Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"energy problem"”.
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Modelling energy efficiency for computation
In the last decade, efficient use of energy has become a topic of global significance, touching almost every area of modern life, including computing. From mobile to desktop to server, energy efficiency concerns are now ubiquitous. However, approaches to the energy problem are often piecemeal and …
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A study of chameleon-photon mixing from pulsars
A number of solutions to the dark energy problem have been proposed in literature, the simplest is the cosmological constant A. The cosmological constant lacks theoretical explanation for its extremely small value, thus dark energy is more generally modelled as a quintessence scalar field rolling …
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Relativistic corrections to weak lensing convergence
A fundamental issue in modern science is the dark energy problem - the apparent accelerating expansion of the universe. Many cosmological observations of the Cosmic Microwave Background (CMB), Baryon Acoustic Oscillation (BAO) and weak lensing have been carried out to try to understand the nature …
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Passive solar energy application in townhouse design: a case study
… by itself was a difficult task in the past, the energy issue made the options very limited, and the planner and/or engineer deal with the solution more often technically intended with or without considering the energy problem. This study is centered on the energy issue as part of the design …
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Copper(I) phenanthroline complexes and supramolecular systems containing fullerenes: Photophysics, photochemistry and potential applications in sustainable energy technologies.
… to modify our inefficient and fossil-fuel based energy system. The present work was motivated by the search for efficient photoactive materials to be employed in the context of the energy problem: materials to be utilized in energy efficient devices and in the production of renewable electricity …
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Alternative energy systems for Puerto Rico : analysis and comparison of anaerobic waste digestion
Energy prices in Puerto Rico are increasing constantly, making evident the need for alternative energy sources. Several methods to produce power have been developed as alternatives to burning petroleum, such as solar energy generation, but these processes have not been successfully implemented in …
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Production of Renewable Diesel Fuel via Hofer-Moest Decarboxylation of Free Fatty Acids
… of petroleum globally, has created an escalating energy problem. Advanced biofuels, derived from biologically grown feedstocks, are renewable fuels which provide a drop-in replacement for petroleum. One potential conversion pathway to turn lipid-based biomass feedstocks into a renewable diesel …
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Optimally controlling hybrid electric vehicles using path forecasting
… directions towards the solution of serious problems of our era, such as the energy problem, the increasing cost of oil, and the greenhouse gas emissions. In the current project we are given a route and an HEV simulation model, and we aim to minimize the fuel consumption of the vehicle along …
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On social knowledge, ideology and the nuclear power debate
Many of the issues and problems concerning the role of our frameworks and structures of reasoning in the guidance of the process of social and technological development are encapsulated in the debate about nuclear energy. This thesis takes that debate as a context for analysing the rationality of …
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Power Sources for Sensors and Robots in Remote and Inaccessible Environments
… robots. This thesis works towards addressing the energy demand for sensors in those inaccessible environments, and by extension exploring their potential applications. In specific, we approach this goal in 2 aspects. On one hand, we developed and optimized thermal energy harvesting systems to …
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Nonperturbative study of SU(N) Yang–Mills theory with gauge invariant condensates of mass dimension two
… offering a much needed solution to many a low-energy problem. It has turned out to be possible to study it in a renormalizable framework. I show that this framework can be extended to include background fields in the background gauge. In the seventies the vacuum of SU(2) Yang–Mills theory was …
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Topics in Theoretical Gravity
… issues. Chapter 2 is about the quasilocal energy, which is a mathematical tool for defining gravitational energy. We extend previous definitions so that they are valid within the event horizon of a black hole. We find that the energy at the center is finite rather than divergent, indicating …
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An empirical investigation of a social accounting issue: a study of the association between energy usage and business risk
… to show that an association exists between the energy usage of manufacturing industries and companies and their risk. This possibility was considered important because of the attention that has been focused on energy problems since the OPEC oil embargo and the interest of investors in the risk …
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A farm-level model to evaluate the impacts of current energy policy options
… applications of the aggregated approach to the problems that scarce or costly energy will pose for agriculture. It is argued that viewing potential responses to such energy scenarios at the level of the farm business is likely to yield greater understanding of the ways such scenarios will impact …
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Performance composability: An emerging challenge in performance-adaptive systems
… in the absence of failures and bottlenecks. The problem essentially lies in performance composability or lack thereof; a challenge that arises because individual optimizations in performance-sensitive systems generally do not compose well when combined. Performance adaptation in such systems …
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Multiattribute utility functions for the deep borehole filter restoration problem
The energy problem is one of the biggest challenges facing the World in the 21st century. It is related to the issues of natural resource extraction, resource depletion, power generation, environmental degradation, and atmospheric change such as global warming. Since more than 80% of the world’s …
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Modeling and Optimization of Rechargeable Sensor Networks
… the sensor nodes run out of battery. To conserve energy and prolong the lifetime of a WSN, there have been active research efforts across all network layers. Although these efforts help conserve energy usage and prolong network lifetime to some extent, energy and lifetime remain fundamental …