A three-dimensional parabolic equation (PE) and perturbation approach is used to invert for the depth- and range-dependent geoacoustic characteristics of the seabed. The model assumes that the sound speed profile is the superposition of a known range-independent profile and an unknown depth- and range-dependent perturbation. Using a Green’s function approach, the total measured pressure field in the water column is decomposed into a background field, which is due to the range-independent profile, and a scattered field, which is due to the range-dependent perturbation. When the Born approximation is applied to the resulting integral equation, it can be solved for the range-dependent profile using linear inverse theory. Although the method is focused on inverting for the sound speed profile in the bottom, it can also invert for the sound speed profile in the water column. For simplicity, the sound speed profile in the water column was assumed to be known with a margin of error of ± 5 m/s. The range-dependent perturbation is added to the index of refraction squared n2(r), rather than the sound speed profile c(ro). The method is implemented in both Cartesian (x,y,z) and cylindrical (r,q,z) coordinates with the forward propagation of the field in x and r, respectively. Synthetic data are used to demonstrate the validity of the method [1]. Two inversion methods were combined, a Monte Carlo like algorithm, responsible for a starting approximation of the sound speed profile, and a steepest descent method, that fine-tuned the results. In simulations, the inversion algorithm is capable of inverting for the sound speed profile of a flat bottom. It was tested, for three different frequencies (50 Hz, 75 Hz, and 100 Hz), in a Pekeris waveguide, a range-independent layered medium, and a range-dependent medium, with errors in the inverted sound speed profile of less than 3%. Keywords: Three-dimensional parabolic equation method, geoacoustic inversion, range-dependent sound speed profile, linear inversion, Born approximation, Green’s functions. / Includes bibliography. / Dissertation (Ph.D.)--Florida Atlantic University, 2017. / FAU Electronic Theses and Dissertations Collection

A cinza pesada é um sub-produto gerado do processo da queima do carvão mineral pulverizado nas caldeiras das termelétricas para a produção de vapor aquecido que atuará na geração de energia elétrica. Não há um destino adequado para esse tipo de cinza, sendo que o volume gerado diariamente é depositado em bacias de sedimentação, causando, dessa forma, problemas ambientais. Principalmente nos Estados Unidos, muitas pesquisas têm evidenciado o sucesso do emprego deste resíduo na construção de rodovias. Contudo, no Brasil as pesquisas sobre cinza pesada estão mais voltadas para a área de edificações. Deste modo, a proposta da pesquisa foi investigar os efeitos da cinza pesada quando incorporada a solos, através de ensaios laboratoriais, visando o aproveitamento deste resíduo na construção de bases e sub-bases de pavimentos. Também foi avaliado o efeito da adição de cal às misturas solo-cinza. Os ensaios utilizados na etapa experimental foram os de mini-CBR, resistência à compressão simples e resistência à tração por compressão diametral. Complementarmente, realizaram-se ensaios de CBR e de resistência à compressão simples na condição imersa. Os resultados mostraram que as adições de cinza pesada aos solos não melhoram as propriedades mecânicas das misturas compactadas. Entretanto, a adição de 3% de cal às misturas de solo-cinza proporciona a melhora significativa no comportamento mecânico das misturas, oferecendo uma solução para aproveitamento da cinza pesada na construção rodoviária. / Bottom ash is a by-product from the burning of mineral coal. It is utilized as fuel in thermal power stations in order to produce electrical energy. The bottom ashes are deposited in the lagoons and are harmful to the environment. In the United States, several researches have indicated successful uses of this waste in the construction of roadways. However, in Brazil the researches have been accomplished to use the bottom ashes in the civil construction. Thus, the purpose of the present research was to investigate the results of the bottom ash additions to soil in order to utilization in bases and sub-bases of pavements. Afterward, the effects of lime additions to soil-bottom ash mixtures were evaluates. The tests employded were mini-CBR, unconfined compressive strength and indirect tensile strength. California bearing ratio and immersion unconfined compressive strength were accomplish such supplementary tests. The results indicated that bottom ash additions to soils does not improve the mechanical properties of the compacted mixtures. However, the addition of the 3% of the lime to soil-bottom ash mixtures provided better mechanical performance, offering a feasible solution for the use of this waste in road construction.

O mercado de baixa renda tem se tornado cada vez mais relevantes para todos os setores empresariais. Estima-se que em 2010 as classes C e D serão responsáveis por mais da metade do consumo do mercado interno brasileiro. Empresas de transporte aéreo brasileiras de passageiros, que historicamente se caracterizaram por prestar serviço voltado para as classes de maior renda, passaram a desenvolver estratégias para atrair o público de baixa renda para viajar de avião, partindo de estratégias concebidas em outras indústrias e adaptando às particularidades do setor aéreo. O presente trabalho identificou as estratégias de empresas aéreas brasileiras para atender o mercado de baixa renda. Devido ao fato do mercado de baixa renda para o transporte aéreo ser ainda embrionário, as estratégias se concentra ainda no composto mercadológico, como produto, preço, canal de distribuição, comunicação e serviço. Práticas adotadas pelo varejo para atrair e reter o consumidor de baixa renda, como a loja de vizinhança, porta a porta, meios de financiamento alternativos ao cartão de crédito tem sido testadas e adotadas pelas empresas aéreas analisadas, complementando as práticas usuais do mercado. Essa pesquisa avaliou ainda os principais fatores indutores e restritivos à inserção da baixa renda no setor de transporte aéreo. A maior preocupação das empresas aéreas analisadas nesse estudo é com a infra-estrutura aeroportuária, que pode se tornar limitador da expansão do setor aéreo no Brasil. Já as operadoras de turismo são percebidas pelas empresas aéreas como agente indutor à inserção da população de baixa renda, em especial pela venda de pacotes de turismo. Finalmente, essa pesquisa avaliou, ainda que de maneira sucinta as estratégias de negócio adotadas pelas empresas aéreas, e identificou um modelo de baixo custo brasileira. Trata-se de um modelo híbrido entre as estratégias de diferenciação e baixo custo. As empresas analisadas procuram simultaneamente oferecer serviços para clientes corporativos e estimular novos mercados, sobretudo o mercado de baixa renda. De acordo com Porter (1985), esse tipo de estratégia poderia ser classificado como meio-termo, visto que a empresa não adota nenhuma das estratégias genéricas. Porém, o histórico dessas empresas permite avaliar que essas empresas iniciaram sua operação com modelo mais próximo à estratégia de baixo custo, e tiveram que evoluir ou reformular completamente esse modelo de acordo com as características do mercado brasileiro. / The Bottom of Pyramid has become increasingly relevant market to all business sectors. It is estimated that in 2010 social classes C and D will account for over half the consumption of the Brazilian domestic market. Brazilian airlines, who have historically been characterized by providing service for the high income classes, began to develop strategies to attract lowincome public to travel by plane, using strategies developed in other industries and adapting to the particularities of the airline industry. This research has identified strategies for Brazilian airlines to reach the Bottom of Pyramid market. As this segment is still limit, strategies still focus on the marketing mix, such as product, price, distribution channel, communication and service. Practices adopted by retailers to attract and retain low-income consumers, as the neighborhood store, door to door, alternative financing to credit card have been tested and adopted by the airlines studied, complementing the usual practices of the market. This research also evaluated the main factors that affect the introduction of Bottom of Pyramid in the airline industry. The major concern of airlines examined in this study is with the airport infrastructure, which can limit the expansion of the airline industry in Brazil. Tour operators are already perceived by the airlines as a promoter for this process. Finally, this research evaluated the business strategies adopted by airlines, and identified a Brazilian low-cost model. The model is a hybrid between the strategies of differentiation and low cost. The analyzed airlines are seeking to offer services to both corporate customers and stimulate new markets, particularly the Bottom of Pyramid. According to Porter (1985), this strategy could be classified as stuck in the middle, because the company does not adopt any of the generic strategies. However, the history of these companies can assess that these companies started their operation with model closer to the strategy of low cost, and they had to evolve or completely redesign this model according to the characteristics of the Brazilian market

Managing energy demand is essential to energy security and climate change mitigation. The industrial sector accounts for over a fifth of UK primary energy demand and greenhouse gas emissions. Energy intensive industry is uniquely restricted in the way it uses energy and emits greenhouse gasses. In this thesis, the potential of radical measures to achieve significant energy demand reduction and emissions abatement in UK energy intensive industry is assessed. Adopted is a multidisciplinary approach combining thermodynamic and techno-economic analysis techniques. Bottom-up assessments are applied to key energy intensive sectors of industry to capture the diverse and interactive array of technological characteristics invisible from a top-down perspective. Detailed projection models are built to design and analyse technology roadmaps for the sectors out to 2050. In an illustrative roadmap assessment, the technological pathways of radical process transition and carbon sequestration were each shown to achieve about 80% abatement in 2050 from 1990 emissions levels. Radical process transition achieved greater abatement before 2030 and this was reflected in lower cumulative emissions over the full period. Higher risk is associated with carbon sequestration from its reliance on timely access to CO2 transport and storage technology to compensate for lower short-medium term abatement. Although, combining carbon sequestration with high levels of biomass combustion indicated the largest potential abatement to 2050. Abatement economics in the iron and steel sector are notably sensitive to resource costs and the carbon trading price. The carbon trading price influences relative production costs in favour of higher abating pathways, but increases absolute costs. This signals the need for supportive policy measures that accelerate technology development and deployment while mitigating the risk of the carbon trading price to competitiveness. Some carbon capture technologies reduce relative production cost even in the absence of a carbon price, but this excludes the cost of CO2 transport and storage. Meanwhile, radical process transition pathways have a higher dependence on the future prices of natural gas, electricity, and scrap. Future work should focus on expanding the economic appraisal to other sectors and to indirect costs, as well as incorporating wider material efficiency strategies and running different future scenarios.

Idag startas många projekt kring samverkan men de implementeras sällan i verksamheterna och ger således ingen bestående förändring. Ledarskapskompetens i samband med implementering av organisationsförändring har visat sig vara av stor betydelse. Storstadssatsningen är ett samverkansprojekt och projektet Bärkraft är en del i Storstadssatsningen, vilken startades i Borås för att utveckla samverkan mellan verksamheter i Brämhults kommundel. Samverkan behandlas i teorin som att viktiga attribut för lyckad samverkan är att vilja, kunna och förstå. Andra aspekter är hur samverkan mellan verksamheter byggs upp kring olika kategorier. Studiens syfte är att jämföra hur chefer inom två organisationer upplever att projektet Bärkraft inverkat på deras verksamheter och vidare om denna utveckling har mynnat ut i samverkansprocesser mellan de deltagande organisationerna i projektet. Vi ämnar också undersöka medarbetarnas upplevelser av hur cheferna har påverkat utvecklingen i verksamheten och om de upplever att en samverkansprocess har etablerats mellan de deltagande organisationerna.Studiens metod har en kvalitativ ansats där nio intervjuer har genomförts med fyra chefer och fem medarbetare i två organisationer. Intervjuerna spelades in, skrevs ut ordagrant och analyserades enligt marginalmetoden för att tolka och förstå respondenternas utsagor. I resultat av chefernas intervjuer kan vi utläsa att skillnader i utveckling och samverkan berott på olika förutsättningar verksamheterna har haft och det har påverkat deras arbetssätt. Det finns i medarbetarnas upplevelser skiljda meningar om i vilken utsträckning utveckling och samverkan skett, dock framhålls det som att det i viss mån lett till utveckling samt samverkan. I diskussionen har vi kommit fram till att det har funnits olika utgångspunkter och förutsättningar för verksamheterna arbete med det fortsatta utvecklingsarbetet. Vidare anses detta haft en väsentlig betydelse för att olika arbetsmetoder utvecklas för att inom verksamheten kunna arbeta med utveckling och samverkan. / Program: Organisations- och personalutvecklare i samhället

A cinza pesada é um sub-produto gerado do processo da queima do carvão mineral pulverizado nas caldeiras das termelétricas para a produção de vapor aquecido que atuará na geração de energia elétrica. Não há um destino adequado para esse tipo de cinza, sendo que o volume gerado diariamente é depositado em bacias de sedimentação, causando, dessa forma, problemas ambientais. Principalmente nos Estados Unidos, muitas pesquisas têm evidenciado o sucesso do emprego deste resíduo na construção de rodovias. Contudo, no Brasil as pesquisas sobre cinza pesada estão mais voltadas para a área de edificações. Deste modo, a proposta da pesquisa foi investigar os efeitos da cinza pesada quando incorporada a solos, através de ensaios laboratoriais, visando o aproveitamento deste resíduo na construção de bases e sub-bases de pavimentos. Também foi avaliado o efeito da adição de cal às misturas solo-cinza. Os ensaios utilizados na etapa experimental foram os de mini-CBR, resistência à compressão simples e resistência à tração por compressão diametral. Complementarmente, realizaram-se ensaios de CBR e de resistência à compressão simples na condição imersa. Os resultados mostraram que as adições de cinza pesada aos solos não melhoram as propriedades mecânicas das misturas compactadas. Entretanto, a adição de 3% de cal às misturas de solo-cinza proporciona a melhora significativa no comportamento mecânico das misturas, oferecendo uma solução para aproveitamento da cinza pesada na construção rodoviária. / Bottom ash is a by-product from the burning of mineral coal. It is utilized as fuel in thermal power stations in order to produce electrical energy. The bottom ashes are deposited in the lagoons and are harmful to the environment. In the United States, several researches have indicated successful uses of this waste in the construction of roadways. However, in Brazil the researches have been accomplished to use the bottom ashes in the civil construction. Thus, the purpose of the present research was to investigate the results of the bottom ash additions to soil in order to utilization in bases and sub-bases of pavements. Afterward, the effects of lime additions to soil-bottom ash mixtures were evaluates. The tests employded were mini-CBR, unconfined compressive strength and indirect tensile strength. California bearing ratio and immersion unconfined compressive strength were accomplish such supplementary tests. The results indicated that bottom ash additions to soils does not improve the mechanical properties of the compacted mixtures. However, the addition of the 3% of the lime to soil-bottom ash mixtures provided better mechanical performance, offering a feasible solution for the use of this waste in road construction.

No description available.

Sustainability within the spheres of environmental and social awareness have become increasing salient issues in the world today. This is addressed within the corporate world through Corporate Social Responsibility (CSR) disclosure and reporting. However, the reporting and disclosure surrounding such issues remains at a disadvantage in comparison to that of financial reporting. These issues not only govern sustainability and awareness itself but increasing investor and stakeholder decisions concerning firms connected to these issues. This thesis aims to explore the issues encountered today in CSR reporting. It reviews current literature on regional differences, current methods of CSR disclosure, and the drawbacks of current reporting standards. To address these topics, there is a review of the definition of a stakeholder, its development over time and how stakeholders are prioritized and affected by the actions of firms. With the definition of a stakeholder established, the thesis reviews the relationship between different stakeholders and CSR disclosure and how this can be applied in order to increase the quality and consistency of CSR reporting. Finally, trends in CSR and differences within sectors and regions are considered and it is determined that there has to be a development of standardization through a current reporting standard, in order to ensure congruency of information across nations and sectors, allowing investors and stakeholders to make better informed decisions through the provided sustainability information.

The seafloor properties are of high importance for many applications such as marine biology, oil and gas exploration, laying cables, dredging operations and off-shore construction. Several approaches exist to classify the properties of the seabed. These include taking direct samples of the seabed (e.g., coring), however, these methods are costly and slow. Underwater acoustic remote sensing techniques are of interest because they are lower cost and faster. The information about the seabed properties can be extracted by studying the energy of single beam echo sounders (SBES). This can be done by either phenomenological or numerical methods [1], [2]. This research investigates a numerical, model-data fitting method using a high frequency backscattering model developed by Jackson et al [3]. In this "inversion modeling" method, the matching process between the model and average echo envelope provides information about the sediment parameters, namely the sediment mean grain size (Mz) as the indicator of the seabed type, spectral parameter (W2) as the indicator of seabed roughness and normalized sediment volume parameter σ2 as the indicator of the scattering due to sediment inhomogeneities.

The distribution of phosphorus in the sediment of Hyrum Reservoir was studied by collecting and analyzing 84 sediment samples for total, inorganic, organic, and water-soluble phosphorus. Sample locations were mapped by triangulation and sediment phosphorus distribution maps were made. Sediment analysis showed average total phosphorus content of 755 micrograms per gram, with organic phosphorus composing approximately 97 percent of total phosphorus. Sediment samples showed variability in phosphorus content which precluded identification of point sources of phosphorus input to the reservoir. Several areas of comparatively higher phosphorus content in the sediments were shown with isopleth maps. An estimate of the extent of sedimentation at each sample site was made. Sediment phosphorus content showed no significant correlation with reservoir sedimentation as determined in this study.