Gotowe bibliografie tematyczne / Thresher sharks

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Gotowa bibliografia na temat „Thresher sharks”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 1 lutego 2022

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Artykuły w czasopismach na temat "Thresher sharks"

Estrada, James A., Aaron N. Rice, Molly E. Lutcavage i Gregory B. Skomal. "Predicting trophic position in sharks of the north-west Atlantic Ocean using stable isotope analysis". Journal of the Marine Biological Association of the United Kingdom 83, nr 6 (grudzień 2003): 1347–50. http://dx.doi.org/10.1017/s0025315403008798.

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Trophic positions (TP) were estimated for the blue shark (Prionace glauca), shortfin mako (Isurus oxyrinchus), thresher shark (Alopias vulpinus), and basking shark (Cetorhinus maximus) using stable isotope ratios of carbon (δ13C) and nitrogen (δ15N). The basking shark had the lowest TP (3·1) and δ15N value (10·4‰), whereas the thresher shark had the highest values (4·5, 15·2‰). Mako sharks showed considerable variation in TP and isotopic values, possibly due to foraging from both inshore and offshore waters. Thresher sharks were significantly more enriched in δ15N than blue sharks and mako sharks, suggesting a different prey base. The δ13C values of thresher sharks and mako sharks varied significantly, but neither was significantly different from that of blue sharks. No statistical differences were found between our TP estimations and those derived from published stomach contents analyses, indicating that stable isotope data may be used to estimate the trophic status of sharks.

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Cartamil, D., N. C. Wegner, S. Aalbers, C. A. Sepulveda, A. Baquero i J. B. Graham. "Diel movement patterns and habitat preferences of the common thresher shark (Alopias vulpinus) in the Southern California Bight". Marine and Freshwater Research 61, nr 5 (2010): 596. http://dx.doi.org/10.1071/mf09153.

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The common thresher shark, Alopias vulpinus, is the basis of the largest commercial shark fishery in California waters. We used acoustic telemetry to determine the diel movement patterns and habitat preferences of this species in the Southern California Bight (SCB), where commercial fishing for the common thresher shark is concentrated. Eight common threshers (fork length: 122–203 cm) were tagged with temperature and depth-sensing acoustic transmitters and tracked for periods ranging from 22 to 49 h. Tracked sharks preferentially utilized deep offshore waters, and avoided shallower waters over the continental shelf. Mean rate of movement (ROM ± s.d.) was 2.15 ± 0.46 km h−1. ROM and angular concentration (r, a measure of relative linearity) both showed a strong daytime pattern, with highest values at dawn that decreased throughout the day, whereas nocturnal ROM and r were less variable. Daytime vertical movements consisted of either vertical excursions below the thermocline or relatively level swimming within the upper portion of the thermocline. Nocturnally, all sharks remained within the mixed layer. These findings suggest that the common thresher shark is primarily a daytime predator, and have relevance for estimating how the alteration of the set depth of fishing-gear could affect catch rates of this species in the SCB.

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Varghese, Sijo P., N. Unnikrishnan, Deepak K. Gulati i A. E. Ayoob. "Size, sex and reproductive biology of seven pelagic sharks in the eastern Arabian Sea". Journal of the Marine Biological Association of the United Kingdom 97, nr 1 (9.03.2016): 181–96. http://dx.doi.org/10.1017/s0025315416000217.

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Studies on reproduction in sharks are important for their management, since the attainment of sexual maturity has a substantial impact on their distribution, behaviour and biology. However, reproductive biology of large oceanic sharks is poorly studied in the Indian seas. In this study, the size structure, sex and maturity of pelagic thresher (Alopias pelagicus), bigeye thresher (A. superciliosus), oceanic whitetip shark (Carcharhinus longimanus), tiger shark (Galeocerdo cuvier), shortfin mako (Isurus oxyrinchus), longfin mako (I. paucus) and blue shark (Prionace glauca) in the eastern Arabian Sea are described based on 1449 specimens collected from gillnet-cum-longline landings at the Cochin fisheries harbour during 2013–2014. Sex ratios of sampled specimens were biased to males in pelagic thresher, bigeye thresher, tiger shark and blue shark, while females dominated in the specimens of oceanic whitetip shark. Females matured at greater lengths than males in all species except oceanic whitetip shark. Lengths at maturity for males were in the range of 189.05–286.56 cm, whereas those of females were in the range of 187.74–310.69 cm. Litter sizes of both the thresher shark species were always two, while in oceanic whitetip shark, litter size was 3–9 and 22–51 in tiger shark. Seasonal reproduction was noticed in oceanic whitetip shark and tiger shark. Pregnant females were not found in the blue shark, shortfin and longfin makos sampled during the study period. Reproductive aspects of pelagic thresher, bigeye thresher, oceanic whitetip shark, tiger shark, shortfin mako, longfin mako and blue sharks in the eastern Arabian Sea are generally consistent with earlier reports from other regions of the world's oceans. These preliminary findings should be useful to identify suitable management measures for the above shark species.

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van Bergen, Y. "NOT ALL THRESHER SHARKS KEEP WARM". Journal of Experimental Biology 208, nr 22 (15.11.2005): i. http://dx.doi.org/10.1242/jeb.01937.

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Dharmadi, Dharmadi, Mahiswara Mahiswara i Kamaluddin Kasim. "CATCH COMPOSITION AND SOME BIOLOGICAL ASPECTS OF SHARKS IN WESTERN SUMATERA WATERS OF INDONESIA". Indonesian Fisheries Research Journal 22, nr 2 (24.01.2017): 99. http://dx.doi.org/10.15578/ifrj.22.2.2016.99-108.

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This study was conducted in western Sumatera and since October 2013 to June 2014. The sampling locations in Banda Aceh and Sibolga-North Sumatera which were the largest base of fisheries in western Sumatera region. Shark landing recorded by enumerators was used as sampling data daily . This research aim to describ sex ratio, size composition, catch composition of sharks, and length at first maturity. In Banda Aceh, the sharks as target fish collected by sorting the bycatch from tuna longlines and tuna handlines. In Sibolga, sharks is bycatch from fish net, bottom gillnet and purse seine. Overall, there were 20 species of shark caught in west Indian Ocean and landed at those fish landing sites, dominated by Spot tail shark (23%) and Silky shark (13%), whereas Hammerhead shark contributed about 10% and Oceanic whitetip shark was only less than 1%. Almost of Spot tail shark, Silky shark, and Scalloped hammerhead that caught in that area were immature, while for the almost part of Tiger shark and Pelagic thresher were matured. The sex ratios for Spot tail shark, Silky shark, Tiger shark, Pelagic thresher, and Scalloped hammerhead caught and landed at Lampulo and Sibolga fish landing sites were not balance. The length at first maturity for Spot tail shark was Lm=87,1 cm and Lm = 213,2 cm total length for Tiger shark.

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Rogers, Paul J., Charlie Huveneers, Brad Page, Derek J. Hamer, Simon D. Goldsworthy, James G. Mitchell i Laurent Seuront. "A quantitative comparison of the diets of sympatric pelagic sharks in gulf and shelf ecosystems off southern Australia". ICES Journal of Marine Science 69, nr 8 (24.07.2012): 1382–93. http://dx.doi.org/10.1093/icesjms/fss100.

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Abstract Rogers, P. J., Huveneers, C., Page, B., Hamer, D. J., Goldsworthy, S. D., Mitchell, J. G., and Seuront, L. 2012. A quantitative comparison of the diets of sympatric pelagic sharks in gulf and shelf ecosystems off southern Australia. – ICES Journal of Marine Science, 69: . Predator–prey dynamics represent an important determinant in the functioning of marine ecosystems. This study provides the first quantitative investigation of the diets of sympatric pelagic shark species in gulf and shelf waters off southern Australia. Stomachs of 417 sharks collected from fishery catches between 2007 and 2011 were examined, including 250 bronze whalers, 52 shortfin makos, 49 dusky sharks, 39 smooth hammerheads, and 27 common threshers. Dusky sharks had the highest dietary diversity of the five species examined. We found overlap in the consumption of cephalopods, small pelagic teleosts, crustaceans, and benthic teleosts in bronze whalers, dusky sharks, and smooth hammerheads, and preliminary evidence of specialization in the highly migratory species, the common thresher and the shortfin mako. Findings were discussed and compared with previous studies in other temperate marine ecosystems. This study will significantly improve the understanding of the ecological roles of these top predators in the gulf and shelf habitats off southern Australia, and enhance the ecosystem models being developed for this unique bioregion.

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Syme, Douglas A., i Robert E. Shadwick. "Red muscle function in stiff-bodied swimmers: there and almost back again". Philosophical Transactions of the Royal Society B: Biological Sciences 366, nr 1570 (27.05.2011): 1507–15. http://dx.doi.org/10.1098/rstb.2010.0322.

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Fishes with internalized and endothermic red muscles (i.e. tunas and lamnid sharks) are known for a stiff-bodied form of undulatory swimming, based on unique muscle–tendon architecture that limits lateral undulation to the tail region even though the red muscle is shifted anteriorly. A strong convergence between lamnid sharks and tunas in these features suggests that thunniform swimming might be evolutionarily tied to this specialization of red muscle, but recent observations on the common thresher shark ( Alopias vulpinus ) do not support this view. Here, we review the fundamental features of the locomotor systems in lamnids and tunas, and present data on in vivo muscle function and swimming mechanics in thresher sharks. These results suggest that the presence of endothermic and internalized red muscles alone in a fish does not predict or constrain the swimming mode to be thunniform and, indeed, that the benefits of this type of muscle may vary greatly as a consequence of body size.

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Bernal, Diego, Douglas Syme, Jeanine Donley i Chugey Sepulveda. "Divergent locomotor muscle design among thresher sharks". Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology 153, nr 2 (czerwiec 2009): S67. http://dx.doi.org/10.1016/j.cbpa.2009.04.013.

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Tsai, Wen-Pei, Kwang-Ming Liu i Yi-Jay Chang. "Evaluation of Biological Reference Points for Conservation and Management of the Bigeye Thresher Shark, Alopias superciliosus, in the Northwest Pacific". Sustainability 12, nr 20 (19.10.2020): 8646. http://dx.doi.org/10.3390/su12208646.

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Full stock assessment of sharks is usually hindered by a lack of long time-series catch and effort data. In these circumstances, demographic and per-recruit analyses may provide alternate approaches to describe population status because these methods can be applied to estimate biological reference points (BRPs) for shark stocks. However, the appropriate level of BRPs for sharks is difficult to determine, given the expected low reproductive rates. To determine which BRPs are most appropriate for the CITES-listed species—bigeye thresher shark, Alopias superciliosus, a stochastic demographic model with Monte Carlo simulations and per-recruit models were used to estimate BRPs in this study. The results indicated that conventional fishing mortality-based BRPs (FBRPs) derived from per-recruit models may result in a clear population decline. Our analyses also demonstrated that the bigeye thresher population in the Northwest Pacific will stabilize only if demographic-based FBRP is implemented. The FBRP estimated based on the stochastic demographic model was 0.079–0.139 y−1, which was equivalent to SPR = 50–70%. The findings strongly suggested that more conservative threshold FBRPs should be implemented to ensure sustainable utilization of the bigeye thresher stock. The present study provides new and strategically important information on the population dynamics of the bigeye thresher in the Northwest Pacific, which can be used to help fishery managers to adopt more efficient management measures for this stock. It is also suggested that this approach can be applied to other shark species with limited catch and effort data.

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Kabasakal, Hakan. "A Note on the Occurrence of the Thresher Shark, Alopias Vulpinus from South-Western Black Sea". Journal of the Marine Biological Association of the United Kingdom 78, nr 2 (maj 1998): 685–86. http://dx.doi.org/10.1017/s002531540004176x.

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On 8 November 1996, a female thresher shark (Figure 1) was caught in a purse seine full of bluefish (Pomatomus saltator), off Şile (41°15′24″N 29°35′30″E). The shark was photographed and tooth samples from lower and upper jaws were removed, and placed in the personal collection of the author. The total length of the shark was 453 cm.Alopias vulpinus (Bonnaterre, 1788) is one of the three species of the family Alopiidae (Compagno, 1984). The thresher shark occurs worldwide, usually far offshore in temperate to tropical oceans, but where there are schools of bluefish, mackerel and squid, it may come close to the shore in pursuit. It is one of the most common shark species in the Mediterranean Sea (Quero, 1984). According to Devedjian (1926), Rhasis Erazi (1942) and Slastenenko (1955–1956) thresher sharks occur in the Sea of Marmara, the Bosphorus and the Black Sea, however, over the last 40 years there have been no reports of this species in these areas (Ak§iray, 1987).

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Rozprawy doktorskie na temat "Thresher sharks"

Abercrombie, Debra. "Efficient PCR-Based Identification of Shark Products in Global Trade: Applications for the Management and Conservation of Commercially Important Mackerel Sharks (Family Lamnidae), Thresher Sharks (Family Alopiidae) and Hammerhead Sharks (Family Sphyrnidae)". NSUWorks, 2004. http://nsuworks.nova.edu/occ_stuetd/131.

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Shark populations worldwide are suspected to be in severe decline due to domestic and international markets for trade in shark products, especially dried fins in Asian markets, and as a result of bycatch mortality in multi-species fisheries. The management of sharks on a species-specific basis has become imperative for shark conservation, particularly in regions where numerous species are heavily fished, because sharks with differing life-history characteristics respond differently to exploitation. However, many commercially exploited sharks are morphologically similar and not easily identifiable to the species level. This problem is exacerbated when it comes to identifying detached fins, processed carcasses (logs), and filets or steaks at the dock or in trade. To address these species-identification problems and make available an accurate but practical, DNA-based forensic method for use in conservation and management of sharks, I have developed a highly streamlined genetic assay based on multiplex polymerase chain reaction (PCR) and species-specific primers derived from interspecific DNA sequence differences in the nuclear ribosomal internal transcribed spacer 2 (ITS2) locus of sharks. This forensic assay allows accurate identification of body parts from ten shark species commonly exploited worldwide for their meat and/or fins. In this thesis, I report on the development and use of this assay in the form of two separate suites of species-specific PCR primers that can be used in a high-density multiplex format to achieve rapid and accurate species identification. Chapter 1 of this thesis describes a suite of species-specific primers and multiplex PCR assay that simultaneously distinguishes among seven pelagic shark species: four species of mackerel sharks: shortfin mako (Isurus oxyrinchus), longfin mako (Isurus paucus), porbeagle (Lamna nasus) and salmon (Lamna ditropis); and the three species of alopiid (thresher) sharks: common thresher (Alopias vulpinus), bigeye thresher (Alopias superciliosus) and pelagic thresher (Alopias pelagicus). The second species-specific primer suite, described in chapter 2, simultaneously identifies the three globally distributed and most commercially important species of hammerheads: the great hammerhead (Sphyrna mokarran), scalloped hammerhead (Sphyna lewini) and the smooth hammerhead (Sphyrna zygaena). The species-specific PCR primers and forensic approach described here provide an efficient, straightforward technique that can be used in conservation and management relevant contexts where large volumes of samples need to be screened quickly. Preliminary testing of dried fins from the Hong Kong market and confiscated fins from U.S. and South African law enforcement activities suggests that this genetic technique will be useful for large-scale survey applications, such as monitoring the species composition of the fin trade as well as improving fisheries law enforcement capabilities. The efficient nature of the general forensic approach reported here may also make it useful as a model applicable to monitoring trade in other wildlife products on a global scale.

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Cartamil, Daniel Patrick. "Movement patterns, habitat preferences, and fisheries biology of the common thresher shark (Alopias vulpinus) in the Southern California Bight". Diss., [La Jolla] : University of California, San Diego, 2009. http://nsgl.gso.uri.edu/casg/casgy09002.pdf.

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Thesis (Ph. D.)--University of California, San Diego, 2009.
Title from first page of PDF file (viewed October 13, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.

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Grepp, Katarina. "Cleaning interactions by bluestreak cleaner wrasse (Labroides dimidiatus) and moon wrasse (Thalassoma lunare) on pelagic thesher sharks (Alopias pelagicus)". Thesis, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-398041.

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Cleaning symbioses are a well-studied mutualism among marine species. However, the interactions occurring between cleaner fish and sharks are lacking in research, which makes it a target for further investigation. With this study, intentions were to analyse the behaviour of two kinds of cleaner species, bluestreak cleaner wrasse (Labroides dimidiatus) and moon wrasse (Thalassoma lunare), to be able to distinguish differences in cleaning behaviour on pelagic thresher sharks (Alopias pelagicus). A total of 68,4 hours of video was recorded on the edge of a seamount outside of Malapascua, called Monad Shoal, during 18 days in January 2018. The number of interactions were divided into two categories, where the behaviour was classified as an inspection or a bite and could occur on different patches of the sharks’ body (head, gills, body, dorsal, pectoral, pelvic or caudal fin). In total 118 events occurred which comprised in total 4079 interactions from the two cleaner species. Of these interactions 3626 were considered inspections and 453 were bites. Bluestreak cleaner wrasse conducted 3598 of the inspections and 28 of the inspections were conducted by the moon wrasse. All bites were conducted by bluestreak cleaner wrasses. The results indicated a preference in patches of the body to inspect, where the pelvis got the most inspections on 34,1 %, followed by the pectoral fins on 22,8 %. The dorsal fin and the gills accounted for the least number of bites, with 1,3 % on the dorsal and 1,4 % on the gills. Furthermore, a difference in inspected patches between males and females were discovered, where females got significantly more inspections on their head, gills, body, dorsal and pectoral fin. The pelvis and caudal fin did not show any significant differences.

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Zhang, Yong Zhou, i 張永州. "Reproduction of the bigeye thresher shark, alopias superciliosus in the northeastern waters of Taiwan". Thesis, 1994. http://ndltd.ncl.edu.tw/handle/68258483187619833507.

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Tsai, Wen-Pei, i 蔡文沛. "Stock assessment of the pelagic thresher shark, Alopias pelagicus in the waters of northeastern Taiwan". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/57849307504350860232.

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碩士
國立臺灣海洋大學
環境生物與漁業科學學系
92
Abstract A stochastic stage-based model was constructed to assess stock status of the pelagic thresher shark, Alopias pelagicus in the northeastern Taiwan waters. In addition, the spawning per recruit model was used to compare with stage-based results. Based on previous biological information, the life history of the pelagic thresher shark was represented as four stages : neonates ( 0-1 yr ), juveniles ( 1-6 yr ), subadults ( 6-8 yr ), and adults ( 8-30 yr ). The results of stochastic stage-based model indicated that the stock increase apparently ( λ=1.082 yr-1, r=0.079 yr-1 ) by randomly selecting natural mortality rates and proportion of maturity. Furthermore, if the stochastic fishing mortality rate was introduced into the model, the abundance will increase slightly ( λ=1.023 yr-1, 95% C.I.= 0.989~1.054 yr-1 ) and advance 25.5% and 61.6% for 10 yr and 20 yr projections, respectively. Spawning per recruit was estimated to be 41.9%, which was greater than the precautionary reference point at 35% or 40%. All strategies showed that the pelagic thresher shark abundance is stabilized under current condition. However, this model is sensitive to juveniles and adults, which implies that close monitoring on these stages is needed to ensure sustainable utilization of the stock.

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Juang, Wen-Lung, i 莊文龍. "Stock assessment of the bigeye thresher shark, Alopias superciliosus in the northeastern waters off Taiwan". Thesis, 2001. http://ndltd.ncl.edu.tw/handle/65028293449886361369.

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碩士
國立海洋大學
漁業科學學系
89
A total of 34,366 specimens of the bigeye thresher shark, Alopias superciliosus, collected at Nanfanao fish market from 1989 to 1999 were analyzed by using MULTIFAN to estimate the parameters of von Bertalanffy growth function (VBGF) and age composition. The parameters of VBGF for this species were estimated as follows: growth coefficient (K) ranged from 0.080 yr-1 to 0.098 yr-1, asymptotic precaudal length (L∞) ranged from 233cm to 248cm and age at zero length (t0) ranged from -4.3 yr to -3.4 yr. Mean age at capture seemed decrease in recent year. Instantaneous total mortality rate (Z) ranged from 0.26 yr-1 to 0.48yr-1, natural mortality rate (M) being 0.154yr-1, and exploitation rate (E) ranged from 41% to 68% for 1989-1999. Yield-per-recruit was estimated to be 18.9kg and the maximum potential yield-per-recruit was 20.9kg for 1999, exploitation rate, therefore, is only 10.6% left to develop. Spawning per recruit ranged from 4% to 30% for 1989-1999. In order to achieve the standard of SPR% of 30%, the E values must be decreased to 38%. Further more catch-per-unit-effort (CPUE) from 1995 to 1999 is decreasing gradually. In this study, it is suggested that fishing mortality rate for the bigeye thresher shark in the northeastern waters off Taiwan should be properly decreased to 0.096yr-1. Keywords: Alopias superciliosus, Stock assessment, MULTIFAN, Yield-per-recruit, Spawning stock biomass per recruit

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HUA, LIN SHIH, i 林世華. "Stock assessment of the bigeye thresher shark, Alopias superciliosus in the northeastern waters off Taiwan------ a demographic approach". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/29361048788925698952.

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碩士
國立海洋大學
漁業科學學系
90
Stock assessment of the bigeye thresher shark, Alopias superciliosus in the northeastern waters off Taiwan was conducted with demographic approach: stage based model and age-structured model. Four life stages of A. superciliosus was determined based on its biological characteristics as neonate, juvenile, pregnant adult and resting adult. Natural mortality of each stage estimated from Peterson and Wroblewski (1984) was as follows: M1=0.175, M2=0.121, M3=0.108, M4=0.108 yr-1. The results of stage-based model indicated that the finite rate of population increase λ= 1.05, intrinsic rate of increase r= 0.049 withuot fishing mortality, while the bigeye thresher stock decreased slowly (λ=0.94, r=-0.065) under current fishing condition. Similar results were obtained from age- structured model. The results of stochastic stage-based model indicated that the bigeye thresher stock is declining (λ=0.929 with 95% C.I.=0.882~0.975) under current fishing condition and will reduce 52.4% and 77.3% for 10 yr and 20 yr projection, respectively. The stock is sustainable as long as fishing mortality maintains 0.067yr-1 that is exploitation rate E=37% or neonate and juvenile stages was protected.

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Zhang, Yu-Ting, i 張鈺廷. "Virtual population analysis and spawning per recruit estimation of the pelagic thresher shark, Alopoas pelagicus in the northeastern waters off Taiwan". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/31114506742757267367.

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Książki na temat "Thresher sharks"

ill, Nicol Ernest, i Turner Elizabeth ill, red. Thresher sharks. Vero Beach, Fla: Rourke Enterprises, 1988.

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Tiburones trilladores. Vero Beach, FL: Rourke Corp., 1992.

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Stick, Kurt C. Summary of the 1988 Washington/Oregon experimental thresher shark gill net fishery. Olympia, WA: State of Washington, Dept. of Fisheries, Marine Fish Program, 1989.

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Stick, Kurt C. Summary of the 1986 and 1987 Washington/Oregon experimental thresher shark gill net fishery. Olympia, WA: State of Washington, Dept. of Fisheries, Marine Fish Program, 1988.

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Thresher Sharks (Sharks Set II). Checkerboard Books, 2005.

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Rake, Jody S. Thresher Sharks: A 4D Book. Capstone, 2018.

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Rake, Jody S. Thresher Sharks: A 4D Book. Capstone, 2018.

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Palmer, Melissa. Asher the Thresher Shark. Routledge, 2020. http://dx.doi.org/10.4324/9781003126683.

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Liebers, Larry. Thresher: The Shark That Wouldn't Die. Authorhouse, 2004.

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Interjurisdictcional fishery management plan for thresher shark off the coasts of California, Oregon and Washington. Portland, Or: Pacific States Marine Fisheries Commission, 1990.

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Części książek na temat "Thresher sharks"

"Common Thresher, or Fox Shark, Zorro Thresher Shark (Common Thresher, Alopias vulpinus)". W The Adriatic Sea Encyclopedia, 98–99. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-50032-0_142.

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Palmer, Melissa. "Asher the Thresher Shark". W Asher the Thresher Shark, 2–26. Routledge, 2020. http://dx.doi.org/10.4324/9781003126683-1.

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Streszczenia konferencji na temat "Thresher sharks"

Cha, Youngsu, Matteo Verotti, Horace Walcott, Sean D. Peterson i Maurizio Porfiri. "Energy Harvesting From Base Excitation of a Biomimetic Fish Tail Hosting Ionic Polymer Metal Composites". W ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3127.

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In this study, we seek to understand the feasibility of energy harvesting from the tail beating motion of a fish through active compliant materials. Specifically, we analyze energy harvesting from the undulations of a biomimetic fish tail hosting ionic polymer metal composites (IPMCs). The design of the biomimetic tail is specifically inspired by the morphology of the heterocercal tail of thresher sharks. We propose a modeling framework for the underwater vibration of the biomimetic tail, wherein the tail is assimilated to a cantilever beam with rectangular cross section. We focus on base excitation in the form of a superimposed rotation about a fixed axis and we consider the regime of moderately large–amplitude vibrations. In this context, the effect of the encompassing fluid is described through a nonlinear hydrodynamic function. The feasibility of harvesting energy from an IPMC attached to the vibrating structure is assessed and modeled via an electromechanical framework. Experiments are performed to validate the theoretical expectations on energy harvesting from the biomimetic tail.

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Smits, Aletta, Annette Schenk i Lizet Van Ewijk. "Stealing their beer time: turning studying for medical progress tests into a social game". W CARPE Conference 2019: Horizon Europe and beyond. Valencia: Universitat Politècnica València, 2019. http://dx.doi.org/10.4995/carpe2019.2019.10189.

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Because of the specific requirements of the medical profession, it is imperative that doctors-to-be have a wide range of knowledge at their fingertips. In order to facilitate this, most medical programmes employ some kind of overall ready-knowledge test: a test that is not connected to one specific course, but contains questions on all the facts and figures from all the courses in the entire curriculum. The test is generally administered four times a year to all students participating in the program. First year students are required to answer the same questions as fourth year students. However, for first year students the thresh hold for passing the exam is at a lower level.The aim of this progress test is threefold: (1) testing if the knowledge of students is up to par; (2) making sure that students understand that being a medical professional means continuing to have all the knowledge readily available at all times; and (3) changing the way students prepare for a test: not a big cramming session for one test the night before the test happens and then forget about it, but continuously working on keeping knowledge at an acceptable level. This last goal has, however, not been achieved. While students appreciate the test because of the sense of progress it provides them, in a Dutch study into its effects, students widely report that also for this test, they still prepare in cramming sessions. The result is still that the retention level of the ready knowledge is not at the level it should be.Since studies have extensively shown that students enjoy studying in a gamified process more, that they more easily get into 'a flow', and that the retention rates of knowledge acquired during a flow are higher, we propose to attempt to change the way the student prepare for the test by gamifying the process. Gamifying the process neatly matches a feeling of progress that facilitates the control students feel over their studying process and over mastering the material. Rather than losing points for not having questions correct, a student gains levels/XP/avatar strength whenever he/she masters a specific topic, or nails a series of questions on different topics within a specific time frame (‘challenge’), etc. The game mechanics and the design of the gaming world will be two important aspects of this project. A third important aspect will be the distribution of knowledge in the game and the way topics are brought up again, practiced again, or combined with other topics. The algorithm that lie at the basis of that need to be smart, adaptive and non-repetitive. A final important aspect of this process concerns the question of how to make playing this game part of the social life of students (battles on Friday afternoon for instance, or leader boards in the hallway).As mentioned above: Research indicates that gamification has a positive effect on retention and on commitment. If we then also manage to embed the game in a social setting, it can be truly called a “stealing their beer time”-type of intervention: moments that they would normally chill out and have a beer with their peers have now turned into moments where they still chill out, maybe still have a beer, but also study.We would like to share our ideas and invite partners of other programs (not necessarily medical) to join in our quest to build an overall knowledge assessment game in a modular way.

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