Tesis sobre el tema "Global peak"
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Sorrell, Steve. "Analysing controversies in energy policy : assessing the evidence for rebound effects and global oil depletion". Thesis, University of Exeter, 2012. http://hdl.handle.net/10871/11544.
Texto completoOyeyemi, Elijah Oyedola. "A global ionospheric F2 region peak electron density model using neural networks and extended geophysically relevant inputs". Thesis, Rhodes University, 2006. http://hdl.handle.net/10962/d1005255.
Texto completoThorbjörnsson, Anders. "Carbon Capture and Storage : Energy penalties and their impact on global coal consumption". Thesis, Uppsala universitet, Naturresurser och hållbar utveckling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-235442.
Texto completoAtzberger, Craig Philip. "A Complex Systems Approach to Sustainability: Can Peak Oil Fuel the Sub-Saharan AIDS Epidemic?" online version, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=case1156898969.
Texto completoCordell, Dana. "The Story of Phosphorus : Sustainability implications of global phosphorus scarcity for food security". Doctoral thesis, Linköping : Department of Water and Environmental Studies, [The Tema Institute], Linköping University, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-53430.
Texto completoLiu, Lollo. "Life Cycle Assessment of a Lithium-Ion Battery pack for Energy storage Systems : - the environmental impact of a grid-connected battery energy storage system". Thesis, Uppsala University, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-428627.
Texto completoTupin, Simon. "Caractérisation de l'effet de la microstructure collagénique sur le comportement mécanique global des peaux reconstruites". Ecole nationale d'ingénieurs (Saint-Etienne), 2015. http://www.theses.fr/2015ENISE032.
Texto completoThe aim of this thesis is the multi-scale study of the mechanical and structural properties of artificial skin. Firstly, an experimental device was designed to evaluate the mechanical properties at macroscopic scale (indentation and relaxation tests). Bi-axial study of the stiffness of different layers through depth was performed with an original device based on continuous stiffness measurements. Combination of bi-photonic confocal microscopy with a tensile test permitted the assessment of the Poisson coefficient of the reconstructed tissues, stresses and tensile forces of the collagen fibers network. Results of the studies revealed the suitability of the developped experimental tools to study aging mechanism and microstructure effects on the global mechanical behavior of artificial skin
Müller, Jürgen [Verfasser]. "Modellierung der globalen Goldproduktion durch Anwendung der Hubbert'schen Peak-Oil Methodik / Jürgen Müller". Norderstedt : Books on Demand, 2012. http://d-nb.info/1019465735/34.
Texto completoNordangård, Jacob. "Med brödfödan som drivkraft : En studie om att byta olja mot biodrivmedel i ett globalt perspektiv". Thesis, Linköping University, Department of Water and Environmental Studies, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8116.
Texto completoAv två anledningar anses det som mycket viktigt att bryta beroendet av olja, naturgas och kol. Den första anledningen är de uppmärksammade klimatförändringarna. Förbränning av fossila bränslen anges idag som huvudorsak till växthuseffekten. Den andra mindre uppmärksammade orsaken är att oljan och naturgasen snart inte räcker till för att föda en allt energihungrigare värld. Utvinningen ser dessutom ut att ha nåt sin kulmen. Efter denna kommer en oundviklig produktionsnedgång. Med det stora beroendet som finns av oljan inom i stort sett alla sektorer är det ytterst viktigt att hitta andra alternativ. Speciellt gäller detta inom transportområdet. Förhoppningen står idag till ”gröna” drivmedel som etanol och biodiesel. IEA (International Energy Agency) har uppmanat de västerländska nationerna att satsa stort på biobränslen. I denna studie görs en analys av de förutsättningar som finns att bygga ut produktionen av denna i USA, Brasilien och Malaysia/Indonesien. Syftet har varit att ta reda på om det är möjligt att göra detta utan att inkräkta på andra näringar, inte skada miljön samt vara oberoende av fossil energi? Den bakomliggande teorin är att detta inte låter sig göras i den omfattning som krävs för att bibehålla de nuvarande samhällsstrukturerna. Detta visar sig också stämma med de uppgifter som står till buds. Endast en fraktion av det nuvarande drivmedelsbehovet går att försörja med biodrivmedel om det inte ska uppstå en allvarlig konkurrens om odlingsmarken eller orsaka stora ekologiska skador.
Walsh, Tim. "Local Implications of Globally Restricted Mobility: A study of Queenstown’s vulnerability to peak oil and climate change". Thesis, University of Canterbury. Geography, 2011. http://hdl.handle.net/10092/5654.
Texto completoKylander, Malin E. "Global perspectives on natural and anthropogenic controls on atmospheric lead and dust cycling using peat bog archives". Thesis, Imperial College London, 2006. http://hdl.handle.net/10044/1/7481.
Texto completoLehtinen, Emma. "Ekologisk hållbarhet". Thesis, Malmö universitet, Fakulteten för kultur och samhälle (KS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-23061.
Texto completoThis bachelor thesis is based on case studies of construction companies that operate in Sweden, Europe and the US. The focus of the studies was how these three Swedish construction companies apply and translate global environmental goals in their work. Hence, the study concentrated on the global concepts of sustainability, ecological sustainability and Agenda 2030. These concepts underwent a close analysis concerning how they can be interpreted, translated and become operational in practice depending on different expertise and profession. Based on this analysis, the concepts of sustainability and ecological sustainability were interpreted to some potential understandings to be used in this study.To analyse how the three Swedish construction companies understand and promote environmental goals, each company’s website were analysed regarding the concept of sustainability, ecological sustainability and comprehensive global goals in the field of construction. The companies included were NCC AB, Peab AB and Skanska AB. The purpose of the study was to gain knowledge about how these companies work with sustainability and act on new environmental goals. In addition, three representatives for each company were interviewed based on questions that related to the company’s work with sustainability. The interviews aimed at acquiring further knowledge on each company’s work with sustainability. Due to the spread of the COVID-19, the representatives were interviewed online.An increased knowledge of how to manage and work with ecological sustainability is an important aspect that needs to be developed and improved in the field of built environment and architecture in order to improve our homes and activities in the community. In order to create a better indoor and outdoor environment for man and nature, it’s necessary to improve the work behind ecological sustainability. In this study, visualisations and tables help the reader to understand the concepts used in this study.
Weber, Valentine. "Simulation numérique du procédé de refusion sous laitier électroconducteur". Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL010N/document.
Texto completoElectro Slag Remelting (ESR) is widely used for the production of high-value-added alloys such as special steels or nickel-based superalloys. Because of high trial costs and complexity of the process, trial-and-error based approaches are not well suitable for fundamental studies and optimization of the process.Consequently, a transient-state numerical model which accounts for electromagnetic phenomena and coupled heat and momentum transfers in an axisymmetrical geometry has been developed. The model simulates the continuous growth of the electroslag remelted ingot through a mesh-splitting method. In addition, solidification of the metal and slag is modelled by an enthalpy-based technique. A turbulence model is implemented to compute the motion of liquid phases (slag and metal), while the mushy zone is described as a porous medium whose permeability varies with the liquid fraction, thus enabling an accurate calculation of solid/liquid interaction. The coupled partial differential equations are solved using a finite-volume technique.Computed results are compared to experimental observation of 4 industrial remelted ingots fully dedicated to the model validation step. Pool depth and shape are particularly investigated in order to validate the model. Comparison shows that the model can be used as a predictive tool to analyse the process behavior. Nevertheless, it is necessary to pay a particular attention to the estimation of the thermophysical properties of metal and especially slag.These results provide valuable information about the process performance and influence of operating parameters. In this way, we present some examples of model use as a support to analyse the influence of operating parameters. We have studied the variation of electrode immersion depth, fill ratio and water pressure in the cooling circuit
FURTADO, Artur Muniz Szpak. "Técnicas de seguimento do ponto de máxima potência para sistemas fotovoltaicos com sombreamento parcial". Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/17824.
Texto completoMade available in DSpace on 2016-09-12T14:19:20Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Artur_Muniz_Dissertacao_Digital_Biblioteca.pdf: 14042205 bytes, checksum: 21290a8d10774b2848f16e9351043b9a (MD5) Previous issue date: 2016-02-26
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A curva da potência em função da tensão nos terminais de uma conexão em série de módulos fotovoltaicos, com diodos de passagem protetores, exposta a um sombreamento parcial, exibe um comportamento com múltiplos picos. Os múltiplos picos tornam as estratégias clássicas de seguimento do ponto de máxima potência, ou MPPT, ineficazes. Em primeiro momento, este trabalho realiza uma análise estatística que determina uma região trapezoidal no plano tensão potência onde o ponto de máxima potência global está inserido para qualquer situação de irradiâncias múltiplas e temperatura, para configurações com inversor central e módulos conectados em séries puras ou conectadas em paralelo. Em segundo momento, este trabalho pesquisa as técnicas de MPPT Global que rastreiam o ponto de máxima potência global de uma curva tensão potência com múltiplos picos. Duas destas técnicas são estudadas a fim de avaliar a rapidez em encontrar o ponto de máxima potência global e a energia perdida na busca. Por fim, é proposta uma nova técnica de MPPT Global baseada no estudo estatístico preliminar. Esta nova técnica é proposta tirando proveito do trapézio delimitado na análise estatística.
The power-voltage characteristic of series arrays of photovoltaic modules with bypass diodes under partial shading conditions, displays a multiple peaks behavior. The multiple peaks make the classical algorithms of maximum power point tracking, or MPPT, ineffective. At first, this work performs a statistical analysis that determines a trapezoidal region in the power voltage plan where the global maximum power point is situated for any situation from multiple irradiances and any temperature, for central inverter configuration with a series array of modules or parallel connected series arrays. Soon after, this paper researches the Global MPPT techniques that track the global maximum power point of power-voltage curves with multiple peaks. Some of these techniques are studied to assess how fast they can find the global maximum power point and the energy lost at this search. Finally, it is proposed a new Global MPPT technique based on the preliminary statistical study. This new technique is proposed taking advantage of the trapezoidal region defined in the statistical analysis.
Oliveira, Lucas Kerr de. "Petróleo e segurança internacional : aspectos globais e regionais das disputas por petróleo na África Subsaariana". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/11150.
Texto completoThe importance of oil has been revised in the latest years, mainly due to its strategic-military function, not only in the twentieth century, when control over this resource allowed the rise of great powers, but also in current conflicts. The latest included Africa in the global disputes over oil. Global context becomes complex as the world-wide oil crisis gets deeper, during the crisis of capital accumulation and hegemony, both having started in the 1970s. The intensification of regional conflicts and intense competition among great powers over increasingly scarce energetic resources are essential variables to the analysis of International Security problems. In this context, the African continent, responsible for 12% of world oil production, becomes globally more relevant for having doubled its reserves volume. In the subsaharan portion it has almost tripled since the 1980s. Disputes over oil make historical conflicts greater and create new cycles of violence. In the greatest sub-shaharan oil producers, such as Angola, Nigeria and Sudan these conflicts create new disputes between government and producing provinces. In a global level, North-American and Chinese corporations compete directly for access to African oil, supported by the respective governments that intensify their regional presence in the form of investments, commercial, diplomatic and military agreements, training and defense agreements, transference of weapons and installation of military bases. Thus, oil becomes central to understand the current dynamics of these sub-saharian conflicts in the regional level as well as the disputes for influence on the subcontinent involving China and United States of America.
Oyeyemi, Elijah Oyedola. "A global ionospheric F2 region peak electron density model using neural networks and extended geophysically relevant inputs /". 2005. http://eprints.ru.ac.za/256/.
Texto completoBradford, John Hamilton. "Systems, Social Order, and the Global Debt Crisis". 2010. http://trace.tennessee.edu/utk_graddiss/778.
Texto completoHowe, Samuel. "Quantifying & Characterising Peak Intensities of Professional Rugby using GPS & Accelerometers". Thesis, 2020. https://vuir.vu.edu.au/42069/.
Texto completoGill, Allison Lorraine. "Coupling of belowground biogeochemical cycles and plant carbon allocation strategies highlight global patterns in resource limitation and ecosystem-level responses to global change". Thesis, 2017. https://hdl.handle.net/2144/27079.
Texto completoDI, FINA DARIO. "Multi-Target Tracking and Facial Attribute Estimation in Smart Environments". Doctoral thesis, 2016. http://hdl.handle.net/2158/1029030.
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