Dissertations / Theses on the topic 'Pond construction'
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Almhagen, Jimmy. "Anuran colonization of newly constructed ponds : The importance of time and distance to source populations." Thesis, Halmstad University, School of Business and Engineering (SET), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-960.
Full textDispersal is an important factor in animal ecology. Anurans (frogs and toads) are often philopatric (home loving) but some specimens in a population usually have the capacity to disperse relatively long distances. In this study I investigated the colonization of newly constructed ponds in the southwest of Sweden by three anuran species: The common toad (Bufo bufo), the moor frog (Rana arvalis) and the common frog (Rana temporaria). The ponds were constructed between two and five years ago and were now as frequently occupied as older source ponds in the area. For the common toad and the common frog there was no correlation between distance to source populations and degree of colonization. The moor frog was more common in ponds that were situated in the vicinity of older source ponds with ample populations. The main impression was that these species rapidly colonize newly constructed ponds, at least within moderate distances from source populations. There were some differences between the species though and it seems like the moor frog have more limited dispersal abilities than the other two species.
Clement, Jessica. "Environmentally concious [sic] site design : a LAND code strategy." Virtual Press, 2008. http://liblink.bsu.edu/uhtbin/catkey/1397793.
Full textDepartment of Landscape Architecture
Alcaraz, Segura Aurora. "Enhancing the thermal efficiency of a salinity gradient solar pond. Implementation of the study in the design, construction, salinity gradient establishment, operation and energy transfer at industrial scale." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/666185.
Full textEl modelo energético en las últimas décadas ha estado dominado por el consumo de combustibles fósiles, asumiendo un alto coste ambiental. El calentamiento global y la destrucción de la capa de ozono son dos ejemplos del deterioro que se está sufriendo debido al uso de estas fuentes de energía. Cada vez más, el uso de energías renovables es una de las alternativas en la construcción de un modelo económico sostenible. Entre las energías renovables, la energía solar se presenta como una fuente de energía inagotable y accesible. El estanque solar es una tecnología que cumple todos los requisitos para ser considerado un dispositivo de almacenamiento de energía. Puede almacenar energía solar, cargando durante los meses de alta incidencia solar (primavera-verano), almacenando la energía y haciendo posible su uso cuando es necesaria. Un estanque solar con gradiente salino es un cuerpo de agua salina con capacidad de almacenamiento térmico a largo plazo. El objetivo y alcance de esta tesis doctoral se divide en dos partes. Primero, la mejora de la eficiencia del estanque solar a través de la evaluación experimental de los procesos de extracción de calor y aportación de calor en diferentes condiciones climáticas. Estos experimentos se llevaron a cabo en un estanque solar a escala planta piloto de 50 m2 situada en Martorell (Cataluña). Los experimentos de extracción de calor se realizaron mediante el uso de intercambiadores de calor situados en el área lateral y en el área inferior del estanque. El proceso de extracción de calor se llevó a cabo de manera individual (área lateral o inferior) o simultáneamente (área global). Los resultados demostraron que la eficiencia del estanque aumenta cuando el calor es extraído usando el intercambiador de calor lateral en comparación con el uso del intercambiador de calor inferior o con los dos intercambiadores de calor simultáneamente. Por otro lado, el uso de placas solares como fuente externa de energía se llevó a cabo junto con el proceso de extracción de calor en dos condiciones climatológicas diferentes: invierno y verano. Los resultados obtenidos indicaron que el uso de placas solares permitió un aumento del 50% en la eficiencia diaria durante los experimentos llevados a cabo durante la estación fría. La segunda parte se centró en el diseño, construcción y operación de un estanque solar de 500 m2 en las instalaciones de Solvay Minerales (Granada). El estanque solar fue diseñado para suministrar el calor necesario para precalentar el agua (> 60 ° C) y los reactivos en la unidad de flotación de la instalación de procesamiento de minerales. Las eficiencias globales obtenidas después del primer y segundo período de operación son 9.7 y 12.3%, respectivamente, con valores máximos de 28 y 24% obtenidos durante los primeros meses de operación. En cuanto al ahorro económico, se obtuvieron reducciones de 52 y 68% en el primer y segundo período en comparación con el sistema tradicional sin estanque solar. Además, el impacto ambiental se reduce claramente considerando la reducción de las emisiones de CO2. La experiencia del estanque solar de Granada demuestra que la principal ventaja de estos sistemas es la capacidad de almacenar energía en los meses con mayor radiación solar, para poder proporcionar un flujo de calor a un sistema externo durante todo el año, incluso en condiciones climáticas adversas, como se pudo comprobar durante la nevada en enero de 2015.
Wang, Wei. "Saint-Gobain et Pont-à-Mousson face à la construction européenne 1946-1970." Thesis, Paris 4, 2016. http://www.theses.fr/2016PA040083.
Full textFounded in 1685, Company of Saint-Gobain is now a very large global firm, which is due to its own development, but also to its merger with Pont-à-Mousson. In the early twentieth century, the Companies were already the leading French multinational. It sought early internationalization, especially to Europe, establishing itself in Germany and Italy. After World War II, Pont-à-Mousson took part in the creation of the European Coal and Steel Community (ECSC). The latter is considered as the first institution leading to European unity, especially in an economic Europe. For both companies, each defined as an autonomous centre of decision, it is this book that aims to study the inside process of economic decision-making and to analyse the external environment during the 1945-1970 in the context of European integration. Why Pont-à-Mousson has involved with such an interest in the creation of the ECSC? Which role did the groups of Saint-Gobain and Pont-à-Mousson play in the opening of the common market? What were the policy and objectives of the political leaders? One of the interests of this book is to try to define the evolution of strategies, from a defensive attitude to an offensive attitude, the two companies adapt to Europe and thus accepting the gradual transformation in their Management model. This is mostly the European constraint that has pushed them closer, rather than under the only pressure pushed by an interventionist French state: strategies of the Company itself played a decisive role
Burgelin, Jean-Baptiste. "Nouveau concept modulaire de tablier de pont tout aluminium à portée simple et assemblable en chantier." Master's thesis, Université Laval, 2017. http://hdl.handle.net/20.500.11794/27911.
Full textThis thesis studies the possibility of designing a full aluminum deck which would be economically interesting in order to compete with the use of concrete slab and wood for bridge decks. The requirements for this project are that the new concept has a span of 15 meters, can be built in a factory and can be assembled in the field. This thesis is part of the Quebec aluminum development strategy (SQDA 2015-2025) and is done in partnership with the ministry of Transportation, of durable Mobility and of transport Electrification (MTMDET). Having rejected the possibility of a 15 meters long aluminum deck without any clamp system between panels and entirely made in Quebec, an innovating concept has been proposed using only extrusion with a circumscribed diameter lower than 460 mm (18 inches). Seeking to validate the new concept with the CAN/CSA S6-2014 code and by the finite element method, it has been realized that chapter 17 of this code, related to aluminum structures, is very conservative and sometimes incomplete. Consequently, new methods have been proposed to have access to truck load fractions or to effective length of an aluminum deck. An economic analysis has been made after having studied the technical considerations. It focused on production costs of an aluminum deck and a comparison with the production cost of a concrete slab or a wooden deck. Finally, considering the results, a final conception has been proposed which qualifies for the code and is economically viable.
Babicová, Ivana. "Horská chata pod Poľanou." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-371875.
Full textMaget, Jean-Pierre. "Lecture de la maquette du Pont de l’Europe (1989) de Gaetano PESCE." Thesis, Strasbourg, 2018. https://publication-theses.unistra.fr/restreint/theses_doctorat/2018/MAGET_Jean-Pierre_2018_ED520.pdf.
Full textIn September 1989 the City of Strasbourg exhibited at the "Salon des Utopies" in the Grand Palais in Paris a model of a "Bridge for Europe" designed by Gaetano Pesce, architect, designer and philosopher. This bridge in the form of an "S", representing the initial of Strasbourg, was designed to cross the Rhine upstream of the city to link France in the West with Germany in the East. In 1989 the European Economic was composed of only twelve states each of which was represented on Gaetano Pesce's model twice: first by a national pavilion situated on the bridge; second by a schematic map of a Europe of the Twelve shown on the floor of the bridge, N/S. The extension of the European Union, among other reasons, rendered the execution of this project out of date. Since December 2013 this model has been exhibited in the section dedicated to Europe in Strasbourg's History Museum
Alsaleh, Hassan. "Modélisation non-linéaire en trois dimensions de l'interaction sol-micropieux-pont sous chargements sismiques." Lille 1, 2007. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2007/50376-2007-Alsaleh.pdf.
Full textBeudon, Camille. "Conception et analyse de cycle de vie d'un pont routier à platelage en aluminium sur poutres en bois lamellé-collé." Master's thesis, Université Laval, 2020. http://hdl.handle.net/20.500.11794/67779.
Full textThe Quebec Gouvernment wishes to promote the use of wood and aluminium in the construction and rehabilitation of structures. In the context of the short-term vision of construction projects, wood and aluminium are clearly disadvantaged. However, aluminium and glued laminated timber could become competitive materials for the rehabilitation of the Quebec roadway bridges, in particular thanks to their local production in Quebec and their possibility of recycling. In order to avoid a biased short-term view, the method of arbitration used is that of life cycle analysis. This holistic method makes it possible to take into account all life-cycle stages. Two analyzes are carried out in parallel. The first concerns life cycle costs and the second concerns environmental impacts. These two studies complement each other and add a environmental dimension, which is not negligible today, on decision-making. The first stage of this project consists of the design of the hybrid bridge deck aluminium on glued laminated timber beams using the CAN / CSA S6-14 standard. The bridge-type thus designed is subsequently used during life cycle analyzes. The economic analysis is done using the ISO 15686-5 standard (2017). The environmental impact analysis is done using the ISO 14040 and 14044 standards (2006). The use of wood and aluminium as well as the low number of maintenance operations make the aluminum/wood deck more economically advantageous over its entire lifespan. Conventional concrete/steel decks provide a clear reduction in initial construction costs, but this trend is reversed very quickly. The possible prefabrication of aluminium/steel and aluminium/ wood bridge decks reduces indirect construction costs. Thus aluminium/ wood bridge decks reduce 86 % of the total cost of the conventional bridge deck. In terms of environmental indicators, the aluminium wood/decki s also to be favored
Raphael, Wassim. "Étude fiabiliste du fluage des structures en béton armé et précontraint." Châtenay-Malabry, Ecole centrale de Paris, 2002. http://www.theses.fr/2002ECAP0878.
Full textNovosad, Jiří. "Polyfunkční dům Bystřice pod Hostýnem." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265543.
Full textPlamondon, Millie. "Étude de l'influence de l'endommagement sur la fiabilité d'un pont existant en béton armé." Thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25898/25898.pdf.
Full textJohansson, Josefine, and Wohlfart Lisa Zöllner. "Sustainable bathroom design." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-216381.
Full textSkanska är ett av de ledande byggföretagen inom hållbarhet i Sverige. Byggnader står för 40 % av både den globala energianvändningen och de globala resurserna. På grund av dagens rådande bostadsbrist behöver byggtakten öka och samtidigt bli hållbarare. Industrialiseringen inom byggsektorn är jämfört med andra branscher låg, men prefabricerade komponenter såsom väggar och bjälklag används i stor utsträckning. Under det senaste decenniet har även prefabricerade badrumsmoduler blivit allt vanligare i kommersiella projekt. En modul är ett komplett badrum, tillverkat i fabrik, som enbart lyfts på plats och kopplas in. Syftet med arbetet är att utvärdera modulkonceptet ur ett hållbarhetsperspektiv och att jämföra det med ett traditionellt platsbyggt badrum. Data har samlats in genom studiebesök, intervjuer, enkät, referensprojekt och bakgrundsstudier. Analysen baseras på sju nyckeltal, design, personalresurser, spill och förluster, tid, transport, ekonomi samt energi. Användning av moduler resulterar i en förbättring i fyra av sju nyckeltal, personalresurser, spill och förluster, tid och ekonomi. Största fördelen är den förkortade produktionstiden, vilket i sin tur leder till minskade kostnader. För referensprojektet blev kostnadsbesparingarna 6,6 % av den totala projektkostnaden. Vanligtvis är livscykelkostnader i dagsläget inte inräknade i de initiala kalkylerna, vilket ger en missvisande projektkostnad. Moduler är lämpade för projekt med minst 25-30 badrum, där slutanvändaren inte påverkar design och där det är minst 20 badrum per modell.
Ferland, Diane. "Être un pont de paix: affirmation d'une identité samaritaine multiséculaire et re-construction d'une frontière identitaire dans le contexte actuel du Proche-Orient." Mémoire, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/6816.
Full textSerre, Gilles. "Construction de modèles réduits numériques pour les écoulements compressibles linéarisés." Phd thesis, Ecole Centrale de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00946632.
Full textMorozova, Tatiana. "Modernisation urbaine et transfert de technologies en Europe au XIXe siècle : la construction du Pont Troitski à Saint-Pétersbourg par la Société de construction des Batignolles à la fin du XIXe-début du XXe siècle." Paris 1, 2013. http://www.theses.fr/2013PA010528.
Full textJůnová, Lucie. "Novostavba technického zázemí DIAMO ve Stráži pod Ralskem - příprava realizace stavby." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240022.
Full textGilbert, Matthew. "Fir-Flower Petals on a Wet Black Bough: Constructing New Poetry through Asian Aesthetics in Early Modernist Poets." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etd/3588.
Full textGraf, Kathrin. "La médiation : une approche constructive à la hauteur des conflits de notre temps : un pont possible entre la justice et la paix dans un monde pluraliste." Thesis, Paris 2, 2017. http://www.theses.fr/2017PA020052/document.
Full textThis work aims to provide a multidisciplinary approach - historical, socio-political, economic, and psychological - to understand the general interest of constructive conflict management, and in particular the opportunities related to the method of mediation. The thesis reflects the path taken - from deconstruction to reconstruction of the subject - beginning with a theoretical analysis (origins, specificities, differences with other methods, values and principles) and considering the individual and collective phenomena inherent to each conflict and its management (levels of conflict, management dimensions, individual psychological foundations, opportunities of integrative bargaining, but also the limits and risks associated with the method of mediation). The present work also takes into account the personal evolution of the researcher, her practice as a mediator, exchanges with other professionals on this behalf and her personal findings of feasibility (practical advice, logistical organization, concrete tools for the various phases, and the restitution of the key steps of a practical case). Key words : active listening, alternative dispute resolution, arbitrary, communication facilitation, conciliation, confidentiality, consensus, constructive and effective conflict management, creative problem-solving, decision science, dialogue, empathy training, empowerment, Harvard negotiation model, impartiality, integrative bargaining, looping, mediative solutions, moderation, negotiation, “pareto optimal” solutions, peacemaking, process management, reconciliation, reframing, settlements, supervision, therapy, understanding, zone of possible agreements
Pujol, Pujol Romà. "Una reconsideració dels nombres enters per a l'ensenyament postobligatori. Pont didàctic entre la presentació empírica de la matemàtica escolar i el mètode constructiu de l'ensenyament superior." Doctoral thesis, Universitat Autònoma de Barcelona, 2008. http://hdl.handle.net/10803/4718.
Full textLa proposta d'ensenyament que implementem neix de la resolució del problema dels nombres consecutius. A partir d'un treball experimental arribem a una introducció híbrida del nombre enter que connecta l'ensenyament deductiu amb el constructiu. Establim un pont didàctic entre el tractament empíric i intuïtiu del nombre enter, que caracteritza una primera introducció a l'ensenyament obligatori, i la presentació axiomàtica, pròpia de l'ensenyament superior.
Organitzem una experimentació amb la finalitat de donar resposta a les dificultats que l'esmentat ensenyament produeix en els estudiants i a la incidència que té en el seu aprenentatge. Tractaments quantitatius i qualitatius faciliten diagnosticar el punt de partida a l'inici de batxillerat, avaluar la incidència de la proposta en l'aprenentatge dels participants, recollir les dificultats que viuen els discents i els errors que cometen per, finalment, presentar una valoració de la implementació realitzada als ulls de l'alumne.
El marc teòric l'alimentem de reflexions didàctiques i possibles tractaments educatius que es poden donar al nombre enter, d'alguns apunts sobre la història del nombre negatiu que mostren la complexitat d'aquest contingut curricular i de recents recerques, diagnosis, disposicions educatives i extractes de llibres de text que permeten focalitzar les dificultats d'aprenentatge i preveure les mancances de l'ensenyament. Aquests fonaments els contrastem amb els resultats obtinguts per tal de mostrar, en atenció al context que ens ocupa, les conclusions de la recerca i diverses qüestions que suggereixen futures investigacions.
En el terreny de les implicacions didàctiques, més enllà de l'àmbit d'acció de la investigació realitzada, mostrem com una petita pinzellada del mètode deductiu pot alimentar la primera introducció que actualment s'implementa en la matemàtica escolar a través de models concrets, empírics o físics.
The didactics of the whole number constitutes the key focus of this research. We classify the teaching typologies of said curriculum content and focus our attention on one of them, the deductive method. We study the effect of its execution on students' learning and also the difficulties that it brings with it.
The teaching proposal which we implement is born out of the problem resolution of consecutive numbers. From an experimental study we arrive at a hybrid introduction of the whole number which connects the deductive teaching with the constructive one. We establish a didactic bridge between the empirical treatment of the whole number and the intuitive one, which characterises a first introduction to compulsory education, and axiomatic presentation, which is typical of higher education.
We are organising an experiment in order to provide a solution to the difficulties that said teaching produces in students and the influence it has on their learning. Quantitative and qualitative processes facilitate the diagnosis of the starting point at the beginning of the "batxillerat" (A-level), the evaluation of the incidence of the proposal in the learning of those participating, the gathering of difficulties encountered by students and the errors they make to, finally, present an evaluation of the implementation from the point of view of the student.
We feed the theoretical frame by didactic reflections and possible educational processes which can be given to the whole number, by some notes about the history of the negative number which demonstrate the complexity of this curriculum content and by recent research, diagnoses, educational provisions and extracts from textbooks which allow us to focus on the learning difficulties and foresee what teaching is lacking in.We contrast these foundations with the results obtained in order to demonstrate, in the context of what we are discussing, the research conclusions and diverse questions which future research suggests.
In the field of didactic implications, beyond the scope of action of the investigation carried out, we show how a little brushstroke of deductive method can feed the first introduction that is implemented nowadays in school mathematics through specific empirical or physical methods.
Landry-Michaud, Louis. "Conception, construction et validation d'un mécanisme novateur permettant d'effectuer des essais hybrides en temps réel contrôlés en force avec un vérin hydraulique." Mémoire, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/6061.
Full textLe, Gac Benoit. "Développement et caractérisation d’une connexion hybride béton-acier utilisée comme rupteur de pont thermique balcon-plancher en Isolation Thermique par l’Extérieur." Thesis, Rennes, INSA, 2018. http://www.theses.fr/2018ISAR0012.
Full textThe main goal of this Ph.D. thesis is the development and characterization of a hybrid balcony-floor connection used as a thermal break for externally insulated buildings. Structurally, it must ensure the transmission of a significant bending moment and a shear force due to the balcony cantilever. This system belongs to the hybrid connections still poorly described in the scientific literature and for which this thesis makes a contribution. Existing solutions to avoid balcony's thermal bridges involve architectural or technical constraints. Thermal break systems are structurally and thermally relevant solutions. The main existing systems do not involve steel concrete hybrid technology to date. The mechanical behavior of the developped system has firstly been tested under vertical static loading during a campaign of five tests. The results show a very ductile moment-rotation response that meets design expectations. As an extension of the experimental interpretation, a semi-empirical model has been developped. The gain of stiffness obtained by a specific anchoring detail has been quantified in relation to existing analytical models. The creep behavior of the connection, due to the concrete creeping at the interface with the hybrid elements has been the object of an experimental study. The link between the evolution of the connection rotation and the material creep coefficient has been established. A finite element mode! has been calibrated on the vertical loading tests and allowed to study in detail the behaviour of the system's shear key. The determination of the boundary conditions of the system justifies the force diagrams on the key. The last part of this work concerns the justification of the system under the fatigue loading provoked by the differential thermal expansion between the balcony and the floor. A series of tests under oligocyclic fatigue loading was performed to establish a resistance criterion and a study of the actual thermal stress action was completed. Finaly, the durability of the connection has been demonstrated. The development of this hybrid connection can be successfully considered and validates the suitability for a range of products. The industrialization and marketing of the product will go through a certification for which the justifications are already established and will be a guarantee of the scientific relevance of the system
Pont, Anne-Valérie. "Orner la cité : les enjeux culturels, sociaux et politiques de la construction et de la restauration des monuments publics dans les cités d'Asie et de Pont-Bithynie, du Ier au IVème siècle ap. J.-C." Paris 4, 2005. http://www.theses.fr/2005PA040207.
Full text" To embellish the city " through public buildings does not only designate a simple search for beauty. For inhabitants of ancient Greek cities living in the Roman provinces of Asia and Pontus-Bithynia in Western Asia Minor, making the city as beautiful as possible also means sharing cultural, social and political values. It mainly aims at showing, especially from the end of the Ist century until the end of the IVth century, that the City Council and its Assembly, as well as benefactors, keep to a still living ideal of civic life. This phenomenon which is irreducible to the Roman ideology is best approached through epigraphic and second sophistic discourses. It is one of the best ways to claim a Greek identity and a civic autonomy against always threatening governors. Until the end of the IVth century, the Greeks' ‘kosmos' reveals that Hellenism is still alive and capable of setting itself its own cultural and political goals in spite of a changing world
Le, Bloa Gaël. "Caractérisation du comportement sismique d’une connexion hybride plancher-voile utilisée comme rupteur de ponts thermiques." Thesis, Rennes, INSA, 2014. http://www.theses.fr/2014ISAR0027.
Full textThe main objective of the PhD thesis is the structural evaluation of a hybrid structural connection at the slab-to-wall junction in concrete shear wall buildings under seismic action. The lack of normative and scientific literature for the characterization of this kind of systems leads us to devise an original protocol for the characterization which is mainly built on a large-scale experimental analysis of behaviour of the slab-towall connection. First, we explain the reasons that led us to design an innovative thermal break system, the SLABE, which is thermally insulated hybrid connection for the slab-to-wall junction. Then we analyse the existing protocols for the cyclic characterization of similar structural systems ("coupling beams" or "shearheads"). Based on the outcome of this investigation, we propose an experimental program composed with three test series: two large-scale campaigns where the actual loading conditions in a building are reproduced (horizontal and vertical shear forces) and an axial test campaign. The test results provided the required information to correctly characterize the behaviour of the hybrid connection in the three directions in space. The results of the experimental campaigns are presented in detail. In particular, they show that the connection, under cyclic loads, exhibits a quasi-elastic and stable behaviour at usual seismic load levels, in France. In addition, these tests highlight the large reserve of ductility of the system that guarantees the robustness of the system. This is essential for seismic actions which have by nature a high degree of uncertainty. The impact of the slab-to-wall connexion on the structural behaviour of buildings is evaluated through a structural analysis on representative structures. We particularly analyse the modal response and the force redistribution between the internal and external shear walls. Based on the outcome of this study, we suggest a seismic design method for reinforced concrete structures equipped with these structural elements. Along with that, we propose a computational tool for engineers. The completeness of the presented validation approach makes it a benchmark, already recognized by the French authorities granting technical approvals. It could be proposed as a standard protocol for the validation of other thermal break systems or hybrid slab-to-wall connections, at European level
Passieux, Jean-Charles. "Approximation radiale et méthode LATIN multiéchelle en temps et en espace." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2008. http://tel.archives-ouvertes.fr/tel-00395693.
Full textLe, Thi Thu Ha. "Contribution à la détection, à la localisation d’endommagements par des méthodes d’analyse dynamique des modifications structurales d'une poutre avec tension : application au suivi des câbles du génie civil." Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1028/document.
Full textThe objective of this work is to develop methods to detect, localize, quantify and follow the evolution of the damage in short cables, such as suspenders of the suspension bridges, using their vibratory responses. To simulate these cables, a 1D Euler Bernoulli beam linear model with tension is used. This model allows to study a wide range of structures from the vibrating string to the beam without tension. For cables, damage is introduced into the vibratory equation by local changes of the linear density and the bending stiffness and a global change in the tension. To introduce a crack in the vibrating beam equation, the change in the rigidity may be replaced by a pinned joint at the location ofthe crack. For both these models, a first order analytical estimation of the variation of modal parameters due to theses changes is established. Using these analytical estimations of the relative frequency variations in functions of the physical changes, we develop methods of localization for two cases : only two tests corresponding to two states (healthy and damaged) and a series of tests (several tests on the healthy state and several tests on the damaged state). For the second case, we propose another method of detection and localization which uses the SVD tool . These methods are tested on numerical data and experimental data from literature or from tests performed during the phD
Rihan, Abdallah. "Sources laser non linéaires accordables dans l'infrarouge et l'ultraviolet pour la métrologie des rayonnements optiques." Phd thesis, Conservatoire national des arts et metiers - CNAM, 2011. http://tel.archives-ouvertes.fr/tel-00705888.
Full textHalla, Antonín. "Výukové a vzdělávací centrum." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226174.
Full textJurča, Radim. "Modulární kontejnerová stavba." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227835.
Full textJiang, Li. "Calcul en fatigue des ouvrages métalliques par la mécanique de la rupture (approche probabiliste)." Phd thesis, Ecole Nationale des Ponts et Chaussées, 1994. http://pastel.archives-ouvertes.fr/pastel-00569145.
Full textLe, Roy Robert. "Déformations instantanées et différées des bétons à hautes performances." Phd thesis, Ecole Nationale des Ponts et Chaussées, 1995. http://tel.archives-ouvertes.fr/tel-00529739.
Full textAouameur-Mesbah, Amel. "Analyse non-linéaire matérielle et géométrique des structures coques en béton armé sous chargements statiques et dynamiques." Phd thesis, Ecole Nationale des Ponts et Chaussées, 1998. http://tel.archives-ouvertes.fr/tel-00529774.
Full textCapaldo, Matteo. "A new approximation framework for PGD-based nonlinear solvers." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLN011/document.
Full textThe aim of this work is to introduce an approximation framework, called Reference Points Method (RPM), in order to decrease the computational complexity of algebraic operations when dealing with separated variable approximations in the Proper Generalized Decomposition (PGD) framework.The PGD has been introduced in [1] in the context of the LATIN method to solve efficiently time dependent and/or parametrized nonlinear partial differential equations in structural mechanics (see, e.g., the review [2] for recent applications). Roughly, the PGD technique consists in seeking the solution of a problem in a relevant Reduced-Order Basis (ROB) which is generated automatically and on-the-fly by the LATIN method. This latter is an iterative strategy which generates the approximations of the solution over the entire time- space-parameter domain by successive enrichments. At a particular iteration, the ROB, which has been already formed, is at first used to compute a projected Reduced-Order Model (ROM) and find a new approximation of the solution. If the quality of this approximation is not sufficient, the ROB is enriched by determining a new functional product using a greedy algorithm.However, model reduction techniques are particularly efficient when the ROM needs one construction only. This is not the case for the model reduction techniques when they are addressed to nonlinear problems. Indeed, in such a case, the operators which are involved in the construction of the ROM change all along the iterative process and no preliminary computations can be performed in advance to speed up the online process. Hence, the construction of the ROM is an expensive part of the calculation strategy in terms of CPU. It ensues from the need to evaluate the high-dimensional nonlinear function (and eventually its Jacobian) and then to project it to get the low-dimensional operators at each computational step of a solution algorithm. This amounts to being the bottleneck of nonlinear model reduction strategies.The present work is then focused on a further reduction of the computational cost, thanks to the introduction of a new approximation framework dedicated to PGD-based nonlinear solver. It is based on the concept of reference times, points and parameters and allows to define a compressed version of the data. Compared to other similar techniques [3,4] this is not an interpolation technique but an algebraic framework allowing to give an inexpensive first approximation of all quantities in a separated variable form by explicit formulas. The space of compressed data shows interesting properties dealing the elementary algebraic operations. The RPM is introduced in the PGD-based nonlinear solver to compute some repetitive operations. These operations are related to the resolution of the time/parameter problem that involves the update of the tangent operator (for nonlinear problems) and the projection of this latter on the Reduced Order Basis. For that the RPM allows to simplify and reduce the number of operations needed.[1] Ladevèze P., Sur une famille d’algorithmes en mécanique des structures, Comptes Rendus Académie des Sciences. Paris. Ser. II 300, pp.41-44, 1985.[2] Chinesta, F., Ladevèze, P., and Cueto, E. A short review on model order reduction based on proper generalized decomposition. Archives of Computational Methods in Engineering, 18, pp.395-404, 2011.[3] Barrault M., Maday Y., Nguyen N., Patera A., An ’empirical interpolation’ method: application to efficient reduced-basis discretization of partial differential equations, Comptes Rendus Académie des Sciences. Paris. Ser. I, 339, pp. 667-672, 2004.[4] Chaturentabut S., Sorensen D., Nonlinear model reduction via discrete empirical interpolation, Society for Industrial and Applied Mathematics 32(5), pp.2737-2764, 2010
Wu, Maio-chin, and 吳妙琴. "A Study on Teaching Eco-Pond Construction Planning in Primary School." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/57349694809332175115.
Full text中國科技大學
建築研究所
97
An eco-pond is the best teaching material to make primary students understand and learn how the ecological system works. In this regard, this article aims to determine how ecological functions may be injected in the construction planning stage, as well as the sustainable operations of the program in the teaching requirements. The development of the survey is based on the subject matter “nature” and all its relevant theories. Ten factors were established in the analysis of data. In view of this, the analysis results were able to capture the educational needs and requirements from which the construction principles for eco-pond program were derived. The principles for formulating the program consist of five points: (1) Define the objectives of the program. Spatial properties must be able to demonstrate the differences between water and land environment. For the teaching circumstances to be effective, the afore-mentioned changes must be capable of being observed, examined and experimented on. On the other hand, the property of time must demonstrate nature’s time-order changes. The course offered must also cover the development changes in ecological system in order to deliver the totality of the ecological concepts. (2) Set the overall implementation plan. Arrange the appropriate location and time based on learning and habitat requirements. (3) Develop ecological concepts. Simulate the food chain in converting wetland relationships to form a new ecological system. The environment conditions are used as a basis for building plant community and 3-dimensional habitat spaces. Designing a beautiful landscape based on natural landscapes. (4) Construction of an integrated water environment. The convenience and safety of the entire line and teaching space must be guaranteed so as to create a biological habitat that simultaneously functions as a teaching and observation material. (5) Implement sustainable operations management. Evaluate the course and preserve biodiversity in order to maintain equilibrium in the waters ecosystem. Integrate teaching activities with operations management and provide feedback on science experiments in order to establish the significance and value of the ecological teaching materials. The study on teaching eco-pond construction planning yielded the following conclusions: 1.The primary goal of the construction planning is to formulate a framework that would permit a self-designed waters ecosystem. 2.Promotion of biodiversity and habitat complexity can serve as the foundation for sustainable operation of the ecological functions. 3.Effort-saving measures and operational effectiveness can only be achieved through the joint participation of teachers and students. 4.The waters environmental health must be protected in order to create a fitting educational ground and to provide a suitable ecological teaching material.
Kutama, Makonde. "The construction and evaluation of a novel tubular photobioreactor at a small pilot plant scale." Thesis, 2012. http://hdl.handle.net/10352/266.
Full textThe mass production of algae for commercial purposes has predominately been carried out in open ponds systems. However, open ponds systems have a number of disadvantages such as poor light utilization, requirement for large areas of land and high risks of contamination. On the other hand, photobioreactors have attracted much interest because they allow a better control of the cultivation conditions than open systems. With photobioreactors, higher biomass productivities are obtained and contamination can be easily prevented. Photobioreactors can also be engineered to manipulate the light and dark photosynthetic reactions thus enhancing biomass productivity. The main objective of this study was to construct a novel tubular photobioreactor which had the ability to expose the cultured alga to light and dark phases with the aim of optimizing the algal biomass production. A novel tubular photobioreactor with the ability to manipulate the cultured alga’s light and dark photosynthetic reactions was constructed in this study. The alga Spirulina platensis was chosen as the test organism in this novel tubular photobioreactor due to a number of reasons such as its globally socioeconomic importance, its tolerance of higher pH and temperature values which makes it almost impossible to contaminate. The cultivation process of Spirulina in the photobioreactor was investigated through alternating light and dark cycles in an attempt to increase the photosynthetic efficiency of the culture. The effect of different light intensities on the growth of Spirulina in the novel tubular photobioreactor was investigated and it was found that the best light condition that favored higher biomass formation was at 600 μ mol m-2 s-1. Five different light/ dark ratios were evaluated at a light intensity of 600 μ mol m-2 s-1 during a batch mode of operation of the novel tubular photobioreactor. The light/ dark ratio of 1:0.25 was found to be the best ratio because it gave the highest biomass in the shortest period of time when compared to the other ratios used. These results seem to suggest that longer light cycle relative to dark cycle results in higher biomass production. The ratio of 1:0.25 was then used to operate the novel tubular photobioreactor in a continuous mode. A maximum biomass productivity of 25 g/m2/day was achieved which corresponded to a net photosynthetic efficiency of 5.7 %. This result was found to be higher than what most photobioreactors could achieve but it was 2.8 g/m2/day lower than the highest ever reported productivity in a photobioreactor when Spirulina is cultivated. The 2.8 g/m2/day lower was attributed to the different materials used in the construction of these two photobioreactors. The photobioreactor which achieved 27.8 g/m2/day was made up of a clear glass whereas the novel tubular photobioreactor was made up of a PVC tubing. PVC tubes tend to change from clear to a milky colour after a certain period when it is used at higher temperature and pH values hence blocks a certain amount of light. Therefore the main recommendation in this study is to use a PVC tubing with a longer life span when used at a higher temperature and pH values.
Clark, J. P. "Treatment of runoff containing suspended solids resulting from mine construction activities using sedimentation ponds." 1998. http://hdl.handle.net/2429/10378.
Full textDupuis, Agnès. "Traduire et interpréter : survol des constructions subjectives d'Ezra Pound et de Xi Chuan." Thèse, 2009. http://hdl.handle.net/1866/3945.
Full textThis dissertation strives to be a reflection on the importance of interpretation in a translation of poetic language. This reflection takes is point of departure from the example of Ezra Pound, translator of classic Chinese poems. It continues with an exploration of the interpretative possibilities included in language itself, concluding with a subjective experience of translation. I chose to translate three poems by Xi Chuan, a Chinese poet belonging to the obscure poetry movement. Obscure poetry is a contemporary literary movement which still continues today under the name of post-obscure poetry. Xi Chuan’s writings are an example of the search for a new expressive form for contemporary Chinese poets or, in other words, for the emergence of a subjective voice that is directly related to taking a stand with regard to the traditional past while striving for the emancipation and autonomy of literary expression. The place occupied by the obscure poet between the new and the old allows the individual to interpret the present in a manner that is more personal. In the same way, the translator has to break away from the past (in other words, the original text) to allow for interpretation and the projection of the new text into the future (that is, the receiving language).
TSAI, HSIAO-TEN, and 蔡小燕. "An E-learning Platform Constructing for A class of Ping-Pong Education." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/77758848403175318752.
Full text聖約翰科技大學
電機工程系碩士在職專班
105
ABSTRACT This thesis employs some E-Learning technologies to construct a class of Ping-Pong education platform. Also there is some Expert System technologies are embedded in this teaching system of the proposed platform. There are some special features in the proposed method. 1. Easy Learning- The proposed Ping-Pong teaching platform can be easily handling. 2. Adjusting the skills- The proposed platform can be effortlessly read and operated. 3. Recording the effect- The proposed platform can record the user’s training results. 4. Interactive Learning- The proposed platform can be operated in interactive situation as to the users and instructors. Numerous simulations have been made to demonstrate the efficiency of the proposed system. Keywords: E-Learning, Expert System, Ping-Pong, Interactive Learning
"Photonic devices and subsystems for future WDM PON and radio over fiber technologies." Thesis, 2010. http://library.cuhk.edu.hk/record=b6074887.
Full textIn order to reduce the complexity and costs of ONU transceiver, we propose a scheme based on a nonreciprocal optical modulator and a linear loop mirror for receiving downstream and sending upstream data We show that the nonreciprocity of traveling wave electrodes can selectively impress signal modulation onto the reflected upstream signals only. Monolithic integrated transceivers may thus remodulate downstream signals for upstream data transmission without needing integrated optical circulators. The proposed ONU is thus compatible with monolithic integration.
In this thesis, we describe our research on photonic devices and subsystems for future access networks. Since optical network units (ONUs) are the most cost-sensitive parts, we first investigate the use of advanced modulation format in colorless ONU structure. We implement a scheme which uses dark return-to-zero (DRZ) for downstream transmission and remodulation of it using a differential-phase-shift-keying (DPSK) for upstream both at 10 Gb/s. We also experimentally demonstrate silicon microring based optical frequency discriminators for use in demodulating DPSK and differential-quadrature-phase-shift-keying (DQPSK) signals. We show that the scheme is robust to variations in bit-rates in contrast with conventional Mach-Zehnder delay interferometer scheme.
Internet traffic has undergone tremendous growth in the past decades and has already penetrated into the daily lives of the general population. Demand for new high bandwidth services is beginning to drive the deployment of optical fiber-based access networks to solve the so-called last mile bottleneck around the world. Passive optical networks (PON) are attractive because there are no active components in the transmission line, thus reducing operational and deployment costs. Time-division-multiplexing (TDM) used in currently deployed PON, in which the bandwidth is shared among the users by time domain multiplexing, does not fully utilize the bandwidth potential of optical fibers and will not be able to satisfy the bandwidth demand in access networks in the near future. Among the advanced multiplexing techniques, wavelength-division-multiplexing (WDM) PON is a good candidate technology for providing sustained bit-rates beyond 10 Gb/s in access networks. However, reduction of costs in WDM PON remains a key challenge for their practical deployment.
Wired and wireless hybrid optical access networks are also investigated. Radio-over-fiber is one low-cost approach to deliver broadband wireless services, in which radio signals at the carrier frequency are delivered over optical networks from a central office to remote antenna base stations. Generation of high frequency carrier and radio frequency fading are the main research challenges. We propose and demonstrate frequency upconversion based on frequency doubling and quadrupling. Novel wired and wireless hybrid subsystems that mitigate millimeter-wave signal distortion are also demonstrated.
Xu, Lin.
Adviser: H. K. Tsang.
Source: Dissertation Abstracts International, Volume: 72-04, Section: B, page: .
Thesis (Ph.D.)--Chinese University of Hong Kong, 2010.
Includes bibliographical references.
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. Ann Arbor, MI : ProQuest Information and Learning Company, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstract also in Chinese.
Nigrin, Tomáš. "Izolovaný ostrov : Západní Berlín pod správou Willyho Brandta (1961-1966). Město za berlínskou zdí." Doctoral thesis, 2010. http://www.nusl.cz/ntk/nusl-299130.
Full textLubovský, Zbyněk. "Právní úprava rybářství." Doctoral thesis, 2014. http://www.nusl.cz/ntk/nusl-332535.
Full textBlair-Pereira, Joao-Nicolas. "Tectonique moléculaire : vers l'utilisation du dispirofluorène-indénofluorène comme unité de construction pour bâtir des réseaux cristallins poreux." Thèse, 2013. http://hdl.handle.net/1866/9817.
Full textSupramolecular chemistry is a field of rapidly increasing interest in recent years. The field uses weak intermolecular interactions to control molecular organisation and therefore modulate the properties of materials. Adequate selection and positioning of functional groups, combined with a carefully selected molecular core to which the groups are attached, allows for the creation of molecules with a high degree of predictability in the way they will interact with their neighbours. This approach to the design and construction of materials, called molecular tectonics, is based on subunits called tectons (derived from the Greek word for builder), which use weak interactions to organise themselves in a predictable manner and generate novel supramolecular architectures. In favorable cases, the interactions can counter the general tendency shown by molecules to pack together in a compact manner. Instead, specific functional groups direct molecular recognition and help guide the process of auto-assembly. At the same time, the molecular core of the tecton is also of capital importance as it must allow an optimal orientation of the recognition groups. The molecular tectonics approach, used jointly with crystallisation, opens the door to new opportunities in crystal engineering. For example, crystal engineering now allows the logical creation of porous crystalline networks that can accept guest molecules. Although any type of weak interaction can hold such networks together, the hydrogen bond is favored for constructing porous supramolecular networks. The strength, directionality and versatility of the hydrogen bond accounts for its special importance in the domain of crystal engineering. A recognition group of particular interest in crystal engineering is the 2,4-diamino-1,3,5-triazinyl unit. This unit forms hydrogen bonds according to various standard motifs. The use of this recognition group, joined to molecular cores specifically designed to inhibit close packing, such as Onsager crosses, allows for the construction of supramolecular networks with high porosity, as shown by the behaviour of 2,2’,7,7’-tetrakis(2,4-diamino-1,3,5-triazin-6-yl)-9,9’-spirobi[9H-fluorene]. We present here an extension of previous studies of spirobifluorenyl cores by describing the synthesis and structural analysis of molecules with related dispirofluorene-indenofluorenyl cores. This new core offers the same characteristics as the spirobifluorenyl core, namely rigid topology and an Onsager cross molecular shape which are known to inhibit close packing. We have combined this core with a variety of recognition groups to verify the influence of the molecular core on the crystalline networks generated, particularly on the volume accessible to guest molecules.