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Literatura académica sobre el tema "Uplift Rates"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 14 de febrero de 2022

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Artículos de revistas sobre el tema "Uplift Rates"

Palyvos, N., D. Sorel, F. Lemeille, M. Mancini, D. Pantosti, R. Julia, M. Triantaphyllou y P. M. De Martini. "REVIEW AND NEW DATA ON UPLIFT RATES AT THE W TERMINATION OF THE CORINTH RIFT AND THE NE RION GRABEN AREA (ACHAIA, NW PELOPONNESOS)". Bulletin of the Geological Society of Greece 40, n.º 1 (8 de junio de 2018): 412. http://dx.doi.org/10.12681/bgsg.16631.

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We review and present new geochronological data on the uplifted Middle-Late Pleistocene marine deposits at the western termination of the Corinth Rift and the Rion area. Geomorphological and geological observations define the general morphotectonic context of these deposits, which predicts a pattern of differential uplift. Uplift rate estimates based on previous geochronological data (ranging from 0.4 to 6 mm/yr) are discussed in the proposed morphotectonic context of differential uplift, together with estimates from new geochronological data. Based on the data available for post-MISl 1 marine deposits, we conclude that time-averaged uplift rates in the last 300-200 lea have been higher than ca. 1.8 mm/yr at the areas of faster uplift (e.g. Profus Elias, Ano Kastritsi). To define just how higher than 1.8 mm/yr they have been, and to cross-check the validity of very high uplift rate estimates (> 4 mm/yr) existing in the bibliography, more datings than those available are required.

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WARD, C. M. "New Zealand Marine Terraces: Uplift Rates". Science 240, n.º 4853 (6 de mayo de 1988): 803–4. http://dx.doi.org/10.1126/science.240.4853.803.

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BULL, W. B. y A. F. COOPER. "Response:New Zealand Marine Terraces: Uplift Rates". Science 240, n.º 4853 (6 de mayo de 1988): 804–5. http://dx.doi.org/10.1126/science.240.4853.804.

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SHARMA, R. K. "Response:New Zealand Marine Terraces: Uplift Rates". Science 240, n.º 4853 (6 de mayo de 1988): 805–6. http://dx.doi.org/10.1126/science.240.4853.805-a.

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Pallikarakis, Aggelos, Ioannis Papanikolaou, Klaus Reicherter, Maria Triantaphyllou, Margarita Dimiza y Olga Koukousioura. "Constraining the regional uplift rate of the Corinth Isthmus area (Greece), through biostratigraphic and tectonic data". Zeitschrift für Geomorphologie, Supplementary Issues 62, n.º 2 (1 de octubre de 2019): 127–42. http://dx.doi.org/10.1127/zfg_suppl/2019/0609.

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The eastern Corinth Gulf is constantly uplifted at least since Middle Pleistocene. This uplift is the combined result of the regional uplift and the activity of major active faults which influence the area. These tectonic movements which control the sedimentation processes of the study area resulted in a complex stratigraphy, paleogeography and paleoenvironment of the Corinth Isthmus. Stratigraphy supported with nannofossil biozonation data, demonstrates that marine sedimentation processes occurred during MIS 7 and MIS 5, providing some important constraints regarding the uplift rate of the area. An 0.22 ± 0.12 mm/yr uplift rate is extracted through nannofossils biozonation which is in agreement with published data from U/Th coral dating in a neighboring setting, adding confidence to the measured uplift rates. In order to constrain the regional uplift of the area, the influence of the surrounding active faults has been extracted. The latter has been implemented by extracting the influence of each individual active fault to the study site (using the fault geometry, fault slip-rates, the fault dip and the fault footwall uplift/ hangingwall subsidence ratio), in order to calculate the regional uplift rate. By considering the stratigra- phy and the biostratigraphy of the eastern part of the Corinth Isthmus and by extracting the influence of the active faults, a~0.34 ± 0.04 mm/yr regional uplift is calculated.

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Dickinson, William R. "Control of paleoshorelines by trench forebulge uplift, Loyalty Islands". Quaternary Research 80, n.º 1 (julio de 2013): 125–37. http://dx.doi.org/10.1016/j.yqres.2013.04.007.

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Unlike most tropical Pacific islands, which lie along island arcs or hotspot chains, the Loyalty Islands between New Caledonia and Vanuatu owe their existence and morphology to the uplift of pre-existing atolls on the flexural forebulge of the New Hebrides Trench. The configuration and topography of each island is a function of distance from the crest of the uplifted forebulge. Both Maré and Lifou are fully emergent paleoatolls upon which ancient barrier reefs form highstanding annular ridges that enclose interior plateaus representing paleolagoon floors, whereas the partially emergent Ouveapaleoatoll rim flanks a drowned remnant lagoon. Emergent paleoshoreline features exposed by island uplift include paleoreef flats constructed as ancient fringing reefs built to past low tide levels and emergent tidal notches incised at past high tide levels. Present paleoshoreline elevations record uplift rates of the islands since last-interglacial and mid-Holocene highstands in global and regional sea levels, respectively, and paleoreef stratigraphy reflects net Quaternary island emergence. The empirical uplift rates vary in harmony with theoretical uplift rates inferred from the different positions of the islands in transit across the trench forebulge at the trench subduction rate. The Loyalty Islands provide a case study of island environments controlled primarily by neotectonics.

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Ebashi, Takeshi, Makoto Kawamura, Manabu Inagaki, Shigeru Koo, Masahiro Shibata, Toru Itazu, Kunihiko Nakajima, Kaname Miyahara y Michael J. Apted. "“Relative Rates Method” for Evaluating the Effect of Potential Geological Environmental Change due to Uplift/Erosion to Radionuclide Migration of High-level Radioactive Waste". MRS Proceedings 1665 (2014): 39–45. http://dx.doi.org/10.1557/opl.2014.626.

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ABSTRACTWe have developed a “Relative Rates Method” to make bounding calculations regarding radionuclide migration due to uplift/erosion (“exhumation”) of a HLW repository. Results show that this method can apply to a wide range of different uplift rates and erosion rates. In addition, for the long time period, it was shown that the relative difference of uplift rate / erosion rate and potential hydraulic change arising from extreme uplift/erosion could affect radionuclide release and migration, thus uplift/erosion concerns should be fed back to site selection. Our method provides a credible and defensible basis for analysis and interpretation of possible uplift/erosion impacts for future volunteer sites.

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Engel, John, Jon Woodhead, John Hellstrom, Susan White, Nicholas White y Helen Green. "Using speleothems to constrain late Cenozoic uplift rates in karst terranes". Geology 48, n.º 8 (29 de abril de 2020): 755–60. http://dx.doi.org/10.1130/g47466.1.

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Abstract The utility of speleothems as environmental and geological archives has greatly expanded with recent advances in geochronology. Here we reevaluate their ability to constrain late Cenozoic uplift in karst terranes. Using combined U-Th and U-Pb speleothem chronologies for the Buchan karst along the passive margin of southeastern Australia, we calculate a maximum uplift rate of 76 ± 7 m m.y.−1 maintained over the past 3.5 m.y. The timing and extent of this process is consistent with independent constraints on Neogene uplift in Australia, possibly in response to increased plate-boundary strain with New Zealand. Speleothem chronologies provide highly precise age control on individual events and the potential for near-continuous records across long periods of geological time, complementing and expanding upon existing uplift proxies.

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Bowen, D. Q. "Sea level 400 000 years ago (MIS 11): analogue for present and future sea-level". Climate of the Past Discussions 5, n.º 4 (13 de julio de 2009): 1853–82. http://dx.doi.org/10.5194/cpd-5-1853-2009.

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Abstract. Comparison of sea-levels today and 400 000 years ago (MIS 11), when the Earth's orbital characteristics were similar, may provide indications of future sea-level during the present interglacial. Evidence for former sea-levels occur on uplifting coastlines where shorelines are preserved. The sea-level term and the uplift term may be separated with an "uplift uplift correction" formula. This discovers the original sea-level at which the uplifted shoreline was fashioned. Estimates are based on average uplift rates of the "last interglacial" sea-level (MIS 5.5) using a range estimates for sea-level and age at that time and at different locations. These, with varying secular tectonic regimes in different ocean basins, provide a band of estimates for MIS 11. They show the MIS 11 sea-level was close to its present level and Greenland and West Antarctic ice volumes were similar to present.

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Westaway, R. "Long-term river terrace sequences: Evidence for global increases in surface uplift rates in the Late Pliocene and early Middle Pleistocene caused by flow in the lower continental crust induced by surface processes". Netherlands Journal of Geosciences - Geologie en Mijnbouw 81, n.º 3-4 (diciembre de 2002): 305–28. http://dx.doi.org/10.1017/s0016774600022629.

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AbstractLong-term river terrace sequences reveal that many regions have uplifted by several hundred metres since the Middle Pliocene. They indeed provide evidence of a global increase in uplift rates in die Late Pliocene, followed by a calm period then a renewed increase around the Early-Middle Pleistocene boundary. It is suggested that this uplift pattern has resulted from thickening of the continental crust caused by flow in the lower crust which has been induced by cyclic surface loading caused by growth and decay of ice sheets and the associated global sea-level fluctuations. Observed uplift histories are modelled using a technique which incorporates increases in the strength of forcing of this process caused by step changes in the intensity of glaciations starting at~3.1,~2.5,~1.2, and~0.9 Ma.

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Tesis sobre el tema "Uplift Rates"

Stefer, Susanne. "Late Pleistocene-Holocene sedimentary processes at the active margin of South-Central Chile : marine and lacustrine sediment records as archives of tectonics and climate variability". Phd thesis, Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2009/3373/.

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Active continental margins are affected by complex feedbacks between tectonic, climate and surface processes, the intricate relations of which are still a matter of discussion. The Chilean convergent margin, forming the outstanding Andean subduction orogen, constitutes an ideal natural laboratory for the investigation of climate, tectonics and their interactions. In order to study both processes, I examined marine and lacustrine sediments from different depositional environments on- and offshore the south-central Chilean coast (38-40°S). I combined sedimentological, geochemical and isotopical analyses to identify climatic and tectonic signals within the sedimentary records. The investigation of marine trench sediments (ODP Site 1232, SONNE core 50SL) focused on frequency changes of turbiditic event layers since the late Pleistocene. In the active margin setting of south-central Chile, these layers were considered to reflect periodically occurring earthquakes and to constitute an archive of the regional paleoseismicity. The new results indicate glacial-interglacial changes in turbidite frequencies during the last 140 kyr, with short recurrence times (~200 years) during glacial and long recurrence times (~1000 years) during interglacial periods. Hence, the generation of turbidites appears to be strongly influenced by climate and sea level changes, which control on the amount of sediment delivered to the shelf edge and therewith the stability of the continental slope: more stable slope conditions during interglacial periods entail lower turbidite frequencies than in glacial periods. Since glacial turbidite recurrence times are congruent with earthquake recurrence times derived from the historical record and other paleoseismic archives of the region, I concluded that only during cold stages the sediment availability and slope instability enabled the complete series of large earthquakes to be recorded. The sediment transport to the shelf region is not only driven by climate conditions but also influenced by local forearc tectonics. Accelerating uplift rates along major tectonic structures involved drainage anomalies and river flow inversions, which seriously altered the sediment supply to the Pacific Ocean. Two examples for the tectonic hindrance of fluvial systems are the coastal lakes Lago Lanalhue and Lago Lleu Lleu. Both lakes developed within former river valleys, which once discharged towards the Pacific and were dammed by tectonically uplifted sills at ~8000 yr BP. Analyses of sediment cores from the lakes showed similar successions of marine/brackish deposits at the bottom, covered by lacustrine sediments on top. Dating of the transitions between these different units and the comparison with global sea level curves allowed me to calculate local Holocene uplift rates, which are distinctly higher for the upraised sills (Lanalhue: 8.83 ± 2.7 mm/yr, Lleu Lleu: 11.36 ± 1.77 mm/yr) than for the lake basins (Lanalhue: 0.42 ± 0.71 mm/yr, Lleu Lleu: 0.49 ± 0.44 mm/yr). I hence considered the sills to be the surface expression of a blind thrust associated with a prominent inverse fault that is controlling regional uplift and folding. After the final separation of Lago Lanalhue and Lago Lleu Lleu from the Pacific, a constant deposition of lacustrine sediments preserved continuous records of local environmental changes. Sequences from both lakes indicate a long-term climate trend with a significant shift from more arid conditions during the Mid-Holocene (8000 – 4200 cal yr BP) to more humid conditions during the Late Holocene (4200 cal yr BP – present). This trend is consistent with other regional paleoclimatic data and interpreted to reflect changes in the strength/position of the Southern Westerly Winds. Since ~5000 years, sediments of Lago Lleu Lleu are marked by numerous intercalated detrital layers that recur with a mean frequency of ~210 years. Deposition of these layers may be triggered by local tectonics (i.e. earthquakes), but may also originate from changes in the local climate (e.g. onset of modern ENSO conditions). During the last 2000 years, pronounced variations in the terrigenous sediment supply to both lakes suggest important hydrological changes on the centennial time-scale as well. A lower input of terrigenous matter points to less humid phases between 200 cal yr B.C. - 150 cal yr A.D., 900 - 1350 cal yr A.D. and 1850 cal yr A.D. to present (broadly corresponding to the Roman, Medieval, and Modern Warm Periods). More humid periods persisted from 150 - 900 cal yr A.D. and 1350 - 1850 cal yr A.D. (broadly corresponding to the Dark Ages and the Little Ice Age). In conclusion, the combined investigation of marine and lacustrine sediments is a feasible method for the reconstruction of climatic and tectonic processes on different time scales. My approach allows exploring both climate and tectonics in one and the same archive, and is largely transferable to other active margins worldwide.
An aktiven Kontinentalrändern wirken komplexe Rückkopplungen zwischen Tektonik, Klima- und Oberflächenprozessen, deren Zusammenhänge bisher nur in Grundzügen verstanden und Gegenstand aktueller Forschung sind. Der chilenische Kontinentalrand – mit den Anden als größtem Subduktionsorogen der Erde – bietet ein natürliches Labor zur Erforschung von Klima und Tektonik sowie deren Wechselbeziehungen. Um beide Prozesse genauer zu verifizieren, habe ich marine und lakustrine Sedimente entlang der südlichen Küste Zentralchiles (38-40°S) untersucht und die enthaltenen klimatischen und tektonischen Signale mit einer Kombination aus sedimentologischen, geochemischen und Isotopen-Analysen identifiziert. Die Untersuchung der marinen Trenchsedimente (ODP-Bohrung 1232, SONNE-Kern 50SL) konzentriert sich dabei auf Änderungen in der Ablagerungsfrequenz von turbiditischen Lagen, welche in der tektonisch aktiven Region süd-zentral Chiles als Anzeiger periodisch auftretender Erdbeben und somit als Archiv lokaler Seismizität gewertet werden. Für die letzten 140 000 Jahre zeigen die Daten deutliche Schwankungen der Turbiditfrequenzen: Während in Glazialzeiten in etwa ein Ereignis alle 200 Jahre zu verzeichnen ist, treten Turbidite in den Interglazialzeiten nur etwa alle 1000 Jahre auf. Die Häufigkeit der Turbidite scheint demnach nicht nur von der lokalen Seismizität, sondern auch von globalen Klima- und Meeresspiegelschwankungen abhängig zu sein. Beide bestimmen die Sedimentmenge, die den Kontinentalschelf und die Schelfkante erreicht, und damit letztendlich die Stabilität des Kontinentalhanges; so führen stabilere Hangverhältnisse in den Interglazialen zu geringeren Turbiditfrequenzen als in den Glazialen. Da die glazialen Turbidithäufigkeiten gut mit der Häufigkeit von historisch dokumentierten Erdebeben übereinstimmen, scheint in Abhängigkeit der größeren Sedimentmenge und der geringeren Hangstabilität nur in den Kaltzeiten die Gesamtzahl aller großen Erbeben durch Turbidite aufgezeichnet zu werden. Neben dem Klima bestimmt auch die lokale Forearc-Tektonik den Sedimenttransport zur Schelfregion. Erhöhte Hebung entlang tektonischer Strukturen kann zu Veränderungen im Gewässernetz führen und so die Sedimentzufuhr zum Pazifik modifizieren oder gar unterbinden. Zwei Beispiele für die tektonische Blockade von Flusssystemen entlang von Störungszonen sind die heutigen Küstenseen Lago Lanalhue und Lago Lleu Lleu. Beide Seen entwickelten sich aus ehemaligen Flusssystemen, die einst zum Pazifik hin entwässerten und vor etwa 8000 Jahren durch lokale tektonische Hebung entlang einer inversen Verwerfung aufgestaut wurden. Sedimentkernanalysen zeigen für beide Seen eine ähnliche Abfolge von zunächst marinem und darüber liegendem lakustrinen Material. Die genaue Datierung des marin-lakustrinen Übergangs und der Vergleich mit globalen Meeresspiegelkurven erlaubt die Berechnung lokaler holozäner Hebungsraten. Für die Schwellen, die beide Seen eindämmen, sind diese Raten deutlich höher (Lanalhue: 8.83 ± 2.7 mm/Jahr; Lleu Lleu: 11.36 ± 1.77 mm/Jahr) als für die Seebecken selbst (Lanalhue: 0.42 ± 0.71 mm/Jahr; Lleu Lleu: 0.49 ± 0.44 mm/Jahr). Die Schwellen scheinen deshalb Anzeiger einer bislang verdeckten Überschiebung zu sein, die Hebung und Verformung in der Region der beiden Seen beeinflusst. Seit ihrem Aufstauen werden in beiden Seen kontinuierlich lakustrine Sedimente abgelagert und so lokale/regionale Umwelt- und Klimaänderungen archiviert. Die Sedimentsequenzen zeigen einen Übergang von ariderem Klima im mittleren Holozän (8000 - 4200 Jahre vor heute) zu humideren Bedingungen im späten Holozän (seit 4200 Jahren). Dieser Trend stimmt mit anderen paläoklimatischen Daten der Umgebung überein, und wird als Zeichen einer Änderung in der Stärke bzw. Breitenlage der südhemisphärischen Westwinde interpretiert. Seit etwa 5000 Jahren sind die Sedimente des Lago Lleu Lleu durch regelmäßig auftretende detritische Lagen gekennzeichnet, die in ihrer Ursache sowohl tektonisch (z.B. durch Erdbeben) als auch klimatisch (z.B. durch Änderungen der El Niño Southern Oscillation) bedingt sein könnten. Seit etwa 2000 Jahren weisen in beiden Seen vermehrte Schwankungen im Terrigeneintrag auch auf kurzfristigere hydrologische Änderungen hin. Ein verminderter Eintrag lässt auf weniger humides Klima zwischen 200 B.C. - 150 A.D., 900 - 1350 A.D., und nach 1850 A.D. (in etwa der römischen, mittelalterlichen und gegenwärtigen Warmzeit) schließen; vermehrter Eintrag zwischen 150 - 900 A.D sowie 1350 - 1850 A.D. (in etwa den ‚Dark-Ages’ und der Kleinen Eiszeit) weist dagegen ein stärker humides Klima hin. Wie die Ergebnisse zeigen, ist die kombinierte Analyse von marinen und lakustrinen Sedimenten ein praktikabler Ansatz, um klimatische und tektonische Prozesse auf verschiedenen Zeitskalen in ein und demselben Archiv zu untersuchen. Die Methode lässt sich weitgehend auch auf andere aktive Kontinentalränder übertragen.

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Barnes, Jason B. "Variable Denudation in the Evolution of the Bolivian Andes: Controls and Uplift-Climate-Erosion Feedbacks". Thesis, The University of Arizona, 2002. http://hdl.handle.net/10150/240131.

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Controls on denudation in the eastern Bolivian Andes are evaluated by synthesis of new and existing denudation estimates from basin-morphometry, stream - powered fluvial incision, landslide mapping, sediment flux, erosion surfaces, thermochronology, foreland basin sediment volumes, and structural restorations. Centered at 17.5 °S, the northeastern Bolivian Andes exhibit high relief, a wet climate, and a narrow fold- thrust belt. In contrast, the southeastern Bolivian Andes have low relief, a semi-arid climate, and a wide fold-thrust belt. Basin -morphometry indicates a northward increase in relief and relative denudation. Stream-power along river profiles shows greater average incision rates in the north by a factor of 2 to 4. In the south, profile knickpoints with high incision rates are controlled by fold-thrust belt structures such as the surface expressions of basement megathrusts, faults, folds, and lithologic boundaries. Landslide and sediment-flux data are controlled by climate, elevation, basin morphology, and size and show a similar trend; short -term denudation-rate averages are greater in the north (1- 9 mm/yr) than the south (0.3-0.4 mm/yr). Long-term denudation-rate estimates including fission track, basin fill, erosion surfaces, and structural restorations also exhibit greater values in the north (0.2-0.8 mm/yr) compared to the south (0.04-0.3 mm/yr). Controls on long-term denudation rates include relief, orographic and global atmospheric circulation patterns of precipitation, climate change, glaciation, and fold-thrust belt geometry and kinematics. The denudation synthesis supports two conclusions: 1) denudation rates have increased towards the present 2) an along-strike disparity in denudation (greater in the north) has existed since at least the Miocene and has increased towards the present. Denudation rates and controls suggest that Bolivian mountain morphology is controlled by both its orientation at mid-latitude, and the feedbacks between uplift, kinematics, orographic effects on precipitation, glaciation, and the increased erosion that accompanies orogenesis.

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Axelsson, Samuel. "Uplink Interference Management of High Bit Rate Users in Evolved WCDMA". Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-276.

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The WCDMA air interface, used in the third generation mobile communication systems, is currently being evolved to improve the uplink, i.e. the radio links carrying traffic from the mobile user to the fixed network. An enhanced uplink concept is being developed to meet the expected needs from future applications like multimedia and video-streaming. This thesis studies interference management when high bit rates are introduced in the enhanced uplink. The study is performed through theoretical assessments and simulations using WCDMA system simulators.

An optimization scheme using a basic system throughput based scheduling is derived to attain a theoretical assessment of bit rate limits. The throughput optimization is achieved at the expense of user-experienced fairness. Users located on cell coverage area overlap show to be most complicated to manage.

The need for interference management is primary when the network deployment consists of small cells while coverage requirements are most essential when the cell size increases. By exploiting the benefits of directional antennas the antenna tilt can be tuned to increase performance resulting in increased bit rates, increased system throughput and increased resource efficiency. The improvements are attained without trade-offs and the different components of the study concur unanimously.

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Alias, Mohamad Yusoff. "Minimum bit error rate multiuser detection for multiple antenna aided uplink OFDM". Thesis, University of Southampton, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432466.

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Dair, Laura C. "Boundary Element Method Numerical Modeling: An Approach for Analyzing the Complex Geometry and Evolution of the San Gorgonio Knot, San Andreas Fault, Southern California". Amherst, Mass. : University of Massachusetts Amherst, 2009. http://scholarworks.umass.edu/theses/222/.

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Venkateswaran, Jayashankar. "A unified optimization framework for design of CDMA cellular networks with uplink and downlink rate guarantees". Ann Arbor, Mich. : ProQuest, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3271252.

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Thesis (M.S. in Electrical Engineering)--S.M.U., 2007.
Title from PDF title page (viewed Mar. 18, 2008). Source: Dissertation Abstracts International, Volume: 68-06, Section: B, page: 4040. Adviser: Dinesh Rajan. Includes bibliographical references.

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Katranaras, Efstathios. "Capacity and achievable sum rate of the cellular uplink with global and clustered multi-cell cooperation". Thesis, University of Surrey, 2009. http://epubs.surrey.ac.uk/844587/.

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With the emergence and continuous growth of wireless data services, the value of wireless networks is not only defined by how many users it can support, but also by its ability to concentrate large amounts of data capacity at localized spots. Information theory provides a mathematical framework which quantifies the maximum achievable data rate over a communication channel. More importantly, information theoretic study for capacity of cellular systems suggests base station cooperation as a mean of overcoming inter-cell interference limitations. The aim of this thesis is to investigate the information theoretic capacity of the cellular uplink. In order to quantify the performance of the current and future engineering solutions, the designers need to know the rate limits that a particular multi-user cellular system can provide and how far from the limit, lays the efficiency of their design. The gap between the information theoretic limit and the performance of currently known systems will also determine if the current systems are already saturated or have a potential to provide higher rates. More specifically, the thesis focuses on extending the known formulations for the cellular uplink under BS cooperation by; 1) incorporating, modeling and investigating the various effects of the multi-user channel that correspond to a real-world communication system (e.g. path loss, multipath and shadow fading, thermal noise) to provide a fundamental limit for the capacity of the wireless cellular network, 2) evaluating the effect of various practical parameters of real-world cellular systems on capacity, such as inter site distance, number of UTs per-cell, UT distribution over the cells, UT transmit power, 3) investigating how multiple directional antennas for site sectorization may improve the networks communication rates and, 4) exploring the achieving communication rates of clustered cellular systems as a more feasible strategy to be implemented nowadays to find when clustered cooperation becomes more beneficial.

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Guzman, Gutierrez Oswaldo. "Chronologie et dynamique de la formation des terrasses fluviales dans des chaînes des montagnes avec une surrection modéré : l'exemple du Vénézuéla et de l'Albanie". Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENU017/document.

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Cette recherche porte sur les interactions entre la tectonique, le climat et les processus géomorphologiques de la surface de la Terre à travers l'étude des terrasses fluviales au Venezuela et l’Albanie. Ces deux domaines ont été soumis à une surrection modérée, aux variations climatiques du Quaternaire et fournissent un large registre de terrasses fluviales. Ces contextes donnent l’opportunité d’étudier la dynamique de la formation des terrasses fluviales à l'échelle de temps 102-105 ans. Ainsi, une approche morpho-chronologique a été appliquée afin de parvenir à une meilleure compréhension de cette dynamique dans les rivières du Venezuela et de l’Albanie.Dans le système des rivières Pueblo Llano et Santo Domingo situé sur le flanc sud-est des Andes de Mérida au Venezuela, douze terrasses fluviales ont été identifiées pour les derniers 200 ka. Les mesures des concentrations du 10Be réalisées sur les dépôts fluviatiles et glaciaires ont permis d'estimer l'âge d’exposition de sept terrasses et d’un complexe de moraines frontales. Un modèle dynamique de terrasses soutenues par ces datations et des données géomorphologiques, stratigraphiques et sédimentologiques, indique que la formation de terrasses est principalement contrôlée par des variations climatiques de haute fréquence (103 à 104 ans) qui induisent un déséquilibre entre capacité de transport de l'eau et apport des sédiments. Néanmoins, le type de réponse a été très lié à l'altitude du site et l'influence des glaciers en amont. En effet, dans la partie supérieure du système, la succession des phases d'aggradation et d’incision a été synchronisée avec la succession des périodes froides-sèches et chaudes-humides, tandis que la partie inférieure du système montre une tendance opposée. Basé sur la restauration temporelle du taux d'incision de la partie inférieure du système, un taux de surrection de 1.1 mm/an au cours des dernières 70 ka a été estimé pour le flanc sud-est des Andes de Mérida. En outre, l'identification et la datation d'un complexe de moraines frontales situé à l'altitude de 2300 m au dessus du niveau de la mer met en évidence le fait que l'avancée glaciaire au cours du Dernier Maximum Glaciaire, dans d'autres domaines des Andes de Mérida, pourrait également avoir atteint des élévations inférieures à celles déjà signalés entre 2900 et 3500 m au dessus du niveau de la mer.En Albanie, les six principales rivières ont été analysées. De nouvelles données géomorphologiques et géochronologiques ont été intégrées aux données publiées afin de proposer un cadre stratigraphique et chronologique homogène à l’échelle régional pour les derniers 200 ka. Sur la base de ce cadre, l’âge de la formation de onze terrasses fluviales régionales a été établi. En Albanie, les processus de formation des terrasses ont également été principalement contrôlés par des variations climatiques de haute fréquence (103 à 104 ans). Néanmoins, les résultats montrent également que la réponse géomorphologique du système fluvial était probablement modulée par la taille des bassins versants et par les variations eustatiques. En effet, pour la période précédant le MIS 2, les terrasses de remplissage et d’abrasion ont été formées respectivement dans les grands et petits bassins versants. Pour la période après le début du MIS 2, une relation complexe entre les variations climatiques et eustatiques a favorisé le développement de terrasses d’abrasion partout en Albanie. Malgré des différences entre les réponses des rivières, la succession de phases d’aggradation ou d'abrasion latérale et de phases d'incision a été synchronisée avec la succession des périodes froides-sèches et chaudes-humides dans toutes les rivières de l'Albanie
This research addresses interactions between tectonics, climate and geomorphic processes at the surface of the Earth through the study of river terraces in Venezuela and Albania. Both areas have been exposed to moderate uplift, to Quaternary climatic variations and provide a wide record of river terraces. These contexts furnish opportunities to investigate the dynamics of terraces formation at 102-105 year time scale. Thus, a morphochronologic approach was applied in order to achieve greater understanding about this issue for the Venezuelan and Albanian rivers. In the Pueblo Llano and Santo Domingo rivers system located in the Southeastern flank of the Mérida Andes in Venezuela, twelve river terraces were identified for the last 200 ka. Analysis of 10Be concentration provides for the first time exposure ages for seven terraces and for one frontal moraine complex. A terraces model supported by these dating and geomorphologic, stratigraphic and sedimentologic data indicates that the formation of terraces was mainly controlled by high frequency (103-104 years) climatic variations through unsteady discharge of water and sediments. Nevertheless, the type of response was highly related to the altitude of the site and the influence of usptreams glaciers. As a matter of fact, in the upper reaches of the system, the succession of aggradation and incision phases were synchronized with the succession of cold-dry and warm-humid periods, while the lower reaches of the system show the opposite pattern. Based on the temporal restoration of the incision rate of the lower reaches of the system an uplift rate at 1.1 mm/a for the last 70 ka was estimated for the Southeastern flank of the MA. Additionally, the identification and dating of a frontal moraine complex located at elevation of 2300 m a.s.l. in the Pueblo Llano valley highlights the fact that the glacier advance during the Last Glacial Maximum, in other areas of the MA could have also reached lower elevation than those reported between 2900 and 3500 m a.s.l. In the Albania domain, the terrace records of the six main Albanian rivers were analyzed. New geomorphologic and geochronological data were integrated with published data in order to propose a regional homogeneous stratigraphic/chronologic framework for the last 200 ka. Based on this framework the timing of formation of eleven regional river terraces was established. In Albania, the processes of terraces formation were also mainly controlled by high frequency (103-104 years) climatic variations. Nonetheless, the results also show that the geomorphic responses of the fluvial systems were probably modulated by the size of the catchments and by eustatic variations. Indeed, for the pre-Marine Isotope Stage 2 (MIS 2) period, fill and strath terraces were formed in the large and small catchments, respectively. After the beginning of the MIS 2, a complex relation between climatic and eustatic variations only favored the development of strath terraces in large and small catchments. Despite of the differences between the rivers responses, the succession of aggradation or lateral erosion and incision phases were synchronized with the succession of cold-dry and warm-humid periods in all the rivers of Albania. Finally, the restoration of spatial and temporal variation of incision rate allowed: 1) identify the spatial variation of the mean long-term incision rate. It varies from less than 0.1 mm/a in Southern Albania to 1 mm/a in Northern Albania; 2) estimate vertical slip rates for eight active faults for the last 19 ka in Southern Albania. These vertical slip rates appear to decrease from ~2 to ~0.1 mm/a from the extensional domain in the Eastern Albania to the compressional domain in Western Albania

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Lefèvre, Marthe. "Segmentation des grands décrochements, du cycle sismique à la déformation long terme, exemple de la faille du levant". Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC100/document.

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Les failles décrochantes se caractérisent par des géométries 3D relativement complexes, avec des changements abrupts de structures associés à une segmentation latérale. Ainsi, comprendre comment les failles décrochantes sont segmentées latéralement peut apporter des informations sur la répartition de la déformation et des contraintes le long de ces failles ou encore leur comportement sismique. Dans cette étude nous avons cherché à caractériser ces paramètres pour la faille du Levant. Dans un premier temps nous nous sommes intéressés au comportement sismique de cette faille au cours des derniers millénaires. Pour cela, nous avons réalisé une tranchée paléosismologique le long de la section sud de la faille où les données sur la sismicité historique restent limitées. Cela nous a permis de proposer un scénario de rupture pour la section entre le golfe d’Aqaba et le Mont Liban (~500 km). Le catalogue obtenu montre que la faille a connu plusieurs crises sismiques d’environ 200 ans, durant lesquelles l’ensemble de la faille rompt en cascade, séparées par des périodes de quiescence d’environ 350-400 ans, suggérant que la sismicité suit un modèle de clustering temporel. Ce catalogue nous a également permis d’estimer le déficit de glissement accumulé au cours des derniers 1600 ans. Ce déficit, est homogène pour toute la section de faille considérée, à 2 m de moyenne, ce qui pourrait suggérer l’imminence d’une crise sismique régionale, puisque que la compensation d’un tel déficit se traduirait par l’occurrence d’un séisme de Mw ~7.2 sur chaque section de faille. Dans une deuxième partie, nous avons étudié la répartition de la déformation à long terme dans une zone présentant une géométrie relativement complexe : le golfe d’Aqaba. Dans cette région, nous avons cartographié à partir de données de terrain et d’images satellites un certain nombre de structures secondaires sur les marges du golfe. Ainsi, même si la faille principale se trouve en mer, une partie de la déformation verticale est accommodée à terre. La confrontation des datations thermochronologiques et cosmogéniques réalisées le long de la côte Est du golfe montre une accélération des taux de soulèvement à partir de 5 Ma, qui est interprétée comme une conséquence de la migration du pôle d’Euler associé à la rotation de la plaque Arabique. Cette migration a favorisé un régime transtensif dans le golfe d’Aqaba, entrainant la réactivation de failles anciennes bordant la plaine côtière. Enfin, afin d’évaluer les mécanismes contrôlant la segmentation des failles décrochantes et leur évolution dans le temps, nous avons réalisé des expériences analogiques en boite à sable. Elles nous ont permis de mettre en avant (1) l’impact majeur de l’épaisseur du matériel cassant sur la longueur des segments et (2) la pérennité de la segmentation des failles décrochantes, puisque la segmentation observée sur le terrain obéit aux mêmes lois d’échelle que la segmentation observée aux stades initiaux de déformation dans les boites à sable
Strike slip faults are characterised by complex 3D geometries, with abrupt structural variations and a high degree of lateral segmentation. Hence, understanding the underlying mechanisms of lateral fault segmentation can shed light on the distribution of deformation and stress along these faults, as well as their seismic behaviour. In this study, we have tried to characterise some of these parameters for the Levant fault. We first investigated the seismic behaviour of this fault over the last few thousand years. To do this we realised a paleoseimological trench along the southern section of the fault, in a region where historical seismic data are limited. This allowed us to propose a rupture scenario for the section running from the Gulf of Aqaba to Mount Lebanon (~500km). The resulting catalogue highlights several seismic crises about 200 years long during which the whole fault ruptures in a cascade, interspaced with quiescent periods of about 350-400 years. This suggests that the seismic behaviour of the fault presents temporal clustering. Our catalogue also allowed for the estimation of the slip deficit accumulated over the last 1600 years in the considered section. This deficit is homogeneous along the fault and relatively high (2 m on average), which could suggest that a seismic crisis could happen over the entire region in a near future, as the compensation of such deficit would require the occurrence of a Mw 7.2 event on each section of the fault. After that we studied the distribution of long-term deformation in a region with a relatively complex geometry: the Gulf of Aqaba. In this region we mapped from field data and satellite images several secondary structures on the margins of the gulf. Indeed, even though the main fault is at sea, part of the vertical deformation is accommodated on land. The confrontation of thermochronological and cosmogenic datations along the eastern coast of the gulf shows an acceleration of the uplift rates. We interpret this as a consequence of the migration of the Euler pole associated with the rotation of the Arabian plaque, 5 ky ago. This migration led to an increase of the transtension in the Gulf of Aqaba, which reactivated ancient faults bordering the coastal plain. Finally, in order to quantify the mechanisms controlling the segmentation of strike slip faults and their temporal evolution, we realised sand box experiments. Our results highlight the importance of the thickness of the brittle material and its impact on the segment lengths. They also show the persistence of strike slip faults segmentation since the segmentation observed in the field obeys the same scaling laws as that observed at the early stages of deformation in sand box experiments

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Yu, Yi. "Radio Resource Planning in Low Power Wide Area IoT Networks". Electronic Thesis or Diss., Paris, CNAM, 2021. http://www.theses.fr/2021CNAM1287.

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Cette thèse étudie le problème de planification des ressources pour les réseaux IoT longues portées basés sur les technologies NB-IoT et LoRa. Dans les deux cas, on suppose que les capteurs et les collecteurs sont distribués suivant des processus de points de Poisson spatial indépendants marqués par le caractère aléatoire du canal. Pour le NB-IoT, nous élaborons un modèle de dimensionnement statistique qui estime le nombre de ressources radio nécessaires en fonction du délai d’accès toléré, de la densité des nœuds actifs, des collecteurs et de la configuration de l’antenne. Pour le réseau LoRa, nous proposons une technique d’allocation de plusieurs sous-bandes pour atténuer le niveau élevé d’interférence induit par les nœuds qui transmettent avec le même facteur d’étalement. Pour allouer dynamiquement le facteur d’étalement et la puissance, nous présentons une approche d’apprentissage automatique avec multi-agents qui permet d’améliorer l’efficacité énergétique
In this thesis, we focus on radio resource planning issues for low power wide area networks based on NB-IoT and LoRa technologies. In both cases, the average behavior of the network is considered by assuming the sensors and the collectors are distributed according to independent random Poisson Point Process marked by the channel randomness. For the NB-IoT, we elaborate a statistical dimensioning model that estimates the number of radio resources in the network depending on the tolerated delay access, the density of active nodes, the collectors, and the antenna configuration with single and multi-user transmission. For the LoRa network, we propose a multi-sub band allocation technique to mitigate the high level of interference induced by nodes that transmit with the same spreading factor. To dynamically allocate the spreading factor and the power, we present a Q-learning multi-agent approach to improve the energy efficiency

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Libros sobre el tema "Uplift Rates"

Speed, Robert C. y Hai Cheng. Emergence and Evolution of Barbados. Editado por Christine Speed, Richard Sedlock y Lawrence Andreas. Geological Society of America, 2021. http://dx.doi.org/10.1130/spe549.

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Emergence and Evolution of Barbados is a three-part analysis of the Quaternary geologic and geomorphologic evolution of the island of Barbados in the southeastern Caribbean. “Geology of Southeastern Barbados” assembles and integrates detailed observations into a complex 700 k.y. history of marine sculpting and riverine flooding processes. “Marine Terrace Evolution of Windward Barbados” revises the Quaternary stratigraphy of the island, describes the tectonics of emergence, and demonstrates that uplift rates vary by location. “Active Emergence, Chronology, and Limestone Facies in Southeastern Windward Barbados” is the first comprehensive study to integrate marine erosion and deposition with tectonic uplift rates. Major findings of this work are that Barbados’ Central Highlands are an erosional remnant, and that terraces originated principally by marine erosion rather than by reef construction.

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Canfield, Donald Eugene. Phanerozoic Oxygen. Princeton University Press, 2017. http://dx.doi.org/10.23943/princeton/9780691145020.003.0011.

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This chapter discusses the modeling of the history of atmospheric oxygen. The most recently deposited sediments will also be the most prone to weathering through processes like sea-level change or uplift of the land. Thus, through rapid recycling, high rates of oxygen production through the burial of organic-rich sediments will quickly lead to high rates of oxygen consumption through the exposure of these organic-rich sediments to weathering. From a modeling perspective, rapid recycling helps to dampen oxygen changes. This is important because the fluxes of oxygen through the atmosphere during organic carbon and pyrite burial, and by weathering, are huge compared to the relatively small amounts of oxygen in the atmosphere. Thus, all of the oxygen in the present atmosphere is cycled through geologic processes of oxygen liberation (organic carbon and pyrite burial) and consumption (weathering) on a time scale of about 2 to 3 million years.

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Sime, Stuart. 2. Funding Litigation. Oxford University Press, 2016. http://dx.doi.org/10.1093/he/9780198747673.003.0107.

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This chapter discusses the issue of funding litigation. Solicitors have a professional duty to advise clients on litigation funding options. The advice and agreed funding method should be confirmed in writing in a ‘client care letter’. Most commercial clients pay their lawyers under the traditional retainer, normally with an agreed hourly rate. Conditional free agreements (CFAs) or ‘no win, no fee’ agreements are increasingly common. They allow a lawyer to agree not to charge the client if the proceedings are unsuccessful, but to charge an uplift or ‘success fee’ of up to 100 per cent over the solicitor’s usual costs if the proceedings are successful. Damages-based agreements (DBAs) are a form of contingency fee agreement under which the lawyer is paid out of the sums recovered in the proceedings. Public funding is restricted to individuals with modest income and capital, and there are wide exclusions from the scheme.

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Sime, Stuart. 2. Funding Litigation. Oxford University Press, 2018. http://dx.doi.org/10.1093/he/9780198823100.003.0107.

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This chapter discusses the issue of funding litigation. Solicitors have a professional duty to advise clients on litigation funding options. The advice and agreed funding method should be confirmed in writing in a ‘client care letter’. Most commercial clients pay their lawyers under the traditional retainer, normally with an agreed hourly rate. Conditional free agreements (CFAs) or ‘no win, no fee’ agreements allow a lawyer to agree not to charge the client if the proceedings are unsuccessful, but to charge an uplift or ‘success fee’ of up to 100 per cent over the solicitor’s usual costs if the proceedings are successful. Damages-based agreements (DBAs) are a form of contingency fee agreement under which the lawyer is paid out of the sums recovered in the proceedings. Public funding through legal aid is restricted to individuals with modest income and capital, and there are wide exclusions from the scheme.

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Sime, Stuart. 2. Funding Litigation. Oxford University Press, 2017. http://dx.doi.org/10.1093/he/9780198787570.003.0107.

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Capítulos de libros sobre el tema "Uplift Rates"

Blum, Joel D. "The Effect of Late Cenozoic Glaciation and Tectonic Uplift on Silicate Weathering Rates and the Marine 87Sr/86Sr Record". En Tectonic Uplift and Climate Change, 259–88. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5935-1_11.

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Arrowsmith, RamóN, Roland BüRgmann y Trevor Dumitru. "Uplift and Fault Slip Rates in the Southern San Francisco Bay Area Constrained by Fission-Tracks, Geomorphology, and Geodesy". En AGU Reference Shelf, 503–8. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/rf004p0503.

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Glassley, William E. y Annemarie Meike. "Using Arrested Solid — Solid Multiphase Reactions in Geological Materials to Deduce the Rate of Crustal Uplift". En Properties of Complex Inorganic Solids 2, 141–54. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-1205-9_12.

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Khademi, Naeem, Michael Welzl y Renato Lo Cigno. "On the Uplink Performance of TCP in Multi-rate 802.11 WLANs". En NETWORKING 2011, 368–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20798-3_28.

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Zhang, Tianyu, Jian Sun, Xianxian Wang y Zhongshan Zhang. "Coverage Probability and Data Rate of D2D Communication Under Cellular Networks by Sharing Uplink Channel". En Communications and Networking, 380–89. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66625-9_37.

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Wong, Tung Chong, Jon W. Mark y Kee Chaing Chua. "Performance Analysis of Variable Bit Rate Multiclass Services in the Uplink of a Dynamic Complete Partitioning Round-Robin Carrier-Hopping Multirate Multi-carrier DS-CDMA System". En Lecture Notes in Computer Science, 1495–501. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-24693-0_141.

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Ruggeri, Eugenio, Apostolos Tsakyridis, Christos Vagionas, George Kalfas, Amalia Miliou, Nikos Pleros y Yigal Leiba. "A Fiber Wireless A-RoF/IFoF Uplink Transmission of up to 0.6 Gb/s User Data Rate Over a 32-Element 60 GHz Beam-Steering Antenna for 5G Fronthaul Networks". En Internet of Things, Infrastructures and Mobile Applications, 1067–75. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-49932-7_100.

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"Rates of Erosion and Uplift". En Tectonic Geomorphology, 195–242. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9781444345063.ch7.

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Nordman, M., A. Peltola, M. Bilker-Koivula y S. Lahtinen. "Past and Future Sea Level Changes and Land Uplift in the Baltic Sea Seen by Geodetic Observations". En International Association of Geodesy Symposia. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/1345_2020_124.

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Abstract We have studied the land uplift and relative sea level changes in the Baltic Sea in northern Europe. To observe the past changes and land uplift, we have used continuous GNSS time series, campaign-wise absolute gravity measurements and continuous tide gauge time series. To predict the future, we have used probabilistic future scenarios tuned for the Baltic Sea. The area we are interested in is Kvarken archipelago in Finland and High Coast in Sweden. These areas form a UNESCO World Heritage Site, where the land uplift process and how it demonstrates itself are the main values. We provide here the latest numbers of land uplift for the area, the current rates from geodetic observations, and probabilistic scenarios for future relative sea level rise. The maximum land uplift rates in Fennoscandia are in the Bothnian Bay of the Baltic Sea, where the maximum values are currently on the order of 10 mm/year with respect to the geoid. During the last 100 years, the land has risen from the sea by approximately 80 cm in this area. Estimates of future relative sea level change have considerable uncertainty, with values for the year 2100 ranging from 75 cm of sea level fall (land emergence) to 30 cm of sea-level rise.

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Searle, Mike. "Mapping the Geology of Everest and Makalu". En Colliding Continents. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199653003.003.0013.

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There are few places in the world where a geologist can actually take a look at the rocks and structures 5 or 6 kilometres down beneath the Earth’s surface. The opposing forces of nature—the uplift of rocks towards the Earth’s surface and their erosion and removal—usually balance each other out, at least roughly. It is only where the rate of uplift of rocks greatly exceeds erosion that high mountains are built. This is precisely why the Himalaya are so unique to geologists studying mountain-building processes. The Himalaya is an active mountain range: the plate convergence rates are high, uplift rates are extremely high, and glacial and fluvial erosion has carved deep channels in between the mountains. By walking and climbing all around Everest we can actually map and study the rocks in three dimensions, which elsewhere, beneath the Tibetan Plateau for example, remain buried below the Earth’s surface. After the Survey of India discovered that Mount Everest was the highest mountain in the world, a pioneering expedition set out to fly across the summit and take photographs. On 3 April 1933 a Houston-Weston biplane piloted by Lord Clydesdale flew across the summit and took the first photos of the mountain. Clydesdale wrote: ‘We were in a serious position. The great bulk of Everest was towering above us to the left, Makalu down-wind to the right and the connecting range dead ahead, with a hurricane wind doing its best to carry us over and dash us on the knife-edge side of Makalu.’ The earliest geologists to study the structure of Mount Everest, A. M. Heron and Noel Odell, both noted the apparent conformity of strata with sedimentary rocks on top of the mountain lying above the more metamorphosed rocks around the base In his 1965 paper on the structure of Everest, Lawrence Wager wrote: ‘It never ceases to surprise the writer that the highest point of the Earth’s surface is composed of sedimentary rocks which are relatively flat-lying and but little metamorphosed.’

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Actas de conferencias sobre el tema "Uplift Rates"

Zhang, Shaobo y Kory W. Hedman. "Conditions for Ramp Rates Causing Uplift". En 2019 North American Power Symposium (NAPS). IEEE, 2019. http://dx.doi.org/10.1109/naps46351.2019.9000202.

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Wobbe, Florian, Klaus Stanek y Richard Gloaguen. "Uplift rates from river profiles: methodology and case study, Oriente, Cuba". En 2007 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2007. http://dx.doi.org/10.1109/igarss.2007.4423126.

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Williamson, Landon, Lee B. Corbett, Paul R. Bierman, Jeremy D. Shakun y Dylan H. Rood. "RAPID POST-GLACIAL EMERGENCE RATES MEASURED WITH 10BE MATCH GPS-DETERMINED CONTEMPORARY UPLIFT RATES IN SOUTHEAST GREENLAND". En GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-339223.

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Wakasugi, Keiichiro, Kunihiko Nakajima, Hidenori Shimemoto, Masahiro Shibata y Masaaki Yamaguchi. "Bounding Analysis of Uplift and Erosion Scenario for an HLW Repository". En 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-16724.

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Uplift and erosion scenarios must be analysed since these natural phenomena are expected to be inevitable at most districts in Japan. It is increasingly important to enhance the confidence in uplift and erosion scenarios even if these processes occur far into the future, since performance assessment cut-off times have not yet been defined. In this context, this study specifies uplift and erosion scenarios considering uplift and fluvial erosion based on Japanese geological and topographical characteristics and describes a conceptual model focused on a comprehensive fluvial erosion process that were based on generalisations of field observations. A series of bounding analyses have been carried out to define parameter conditions to satisfy hypothetical dose criteria considering various uplift and erosion rates and transmissivities. The results based on the conservative assumptions show that there are some cases that satisfy the hypothetical dose criterion in each phase for the likely scenario (base scenario: 10 μSv/y), which is a targeted dose suggested by the Nuclear Safety Commission for sub-surface disposal. All cases are below 300 μSv/y, which is the targeted dose for the less-likely scenario (variant scenario) as well as the dose constraint for radioactive waste disposal by the International Commission on Radiological Protection. The discussion also provides that a loss of inventory in the engineered barrier system by accelerating release of nuclides does not significantly decrease the doses in later phases due to inherent attributes of the repository system, i.e. multiple barriers and multiple safety functions. In principle, the influence of uplift and erosion should be reduced by appropriate site selection and design, to the extent possible; to ensure that sufficient nuclides decay while the repository is deep underground.

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Wong, C. K., R. G. Wan, R. Wong y B. Liu. "Physical Modelling on Buried Pipeline Response in Elasto-Viscoplastic Soils". En 2016 11th International Pipeline Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ipc2016-64249.

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Buried pipeline systems may traverse sections of unstable soil masses. Long-term ground movement may induce large strains on the pipe over time. To maintain the integrity of the pipeline, pipeline engineers and designers need to assess the frequency of critical ground movements to perform necessary remediation such as a stress relief procedure to prolong pipeline operation. The frequency of applying necessary remediation measures will vary depending on the rate of soil displacement in elasto-viscoplastic soils such as clay. Previous experimental work on simulating soil-pipe interactions was completed extensively on granular soils such as sand. Thus, an experimental program in simulating soil-pipe interaction for buried pipes in elasto-viscoplastic soils is highlighted in this paper. The experimental setup comprises a steel soil chamber (0.9 m in width and height, 2.4 m in length) with a steel pipe (150 mm diameter) being embedded in a compacted clay inside the chamber. The pipe is subjected to relative longitudinal, vertical uplift, and horizontal transverse displacements. The equipment setup has the ability to control and vary the displacement rate of the pipe. Hence, the effect of various displacement rates on the system response or the subgrade reaction can be studied. The system response or the subgrade reaction is recorded in a data acquisition system. In this paper, preliminary results of a vertical uplift test will be compared with existing guidelines from the American Lifelines Alliance (ALA). The ALA guidelines have yet to incorporate the effect of varying soil displacement rates in determining maximum loads subjected onto a pipeline.

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Ritter, Amy, Jose Luis Antinao Rojas y Genaro Martinez Gutierrez. "GEOMORPHOLOGY AND RELATIVE UPLIFT RATES OF QUATERNARY MARINE TERRACES OF SAN MARCOS ISLAND, BAJA CALIFORNIA SUR, MEXICO". En GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-359872.

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Bowness, Nina y Ben Surpless. "POTENTIAL EFFECTS OF OROGRAPHIC PRECIPITATION ON RATES OF EROSION AND ISOSTATIC UPLIFT OF THE WASATCH FAULT ZONE FOOTWALL". En Cordilleran Section-117th Annual Meeting-2021. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021cd-363004.

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Laws, Alexander W., Jillian M. Maloney, Shannon A. Klotsko, Amy E. Gusick, Todd J. Braje y David Ball. "MEASURING LATE QUATERNARY UPLIFT RATES OF MARINE TERRACES USING HIGH-RESOLUTION CHIRP SUB-BOTTOM DATA, NORTHERN CHANNEL ISLANDS, CALIFORNIA, USA". En Joint 70th Annual Rocky Mountain GSA Section / 114th Annual Cordilleran GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018rm-314015.

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Brannon, Harold y Nicole Hoffman. "Incorporation of Neutrally Buoyant Proppants in Horizontal Unconventional Wells to Increase Propped Fracture Area Results for Substantially Improved Well Productivity and Economics". En SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205845-ms.

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Abstract Hydraulic fracturing stimulation of unconventional wells employing large volumes of sand in low viscosity fluids provides propped fracture conductivity in less than 25% of the created fracture area, primarily because of poor sand transport mechanics. The remaining unpropped area is at best only marginally productive using the conventional sand/slickwater hydraulic fracturing process alone. Near-neutrally buoyant proppants (NBPs, ASG 1.055) have proven to be highly effective in accessing production from fracture area that is otherwise left unpropped. Fracture models illustrate the propped fracture area of designs incorporating NBPs is improved to over 85% of the created fracture area. Production simulations of typical slickwater and sand frac designs supplemented with NBPs at 3% by weight of sand distributed evenly throughout the slurry stages show cumulative production increases of 20% to greater than 50% compared to the large volume slickwater/sand treatments without NBPs. Efforts have been directed to justification of the incremental expense involved with the NBP applications and assessment of the associated value-added economic metrics, including the value of the realized incremental production vs. time, the payback time for recovery of the incremental costs, and Return on Investment (ROI). For example, in a 2018 trial of NBP wells in the Middle Bakken formation of North Dakota, the production uplift observed for NBP wells achieved payback of the incremental costs in an average of 26 days; the 1-year cumulative oil production of the NBP wells averaged 69,632 barrels greater than control wells, resulting in a 25% uplift compared to the offset control wells. The Year 1 Return on Investment (ROI) for the drilling and completion costs of the first Middle Bakken well with NBP was 97% versus 64% for the sand-only control wells. Controlled multi-stage horizontal completions of wells with sand-only have been evaluated against wells utilizing NBPs in the application have been executed within several unconventional plays, including the Permian and Williston basins. The performance of the NBP wells have consistently validated the production uplift predictions of the production simulation models. The case studies analyzed herein expand the economic assessment of the NBP stimulation designs by including production analyses quantitative comparison of Net Present Value, production decline rates, and projected EURs of the NBP wells and non-NBP offset wells.

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Daocharoenporn, Siripong, Mongkol Mongkolwongrojn, Shubhankar Kulkarni y Ahmed A. Shabana. "Pantograph/Catenary Wear Using Multibody System Dynamic Algorithms". En 2020 Joint Rail Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/jrc2020-8006.

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Abstract In this investigation, computational multibody systems (MBS) algorithms are used to develop detailed railroad vehicle models for the prediction of the wear resulting from the pantograph/catenary dynamic interaction. The catenary wear is predicted for different motion scenarios that include constant-speed curve negotiation, and acceleration and deceleration on a tangent (straight) track. The effect of the vehicle vibration in these different motion scenarios on the contact force is further used to study the wear rates of the contact wire. The wear model used in this investigation accounts for the electrical and the mechanical effects. The nonlinear finite element (FE) absolute nodal coordinate formulation (ANCF), which is suitable for implementation in MBS algorithms, is used to model the flexible catenary system, thereby eliminating the need for using incremental rotation procedures and co-simulation techniques. The pantograph/catenary elastic contact formulation employed in this study allows for separation between the pantograph pan-head and the contact wire, and accounts for the effect of friction due to the sliding between the pantograph pan-head and the catenary cable. The approach proposed in this investigation can be used to evaluate the electrical contact resistance, contribution of the arcing resulting from the pan-head/catenary separation, mechanical and electrical wear contributions, and effect of the pantograph mechanism uplift force on the wear rate.

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