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Dissertations / Theses on the topic 'Activation energy'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Clarke, Christopher. "Concrete shrinkage prediction using maturity and activation energy." College Park, Md.: University of Maryland, 2009. http://hdl.handle.net/1903/9561.

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Thesis (M.S.) -- University of Maryland, College Park, 2009.<br>Thesis research directed by: by Dept. of Civil and Environmental Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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2

Lin, Yawei. "Spectroscopy of High Energy Ion-neutral Collisions." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19720.

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This research work focused on studying the emission spectroscopy produced from the high energy ion-molecule collision processes in mass spectrometry. The collision experiments are described and divided into 4 chapters (Chapter 3, 4, 5, 6).N2O+● is an ion of atmospheric importance. In chapter 3 the investigation of the collision between high translational energy (4-8 keV range) N2O+● ions and Helium target gas in mass spectrometry using collision induced emission (CIE) spectroscopy is described.In chapter 4, the collision-induced emission (CIE) spectra from 4-8 keV collisions between projectile
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3

Bien-Aime, Andre J. "Effect of Cement Chemistry and Properties on Activation Energy." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4439.

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The objective of this work is to examine the effect of cement chemistry and physical properties on activation energy. Research efforts indicated that time dependent concrete properties such as strength, heat evolution, and thermal cracking are predictable through the concept of activation energy. Equivalent age concept, which uses the activation energy is key to such predictions. Furthermore, research has shown that Portland cement concrete properties are affected by particles size distribution, Blaine fineness, mineralogy and chemical composition. In this study, four Portland cements were use
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4

Thridandapani, Raghunath Rao. "The Effect of Microwave Energy on Sintering." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/26864.

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Spent Nuclear Fuel (SNF) is a by-product of existing nuclear reactors; SNF consists of long-lived radioactive actinides which have an average half-life of several thousand years (e.g. Plutonium-239 with a half-life of 24,000 years, and Americium-243 with a half-life of 7,360 years). Several multinational organizations are making an attempt to extract the energetic value out of these nuclear stockpiles in order to minimize the risk of nuclear proliferation and reduce waste volume. The Inert Matrix Fuel (IMF) concept is being considered as an option to reuse the radioactive actinides present in
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5

Fanfarillo, Michael. "Activation of carbon dioxide and dioxygen in low-energy matrices." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236314.

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6

Albright, Eric V. B. "Activation energy of Douglas fir char gasification by carbon dioxide." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-10312009-020158/.

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7

Lasithiotakis, Michail Georgioy. "Irradiated graphite waste - stored energy." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/irradiated-graphite-waste--stored-energy(c93c7581-5273-4d30-a05b-2153b4c7cfaf).html.

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The cores of early UK graphite moderated research and production nuclear fission reactors operated at temperatures below 150°C. Due to this low temperature their core graphite contains significant amounts of stored (Wigner) energy that may be released by heating the graphite above the irradiation temperature. This exothermic behavior has lead to a number of decommissioning issues which are related to long term "safe-storage", reactor core dismantling, graphite waste packaging and the final disposal of this irradiated graphite waste. The release of stored energy can be modeled using kinetic mod
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8

Bevillon, Emile. "Etude théorique du matériau BaSnO₃, en tant que conducteur protonique pour électrolytes de piles à combustible." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2009. http://www.theses.fr/2009ECAP0039/document.

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Les travaux effectués ont consisté en une étude théorique du matériau BaSnO3 en tant que matériau conducteur protonique pour électrolytes de piles à combustible. Ces matériaux sont obtenus après un dopage aliovalent préalable qui génère des lacunes d'oxygène sur le sous-réseau d'oxygène du matériau. Ce matériau, placé en milieu humide va s'hydrater, c'est à dire que des molécules d'eau vont se dissocier au sein du matériau. La propriété principale souhaitée pour de tels matériaux est la conductivité protonique. Celle-ci dépend du nombre de porteurs de charges (les hydrogènes ou protons apporté
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9

Amer, Elhadi M. "Thermal analysis and kinetic studies of the decomposition of some high performance polymers." Thesis, University of Salford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272943.

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10

Mereddy, Sandeep Reddy. "Adaptive algorithms for sensor activation in renewable energy-based sensor systems." Thesis, Wichita State University, 2009. http://hdl.handle.net/10057/2505.

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Future sensor networks would comprise of sensing devices with energy harvesting capabilities from renewable energy sources such as solar power. A key research question in such sensor systems is to maximize the asymptotic event detection probability achieved in the system, in the presence of energy constraints and uncertainties. This thesis focuses on the design of adaptive algorithms for sensor activation in the presence of uncertainty in the event phenomena. Ideas from increase/decrease algorithms used in TCP congestion avoidance are applied to design an online and adaptive activation algorit
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11

Holdich, Jonathan Peter. "Assessment of Gαq-coupled receptor activation using fluorescence resonance energy transfer". Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612154.

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12

Schmidt, Julian C. "PARP Activation, NAD+ Depletion, and Energy Dysregulation following Traumatic Brain Injury." Thesis, The University of Arizona, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=13422970.

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<p> Traumatic brain injury (TBI) is characterized by a sudden concussive (direct force or shock wave) blow to the head, in which traumatic biomechanical forces are transferred throughout the head and neck. Damage to neural tissue occurs due to rapid acceleration and deceleration forces of the brain, culminating upon impact of the brain with the interior of the skull. At the molecular level, TBI generates a host of physiological responses, which manifest in many different ways. The focus of this thesis will be on the trajectory that progresses through 1) brain acceleration forces, 2) force-indu
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13

Brown, Ashley Kaye. "Investigating the Effect of Energy Substrates and LPS-activation on the In Vitro Energy Metabolism of BV-2, RAW264.7 and VM-M3 Cells." Thesis, Boston College, 2016. http://hdl.handle.net/2345/bc-ir:106811.

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Thesis advisor: Thomas N. Seyfried<br>Two major metabolic phenomena observed in cancer cells include the Warburg effect and Crabtree effect. The Crabtree effect is the in vitro inhibition of respiration by glucose. The influence of glucose on the oxygen consumption rate (OCR) and extracellular acidification rate (ECAR) of tumorigenic RAW264.7 and VM-M3 macrophage cells, as well as non-tumorigenic BV-2 microglia cells, was studied using the Seahorse XF96 extracellular flux analyzer. RAW264.7, VM-M3, and BV-2 cells incubated in glucose medium displayed a significantly lower OCR and higher ECAR c
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14

Mitchell, Nathan. "Eyring Activation Energy Analysis of Acetic Anhydride Hydrolysis in Acetonitrile Cosolvent Systems." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etd/3430.

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Acetic anhydride hydrolysis in water is considered a standard reaction for investigating activation energy parameters using cosolvents. Hydrolysis in water/acetonitrile cosolvent is monitored by measuring pH vs. time at temperatures from 15.0 to 40.0 °C and mole fraction of water from 1 to 0.750. This work utilizes a temperature controlled water bath and a Vernier glass-body pH probe with Vernier Logger Pro 3.10.1 software for automated data collection. Data analysis is used to determine observed kinetic rate constants under the assumption that hydrolysis is a pseudo-first-order reaction. Eyri
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15

ZECCA, CHRISTIAN. "Towards the organic actor: neuroplastic training for the dynamic activation of presence energy." Doctoral thesis, Università degli studi di Genova, 2018. http://hdl.handle.net/11567/929875.

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16

Mohammad, Shafiei Adel. "An Energy-Efficient Target Tracking Protocol Using Wireless Sensor Networks." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32384.

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Target tracking using Wireless Sensor Networks (WSNs) has drawn lots of attentions after the recent advances of wireless technologies. Target tracking aims at locating one or several mobile objects and depicting their trajectories over time. The applications of Object Tracking Sensor Networks (OSTNs) include but not limited to environmental and wildlife monitoring, industrial sensing, intrusion detection, access control, traffic monitoring, patient monitoring in the health-related studies and location awareness in the battle eld. One of the most rewarding applications of target tracking is wil
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17

Zeman, Vojtěch. "Kinetika fotochromních reakcí v tenkých polymerních filmech." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216218.

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The thesis is aimed to the study of spiropyrane behavior in polymeric matrix of poly(N-vinylkarbazole) (PVK) and poly[2-methoxy-5-(3´,7´-dimethyloctyloxy)-1,4-fenylenvinylene)] (MDMO-PPV). The photochromic transformation of spiropyrane to its isomeric merocyanine form (SPMC) was studied by absorption and emission spectroscopy. It was found, that photochromic reaction is markedly dependent on the environment. In the PVK polymer, which don’t absorb in the visible region, a high yield of photochromic reaction was achieved. Both, absorption and emission spectrums were observed for this system. Fro
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18

Guangliang, Chen. "The Dissociation of Metalloporphyrin Anions." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32517.

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ESI-MS spectra of Ni(II), Co(III), Mg(III), and Fe(II) porphyrin solutions in methanol show porphyrin monomer species with different charge states, such as [Ni(II)TPPS+H]3-, [Co(III)TPPS]3-, [Mn(III)TPPS]3-, [Mn(III)TPPS+H]2-, [Fe(II)TPPS+H]3-, and [Fe(II)TPPS+2H]2- ions. Collision-induced dissociation (CID) of these monomer species produced primarily losses of neutral SO3 and SO2. The mechanisms, in which these dissociation pathways took place, were investigated by the means of DFT calculations of the corresponding dissociation of neutral and ionized benzenesulfonate (B3-LYP/6-31+G(2d, p) lev
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19

Alexander, Rebecca. "Energy landscape of defects in body-centered cubic metals." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX072/document.

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Les matériaux composants les réacteurs nucléaires subissent des conditions d’irradiationsévères, donnant lieu à des modifications de leurs propriétés mécaniques. Le vieillissement de cesmatériaux soulève des questions aussi importantes que celles liées à la sécurité des centrales existantes etaux futurs réacteurs à fission et à fusion. Dans plusieurs situations les matériaux de structure cristallinecubique centrée CC sont utilisés ayant pour base le fer, le tungstène, le vanadium et le tantale. Lescollisions entre les particules irradiantes et les atomes constituants les matériaux engendrent d
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20

Pena, Jenny Juliana. "Study of chars prepared from biomass wastes : material and energy recovery." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2018. http://www.theses.fr/2018IMTA0104.

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L'objectif de la thèse est d'étudier la valorisation des chars de biomasse. Dans ce contexte de transition énergétique, les biomasses sélectionnées sont les écales de sarrasin et de millet, assez pu étudiées jusqu'à maintenant, produites localement pour contribuer au développement de l'économie circulaire et qui ne compromettent pas une filière de valorisation connue. Dans ce travail, la valorisation matière est abordée à travers la réutilisation de ces résidus dans des procédés d'épuration catalytique de syngaz ou dépuration de biogaz pour lesquels les polluants sont respectivement les goudro
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21

Vancea, Anisoara. "Energy and electron transfer on titania-silica binary oxides." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12152.

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Steady state reflectance and emission characteristics of anthracene adsorbed on silica gel and titania-silica mixed oxides have been investigated as a function of sample loading. Titania-silica mixed oxides with 1, 3, 5 and 10 wt. % TiO2 were prepared by two different methods: a dropwise method and a sol-gel route. Ground state diffuse reflectance and fluorescence emission spectra of anthracene adsorbed on titania-silica surfaces show a dependence on titania content. The absorption peaks of anthracene are difficult to resolve at higher titania content due to the increasing red-shift of the tit
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22

Oparah, Irene A. "Photosynthetic acclimation to temperature of four Eucalyptus species and Sequoia sempervirens." Thesis, University of Canterbury. School of Forestry, 2012. http://hdl.handle.net/10092/7531.

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The 3-PG physiological/mensurational hybrid model is a useful forest management tool capable of producing accurate growth results across a number of parameterised species. The temperature data used in the model are the average maximum and minimum values for photosynthesis above the compensation point (Landsberg and Sands 2011). There is a minimum temperature below which positive net CO₂ exchange will not occur, a maximum temperature above which it will not occur and an optimum temperature at which it is maximised. These parameters are used in the 3-PG physiological model of forest production.
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23

Madakasira, Sreenivas. "Performance analysis of an adaptive algorithm for sensor activation in renewable energy based sensor systems." Thesis, Wichita State University, 2010. http://hdl.handle.net/10057/3698.

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Linear increase-decrease algorithms have applicability in various fields of research. For instance, transmission control protocol (TCP) congestion control mechanism employs an additive increase and multiplicative decrease (AIMD) algorithm to vary the congestion window size dynamically at the sender. Recently, an adaptive algorithm for sensor activation in renewable energy based systems was proposed. This activation algorithm is designed in such a way that the sensor dynamically computes its sleep interval according to additive increase and multiplicative decrease, based on its current energy l
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24

Afolaju, Wasiu ALOWONLE Mr, and SCOTT Dr Dane. "Hydrolysis of Acetic Anhydride in Water/Tetrahydrofuran Co-solvent Systems Using Eyring Activation Energy Analysis." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/asrf/2019/schedule/52.

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This study determines the activation energy parameters for the hydrolysis of acetic anhydride in water/tetrahydrofuran solutions. These values are needed for studies to quantify the effect of the bulk electrostatic environment solvent-solute interactions on the hydrolysis reaction rate. Hydrolysis of an acetic anhydride with water or under basic conditions yields acetic acid. The current study is based on simple hydrolysis of acetic anhydride which produces acetic acid decreasing the pH over time. Simple hydrolysis is monitored by measuring pH versus time at temperatures ranging from 20.0 to 3
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25

Smith, Lori Lyn. "Effectiveness of low energy collisional activation methods for automated peptide sequencing by tandem mass spectrometry." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/280450.

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The relative efficiencies of low energy (< 100 eV) collisional activation techniques were determined for peptide sequencing by tandem mass spectrometry (MS/MS). Tryptic peptides were fragmented using either collision induced dissociation (CID) or surface induced dissociation (SID) to generate spectral databases. Statistical analysis of the resulting fragment ions and success rates for automated peptide sequencing by publicly available algorithms provided a measure of the value of sequencing information content of CID and SID MS/MS spectra. Typical success rates were determined for automated se
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26

Lücken, Jana. "Transformations of Energy-Related Small Molecules at Dinuclear Complexes." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2020. http://hdl.handle.net/21.11130/00-1735-0000-0005-1563-4.

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27

Yang, Yang. "Investigation of vanadium-containing oxide systems : CALPHAD and experiments." Doctoral thesis, KTH, Termodynamisk modellering, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-197292.

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Fundamental studies on thermodynamic properties of vanadium-containing oxides systems are essential to understand practical vanadium metallurgical process. The CALPHAD technique is here applied to the thermodynamic modelling of the V-O, Ca-V-O and Ti-V-O systems. The compound energy formalism is used for all the solution phases. All optimization processes and calculations are performed using the Thermo-Calc software package. The present work attempts to develop a self-consistent thermodynamic database of all phases in the studied systems. The obtained datasets can be used to calculate thermody
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28

Shestakov, A. F. "Telomeres of Tetrafluoroethylene - Advanced Materials to Create Superhydrophobic Coatings and Optical Fiber with Low Attenuation Coefficient." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35479.

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The paper describes formation of telomers of tetrafluoroethylene (TFE), which are very interesting in-termediate materials of different purposes, by radiation polymerization. In some cases there are formed long chained oligomers suitable for creation of superhydrophobic coatings. In such systems formation of gels is observed under low TFE content. Quantum chemical analysis allows to reveal the factors that are responsible for this phenomenon. In the case of solvents with appropriate cyclic structure, short chain oli-gomers, which have low C-H bonds content, are raw materials for fluoropolymers
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29

Lin, Xi. "The Kinetic and Mechanism of The Oxygen Reduction Reaction on Pt, Au, Cu, PtCu/C and CuAu/C in Alkaline Media." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1471874766.

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30

Olowoyo, Samson. "Kinetics and Activation Energy Parameters for Hydrolysis of Acetic Anhydride in a Water-Acetone Cosolvent System." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etd/3409.

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The hydrolysis of acetic anhydride is a widely-studied liquid phase reaction studied since 1906. Different approaches have been used to study the kinetics of this reaction. Approaches used by researchers have involved the use of sophisticated experimental set-ups. In this work, the pH technique has been adopted which involves the use of a pH meter to monitor the hydrolysis reaction. Analysis of the hydrolysis reaction has been performed for water/acetone cosolvent systems over a range of temperatures and mole fractions. Eyring analysis was performed under isomole fraction conditions and activa
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31

Mendiratta, Neeraj K. "Kinetic Studies of Sulfide Mineral Oxidation and Xanthate Adsorption." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/27545.

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Sulfide minerals are a major source of metals; however, certain sulfide minerals, such as pyrite and pyrrhotite, are less desirable. Froth flotation is a commonly used separation technique, which requires the use of several reagents to float and depress different sulfide minerals. Xanthate, a thiol collector, has gained immense usage in sulfide minerals flotation. However, some sulfides are naturally hydrophobic and may float without a collector. Iron sulfides, such as pyrite and pyrrhotite, are few of the most abundant minerals, yet economically insignificant. Their existence with other
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32

Aquino, Fl?via de Medeiros. "S?ntese, caracteriza??o e cin?tica da decomposi??o t?rmica dos materiais cer?micos PrMO3 (M = Ni ou Co)." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12690.

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Made available in DSpace on 2014-12-17T14:06:54Z (GMT). No. of bitstreams: 1 FlaviaMA_DISSERT.pdf: 2525916 bytes, checksum: e66ea09a8c50d8b220412e1d5685d5d1 (MD5) Previous issue date: 2010-03-11<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>In this work have been studied the preparation, characterization and kinetic study of decomposition of the polymerizing agent used in the synthesis under non-isothermal condition ceramics PrMO3 of general formula (M = Co and Ni). These materials were obtained starting from the respective metal nitrates, as a cations source, and making
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33

Kopecký, Jan. "Určení kinetických parametrů reakcí pomocí DSC měření." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378413.

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The master thesis deals with DSC measurments a calculation of kinetic parameters. In the theoretical part, iron alotropy is briefly described, followed by a description of the DSC analysis itself. The thesis also includes division and derivation of isoconversional methods for calculating the activation energy. In the experimental part, a series of measurments is perfomed on pure iron prepared by Cold Spray method. In the paper the influence of deformation on the Curie temperature of the magnetic transformation in -Fe and transformation > is investigated. The activation energy is calculated f
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Ríos, Quiroga Luis Carlos [UNESP]. "Avaliação da relação entre a energia de ativação e a energia útil para diferentes misturas de etanol e gasolina aplicados a motores de ignição por centelha." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/146676.

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Zhang, Hongtu. "Activation of Small Molecule and Organic Substrates by Tris(Phosphinoamide) Zr/Co Heterobimetallic Complexes." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1594900050962052.

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36

Seaton, Robert Leonard. "The influence of temperature and composition on the activation energy for creep in binary aluminum lithium alloys." Thesis, Monterey, California: Naval Postgraduate School, 1990. http://hdl.handle.net/10945/27666.

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Approved for public release; distribution is unlimited.<br>With the fast pace of technology in the aerospace industry, there are increasing demands for higher strength and stiffness in structural materials but with reduced weight and improved formability. Aluminum alloys have been widely used in the construction of aerospace vehicles because of their high strength to weight ratio, forming characteristics and corrosion resistance. An investigation was conducted to determine the temperature and composition dependence on the activation energy for creep of A1-0.5wt.pct.lithium, A1-1.Owt.pct.Li, an
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Seaton, Robert L. "The influence of temperature and composition on the activation energy for creep in binary aluminum lithium alloys." Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA242299.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, December 1990.<br>Thesis Advisor(s): McNelley, Terry R. ; Kalu, Peter N. "December 1990." Description based on title screen as viewed on April 2, 2010. DTIC Identifier(s): Aluminum alloys, lithium, creep, binary alloys, strength weight ratio, stress tests, stress strain relations, microstructure, aerospace craft, isothermal tests, theses. Author(s) subject terms: Temperature, composition, activation energy, creep binary aluminum lithium alloys. Includes bibliographical references (p. 89-90). Also available in print.
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Rai, Chaudhuri Anjana. "Electronic structure and bond energy trends in silicon-hydrogen and germanium-hydrogen bond activation by transition metals." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184731.

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The electronic structure factors that control Si-H and Ge-H bond activation by transition metals are investigated by means of photoelectron spectroscopy. Molecular orbital calculations are also used to gain additional insight into the orbital interactions involved in bond activation. The complexes studied have the general molecular formula (η⁵-C₅R'₅)Mn(CO)(L)HER₃, where R' is H or CH₃, L is CO or PMe₃, E is Si or Ge and R is Ph or Cl. These compounds are interesting models for catalysts in industrial processes like hydrosilation. The compounds display different stages of interaction and "activ
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39

Parks, William. "Force activation of I domain containing and lacking integrins on live cells." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/42695.

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Cellular adhesion plays a crucial role in the biological function of cells, allowing them to communicate and signal, as well as physically anchor, by enabling them to adhere to either other cells or the extra cellular matrix (ECM). This process is regulated by several factors including intrinsic bond kinetics, internal cellular signaling, environment, force exerted on the bond, and force history of the bond. Concerning the force and force history dependence, the observation of catch bonds in integrin binding has asked as more questions than it has answered. To explore the force and force hist
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40

Ekström, Erik. "Effect of texture and blasting pressure on residual stress and surface modifications in wet sand blasted α-Al2O3 coating". Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-122508.

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Recently, wet sand blasting on coated cutting tool inserts has drawn interest to the tooling industry due to its positive effects on cutting performance and tool life. This performance boost has partly been attributed to the buildup of compressive residual stresses in the coating during the blasting process. However, the mechanism of forming residual stresses in ceramic coatings during sand blasting is not fully understood. This work utilize x-ray diffraction as the main tool to study the formation and relaxation of residual stresses after wet sand blasting and annealing on 001, 012 and 110 te
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Zou, Yiming. "The Effect of Various Dopants on Diamond Growth : A Combined Experimental & Theoretical Approach." Doctoral thesis, Uppsala universitet, Institutionen för kemi - Ångström, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-271491.

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Diamond is a unique material with many exceptional properties. It has therefore been proven to be an important material for many applications. Moreover, the introduction of dopant species into the gas phase during the CVD growth process has been shown to strongly influence not only the properties and morphology of diamond, but also the growth rate. The purpose with the theoretical part of the present study has been to support and explain the experimental observations regarding the effect of various dopants (nitrogen, phosphorous, sulphur, and boron) on the diamond growth rate. Commonly observe
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Gudavalli, Ravi Krishna. "Effect of pH and temperature on the carbonate promoted dissolution of sodium meta-autunite." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/773.

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Release of uranium from Na-autunite, an artificial mineral created as a result of polyphosphate injection in the subsurface at the DOE Hanford Site, takes place during slow dissolution of the mineral structure. Stability information of the uranyl-phosphate phases is limited to conditions involving pH, temperature, and a few aqueous organic materials. The carbonate ion, which creates very strong complexes with uranium, is the predominant ion in the groundwater composition. The polyphosphate technology with the formation of autunite was identified as the most feasible remediation strategy to seq
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Demková, Eva. "Polypropylen s řízenou dobou života." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2017. http://www.nusl.cz/ntk/nusl-295673.

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The master´s thesis is focused on the characterization of degradation process of polypropylene and polypropylene with statistic copolymer into which manganese (II) stearate and cobalt (II) stearates were added at 0.05, 0.10 and 0.20 wt.% loadings. The aim of the thesis was to prepare the controlled life-time polypropylene. The degradation was studied at varying temperatures and prodegradant loadings. The prodegradants were synthetized and characterized using the FTIR and DSC techniques. Thermooxidation of the tested samples induced the changes in crystallinity, melting points and melt-flow ind
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Orford, Dennis. "Fry drying and pyrolysis of municipal solid waste." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/207758/1/Dennis_Orford_Thesis.pdf.

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This research investigated sustainable resource recovery from unsorted urban, industrial and agricultural waste using fry drying and pyrolytic distillation process methods. Thermogravimetric analysis and Fourier Transform Infrared Spectroscopy were used to identify and quantify linkages between feedstock composition, process chemistry and likely end products. Distributed activation energy modelling was used as an initial step towards development of an accurate kinetic process model. It was postulated that sequential pyrolytic distillation technology be developed to create circular economies, r
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Nogueira, Paulo Alberto. "Influência da temperatura na dinâmica oscilatória de um sistema químico homogêneo aberto." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-16092011-155351/.

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As reações químicas genericamente referidas como reações de Belousov-Zhabotinsky (BZ) têm sido bastante utilizadas como paradigmas de complexidade em sistemas químicos homogêneos. Apesar dos avanços consideráveis realizados no estudo de tais sistemas, aspectos como o papel do fluxo de reagentes e da temperatura na dinâmica oscilatória ainda são pouco entendidos. O presente trabalho consiste na investigação experimental do efeito destes dois parâmetros em duas variantes da reação de BZ. Após alguns testes iniciais com o sistema bromato/hipofosfito-acetona/manganês-ferroína, a maioria dos experi
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Leiva, Cecilia Rocío Morales. "O emprego da termogravimetria na determinação da energia de ativação no processo de combustão de óleos combustíveis." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-30092005-094638/.

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Neste trabalho, determinou-se a energia de ativação (Ea) no processo de combustão de três óleos combustíveis cedidos pela Petrobrás–Cenpes e denominados por A, B e C. Empregou-se análise termogravimétrica (TG) utilizando um sistema Shimadzu 51H e, para todas as amostras observaram-se três regiões oxidativas distintas identificadas como, oxidação à baixa temperatura (LTO), depósito de combustível (FD) e oxidação à alta temperatura (HTO). As energias de ativação foram determinadas como uma função do grau de conversão ('alfa') e temperatura na região LTO e utilizando-se dois métodos cinéticos, de
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Pourghahramani, Parviz. "Effects of grinding variables on structural changes and energy conversion during mechanical activation using line profile analysis (LPA) /." Luleå : Luleå tekniska universitet/Chemical Engineering and Geosciences/Mineral Processing, 2006. http://epubl.ltu.se/1402-1757/2006/19/index.html.

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Acharya, Ananta R. "Indium Nitride Surface Structure, Desorption Kinetics and Thermal Stability." Digital Archive @ GSU, 2013. http://digitalarchive.gsu.edu/phy_astr_diss/62.

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Unique physical properties such as small effective mass, high electron drift velocities, high electron mobility and small band gap energy make InN a candidate for applications in high-speed microelectronic and optoelectronic devices. The aim of this research is to understand the surface properties, desorption kinetics and thermal stability of InN epilayers that affect the growth processes and determine film quality as well as device performance and life time. We have investigated the structural properties, the surface desorption kinetics, and the thermal stability using Auger electron spectros
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Vargun, Elif. "Polymerization And Characterization Of 2-hydroxyethyl Acrylate." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1225010/index.pdf.

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Poly(2-Hydroxyethyl acrylate), PHEA, is used as hydrophilic polymeric gels which have been studied because of its great importance for agricultural or biomedical applications. Biomedical applications of hydrogels include soft contact lenses, artificial corneas, soft tissue substitutes and burn dressings. In this study, it was aimed to synthesis the polymers with well-defined molecular weights, polydispersities and cahin topologies. Bulk, solution and atom transfer radical polymerization (ATRP) techniques at different temperatures were examined. The polymerization in bulk form was carried in va
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Xu, Juan. "Hydro-dechlorination of Ortho-substituted PCB Congeners Widespread in the Environment: Effects of Triethylamine and Mild Reaction Conditions." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613745571433659.

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