catenary shape, found in catenary risers. Thus, for this riser configuration, VIVs are still poorly understood. Accordingly, this thesis proposes a procedure for the calculation of VIVs in catenary riser in the time domain, using the assumptions of the principle of independence, under which only the normal component of the flow velocity relative to the riser axis is significant to VIV. A semiempirical approach is adopted to calculate the transverse forces of VIV based on hydrodynamic coefficients found from experiments with rigid cylinders oscillating transversely to the flow. The frequency of the VIV forces is calculated by changing the natural frequency of the riser due to the variation of added mass in relation to the reduced velocity. Since multi-modal responses can occur, a procedure based on experimental observations of vortex shedding cells and power-in regions are adopted to determine the vibration modes excited by VIV. Two experiments with flexible models were analyzed. From the first experiment, the validity of the considerations of the principle of independence for flexible pipes is verified. The second experiment aimed to understand the dynamic behavior of catenary risers due to VIV, which showed a great influence of traveling wave's behavior in the response of the structure to VIV. Finally, the procedure of calculating VIV was compared with experimental results for different configurations and showed good agreement.
Advisors/Committee Members: UNIVERSIDADE ESTADUAL DE CAMPINAS (CRUESP), Morooka, Celso Kazuyuki, 1958- (advisor), Universidade Estadual de Campinas. Faculdade de Engenharia Mecânica (institution), Universidade Estadual de Campinas. Instituto de Geociências (institution), Programa de Pós-Graduação em Ciências e Engenharia de Petróleo (nameofprogram), Bordalo, Sérgio Nascimento (committee member), Pavanello, Renato (committee member), Sphaier, Sergio Hamilton (committee member), Franciss, Ricardo (committee member).
Subjects/Keywords: Estruturas marítimas - Hidrodinâmica; Engenharia de petróleo; Vibração (Engenharia naval); Vórtices; Maritime structures - Hydrodynamics; Petroleum engineering; Vibration (Marine engineering); Vortices
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APA (6th Edition):
Tsukada, Raphael Issamu, 1. (2013). Modelagem de esforços de VIV em risers em catenária: Modeling of VIV forces in a catenary riser. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/263631
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Tsukada, Raphael Issamu, 1983-. “Modelagem de esforços de VIV em risers em catenária: Modeling of VIV forces in a catenary riser.” 2013. Thesis, Universidade Estadual de Campinas. Accessed March 04, 2021.
http://repositorio.unicamp.br/jspui/handle/REPOSIP/263631.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tsukada, Raphael Issamu, 1983-. “Modelagem de esforços de VIV em risers em catenária: Modeling of VIV forces in a catenary riser.” 2013. Web. 04 Mar 2021.
Vancouver:
Tsukada, Raphael Issamu 1. Modelagem de esforços de VIV em risers em catenária: Modeling of VIV forces in a catenary riser. [Internet] [Thesis]. Universidade Estadual de Campinas; 2013. [cited 2021 Mar 04].
Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/263631.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tsukada, Raphael Issamu 1. Modelagem de esforços de VIV em risers em catenária: Modeling of VIV forces in a catenary riser. [Thesis]. Universidade Estadual de Campinas; 2013. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/263631
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Southern Mississippi
11.
Brock, Melissa.
The Effect of Historic Shipwrecks on Sediment Microbiomes in the Northern Gulf of Mexico.
Degree: MS, 2019, University of Southern Mississippi
URL: https://aquila.usm.edu/masters_theses/707
► Microorganisms are ubiquitously distributed across all aquatic habitats, but it is the environmental conditions of a habitat that determine which microorganisms can thrive in…
(more)
▼ Microorganisms are ubiquitously distributed across all aquatic habitats, but it is the environmental conditions of a habitat that determine which microorganisms can thrive in terms of abundance or metabolic activity. Habitats that experience consistent physical and chemical environmental conditions repeatedly favor specific taxonomic groups which may result in a microbial assemblage that is commonly associated with that habitat (i.e., a core microbiome). Core microbiomes have been identified for a variety of natural
marine habitats including methane seeps, wood falls, octocoral, and deep-sea sediments. However, it was unknown if the presence of man-made
structures on the seafloor, including historic shipwrecks, also resulted in a distinct core microbiome. To determine how historic shipwrecks impact sediment microbiomes under varying environmental conditions, the influence of these
structures was examined through bacterial and archaeal 16S rRNA gene amplicon analysis. A distinct sediment core microbiome of wooden-hulled shipwrecks was identified for both bacteria and archaea. Variation of the core microbiome was explained by sediment depth, porosity, total inorganic carbon, and total nitrogen. Results from this study demonstrate that historic shipwrecks on the seafloor modify natural environmental conditions and shape sediment microbial communities.
Advisors/Committee Members: Leila Hamdan, Wei Wu, Kevin Dillon.
Subjects/Keywords: microbial ecology; anthropogenic structures; deep-sea sediments; 16S rRNA sequencing; Biodiversity; Bioinformatics; Environmental Microbiology and Microbial Ecology; Marine Biology
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APA (6th Edition):
Brock, M. (2019). The Effect of Historic Shipwrecks on Sediment Microbiomes in the Northern Gulf of Mexico. (Masters Thesis). University of Southern Mississippi. Retrieved from https://aquila.usm.edu/masters_theses/707
Chicago Manual of Style (16th Edition):
Brock, Melissa. “The Effect of Historic Shipwrecks on Sediment Microbiomes in the Northern Gulf of Mexico.” 2019. Masters Thesis, University of Southern Mississippi. Accessed March 04, 2021.
https://aquila.usm.edu/masters_theses/707.
MLA Handbook (7th Edition):
Brock, Melissa. “The Effect of Historic Shipwrecks on Sediment Microbiomes in the Northern Gulf of Mexico.” 2019. Web. 04 Mar 2021.
Vancouver:
Brock M. The Effect of Historic Shipwrecks on Sediment Microbiomes in the Northern Gulf of Mexico. [Internet] [Masters thesis]. University of Southern Mississippi; 2019. [cited 2021 Mar 04].
Available from: https://aquila.usm.edu/masters_theses/707.
Council of Science Editors:
Brock M. The Effect of Historic Shipwrecks on Sediment Microbiomes in the Northern Gulf of Mexico. [Masters Thesis]. University of Southern Mississippi; 2019. Available from: https://aquila.usm.edu/masters_theses/707
University of St. Andrews
12.
Damianidis, Kostas.
Vernacular boats and boatbuilding in Greece
.
Degree: 1991, University of St. Andrews
URL: http://hdl.handle.net/10023/7116
► This work presents a study of the vernacular boats of modern Greece. A new typology of boats is offered, and an account is given of…
(more)
▼ This work presents a study of the vernacular boats of
modern Greece. A new typology of boats is offered, and
an account is given of tools and boatyard practice,
design and construction techniques. Evidence for these
subjects is drawn from field surveys, museum collections,
iconographic studies, and interviews with old
boatbuilders. Although most of the information presented
comes from the first half of the 20th century, background
information from the 18th and 19th centuries is also
covered. This longer historical perspective is
particularly important in making comparisons between 20th
century practices and the boatbuilding techniques of the
past.
There is evidence for the existence of two main periods
of technical change in the industry, namely, the late
18th century, when new methods such as lofting were
introduced, and the late 19th century, when changes in
the wider shipbuilding industry initiated a process of
decline in vernacular boatbuilding. At the same time
however, a number of older techniques, for example
certain moulding methods, survived at least into the
first part of the 20th century.
This work offers new insights into the design methods
involved in the control of hull-form during "skeletonfirst"
boatbuilding from the last two hundred years. It
also offers an analysis of the structural integrity and
strength of vernacular boats and shows how the structure
of boats has evolved across time to incorporate new
techniques and changes in boat function.
Advisors/Committee Members: Prescott, R. G. W (advisor).
Subjects/Keywords: Marine engineering;
Ships;
Offshore structures;
Offshore engineering
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APA (6th Edition):
Damianidis, K. (1991). Vernacular boats and boatbuilding in Greece
. (Thesis). University of St. Andrews. Retrieved from http://hdl.handle.net/10023/7116
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Damianidis, Kostas. “Vernacular boats and boatbuilding in Greece
.” 1991. Thesis, University of St. Andrews. Accessed March 04, 2021.
http://hdl.handle.net/10023/7116.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Damianidis, Kostas. “Vernacular boats and boatbuilding in Greece
.” 1991. Web. 04 Mar 2021.
Vancouver:
Damianidis K. Vernacular boats and boatbuilding in Greece
. [Internet] [Thesis]. University of St. Andrews; 1991. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10023/7116.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Damianidis K. Vernacular boats and boatbuilding in Greece
. [Thesis]. University of St. Andrews; 1991. Available from: http://hdl.handle.net/10023/7116
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Portland State University
14.
Powell, James Wright Burrus.
Bone Mineral Density of the Common Bottlenose Dolphin, <i>Tursiops truncatus</i>: a Proposed Model for Monitoring Osteological and Ecosystem Health.
Degree: PhD, Biology, 2019, Portland State University
URL: https://pdxscholar.library.pdx.edu/open_access_etds/5344
► Bone mineral density (BMD) in the pectoral flipper of the common bottlenose dolphin, Tursiops truncatus, was examined to address the need to define a…
(more)
▼ Bone mineral density (BMD) in the pectoral flipper of the common bottlenose dolphin,
Tursiops truncatus, was examined to address the need to define a comprehensive target site for clinical osteodensitometric assessment and to establish ranges of observed bone density values for this species. Radii were analyzed using dual energy X-ray absorptiometry (DXA), the accepted standard in human medical studies. Multiple loci within the radius were identified and assessed for their correlation to BMD of the entire bone. Radii BMD were also examined for differences based on sex, age, total body length, handedness, geographical affinity, and nutritional status at time of death. No statistically significant differences were observed in BMD measurements for male and female dolphins or right and left flippers. Additionally, no statistically significant differences were observed based on geographical region or nutritional status at time of death. These results support the inclusion of all specimens used in this study as a descriptive reference dataset for bone density values in bottlenose dolphins and detail a primary skeletal site for clinical assessment of bone density for the species. The values utilized in this study represent the largest dataset published on BMD in any wildlife or
marine mammal species to date.
In the skeletal specimens analyzed, BMD increased with age and body length; however, the variance of bone density values that was observed at any given age was of such magnitude that it precludes the use of this single parameter as a reliable estimator of age. The clinical measurement of an individual's bone density at any given time is a direct reflection of that individual's skeletal health. Reducing osteodensitometry to a static age estimation tool would inherently disregard the biological and physiological function of calcified tissues. Variation of bone density values at any given age may be an indicator of altered skeletal health due to numerous factors including overall health, nutritive status, contaminant exposure, body condition, or metabolic and endocrine related disorders.
Despite its accuracy, precision, and widespread use, DXA has limitations and clinical shortcomings. The technology is not appropriate for all healthcare and screening applications due to the inherent use of radiation, large size of units, relatively high associated costs, and limited access and availability. Quantitative ultrasound (QUS) methods for bone assessment have demonstrated potential to determine bone quality and to provide information about BMD. QUS is beneficial in that it is portable, nondestructive, noninvasive, less expensive than X-ray technology, and does not expose patients or technicians to radiation. To circumvent limitations in traditional radiographic bone density assessment, a custom QUS device and protocols were developed for assessment of live bottlenose dolphins. In laboratory measurements on disarticulated pectoral flippers collected post-mortem, a strong correlation was established…
Advisors/Committee Members: Deborah Duffield.
Subjects/Keywords: Bottlenose dolphin – Health; Bones; Bone densitometry; Marine mammals – Effect of environment on; Animal Sciences; Animal Structures; Biology
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Manager
APA (6th Edition):
Powell, J. W. B. (2019). Bone Mineral Density of the Common Bottlenose Dolphin, <i>Tursiops truncatus</i>: a Proposed Model for Monitoring Osteological and Ecosystem Health. (Doctoral Dissertation). Portland State University. Retrieved from https://pdxscholar.library.pdx.edu/open_access_etds/5344
Chicago Manual of Style (16th Edition):
Powell, James Wright Burrus. “Bone Mineral Density of the Common Bottlenose Dolphin, <i>Tursiops truncatus</i>: a Proposed Model for Monitoring Osteological and Ecosystem Health.” 2019. Doctoral Dissertation, Portland State University. Accessed March 04, 2021.
https://pdxscholar.library.pdx.edu/open_access_etds/5344.
MLA Handbook (7th Edition):
Powell, James Wright Burrus. “Bone Mineral Density of the Common Bottlenose Dolphin, <i>Tursiops truncatus</i>: a Proposed Model for Monitoring Osteological and Ecosystem Health.” 2019. Web. 04 Mar 2021.
Vancouver:
Powell JWB. Bone Mineral Density of the Common Bottlenose Dolphin, <i>Tursiops truncatus</i>: a Proposed Model for Monitoring Osteological and Ecosystem Health. [Internet] [Doctoral dissertation]. Portland State University; 2019. [cited 2021 Mar 04].
Available from: https://pdxscholar.library.pdx.edu/open_access_etds/5344.
Council of Science Editors:
Powell JWB. Bone Mineral Density of the Common Bottlenose Dolphin, <i>Tursiops truncatus</i>: a Proposed Model for Monitoring Osteological and Ecosystem Health. [Doctoral Dissertation]. Portland State University; 2019. Available from: https://pdxscholar.library.pdx.edu/open_access_etds/5344
15.
Gianni, Fabrizio.
Conservation et restauration écologique des forêts marines Méditerranéennes : Conservation and ecological restoration of Mediterranean marine forests.
Degree: Docteur es, Sciences de l'environnement, 2016, Nice
URL: http://www.theses.fr/2016NICE4028
► Une perte des forêts marines de grandes algues brunes a été observée dans les récentes décennies, causant un changement des écosystèmes et une réduction de…
(more)
▼ Une perte des forêts marines de grandes algues brunes a été observée dans les récentes décennies, causant un changement des écosystèmes et une réduction de la biodiversité. Dans le cadre du projet MMMPA, ce travail de thèse vise à répondre à certaines importantes questions liées à la conservation et à la restauration des forêts d'algues, au rôle des Aires Marines Protégées (AMPs) et les poissons herbivores. Les résultats des expériences sur le terrain ont montré que les poissons herbivores indigènes, probablement Salpa Sarpa (saupes), peuvent être les herbivores les plus efficace des ceintures intertidales de Cystoseira. En effet, les saupes affectent fortement la croissance, la biomasse et la reproduction des forêts naturelles et limitent le succès de la restauration sur des substrats artificiels. Le rôle des poissons herbivores a probablement été négligé dans la régulation des communautés macroalgales Méditerranéennes. Une revue de la littérature existante a montré une amélioration de l'intérêt scientifique (articles publiés) sur les espèces formant les forêts marines, au cours des dernières décennies. Cependant, la plupart de la recherche scientifique n’est pas en relation avec les AMPs, probablement parce que les forêts marines ne sont pas toujours considérées pendant la création des AMPs et dans les plans de gestion. Les études sur les forêts marines étant concentrée dans les pays développés, elles ne sont pas réparties de manière homogène dans le monde.
Loss of marine forests of large brown seaweeds has been observed in recent decades, causing a reduction of ecosystem biodiversity. In the framework of the MMMPA project, this PhD aimed to address some important topics related to the conservation and restoration of algal forests, the role of Marine Protected Areas (MPAs) and fish herbivory. Different approaches were used: macroalgae surveys, literature reviews, manipulative experiments, tank-based experiments and GIS habitat mapping. Results from field experiments showed that native herbivorous fish, likely Sarpa salpa (salemas), can be the most effective herbivore of intertidal Cystoseira belts both on natural and artificial substrates. Indeed, salemas strongly affected the growth, biomass and reproductive output of natural forests and limited restoration success on artificial substrates. Likely, the role of the herbivorous fish in structuring macroalgal communities has been overlooked in the Mediterranean Sea so far. A review of the existing literature showed that knowledge on marine forests forming species has improved in recent decades. However, most of the research is not in relation to MPAs, likely due to the fact that marine forests are not always included in MPAs planning and management plans. Studies on marine forests are not homogeneously distributed in the world, being concentrated in the developed countries. Interestingly, an increase of the scientific interest (published papers) was observed. Nowadays, marine forests are under continuous threats and especially sensitive to multiple impacts.
Advisors/Committee Members: Passeron-Mangialajo, Luisa (thesis director), Airoldi, Laura (thesis director).
Subjects/Keywords: Forêts marines; Aires marines protégées; Poissons herbivores; Conservation; Restauration; Algues; Macroalgues; Mer Méditerranée; Structures artificielles; Herbivorie; Suivi; Gestion; Mer tempérée; Marine forests; Marine protected areas; Herbivorous fishes; Conservation; Restoration; Seaweeds; Macroalgae; Mediterranean Sea; Artificial structures; Herbivory; Monitoring; Management; Temperate sea
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APA (6th Edition):
Gianni, F. (2016). Conservation et restauration écologique des forêts marines Méditerranéennes : Conservation and ecological restoration of Mediterranean marine forests. (Doctoral Dissertation). Nice. Retrieved from http://www.theses.fr/2016NICE4028
Chicago Manual of Style (16th Edition):
Gianni, Fabrizio. “Conservation et restauration écologique des forêts marines Méditerranéennes : Conservation and ecological restoration of Mediterranean marine forests.” 2016. Doctoral Dissertation, Nice. Accessed March 04, 2021.
http://www.theses.fr/2016NICE4028.
MLA Handbook (7th Edition):
Gianni, Fabrizio. “Conservation et restauration écologique des forêts marines Méditerranéennes : Conservation and ecological restoration of Mediterranean marine forests.” 2016. Web. 04 Mar 2021.
Vancouver:
Gianni F. Conservation et restauration écologique des forêts marines Méditerranéennes : Conservation and ecological restoration of Mediterranean marine forests. [Internet] [Doctoral dissertation]. Nice; 2016. [cited 2021 Mar 04].
Available from: http://www.theses.fr/2016NICE4028.
Council of Science Editors:
Gianni F. Conservation et restauration écologique des forêts marines Méditerranéennes : Conservation and ecological restoration of Mediterranean marine forests. [Doctoral Dissertation]. Nice; 2016. Available from: http://www.theses.fr/2016NICE4028
16.
Brilouet, Pierre-Etienne.
Thermodynamique et turbulence dans les épisodes de vent fort sur le Golfe du Lion : Thermodynamics and tubulence during cold air outbreaks over the Gulf of Lion.
Degree: Docteur es, Océan, atmosphère, climat, 2017, Université Toulouse III – Paul Sabatier
URL: http://www.theses.fr/2017TOU30192
► En période hivernale, le golfe du Lion est sujet à des conditions de vents régionaux forts (Mistral et/ou Tramontane) qui transportent des masses d'air continentales…
(more)
▼ En période hivernale, le golfe du Lion est sujet à des conditions de vents régionaux forts (Mistral et/ou Tramontane) qui transportent des masses d'air continentales froides et sèches au dessus de la mer. Ces événements, les Cold Air Outbreaks (CAO) , conduisent à d'intenses échanges air-mer et donc à un pompage de chaleur qui favorise la formation d'eaux denses et le déclenchement de la convection océanique profonde. La bonne représentation de ces échanges air-mer intenses dans les modèles de climat et de prévision numérique du temps reste à l'heure actuelle une problématique majeure. Elle est au cœur du projet ASICS-MED centré sur compréhension des mécanismes de formation d'eaux denses en Méditerranée et qui s'inscrit dans le cadre de la thématique " Échanges air-mer intenses " du programme HyMeX dédié à l'étude du cycle de l'eau en Méditerranée. Les processus qui s'opèrent au sein de la couche limite atmosphérique
marine (CLAM) et de la couche de mélange océanique (CMO) interagissent entre eux à différentes échelles spatiales et temporelles. La compréhension de l'évolution globale de la CLAM mais également des mécanismes locaux nécessitent la prise en compte de l'ensemble des processus. L'étude présentée ici est consacrée à la structure moyenne et turbulente de la CLAM en conditions de vents forts. L'objectif est de déterminer comment l'organisation du champ turbulent est impactée lors d'épisodes de CAO et d'estimer les flux de surface associés à ces conditions de vents forts. La méthodologie adoptée est basée sur l'utilisation conjointe d'observations aéroportées collectées lors de la campagne de mesure SOP2 d'HyMeX et de simulations numériques. La campagne de mesure SOP2 d'HyMeX qui a eu lieu au cours de l'hiver 2013 dans le golfe du Lion a permis de documenter grâce à l'avion de recherche ATR42 la structure moyenne et turbulente de la CLAM lors de 11 épisodes de CAO. Une analyse spectrale s'appuyant sur un modèle analytique a été réalisé sur 181 paliers (i.e. segments de vol rectilignes et stabilisés en altitude). Les profils verticaux des échelles turbulentes caractéristiques ainsi que la forme du spectre de la vitesse verticale ont permis de mettre en évidence un allongement des
structures énergétiques dans l'axe du vent moyen associé à l'organisation du champ turbulent sous la forme de rouleaux longitudinaux. Une description unidirectionnelle du champ turbulent tridimensionnel peut conduire à une représentativité limitée des
structures cohérentes au sein des échantillons. Cependant, la connaissance des profils de flux sur toute l'épaisseur de la CLAM est nécessaire pour l'estimation des échanges air-mer. Une méthode de correction des flux turbulents calculés par eddy correlation a été appliqué afin de prendre en compte les erreurs systématique et aléatoire relatives à la mesure et au traitement de données. Cette correction a permis de déterminer les meilleures estimations possibles des flux extrapolés à la surface avec une marge d'incertitude pour les 11 épisodes de CAO documentés lors de la campagne SOP2…
Advisors/Committee Members: Durand, Pierre (thesis director), Canut, Guylaine (thesis director).
Subjects/Keywords: Couche limite atmosphérique marine; Echanges air-mer; Conditions de vents forts; HyMeX-SOP2; Structures cohérentes; Observations aéroportées; Simulation haute résolution; Marine atmospheric boundary layer; Air-sea exchanges; CAO events; HyMeX-SOP2; Coherent structures; Airborne measurements; Large-eddy simulation
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APA ·
Chicago ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Brilouet, P. (2017). Thermodynamique et turbulence dans les épisodes de vent fort sur le Golfe du Lion : Thermodynamics and tubulence during cold air outbreaks over the Gulf of Lion. (Doctoral Dissertation). Université Toulouse III – Paul Sabatier. Retrieved from http://www.theses.fr/2017TOU30192
Chicago Manual of Style (16th Edition):
Brilouet, Pierre-Etienne. “Thermodynamique et turbulence dans les épisodes de vent fort sur le Golfe du Lion : Thermodynamics and tubulence during cold air outbreaks over the Gulf of Lion.” 2017. Doctoral Dissertation, Université Toulouse III – Paul Sabatier. Accessed March 04, 2021.
http://www.theses.fr/2017TOU30192.
MLA Handbook (7th Edition):
Brilouet, Pierre-Etienne. “Thermodynamique et turbulence dans les épisodes de vent fort sur le Golfe du Lion : Thermodynamics and tubulence during cold air outbreaks over the Gulf of Lion.” 2017. Web. 04 Mar 2021.
Vancouver:
Brilouet P. Thermodynamique et turbulence dans les épisodes de vent fort sur le Golfe du Lion : Thermodynamics and tubulence during cold air outbreaks over the Gulf of Lion. [Internet] [Doctoral dissertation]. Université Toulouse III – Paul Sabatier; 2017. [cited 2021 Mar 04].
Available from: http://www.theses.fr/2017TOU30192.
Council of Science Editors:
Brilouet P. Thermodynamique et turbulence dans les épisodes de vent fort sur le Golfe du Lion : Thermodynamics and tubulence during cold air outbreaks over the Gulf of Lion. [Doctoral Dissertation]. Université Toulouse III – Paul Sabatier; 2017. Available from: http://www.theses.fr/2017TOU30192
17.
Biari, Youssef.
Structure profonde de la marge Nord-Ouest Africaine : Deep crustal structure of the North-West African margin.
Degree: Docteur es, Géosciences marines, 2015, Brest; Université Chouaïb Doukkali (El Jadida, Maroc)
URL: http://www.theses.fr/2015BRES0080
► La marge NE Américaine est une des marges les mieux étudiées au monde, elle a fait l’objet de plusieurs études géophysiques. En comparaison, la marge…
(more)
▼ La marge NE Américaine est une des marges les mieux étudiées au monde, elle a fait l’objet de plusieurs études géophysiques. En comparaison, la marge africaine reste peu étudiée car uniquement deux campagnes océanographiques y ont été menées : la campagne Sismar (2001) au large de la Meseta et la campagne Dakhla (2002) au large du Sahara. La structure profonde de la marge canadienne est connue grâce aux profils de sismique grand-angle SMART-1, 2 et 3. Le premier objectif du projet MIRROR était d’acquérir des profils combinant sismique grand-angle et sismique réflexion sur un segment homologue au profil SMART-1. La comparaison entre les segments homologues de ces deux marges ayant pour but de mieux comprendre le mode d’ouverture de l'océan Atlantique Central. Une comparaison entre les modèles Sismar, Dakhla et Mirror montre que la croûte continentale est plus épaisse au nord et s'amincit vers le sud. La largeur de la zone de transition est plus étroite au sud et les profils Sismar sont localisés sur un bassin sédimentaire posé sur une croûte continentale très amincie. La comparaison avec la marge homologue montre que l'épaisseur, la structure de la croûte continentale et la zone d'amincissement sont très semblables. Par contre, il existe une zone de manteau exhumé et serpentinisé sur le profil Canadien qui n'a pas d’homologue sur la marge africaine. De plus, l'épaisseur de la croûte océanique est différente avec 8 km sur la côte africaine et seulement 3-4 km sur la marge canadienne. Plusieurs hypothèses ont été proposées pour expliquer cette différence (a) une différence d’âge entre les deux croûtes (b) un épaississement lié au passage du point chaud des Canaries (c) une accrétion asymétrique.
The NE American margin represents one of the best studied margins in the world, it was the subject of several scientific programs. In comparison, the conjugate NW African margin remains fairly unknown, only two deep seismic cruises were acquired: the SISMAR cruise (2001) offshore the Meseta and the DAKHLA cruise (2002) offshore the Sahara. The deep structure of the Canadian margin is known due to the SMART wide-angle seismic profiles 1, 2 and 3. The first objective of the MIRROR project was to acquire combined wide-angle and deep reflection seismic data offshore a segment conjugate to the SMART-1 profile. The comparison between the homologous segments of these two margins aimed to better understand the opening mechanism of the Central Atlantic Ocean. A comparison between Sismar, Dakhla and Mirror models shows that the continental crust is thicker in the north and thins toward the south. The width of the transition zone is narrower south and Sismar profiles are located on a sedimentary basin placed on a very thinned continental crust. Comparing the Mirror profile with that of the Canadian conjugate margin (Smart 1) shows that the thickness, the structure of the continental crust and the thinning is very similar. However, zones of exhumed and serpentinized mantle were imaged along the Canadian profile that have no conjugate on…
Advisors/Committee Members: Klingelhoefer, Frauke (thesis director), Aslanian, Daniel (thesis director), Sahabi, Mohamed (thesis director).
Subjects/Keywords: Marge NO-Africaine; Structures profondes; Sismique-réflexion marine; Sismique grand-angle; NW African margin; NE American margin; Deep crustal structure; Wide-angle seismic; Reflection seismic; Passive margins; Plate reconstruction
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APA ·
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CSE |
Export
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APA (6th Edition):
Biari, Y. (2015). Structure profonde de la marge Nord-Ouest Africaine : Deep crustal structure of the North-West African margin. (Doctoral Dissertation). Brest; Université Chouaïb Doukkali (El Jadida, Maroc). Retrieved from http://www.theses.fr/2015BRES0080
Chicago Manual of Style (16th Edition):
Biari, Youssef. “Structure profonde de la marge Nord-Ouest Africaine : Deep crustal structure of the North-West African margin.” 2015. Doctoral Dissertation, Brest; Université Chouaïb Doukkali (El Jadida, Maroc). Accessed March 04, 2021.
http://www.theses.fr/2015BRES0080.
MLA Handbook (7th Edition):
Biari, Youssef. “Structure profonde de la marge Nord-Ouest Africaine : Deep crustal structure of the North-West African margin.” 2015. Web. 04 Mar 2021.
Vancouver:
Biari Y. Structure profonde de la marge Nord-Ouest Africaine : Deep crustal structure of the North-West African margin. [Internet] [Doctoral dissertation]. Brest; Université Chouaïb Doukkali (El Jadida, Maroc); 2015. [cited 2021 Mar 04].
Available from: http://www.theses.fr/2015BRES0080.
Council of Science Editors:
Biari Y. Structure profonde de la marge Nord-Ouest Africaine : Deep crustal structure of the North-West African margin. [Doctoral Dissertation]. Brest; Université Chouaïb Doukkali (El Jadida, Maroc); 2015. Available from: http://www.theses.fr/2015BRES0080
18.
Green, Alexander Malcolm.
Geometric Optimisation of Earth Retaining Quay Walls for the Marine Environment through the use of Ground Anchors.
Degree: MEng, Civil Engineering, 2018, Stellenbosch University
URL: http://hdl.handle.net/10019.1/105049
► ENGLISH ABSTRACT: Quay walls which accommodate the docking of marine vessels form an important part of port structures. This thesis focuses on the optimisation of…
(more)
▼ ENGLISH ABSTRACT: Quay walls which accommodate the docking of marine vessels form an important part
of port structures. This thesis focuses on the optimisation of precast concrete cantilever
type quay walls with the incorporation of a tensioned ground anchor. With the use of
this anchor concept the mass of these precast cantilever type quay walls can be optimised.
A case study of the Port of Saldanha, South Africa was used to provide design parameters
such as structural loading, geotechnical information and a comparative as built design
for input into the quay wall optimisation process.
The optimisation process consists of global structural system stability checks using working
state design principles followed by the structural design of the precast concrete element
at the ultimate limit state. A layout with a mass of 183 tons compared with the
as built structure having a mass of 330 tons was determined for the equivalent 5.9m
length of quay wall precast component. The required anchor force for this layout was
2752kN. This anchor force can be accommodated with a twin ground anchor system using
ASDO500 M80/60 ground anchor bars manufactured by Anker Schroeder.
The mass reduction obtained will allow for the use of smaller and more readily available
marine hoisting plant during the construction phase, and can markedly decrease cost of
the overall port development project.
AFRIKAANSE OPSOMMING: Kaaimure wat die koepeering van seevarende voertuie akkommodeer, is 'n belangrike
deel van hawe strukture. Hierdie tesis fokus op die optimalisering van voorafgegooide
betonhoek tipe kaaimure met die gebruik van 'n grond spanningsanker.Met die gebruik
van hierdie ankerkonsep, sal die massa van die betonhoek tipe kaaimure ge-optimaliseer
kan word.
'n Gevallestudie van Saldanha Hawe in Suid Afrika was gebruik om die ontwerp grense,
soos strukturele lading, geotegniese inligting en 'n bestaande bou ontwerp vir insette in
die kaaimuur optimaliseringsproses, te verskaf.
Die optimaliseringsproses bestaan uit wereldwye struturele sisteem stabiliteits reà ls wat
van werkende ontwerpsbeginsels gebruik maak, gevolg deur die strukturele ontwerp van
voorafgegooide beton elemente, in 'n beperkte vorm. 'n Uitleg met 'n massa van 183 ton
word vergelyk met die bestaande struktuur met 'n massa van 330 ton, om die vergelykbare
lengte van 5.9m vir die voorafgegooide kaaimuur te bepaal. Die nodige ankerkrag
vir hierdie uitleg, was 2752kN. Hierdie ankerkrag kan bereik word met 'n dubbel anker
grond sisteem wat ASDO500 M80/60 grond ankerbalke gebruik. Die balke word deur
Anker Schroeder vervaardig.
Die vermindering in benodigde massa sal toelaat vir die gebruik van kleiner, maklike
bekombare mariene hyserinstallasies in die konstruksie fase, wat na 'n aansienlike vermindering
in die algehele hawe ontwikkelingsprojek kostes kan lei.
Advisors/Committee Members: Strasheim, J A vB, Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering..
Subjects/Keywords: Quays; Optimisation; Ground Anchors; Marine Engineering; UCTD; Hydraulic structures
…Loading
The various loads that can be applied to marine structures can be dened in four basic… …such as those created by a tsunami or a seismic event.
The loads on marine structures are… …or near the marine structure.
These permanent structures include warehouses, administration… …Marine Sands (Variably Calcretised) . . . . . . . . . . . . . . . . . . . . .
C.2… …Port Structures
121
K Maritime Transportation Vessel Details
K.0.1 Transport Capacity…
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APA ·
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MLA ·
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CSE |
Export
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APA (6th Edition):
Green, A. M. (2018). Geometric Optimisation of Earth Retaining Quay Walls for the Marine Environment through the use of Ground Anchors. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/105049
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Green, Alexander Malcolm. “Geometric Optimisation of Earth Retaining Quay Walls for the Marine Environment through the use of Ground Anchors.” 2018. Thesis, Stellenbosch University. Accessed March 04, 2021.
http://hdl.handle.net/10019.1/105049.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Green, Alexander Malcolm. “Geometric Optimisation of Earth Retaining Quay Walls for the Marine Environment through the use of Ground Anchors.” 2018. Web. 04 Mar 2021.
Vancouver:
Green AM. Geometric Optimisation of Earth Retaining Quay Walls for the Marine Environment through the use of Ground Anchors. [Internet] [Thesis]. Stellenbosch University; 2018. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10019.1/105049.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Green AM. Geometric Optimisation of Earth Retaining Quay Walls for the Marine Environment through the use of Ground Anchors. [Thesis]. Stellenbosch University; 2018. Available from: http://hdl.handle.net/10019.1/105049
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
19.
van Lieshout, P.S.
On the assessment of multiaxial fatigue resistance of welded steel joints in marine structures when exposed to non-proportional constant amplitude loading.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a
;
urn:NBN:nl:ui:24-uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a
;
afd39f40-7569-4cc6-ac1a-659342b45f9a
;
10.4233/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a
;
urn:NBN:nl:ui:24-uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a
;
http://resolver.tudelft.nl/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a
► Structural geometry and stochastic loads such as swell and wind seas can typically induce multiaxial stress states in welded details of marine structures. It is…
(more)
▼ Structural geometry and stochastic loads such as swell and wind seas can typically induce multiaxial stress states in welded details of
marine structures. It is known that such complex time varying stress states determine the fatigue resistance of welded steel joints. Therefore, it is of importance to account for them in fatigue lifetime assessment. Over the past few decades, a wide variety of design codes and guidelines have been developed for performing fatigue assessments in engineering practice. In particular for multiaxial fatigue lifetime assessment, additional methods have been developed. These multiaxial fatigue methods are typically developed within academia. A consensus on the most suitable approach for the assessment of multiaxial fatigue in
marine structures is lacking. This requires thorough investigation of all different approaches, and equitable comparison and validation with experimental data. Establishing a test setup that enables to test multiaxial fatigue of welded
marine structures, is however time and cost intensive. Therefore, experimental multiaxial fatigue data is scarce.
Advisors/Committee Members: Kaminski, M.L., den Besten, J.H., Delft University of Technology.
Subjects/Keywords: marine structures; multiaxial fatigue; steel; welded joints; non-proportional; constant amplitude loading
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APA ·
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Export
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APA (6th Edition):
van Lieshout, P. S. (2020). On the assessment of multiaxial fatigue resistance of welded steel joints in marine structures when exposed to non-proportional constant amplitude loading. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; urn:NBN:nl:ui:24-uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; afd39f40-7569-4cc6-ac1a-659342b45f9a ; 10.4233/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; urn:NBN:nl:ui:24-uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; http://resolver.tudelft.nl/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a
Chicago Manual of Style (16th Edition):
van Lieshout, P S. “On the assessment of multiaxial fatigue resistance of welded steel joints in marine structures when exposed to non-proportional constant amplitude loading.” 2020. Doctoral Dissertation, Delft University of Technology. Accessed March 04, 2021.
http://resolver.tudelft.nl/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; urn:NBN:nl:ui:24-uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; afd39f40-7569-4cc6-ac1a-659342b45f9a ; 10.4233/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; urn:NBN:nl:ui:24-uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; http://resolver.tudelft.nl/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a.
MLA Handbook (7th Edition):
van Lieshout, P S. “On the assessment of multiaxial fatigue resistance of welded steel joints in marine structures when exposed to non-proportional constant amplitude loading.” 2020. Web. 04 Mar 2021.
Vancouver:
van Lieshout PS. On the assessment of multiaxial fatigue resistance of welded steel joints in marine structures when exposed to non-proportional constant amplitude loading. [Internet] [Doctoral dissertation]. Delft University of Technology; 2020. [cited 2021 Mar 04].
Available from: http://resolver.tudelft.nl/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; urn:NBN:nl:ui:24-uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; afd39f40-7569-4cc6-ac1a-659342b45f9a ; 10.4233/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; urn:NBN:nl:ui:24-uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; http://resolver.tudelft.nl/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a.
Council of Science Editors:
van Lieshout PS. On the assessment of multiaxial fatigue resistance of welded steel joints in marine structures when exposed to non-proportional constant amplitude loading. [Doctoral Dissertation]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; urn:NBN:nl:ui:24-uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; afd39f40-7569-4cc6-ac1a-659342b45f9a ; 10.4233/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; urn:NBN:nl:ui:24-uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a ; http://resolver.tudelft.nl/uuid:afd39f40-7569-4cc6-ac1a-659342b45f9a
University of Maine
20.
Michael, Antonis Petrou.
Repair of Wood Piles with Fiber Reinforced Composites.
Degree: MSCE, Civil Engineering, 2002, University of Maine
URL: https://digitalcommons.library.umaine.edu/etd/156
► Piles made of treated wood have been traditionally used for the construction of piers and other waterfront structures. The main concern related to wood…
(more)
▼ Piles made of treated wood have been traditionally used for the construction of piers and other waterfront
structures. The main concern related to wood piles is deterioration due to
marine borers, which limits the lifespan and requires frequent repair and replacement. Furthermore, since the use of preservative treatments for wood piles has been reduced due to environmental concerns, there is a current need for efficient methods for wood pile protection.
Marine borer activity in Maine coastal waters was assessed through a survey directed to harbor masters correlated with historic data. In order to illustrate the type and extent of wood pile deterioration, two case studies in Maine harbors are presented. A special prefabricated Fiber Reinforced Polymer (FRP) composite shield or jacket was developed to repair wood piles in the field. FRP composite shells or sleeves are bonded with an underwater curing adhesive to form a shield. The main concern for durability of the adhesive bond is the resistance to freeze-thaw cycles. To assess adhesive bond durability, single lap shear tests were performed after exposure to freeze-thaw cycles. Two types of load-transfer mechanisms between the wood pile and the FRP composite shield were developed and tested: (1) cement-based structural grout; and (2) steel shear connectors with an expanding polyurethane chemical grout. Push-out tests by compression loading were performed to characterize the interfaces and discriminate the effect of the design parameters. The outcome of the push-out tests was the evaluation of the shear force-slip non-linear response and the progressive failure mechanism. The structural response of full-size pre-damaged wood piles repaired with the FRP composite shield system was characterized. A three-point bending test procedure was used to simulate the response of a pile subjected to lateral loads. The loaddeformation response, deflected shape profile, relative longitudinal displacements (slip), strain distribution, ultimate bending moment capacity and mode of failure were evaluated. Wood piles were pre-damaged by reducing approximately 60% of the crosssection over a portion of the pile. It was found that a pre-damaged wood pile repaired using the FRP composite shield with cement-based grout exceeded the bending capacity of a reference wood pile. The repair system using the FRP composite shield with steel shear connectors and polyurethane grout did not fully restore the bending capacity of a reference wood pile; however it can be used for
marine borer protection when wood damage is not critical. A beam structural model to predict stiffness and strength properties of wood piles restored with FRP composite shells was developed. The model accounts for different pile dimensional properties and various amounts of pre-damage. The structural model was successfully correlated with experimental data from three-point bending tests of wood piles.
Advisors/Committee Members: Roberto Lopez-Anido, Thomas C. Sandford, Barry Goodel.
Subjects/Keywords: Waterfront structures; Wood piles; Marine borers; Civil and Environmental Engineering
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APA (6th Edition):
Michael, A. P. (2002). Repair of Wood Piles with Fiber Reinforced Composites. (Masters Thesis). University of Maine. Retrieved from https://digitalcommons.library.umaine.edu/etd/156
Chicago Manual of Style (16th Edition):
Michael, Antonis Petrou. “Repair of Wood Piles with Fiber Reinforced Composites.” 2002. Masters Thesis, University of Maine. Accessed March 04, 2021.
https://digitalcommons.library.umaine.edu/etd/156.
MLA Handbook (7th Edition):
Michael, Antonis Petrou. “Repair of Wood Piles with Fiber Reinforced Composites.” 2002. Web. 04 Mar 2021.
Vancouver:
Michael AP. Repair of Wood Piles with Fiber Reinforced Composites. [Internet] [Masters thesis]. University of Maine; 2002. [cited 2021 Mar 04].
Available from: https://digitalcommons.library.umaine.edu/etd/156.
Council of Science Editors:
Michael AP. Repair of Wood Piles with Fiber Reinforced Composites. [Masters Thesis]. University of Maine; 2002. Available from: https://digitalcommons.library.umaine.edu/etd/156
Syracuse University
21.
Horst, Andrew Jay.
Structure and Accretion at Mid-Ocean Ridges With High Magma Supply: Perspectives From Seafloor Escarpments and Iceland.
Degree: PhD, Earth Sciences, 2013, Syracuse University
URL: https://surface.syr.edu/ear_etd/30
► Despite vast amounts of data about the ocean floor, very little is known about processes operating at mid-ocean ridge spreading centers and the generation…
(more)
▼ Despite vast amounts of data about the ocean floor, very little is known about processes operating at mid-ocean ridge spreading centers and the generation of oceanic lithosphere that covers approximately 2/3 of Earth's surface. In particular, geologist are uncertain about specific details of magmatic and tectonic processes beneath these divergent plate boundaries and how these processes may vary along the spreading axis. Investigations that combine geologic relationships and magnetic properties continue to yield fundamental tools for understanding and constraining seafloor spreading processes. This thesis contains a collection of studies designed to characterize structural geology and magnetic properties of oceanic crust formed in regions with high magma supply. A brief overview is provided in an introduction to three separate chapters that are considered individual contributions. Chapter one presents paleomagnetic and structural data from sheeted dikes that are used in combination with regional geologic relationships to constrain the deformation and tectonic history of oceanic crust exposed at the tip of a propagating rift on the East Pacific Rise. Chapter two describes the magnetic fabrics of sheeted dikes from seafloor exposures that provide evidence for a wide range of magma flow directions beneath fast-spreading ridges with high and relatively continuous magma supply. Chapter three provides paleomagnetic evidence to support structural observations for significant rotations of crustal blocks within a migrating transform fault zone in North Iceland that may exhibit similar kinematics to other oceanic transforms.
Advisors/Committee Members: Jeffrey A. Karson.
Subjects/Keywords: Anisotropy of magnetic susceptibility; Marine magnetics and paleomagnetics; Mid-ocean ridge processes; Oceanic structures; Paleomagnetism applied to geologic processes; Transform faults; Earth Sciences
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APA (6th Edition):
Horst, A. J. (2013). Structure and Accretion at Mid-Ocean Ridges With High Magma Supply: Perspectives From Seafloor Escarpments and Iceland. (Doctoral Dissertation). Syracuse University. Retrieved from https://surface.syr.edu/ear_etd/30
Chicago Manual of Style (16th Edition):
Horst, Andrew Jay. “Structure and Accretion at Mid-Ocean Ridges With High Magma Supply: Perspectives From Seafloor Escarpments and Iceland.” 2013. Doctoral Dissertation, Syracuse University. Accessed March 04, 2021.
https://surface.syr.edu/ear_etd/30.
MLA Handbook (7th Edition):
Horst, Andrew Jay. “Structure and Accretion at Mid-Ocean Ridges With High Magma Supply: Perspectives From Seafloor Escarpments and Iceland.” 2013. Web. 04 Mar 2021.
Vancouver:
Horst AJ. Structure and Accretion at Mid-Ocean Ridges With High Magma Supply: Perspectives From Seafloor Escarpments and Iceland. [Internet] [Doctoral dissertation]. Syracuse University; 2013. [cited 2021 Mar 04].
Available from: https://surface.syr.edu/ear_etd/30.
Council of Science Editors:
Horst AJ. Structure and Accretion at Mid-Ocean Ridges With High Magma Supply: Perspectives From Seafloor Escarpments and Iceland. [Doctoral Dissertation]. Syracuse University; 2013. Available from: https://surface.syr.edu/ear_etd/30
Florida Atlantic University
22.
Cribbs, Allison Rose.
Model analysis of a mooring system for an ocean current turbine testing platform.
Degree: M.S.C.S., 2010, Florida Atlantic University
URL: http://purl.flvc.org/FAU/2974432
► Summary: In response to Florida's growing energy needs and drive to develop renewable power, Florida Atlantic Universitys Center for Ocean Energy Technology (COET) plans to…
(more)
▼ Summary: In response to Florida's growing energy needs and drive to develop renewable power, Florida Atlantic Universitys Center for Ocean Energy Technology (COET) plans to moor a 20 kW test turbine in the Florida Current. No permanent mooring systems for deepwater hydrokinetic turbines have been constructed and deployed, therefore little if anything is known about the performance of these moorings. To investigate this proposed mooring system, a numeric model is developed and then used to predict the static and dynamic behavior of the mooring system and attachments. The model has been created in OrcaFlex and includes two surface buoys and an operating turbine. Anchor chain at the end of the mooring line develops a catenary, providing compliance. Wind, wave, and current models are used to represent the environmental conditions the system is expected to experience and model the dynamic effects on the system. The model is then used to analyze various components of the system. The results identify that a mooring attachment point 1.25 m forward of the center of gravity on the mooring buoy is ideal, and that the OCDP and turbine tether lengths should be no shorter than 25 and 44 m, respectively. Analysis performed for the full system identify that the addition of the floats decreases the tension at the MTB attachment location by 26.5 to 29.5% for minimum current, and 0.10 to 0.31% for maximum current conditions.
Electronic reproduction. Boca Raton, Fla., 2010.
Subjects/Keywords: Marine turbines – Mathematical models; Structural dynamics; Rotors – Design and construction; Offshore structures – Testing
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APA (6th Edition):
Cribbs, A. R. (2010). Model analysis of a mooring system for an ocean current turbine testing platform. (Masters Thesis). Florida Atlantic University. Retrieved from http://purl.flvc.org/FAU/2974432
Chicago Manual of Style (16th Edition):
Cribbs, Allison Rose. “Model analysis of a mooring system for an ocean current turbine testing platform.” 2010. Masters Thesis, Florida Atlantic University. Accessed March 04, 2021.
http://purl.flvc.org/FAU/2974432.
MLA Handbook (7th Edition):
Cribbs, Allison Rose. “Model analysis of a mooring system for an ocean current turbine testing platform.” 2010. Web. 04 Mar 2021.
Vancouver:
Cribbs AR. Model analysis of a mooring system for an ocean current turbine testing platform. [Internet] [Masters thesis]. Florida Atlantic University; 2010. [cited 2021 Mar 04].
Available from: http://purl.flvc.org/FAU/2974432.
Council of Science Editors:
Cribbs AR. Model analysis of a mooring system for an ocean current turbine testing platform. [Masters Thesis]. Florida Atlantic University; 2010. Available from: http://purl.flvc.org/FAU/2974432
23.
King, Joshua David.
Using a 3D finite element forward modeling code to analyze resistive structures with controlled-source electromagnetics in a marine environment.
Degree: MS, Geophysics, 2005, Texas A&M University
URL: http://hdl.handle.net/1969.1/1371
► Controlled-Source Electromagnetics (CSEM) is a method that has been used since the 1980s in the marine environment for determining electrical properties of the subsurface. Receivers…
(more)
▼ Controlled-Source Electromagnetics (CSEM) is a method that has been used since the 1980s in the
marine environment for determining electrical properties of the subsurface. Receivers on the seafloor collect total electric and magnetic fields which are produced as a result of interaction of the transmitter generated primary fields with the seawater and subsurface. Badea et al. (2001) coded an existing algorithm for solving Maxwells equations. This finite element 3D forward modeling algorithm is used to simulate CSEM experiments. The objective of the present study is to model the changes in electromagnetic response for a resistive disk and a more geometrically complex structure, which are rough approximations of hydrocarbon reservoirs. The parameters that are varied in studying these subsurface
structures are the disk radius, disk depth, the transmitter frequency, the transmitter location, and the structure orientation.The results showed that a disk of finite radius behaves similar to an infinite disk at short range and grades into double half-space behavior at longer ranges. The frequency of the transmitter must be tuned to the disk depth as certain frequencies will penetrate too shallow or too deep to probe the disk. Moving the transmitter away from the receivers causes a decrease in signal strength, but exhibits a greater capacity to distinguish between the double half-space and infinite disk scenarios. The disk was then replaced by a more complex structure. To determine if the 3D nature of the structure may be located a study was undertaken to probe the structure from different perspectives using different transmitter locations and azimuths. It is determined that the 3D nature of the structure could not be observed until the structures thickness is sufficiently large.The goal of the study is to better understand the effect of subsurface parameters on the total fields and show the usefulness of the 3D forward modeling code. Understanding the relationships between these parameters and the resulting signals is important in terms of setting up a real experiment.
Marine CSEM studies are costly and using a valuable tool such as an accurate finite element 3D forward modeling algorithm may save time and money.
Advisors/Committee Members: Everett, Mark E. (advisor), Sparks, David (committee member), Sassen, Roger (committee member), Bryant, William (committee member).
Subjects/Keywords: electromagnetic methods; marine geophysics; 3D forward modeling; resistive structures
…modeling the EM response from a marine
geological formation with embedded resistive structures… …for
petroleum studies.
The use of MT as a shallow marine investigative tool was emphasized… …and other
marine environments. Hydrothermal mounds have been studied with CSEM methods
(… …forward modeling for its use in marine petroleum exploration.
The intent of this study is to… …marine CSEM experiment and also to
assess the utility of the 3D forward code.
4
1.2…
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APA (6th Edition):
King, J. D. (2005). Using a 3D finite element forward modeling code to analyze resistive structures with controlled-source electromagnetics in a marine environment. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/1371
Chicago Manual of Style (16th Edition):
King, Joshua David. “Using a 3D finite element forward modeling code to analyze resistive structures with controlled-source electromagnetics in a marine environment.” 2005. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/1371.
MLA Handbook (7th Edition):
King, Joshua David. “Using a 3D finite element forward modeling code to analyze resistive structures with controlled-source electromagnetics in a marine environment.” 2005. Web. 04 Mar 2021.
Vancouver:
King JD. Using a 3D finite element forward modeling code to analyze resistive structures with controlled-source electromagnetics in a marine environment. [Internet] [Masters thesis]. Texas A&M University; 2005. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/1371.
Council of Science Editors:
King JD. Using a 3D finite element forward modeling code to analyze resistive structures with controlled-source electromagnetics in a marine environment. [Masters Thesis]. Texas A&M University; 2005. Available from: http://hdl.handle.net/1969.1/1371
Virginia Tech
24.
Harne, Ryan.
Novel Lightweight Noise and Vibration Control Treatments for Marine Structures.
Degree: MS, Mechanical Engineering, 2009, Virginia Tech
URL: http://hdl.handle.net/10919/34621
► This thesis presents the development and testing of distributed vibration absorber designs with specific application to heavy plates for the reduction of vibration and sound…
(more)
▼ This thesis presents the development and testing of distributed vibration absorber designs with specific application to heavy plates for the reduction of vibration and sound radiation. Two particular designs, already under investigation for use on thin panels or composite materials, were adapted to passively reduce broadband vibration and noise from large and heavy plates. These absorbers are referred to as Distributed Vibration Absorbers [DVAs] and Heterogeneous [HG] Blankets. Numerical models were developed, based on the theory of sound propagation through layered media and the vibration of plates, to simulate the performance of such absorbers for a variety of applications and media characteristics. The new absorber designs were then tested on a large,
marine-type plate (4 feet by 2 feet by 1/4 inch) and showed both broadband noise and vibration control from 60 Hz to 5 kHz. DVAs could reduce the vibrating plate resonance magnitudes on the order of 15 dB at their tuning frequencies while providing overall vibration reduction of 5 dB or greater at higher frequencies. HG blankets were also capable of reducing plate resonance vibration up to 15 dB at their tuning frequencies and produced overall vibration reduction of 5 dB at higher frequencies. These absorbers are entirely passive, i.e. requiring no controller or prior modal testing of the structure, were placed randomly during testing, and are designed to contribute less than 10% additional mass to the structure, making them a robust vibration and noise control solution.
Advisors/Committee Members: Fuller, Christopher R. (committeechair), Papenfuss, Cory M. (committee member), Johnson, Martin E. (committee member).
Subjects/Keywords: marine structures; passive vibration control; broadband noise control; HG blankets; distributed vibration absorbers
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APA (6th Edition):
Harne, R. (2009). Novel Lightweight Noise and Vibration Control Treatments for Marine Structures. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/34621
Chicago Manual of Style (16th Edition):
Harne, Ryan. “Novel Lightweight Noise and Vibration Control Treatments for Marine Structures.” 2009. Masters Thesis, Virginia Tech. Accessed March 04, 2021.
http://hdl.handle.net/10919/34621.
MLA Handbook (7th Edition):
Harne, Ryan. “Novel Lightweight Noise and Vibration Control Treatments for Marine Structures.” 2009. Web. 04 Mar 2021.
Vancouver:
Harne R. Novel Lightweight Noise and Vibration Control Treatments for Marine Structures. [Internet] [Masters thesis]. Virginia Tech; 2009. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10919/34621.
Council of Science Editors:
Harne R. Novel Lightweight Noise and Vibration Control Treatments for Marine Structures. [Masters Thesis]. Virginia Tech; 2009. Available from: http://hdl.handle.net/10919/34621
Virginia Tech
25.
Spradlin, Warren Edward II.
A Perceptional Comparison of Wood in Separate Infrastructure Markets.
Degree: MS, Wood Science and Forest Products, 1998, Virginia Tech
URL: http://hdl.handle.net/10919/9784
► Decision-makers involved in material choice decisions in the United States infrastructure were surveyed to identify factors which are important in the material choice decision and…
(more)
▼ Decision-makers involved in material choice decisions in the United States infrastructure were surveyed to identify factors which are important in the material choice decision and to determine the perceptions of wood in various infrastructure applications. This information led to the development of strategies to increase the use of wood in infrastructure markets across the US. The highway,
marine/inland waterway, railroad and utility systems composed the four markets representing the US infrastructure. A total of 2344 questionnaires were mailed nationwide. The perceptions of wood were further defined through personal interviews with 112 individuals in four geographically dispersed states.
The most important factors in material choice decisions were durability, maintenance and cost. Environmental impact, ease of design and innovativeness of material were less important in the material choice decision. Highway and
marine/inland waterway respondents perceived wood to be among the lowest materials in overall performance. Railroad and utility respondents perceived wood to have significantly better overall performance than highway and
marine/inland waterway respondents.
Respondents perceived wood's advantages to be its aesthetically pleasing appearance, low initial cost, ease in repair and ease in field modification. They perceived the disadvantages of wood to be high life-cycle costs, high maintenance requirements and low biological decay resistance. Several strategies are suggested to increase wood use in infrastructure, including: greater market approach by the wood products industry, improved timber structure design details, and increased service life of wood through improved chemical preservative treatments.
Advisors/Committee Members: Smith, Robert L. (committeechair), Lamb, Fred M. (committee member), Bush, Robert J. (committee member).
Subjects/Keywords: Wood; Infrastructure; Highway; Marine; Inland; Waterway; Railroad; Utility; Structures; Perceptions; Factors; Materials
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APA (6th Edition):
Spradlin, W. E. I. (1998). A Perceptional Comparison of Wood in Separate Infrastructure Markets. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/9784
Chicago Manual of Style (16th Edition):
Spradlin, Warren Edward II. “A Perceptional Comparison of Wood in Separate Infrastructure Markets.” 1998. Masters Thesis, Virginia Tech. Accessed March 04, 2021.
http://hdl.handle.net/10919/9784.
MLA Handbook (7th Edition):
Spradlin, Warren Edward II. “A Perceptional Comparison of Wood in Separate Infrastructure Markets.” 1998. Web. 04 Mar 2021.
Vancouver:
Spradlin WEI. A Perceptional Comparison of Wood in Separate Infrastructure Markets. [Internet] [Masters thesis]. Virginia Tech; 1998. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10919/9784.
Council of Science Editors:
Spradlin WEI. A Perceptional Comparison of Wood in Separate Infrastructure Markets. [Masters Thesis]. Virginia Tech; 1998. Available from: http://hdl.handle.net/10919/9784
Virginia Tech
26.
Kim, Myung-Hyun.
Nonlinear Control and Robust Observer Design for Marine Vehicles.
Degree: PhD, Engineering Mechanics, 2000, Virginia Tech
URL: http://hdl.handle.net/10919/29910
► A robust nonlinear observer, utilizing the sliding mode concept, is developed for the dynamic positioning of ships. The observer provides the estimates of linear velocities…
(more)
▼ A robust nonlinear observer, utilizing the sliding mode concept, is developed for the dynamic positioning of ships. The observer provides the estimates of linear velocities of the ship and bias from the slowly varying environmental loads. It also filters out wave frequency motion to avoid wear of actuators and excessive fuel consumption. Especially, the observer structure with a saturation function makes the proposed observer robust against neglected nonlinearties, disturbances and uncertainties.
A direct adaptive neural network controller is developed for a model of an underwater vehicle. Radial basis neural network and multilayer neural network are used in the closed-loop to approximate the nonlinear vehicle dynamics. No prior off-line training phase and no explicit knowledge of the structure of the plant are required, and this scheme exploits the advantages of both neural network control and adaptive control. A control law and a stable on-line adaptive law are derived using the Lyapunov theory, and the convergence of the tracking error to zero and the boundedness of signals are guaranteed. Comparison of the results with different neural network architectures is made, and performance of the controller is demonstrated by computer simulations.
The sliding mode observer is used to eliminate observation spillovers in the vibration control of flexible
structures. It is common to build a state feedback controller and a state estimator based on the mathematical model of the system with a finite number of vibration modes, but this may cause control and observation spillover due to the residual (uncontrolled) modes. The performance of a sliding mode observer is compared with that of a conventional Kalman filter in order to demonstrate robustness and disturbance decoupling characteristics. Simulation and experimental results using the sliding mode observer are presented for the active vibration control of a cantilever beam using smart materials.
Advisors/Committee Members: Inman, Daniel J. (committeechair), Meirovitch, Leonard (committee member), Kohler, Werner E. (committee member), Hendricks, Scott L. (committee member), Batra, Romesh C. (committee member).
Subjects/Keywords: Vibration Control; Nonlinear Control; Marine Vehicles; Smart Structures; Neural Networks; Nonlinear Observer
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APA (6th Edition):
Kim, M. (2000). Nonlinear Control and Robust Observer Design for Marine Vehicles. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/29910
Chicago Manual of Style (16th Edition):
Kim, Myung-Hyun. “Nonlinear Control and Robust Observer Design for Marine Vehicles.” 2000. Doctoral Dissertation, Virginia Tech. Accessed March 04, 2021.
http://hdl.handle.net/10919/29910.
MLA Handbook (7th Edition):
Kim, Myung-Hyun. “Nonlinear Control and Robust Observer Design for Marine Vehicles.” 2000. Web. 04 Mar 2021.
Vancouver:
Kim M. Nonlinear Control and Robust Observer Design for Marine Vehicles. [Internet] [Doctoral dissertation]. Virginia Tech; 2000. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/10919/29910.
Council of Science Editors:
Kim M. Nonlinear Control and Robust Observer Design for Marine Vehicles. [Doctoral Dissertation]. Virginia Tech; 2000. Available from: http://hdl.handle.net/10919/29910
Texas A&M University
27.
Yen, Shihchieh.
Prediction of sinkage depth of footings on soft marine sediments.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1990-THESIS-Y45
Subjects/Keywords: civil engineering.; Major civil engineering.; Hydraulic structures - Foundations.; Settlement of structures.; Marine sediments - Testing.
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APA (6th Edition):
Yen, S. (2012). Prediction of sinkage depth of footings on soft marine sediments. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1990-THESIS-Y45
Chicago Manual of Style (16th Edition):
Yen, Shihchieh. “Prediction of sinkage depth of footings on soft marine sediments.” 2012. Masters Thesis, Texas A&M University. Accessed March 04, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-1990-THESIS-Y45.
MLA Handbook (7th Edition):
Yen, Shihchieh. “Prediction of sinkage depth of footings on soft marine sediments.” 2012. Web. 04 Mar 2021.
Vancouver:
Yen S. Prediction of sinkage depth of footings on soft marine sediments. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1990-THESIS-Y45.
Council of Science Editors:
Yen S. Prediction of sinkage depth of footings on soft marine sediments. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1990-THESIS-Y45
28.
Scherrer, Roch.
Analyse du comportement vibro-acoustique de structures immergées excitées par des sources transitoires : Analysis of the vibroacoustic behaviour of sumberged structures excited by transient sources.
Degree: Docteur es, Acoustique, 2015, INSA Lyon
URL: http://www.theses.fr/2015ISAL0037
► Dans le cadre de la lutte en mer, la détection acoustique des structures immergées s’effectue généralement sur des signaux stationnaires. Une nouvelle génération de sonars…
(more)
▼ Dans le cadre de la lutte en mer, la détection acoustique des structures immergées s’effectue généralement sur des signaux stationnaires. Une nouvelle génération de sonars permet de détecter sur des signaux transitoires. Ceci implique de compléter le processus de conception des projets industriels qui ne tient compte d’exigences qu'en matière de bruits rayonnés en régime stationnaire. Il est donc nécessaire de comprendre les mécanismes de transfert des sources de bruit transitoires sur les structures immergées. Cette thèse s’inscrit dans ce cadre et consiste à étudier les mécanismes de transfert vibratoire et de rayonnement acoustique qui peuvent intervenir sur ces structures lorsque l’excitation est transitoire. L’analyse porte sur différents éléments de la chaine de transfert : le rayonnement dans l’eau du bordé, la diffraction des ondes par les raidisseurs, et le comportement résonnant des structures internes supportant les matériels. Le premier chapitre présente une analyse bibliographique autour de l’étude des phénomènes vibroacoustiques transitoires des structures immergées, de l’influence d’un fluide lourd sur le comportement vibroacoustique des plaques, et des méthodes de calcul vibroacoustiques en régime transitoire. Dans le second chapitre nous étudions la réponse transitoire d’une plaque infinie immergée soumise à une force impulsionnelle ponctuelle. La méthode de calcul s’appuie sur les calculs spectraux fréquences-nombre d’onde. Les réponses temporelles sont obtenues par transformées de Fourier inverses. L’analyse des spectres et des réponses temporelles de l’accélération vibratoire de la plaque et de la pression rayonnée, met en évidence l’influence de la présence du fluide. La prise en compte de l’inertie rotationnelle et du cisaillement à travers le modèle de plaque de Mindlin-Timoshenko est également étudiée. Ces résultats sont confrontés à une expérimentation présentée dans le troisième chapitre. La structure étudiée est une plaque rectangulaire posée horizontalement à la surface d’une cuve remplie d’eau. Deux types de sources transitoires sont utilisés : marteau de choc, lâché d’une bille. La comparaison des résultats numériques et expérimentaux montre que l’on retrouve certains phénomènes évoqués précédemment. L’effet des raidisseurs sur le rayonnement acoustique fait l’objet du quatrième chapitre. Une plaque raidie périodiquement dans une direction est considéré. L’influence des ondes de Bloch-Floquet sur la réponse temporelle est étudiée. Les résultats sont comparés à des mesures effectuées sur une barge d’essais. Dans le cinquième chapitre, l’effet des structures internes est étudié à partir d’un modèle de plaque couplé à un système résonnant constitué d’un assemblage poutre-plaque. La méthode des inertances est utilisée pour obtenir les forces de couplage entre les différents éléments. Les signaux temporels sont étudiés en fonction de l’importance de la rupture d’inertance entre la plaque et l’assemblage.
In the sea, the acoustic detection of other battle engines is done by detecting mostly…
Advisors/Committee Members: Guyader, Jean-Louis (thesis director), Maxit, Laurent (thesis director).
Subjects/Keywords: Mécanique; Acoustique; Acoustique sous-Marine; Vibrations; Vibroacoustique; Structures immergées; Régime transitoire; Interaction fluide structure; Mesures acoustiques; Mechanics; Acoustic; Sub-Aquatic acoustic; Vibration; Vibroacoustic; Instream structures; Transient response; Fluid-Structure interactions; Acoustic measures; 620.250 72
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APA (6th Edition):
Scherrer, R. (2015). Analyse du comportement vibro-acoustique de structures immergées excitées par des sources transitoires : Analysis of the vibroacoustic behaviour of sumberged structures excited by transient sources. (Doctoral Dissertation). INSA Lyon. Retrieved from http://www.theses.fr/2015ISAL0037
Chicago Manual of Style (16th Edition):
Scherrer, Roch. “Analyse du comportement vibro-acoustique de structures immergées excitées par des sources transitoires : Analysis of the vibroacoustic behaviour of sumberged structures excited by transient sources.” 2015. Doctoral Dissertation, INSA Lyon. Accessed March 04, 2021.
http://www.theses.fr/2015ISAL0037.
MLA Handbook (7th Edition):
Scherrer, Roch. “Analyse du comportement vibro-acoustique de structures immergées excitées par des sources transitoires : Analysis of the vibroacoustic behaviour of sumberged structures excited by transient sources.” 2015. Web. 04 Mar 2021.
Vancouver:
Scherrer R. Analyse du comportement vibro-acoustique de structures immergées excitées par des sources transitoires : Analysis of the vibroacoustic behaviour of sumberged structures excited by transient sources. [Internet] [Doctoral dissertation]. INSA Lyon; 2015. [cited 2021 Mar 04].
Available from: http://www.theses.fr/2015ISAL0037.
Council of Science Editors:
Scherrer R. Analyse du comportement vibro-acoustique de structures immergées excitées par des sources transitoires : Analysis of the vibroacoustic behaviour of sumberged structures excited by transient sources. [Doctoral Dissertation]. INSA Lyon; 2015. Available from: http://www.theses.fr/2015ISAL0037
University of Michigan
29.
Datta, Nabanita.
Hydroelastic Response of Marine Structures to Impact-induced Vibrations. Hydroelastic Reponse of Marine Structures to Impact-induced Vibrations.
Degree: PhD, Naval Architecture & Marine Engineering, 2010, University of Michigan
URL: http://hdl.handle.net/2027.42/78773
► This research deals with the numerical analysis of the hydroelastic behavior of marine vessels under hydrodynamic impact loads, which causes potentially detrimental local flexural vibrations…
(more)
▼ This research deals with the numerical analysis of the hydroelastic behavior of
marine vessels under hydrodynamic impact loads, which causes potentially detrimental local flexural vibrations in the vessel. The objective is to provide the dynamic response spectra for transient water-structure dynamics
subject to typical impact loads and time scales, using one-way coupling between the fluid and the structure. The hydrodynamic pressure is assumed to be applied on the rigid plate, and then the plate is modelled to respond elastically. The structural vibrations are assumed not to influence the hydrodynamic pressure field.
The changing wetted surface is the prime complexity of the problem. The sweeping load sets the plate into small amplitude vibrations, exciting all its natural frequencies (fundamental and overtones). The time-scales of the problem are : (a) the duration of the forcing when sweeping across the plate, and (b) the natural period of the structure. Assuming small deflections of the structure, normal mode summation is used to calculate the vibratory response. The total deflection is assumed to be a series summation of the modal deflections. When the amplitude of the vibrations is small, the dynamic stresses are directly proportional to the flexural displacement.
Two configurations of the moving load, i.e. (i) uniform stretching load and (ii) impact load, are applied. The coupled system of modal governing differential equation is non-dimensionalized in space and time, and the Dynamic Loading Factor (DLF) of the loading is numerically evaluated by the fourth-order Runge-Kutta method. The corresponding static deflections are calculated by Galerkin's method. The ratio of the maximum dynamic deflection to the maximum static deflection is the DLF. This analysis provides recommendations to the structural designer, who typically relies on static analysis. The modal participation spectra relative to the dominant fundamental mode for various impact speeds is used to establish modal truncation guidelines.
The variation of the response with respect to space and time, and with respect to various parameters like the aspect ratio, damping ratio, boundary conditions, and deadrise angles has been studied. The change in natural frequencies of the structure due to these parameters, and immersion, has also been evaluated.
Advisors/Committee Members: Troesch, Armin W. (committee member), Beck, Robert F. (committee member), Epureanu, Bogdan (committee member), Vlahopoulos, Nickolas (committee member).
Subjects/Keywords: Vibrations; Hydroelasticity; Marine Structures; Moving Loads; Hydrodynamic Impact; Normal Mode Analysis; Naval Architecture and Marine Engineering; Engineering
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APA (6th Edition):
Datta, N. (2010). Hydroelastic Response of Marine Structures to Impact-induced Vibrations. Hydroelastic Reponse of Marine Structures to Impact-induced Vibrations. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/78773
Chicago Manual of Style (16th Edition):
Datta, Nabanita. “Hydroelastic Response of Marine Structures to Impact-induced Vibrations. Hydroelastic Reponse of Marine Structures to Impact-induced Vibrations.” 2010. Doctoral Dissertation, University of Michigan. Accessed March 04, 2021.
http://hdl.handle.net/2027.42/78773.
MLA Handbook (7th Edition):
Datta, Nabanita. “Hydroelastic Response of Marine Structures to Impact-induced Vibrations. Hydroelastic Reponse of Marine Structures to Impact-induced Vibrations.” 2010. Web. 04 Mar 2021.
Vancouver:
Datta N. Hydroelastic Response of Marine Structures to Impact-induced Vibrations. Hydroelastic Reponse of Marine Structures to Impact-induced Vibrations. [Internet] [Doctoral dissertation]. University of Michigan; 2010. [cited 2021 Mar 04].
Available from: http://hdl.handle.net/2027.42/78773.
Council of Science Editors:
Datta N. Hydroelastic Response of Marine Structures to Impact-induced Vibrations. Hydroelastic Reponse of Marine Structures to Impact-induced Vibrations. [Doctoral Dissertation]. University of Michigan; 2010. Available from: http://hdl.handle.net/2027.42/78773
30.
Al-Dodoee, Omar Hashim Hassoon.
Conception et optimisation des matériaux et structures composites pour des applications navales : effet du slamming : Design and optimisation the composite material structures for naval applications : effects of slamming.
Degree: Docteur es, Génie mécanique, mécanique des fluides et énergétique, 2017, Brest
URL: http://www.theses.fr/2017BRES0050
► L'interaction fluide-structure vise à étudier le contact entre un fluide et un solide. Ce phénomène est très présent lors de l’impact d’une vague sur une…
(more)
▼ L'interaction fluide-structure vise à étudier le contact entre un fluide et un solide. Ce phénomène est très présent lors de l’impact d’une vague sur une structure ou l’inverse. La réponse de la structure peut être fortement affectée par l'action du fluide. L'étude de ce type d'interaction est motivée par le fait que les phénomènes résultants sont parfois catastrophiques pour les
structures composites ou constituent dans la majorité des cas un facteur dimensionnant important. Le fluide est caractérisé par son champ de vitesse et de pression. Il exerce des forces aérodynamiques ou hydrodynamiques sur l'interface de la structure qui subit des déformations sous leurs actions. Ces déformations peuvent affecter localement le champ de l'écoulement et donc les charges appliquées. Ce cycle des interactions entre le fluide et le solide est caractéristique du phénomène de slamming. Pour une conception optimale des
structures marines, la vitesse du navire est devenue un paramètre important. Par conséquent, les exigences de conception ont été optimisées par rapport au poids structurel. D'autre part, l'apparition des
structures composites au cours des dernières décennies a favorisé l'exploitation de ces matériaux dans les grands projets de construction pour les applications marines et aérospatiales. Ceci est dû à la nature de leurs propriétés mécaniques, car elles présentent un rapport rigidité / poids élevé. En revanche, l'interaction entre les
structures déformables et la surface libre de l'eau peut affecter le flux du fluide en contact avec la structure ainsi que et les charges hydrodynamiques estimées par rapport au corps rigide, en raison de l'apparition des effets hydro-élastiques. En outre, ces
structures sont toujours soumises à des mécanismes de dommages différents et complexes sous un chargement dynamique. Pour ces raisons, la flexibilité et les modes de défaillance dans les matériaux composites présentent une complexité supplémentaire pour prédire les charges hydrodynamiques lorsqu'il y a une interaction avec un fluide (l'eau). Ceci a présenté un défi majeur pour utiliser ces matériaux dans les applications maritimes. Par conséquent, une attention particulière doit être accordée dans la phase de conception et l'analyse des performances pendant l'utilisation à vie. Les principales contributions de ce travail sont l’étude expérimentale et numérique du comportement dynamique des panneaux composites et la quantification de l'effet de la flexibilité de ces panneaux composites sur les charges hydrodynamiques et les déformations résultantes. Pour étudier ces effets, des panneaux composites stratifiés et sandwichs avec deux rigidités différentes sont soumis à diverses vitesses d'impact à l'aide d'une machine de choc équipée d'un système de contrôle de la vitesse. La résistance dynamique a été analysée en termes de charges hydrodynamiques, de déformations dynamiques et de mécanismes de défaillance pour différentes vitesses d'impact. L'analyse des résultats expérimentaux a montré que l’effort maximal augmente avec l’augmentation…
Advisors/Committee Members: Tarfaoui, Mostapha (thesis director), El Malki Alaoui, Aboulghit (thesis director).
Subjects/Keywords: Structures composites; Applications marines; Interaction fluide-structure; Effet du tossage; Chargement dynamique; Vitesse constante; Investigation expérimentale et numérique; Réponse structurelle; Effets hydro-élastiques; Mécanismes d’endommagement; Composite structures; Marine Application; Fluid-Structure Interaction; Slamming effect; Dynamic loading; Constant velocity; Experimental and numerical investigation; Structural response; Hydroelastic effects; Damage mechanisms; 620.112
Record Details
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Record Details
Similar Records
Cite
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Al-Dodoee, O. H. H. (2017). Conception et optimisation des matériaux et structures composites pour des applications navales : effet du slamming : Design and optimisation the composite material structures for naval applications : effects of slamming. (Doctoral Dissertation). Brest. Retrieved from http://www.theses.fr/2017BRES0050
Chicago Manual of Style (16th Edition):
Al-Dodoee, Omar Hashim Hassoon. “Conception et optimisation des matériaux et structures composites pour des applications navales : effet du slamming : Design and optimisation the composite material structures for naval applications : effects of slamming.” 2017. Doctoral Dissertation, Brest. Accessed March 04, 2021.
http://www.theses.fr/2017BRES0050.
MLA Handbook (7th Edition):
Al-Dodoee, Omar Hashim Hassoon. “Conception et optimisation des matériaux et structures composites pour des applications navales : effet du slamming : Design and optimisation the composite material structures for naval applications : effects of slamming.” 2017. Web. 04 Mar 2021.
Vancouver:
Al-Dodoee OHH. Conception et optimisation des matériaux et structures composites pour des applications navales : effet du slamming : Design and optimisation the composite material structures for naval applications : effects of slamming. [Internet] [Doctoral dissertation]. Brest; 2017. [cited 2021 Mar 04].
Available from: http://www.theses.fr/2017BRES0050.
Council of Science Editors:
Al-Dodoee OHH. Conception et optimisation des matériaux et structures composites pour des applications navales : effet du slamming : Design and optimisation the composite material structures for naval applications : effects of slamming. [Doctoral Dissertation]. Brest; 2017. Available from: http://www.theses.fr/2017BRES0050
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Open Access Theses and Dissertations
