It is evident that human activity has an important impact on climate. Constantly increasing energy demand is one of the biggest causes of climate change. The fifth assessment report of the Inter-governmental panel on climate change states that decarbonisation of electricity generation is a key component of climate change mitigation. Increased awareness of this fact and escalating concerns around energy security has brought public attention to the energy industry, especially sustainable power generation systems. Future energy systems may need to include hydrogen as an energy carrier in order to achieve necessary levels of CO2 emission reductions, and overcome the challenges renewable energy systems present. Fuel cells could be a corner stone of future hydrogen inclusive energy solutions. New solutions like fuel cells have to compete with existing technologies and overcome the shortcomings of emerging technology. Though these shortcomings are well-recognised, fuel cells also have many advantages which makes continued research and development in the field highly worthwhile and viable. Key to their adoption is the identification of a niche market to utilise their advantages while overcoming their shortcomings with continuous research and development. This thesis aims to evaluate some of the stationary fuel cell applications and determine whether one could become the niche market as an entry point for fuel cells. This is achieved by economic evaluations of real and hypothetical applications. Results of the studies here imply that to decrease the total life cycle impacts of fuel cells to more acceptable levels, resource use in the manufacturing phase and recycling in decommissioning should be shown more attention. Results also present a picture showing that none of the applications investigated are economically feasible, given the current state of technology and energy prices. However, fuel cell-based combined cooling, heating and power systems for data centres show the potential to become the niche market that fuel cells need to grow. A further conclusion is that a broad market, longer stack lifetime, the possibility of selling electricity back to the grid and governmental subsidies are essential components of an environment in which fuel cells can permeate through the niche market to the mainstream markets. / <p>QC 20151210</p>

This thesis represents a series and hierarchy of architectural ideas explored through the vessel of one design project; a multi-generational family farm house in Blacksburg, Virginia. The relationship between ideas of courtyard and farmyard, as joined and segregated spaces, is one level of exploration. Another is the relationship between such spaces, joined and segregated, within the interior of the main house. From these primary ideas emerged several other ideas related to nature and qualities of these spaces as built entities, such as meaning, proportion, pattern, and material. / Master of Architecture

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Tyto teze navazují na studium gramatických a automatových systémů. Na začátku, práce pojednává o regulárně řízených CD gramatických systémech využívající frázově strukturované gramatiky jako komponenty. Do systémů jsou zavedena tři nová omezení na derivacích a je studován jejich vliv na vyjadřovací sílu těchto systémů. Poté, tato práce definuje dva automatové protějšky ke kanonickým multi-generatiním nonterminálem a pravi\-dlově synchronizovyným gramatickým systemům, generujících vektory řetězců, a ukazuje, že všechny tyto vyšetřované systemy si jsou vzájemně ekvivalentní. Dále táto práce tyto systémy zobecňuje a zakládá fundamentalní hierarchii n-jazyků (množin n-tic řetězců). V~souvislosti se zavedenými systémy tyto teze zavádí automatově-gramatický převodník založený na konečném automatu a bezkontextové gramatice. Tento převodník je pak studovaný a použitý jako nástroj přímého překladu. V~poslední části jsou v této práci zavedené automatové systémy jádrem pársovací metody založené na stromově řízených gramatikách s n omezenými cestami.

This work deals with syntax analysis problems based on multi-generation. The basic idea is to create computer program, which transforms one input string to n -1 output strings. An Input of this program is some plain text file created by user, which contains n grammar rules. Just one grammar from the input file is marked as an input grammar and others n -1 grammars are output grammars. This program creates list of used input grammar rules for an input string and uses corresponding output grammar rules for the creation of n -1 output strings. The program is written in C++ and Bison

Professional nurses comprise the largest number of health care professionals in South Africa. High turnover rates contribute to shortages of nurses in South Africa, aggravated by the emigration of nurses, inadequate recruitment of student nurses, and the expected retirement of many baby boomer nurses by 2016. This study addressed factors influencing the retention of professional nurses in the Gauteng Province of South Africa. In phase 1, postal questionnaires were completed by 101 registered nurses while semi-structured interviews were conducted with 21 nurse managers in phase 2. Personal, organisational and managerial factors influenced the retention potential of the professional nurses. In terms of Maslow' Hierarchy of Needs Theory, most factors influencing nurses' retention operated on the lowest (physiological) level and concerned remuneration. Safety needs were compromised by the lack of equipment and supplies, the shortage of nurses and unsafe working places. Esteem needs included respect from doctors, managers and colleagues as well as recognition for outstanding performance. In terms of Vogt et al's Theory of Nurse Retention Theory, the constrictions caused by inadequate remuneration and safety aspects should be addressed. Lewin's Force-Field Analysis Theory recommends that the factors that influence nurses' retention negatively should be unfrozen, changed and refrozen, including communication. Based on these results guidelines were compiled for enhancing the retention rates of professional nurses (Annexure G). / Health Studies / D.Litt. et Phil. (Health Studies)

Professional nurses comprise the largest number of health care professionals in South Africa. High turnover rates contribute to shortages of nurses in South Africa, aggravated by the emigration of nurses, inadequate recruitment of student nurses, and the expected retirement of many baby boomer nurses by 2016. This study addressed factors influencing the retention of professional nurses in the Gauteng Province of South Africa. In phase 1, postal questionnaires were completed by 101 registered nurses while semi-structured interviews were conducted with 21 nurse managers in phase 2. Personal, organisational and managerial factors influenced the retention potential of the professional nurses. In terms of Maslow' Hierarchy of Needs Theory, most factors influencing nurses' retention operated on the lowest (physiological) level and concerned remuneration. Safety needs were compromised by the lack of equipment and supplies, the shortage of nurses and unsafe working places. Esteem needs included respect from doctors, managers and colleagues as well as recognition for outstanding performance. In terms of Vogt et al's Theory of Nurse Retention Theory, the constrictions caused by inadequate remuneration and safety aspects should be addressed. Lewin's Force-Field Analysis Theory recommends that the factors that influence nurses' retention negatively should be unfrozen, changed and refrozen, including communication. Based on these results guidelines were compiled for enhancing the retention rates of professional nurses (Annexure G). / Health Studies / D.Litt. et Phil. (Health Studies)