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Pavlenko, V., and O. Volianyk. "Efficiency of window recuperator in residential premises." Thesis, Київський національний університет технологій та дизайну, 2019. https://er.knutd.edu.ua/handle/123456789/14631.
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RODRIGUES, DE CASTRO FELIPE. "Novel Axisymmetric Diffusion Bonded Recuperator for Gas Turbines." Doctoral thesis, Università degli studi di Genova, 2022. https://hdl.handle.net/11567/1102533.
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The small gas turbines systems, arbitrary categorized as microturbines (5-200 kW) and miniturbines (200-500 kW) are the current most economical solution for the distributed power generation market. The thermal efficiency of such microturbines without and with a recuperator is about 20 and 40% respectively, thus a recuperator is mandatory to reach higher cycle efficiencies. However, the recuperator accounts for about 25-30% of the turbine total cost and its temperature and pressure are constrained depending on the material and construction method, being the bottleneck of the improvement and advancement of this kind of power generation plant. Thus, the actual focus is to develop high performance recuperators able to withstand high temperatures and pressure at minimum cost. There are several different recuperators present on the market, each with their own heat transfer surface and manufacturing method, but all present drawbacks and are relatively old compared to the actual manufacturing methods. For instance, the rectangular offset strip fin geometry, which is one of the highest performance surfaces, is expensive to manufacture and weak to withstand temperature and pressure due to brazing requirements. Hence, in this thesis, a completely novel modular axisymmetric recuperator concept is proposed, joined by diffusion bonding technique, one of the current most advanced heat exchanger manufacturing methods. For the recuperator core, a novel heat transfer surface is proposed based in the rectangular offset strip fins, the thermal and hydraulic characteristics of which were determined experimentally. The devised heat transfer and pressure drop correlations show 85% agreement with the experimental data in the range of 500<3000. A code for the recuperator design, using entropy generation minimization, was developed to predict the recuperator performance and size the optimum recuperator core dimensions. The design code was validated with CFD which in turn was validated with experimental data. The heat transfer and pressure drop CFD results agreed the experimental data with deviation within 3.2% and 27.7%, respectively, and the design code agreed the CFD results with deviation within 0.9% and 11.9%, respectively. Four recuperator study cases for different turbine sizes, 100kW, 100kW_beta, 1250kW and 5000kW, were designed using the design code. The results show the proposed concept can achieve high effectiveness (~90%) with low pressure drop (<4%) with a volume compatible with the current recuperators. Furthermore, the novel recuperator concept has a list of advantages, which makes attractive its application on the future gas turbines, encouraging the research continuity of the proposed concept.
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Corbeil, Antoine. "Study of Small Hydraulic Diameter Media for Improved Heat Exchanger Compactness." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19837.
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Solar radiation offers phenomenal potential for energy conversion with energy densities on the order of 1000W/m2 in locations with regularly clear skies. As always, the difficulty lies in finding a solar-electric conversion technology capable of producing electricity at a competitive cost. The SolarCAT (Solar Compressed Air Turbine) system produces electricity by releasing stored compressed air through a series of turbines with solar dish concentrators providing the required heat for efficient conversion to electricity. To minimize impact on capital cost, high recuperator effectiveness targets are sought but unlike typical fuel-fired micro-turbines, raising the recuperator effectiveness of the solar power system yields a benefit in overall system capital cost. Improving efficiency lowers the size and cost of the largest element of the system, namely the dish.
In this study potential techniques for achieving a highly compact heat-transfer media were reviewed. Folded fin, packed beds, micro-tubes, lattice frame structures, metal foams, woven textile, and micro-machining techniques were assessed. Textile structures were selected as an appropriate medium to replace the internal folded fin of the SolarCAT recuperator. The relatively long flow (>150mm) path through the proposed screen wafers requires a model for fully-developed forced convective flow between parallel plates. A mathematical model was developed by integrating the results from the work of several authors in the field of textiles and porous media. #100 mesh sintered screen wafers were brazed between two 0.25mm stainless steel sheets and destructively tested to assess their tensile strength. Although
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optimization of the braze parameters was not completed, it was found that many samples survived exposure to internal pressures in excess of 50MPa.
This study found that the use of sintered screen wafers to replace the internal folded fin of the SolarCAT recuperator would have advantages over the current design with respect to both overall recuperator effectiveness, size, and cost. Textile structures can be tailored to have wide range of fluid and heat-transfer properties depending on the application. The manufacturing process is relatively simple and could be cost-effective for high-volume production.
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Koekemoer, Werner. "An investigation of the manufacturability of tungsten-copper for use in a compact recuperator / W. Koekemoer." Thesis, North-West University, 2008. http://hdl.handle.net/10394/4213.
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A substantial raise in recuperator effectiveness has been established in the past by
improving the fabricating and joining configurations regarding the manufacturing of
compact recuperators. Further advancement of state-of-the-art recuperators requires
providing for increased temperatures and pressures. 1bis can only be achieved by
incorporating high temperature materials into the recuperator design. Although many
high temperature materials have been identified in past research, less of these can be
utilized in new concepts due to difficulties regarding fabricating and joining. However
recently, in an independent study, a tungsten-copper alloy was identified through detailed
material selection methods as a suitable material for high temperature applications. The
validity of tungsten-copper regarding fabricating and joining, to establish a leak tight
structure still needs to be demonstrated.
The aim of the study is to carry out a comprehensive review of existing recuperator
technologies and design methodologies as well as to investigate the manufacturability of
tungsten-copper for use in a recuperator design of limited size. More specifically, the
objectives entail the following: (1) The comprehensive review of existing recuperator
technologies and recuperator design methodologies, (2) The design and fabrication of a
recuperator of limited size using tungsten-copper as a heat transfer material and (3) The
determination of the feasibility of fabrication of the design and the applicability of the
selected W -eu alloy in the design.
The fabrication technique that is presented in the design entailed the use of 2.Irm tungsten
carbide drill bits to machine the correct recuperator profile, while the recuperator unit
was joined by utilizing a mechanical fastening system. Although diffusion bonding was
initially identified as the ideal joining technique for the recuperator of this research, restrictions and limitations relating to the use of diffusion bonding has lead to the
identification of a fastening system as the technique used. Evaluation of the fabricated
recuperator revealed that several factors were outside the initially specified values, inter
alia the flatness tolerance of recuperator plate geometries and machined slots precision.
These factors contributed to a leaJdng recuperator structure when tested. The most likely
contributing factors for the latter relate to non-conforming tolerances achieved in the
fabricated design, residual stresses induced by the machining process as well as design
issues relating to the recuperator plate geometries.
The design and fabrication of a recuperator of limited size using tungsten-copper as a
heat transfer material, requires re-evaluation. Similar work will ensure a design of a high
quality when provision is made for advanced surface fmishing of machined parts (notably
the recuperator plate geometries), slight modifications to the design as well as stress
relieving of machined components for the purpose of eliminating any residual stresses
thatJnight be present.Thesis (M.Ing. (Mechanical Engineering))--North-West University, Potchefstroom Campus, 2009.
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Carman, Bradley Gene. "Design of a high effectiveness ceramic micro-channel heat recuperator for micro-turbine application." Honors in the Major Thesis, University of Central Florida, 2002. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/262.
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This item is only available in print in the UCF Libraries. If this is your Honors Thesis, you can help us make it available online for use by researchers around the world by following the instructions on the distribution consent form at http://library.ucf.edu/Systems/DigitalInitiatives/DigitalCollections/InternetDistributionConsentAgreementForm.pdf You may also contact the project coordinator, Kerri Bottorff, at kerri.bottorff@ucf.edu for more information.Bachelors
Engineering
Mechanical Engineering
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Dellar, Kyle Eric. "Clamped plate-style recuperator for a small-scale solar thermal brayton cycle using high-temperature sealant." Thesis, University of Pretoria, 2019. http://hdl.handle.net/2263/73467.
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South Africa is plagued by rolling blackouts, and many citizens do not have access to electricity or clean water. A personalised micro-turbine power generation system presents a solution to this issue and may become as commonplace as a personal computer. With South Africa’s excellent solar direct normal irradiation (DNI) levels, a small-scale recuperated solar thermal Brayton cycle (STBC) shows enormous potential. However, a recuperator comprises up to 30% of the capital cost associated with a micro-turbine package and requires complex and costly manufacturing methods within a South African context. Thus, the objective of this research is to investigate a clamped plate-style recuperator that can be cost-effectively manufactured locally. Literature was consulted and criteria were outlined that a recuperator in a Brayton cycle should adhere to. To uphold these requirements, a counterflow plate-style recuperator is mandatory, and to combat complex manufacturing methods, a gasketed stacked-plate design, which requires a gasket material, was proposed. A sodium silicate-based sealant called Soudal Calofer is available locally and can withstand the operating conditions of an STBC. Experimental testing was carried out successfully on two small-scale versions of the proposed recuperator design. Testing showed that the physical construction was simple and cost-effective and the clamped plate-style high-temperature sealant combination worked well to form the recuperator core, facilitating an easy assembly and disassembly process. The construction sustained an airtight seal (Mark I) for the entire testing period at various pressures and high temperatures. Despite the occurrence of heavy soot-based fouling deposits during Test 1 due to incomplete combustion of the LPG as a result of the very low air mass flow rates, a mathematical model was able to match the values gathered from the testing. The data showed a cold-side effectiveness of 58.6% and a total pressure loss of 17.78%. For Test 2, a cold-side effectiveness of 82.5% and a total pressure loss of 11.48% were found for the recuperator core, which also validated the mathematical model. A case study was performed for the small-scale STBC. The results showed that the combination of a cold-side effectiveness of 84% and a total pressure loss of less than 5% could be attained when implementing the recuperator within the STBC for a channel height of 1 mm and width of 50 mm. Alternatively, if pressure loss is of less concern, a cold-side effectiveness of 89% could be achieved by increasing the total pressure loss to 19 kPa, which equates to an 8.8% pressure loss. It is recommended that a large-scale recuperator be built and tested to confirm the performance characteristics of larger mass flow rates and that the insulation of the unit be varied to determine its effects. Gasket geometry and the assembly method also need to be further researched to develop a uniform and consistent assembly technique that results in an airtight seal for every unit assembled. This may be achieved by regulating the amount of water added to the Soudal Calofer for thinning purposes to achieve a consistency which facilitates uniform application and by extended drying time to allow for the assembly to be completed, while not thinning the sealant so much as to lead to a seal failure. In conjunction, the clamping force distribution is critical to sealing the inner channel division. It is also recommended that the usable lifespan of such a recuperator be determined. Most crucially, thermal and pressure cycling must be investigated, especially where seal integrity is concerned.Dissertation (MSc)--University of Pretoria, 2019.
Mechanical and Aeronautical Engineering
MSc
Unrestricted
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Kovář, Radim. "Uzavřený oběh plynové turbiny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227952.
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Diploma thesis deals with the gas turbine closed cycle. The first part concerns the maximum of theoretical efficiency and practical excutable efficiency for the cycles without regeneration, cycles with regeneration and cycles with regeneration with split compression. The second part concerns the optimalization of the recuperator towards the speed of gas flow in the pipes of the recuperator. The third part includes weight and size design of two kinds of recuperators for different levels of regeneration.
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Hawn, David Phillip. "Development of a Dynamic Model of a Counterflow Compact Heat Exchanger for Simulation of the GT-MHR Recuperator using MATLAB and Simulink." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1236091152.
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Zhang, Chengyu [Verfasser], Volker [Akademischer Betreuer] Gümmer, Volker [Gutachter] Gümmer, and Harald [Gutachter] Klein. "Evaluation of the Potential of Recuperator on a 300-kW Turboshaft Helicopter Engine / Chengyu Zhang ; Gutachter: Volker Gümmer, Harald Klein ; Betreuer: Volker Gümmer." München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1211725332/34.
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Siravičius, Vytautas. "Kombinuotų pašarų džiovinimo proceso tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120831_105530-15700.
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Šiuo metu populiariausias konservavimo būdas yra džiovinimas. Džiovinimas – tai technologinis procesas, kurio metu yra pašalinama iš produkto drėgmė, tokiu būdu prailginamas produkto tinkamumo laikas, tuo pačiu išlaikomos arba pagerinamos medžiagų savybės. Džiovinimo metu svarbiausia išlaikyti kokybę, kad džiovinamoje medžiagoje nepakistų pagrindinės medžiagų savybės. Ekstrudavimo procesas suintensyvina kombinuotųjų pašarų džiovinimo procesą. Magistrantūros darbo tikslas – ištirti ekstruduotų kombinuotų pašarų šunims džiovinimo procesą konvejerinėje džiovykloje. Atlikus informacijos šaltinių apžvalgą yra išanalizuotas džiovinimo procesas,džiovinimo būdai, džiovinimo proceso teoriniai pagrindai, šilumos rekuperatorių panaudojimo studija ir kombinuotų pašarų šunims procesas. Ekstruduotieji kombinuotieji pašarai konservuojami išgarinant perteklinę drėgmę konvejerinėje džiovykloje, sumažinant drėgnumą nuo 19,60 iki 8,51 %, kuris atitinka standarto reikalavimus. Džiovinant pašarus konvejerinėje džiovykloje buvo sunaudota 14000 kJ/kgvandens šilumos vienam kilogramui drėgmės išgarinti. Šilumos kiekis reikalingas džiovinimo procesui 654,48 kW. Nustatyta, kad rekuperatoriaus naudingumo koeficientai yra 72%. Šilumos kiekis reikalingas džiovinimo procesui 654,48 kW. Rekuperatorimi konpensuojamos grąžinamos šilumos kiekis yra 471,50 kW.Currently drying is the most popular conservation method. Drying is a technological process, which removes moisture from the product, in this way the shelf life of the product is extended, at the same time the properties of materials are maintained or upgraded. It is important to maintain the quality in the process of drying in order to avoid unwanted changes of main characteristics of the drying material. The aim of master thesis is to explore drying process in conveyor dryer for the extruded combined feed for dogs. The analysis of the material data was performed specific attention paying to the process of drying, the methods of drying, theoretical background of drying, the study of the heat recuperator use and the process of combined feed for dogs. Extruded combined feed in conveyor dryer is preserved by evaporating excess moisture, the moisture is reduced from 19,60 to 8,51%, which complies with the requirements of the standard. For the feed drying the amount of heat to evaporate one kilogram of water in the conveyor dryer is 14000 kJ/kgH2O. The quantity of heat needed for the drying process is 654,48 kW. It was established that the efficiency units of recuperator are 72 %. The quantity of heat needed for the drying process is 654,48 kW. Compensated returned heat amount in recuperator is 471,50 kW.
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Holdren, Matthew C. "Capability Study of Lattice Frame Materials for Use as Recuperative Heat Exchangers in Aircraft Systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1554463168699054.
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Hejčík, Jiří. "Vysoce účinný rekuperátor spalin." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-233861.
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This thesis deals with the high efficiency gas turbine recuperator design and its production methods. First part of the work presents an analysis of basic constructions and materials used for present recuperators. The requirements on the recuperator for a low emission gas turbine power source are then specified and the recuperator is designed according to the available literature sources. The quality of the heat transfer surface is examined by CFD modeling using the commercial CFD code Star-CD. The second part deals with the recuperator manufacturing and experimental validation of the designed recuperator performance. This section describes ways to build the recuperator matrix, technologies available to assemble the recuperator and methodology of measurements. Experimental results are presented including a discussion of the uncertainties of determining individual variables. Finally the engineering equations are found based on the experimental data obtained, that can be employed to design the recuperator.
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Паламарчук, О. М., and Г. С. Ратушняк. "Шляхи підвищення енергоощадності при створенні мікроклімату в адміністративнопобутових приміщеннях виробничого комплексу." Thesis, ВНТУ, 2018. http://ir.lib.vntu.edu.ua//handle/123456789/23300.
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Проаналізовано доцільність впровадження роторного рекуператора в припливно-витяжні системі для
забезпечення мікроклімату в адміністративно-побутових приміщеннях, що дозволять забезпечити санітарні
норми мікроклімату. Приведено переваги використання саме роторного теплообмінника на відміну від
звичайного. Проаналізовано доцільність впровадження саме бітермічного теплообмінника, на відміну від
пластинчастого в системі опалення та гарячого водопостачання.The expediency of the introduction of the rotary recuperator in the inflow and exhaust system for the maintenance of microclimate in the administrative-household premises, which will ensure the sanitary norms of the microclimate, is analyzed. The advantages of using a rotary heat exchanger in contrast to the usual one are given. The feasibility of introducing a bi-thermal heat exchanger, in contrast to the plate-type in the heating and hot water supply system, has been analyzed.
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Oliveira, Rosa Maria Freitas. "Recuperar." Master's thesis, Universidade de Lisboa, Faculdade de Arquitetura, 2017. http://hdl.handle.net/10400.5/15389.
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Dissertação de Mestrado Integrado em Arquitetura, com a especialização em Interiores e Reabilitação do Edificado apresentada na Faculdade de Arquitetura da Universidade de Lisboa para obtenção do grau de Mestre.N/A
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Grmolcová, Eliška. "Vzduchotechnické jednotky pro větrání bytů." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-371928.
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This diploma thesis deals with small air-conditioning units for ventilation of flats and family houses. First, I studied two compact air-conditioning units, processed measured data, comparing and evaluating a unit with better technical characteristics. The second task is to process variants of design solutions for the ventilation of a family house. The first variant calculates with only one air-conditioning unit when ventilating, in the second variant two air-handling units are designed. These variants were then compared and evaluated in terms of acquisition cost and operating costs.
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Pieri, Stefano <1977>. "Multi-objective optimization of microgas turbine recuperatos." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/415/1/Tesi_Pieri_Stefano.pdf.
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Pieri, Stefano <1977>. "Multi-objective optimization of microgas turbine recuperatos." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/415/.
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Murcia, Pérez Ramiro. "Empresa Recuperadora y Recicladora de Plastico." Tesis, Universidad de Chile, 2011. http://www.repositorio.uchile.cl/handle/2250/102708.
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Lee, Dong Ho Carleton University Dissertation Engineering Mechanical. "Flue gas waste energy recovery optimization with spray recuperators." Ottawa, 1987.
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BONNET, FREDERIQUE. "Posturographie et recuperation de l'equilibre chez l'hemiplegique." Lyon 1, 1994. http://www.theses.fr/1994LYO1M099.
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Binda, Forno Stefano. "Automatización de una planta recuperadora de arena." Bachelor's thesis, Universidad Ricardo Palma, 2011. http://cybertesis.urp.edu.pe/handle/urp/1172.
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Por medio de la automatización podemos realizar tareas que antiguamente eran demasiado peligrosas o que requerían demasiado tiempo para su desarrollo, ya que al realizar una implementación e integración programando cada una de las diferentes etapas del sistema para realizar una tarea específica se reduce el tiempo de operación y se optimiza el trabajo.
Para generar procesos más seguros para el ser humano, debido a que pueden ser monitoreados a distancia evitando el contacto directo a lo indispensable es decir por motivos de reparación o mantenimiento preventivo.
Ahorrando tiempo y dinero, por ser más eficientes, rápidos, confiables y precisos.
Durante el desarrollo de este proyecto se procederá a automatizar una planta recuperadora de arena, utilizada en fundiciones de acero y metalurgias como materia prima para la realización de moldes de piezas fundidas especificas, con la finalidad de reducir costos y optimizar el sistema. Para este fin expondremos y haremos uso de sensores y transmisores que se encargaran de enviar información a los respectivos controladores y medidores. Entre los sensores y transmisores que utilizaremos se consideraran capacitivos (ON-OFF), manómetros, presostatos, sensores de temperatura entre otros, lograremos controlar las válvulas neumáticas las cuales, actuarán, con la finalidad de realizar el proceso deseado de una manera precisa. Además el sistema tendrá la autonomía de escoger y direccionar el producto reciclado, a los silos para su correcto almacenamiento.
Como se indica y se explicará a lo largo de esta tesis el proyecto involucra la Automatización de una Planta recuperadora de Arena, basándonos en el formato típico de estas, es decir no se considerará cálculos mecánicos ni industriales, solo se procederá a automatizar lo existente en función de los parámetros mínimos requeridos por el sistema.
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Filho, Francisco da Costa Saraiva. "Proposta de recuperador dinâmico para correção de afundamentos de tensão." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-10052003-225059/.
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Proposta de correção de afundamentos de tensão (Sags) de acordo com curva CBEMA rev. 2000. Correção de Sags até 50% da tensão nominal. A qualidade da energia está fortemente relacionada à qualidade da forma de onda da tensão de rede. A ocorrência de distúrbios na rede que provocam afundamentos de tensão (Sags) são atualmente os grandes causadores do mau funcionamento de cargas alimentadas pelo sistema elétrico. Condicionadores/Estabilizadores de tensão projetados e/ou fabricados atualmente no Brasil, em sua grande maioria, não atendem e nem asseguram a devida correção da tensão para grande parte dos Sags mais intensos observados freqüentemente na rede elétrica. A nova curva ITI CBEMA-2000 fixa desempenho e suportabilidade mínimos que as cargas sensíveis atuais devem atender. Neste trabalho propõe-se um equipamento recuperador de tensão constituído por um transformador Soma-Subtrai e chaves estáticas utilizando dois tiristores em anti-paralelo. Essa topologia foi escolhida devido à sua simplicidade de implementação possibilitando, dessa forma, o desenvolvimento de um equipamento bastante atraente em termos econômicos. Apresenta-se um anteprojeto de um equipamento de 135kVA/220V e avalia-se o seu desempenho através de simulações estáticas e dinâmicas utilizando-se para isso o programa ORCAD PSpice versão 9.1.Power quality is strongly related to the mains voltage waveform quality. Decrease of the mains voltage RMS value (Sag) are nowadays the most important cause of electric loads malfunction. Line conditioners/stabilizers designed and manufactured today in Brazil do not attend the needs of voltage corrections of stronger Sags that frequently occur in the utility grid. New ITI CBEMA-2000 curve defines minimum performance and supportability that loads must have in these events. This paper proposes a voltage restorer equipment composed by a Buck-Boost transformer and static switches with back-to-back connected thyristors. This topology was chosen due to its simple implementation that allows a development of a low cost equipment. The preliminary sketch of a 135kVA/220V equipment is presented and its performance evaluated through statics and dynamics simulations using ORCAD PSpice 9.1 software.
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Aguiar, Márcio Luiz. "Recuperar ou liquidar empresa em crise." Florianópolis, SC, 2005. http://repositorio.ufsc.br/handle/123456789/102218.
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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção.Made available in DSpace on 2013-07-16T00:21:16Z (GMT). No. of bitstreams: 0
O presente trabalho se debruça sobre a nova lei de falências, recentemente aprovada pelo Congresso Nacional, buscando evidenciar em seu escopo as alternativas da empresa em panorama de crise econômico-financeira. Perfilhando uma leitura cruzada entre Direito e Engenharia de Produção, analisa os conceitos de empresa, insolvência, crise, falência e recuperação judicial, entre outros, tanto sob a ótica legal quanto sob os enfoques gerencial e mercadológico, procurando, assim, conformar as perspectivas da empresa em crise, de acordo com os diversos interesses que compõem a realidade da atividade econômica. Utilizando-se do método dedutivo, bem como do procedimento monográfico com base na revisão bibliográfica, traz à tona os princípios que regem a situação jurídica da empresa em crise, assim como infere dos referidos dispositivos legais, os principais aspectos de mercado que neles se inserem. Munido de tais informações, estabelece critérios úteis para a averiguação coerente e factível da possível recuperação de uma empresa, preocupando-se com a utilização otimizada dos institutos consagrados no novo diploma.
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Moura, Nuno Miguel Falcão de. "Controlador e device drivers para um recuperador de calor a pellets." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/12682.
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Mestrado em Engenharia Eletrónica e TelecomunicaçõesHoje em dia é dada uma grande importância à sustentabilidade energética, procurando-se cada vez mais optar por fontes de energia renováveis. Os pellets são uma das fontes desta energia, sendo um combustível utilizado maioritariamente em sistemas de aquecimento, como os fabricados pela Ecoama. Existem vários controladores genéricos para este tipo de sistemas, apresentando no entanto várias contrariedades, como o custo elevado e a impossibilidade de adição de funcionalidades. Nesta dissertação desenvolveu-se um protótipo de um controlador para um recuperador de calor. Este tem uma elevada possibilidade de customização, de forma a adaptarse a outros aparelhos da Ecoama. Ao projetar um controlador específico foi possível assegurar que este se adequa aos equipamentos, cumprindo as especificações e tendo um baixo custo. O sistema desenvolvido foi testado no recuperador, tendo-se verificado a sua funcionalidade, bem como a da aplicação criada para computador, que permite a configuração do controlador. Construiu-se uma base sólida para a continuação do projeto, tendo como objetivo final a criação de um produto comercial.
Nowadays, society is very focused on energetic sustainability, with renewable energy sources becoming more and more prominent. Pellets are one of these sources, being a fuel mainly used in heating systems, such as those manufactured by Ecoama. There is a wide range of generic controllers for this kind of systems. However, they present a considerable amount of drawbacks, such as their high price and the impossibility of adding new functionalities. In this dissertation a prototype for a pellet stove controller was developed. This controller has high customization capability, in order to be able to adapt to other devices of Ecoama. By designing a specific controller it was possible to ensure that it is adequate to the systems, fulfilling all specifications and having a low cost. The developed system was tested in the stove, where its functionality was verified. The computer program created in order to permit the configuration of the controller was also tested. A solid base was created for the project follow up, with the final goal being the creation of a commercial product.
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Peloille, Manuelle. "Fascismo en ciernes : España 1922-1930 : textos recuperados /." Toulouse : Presses universitaires du Mirail, 2006. http://catalogue.bnf.fr/ark:/12148/cb401124322.
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Texte remanié de: Thèse de doctorat--Études ibériques et ibéro-américaines--Bordeaux 3, 2001. Titre de soutenance : La représentation du fascisme dans la presse espagnole : trompe-l'oeil et lignes de partage.Bibliogr. p. 163-166.
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Plant, Sarah Jane. "Critique and recuperation in twentieth century philosophical discourse." Thesis, University of Manchester, 1989. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.642938.
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Puig, Serramitja Josep. "Avaluació del procés de desintegració de papers recuperats." Doctoral thesis, Universitat de Girona, 2004. http://hdl.handle.net/10803/7782.
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La desintegració és una etapa important en la recuperació de paper vell, ja que té importants conseqüències en consum d'energia i en el comportament de les etapes posteriors.Per això els objectius es centren en analitzar la desintegració des del punt de vista del temps de desintegració, els aspectes energètics, modelització de la màquina de desintegració utilitzada i anàlisi dels factors de cisallament calculats com a mesura global de les forces implicades en la desintegració. Els autors que hi han treballat donen diferents explicacions a aquestes forces. Fins avui només s'ha pogut avaluar qualitativament la influència que tenen cada un dels mecanismes en el temps necessari per a desintegrar i en el consum energètic.
Les característiques reològiques de les suspensions papereres, i el seu comportament no newtonià tenen una clara influència en el consum energètic i les forces de desfibrat en el desintegrador.
Els experiments de desintegració s'han realitzat en un púlper convencional, amb tres tipus de paper recuperat: paper estucat d'alta qualitat imprès offset (PQ), paper revista estucat imprès en color (PR), paper blanc imprès en impresora làsser (PF).
Anàlisi del temps de desintegració
Per cada un del papers estudiats (PQ, PR i PF), les fraccions màssiques des de 0.06 fins a la màxima que estat possible per cada paper (de 0.14 a 0.18), i a dues velocitats d'agitació diferents, s'ha determinat el temps de desintegració (tD) fins a aconseguir un índex de Sommerville de 0.01%. S'obté que en augmentar la fracció màssica disminueix potencialment el temps de desintegració.
S'ha estudiat la velocitat de desintegració, la producció teòrica del púlper en cada cas, i la seva relació amb les forces d'impacte i de fregament que produeixen la desintegració.
Aspectes energètics
El consum específic d'energia (SEC), definit com l'energia consumida per a desintegrar 1 kg de paper recuperat, disminueix molt en augmentar Xm, ja que a més de disminuir l'energia consumida en cada desintegració, el contingut en paper és més elevat.
Pel disseny de desintegradors, cal tenir en compte que en augmentar Xm i en augmentar la velocitat, sempre augmenta la potència consumida. Però així com els beneficis de treballar a Xm alt són de 10 vegades en termes de SEC i de producció, l'augment de potència és només de l'ordre de 2 vegades la necessària respecte de la Xm baixa.
Viscositat aparent i energia de fluidització
S'estudia la relació entre el temps de desintegració, les forces de fregament i els valors de viscositat aparent de la bibliografia. Per cada paper i velocitat s'ha observat que el consum específic d'energia disminueix en funció de la viscositat aparent.
Reologia del púlper
Utilitzant el mètode de Metzner i Otto (1957) per determinar la viscositat aparent mitjana de les suspensions papereres, modificat per Roustan, s'ha caracteritzat el pulper mitjançant el model: Np= K· Rex·Fry
S'han utilitzat dissolucions de glicerina com a fluid newtonià per a calcular les constants d'ajust, i a partir d'aquí, aïllar la viscositat aparent en funció de la potència neta i els paràmetres d'agitació.
La viscositat aparent, d'acord amb Fabry (1999) es substitueix pel concepte de factor de cisallament.
Factor de cisallament
Calculat el factor de cisallament per a cada paperot i condicions d'agitació, s'ha relacionat amb Xm, SEC, tD, consum de potència, potència instal·lada i fracció cel·lulòsica. El factor de cisallament és un paràmetre útil per a quantificar les forces globals implicades en la desintegració.
Disintegration is an important stage in paper recovery and it has important consequences in energy consumption and in the following stages.
The objectives of this thesis are focussed in analyzing disintegration considering disintegration time, power aspects, modelisation of the disintegration machine and analysis of the calculated shear factors as a global measurement of the forces implied in the disintegration.
Until now, it has only been possible a qualitative evaluation of the influence of every mechanism in the time necessary to disintegrate the pulp, and in the power consumption.
Rheological characteristics of suspensions and their non-Newtonian behaviour it is known that clearly influence power consumption and defibering forces acting during repulping. Disintegration experiments have been made in a conventional pulper, with three types of recovered paper: high quality coated printed offset paper, magazine coated colour printed paper and white laser printed paper.
Analysis of disintegration time
Time necessary to achieve a Somerville index of 0.01%, was determined for each paper studied, at mass fractions ranging from 0,06 until the maximum possible for each type of paper (0,14 or 0,18) and at two different agitation speeds. It has been found that when increasing the mass fraction, disintegration time decreases potentially. Disintegration speed and theoretical production of pulp have been studied in each case, and they have been related with friction and impact forces.
Power aspects
Specific energy consumption (SEC) defined as the energy consumed during disintegration of 1 kg of recovered paper, was reduced with increasing mass fraction (Xm), because the energy consumed during disintegration decreases and the pulp contend in the pulper is higher. And increase of Xm and pulper agitation speed always increases the power consumed. An increase of only 2 times of power consumption (due to working at high Xm) produces benefits in SEC and production of 10 times.
Apparent Viscosity and fluidisation energy
Relation between disintegration time, friction forces and apparent viscosity were studied. For each paper and speed it has been observed that SEC was reduced when increasing apparent viscosity.
Rheology of pulper
Using Metzner and Otto methodology to determine average apparent viscosity of suspensions, modified by Roustan, pulper was characterized by means of model Np=K·Rex·Fry. Glycerine dissolutions have been used as Newtonian fluid to calculate constants of adjustment, and from here, apparent viscosity was determined from net power and agitation parameters. Apparent viscosity, in agreement with Fabry, is replaced by the concept of shear factor.
Shear Factor
Once calculated the shear factor for each type of paper and conditions of agitation, the values obtained have been related to Xm, SEC, td, power consumption, installed power and cellulose fraction. Shear factor is a useful parameter to quantify the global forces acting in disintegration process.
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Barton, Joseph Frank. "Rupture and recuperation : technological traces in digital narrative cinema." Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/3058.
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In this thesis I analyse visual traces of digital technologies in narrative cinema as a way of exploring broader questions about the medium and the cultural status of its technological constituents. In so doing, I not only identify a number of areas of filmmaking that are currently under-researched or overlooked, but move the focus away from the questions of what digitisation means for cinema’s ‘identity’, and towards a consideration of how the implications of digitisation are at once exaggerated in rhetoric and tempered in practice by aesthetic, ideological, and economic factors. To do this, I focus on recent narrative films (1998-2013) in which digital filmmaking technologies are themselves salient features of the cinematic image. I argue that initial appearances of these digital traces are presented and received as disruptive, in that they appear to symbolise both a break with the ontological assumptions of cinema, and the potential to re-imagine the very notion of the medium itself. However, I demonstrate how each of these disruptions are, to differing extents, soon absorbed into the conventional formal structures of narrative cinema, such that their ultimate effect on the medium is to broaden its stylistic palate rather than to radically transform its identity. In so doing, I make four main scholarly contributions. Firstly, I provide an account of digital cinema contextualised in relation to the broader use of digital image technologies over this time period. Secondly, I use the technological trace as a locus for exploring intersections of aesthetic, ideological, and industrial factors in the production of these films. Thirdly, I temper hyperbolic reactions to digitisation by stressing continuities with, and echoes of, the history of analogue narrative cinema. Finally, I demonstrate how digital ontologies are shaped by popular discourses, and how these reinforce, qualify, and in some instances, contest, existing scholarly debate.
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Boyd, Harriet Anne. "Modernising opera recuperation and renewal in Venice, 1951-1961." Thesis, King's College London (University of London), 2014. https://kclpure.kcl.ac.uk/portal/en/theses/modernising-opera-recuperation-and-renewal-in-venice-19511961(ca4e4ce0-1c37-4b56-a45b-b59b2dec5bab).html.
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This thesis explores operatic production in Venice’s nascent postwar culture (1951- 1961). Although long sidelined as a site of political authority, Venice took on new life in the twentieth century, both as a hub of avant-garde activity and as a site of cultural recuperation. I begin with the premiere of Stravinsky’s The Rake’s Progress (1951), an opera that provoked anxieties over memory and cultural heritage in a society trying to efface the past and embrace future-orientated mass media. Echoes of the past in the postwar period reverberate in the second chapter, which is on the revival of Verdi’s Attila (1951). The performance became a focal part of contemporary concerns with posterity: an exhumed classic, a vehicle for rewriting Risorgimento history and a media event. The third chapter focuses on the premiere of three one-act music theatre pieces, commissioned by the 1959 music festival to alleviate widespread calls of opera crisis. Critics perceived the resultant works to be grounded in ideas of openness, diversity and eclecticism—a proto-neoavanguardia distinct from resurgent high modernism. The final chapter takes as its topic the premiere of Luigi Nono’s Intolleranza 1960 (1961). Heralded by some as opera’s salvation, Intolleranza was premised on a noisy realism that served not just as a locus of political memory, but also as a regeneration of older artistic forms in response to the increasing hegemony of new mass entertainments. In sketching these four case studies, I construct a specific picture of opera at midcentury, one forged in the aftermath of war and in response to cultural and technological changes unforeseen in the Fascist period. I want to suggest, furthermore, a fleeting revitalisation of operatic culture, one filtered through a lugubrious rhetoric born of crisis, museography and dangerously beguiling mass media.
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Amini, Azin. "Contractile floating barriers for confinement and recuperation of oil slicks /." Lausanne : EPFL, 2007. http://library.epfl.ch/theses/?nr=3941.
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Thèse Ecole polytechnique fédérale de Lausanne EPFL, no 3941 (2008), Faculté de l'environnement naturel, architectural et construit ENAC, Programme doctoral Environnement, Institut des infrastructures, des ressources et de l'environnement ICARE (Laboratoire de constructions hydrauliques LCH). Dir.: Anton Schleiss.
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Fields, Lisa G. "Effect of humor programs on recuperation time and medication usage." Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1014846.
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The purpose of this study was to determine if using a humor program affected hospital oncology and osteology patients' recuperation times or use of pain medications. A quasi-experimental, retrospective study was designed. Thirty pairs of patients were identified from existing records at a hospital that has a comprehensive humor program. One patient in each pair had used the humor program, the other had not. Chi-square analysis on the demographic variables of race, marital status, smoking status and sex showed no significant association between humor usage and all variables except sex. No correlation was found between patient age and humor program use. Independent t-tests (a = 0.05) were performed on the duration of stay for treatment and control populations, for the oncology and the osteology groups. No statistically significant differences were found in either population. Two independent t-tests (a = 0.05) were performed to analyze pain medication usage. The first examined the differences in the mean percent of p.r.n. pain medications used. Neither population showed statistically significant differences. The second t-tests examined coded scores for changes in pain medication orders. Again, no statistically significant differences were found in either population.Department of Physiology and Health Science
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James, Klemens E. "Non-repressive sublimation and the recuperation of desire in surrealism." Thesis, University of Manchester, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516558.
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Londero, Eduardo Bauer. "Comportamento de Metricas de Inteligibilidade Textual em Documentos Recuperados naWeb." Universidade Catolica de Pelotas, 2011. http://tede.ucpel.edu.br:8080/jspui/handle/tede/220.
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Previous issue date: 2011-03-29Text retrieved from the Internet through Google and Yahoo queries are evaluated using Flesch-Kincaid Grade Level, a simple assessment measure of text readability. This kind of metrics were created to help writers to evaluate their text, and recently in automatic text simplification for undercapable readers. In this work we apply these metrics to documents freely retrieved from the Internet, seeking to find correlations between legibility and relevance acknowledged to then by search engines. The initial premise guiding the comparison between readability and relevance is the statement known as Occam s Principle, or Principle of Economy. This study employs Flesch-Kincaid Grade Level in text documents retrieved from the Internet through search-engines queries and correlate it with the position. It was found a centralist trend in the texts recovered. The centralist tendency mean that the average spacing of groups of files from the average of the category they belong is meaningfull. With this measure is possible to establish a correlation between relevance and legibility, and also, to detect diferences in the way both search engines derive their relevance calculation. A subsequent experiment seeks to determine whether the measure of legibility can be employed to assist him or her choosing a document combined with original search engine ranking and if it is useful as advance information for choice and user navigation. In a final experiment, based on previously obtained knowledge, a comparison between Wikipedia and Britannica encyclopedias by employing the metric of understandability Flesch-Kincaid
Textos recuperados da Internet por interm´edio de consultas ao Google e Yahoo s ao analisados segundo uma m´etrica simples de avaliac¸ ao de inteligibilidade textual. Tais m´etricas foram criadas para orientar a produc¸ ao textual e recentemente tamb´em foram empregadas em simplificadores textuais autom´aticos experimentais para leitores inexperientes. Nesse trabalho aplicam-se essas m´etricas a texto originais livres, recuperados da Internet, para buscar correlacionar o grau de inteligibilidade textual com a relev ancia que lhes ´e conferida pelos buscadores utilizados. A premissa inicial a estimular a comparac¸ ao entre inteligibilidade e relev ancia ´e o enunciado conhecido como Princ´ıpio de Occam, ou princ´ıpio da economia. Observa-se uma tend encia centralista que ocorre a partir do pequeno afastamento m´edio dos grupos de arquivos melhor colocados no ranking em relac¸ ao `a m´edia da categoria a que pertencem. ´E com a medida do afastamento m´edio que se consegue verificar correlac¸ ao com a posic¸ ao do arquivo no ranking e ´e tamb´em com essa medida que se consegue registrar diferenc¸as entre o m´etodo de calcular a relev ancia do Google e do Yahoo. Um experimento que decorre do primeiro estudo procura determinar se a medida de inteligibilidade pode ser empregada para auxiliar o usu´ario da Internet a escolher arquivos mais simples ou se a sua indicac¸ ao junto `a listagem de links recuperados ´e ´util e informativa para a escolha e navegac¸ ao do usu´ario. Em um experimento final, embasado no conhecimento previamente obtido, s ao comparadas as enciclop´edias Brit anica eWikip´edia por meio do emprego da m´etrica de inteligibilidade Flesch-Kincaid Grade Level
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Cunha, Andrielle Thainar Mendes. "Características estruturais e funcionais de espermatozoides bovinos recuperados do epidídimo." reponame:Repositório Institucional da UnB, 2015. http://dx.doi.org/10.26512/2015.02.D.18354.
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Dissertação (mestrado)—Universidade de Brasília, Faculdade de Agronomia e Medicina Veterinária, 2015.Submitted by Guimaraes Jacqueline (jacqueline.guimaraes@bce.unb.br) on 2015-06-15T14:23:55Z No. of bitstreams: 1 2015_AndrielleThainarMendesCunha.pdf: 1263718 bytes, checksum: d3e361eee393e655519a6623e0bb6ce0 (MD5)
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A utilização de espermatozoides do epidídimo (EP) em técnicas de reprodução assistida tem um papel importante na multiplicação e armazenamento de material genético. Entretanto, melhor conhecimento sobre o comportamento fisiológico destes espermatozoides é necessário para otimizar a sua utilização. Objetivou-se avaliar a viabilidade, resistência e longevidade de EP de sete touros da raça Gir, durante e após a criopreservação, usando os espermatozoides do ejaculado (EJ) como controle. O ejaculado foi coletado através de eletroestimulação, posteriormente os animais foram castrados e os espermatozoides da cauda do epidídimo foram coletados pelo método de extravasamento. Primeiramente, verificou-se a resistência dos EJ e EP diante à criopreservação, as células foram avaliadas logo após a recuperação, após quatro horas de refrigeração e após o descongelamento. Em uma segundo etapa, foi avaliada a longevidade após a criopreservação. Foram utilizados três grupos de espermatozoides do EJ, do EP e um grupo em que EP foram incubados com plasma seminal (EPP). Após o descongelamento amostras dos três grupos foram incubadas por zero, três, seis e 24 horas. Em cada momento foi avaliada a motilidade total e progressiva, integridade de membrana plasmática, integridade acrossomal, morfologia espermática capacitação. Finalmente foi avaliada a capacidade dos espermatozoides do epidídimo de se ligarem às células da tuba uterina (CTU). Para isso foram utilizados os grupos EJ, EP e EPP, foram co-incubados, com CTU por zero, três, seis e 24 horas. Devido ao resultado obtido, um segundo teste foi realizado utilizando testículos de quatro touros, coletados em abatedouro. Um testículo de cada animal foi utilizado para o grupo de EP criopreservado (EP-C) e o outro para o grupo de EP fresco (EP-F). Os dados foram analisados usando procedimento GLIMMIX do programa SAS (P≤0,05). Os EP apresentaram características de qualidade semelhantes aos do EJ frescos e após a criopreservação (P>0,05). Entretanto, foram mais resistentes à refrigeração do que os do EJ, apresentado maior MT (79,8±4,5 e 56,8±5,6), maior MP (46,1±3,5 e 29,2±3,2) e maior porcentagem de acrossoma íntegro (68,7±5,8 e 48,5±6,1). Após o descongelamento, e 6h de incubação os grupos EP e EPP comparados com o EJ apresentaram maior porcentagem de membrana plasmática íntegra (29±4,3, 28,2±4,2 e 16,4±3,4), maior porcentagem de espermatozoides com acrossoma intacto (31,6±3,8, 31,6±3,8 e 19,9±3,2) e maior porcentagem de espermatozoides não capacitados (81±3,5, 80,9±3,5 e 70,3±3,7). O número de espermatozoides ligados após a co-incubação das CTU com EJ, EP ou EPP não diferiu (P>0,05) em nenhum grupo, a análise dentro de cada grupo mostrou que ambos apresentaram queda gradativa no número de espermatozoides ligados às CTU, sendo que o menor número foi observado às 24 h para todos os grupos. No segundo teste de ligação, o grupo EP-F apresentou maior numero de células ligadas aos 30 min (130,9±21,2) e às 24 horas (131,7±21,2) de incubação do que o grupo EP-C aos 30 min (88±21,2) e 24 h (20,4±21,2). Pode-se concluir que EP são mais resistentes à refrigeração dos que os do EJ, apresentam maior longevidade e características de capacitação tardia, quando comparados ao EJ. Além disso, os EP se ligam às CTU da mesma forma que os EJ, no entanto a criopreservação pode afetar esta ligação.
The use of epididymal sperm (ES) in assisted reproductive technologies is an important tool form multiplication and conservation of genetic material. However, a better understanding of several aspects of those sperm physiology is needed to optimize its use. The aim of this study was to evaluate the strength, the post thawed viability, longevity and sperm characteristics behavior of ES from 7 Gir bulls, during and after cryopreservation, using ejaculated sperm (EJ) as a control. After ejaculated sperm was collected the testis were removed and sperm from the cauda epididymis were recovered First we evaluate the resistance of ES and EJ to cryopreservation, sperm were evaluated just after recovering, after 4 h of cooling and after freezing. Then, we evaluate the post thawing longevity by examining the sperm after different periods of incubation. Three groups were used ES, EJ, and a third group, in which ES was incubated with seminal plasm for 10 min after thawed (ESS). After thawing, samples from the 3 groups were incubated for 0, 3, 6 e 24 h. In each moment they were evaluated for total motility and progressive motility, plasm membrane integrity. acrosome integrity, morphology and capacitation. Finally, we evaluated the ability of ES, EJ and ESS to bind to oviduct epithelium cells (OEC), Samples from EJ, EP e EPP groups were co-incubated with OEC for 0, 3, 6 e 24 h. Due to the results obtained, another test had to be done to evaluated if the cryopreservation process was affecting ES binding. To do that we used testis form 4 bulls collected at slaughter house. From each animal one testis was used for the fresh sperm (ES-F) and the other for the frozen sperm (EP-C). Data analysis was performed using GLIMMIX from SAS (P≤0.05). Fresh and cryopreserved ES presented all quality parameters similar (P>0.05) to the EJ However, after cooling at 4°C, ES showed to be more resistance to cold than the EJ presenting greater TM (79.8±4.5 and 56.8±5.6), greater PM (46.1±3.5 and 29.2±3.2) and higher percentage of cells with intact acrosome (68.7±5.8 and 48.5±6.1) than EJ. After thawed at 6 h of incubation ES and ESS compared to EJ had a higher percentage of intact membranes (29±4.3, 28.2±4.2 and 16.4±3.4), higher percentage of cells with intact acrosome (31.6±3.8 31.6±3.8 and 19.9±3.2) and higher percentage of non-capacitated sperm (81±3.5, 80.9±3.5 and 70.3±3.7). The number of bounded sperm after co-incubation with OEC was similar (P>0.05) for EJ, ES and ESS groups. The analysis within the group showed that all had a decreased on the number of bounded sperm, with the lowest number of bounded sperm found at 24 h of incubation. In the second biding test the group EF had a higher number of bounded sperm at 30 min (130.9±21.2) and at 24 h (131.7±21.2) of incubation than the EC (30 min=88±21.2 and 24 h=20.4±21.2). It can be concluded that ES are more resistant to cooling than the EJ, presenting a greater longevity and a delay on capacitation process than the EJ. In addition, ES binds to OEC similarly to EJ; however cryopreservation can affect that binding.
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Qu, Shaoyang, David Fassbender, Andrea Vacca, Enrique Busquets, and Uwe Neumann. "A closed circuit electro-hydraulic actuator with energy recuperation capability." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71077.
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The recent electrification trend in the off-road market has incentivized research towards the proposal of compact, cost-effective and energy-efficient solutions for hydraulic actuators. As a result, increased attention has been given to electro-hydraulic actuator (EHA) architectures. The paper offers a study performed on a novel closed-circuit EHA architecture with the goal to maximize the overall system efficiency while meeting or exceeding traditional off-road applications performance, thereby enabling further electrification of off-road applications. Both numerical and experimental approaches are utilized to validate the functionality of the proposed EHA circuital configuration in four quadrants. Moreover, the actuator functionality at both high and low velocities are considered, which has never been explored in the past due to the limitations on the hydraulic machine driving speed. The good match between the experimental data and the simulation results confirms the potential of the simulation model for sizing such EHA architecture for different actuator sizes, duty cycles, and performance levels.
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Letellier, Marie-Christine. "Recuperation et dosage des phases argileuses d'un sable de gisement." Toulouse 3, 1986. http://www.theses.fr/1986TOU30220.
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Methode de dosage des argiles dans un sable a partir de la determination par rayons x des teneurs en quartz. Les resultats obtenus par les differentes methodes classiques et par la methode proposee sont ensuite compares a ceux qui sont donnes par traitement statistique des analyses chimiques realisees a la microsonde electronique
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Bravo, Leiton Maximiliano. "¿Cómo recuperar la confianza en la regla fiscal chilena?" Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/146421.
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Seminario para optar al título de Ingeniero Comercial, Mención EconomíaDesde su implementación en el año 2001, la regla ha ido perdiendo eficacia y credibilidad con el paso de los años. Aunque en un principio, en el periodo que abarca entre 2001 y 2005, la regla sigue manteniendo un efecto significativo a la hora de guiar la política fiscal del país, entregando una credibilidad tal que las principales agencias clasificadoras de riesgo catalogaron a Chile como un país con una fuerte capacidad para cumplir con sus compromisos financieros, cada año que pasa la regla ha ido sufriendo una pérdida de sus propiedades, y con ello de los beneficios que su aplicación implica. La mayor complejidad que fue adquiriendo el proceso de estimación volvió difícil su replicabilidad, y los constantes cambios en las metas de balance estructural mermaron su transparencia. Estos, sumados a problemas técnicos en la estimación de las variables relevantes, el PIB tendencial y el precio de referencia del cobre, han sido factores decisivos en la pérdida de confianza que ha experimentado la regla en los últimos años, ya registrada por las agencias clasificadores que en la actualidad catalogan a Chile como un país más vulnerable a posibles condiciones económicas adversas. Este trabajo en primera instancia investiga, mediante una revisión de la literatura, las conveniencias de contar con una regla fiscal, y los aspectos a tener en cuenta al momento de introducirle modificaciones. Luego, se abordan las principales razones que llevaron a la pérdida de confianza en la regla fiscal de nuestro país, para, a través de una revisión histórica de la evolución de la regla en Chile, determinar cuáles son los apartados que han fallado en los últimos años y han generado la pérdida de confianza. Luego, una vez corroborado el estado actual de la regla, el presente trabajo se dispone a presentar propuestas que entreguen una solución, ya sea parcial o total, a los problemas existentes. Para ello, se proyectan los resultados que derivan de los cambios metodológicos propuestos, y se comparan con las estimaciones originales, tomando como referencia el cierre del año 2016. El ejercicio muestra que es posible aumentar la transparencia y simplicidad del proceso de estimación sin la necesidad de alterar drásticamente las estimaciones de los ingresos y del balance estructural. Por ejemplo, el uso de una elasticidad unificada para los ingresos tributarios no mineros directos proyecta un déficit del balance estructural equivalente a un 0,96% del PIB para el año 2016, en comparación con el déficit del 1,1% del PIB que genera la estimación original. Cuando se combinan los resultados de las distintas propuestas metodológicas, y se incluyen además los cambios asociados a la precisión de la estimación de las variables relevantes, se proyecta un déficit del balance estructural del orden del 0,67% del PIB, en contraste con el déficit del 1,1% del PIB que estima la metodología original. La efectividad en la aplicación de las nuevas propuestas dependerá de la evolución de la institucionalidad fiscal, y de que organismos como el Consejo Fiscal Asesor tengan la capacidad de monitorear y participar en mayor medida en el proceso de estimación
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Aguilar, Nandayapa Mario Artemio. "El Estridentismo recuperado: Movimiento literario de vanguardia mexicano (1921-1928)." Tesis, Universidad de Chile, 2007. http://www.repositorio.uchile.cl/handle/2250/108975.
Full textAbstract:
La presente tesis está circunscrita al Estridentismo, que fue un movimiento literario y artístico de vanguardia, que se sitúa, en cuanto a su periodo de mayor acción y producción, en un espacio con nombre de tiempo: los años veinte del siglo xx mexicano. A través de un análisis que comprende manifiestos y obra emitida en el periodo de 1921-1928 (en la introducción general y en el apartado de la biblio-hemerografía de los Estridentistas, ofrezco datos en detalle); se efectúa un análisis de sus distintas descripciones, y las maneras de cómo se construye un periodo histórico en la historiografía donde se muestran los alcances de las distintas recepciones que ha tenido el Estridentismo: las que se cierran sobre la lectura y ciegan los horizontes en función de intereses ajenos a la crítica literaria, y las que, al contrario, abren las perspectivas hacia los horizontes culturales, hacia las expectativas de las lecturas.
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SOUSA, Ricardo Aurélio Fragoso de. "Um modelo teórico-experimental de recuperador do calor sensível contido nos gases da descarga de uma microturbina." Universidade Federal de Pernambuco, 2005. https://repositorio.ufpe.br/handle/123456789/5623.
Full textAbstract:
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Previous issue date: 2005No presente trabalho foi desenvolvido um modelo teórico-experimental para determinação do desempenho de um recuperador do calor sensível contido no gás de combustão originado de uma microturbina. A parte experimental foi realizada na planta COGENCASA da UFPE, onde uma microturbina, fabricação CAPSTONE, de 30 kW de potência de pico, consome gás natural e fornece energia elétrica. Os gases de combustão, após saírem da turbina, passam por um recuperador de calor, onde parte do calor sensível é transferido para a água no recuperador de calor. O recuperador de calor é um trocador de calor compacto. Através de medidores de temperatura (termopares) e medidores de vazão foi possível a obtenção do desempenho do recuperador de calor. A parte teórica foi desenvolvida através do balanço de massa e energia no trocador de calor tendo sido elaborado um programa em MATLAB, que determinou o valor da energia térmica cedida pelos gases de combustão e o valor da energia térmica recebida pela água. Realizou-se, então, uma comparação entre os valores encontrados na parte experimental e os valores indicados em catálogos de um recuperador de calor, similar ao que é objeto do estudo. Concluiu-se, por fim, que os valores obtidos através do programa desenvolvido estavam similares aos valores indicados pelo fabricante do trocador
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Yoo, Sam Hyun. "Postponement and recuperation in cohort marriage: The experience of South Korea." Max Planck Institute for Demographic Research, 2016. http://dx.doi.org/10.4054/DemRes.2016.35.35.
Full textAbstract:
Background: Despite continuing marriage delay in East Asia, little is known about the shift of marriage towards later ages and the concomitant decline in marriage.
Objective: Applying the concept of cohort postponement and recuperation to marriage in South Korea, I study the pattern of marriage delay among women and the extent to which delayed marriages are realized later in life.
Methods: With Korean census 1% samples microdata, I compare women's marriage schedules across five-year birth cohorts born between 1916 and 1985 and analyze the trend in marriage delay and subsequent recovery at higher ages.
Results: Two distinct patterns of marriage delay can be identified. The first one occurred among the birth cohorts born in the 1930s and early 1940s, who faced successive political upheavals such as World War II and the Korean War. A different pattern of marriage delay is underway among the women born since the 1970s, among whom the proportion of the never-married by age 45 has begun to increase. These two patterns changed with level of education: The wars delayed marriage in a similar way for all social groups, whereas the recent marriage delay is more pronounced among women with tertiary education.
Conclusions: The extent to which marriage delay is compensated at later ages differed across cohorts and social groups. Given the recent trend, the proportion of ever-married women by age 45 is expected to decline considerably among the younger cohorts born since the late 1970s, bringing an end to the universal marriage pattern in South Korea.
Contribution: This study highlights the transition of marriage timing in South Korea, which experienced rapid socioeconomic changes, which differs significantly from the European experience.
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Silva, Isaac Alexander. "Onboard Hydrogen Generation for a Spark Ignition Engine via Thermochemical Recuperation." Thesis, University of California, Davis, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1585124.
Full textAbstract:
A method of exhaust heat recovery from a spark-ignition internal combustion engine was explored, utilizing a steam reforming thermochemical reactor to produce a hydrogen-rich effluent, which was then consumed in the engine. The effects of hydrogen in the combustion process have been studied extensively, and it has been shown that an extension of the lean stability limit is possible through hydrogen enrichment. The system efficiency and the extension of the operational range of an internal combustion engine were explored through the use of a methane fueled naturally aspirated single cylinder engine co-fueled with syngas produced with an on board methane steam reformer. It was demonstrated that an extension of the lean stability limit is possible using this system.
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SOLIGNAC, FRANCK. "Contribution a l'etude de la recuperation du petrole par injection d'air." Paris 6, 1996. http://www.theses.fr/1996PA066393.
Full textAbstract:
L'etude des reactions d'oxydation des huiles legeres a ete entreprise afin de mieux comprendre les mecanismes reactionnels mis en jeu lors de la combustion in situ au cours d'une recuperation assistee par injection d'air. Nous avons axe notre etude principalement sur les variations de temperature engendrees par les reactions exothermiques, sur la consommation de l'oxygene et sur la production des oxydes de carbone. Pour cela nous avons utilise: ? deux systemes experimentaux fermes: un calorimetre adiabatique et un thermogravimetre isotherme. ? deux systemes experimentaux ouverts: de l'air a ete injecte a pression constante dans des carottes contenant initialement de l'huile. Ces experiences ont ete realisees en mode isotherme et en mode pseudo-adiabatique. A la suite de cette etude nous avons etabli un schema reactionnel assez general permettant de rendre compte en grande partie des phenomenes observes. Il en resulte que: - le coefficient negatif de temperature separe la phase lto de la phase hto. - en phase hto le fuel est constitue de composes polaires et de coke formes en phase lto
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Kleut, Petar. "Recuperation of the exhaust gases energy using a Brayton cycle machine." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/76807.
Full textAbstract:
Lately, car manufacturers have been put to a big challenge to reduce the CO2 emission of their entire fleets. Norms of pollutant emissions limit the ways to achieve the desired CO2 emission goals, as some of the solutions that would lead to lower CO2 emission also lead to higher pollutant emission. Waste Heat Recovery (WHR) could be a good solution to lower the CO2 emission of the Internal Combustion Engine (ICE) without increasing the pollutant emission. In the present thesis different WHR strategies are analysed and the results suggested it would be interesting to further study the Brayton cycle machine.
Air Brayton Cycle (ABC) represents a way to recover a part of the heat energy of the ICE exhaust gases and transform it into mechanical energy. Recovered mechanical energy would then be returned to the crankshaft of the ICE, thereby reducing the amount of energy that has to be liberated by combustion of fuel which lowers the fuel consumption and CO2 emission.
The study of ABC started with an analysis of the ideal cycle in order to obtain the theoretical maximum of the system. The study continued with an analysis of the semi ideal cycle where all losses are taken into account only by two efficiency coefficients. This analysis showed that for the diesel engine efficiency of the ABC is very low because of the low exhaust gas temperature. For the gasoline engine the cycle could be viable when the ICE is working under steady condition and higher load. These conditions could be fulfilled when the vehicle is driven on the highway.
Detailed analysis was aimed at determining the cycle main losses. They were determined to be: pumping losses, losses caused by heat transfer and mechanical losses. Taking into account these main losses along with other direct and indirect losses it was concluded that the cycle is not viable for the types of the WHR machines that were considered in this study.
In order for the cycle to be viable some other either existing or new machine type should be tested, that would lower the main losses and offer good isentropic and mechanical efficiency for desired conditions.Últimamente los fabricantes de automóviles se han puesto el gran reto de reducir la emisión de CO2 en la totalidad de sus flotas. Las nuevas normativas para la reducción de las emisiones contaminantes limitan los medios para lograr los objetivos deseados en la emisión de CO2 porque algunas de las soluciones que llevan a la reducción en la emisión de CO2 también dan lugar a un incremento en la emisión de otros contaminantes. La recuperación de calor residual (WHR) podría ser una buena solución para reducir las emisiones de CO2 del motor de combustión interna (ICE) sin poner en peligro la emisión de contaminantes. En la presente Tesis se analizaron diferentes estrategias de WHR y se concluyó que sería interesante estudiar más a fondo la máquina de ciclo Brayton. El Ciclo Brayton de Aire (ABC) permite recuperar una parte del calor de los gases de escape del ICE y transformar este calor en energía mecánica. La energía mecánica recuperada se devuelve al cigüeñal del ICE, reduciendo de ese modo la cantidad de energía que tiene que ser liberada por la combustión del combustible, lo cual permite reducir el consumo de combustible y las emisiones de CO2. En esta Tesis se estudia el ABC mediante un análisis del ciclo ideal con el fin de obtener el máximo teórico del sistema. El modelo se mejora con un análisis del ciclo semi-ideal donde se tienen en cuenta todas las pérdidas mediante el uso de dos coeficientes generales. Este análisis muestra que para el motor diesel la eficiencia del ciclo ABC es muy baja debido a la baja temperatura del gas de escape. Para el motor de gasolina el ciclo podría ser viable cuando el ICE está trabajando bajo condiciones estacionarias y una carga mayor. Estas condiciones se podrían cumplir cuando el vehículo está circulando en autopista. El análisis detallado de este ciclo tiene como objetivo determinar las pérdidas principales de ciclo. Las pérdidas principales se identificaron como: las pérdidas de bombeo, las pérdidas causadas por la transferencia de calor y las pérdidas mecánicas. Teniendo en cuenta estas pérdidas principales junto con otras pérdidas directas e indirectas, se concluyó que el ciclo no es viable para los tipos de máquinas WHR que fueron considerados en este estudio. Para que el ciclo sea viable se tiene que buscar alguna otra máquina existente o un nuevo tipo de máquina que reduzca las principales pérdidas y ofrezca un buen rendimiento isentrópico y mecánico para las condiciones deseadas.
Últimament els fabricants d'automòbils s'han posat el gran repte de reduir l'emissió de CO2 de la totalitat de les seues flotes. Les noves normatives de reducció de les emissions contaminants limiten els mitjans per assolir els objectius desitjats d'emissió de CO2 perquè algunes de les solucions que porten a la reducció en l'emissió de CO2 també donen lloc a un increment a l'emissió de altres contaminants. La recuperació de calor residual (WHR) podria ser una bona solució per reduir les emissions de CO2 del motor de combustió interna (ICE) sense posar en perill l'emissió de contaminants. En la present Tesi s'han analitzat diferents estratègies WHR i es va concloure que seria interessant estudiar més a fons el cicle Brayton. El Cicle Brayton d'Aire (ABC) representa una manera de recuperar una part de la calor dels gasos d'escapament de l'ICE i transformar calor a l'energia mecànica. L'energia mecànica recuperada es retorna al cigonyal de l'ICE reduint d'aquesta manera la quantitat d'energia que ha de ser alliberada per la combustió del combustible permitint la reducció del consum de combustible i les emissions de CO2. En aquesta Tesi s'ha començat estudiant un ABC amb una anàlisi del cicle ideal per tal d'obtenir el màxim teòric del sistema. Este model es millora amb una anàlisi del cicle semiideal on es tenen en compte totes les pèrdues amb tan sols dos coeficients d'eficiència. Aquesta anàlisi va mostrar que per al motor dièsel l'eficiència del cicle ABC és molt baixa a causa de la baixa temperatura del gas d'escapament. Per al motor de gasolina el cicle podria ser viable quan l'ICE està treballant sota condicions estacionàries i una càrrega més gran. Aquestes condicions es podrien complir quan el vehicle està circulant en autopista. L'anàlisi detallada del cicle va tenir com a objectiu determinar les pèrdues principals de cicle. Les pèrdues principals es van identificar com: les pèrdues de bombament, les pèrdues causades per la transferència de calor i les pèrdues mecàniques. Tenint en compte aquestes pèrdues principals juntament amb altres pèrdues directes i indirectes, es va concloure que el cicle no és viable per als tipus de màquines WHR que van ser considerats en aquest estudi. Perquè el cicle puga ser viable s'ha de buscar alguna altra màquina existent o un nou tipus de màquina que puga reduir les principals pèrdues i puga oferir un bon rendiment isentròpic i mecànic per a les condicions desitjades.
Kleut, P. (2016). Recuperation of the exhaust gases energy using a Brayton cycle machine [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/76807
TESIS
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Whellens, Matthew W. "Multidisciplinary optimisation of aero-engines using genetic algorithms and preliminary design tools." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/10510.
Full textAbstract:
This study investigates a novel methodology for the preliminary design of aeroengines.
This involves the modelling of the disciplines that affect the engine's requirements
and constraints, their implementation in software format and their coupling into a single
unit. Subsequently, this unit is interfaced with an optimiser software. The resulting
multidisciplinary optimisation (MDO) tool allows the automation of the traditional,
human-based preliminary design process.
The investigation of the above-mentioned novel methodology is carried out
through the development of a "pilot" MDO tool and its subsequent utilisation in three case
studies, characterised by different optimisation scenarios. The selection of each case study
is motivated by current research questions, such as aviation's contribution to climate
change or the attractiveness of specific novel propulsion concepts.
The outcome of the pilot MDO study is considered successful and has been well
received by several academic and industrial aero-engine organisations. The choice of the
disciplines and of their modelling fidelity allowed a realistic representation of the main
disciplinary interactions and tradeoffs that characterise the important phase of preliminary
design. The computational effort involved in the solution of the optimisation studies was
found to be acceptable, and no major reprogramming was required when different
optimisation scenarios were considered. The case studies were investigated with an ease
and comprehensiveness that would not have been achievable through a human-based
parametric analysis.
The positive experience with the pilot MDO tool suggests that an automated
methodology for the preliminary design of aero-engines is feasible, applicable and valuable.
Its adoption can provide substantial advantages over the traditional human-based
approach, such as a reduction in human effort, costs and risk. From this perspective, the
pilot study constitutes a first step towards the development of a full-scale MDO tooL
usable by aero-engine manufacturers. In the near future, issues like climate change could
drive significant modifications in airframe and engine design. A preliminary design MDO
tool is therefore timely, and has the potential of making a significant contribution.
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Arias, Fernández Alejandro José. "Estudio de materiales compuestos de cuero recuperado aglomerados con resina polimérica." Bachelor's thesis, Pontificia Universidad Católica del Perú, 2013. http://tesis.pucp.edu.pe/repositorio/handle/123456789/5327.
Full textAbstract:
Actualmente la producción de calzados de cuero es una actividad económica que crece
principalmente al ritmo de la población de las grandes ciudades. En distintas etapas de la
producción del calzado se realiza el corte del cuero y como producto de este proceso se
obtienen grandes cantidades de mermas no utilizadas en la confección del calzado; éstas
representan un 4% del total del cuero utilizado, los cuales normalmente son desechados
incrementando el volumen de los residuos sólidos y, con ello, los problemas
medioambientales. Entre las soluciones a este problema se plantea el recuperado de los
residuos de cuero con el propósito de agregar valor a la cadena de producción del
calzado; así, por ejemplo, producir a partir de estos residuos un material capaz de ser
utilizado como suela falsa de botas de seguridad industriales.
El objetivo de este trabajo es el estudio de las propiedades de los materiales compuestos
de cuero recuperado aglomerados con resina polimérica.
Con este propósito, se ha desarrollado este trabajo según las siguientes etapas: en
primer lugar, se estudian los fundamentos teóricos relacionados con los materiales
compuestos y procesos existentes que involucren residuos de cuero; seguidamente, se
estableció la metodología experimental a seguir para la fabricación del material
compuesto de cuero y resina polimérica, verificando mediante ensayos el proceso más
adecuado para la obtención de las diferentes mezclas a evaluar y, finalmente, se
fabricaron las muestras según el diseño experimental que considera la variación de la
composición de las mezclas y del tamaño de partículas de cuero y se realizaron los
distintos ensayos para determinar el material compuesto que posea las mejores
propiedades mecánicas y otras físicas.
Finalmente, se ha determinado un proceso de fabricación para la obtención de materiales
compuestos de cuero recuperado aglomerados con resina poliéster; identificando las
variables involucradas en las etapas de este proceso: Preparación del cuero y la resina,
mezcla de los constituyentes, curado y prensado a temperatura ambiente y curado en
horno. Asimismo, se determinaron las propiedades mecánicas de los materiales
compuestos resultantes y además la densidad y absorción de agua de los mismos.Tesis
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Semenzin, Marco. "Pratiche cooperative. Uno studio sulle imprese recuperate in Italia e Argentina." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424716.
Full textAbstract:
This research takes into considerations two cases, one of them in Italy and one in Argentina, of productive organizations self-managed by male and female workers defined “recovered enterprises”. The research investigates whether and how the critical event of the economic failure and the take over by the workers generate, in the studied enterprises, a modification of the overall organizational set-up, a redefinition of the organizational cultures and a reshaping of the working practices, bringing out elements of discontinuity and differences compared with the forms of labor organization typical of the capitalistic enterprises.
Employing the tools of the ethnographic method, i.e. the participant observation and the discursive interview, the research analyzes some specific aspects of the organization: the relationship between the organization and the environment; the organizational structure and the process of production; the working relations and ultimately the social relations. In these specific fields, the attention has been focused on the processes of transformation and the forms of institutionalization, on gender relations, on power and lastly on the organizational routines performed by the social actors.
In both the case-studies there is the presence of an ongoing tension that, on the one hand, favored the emergence of new spaces of freedom in the management of labor practices, spaces of participation and decision. On the other hand, it is possible to notice that the market pressure contributes to maintain some of the characteristics who were pivotal in the previous model of organization, habitus and organizational routines.
This tension underlies both a series of cleavages and recompositions of the social organizational order, and sometimes of its redefinition in some specific fields. In particular, social innovations are mainly visible in the everyday working practices that allow the spread of elements of self-management. The forms of self-management developed in the recovered enterprises clash with the economic rationality typical of the capitalistic productive organizations. For what concerns social relationships, it is possible to notice the presence of informality, mutualism and selfish and uncooperative behaviors, as well as an increase, albeit inhomogeneous, in the political subjectivity. In particular, in the recovered enterprises it is pivotal the role played by the female workers in the development of both informal relations and conflicting practices.La ricerca prende in esame due casi, uno in Italia e uno in Argentina, di organizzazioni produttive autogestite da lavoratori e lavoratrici denominate “imprese recuperate”. La ricerca indaga se e come l'evento critico del fallimento economico e il recupero da parte dei lavoratori produca nelle imprese studiate una modificazione dell'assetto organizzativo generale, una ridefinizione delle culture organizzative e delle pratiche lavorative facendo emergere elementi di discontinuità e differenza rispetto a forme di organizzazione del lavoro tipiche delle imprese capitaliste. Mediante gli strumenti propri del metodo etnografico, l'osservazione partecipante e l'intervista discorsiva, la ricerca analizza alcuni ambiti specifici dell'organizzazione: il rapporto tra organizzazione e ambiente; la struttura organizzativa e il processo di produzione; i rapporti lavorativi e infine i rapporti sociali. In questi ambiti specifici l'attenzione si è focalizzata sui processi di mutamento e sulle forme di istituzionalizzazione, sui rapporti di genere, sul potere e infine sulle routine organizzative utilizzate dagli attori sociali. In entrambi i casi studiati vi è la presenza di una tensione continua che vede da un lato l'emergere di nuovi spazi di libertà nella gestione delle pratiche di lavoro, di partecipazione, e di decisione dall'altro lato si nota come la pressione del mercato contribuisca a mantenere alcune caratteristiche fondamentali del precedente modello di organizzazione, di habitus e di routine organizzative. Tale tensione è alla base sia di una serie di rotture e ricomposizioni dell'ordine sociale organizzativo sia talvolta di una sua ridefinizione in specifici ambiti. In particolare le innovazioni sociali sono visibili soprattutto nelle pratiche lavorative quotidiane che permettono il diffondersi di elementi di autogestione. Le forme di autogestione sviluppate nelle imprese recuperate contrastano con la razionalità economica di un'organizzazione produttiva di tipo capitalista. Sul versante dei rapporti sociali si nota la compresenza di informalità, mutualismo e comportamenti egoistici e non cooperativi oltre a un aumento, seppur disomogeneo, della soggettività politica. In particolare, nelle imprese recuperate è significativo il ruolo delle lavoratrici nello sviluppo sia di relazioni informali sia di pratiche conflittuali.
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Monteiro, Gabriel Augusto [UNESP]. "Criopreservação e fertilidade de espermatozóides recuperados da cauda do epidídimo de garanhões." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/98278.
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A recuperação de espermatozóides da cauda do epidídimo e sua criopreservação pode ser a última chance para recuperação do material genético quando ocorre morte súbita ou lesão grave em garanhões de alto valor genético. Sendo assim, o objetivo do experimento I foi comparar os parâmetros espermáticos dos espermatozóides da cauda do epidídimo recuperados imediatamente após orquiectomia e em diferentes momentos após armazenamento a 5°C e a temperatura ambiente. Já o experimento II, teve o objetivo de comparar os parâmetros espermáticos e fertilidade dos espermatozóides do ejaculado e do epidídimo recuperados logo depois da orquiectomia e após armazenamento por 24 horas a 5°C. No experimento I, 48 garanhões foram submetidos à orquiectomia bilateral, sendo que em oito a colheita dos espermatozóides do epidídimo foi realizada imediatamente após orquiectomia (grupo controle). Nos outros 40 garanhões, um epidídimo foi armazenado a temperatura ambiente e o contralateral armazenado a 5°C por 6, 12, 18, 24 e 30 horas, de acordo com o grupo. No experimento II, dois ejaculados de oito garanhões foram colhidos com vagina artificial e congelados (grupo EJ-0h). Uma semana após, os garanhões foram submetidos à orquiectomia bilateral, sendo que os espermatozóides de um epidídimo foram congelados imediatamente após orquiectomia (grupo EP-0h) e o epidídimo contralateral foi previamente armazenado por 24 horas a 5°C (EP-24h). O teste de fertilidade demonstrou que o grupo EP-0h (92,3%; n=13) tendem a ser maior que os grupos EJ-0h (61,5%; n=13) e EP-24h (61,5%; n=13). Conclui-se que o armazenamento dos testículos-epidídimos a 5°C proporcionou melhor preservação espermática e que, independente da temperatura, a motilidade progressiva é o parâmetro espermático mais sensível ao tempo de armazenamento.
Cauda epididymis sperm recovery and cryopreservation may be the last chance to obtain genetical material when sudden death or serious injury occur in valuable stallions. Thus, the aim of experiment I was to compare sperm parameters of epididymal sperm recovered immediately after orchiectomy and at different moments after storage at 5°C and at room temperature. Experiment II aimed to compare sperm parameters and fertility of ejaculated sperm and epididymal sperm recovered immediately after orchiectomy and after storage for 24h at 5°C. In experiment I, 48 stallions were submitted to bilateral orchiectomy, in eight of those the sperm collection were done immediately after orchiectomy (control group). In the other 40 stallions, one epididymis was stored at room temperature and the other was stored at 5°C for 6, 12, 18, 24 and 30 hours accorded to groups. In experiment II, two ejaculated from eight stallions were obtained with artificial vagina and cryopreserved (group EJ-0h). One week later, the stallions were submitted to bilateral orchiectomy, and the sperm of one epididymal were frozen immediately after orchiectomy (group EP-0h) and the contralateral epididymal was previously storage for 24h at 5°C (EP-24h). Fertility test showed that group EP-0h (92,3%; n=13) tended to be higher than groups EJ-0h (61,5%; n=13) and EP-24h (61,5%; n=13). These results allowed concluding that storage of the testis-epididymis complex at 5°C is more efficient in preserving sperm parameters than room temperature storage and that progressive motility is the parameter that is more affected by storage period, regardless of the temperature.
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Watt, K. Jane. "Passing out of memory, Georgina Sime and the politics of literary recuperation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21651.pdf.
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Jones, Gareth David. "Rites of recuperation : film and the Holocaust in Germany and the Balkans." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609628.
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Gobatto, Claudio Alexandre 1964. "Alterações metabolicas decorrentes do treinamento fisico em ratos previamente desnutridos e recuperados." [s.n.], 1993. http://repositorio.unicamp.br/jspui/handle/REPOSIP/314547.
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Orientador: Maria Alice Rostom de MelloDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia
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Resumo: A proposta central deste estudo foi a de observar alguns efeitos do treinamento físico em ratos anteriormente desnutridos e recuperados. Para isso, foram analisados parâmetros como ganho de peso corporal, eficiência alimentar, ingestão relativa e determinações bioquímicas, incluindo variáveis plasmáticas como glicose, ácidos graxos dietas a 25% (C) e 6% (D) de proteína por cinco semanas; um protocolo de recuperação nutricional, no qual os animais anteriormente tratados com dieta a 6% de proteína passaram a receber 25% (R); e um programa de treinamento físico (natação 1h/dia, 5 dias/semana) de sete semanas. Na primeira fase os ratos D reduziram o ganho de peso corporal, a albuminemia e o glicogênio muscular e apresentaram elevada ingestão alimentar e teores de glicogênio muscular quando comparados aos ratos C. Na segunda fase todas as alterações foram normalizadas, exceto na maior ingestão alimentar verificada nos ratos R. Na última fase, os animais controles foram distribuídos em livres, albumina, proteínas totais, ácido láctico e teciduais como glicogênio hepático e muscular. O experimento consistiu de três fases: um protocolo de desnutrição protéica, com os ratos sendo alimentados com dois grupos: controles treinados (CT) e controles recuperado foi ganho de peso mas estiveram reduzidos nos ratos CT quando comparados aos animais CS. Os grupos treinados (RT e CT) apresentaram maior glicemia e menores concentrações séricas de ácidos graxos livres do que o grupo CS. Nos ratos CT, o valores de glicogênio hepático foram maiores que os observados nos ratos CS. Os teores de glicogênio muscular foram semelhantes em todos os grupos estudados. Em testes de cargas progressivas (exercício agudo) , durante a fase de treinamento, os animais CT e RT apresentaram valores séricos semelhantes de lactato. Finalizando, nossos resultados, na primeira fase experimental, mostraram alterações em algumas variáveis estudadas, caracterizando a desnutrição. Essas alterações se restabeleceram durante as fases de recuperação nutricional e treinamento físico, sendo que as análises realizadas nesses períodos demonstraram que a deficiência protéica inicial não causou interferência sobre os parâmetros bioquímicos observados em repouso e durante o exercício agudo
Abstract: This study was designed to determine if early malnutrition followed by nutritional recover and physical training can affect parameters as body weight gain, food intake and food efficiency; serum glucose, free fatty acids, albumin and total protein and 1iver and msccle glycogen in rest and after acute exercise. Research design consisted in three stages: a dieting protocol to produce protein malnutrition, where rats were fed a 25% (C) and 6% (D) protein diet for five weeks; a dieting protocol to recover the animais, where rats previously fed a 6% were fed a 25% protein (R) for six weeks; and seven weeks exercise training program (swimming lh/day, 5 day/week). On the first stage, the D-rats showed reduced body weight gain, albuminemia and muscle glycogen; and higher food intake and liver glycogen than C-rats. On the second stage, ali the alterations disapeared, except for the higher food intake in the R-rats. On the last stage, the C-rats were distributed into two groups: Trained (CT) and sedentary controls (CS), while the R-group were also submited to training (RT). The body weight gain was similar in RT and CS groups, but was lower in CT-rats than CS-rats. The trained groups (RT and CT) showed higher glycemia and lower serum free fatty acids than CS group. In the CT-rats, the liver glycogen content was higher than in CS-rats. Muscle glycogen content was similar in ali groups. During the training stage, the levels of the serum lactate during progressive load tests were similar between CT and RT. Indeed, our results, on the first stage, showed that the early malnutrition caused alterations in the variables observed. However, the dieting recover and exercise training protocols demonstrated that the initial protein deficiency caused no interference on biochemical variables, in rest and acute exercise
Mestrado
Fisiologia
Mestre em Ciências Biológicas