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Dissertations / Theses on the topic 'Deposition-precipitation'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Dissanayake, Nishantha B. "Deposition of titanium dioxide by physical vapor deposition." Ohio : Ohio University, 2003. http://www.ohiolink.edu/etd/view.cgi?ohiou1175020765.

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2

Kavanagh, Andrew John. "Energy deposition in the lower auroral ionosphere through energetic particle precipitation." Thesis, Lancaster University, 2002. http://eprints.lancs.ac.uk/6758/.

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Ground-based imaging and broad beam riometers are used in conjunction with ionospheric radars and satellite instruments to investigate high-energy precipitation in the auroral zone. There are two dominant precipitation regimes in the auroral zone which lead to enhanced high frequency radio absorption; high energy electrons (> keV) from closed field lines, and protons (> MeV) penetrating from the solar wind following solar flares. Much of the work in this thesis uses data from riometers in Fennoscandia to measure the extent and movement of energetic precipitation from both sources. A case study

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3

Trapp, John Michael. "Chemistry of Iron and Other Trace Elements in Trade Wind Aerosols and Precipitation." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_dissertations/323.

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The atmospheric transport of various substances from the continents to the oceans plays an important role in biogeochemical processes. Trace metals, iron in particular is of great interest as its availability regulates the growth of phytoplankton over large areas of the ocean. This dissertation focuses on examining and characterizing the factors that affect the solubility of trace metals in Miami and Barbados aerosols and precipitation, in particular species that could play a role in surface seawater biogeochemistry (Fe and trace metals such as Al, V, Cr, Mn, Cu, Co, Ni, Zn, As, Tl, Ba, Cd, P

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4

Collett, Jeffrey Lee Hoffmann Michael R. Hoffmann Michael R. "Characterization of cloudwater and precipitation chemistry and deposition at elevated sites in central and southern California /." Diss., Pasadena, Calif. : California Institute of Technology, 1989. http://resolver.caltech.edu/CaltechETD:etd-02062007-142411.

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5

Seifried, Christine. "Asphaltene precipitation and deposition from crude oil with CO2 and hydrocarbons : experimental investigation and numerical simulation." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/45663.

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Asphaltenes are the heaviest and most complex components in crude oil. Their precipitation and deposition may cause severe problems during production, transportation and processing of crude oil, hence affecting efficiency and cost of production in both upstream and downstream operations. During crude oil production, asphaltenes can deposit in the pores of reservoir rocks resulting in formation damage. Despite significant research, asphaltene behaviour in different flow regimes remains elusive. This thesis presents an investigation into crude oil asphaltene precipitation and deposition at ambie

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6

Copeland, Stella M. "Plant growth and soil responses to simulated nitrogen deposition and dry season precipitation in a Neotropical savanna." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0025076.

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7

BURATTIN, PAOLO. "Etude de la methode de deposition-precipitation appliquee a la preparation de catalyseurs au nickel supporte sur silice." Paris 6, 1994. http://www.theses.fr/1994PA066332.

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La methode de deposition-precipitation consiste a faire precipiter les precurseurs ioniques d'un metal a la surface d'un support oxyde grace a une basification progressive et homogene de la solution par une base retard (uree). L'etude de l'influence des parametres, duree de precipitation, caracteristiques de la silice, concentration des reactifs (uree, ni(ii), silice) a permis de proposer le mecanisme suivant pour expliquer le phenomene de deposition-precipitation du ni(ii) sur la silice: 1. Formation de germes ou sites de germination heterogene constitues d'un feuillet de phyllosilicate 1:1 d

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8

Couto, Elizabeth da Rocha. "Transformações de SO2 e NO2 na atmosfera da área de influência do Pólo Industrial de Camaçari." reponame:Repositório Institucional da UFBA, 2011. http://www.repositorio.ufba.br/ri/handle/ri/10025.

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272f.<br>Submitted by Ana Hilda Fonseca (anahilda@ufba.br) on 2013-04-03T15:02:31Z No. of bitstreams: 1 TESE DE DOUTORADO_ELIZABETH DA ROCHA COUTO.pdf: 5379213 bytes, checksum: abcb42aa71cfdf41403c0028e4fa7652 (MD5)<br>Approved for entry into archive by Ana Hilda Fonseca(anahilda@ufba.br) on 2013-04-23T15:33:05Z (GMT) No. of bitstreams: 1 TESE DE DOUTORADO_ELIZABETH DA ROCHA COUTO.pdf: 5379213 bytes, checksum: abcb42aa71cfdf41403c0028e4fa7652 (MD5)<br>Made available in DSpace on 2013-04-23T15:33:05Z (GMT). No. of bitstreams: 1 TESE DE DOUTORADO_ELIZABETH DA ROCHA COUTO.pdf: 5379213 bytes, chec

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9

Mourne, Richard William. "Lead-210 as a tracer for acidic deposition in areas of complex topography." Thesis, University of Edinburgh, 1993. http://hdl.handle.net/1842/10602.

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This thesis reports an investigation into methods of determining the long term deposition field for atmospheric aerosols in areas of complex topography using the soil inventories of atmospherically derived radionuclides. Measurements of the radionuclides ²¹⁰Pb, ¹³⁷Cs, ¹³⁴Cs and ⁷Be in vegetation and soil have been made at five mountain locations in northern Britain. A description of the field sampling procedure, sample processing and y-ray analysis is given. Loss-on-ignition experiments to determine the organic fraction of sampled soils were also conducted on selected samples. The presence of

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10

Koh, Pei Yoong. "Deposition and assembly of magnesium hydroxide nanostructures on zeolite 4A surfaces." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37159.

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A deposition - precipitation method was developed to produce magnesium hydroxide / zeolite 4A (Mg(OH)₂ - Z4A) nanocomposites at mild conditions and the effect of processing variables such as precursor concentration, type of base added, and synthesis time on the composition, size, and morphology of the nanocomposite were studied. It was determined that the precursor concentration, basicity, and synthesis time had a significant effect on the composition, size, and morphology of the deposited magnesium hydroxide (Mg(OH)₂) nanostructures. The properties of the Mg(OH)₂ - Z4A such as surface area, p

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11

McGerrigle, David N. "Acid deposition on coniferous foliage at high elevation site in the Laurentian Mountains." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66097.

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12

Kreuger, Jenny. "Pesticides in the environment : atmospheric deposition and transport to surface waters /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5485-9.pdf.

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13

Hansson, Sophia V. "Incorporation and preservation of geochemical fingerprints in peat archives." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-84161.

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The present status of the environment, including environmental problems such as heavy metal accumulation in aquatic and terrestrial ecosystems, is in part the consequence of long-term changes. Cores from peatlands and other natural archives provide us with the potential to study aspects of the atmospheric cycling of elements, such as metal pollutants, on timescales much longer than the decade or two available to us with atmospheric deposition monitoring programs. The past decade especially has seen a rapid increase in interest in the biogeochemical record preserved in peat, particularly as it

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14

Taib, Hariati Materials Science &amp Engineering Faculty of Science UNSW. "Synthesis and electrophoretic deposition of Tin Oxide (SnO2)." Awarded By:University of New South Wales. Materials Science & Engineering, 2009. http://handle.unsw.edu.au/1959.4/44490.

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Submicron tin oxide (SnO2) was obtained from thermal decomposition of tin oxalate (SnC2O4) precipitated at room temperature from amixture of solutions of tin (II) chloride (SnCl2) and oxalic acid (H2C2O4). Aqueous precipitation of SnC2O4 was firstly investigated by parametersvariation of starting material concentrations, addition methods and mixing times. Upon calcination, SnO2 powder tacky and subsequent grinding was found to cause nanosized SnO2 particles to agglomerate into plates. Aqueous??alcohol precipitation was then developed, based on the previously conducted aqueous precipitation St

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15

Franz, Eric. "Parameters affecting deposition of electrostatically-charged aqueous sprays." Connect to resource, 1985. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1201634653.

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16

Gauthier-Manuel, Annie. "L'acidité des pluies et les photooxydants atmosphériques : études récentes en Franche-Comté et la relation avec le dépérissement forestier." Besançon, 1989. http://www.theses.fr/1989BESA2017.

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(. . . ) l'etude quantitative de l'acidite et des principaux constituants des pluies permet de montrer que la pollution n'a pas evolue de facon importante au cours des annees 1970-1980. En troisieme partie les resultats des mesures sur les pluies effectuees pres de besancon de 1967 a 1986 sont repris et montrent une faible variation de l'acidite (. . . )

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17

Lawrence, Cameron Eoin. "Measurement of 222Rn Exhalation Rates and 210Pb Deposition Rates in a Tropical Environment." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16291/.

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This thesis provides the measurements of 222Rn exhalation rates, 210Pb deposition rates and excess 210Pb inventories for locations in and around Ranger Uranium Mine and Jabiru located within Kakadu National Park, Australia. Radon-222 is part of the natural 238U series decay chain and the only gas to be found in the series under normal conditions. Part of the natural redistribution of 222Rn in the environment is a portion exhales from the ground and disperses into the atmosphere. Here it decays via a series of short-lived progeny, that attach themselves to aerosol particles, to the long lived i

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18

Shi, Yujie. "Réponse des groupes microbiens impliques dans la dynamique de l'azote du sol aux facteurs du changement global et aux incendies." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1254.

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L’impact de l’homme sur l’environnement mondial et sur la diversité et le fonctionnement des écosystèmes terrestres fait l’objet d’une attention croissante. De nombreuses études ont évalué les effets de facteurs du changement global tels sur les processus de cycle de l'azote du sol dans les prairies. Cependant, ces études n'ont pas pris en compte le fait que la modification du régime de précipitations avait également une influence sur le régime de dépôt d'azote. En outre, la réponse du cycle de l'azote dans les sols des prairies à de multiples facteurs du changement global agissant ensemble et

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19

Bridges, K. S. "Deposition processes and their impact on a heavily industrialized region of the northern Czech Republic." Thesis, University of East Anglia, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266752.

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20

Ciotonea, Carmen. "Synthèse et caractérisation de catalyseurs monométalliques et bimétalliques à base de métaux de transition pour les réactions d'hydrogénation chimiosélective." Thesis, Poitiers, 2015. http://www.theses.fr/2015POIT2264/document.

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La préparation de matériaux catalytiques, à base de métaux de transition (Ni, Co, Cu) supportés sur des supports à porosité organisée, performants pour la réaction d’hydrogénation chimiosélective du cinnamaldéhyde, a été étudiée. L’étude peut être divisée en deux parties distinctes, selon la nature du support, silicique ou aluminique. La première partie traite de la dispersion de métaux de transition sur des supports de type SBA-15.Dans le premier chapitre est présentée la préparation des catalyseurs par la méthode IWI-MD (Incipient Wetness Impregnation – Mild Drying). Plusieurs études, afin d

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21

Isikdemir, Ozlem. "Investigation Of 8-year-long Composition Record In The Eastern Mediterranean Precipitation." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607064/index.pdf.

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Measurement of chemical composition of precipitation is important both to understand acidification of terrestrial and aquatic ecosystems and neutralization process in the atmosphere. Such data are scarce in the Mediterranean region. In this study, chemical composition of daily, wet-only, 387 number of rain water samples collected between 1991 and 1999 were investigated to determine levels, temporal variation and long-term trends in concentrations of major ions and trace elements between 1991 and 1999. Samples had already been collected and some of the analysis had been completed. The anions

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22

Júnior, Adonias Ribeiro Franco. "Obtenção de revestimentos dúplex por nitretação a plasma e PVD-TiN em aços ferramenta AISI D2 e AISI H13." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-02102003-114623/.

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No presente trabalho foi avaliado o efeito da microestrutura e da capacidade de suportar carregamento de camadas nitretadas produzidas em aços ferramenta AISI H13 e AISI D2 sobre a aderência e a resistência ao desgaste microabrasivo de revestimentos de TiN-PVD. Em cada um desses aços, foram produzidas camadas nitretadas de diferentes estruturas e espessuras, e foram determinadas experimentalmente as curvas potencial início de formação de camada branca, para a nitretação a 520oC. Para o aço ferramenta AISI H13, o emprego de tempos de pré-tratamento de nitretação mais prolongados ( aproximadamen

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23

"Modeling of asphaltene precipitation and arterial deposition." Thesis, 2010. http://hdl.handle.net/1911/62084.

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The potential problem produced by asphaltene deposition during oil production has motivated the development of several experimental techniques and theoretical models, trying to understand and predict the asphaltene behavior. Despite the work devoted to understanding this subject, asphaltene deposition still represents a challenging unresolved problem. Predicting asphaltene flow assurance issues requires the ability to model phase behavior of asphaltenes as a function of temperature, pressure, and composition. It has been previously shown that the Perturbed Chain form of the Statistical Associa

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24

Hung, Shih-Yi, and 黃士益. "Preparation of Rice Husk Ash-Supported Copper Catalyst by Deposition-Precipitation." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/88841149422956799640.

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碩士<br>國立中央大學<br>化學工程與材料工程研究所<br>91<br>Abstract In this work, rice husk ash (RHA) was used as a catalyst support. RHA-supported copper catalysts (Cu/RHA) were prepared by the deposition-precipitation method. Characterization of the RHA-supported copper catalysts (Cu/RHA) indicates that the formation of the copper hydrosilicate with structural properties similar to the mineral chrysocolla. The thermal decomposition of the copper hydrosilicate starts above 673K. The specific surface area of the calcinated catalysts increases with increasing the copper loading. The dispersion of copper catalyst

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25

Xu, Min-Qing, and 許民慶. "perparation of RHA-Al2O3 binary oxide supported nickel catalyst by deposition-precipitation." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/96288832827180101630.

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26

Hsieh, Ming-Chung, and 謝銘仲. "Characterization of rice husk ash-supported copper catalysts prepared by deposition-precipitation method." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/97211881985065005769.

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碩士<br>國立中央大學<br>化學工程與材料工程研究所<br>90<br>In this work, the rice husk ash (RHA) was used as a catalyst support. The RHA-supported copper catalysts (Cu/RHA) were prepared by the deposition-precipitation technique. The RHA and Cu/RHA catalysts were characterized by inductively coupled plasma-mass spectrometer (ICP- MS), element analysis (EA), inductively coupled plasma-atomic emission spectrometer (ICP-AES), nitrogen adsorption method, X-ray diffraction (XRD), thermogravimetric analyzer (TGA), temperature-programmed reduction (TPR), dissociative adsorption of nitrous oxide, scanning electron microsc

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27

Gonzalez, Rodriguez Doris Lucia. "Modeling of asphaltene precipitation and deposition tendency using the PC-SAFT equation of state." Thesis, 2008. http://hdl.handle.net/1911/22140.

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Asphaltene precipitation and deposition can occur at different stages during petroleum production causing reservoir formation damage and plugging of pipeline and production equipment. Even though asphaltene deposition is a serious production hazard, deposition appears to occur only if precipitation is present. The main motivation of this work is to develop a general model for asphaltene precipitation and to understand the contribution of the surface material to asphaltene deposition. This dissertation presents a study of the effects of temperature, pressure, and composition on asphaltene phase

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28

Ko, Chien-Shen, та 柯建盛. "Kinetics of the CO oxidation of Au/γ-Al2O3 catalysts Prepared by Deposition-precipitation". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/58dssw.

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碩士<br>元智大學<br>化學工程學系<br>92<br>Alumina-supported gold catalysts were prepared by deposition-precipitation method. The preparation parameters investigated include pH, pretreatment , sequence of raw material addition. The Au/γ-Al2O3 prepared at pH >9.5 became very active for CO oxidation above at 213K after a calcination at 573K for 2h. This activity is similar to the 1.5% Au/TiO2 reference catalyst. With a feed of 1% CO+10% O2 in He, almost 90% of the CO was converted at 298K at CO a space velocity of 21,415 μ mole/g-cat/h. Lower CO oxidation activity was observed, when the calcination temperatu

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29

Collett, Jeffrey Lee. "Characterization of cloudwater and precipitation chemistry and deposition at elevated sites in central and southern California." Thesis, 1989. https://thesis.library.caltech.edu/523/1/Collett_jl_1989.pdf.

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NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The chemical composition of cloudwater samples collected in the Sierra Nevada Mountains of central California between 1985 and 1988 was dominated by [...], [...], and [...]. The balance between these three species usually was responsible for determining the cloudwater pH, although inputs of formic and acetic acid also are believed to be important in this regard, particularly for relatively unpolluted samples. The pH of cloudwater sampled in Yosemite National Park, which ranged fr

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30

Collett, Jeffrey Lee Jr. "Characterization of Cloudwater and Precipitation Chemistry and Deposition at Elevated Sites in Central and Southern California." Thesis, 1989. https://thesis.library.caltech.edu/523/3/collett_jl_1989.pdf.

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<p>The chemical composition of cloudwater samples collected in the Sierra Nevada Mountains of central California between 1985 and 1988 was dominated by NH⁺₄, NO⁻₃, and SO²⁻₄. The balance between these three species usually was responsible for determining the cloudwater pH, although inputs of formic and acetic acid also are believed to be important in this regard, particularly for relatively unpolluted samples. The pH of cloudwater sampled in Yosemite National Park, which ranged from 3.8 to 5.2, normally was lower than the pH of samples collected in Sequoia National Park (3.9 to 6.5). Cloudwate

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31

Darabi, Hamed. "Development of a non-isothermal compositional reservoir simulator to model asphaltene precipitation, flocculation, and deposition and remediation." Thesis, 2014. http://hdl.handle.net/2152/24810.

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Asphaltene precipitation, flocculation, and deposition in the reservoir and producing wells cause serious damages to the production equipment and possible failure to develop the reservoirs. From the field production prospective, predicting asphaltene precipitation, flocculation, and deposition in the reservoir and wellbore may avoid high expenditures associated with the reservoir remediation, well intervention techniques, and field production interruption. Since asphaltene precipitation, flocculation, and deposition strongly depend on the pressure, temperature, and composition variations (e.g.

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32

De, Sousa Avila N. F. "Wet and Dry Deposition of Water-soluble Inorganic Ions, in Particular Reactive Nitrogen Species, to Haliburton Forest." Thesis, 2010. http://hdl.handle.net/1807/25548.

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Open and throughfall precipitation samples were collected at Haliburton Forest for a total of nine events from July – November of 2009. The following species were analyzed quantitatively: NO3-, SO42-, Cl-, HCOO-, C2O42-, NH4+, Na+, K+, Ca2+, and Mg2+. Wet deposition inputs to the system were quantified and the sources of wet-deposited species were probed. The throughfall method was employed to quantify inputs to the forest floor and probe canopy-precipitation interactions. Leaf wash samples at three heights aided in the interpretation of throughfall data and allowed for an examination of verti

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33

Σταυρούλη, Νικολέττα. "Συμπεριφορά πυριτικών αλάτων σε υδατικό περιβάλλον". Thesis, 2009. http://nemertes.lis.upatras.gr/jspui/handle/10889/1797.

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Η παρουσία αυξημένων συγκεντρώσεων πυριτικών ιόντων στα φυσικά νερά, σε συνδυασμό με την παρουσία δισθενών μεταλλοϊόντων τα οποία βρίσκονται σε σχετικά αυξημένες συγκεντρώσεις στα υπόγεια νερά έχει ως αποτέλεσμα σε συνδυασμό με την αύξηση του pH ή της θερμοκρασίας, να συντελεί στην εναπόθεση του πυριτίου με τη μορφή είτε αλάτων του με μέταλλα όπως το ασβέστιο και το μαγνήσιο είτε με την μορφή κάποιας από τις οξειδικές φάσεις (κρυσταλλικές ή μη). Οι εναποθέσεις αυτές σε μεταλλικές επιφάνειες, (σωληνώσεις, εναλλάκτες θερμότητας, αγωγούς, λέβητες κ.τ.λ.), σε βιομηχανικές μονάδες που χρησιμοποιούν

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34

Al, Qasim Abdulaziz Salem. "Simulation of asphaltene deposition during CO₂ flooding." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-08-3794.

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This Thesis presents the results of phase behavior calculations and simulation of asphaltene precipitation, flocculation, and deposition in five Middle-Eastern wells from different fields, based on a reliable experimental data provided for this purpose. The asphaltene precipitation, flocculation, and deposition have been simulated throughout the primary (pressure depletion), secondary (Waterflooding) and tertiary recovery (CO₂ injection) stages. Asphaltene precipitation becomes a serious problem especially when it causes plugging of the formation, wellbore, or production facilities, which will

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35

Kowalski, Andrew S. "Occult cloudwater deposition to a forest in complex terrain : measurement and interpretation." Thesis, 1996. http://hdl.handle.net/1957/28698.

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Occult deposition is the direct uptake of cloudwater by vegetation that comes into physical contact with wind-driven cloud droplets. This can be a significant pathway for hydrological and chemical fluxes from the atmosphere to some forests. Methods for estimating cloudwater fluxes to forests are reviewed. Previous studies have neglected the fact that cloudwater is not a conservative atmospheric quantity. This invalidates traditional micrometeorological approaches for estimation of cloudwater fluxes to forests. A theory is developed to predict the change in the cloudwater flux with height due t

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