To see the other types of publications on this topic, follow the link: Surface Systems.
Dissertations / Theses on the topic 'Surface Systems'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Surface Systems.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Pudney, Christopher John. "Surface modelling and surface following for robots equipped with range sensors." University of Western Australia. Dept. of Computer Science, 1994. http://theses.library.uwa.edu.au/adt-WU2003.0002.
Full textAbstract:
The construction of surface models from sensor data is an important part of perceptive robotics. When the sensor data are obtained from fixed sensors the problem of occlusion arises. To overcome occlusion, sensors may be mounted on a robot that moves the sensors over the surface. In this thesis the sensors are single–point range finders. The range finders provide a set of sensor points, that is, the surface points detected by the sensors. The sets of sensor points obtained during the robot’s motion are used to construct a surface model. The surface model is used in turn in the computation of the robot’s motion, so surface modelling is performed on–line, that is, the surface model is constructed incrementally from the sensor points as they are obtained. A planar polyhedral surface model is used that is amenable to incremental surface modelling. The surface model consists of a set of model segments, where a neighbour relation allows model segments to share edges. Also sets of adjacent shared edges may form corner vertices. Techniques are presented for incrementally updating the surface model using sets of sensor points. Various model segment operations are employed to do this: model segments may be merged, fissures in model segment perimeters are filled, and shared edges and corner vertices may be formed. Details of these model segment operations are presented. The robot’s control point is moved over the surface model at a fixed distance. This keeps the sensors around the control point within sensing range of the surface, and keeps the control point from colliding with the surface. The remainder of the robot body is kept from colliding with the surface by using redundant degrees–of–freedom. The goal of surface modelling and surface following is to model as much of the surface as possible. The incomplete parts of the surface model (non–shared edges) indicate where sections of surface that have not been exposed to the robot’s sensors lie. The direction of the robot’s motion is chosen such that the robot’s control point is directed to non–shared edges, and then over the unexposed surface near the edge. These techniques have been implemented and results are presented for a variety of simulated robots combined with real range sensor data.
2
Wilhelm, Gary L. "Analyzing and sharing data for surface combat weapons systems." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FWilhelm.pdf.
Full text
3
Walker, James D. "Artificial surface mounted rotor systems: Experimental studies using surface second harmonic generation." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3256450.
Full text
4
Male, John Christie. "Liquid surface measurement in stereolithography." Thesis, Brunel University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343290.
Full text
5
Hoppe, Hugues. "Surface reconstruction from unorganized points /." Thesis, Connect to this title online; UW restricted, 1994. http://hdl.handle.net/1773/6924.
Full text
6
Collins, Michelle Louise. "Surface treatment for new engineered aerospace systems." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/surface-treatment-for-new-engineered-aerospace-systems(79c66e05-aaea-4dc3-bb8f-4d281ea1ea78).html.
Full textAbstract:
During this EngD project, two pigmented, anti-corrosion polymer/sol-gel hybrid coatings were developed with the aim of producing an eco-friendly alternative to conventional, toxic hexavalent chromate conversion and anodized anti-corrosion alloy treatments for the aircraft manufacturer; Airbus S.A.S. The polymer/sol-gel hybrid coatings were then tested and validated as anti-corrosion coatings on the AA2024-T3 aluminium aerospace alloy and in certain cases, their performance was compared against that of the hexavalent chromate benchmark (Alocrom 1200). The mechanisms of corrosion inhibition exhibited by the coatings were also studied in depth. The polymer/sol-gel hybrid coatings that were developed in this project are silane based and the first, designated as B2, has polyester-methacrylic functionality and the second, designated as CA/MM, has polyester-amide functionality. Certain inhibitor compounds which were incorporated in the polymer/sol-gel hybrid coatings were chosen by the split-cell technique. The microstructure and elemental compositions of the polymer/sol-gel hybrid coatings and of the AA2024-T3 aluminium alloy were determined by Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopic (SEM-EDS) analysis of the specimens. The anti-corrosion performance and the corrosion protection mechanisms of the polymer/sol-gel hybrid coatings were determined by salt-water and electrochemical testing of the coated alloy specimens. The thermal resistance of the polymer/sol-gel hybrid coatings was ascertained by thermogravimetric analysis (TGA) of the coatings. The polymer/sol-gel hybrid coatings were also analysed by Fourier Transform Infrared (FTIR), Micro-Raman and X-ray Photoelectron (XPS) spectroscopic techniques to determine whether the desired polymer and silane coating networks formed during coating processing. Anti-corrosion performance test results revealed that both polymer/sol-gel hybrid coatings are self-healing due to their ability to implement a precipitation mechanism of corrosion inhibition. Analysis of the polymer/sol-gel hybrid coatings by X-ray Diffraction (XRD) and X-ray Fluorescence (XRF) after salt-water exposure suggested that the B2 coating precipitated the compound tungsten pyrophosphate, W(P2O7), within defects and that the CA/MM coating precipitated the compound iron carbide, Fe2C, within defects. However, anti-corrosion test results also shown that the anti-corrosion performance of the polymer/sol-gel hybrid coatings does not satisfy aerospace industry requirements. Therefore, it can be concluded that although the achievements of this project have not enabled Airbus to eliminate toxic chromium (VI) species from their operations, further optimisation of the polymer/sol-gel hybrid coatings developed during this project could potentially lead to a solution being found.
7
Williams, Matthew Joseph Nav E. Massachusetts Institute of Technology. "Model testing and computational analysis of a high speed planing hull with cambered planing surface and surface piercing hydrofoils." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100115.
Full textAbstract:
Thesis: Nav. E., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.Thesis: S.M. in System Design and Management, Massachusetts Institute of Technology, Engineering Systems Division, System Design and Management Program, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 157-158).
As part of a 2014 thesis, the MIT Innovative Ship Laboratory (iShip) designed a high-speed planing hull form that was based on the Model Variant 5631 developed at the US Navy's David Taylor Model Basin [7] [3] [5]. This model was a variant of the parent hull 5628. The 5631 variant was a model of the 47 foot Motor Lifeboat of the US Coast Guard, which was a hard chine, deep-vee vessel. Model 5631 had no step, with a 20 degree dead rise angle. The Clement method [4] was used in order to design a cambered planing surface that would generate dynamic lift and support most of the weight of the vessel. A second cambered step was designed using an in-house lifting surface program. The step was designed such that, at top speed, the entire hull aft of the step would be ventilated. To accommodate this effect, the aft underbody design departed from the conventional dead-rise. Directional stability of the model in the pre-planing regime was increased by incorporating three vertices at the design dead-rise angle. A set of super-cavitating, surface-piercing hydrofoils were designed to be attached aft of the vessel transom in order to provide support and prevent re-wetting of the afterbody. The constructed hydrofoils were positioned in a vee configuration, differing from the anhedral design in the Faison thesis. A support manual control system for the hydrofoils was designed as part of this thesis. Known as Model 5631D, this dynaplane model underwent a series of tests at the 380 foot towing tank at the United States Naval Academy in Annapolis, Maryland, over the course of several days. Several parameters were varied during the tests: the cambered step (via the wedge insert), the carriage speed, and the model longitudinal center of gravity (LCG). In this thesis, data from the series of tests of Model 5631D will be compared to that of the tests of Model 5631 by combining methods from Savitsky [15] and Faltinsen [8] for data scaling of planing vessels. Both models were scaled to the same static waterline length in order to determine the efficacy of the new design changes of Model 5631D in reducing total drag. Additionally, comparisons of the test data were made to computational fluid dynamics models conducted under the same conditions in the virtual environment. An introduction and motivation for the thesis is presented in Chapter 1. Half and full factorial statistical analysis was performed on the testing data and presented in Chapter 2, along with the results of data scaling and comparison of Hull 5631D's performance to the parent hull. Results of the CFD simulations along with calculation of model stability is presented in Chapter 3. Conclusions and opportunities for future work are given in Chapter 4. A full catalogue of the testing data is given in Appendix A.
by Matthew Joseph Williams.
Nav. E.
S.M. in System Design and Management
8
Heni, Martin. "Surface induced effects in hard sphere systems." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962680818.
Full text
9
Ash, Philip Andrew. "Surface freezing in surfactant/alkane/water systems." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/843/.
Full textAbstract:
Surface freezing transitions in mixed monolayers of a homologous series of cationic surfactants, the alkyltrimethyl ammonium bromides (CnTAB where n = 12, 14, 16, 18), as well as a range of non-ionic, zwitterionic and biological surfactants, have been investigated ellipsometrically with a range of n-alkanes (Cm where m = 12 – 20, 28). Two distinct solid phases are observed depending upon the chain length difference between surfactant and n-alkane. Type I solid phases consist of a surface frozen mixed monolayer and are formed when this difference is small. Type II solid phases are bilayer structures with a frozen layer of neat n-alkane above a liquid-like mixed monolayer. Type II freezing was thought to occur via wetting of surface frozen n-alkane, as previously reported type II transitions took place in the presence of surface frozen n-alkanes. Thermodynamically stable type II solid phases have now been found in the presence of n-alkanes that do not show surface freezing at the air/alkane interface, however, and so this picture is incomplete. In the presence of pentadecane, for example, the biological surfactant lyso-OPC forms a stable type II solid phase 6.5 °C above the n-alkane bulk melting point. Such a large surface freezing range is unprecedented for a type II system. Studies using external reflection FTIR (ER-FTIRS) and vibrational sum-frequency spectroscopies (VSFS) have been used to probe these novel behaviours. Results were fully consistent with the proposed structures of both type I and type II surface frozen layers. 2D correlation analysis of ER-FTIR spectra as a function of temperature showed that type II frozen layer formation does not proceed via a simple wetting transition, with the formation of a transient intermediate implied. Evidence for such an intermediate was provided by dynamic ellipsometry measurements on the type II C18TAB/n-eicosane system.
10
Okayasu, Toshiki. "Surface patterning with polymer/metal bilayer systems." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.483691.
Full text
11
Berwick, James Miles. "Surface-engineered biomimetic systems for drug delivery." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416292.
Full text
12
Wang, W. L. "Enhancement of fidelity of surface measurement systems." Thesis, University of Warwick, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308509.
Full text
13
Lubarsky, Gennady V. "Colloid phenomena in surface-modified polymer systems." Thesis, Robert Gordon University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425376.
Full text
14
McIntosh, Eliza Mary. "Adsorption and dynamics of interacting surface systems." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.608209.
Full text
15
Parker, Katie Elizabeth. "Patterns, systems, layers: an investigation of surface." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1329236832.
Full text
16
Cipolla, Roberto. "Active visual inference of surface shape." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293392.
Full text
17
Harris, Simon Michael. "Resonant electron scattering phenomena in molecule-surface systems." Thesis, University of Liverpool, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283046.
Full text
18
Arvizo, Rochelle R. "Applying surface modified gold nanoparticles to biological systems." Amherst, Mass. : University of Massachusetts Amherst, 2009. http://scholarworks.umass.edu/dissertations/AAI3372254/.
Full text
19
Würz-Wessel, Alexander. "Free formed surface mirrors in computer vision systems." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=96833895X.
Full text
20
Walle, Lars Erik. "Surface science studies of TiO2 single crystal systems." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-6682.
Full textAbstract:
Titanium dioxide is a material finding applications in variety of areas, including catalysis, photocatalysis, photovoltaics, energy storage, gas sensors and biocompatible materials. As a consequence, this material has been the target of numerous scientific studies over the last years. Due to its availability the rutile polymorph of TiO2 has become the benchmark surface for fundamental studies of metal oxide surface chemistry and the majority of experimental studies have been performed on this phase. The emergence of nanoscience has shifted the focus towards the anatase polymorph since this phase is preferred when forming TiO2 nanoparticles and applied systems almost exclusively comprise anatase TiO2 nanostructures. In this thesis synchrotron based high resolution photoelectron spectroscopy (PES) in combination with X-ray absorption spectroscopy (XAS) has been utilized to study how clean TiO2 single crystal surfaces interact with molecular and metallic adsorbates and formation of TiO2 films on a metal surface. O 1s XAS in conjunction with PES was used to explore the conduction-band edge of single crystalline and nanostructured anatase TiO2. In the O 1s XAS process pure Ti d states cannot be probed due to selection rules. By appropriate energy referencing, the separation between the Ti d derived conduction-band edge and the threshold of the unoccupied Ti d-O p states was revealed. Also, 4% of an electronic charge per Ti ion was found to be sufficient to change the character of the empty states at threshold from pure Ti d to Ti d-O p, in good agreement with theoretical values. By using highly surface sensitive PES, water adsorption on the rutile TiO2(110) and anatase TiO2(101) and (001) surfaces was investigated. For all three surfaces the formation of a water monolayer involving both associative and dissociative adsorption was demonstrated. Reducing the coverage by heating the monolayer resulted in an increased OH:H2O ratio. For the rutile TiO2(110) surface, without oxygen vacancies, neither OH nor H2O originating from the monolayer could be detected at room temperature, indicating that OH in the mixed monolayer is much less stable than OH formed at oxygen vacancies. The detailed nature of OH in the mixed layer was consistent with the notion of pseudo-dissociated water. For the anatase TiO2(001) surface dissociation occurred on the ridges of the (41) reconstruction, while a mixture of molecular and dissociated water was formed either in connection to the ridges or on the terraces. The exact composition of the monolayer on the anatase TiO2(101) was difficult to deduce due to simultaneous desorption of first and second layer water. Submonolayer growth of Au on the anatase TiO2(101) surface resulted in two different Au particle types forming, one defect related minority type, which was only discerned up to an Au coverage of 0.14 ML. It appeared to be size-limited and had a constant relative CO uptake. A second particle type was first observed at 0.14 ML Au and continued to grow at higher Au coverages. It exhibited a decreasing relative CO uptake with increasing Au dose. The first particle type was attributed to oxidized gold, nucleating at oxygen adatoms on the terraces, while the second type was believed to be neutral gold particles growing at steps. High resolution PES and XAS were used to study the formation of an ultrathin TiOx film on the Pt(110)-(12) reconstructed surface. A structural change from a rutile-like structure when TiOx coexisted with PtO2 to an anatase-like structure upon completion of the TiOx bilayer on the Pt surface was observed. A band bending of about 0.8 eV, induced by the PtO2 structures, was seen for the TiOx bilayer islands, an effect that disappeared upon completion of the bilayer. The full TiOx bilayer displayed a band gap 0.2 eV lower than that observed for bulk anatase
21
Neumann, Natasha Niki. "The ecohydrology of coupled surface water - groundwater systems." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44077.
Full textAbstract:
Our ability as a society to responsibly manage water resources for both humans and the environment relies on accurate predictive models. Current hydrologic models are unable to simulate important biogeochemical reactions that occur in systems where surface water and groundwater are coupled, where flowpaths alternate between highly contrasting surface and subsurface environments. Informed and responsible aquatic ecosystem management requires an understanding of the complex feedbacks between ecological properties and functions in ponds, streams, rivers and lakes, and the catchment hydrological processes affecting the quantity and quality of water entering aquatic systems. The types of flowpaths and the duration of water flow in a catchment determine the physical and chemical characteristics of water entering aquatic systems, which in turn affect the natural range of ecological properties and functions.
The primary objective of this work was to create capacity for better prediction of the impacts of hydrologic variability on aquatic ecosystems. Three field studies were undertaken, representing different aquatic ecosystems (a river, stream, and lake) and different ecological functions (salmon spawning habitat use, wetted habitat availability, and nutrient cycling) occurring at different scales (point, regional and catchment). For each study, a combined hydrochemical and hydrometric approach was developed to describe the variability in flowpaths over space and time, and to quantify or infer the relative transit times of water received from the catchments. Water exiting a catchment is the convergence of many different flowpaths with many different transit times. It was found that the selected ecological processes could be discussed in terms of transit time, specifically the ratio of long to short transit times of water delivered to an aquatic system. These results were used to propose a conceptual model capable of predicting the impacts of climatic variability and change and anthropogenic activities on aquatic ecosystems through their effects on hydrologic processes. Further work is needed to quantify the transit time ratio and test the efficacy of the predictive model.
22
Roe, Gerard. "Surface and catalytic chemistry of Ni/Sm systems." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282064.
Full text
23
Macadam, Scott. "Soot surface growth mechanisms in stationary combustion systems." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10410.
Full text
24
Tang, Kah Beng-Kirel. "Excitation of surface systems by low energy electrons." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627598.
Full text
25
Cairns-McFeeters, Eugenia L. "Effects of surface-based ducts on electromagnetic systems." Thesis, Monterey, California : Naval Postgraduate School, 1992. http://handle.dtic.mil/100.2/ADA257443.
Full textAbstract:
Thesis (M.S. in Systems Engineering (Electronic Warfare)--Naval Postgraduate School, September 1992.Thesis Advisor: Davidson, Kenneth L. "September, 1992." Description based on title screen as viewed on March 18, 2009. Includes bibliographical references (p. 120-121). Also available in print.
26
ARNONE, ROSARIA. "Intracellular and surface redox systems in human platelets." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2010. http://hdl.handle.net/2108/1195.
Full textAbstract:
Redox balance is important for platelet physiology, indeed it is crucial for blood coagulation and thrombosis. This thesis will give an update on intracellular and plasma membrane systems involved on redox homeostasis in human platelets, with particular regard to vitamin C and plasma membrane NAD(P)H oxidases.
The redox balance is linked to the presence of intracellular antioxidants; in particular, vitamin C appears to be a key modulator of platelet oxidative state, since these cells physiologically accumulate ascorbic acid. Here, we showed, for the first time, that platelets could compensate for fluctuations in ascorbate levels by modulating the expression of the Na+-dependent transporter SVCT2 at translational level. Moreover, we showed that changes in intracellular ascorbic acid content had physiological relevance, since they modulate the surface sulfhydryl content and the thrombus viscoelastic properties.
Intracellular reducing equivalents can be propagated to the plasma membrane and electrons transferred to external acceptors, thus affecting both adjacent cells and circulating blood components. In platelets, the plasma membrane redox (PMR) system has not yet been fully characterized and the molecular identities of most components are unknown. Here we described the presence of at least one member of the plasma membrane hydroquinone-(NADH) oxidase family (namely Ecto-NOX1). We found that Ecto-NOX1 is sensitive to capsaicin: indeed, it is up-modulated through a mechanism requiring binding of capsaicin to its receptor, namely the transient receptor potential vanilloid subtype 1 (TRPV1). Ligand-receptor interaction triggers a signalling cascade leading to reactive oxygen species (ROS) production, which in turn enhances the expression and activity of Ecto-NOX1. Redox regulation of Ecto-NOX1 may be important for platelet recruitment and activation during inflammatory diseases.
27
Capriotti, Lisa A. "Surface-induced peptide folding." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 347 p, 2009. http://proquest.umi.com/pqdweb?did=1824967161&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Full text
28
Tongpadungrod, Pensiri. "Characteristics of distributive tactile sensing systems." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390833.
Full text
29
Salehi, Shahin. "Machine Learning for Contact Mechanics from Surface Topography." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76531.
Full text
30
Gracar, Peter. "Random interacting particle systems." Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.761028.
Full textAbstract:
Consider the graph induced by Z^d, equipped with uniformly elliptic random conductances on the edges. At time 0, place a Poisson point process of particles on Z^d and let them perform independent simple random walks with jump probabilities proportional to the conductances. It is well known that without conductances (i.e., all conductances equal to 1), an infection started from the origin and transmitted between particles that share a site spreads in all directions with positive speed. We show that a local mixing result holds for random conductance graphs and prove the existence of a special percolation structure called the Lipschitz surface. Using this structure, we show that in the setup of particles on a uniformly elliptic graph, an infection also spreads with positive speed in any direction. We prove the robustness of the framework by extending the result to infection with recovery, where we show positive speed and that the infection survives indefinitely with positive probability.
31
Tucker, Ian Malcolm. "The surface and solution properties of complex mixed surfactant systems." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670103.
Full text
32
Bednarska, Aleksandra. "Artificial systems for in vitro gene expression." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLN016/document.
Full textAbstract:
L’ARN polymérase dépendante d’ADN (RNAP) est une enzyme responsable de la polymérisation de ribonucleotides dans une séquence d'ARN complémentaire de l'ADN de matrice. La famille de RNAP a plusieurs membres, comme de protéines sous-unité unique (par exemple du bactériophage T7) ou multiple sous-unité (bactériennes et eucaryotes). Transcription de l'ARN - un événement crucial dans l'expression des gènes - varie en fonction de l'origine de RNAP. Bien que le processus de transcription est relativement bien caractérisée, de nombreux éléments restent mal compris, surtout par rapport à la dynamique de la reconnaissance de promoteur, d'évasion et de l'allongement dans une contexte de cellule où la densité moléculaire, les concentrations et les effets plus proches environs sont importants. L'objectif de cette thèse était la développement d’une méthode qui permettrait suivre la réaction RNAP in vitro en temps réel dans des conditions très contrôlées. Un axe majeur a été mis pour développer un biocapteur basé surface qui permettrait à la caractérisation des principales étapes de la réaction de transcription. Par conséquent, les interactions entre des molécules d'ADN immobilisés sur une surface du capteur et RNAP libre délivré par un système microfluidique de la surface ont été examinées. Changements de l'indice de réfraction, corrélés avec les changements de masse sur la surface ont été suivis en utilisant l'imagerie par résonance de plasmon de surface (SPRi). SPRi est une technique sensible dédiée à l'analyse des interactions entre deux ligands en temps réel. Les bases du mécanisme sont la détection de légères différences dans la réflexion de la lumière polarisée à un angle fixe qui est associé avec une variation de masse à l'interface. Les données obtenues à partir SPRi sont utilisées pour déterminer la cinétique des interactions. Géométrie d’ADN puces permet de suivre plusieurs échantillons simultanément, qui raccourcit considérablement le temps que de manipulation et améliore la qualité et la reproductibilité des résultats obtenus. Autres biocapteurs optofluidique: résonateur de microring et microscopie de fluorescence par réflexion totale interne (TIRF) ont été développés en parallèle. Nous avons biofunctionalisé et caractérisé des surfaces de capteur (de verre couvert de polymère pour un résonateur de microring et la microscopie TIRF et 50 nm couche mince d’or sur des prismes de SPRi) afin d'immobiliser ADN d'une manière contrôlée, par création d’une monocouche auto-assemblée (SAM). Fonctionnalisation de polymères SU-8 concernées deux méthodes: covalent immobilisation de (bio) molécules et la conjugaison non covalente sur la base de couplage hydrophobe. Pour la fonctionnalisation de surface d’or, quatre stratégies différentes d'immobilisation des molécules ont été comparés: formation de la liaison de thiol - or, la formation des liaisons amide, interactions extrAvidin - biotine et le couplage hydrophobe. Les études de la conjugaison de l'ADN à la surface d'or fonctionnalisé ont été effectuées en ce qui concerne la spécificité et la densité d'ADN immobilisées de longueurs différentes: 50, 500 et 1000 pb. Enfin, les surfaces biofunctionalized ont été utilisées pour suivre en temps réel des réactions de transcription de deux RNAP: bactériophage T7 RNAP monomère et l'holoenzyme d'Escherichia coli RNAP. Les analyses cinétiques de la formation d’un complexe nucléoprotéine et la transcription d'ARN ont été fait par report de la densité et la longueur de l'ADN immobilisé, la position de la séquence du promoteur spécifique. Transcription de l'ARN dans l'appareil SPRi a été confirmée par la collection, la détection et l'analyse des produits ARN.L'objectif final comprends une synthèse de l'ARN contrôlée qui serait une étape intermédiaire d'enquêter en temps réel la production de protéines in vitroDNA-dependent RNA polymerase (RNAP) is an enzyme responsible for the polymerization of ribonucleotides into an RNA sequence complementary to the template DNA. RNAP family has several members being single subunit (e.g. T7 bacteriophage) or multi subunit (bacterial and eukaryote) proteins. RNA transcription – a crucial event in gene expression – differs depending on the RNAP origin. Although the transcription process is relatively well characterized, many elements remain poorly understood, especially with respect to the dynamics of promoter recognition, escape and elongation in a cell like context where molecular density, concentrations and nearest neighbour effects are prevalent.The goal of this thesis was to develop a robust method that would allow real time monitoring of RNAP reaction in vitro in thoroughly controlled conditions. A major axis was to develop a surface-based biosensor that would allow the characterization of the main steps of the transcription reaction. Consequently, interactions between DNA molecules immobilized on a sensor surface and free RNAP delivered through a microfluidic flow system to the surface were examined. Changes in refractive index, correlated with changes in mass at a surface were followed using surface plasmon resonance imaging (SPRi). SPRi is a sensitive technique dedicated to analysis of interactions between two ligands in real time. The mechanism bases on the detection of slight differences in the reflectivity of polarized light at a fixed angle that are associated with a mass variation at the interface. Data obtained from SPRi are used to determine the kinetics of the interactions. Microarray geometry of SPRi allows monitoring several samples simultaneously that significantly shortens manipulation time and improves a quality and reproducibility of obtained results. Other label-free optofluidic biosensors: microring resonator and total internal reflection fluorescence (TIRF) microscopy were developed in parallel.We firstly biofunctionalized and characterized sensor surfaces (polymer coated glass for microring resonator and TIRF microscopy and 50-nm thin layer gold coatings on glass prisms for SPRi) in order to immobilize DNA strands in a controlled manner, using a self-assembled monolayer (SAM). Functionalization of photoresist polymer SU-8 concerned two methods: covalent (bio)molecule grafting and non-covalent conjugation based on hydrophobic coupling. Regarding gold surface functionalization, four different strategies of antifouling (bio)molecule immobilization were compared: thiol – gold bond formation, amide bond formation, extrAvidin – biotin interactions and hydrophobic coupling. Studies of DNA conjugation to the functionalized gold surface were performed with respect to specificity and density of immobilized DNA molecules of different lengths: 50, 500 and 1000 bp.Finally, biofunctionalized surfaces were used for real time monitoring of transcription reactions using two RNAPs: monomeric bacteriophage T7 RNAP and the holoenzyme of Escherichia coli RNAP. Kinetic analyses of nucleoprotein complex formation and RNA transcription were performed as a function of immobilized DNA density, the length of the immobilized DNA, the position of the specific promoter sequence with respect to the point of immobilization and the direction of subsequent transcription. RNA transcription in the SPRi apparatus was confirmed by collection, detection and analysis of relevant products.The future development of biosensors dedicated to in vitro gene expression will include the adaptation of the methods presented above to other optofluidic systems and further development of the technique. The final goal comprises a controlled RNA synthesis that would be an intermediate step to investigate real time in vitro protein production
33
Brockdorff-Ahlefeldt, Cay von. "Noise hazard assessment in surface mine design." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282576.
Full text
34
Yau, Meng Wee Joses. "Localization of Surface or Near-Surface Drifting Mines for Unmanned Systems in the Persian Gulf." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/7436.
Full textAbstract:
This thesis investigates the combined use of ocean models, such as idealized surface current flows, and search models, including expanding area and discrete myopic search methods, to improve the probability of detecting a near-surface, drifting object over time. Enhanced search effectiveness is facilitated by the use of robotic search agents, such as a tactical unmanned underwater vehicle (UUV) or unmanned aerial vehicle (UAV), leveraging simulation methods to inform the search process. The presented work investigates the impact of using nave versus optimized search patterns on localizing a drifting object, including a surrogate ocean model using idealized flow as well as historical data sets with Weibull-distributed perturbations. Numerical studies and extensive analysis using different permutations of model parameters (including the relative speed of the drifting object, time late in the searcher�۪s arrival to the search area, sensor sweep width, and duration of the search mission) identify the significant factors affecting the overall probability of detection. Such insights enable further explorations using empirical datasets for specific oceanographic regions of interest.
35
Touzalin, Thomas. "Tip-enhanced Raman spectroscopy on electrochemical systems." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS364.
Full textAbstract:
L'analyse in situ d'interfaces électrochimiques à l'échelle nanométriques est un enjeu majeur pour la compréhension des mécanismes de transferts de charges et d'électrons dans les domaines du stockage d'énergie ou de l'électrocatalyse. Ce travail a permis le développement de la spectroscopie Raman exaltée de pointe (TERS) en milieu liquide et en conditions électrochimiques. Le TERS permet l'analyse de la structure de molécules ou de matériaux à l'échelle nanométrique du fait de l'exaltation localisée du champ électrique à l'extrémité d'une sonde de microscope à effet tunnel (STM) en or ou en argent. Un dispositif reposant sur l'illumination d'une pointe au travers d'un solvant organique a démontré la possibilité d'imager les inhomogénéités d'une monocouche auto-assemblée sur or. Une seconde approche reposant sur l'exaltation du signal Raman à l'apex d'une pointe de taille nanométrique utilisée comme microélectrode (spectroscopie Raman exaltée de surface de pointe, tip SERS) a permis de suivre la réduction d'une monocouche auto-assemblée et d'améliorer la compréhension de son mécanisme. Afin d'imager la surface d'une électrode polarisée, le couplage d'un STM utilisant une pointe TERS en conditions électrochimiques a montré une résolution latérale de moins de 8 nm pour sonder de variations locales de l'exaltation du champ électromagnétique induites par des singularités géométriques de surface. Par ailleurs, l'analyse TERS de couches organiques formées à partir de sels d'aryldiazoniums a permis de montrer des différences de structures selon type de greffage. Ce travail constitue donc une avancée majeure pour l'analyse locale de surfaces modifiéesThe in situ investigation of electrochemical interfaces structures at the nanoscale is a key element in the understanding of charge and electron transfer mechanisms e.g. in the fields of energy storage or electrocatalysis. This thesis introduces the implementation of tip-enhanced Raman spectroscopy (TERS) in liquid and in electrochemical conditions enabling the nanoscale analysis of electrified solid/liquid interfaces through the strong and local electric field enhancement at gold or silver scanning tunneling microscopy (STM) probes. The ability of TERS to image inhomogeneities in the coverage density of a self-assembled monolayer (SAM) through a layer of organic solvent on gold was demonstrated. A TERS-inspired analytical tool was also developed, based on a TERS tip used simultaneously as a single-hot spot surface-enhanced Raman spectroscopy (SERS) platform and as a microelectrode (EC tip SERS). The reduction of an electroactive SAM could then be monitored by electrochemical and in situ SERS measurements. In situ electrochemical STM-TERS was also evidenced through the imaging of local variations of the electric field enhancement on peculiar sites of a gold electrode with a lateral resolution lower than 8 nm. Finally TERS also demonstrated to be efficient in investigating the structure of organic layers grafted either by electrochemical reduction or spontaneously. This work is therefore a major advance for the analysis of functionalized surfaces
36
Chung, Eunhyea. "Colloidal particle-surface interactions in atmospheric and aquatic systems." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43728.
Full textAbstract:
Colloidal particles suspended in a liquid or gas phase often interact with a solid-liquid or solid-gas interface. In this study, experimental data through atomic force microscopy and neutron reflectometry and theoretical results of colloidal particle-surface interactions were obtained and compared. Atmospheric and aquatic environments were considered for the interactions of microbial colloidal particles and nano-sized silica particles with planar surfaces. Spores of Bacillus thuringiensis, members of the Bacillus cereus group, were examined as the microbial particles, simulating the pathogens Bacillus cereus and Bacillus anthracis which are potentially dangerous to human health. Model planar surfaces used in this study include gold which is an electrically conductive surface, mica which is a highly charged, nonconductive surface, and silica.
In atmospheric systems, the interaction forces were found to be strongly affected by the relative humidity, and the total adhesion force of a particle onto a surface was modeled as the addition of the capillary, van der Waals, and electrostatic forces. Each component is influenced by the properties of the particle and surface materials, including hydrophobicity and surface roughness, as well as the humidity of the surrounding atmosphere. In aquatic systems, the interaction forces are mainly affected by the solution chemistry, including pH and ionic strength. The main components of the interaction force between a microbial colloidal particle and a planar surface were found to be the van der Waals and electrostatic forces.
The results obtained in this research provide insights into the fundamental mechanisms of colloidal particle interactions with environmental surfaces in both atmospheric and aquatic systems, contributing to the understanding of the phenomena driving such interfacial processes as deposition, aggregation, and sedimentation. Thus, the results can help us describe the behavior of contaminant colloidal particles in environmental systems and subsequently devise better means for their removal from environmental surfaces.
37
Kesimal, Ayhan. "A comparative study of transportation systems in surface mines." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240483.
Full text
38
Gates, Michael Richard. "Surface acoustic wave investigations of spin and pseudospin systems." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247121.
Full text
39
Silva, Clara Araújo Sena da. "Numerical modelling of radionuclide migration in near-surface systems." Doctoral thesis, Universidade de Aveiro, 2009. http://hdl.handle.net/10773/2754.
Full textAbstract:
Doutoramento em GeociênciasEm todo o mundo são usados, hoje em dia, modelos numéricos hidrogeoquímicos para simular fenómenos naturais e fenómenos decorrentes de actividades antrópicas. Estes modelos ajudam-nos a compreender o ambiente envolvente, a sua variabilidade espacial e evolução temporal. No presente trabalho apresenta-se o desenvolvimento de modelos numéricos hidrogeoquímicos aplicados no contexto do repositório geológico profundo para resíduos nucleares de elevada actividade. A avaliação da performance de um repositório geológico profundo inclui o estudo da evolução geoquímica do repositório, bem como a análise dos cenários de mau funcionamento do repositório, e respectivas consequências ambientais. Se se escaparem acidentalmente radionuclídeos de um repositório, estes poderão atravessar as barreiras de engenharia e barreiras naturais que constituem o repositório, atingindo eventualmente, os ecosistemas superficiais. Neste caso, os sedimentos subsuperficiais constituem a última barreira natural antes dos ecosistemas superficiais. No presente trabalho foram desenvolvidos modelos numéricos que integram processos biogeoquímicos, geoquímicos, hidrodinâmicos e de transporte de solutos, para entender e quantificar a influência destes processos na mobilidade de radionuclídeos em sistemas subsuperficiais. Os resultados alcançados reflectem a robustez dos instrumentos numéricos utilizados para desenvolver simulações descritivas e predictivas de processos hidrogeoquímicos que influenciam a mobilidade de radionuclídeos. A simulação (descritiva) de uma experiência laboratorial revela que a actividade microbiana induz a diminuição do potencial redox da água subterrânea que, por sua vez, favorece a retenção de radionuclídeos sensíveis ao potencial redox, como o urânio. As simulações predictivas indicam que processos de co-precipitação com minerais de elementos maioritários, precipitação de fases puras, intercâmbio catiónico e adsorção à superfície de minerais favorecem a retenção de U, Cs, Sr e Ra na fase sólida de uma argila glaciar e uma moreia rica em calcite. A etiquetagem dos radionuclídeos nas simulações numéricas permitiu concluir que a diluição isotópica joga um papel importante no potencial impacte dos radionuclídeos nos sistemas subsuperficiais. A partir dos resultados das simulações numéricas é possivel calcular coeficientes de distribuição efectivos. Esta metodologia proporciona a simulação de ensaios de traçadores de longa duração que não seriam exequíveis à escala da vida humana. A partir destas simulações podem ser obtidos coeficientes de retardamento que são úteis no contexto da avaliação da performance de repositórios geológicos profundos.
Hydrogeochemical numerical modelling is worldwide used to simulate natural and anthropogenically induced phenomena. These simulations help us to understand the surrounding environment; its spatial variability and temporal evolution. In the present work, hydrogeochemical numerical models are developed in the context of the deep geological repository for high level nuclear waste (HLNW). Performance assessment of a deep geological repository includes the study of its geochemical evolution, as well as the analysis of failure scenarios of the repository and their environmental consequences. If a repository release takes place, radionuclides from the HLNW could migrate through the surrounding engineered and natural barriers and eventually reach the surface ecosystems. In this case, near-surface sediments constitute the last natural barrier between the repository and the surface ecosystems. In this study biogeochemical, geochemical, hydrodynamic and solute transport processes are coupled in different numerical models to understand and quantify the influence of these processes on radionuclide mobility in nearsurface systems. The results attained here prove the robustness of such numerical tools to develop both descriptive and predictive simulations of hydrogeochemical processes that affect radionuclide mobility. The (descriptive) simulation of a jar-fermentor experiment reveals that microbial activity tends to decrease the redox state of groundwater which favours the retention of redox sensitive radionuclides such as uranium. Predictive simulations reveal that co-precipitation with major element phases, precipitation of pure phases, cation exchange and adsorption on charged mineral surfaces provide the retention of uranium, caesium, strontium and radium in the solid phase of a glacial clay and a calcite-rich till deposit. Labelling of radionuclides in the numerical simulations shows that isotopic dilution also plays an important role in the potential impact of radionuclides in the near-surface systems. Finally, effective distribution coefficients can be calculated from the outputs of previous reactive solute transport simulations. This methodology provides the simulation of synthetic tracer tests with long time spans that would not be feasible at the human life scale. The outputs of these synthetic tracer tests provide the estimation of effective retardation factors that may be useful for performance assessment of deep geological repositories.
40
Cowell, Andrew. "Investigation of particle-surface impacts in pneumatic conveying systems." Thesis, Glasgow Caledonian University, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.688312.
Full text
41
Nash, Geoffrey Richard. "Surface acoustic wave investigations of low dimensional electron systems." Thesis, University of Bath, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320474.
Full text
42
Thorn, Angie Sue (Morris). "The impact of nanoparticle surface chemistry on biological systems." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5659.
Full textAbstract:
The unique properties of nanomaterials, such as their small size and large surface area-to-volume ratios, have attracted tremendous interest in the scientific community over the last few decades. Thus, the synthesis and characterization of many different types of nanoparticles has been well defined and reported on in the literature. Current research efforts have redirected from the basic study of nanomaterial synthesis and their properties to more application-based studies where the development of functionally active materials is necessary. Today such nanoparticle-based systems exist for a range of biomedical applications including imaging, drug delivery and sensors. The inherent properties of the nanomaterial, although important, aren’t always ideal for specific applications. In order to optimize nanoparticles for biomedical applications it is often desirable to tune their surface properties. Researchers have shown that these surface properties (such as charge, hydrophobicity, or reactivity) play a direct role in the interactions between nanoparticles and biological systems can be altered by attaching molecules to the surface of nanoparticles.
In this work, the effects of physicochemical properties of a wide variety of nanoparticles was investigated using in vitro and in vivo models. For example, copper oxide (CuO) nanoparticles were of interest due to their instability in biological media. These nanoparticles undergo dissolution when in an aqueous environment and tend to aggregate. Therefore, the cytotoxicity of two sizes of CuO NPs was evaluated in cultured cells to develop a better understanding of how these propertied effect toxicity outcomes in biological systems. From these studies, it was determined that CuO NPs are cytotoxic to lung cells in a size-dependent manner and that dissolved copper ions contribute to the cytotoxicity however it is not solely responsible for cell death. Moreover, silica nanoparticles are one of the most commonly used nanomaterials because they are easy to synthesize and their properties (such as size, porosity and surface chemistry) can be fine-tuned. Silica nanoparticles can be found in thousands of commercially available products such as toothpastes, cosmetics and detergents and are currently being developed for biomedical applications such as drug delivery and biomedical imaging. Our findings herein indicate that the surface chemistry of silica nanoparticles can have an effect on lung inflammation after exposure. Specifically, amine-modified silica NPs are considered to be less toxic compared to bare silica nanoparticles. Together, these studies provide insight into the role that material properties have on toxicity and allow for a better understanding of their impact on human and environmental health.
The final aim of this thesis was to develop surface-modified nanoparticles for drug delivery applications. For this, biodegradable, polymeric NPs were used due to their inert nature and biocompatibility. Furthermore, polymeric NPs are excellent for loading drugs and using them as drug delivery vehicles. In this work, poly (lactic-co-glycolic acid) (PLGA) NPs were loaded with a therapeutic peptide. These NPs were then coated with chitosan (a mucoadhesive polymer) for the treatment of allergic asthma or coated with a small cationic mitochondrial targeting agent for the treatment of ischemia/reperfusion injury.
Taken as a whole, this thesis sheds light on the impact of NPs on human health. First by providing useful toxological data for CuO and silica NPs as well as highlighting the potential of surface-modified polymeric NPs to be used in drug delivery-based applications.
43
BALIJEPALLI, SANTOSH KIRAN. "Application of surface analysis for characterization of metallurgical systems." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2014. http://hdl.handle.net/2108/203082.
Full textAbstract:
Lo scopo della presente tesi di dottorato è lo studio di vari sistemi metallurgici mediante l’utilizzo di tecniche di analisi della superficie: X-ray Photoelectron Spectroscopy (XPS), Auger Electron Spectroscopy (AES) and Scanning Photoemission Microscopy (SPEM). Mediante tali tecniche, è stato possibile ottenere informazioni sulla composizione chimica, stechiometria, stato di ossidazione e distribuzione laterale (mappe chimiche) degli elementi che compongono i campioni analizzati. Il lavoro è suddiviso in tre argomenti: (i) effetto dei due trattamenti di carbo-cementazione dell’acciao inossidabile a bassa temperatura; (ii) investigazione micro-chimica di rivestimenti spessi a base di tungsteno su un acciaio inossidabile martensitico AISI 420; (iii) studio della disomogeneità micro-chimica in una lega eutettica di Pb-Bi allo stato liquido. Grazie alla loro grande versatilità e flessibilità, le tecniche XPS e AES sono utilizzate per l’investigazione di materiali che trovano applicazione in vari campi tecnologici quali metallurgici, materiali compositi, ceramici, ecc. In futuro, il potenziale delle tecniche di analisi della superficie sarà esplorato per lo studio di differenti sistemi metallurgici.The aim of this work is to investigate the metallurgical systems by using the surface characterization techniques: X-ray Photoelectron Spectroscopy (XPS), Auger Electron Spectroscopy (AES) and Scanning Photoemission Microscopy (SPEM) at the ELETTRA synchrotron (Trieste, Italy). By using this type of surface-sensitive techniques on metallurgical systems, it is possible to obtain the information on the materials chemical composition, stoichiometry, chemical states and electronic configuration of constituent elements and surface chemical maps. This work can be subdivided into three topics that are linked by the use of the same experimental techniques. These topics are the following: (i) comparison of two different low temperature carburizing treatments of the steel, (ii) micro-chemical investigation of tungsten thick coatings on AISI 420 martensitic stainless steel, (iii) study of micro-chemical inhomogeneity in eutectic Pb-Bi alloy quenched from melt. Thanks to the wide range of variety and flexibility of applications of XPS and AES, these techniques can be used for the investigation of various systems, such as metallurgical, composite materials, ceramics, etc. In future, the potential of surface analysis techniques will be explored for application in different metallurgical systems.
44
Pulli, Kari. "Surface reconstruction and display from range and color data /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/6952.
Full text
45
Wild, Robert John. "Theoretical Studies of Crystallisation in Hard Sphere Systems." University of Sydney. Chemistry, 2004. http://hdl.handle.net/2123/646.
Full textAbstract:
The primary focus of this work is to develop an understanding of crystallisation in hard sphere systems. The thesis is presented in two parts. The first section is an investigation of the liquid/crystal interface at equilibrium using molecular dynamical simulations. The objective is to understand how the interface might bridge between the disordered and ordered states in liquid/crystal environments. Topological measures of structure are used to investigate whether any precursor structures are present in the liquid phase, close to the interface, that would allow transition from disorder to order. This differs from other work where simpler measures of structure, classifying phases into either liquid or crystal, are used. The results indicate that the liquid/crystal interface of a hard sphere system is very narrow and no readily observable structures were found that extended past the width of the equilibrium interface. The second section of the thesis is a theoretical study of growth kinetics in hard sphere systems using density functional theory. The kinetics in a fixed volume are examined with a single conserved order parameter. The work is extended incorporating both conserved particle and non-conserved structure dynamics. The kinetics of growth are examined and it is shown that the small initial crystals are quickly isolated from the higher pressure of the surrounding system through the development of a depletion zone.
46
Payne, Kathryn Elizabeth Ann. "Pigment-dispersant-solvent interactions appropriate to paint systems." Thesis, London South Bank University, 1998. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267389.
Full text
47
Hong, SeungBum S. M. Massachusetts Institute of Technology. "Design of power systems for extensible surface mobility systems on the Moon and Mars." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42193.
Full textAbstract:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2007.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 99-101).
This thesis presents the power system model description and sample studies for extensible surface mobility systems on the Moon and Mars. The mathematical model of power systems for planetary vehicles was developed in order to estimate power system configuration with given mission parameters and vehicle specifications. The state-of-art power source technologies for space application were used for constructing the model; batteries, fuel cells, and photovoltaic systems were considered in this thesis. The Sequential Quadratic Programming method was used to find the optimal power system configurations based on the concept of a previous MIT study. Several case studies on the Moon and Mars were carried out to show the usefulness of the model and to recommend power system configurations for 7-day off-base exploration missions on the Moon and Mars. For the lunar mission, photovoltaic and fuel cell hybrid power systems were suggested. In addition, vehicles with photovoltaic/fuel cell hybrid systems could be operated without recharging when they were driving in shadowed regions. For the Mars mission, both fuel cell single power systems and photovoltaic/fuel cell hybrid systems were acceptable for short missions of only a few days. However, if long, sustainable missions were considered, photovoltaic/fuel cell hybrid systems were required.
by SeungBum Hong.
S.M.
48
Furnell, G. D. "A study of acoustic wave propagation within curved ducting systems /." Title page, table of contents and abstract only, 1989. http://web4.library.adelaide.edu.au/theses/09PH/09phf987.pdf.
Full text
49
Smith, Roy M. "Using kill-chain analysis to develop surface ship CONOPS to defend against anti-ship cruise missiles." Thesis, Monterey, California : Naval Postgraduate School, 2010. http://edocs.nps.edu/npspubs/scholarly/theses/2010/Jun/10Jun%5FSmith%5FRoy.pdf.
Full textAbstract:
Thesis (M.S. in Systems Engineering Management)--Naval Postgraduate School, June 2010.Thesis Advisor(s): Green, J. M.; Second Reader: Hart, D. A. "June 2010." Description based on title screen as viewed on July 14, 2010. Author(s) subject terms: Anti-ship Cruise Missile, ASCAM, Survivability, Probability, Kill Chain, Monte Carlo, Decision Tree, Surface to Air Missile, Close in Weapon System, Countermeasures. Includes bibliographical references (p. 49-50). Also available in print.
50
Thoreson, Erik J. "From nanoscale to macroscale using the atomic force microscope to quantify the role of few-asperity contacts in adhesion." Link to electronic dissertation, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-010906-204218/.
Full text