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Dissertations / Theses on the topic 'Electrodes'

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1

Koep, Erik Kenneth. "A Quantitative Determination of Electrode Kinetics using Micropatterned Electrodes." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10524.

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Interfacial polarization resistances limit the performance of many thin film solid-state devices, especially at low temperatures. To improve performance, a fundamental understanding of the electrode kinetics that govern interfacial reaction rates must be developed. The goal of this work is to determine site-specific reaction mechanisms and the relative significance of various reactions in order to quantify optimum structural parameters within the cathode microstructure. Key parameters include the length of triple phase boundary (TPB), the quantity of exposed electrolyte/electrode surface, a
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2

Nwosu, Nkem O. E. "Optimisation of electroless co-deposited solid oxide fuel cell electrodes." Thesis, Edinburgh Napier University, 2013. http://researchrepository.napier.ac.uk/Output/6448.

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Research already carried out on the use of the recently patented electroless nickel ceramic codeposition technique as a method of manufacturing solid oxide fuel cell (SOFC) electrodes has thus far indicated that, while functional electrodes can be manufactured by the technique, for optimum performance of the cell, amplification of the ceramic content of the coatings is still required. By mainly employing external agents such as surface active agents (surfactants) and magnetic fields (in a bid to aid ceramic particle stability), this research focused on the prospect of increasing the ceramic co
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3

Seon, Hongsun 1965. "Electrode erosion and arc stability in transferred arcs with graphite electrodes." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=108637.

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Arc stability and erosion behavior were studied on a hollow graphite DC cathode in an argon atmosphere at atmospheric pressure. It was found that the arc stability is associated with the electron emission mode transition of the cathode operation. Estimation of current densities, SEM pictures, Fast Fourier Transform (FFT) of total voltage, and measurement of cathode surface temperature supported this. Stable arcs are in the thermionic emission regime while unstable arcs in the thermofield emission regime. Higher argon gas flow rate is believed to cause the shift of the mode from the thermofield
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4

Sand, Sara Catherine. "TiO2/CNT Composite Electrodes in Dye-Sensitized Solar Cell Electrodes." Ohio University Honors Tutorial College / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1492721176795399.

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5

Liu, Yong. "Novel nanostructured electrodes." Department of Chemistry - Faculty of Science, 2007. http://ro.uow.edu.au/theses/14.

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Nanotechnology provides an effective and direct way to create novel properties and phenomena through the reduction in material sizes without changing the materials’ chemical composition. A number of routes to the preparation of novel nanostructured electrodes were investigated in this thesis. These involve the formation of nanoporous opaline electrodes, three dimensional nanofibrous networks and the synthesis of flexible nanoelectrodes based on highly dense ordered aligned carbon nanotubes and conducting polymers. Excellent improvements with the use of nanostructures in a wide range of applica
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6

Maxwell, Virginia Margaret. "Ion-selective electrodes." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329972.

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7

Laing, M. E. "Polymer coated electrodes." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238164.

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8

Curran, Dominic. "Electrochemically modified electrodes." Thesis, Queen's University Belfast, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333807.

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9

Al-Lolage, Firas Ahmed Thanon. "Amperometric enzyme electrodes." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/419053/.

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This thesis studies the conditions required to achieve direct electron transfer and the experimental tests needed to unequivocally demonstrate that it occurs. Many publications claim to observe direct electron transfer to redox enzymes (for example in the case of glucose oxidase) but the evidence presented is often incomplete and unconvincing. The first part of this thesis argues that the vast majority, if not all, of these claims of DET for GOx are incorrect. It presents results for glucose oxidase (GOx) adsorbed on multi‐walled carbon nanotubes (MWCNTs), a typical nanostructured GOx electrod
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10

Eloul, Shaltiel. "Diffusion to electrodes." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:88c5f1d0-9f2f-49d5-b46d-6eeb5b7d4bfe.

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This thesis develops diffusion models for modern electrochemical experiments involving the transport of particles to electrodes and adsorbing surfaces. In particular, the models are related to the 'impact' method where particles stochastically arrive at an electrode and detected electrochemically. The studies are carried out using numerical simulations and also analytical methods. Chapter 1 is introductory and outlines some fundamental concepts in mass transport and kinetics, and their relation to electrochemical measurements which are of importance for the reader. Chapter 2 describes the nume
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11

Li, Jian-Wei. "Zeolite-modified electrodes /." [S.l.] : [s.n.], 1993. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

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12

Aixill, W. Joanne. "Electrode processes." Thesis, University of Oxford, 1998. http://ora.ox.ac.uk/objects/uuid:9578fd22-42fe-41cc-9d92-96f8272956d8.

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The work presented in this thesis first characterises a high speed channel flow cell and then applies the system to the electro-reduction of nitromethane in aqueous solution. Potential step transient measurements are carried out with the current-time transients simulated using a model based on the absence of axial diffusion. The excellent agreement between theory and experiment confirms the proposed mass transport model and further demonstrates that the combination of current-time transients recorded using the high speed channel flow cell and numerical simulations provide a powerful tool to ac
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13

Blum, Richard Alan. "An Electronic System for Extracellular Neural Stimulation and Recording." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16192.

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A system for extracellular neural interfacing that had the capability for stimulation and recording at multiple electrodes was presented. As the core of this system was a custom integrated circuit (IC) that contained low-noise amplifiers, stimulation buffers, and artifact-elimination circuitry. The artifact-elimination circuitry was necessary to prevent the activity of the stimulation buffers from interfering with the normal functioning of the low-noise amplifiers. The integrated circuits were fabricated in in a 0.35 micron CMOS process. We measured input-referred noise levels for the a
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14

Ferrara, Daro 1961. "DETECTION OF PHENOTHIAZINES USING COATED WIRE ION-SELECTIVE ELECTRODES." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/276493.

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15

Barron, Olivia. "Gas diffusion electrodes for high temperature polymer electrolyte membrane fuel cells membrane electrode assemblies." University of the Western Cape, 2014. http://hdl.handle.net/11394/4323.

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Philosophiae Doctor - PhD<br>The need for simplified polymer electrolyte membrane fuel cell (PEMFCs) systems, which do not require extensive fuel processing, has led to increased study in the field of high temperature polymer electrolyte membrane fuel cells (HT-PEMFCs) applications. Although these HT-PEMFCs can operate with less complex systems, they are not without their own challenges; challenges which are introduced due to their higher operation temperature. This study aims to address two of the main challenges associated with HT-PEMFCs; the need for alternative catalyst layer (CL) ionomers
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16

Maloy, Lucia. "Comparison of Single-Use and Multiple-Use Electrodes for Sensory, Motor Threshold Amplitudes and Force Production." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1995.

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Context: Electrodes play an important role in interfacing tissue with electrical stimulation devices. Manufacturers recommend that adhesive metallic mesh cloth electrodes be used no more than 10 times before they are discarded, however, clinically the electrodes are often used up to 30 times. Another concern is sanitation. When electrodes are used on different patients, there is a chance for cross-contamination and bacterial growth on the electrode. Objective: To compare amplitudes of perceived sensation, motor twitch and force produced at specific amplitudes using single-use electrodes that r
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17

Ferrigno, Rosaria. "Electrodes interdigitées de puissance /." [S.l.] : [s.n.], 1998. http://library.epfl.ch/theses/?nr=1767.

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18

Khanfar, Mohammad F. "Molybdenum-modified platinum electrodes /." Internet access available to MUN users only, 2003. http://collections.mun.ca/u?/theses,160874.

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19

Davies, Trevor J. "Voltammetry at heterogeneous electrodes." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427873.

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20

Perera, Kuruppuwattage Sarath Daya. "Electroactive-polymer modified electrodes." Thesis, Queen's University Belfast, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336004.

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21

Beh, Seng Kee. "Membranes for enzyme electrodes." Thesis, Cardiff University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305091.

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22

Tinlin, James Robert. "Photoelectrocatalysis by TIOâ‚‚ electrodes." Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270802.

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23

Hall, Geoffrey F. "Organic phase enzyme electrodes." Thesis, Cranfield University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278720.

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24

Saini, S. "Organic phase enzyme electrodes." Thesis, Cranfield University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332925.

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25

Kalia, Yogeshvar Nath. "Development of enzyme electrodes." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46856.

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26

Moorcroft, Matthew James. "Electroanalysis at activated electrodes." Thesis, University of Oxford, 2002. http://ora.ox.ac.uk/objects/uuid:6089e63c-3db2-4627-90e7-13763efcbd07.

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This thesis details advances made within the field of electroanalytical chemistry through the use of working electrodes that have been activated through application of ultrasound, heat, geometry, chemical modification or composition. Initially the thesis reports the enhanced analytical utility of chemically and compositionally modified working electrodes when directed towards the detection and determination of NO<sub>3</sub>¯ and NO<sub>2</sub>¯ anions in environmental samples. This has been achieved through the use of electrodes that have been a) modified with a Cu deposit and b) fashioned fr
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27

Jiang, Lixue. "Structure Engineering towards High-Performance Electrodes for Electrochemical Energy Conversion and Storage." Thesis, Griffith University, 2019. http://hdl.handle.net/10072/389748.

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Major concerns about the effects of increasing fossil fuel consumption on the environment and energy security have prompted the development of sustainable and environmentally-friendly energy conversion and storage technologies based on electrochemical processes (e.g. water electrolysers, batteries and supercapacitors). Electrode materials are a key component of these technologies, and high-performance electrode systems are essential for the realization of a clean-energy-based economy. Numerous efforts have been made to develop advanced electrode materials for energy conversion and storage appl
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28

Myedi, Noluthando. "Electrochemical kinetics and sensing of conjugated dienes in acetonitrile." University of the Western Cape, 2011. http://hdl.handle.net/11394/5424.

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>Magister Scientiae - MSc<br>This thesis focuses on the electroanalysis of some dienes (2-methyl-1.3-butadiene (MBD), tran-1.3-pentadiene (PD), 1.3-cyclohexadiene (CHD) and 3-cyclooctadiene (COD)) found in gasoline and the development of simple electrochemical diene sensors. The detection of dienes in fuels is important as they readily polymerise and form gum in fuel tanks. The electroctivity of the dienes was studied with glassy carbon electrode (GCE) and Pt electrode in tetrabutylammonium perchlorate (TBAP)/acetonitrile solution. Polyaniline-polystyrene sulfonic acid (PANi-PSSA) composite fi
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29

Nimley, Christopher. "Fabrication and Characterization of a Disk Ring Shaped Dual Nanometer-Sized Electrode and Its Application to Generation-Collection." Digital Commons @ East Tennessee State University, 2011. https://dc.etsu.edu/etd/1315.

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This research reports on the fabrication and characterization of integrated dual nanometer-sized electrodes. The electrodes are made of closely spaced nanometer-sized platinum and gold achieved by inserting and pulling platinum wire in cylindrical glass pipette plated with gold. Cyclic voltammetry has been used to characterize the electrodes. Our results show that both electrodes can work individually and can accomplish generation/collection experiments. Factors that may affect the performance of the electrodes as well as formation mechanism of the gold film by electroless plating are discusse
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30

Mathebe, Ntlatseng Gretta Rhoda. "Fabrication and kinetic modeling of cytochrome P4502D6 amperometric biosensors for serotonin reuptake inhibitors." Thesis, University of the Western Cape, 2005. http://hdl.handle.net/11394/1589.

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Magister Scientiae - MSc<br>An amperometric biosensor was prepared by in situ deposition of cytochrome P4502D6 (CYP2D6, P4502D6) enzyme on a polyaniline (PANI)-doped glassy carbon electrode. The PANI film was electrochemically deposited on the electrode at 100 mV s-1 against Ag/AgCl. Cyclic voltammetric characterisation of the PANI film in 1 M HCl solution showed two distinct redox peaks, which prove that the PANI film was electroactive and exhibited fast reversible electrochemistry. The surface concentration and film thickness of the adsorbed electroactive species was estimated to be 1.85 x
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31

Singh, Kanwardeep. "A comparison of electrode recruitment characteristics and muscle fatigue using intramuscular and nerve trunk electrodes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ37980.pdf.

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32

Santana-Aguiar, Francisco Aurelio. "Characterisation of electrode microarrays produced photolithographically and with thiol self-assembled monolayers on gold electrodes." Thesis, Durham University, 2009. http://etheses.dur.ac.uk/45/.

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The macroscale electrochemical theory breaks down with microstructures smaller than the dimensions of the diffusion layer, showing that such electrodes have significant quantitative effects and qualitative advantages. The great advantage of microelectrodes over macroelectrodes is the minimisation of interference, which gives rise to much lower detection limits. Microelectrodes have much reduced ohmic drops and capacitive effects and can be used in the absence of supporting electrolyte. These features have opened a growing interest in the fabrication and application of microelectrodes in variou
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33

Sahar, Abdallah. "Etude par analyse spectrale de processus aux electrodes fortement aleatoires." Paris 6, 1988. http://www.theses.fr/1988PA066522.

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Le but de ce travail a consiste a etudier deux processus electrochimiques a comportement fortement aleatoire, a savoir le degagement de bulles gazeuses sur une electrode et l'electrolyse en lit fluidise
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34

Hernández, Rodríguez Elba María. "Solid Oxide Electrolysis Cells electrodes based on mesoporous materials." Doctoral thesis, Universitat de Barcelona, 2018. http://hdl.handle.net/10803/665269.

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The need of substituting the current energetic model by a system based on clean Renewable Energy Sources (RES) have gained more importance in the last decades due to the environmental issues related to the use of fossil fuels. These energy sources are site-specific and intermittent, what makes essential the development of Energy Storage Systems (ESS) that allows the storage of the electricity generated by renewable energies. Among the technologies under development for the storage of electrical energy, Solid Oxide Electrolysis Cells (SOECs) have been proposed in the last decades as a prom
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35

Hüsser, Oskar E. "Photoelectrochemistry at (semi) insulating electrodes /." Zürich, 1987. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=8384.

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36

Sekretaryova, Alina. "Novel reagentless electrodes for biosensing." Licentiate thesis, Linköpings universitet, Kemiska och optiska sensorsystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-112345.

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Analytical chemical information is needed in all areas of human activity including health care, pharmacology, food control and environmental chemistry. Today one of the main challenges in analytical chemistry is the development of methods to perform accurate and sensitive rapid analysis and monitoring of analytes in ‘real’ samples. Electrochemical biosensors are ideally suited for these applications. Despite the wide application of electrochemical biosensors, they have some limitations. Thus, there is a demand on improvement of biosensor performance together with a necessity of simplification
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37

Luscombe, Darryl L., and mikewood@deakin edu au. "Studies with voltammetric microdisk electrodes." Deakin University. School of Sciences, 1991. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20051201.153433.

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38

Marozzi, Paolo. "3D Electromagnetic characterization ofimplantable electrodes." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-117730.

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Bioimpedance is a common feature of every tissue and its analysis allows the understanding of the physiological state of the tissue under test as well as its changes. The increase of glucose concentration can be detected by monitoring the tissue bioimpedance. In high risk situations and subjects like athletes, several checks with high accuracy are required each day. The scientific community has focused its efforts to find an integrated solution for in-vivo implantable bioimpedance measurement devices. The implantable devices have better accuracy since they are placed closer to the tissues unde
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39

Szente, Roberto Nunes. "Erosion of plasma torch electrodes." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74256.

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The erosion of copper electrodes in a concentric cylinder geometry with magnetically driven arcs was studied at steady state for currents up to 250 A in a variety of gases and gas mixtures, magnetic field strengths and gas flow rates. The effects of arc velocity, gas composition, current density and heat transfer to the cathode on erosion rates were examined.<br>The arc velocity varied with the magnetic field strength and arc current accordingly to a newly developed equation, V $ alpha$ B$ sp{0.60}$ I$ sp{0.56}$, when the cathode surface was slightly contaminated with C, Cl, O or N. The compos
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40

Daly, Colette Lynn. "Binding studies using membrane electrodes." Thesis, University of Salford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252942.

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The research embodied within this thesis has contributed to the development and application of a novel electrode technique. The electrodes fabricated herein consist of a thin PVC/Poly (vinylchloride) membrane which is made sensitive to a particular organic cation, for example Acridine Orange. The only requirements necessary to make an electrode were that the substance to be incorporated into the membrane be cationic, water soluble and surface active. These membrane electrodes gave an emf directly proportional to the log of the ( concentration of organic cations present in solution.
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41

Pratt, Keith Francis Edwin. "Modelling of amperometric enzyme electrodes." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260018.

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42

Cox, Philip. "Electrosynthesis on non-metal electrodes." Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252664.

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43

Cleghorn, Simon John Charles. "Electrocatalytic hydrogenation at palladium electrodes." Thesis, University of Southampton, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332771.

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44

Mount, A. R. "The development of modified electrodes." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/47326.

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45

Murphy, Lindy Jane. "Conducting organic salt enzyme electrodes." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46459.

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46

Parsons, Keith Paul. "Conducting polymers for modified electrodes." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38134.

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47

Wilson, Peter John. "Electrochemical ESR of modified electrodes." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47717.

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48

Craston, D. H. "The development of enzyme electrodes." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/37981.

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49

Li, Fengbin. "Studies of polymer modified electrodes." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46412.

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50

Tebbutt, Peter. "The development of modified electrodes." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38173.

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