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Relevant bibliographies by topics / Tonga Arc

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Academic literature on the topic 'Tonga Arc'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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Journal articles on the topic "Tonga Arc"

1

Cooper, L. B., T. Plank, and R. J. Arculus. "High water contents in Tonga arc magmas." Geochimica et Cosmochimica Acta 70, no. 18 (August 2006): A111. http://dx.doi.org/10.1016/j.gca.2006.06.136.

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Conder, James A., and Douglas A. Wiens. "Rapid mantle flow beneath the Tonga volcanic arc." Earth and Planetary Science Letters 264, no. 1-2 (December 2007): 299–307. http://dx.doi.org/10.1016/j.epsl.2007.10.014.

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Cho, Hyen Goo, Dong-Ho Kim, Hyo Jin Koo, In Kwon Um, and Hunsoo Choi. "Hydrothermal Alteration around the Tofua Arc (TA) 25 Seamounts in Tonga Arc." Journal of the Mineralogical Society of Korea 27, no. 4 (December 30, 2014): 169–81. http://dx.doi.org/10.9727/jmsk.2014.27.4.169.

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Luo, Qing, and Guoliang Zhang. "Control of subduction rate on Tonga-Kermadec arc magmatism." Journal of Oceanology and Limnology 36, no. 3 (May 2018): 687–99. http://dx.doi.org/10.1007/s00343-018-7026-8.

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Bevis, Michael, F. W. Taylor, B. E. Schutz, Jacques Recy, B. L. Isacks, Saimone Helu, Rajendra Singh, et al. "Geodetic observations of very rapid convergence and back-arc extension at the Tonga arc." Nature 374, no. 6519 (March 1995): 249–51. http://dx.doi.org/10.1038/374249a0.

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Myeong, Bora, Jonguk Kim, Jung Hoon Kim, and Yun Deuk Jang. "Petrogenesis of subduction-related lavas from the southern Tonga arc." Journal of Asian Earth Sciences 188 (February 2020): 104089. http://dx.doi.org/10.1016/j.jseaes.2019.104089.

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Yoo, Bong-Chul, Hun-Soo Choi, and Sang-Mo Koh. "Element Dispersion and Wallrock Alteration of TA26 Seamount, Tonga Arc." Economic and Environmental Geology 44, no. 5 (October 28, 2011): 359–72. http://dx.doi.org/10.9719/eeg.2011.44.5.359.

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Giardini, D., and J. H. Woodhouse. "Horizontal shear flow in the mantle beneath the Tonga arc." Nature 319, no. 6054 (February 1986): 551–55. http://dx.doi.org/10.1038/319551a0.

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Wu, Fei, Simon Turner, and Bruce F. Schaefer. "Mélange versus fluid and melt enrichment of subarc mantle: A novel test using barium isotopes in the Tonga-Kermadec arc." Geology 48, no. 11 (June 25, 2020): 1053–57. http://dx.doi.org/10.1130/g47549.1.

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Abstract In the past few years, the so-called mélange model has been offered as an alternative to the long-standing model of enrichment of the subarc mantle by separate additions of fluid and sediment components from the subducting plate. In the mélange model, components from the subducting plate become physically mixed at the slab-mantle interface. Partial melting of the peridotite subsequently occurs after being hybridized by the mélange material that diapirically rises into hotter portions of the wedge. Here, we present the first Ba isotope study of lavas from the Tonga-Kermadec arc (southwest Pacific Ocean) and show that Ba isotopes distinguish between fluid and melt derived from different subducted components. This provides fresh constraints on the debate. Remarkable along-strike Ba isotope variations were observed and are best explained by contributions from variable proportions of sediment and altered oceanic crust (AOC) fluid from the subducting plate. Combined Ba-Sr-Pb isotope relationships indicate that sediment melt and AOC fluid were added to the source of the arc lavas separately at different times. This is inconsistent with the mélange model, at least in this arc.

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Lundgren, Paul R., and Emile A. Okal. "Slab Decoupling in the Tonga Arc: The June 22, 1977, Earthquake." Journal of Geophysical Research: Solid Earth 93, B11 (November 10, 1988): 13355–66. http://dx.doi.org/10.1029/jb093ib11p13355.

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Dissertations / Theses on the topic "Tonga Arc"

1

Wharton, Mark R. "Crustal accretion during the earliest stages of intra-oceanic arc volcanism : examples from Fiji and Tonga, SW Pacific." Thesis, Durham University, 1993. http://etheses.dur.ac.uk/1616/.

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Schönhofen-Romer, Milena Viktoria [Verfasser], Karsten M. [Akademischer Betreuer] Haase, and Christoph [Gutachter] Beier. "Melting and Source Variability in the Tonga- Kermadec-Lau Arc-Backarc System / Milena Viktoria Schönhofen-Romer ; Gutachter: Christoph Beier ; Betreuer: Karsten M. Haase." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2021. http://d-nb.info/1241827362/34.

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Bataille-Benguigui, Marie-Claire. "Les Polynésiens des îles Tonga et leur représentation du milieu marin." Lille 3 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37595743g.

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Cross, Thomas C. (Thomas Clinton). "The Life and Works of Charlotte Elizabeth Tonna: Anglican Evangelical Progressive." Thesis, University of North Texas, 1997. https://digital.library.unt.edu/ark:/67531/metadc278033/.

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Among the British evangelicals of her day, Charlotte Elizabeth Browne Phelan Tonna was one of the most popular. She was an Anglican Evangelical Progressive who through her works of fiction, poetry, tracts, travel accounts, and essays dealing with theology, politics and social criticism convinced fellow evangelicals to get actively involved in the issues that concerned her.

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Almeida, João Paulo Nobre de. "Germinação e crescimento de plântulas de amburana cearensis (Allemão) A.C. smith em função do peso de sementes e fatores abióticos." reponame:Repositório Institucional da UFC, 2014. http://www.repositorio.ufc.br/handle/riufc/16828.

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ALMEIDA, João Paulo Nobre de. Germinação e crescimento de plântulas de amburana cearensis (Allemão) A.C. smith em função do peso de sementes e fatores abióticos. 2014. 109 f. : Dissertação (mestrado) - Universidade Federal do Ceará, centro de Ciências Agrárias, Departamento de Fitotecnia, Curso de Pós-Graduação em Agronomia / Fitotecnia, Fortaleza-CE, 2014
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Given the needs of reclamation is increasing interest in the propagation of native species, which requires basic information about their germination characteristics and ecophysiological. The Amburana cearensis (Allemão) A.C. Smith known as cumaru is a species widely used for restoration of the landscape. The aim of this study was to investigate the germination and seedling growth of cumaru depending on the weight of the seeds under conditions of light, temperature, drought stress, as well as to determine the seed imbibition curve, internal morphology, chemical composition and quantification of the coumarin. Initially seeds were individually weighed and separated into three weight classes (light, medium and heavy), these being submitted to the determination of water content, thousand seeds weight and germination tests in two light conditions (presence and absence ) and six schemes temperatures (20, 25, 30, 35, 40, and 20-30 °C). In addition to these tests, it was determined the imbibition curve of each weight class and made assessment of drought stress tolerance under different potentials(-0.2, -0.4, -0.6, -0.8 and -1,0 MPa). The experiments were arranged in a completely randomized design in four replications for each treatment. For the internal morphology of seeds were used in cytochemistry usual techniques for the identification of the main structures and substances reserves. To visualize the coumarin in the seeds by NMR spectroscopy was used. The optimum conditions for seed germination occurred at 30 °C, which are insensitive to light and vigor seeds for light and medium. The best conditions for seedling growth occurred with the light and medium seeds at 25 and 30 °C and in the presence of light, with temperatures of 35 and 40 °C harmful. Light and medium seeds showed the same pattern of water absorption, while not reach the heavy phase III of the curve. The decrease in the water potential of the substrate affect the germination and growth of seedlings from seed medium and heavy compared to the light, and from -0.6 MPa in a condition strictly limiting seedling development. The chemical constituents present in the seeds of A. cearensis are quantitatively different depending on the weight of the seeds, and the heavy characterized by a high content of lipids. The NMR spectroscopy falls greater proportion of coumarin in seed extract heavy and medium, possibly affecting ecophysiological needs of the species A. cearensis.
Diante das necessidades de recuperação de áreas degradadas é crescente o interesse na propagação de espécies florestais nativas, o que demanda informações básicas sobre as suas características germinativas e ecofisiológicas. A Amburana cearensis (Allemão) A.C. Smith conhecida como cumaru é uma espécie bastante utilizada para recomposição da paisagem. O objetivo deste trabalho foi estudar a germinação e o crescimento de plântulas de cumaru em função do peso das sementes sob diferentes condições de temperatura, luz, estresse hídrico, bem como determinar nas sementes a curva de embebição, morfologia interna, composição química e identificação da cumarina. Inicialmente as sementes foram pesadas individualmente e separadas em três classes de peso (leves, médias e pesadas), sendo estas, submetidas à determinação dos teores de água, peso de mil de sementes e a testes de germinação em duas condições de luz (presença e ausência) e seis regimes de temperatura (20, 25, 30, 35, 40 e 20-30°C). Além destes ensaios, foi determinado a curva de embebição de cada classe de peso e avaliação da tolerância ao estresse hídrico sob diferentes potenciais (-0,2, -0,4, -0,6, -0,8 e -1,0 MPa). Os experimentos foram dispostos em delineamento inteiramente casualizado com quatro repetições para cada tratamento. Para a morfologia interna das sementes foram utilizadas técnicas usuais em citoquímica para a identificação das principais estruturas e substâncias de reservas. Para a visualização da cumarina nas sementes foi utilizada a espectroscopia por RMN. As condições ótimas para a germinação das sementes ocorreu na temperatura de 30°C, sendo estas insensíveis à luz e um maior vigor para sementes leves e médias. As melhores condições para o crescimento das plântulas ocorreram com as sementes leves e médias nas temperaturas de 25 e 30°C e na presença de luz, sendo as temperaturas de 35 e 40 °C prejudiciais. Sementes leves e médias apresentam o mesmo padrão de absorção de água, enquanto as pesadas não atingem a fase III da curva. O decréscimo do potencial hídrico do substrato prejudica a germinação e o crescimento de plântulas oriundas de sementes médias e pesadas em comparação às leves, sendo a partir de -0,6 MPa uma condição estritamente limitante na formação de plântulas. Os constituintes químicos presentes nas sementes de A. cearensis são quantitativamente diferenciados em função do peso das sementes, sendo as pesadas caracterizadas por um elevado teor de lipídios. A espectroscopia por RMN releva uma maior proporção de cumarina no extrato de sementes pesadas e médias, que possivelmente afetam as necessidades ecofisiológicas da espécie A. cearensis.

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Huszai, Villö. "Ekel am Erzählen : Metafiktionalität im Werk Robert Musils, gewonnen am Kriminalfall "Tonka /." München : W. Fink, 2002. http://catalogue.bnf.fr/ark:/12148/cb388611656.

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Dingemanse, Clazina. "Rap van tong, scherp van pen : literaire discussiecultuur in praatjespamfletten (circa 1600-1750) /." Hilversum : Verloren, 2008. http://catalogue.bnf.fr/ark:/12148/cb41288517n.

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Ussery, Erin J. "Optimization of Novel Culturing and Testing Procedures for Acute Effects on Acartia Tonsa and Tisbe Biminiensis." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699989/.

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Copepods comprise an ecologically important role in freshwater and marine ecosystems, which is why they are often considered an important ecotoxicological model organism. The International Organization for Standardization’s (ISO) 14669 protocol is the only guideline for the determination of acute toxicity in three European marine copepod species: Acartia tonsa. The goal of this project was to assess the feasibility of establishing and maintaining cultures of Acartia tonsa, as well as to refine current culturing and egg separation methods. Initial culture methodology proved difficult for consistent production of eggs and collection of nauplii. The development of an airlift system for the separation of eggs from nauplii and adults, based on size, successfully increased the availability of eggs, nauplii and adults. The sensitivity and relative conditions of the copepod species was assessed by running a series of 48h acute toxicity tests with the reference toxicants 3,5-dichlorophenol, 4,4’-methylenebis(2,6-di-tert-butylphenol. The acute 48 hour median lethal dose concentration (LC50), the no observed effect concentration (NOEC), and the lowest observed effect concentration (LOEC) was analyzed for the three reference compounds for of A. tonsa.

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Forget, Nathalie. "Free-Living and Symbiotic Bacterial Communities in Contrasting Hydrothermally Active Habitats." Thesis, 2013. http://hdl.handle.net/1828/4869.

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Prokaryotic microorganisms, which are at the base of deep-sea hydrothermal vent food webs, adapt rapidly to environmental fluctuations. This study aimed at comparing bacterial communities in contrasting hydrothermal habitats to better understand compositional adaptations to local conditions. I first used small subunit (SSU) ribosomal RNA (rRNA) gene sequences to compare mat-forming bacterial communities associated with iron oxides at two hydrothermal vent sites on the Tonga Arc, southwest Pacific. Operational taxonomic units (OTUs), defined at 97% sequence similarity, were affiliated to a great diversity of autotrophic and heterotrophic groups. Metabolically diverse Gammaproteobacteria dominated the sample from Volcano 19, collected at 992 m depth. The sample from Volcano 1, collected at 197 m depth, was dominated by iron-oxidizing bacteria from the class Zetaproteobacteria. The depth of the sampling sites was proposed to explain clone library dissimilarities. In the following studies, I compared bacterial communities associated with the vestimentiferan tubeworm Ridgeia piscesae, a foundation species at the Juan de Fuca Ridge. Samples of the polychaete were collected from tubeworm habitats in contrasting flow regimes that influenced temperature and hydrogen sulphide concentrations. Free-living bacteria were analyzed using both sequencing and 454 pyrosequencing of the SSU rRNA gene. Statistical analyses suggested a predictable pattern of bacterial community composition for the two habitats, with higher proportions of sulphur and hydrogen oxidizers in High Flow and more heterotrophic groups in Low Flow environments. Temperature, available energy for metabolism, and stability of the habitat were suggested to explain these distinctive bacterial communities. Symbiotic assemblages were investigated using the same sequencing methods together with catalyzed reporter deposition-fluorescence in situ hybridization (CARD-FISH). Gammaproteobacteria dominated all sequence libraries, followed by Epsilonproteobacteria. CARD-FISH confirmed the co-occurrence of these groups within R. piscesae trophosomes. Statistical analyses indicated distinctive membership and structure of trophosome assemblages between sampling sites. Analysis of R. piscesae juvenile showed distinctive structural properties when compared to adult individuals, but similar membership, within sampling sites. These results suggested that the composition of trophosome assemblages might be affected by specific physical and chemical conditions at each vent site and that a selection process might occur during R. piscesae’s development.
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Books on the topic "Tonga Arc"

1

St, Cartmail Keith. The art of Tonga =: Ko e ngaahi'aati'o Tonga. Honolulu: University of Hawaiʻi Press, 1997.

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Cartmail, Keith St. The art of Tonga =: Ko e ngaahi 'aati 'o Tonga. North Ryde, N.S.W: Craftsman House, 1997.

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Gregg, Tonya. Tonya Gregg: Exuberant boom. Ithaca, New York: Handwerker Gallery, Ithaca College, 2005.

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Gregg, Tonya. Tonya Gregg: Exuberant boom. Ithaca, New York: Handwerker Gallery, Ithaca College, 2005.

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Gutsa, Tapfuma. Tapfuma Gutsa's mulonga: Deep waters and starry skies : a celebration of Tonga culture and heritage. Zimbabwe?: Culture Fund?, 2012.

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Chong-mok, Yu, ed. Myŏngp'um 100-sŏn =: Dong-A University Museum hundred highlights. Pusan Kwangyŏksi: Tonga Taehakkyo Pangmulgwan, 2009.

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Kaeppler, Adrienne Lois. From the stone age to the space age in 200 years: Tongan art and society on the eve of the millenium. Nukuʻalofa, Tonga: Tongan National Museum, 1999.

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Pangmulgwan, Tonga Taehakkyo. Kukpo pomul: National treasure. Pusan Kwangyŏksi: Tonga Taehakkyo Pangmulgwan, 2010.

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1960-, Yang Xudong, ed. Shan shui qu tan. Beijing Shi: Zhonghua shu ju, 2010.

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Tong lu er xing you hua zhuan ji: Tongluerxing youhua zhuanji. Beijing Shi: Beijing gong yi mei shu chu ban she, 2004.

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Book chapters on the topic "Tonga Arc"

1

Karig, Daniel E. "Ridges and Basins of the Tonga-Kermadec Island Arc System." In Collected Reprint Series, 239–54. Washington, DC: American Geophysical Union, 2014. http://dx.doi.org/10.1002/9781118782149.ch12.

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Ewart, A., W. B. Bryan, B. W. Chappell, and R. L. Rudnick. "Regional Geochemistry of the Lau-Tonga Arc and Backarc Systems." In Proceedings of the Ocean Drilling Program, 135 Scientific Results. Ocean Drilling Program, 1994. http://dx.doi.org/10.2973/odp.proc.sr.135.141.1994.

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Sager, W. W., C. J. MacLeod, and N. Abrahamsen. "Paleomagnetic Constraints on Tonga Arc Tectonic Rotation from Sediments Drilled at Sites 840 and 841." In Proceedings of the Ocean Drilling Program, 135 Scientific Results. Ocean Drilling Program, 1994. http://dx.doi.org/10.2973/odp.proc.sr.135.119.1994.

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Haggerty, J. A., and J. B. Fisher. "Short-Chain Organic Acids in Interstitial Waters from the Tonga Arc-Trench System, Leg 135." In Proceedings of the Ocean Drilling Program, 135 Scientific Results. Ocean Drilling Program, 1994. http://dx.doi.org/10.2973/odp.proc.sr.135.126.1994.

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Tupou, Janet. "The Creative Voice." In Multidisciplinary Perspectives on Women, Voice, and Agency, 159–89. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4829-5.ch007.

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This chapter analyses themes of hybrid diasporic Tongan identity in the individual talanoa shared by Tongan women that was captured in doctoral research, per the author. Special focus is put on issues of “individual freedom” and “the collective burden” of expressing voice in the “walk in two worlds” creatively and geographically between Tonga and New Zealand. Although the legal and cultural frameworks in Tonga are progressive and relatively liberal with regard to the promotion of gender equality, some laws and traditions discriminate against women, establishing gender inequalities. As this chapter demonstrates, these inequalities have had profound impacts on women and their agency. Tongan women have spearheaded efforts to bridge communal boundaries and challenge the increasing normalisation of male dominance by continuously expressing their voices, particularly through creativity. The following perspectives inform this exploration, which is deconstructed from the standpoint of a TIWI (Tongan Kiwi) woman.

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Clift, P. D. "Controls on the Sedimentary and Subsidence History of an Active Plate Margin: An Example from the Tonga Arc (Southwest Pacific)." In Proceedings of the Ocean Drilling Program, 135 Scientific Results. Ocean Drilling Program, 1994. http://dx.doi.org/10.2973/odp.proc.sr.135.103.1994.

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Bruns, T. R., E. L. Geist, and D. L. Lavoie. "Synthetic Seismograms, Migrated Seismic Reflection Profiles, and Lithologic Correlations for Leg 135 Sites in the Lau Basin and Tonga Arc." In Proceedings of the Ocean Drilling Program, 135 Scientific Results. Ocean Drilling Program, 1994. http://dx.doi.org/10.2973/odp.proc.sr.135.156.1994.

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Clift, P. D., U. Bednarz, R. Bøe, R. G. Rothwell, R. A. Hodkinson, J. K. Ledbetter, C. E. Pratt, and S. Soakai. "Sedimentation on the Tonga Forearc Related to Arc Rifting, Subduction Erosion, and Ridge Collision: A Synthesis of Results from Sites 840 and 841." In Proceedings of the Ocean Drilling Program, 135 Scientific Results. Ocean Drilling Program, 1994. http://dx.doi.org/10.2973/odp.proc.sr.135.164.1994.

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"Hazlo, tonta." In El Arca de Noé, 225–28. ITESO, 2014. http://dx.doi.org/10.2307/j.ctvdmwz8c.55.

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"Thy Kingdom Come: The Democratisation of Aristocratic Tonga." In We Are the Ocean, 157–71. University of Hawaii Press, 2017. http://dx.doi.org/10.1515/9780824865542-014.

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Conference papers on the topic "Tonga Arc"

1

Verenski, Douglas R., Daniel H. Suchora, and Christoper W. Allen. "Experimental and Finite Element Analysis of Tong Load Slip Versus Clamping Force." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37712.

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Tong type mechanisms have been used in industry to lift many types of loads where the clamping force generated in the tong mechanism along with friction and indentation prevent the load from slipping out of the tongs. There are several types of tong designs, lifted load geometries and levels of hardness resulting in numerous variations of clamping forces and grip/load geometries which makes the design of the tong mechanisms extremely challenging. The purpose of this work is to develop a Finite Element Analysis (FEA) simulation of the grip behavior under the multitude of variables that occur in the practical use of tongs to lift loads. Variables include tong mechanism geometry and load size resulting in different tong grip angles relative to the lifted load and resulting clamping force. Other variables include the hardness of the lifted load and the style of grips. With an FEA simulation methodology developed, a multitude of different variables affecting tong effectiveness can be evaluated. To verify the FEA simulation, a series of actual laboratory tests were conducted. These tests measured the load slip force as a function of clamping force, grip geometry, and load and grip hardness. Also measured was the grip indentation into the load and deflection versus slip force. A comparison of the results of the FEA simulation and the experimental tests is given. In some cases the correlation is good and in others more work is needed. A plan for further improvement of the FEA simulation technique is given.

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Wang, Peng, Xiao Wu, Wenyue Lu, Xinliang Tian, and Xin Li. "A Field Monitoring System for Dynamic Positioning Floatover Installation." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77572.

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Floatover method has been proven a competitive installation technology in last thirty years. However, floatover installation is subject to a variety of technical challenges. Apart from weather restrictions, motions and position of the topside and deck transport vessel (DTV) should be strictly controlled during the entire installation operations. Therefore, a field monitoring system is essential to guarantee the installation safety. In this paper, a comprehensive introduction to the monitoring system developed by Shanghai Jiao Tong University is presented. The subsystems, including environment monitoring system, motions and position monitoring system, deck support units (DSUs) separating monitoring system, closed-circuit-television (CCTV) monitoring system as well as the integrated monitoring system (IMS), are proposed. Besides, the pre-installation surveys are also presented.

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Wang, Qi, Xiaopeng Wu, Haining Lu, Gang Chen, and Xiaoyuan Wu. "Numerical Calculation and Model Test Study on a Quay Mooring Semi-Submersible Drilling Platform." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20630.

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This paper introduces the study in both numerical calculation and model test of a Semi-submersible drilling platform moored along the quayside of Shanghai Waigaoqiao Shipbuilding Co. Ltd. (SWS). To obtain reliable quay mooring system for a SEMI in the out-fitting condition, complicated factors, such as a barge is applied between the SEMI and the quayside, quayside has practical limited conditions, nonlinear characteristics of mooring lines and fenders, etc., are firstly discussed. Then based on several simplifications, static analysis about different environmental conditions, normal and typhoon, are carried out, in order to design the preliminary layouts. Later on, model test with the scale of 1:50 is conducted in the basin of Shanghai Jiao Tong University (SJTU). Results between numerical simulation and model test are compared and the dynamic effect created by wave is investigated. Several principles for quay mooring layout of semi-submersible drilling platform have been concluded.

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Ma, Yu, Zhiqiang Hu, and Yan Qu. "Fundamental Analysis for the SWING Motion of Single Moored FPSO in South China Sea." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83237.

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FPSO moored by STP mooring system plays a dominate role in oil and gas production in South China Sea. To study its hydrodynamic characters, a joint industry project on full scale measurement for Fenjin FPSO, headed by Shanghai Jiao Tong University and sponsored by CNOOC, was initiated in October 2007 and lasted for 25 months. During the project, a special phenomenon, named as SWING, was noticed. When a SWING happened, the FPSO’s heading angle would change greatly within a relatively short period, beyond the normal range of the weather-vane effect. Due to the large low-frequency motion, the tension forces of mooring system would increase greatly. Also, it may lead to positioning failure during the tandem offloading operation. So, the SWING motion is a great threat to the safety of FPSOs. A preliminary prediction for its cause as well as a fundamental analysis of its hydrodynamic mechanism is completed in this paper. According to the statistical results of the SWING based on the Fenjin’s motion data during the full scale measurement as well as the corresponding wind wave and current data in the same period, a plausible prediction for its cause is provided. It is pointed out that the change of direction and velocity of the current within a short time might be the cause of SWING. The research for the mechanism of the SWING is carried out through both the methods of analytical analysis and the model test. A hydrodynamic model is built to simulate the low-frequency motions of FPSO in time domain. And an in-house MATLAB program is written on the basis of the hydrodynamic model, to do the calculation. Analysis results are compared with the full-scale measured data, to prove the cause prediction. Furthermore, on purpose of validating the program, a model test was conducted in Deepwater Offshore Basin in Shanghai Jiao Tong University. Several different current velocities were chosen in the test. The program results show a good agreement with both the data of full scale measurement and the model test results, which indicates that the hydrodynamic model and the code are both credible.

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Li, Yongchun, Weihua Zhou, Yanhua Yang, Bo Kuang, and Xu Cheng. "RELAP Simulation on Boiling and Flow Phenomena Under External Reactor Vessel Cooling Condition." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29867.

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External reactor vessel cooling (ERVC) of the In-vessel retention (IVR) system is widely accepted as a feasible way to remove decay heat from the lower head of the reactor pressure vessel (RPV) under severe accident (SA) conditions. However, some issues relating to ERVC still need to be evaluated before its application, such as boiling and flow phenomena and CHF prediction, etc. To study these key issues, an experimental study program named REPEC (Reactor Pressure Vessel External Cooling) is performed at Shanghai Jiao Tong University. Steady state experiments focusing on flow boiling phenomena investigation are carried out with comprehensive measurements, including temperature distribution, pressure drop and mass flow rate. As a part of studies on boiling mechanism and flow phenomena between RPV and the insulation, the experiment is analyzed and simulated with RELAP code. The code simulation covers most of the experimental cases, and a comparison between simulation results and experimental data are presented and discussed.

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Espinasse, Philippe. "Deepsea Pilot SMS Mining System for Harsh Environments." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20477.

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Following the trend of oil and gas production in deep waters, ore mining is about to start in the deep waters of the Pacific Ocean. If the first system will most probably be installed in the quiet though deep waters of Papua New Guinea, other prospects lie in the more turbulent areas of New Zealand and the Tongas. The ore accumulations to be mined are high grade hydrothermal mineral deposits rich in copper, gold, zinc, lead and silver located directly on the seabed. However, the excavation techniques need to be quite different from what had been envisaged for manganese nodules due to the morphology of the deposits. Based on its deep water construction experience, Genesis France, a company of the Technip Group has been contracted to perform a screening study of the various technologies to be applied to cut, crush, lift to the surface and pre-process the massive seabed sulphide deposits in a safe, efficient and profitable manner while minimizing the environmental impact of such work. This paper presents the conceptual screening study, the systems that have been evaluated, the selection criteria and the resulting operating system.

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Teodoriu, Catalin, Holger Kinzel, and Jerome J. Schubert. "Evaluation of Real-Time Torque-Turn Charts With Application to Intelligent Make-Up." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29518.

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A wide spectrum of power tongs can accommodate the increasing interest in mechanized operations at the rig floor. The importance of a torque-turn recording has been stated in many papers as a good control method for the make-up process, and the reliability of a drill string can be improved using feed back of make-up recordings. State-of-the-art devices not only allow the precise mechanized make-up of connections, but they also provide sufficient data to analyze the quality of the connection make-up. The motivation behind the research performed is the desire to make use of the data that are already provided to increases the lifetime of the connections and the reduction of drill string failures, especially for drilling under extreme downhole conditions like HPHT or deep water. This paper presents a new algorithm to evaluate the slope of the torque-turn recordings and to extract information that can be used to predict the quality of the process, with application to extreme drilling situations. This work is based on more than 300 make-up and break-out laboratory tests.

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Liu, Lin, Longfei Xiao, Zhiqiang Hu, and Lijun Yang. "Experimental Study on Wet Tow and Upending of a Truss Spar." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49310.

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In recent years, with the development of the deepwater oil and gas exploitation, the Spar platform has received more and more attention. A lot of research work has been done on the Spar platform, but experimental study on the process of wet tow and upending of Truss Spar is seldom conducted. Recently, a wet tow and upending model test of a Truss Spar was carried out in the State Key Laboratory of Ocean Engineering in Shanghai Jiao Tong University. The hydrodynamic characteristics and the global loads on the key points of the Truss Spar during the period of wet tow and upending are focused on. In the wet tow tests, the tow resistance, 6DOF motions, global loads and the relative wave elevations are measured and analyzed. During the upending simulation, the measuring parameters consist of the motions and the global moment at the connection points between the hard tank and the truss. The test program and test results are presented and discussed in this paper offering the value references for the wet tow and upending operation in reality of the Truss Spar.

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Zhang, Dongwei, Zhiqiang Hu, and Gang Chen. "Research on the Crashworthiness of FLNG Side Structures in the Side-by-Side Offloading Operation With LNGC." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41363.

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On purpose of evaluating the crashworthiness of FLNG side structures in case of the collision accident during the side-by-side offloading operation, a unique research is conducted in this paper with numerical simulation method. According to the model test completed in Deepwater Offshore Basin in Shanghai Jiao Tong University, there does exist a high probability of collision between FLNG and LNGC in the side-by-side offloading operation. To perform numerical simulations, finite element models were built. For the FLNG model, the side structures contain the detailed LNG cargo containment system. According to the parameters obtained from the model test, two typical collision scenarios are defined. Then the collision scenarios are simulated by the LS_DYNA code. A special limit collision state is proposed based on the structural response of LNG CCS. With respect to the numerical results, great attention is paid to the structural response of CCS to evaluate the safety of FLNG side structures. Furthermore, some insights useful for the basic design of FLNG are put forward.

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Liu, Geliang, Zhiqiang Hu, and Fei Duan. "Preliminary Analysis About Coupled Response of Offshore Floating Wind Turbine System in Time Domain." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41369.

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This paper presents a preliminary analysis of Offshore Floating Wind Turbine system subjected to coupled wind and wave loads in time domain. Floating Wind Turbine system in deep water has the great potential in exploiting renewable wind energy in the near future due to the energy and environmental issues. Distinct structural arrangements determine the complexity of motion behaviors and loading characteristics of OFWTs. The aerodynamic loads play a dominant part in the loading pattern, which is distinguished from traditional floating offshore oil and gas structures. To simulate the response induced by wind and wave, a calculation scheme is proposed containing the coupling between aerodynamics and hydrodynamics. Accordingly, a set of time-domain numerical codes is developed and presented. With the integrated aero and hydro dynamic analysis codes, simulations are conducted to obtain performance of Hywind system. Cases for decay, white noise, wind only and the coexistence of wind and wave are investigated. The results are compared to the test statistics collected from a model test, which was carried out in Deepwater Offshore Basin in Shanghai Jiao Tong University.

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Reports on the topic "Tonga Arc"

1

Dunn, Lewis, Andrey Baklitskiy, and Tong Zhao. Some Thoughts on the Logic of Strategic Arms Control: Three Perspectives. The United Nations Institute for Disarmament Research, January 2021. http://dx.doi.org/10.37559/wmd/21/ddac/01.

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Who are the proponents of strategic arms control? Why do they advocate it? What are their major assumptions? What are the important uncertainties of arms control? What is the relationship between strategic arms control and nuclear disarmament and nuclear deterrence? This paper, the fifth in UNIDIR’s nuclear dialogue series, explores these questions building on the perspectives of US, Chinese and Russian experts—Lewis A. Dunn, Andrey Baklitskiy and Tong Zhao—and drawing in the views of diverse and informed participants in UNIDIR’s Dialogue on Nuclear Disarmament, Deterrence and Strategic Arms Control.

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Dunn, Lewis, Andrey Baklitskiy, and Tong Zhao. Some Thoughts on the Logic of Strategic Arms Control: Three Perspectives. The United Nations Institute for Disarmament Research, January 2021. http://dx.doi.org/10.37559/wmd/21/ddac/01.

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Who are the proponents of strategic arms control? Why do they advocate it? What are their major assumptions? What are the important uncertainties of arms control? What is the relationship between strategic arms control and nuclear disarmament and nuclear deterrence? This paper, the fifth in UNIDIR’s nuclear dialogue series, explores these questions building on the perspectives of US, Chinese and Russian experts—Lewis A. Dunn, Andrey Baklitskiy and Tong Zhao—and drawing in the views of diverse and informed participants in UNIDIR’s Dialogue on Nuclear Disarmament, Deterrence and Strategic Arms Control.

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