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Dau, Hai Dang. "Sequential Bayesian Computation". Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAG006.
Pełny tekst źródłaThis thesis is composed of two parts. The first part focuses on Sequential Monte Carlo samplers, a family of algorithms to sample from a sequence of distributions using a combination of importance sampling and Markov chain Monte Carlo (MCMC). We propose an improved version of these samplers which exploits intermediate particles created by the application of multiple MCMC steps. The resulting algorithm has a better performance, is more robust and comes with variance estimators. The second part analyses existing and develops new smoothing algorithms in the context of state space models. Smoothing is a computationally intensive task. While rejection sampling has been proposed as a solution, we prove that it has a highly variable execution time. We develop algorithms which have a more stable computational cost and thus are more suitable for parallel environments. We also extend our framework to handle models with intractable transition densities
Pirie, Tara J. "The role of small private game reserves in leopard Panthera pardus and other carnivore conservation in South Africa". Thesis, University of Reading, 2016. http://centaur.reading.ac.uk/68340/.
Pełny tekst źródłaHolland, Alexander. "John Bromyard's 'Summa Praedicantium' : an exploration of late-medieval falsity through a fourteenth-century preaching handbook". Thesis, University of Kent, 2018. https://kar.kent.ac.uk/68440/.
Pełny tekst źródłaVarley, E. A. "A study of William Van Mildert, Bishop of Durham, and the High Church movement of the early nineteenth century". Thesis, Durham University, 1985. http://etheses.dur.ac.uk/6840/.
Pełny tekst źródłaDunbar, Jill. "The efficacy of a seizure assessment risk tool in predicting occurrence of tonic-clonic seizures". Thesis, University of Glasgow, 2015. http://theses.gla.ac.uk/6840/.
Pełny tekst źródłaMei, Chiara, Manuela Mignani i Selina Morri. "La sostenibile consuetudine della cura: Studi e proposte per protocolli conservativi del centro educativo italo svizzero C.E.I.S". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6840/.
Pełny tekst źródłaScarpazza, Cristina <1985>. "Deficit in the Emotional Embodiment in Alexithymia". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/6840/.
Pełny tekst źródłaXiao. "Experimental study of nanoscale exchange coupling". [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2003. http://dare.uva.nl/document/68540.
Pełny tekst źródłaMohamad, Radziah. "Unity in diversity : an exploration of the suports concept as a design approach to housing in multi-ethnic Malaysia". Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/68740.
Pełny tekst źródłaMark, Shirley. "Asian American engineers in the Massachusetts high technology industry : are glass ceilings a reality?" Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/68240.
Pełny tekst źródłaTitle as it appears in the M.I.T. Graduate List, June 1990: Asian American professionals in the Massachusetts high technology industry.
Includes bibliographical references (leaves 54-56).
by Shirley Mark.
M.C.P.
Anguelovski, Isabelle. "Neighborhood as refuge : environmental justice and community reconstruction in Boston, Barcelona, and Havana". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68440.
Pełny tekst źródłaCataloged from PDF version of thesis.
Includes bibliographical references (p. 253-270).
Environmental Justice (EJ) scholarship has revealed that communities of color and low-income neighborhoods have been disproportionally affected by 'brown' contaminating facilities and excluded from decision-making on their land, and that residents have used a variety of strategies to address such injustices (Bullard 1990, Agyeman 2003, Susskind and Macey 2004, Corburn, 2005, Pellow and Brulle 2005, Schlosberg 2007). However, traditional EJ literature tends to overlook the fact that residents also fight to achieve long-term equitable revitalization and improve the livability and environmental quality of their neighborhoods through parks, playgrounds, community gardens, fresh markets, and improved waste management. Furthermore, previous studies have not examined the role of historic marginalization, threats of displacement, collective identities, and political systems in framing the demands and strategies of these marginalized neighborhoods, especially in different cities and political systems across the world. My dissertation is motivated by this overarching question: How and why do residents of seemingly powerless marginalized neighborhoods proactively organize to improve environmental quality and livability? To answer this question, I focus on three sub-questions: In what ways do residents and organizations engaged in environmental quality initiatives perceive that their work allowed them to re-build their community from within? To what extent do the environmental struggles of marginalized communities represent a desire to achieve environmental gains as opposed to serving as a means to advance broader political agendas in the city? How do different political systems and contexts of urbanization shape the strategies and tactics that neighborhoods develop and how to they manage to advance their goals? My dissertation is built around an international comparative study of three critical and emblematic case studies of minority and low-income neighborhoods organizing for improved environmental quality and livability in three cities - Casc Antic (Barcelona), Dudley (Boston), Cayo Hueso (Havana), - which have all achieved comparable improved environmental and health conditions around parks and playgrounds, sports courts and centers, community gardens, urban farms, farmers' markets, and waste management. During my eight-month fieldwork in Barcelona, Boston, and Havana, I conducted semi-structured interviews with leaders of local organizations and NGOs working on improving environmental conditions, with a sample of active residents in each neighborhood, and with municipal agencies and policy-makers. Furthermore, I engaged in observation of events, as well as participant observation of projects focused on environmental improvements. Last, I collected secondary data on neighborhood development, land use, and environmental and health projects. This study reveals that activists in Casc Antic, Dudley, and Cayo Hueso use their environmental and health endeavors to holistically re-build and repair a broken and devastated community and build safe havens, associating environmental justice with community development, and improvements in physical health with mental health support. They also frame broader political goals in the city such as addressing stigmas about their place, controlling the land and its boundaries, and building a more transgressive and spontaneous form of democracy. These goals reflect and are reinforced by the attachment and sense of community they feel for their neighborhood. To develop their vision, residents select multi-faceted and multi-tiered strategies, which reveal common patterns across neighborhoods despite differences in political systems: collage and bricolage techniques, broad coalitions and sub-community networks, clever engagement with public officials and funders, and local identity and traditions. This research extends EJ theory by focusing on how residents and their supporters make proactive environmental and health claims and defend their vision for improved neighborhood conditions and safety, gain political power, and address inequalities in planning and land use decisions.
by Isabelle Anguelovski.
Ph.D.
Perez, Zuñiga Yoshio Samaizu. "Design of an axial turbine and thermodynamic analysis and testing of a K03 turbocharger". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68540.
Pełny tekst źródłaCataloged from PDF version of thesis.
Includes bibliographical references (p. 65-66).
A novel humidification dehumidification desalination system was developed at the Rohseneow Kendall Heat Transfer Laboratory. The HDH system runs by having different pressures in the humidifier and dehumidifier. One of the components that will keep the different pressures is an expander. The expander specification is to work with a pressure ratio of 1.2 while having a high efficiency. Two approaches were developed to achieve this result, one was through the design of a turbine and the second was through the selection and testing of a car turbocharger. The design of a turbine is given in detail and follows the process given in "Design of High- Efficiency Turbomachinery and Gas Turbines" by David Wilson. The final design of the turbine blades was sand cast. Due to the sand casting process, cavitation on the blade material was shown and testing of the blades was not pursued for fear of fast fracturing. The second option of selecting a turbocharger is shown and the process which led to its selection is explained. Through such process a K03 turbocharger was selected to be suitable to run at the low pressure ratios with a moderate efficiency. Testing of the K03 was conducted. The static-to-static isentropic efficiency calculated was 53% ± 11% for a pressure ratio of 1.2 while the total-to-total isentropic efficiency 60% ± 14% at a pressure ratio of 1.2. The high error associated with the efficiencies are due to the turbine experiencing small temperature drops in the order of 10°C or less. The K03 turbocharger is meant to run at higher pressure ratios, in the order of 2 with a manufacturer specified efficiency of 70%. Running the K03 at a pressure ratio of 1.2 decreases the efficiency since its not specified to run at those low pressure ratios. If a turbine or a turbocharger is designed for the exact specifications of the desalination system, it can work with low pressure ratios and be highly efficient.
by Yoshio Samaizu Perez Zuniga.
S.B.
Guffey, Eric J. (Eric Jemison). "Nitrous oxide as a substitute for sulfur hexafluoride in the ANSI/ASHRAE 110 Method of hood performance evaluation". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68840.
Pełny tekst źródłaCataloged from PDF version of thesis.
Includes bibliographical references (p. 39-40).
The ANSI/ASHRAE 110 Method is the standard test for laboratory hood containment performance. Sulfur hexafluoride is specified as the gas most suitable for this test and is most commonly used. Sulfur hexafluoride use has potential negative environmental repercussions as it is a potent greenhouse gas with a global warming potential 22,800 times greater per mass than CO₂. The purpose of this study is to evaluate nitrous oxide, a much less environmentally destructive tracer gas, as a potential substitute in the ANSI/ASHRAE 110 Method. In accordance with ANSI standards, flow visualization, face velocity, and tracer gas tests were performed on numerous laboratory hoods of varying design. A mannequin was positioned in front of the center of the hood, and a MIRAN SapphlRe was used to measure the presence of each tracer gas. Direct comparisons of the concentrations of the two gases were dominated by a few high concentrations. For this reason, concentrations of both gases were log1O-transformed for statistical analyses. Laboratory hood dimensions and properties were found to affect the relationship between the gases. The hood area of opening and sash height were found to significantly (p<0.001) affect logjo(SF₆/ N₂O). Average face velocity also significantly (p<0.025) affected the log ratio. Neither gas was an adequate indicator of the behavior of the other. The linear best fit of the logs of the concentration ratio had a slope of 0.858, a y-intercept of 0.434, and an R² of 35.9% indicating a poor correlation. For N₂O to qualify as a substitute for SF6 there would need to be a strong correlation between gas concentrations that was consistent independently of hood conditions. This condition was not met. Nitrous oxide was found to not be a suitable substitute for sulfur hexafluoride in the ANSI/ASHRAE 110 Method.
by Eric J. Guffey.
S.B.
Levens, Kurt Antony 1961. "Lighting a building with a single bulb : toward a system for illumination in the 21st c.; or, A centralized illumination system for the efficient decoupling and recovery of lighting related heat". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/68340.
Pełny tekst źródłaIncludes bibliographical references (leaves 227-229).
Piping light represents the first tenable method for recovery and reutilization of lighting related heat. It can do this by preserving the energy generated at the lamp as radiative, departing from precedent and avoiding absorption of and re-emission of radiant heat as convection and conduction. Within thermodynamic limits, the radiant heat generated by an electric lamp or the sun is available for optical concentration and for reconstitution as a high thermodynamic quality power reservoir. Piping light from a large central lamp facilitates the decoupling of lighting related heat at the source, and also means that the efficiency of one central fixture can be stringently optimized instead of the multitude of fixtures it replaces in buildings. Luminous efficacy for a full-spectrum lamp decoupled of its infrared can be shown to approach theoretical limits of 250 lumens/watt. UV generated by the lamp, if coupled along with the illumination into the transport fibers, can be converted into visible radiation at the emitting end of the fiber, supplementing the light output. Fiber optics are used to carry information over long distances (actually encoded pulses of radiative IR), but certain fiber optics can carry tremendous amounts of energy. As fiber optics become more and more plentiful in telecommunications, their prices will come down. Cost and operating expense studies included in the final chapter of this thesis indicate that a large single source with light that is efficiently coupled and piped throughout a building's interior could reduce electric light consumption to one-fourth, and that even at current fiber pricing levels some systems can be competitive in initial cost to conventional lighting. Certain aspects of centralization suggest further reductions in cost and operating expenses such as centralized, instead of localized, relamping and cleaning, and eliminated requirements for thermal, electrical, and structural hardware at room fixture locations. The economic and technical feasibility of a central system depends on the simultaneous minimization of fiber aperture area and energy losses. Thermodynamically, the concentration of light for transport cannot surpass the energy density of the source. So such a system employs, at best, an optical process that preserves the extent of the source. That is, a high brightness source must be used to drive the system, regardless of the lamp's lumen output. High brightness lamps, then, can be viewed as an alternative to high efficacy lamps for increasing the energy performance of lighting systems in buildings. This thesis anticipates the existence of high brightness, high lumen lamps. The sun's 10,000 footcandles in peak conditions can be a potent contributor to the energy efficacy of buildings if a collection and utilization strategy is properly devised. At 100 sq. ft of available illumination for each sq. ft of collected sunlight, a scenario including simultaneous collection and distribution of electric light and heat and sunlight and solar heat in a building could reduce to near zero the energy consumed for lighting during peak sun conditions. Studies in this thesis indicate that an economically driven future role of solar energy in the lighting, heating, and cooling of buildings could very well revolve around keeping sunlight in the form of illumination and sunheat in the form of radiative heat, instead of converting both into electricity via photovoltaics and reconversion of this electricity back into electric light. Conventional lighting is an inefficient process, essentially using heat sources for the light they provide. Not only is lighting related electricity generating predominantly waste heat, this heat must be removed from the building's envelope by an additional input of energy. Even energy saving fluorescent lamps and fixtures produce at least 80% heat. This might serve to explain why 30% of the country's electricity is consumed by lighting. This thesis proposes a method for decoupling and recovery of lighting related heat, and transporting light in lieu of electricity to lighting fixtures (Chapters 2 and 6). Each of the optical components that would comprise such a system is examined. Chapter 7 investigates the radiation source. Chapter 8 develops the source reflector which will direct the source's radiative output in a particular direction. Chapter 9 studies a mirror that will separate the source's radiation beam into a light beam and a heat beam for subsequent processing. Chapter 10 looks at the heat collector that will convert the heat beam into a usable high-temperature power reservoir. Chapter 11 devises the light collector/ concentrator that will facilitate coupling of light energy into a fiber optic transport network. Chapter 12 assembles the constituent components into central modules. Chapter 5 surveys the light transport media, in particular fiber optics and Prism Optical Light Guide, for suitability to building lighting applications. The exact method of solar couplature is not introduced. Sample energy efficiency comparisons, cost and payback scenarios, implementation issues and concepts for room emitters are included in chapter 13. Related concepts for a transparent concentrating solar collector for use as a window or skylight, and a solar concentrating wall are disclosed in the conclusory chapter. Material included in this thesis has been patented by MIT. The usage of such material for any commercial means requires a licensing agreement.
by Kurt Antony Levens.
S.M.
Domínguez, Espinosa Francisco Alonso. "Effect of fabrication parameters on thermophysical properties of sintered wicks". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68940.
Pełny tekst źródłaCataloged from PDF version of thesis.
Includes bibliographical references (p. 134-140).
Porous wicks for use in a loop heat pipe were sintered from copper and Monel powder. These wicks were characterized in terms of their shrinkage, porosity, thermal conductivity, liquid permeability and maximum capillary pressure. The effect of fabrication parameters (particle size and sintering conditions) on these properties was studied. Shrinkage was found to increase with increasing sintering time and temperature. Porosity followed the opposite trend. For a given sintering temperature, thermal conductivity of the samples was found to increase as the sintering time increased. Permeability and capillary pressure were found to be independent of the sintering time as long as the wick stayed bonded to the walls of its container. In addition to measuring the properties of the wicks, a model for predicting their thermal conductivity was developed. First, the so-called 'two-sphere model' is used to relate the sintering conditions to the size of the connections between particles (referred as 'necks'). Then, a finite element simulation was used to determine the thermal resistance of diverse unit cells as a function of the neck size between the particles. Finally a MATLAB simulation program was written to generate a random 3D resistor network as means to model the multiple connections between spheres in a wick. The MATLAB code was used to calculate the effective thermal conductivity of the wick. Comparison of the model predictions with the experimental data showed good agreement.
by Francisco Alonso Dominguez Espinosa.
S.M.
ANTONIO, GAMA VELÁZQUEZ. "FUNCIONES EN EL DESEMPEÑO DEL CARGO COMO ENLACE ADMINISTRATIVO EN LA 39 JUNTA DISTRITAL EJECUTIVA EN EL ESTADO DE MEXICO". Tesis de Licenciatura, Universidad Autónoma del Estado de México, 2017. http://hdl.handle.net/20.500.11799/68040.
Pełny tekst źródłaEstrada, Vilchis Marco Antonio. "EL SERVIDOR PÚBLICO DE CONFIANZA Y EL SERVICIO PROFESIONAL DE CARRERA. MARCO TEÓRICO, PRÁCTICO Y JURÍDICO EN EL ÁMBITO DE LA ADMINISTRACIÓN PÚBLICA FEDERAL". Tesis de Licenciatura, Universidad Autónoma del Estado de México, 2017. http://hdl.handle.net/20.500.11799/68140.
Pełny tekst źródłaGÓMEZ, JUÁREZ OSCAR URIEL. "SÍNTESIS, CARACTERIZACIÓN Y EVALUACIÓN DE UNA MEMBRANA DE BIOMOF BASADO EN ADENINA Y ÁCIDO TRIMESICO PARA SU FUTURA APLICACIÓN EN ADSORCIÓN Y SEPARACIÓN DE GASES". Tesis de Licenciatura, Universidad Autónoma del Estado de México, 2017. http://hdl.handle.net/20.500.11799/68640.
Pełny tekst źródłaGUERRERO, BARCENA MANUEL 231271, i BARCENA MANUEL GUERRERO. "Efecto de la suplementación de clorhidrato de zilpaterol y zinc orgánico en la respuesta productiva, metabólica y calidad de la carne de ovinos en engorda intensiva". Tesis de maestría, Universidad Autónoma del Estado de México, 2017. http://hdl.handle.net/20.500.11799/68540.
Pełny tekst źródłaSANTILLAN, ALVAREZ ANGEL 481406, i ALVAREZ ANGEL SANTILLAN. "Efecto de biopolímeros con extractos antioxidantes sobre la vida útil de un reestructurado cárnico". Tesis de doctorado, Universidad Autónoma del Estado de México, 2018. http://hdl.handle.net/20.500.11799/68340.
Pełny tekst źródłaSe evaluó el efecto de biopolímeros con extractos antioxidantes sobre la vida útil de un restructurado cárnico, almacenado a 4°C. Se llevaron a cabo cuatro etapas, en la primera etapa el reestructurado cárnico fue a base de carpa común (Cyprinus carpio) y cerdo (0:100; 100:0) fortificado con 0-8 g / 100 g de harina de semilla de chía (CSF). Para seleccionar el mejor reestructurado se realizó la evaluación textural y sensorial observándose que el reestructurado cárnico con características idóneas fue la base de carpa: cerdo, 75:25 con 8 % de harina de chía, con un color similar a un producto tipo integral. En la segunda etapa se obtuvo un biopolímero a base de suero de leche, inulina, grenetina, glicerol y extracto acuoso de (Hibiscus safdariffa L.) sustituyendo el contenido de agua (50 %), el cual presentó un contenido de compuestos fenólicos de 392.13 mgAGE/g. En la tercera etapa fue la aplicación biopolímero sobre el reestructurado y se evaluó el efecto durante su vida de anaquel, observándose que al transcurrir el tiempo de almacenamiento (23 días), el color no tuvo diferencia significativa, el recubrimiento con y sin extracto acuoso mantuvieron estable la humedad con respecto al control, quién tuvo una disminución significativa (p<0.05), en cuanto al contenido de bases volátiles totales, ambos polímeros (con y sin extracto acuoso de Jamaica) provocaron una disminución en la producción de estos compuestos, respecto a la textura, ambos recubrimientos tuvieron un efecto protector de los reestructurados, ya que las proteínas se vieron menos afectadas manteniendo por más tiempo la integridad del reestructurado cárnico. El perfil electroforético SDS-PAGE, mostró que las muestras con biopolímero coadyuvaron a mantener la integridad de la miosina durante el tiempo de almacenamiento, no siendo así para la muestra sin polímero. Respecto a los análisis microbiológicos, se observó que los reestructurados con biopolímero disminuyeron la velocidad de crecimiento de los microorganismos. Este estudio muestra que la aplicación de biopolímeros activos adicionados con extracto de Hibiscus safdariffa L., son una estrategia que retarda los cambios fisicoquímicos y microbiológicos de descomposición almacenados a bajas temperaturas (-4 °C).
福田, 将虎. "RNA-ペプチド複合体を用いた機能性分子の創製". 京都大学, 2007. http://hdl.handle.net/2433/68740.
Pełny tekst źródła0048
新制・課程博士
博士(エネルギー科学)
甲第13174号
エネ博第148号
新制||エネ||36(附属図書館)
UT51-2007-H447
京都大学大学院エネルギー科学研究科エネルギー基礎科学専攻
(主査)教授 森井 孝, 教授 木下 正弘, 教授 牧野 圭祐
学位規則第4条第1項該当
Vaillancourt, Joanie. "Étude du métabolisme de l'abiratérone et de ses métabolites biologiquement actifs". Master's thesis, Université Laval, 2020. http://hdl.handle.net/20.500.11794/68340.
Pełny tekst źródłaAbiraterone (Abi) is a selective steroidal inhibitor of androgens biosynthesis used for the treatment of advanced prostate cancer. Abi is known to be metabolised into pharmacologically active metabolites having either androgen synthesis inhibitor activity or antagonistic/agonistic activity toward the androgen receptor. Plasma concentration of these metabolites and androgen suppression are highly variable between treated patients. The activity of UGT enzymes toward these steroidal molecules is currently unknown. This pathway mediated by UGT enzymes is a key step in the metabolism of drugs and endogenous molecules. These enzymes have a primary role in the regulation of hormonal pathway targeted by Abi. We aimed to study the metabolism of Abi by the glucuronidation pathway, the genetic variability of UGT enzymes as well as the impact of this pathway on steroids inactivation. Data obtained point out UGT1A4 as the main enzyme implicated in the glucuronidation of Abi and its metabolites in the liver and they also show significant circulating levels of these new metabolites within treated patients. Moreover, many polymorphisms in this metabolic pathway lead to a loss of function of UGT1A4 and to the abrogation of the inactivation of Abi and its metabolites, suggesting that carriers of these polymorphisms might be exposed to higher concentrations of pharmacologically active metabolites. Finally, additional data revealed potent inhibitor activity of Abi and its metabolites toward androgens and adrenal precursor’s inactivation by UGTs expressed in liver and prostatic tissues. Our study shows that the relationship between the exposition to Abi and its metabolites, the androgenic suppression and the clinical response observed in treated patients is complex and suggest that genetic, pharmacologic and metabolomic analysis could allow the identification of new predictive biomarquers of the response toward the antihormonal therapy in patients treated with Abi.
Isabelle, Sébastien. "Exploiter la diversité génétique des cultivars de tomates pour mieux comprendre les voies métaboliques des composés volatils". Master's thesis, Université Laval, 2020. http://hdl.handle.net/20.500.11794/68540.
Pełny tekst źródłaTomato (Solanum lycopersicum) is widely appreciated by consumers. The distinctive flavor of tomatoes comes from the interactions between acids, sugars and a complex mixture of volatile compounds. These volatiles are mainly derived from nutrients such as carotenoids, fatty acids and amino acids. Although tomato is considered a model for fruit development, most of the metabolic pathways leading to volatiles synthesis are not yet fully understood. In order to better understand these metabolic pathways, we quantified about 100 volatile compounds in 254 accessions of heirloom, modern and wild tomatoes. We selected 64 tomatoes cultivars based on their aroma profile and performed a transcriptomic analysis. We used a linear regression model and a genome-wide association study to evaluate the relationship between volatile compounds and gene expression, in an effort to better understand the genetic regulation of the various metabolic pathways. The volatiles profile varied considerably among tomatoes cultivars. Volatile compounds within the same metabolic pathway were strongly correlated with each other. On the other hand, the strength of these correlations differed considerably, indicating the presence of limiting steps. Strong correlations between unrelated volatile compounds also indicate possible links between different biosynthetic pathways. The differential emission of several volatiles in the tomato cultivar population strongly correlates with the expression of characterized genes and other candidate genes. A genome-wide association study was used to target short chromosomal regions associated with the emission of certain groups of volatiles in the fruits. Our results demonstrate the potential of these different approaches to better understand the metabolic pathways leading to the biosynthesis of volatile compounds and to uncover new candidate genes.
Gengatharan, Archana. "La physiologie des cellules souches dans le cerveau adulte". Doctoral thesis, Université Laval, 2020. http://hdl.handle.net/20.500.11794/68740.
Pełny tekst źródłaNeural stem cells (NSCs) persist in the subventricular zone of adult brain and transit from the quiescent to the proliferative states to produce new neurons. The mechanisms regulating the transition froma quiescent to a proliferative state remain unclear. Since adult NSCs are enriched in genes associated with Ca2+ signalling pathways, we aimed to determine whether the transition from quiescence to aproliferative state is Ca2+ dependent. Here, we used miniature endoscopes (mini-endoscopes) to monitor NSC division and their regulation by Ca2+ signalling in freely behaving mice. Our data revealeddifferent Ca2+ dynamics and steady-state Ca2+ intracellular levels during NSC division. Pharmacological and in vivo CRISPR-Cas9 gene editing showed that IP3-sensitive intracellular stores and G-proteins regulators regulate the transition from quiescence to proliferation. We further used in vivo optogenetics to mimic Ca2+ dynamics of quiescence state to maintain NSCs in this state and prevent NSCsto transit into proliferative state. Our results demonstrate that Ca2+ dynamics and Ca2+ intracellularlevels play an important role in NSC activation. Next, we investigated NSCs microenvironmentmainly blood vessel and their role in their physiology. The NSCs contact the blood vessels by extending their basal processes. Direct cell-cell contact and the release of factors such as VEGF (vascularendothelial growth factor) by endothelial cells (EC) influence the NSC behaviour. As Notch pathwayis a key player in vasculature signalling, we inhibit in vivo the Notch signalling specifically in EC.We found that inhibition of Notch signalling in EC at early stage (P0) or later stage (P30) increasesNSC number. Morphological analysis of blood vessel reveals no alteration when Notch signalling isinhibited at later stages (P30). These finding showed that inhibition of Notch signalling in EC maintains NSC in quiescence state.
Traore, Ousmane Z. "Three essays on technical non-tariff measures in developed countries and African countries' international trade in agricultural products". Doctoral thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/68840.
Pełny tekst źródłaThe objective of this thesis is to analysis the economic implications of technical non-tariff measures (TNTMs) in force in developed countries on the international trade of agricultural and agri-food products of African countries. More specifically, we focus on three main issues. The first more general question is: what is and what determines the net effect of the set of TNTMs in OECD countries on African exports of plant products ? The second, more specific, question is: what are the effects of compliance with maximum residue limit (MRL) for pesticide on production, export supply and import demand ? Finally, the third question is to determine: what is the direct impact of product rejections at the border of European countries of the Rapid Alert System for Food and Feed (RASFF) on African exports of plant products ? We address these different questions through three essays. In the first essay, we theoretically analyze the net effect of technical non-tariff measures (TNTMs) on bilateral trade and suggest a robust empirical approach to evaluate this effect. We assess the impediment, enhancement and net effects of the TNTMs in force in OECD countries on African exports of plant products. Our theoretical findings highlight that the net effect of the TNTMs on aggregate bilateral trade depends not only on the elasticity of substitution and the elasticity of marginal cost with respect to the TNTMs but also the shape parameter of the distribution of marginal costs which depends on the technology. In addition, we find that for a given elasticity of substitution, only firms or countries characterized by a lower marginal cost than a cutoff marginal cost and higher productivity than a threshold productivity level will experience a positive net effect of trade to a given destination. For our empirical investigation, we estimate a sectoral gravity equation using the non-tariff measures (NTMs) database released by UNCTAD and WITS combined with cross-sectional trade data for 2017 from the UN COMTRADE/WITS database. The data cover 53 African countries exporting 40 Harmonized System (HS) 4-digit plant products to 35 OECD member countries. Our empirical results show both impediment (decrease of 3.099%) and enhancement (increase of 2.056%) effects of the TNTMs in force in OECD countries on African exports of plant products. Together, these effects yield a negative and significant net effect, which indicates that the TNTMs in force in OECD member countries are obstacles for African exporters of plant products. In the second essay, we disentangle theoretically and empirically the effects of the MRLs for pesticides on the production, export supply and import demand. We adopt a modelling approach based on the costs and benefits associated with food safety standards and use our theoretical framework to assess the empirical net effects of the MRLs for pesticides on African mango production and trade with OECD member countries. Theoretically, we show that the production effects of MRLs are negative while their net effects on bilateral trade can be positive, zero or negative depending on whether the consumers' perceived quality effect on import demand is greater than, equal to or less than the compliance cost effect on export supply through the unconditional expected standard-compliant production. We use a cross-sectional data set for 12 African countries that produced and exported MRL-compliant mangoes to 31 OECD countries in 2016, and find that, on the one hand, the net effects of MRLs on the production of safe mangoes are negative. On the other hand, they are positive on mango trade between African and OECD member countries. Our results highlight that the tightening or imposition of strict MRLs for pesticides in developed countries may be trade promoting while they severely impede production in African countries. In the last essay, we assess the effects of European countries' import refusals on African exports of edible vegetables and fruits from 2008 to 2018. We specifically estimate the average effects of the RASFF countries' border rejections on the extensive and intensive margins of African countries exports of edible vegetables and fruits. We use the border rejections data from the RASFF online database and export data on 45 African countries from the UN WITS database. We estimate the canonical version of the sectoral gravity equation of Anderson and al. (2004) using the Poisson pseudo maximum likelihood (PPML) estimator of Silva and al. (2006) in association with the robust twostage residual inclusion (2SRI) approach of Terza and al. (2008). We find that a single increase in the number of import refusals by a RASFF country in the current year leads to a decrease in the number of trade partners in Europe for African countries by 0.018 percent for edible vegetables and 0.143 percent for edible fruits. In addition, our results show that one additional import refusal decreases the export value of African countries' edible vegetables by 0.045 percent. However, we find that RASFF countries' refusal to import once in the current year leads to an increase in the export value of African countries' edible fruit by 0.126 percent. Furthermore, our results explicitly validate the hypothesis of the endogeneity of the number of import refusals and highlight both the direct and spillover effects of border rejections. The latter result means that an increase in the number of border rejections for a given product (for instance, a fresh fruit) in a given year leads to an increase in the number of border rejections for a product and its neighboring products (for instance, a fresh vegetable) in the next year.
Kaumbu, Jean Marc Kyalamakasa. "Sélection précoce des espèces forestières et potentiel mycorhizien arbusculaire en vue de la reforestation de la forêt claire dégradée du Haut-Katanga, en République Démocratique du Congo". Doctoral thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/68940.
Pełny tekst źródłaIn the Katanga province, Democratic Republic of the Congo (DR Congo), the anthropogenic pressure is exerted on the Miombo woodland (MW) with the expansion of the agricultural lands and the increased demand for charcoal, due to the demographic growth. The restorationof agricultural and forest fallows has become essential to reverse this decline and sustainably manage the degraded MW. The main objective of this thesis was to study the development of seedlings and the potential of arbuscular mycorrhizal fungi (AMF) in the MW of UpperKatanga, DRC. Its specific objectives were to: (i) assess the development and mycorrhizalstatus of MW species, with respect to their successional status (early (ES) or late (LS) tree species); (ii) determine the arbuscular mycorrhizal inoculum potential (AMIP) in degradedMW; and (iii) describe the diversity and community structure of AMF associated with amultipurpose forest tree (Pterocarpus tinctorius Welw also named Mninga maji in Swahili,Mukula in Bemba).First, the development of the seedlings was evaluated, for two pioneer tree species(Combretum collinum and P. tinctorius) and six late species (Brachystegia boehmii, B.longifolia, B. spiciformis, B. wangermeana, Julbernardia globiflora and J. paniculata), 1, 2and 4 years after planting. Then, the AMIP was estimated in degraded MW by baitingCrotalaria juncea seedlings. The relationship between AMIP and vegetation indix wase stablished with Generalized Linear Mixed Models (GLMM) and linear regressions. Finally, the diversity and the structure of the AMF community in the roots of P. tinctorius were characterized in the agricultural and forest fallow of three sites, by amplification, cloning of the 28S gene of the large subunit (LSU) of the ribosomal DNA and Sanger sequencing. The results showed that the early successional tree species, ES (Chipya) had early growthand were 3 to 40 times more productive than to LS (tree species characteristic of MW). ESspecies were colonized by AMF, whereas LS species were colonized by ectomycorrhizal fungi. In degraded MW, the density of some trees had a positive influence on AMIP,particularly woody legumes acting synergistically with the abundance of annual grasses.Woody legumes were more colonized and would act as AMF plant refuges. Molecular diversity of 30 operational taxonomic units (UTOs) of AMF was associated with P. tinctorius (one of the mycotrophic woody legumes), in the agricultural and forest fallows of three sites studied. The community richness and structure of the AMF were driven by the density ofwoody species colonized by AMF evenly distributed in plant species. The AMF communitywas dominated by species of the genera Rhizophagus and Sclerocystis, and were strongly associated with some chemical properties of the soil (pH, acidity, total aluminium and totaliron) and the density of some trees. Thus, the results highlight a variability of growth and biomass depending on the successional status (ecological groups). Also, the AMIP and the AMF communities were mainly driven by tree density and soil properties. We suggest there forestation of degraded MW with the native species (P. tinctorius, B. spiciformis and C.collinum) in mono-specific plantations or under agroforestry management with food crops.
Свищев, Д. А. "Термодинамический анализ и исследование механизма слоевой обращенной газификации биомассы : автореферат диссертации на соискание ученой степени кандидата технических наук : 01.04.14". Thesis, б. и, 2019. http://hdl.handle.net/10995/68440.
Pełny tekst źródłaLeón, Duarte Jaime Alfonso. "Metodología para la detección de requerimientos subjetivos en el diseño de producto". Doctoral thesis, Universitat Politècnica de Catalunya, 2005. http://hdl.handle.net/10803/6840.
Pełny tekst źródłaEn este sentido, es notoria la falta de mecanismos sólidos y confiables para traducir las necesidades del usuario en características de diseño; no únicamente aquellas palpables, se hace un particular énfasis en la necesidad de incorporar los atributos intangibles relacionados con la percepción del producto por el usuario. Las metodologías tradicionales de diseño, basadas en el análisis de la función no resultan eficaces para anticipar estos factores y generalmente la actividad creativa se fundamenta en características del producto autodefinidas, las cuales son refinadas mediante procesos cíclicos de diseño, lo cual trae consigo un cúmulo de problemas que se traducen en ciclos de desarrollo de producto demasiado prolongados, en los cuales no existen mecanismos para prever si una combinación de características del objeto corresponden a la necesidad del usuario en un entorno de uso real.
Esta genera una respuesta a la necesidad citada, mediante un mecanismo para la detección e interpretación de atributos de producto en la fase de diseño conceptual. De esta forma, no únicamente se identifican y categorizan las necesidades funcionales, sino que además se incluye un procedimiento para evaluar la percepción estética que el usuario posee hacia el objeto de diseño al examinar propuestas de diseño conceptual.
Partiendo de una diferenciación inicial del tipo de requerimientos, clasificándolos según su naturaleza objetiva y subjetiva, la propuesta metodológica recurre a mecanismos particulares para la detección, interpretación y categorización de las necesidades del usuario en estas dos vertientes básicas. Estas cualidades, una vez identificadas, son incorporadas en una estructura de affordances (Gibson, 1979) que muestra el conjunto de interacciones, en las cuales las propiedades del objeto son percibidas por el usuario como posibilidades de acción. El propósito de utilizar esta distribución es el servir de guía para el equipo creativo en la fase de diseño de detalle, fungiendo como marco referencial para el diseño de forma que la actividad creativa sea dirigida anticipándose aquellos aspectos que el usuario percibe como más importantes en un producto en su entorno de uso.
Para ello, se recurrió a una combinación de mecanismos adaptados para esta aplicación particular, siendo los principales de ellos el método Kano (1984), la técnica de diferenciales semánticos de Osgood (1957), el análisis factorial, así como a un sistema de inferencia que recurre a la lógica difusa o fuzzy logic (Zadeh, 1965).
El resultado de la investigación se circunscribe en el ámbito de los métodos de diseño, comprendidos estos según la definición de Christopher Jones (1981), quien señala que son conjuntos de directivas a seguir durante el proceso de creación de un producto que responda a una necesidad de mercado; esta perspectiva es complementada con la visión de Cross (1996), quien interpreta los métodos de diseño como cualquier procedimiento, soporte o herramienta para diseñar, de forma que se represente el conjunto de actividades a los que el diseñador puede recurrir y/o combinar en el proceso creativo.
Flowers, Antwoine. "Mass-spectrometry Based Proteomics of Age-related Changes in Murine Microglia". Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6840.
Pełny tekst źródłaWang, Baolai. "Some aspects of plateau permafrost, Qinghai-Xizang (Tibet) Plateau, China, and a comparison with the Mackenzie Delta region, Canada". Thesis, University of Ottawa (Canada), 1993. http://hdl.handle.net/10393/6840.
Pełny tekst źródłaDrummond, Emily Barbara McKenzie. "The consequences of genetic diversity for invasion success in populations of dandelions". Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/6840.
Pełny tekst źródłaTomiyama, Hiroyuki, Shin-ichiro Chikada, Shinya Honda i Hirouyuki Takada. "An RTOS-based approach to design and validation of embedded systems". IEEE, 2005. http://hdl.handle.net/2237/6840.
Pełny tekst źródłaSeraz, Md Syef. "Electrochemical analysis of antibacterial polyelectrolyte-coated magnesium alloys for cardiovascular applications". Thesis, Wichita State University, 2013. http://hdl.handle.net/10057/6840.
Pełny tekst źródłaThesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering
Ross, Jean C. "A history of poliomyelitis in New Zealand". Thesis, University of Canterbury. History, 1993. http://hdl.handle.net/10092/6840.
Pełny tekst źródłaNations, Julie. "Your Faith, My Fear : Countering Consent to Cosmic Positioning". Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/6840.
Pełny tekst źródłaAddressing American fear of discourse on faith, as indicated through evolving American faith narratives, is essential in effectively countering modern day terrorism and to sustaining and securing the republic founded upon unique and enduring democratic principles. This research explores American faith narratives and subsequent relevance to cosmic war, the consequences of American reactions and perceptions to religious extremism, and the prospect, parameters, and purpose of inclusive faith discourse in the public square. Reactions and realities explored herein are framed through (1) American history of faith in the public square; (2) theoretical world viewshow we know the enemy and know ourselves through Social Identity Theory and Positioning Theory, and (3) fear of unknown or uncomfortable concepts related to faith as evidenced through storylines inherent in American faith narratives. Influencing the global perception of America involves imagining the possibilities to ensure that future generations are afforded the American tradition of opportunity and freedom. This involves aggressively initiating public discourse on faith based upon securing diverse religious freedoms and beliefs and democratic principles in such a way that American faith narratives position the United States as a positive global and social influence, thereby impacting the global terrorists threat.
Gortz, Ann-Christin. "Linguistic markers as evidence for cultural awareness : a critical examination of international critiques of a South African dance company". Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6840.
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ENGLISH ABSTRACT: Viewing cross-cultural dance performances on international tours or as part of international dance festivals has become common practice all over the world. For critique writers, choreographers/ dancers and the audience the accessibility of such a diverse variety of dance has both advantages and disadvantages. Cross-cultural differences in these performances challenge strategies of viewing and perception which may lead to aesthetic enrichment but these performances also risk being misunderstood. In dance critique writing, such a misunderstanding may result in a negative critique projecting, in a worst scenario, negative prejudices on the respective cultures. This thesis investigates how attitudes towards, and perceptions of, cultural differences are reflected in cross-cultural dance critiques, through the use of particular linguistic and stylistic devices. Analysis strategies deriving from Critical Discourse Analysis and Text Analysis are used to uncover the critique’s strategies to communicate their evaluation including ways of persuasion and power. I analyse six critiques from three countries on the performance Beautiful Me performed on international tours by the Vuyani Dance Theatre from South Africa. My initial hypothesis is that cultural differences may lead to negative critiques due to intercultural misunderstanding. Since viewing Performance Art is not only influenced by the critique writer’s cultural background but also by their perception attitude towards the performance, the analysis takes perception modes such as a theatre semiotic approach and a phenomenological approach into consideration. Interestingly, different perception modes seem to have a greater impact on the outcome of a critique than cross-cultural differences. This means that most negative evaluations must have their origin in the applied strategy of viewing and perceiving dance. The critic seems to interpret and embed the perceived features of the dance performance into specific cultural or socio-political contexts forming an individual, often complex evaluation.
AFRIKAANSE OPSOMMING: Om te kyk na kruiskulturele dansuitvoerings deur dansgeselskappe op internasionale toere of as deel van internasionale dansfeeste, het wêreldwyd algemene praktyk geword. Vir kritici, choreograwe/dansers en die gehoor hou die toeganklikheid van so ’n diverse verskeidenheid dans sowel voordele as nadele in. Kruiskulturele verskille in hierdie vertonings daag kyk- en waarneem-strategieë uit, wat tot estetiese verryking mag lei. Daar is egter ook ’n moontlikheid dat hierdie vertonings verkeerd geïnterpreteer mag word. Só ’n waninterpretasie in dansresensies mag lei tot negatiewe kritiek wat, in uiterste gevalle, negatiewe vooroordele oor die betrokke kulture projekteer. Hierdie tesis doen ondersoek na die wyse waarop houdings teenoor en persepsies van kultuurverskille in kruiskulturele dansresensies deur middel van spesifieke talige en stilistiese middele gereflekteer word. Analitiese strategieë uit die velde Kritiese Diskoersanalise en Teksanalise word gebruik om kritici se strategieë wat ’n oordeel kommunikeer, bloot te lê. Ek analiseer ses resensies uit drie lande wat handel oor die vertoning Beautiful Me wat deur die Suid-Afrikaanse dansgeselskap Vuyani Dance Theatre tydens internasionale toere opgevoer is. My aanvanklike hipotese is dat kultuurverskille aanleiding mag gee tot negatiewe kritiek vanweë interkulturele misverstande. Aangesien die beoordeling van Uitvoerende Kunste nie slegs deur die kritikus se kulturele agtergrond beïnvloed word nie, maar ook deur hul waarnemingshouding teenoor die vertoning, neem die analise waarnemingsmodusse soos ’n teater-semiotiek-benadering en ’n fenomenologiese benadering in ag. Interessant genoeg, lyk dit asof verskillende waarnemingsmodusse ’n groter impak het op die uitkoms van kritiek as kruiskulturele verskille. Dít beteken dat die meeste negatiewe oordele hul oorsprong moet hê in die toegepaste strategie van dans kyk en waarneem. Dit blyk dat die kritikus die waargenome eienskappe van die dansuitvoering interpreteer en inbed in spesifieke kulturele of sosio-politiese kontekste wat aanleiding gee tot die verskillende, dikwels komplekse maniere van beoordeling.
Fekecs, André. "Élaboration de photoconducteurs d’InGaAsP par implantation d'ions de fer pour des applications en imagerie proche-infrarouge et spectroscopie térahertz". Thèse, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/6840.
Pełny tekst źródłaGonçalves, Vânia Raquel Bruno. "Prática de ensino supervisionada em educação Pré-Escolar". Master's thesis, Instituto Politécnico de Bragança, Escola Superior de Educação, 2011. http://hdl.handle.net/10198/6840.
Pełny tekst źródłaRomán, Olazabal Lilian, i Oroya Maite Norma Churata. "Desarrollo de un método cuantitativo por HPLC para la determinación de ácido fenilglioxílico y ácido mandélico, como indicadores biológicos de la exposición a estireno". Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2017. https://hdl.handle.net/20.500.12672/6840.
Pełny tekst źródłaTesis
Gomes, Nilvete Soares. "Escolha de vida religiosa consagrada, sexualidade e suas vicissitudes". Pontifícia Universidade Católica do Rio Grande do Sul, 2014. http://hdl.handle.net/10923/6840.
Pełny tekst źródłaThis Master thesis consists of two studies presented through articles formats. One article has a theoretical nature and the other refers to an empirical study. The overall objective of this study was to understand the sexuality process and its vicissitudes in consecrated religious life choice of young women. The theoretical paper presents a non systematic literature review discussing theoretical concepts about sexuality and its vicissitudes through consecrated religious life choice. The empirical article is an exploratory cross-sectional qualitative research, which aimed to investigate the sexuality process and its vicissitudes in religious life of young people who choose to follow the consecrated religious pathway and impasses that underlie this choice. Therefore, semi-structured interviews were carried out considering the topics: sexuality meaning for religious; experience of sexuality within the family - life story; being a woman-a woman in the consecrated religious life; experiences of caring relationships; impasses in sexual experience among religious; vocation - religious vocation; motivations for choosing and staying in the consecrated religious life.From the content of the reports it was found that the choice of sexuality in religious life is not for the young among the greatest challenges . However sexuality expressed in feelings and attitudes in fraternal relations of everyday life these young people the crossing underlies this phenomenon which reveals difficulties of sexuality lived in its broad sense. Conflicts are observed though their speech, therefore another signification in what refers to religious life and sexuality is also observed. Women interviewed pointed as a significant challenge that comes through religious life the difficulty in fraternal relations.
Esta dissertação é composta de dois estudos apresentados na forma de artigos. Um dos artigos é de caráter teórico e o outro é um artigo empírico. O objetivo geral do trabalho foi compreender o processo de sexualidade e suas vicissitudes na escolha de vida religiosa consagrada em mulheres jovens. O artigo teórico apresenta uma revisão assistemática da literatura que objetivou discutir, a partir de teóricos, acerca da sexualidade e suas vicissitudes no cenário da vida religiosa consagrada. O artigo empírico caracterizou-se como uma pesquisa qualitativa, transversal, exploratória cujo objetivo foi investigar o processo de sexualidade e suas vicissitudes na vida das jovens religiosas que fizeram a escolha pela vida religiosa consagrada e quais impasses subjazem a esta escolha. Para tanto, foram realizadas entrevistas semi-estruturadas, considerando os seguintes tópicos: significado da sexualidade para as religiosas; vivência da sexualidade no contexto familiar – história de vida; ser mulher- ser mulher na vida religiosa consagrada; experiências de relacionamentos afetivos; impasses na vivência da sexualidade entre as religiosas; vocação – vocação religiosa; motivações para escolha e permanência na vida religiosa consagrada.A partir do conteúdo dos relatos constatou-se que a sexualidade na escolha de vida religiosa não se constitui, para as jovens, entre os maiores desafios. Porém, a sexualidade expressa em sentimentos e atitudes nas relações fraternas do cotidiano dessas jovens, subjaz o atravessamento desse fenômeno que revela dificuldades da sexualidade vivida no seu sentido amplo. As falas demonstram conflitos, mas também ressignificação por parte destas jovens mulheres no que se refere à vida religiosa e à sexualidade. Entretanto, foi predominante nas falas das religiosas que um significativo desafio que circunscreve e atravessa a escolha de vida religiosa consagrada é a dificuldade das relações fraternas.
Spinelli, Priscilla Tesch. "A prudência na Ética Nicomaquéia de Aristóteles". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2005. http://hdl.handle.net/10183/6840.
Pełny tekst źródłaLavrenyuk, Helen Mykhalichko Borys. "Cu(II)–(polyamine) chelation as an efficient way of reducing combustibility of epoxy-amine composites modified by copper(II) inorganic salts". Thesis, V Міжнародна конференція "Весняні наукові читання", Частина 1, Київ 2020, С 61-64, 2020. http://hdl.handle.net/123456789/6840.
Pełny tekst źródłaMgweba, Sikho. "Student expectations of future life roles". Master's thesis, University of Cape Town, 2013. http://hdl.handle.net/11427/6840.
Pełny tekst źródłaHeller, Rainer. "The paleomagnetic field's long-term mean intensity and secular variation /". Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/6840.
Pełny tekst źródłaLacy, John S. MacGregor Cynthia J. "Preservice teacher beliefs about education from their experiences as K-12 students and members of an adolescent subculture". Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6840.
Pełny tekst źródłaAl-Wali, Azzam Ahmad. "Explicit alternating direction methods for problems in fluid dynamics". Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/6840.
Pełny tekst źródłaAaron, Sean Calvin. "Investigating Motivations for Using Dating Websites and Geosocial Apps". BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6840.
Pełny tekst źródłaDavis, Lance Garth. "Design of a helium-6 production target for the iThemba LABS Radioactive-ion Beam Facility". University of the Western Cape, 2018. http://hdl.handle.net/11394/6840.
Pełny tekst źródłaIt is well known, that there is a severe lack of information available pertaining to neutron rich nuclei, specifically of those nuclei with mass numbers ≥ 60. These neutron rich nuclei are not easy to access in current experimental facilities or be produced with sufficient yield to allow for it to be studied. In order to expand our understanding of nuclear physics by studying the properties and characteristics of these nuclei, the development of new facilities producing Radioactive-ion Beams (RIBs) is required. The applications for RIBs are wide, allowing for deeper investigations into the properties of nuclei, their interactions and the manner in which they were formed in the early universe. Additionally, there are various interdisciplinary fields such as medicine, biology and material science in which RIBs can be utilized as a driving mechanism for new research and technological innovation. The iThemba Laboratory for Accelerator Based Sciences (iThemba LABS), South Africa, has proposed a new facility for the production and acceleration of radioactive-ion beams (RIBs). The RIB Project is to be developed in sequential phases and would produce a range of neutron-rich isotopes for low-energy materials science and nuclear physics research. Of specific interest, is the production of the Helium-6 isotope (6He), for its potential applications in various areas of nuclear physics research. The aim of this research work was to design, model and optimise a RIB production target capable of producing high intensity 6He beams, guided by the characteristics of the primary proton beam available for use at iThemba LABS. This research work/design study is however limited, due to the absence of experimentally measured and verified 6He cross section data for proton induced reactions on the proposed target materials (Graphite and Boron Carbide). However, best-estimate approaches were adopted through the use of validated computer codes. Additionally, all 6He yield results are presented as in-target yields, as this study did not cover the diffusion (isotope release) efficiency of the target systems in question. Three RIB production targets types were investigated using Graphite, Boron Carbide and Beryllium Oxide as potential target materials. Following numerous optimisation processes, a Boron Carbide RIB target was converged upon, proving to be suitable for the production of high intensity 6He beams at iThemba LABS, by meeting the material thermal and mechanical limiting criteria for operation. This target system was found to produce an in-target 6He yield rate of 2 ~ 3 x 1011 6He/s, considered sufficient for experimental application at iThemba LABS.
James, Ima. "Strategies for Nursing Staff Working in a Correctional Facility". ScholarWorks, 2019. https://scholarworks.waldenu.edu/dissertations/6840.
Pełny tekst źródłaReber, Justin. "Putting the “pseudo” back in pseudopsychopathy: assessing psychopathic traits in individuals with focal brain lesions". Diss., University of Iowa, 2019. https://ir.uiowa.edu/etd/6840.
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