Tesis sobre el tema "Lean condition"
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MONCADA, QUINTERO CARMEN WILLIANA. "Ceramic open cell foams as catalytic support for endothermic and exothermic reactions: Focus on lean methane combustion". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2929756.
Texto completoPak, Sun. "Adaptation, combustion et limites pauvres d'un moteur à allumage commandé au gaz naturel obtenu par conversion d'un diesel faible puissance". Valenciennes, 1994. https://ged.uphf.fr/nuxeo/site/esupversions/1d663861-db36-4829-9d80-aa7826a05ebe.
Texto completoStarling, Neil Peter. "Condition assessment of lead based assets". Thesis, University of Surrey, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499398.
Texto completoAppelgren, Linn y Sofia Carlsson. "Paradox mellan Lean och motivation? : En medarbetarfokuserad undersökning om den upplevda motivationen i en kontext med Lean". Thesis, Linköpings universitet, Företagsekonomi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-108549.
Texto completoBackground In modern research, it is essential that companies consider employees’ motivation so that they benefit from the applied practices. A working method that has become increasingly common is the concept Lean, which has its origin in the Japanese automotive industry. Today, Lean has evolved into a universal concept that is applied in many industries worldwide. Although the concept involves numerous positive aspects it has endured strong criticism when it comes to the human aspects and researchers have raised the question if Lean is "Mean". Criticism is derived primarily to employees’ working conditions in terms of stress and lack, variation, autonomy, health and wellbeing. However, few empirical studies have been carried out that examines the impact that Lean has on employees’ experienced motivation. Aim The aim is to increase the understanding of employees’ experienced motivation in companies that practice Lean. Further on the study has the intention to investigate if there is a paradox between Lean and what motivates employees on work. Methodology The study has been conducted through a qualitative method by interviews and to be able to do a deeper examination and analyze how our phenomenon, motivation, is experienced in a Lean context we applied small-N-studies. Our strategy has been iterative, combining both a deductive and inductive approach, where the study has varied between theories and empirical observations until the final result. Conclusions We have identified that there is no paradox between Lean and motivation since the majority of employees’ experienced that they are motivated even though the company practice Lean. Nevertheless the study shows that there are both supportive and counteractive factors when it comes to the employees’ experienced working conditions. The counteractive factors consists foremost of high performance standards, goal steering and standardizations, and have in some cases a negative influence on the working conditions. Furthermore the experienced motivation is more positive overall when the companies use a softer form of Lean where all the members’ interests are taken into account.
Hartung, Georg. "Laser diagnostic investigations of flame turbulence interactions under lean-premixed conditions". Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612152.
Texto completoMartin, Scott Montgomery. "The conditional moment closure method for modeling lean premixed turbulent combustion /". Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/7088.
Texto completoOkon, Aniekan. "Combustion dynamics in a lean premixed combustor with swirl forcing and fuel conditions". Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/108265/.
Texto completoPagano, Vincenzo. "Analysis of a stratified pre-chamber spark ignition system under lean mixture conditions". Doctoral thesis, Universitat Politècnica de València, 2020. http://hdl.handle.net/10251/152486.
Texto completo[ES] En el presente trabajo se realiza la caracterización del proceso de combustión dentro de un sistema de encendido por pre-cámara bajo carga estratificada. Por lo tanto, se presenta una extensa revisión bibliográfica sobre los sistemas de pre-cámara desarrollados desde la segunda mitad del siglo XX hasta los tiempos modernos. El resumen muestra que los sistemas de última generación tienen el potencial de cumplir con los límites de las emisiones, al tiempo que proporcionan un alto rendimiento y un bajo consumo de combustible. No obstante, todavía se necesitan muchos esfuerzos de la comunidad científica para permitir la difusión a gran escala de la tecnología. De hecho, sobre la base de los desafíos abiertos observados, se desarrolla el plan de investigación incluyendo tanto una parte experimental como numérica. Todos los experimentos se realizan mediante la máquina de compresión-expansión rápida (RCEM) de que dispone el laboratorio CMT-Motores Térmicos . La disposición original de la culata se modificó para permitir el alojamiento de la propia pre-cámara, los inyectores , la bujía, los sensores de presión y un termopar. La metodología de ensayo implica la adquisición de la evolución de la presión tanto en cámara principal como en pre-cámara, el volumen del cilindro, la duración de la inyección auxiliar y el punto de ignición de la bujía. Estos se utilizan como parámetros de entrada para el modelo termodinámico cero-dimensional que devuelve los parámetros fundamentales que caracterizan ciclo de trabajo del sistema PCSI. Por lo tanto, se genera un conocimiento más profundo del proceso de intercambio de masas, del campo de turbulencias inducidas, de la tasa de liberación de calor, de la velocidad de combustión y del régimen de la llama. Posteriormente, para calibrar los coeficientes del modelo cero-dimensional bajo condiciones de arrastre, se llevaron a cabo varias simulaciones CFD en 3D mediante el software Converge. Por lo tanto, los resultados de las simulaciones en términos de masa intercambiada y energía cinética turbulenta de la precámara se han utilizado para calibrar el coeficiente de descarga de la tobera y los coeficientes del sub-modelo de turbulencia para todas las geometrías de la pre-cámara. Además, se analizan los resultados de las simulaciones CFD para comprender plenamente la estructura del campo de flujo y el efecto local inducido por las diferentes geometriás en el tiempo de activación de la chispa. La energía cinética turbulenta en términos de intensidad y orientación se investiga en varias secciones relevantes de la pre-cámara. Los resultados revelan una clara relación entre la turbulencia desarrollada dentro de la pre-cámara y la estructura de los orificios. Los orificios rectos o los chorros perpendiculares, promueven una turbulencia local más intensa debido a la colisión directa mientras que los orificios inclinados del campo fluido y del dosado. Precedentemente al desarrollo de la campaña experimental se evalúan varios aspectos fundamentales del sistema. La dispersión ciclo a ciclo se explora por medio de la evaluación estadística que muestra una baja desviación de los picos de presión. La presión y el punto de inyección auxiliar se optimizan para evitar los fenómenos de mojado de las paredes, asegurando al mismo tiempo una mezcla adecuada de aire/combustible. Finalmente, el punto de activación de la chispa se elige en función de la velocidad máxima teórica de la llama turbulenta. De este modo, la campaña experimental se lleva a cabo de acuerdo con la matriz de pruebas, con el fin de evaluar el efecto del dosado equivalente de ambas cámaras, y cómo el diámetro, el número y la distribución de los orificios afectan al proceso de combustión. Además, las pruebas de visualización de quimioluminiscencia, realizadas mediante el acceso óptico disponible de la RCEM, se combinan con resultados de CFD y resultados del modelo cerodimen para arrojar luz sobre el ciclo de trabajo. Las conclusiones sugieren que una mezcla ligeramente rica dentro de la pre-cámaracombinadaconelmayornúmerodeorificiosdesfasadoseslamejor configuración para garantizar un elevada eficiencia de la combustión en condiciones de mezcla pobre y ultra-pobre de la cámara principal. No obstante, los orificios axiales deben ser considerados para investigaciones futuras. Por último, el autor propone una serie de desarrollos considerados interesantes tanto en el campo experimental como en el numérico.
[CA] En el present treball es realitza la caracterització del procés de combustió dins d'un sistema d'encesa de pre-cambra soto càrrega estratifi-cada. Per tant, es presenta una extensa revisió bibliogràfica sobre els sistemes de precambra desenvolupats des de la segona meitat del segle XX fins als temps moderns. El resum mostra que els sistemes d'última generació tenen el potencial de complir amb els límits de les emissions, al mateix temps que proporcionen un alt rendiment i un baix consum de combustible. No obstant això, encara es necessiten molts esforços de la comunitat científica per a permetre la difusió a gran escala de la tecnologia. De fet, sobre la base dels desafiaments oberts observats, es desenvolupa el pla d'investigació incloent tant una part experimental com numèrica. Tots els experiments es realitzen mitjançant la màquina de compressió-expansió ràpida (RCEM) de què disposa el laboratori CMT-Motors Tèrmics. La disposició original de la culata es va modificar per a permetre l'allotjament de la pròpia pre-cambra, els injectors , la bugia, els sensors de pressió i un termoparell. La metodologia d'assaig implica l'adquisició de l'evolució de la pressió tant en cambra principal com en pre-cambra, el volum del cilindre, la duració de la injecció auxiliar i el punt d'ignició de l'espurna. Aquests s'utilitzen com a paràmetres d'entrada per al model termodinàic zero-dimensional que retorna els paràmetres fonamen-tals que caracteritzen cicle de treball del sistema PCSI. Per tant, es genera un coneixement més profund del procés d'intercanvi de masses, del camp de turbulències induïdes, de la taxa d'alliberament de calor, de la velocitat de combustió i del règim de la flama. Posteriorment, per a calibrar els coefi-cients del model zerodimensional sota condicions d'arrossegament, es van dur a terme diverses simulacions CFD en 3D mitjançant el programari Converge. Per tant, els resultats de les simulacions en termes de massa intercanviada i energia cinètica turbulenta de la pre-cambra s'han utilitzat per a calibrar el coeficient de descàrrega de la tovera i els coeficients del sub-model de turbulència per a totes les geometries de la pre-cambra. A més, s'analitzen els resultats de les simulacions CFD per a comprendre plenament l'estructura del camp de flux i l'efecte local induït per les diferents geometries en el temps d'activació de l'espurna. L'energia cinètica turbulenta en termes d'intensitat i orientació s'investiga en diverses seccions rellevants de la pre-cambra. Els resultats revelen una clara relació entre la turbulència desenvolupada dins de la pre-cambra i l'estructura dels orificis. Els orificis rectes o els dolls perpendiculars, promouen una turbulència local més intensa a causa de la col·lisió directa mentre que els orificis inclinats garanteixen una major homogeneïtat a causa de la generació d'un macro-remolì. A més, l'augment del nombre d'orificis mostra beneficis en l'homogeneïtat fluid-dinàmica. Llavors, abans de la campanya experimental s'avaluen diversos aspectes fonamentals del sistema. La dispersió cicle a cicle s'explora per mitjà de l'avaluació estadística que mostra una baixa desviació dels pics de pressió. La pressió i el punt d'injecció auxiliar s'optimitzen per a evitar els fenòmens de mullat de les parets, assegurant al mateix temps una mescla adequada d'aire/combustible. Finalment, el punt d'activació de l'espurna es tria en funció de la velocitat màxima teòrica de la flama turbulenta. D'aquesta manera, la campanya experimental es duu a terme d'acord amb la matriu de proves, amb la finalitat d'avaluar l'efecte del dosatge equivalent de totes dues cambres, i com el diàmetre, el numero i la distribució dels orificis afecten el procés de combustió. A més, les proves de visualització de quimioluminescència, realitzades mitjançant l’accés òptic disponible de la RCEM, es combinen amb resultats de CFD i resultats del model zero-dimensional per a llançar llum sobre el cicle de treball. Les conclusions suggereixen que una mescla lleugerament rica dins de la pre-cambra combinada amb el major nombre d’orificis desfasats és la millor configuració per a garantir un elevada eficiència de la combustió en condicions de mescla pobra i ultra-pobre de la cambra principal. No obstant això, els orificis axials han de ser considerats per a investigacions futures. Finalment, l’autor proposa una sèrie de desenvolupaments considerats interessants tant en el camp experimental com en el numèric.
Pagano, V. (2020). Analysis of a stratified pre-chamber spark ignition system under lean mixture conditions [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/152486
TESIS
Siddique, Abu Bakar [Verfasser]. "Leaf-inhabiting mycobiomes under different environmental conditions : local habitat conditions, leaf biochemistry and seasonal variations drive fungal community dynamics / Abu Bakar Siddique". Greifswald : Universitätsbibliothek Greifswald, 2017. http://d-nb.info/114094181X/34.
Texto completoColeman, Marc David. "Catalytic reduction of nitrogen monoxide using hydrogen at low temperatures under lean burn conditions". Thesis, University of Reading, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246453.
Texto completoZolkiewski, G. M. "Leak detection and condition monitoring of process valves by vibration analysis as a basis for condition based maintenance". Thesis, University of Manchester, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314626.
Texto completoAckerman, Jr Paul J. "Condition Assessment, Indices, and Risk-based Decision-making for Public School Infrastructure Managment". Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/50446.
Texto completoPh. D.
Long, Jessica B. "The behavioral functions of stimuli signaling transitions across rich and lean schedules of reinforcement". Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4444.
Texto completoTitle from document title page. Document formatted into pages; contains vi, 39 p. : ill. Includes abstract. Includes bibliographical references (p. 37-39).
Dibia, Chianu Harmony. "Lean manufacturing and employee working conditions in organisations operating in Nigeria : the managers' and supervisors' perspective". Thesis, University of Portsmouth, 2017. https://researchportal.port.ac.uk/portal/en/theses/lean-manufacturing-and-employee-working-conditions-in-organisations-operating-in-nigeria(04337b40-184a-49e8-a95c-090638ee5f4c).html.
Texto completoGuthrie, Victor Anthony. "Learning to Change, Changing to Learn: District Conditions for Organizational Learning". UNIVERSITY OF CALIFORNIA, SAN DIEGO, 2012. http://pqdtopen.proquest.com/#viewpdf?dispub=3488233.
Texto completoJohansson, Peter. "Plant Condition Measurement from Spectral Reflectance Data". Thesis, Linköping University, Computer Vision, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-59286.
Texto completoThe thesis presents an investigation of the potential of measuring plant condition from hyperspectral reflectance data. To do this, some linear methods for embedding the high dimensional hyperspectral data and to perform regression to a plant condition space have been compared. A preprocessing step that aims at normalized illumination intensity in the hyperspectral images has been conducted and some different methods for this purpose have also been compared.A large scale experiment has been conducted where tobacco plants have been grown and treated differently with respect to watering and nutrition. The treatment of the plants has served as ground truth for the plant condition. Four sets of plants have been grown one week apart and the plants have been measured at different ages up to the age of about five weeks. The thesis concludes that there is a relationship between plant treatment and their leaves' spectral reflectance, but the treatment has to be somewhat extreme for enabling a useful treatment approximation from the spectrum. CCA has been the proposed method for calculation of the hyperspectral basis that is used to embed the hyperspectral data to the plant condition (treatment) space. A preprocessing method that uses a weighted normalization of the spectrums for illumination intensity normalization is concluded to be the most powerful of the compared methods.
Damiano, Leonard Francis. "The effect of charge stratification on the combustion of lean methane-oxygen mixtures under constant volume. conditions". Thesis, University of Canterbury. Mechanical Engineering, 1993. http://hdl.handle.net/10092/6409.
Texto completoTuffrey, 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.
Texto completoApplied Science, Faculty of
Materials Engineering, Department of
Graduate
Thompson, James Patrick. "How and under what conditions clients learn in system dynamics consulting engagements". Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510858.
Texto completoAlao, Olakunle Oluwatosin. "Online condition monitoring of lithium-ion and lead acid batteries for renewable energy applications". Master's thesis, Faculty of Engineering and the Built Environment, 2018. http://hdl.handle.net/11427/30059.
Texto completoBalent, Zachariah (Zachariah Francis). "Improving lead time setting and on-time delivery commitments under uncertain supply conditions". Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119330.
Texto completoThesis: M.B.A., Massachusetts Institute of Technology, Sloan School of Management, in conjunction with the Leaders for Global Operations Program at MIT, 2018.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 55).
As Dell seeks to continually improve customer experience, the company is identifying new and innovative ways to improve on-time delivery. Inventory shortages that occur prior to production account for approximately 35% of missed delivery dates. When these part shortages occur, demand planners must apply "extended" lead times to these parts to ensure that Dell's customers have the correct expectation for when their order will be delivered. This project focuses on part shortage problems and how to generate accurate lead times for customers commitments. Previous research on the topic on lead time setting has focused predominately on buffering and measuring uncertainty in supply chains, which detail the benefits of having appropriate levels of safety stock and flexibility. However, prior research does not adequately describe methods for adjusting product lead times under uncertain supply conditions. The project develops a deterministic model for identifying when parts in Dell's supply chain require lead time adjustments due to supply shortages and then for setting the new lead times. Additionally, this project includes a statistical analysis of previous extended lead time events. After a five-week testing period, the deterministic model was quite accurate in identifying what parts require extended lead times. This offers a 3% improvement in identifying when extended lead times are needed as it decreases human error in missed and late lead time extensions. Predominant sources of error resulted from backlog management issues, part deviations in production, and miscellaneous data errors. The statistical analysis yields two insights into part recovery in Dell's supply chain: (1) larger volume shortages take shorter time to recover than small volume shortages, and (2) approximately 80% of all part shortages recover within 10 days. This research offers valuable insight into the problems associated with lead times in Dell's supply chain and recommends ways to best mitigate these errors. As Dell develops more robust and comprehensive databases on its inventory, future research can identify methods to accurately and automatically update lead times in real-time.
by Zachariah Balent.
S.M.
M.B.A.
ERCOLINO, GIULIANA. "Catalytic combustion of methane in lean conditions on Pd/Co3O4 : from powdered to open-cell foam supported catalysts". Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2675699.
Texto completoCarpenter, Christine M. "Speaker Preferences of Listening Behaviors that Lead to Perceived Listening : A Pre-condition of Perceived Understanding". PDXScholar, 1992. https://pdxscholar.library.pdx.edu/open_access_etds/4522.
Texto completoJernberg, Torgny. "Leaching of Lead and Other Heavy Metals from Brass Couplings under Different Hydrochemical Conditions". Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-50931.
Texto completoGrabow, Bethany. "Environmental conditions associated with stripe rust and leaf rust epidemics in Kansas winter wheat". Diss., Kansas State University, 2016. http://hdl.handle.net/2097/32835.
Texto completoDepartment of Plant Pathology
Erick D. DeWolf
Stripe rust (caused by Puccinia striiformis f. sp. tritici) and leaf rust (caused by Puccinia triticina) are the top two diseases of winter wheat (Triticum aestivum) with a 20-year average yield loss of 4.9% in Kansas. Due to the significant yield losses caused by these diseases, the overall objective of this research was to identify environmental variables that favor stripe and leaf rust epidemics. The first objective was to verify the environmental conditions that favor P. triticina infections in an outdoor field environment. Wheat was inoculated with P. triticina and exposed to ambient weather conditions for 16 hours. Number of hours with temperature between 5 to 25°C and relative humidity >87% were highly correlated and predicted leaf rust infections with 89% accuracy. The results of this outdoor assay were used to develop variables to evaluate the association of environment with regional leaf rust epidemics. Before regional disease models can be developed for a forecast system, suitable predictors need to be identified. Objectives two and three of this research were to identify environmental variables associated with leaf rust and stripe rust epidemics and to evaluate these predictors in models. Mean yield loss on susceptible varieties was estimated for nine Kansas crop reporting districts (CRD’s). Monthly environmental variables were evaluated for association with stripe rust epidemics (>1% yield loss), leaf rust epidemics (>1% yield loss), severe stripe rust epidemics (>14% yield loss) and severe leaf rust epidemics (>7% yield loss) at the CRD scale. Stripe rust and leaf rust epidemics were both strongly associated with soil moisture conditions; however, the timing differed between these diseases. Stripe rust epidemics were associated with soil moisture in fall and winter, and leaf rust epidemics during winter and spring. Severe stripe rust and leaf rust epidemics were associated with favorable temperature (7 to 12°C) and temperature (15 to 20°C) with relative humidity (>87%) or precipitation in May using tree-based methods of classification, respectively. The preliminary models developed in this research could be coupled with disease observations and varietal resistance information to advise growers about the need for foliar fungicides against these rusts in Kansas winter wheat.
Kurkcu, Esin Aytac. "Examination Of Lean Production With Regards To Occupational Health And Safety: A Case Study In An Automotive Plant". Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612810/index.pdf.
Texto completoand their job quality. This study investigates the increasing workload of the workers as a result of the unlimited performance demands of lean production as the first hypothesis. Secondly, there is the question of whether lean production provides a reduction in the number of occupational accidents because of the fact that occupational accidents are seen as waste, thus eliminated at all costs. The last hypothesis which will be assessed is that the number of occupational diseases increases after the implementation of lean production. To that end, a case study was carried out in an automotive plant by a qualitative research method using tools of observation, document analysis, in depth interview and structured interview. As a conclusion, the implementation of lean production in a plant in automotive industry has resulted in the reduction of the occupational accidents and improvement of ergonomic conditions even though the main incentive for these improvements is to reduce the wastes and costs and to increase the profitability and competitiveness. Based on the interviews, workers do not consider that their workload is increased after the implementation of lean production. Besides, workers feel work autonomy and job satisfaction. They also claim that they do not feel job stress in contrast to the literature.
Riabyi, S. I. "Comparative dynamics of changes of intestinal sutures' microbiota under the conditions of their leak development". Thesis, БДМУ, 2017. http://dspace.bsmu.edu.ua:8080/xmlui/handle/123456789/16916.
Texto completoSchüle, Lena-Louise [Verfasser]. "Functional analysis of the endocannabinoid system in conditional mouse mutants / Lena-Louise Schüle". Bonn : Universitäts- und Landesbibliothek Bonn, 2020. http://d-nb.info/1219140414/34.
Texto completoBuiguès, Jean-Marc. "Economie, societe et mentalites en vieille castille au dix-huitieme siecle : la ville de leon et sa juridiction". Montpellier 3, 1991. http://www.theses.fr/1991MON30010.
Texto completoThe purpose of this work is to approach eighteenth-century castilian economy, society and mentalities through the study of a particular case, the town of leon and its jurisdiction. The choice of these spatial limits allows a global approach of a town and of its countryside, which as a whole represent ninety villages and about fifteen thousand people. The first part deals with the geographical and institutional limits of the town and its jurisdiction. This is completed by an analysis of the structure and evolution of the population between fifteen-ninety and eighteen-twenty. The second part analyses the socio-professional structures of the town and of its countryside from the sixteenth until the eighteenth century. The economy of the town and of its countryside, the general structure of property, and urban landel property in the eighteenth century are studied in greater detail. The mentalities in the eighteenth century are analysed in a third part which is organized along two themes : the weight of religion which is revealed in wills and representations (pictures, sculptures, etc. ), and the penetration of the enlightenment in eighteenth-century old castile, this last aspect being based on a measure of literacy and on an analysis of leonese readers and readings
Zhang, Qingteng. "Properties of Ferroelectric Perovskite Structures under Non-equilibrium Conditions". Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4422.
Texto completoJuárez, Paz León Mauricio [Verfasser], Jutta [Akademischer Betreuer] Kretzberg y Jan A. [Akademischer Betreuer] Freund. "Retinal ensemble coding under dynamic conditions / León Mauricio Juárez Paz. Betreuer: Jutta Kretzberg ; Jan A. Freund". Oldenburg : BIS der Universität Oldenburg, 2012. http://d-nb.info/1050299396/34.
Texto completoRivers, Michelle Lauren. "Under What Conditions Do Students Learn From Experience About The Benefits Of Practice Testing For Learning?" Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent1625409046861153.
Texto completoFondom, Nicolas Yebit. "PHYSIOLOGICAL AND BIOCHEMICAL ADAPTATIONS IN SOME CAM SPECIES UNDER NATURAL CONDITIONS: THE IMPORTANCE OF LEAF ANATOMY". Oxford, Ohio : Miami University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1260552594.
Texto completoZhang, Yaofu. "Dezincification and Brass Lead Leaching in Premise Plumbing Systems: Effects of Alloy, Physical Conditions and Water Chemistry". Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/36280.
Texto completoAn in-depth literature review revealed that conventional wisdom about dezincification was no longer adequate in explaining failures observed in modern water systems. Little research has been conducted since the landmark work of Turner et al. nearly half a century ago. The potential role of chloramines, phosphate inhibitors, and modern understanding of water chemistry need evaluation. The role of physical factors including stirring, heating and galvanic connections are also potentially influential.
A mechanistic study of zinc solubility and corrosion of copper: zinc couples provided insight to factors that might mitigate and exacerbate zinc leaching from brass. Zinc solubility and corrosion was reduced by higher pH and bicarbonate, but was enhanced by higher chloride. Hardness ions including Mg+2 and Ca+2 had little effect.
Alloys with higher zinc content had a greater propensity for dezincification corrosion. Stirring and galvanic connections caused brass to leach more metals and have higher weight loss. Heating may contribute to corrosion scale accumulation.
A comprehensive examination of dezincification as a function of water chemistry used numerous techniques that include measurement of galvanic currents, metal leaching, and weight loss. In general, as would be predicted based on results of the study of solubility and corrosion of pure zinc, chloride emerged as an aggressive ion whereas bicarbonate was beneficial to brass corrosion. Hardness had little impact, and phosphates, silicates and Zn+2 inhibitors had a significant short-term benefit but little long-term benefit.
The relationship between dezincification corrosion, lead leaching from brass, and water chemistry was investigated in Chapter 5. Surprisingly, lead and zinc leaching from a range of brasses were found to be negatively correlated. Hence, use of brasses that minimize dezincification problems might increase lead leaching.
This thesis represents a comprehensive analysis of factors that are influential for dezincification and lead leaching from brass in premise water distribution systems through literature reviews, mechanistic investigations, bench-scale experiments, and case studies. Results can be used by water utilities, plumbing engineers, manufacturers and home owners to better prevent, recognize, and mitigate brass and dezincification corrosion problems.
Master of Science
Rasheed, Tajudeen Olusegun. "Safety Practices on Lead Poisoning Among Battery Technicians in Lagos Nigeria". ScholarWorks, 2017. https://scholarworks.waldenu.edu/dissertations/4018.
Texto completoEmadi, Majid. "Flame structure and thermo-acoustic coupling for the low swirl burner for elevated pressure and syngas conditions". Diss., University of Iowa, 2012. https://ir.uiowa.edu/etd/4968.
Texto completoWEINKAM, GRANT. "STEAM EXTRACTION OF POLYCYCLIC AROMATIC HYDROCARBONS AND LEAD FROM CONTAMINATED SEDIMENT USING SURFACTANT, SALT AND AKALINE CONDITIONS". University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1179071855.
Texto completoSanapala, Ravikumar. "Characterization of FR-4 printed circuit board laminates before and after exposure to lead-free soldering conditions". College Park, Md. : University of Maryland, 2008. http://hdl.handle.net/1903/8362.
Texto completoThesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Börnfelt, Per-Ola. "Förändringskompetens på industrigolvet : kontinuerligt förändringsarbete i gränslandet mellan lean production och socioteknisk arbetsorganisation /". Göteborg : Stockholm : Institutionen för arbetsvetenskap, Göteborgs universitet ; Arbetslivsinstitutet, 2006. http://ebib.arbetslivsinstitutet.se/ah/2006/ah2006_01.pdf.
Texto completoKassif-Weiss, Sivan O. "Do Shared S-minus Functions Among Stimuli Lead to Equivalence?" Thesis, University of North Texas, 2005. https://digital.library.unt.edu/ark:/67531/metadc4863/.
Texto completoCan, Mukaddes. "Hydrogen Generation From Conventional Fuels Over Mesoporous Mixed Oxide Catalysts Under Time Interrupted Reaction Conditions". Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12614520/index.pdf.
Texto completo850°
C under atmospheric pressure.According to the reaction test results, the 0.5%Rh-Co-SBA15 catalyst shows the highest methane conversion (82%) and H2 selectivity. The non-precious metal show lower reactivities, addition of Pb to the Co-SBA-15 catalyst increases the catalytic activity and decrease the H2 production temperature.
Ocello, Riccardo <1988>. "Characterizing the functional dynamics of the Leak Potassium channel h-TRAAK through Molecular Dynamics Simulations under physiological conditions". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amsdottorato.unibo.it/8853/1/Ocello-Riccardo_Tesi.pdf.
Texto completoMostert, J. P. F. "Generic energy storage controller for a power conditioner". Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/53744.
Texto completoENGLISH ABSTRACT: This thesis presents the design of a DSP based controller system for an auxiliary converter for generic energy storage connection to a line-interactive power compensator. The aim is to utilize a wide range of energy storage systems and incorporate them into the existing power compensator. This was done by adding a second converter to the system. The new controller was developed to control this converter and thereby the energy storage. A study was done on lead acid batteries, flow batteries and flywheels in order to gain a basic understanding of these systems and identify the requirements for their control. Based on these findings, a new DSP based controller and measuring system was developed. To test the new system a dc to dc converter was implemented for the control of lead acid and flow batteries. A dc to ac converter was also tested for the control of flywheel energy storage.
AFRIKAANSE OPSOMMING: Die tesis handeloor die ontwerp van'n DSP gebaseerde beheerstelsel vir 'n Iyninteraktiewe on-onderbreekbare kragbron met drywings-kompensasie met 'n hulp omsetter vir algemene enegiestoor koppeling. The doel is om 'n wye verskeindheid energie store in die huidige drywings elektroniese stelsel te inkorporeer. 'n Tweede omstetter is by die stelsel gevoeg om die energie stelsel te beheer. 'n Nuwe beheerder is ontwikkel om die omsetter te beheer en daardeur die energie stoor. Loodsuur batterye, vloei batterye en vliegwiele is ondersoek om 'n basiese begrip te vorm en te identifiseer wat nodig is vir die beheer van sulke energie store. Die nuwe DSP beheerder en meetstelsel is ontwikkel gebaseer op hierde ondervindings. Om die nuwe beheerstelsel te toets is 'n gs na gs omsetter geïmplementeer vir die beheer van loodsuur en floei batterye. Die omsetter is geherkonfigureer na 'n gs na ws opstelling en getoets. Die konfigurasie word gebruik vir die beheer van vliegwiele.
Kearns, Brian Vance. "Patterns and pathways of lead contamination in mottled ducks (Anas fulvigula) and their habitat". Diss., Kansas State University, 2015. http://hdl.handle.net/2097/19062.
Texto completoDepartment of Biology
David A. Haukos
Mottled ducks (Anas fulvigula) are dabbling waterfowl species native to coastal wetlands of the Gulf of Mexico of the United States and Mexico. Although closely related to common waterfowl species such as the mallard (A. platyrhynchos) and American black duck (A. rubripes), the mottled duck exhibits unique behavior, mainly in its life history as a non-migratory species. As such, because of population declines caused by predation, habitat destruction, and environmental contaminants, this species requires specialized conservation concerns and species-specific management to protect population numbers. The goal of this study was to assess ongoing effect of observed lead (Pb) contamination and exposure issues in mottled ducks and their habitats, which I achieved by conducting assessments that will provide managers habitat and organism level metrics to detect and mitigate lead in mottled ducks and their environments. My field study was conducted at the Texas Chenier Plain National Wildlife Refuge Complex (TCPC), which was the area of greatest mottled duck density on the Texas Coast. I first created a body condition index to provide managers a tool to monitor population health, and a proxy for lead exposure and avian health without destructively sampling individuals. I then used presence-only maximum entropy (MaxENT) and multivariate statistical modeling procedures in conjunction with mottled duck movement data to elucidate sets of habitat conditions that were conducive to predicting the occurrence of mottled ducks and environmental lead “hot spots”. MaxENT analyses suggested that lead in the top portion of the soil column is similarly related to all environmental variables considered, may be increasingly available after large-scale environmental disturbances. Lack of variation in coarse-scale habitat use between breeding and non-breeding seasons may further point to a food-based exposure pathway for lead as mottled ducks switch from an invertebrate to plant diet, either as a result of changing age classes or normal adult phenology, during the period of increased lead exposure. Using stable isotope ratio analysis, I then tested environmental samples of soil and vegetation as well as mottled duck blood to determine isotopic signatures that were consistent with particular sources of lead deposition (e.g., lead shot pellets, leaded fossil fuel combustion, industrial effluents). Comparisons suggested a great deal of similarity to lead shot reference values in vegetation and blood samples, especially in blood samples with higher concentrations of lead present. Last, I conducted a formal Ecological Risk Assessment (ERA) procedure to quantify the risk to mottled ducks from lead exposure in their current habitat and direct managers towards effective mitigation and habitat management strategies to reduce exposure in the future. One scenario suggested that mottled ducks were at greatest risk from eating an invertebrate-based diet, but lead content values at the TCPC suggest that a plant-based diet may provide a higher lead exposure risk for mottled ducks, depending on true levels of bioavailability in environmental media. Overall, I determined that mottled ducks experience greatest lead exposure risk from lead shot pellets on the TCPC or in nearby habitat, while potentially also experiencing low levels of exposure from several other sources. Additionally, management efforts that focus on plants that do not provide food resources for mottled ducks as a potential environmental sink for lead contamination, such as phytoremediation, may prove effective in reducing the overall lead load from historical activities that likely deposited much of the lead in this ecosystem.
Bukhari, Sarfaraz. "Evaluation of the effects of processing conditions on shear strength in Pb-free surface mount assembly". Diss., Online access via UMI:, 2004. http://wwwlib.umi.com/dissertations/fullcit/1422361.
Texto completoBerglund, Viktor. "Improving the packaging of Crosslaminated timber : A master thesis that examines the environment and methods at Martinsons Såg, Bygdsiljum". Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-68580.
Texto completoPetrynych, V. V. "The influence of the rate of acetylation on the state of the behavioral responses of rats in conditions of lead intoxication". Thesis, БДМУ, 2022. http://dspace.bsmu.edu.ua:8080/xmlui/handle/123456789/19827.
Texto completoDavis, Marjorie Lynn. "Survival of Escherichia coli O157:H7 on cut and whole surfaces of spinach and leaf lettuce, packaged under modified atmospheric conditions". Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/34925.
Texto completoMaster of Science in Life Sciences
Dang, Le Anh Tuan. "Ontogenetic variations in leaf traits of the homoblastic species Dipterocarpus alatus under two light conditions at Cat Tien national park, Vietnam". Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20236/document.
Texto completoBackground and Aims:Attempts to explain variations in leaf parameters based solely on environmental factors, this will lead to significant errors if the plant shows substantial ontogenetic variations in leaf properties. We evaluated variations in 27 morpho-anatomical leaf traits of Dipterocarpus alatus over six architectural development stages and between axes at a given development stage under two different light conditions. Methods:An architectural analysis was conducted to distinguish precisely and objectively axis categories and developmental stages of Dipterocarpus alatus. Leaves were collected on the most recent complete growth unit on the top of the trunk and the outermost part of the middle-crown branch with branchlet and twig from trees growing under two different light conditions. Twenty two leaf traits were measured and calculated using ImageJ on images of leaf tracings and cross-sections. Stomatal density was calculated on nail varnish impression of the leaf lower surface. Four chlorophyll traits were determined. One-way ANOVA and Tukey post-hoc tests were used to determine differences between development stages and axes. The lmg relative contribution was calculated with R package relaimpo and compared with bootstrap analysis to determine ontogenetic stage, axis category or light intensity, which explained more the variations in leaf anatomy.Key results:Leaf morphology and anatomy differed strongly during ontogeny for all four axes in term of order and category under both light conditions. The axis effect was displayed at stages B, C, D and F but tend to be insignificant at stage E. Tree ontogeny explained more variations in leaf morphology and anatomy than light intensity. Axis category explained more variations in leaf morphology but not in leaf anatomy than tree ontogeny. Conclusions: Strong and significant intraspecific variations (during ontogeny and between axes) may influence the interspecific variations, and thus challenge the validity of the mean value of leaf traits between species. Tree ontogeny contributed more than light intensity in explanation of the variability in leaf morphology and anatomy both on the trunk and second axis order strongly recommends that studies on the responses of leaf anatomy to the environment need to correct for the ontogeny effect
Ribeiro, Maria da SaÃde de Sousa. "Ecophysiology and alecrim pimenta productivity at conditions of Massif BaturitÃ, CearÃ". Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=14350.
Texto completoDentre os vegetais que compÃem ampla diversidade do MaciÃo de Baturità se inserem as plantas medicinais, sendo estas, principais componentes da medicina tradicional. No entanto, informaÃÃes cientÃficas que possam contribuir para o incremento do cultivo dessas plantas ainda sÃo raras, particularmente nas condiÃÃes edafoclimÃticas do Estado do CearÃ. Objetivou-se com o presente trabalho, avaliar o desenvolvimento e o potencial produtivo do alecrim pimenta (Lippia origanoides) nas condiÃÃes edafoclimÃticas do MaciÃo de BaturitÃ, CearÃ. Foram realizados dois experimentos, sendo o primeiro durante o perÃodo seco de 2013 (agosto a novembro) e o segundo durante o perÃodo chuvoso de 2014 (fevereiro a maio). O experimento foi conduzido seguindo um delineamento inteiramente casualizados com parcelas subsubdivididas, sendo as parcelas definidas pelas duas estaÃÃes (seca e chuvosa), as subparcelas formadas pelas condiÃÃes de luminosidade (telado e pleno sol), e as subsubparcelas pelas quatro Ãpocas de avaliaÃÃo (0, 40, 80 e 120 dias apÃs o transplantio). Foram utilizadas cinco repetiÃÃes, sendo cada repetiÃÃo representada por um vaso de 20 litros contendo uma planta. Foram avaliadas as seguintes variÃveis: Ãrea foliar, altura da planta, diÃmetro do caule, massa seca dos diferentes ÃrgÃos vegetais, trocas gasosas, teores de clorofila, teores de minerais, solutos orgÃnicos e rendimento do Ãleo essencial. O alecrim pimenta desenvolveu-se bem na regiÃo do MaciÃo de BaturitÃ, com produtividades de biomassa e de Ãleo essencial similares Ãs observadas em outros estudos. O cultivo em telado alterou o padrÃo de desenvolvimento do alecrim pimenta, resultando em plantas com melhor aparÃncia geral, mais altas, com folhas maiores, maior Ãrea foliar especÃfica, menor desenvolvimento do sistema radicular e menor relaÃÃo raiz/parte aÃrea, independentemente da Ãpoca de cultivo. A produÃÃo de massa seca de folhas e total nÃo diferiu entre os dois ambientes apÃs 120 dias de cultivo, independentemente do perÃodo do ano. Houve forte influÃncia do ambiente de cultivo no perÃodo seco, sobre a condutÃncia estomÃtica e a transpiraÃÃo, com os valores sendo menores no ambiente a pleno sol, sugerindo a sensibilidade estomÃtica da espÃcie Ãs condiÃÃes atmosfÃricas do perÃodo. As plantas cultivadas em telado apresentaram, de forma geral, maiores teores de nutrientes minerais e de compostos nitrogenados (N-aminossolÃveis), em comparaÃÃo Ãs plantas submetidas a pleno sol, independente do Ãpoca de cultivo.