Academic literature on the topic 'Oxygen diffusivity'
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Journal articles on the topic "Oxygen diffusivity"
Potuček, F., and J. Stejskal. "Oxygen diffusivity in Ellis liquids." Chemical Engineering Science 42, no. 11 (1987): 2793–95. http://dx.doi.org/10.1016/0009-2509(87)87034-3.
Full textBörgers, Jacqueline M., and Roger A. De Souza. "The surprisingly high activation barrier for oxygen-vacancy migration in oxygen-excess manganite perovskites." Physical Chemistry Chemical Physics 22, no. 25 (2020): 14329–39. http://dx.doi.org/10.1039/d0cp01281e.
Full textHashiguchi, Minako, Isao Sakaguchi, Reona Miyazaki, Kazunori Takada, and Naoki Ohashi. "Cobalt Doping as the Controlling Factor of Oxygen Diffusivity in ZnO by More than Four Orders of Magnitude." Defect and Diffusion Forum 363 (May 2015): 85–90. http://dx.doi.org/10.4028/www.scientific.net/ddf.363.85.
Full textChiu, Z. C., M. Y. Chen, D. J. Lee, S. T. L. Tay, J. H. Tay, and K. Y. Show. "Diffusivity of oxygen in aerobic granules." Biotechnology and Bioengineering 94, no. 3 (June 20, 2006): 505–13. http://dx.doi.org/10.1002/bit.20862.
Full textZhao, Wei, Ying Zhang, Yang Liu, Mingqian Tan, Weiting Yu, Hongguo Xie, Ying Ma, et al. "Oxygen diffusivity in alginate/chitosan microcapsules." Journal of Chemical Technology & Biotechnology 88, no. 3 (June 6, 2012): 449–55. http://dx.doi.org/10.1002/jctb.3845.
Full textHan, R., X. Jin, and C. J. Glover. "Oxygen Diffusivity in Asphalts and Mastics." Petroleum Science and Technology 31, no. 15 (August 3, 2013): 1563–73. http://dx.doi.org/10.1080/10916466.2011.559506.
Full textValle-Guadarrama, Salvador, Teodoro Espinosa-Solares, Crescenciano Saucedo-Veloz, and Cecilia B. Peña-Valdivia. "Oxygen Diffusivity in Avocado Fruit Tissue." Biosystems Engineering 92, no. 2 (October 2005): 197–206. http://dx.doi.org/10.1016/j.biosystemseng.2005.06.001.
Full textKobayashi, Kazusuke, and Keizoh Shuttoh. "Oxygen diffusivity of various cementitious materials." Cement and Concrete Research 21, no. 2-3 (March 1991): 273–84. http://dx.doi.org/10.1016/0008-8846(91)90009-7.
Full textXIAO, BOQI, QIWEN HUANG, BOMING YU, GONGBO LONG, and HANXIN CHEN. "A FRACTAL MODEL FOR PREDICTING OXYGEN EFFECTIVE DIFFUSIVITY OF POROUS MEDIA WITH ROUGH SURFACES UNDER DRY AND WET CONDITIONS." Fractals 29, no. 03 (March 24, 2021): 2150076. http://dx.doi.org/10.1142/s0218348x21500766.
Full textClair, Todd P. St, Jill M. Restad, and S. Ted Oyama. "Oxygen diffusivity in MoO3 as determined by a temperature programmed method." Journal of Materials Research 13, no. 6 (June 1998): 1430–33. http://dx.doi.org/10.1557/jmr.1998.0204.
Full textDissertations / Theses on the topic "Oxygen diffusivity"
Prillieux, Aurélien. "Hydrogen and water vapour effects on oxygen solubility and diffusivity in high temperature Fe-Ni alloys." Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/18676/1/PRILLIEUX_Aurelien.pdf.
Full textPareek, Mamta School of Biological Earth & Environmental Sciences UNSW. "Structure and role of rhizomorphs of Armillaria luteobubalina." Awarded by:University of New South Wales. School of Biological, Earth and Environmental Sciences, 2006. http://handle.unsw.edu.au/1959.4/24353.
Full textGiannattasio, Armando. "Interaction of oxygen and nitrogen impurities with dislocations in silicon single-crystals." Thesis, University of Oxford, 2004. http://ora.ox.ac.uk/objects/uuid:41cf8568-8411-4a85-8788-7d390307c7c3.
Full textBoumaaza, Mouna. "Experimental investigation of gas diffusivity and CO2-binding capacity of cementitious materials." Thesis, La Rochelle, 2020. https://tel.archives-ouvertes.fr/tel-03285120.
Full textThe current standardized methods used to investigate the carbonation performance of concrete are based on the direct determination of the pH variation on the surface of a concrete specimen exposed to ambient or higher CO2 concentration. These methods are either time-consuming (natural carbonation) or of a questionable accuracy (accelerated carbonation). The carbonation physicochemical process involves two major mechanisms: gaseous CO2 diffusion into the cementitious material’s porous network and its dissolution and reaction with CaO of the hardened cement paste. Most carbonation depth prediction models require the CO2-effective diffusion coefficient and the amount of carbonatable products as input parameters. Hence the aim of this work is to develop two simple and reliable test methods to determine these two properties in a reliable and cost-effective manner.First we developed and validated a test method to determine the oxygen-effective diffusion coefficient (De,O2) of nine different hardened cement pastes preconditioned at different relative humidity levels, and 44 concrete mixtures. The influence of the hydration duration, water-per-binder ratio, accelerated carbonation, and binder type on the oxygen diffusivity was investigated. The dependence of the De,O2 on the tested concrete specimen thickness was investigated at the dry state and after conditioning at 93%RH. The De,O2 was determined before and after full carbonation of six concrete mixtures previously conditioned at different RH. A correlation between oxygen permeability and diffusivity is investigated on 44 concrete mixtures.A second test method is developed to determine the instantaneous CO2 binding rate and the amount of carbonatable products of powdered hydrated cement pastes and synthetic anhydrous and hydrates. The samples were carbonated in open systems at ambient CO2 concentration and controlled relative humidity, and then the system switches into a closed configuration while the measurement of the CO2-uptake is performed over a short period of time. The test method allows for the measurement of the carbonation reaction rate and capacity; and their evolution as function of time under different RH. The developed method shows advantages for being nondestructive, allowing the samples to carbonate at controlled CO2 concentration and humidity, and providing measurements with low cost equipment. A good agreement between the test method results and thermogravimetric analysis was observed, which highlights the reliability and accuracy of the developed test method.The results obtained from the gaseous diffusion coefficient and carbonatable products test methods were used as inputs for carbonation depth prediction models. A correlation was investigated between the measured carbonation depth on different concrete and hydrated cement pastes mixtures by means of phenolphthalein solution under both natural and accelerated exposure. The results were compared with the calculated carbonation depth using our experimental results
Die zurzeit verwendeten Methoden zur Untersuchung des Karbonatisierungs-widerstandes von Beton basieren auf der direkten Bestimmung des pH-Wertes der oberflächennahen Betonrandzone, die zuvor einer bestimmten Prüflagerung ausgesetzt war (relative Luftfeuchte, spezifische CO2-Konzentrationen). Diese Methoden sind jedoch entweder sehr zeitaufwändig (natürliche Karbonatisierung) oder von fraglicher Praxisnähe (beschleunigte Karbonatisierung). Der physikalisch-chemische Karbonatisierungsprozess beinhaltet zwei Hauptmechanismen: die Diffusion von gasförmigem CO2 in das poröse Netzwerk des Betons und dessen Auflösung und Reaktion mit CaO der ausgehärteten Zementsteins. Die meisten Modelle zur Vorhersage der Karbonatisierungstiefe erfordern den effektiven CO2-Diffusionskoeffizienten und die Menge an karbonatisierbarer Masse als Eingabeparameter. Ziel dieser Arbeit ist es, zwei einfache und zuverlässige Testmethoden zu entwickeln, um diese beiden Eigenschaften zuverlässig und kostengünstig zu bestimmen.Nach Entwicklung und Validierung einer geeigneten Testmethode zur Messung von Sauerstoffdiffusionskoeffizienten (De,O2), wurden diese an neun verschiedenen Zementproben gemessen, die bei unterschiedlichen relativen Luftfeuchten vorkonditioniert wurden. Anschließend wurden 44 verschiedene Betonmischungen geprüft. Bei diesen wurde die Hydratationsdauer und der Wasserbindemittelwert variiert. Die Abhängigkeit des Sauerstoffdiffusionskoeffizienten De,O2 von der getesteten Betonprobendicke wurde im trockenen Zustand und nach Konditionierung bei 93% relativer Luftfeuchtigkeit untersucht. Der Sauerstoffkoeffizient De,O2 wurde vor und nach der vollständigen Carbonisierung von sechs Betonmischungen bestimmt, die zuvor bei unterschiedlicher relativer Luftfeuchtigkeit vorkonditioniert worden waren. Eine zweite Testmethode wurde entwickelt, um die momentane CO2-Bindekapazität und die Menge an karbonatisierbarer Masse aus pulverförmigen Zementhydratpasten und synthetischen wasserfreien Produkten und Hydraten zu bestimmen. Die Proben wurden zunächst in offenen Systemen bei einer CO2-Konzentration in der Umgebung und einer kontrollierten relativen Luftfeuchtigkeit gegeben, um danach dann in eine geschlossene Konfiguration umzuwechseln. So konnte man die CO2-Aufnahme über einen kurzen Zeitraum nachverfolgen. Die Testmethode ermöglicht die Messung der Karbonatisierungsreaktionsrate und –kapazität in Abhängigkeit der Zeit unter verschiedenen relativen Luftfeuchten der Umgebungsluft. Es wurde eine gute Übereinstimmung zwischen den Ergebnissen der Testmethode und der thermogravimetrischen Analyse festgestellt, was die Zuverlässigkeit und Genauigkeit der entwickelten Untersuchungsmethodik unterstreicht.Die Ergebnisse beider Tests wurden als Input für Vorhersagemodelle für den zeitabhängigen Karbonatisierungsfortschritt von Beton verwendet. Es wurde eine Korrelation zwischen der gemessenen Karbonatisierungstiefe an verschiedenen Beton- und Zementhydratmischungen mittels Phenolphthaleinlösung untersucht, wobei u. a. Karbonatisierungstiefen bestimmt nach natürlicher Lagerung mit berechneten/vorhergesagten Karbonatisierungstiefen, die mithilfe der vorgestellten Modellierung und Inputdaten aus Test miteinander verglichen wurden
Liu, Richard Yufeng. "Oxygen Transport as a Structure Probe for Amorphous Polymeric Systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=case1103694304.
Full textRambaks, Andris, Filipp Kratschun, Carsten Flake, Maren Messirek, Katharina Schmitz, and Hubertus Murrenhoff. "Computational approach to the experimental determination of diffusion coefficients for oxygen and nitrogen in hydraulic fluids using the pressure-decay method." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71099.
Full textRen-Chao, Chiou. "Diffusivity of oxygen in aerobic granules." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2307200618280800.
Full textChiou, Ren-Chao, and 邱荏超. "Diffusivity of oxygen in aerobic granules." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/69710127631636589368.
Full text國立臺灣大學
化學工程學研究所
94
The dissolved oxygen (DO) concentration in aerobic granules were measured using microelectrodes, based on which the diffusivity of oxygen was thereby estimated. Considering granules of low bioactivity, the acetate-fed granules of size 1.28-2.50 mm exhibited diffusivity of 1.24-2.28 x10-9 m2 s-1; while phenol-fed granules of size 0.42-0.78 mm had diffusivities of 2.50-7.65 x10-10 m2 s-1. Based on confocal laser scanning microscope testing the interior of granules exhibited layered structure. The steady-state DO concentrations of phenol-fed granule were recorded, showing that oxygen had been depleted in the surface reacting layer of granule. The oxygen diffusivity inside this reacting layer was estimated 1.34-1.82x10-9 m2 s-1 by assuming an mean oxygen concentration. Considering both steady-state and transient DO responses, the acetate-fed granule had diffusivity of oxygen of 0.6-1.3x10-9 m2s-1, while the phenol-fed granules had diffusivity of 2.5-4.6x10-10m2s-1. Both reaction and diffusion limits the oxygen transport in aerobic granules.
Han, Rongbin. "Improvements to a Transport Model of Asphalt Binder Oxidation in Pavements: Pavement Temperature Modeling, Oxygen Diffusivity in Asphalt Binders and Mastics, and Pavement Air Void Characterization." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9284.
Full textBooks on the topic "Oxygen diffusivity"
Experimental thermal conductivity, thermal diffusivity, and specific heat values for mixtures of nitrogen, oxygen, and argon. [Boulder, Colo.]: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1991.
Find full textDongchuan, Wu, Old Dominion University. Research Foundation., and Langley Research Center, eds. Hyperthermal atomic oxygen generator. Norfolk, Va: Old Dominion University Research Foundation, 1990.
Find full textBook chapters on the topic "Oxygen diffusivity"
Lancaster, Jack R. "Reactivity and Diffusivity of Nitrogen Oxides in Mammalian Biology." In Signal Transduction by Reactive Oxygen and Nitrogen Species: Pathways and Chemical Principles, 53–79. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/0-306-48412-9_4.
Full textCerofolini, G. F., G. La Bruna, and L. Meda. "Anomalous oxygen diffusivity and the early stages of silicon oxidation." In C,H,N and O in Si and Characterization and Simulation of Materials and Processes, 104–7. Elsevier, 1996. http://dx.doi.org/10.1016/b978-0-444-82413-4.50028-7.
Full textConference papers on the topic "Oxygen diffusivity"
Yuan, Tai-Yi, Alicia R. Jackson, Chun-Yuh Huang, and Weiyong Gu. "Strain Dependent Oxygen Diffusivity in Bovine Annulus Fibrosus." In ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-192842.
Full textHorita, Teruhisa. "Coating of SOFC Metallic Interconnects and Their Oxygen Diffusivity." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33254.
Full textIwasaki, Daigo, Yoshio Utaka, Yutaka Tasaki, and Shixue Wang. "Oxygen Diffusion Characteristics of Gas Diffusion Layers With Moisture." In ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2008. http://dx.doi.org/10.1115/icnmm2008-62106.
Full textWu, R., X. Zhu, Q. Liao, H. Wang, and Y. D. Ding. "Pore Network Modeling of Oxygen Diffusion in Gas Diffusion Layer of Proton Exchange Membrane Fuel Cells." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18433.
Full textUtaka, Yoshio, and Ikunori Hirose. "Microporous Layer Consisting of Alternating Porous Material With Different Wettability for Controlling Moisture in Gas Diffusion Layer of PEFC." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22197.
Full textShiomi, Takeshi, Richard S. Fu, Ugur Pasaogullari, Yuichiro Tabuchi, Shinichi Miyazaki, Norio Kubo, Kazuhiko Shinohara, Daniel S. Hussey, and David L. Jacobson. "Effect of Liquid Water Saturation on Oxygen Transport in Gas Diffusion Layers of Polymer Electrolyte Fuel Cells." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33225.
Full textHuang, Chun-Yuh, and Wei Yong Gu. "Distribution of Oxygen, Glucose and Lactate in Degenerated Intervertebral Disc." In ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-206557.
Full textKuznetsov, A. V., A. A. Avramenko, and P. Geng. "A Theoretical Prediction of Laminar Falling Plumes in Bioconvection of Oxytactic Bacteria in Porous Media." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45299.
Full textCheng, Chin-Hsien, and Ay Su. "Theoretical Study of Transport Parameters Inside Catalyst Layer of Polymer Electrolyte Fuel Cell." In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33072.
Full textSalek, M., and R. J. Martinuzzi. "Numerical Simulation of Fluid Flow and Oxygen Transport in the Tube Flow Cells Containing Biofilms." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37063.
Full textReports on the topic "Oxygen diffusivity"
Perkins, R. A., and M. T. Ciezkiewicz. Experimental thermal conductivity, thermal diffusivity, and specific heat values for mixtures of nitrogen, oxygen, and argon. Gaithersburg, MD: National Institute of Standards and Technology, 1991. http://dx.doi.org/10.6028/nist.ir.3961.
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