Thematische Bibliographien / CMU Artic

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Auswahl der wissenschaftlichen Literatur zum Thema „CMU Artic“

Autor: Grafiati

Veröffentlicht am 24. Juni 2021

Zuletzt aktualisiert am 7. Februar 2022

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Zeitschriftenartikel zum Thema "CMU Artic"

MARTINIČ, SANDRA. „ENERGETSKA TEKMA ZA ARKTIKO“. NOVA NEVOJAŠKA TVEGANJA/ NEW NON-MILITARY RISKS, VOLUME 2015/ ISSUE 17/3 (30.09.2015): 45–62. http://dx.doi.org/10.33179//bsv.99.svi.11.cmc.17.3.3.

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Arktika je podvržena podnebnim spremembam, ki odkrivajo njen energetski, politični in gospodarski potencial in jo spreminjajo v novi Orient. Energetski viri, ki se skrivajo pod Arktičnim oceanom, lahko podaljšajo življenjsko dobo držav, ki so odvisne od nafte. Brez razvoja držav in tehnologije, ki bi nadomestila svetovno odvisnost in vedno hitrejšo porabo nafte, ostane edina rešitev iskanje novih virov energije. Arktika ponuja možnost, a brez ustrezne vrtalne tehnologije je dostopnost do virov nemogoča. Številna vprašanja ob tem ostajajo odprta. Ali bodo geopolitični interesi krojili prihodnost Arktike in s tem akterjev? Ali so države zmožne rešiti spore miroljubno? Povečana vojaška prisotnost ne kaže na mirno prihodnost, sploh s povečano napetostjo med Rusijo in ZDA. The Arctic is subjected to climate changes, which are revealing its energy, political and economic potential, and are turning it into the new "Orient". Energy resources hidden beneath the Arctic Ocean can extend the lifespan of the countries dependent on oil. Without further development of countries and the technology to substitute global dependence and the increasingly fast oil consumption, the only solution remaining is the search for new energy resources. The Arctic offers this possibility; however with no adequate drilling technology, the access to resources is impossible. Several questions still remain open in this respect. Will the geopolitical interests shape the future of the Arctic and, consequently, the actors? Are the countries able to resolve conflicts in a peaceful manner? Increased military presence in the Arctic indicates a not so peaceful future, especially due to the increased tensions between Russia and the United States.

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Zawierucha, Krzysztof, Tobias R. Vonnahme, Miloslav Devetter, Małgorzata Kolicka, Marta Ostrowska, Sebastian Chmielewski und Jakub Z. Kosicki. „Area, depth and elevation of cryoconite holes in the Arctic do not influence Tardigrada densities“. Polish Polar Research 37, Nr. 2 (01.06.2016): 325–34. http://dx.doi.org/10.1515/popore-2016-0009.

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Abstract Water bears (Tardigrada) are known as one of the most extremophile animals in the world. They inhabit environments from the deepest parts of the oceans up to the highest mountains. One of the most extreme and still poorly studied habitats which tardigrades inhabit are cryoconite holes. We analysed the relation between area, depth, elevation and tardigrades densities in cryoconite holes on four glaciers on Spitsbergen. The mean (±SD) of cryoconite area was 1287.21±2400.8 cm2, while the depth was on average 10.8±11.2 cm, the elevation 172.6±109.66 m a.s.l., and tardigrade density 24.9±33.0 individuals per gram of wet material (n = 38). The densities of tardigrades on Hans Glacier reached values of up to 168 ind. cm3, 104 ind. g−1 wet weight, and 275 ind. g−1 dry weight. The densities of tardigrades of the three glaciers in Billefjorden were up to 82 ind. cm2, 326 ind. g−1 wet weight and 624 ind. g−1 dry weight. Surprisingly, although the model included area, depth and elevation as independent variables, it cannot explain Tardigrada density in cryoconite holes. We propose that due to the rapid melting of the glacier surface in the Arctic, the constant flushing of cryoconite sediments, and inter-hole water-sediment mixing, the functioning of these ecosystems is disrupted. We conclude that cryoconite holes are dynamic ecosystems for microinvertebrates in the Arctic.

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Gugolek, A., M. O Lorek, Z. Rotkiewicz und T. Rotkiewicz. „Effects of probiotic bacteria on the performance of arctic foxes, pathomorphology and microflora of their alimentary tracts“. Czech Journal of Animal Science 49, No. 6 (12.12.2011): 265–70. http://dx.doi.org/10.17221/4309-cjas.

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Studies on the use of Enterococcus faecium and Lactobacillus acidophilus cultures in arctic fox nutrition were performed on 80 foxes, in the period from weaning to the end of growth and fur development. Diets for the experimental animals were supplemented with 1 g of a probiotic preparation that provided the supply of each bacterial culture in the amount of 1 × 109 CFU (colony forming units) per day. The performance of the animals was estimated on the basis of their body weights, conformation and pelt quality. Histopathological examinations of the liver, kidneys and selected segments of the alimentary tract were also conducted. The results show that a mixture of Enterococcus faecium and Lactobacillus acidophilus cultures had beneficial effects on the health of artic foxes. The probiotic changed the composition of the alimentary tract microflora, which had a positive influence on the morphology of the alimentary tract mucosa and allowed to reduce morphological damage to the liver and kidneys. The good condition of foxes resulted in higher body weight gains and better parameters of conformation and pelt quality.

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Huang, Jingyin, Kasia Jankiewicz und Piotr Przytycki. „Cocompactly cubulated 2-dimensional Artin groups“. Commentarii Mathematici Helvetici 91, Nr. 3 (2016): 519–42. http://dx.doi.org/10.4171/cmh/394.

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Collins, L. E., R. Klein und D. Bai. „Development of High Strength Line Pipe for Arctic Applications“. Canadian Metallurgical Quarterly 48, Nr. 3 (September 2009): 261–70. http://dx.doi.org/10.1179/cmq.2009.48.3.261.

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Kirtsideli, Irina Yu, Dmitry Yu Vlasov, Evgeny V. Abakumov, Elena P. Barantsevich, Yuri K. Novozhilov, Viacheslav A. Krylenkov und Vladimir T. Sokolov. „Airborne fungi in arctic settlement Tiksi (Russian Arctic, coast of the Laptev Sea)“. Czech Polar Reports 7, Nr. 2 (01.06.2017): 300–310. http://dx.doi.org/10.5817/cpr2017-2-29.

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Biodiversity and number of airborne fungi isolated from indoor and outdoor air of different location in the areas of arctic settlement Tiksi (Russian Arctic) are described. Different locations (coastal areas, landscape, streets of Tiksi, abandoned empty houses, flats, public buildings) were observed. Aeromycota characterized by a significant biodiversity (50 species), but only several species were abundant. Airborne fungal spores concentration (CFU) in Tiksi locations was found low. The maximum spore concentrations were observed in air of the abandoned empty houses (inhabited in the past). Many species common for soil were observed at the samples taken at streets and abandoned buildings. Most of them are also known as inhabitants of building materials. Microfungi CFU at settlement territory was twice as high as natural territory. Phospholipase, albuminase and hemolytic activities of microfungi isolates as well as their relation to temperature were studied. Most of the tested isolates demonstrated high levels of all the tested activities. It was concluded that there is a risk of ‘‘mold’’ allergy diseases for the people especially with weakening of immunity at arctic settlement Tiksi. Main sources of the air contamination in arctic settlements and houses could be many anthropogenic substrates which were colonized by soil fungi.

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Funakura, Takeo. „On Coefficients of Artin L Functions as Dirichlet Series“. Canadian Mathematical Bulletin 33, Nr. 1 (01.03.1990): 50–54. http://dx.doi.org/10.4153/cmb-1990-008-1.

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AbstractThe paper is motivated by a result of Ankeny [1] above Dirichlet L functions in 1952. We generalize this from Dirichlet L functions to Artin L functions of relative abelian extensions, by complementing the ingenious proof of Ankeny's theorem given by Iwasaki [4]. Moreover, we characterize Dirichlet L functions in the class of all Artin L functions in terms of coefficients as Dirichlet series.

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Li, Dawei, Rong Zhang und Thomas Knutson. „Comparison of Mechanisms for Low-Frequency Variability of Summer Arctic Sea Ice in Three Coupled Models“. Journal of Climate 31, Nr. 3 (22.01.2018): 1205–26. http://dx.doi.org/10.1175/jcli-d-16-0617.1.

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Abstract In this study the mechanisms for low-frequency variability of summer Arctic sea ice are analyzed using long control simulations from three coupled models (GFDL CM2.1, GFDL CM3, and NCAR CESM). Despite different Arctic sea ice mean states, there are many robust features in the response of low-frequency summer Arctic sea ice variability to the three key predictors (Atlantic and Pacific oceanic heat transport into the Arctic and the Arctic dipole) across all three models. In all three models, an enhanced Atlantic (Pacific) heat transport into the Arctic induces summer Arctic sea ice decline and surface warming, especially over the Atlantic (Pacific) sector of the Arctic. A positive phase of the Arctic dipole induces summer Arctic sea ice decline and surface warming on the Pacific side, and opposite changes on the Atlantic side. There is robust Bjerknes compensation at low frequency, so the northward atmospheric heat transport provides a negative feedback to summer Arctic sea ice variations. The influence of the Arctic dipole on summer Arctic sea ice extent is more (less) effective in simulations with less (excessive) climatological summer sea ice in the Atlantic sector. The response of Arctic sea ice thickness to the three key predictors is stronger in models that have thicker climatological Arctic sea ice.

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Ritchie, J. C., K. A. Hadden und K. Gajewski. „Modern pollen spectra from lakes in arctic western Canada“. Canadian Journal of Botany 65, Nr. 8 (01.08.1987): 1605–13. http://dx.doi.org/10.1139/b87-220.

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Fifty-four samples of modern sediment from Banks Island and the Melville–Horton region of the Northwest Territories illustrate the major features of pollen deposition from the high to low arctic. Modern pollen deposition in the high arctic of Banks Island is characterized by up to 14% windblown tree pollen. Indicator taxa of the high and mid arctic include Oxyria (<5–23%), Saxifragaceae, Saxifraga oppositifolia, and Cruciferae (all up to 8%) and Dryas (up to 3%). Arboreal pollen increases to 60% in low-arctic and subarctic samples. Pollen concentration decreases from between 3 500 and 20 000 in the low arctic to less than 5 000 grains/cm3 in the high and mid arctic. Pollen spectra from the Late Glacial of northwestern Canada differ from those of the modern high and mid arctic not only by the absence of trees and shrubs but also in the relative proportions of Artemisia and of such indicator taxa as Oxyria and Saxifragaceae.

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Perlis, Robert. „On the Analytic Determination of the Trace Form“. Canadian Mathematical Bulletin 28, Nr. 4 (01.12.1985): 422–30. http://dx.doi.org/10.4153/cmb-1985-051-2.

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AbstractThe Dedekind zeta function of an algebraic number field E determines the rational equivalence class of the trace form of E. The Hasse symbols of the trace form are related to the local Artin root numbers of the zeta function by formulas of Serre and Deligne. This is used to settle the question of which families of complex numbers appear as the local Artin root numbers of a continuous real representation of the absolute Galois group of ℚ.

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Dissertationen zum Thema "CMU Artic"

Näslund, Anton, und Charlie Jeansson. „Robust Speech Activity Detection and Direction of Arrival Using Convolutional Neural Networks“. Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297756.

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Social robots are becoming more and more common in our everyday lives. In the field of conversational robotics, the development goes towards socially engaging robots with humanlike conversation. This project looked into one of the technical aspects when recognizing speech, videlicet speech activity detection (SAD). The presented solution uses a convolutional neural network (CNN) based system to detect speech in a forward azimuth area. The project used a dataset from FestVox, called CMU Artic and was complimented by adding recorded noises. A library called Pyroomacoustics were used to simulate a real world setup to create a robust system. A simplified version was built, this model only detected speech activity and a accuracy of 95%was reached. The finished model resulted in an accuracy of 93%.It was compared with similar project, a voice activity detection(VAD) algorithm WebRTC with beamforming, as no previous published solutions to our project was found. Our solution proved to be higher in accuracy in both cases, compared to the accuracy WebRTC achieved on our dataset.
Sociala robotar blir vanligare och vanligare i våra vardagliga liv. Inom konversationsrobotik går utvecklingen mot socialt engagerande robotar som kan ha mänskliga konversationer. Detta projekt tittar på en av de tekniska aspekterna vid taligenkänning, nämligen talaktivitets detektion. Den presenterade lösningen använder ett convolutional neuralt nätverks(CNN) baserat system för att detektera tal i ett framåtriktat azimut område. Projektet använde sig av ett dataset från FestVox, kallat CMU Artic och kompletterades genom att lägga till ett antal inspelade störningsljud. Ett bibliotek som heter Pyroomacoustics användes för att simulera en verklig miljö för att skapa ett robust system. En förenklad modell konstruerades som endast detekterade talaktivitet och en noggrannhet på 95% uppnåddes. Den färdiga maskinen resulterade i en noggrannhet på 93%. Det jämfördes med liknande projekt, en röstaktivitetsdetekterings (VAD) algoritm WebRTC med strålformning, eftersom inga tidigare publicerade lösningar för vårt projekt hittades. Det visade sig att våra lösningar hade högre noggrannhet än den WebRTC uppnådde på vårt dataset.
Kandidatexjobb i elektroteknik 2020, KTH, Stockholm

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Buchteile zum Thema "CMU Artic"

Grenoble, Lenore A. „Language vitality and revitalization in the Arctic“. In Culture and Language Use, 65–92. Amsterdam: John Benjamins Publishing Company, 2010. http://dx.doi.org/10.1075/clu.1.05gre.

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Gomez, Elizabeth Avery, Dezhi Wu, Katia Passerini und Michael Bieber. „Utilizing Web Tools for Computer-Mediated Communication to Enhance Team-Based Learning“. In E-Collaboration, 425–39. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-652-5.ch034.

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Team-based learning is an active learning instructional strategy used in the traditional face-to-face classroom. Web-based computer-mediated communication (CMC) tools complement the face-to-face classroom and enable active learning between face-to-face class times. This arti-cle presents the results from pilot assessments of computer-supported team-based learning. The authors utilized pedagogical approaches grounded in collaborative learning techniques, such as team-based learning, and extended these techniques to a Web-based environment through the use of computer-mediated communications tools (discussion Web-boards). This approach was examined through field studies in the course of two semesters at a US public technological university. The findings indicate that the perceptions of team learning experience such as per-ceived motivation, enjoyment, and learning in such a Web-based CMC environment are higher than in traditional face-to-face courses. In addition, our results show that perceived team mem-bers’ contributions impact individual learning experiences. Overall, Web-based CMC tools are found to effectively facilitate team interactions and achieve higher-level learning.

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Maslin, Mark. „3. Evidence for climate change“. In Climate Change: A Very Short Introduction, 29–45. Oxford University Press, 2014. http://dx.doi.org/10.1093/actrade/9780198719045.003.0003.

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‘Evidence for climate change’ considers both past and recent climate change through changes in temperature, precipitation, and relative global sea level to show that significant changes in climate have been recorded. These include a 0.85°Celsius (C) increase in average global temperatures over the last 150 years, sea-level rise of over 20 cm, significant shifts in the seasonality and intensities of precipitation, changing weather patterns, and significant retreat of Arctic sea ice and nearly all continental glaciers. The IPCC 2013 report states that the evidence for global warming is unequivocal and that there is very high confidence that this warming is due to human emissions of greenhouse gases.

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„Grenadiers of the World Oceans: Biology, Stock Assessment, and Fisheries“. In Grenadiers of the World Oceans: Biology, Stock Assessment, and Fisheries, herausgegeben von N. J. King und I. G. Priede. American Fisheries Society, 2008. http://dx.doi.org/10.47886/9781934874004.ch11.

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Abstract.—The abyssal grenadier Coryphaenoides armatus (Hector 1875), family Macrouridae, is a benthopelagic deep-sea species with a depth range of 282–5,180 m, with most observations and captures at depths of 2,500 m and deeper. It is one of the most abundant grenadier species in the world’s oceans but is absent from the Mediterranean Sea, Arctic Ocean, Indian Ocean north of 45°S, and has not yet been recorded from the Southern Ocean south of the Antarctic Polar Front. Typical total lengths range from 20 to 80 cm and the maximum recorded is 102 cm. Dietary items include mesopelagic fishes and cephalopods, and benthic items such as crustaceans and bivalves. The abyssal grenadier is well documented as an opportunistic scavenger and this propensity has been used to attract individuals to bait within view of submersibles and underwater camera systems to make in situ observations of behavior. Baited cameras have been in use to observe deep-sea scavengers since the late 1960s, with the first confirmed observation of the abyssal grenadier in 1971. More recently, baited photographic autonomous landers have been used to gain data on respiration rates, size frequency, and swimming velocity. In addition, models have been developed and refined to estimate local densities and to quantify the number of fish present at a food fall and their staying time at bait. This ultimately means that baited-camera-derived abundance estimates can be produced, and that the numbers of scavenging grenadiers and how long they remain at a small food fall can be linked to the productivity of the overlying surface waters.

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Konferenzberichte zum Thema "CMU Artic"

Rangel-Rami´rez, Jose´ G., und John D. So̸rensen. „Maintenance Planning of Offshore Wind Turbine Using Condition Monitoring Information“. In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79159.

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Deterioration processes such as fatigue and corrosion are typically affecting offshore structures. To “control” this deterioration, inspection and maintenance activities are developed. Probabilistic methodologies represent an important tool to identify the suitable strategy to inspect and control the deterioration in structures such as offshore wind turbines (OWT). Besides these methods, the integration of condition monitoring information (CMI) can optimize the mitigation activities as an updating tool. In this paper, a framework for risk-based inspection and maintenance planning (RBI) is applied for OWT incorporating CMI, addressing this analysis to fatigue prone details in welded steel joints at jacket or tripod steel support structures for offshore wind turbines. The increase of turbulence in wind farms is taken into account by using a code-based turbulence model. Further, additional modes t integrate CMI in the RBI approach for optimal planning of inspection and maintenance. As part of the results, the life cycle reliabilities and inspection times are calculated, showing that earlier inspections are needed at in-wind farm sites. This is expected due to the wake turbulence increasing the wind load. With the integration of CMI by means Bayesian inference, a slightly change of first inspection times are coming up, influenced by the reduction of the uncertainty and harsher or milder external agents.

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Mintu, Shafiul A., und David Molyneux. „Application of GPGPU to Accelerate CFD Simulation“. In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77649.

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Computational Fluid Dynamics (CFD) is widely used in industry and academic research to investigate complex fluid flow. The bottleneck of a realistic CFD simulation is its long simulation time. The simulation time is generally reduced by massively parallel Central Processing Unit (CPU) clusters, which are very expensive. In this paper, it is shown that the CFD simulation can be accelerated significantly by a novel hardware called General Purpose Computing on Graphical Processing Units (GPGPU). GPGPU is a cost-effective computing cluster, which uses the Compute Unified Device Architecture (CUDA) of NVIDIA devices to transform the GPU into a massively parallel processor. The paper demonstrates the faster computing ability of GPU compared to a traditional multi-core CPU. Two scenarios are simulated; one is a 2-dimensional simulation of regular wave and another one is a 3-dimensional motion of a floating ship on a regular wave. A smoothed particle hydrodynamics (SPH) based CFD solver is used for simulating the complex free-surface flow. The performance of a single GPU is compared against a commonly used 16 core CPU. For a large simulation of 6 degrees of freedom (DOF) ship motion simulation, the comparative study exhibits a speedup of more than an order of magnitude, reducing simulation time from 30 hours to about 2 hours. This indicates a CUDA enabled GPU card can be used as a cost-effective computing tool for a reliable and accurate SPH-based CFD simulation. The cost-benefit analysis of GPU over a CPU cluster is also discussed.

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Pampuch, Luana, Raquel Nieto, Luis Gimeno, Tércio Ambrizzi und Marta Vázquez. „Analysis of Changes on Moisture Sources Contributions for Arctic Region in a FutureClimate Scenario Using GFDL/CM3 Model“. In The 1st International Electronic Conference on Atmospheric Sciences. Basel, Switzerland: MDPI, 2016. http://dx.doi.org/10.3390/ecas2016-a007.

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Waseda, Takuji, Takehiko Nose und Adrean Webb. „Comparison of the Long-Term Trends of the Largest Waves in the Ice-Free Arctic Waters From Different Reanalysis Products“. In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77971.

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The long-term trends of the expected largest waves in the ice-free Arctic waters from Laptev to Beaufort Seas was studied analyzing the ERA-interim reanalysis from 1979 to 2016. The analysis showed that the positive trend is largest in October and increased almost 70 cm in 38 years. For ships navigating the Northern Ship Route, it is important to know what the possible largest waves to expect during its cruise. In view of conducting the extreme value analysis, the uncertainty of the largest wave needs to be validated. However, the observation in the Arctic Ocean is limited. We, therefore, rely on the reanalysis wave products in the Arctic Ocean, whose uncertainty is yet to be determined. ERA-Interim and ERA-5 are compared in the Laptev, the East Siberian, Chukchi and Beaufort Seas. The comparison is relevant as the two products differ in its horizontal grid resolution and availability of the satellite altimeter significant wave height data assimilation. During 2010–2016 when the ERA5 is available, only a small difference from ERA-Interim was detected in the mean. However, the expected largest waves in the domain tended to be large for the ERA-5, 8% normalized bias. The tendency was quite similar with a high correlation of 0.98.

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Alvi, Muhammad Awais Ashfaq, Mesfin Belayneh, Arild Saasen, Kjell Kåre Fjelde und Bernt S. Aadnøy. „Effect of MWCNT and MWCNT Functionalized -OH and -COOH Nanoparticles in Laboratory Water Based Drilling Fluid“. In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78702.

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In recent years, the application of nanomaterial has been attracting the oil and gas industry. Nanomaterials research results show an improving performance of cement, drilling fluid and enhanced oil recovery. In this paper, the effect of multi-walled carbon nanotube (MWCNT) and MWCNT functionalized with ligands–OH and - COOH nanoparticles on laboratory drilling fluids formulated from bentonite, KCL, Carboxymethyl cellulose (CMC) and xanthan gum (XG) was studied. The formulations and tests were performed at room temperature. The results show that addition of 0.0095wt.% of MWCNT, MWCNT-OH and MWCNT-COOH nanoparticles in CMC/bentonite system decreases the filtrate-loss by 8.6 %, 7.1 % and 17.9 % respectively. These particles also decreased the coefficient of friction by 34 %, 37 % and 33 % respectively. In xanthan gum drilling fluid, 0.019wt%. MWCNT reduced the friction coefficient by 38 %.

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Belayneh, Mesfin, und Bernt S. Aadnøy. „Effect of Nano-Silicon Dioxide (SiO2) on Polymer/Salt Treated Bentonite Drilling Fluid Systems“. In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54450.

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Recently the application of nanomaterial is attracting the oil and gas industry. The preliminary nanomaterials research results show an improving performance of cement, drilling fluid and Enhanced Oil Recovery. In this paper, the effect of nano Silicon dioxide (SiO2) on polymer (HV-CMC, Xanthan gum, LV-CMC) and salt (KCl, NaCl) treated bentonite drilling fluid systems has been studied at room temperature. The results show that the performance of nano SiO2 in bentonite mud system depends on its concentration and the types of salt and polymer systems used. In the considered fluid systems, it is also observed that the addition of about 0.06% SiO2 influences rheology, and filtrate loss of the drilling fluid systems. The viscoelasticity of the selected best system further studied and their hole -cleaning and hydraulics performances are simulated. The overall result shows that the formulated optimum concentration of nano-system shows good performances and rheological behavior.

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Ikoma, Tomoki, Koichi Masuda, Hisaaki Maeda und Sayaka Hanazawa. „Behaviors of Drag and Inertia Coefficients of Circular Cylinders Under Vortex-Induced Vibrations With Forced Oscillation Tests in Still Water“. In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29473.

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This paper describes the drag coefficient and the inertia coefficient on rigid circular cylinders under oscillating flows. And also VIV behavior of tubing is investigated by using horizontal orbit patterns of test models including effect of VIV. Rigid circular cylinders are used for the model experiment. The test models are suspended into still water through a flat spring, and hence VIV is observed found with hydroelasticity in spite of a rigid circular cylinder. This is a forced oscillation test in still water. The circular cylinders for the model test have drafts of 30 cm, 60 cm and 80 cm, and diameter of 5 cm and 8 cm. The models are oscillated with periods of 0.5 s to 4.6 s and with about 7 cm amplitude of the oscillation. Model tests of forced oscillation are carried out under transverse motion (VIV) fixed conditions because VIV effects are investigated to the drag and the inertia coefficients. It is shown that the drag coefficient increases and the inertia coefficient decreases when larger VIV response occurs under forced oscillation in an inline direction.

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Monroy, Charles, Guillaume de Hauteclocque und Xiao-Bo Chen. „Systematic Accuracy Assessment of Two Frequently Used QTF Approximations in the Case of a Rectangular Barge“. In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24600.

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This paper presents numerical results of the monodirectional second order forces acting on a rudimentory FPSO hull shape. The exact calculation of second order loads through potential theory is computationally challenging and requires the evaluation of a slowly-convergent free surface integral. In practice, this integral is often neglected as it is widely assumed that it does not contribute significantly to the overall load and few commercial seakeeping software propose this option anyway. An even rougher and widely used approximation consists in expressing the second order loads occuring at a non-zero difference frequency from the mean drift loads. It is called the Newman’s approximation; it enables serious CPU time gains, but at the cost of a worse accuracy. The object of this paper is to investigate on a simple case the accuracy of each of these two approximations (without the free surface integral and Newman’s approximation) and the influence of parameters such as the water depth and the sea state wave length. Depending on the resonant period of the considered mooring system, it may give some insight on a good compromise between CPU time and accuracy when choosing the way of determing the second order loads.

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Fu, Thomas C., Thomas T. O’Shea, Kyle A. Brucker, Carolyn Q. Judge, Christine M. Ikeda, Donald C. Wyatt und Douglas G. Dommermuth. „Numerical Simulation of Short Duration Hydrodynamic Impact“. In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24323.

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Numerical simulations of wedge impact experiments, undertaken by the Naval Surface Warfare Center, Carderock Division, NSWCCD, and more recently by the United States Naval Academy, USNA, Hydromechanics Laboratory, were performed using the computational fluid dynamics code Numerical Flow Analysis, NFA, to assess its capabilities in simulating the short duration hydrodynamic loading associated with free-surface impact. NSWCCD performed experiments using drop heights of 15.24 cm (6 in) and 25.4 cm (10 in), while the Naval Academy used drop heights of: 7.94, 12.7, 15.88, 25.4, 31.75, 38.1, and 50.8 cm (3.125, 5.0, 6.25, 10.0, 12.5, 15.0, and 20.0 in), measured from the keel of the wedge to the calm water surface. Simulations and comparisons were made at heights of 15.24 cm (6 in) and 25.4 cm (10 in) with the NSWCCD data, and 12.5 inches for the USNA data providing for a detailed examination of NFA’s ability to simulate and predict short duration hydrodynamic impacts.

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Kim, Ho Jung, Sung Won Kang, Jae Myung Lee und Myung Hyun Kim. „Fatigue Strength Assessment for High Strength Steel Welded Joints“. In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20909.

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The aim of the present paper is to investigate and to compare the fatigue characteristics of butt welded joints made of high strength steel with tensile strength 700MPa. The influence of different back plate materials and the groove shapes of copper backing are investigated. Various backing methods have been used in the steel construction industries, but steel backing, which is the most frequently used, sometimes is not capable of providing sufficient fatigue strengths for welded joint, particularly for high strength steel. Therefore, alternative backing methods have been investigated in order to improve the fatigue strength by employing ceramic backing, CMT (Cold Metal Transfer) [1] and copper backing. The main objective of the work is to estimate the fatigue test results for improving fatigue strength by comparing different backing materials and groove shapes. A series of fatigue tests with different types of backings has been carried out to obtain the fatigue life of butt welded joints. It was observed that the fatigue behavior of welded joints can be substantially improved by changing back bead shapes. The result has shown that the back bead shape of copper backing is better than others except for that of CMT, accompanied by improved fatigue strength.

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Berichte der Organisationen zum Thema "CMU Artic"

Douglas, Thomas, Merritt Turetsky und Charles Koven. Increased rainfall stimulates permafrost thaw across a variety of Interior Alaskan boreal ecosystems. Engineer Research and Development Center (U.S.), Juni 2021. http://dx.doi.org/10.21079/11681/41050.

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Earth’s high latitudes are projected to experience warmer and wetter summers in the future but ramifications for soil thermal processes and permafrost thaw are poorly understood. Here we present 2750 end of summer thaw depths representing a range of vegetation characteristics in Interior Alaska measured over a 5-year period. This included the top and third wettest summers in the 91-year record and three summers with precipitation close to mean historical values. Increased rainfall led to deeper thaw across all sites with an increase of 0.7 ± 0.1 cm of thaw per cm of additional rain. Disturbed and wetland sites were the most vulnerable to rain-induced thaw with ~1 cm of surface thaw per additional 1 cm of rain. Permafrost in tussock tundra, mixed forest, and conifer forest was less sensitive to rain-induced thaw. A simple energy budget model yields seasonal thaw values smaller than the linear regression of our measurements but provides a first-order estimate of the role of rain-driven sensible heat fluxes in high-latitude terrestrial permafrost. This study demonstrates substantial permafrost thaw from the projected increasing summer precipitation across most of the Arctic region.

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Saumur, B. M., M. C. Williamson, J. H. Bédard, K. Dewing und C A Evenchick. GEM-2: multiscale architecture and Ni-Cu-PGE prospectivity of the High Arctic large igneous province (HALIP). Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/305827.

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Saumur, B. M. Ni-Cu-PGE prospectivity of the HALIP, Canadian Arctic Islands: field-based evidence of structural controls on intrusive style. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/300711.

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Jefferson, C. W., L. J. Hulbert, R. H. Rainbird, G. E. M. Hall, D C Grégoire und L. I. Grinenko. Mineral resource assessment of the Neoproterozoic Franklin Igneous Events of Arctic Canada: comparison with the Permo-Triassic Noril'sk-Talnakh Ni-Cu-PGE deposits of Russia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/193362.

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