Дисертації з теми "Controlled and field conditions"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Controlled and field conditions".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Al, Masri Ali [Verfasser]. "Application of proximal sensing techniques for epidemiological investigations of Fusarium head blight in wheat under field and controlled conditions / Ali Al Masri." Bonn : Universitäts- und Landesbibliothek Bonn, 2018. http://d-nb.info/1155922778/34.
Повний текст джерелаBeckers, Felix [Verfasser]. "Mobilization, Methylation, and Ethylation of Mercury in Contaminated Floodplain Soils under Controlled Laboratory Redox Conditions as Influenced by Potential Immobilizing Agents as well as Mobilization of Mercury under Field Conditions / Felix Beckers." Wuppertal : Universitätsbibliothek Wuppertal, 2019. http://d-nb.info/1206122870/34.
Повний текст джерелаBredemeier, Christian [Verfasser]. "Laser-induced chlorophyll fluorescence sensing as a tool for site-specific nitrogen fertilization – evaluation under controlled environmental and field conditions in wheat and maize / Christian Bredemeier." Aachen : Shaker, 2005. http://d-nb.info/1181614112/34.
Повний текст джерелаNeu, Silke [Verfasser], E. Gert [Gutachter] Dudel, Karl-Heinz [Gutachter] Feger, and Hermann [Gutachter] Heilmeier. "Assessment of gentle remediation options for trace element-contaminated agricultural land under semi-controlled and field conditions / Silke Neu ; Gutachter: E. Gert Dudel, Karl-Heinz Feger, Hermann Heilmeier." Dresden : Technische Universität Dresden, 2020. http://d-nb.info/1231917504/34.
Повний текст джерелаDanielsen, Lara [Verfasser], Andrea [Akademischer Betreuer] Polle, and Stefan [Akademischer Betreuer] Scheu. "Fungal diversity in a transgenic poplar plantation and the role of ectomycorrhizal fungi for tree performance under field and controlled drought stress conditions / Lara Danielsen. Gutachter: Andrea Polle ; Stefan Scheu. Betreuer: Andrea Polle." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2013. http://d-nb.info/1044361697/34.
Повний текст джерелаLopisso, Daniel Teshome Verfasser], Andreas von [Akademischer Betreuer] Tiedemann, Petr [Gutachter] Karlovsky, and Heiko [Gutachter] [Becker. "Studies on Resistance of Oilseed Rape (Brassica napus) to Verticillium longisporum – Interaction with Drought Stress, Role of Xylem Sap Modulations and Phenotyping Under Controlled and Field Conditions / Daniel Teshome Lopisso ; Gutachter: Petr Karlovsky, Heiko C. Becker ; Betreuer: Andreas von Tiedemann." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://d-nb.info/1120701996/34.
Повний текст джерелаSong, Haiwen. "Diesel soot oxidation under controlled conditions." Thesis, Brunel University, 2003. http://bura.brunel.ac.uk/handle/2438/4814.
Повний текст джерелаThomas, Sophie. "Pressions de sélection exercées par les résistances génétiques du melon sur les populations d’Aphis gossypii." Thesis, Avignon, 2011. http://www.theses.fr/2011AVIG0637/document.
Повний текст джерелаThe adaptive response of pest populations to selection pressures exerted by agricultural activities determines the sustainability of control methods. In melon, the Vat gene that confers resistance to Aphis gossypii has been deployed for over 10 years, so there are fears it will be overcome. The challenge is to provide strategic elements to plant breeders, concerning the risk of development of virulent aphids, in order to develop new varieties with durable resistances. In the context of this PhD, we have : i) Estimated the available genetic diversity in populations of A. gossypii from different melongrowing areas. The diversity is structured geographically. The great diversity observed in France would have its origine in part from the events of sexual reproduction, suggesting a high evolutionary potential of A. gossypii. ii) Estimated the selection pressure exerted by different resistance combinations (Vat gene and QTLs) on these populations. Population densities are lower on VatR plants than VatS plants and population genetic structure is altered in certain growing areas when the VatR gene is present. The clones multiplying on VatR plants have good fitness and the risk of their spreading is great. No effect of QTLs has been identified in the field. iii) Characterized the clones overcoming the VatR gene. Our results suggest that the adaptation of clones made either by alteration of the avirulence gene of aphids or by adaptation of aphids toresistance effectors. New strategies for Vat resistance management are proposed
Hackston, Abigail Jane. "Activation of faulting under controlled stress conditions." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/activation-of-faulting-under-controlled-stress-conditions(2eb0b3f9-33c4-43d3-bbf2-490744f94d23).html.
Повний текст джерелаCumbria, Neil M. "Robust controlled flux estimation for indirect field-oriented controlled induction motor drives." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0023/MQ31386.pdf.
Повний текст джерелаJordan, Marie-Odile. "Mise en place du systeme racinaire du mais : definition et caracterisation au champ et en conditions controlees des parametres descriptifs du systeme racinaire, construction de l'organigramme d'un modele cinetique." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13329.
Повний текст джерелаSmith, C. J. "Energy conditions in quantum field theory." Thesis, University of York, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434155.
Повний текст джерелаWestmoreland, Shawn. "Energy conditions and scalar field cosmology." Kansas State University, 2013. http://hdl.handle.net/2097/15811.
Повний текст джерелаDepartment of Physics
Bharat Ratra
In this report, we discuss the four standard energy conditions of General Relativity (null, weak, dominant, and strong) and investigate their cosmological consequences. We note that these energy conditions can be compatible with cosmic acceleration provided that a repulsive cosmological constant exists and the acceleration stays within certain bounds. Scalar fields and dark energy, and their relationships to the energy conditions, are also discussed. Special attention is paid to the 1988 Ratra-Peebles scalar field model, which is notable in that it provides a physical self-consistent framework for the phenomenology of dark energy. Appendix B, which is part of joint-research with Anatoly Pavlov, Khaled Saaidi, and Bharat Ratra, reports on the existence of the Ratra-Peebles scalar field tracker solution in a curvature-dominated universe, and discusses the problem of investigating the evolution of long-wavelength inhomogeneities in this solution while taking into account the gravitational back-reaction (in the linear perturbative approximation).
Loginova, Irina. "Phase-field modeling of diffusion controlled phase transformations." Doctoral thesis, KTH, Mechanics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3626.
Повний текст джерелаDiffusion controlled phase transformations are studied bymeans of the phase-field method. Morphological evolution ofdendrites, grains and Widmanst\"atten plates is modeled andsimulated.
Growth of dendrites into highly supersaturated liquids ismodeled for binary alloy solidification. Phase-field equationsthat involve both temperature and solute redistribution areformulated. It is demonstrated that while at low undercoolingheat diffusion does not affect the growth of dendrites, i.e.solidification is nearly isothermal, at high cooling rates thesupersaturation is replaced by the thermal undercooling as thedriving force for growth.
In experiments many crystals with different orientationsnucleate. The growth of randomly oriented dendrites, theirsubsequent impingement ant formation of grain boundaries arestudied in two dimensions using the FEM on adaptive grids.
The structure of dendrites is determined by growthconditions and physical parameters of the solidifying material.Effects of the undercooling and anisotropic surface energy onthe crystal morphology are investigated. Transition betweenseaweeds, doublons and dendrites solidifying out of puresubstance is studied and compared to experimental data. Two-and three-dimensional simulations are performed in parallel onadaptive and uniform meshes.
A phase-field method based on the Gibbs energy functional isformulated for ferrite to austenite phase transformation inFe-C. In combination with the solute drag model, transitionbetween diffusion controlled and massive transformations as afunction of C concentration and temperature is established byperforming a large number of one dimensional calculations withreal physical parameters. In two dimensions, growth ofWidmanstaetten plates is governed by the highly anisotropicsurface energy. It is found that the plate tip can beapproximated as sharp, in agreement with experiments.
Keywords:heat and solute diffusion, solidification,solid-solid phase transformation, microstructure, crystalgrowth, dendrite, grain boundary, Widmanstaetten plate,phase-field, adaptive mesh generation, FEM.
Ciccarelli, Chiara. "Magnetically controlled chemical potential in field effect devices." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/265543.
Повний текст джерелаBas, Gokcen. "Electric Field Analysis In Stress Controlled High Voltage Cables." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605778/index.pdf.
Повний текст джерелаGomm, James Barry. "On-line detection of fault conditions in controlled industrial processes." Thesis, Liverpool John Moores University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304482.
Повний текст джерелаTecle, Aregai, Peter Kitanidis, and Martin Reinhard. "Biodegradability of BTEX Contaminants Under Natural Field Conditions." Arizona-Nevada Academy of Science, 1997. http://hdl.handle.net/10150/296486.
Повний текст джерелаKorbman, Michael. "Modeling light-field-controlled electron motion in atoms and solids." Diss., Ludwig-Maximilians-Universität München, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-159586.
Повний текст джерелаNeueste Fortschritte im Bereich der Lasertechnologie erweitern schnell die Grenzen der Forschung. Quantendynamiken koennen genauer den je untersucht werden, aus kuerzeren Zeitskalen und mit einer hoeheren Kontrollebene. Diese Entwicklung bietet neue Moeglichkeiten, fundamentale Prozesse theoretisch zu untersuchen; darueber hinaus ist ein Verstaendnis der zu Grunde liegenden physikalischen Vorgaenge erforderlich, um Messresultate zu erklaeren und moegliche Richtungen fuer kuenftige Experimente aufzuzeigen. Diese Doktorarbeit befasst sich mit der theoretischen Analyse bestimmter Licht-Materie-Wechselwirkungen in Atomen und Dielektrika. Die im Rahmen dieser Thesis untersuchten Bereiche sind aktuell Thema intensiver Forschung. Dank weiterer technologischer Entwicklungen, die Experimente in diesen Bereichen ausfuehrbar machen, gewinnen sie immer weiter an Relevanz.Neueste Fortschritte im Bereich der Lasertechnologie erweitern schnell die Grenzen der Forschung. Quantendynamiken koennen genauer den je untersucht werden, aus kuerzeren Zeitskalen und mit einer hoeheren Kontrollebene. Diese Entwicklung bietet neue Moeglichkeiten, fundamentale Prozesse theoretisch zu untersuchen; darueber hinaus ist ein Verstaendnis der zu Grunde liegenden physikalischen Vorgaenge erforderlich, um Messresultate zu erklaeren und moegliche Richtungen fuer kuenftige Experimente aufzuzeigen. Diese Doktorarbeit befasst sich mit der theoretischen Analyse bestimmter Licht-Materie-Wechselwirkungen in Atomen und Dielektrika. Die im Rahmen dieser Thesis untersuchten Bereiche sind aktuell Thema intensiver Forschung. Dank weiterer technologischer Entwicklungen, die Experimente in diesen Bereichen ausfuehrbar machen, gewinnen sie immer weiter an Relevanz. Im ersten Teil der Arbeit beschreibe ich den fundamentalen Prozess der atomaren Ionisation durch ein einzelnes Photon. Mein Model enthaelt einen ultrakurzen Lichtpuls mit einer Halbwertsbreite von ~ 100 as = 10^-16 s, der ein Elektron in das Kontinuum anregt, sowie einen starkes Laserfeld im nahen infraroten Spektralbereich mit wenigen Zyklen. Diese Konfiguration erlaubt die Nachbildung von neuesten Streaking Experimenten an Atomen. Ich habe ein numerisches Werkzeug entwickelt, um diese Dynamiken in drei Dimensionen zu simulieren. Der Prozess ist sehr komplex und bedarf einer hinreichenden Beschreibung von Atomen mit mehreren Elektronen. Unter Beruecksichtigung geeigneter Naeherungen war es mir moeglich, Photoelektronenspektren mit Hilfe nur weniger Dipolmatrixelemente zu berechnen, welche in Zusammenarbeit mit unseren externen Kollaborationspartner durch verfeinerte Atomstruktur-Berechnungen bestimmt wurden. Die Ergebnisse unseres verhaeltnismaeßig einfachen Vorgehens stimmen in einem hohen Grad mit fortgeschritteneren numerischen Methoden ueberein. Darueber hinaus diskutiere ich meinen Beitrag zur theoretischen Unterstuetzung eines grundlegenden Experiments. Sowohl Simulationen als auch Messungen weisen auf eine Verzoegerung zwischen zwei Photoemissionskanaelen in Neon hin. Eine sorgfaeltige Pruefung der Gueltigkeit der verwendeten Naeherungen verraet, dass die Coulomb-Volkov Naeherung nicht geeignet ist, um feine Einzelheiten in der Wechselwirkung mit dem Laserpuls zu beschreiben. Außerdem berichte ich ueber unsere Analyse der Messdaten der winkelaufgeloesten Attosekunden Streaking Experimente. Der zweite Teil der Thesis widmet sich der Untersuchung von Interband-Anregungen in Dielektrika. Die kontrollierte Lenkung dieser Ue bergaenge wurde erst mit aktuellster Technologie ermeoglicht. Die ultraschnelle Erzeugung von Ladungstraegern in einem Isolator ist bemerkenswert. Die dielektrischen Eigenschaften aendern sich dramatisch, was Rueckschluesse auf die Elektronendynamik waehrend dieser Anregung zulaesst. Ich habe diesen Prozess durch Loesung der zeitabhaengigen Schroedingergleichung fuer ein einzelnes Elektron in einem eindimensionalen Gitter simuliert und untersucht, wie sich die waehrend des Lichtpulses verlagerte Ladung mit den Laserparametern aendert. Diese Berechnungen reproduzieren in hohem Maße das im Experiment beobachtete Verhalten. Sowohl Theorie als auch Experiment weisen auf eine starke Abhaengigkeit der Ladung von den Laserparametern hin. Dies verspricht ein hohes Maß an Kontrolle und deutet auf eine moegliche Anwendung eines Festkoerperbauelements fuer die Charakterisierung eines optischen Pulses hin. Außerdem untersuche ich detailliert die Modifikationen der elektrischen Antwort des Samples auf ein externes elektrisches Feld. Das Ziel dieser Analyse ist die Identifikation einiger Eigenschaften die direkt mit der Dynamik der erzeugten Ladungstraeger zusammenhaengen. Waehrend der Untersuchung der Elektronendynamiken in einem Anregungsprozeß, stieß ich oft auf die Problematik, Groeßen zu ermitteln, die Eigenzustaenden des zeitabhaengigen Hamilton- Operators aehneln koennten. Aehnliche “Field-dressed States” wuerden die Verzerrung der Eigenzusteande des feldfreien Hamiltonoperators aufgrund des Felds beschreiben. Eine geeignete Definition der Field-dressed States wuerde eine korrekte Interpretation der Wellenfunktion in Abhaengigkeit der instantanen angeregten Besetzung ermoeglichen, welche sich auf anderem Wege nicht bestimmen laesst.
Sandoval, Aleida J. "Studies of wheat starch transformations in a controlled shear field." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311378.
Повний текст джерелаTu, Ryan H. "Germanium nanowire controlled synthesis, alignment, and field-effect-transistor characteristics /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Повний текст джерелаSebastian, Dalys. "Development of a field-deployable voice-controlled ultrasound scanner system." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0625104-170951/.
Повний текст джерелаMcAlister, Darrell Scott. "Analysis of energy flow in controlled structures subject to initial conditions." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-02132009-172708/.
Повний текст джерелаKopec, D. M., R. Scott, B. D. Munda, M. J. Pater, C. F. Mancino, and A. E. Ralowicz. "Germination of Lehman Lovegrass and Black Grama Under Controlled Environment Conditions." College of Agriculture, University of Arizona (Tucson, AZ), 1989. http://hdl.handle.net/10150/216078.
Повний текст джерелаBaserinia, Reza. "Flow of fine and cohesive powders under controlled air pressure conditions." Thesis, University of Leicester, 2017. http://hdl.handle.net/2381/39826.
Повний текст джерелаAramrun, P. "Measuring terrestrial wildlife external radiation exposure under field conditions." Thesis, University of Salford, 2018. http://usir.salford.ac.uk/47703/.
Повний текст джерелаMichael, Joseph R. Jr. "Field conditions : the stadium, the city, and the masses." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/57527.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student submitted PDF version of thesis.
Includes bibliographical references (p. 136-137).
The past 30 years has seen the emergence of two seemingly unrelated problems: The first problem is the underperformance and looming demolition of Boston City Hall and the unavoidable commercial development of its plaza. The problems of City Hall and its plaza, however, are part of a larger misguided notion of public space for the masses--how, when, and by whom it is occupied. The masses, however, have always and will continue to gather regularly for the ritual of sport. This raises the second problem--the continued suburbanization of the stadium has taken the most dynamic urban spectacle out of the city. To compound this problem, sports franchises use competing cities' desire to host one of a limited set of professional teams as leverage for stadium building. If a city refuses to finance new facilities, a franchise will find another more desperate city willing to put up the funding. Stadia, costly and iconic structures, have an extremely brief shelf life, and though heavily publically funded are almost entirely private. Boston is a self-proclaimed "Titletown." In celebration of sports is the only time that citizens gather en masse in Boston City Hall's public plaza. The iconic Boston City Hall, unlike stadiums, is stubbornly permanent and universally despised. The convergence of these two problems results in a proposal for a new kind of urban form and public space in the heart of Boston. This thesis proposes a new kind of stadium for the City Hall site, one that is not hermetically sealed for only sporting events, but one that engages the city with a high degree of porosity.
(cont.) The inevitable obsolescence of stadia will not be ignored; therefore, this proposal aims to create an urban form which is highly activated independently of sporting events. This proposal also seeks to insert a new kind of public space within a city: one that is of the highly organized and functioning spectacle of a sporting event, and one that is of the modern flâneur.
by Joseph R. Michael, Jr.
M.Arch.
Hills, Daniel. "Generating boundary conditions for integrable field theories using defects." Thesis, University of York, 2016. http://etheses.whiterose.ac.uk/16379/.
Повний текст джерелаJouan, Alexis. "DC and AC transport in field-effect controlled LaAlO3/SrTiO3 interface." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066073/document.
Повний текст джерелаThis thesis is devoted to the study of static and dynamical transport properties of the superconducting two-dimensional electron gas at the LaAlO3/SrTiO3 interface. Under strong 2D confinement, the degeneracy of the t$_{2g}$ bands of SrTiO$_3$ is lifted at the interface, generating a rich and complex band structure. Starting from a free electron model, we derive numerically a self-consistent calculation of the potential well and the band structure (chapter 1). These simulations highlight the presence of two types of bands d$_{xy}$ and d$_{xz/yz}$ with very different transport properties. We investigate first the effect of microscopic disorder introduced by Cr doping, on superconductivity and spin-orbit coupling over a wide range of back-gate doping (chapter 3). We also describe the first implementation of a field-effect device where the superconductor-insulator transition could be continuously tuned with a top-gate. The presence of a strong spin-orbit coupling that could be controlled with the top-gate voltage is also demonstrated by analyzing the magneto-transport measurements. The gate dependence of the spin-splitting energy, of the order of a few meV, is found to be consistent with Rashba spin-orbit coupling. Going one step further in nanofabrication, we report on the first realization of a quantum point contact in LaAlO$_3$/SrTiO$_3$ using split gates (chapter 6). To go further in the understanding of the LaAlO$_3$/SrTiO$_3$ interface, we present high frequency measurements of the conductivity $\sigma$ (chapter 5). This measurement gives us access to the superfluid stiffness and to the gap energy via the BCS theory. We show that the competition between these two energy scales controls the superconducting Tc in the phase diagram
Legesse, Michael. "Coupled simulation of an indirect field oriented controlled induction motor drive." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116014.
Повний текст джерелаBal, Gungor. "Performance analysis of field-orientation controlled induction motor with parameter adaptation." Thesis, University of Strathclyde, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392468.
Повний текст джерелаAntunes, Fernando Luiz Marcelo. "A microprocessor-controlled DC servo-drive with spill-over field weakening." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/33224.
Повний текст джерелаWissman, James P. "Selected Methods for Field-Controlled Reconfiguration of Soft-Matter Electrical Contacts." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/920.
Повний текст джерелаBawana, Niyem Mawenbe. "Thermal Response in a Field Oriented Controlled Three-phase Induction Motor." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7740.
Повний текст джерелаNowakowska, Anna Maria. "Visual search strategies under normal viewing conditions, and under conditions that simulate visual field deficit." Thesis, University of Aberdeen, 2018. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=239258.
Повний текст джерелаKabadshow, Ivo [Verfasser]. "Periodic Boundary Conditions and the Error-Controlled Fast Multipole Method / Ivo Kabadshow." Wuppertal : Universitätsbibliothek Wuppertal, 2012. http://d-nb.info/1020476176/34.
Повний текст джерелаTuffrey, Nigel Edwin. "Pyrometry studies of the combustion of lead concentrate particles under controlled conditions." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/29309.
Повний текст джерелаApplied Science, Faculty of
Materials Engineering, Department of
Graduate
Gorkowski, Kyle J. "The Morphology and Equilibration of Levitated Secondary Organic Particles Under Controlled Conditions." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/1067.
Повний текст джерелаBent, Denzil. "A comparison of Brine evaporation rates under controlled conditions in a laboratory." University of the Western Cape, 2018. http://hdl.handle.net/11394/6443.
Повний текст джерелаThere are growing concerns around the environmental issues related to processed water as the demand for potable water is on the increase in South Africa. Effluents discharged from various sectors such as water treatment facilities pose a constant threat to the environment and natural water resources, including rivers and groundwater due to their poor chemical and physical composition. As a result, the demand for predicting the elevated concentrations of salts in a spatial and temporal dimension is constantly growing. The effluent at the eMalahleni water reclamation plant in Mpumalanga, South Africa, is being processed through a triple reverse osmosis that improves the water quality of the mine water to potable standards. Two water quality streams emerge from this process, i.e. a potable standard and the other a brine concentrate which is stored in ponds. Brine ponds are used for inland brine disposal in the eMalahleni water reclamation plant. The large volumes and limited capacity to store brines has placed great emphasis on enhanced evaporation rates to increase the efficiency of the ponds. In order to improve the rate of brine evaporation in the pond, an understanding of the effect of brine salt content and other parameters affecting the rate of evaporation is required. This study aimed at establishing the physical and chemical behaviour of the brine from the eMalahleni plant in a controlled environment. The investigation incorporated actual brine from the eMalahleni plant as well as synthetic salts typical of the major components of the eMalahleni brine.
Razavi, Seyed Esmail. "Far field boundary conditions for computation of compressible aerodynamic flows." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28896.
Повний текст джерелаThe proposed FFBC model is implemented in conjunction with an implicit finite-difference flow field solver using an alternating direction implicit (ADI) scheme for solving the Euler equations. The discretized form of the governing equations are solved using a time-marching technique until the steady-state solution is reached. An accurate procedure for the solid boundary treatment was also used.
The proposed FFBC model was used for solving typical problems of confined and external compressible flows in subsonic and transonic regimes. For the transonic regime, the proposed FFBC model has been extended for the case of non-isentrophic outgoing flows, which appear behind the shock waves. The solutions obtained are compared with previous theoretical and numerical results. This comparison shows that the proposed FFBC model can generate accurate solutions using a substantially reduced computational domain, which reduces by an order of magnitude the size of the block tridiagonal matrices to be inverted. This leads to a corresponding improvement in the overall computational efficiency.
Potgieter, Carl Edzard. "Evaluation of resin-based fissure sealants placed under field conditions." Thesis, University of the Western Cape, 2015. http://hdl.handle.net/11394/5030.
Повний текст джерелаBACKGROUND: The application of dental sealants is a recommended procedure to prevent and control dental caries. However, despite strong evidence for the safety and effectiveness of dental sealants, their use still remains low, especially among children from lower socioeconomic communities. The World Health Organization (WHO), Centres for Disease Control and Prevention (CDC) and the Association of State and Territorial Dental Directors (ASTDD) strongly endorse the implementation of school based dental sealant programmes as a community-based preventive strategy to increase sealant use and reduce dental caries. However, in the WHO African Region, oral health is seen as a very low priority and this is compounded by limited technical and managerial resources. The availability of human resources and equipment are crucial for the successful placement of dental sealants. A gap in the research literature was identified for determining the effectiveness of fissure sealants placed under field conditions. AIM: To evaluate the caries preventive effect as well as retention status of a resin-based fissure sealant that was placed under field conditions as part of a school based sealant programme. METHODOLOGY: A cross-sectional comparative study was conducted at two primary schools in close proximity of each other in the same low socio-economic area in Beaufort West, South Africa. The study population consisted of grade two children between the ages of 7-9 years who had fully erupted first permanent molar teeth. The case group consisted of 100 learners who received dental sealants on caries-free first permanent molar teeth 12 months earlier. The control group consisted of a random selection of the same number of learners from the adjacent school. Dental caries on the occlusal surfaces of the first permanent molar teeth was detected by making use of the decayed (D) portion of the decayed, missing and filled tooth (DMFT) score, while a separate diagnosis distinguished between cavitated and non-cavitated lesions. Sealant retention was determined by a calibrated examiner who was not involved in the placement of the sealants. RESULTS: The response rate of the study was 80.0% (n=100) and 78.9% (n=356) of the fissure sealants that were originally placed were evaluated. When the sealants were placed in 2013, 52.0% of the children were female and at the 12 month follow-up, 51.3% were female. The average age of the female children at follow-up was 8 years and 4 months (99.9 months) and 8 years and 5 months (101.8 months) for the males. The standard deviation of the gender profiles differed by 1 month only and implies an equal distribution of age between female and male children throughout the study. Just less than ten per cent (7.8%) of the sealants were fully intact at the 12 month follow-up examination and 91% were totally lost, which is a higher sealant loss rate than what is generally reported on in the literature. Of the 7.8% fully retained sealants, a statistically significant proportion (p=0.044) were found on the mandibular molar teeth. The caries incidence rate in the sealed group was 7.1% versus 9.1% in the control group. Relative risk (RR) calculations was slightly lower for the sealed (RR=0.79) than the unsealed (RR=1.02) teeth. CONCLUSION: The study showed a 2% lower caries prevalence rate on the occlusal surfaces of the sealed versus the unsealed teeth. However, this does not represent a statistically significant finding (P=0.39). The study also showed a low retention rate for the resin-based sealants placed under field conditions (12 month retention rate of 7.8%). The results from this study has therefore shown that resin-based fissure sealants placed on grade 1 learners under field conditions appear to be not ideal in preventing the onset of dental caries on the occlusal surfaces of the first permanent molar teeth.
Coons, J., J. McGrady, and N. Simons. "Thermodormancy of Several Lettuce Cultivars in Laboratory vs. Field Conditions." College of Agriculture, University of Arizona (Tucson, AZ), 1988. http://hdl.handle.net/10150/214151.
Повний текст джерелаGebreselassie, Hailemichael. "Iron supplementation and malaria infection, results of a randomized controlled field trial." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ29944.pdf.
Повний текст джерелаGebreselassie, Hailemichael. "Iron supplementation and malaria infection : results of a randomized controlled field trial." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=42040.
Повний текст джерелаA randomized, double-blind, placebo-controlled field trial of oral ferrous sulphate supplementation in schoolchildren 5 to 14 years of age was carried out in northwest Ethiopia where transmission of malaria is high. A total of 500 school children, all with mild-to-moderate iron deficiency, were randomly assigned to receive either ferrous sulphate (60 mg elemental iron per day) or a look-alike placebo, over a period of 12 weeks. Follow-up continued for 24 weeks post-randomization.
Children who received iron supplementation tended to develop more clinical attacks of malaria than those children who received placebo, although the difference between the groups was not statistically significant, either during the initial 12 week supplementation period (RR = 1.59; 95% CI: 0.92-2.75) or during the 24 weeks of follow-up (RR = 1.45; 95% CI: 0.95-2.20). Similarly, a trend of increased risk of malaria infection (parasitemia) was noted in the iron-supplemented group over the 24 week follow-up period (RR = 1.22; 95% CI: 0.98-1.52). No difference in any other outcome measure (spleen rate, average enlarged spleen index, and parasite density index) was observed between the groups either during the 12 weeks of supplementation or the 24 weeks of follow-up.
This study suggests that iron supplementation, in areas where iron deficiency and malaria co-occur, may enhance host susceptibility to malaria infection. Thus, approaches to control or prevent iron deficiency anaemia in malaria endemic areas should be integrated with malaria control activities in order to minimize the unintended effects of malaria infection while providing the greatest benefit.
Wan, Junjun. "Towards the realization of an all electrically controlled Spin Field Effect Transistor." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1292519781.
Повний текст джерелаGao, Wenzhu. "Hierarchically Controlled Helical Polyacetylenes Synthesized in Advanced Asymmetric Liquid Crystal Reaction Field." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/124552.
Повний текст джерелаLi, Melissa M. EngMassachusetts Institute of Technology. "Photoluminescent quantum-dot light emitting devices controlled by electric field induced quenching." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123210.
Повний текст джерелаThesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2019
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 61-63).
Colloidal quantum dots (QDs) have been promising luminophores due to their bright, pure, and tunable colors. The ability to control the emission properties of QDs has far-reaching potential applications for a new generation of display and lighting technologies. The emission control of QDs in a QD light-emitting device (LED) is usually achieved by changing the injection current density. However, these devices face issues with lifetime and stability as well as low external quantum efficiency (EQE) at high biases. In this thesis, we demonstrate a unique approach in operating a QD device that avoids these limitations. The device is a photoluminescent LED (PL-LED) where the emission from the LED is from optical excitation. To tune the emission, we apply a bias to intentionally dim or turn off the QD PL, using the PL quenching at high biases to our advantage. We also study the field-induced quenching mechanisms using capacitor structured PL-LEDs and QD-LEDs. Traditional electroluminescent QD-LEDs can be used as a PL-LED when operated under reverse bias. We propose that the electric-field induced quenching in our devices is due to exciton dissociation and reduced band-edge exciton formation at high field strengths. The resulting QD PL device exhibits voltage-controlled PL quenching up to 99.5%, corresponding to a high contrast ratio of 200:1, and a sub-microsecond response time. Our demonstration of PL tunability can lead to a new class of devices for fluorescent displays and voltage-controlled devices.
by Melissa Li.
M. Eng.
M.Eng. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
Svanholm, Ulrika. "Evaluation of measurements of pulsating flow under controlled conditions using phase contrast MRI." Thesis, Stockholm University, Medical Radiation Physics (together with KI), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7222.
Повний текст джерелаThe accuracy and precision of measurements of pulsating flow obtained with phase contrast magnetic resonance imaging (PC MRI) was studied. Measurements were carried out using known flow rates through a phantom connected to a pump that created pulsation in the flow. Repeated measurements were made in both the negative and positive encoding direction, using both breath-hold and non breath hold sequences. The obtained data was analyzed using code written in MATLAB and also using the FLOW software that is offered by the manufacturer of the MRI system.
A range of different flow velocities was scanned, and results show that the overall accuracy of the measurements is relatively good, with an average error of between 1.2% to 5.7% using the clinically employed flow calculation software. There is however indication of a systematic phase offset in the data that influences the measurements. The effect of the offset on the results depends on the direction of flow and the sequence used. The results also show the importance of properly selecting the area over which the flow rate is calculated.
Gulzar, Muhammad. "Dry heating of whey proteins under controlled physiocochdemical conditions : structures, inteactions and functionalities." Rennes, Agrocampus Ouest, 2011. http://www.theses.fr/2011NSARB220.
Повний текст джерелаDry heating is a pre-texturization process for food protein ingredients to improve their techno-functional properties (gelling, foaming, and emulsifying). The aim of this thesis was to identify the physicochemical characteristics of whey powders that modulate the structural changes of proteins during dry heating and the gelling properties of dry heated proteins. For this purpose, whey powders with various physicochemical characteristics in terms of pH, water activity, and composition (protein ratio, trace of calcium and lactose) were dry heated under different heat intensities (temperature/times). The water activity of the powder and dry heat intensity (temperature/times) accelerate the kinetic of denaturation/aggregation of whey proteins. Trace of lactose and pH also affect the structure of dry heated proteins. At pH 2. 5 the protein molecules were mainly linked together by intermolecular disulfide bonds, while at pH 6. 5, covalent cross-links other than disulfide bonds were also involved in formed aggregates. Depending upon its nature (free or fixed to proteins) and pH of powder, the lactose affects differently the denaturation/aggregation of whey proteins. In addition, non-native protein monomers having mass loss of 18 Da were also generated. Depending upon the quantity of soluble and insoluble aggregates of proteins, the gelling properties were changed. These results show the dominance of certain physicochemical characteristics of powder on protein structure modifications and their gelling properties, thus giving indications for improving the reproducibility of the functionality of dry heated protein ingredients at the industry
Ieamsupapong, Supat. "Mechanisms of Iron Carbonate Formation on Mild Steel in Controlled Water Chemistry Conditions." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1473264400862079.
Повний текст джерела