Дисертації з теми "Heat and salt transport"
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Yari, Sadegh. "Heat and salt transport across the strait of Otranto." Doctoral thesis, Università degli studi di Trieste, 2009. http://hdl.handle.net/10077/3213.
Повний текст джерелаThe water transport and advected heat through the Strait of Otranto are computed applying a new methodology to the historical data set. According to the previous oceanographic studies, the Adriatic Sea annually loses heat through the air-sea interface. This heat loss should be balanced by the heat advected across the Strait of Otranto. Direct current measurements for almost one year (from December 94 through November 95), and five seasonal oceanographic campaigns are used in this study. The current data are measured at sixteen locations at different depths; near surface, intermediate depths and near bottom. The measured current data are detided and low pass filtered in order to remove tidal and inertial oscillations. A variational inverse method based on a variational principle and a finite element solver is used to reconstruct the current field across the Strait section from sparse measurements. The mean water flow across the strait consists of an inflow on the eastern side and an outflow on the western side, while there is a two layer structure in the central part. The latter has an inflow in the surface layer and an outflow in the bottom layer. The mean monthly, seasonally and yearly water transports and corresponding errors are calculated. The mean annual inflow and outflow water transport rates are estimated as 0.90±0.04 Sv and -0.94±0.31 (error) Sv and the net transport is equal to -0.04±0.32 (error) Sv. Thus, on a yearly time interval, the inflow and the outflow are practically compensated. These estimations of water transport are in agreement with previous studies. The seasonal heat flux is estimated by using the data collected during the hydrographic surveys conducted in December 1994, February, May, August and November 1995. The results show a net heat advection into the Adriatic Sea on a yearly basis. The estimated values of advected heat applying two different methods are 2.93±0.35 TW and 2.5±0.35 TW, which are equivalent to heat gain of 21.3±2.5 (error) Wm-2 and 17±2.5 Wm-2 for the whole basin which are compared to the calculated heat loss of -36±152 (std) Wm-2 over the Adriatic Sea. Salt transported salt is calculated by using salinity and current data. The average annual salt transport is estimated as an inflow of salt equal to 0.05106 Kgs-1. This is in agreement with the fact that the Adriatic Sea is a dilution basin. The average annual fresh water budget is estimated as -0.002 Sv which is equivalent to fresh water gain of 0.45 m/year for the entire Adriatic Sea.
XXI Ciclo
1972
Cisewski, Boris. "Der Transport von Wärme, Wasser und Salz in den Arktischen Ozean = The transport of heat, mass and salt into the Arctic Ocean /." Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung, 2001. http://www.gbv.de/dms/bs/toc/327039299.pdf.
Повний текст джерелаFlanders, Justin M. "Thermal Transport and Heat Exchanger Design for the Space Molten Salt Reactor Concept." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1345508695.
Повний текст джерелаOlson, Elise. "Oceanic transports of heat and salt from a global model and data." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38560.
Повний текст джерелаIncludes bibliographical references (leaves 49-50).
A state estimate produced by ECCO-GODAE from a global one-degree model and data spanning the years 1992-2005 is analyzed in terms of transports of volume, temperature, and freshwater. The estimate is assessed to be sufficiently close to observations to merit analysis. The methods of analysis are similar to those of Stammer et al. (2003). The longer time period allows trends to be measured with greater confidence. Time mean flow characteristics demonstrate agreement with previous estimates. The strength of the ACC (146±5Sv) is larger than in the Stammer et al. (2003) state estimate, but is within the range of other estimates. A twelve-year decreasing trend is observed in the strength of the ACC of approximately 0.88Sv/year. The Indonesian throughflow transport of 1 l±2Sv is within the expected range. There is also a decreasing twelve year trend in the strength of the ITF of 0.065Sv/year. The ITF is stronger in boreal summer than boreal winter by approximately 4Sv. A strong annual cycle is present in the transport record on most sections, but higher frequency variability is also present. Most temperature transport variability results from velocity fluctuations, except in the Southern Ocean where temperature fluctuations are more important. Recommended further work includes a more detailed analysis of variability in this state estimate.
by Elise Olson.
S.M.
Chea, Nila. "Salt. Fat. Acid. Heat. Media." Thesis, Malmö universitet, Fakulteten för kultur och samhälle (KS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-22680.
Повний текст джерелаDaher, Ibrahim. "Salt transport experiments in fractured media." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/45285.
Повний текст джерелаVenter, Jason Stephen. "Salt River multi modal transport interchange." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/5580.
Повний текст джерелаIncludes bibliographical references.
South African cities have unique spatial design challenges which can be attributed to our historical and politically charged urban planning practices. Our cities are characterised by modernist town planning principles which have fragmented communities through spatial barriers such as highways, train lines and fences while current development perpetuates urban sprawl. Due to these circumstances many contemporary urban design policies promote densification strategies through transit orientated approaches.In my thesis project, I propose to redesign Salt River Train Station into a multi modal transport interchange. I argue that this multimodal interchange can have an urban developmental and regenerative effect that can address some of the challenges faced in our urban landscape. This design report will attempt to document the processes and explorative methods that I have incorporated during this design process.
Reed, D. J. "Suspended sediment transport in salt marsh creeks." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355891.
Повний текст джерелаDrake, Arly Marie. "EFFECT OF PLANT GROWTH REGULATORS ON CREEPING BENTGRASS GROWTH AND HEALTH DURING HEAT, SALT, AND COMBINED HEAT AND SALT STRESS." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546450732510932.
Повний текст джерелаLegault, Stephane. "Heat transport in quasicrystals." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0021/NQ55355.pdf.
Повний текст джерелаLegault, Stéphane. "Heat transport in quasicrystals." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36034.
Повний текст джерелаAt low temperatures (below 20K), the thermal conductivity is defect limited, being controlled by boundary scattering, two level systems, stacking faults and dislocations. At high temperatures (above 20K), we find the thermal conductivity is limited by intrinsic properties of the quasicrystalline structure and phonon-phonon scattering.
From fitting the thermal conductivity to a detailed model we are able to predict the maximum thermal conductivity of a perfect quasicrystal.
Allsopp, Adrian J. "The effects of dietary sodium intake on heat acclimation and thermoregulation during heat exposure." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241791.
Повний текст джерелаClark, Rowan Elizabeth. "Structural studies of salt hydrates for heat-storage applications." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31333.
Повний текст джерелаShukla, Nitin. "Heat Transport across Dissimilar Materials." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/27820.
Повний текст джерелаPh. D.
Hawkins, Kirstie. "Salt tolerance and chloride transport in three beet subspecies." Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270062.
Повний текст джерелаSkosana, Petrus Jabu. "Wall Heat Transfer Coefficient in a Molten Salt Bubble Column." Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/46246.
Повний текст джерелаDissertation (MEng)--University of Pretoria, 2014.
tm2015
Chemical Engineering
MEng
Unrestricted
Raud, Ralf. "Optimized salt selection for solar thermal latent heat energy storage." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/116429/1/Ralf_Raud_Thesis.pdf.
Повний текст джерелаBeardo, Ricol Albert. "Generalized Hydrodynamic Heat Transport in Semiconductors." Doctoral thesis, Universitat Autònoma de Barcelona, 2021. http://hdl.handle.net/10803/673590.
Повний текст джерелаÉsta tesis presenta una descripción unificadora de una variedad de experimentos de transporte térmico a la micro y nano escala en semiconductores como el silicio o el germanio. Se utilitza un modelo de transporte de calor hidrodinámico para predecir la respuesta no difusiva de sistemas complejos en situacions de relevancia tecnológica, como el proceso de enfriamento de un componente electrónico liberando calor hacia un sustrato semiconductor. El modelo no utilitza parámetros de ajuste en función de la geometría, sinó que utiliza parámetros calculados des de primeros principios. Los efectos de tamaño reducido o alta frecuencia se capturan a través de condiciones de contorno específicas y, por tanto, el modelo es una herramienta útil para el diseño de dispositivos micro electrónicos. Dado que la descripción hidrodinámica para el silicio no es el método convencional, en ésta tesis se presta especial atención a determinar la aplicabilidad del modelo en múltiples experimentos de forma unificadora. Como resultado, se identifican fenómenos no difusivos como la propagación de segundo sonido en campos térmicos fluctuantes en germanio, o múltiples tiempos de relajación en la evolución térmica de calentadores nano estructurados en silicio. Además, la descripción hidrodinámica se compara con otros modelos modernos para describir los mismos experimentos, y se proporciona un resumen de las herramientas teóricas necesarias (la termodinámica de no equilibrio y la teoria cinética). Utilizando las evidencias experimentales que se aportan, se concluye que el modelo hidrodinámico tiene capacidad predictiva de la respuesta térmica de materiales como el silicio a la nano escala dentro de un cierto rango de aplicabilidad.
This thesis presents a unifying description of a variety of experiments on micro- and nano-scale heat transport in semiconductors like silicon or germanium. A hydrodynamic-like heat transport model is used to predict the non-diffusive thermal response of complex systems in technologically relevant situations, like the process of energy release from nanostructured heat sources towards a semiconductor substrate. The model does not use geometry-dependent or fitted parameters, but use intrinsic material properties that can be calculated from first principles. Small-size and high-frequency effects are captured through the use of specific boundary conditions, thus resulting in a practical tool for complex microelectronic device design. Since hydrodynamic modeling is not the state-of-the-art approach to describe standard semiconductors like silicon, special care is devoted to quantitatively determine the applicability of the model, and multiple experiments using different techniques are considered and studied in a unifying way. As a result, previously unreported non-Fourier phenomena in materials like silicon or germanium is identified and demonstrated (e.g. second sound in rapidly varying thermal fields or multiple decay times characterizing the evolution of nano-structured heaters). Furthermore, the hydrodynamic description is compared with alternative modern frameworks describing size and frequency effects in semiconductor heat transport, and a summarized overview of the theoretical background, namely non-equilibrium thermodynamics and kinetic theory, is presented. In light of the extensive experimental evidence provided, this thesis demonstrate the predictive capability of hydrodynamic-like thermal transport modeling in semiconductors within a certain range of applicability that is well beyond the diffusive regime.
Universitat Autònoma de Barcelona. Programa de Doctorat en Física
Niemi, Daniel, and Joel Hambraeus. "Heat Transport in Inhomogeneous Harmonic Chains." Thesis, KTH, Skolan för teknikvetenskap (SCI), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-275699.
Повний текст джерелаVisarraga, Darrin Bernardo. "Heat transport models with distributed microstructure." Access restricted to users with UT Austin EID, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3036605.
Повний текст джерелаSharma, Mukta. "Parallel Heat Transport in Magnetized Plasma." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/1470.
Повний текст джерелаLippy, Matthew Stephen. "Development of a Minichannel Compact Primary Heat Exchanger for a Molten Salt Reactor." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/32603.
Повний текст джерелаMaster of Science
Saleh, Livia [Verfasser]. "Chloride transport and salt tolerance mechanisms in plants / Livia Saleh." Kiel : Universitätsbibliothek Kiel, 2011. http://d-nb.info/1036243052/34.
Повний текст джерелаKonukcu, Fatih. "Upward transport of water and salt from shallow saline watertables." Thesis, University of Newcastle Upon Tyne, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360265.
Повний текст джерелаBowen, Melissa Marie. "Mechanisms and variability of salt transport in partially-stratified estuaries." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1912/2130.
Повний текст джерела"February 2000."
Includes bibliographical references (leaves 163-171).
The variability of salt transport determines the variation of the length of the salinity intrusion and the large-scale density gradient in an estuary. This thesis contains three studies that address salt transport and the salt balance. The variation of salt transport with the depth, the along-channel salinity gradient, and the amplitude of the tidal velocity is investigated with analytic and numerical models. The results indicate that salt transport increases dramatically during stratified periods when vertical mixing is weak. Analysis of salt transport from observations in the Hudson Estuary show that stratified periods with elevated estuarine salt transport occur in five-day intervals once a month during apogean neap tides. Oscillatory salt transport, which is hypothesized to be primarily caused by lateral exchange and mixing of salt, appears to play a more minor role in the salt balance of the estuary. The salt balance of the estuary adjusts very little to the spring-neap modulation of salt transport but adjusts rapidly to pulses of freshwater flow. A simple model is used to investigate the process and time scales of adjustment of the salt balance by connecting variations of salt transport to the variations of freshwater flow and vertical mixing. The results show the length of the salinity intrusion adjust via advection to rapid and large increases in freshwater flow. The salinity intrusion adjusts more rapidly to the spring-neap cycle of tidal mixing the higher the freshwater flow.
by Melissa Marie Bowen.
Ph.D.
Splith, Tobias, Christian Chmelik, Frank Stallmach, Stefan K. Henninger, Gerrit Füldner, Panagiotis D. Kolokathis, Evangelia Pantatosaki, and George K. Papadopoulos. "Adsorptive heat transformation with SAPO-34." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-198701.
Повний текст джерелаFan, Jing, and 范菁. "Heat transport in nanofluids and biological tissues." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B47752853.
Повний текст джерелаpublished_or_final_version
Mechanical Engineering
Doctoral
Doctor of Philosophy
Jayne, Steven Robert. "Dynamics of global ocean heat transport variability." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/69203.
Повний текст джерелаIncludes bibliographical references (p. 161-169).
A state-of-the-art, high-resolution ocean general circulation model is used to estimate the time-dependent global ocean heat transport and investigate its dynamics. The north-south heat transport is the prime manifestation of the ocean's role in global climate, but understanding of its variability has been fragmentary owing to uncertainties in observational analyses, limitations in models, and the lack of a convincing mechanism. These issues are addressed in this thesis. Technical problems associated with the forcing and sampling of the model, and the impact of high-frequency motions are discussed. Numerical schemes are suggested to remove the inertial energy to prevent aliasing when the model fields are stored for later analysis. Globally, the cross-equatorial, seasonal heat transport fluctuations are close to +4.5 x 1015 watts, the same amplitude as the seasonal, cross-equatorial atmospheric energy transport. The variability is concentrated within 200 of the equator and dominated by the annual cycle. The majority of it is due to wind-induced current fluctuations in which the time-varying wind drives Ekman layer mass transports that are compensated by depth-independent return flows. The temperature difference between the mass transports gives rise to the time-dependent heat transport. The rectified eddy heat transport is calculated from the model. It is weak in the central gyres, and strong in the western boundary currents, the Antarctic Circumpolar Current, and the equatorial region. It is largely confined to the upper 1000 meters of the ocean. The rotational component of the eddy heat transport is strong in the oceanic jets, while the divergent component is strongest in the equatorial region and Antarctic Circumpolar Current. The method of estimating the eddy heat transport from an eddy diffusivity derived from mixing length arguments and altimetry data, and the climatological temperature field, is tested and shown not to reproduce the model's directly evaluated eddy heat transport. Possible reasons for the discrepancy are explored.
by Steven Robert Jayne.
Sc.D.
Witharana, S. "Thermal transport in nanofluids : boiling heat transfer." Thesis, University of Leeds, 2011. http://etheses.whiterose.ac.uk/1648/.
Повний текст джерелаRonetti, Flavio. "Charge and heat transport in topological systems." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0541/document.
Повний текст джерелаIn this thesis, I address the intriguing and appealing topic of charge and heat transport in quantum Hall systems, which are among the most famous example of topological phases of matter, in presence of external time-dependent voltages. Quantum Hall effect occurs in two-dimensional electron systems in the limit of strong perpendicular magnetic fields. The hallmark of quantum Hall systems is the emergence of one-dimensional metallic edge states on the boundary. Along these edge states particles propagate with a definite direction. The coherence length ensured by topological protection guarantees to access wave-like nature of electrons. This properties inspired a new field of research, known as electron quantum optic. Single-electron source can be realized by applying to a quantum Hall system a periodic train of Lorentzian-shaped pulses.Plateaus of the Hall resistance appear also at fractional values of the resistance quantum. The physical explanation of fractional quantum Hall effect cannot neglect the correlation between electrons and this phase of matter is inherently strongly-correlated. By considering the application of a periodic train of Lorentzian pulses to a quantum Hall system, I investigate the charge density of a state composed by many levitons in the fractional quantum Hall regime, thus finding that it is re-arranged into a regular pattern of peaks and valleys, reminiscent of Wigner crystallization in strongly-interacting electronic systems. Then, I analyze heat transport properties of levitons in quantum Hall systems, which represent a new point of view on electron quantum optics, extending and generalizing the results obtained in the charge domain
RONETTI, FLAVIO. "Charge and heat transport in topological systems." Doctoral thesis, Università degli studi di Genova, 2018. http://hdl.handle.net/11567/933059.
Повний текст джерелаDiGuilio, Ralph Michael. "The thermal conductivity of molten salts and concentrated aqueous salt solutions." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/11847.
Повний текст джерелаGoff, Kenneth Michael. "The transport of cadmium through molten salts." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/13409.
Повний текст джерелаElphick, Carmen Heather. "Na'+ transport and Ca'2'+ signalling in higher plant salt tolerance." Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341845.
Повний текст джерелаTedder, Newton William. "Dissolved Road Salt Transport in Urban and Rural Watersheds in Massachusetts." Thesis, Boston College, 2009. http://hdl.handle.net/2345/984.
Повний текст джерелаThesis advisor: Yvette Kuiper
Chloride-based deicers (NaCl, CaCl2, MgCl2), also referred to as road salt, are the most common substances used in maintaining safe roadway surfaces during the winter months. Upon application, road salt reacts with the accumulated snow or ice to form brine equilibrium solutions along the liquidus line in the salt-water system. Dissolved salts dissociate, leading to increased concentrations of the respective ions in nearby soils, surface water, and groundwater. Of the ions present in road salt, chloride has the advantage of tracking all chloride deicers at the same time and since chloride ions are conservative tracers in soils it stays unaffected by ionic exchange interferences. This study explores the mechanisms of chloride return flows by investigating chloride dissolved loads, chloride concentrations in stream waters, seasonal patterns, and changes over the course of four years in two separate watersheds in Massachusetts with differing degrees of urbanization. The chloride tracking technique used in this study is based on calibrated chloride concentrations obtained from specific conductance signals recorded every 15 minutes by automatic recording systems at two locations, one in rural central Massachusetts and the other in urban eastern Massachusetts. These systems are maintained by the USGS, which also provide the simultaneously recorded stream flow datasets. The dissolved chloride load carried by each river is calculated for each single 15-minute interval by multiplying water volume with the corresponding chloride concentration, resulting in a total of over 34,000 data points per annum per site. Hydrograph separation techniques were used to separate dissolved load transported by each river into two separate flow components, event flow resulting from precipitation events, and baseflow resulting from groundwater discharge. Well defined hydrograph baseflow supported periods yield consistent chloride concentrations independent of the season at either urban or rural study sites. Comparison of direct runoff dissolved chloride loads with the total annual dissolved loads suggests that only a small fraction of the deicers actually removed during the overland runoff events and that a minimum of 60% of the total load discharged each year in both urban and rural systems is transported by groundwater. From groundwater recharge by brines rural watersheds are currently retaining as much as 95% of the total chloride applied to roadways each year while urban and suburban watersheds may only retain 75% of the total chloride applied to roadways each year. The increased retention of chloride in rural areas is likely due to the decreased amount of chloride transported during winter seasons as event flow compared to urban watersheds
Thesis (MS) — Boston College, 2009
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Geology and Geophysics
Persson, Kajsa. "High temperature corrosion on heat exchanger material exposed to alkali salt deposits." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-104121.
Повний текст джерелаAl-Saleh, N. "A salt gradient solar pond for heat collection and long term storage." Thesis, University of Sussex, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375133.
Повний текст джерелаAlm, David Michael. "Comparison and interaction of heat and salt stress in cultured tobacco cells." Virtual Press, 1986. http://liblink.bsu.edu/uhtbin/catkey/445616.
Повний текст джерелаFrench, Jonathan Rupert. "Hydrodynamics and sedimentation in a macro-tidal salt marsh, Norfolk, England." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235907.
Повний текст джерелаHlubek, Nikolai. "Magnetic heat transport in one-dimensional quantum antiferromagnets." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-70187.
Повний текст джерелаJeong, Taehee. "Spin-dependent heat transport and thermal boundary resistance." Research Showcase @ CMU, 2011. http://repository.cmu.edu/dissertations/66.
Повний текст джерелаSulistyo, Hary. "Axial and radial heat transport in packed beds." Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293824.
Повний текст джерелаRaju, Mandhapati P. "HEAT AND MASS TRANSPORT INSIDE A CANDLE WICK." Case Western Reserve University School of Graduate Studies / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=case1157564736.
Повний текст джерелаHamed, Myriam. "Electron heat transport in tokamak H-mode pedestals." Electronic Thesis or Diss., Aix-Marseille, 2019. http://theses.univ-amu.fr.lama.univ-amu.fr/191128_HAMED_534gjvrc761ijwn176jbu525de_TH.pdf.
Повний текст джерелаIn H-mode plasmas, the modeling of the pedestal dynamics is an important issue to predict temperature and density profiles in the tokamak edge and therefore in the core. The EPED model, based on the stability of large scales MagnetoHydroDynamic (MHD) modes, is most commonly used to characterize the pedestal region. The EPED model has been successful until now. However, EPED model does not take into account small scales instabilities linked the the sharp pressure gradient and the pedestal characteristics prediction in terms of width and height is still open. Moreover, some recent analysis of JET plasmas suggest that another class of instabilities, called microtearing modes, may be responsible for electron heat transport in the pedestal, and thereby play some role in determining the pedestal characteristics. Microtearing modes belong to a class of instabilities where a modification of the magnetic field line topology is induced at the ion Larmor radius scale. This leads to the formation of magnetic islands, which can enhance the electron heat transport. The stability of MTMs has been theoretically studied in the past showing that a slab current sheet is stable in the absence of collisions. In contrast, recent gyrokinetic simulations in toroidal geometry found unstable MTMs, even at low collisionality. The purpose of our work is to improve the MTM stability understanding by comparing new analytical theory to linear gyrokinetic simulations. More precisely, physical mechanisms (magnetic drift, electric potential) are progressively included in the analytical description to recover the numerical simulations results and to "reconcile" numerical MTM investigations with theory
Fleming, Laura Elizabeth. "The Influence of heat transport on Arctic amplification." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122324.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 53-58).
The Arctic surface air temperature has warmed nearly twice as much as the global mean since the mid-20th century. Arctic sea ice has also been declining rapidly in recent decades. There is still discussion about how much of this Arctic amplification is caused by local factors, such as changes in surface albedo, versus remote factors, such as changes in heat transport from the midlatitudes. This thesis focuses mainly on the role of poleward heat transport on Arctic amplification. Most of the previous studies on this topic have defined ocean heat transport as the zonally averaged ocean heat transport at 65°N or 70°N, which ignores the physical pathways of heat into the Arctic and may include recirculation of heat in the North Atlantic. In this thesis, we define the ocean heat transport as the heat transport across five sections surrounding the Arctic, to create a closed domain in the Arctic.
Previous studies on Arctic amplification have used either a single model run or have compared results from a multi-model ensemble. While the multi-model ensemble approach may potentially average out biases in individual models, the ensemble spread confounds the model differences and the internal climate variability. In this thesis, we investigate the Arctic amplification in the Community Earth System Model version 1 (CESMi) Large Ensemble. The CESMI Large Ensemble includes 40 members that use the same model and external forcing, but different initializations. This simulates different climate trajectories that can occur in a given atmosphere-ocean-land-cryosphere system. We find that CESMI Large Ensemble projects a large increase towards the end of the 21st century in ocean heat transport into the Arctic, and that the increase in ocean heat transport is significantly correlated with Arctic amplification.
The main contributor to the increase in ocean heat transport is the increase across the Barents Sea Opening. The increase in Barents Sea Opening ocean heat transport is highly correlated with the decrease in sea ice in the Barents-Kara Sea region. We propose that this is because the increase in ocean heat transport melts the ice at the sea ice margin, which results in increased surface heat flux from the ocean and further local feedback through decreased surface albedo and increased cloud coverage. We also find that while the changes in atmosphere heat transport into the Arctic circle at 66.5 N are on the same order as the changes in ocean heat transport, they are not correlated with Arctic amplification.
by Laura Elizabeth Fleming.
S.M.
S.M. Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution)
BAIOCCHI, BENEDETTA. "UNDERSTANDING AND PREDICTING ION HEAT TRANSPORT IN TOKAMAKS." Doctoral thesis, Università degli Studi di Milano, 2012. http://hdl.handle.net/2434/170629.
Повний текст джерелаYao, Xiaobo. "Characterization of fire induced flow transport along ceilings using salt-water modeling." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3491.
Повний текст джерелаThesis research directed by: Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Ramsay, Scott Wilson. "Studies on an Arabidopsis MYB transcription factor involved in heat and salt tolerance." Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/8117/.
Повний текст джерелаGreen, Andrew J. "Heat Transfer from Optically Excited Gold Nanostructures into Water, Sugar, and Salt Solutions." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1376498592.
Повний текст джерелаBenjamin, Daniel. "Thermal transport and photo-induced charge transport in graphene." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42746.
Повний текст джерела