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1
Reinhard, Robert G. "Analysis of Campylobacter jejuni, Campylobacter coli, Salmonella, Klebsiella pneumoniae, and Escherichia coli 0157:H7 in fresh hand picked blue crab (Callinectes sapidus) meat." Thesis, Virginia Tech, 1995. http://hdl.handle.net/10919/44250.
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Joseph, Siny. "Country of origin labeling a theoretical and empirical analysis of market effects in the U.S. seafood industry /." Amherst, Mass. : University of Massachusetts Amherst, 2009. http://scholarworks.umass.edu/dissertations/AAI3379974/.
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Al-Busaidi, Moza A. A. "Effective seafood safety and quality management systems : an analysis of the situation in the Sultanate of Oman." Thesis, University of Reading, 2017. http://centaur.reading.ac.uk/73263/.
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Globally there have been many challenges in establishing effective food safety control systems. Of particular interest to the Sultanate of Oman is the control of the safety and quality of seafood for its importance to the national economy, food security and trade. The research focused on the particular issue of food safety management systems (including the application of the Hazard Analysis Critical Control Point (HACCP)) system within the Omani seafood processors. To understand the whole context, a wider review was initially conducted which looked into the whole structure of food control in Oman including the legal documents and the administrative structures. The evidence indicates that there is no unified national food safety agency and that current laws and regulations are shared across various governmental authorities. By investigating the various challenges, weaknesses and strengths of the existing system it is noted that there are still deficiencies in comparison to international guidance. Subsequently the structure of the seafood supply chain was analysed and a survey was conducted to assess the issues pertinent to HACCP implementation in the seafood industry and the role of the regulatory authorities in governing the safety of seafood products. The survey identified more precisely the benefits and barriers of implementing the HACCP system for the HACCP processors and the non-HACCP processors, which are usually small industry. In conclusion, the research has shown the importance of adopting strategies to enhance safety and quality requirements from farm to fork covering all aspects of seafood harvesting, processing and distribution regardless of the target markets. A legal requirement to adopt HACCP systems and the application of related food safety management systems (FSMSs) and their pre-requisites programmes is recommended. It should be imposed on all seafood processors regardless of their markets to ensure conformity with national and international requirements.
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Farabegoli, Federica <1986>. "Analysis of Perfluoroalkyl Substances and Glycine Betaine: Contribution to the Assessment of Health Risks and Benefits of Seafood Consumption." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7573/.
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Seafood is known for its valuable and healthy nutrients; however scientific studies demonstrated the unavoidable presence of contaminants in fish and shellfish. Authorities strongly recommend fish consumption, especially to sensible groups of population (pregnant or nursing women, infants and children), and ask the scientific community for novel and coherent data to establish clear guidelines for consumers. There is also a serious need to extend the monitoring to emerging chemical pollutants, other than methylmercury, dioxins and polychlorinated biphenyls, to better understand the level of seafood contamination.
An innovative UHPLC-MS/MS method for the quantification of glycine betaine (GB) in Tapes philippinarum was developed and validated, taking the 2002/657 European Decision as guideline; GB is an endogenous osmolyte abundant in molluscs, and represent a vital methylating agent in humans.
Moreover, a previously developed and validated UHPLC-MS/MS method was used to conduct a preliminary monitoring of the presence of the two main perfluorinated contaminants, perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA), in six fish species from Italian markets (Dicentrarchus labrax, Merluccius merluccius, Mugil cephalus, Pleuronectes platessa, Scomber scombrus and Sparus aurata). The daily contribution of seafood to PFOS and PFOA dietary intake in Italian population was calculated and data were compared to the corresponding Tolerable Daily Intakes established by EFSA in 2008.
Results revealed that the risk of contamination related to fish consumption is unlikely, but suggested the need to conduct further surveys focused on certain species from different sampling site. Subsequently, a mono-specie monitoring was carried out in 140 farmed and wild subjects of Dicentrarchus labrax, from 14 different locations in the Mediterranean area. The obtained results showed that wild subjects are sensibly more contaminated than farmed ones, and that levels of fish contamination are strongly influenced by their geographical origin and the proximity to polluted areas.
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Grantz, David G. "Analysis of patterns of data use by teachers at Seaford Middle School." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 2.34Mb, 238 p, 2005. http://wwwlib.umi.com/dissertations/fullcit/3181866.
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Yuan, Jianxin. "Analysis of four-component seafloor seismic data for seismic anisotropy." Thesis, University of Edinburgh, 2001. http://hdl.handle.net/1842/11663.
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Interest in converted waves (C-waves) has been growing significantly in recent yeas due to the advent of four-component (4C) ocean-bottom-cable (OBC) seismic recordings. This has changed the way geophysicists obtain fluid and lithology information about hydrocarbon reservoirs through joint P- and converted-wave analysis. Since 4C OBC surveys use conventional air-gun sources, which generate P-waves only, the shear-waves recorded by the 4C sensors on the ocean bottom are mode-converted shear-waves. The main focus of this thesis is to find ways to process and understand these mode-converted shear-waves in the presence of seismic anisotropy which is common in marine sediments. To this end, I examine and model the data characteristics of 4C seismic data, review the basic theory of converted-wave processing, develop new kinematic theories for converted-waves propagating in anisotropic, inhomogeneous media, and apply these new methods to field 4C data. I focus on two types of anisotropy: transverse isotropy with either a vertical (TIV) or horizontal (TIH) axis of symmetry. As an emerging technology, the characteristics of 4C seismic data have not been fully understood, and there are many acquisition related problems yet to be solved. The characteristics of 4C seafloor data have been studied by field data analysis and by synthetic modelling. I have found: 1) the water-column reverberations in the vertical geophone are much weaker than those in the hydrophone, because of the different sensor responses to the source- and receiver-side multiples; 2) the presence of a low shear-wave velocity gradient in the seabed prohibits P-to-S conversion, and this implies that most shear-waves recorded in 4C data are converted at deep reflector; 3) due to current sensor design, there is a shear-wave energy leakage from the inline horizontal geophone to the vertical geophone, resulting in geophone coupling problem. I have also studied the problem of sensor orientation and presented geophone orientation algorithms for both gimballed and non-gimballed geophone systems.
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Beyer, Andreas. "Seafloor analysis bsed on multibeam bathymetry and backscatter data = Meeresbodenanalyse auf der Basis von Bathymetrie und akustischer Rückstreuung /." Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung, 2006. http://www.loc.gov/catdir/toc/fy0711/2007403021.html.
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Beyer, Andreas. "Seafloor analysis based on multibeam bathymetry and backscatter data = Meeresbodenanalyse auf der Basis von Bathymetrie und akustischer Rückstreuung /." Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung, 2006. http://www.loc.gov/catdir/toc/fy0711/2007403021.html.
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Batsi, Evangelia. "Micro-seismicity and deep seafloor processes in the Western Sea of Marmara : insights from the analysis of Ocean Bottom Seismometer and Hydrophone data." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0090/document.
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Depuis les séismes dévastateurs de 1999 d’Izmit et de Duzce, la partie immergée de la Faille Nord Anatolienne (FNA)en Mer de Marmara fait l’objet d’une intense surveillance. Malgré cela, la micro-sismicité demeure mal connue. Par ailleurs, alors que la connexion avec le système pétrolier du Bassin de Thrace est établie, le rôle du gaz sur la sismicité n’a pas été identifié.Dans ce travail, nous avons analysé des données d’OBS (Ocean Bottom Seismometers) acquises dans la partie ouest de la Mer de Marmara (en avril-juillet 2011 et septembre-novembre 2014), à partir de méthodes non-linéaires –NonLinLocet d’un modèle 3D de vitesses. Une grande partie de la sismicité se produit à des profondeurs inférieures à 6 km environ : le long de failles secondaires, héritées de l’histoire complexe de la FNA ; ou dans des couches de sédiments superficiels (< 1 km) riches en gaz. Cette sismicité superficielle semble être associée à des processus liés au gaz, déclenchés par les séismes profonds de magnitude M1 > 4.5 qui se produisent régulièrement le long de la MMF.Par ailleurs, 2 familles de signaux de courte durée (<1s), dits ≪ SDE ≫ (pour Short Duration Event) apparaissent sur les enregistrements : 1) les SDE se produisant à raison de quelques dizaines de SDE/jour, en réponse à des causes locales (i.e. bioturbation, activité biologique, micro-bullage de fond de mer, mouvements à l’interface eau/sédiment), etc ; 2) lesSDE se produisant par ≪paquets≫, dont certains sont enregistrés sur les 4 composantes (y compris l’hydrophone) et apparaissent de manière périodique, toutes les 1.8 s environ, en réponse à diverses causes qui restent à déterminer (parmi lesquelles : les mammifères marins ; l’activité humaine ; la sismicité ; le dégazage ; les ≪trémors≫ sismiques ; etc)Since the devastating earthquakes of 1999, east of Istanbul, the submerged section of the North Anatolian Fault (NAF), in the Sea of Marmara (SoM) has been intensively monitored, mainly using land stations. Still, the micro-seismicity remains poorly understood. In addition, although the connection of the SoM with the hydrocarbon gas system from the Thrace Basin is now well established, along with the presence of widespread gas within the sedimentary layers, the role of gas on seismicity is still not recognized.Here, we have analyzed Ocean Bottom Seismometer (OBS) data from two deployments (April-July 2011 and September-November 2014) in the western SoM. Based on a high-resolution, 3D-velocity model, and on non-linear methods (NonLinLoc), our location results show that a large part of the micro-seismicity occurs at shallow depths (< 6 a 8 km): along secondary faults, inherited from the complex history of the North-Anatolian shear zone; or within the uppermost (< 1 km), gas-rich, sediment layers. Part of this ultra-shallow seismicity is likely triggered by the deep earthquakes of intermediate magnitude (Ml > 4.5) that frequently occur along the western segments of the MMF.In addition, OBSs also record at least two families of short duration (<1 sec) events (SDEs): 1) “background SDEs” occurring on a permanent, at a rate of a few tens of SDEs/day, resulting from many possible, local causes, e. g.: degassing from the seafloor, biological activity near the seabed, bioturbation, etc; 2) “swarmed SDEs”, among which some are recorded also on the hydrophone, and characterized by a periodicity of ~ 1.8 seconds. The causes of these SDEs still remain to be determined (among which: anthropogenic causes, marine mammals, gas emissions, regional seismicity, tremors from the MMF, etc)
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Nait-Chabane, Ahmed. "Segmentation invariante en rasance des images sonar latéral par une approche neuronale compétitive." Phd thesis, Université de Bretagne occidentale - Brest, 2013. http://tel.archives-ouvertes.fr/tel-00968199.
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Un sonar latéral de cartographie enregistre les signaux qui ont été rétrodiffusés par le fond marin sur une large fauchée. Les signaux sont ainsi révélateurs de l'interaction entre l'onde acoustique émise et le fond de la mer pour une large plage de variation de l'angle de rasance. L'analyse des statistiques de ces signaux rétrodiffusés montre une dépendance à ces angles de rasance, ce qui pénalise fortement la segmentation des images en régions homogènes. Pour améliorer cette segmentation, l'approche classique consiste à corriger les artefacts dus à la formation de l'image sonar (géométrie d'acquisition, gains variables, etc.) en considérant un fond marin plat et en estimant des lois physiques (Lambert, Jackson, etc.) ou des modèles empiriques. L'approche choisie dans ce travail propose de diviser l'image sonar en bandes dans le sens de la portée ; la largeur de ces bandes étant suffisamment faible afin que l'analyse statistique de la rétrodiffusion puisse être considérée indépendante de l'angle de rasance. Deux types d'analyse de texture sont utilisés sur chaque bande de l'image. La première technique est basée sur l'estimation d'une matrice des cooccurrences et de différents attributs d'Haralick. Le deuxième type d'analyse est l'estimation d'attributs spectraux. La bande centrale localisée à la moitié de la portée du sonar est segmentée en premier par un réseau de neurones compétitifs basé sur l'algorithme SOFM (Self-Organizing Feature Maps) de Kohonen. Ensuite, la segmentation est réalisée successivement sur les bandes adjacentes, jusqu'aux limites basse et haute de la portée sonar. A partir des connaissances acquises sur la segmentation de cette première bande, le classifieur adapte sa segmentation aux bandes voisines. Cette nouvelle méthode de segmentation est évaluée sur des données réelles acquises par le sonar latéral Klein 5000. Les performances de segmentation de l'algorithme proposé sont comparées avec celles obtenues par des techniques classiques.
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Picard, Laurent. "Prise en compte de l'environnement marin dans le processus de reconnaissance automatique de cibles sous-marines." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0038/document.
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Au cours des dernières décennies, les avancées en termes de technologies robotiques sous-marines ont permis de réaliser des levés sur les fonds marins à l'aide de véhicules sous-marins autonomes (AUV). Ainsi, équiper un AUV avec un sonar latéral permet de scanner une vaste zone de manière rapide. Naturellement, les forces armées se sont intéressées à de tels dispositifs pour effectuer des missions de chasses aux mines rapides et sécurisées pour le facteur humain. Néanmoins, analyser des images sonar par un ordinateur plutôt que par un opérateur reste très complexe. En effet, les chaînes de reconnaissance automatique de cibles (ATR) doivent faire face à la variabilité de l'environnement marin et il a été démontré qu'une forte relation existe entre la texture d'une image et la difficulté d'y détecter des mines. Effectivement, sur des fonds fortement texturés, voire encombrés, les performances d'une chaîne ATR peuvent être très dégradées. Ainsi, intégrer des informations environnementales dans le processus apparaît comme une piste crédible pour améliorer ses performances. Ces travaux de thèse proposent d'étudier la manière de décrire cet environnement marin et comment l'intégrer dans un processus ATR. Pour répondre à ces défis, nous proposons tout d'abord une nouvelle représentation des images sonar basée sur l'utilisation du signal monogène. Ce dernier permet d'extraire des informations énergétiques, géométriques et structurelles sur la texture locale d'une image. La nature multi-échelle de cet outil permet de tenir compte de la variabilité en taille des structures sous-marines. Ensuite, le concept de dimension intrinsèque est introduit pour décrire une image sonar en termes d'homogénéité, d'anisotropie et de complexité. Ces trois descripteurs sont directement reliés à la difficulté de détection des mines sous-marines dans un fond texturé et permettent de réaliser une classification très précise des images sonar en fonds homogènes, anisotropes et complexes. De notre point de vue, la chasse aux mines sous-marines ne peut pas être réalisée de la même manière sur ces trois types de fond. En effet, leurs natures et caractéristiques propres mènent à des challenges variés pour le processus ATR. Pour le démontrer, nous proposons de réaliser un premier algorithme de détection spécifique, appliqué aux zones anisotropes, qui prend en considération les caractéristiques environnementales de ces régionsIn the last decades, advances in marine robot technology allowed to perform accurate seafloor surveys by means of autonomous underwater vehicles (AUVs). Thanks to a sidescan sonar carried by an AUV, a wide area can be scanned quickly. Navies are really interested in using such vehicles for underwater mine countermeasures (MCM) purposes, in order to perform mine hunting missions rapidly and safely for human operators. Nevertheless, on-board intelligence, which intends to replace human operator for sonar image analysis, remains challenging. Current automatic target recognition (ATR) processes have to cope with the variability of the seafloor. Indeed, there is a strong relationship between the seafloor appearance on sidescan sonar images and the underwater target detection rates. Thus, embed some environmental information in the ATR process seems to be a way for achieving more effective automatic target recognition. In this thesis, we address the problem of improving the ATR process by taking into account the local environment. To this end, a new representation of sonar images is considered by use of the theory of monogenic signal. It provides a pixelwise energetic, geometric and structural information into a multi-scale framework. Then a seafloor characterization is carried out by estimating the intrinsic dimensionality of the underwater structures so as to describe sonar images in terms of homogeneity, anisotropy and complexity. These three features are directly linked to the difficulty of detecting underwater mines and enable an accurate classification of sonar images into benign, rippled or complex areas. From our point of view, underwater mine hunting cannot be performed in the same way on these three seafloor types with various challenges from an ATR point of view. To proceed with this idea, we propose to design a first specific detection algorithm for sand rippled areas. This algorithm takes into consideration an environmental description of ripples which allow to outperform classic approaches in this type of seafloor
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Hatzky, Jörn [Verfasser]. "Analyse von Bathymetrie und akustischer Rückstreuung verschiedener Fächersonar- und Sedimentecholot-Systeme zur Charakterisierung und Klassifizierung des Meeresbodens am Gakkel-Rücken, Arktischer Ozean = Analysis of bathymetry and acoustic backscatter from different multibeam sonar and sediment echosounder systems for the characterisation and classification of the seafloor at the Gakkel ridge, Arctic ocean / Jörn Hatzky." Bremerhaven : AWI, Alfred-Wegener-Institut für Polar- und Meeresforschung, 2009. http://d-nb.info/1010171321/34.
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Yeh, Chung-Han, and 葉聰翰. "Analysis and Risk Assessment of Organotin Compounds in Seafood." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/86763520167978589766.
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碩士國立中山大學
海洋資源學系研究所
90
Abstract This study concerns contents of several organotin compounds, monobutyltin (MBT), dibutyltin (DBT), tributyltin (TBT), monophenyltin (MPhT), diphenyltin (DPhT) and triphenyltin (TPhT), in seafood. Seafood samples were collected from markets and coastal zone in Taiwan, and contents of organotins were analyzed by Grignard reagent derivation coupled with GC/FPD. Besides, the tolerable daily intake (TDI) of (TBT+DBT), mean body weight of Taiwan citizen and the consumption of seafood were used to derive the tolerable average residue level (TARL) of the compounds. The risk assessment was implemented by comparing the content to TARL. The contents of TBT, DBT, MBT, TPhT, DPhT and MPhT in seafood ranged N. D~48.36 ng Sn/g wet wt., N. D~36.68 ng Sn/g wet wt., N. D~79.19 ng Sn/g wet wt., N. D~225.53 ng Sn/g wet wt., N. D~128.16 ng Sn/g wet wt., N. D ~ 95.44 ng Sn/g wet wt., respectively. Reference survey showed that mean body weight of Taiwan citizen is 54.42 Kg, and seafood consumption rate is 127.59 g/day/person. A TARL of 44.27 ng Sn/g wet wt. is derived accordingly. Of all the 71 samples, only 4 contain more (TBT+DBT) than the TARL. On the other hand, (TBT+DBT) contents weighed by consumed ratio averaged 3.87 ng Sn/g wet wt., which is far under the TARL. Different visions lead to the same conclusion that (TBT+DBT) content of seafood in Taiwan is far away from dangerous level. This study also concluded that cooking process doesn’t affect the contents of organotin compounds of seafood, and the Grignard reagents contribute to the TBT blank signal. Furthermore, the independence between organotins and factors such as classifications, sampling area or habitat was discussed.
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Chen, Yi-An, and 陳奕安. "The Analysis of Taiwanese Seafood Products with Export Potential." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/84103349078448300959.
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碩士國立臺灣大學
農業經濟學研究所
103
When dealing with export promotion, the concerning authority anticipates that the limited resources which can foster the development of the exporting products could be exploited without careful screening. The seafood industry is not an exception. How to select Taiwanese seafood products with export potentials from numerous items of seafood is the primary researching question of this thesis. By means of the concept of composite indicators, this study constructs a mechanism using the Multiplicative Optimization Approach which can integrate the various information of measuring export potentials into a single indicator. Due to the plentiful items of seafood products, this study selected the top ten items as the targets according to their ranking in average gross export values during 2011 to 2013 and the completeness of their tariffs information. They are Bigeye tuna, Yellowfin tuna, frozen bonito, live Grouper, frozen Bigeye tuna, live Eels, frozen Albacore or Longfinned tunas, frozen Yellowfin tunas, frozen Tilapia, frozen Saury in order. If the ten items of seafood products are divided into three categories, which are high, medium, and low export potential, the high export potential category includes Bigeye tuna(fresh or chilled), Yellowfin tuna(fresh or chilled), and frozen bonito. All of these three seafood are produced through the method of pelagic fishing, and their exporting destination are Indonesia, Philippines, Peru, Fiji, Thailand, and China. Accordingly, the authority should concentrate on protecting the marine resources of the pelagic fishing from excessive exploitation. In the long run, how to transform the pelagic fishing industry into tuna aquaculture is also an important strategy to cope with the stock depletion problem.
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Lin, Hsin-Chung, and 林欣君. "The Analysis of Consumers' Preference on Ecolabeled Seafood in Taiwan." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/c73876.
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碩士國立臺灣海洋大學
應用經濟研究所
105
According to the statistics of United Nations, 77% of the marine fishery resources have been over-exploited around the world. Due to the fact that people do not have the concept of sustainable development in the past, the abundant natural resources of ocean is damaged as time goes on. Therefore, Food and Agriculture Organization of the United Nations (FAO) concluded Code of Conduct for Responsible Fisheries (CCRF) in 1995, which promoted Ecolabel and spread it in the international. Considering arising awareness of global environmental protection, seafood safety verification and Ecolabeled are considerable emphasis on international business. But are the consumers in Taiwan pay attention to this situation? Before consuming seafood, what are the factors influencing consumers’ behavior? Should we also promote the Ecolabeled system in Taiwan? In this study, seafood products are divided into several attributes: Production Methods, Origin, Ecolabeled and Prices. By using attributes combined into different products, so that consumers have different combinations of products to choose. This thesis will use conjoint analysis and questionnaire survey to find out different types of consumers making choice on different products, and logit model is conducted as part-worth estimation. Finally propose a marketing strategy to firms and government. The survey results reveal that consumers receive messages mostly from the Internet, and most consuming in the traditional market. No preference state of preservation products and harvesting methods. The most important factor is "freshness" and the least important factors are "for wild fishing" and "for local harvest" in consumer seafood products. Additional segmentation of consumers find that specific groups of consumers affected by their own group of great impact on the consumption of seafood products preferences and other consumers are different conditions. The result denotes that according to Logit model, the most important attribute of Grouper is “Production Methods”, and the most unimportant is “Price”. It does demonstrate that consumers consume the Grouper, most of them more care about “Production Methods”. Products of Shrimp and Teuthida, the most important attribute is “Ecolabeled”. Indicating that consumers consume two products, most of them more cares about “Ecolabeled”. However, continue to Ecolabeled divide into local, international and non-Ecolabeled, the results were not as expected. Perhaps Taiwanese do not care about or understand Ecolabeled. If we want to create Ecolabeled system, we have to concern about this.
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Huang, Zi-Xhi, and 黃資智. "Analysis of Competitiveness and Key Success Factors of Taiwan Seafood Industry." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/29643218936510168862.
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碩士國立臺灣海洋大學
海洋資源管理研究所
94
After formally joined the WTO in 2002, the seafood processing industry and trade faces severe challenges. Government actively promote the hazard analysis and critical control point (HACCP ) management system which is focusing on the raw material identification, processing, manufacturing, storage and distribution of seafood products. In order to realize whether the HACCP management system can effectively improve the competitiveness of the seafood processing industry in Taiwan, this study conducted surveys by mail and in-depth interview. In addition, this study also applies SWOT and Diamond Model Analysis to examine the competitiveness of seafood processing industry. The sample includes 25 Health Bureaus and 150 seafood processing companies. This study argues that there is no significant evidences that the competitiveness of seafood processing industry has improved after joined the WTO and implemented the HACCP system. Due to the differences of individual business conditions and invested costs, the efficiency of corporations that applied HACCP management system is also different. Under the international regulation and the international competition, the seafood processing industry needs more assistance and support from the government to upgrade competition and develop permanently. Last but not least, the suggestions and problems proposed by the seafood processing industry, inclusive of financial assistances, overseas expansion, Ordnance Bench Mark (OBM) and adopting the system of certification, are key factors that are worth of the from the government’s concern and support.
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CHEN, YI-CHING, and 陳怡靜. "The Analysis of Yungan Tourism Seafood Market in Taoyuan – An IPA Approach." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/82603520781769134429.
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碩士開南大學
觀光運輸學院碩士在職專班
104
Nowadays, tourism is a reward to a lot of people’s hard work and the quality of living is constantly improving. The main feature of Yungan Tourism Seafood Market is Hakka culture, which is unique in Taiwan. It has been become a new tourist attraction in northern Taiwan. So far the data on studying of Yungan Tourism Seafood Market are not a lot. And as a local resident here, I hope my research will be beneficial to my hometown. The research method is thus an Importance-Satisfaction Analysis for Yungan Tourism Seafood Market. The first part of the survey is to conduct a descriptive statistical analysis to understand the main features of tourists. The result came out that tourists here are mostly people from northern Taiwan, 20 to 40 of age, and with average monthly income of 20,000 to 40,000. Most tourists are with family here. In part two of Importance-Performance Analysis shows that, "enough parking spaces" and "attitudes of waiters in the market " are very important. Tourists are satisfied with these and need to maintain them. "Are there rest areas for tourists ", "Design of the market are with special features.", "the bulletin boards," and "Is the shopping area spacious?" neither the satisfaction nor the importance score high. It means they are minor factors for improvement. "Health and Hygiene" and "Safety and Warning Signs," and " The prices" are particularly important but the satisfaction is not good. They are thus a priority for improving. Overall, the importance of the total average of 4.51 for the questions of this analysis, is of very high importance, and the satisfaction with the total average 3.35 in comparison with the importance is still relatively low. Keywords：Yungan Tourism Seafood Market, Importance-Performance Analysis, Descriptive Statistical Analysis
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HOC, TRAN THAI, and 陳泰學. "Application of data envelopment analysis to measure efficiency on seafood export industry in Vietnam." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/11993653960958636912.
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碩士國立高雄應用科技大學
製造與管理外國學生碩士專班
102
To evaluate the performance efficiency of seafood export companies in Vietnam, this present study applied DEA methodology as a foundation theory are employed to measure the efficiency under several different input and output variables. Furthermore, this study also focuses on the impact of the scale to the efficiency of decision making units. The empirical results of total 19 companies with the realistic data in six consecutive years (2007-2012) of the seafood export industry in Vietnam show that under two perspesctive approach (Constant return to scale and Variable return to scale), the number of inefficiency companies accounted for more than 80 percent, just only nearly 20% have a good performance during 2007 to 2012. This study also indicated that the impact of scale to operational efficiency of companies.
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Yao-Hui, Wang, and 王堯慧. "The market analysis of attitude, acceptance and willingness to pay toward Keelung seafood safety certification." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/47hjm8.
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碩士國立臺灣海洋大學
應用經濟研究所
106
In order to effectively promote local seafood products, the Keelung government drew up plans in 2016 to establish a certifying emblem, "Keelung seafood safety certification” that would fall under the authentication system of fresh and processed fishery products for the city of Keelung. The new emblem would increase consumers’ ability to differentiate and make informed selection at time of purchase. Through market survey and economic analysis, this study aims to analyze the market perceptions, the market’s level of acceptance and consumers’ willingness to pay for the "Keelung seafood safety certification" label. A total of 73 firms and 832 consumers responded to a questionnaire. The results showed that about 40% of the firms have heard of the labels, but only 10% of the respondents sold products with the label. About 65% of respondents consider the certification as important and agree that it can represent the local specialty fishery products in Keelung. The consumer results show that about 70% of the consumers have not prioritized it. However, more than 80% of the consumers believe that the "Keelung seafood safety certification" label is important and agree that it can represent Keelung particular fishery products. On average, consumers’ displayed a willingness to pay about a 42.6 price purchase for squid that bore the "Keelung seafood safety certification" label. According to Heckman’s Two-Step Sample Selection Method, the “Probit Model” shows if consumer unmarried, have higher educational degree, live in high-income family, agree Certification label that it can represent Keelung special fishery products, they will pay more price to buy the product has "Keelung seafood safety certification" label. Using the "Tobit Model", divided into five parts. First "marriage status" is show "Non Significates". The consumer married "willingness to pay (WTP)" is lower than unmarried. Second is "educational degree" show “Significates". The level of education was tested and it emerged that, statistically, higher levels of education led to a higher willingness to buy food marked with the Keelung seafood safety certification label. Third is "Income level", show to "Significates". The consumer live in high-income family WTP is higher than general income family. Forth is "purchase seafood frequency" is show "Significates". The consumer usually purchase seafood frequency WTP is higher than seldom purchase seafood frequency. The last is "Consumer understand Certification label and agree that it can represent Keelung particular fishery products". The consumer understand label WTP is higher than consumer not understand.
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Hung-Ming, Chen, and 陳宏銘. "An Analysis of U.S.A. Seafood Market Wholesale Prices -- An Application of the Vector ARMA Model." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/69628220356499003158.
Full textAbstract:
碩士國立海洋大學
應用經濟研究所
91
After Taiwan joined the World Trade Organization in January 2002, a significant tariff reduction had lowered the import cost of the fishery products and had increased the import demand significantly. Salmon, cod, shrimp and lobster are top four major import seafood groups in Taiwan and their demand will be more sensitive to the international seafood prices after trade liberalization. In this study, we try to collect the international seafood prices in order to measure the competitiveness of the domestic seafood supply in Taiwan. Since U.S.A. is the second largest import source country to Taiwan and it is also the second largest seafood importing country in the world, it is interesting to find that salmon, cod, shrimp and lobster are also the four major seafood imports in U.S.A. Even though Japan is the largest importing country of fishery products in the world, its import value has declined by 4.02% annually since 1995 to 2001. During the same period of time, the import value of seafood in U.S.A. has increased by approximately 6.42% annually and accounts for 17.24% of the total value of seafood imports in the world in 2001. Therefore, the seafood import market in U.S.A. will be an ideal market to provide us the information of international price of salmon, cod, shrimp and lobster in the world. This study collects the weekly wholesale prices of 15 product items of salmon, cod, shrimp and lobster started from the first week of January 1994 to the fourth week of December 2002 from Urner Barry Publications, Inc. For each of the four major imported product groups, the average F.O.B. prices before tariff in Taiwan are all lower than the average wholesale prices in U.S.A. during the above period. It is possible that the importers in Taiwan tend to import low-price and low-quality seafood or they may tend to under estimate their import value to avoid paying tariff to the government. Furthermore, this study used the non-nested causality test to investigate the lead-lag relationship between various wholesale price variables. The vector ARMA model is used to estimate the relationship for each of the four groups of fishery products in U.S.A. Results show that the wholesale prices are all correlated in one or two weeks lag, which suggest that the seafood price in the following week may be tracked by the price information in the past two weeks. The major findings in this study are as follows, (1) the import price of Chilean fresh fillets salmon (SACA) is a leading price index to two other salmon products; (2) the price of U.S.A. domestic dressed frozen halibut (CHDT) is a price leading index to three other cod products; (3) Among four imported sources of the shrimp products, the prices of Central and South American shrimp (SHCS), U.S.A. domestic brown shrimp (SHGB), and U.S.A. domestic white shrimp (SHGW) exhibit feedback relationships among each other; (4) Among all three kinds of imported lobster products, the prices of West Australian lobster tails (LOTA), Brazil lobster tails (LOTB) and Caribbean lobster tails (LOTC) exhibit feedback relationships with each other. The RMSPE of the in-sample price forecasts of cod, shrimp and lobster are all smaller than 3%, which indicates that the VARMA model performed very well in forecasting. This study recommends the government to establish a price-monitoring system to ensure the competitiveness of the domestic fishery products in Taiwan and to avoid a loss of the tariff revenue. Results of this study could provide a way to master the trend of international wholesale seafood prices and to provide the government a double-checking basis of the seafood import prices in Taiwan.
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chiu, kuo shu, and 邱國書. "A Study of Management Performance for Taiwan Tourist Seafood Markets– An Application of Data Envelopment Analysis." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/46393019703247079550.
Full textAbstract:
碩士國立臺灣海洋大學
應用經濟研究所
93
Abstract The traditional business income of fishermen’s association were generally declined in past few years. And the tourist seafood market operated by the association was generally served as the potential business for the fishermen’s associations . Therefore, there are many fishermen’s association want to run tourist seafood markets. We can find from the opening tourist seafood markets around Taiwan that those markets can actually create huge commercial profits . Even so, there are still lots of tourist seafood markets closeing out due to the inappropriate operations. Therefore, it is important to know how the opening tourist seafood markets operate now. DEA (Data envelopment analysis) is adopted in this research to analyze the operational performance in the targets of tourist seafood markets and discuss the difference of different style tourist seafood markets’ efficiency. CCR and BCC model are adopted to carry out efficiency analysis of the data of six tousist seafood markets from 1999 to 2003. With the use of Data Envelopment Analysis, the efficiency is gradually decreasing from 1999 to 2003. Through efficiency analysis, we know inefficiency is due to improper operation of return to scale (scale inefficiency) or improper use of resources (pure technique inefficiency）. Then, slack variable analysis is adopted to improve the input and output resources. At last, following suggestion is brought up according to the study result, which can be applied with Data Envelopment Analysis to evaluate the management efficiency of tourist seafood markets. Future study in similar subject should include other variables to explore more issues related to the efficiency of tourist seafood markets. Keywords: Data Envelopment Analysis, Tourist Seafood Market, Performane Assessment.
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Ngoc, Nguyen Van, and Nguyen Van Ngoc. "A Dynamic Analysis on the Influencing Factors of Vietnam’s Garment and Textiles, Seafood and Wooden Furniture Products Exported to Japan." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/76343885441516325182.
Full textAbstract:
碩士大葉大學
會計資訊學系碩士班
101
ABSTRACT This paper employs quarterly data from quarter one, 1998 to quarter two, 2012 to determine the impact of macroeconomic variables and others on Vietnam’s Garment and Textiles products, Vietnam’s Seafood products, Vietnam’s Wooden Furniture products exported to Japan. We have performed VAR model tests, Cointegration test, Granger causality test analysis the relationship on Vietnam’s Garment and Textiles products, Vietnam’s Seafood products, Vietnam’s Wooden Furniture products exported to Japan, and macroeconomic variables and others. The VAR results show that Garments and Textiles is negatively affected by Crude oil price and positively affected Cost of Labor. However, Garments and Textiles is not affected by Real GDP, Real Effective Exchange Rate in the short-run. Real GDP can effect to Seafood, which is positively. Real Effective Exchange Rate influenced Seafood. Seafood is affected by Cost of Labor. Seafood is influenced by Price of Seafood which is positively. Real GDP do not effect on Vietnam’s Wooden furniture exported to Japan market. Vietnam’s Wooden furniture exported to Japan market is significantly and negatively affected by price of wooden furniture. The results from Cointegration tests indicate that Real GDP, Real Effective Exchange Rate and Crude oil price has a positive significantly effect on export Vietnam’s Garments and Textiles in long-run, while Cost of labor has a negative significantly effect on export Vietnam’s Garments and Textiles. Real Effective Exchange Rate, cost of labor has a positive significant effect on export Vietnam’s Seafood products in long-run, while Real GDP and Price of Seafood has a negative significantly effect on export Vietnam’s Seafood products in long-run. Real GDP and Price of Wooden furniture has a negative and statistically significant effect on export Vietnam’s Wooden furniture in long-run. Finally, there is unidirectional Granger causality running from real GDP in Japan and Real Effective Exchange Rate to Vietnam’s Garments and Textiles. There is no granger causality between Vietnam’s Garments and Textiles, and real GDP in Japan, Real Effective Exchange Rate, Crude oil price and Cost of Labor in long-run. There is unidirectional Granger causality running from Real Effective Exchange Rate and Price of Seafood to Vietnam’s Seafood. There is also long-run Granger causality relationship running from real GDP in Japan, Real Effective Exchange Rate, Cost of Labor and Price of Seafood to Vietnam’s Seafood products at 1 per cent level in Japan market. There is no existence for granger causality from real GDP and price of wooden furniture to Vietnam’s Wooden furniture exported to market Japan in long-run. But, in short-run, there is bidirectional Ganger causality between Price of wooden furniture and Vietnam’s Wooden furniture. Key words: Vector Auto-regression (VAR) model, VECM, Garments and Textiles, Seafood export, Wooden furniture.
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"Bromophenols in Hong Kong dried seafood, their quantities and other volatile compounds in the cultured giant grouper (Epinephelus lanceolatus)." 2012. http://library.cuhk.edu.hk/record=b5894899.
Full textAbstract:
Lam, Hon Yiu."November 2011."
Thesis (M.Phil.)--Chinese University of Hong Kong, 2012.
Includes bibliographical references (leaves 122-135).
Abstracts in English and Chinese.
Abstract (in English) --- p.i
Abstract (in Chinese) --- p.iv
Acknowledgement --- p.vi
Contents --- p.vii
List of Abbreviations --- p.xiii
List of Figures --- p.xiv
List of Tables --- p.xvii
Chapter 1 --- Literature review
Chapter 1.1 --- Introduction --- p.1
Chapter 1.2 --- Flavor of fish --- p.3
Chapter 1.2.1 --- Carbonyls (aldehydes and ketones) and alcohols --- p.4
Chapter 1.2.2 --- Sulfur-containing compounds --- p.5
Chapter 1.2.3 --- Thermally-induced flavor --- p.5
Chapter 1.2.4 --- Deteriorated fish flavor --- p.6
Chapter 1.2.5 --- Autoxidation --- p.7
Chapter 1.2.6 --- Bromophenols --- p.8
Chapter 1.3 --- Bromophenols in aquaculture --- p.8
Chapter 1.3.1 --- General properties of bromophenols --- p.9
Chapter 1.3.2 --- Biosynthetic pathway of bromophenol in marine algae --- p.12
Chapter 1.3.3 --- Thresholds of bromophenols --- p.14
Chapter 1.3.4 --- Toxicity of bromophenols --- p.17
Chapter 1.4 --- Giant Grouper --- p.19
Chapter 1.4.1 --- Living Habitat of Giant Grouper --- p.19
Chapter 1.4.2 --- Biological features of Giant Grouper --- p.23
Chapter 1.4.3 --- Aquaculture of Giant Grouper --- p.23
Chapter 1.5 --- Flavor analysis and extraction methods --- p.23
Chapter 1.5.1 --- Solvent extraction --- p.25
Chapter 1.5.2 --- Simultaneous Steam Distillation/Extraction --- p.25
Chapter 1.5.3 --- Headspace sampling --- p.27
Chapter 1.5.4 --- Gas Chromatography/Olfactometry (GCO) --- p.28
Chapter 1.5.5 --- Food chemistry and Odor Threshold Value --- p.30
Chapter 2 --- Distribution of bromophenols in selected Hong Kong dried seafood
Chapter 2.1 --- Introduction --- p.33
Chapter 2.2 --- Materials and Methods --- p.34
Chapter 2.2.1 --- Sample preparation --- p.34
Chapter 2.2.2 --- "Preparation of the internal standard, Pentachloroanisole" --- p.35
Chapter 2.2.3 --- Simultaneous steam distillation-solvent extraction (SDE) --- p.35
Chapter 2.2.4 --- Gas chromatography-mass spectrometry (GC-MS) --- p.36
Chapter 2.2.5 --- Compound identification --- p.37
Chapter 2.2.6 --- Quantification of compounds --- p.37
Chapter 2.2.7 --- Recovery --- p.37
Chapter 2.2.8 --- Odor activity value (OAV) --- p.38
Chapter 2.2.9 --- Statistical Analysis --- p.38
Chapter 2.3 --- Results and discussion --- p.39
Chapter 2.3.1 --- Distribution of bromophenols in dried seafoods --- p.39
Chapter 2.3.2 --- Bromophenol contents in dried seaweeds --- p.51
Chapter 2.3.3 --- Bromophenol contents in dried crustacean --- p.52
Chapter 2.3.4 --- Bromophenol contents in dried mollusks --- p.53
Chapter 2.3.5 --- Bromophenol contents in dried-salted fishes --- p.54
Chapter 2.3.6 --- Relationship between living habitat and bromophenol contents --- p.55
Chapter 2.3.7 --- Flavor impact of bromophenols in dried seafood --- p.57
Chapter 2.3.8 --- Comparison of bromophenol content in purchased dried laminaria with Qingdao seaweed powder and bloodworms --- p.64
Chapter 2.4 --- Conclusion --- p.67
Chapter 3 --- Bromophenol content retention and fish quality in giant grouper
Chapter 3.1 --- Introduction --- p.70
Chapter 3.2 --- Materials and Methods --- p.71
Chapter 3.2.1 --- Abbreviation of treatment groups --- p.71
Chapter 3.2.2 --- Sample preparation --- p.72
Chapter 3.2.3 --- Ingredients --- p.72
Chapter 3.2.4 --- Production of fish feed --- p.73
Chapter 3.2.5 --- Preparation of the internal standard，Pentachloroanisole --- p.73
Chapter 3.2.6 --- Simultaneous steam distillation-solvent extraction (SDE) --- p.75
Chapter 3.2.7 --- Gas chromatography-mass spectrometry (GC-MS) --- p.75
Chapter 3.2.8 --- Bromophenol identification and quantification --- p.76
Chapter 3.2.9 --- Recovery of bromophenols --- p.76
Chapter 3.2.10 --- Muscle color determination --- p.76
Chapter 3.2.11 --- Texture analysis --- p.77
Chapter 3.2.12 --- Moisture determination --- p.78
Chapter 3.2.13 --- Ash determination --- p.78
Chapter 3.2.14 --- Fat determination --- p.78
Chapter 3.2.15 --- Protein determination --- p.79
Chapter 3.2.16 --- Statistical Analysis --- p.80
Chapter 3.3 --- Results and discussion --- p.80
Chapter 3.3.1 --- Muscle color of giant grouper --- p.81
Chapter 3.3.2 --- Texture of giant grouper --- p.85
Chapter 3.3.3 --- Proximate analysis of giant grouper --- p.86
Chapter 3.3.4 --- Bromophenol depuration of giant grouper --- p.92
Chapter 3.4 --- Conclusion --- p.101
Chapter 4 --- Volatile compounds in giant grouper
Chapter 4.1 --- Introduction --- p.102
Chapter 4.2 --- Materials and Methods --- p.103
Chapter 4.2.1 --- Sample preparation --- p.103
Chapter 4.2.2 --- "Preparation of the internal standard, 2,4,6Trimethylpyridine (TMP)" --- p.104
Chapter 4.2.3 --- Dynamic headspace (purge-and-trap) --- p.104
Chapter 4.2.4 --- Simultaneous steam distillation-solvent extraction (SDE) --- p.105
Chapter 4.2.5 --- Gas chromatography-mass spectrometry (GC-MS) --- p.105
Chapter 4.2.6 --- Compound identification --- p.106
Chapter 4.2.7 --- Quantification of compounds --- p.106
Chapter 4.2.8 --- Recovery --- p.107
Chapter 4.2.9 --- Odor activity value (OAV) --- p.108
Chapter 4.2.10 --- Statistical analysis --- p.108
Chapter 4.3 --- Results and discussion --- p.108
Chapter 4.3.1 --- Comparison of extraction between dynamic headspace and SDE --- p.108
Chapter 4.3.2 --- Flavor profile of giant grouper --- p.113
Chapter 4.3.2.1 --- carbonyls and alcohol --- p.113
Chapter 4.3.2.2 --- Other aroma volatile compounds in giant grouper --- p.116
Chapter 4.3.3 --- Giant grouper tainted by water contamination --- p.116
Chapter 4.4 --- Conclusion --- p.118
Chapter 5 --- General conclusion --- p.119
References --- p.122
Appendix --- p.136
24
Oliveira, Cátia Adriana Almeida. "Development and Validation of LC-MS/MS Method for Quantitative Analysis of Bisphenol A and Tetrabromobisphenol a in Seafood and Seaweed." Dissertação, 2015. https://repositorio-aberto.up.pt/handle/10216/80837.
Full text
25
Oliveira, Cátia Adriana Almeida. "Development and Validation of LC-MS/MS Method for Quantitative Analysis of Bisphenol A and Tetrabromobisphenol a in Seafood and Seaweed." Master's thesis, 2015. https://repositorio-aberto.up.pt/handle/10216/80837.
Full text
26
Shih, Steven Ping-Nan, and 施炳楠. "A Study on the Performance of Fresh Seafood Marketing of the Supermarket-An Empirical Case Analysis of the Chain-Stores in Taipei." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/77153097683466652135.
Full text
27
Pokorná, Nikola. "Stanovení specií arsenu v referenčních materiálech mořského původu metodou ICP-MS s generováním hydridů a vymrazováním." Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-380365.
Full textAbstract:
The aim of this work was to determine chemical species of arsenic in sea originating certified reference materials. Measurements were done using method of hydride generation. Hydrides were preconcentrated in liquid nitrogen cooled tube and detected using inductively coupled plasma mass spectrometry. During the testing of the method, mutual conversion of arsenic species was observed for inorganic arsenic, monomethyl arsenic and dimethylarsenic. Further study revealed that with presence of matrix and hydrogen peroxide, demethylation occured only in hydride generation phase, not during extraction. Dissociation of hydrogen peroxide in extracts was verified using catalase. End of the demethylation process was proved using measurement with addition of arsenic species standards. The newly invented procedure was used to determine arsenic species in reference materials with sufficient accuracy. Final results are compatible with results from different method, and already published results as well. Key words: speciation analysis, arsenic, hydride generation, seafood, inductively coupled plasma mass spectrometry
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"Evaluation of bromophenols in Hong Kong seafood and enhancement of bromophenol content in an aquacultured fish (sparus sarba)." 2002. http://library.cuhk.edu.hk/record=b5891228.
Full textAbstract:
Ma Wing-chi, Joyce.Thesis (M.Phil.)--Chinese University of Hong Kong, 2002.
Includes bibliographical references (leaves 131-148).
Abstracts in English and Chinese.
Abstract (in English) --- p.i
Abstract (in Chinese) --- p.iv
Acknowledgement --- p.vi
Contents --- p.viii
Abbreviation --- p.xii
List of Tables --- p.xiii
List of Figures --- p.xv
Chapter 1. --- Introduction --- p.1
Chapter 2. --- Literature review --- p.5
Chapter 2.1 --- Fisheries in Hong Kong --- p.5
Chapter 2.2 --- Flavor of seafood --- p.6
Chapter 2.2.1 --- Lipid-derived volatile aroma compounds --- p.7
Chapter 2.2.2 --- "Alcohols, aldehydes and ketones" --- p.8
Chapter 2.2.3 --- Enzymatic conversion of sulfur- and nitrogen-containing precursors --- p.9
Chapter 2.2.4 --- Thermally generated compounds --- p.9
Chapter 2.2.5 --- Bromophenols --- p.10
Chapter 2.2.5.1 --- General properties of bromophenols --- p.11
Chapter 2.2.5.2 --- Threshold of bromophenols --- p.14
Chapter 2.2.5.3 --- Toxicity of bromophenols --- p.17
Chapter 2.2.5.4 --- Previous studies about bromophenols --- p.19
Chapter 2.2.5.5 --- Bromophenols in aquacultured seafood --- p.20
Chapter 2.2.5.6 --- Possible dietary sources of bromophenols --- p.20
Chapter 2.2.5.7 --- Possibility of increasing bromophenol content in aquacultured fish --- p.23
Chapter 2.3 --- Criteria for selecting experimental fish model --- p.24
Chapter 3. --- Distribution of Bromophenols in selected Hong Kong seafoods --- p.27
Chapter 3.1 --- Introduction --- p.27
Chapter 3.2 --- Materials and methods --- p.28
Chapter 3.2.1 --- Sample collection and preparation --- p.28
Chapter 3.2.2 --- Simultaneous steam distillation-solvent extraction (SDE) --- p.30
Chapter 3.2.3 --- Gas chromatography / mass spectrometry (GC/MS) --- p.30
Chapter 3.2.4 --- Compound identification and quantification --- p.31
Chapter 3.2.5 --- Recoveries --- p.33
Chapter 3.2.6 --- Moisture determination --- p.34
Chapter 3.2.7 --- Statistical analysis --- p.34
Chapter 3.3 --- Results and discussion --- p.34
Chapter 3.3.1 --- Distribution of bromophenols in seafoods --- p.34
Chapter 3.3.1.1 --- Bromophenols in marine fishes --- p.49
Chapter 3.3.1.2 --- Bromophenols in mollusks --- p.49
Chapter 3.3.1.3 --- Bromophenols in crustaceans --- p.50
Chapter 3.3.2 --- Seasonal variations of TBCs --- p.51
Chapter 3.3.3 --- Bromophenols in diet contents --- p.52
Chapter 3.3.4 --- Bromophenol contents of freshwater fish --- p.53
Chapter 3.3.5 --- Relationship between the living habitats and bromophenol contents --- p.56
Chapter 3.3.6 --- Bromophenols as flavor compounds in seafoods --- p.58
Chapter 3.4 --- Conclusion --- p.59
Chapter 4. --- Distribution of Bromophenols in selected Hong Kong seaweeds --- p.61
Chapter 4.1 --- Introduction --- p.61
Chapter 4.2 --- Materials and methods --- p.62
Chapter 4.2.1 --- Sample collection and preparation --- p.62
Chapter 4.2.2 --- Simultaneous steam distillation-solvent extraction (SDE) --- p.63
Chapter 4.2.3 --- Gas chromatography / mass spectrometry (GC/MS) --- p.64
Chapter 4.2.4 --- Compound identification and quantification --- p.65
Chapter 4.2.5 --- Recoveries --- p.66
Chapter 4.2.6 --- Moisture determination --- p.67
Chapter 4.3 --- Results and discussion --- p.67
Chapter 4.3.1 --- Distribution of bromophenols in marine algae --- p.67
Chapter 4.3.2 --- Seasonal variations --- p.76
Chapter 4.3.3 --- Functions of bromophenols in marine algae --- p.79
Chapter 4.3.4 --- Marine algae as sources of bromophenols in marine environment --- p.80
Chapter 4.4 --- Conclusion --- p.81
Chapter 5. --- Enhancement of bromophenol contents in aquacultured fish by the development of bromophenol-rich fish feeds --- p.83
Chapter 5.1 --- Introduction --- p.83
Chapter 5.2 --- Materials and methods --- p.85
Chapter 5.2.1 --- Preparation of fish feeds --- p.85
Chapter 5.2.2 --- Storage conditions of fish feeds --- p.88
Chapter 5.2.3 --- Experimental animals --- p.88
Chapter 5.2.4 --- Solvent and chemicals --- p.90
Chapter 5.2.5 --- Extraction and quantification of bromophenols --- p.90
Chapter 5.2.5.1 --- Simultaneous steam distillation-solvent extraction (SDE) --- p.90
Chapter 5.2.5.2 --- Gas chromatography / mass spectrometry (GC/MS) --- p.91
Chapter 5.2.5.3 --- Compound identification and quantification --- p.92
Chapter 5.2.5.4 --- Recoveries --- p.93
Chapter 5.2.6 --- Moisture determination --- p.94
Chapter 5.2.7 --- Statistical analysis --- p.94
Chapter 5.2.8 --- Sensory test --- p.95
Chapter 5.3 --- Results and discussion --- p.96
Chapter 5.3.1 --- Bromophenol contents in wild-harvested and aquacultured fish --- p.96
Chapter 5.3.2 --- Development of bromophenol-rich fish feed --- p.99
Chapter 5.3.3 --- Effect of feeding the fish with the fish feed developed --- p.105
Chapter 5.3.4 --- Sensory evaluation on the flesh of the fish fed with different fish feeds --- p.121
Chapter 5.3.5 --- Growth of the fish fed with different fish feeds --- p.124
Chapter 5.4 --- Conclusion --- p.126
Chapter 6. --- General conclusion and significance of the study --- p.128
References --- p.131
29
Schneider, Evan. "The Epidemiology and Surveillance of Ciguatera Fish Poisoning in the Turks and Caicos Islands." Thesis, 2012. http://hdl.handle.net/10214/3966.
Full textAbstract:
Innovative ways to conduct disease surveillance are required to address the complexity of Ciguatera Fish Poisoning (CFP). Mixed methods were employed to explore CFP epidemiology and interdisciplinary approaches to its surveillance in the Turks and Caicos Islands (TCI). Quantitative analyses of cross-sectional data collected by the TCI’s National Epidemiology and Research Unit in 2010 demonstrated that a low percentage of residents reported lifetime histories of illness following fish consumption (3.9%). Furthermore, gender, age, island, and home remedy use were significantly associated with reported clinic visitation by ill individuals. Next, a multisectoral CFP surveillance model was conceptualized. A qualitative exploration of the model’s hypothetical integration into TCI’s health system revealed that several systemic and contextual factors could influence the future uptake of interdisciplinary CFP surveillance. Targeted interventions are recommended to improve national CFP surveillance and to facilitate the growth of interdisciplinary networks between stakeholders from TCI’s health, fisheries and environment sectors.Canadian Institutes of Health Research, Ontario Veterinary College, University of Guelph, Ministry of Health and Human Resources of the Turks and Caicos
30
Oh, Yan-Nam, and 胡淵南. "A Study of Discontinuous Deformation Analysis on Seafloor Stability Analysis." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/57718876689369598804.
Full textAbstract:
碩士國立海洋大學
河海工程學系
84
AbstractHydraulic sand fill is one of the most important reclamation method in land reclamation process. The reclaimed soil was transported by pumps and machines to the reclamation area. During the reclamation process, the excavation of soil would induce changes in the seafloor. Therefore, the assessment on the stability of excavated seafloor area is an important research topic.In this study, a numerical model based on Discontinuous Deformation Analysis (DDA) is generated for the assessment on the stability of excavated seafloor. DDA is similar to Finite Element Method (FEM) where the equations are listed in the similar manners. But, DDA has a discontinuous boundaries among the elements. Therefore, based on the dicontinuous concepts in DDA, the behaviors among the soil particles can be simulated. However, DDA does not incorporate drained conditions between In this study, modifications are tried to improve this deficiency. In this study, the deformation features in the seafloor are identified. Finally, a practical model is proposed based on the concept of DDA by Shi, and based on Linear Wave Theory, and considering wave loading to the upper surface of the seafloor, for the evaluation on the stability of seafloor area.In this study, the influence of different cutting direction is discussed. The block is cut by horizontal and vertical direction to discuss the influence of cutting direction. As shown in the results, the factor of safety adopted from the block cutted by horizontal direction is smaller than the block cutted by vertical direction.In this study, the influnce of slope angles, water depth and wave height are discussed. As shown in the results, as seafloor slope angle increases, the factor of safety would decrease. This shows that, as the slope angle increases, the seafloor would become unstable. As shown in the results, the factor of safety would decrease, as water depth increases. This results show that as the water depth increases, the load acted on the seafloor would increase, and thus the seafloor would become unstable.The results also showed, the factor of safety would decrease, as wave height increases. This shows that the wave height would influnce the stability of the seafloor. In order to prove the capability of this model, the results adopted in this study are compared with results adopted from STABL5 and BEM. As shown from the comparison results, the results adopted from the model proposed in this study, agreed with the results adopted from STABL5. Comparison are made with BEM to prove the analysis method on the water pressure. The results show that the results in this study agree with the results adopted from BEM (Boundary Element Method). The results for seafloor pore pressure in this study are compared with Madsen(1978). The results adopted in this study also agree with the results adopted from Madsen(1978).A study on the excavated seafloor are also made to discuss the influence of hydraulic sand fill activity on seafloor. The results in this study show that DDA is applicable in marine Geotechnical Engineering field.
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Lin, Yung-Chun, and 林詠竣. "The Analyses of Seafloor Drainage System Offshore Southwest Taiwan." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/38656219381366836355.
Full textAbstract:
碩士國立臺灣大學
海洋研究所
104
This study utilize the geographic and hydrological method of the Geographic Information System (GIS) to analyze the distribution and characters of the submarine system offshore southwest Taiwan. The study area is from 119°E to 121°E and 21°N to 23°50’N, where many submarine canyons such as Penghu, Kaoping, Fangliao and Formosa canyon have developed calculate the slope, aspect, numerical analysis on drainage, drainage density and spatial analysis on drainage pattern of seafloor topography, geomorphology theory is then applied to describe the regional characteristics and the features of the drainage related to the submarine canyons, and to discuss the relationship among the topography, structure and river developments. The bathymetry data with gird size 200×200 meters produced by the Ocean Data Bank in 2010 is used to this study. The results show that the drainage pattern of submarine canyons in the study area could be divided into 5 systems: Penghu (A), Kaoping (B), Formosa (C), Penghu East (D) and Penghu West (E). The B, D and a small part of A systems located on active margin are dominated by the parallel, lattice and rectangular drainage pattern. It is inferred that the parallel drainage pattern occurred in restricted areas on continental slope, while the lattice drainage pattern is possibly developed with the fractures or joints on seafloor. As for the rectangular drainage pattern, it could be related to the enlargement of fold or fault structures. The C, E and most parts of A system located on passive margin are dominated by the parallel and tree-like drainage pattern. We explained that submarine channels along the slope is easily developed on the steeper terrain, such as the continental slope in this area while the tree-like system pattern is mainly distributed on the flat continental shelf. The hydrological analyses reveal that the drainage density is on the average of 0.34 km-1 in A,C and E river drainage is a little higher than that in B and D river drainage (0.3 km-1). The average slope 2.8 degree at A, C and E river drainage is smoother compared to that 4.3 degree at B and D river drainage. 661 river numbers on the average for A, C and E are greater than that 556 river numbers on the average for B and D. The major aspects of A, C and E reflect the direction of canyons and sediment waves while the aspects of B and D may relate to the regions structure trend. The results of hydrological analyses show that the significant lineation or features are controlled by the steep seafloor caused from tectonics in the active margin off SW Taiwan. The topography will affect deeply the drainage pattern, the number and length of submarine channel, and the slope and aspect of topography. This study demonstrated that GIS could be successfully applied to analyze the drainage data of submarine canyon system and then to discuss the relationship between the development of the submarine anyon systems and regional structures.
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You, Jung Hwan. "Numerical Modeling of Seafloor Interation with Steel Catenary Riser." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11820.
Full textAbstract:
Realistic predictions of service life of steel catenary risers (SCR) require an accurate characterization of seafloor stiffness in the zone where the riser contacts the seafloor, the so- called touchdown area (TDA). This paper describes the key features of a seafloor-riser interaction model based on the previous experimental model tests. The seafloor is represented in terms of non-linear load-deflection (P-y) relationships, which are also able to account for soil stiffness degradation due to vertical cyclic loading. The P-y approach has some limitations, but simulations show good agreement with experimental data. Hence, stiffness degradation and rate effects during penetration and uplift motion (suction force increase) of the riser are well captured through comparison with previous experimental tests carried out at the Centre for Offshore Foundation Systems (COFS) and Norwegian Geotechnical Institute (NGI).
The analytical framework considers the riser-seafloor interaction problem in terms of a pipe resting on a bed of springs, and requires the iterative solution of a fourth-order ordinary differential equation. A series of simulations is used to illustrate the capabilities of the model. Due to the non-linear soil springs with stiffness degradation it is possible to simulate the trench formation process and estimate deflections and moments along the riser length. The seabed model is used to perform parametric studies to assess the effects of stiffness, soil strength, amplitude of pipe displacements, and riser tension on pipe deflections and bending stresses. The input parameters include the material properties (usually pipe and soil), model parameters, and loading conditions such as the amplitude of imposed dis- placements, tension, and moment. Primary outputs from this model include the deflected shape of the riser pipe and bending moments along riser length. The code also provides the location of maximum trench depth and the position where the maximum bending moment occurs and any point where user is interested in.
33
Guo, Meng-wei, and 郭孟維. "Automated Identification and Analysis of Stationary Targets on Seafloor with Sidescan Sonar Imagery." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/d6wmr5.
Full textAbstract:
碩士國立中山大學
海洋環境及工程學系研究所
96
The normal procedure for the detection of underwater stationary targets is mainly by the application of side-scan sonar. In addition, the identification of targets within the side-scan sonar imagery is primarily based on the visual observation of the operator. Due to its complexity and poor effectiveness, the visual observation procedure was gradually been substituted by numerical analysis procedures and programs. The purpose of the current investigation was dedicated to the development of an automatic image analysis program for the detection and identification of cubic concrete artificial reefs (2 m x 2 m x 2m) in the south-western coastal area off Taiwan. The major components and methodologies of the program include: (1)Image acquisition; side-scan sonar at 500 kHz and slant range at 75 m. (2)Feature extraction; grey level co-occurrence matrix. (3)Feature Classification; unsupervised Bayesian classifier. (4)Target identification; cluster analysis. (5)Target properties analysis, includes circumference, area, central coordinates and quantity of the targets. Program verification and optimal parameters determination were conducted with a sonograph (650 × 650 pixels) acquired at the Chey-Ding artificial reef site off Kaohsiung County. Feature functions employed in this program include entropy, homogeneity, and mean value. The identification accuracy can reach 93% at the most. In addition, the number of artificial reefs estimated by the program was within 9 to 20, while the actual number is 15. A realistic evaluation of this program was conducted with a sonograph (2048 × 6050 pixels) acquired at Fang-Liau artificial reef site off Pyngdong County. In addition to the cubic reefs, the targets at this site include cross-shaped artificial reefs with dimensions less than the cubic reefs. The sonograph was divided into smaller blocks with dimensions of 2048 x 550 pixels during evaluation. The results showed that each block can be evaluated based on the value of the seed point obtained by cluster analysis. The seed point which fells between 20.6 and 24.4 indicates that there are cubic reefs existed. Between 15.3 and 17.4 indicates that there are targets with smaller dimensions (i.e., crossed reefs) existed which can not be identified properly. Between 10.1 and 10.9, there is no target existed on the seafloor. The results indicated that the number of targets identified is between 122 and 240. According to the results of this investigation, the automatic image analysis program can improve the detection and identification of stationary targets within side-scan sonar imagery.
34
Chi, Chao-Ming. "Plastic Limit Analysis of Offshore Foundation and Anchor." 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8452.
Full textAbstract:
This study presents the applications of plastic limit analysis to offshore foundations and anchors, including the drag embedment anchors (DEAs) for mobile offshore drilling units (MODU’s) and spudcan foundations for jack-up platforms. In deep waters, drag embedment anchors are an attractive option for mooring of semisubmersible platforms due to low installation cost and high holding capacity; on the other hand, jack-up platforms are more stable than semisubmersible platforms but only can be placed in shallow waters.
The analyses of anchor capacities are developed for an idealized anchor comprising a rectangular fluke, a cylindrical shank, and a metal chain connected to the shank at the padeye. The anchor trajectory prediction during drag embedment is also developed by considering anchor behavior in conjunction with the mechanics of the anchor line. The results of simulations show that anchors approach at equilibrium condition rapidly during the embedment and both the normalized holding capacity and the anchor line uplift angle remain constants in this stage. Besides the geometry of the fluke, the properties of the shank and soil are also crucial factors in the anchor-soil interaction behavior.
Partial failure of mooring systems for floating structures will subject drag anchors to loads having an appreciable component outside of the intended plane of loading. Partial failure of mooring systems during hurricanes in recent years have generated an interest in understanding drag anchor performance under these conditions. The analysis presents the simulations of three dimensional trajectories of an anchor system subjected to an out-of-plane load component. For the conditions simulated in the example analyses, the anchor experienced a modest amount of continued embedment following partial failure of the mooring system; however, the ultimate embedment and capacity of the anchor is much less than what would have developed if the anchor had continued in its original trajectory within the plane of intended loading.
The analyses of the spudcan foundation of jack-up units include preloading, bearing capacity, and the displacement assessment. When the contribution of the soil moment resistance is considered, a three-stage assessment procedure is recommended: superposing environmental forces on the plot of yield surface, determining the value of yield function corresponding to the external forces, and computing the factor of safety of the spudcan. The results of the assessment may be ambiguous while the different yield functions are employed to analyze the spudcan in soft clay.
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Almasoumi, Abdullah Muhammad Sultan. "Monte Carlo model of a capture gamma ray analyzer for a seafloor core sample." Thesis, 1989. http://hdl.handle.net/1957/38226.
Full textAbstract:
Of great benefit, but not limited to seafloor mineral
exploration, is a technique that fairly rapidly determines the
composition of a drilled vibracore (in a time comparable to the time
involved in obtaining the core). The rapid assessment is desired to
predict whether a given region warrants further exploration by
coring.
A proposed monitoring system, based on neutron capture gamma
ray analysis, consists of a container tank filled with water and
tubular extensions that house a Cf-252 neutron source and a
detector positioned within the tank. The core sample is passed
through the system in stop and count steps. The net count rates, due
to "signature" capture gamma rays from neutron capture in elements
in the core sample, are proportional to the amount of the element
responsible for emitting the capture gamma ray.
The proposed system was modeled and simulated by the Monte Carlo
method to predict the relationship between the response of the
detector and the elemental concentrations within the sample.
Accurate and detailed treatment of neutron transport and gamma ray
production and attenuation within the system were employed not only
to predict the relationship of the photopeak responses with respect
to elemental concentrations, but also to permit investigation of the
design parameters and structural material changes in the system.
The developed Monte Carlo code utilizes a variety of variance
reduction techniques, such as implicit absorption with Russian
Roulette and deterministic production of the gamma rays of interest,
along with a form of correlated sampling to predict simultaneously
the responses over a range of interest of the elemental
concentrations. The predicted results were compared with predictions
obtained from a well established general purpose Monte Carlo code
(MCNP).Graduation date: 1990
36
Kobara, Shinichi. "Regional Analysis of Seafloor Characteristics at Reef Fish Spawning Aggregation Sites in the Caribbean." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7317.
Full textAbstract:
Overfishing of stock and decreasing biodiversity are grave concerns for the U.S. and the rest of the world. Understanding and applying spatial and temporal information of marine species’ reproductive ecology and critical life habitat is vital to the development of effective strategies for marine resource management. In the Caribbean, one of the critical science gaps hindering effective management is the lack of information on how environmental factors may make fish spawning aggregation (FSA) sites optimal for spawning. Understanding the patterns of seafloor characteristics of spawning aggregation sites is of great interest to managers who need a means to efficiently design marine protected areas to help rebuild regional fish stocks.
The specific goals of the study were: (1) to map the seafloor at historically known grouper and snapper spawning aggregation sites in three different countries, and (2) to characterize quantitatively the geomorphology of the sites including horizontal and vertical curvature profiles of the reefs, bottom depth at spawning sites, distance between spawning sites and shelf-edges/reef promontory tips, and the shortest distance between the spawning sites and 100 m water depth. These data were field-collected with a GPS and single-beam eco-sounder that provided latitude/longitude and depth. The point data were interpolated to surfaces in GIS to determine slope, aspect, curvature, and distance from spawning sites and three-dimensional reef structures.
This study revealed that all 12 known Nassau grouper spawning aggregation sites in Belize and 5 known sites in the Cayman Islands were located at convex-shaped seaward extending reefs (reef promontories) jutting into deep water, within 1 km of reef promontory tips. However, spawning aggregations did not always occur at the tips of reef promontories, though all were found along the shelf edges within 1 km of promontory tips. Sixteen sites were multi-species spawning sites. These general characteristics were used to predict an undiscovered multi-species spawning aggregation in Belize. A successful prediction in Belize, together with the compiled data from multiple sites indicate: 1) reef promontories are vital locations for transient reef fish spawning aggregations, and 2) this study provides a potential tool for prediction of unknown spawning sites in the Caribbean.
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Chen, Kuan-Ting, and 陳冠廷. "Seafloor structure analysis with high resolution bathymetry survey in the northern margin of the South China Sea." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/36840949481023116864.
Full textAbstract:
碩士國立中央大學
地球物理研究所
97
South China Sea (SCS) is located in the East Asia, which is one of marginal seas in western Pacific. The northern and southern margin belong to passive continental margin and the eastern boundary of SCS is located along the Manila Trench. According to Tapponnier et al., the collision of Indian Plate and the Eurasia Plate was started in early-middle Cenozoic and caused the southeastward escape of Indochina block, eastern escape of China block and formed the left-lateral Red River Fault zone. The block and fault movements could cause the spreading of SCS. Based on the result of magnetic lineation dating, SCS started spreading in 37 Ma and stopped in 15 Ma. The major method of this study is using multibeam bathymetry to identify the detailed seabed features on the northern margin of SCS. The seabed features including submarine canyons, lineate topographic highs, submarine volcanoes, slumping structures and submarine landslides. The lineate topographic highs are located near foot of the continental slope. Comparing seismic profiles with the past studies, we believe the volcanism highs were formed by the post-rifting mantle magma intrusion. The grouping volcanoes are locating at the Dongsha Rise area. Dongsha Rise movement was a zone of igneous activity, the igneous activity made the crust uplift and created submarine volcanoes in this area. We propose that the volcanoes were formed in the same igneous activity with Dongsha Rise (~ 5 Ma). The submarine canyon erosion formed the slump structures on the continental slope. Based on sub-bottom profiles, we have several acoustic transparent zones (ATZ) in the shallow sediment in our study area. All the ATZ are located in three places: continental slope foots, channel of submarine canyons and foot around the volcanism highs. We believe that the deposition of debris flow can account for the ATZ layers. We have used 9 single-channel seismic profiles (SCS) from NGDC (National Geophysical Data Center) and 20 multi-channel seismic profiles (MCS) in order to compare with bathymetry and the structures. In the other hand, we made newly sediment thickness and basement depth distribution figures by these seismic profiles. In the southwestern slope of Dongsha Rise, we have found a lot of lineate pockmarks. The sizes of pockmarks are variant, about hundreds to thousand meters in diameter. According the drilling studies, this area could have a rich potential of gas hydrate. Hence, we suggest that the pockmarks are related to the free gases. By calculating the parameters of pockmarks shape and bathymetry, we noticed that the slope gradient and contour trends of bathymetry control the size and the trend of most of pockmarks. Besides, there are many slumpings and two landslide structures in the same area. We suggest that the slumping structures may reduce the weighting of the underneath gas-hydrate, and therefore release the gas. The upward migration of free gas may finally form the pockmark structures on the seafloor.
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Chou, Chia-Yi, and 周佳儀. "Analysis of Seafloor Debris in Kenting National Park and the Feasibility of Applying Ocean Cleanup for Ecotourism." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/u7baar.
Full textAbstract:
碩士國立臺灣海洋大學
海洋事務與資源管理研究所
105
As people’s economic developing, the resulting debris also increased. Lots of the debris eventually flew into the ocean and caused serious damage. This study aims to survey the seafloor debris at the diving hotspots in Kenting National Park, and assess the feasibility of developing scuba diving ocean cleanup as ecotourism. The investigation was conducted during March 2016 to February 2017 in Kenting National Park. The first part was 14 seafloor debris surveys using line transection in four diving hotspots. The second part was a questionnaires survey of 12 scuba diving stores owners and 320 scuba divers’s attitude on marine debris. Results showed the seafloor debris density of coastal Wanlitong and outfall point were 0.032±0.044 items/m2 and 0.003±0.002 items/m2, respectively. The density of nearshore reef of the north garden and Tiaoshi MPA were 0.005±0.004 items/m2 and 0.006±0.001 items/m2, respectively. Wanlitong is a coastal diving and paddling hotspot, where the amount of seafloor debris was higher than the other three points. However, there was no significant difference between four spots (p = 0.144). In total, up to 85% of marine debris is land-based. Most of which was plastic (56%), followed by nylon (14%), others (11%), metal (6%), rubber (4%), paper(3%), glass (3%), cloth (2%) and styrofoam (1%). There was no significant difference between season and location (p> 0.05) tested by Kruskal-Wallis test. For the second part, store owners and diving tourists considered that the effective ways to reduce marine debris were to enhance marine environmental education and reducing origin source of debris. Only 41.7% of the businesses and 45.3% of diving tourists believed that ocean cleanup can reduce marine debris, but 72.2 % of the industry and 95.6% diving tourists were willing to participate in ocean cleanup. For the ocean cleanup ecotourism activities, diving tourists expected to include marine ecological environmental navigation (66.0%), provide scuba tank (65.0%), diving equipment rental (44.5%), and NT 1,000 was the most acceptable price (54.6%). This study suggests that the development of scuba diving ocean cleanup ecotourism is a feasible solution to reduce marine debris because it could clean up the local ocean, promote the tourism and water activities, and enhance the ocean knowledge of tourists, so to achieve the goal of education outreach.
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Anand, Ajay 1961. "Monte Carlo design and simulation of a shipboard ²⁵²Cf-based PGNAA analyzer for the sensitivity analysis of seafloor cores." Thesis, 1991. http://hdl.handle.net/1957/36235.
Full textAbstract:
The seabed is envisaged to meet the increased future demands for
minerals from the rapidly growing industrialized societies of the world.
Shipboard analysis of cores can significantly reduce the cost and time
spent at the exploratory drilling stage by obviating the need to go back
to land for analysis. It can further speed the exploration process by
enabling a quick modification of the exploration plan based on the
results of the shipboard analysis.
A ²⁵²Cf-based analyzer utilizing the prompt gamma neutron
activation analysis technique has been designed. The analyzer is a
spherical iron shell with the source at its center. The seabed core is
passed through a hollow composite tube which is positioned a short
distance directly below the source and the resulting prompt gamma rays
are collimated to a HPGe detector. The rest of the sphere is filled
with paraffin. The gamma ray flux at the detector is converted into a
count rate by using a semi-empirical detector response function. This
count rate data are then used to determine the sensitivity and detection
limits for the chosen elements (Mg, Al, Ti, Cr, Mn, Fe, Ni and Cu).
Monte Carlo simulations using the Monte Carlo neutron photon
coupled transport code, MCNP, were carried out for a parametric study of
important variables influencing the design of the analyzer. These
parameters included the moderator type, source to sample distance and
sample porosity. MCNP was then used to model the analyzer and to
generate the neutron flux profiles in the sample and the prompt gamma
flux at the detector.
Due to the non-availability of the prompt gamma data for most of
the elements of economic interest in the ENDF/B-V cross section
libraries associated with MCNP, the point kernel photon transport code
ISOSHLD-II (modified for high energy gamma rays) was used to generate
the gamma flux at the detector for specific elements. The ISOSHLD-II
source term was calculated based on known gamma production data (thermal
capture only) and the thermal neutron flux in the sample obtained from
MCNP computations.
The sensitivity and detection limits obtained from the isotopic
source based analyzer were compared for the case of aluminum with values
reported from reactor facilities.
The results obtained indicate that the analyzer designed in this
work could prove suitable for the on-line analysis of many elements of
economic interest in seabed cores at the 1 weight percent level.Graduation date: 1992
40
Roach, Lisa Aretha Nyala. "Temporal Variations in the Compliance of Gas Hydrate Formations." Thesis, 2012. http://hdl.handle.net/1807/44081.
Full textAbstract:
Seafloor compliance is a non-intrusive geophysical method sensitive to the shear modulus of the sediments below the seafloor. A compliance analysis requires the computation of the frequency dependent transfer function between the vertical stress, produced at the seafloor by the ultra low frequency passive source-infra-gravity waves, and the resulting displacement, related to velocity through the frequency. The displacement of the ocean floor is dependent on the elastic structure of the sediments and the compliance function is tuned to different depths, i.e., a change in the elastic parameters at a given depth is sensed by the compliance function at a particular frequency. In a gas hydrate system, the magnitude of the stiffness is a measure of the quantity of gas hydrates present. Gas hydrates contain immense stores of greenhouse gases making them relevant to climate change science, and represent an important potential alternative source of energy. Bullseye Vent is a gas hydrate system located in an area that has been intensively studied for over 2 decades and research results suggest that this system is evolving over time.
A partnership with NEPTUNE Canada allowed for the investigation of this possible evolution. This thesis describes a compliance experiment configured for NEPTUNE Canada’s seafloor observatory and its failure. It also describes the use of 203 days of simultaneously logged pressure and velocity time-series data, measured by a Scripps differential pressure gauge, and a Güralp CMG-1T broadband seismometer on NEPTUNE Canada’s seismic station, respectively, to evaluate variations in sediment stiffness near Bullseye. The evaluation resulted in a (- 4.49 x10-3± 3.52 x 10-3) % change of the transfer function of 3rd October, 2010 and represents a 2.88% decrease in the stiffness of the sediments over the period. This thesis also outlines a new algorithm for calculating the static compliance of isotropic layered sediments.