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Статті в журналах з теми "Diffusion timescales"
RAGOT, BRIGITTE R. "Nonlinear particle dynamics in a broadband turbulence wave spectrum." Journal of Plasma Physics 60, no. 2 (September 1998): 299–329. http://dx.doi.org/10.1017/s0022377898006795.
Повний текст джерелаWu, Youjun, Bingjie Han, Younan Li, Edwin Munro, David J. Odde, and Erik E. Griffin. "Rapid diffusion-state switching underlies stable cytoplasmic gradients in the Caenorhabditis elegans zygote." Proceedings of the National Academy of Sciences 115, no. 36 (July 24, 2018): E8440—E8449. http://dx.doi.org/10.1073/pnas.1722162115.
Повний текст джерелаJavanainen, Matti, Hector Martinez-Seara, Christopher V. Kelly, Pavel Jungwirth, and Balázs Fábián. "Anisotropic diffusion of membrane proteins at experimental timescales." Journal of Chemical Physics 155, no. 1 (July 7, 2021): 015102. http://dx.doi.org/10.1063/5.0054973.
Повний текст джерелаBauer, Evan B., and Lars Bildsten. "Polluted White Dwarfs: Mixing Regions and Diffusion Timescales." Astrophysical Journal 872, no. 1 (February 14, 2019): 96. http://dx.doi.org/10.3847/1538-4357/ab0028.
Повний текст джерелаCosta, F., T. Shea, and T. Ubide. "Diffusion chronometry and the timescales of magmatic processes." Nature Reviews Earth & Environment 1, no. 4 (April 2020): 201–14. http://dx.doi.org/10.1038/s43017-020-0038-x.
Повний текст джерелаShevchenko, Ivan I. "LYAPUNOV AND DIFFUSION TIMESCALES IN THE SOLAR NEIGHBORHOOD." Astrophysical Journal 733, no. 1 (May 2, 2011): 39. http://dx.doi.org/10.1088/0004-637x/733/1/39.
Повний текст джерелаBradshaw, Richard W., and Adam J. R. Kent. "The analytical limits of modeling short diffusion timescales." Chemical Geology 466 (September 2017): 667–77. http://dx.doi.org/10.1016/j.chemgeo.2017.07.018.
Повний текст джерелаFallon, John, Phillip G. D. Ward, Linden Parkes, Stuart Oldham, Aurina Arnatkevičiūtė, Alex Fornito, and Ben D. Fulcher. "Timescales of spontaneous fMRI fluctuations relate to structural connectivity in the brain." Network Neuroscience 4, no. 3 (January 2020): 788–806. http://dx.doi.org/10.1162/netn_a_00151.
Повний текст джерелаMadhavi, W. A. Monika, Samantha Weerasinghe, and Konstantin I. Momot. "Effects of Hydrogen Bonding on the Rotational Dynamics of Water-Like Molecules in Liquids: Insights from Molecular Dynamics Simulations." Australian Journal of Chemistry 73, no. 8 (2020): 734. http://dx.doi.org/10.1071/ch19537.
Повний текст джерелаDuffy, Peter. "Bohm Diffusion and Cosmic-Ray-Modified Shocks." International Astronomical Union Colloquium 142 (1994): 981–83. http://dx.doi.org/10.1017/s0252921100078428.
Повний текст джерелаДисертації з теми "Diffusion timescales"
Fabbro, Gareth Nicholas. "The timescales of magmatic processes prior to a caldera-forming eruption." Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22452/document.
Повний текст джерелаLarge, explosive, caldera-forming eruptions are amongst the most destructive phenomena on the planet, but the processes that allow the large bodies of crystal-poor silicic magma that feed them to assemble in the shallow crust are still poorly understood. Of particular interest is the timescales over which these reservoirs exist prior to eruption. Long storage times—up to 105 y—have previously been estimated using the repose times between eruptions and radiometric dating of crystals found within the eruptive products. However, more recent work modelling diffusion within single crystals has been used to argue that the reservoirs that feed even the largest eruptions are assembled over much shorter periods—101–102 y. In order to address this question, I studied the >10km3, 22-ka, dacitic Cape Riva eruption of Santorini, Greece. Over the 18 ky preceding the Cape Riva eruption a series of dacitic lava dome and coulées were erupted, and these lavas are interspersed with occasional dacitic pumice fall deposits (the Therasia dome complex). These dacites have similar major element contents to the dacite that was erupted during the Cape Riva eruption, and have previously been described as “precursory leaks” from the growing Cape Riva magma reservoir. However, the Cape Riva magma is depleted in incompatible elements (such as K, Zr, La, Ce) relative to the Therasia magma, as are the plagioclase crystals in the respective magmas. This difference cannot be explained using shallow processes such as fractional crystallisation or crustal assimilation, which suggests that the Cape Riva and Therasia magmas are separate batches. Furthermore, there is evidence that the Therasia dacites were not fed from a long-lived, melt-dominated reservoir. There are non-systematic variations in melt composition, plagioclase rim compositions, and plagioclase textures throughout the sequence. In addition, high-temperature residence times of plagioclase and orthopyroxene crystals from the Therasia dacites estimated using diffusion chronometry are 101–102 y. This is short compared to the average time between eruptions (1,500 y), which suggests the crystals in each lava grew only shortly before eruption. The different incompatible element contents of the Cape Riva and Therasia magmas and plagioclase crystals suggest that a new batch of incompatible-depleted silicic magma arrived in the shallow volcanic plumbing system shortly before the Cape Riva eruption. This influx must have taken place after the last Therasia eruption, which 40Ar/39Ar dates show occurred less than 2,800±1,400 years before the Cape Riva eruption. The rims of the plagioclase crystals found in the Cape Riva dacite are in equilibrium with a rhyodacite, with a similar composition to the Cape Riva glass. However, the major and trace element zoning patterns of the crystals record variations in the melt composition during their growth. The compositions at the centre of most crystals are the same as the rims; however, these crystals are often partially resorbed and overgrown by more calcic plagioclase. The plagioclase then grades normally back to rim compositions. This cycle is repeated up to three times. The tight relationships between the anorthite, Sr and Ti contents of the different zones suggests that the composition of the plagioclase crystals correlates with the composition of the melt from which theygrew. The different plagioclase compositions correspond to dacitic and rhyodacitic melt compositions. The orthopyroxene crystals reveal a similar sequence, although they only record one cycle. These zoning patterns are interpreted to document the assembly of the Cape Riva reservoir in the shallow crust through the amalgamation of multiple batches of compositionally diverse magma. Models of magnesium diffusion in plagioclase and Fe–Mg interdiffusion in orthopyroxene suggest that this amalgamation took place within 101–102 y of the Cape Riva eruption
Osborn, Timothy J. "Internally-generated variability in some ocean models on decadal to millennial timescales." Thesis, University of East Anglia, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297045.
Повний текст джерелаAmalberti, Julien. "Étude expérimentale du dégazage volcanique." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0001/document.
Повний текст джерелаNoble gas geochemistry is an important tool for constraining the history of the volatile phase during magmatic eruptions. Degassing processes control the gas flux from liquid to bubble, leading to solubility- or kinetic-control of the fractionation mechanisms. Noble gases have no chemical interactions at magmatic conditions and are therefore well adapted to tracing gas fractionation mechanisms during the evolution of the gas phase. Well constrained diffusion coefficients, and their dependence on temperature, of several noble gases are critical for estimating the timescale of a plinian eruption, for example. During the quench phase of the lava ejected in the plume, atmospheric noble gases will diffuse through the liquid/glass shell surrounding gas bubbles. Diffusion of these atmospheric gases determine the gas content measured in the eruption products, which are therefore a function of the timescale of the eruption, the initial and final temperatures, the glass/liquid shell thickness and the cooling rate of the magma. Therefore, it should be possible to calculate plinian eruption timescales from noble gas fractionation patterns trapped in pumice. However, in order to perform the diffusion calculations, it is first necessary to model the diffusive system: a numerical resolution of the diffusion equations for hollow sphere geometry is required as there are no analytical solutions (for complex thermal histories such as for a plinian ash column). In order to constrain the diffusion mechanisms (He, Ne and Ar) in silicate glasses and liquids, several synthetic basaltic glasses were produced. Diffusion coefficients were measured from low temperatures (423 K) to the Tg (glass transition temperature) of the system (1005 K). These experiments allowed us to investigate the physical processes that limit diffusion in glassy media: He, Ne and Ar diffusion in silicate glasses show non-Arrhenian behavior as the Tg is approached thought to be due to structural relaxation of the silicate network itself. Complementary diffusion experiments (on He and Ar) at super-liquidus conditions (1673 K and 1823 K) provide important information on the temperature dependency of He/Ar fractionation in silicate liquids. These diffusion measurements required that a new experimental protocol was developed in order to investigate noble gas diffusivities in silicate melts. The results show that relative He and Ar diffusion (i.e. DHe/DAr) decreases with temperature, from 165 at temperatures close to the Tg to 3.2 at high (>1823K) temperature. The measured coefficient diffusions are incorporated to a numerical model of the diffusion equations for a hollow sphere geometry that were developed as a MatLab code as part of this thesis work. This enabled us to determine the likely timescales of plinian eruptions from existing noble gas measurements. These results also have important implications for mechanisms of degassing in basaltic magmas: previous work used diffusivities measured on glasses in order to extrapolate to noble gas diffusivities at magmatic temperatures. Our measurements show that kinetic fractionation of noble gases during degassing of basaltic magmas has likely been overstated because noble gas diffusion in the glass cannot be extrapolated to the liquid state
"Timescales and Characteristics of Magma Generation in Earth and Exoplanets." Doctoral diss., 2020. http://hdl.handle.net/2286/R.I.62649.
Повний текст джерелаDissertation/Thesis
Doctoral Dissertation Geological Sciences 2020
Sundermeyer, Caren. "Composition and compositional zoning of olivine as a tracer for pre-eruptive magmatic processes: Application to Piton de la Fournaise, Laacher See, and Shiveluch volcano." Doctoral thesis, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-1456-4.
Повний текст джерелаIovine, Raffaella Silvia. "Source and magmatic evolution of the Neapolitan volcanoes through time (Southern Italy)." Doctoral thesis, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E634-E.
Повний текст джерелаShapiro, Ian Ross McKay. "Observation of Single-Molecule Rotational Diffusion at Microsecond Timescale by Polarized Fluorescence Correlation Spectroscopy." Thesis, 2009. https://thesis.library.caltech.edu/2467/1/Ian_Shapiro_PhD_thesis.pdf.
Повний текст джерелаThis work presents a series of experimental and numerical studies of macromolecular organic, inorganic and biological structures, in all instances focusing on the behavior characteristic of individual discrete molecular elements. Chapters 1 and 2, beginning on pages 1 and 31, respectively, describe fabrication, use and numerical analysis of of single-walled carbon nanotube probes for amplitude-modulation atomic force microscopy. These studies reach the conclusion that the molecular structure and nanoscale surface interaction potential unique to carbon nanotubes collectively give rise to atomic force microscopy imaging artifacts manifesting as apparent lateral topographic resolution significantly better than that predicted by the probe and sample structures.
Chapter 3 (p. 61) presents a brief review of single-molecule microscopy, describes a generalized mathematical formalism for focusing polarized visible-spectrum electromagnetic radiation, and delineates the construction of a custom two-channel scanning confocal fluorescence microscope system with single-photon detection capability for spectral- and polarization-resolved studies of individual mobile fluorophores. This Chapter includes a theory-based optical analysis of the confocal probe volume structure and photoluminescence collection efficiency from 3D-polarized single-dipole emitters. The latter analysis was aided by introducing a modified Jones formalism using non-square matrix representation for polarization state changes in the specific context of confocal optics. Proper calculation of the expected confocal probe volume dimensions was essential for accurately interpreting experimental data in the following chapter. Additionally, the quantitative understanding that followed from analysis of 3D polarization state measurement by orthogonally polarized detection channels was critical to both the interpretation of experimental data and the numerical generation of simulated data in Chapter 5.
Chapter 4 (p. 125) presents a generalized formalism for correlation analysis of the fluorescence signal collected using the two-channel microscopy system described in Chapter 3. Particular focus was directed toward the theoretical auto- and cross-correlation traces anticipated from polarization-sensitive bivariate time series of photoluminescence emission from freely-rotating transition dipoles. Chapter 4 also presents population-resolved data collected from single F¨orster resonance energy transfer fluorphore pairs conjugated to DNA oligomers as they undergo cleavage by restriction endonucleases. The endonuclease enzyme Michaelis constants KM measured for EcoRI and BglI via fluorescence burst analysis were in agreement with prior literature. The success of these experiments provide concrete confirmation of the microscope’s fluorescence emission sensitivity and detection channel selectivity in the context of single-molecule experiments.
Chapter 5 describes a polarized fluorescence correlation spectroscopy (PFCS) investigation of liquid phase rotational diffusion by colloidal CdSe semiconductor nanocrystals possessing two-dimensional nondegenerate photoluminescence transition dipoles, as well as red fluorescent protein (monomeric DsRed) and rhodamine-labeled phospholipids that possess more conventional one-dimensional fluorescence transition dipoles. The experimental PFCS data collected from these samples is in close agreement with simulated PFCS data produced by a Monte Carlo rotational diffusion numerical routine that incorporates the microscope 3D polarization state sensitivity calculated in Chapter 3.
Appendices beginning on page 221 include a matrix-based description of arbitrary 3D rotation that was used in the rotational diffusion simulations, Matlab code transcripts (p. 227), and an additional mathematical formalism based on information theoretic precepts (p. 242) for assessing directed causal relationships in bivariate time series data.
"Diffusion of oxygen and lithium isotopes at a contact between the Bushveld Complex and metasedimentary rock: Implications for the timescale of Phepane Dome diapirism." UNIVERSITY OF MARYLAND, COLLEGE PARK, 2009. http://pqdtopen.proquest.com/#viewpdf?dispub=1465548.
Повний текст джерелаSoares, Cíntia Dalila. "Évolution dans des populations structurées en classes." Thèse, 2019. http://hdl.handle.net/1866/22666.
Повний текст джерелаКниги з теми "Diffusion timescales"
Furst, Eric M., and Todd M. Squires. Light scattering microrheology. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199655205.003.0005.
Повний текст джерелаЧастини книг з теми "Diffusion timescales"
Shevchenko, Ivan I. "Diffusion Timescales." In Astrophysics and Space Science Library, 77–94. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-52144-8_4.
Повний текст джерелаVan Orman, James A., and Alberto E. Saal. "Diffusion Constraints on Rates of Melt Production in the Mantle." In Timescales of Magmatic Processes, 52–67. Chichester, UK: John Wiley & Sons, Ltd, 2010. http://dx.doi.org/10.1002/9781444328509.ch2.
Повний текст джерелаТези доповідей конференцій з теми "Diffusion timescales"
Irgen-Gioro, Shawn, Yue Wu, Albert F. Vong, and Emily A. Weiss. "Spectral Diffusion and Blinking Timescales In Semiconductor Nanoplatelets." In Physical Chemistry of Semiconductor Materials and Interfaces XX, edited by Daniel Congreve, Christian Nielsen, Andrew J. Musser, and Derya Baran. SPIE, 2021. http://dx.doi.org/10.1117/12.2594776.
Повний текст джерелаCherniak, Daniele J. "DIFFUSION IN ACCESSORY MINERALS AND CONSTRAINTS ON TIMESCALES OF GEOLOGIC PROCESSES." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-318476.
Повний текст джерелаManikantachari, K. R. V., Scott Martin, Ramees K. Rahman, Carlos Velez, and Subith Vasu. "A General Study of Counterflow Diffusion Flames for Supercritical CO2 Mixtures." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90332.
Повний текст джерелаChakraborty, Sumit, Dennis Berkels, and Thomas Fockenberg. "LIFETIME OF PHASES VS. LIFETIME OF CRYSTALS – AN UPPER LIMIT TO TIMESCALES ACCESSIBLE BY DIFFUSION CHRONOMETRY." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-321764.
Повний текст джерелаBroadwell, Kirkland, Michele Locatelli, Mark Caddick, and Philippe Agard. "TIMESCALES OF TRANSIENT BRITTLE DEFORMATION IN SUBDUCTING SLABS: CONSTRAINTS FROM DIFFUSION MODELING FROM THE MONVISO OPHIOLITE." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-322563.
Повний текст джерелаMetcalfe, Abigail, Séverine Moune, and Jean-Christophe Komorowski. "Controls on Eruption Style at La Soufrière de Guadeloupe from Melt Inclusions and Mineral Diffusion Timescales." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.7825.
Повний текст джерелаHanger, Brendan Joseph, Michael C. Jollands, Michael C. Jollands, Greg M. Yaxley, Greg M. Yaxley, Jörg Hermann, and Jörg Hermann. "SHORT TIMESCALES BETWEEN MANTLE METASOMATISM AND KIMBERLITE ASCENT AS INDICATED BY DIFFUSION PROFILES IN GARNET CRYSTALS FROM SOUTH AFRICAN PERIDOTITE XENOLITHS." In Joint 53rd Annual South-Central/53rd North-Central/71st Rocky Mtn GSA Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019sc-327697.
Повний текст джерелаLi, Guanchen, and Michael R. von Spakovsky. "Study of the Transient Behavior and Microstructure Degradation of a SOFC Cathode Using an Oxygen Reduction Model Based on Steepest-Entropy-Ascent Quantum Thermodynamics." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53726.
Повний текст джерелаAriyaratne, C., F. Wang, S. He, and A. E. Vardy. "Use of Hot-Film Anemometry for Wall Shear Stress Measurements in Unsteady Flows." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22674.
Повний текст джерелаRout, Smruti Sourav, Gerhard Wörner, and Wencke Wegner. "Correlation of Ba-zonation and corresponding diffusion timescales indicate a heat pulse-dominated storage regime: A study of sanidines from the 33 ka eruption of Taapaca volcano (Central Andes)." In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.10156.
Повний текст джерела