Neste estudo, o tamanho médio do Sortable Silt da fração ‹ 63 micra dos sedimentos terrígenos foi medido em um testemunho para os últimos 800 ka na Bacia de Santos. Os estágios isotópicos marinhos (MIS) foram identificados até MIS o 19. Investigamos as variações oceanográficas passadas para obter uma melhor compreensão sobre a intensidade do fluxo de corrente de fundo durante os períodos glaciais / interglaciais. Os registros contínuos do Sortable Silt, isótopos de oxigênio e carbono, susceptibilidade magnética, taxa de sedimentação, fluxos de massa e conteúdo de carbonato foram obtidos e mostraram uma forte modulação com a intensidade do fluxo de corrente de fundo em resposta a ciclos glaciais e interglaciais. Em geral, para os períodos glaciais, foi possível observar uma dominância do deslocamento da água do fundo em direção ao norte. Uma comparação entre diferentes métodos de análise granulométrica (laser e técnica de pipetagem), revelou que ambos caracterizam os períodos interglacial e glacial. As análises espectrais mostraram um forte sinal no Sortable Silt para os ciclos da excentricidade (∼ 100 ka), o que foi confirmado pelos isótopos de oxigênio e susceptibilidade magnética, que apresentaram um sinal similar. Variações concomitantes no Sortable Silt e nos diferentes traçadores confirmam o potencial do primeiro como um proxy para a intensidade do fluxo de corrente de fundo. / In this study, the Sortable Silt mean size of the ‹ 63micra terrigenous sediment fraction were measured in a core for the last 800kyrs in Santos Basin. Marine Isotopic Stages (MIS) down to MIS 19 were identified. We investigate the past oceanographic variations to obtain a better understanding about bottom-current flow intensity during glacial/interglacial periods. Continuous records of Sortable Silt, oxygen and carbon isotopes, magnetic susceptibility, sedimentation rate, mass fluxes and carbonate content were obtained and show a strong modulation of bottom-current flux intensity in response to glacial and interglacial cycles. In general, for glacial periods it was possible to observe a dominance of northward bottom water. A comparison between different methods of grain-size analysis (laser and the pipetting technique), revealed that both characterize the interglacial and glacial periods. The spectral analyzes showed a strong signal in the Sortable Silt for the cycles of the eccentricity (~ 100 ka), which was confirmed by the oxygen isotopes and magnetic susceptibility, which presented a similar signal. Concomitant variations in the sortable silt and in the different tracers confirms the potential of the first as a proxy for bottom-current flow intensity.

Nurses experiencing bullying or witnessing other nurses bullied may choose to vacate their hospital positions. Nurse attrition negatively impacts a hospital's bottom line, which can lead to insolvency and a lack of access to healthcare by patients. The purpose of this phenomenological study was to understand the choices nurses made regarding their careers after experiencing or witnessing bullying and to calculate a hospital's cost of loss. Freire's oppressed group theory provided the conceptual framework for the study. The basis of the research questions was to understand how the nurse felt when bullied or observing a coworker bullied, the actions taken, and the financial impact to the hospital. The snowball technique secured 11 RN participants for this phenomenological study with data collection consisting of a demographic questionnaire and semistructured interviews. Data analysis followed Maxwell's plan of initial analysis, transcribing and coding, theme identification, a final coding review, and the final abstraction. The findings in this study demonstrated that based on the lived experiences of the participants, demographics did not influence who or how nurses were bullied; and after leaving the employer, bullied nurses and witnesses displayed various emotions that encompassed nonchalance, anger, tears, or relief. Over half said they would have stayed if they had not been bullied or witnessed it. An additional theme demonstrated that the results of bullying significantly affected a hospital's bottom line in revenue and reputation. Eleven suggestions have been recommended for future studies. Academics, hospital administrators, nurses, and the community at large can use the study findings to effect changes in the hospital environment through conversations, grass-roots efforts, and collaboration.

Abstract: New Orleans, Baltimore, and Charlottesville are reevaluating the presence of Confederate statues in their built environment. Known as the Capital of the Confederacy, Richmond’s cultural landscape is visible through the connection of two historical spaces, Monument Avenue and Shockoe Bottom. Both serve as a powerful case study for how the commemorative narrative of these spaces is contested today and how barriers that exist influence urban planning processes and outcomes.

This study investigated the effectiveness of the READ 180 balanced literacy program in addressing the problem of low reading achievement among urban minority high school students. Research has shown low reading achievement to negatively impact academic and economic success. Holdaway's theory of natural literacy, which suggests reading instruction should be purposeful and realistic, supports READ 180 as a remedial intervention. The specific purpose of the study was to evaluate READ 180 in relation to improving classroom reading achievement, standardized language arts test scores, and graduation rates among students in a low-income, high-minority urban high school. Subjects were 2 cohorts of students consisting of 619 enrolled in READ 180 during the school year of 2007-2008 and 358 students enrolled in READ 180 during the school year of 2010-2011 at an urban high school in New Jersey. Following a goals-based program evaluation design, a paired difference t test was used to evaluate classroom reading achievement; a chi-square test was used to evaluate graduation rates; and a multiple regression analysis controlling for initial status was used to evaluate performance on the standardized language arts test. Findings indicated moderate improvement in classroom reading achievement, no improvement in graduation rates, and strong improvement in standardized test scores only for English learners. Results suggested that a balanced literacy program such as READ 180 may provide effective reading remediation for English learners in low-income urban areas, thereby promoting social change through increased academic success and upward economic mobility.

The alluvial forms of the rivers that drain the Colorado Plateau are a product of the water and sediment load that tributaries deliver to the trunk streams. Where the Green and Colorado Rivers cross structural barriers, narrow canyons have been incised. In the steep terrain adjacent to many of these canyons debris flows occur in the catchment basins of tributaries and deliver coarse sediment to the mainstem river corridor. Over time, debris flow deposits have aggraded in trunk stream valleys and created landforms known as debris fans. The sizes of these debris fans are related to the accommodation space available for fan formation. Lithologic variation in the layer-cake stratigraphy of the Colorado Plateau has led to varying valley widths. Tributary catchment, debris fan, depositional site, and mainstem river characteristics are examined over the 156-kilometer reach of the Green River through Desolation and Gray Canyons. Desolation and Gray Canyons provide some of the widest valley widths and resultant debris fan areas on the Colorado Plateau.

The need for assessment of benthic habitat characteristics may arise for many reasons. Such reasons may include but are not limited to, habitat mapping, environmental concerns and identification of submerged aquatic vegetation. Oftentimes, such endeavors employ the use of aerial photography, satellite imagery, diving transects and extensive sampling. Aerial photography and remote sensing techniques can be severely limited by water clarity and depth, whereas diver transects and extensive sampling can be time consuming and limited in spatial extent. Acoustic methods of seabed mapping, such as the acoustic sediment classification system QTC are not hampered by water clarity issues. The acoustic sediment classification system QTC is capable of providing greater spatial coverage in fractions of the time required by divers or point sampling. The acoustic classification system QTC VIEW VTM was used to map benthic habitats within Tampa Bay. The QTC system connected in parallel to an echo-sounder is capable of digitally extracting and recording echoes returning from the seabed. Recorded echoes were processed using QTC IMPACTTM software. This software partitions echo waveforms into groups or classes based on their similarity to one another using multivariate statistics, namely Principal Component Analysis and K-Means clustering. Data was collected at two frequencies, 50 kHz and 200 kHz. Side-scan sonar data was collected coincident with the QTC data and used to produce mosaics of the various habitats in Tampa Bay. Side-scan sonar data was classified using QTC SideviewTM in an attempt to identify changes in benthic habitats. Sediment samples used for ground-truth were subjected to grain size analysis. Also, the percentage of organic matter and carbonate within samples was determined. Results of acoustic classification appear to accurately reflect changes in the sediment type and structure of the seabed. Grain size, particularly percent mud, appears to have a strong influence on classification. Carbonate hard bottom habitats were found to be acoustically complex, a characteristic useful for their identification. The QTC system was able to detect seagrass, although some misclassification occurred between vegetated and non-vegetated seabeds.

Urban water utilities in the United States face challenges due to a combination of external drivers. These include urbanization and population growth, which are stressing a system of aging infrastructure. Compliance with increasing regulations is also a challenge in a fiscally-constrained economic environment. A changing climate threatens infrastructure and past assumptions for water supply and quality. Urban utilities provide clean water and sanitation services to over 80% of the country’s population and its industrial centers. Therefore, the sustainability of these water utilities are crucial to the country’s and the public’s well-being. New operating models are emerging for a “utility of the future.” Future utilities will recover resources, reduce their overall environmental impact, partner in the local economy, and deliver watershed-wide benefits to improve quality of life. These are all elements of a sustainable utility, but the sector has not agreed upon an applicable definition of sustainability, which intuitively incorporates an inter-generational approach to utility operations. For the purposes of this research, a sustainable utility is defined as one that will provide its crucial services for current and future generations, protect public and environmental health, and enable economic growth, all while minimizing resource consumption. Previous research provided little guidance on the most important sustainable practices for U.S. urban water utilities or the key attributes of those utilities that enable the shift toward sustainability. Additionally, the practice of sustainability measurement, and the closely-related practice of performance measurement, has not been widely adopted in the U.S. water sector. This research program addressed the challenge of providing guidance on, and measurement of, sustainability by developing a framework to quickly and quantitatively assess a utility’s sustainability and key organizational attributes. A mixed methods approach to this research used qualitative and quantitative methodologies. The approach utilized accepted anthropological methods to assess engineering and business concepts at water utilities. Data originated from semi-structured interviews of an external advisory committee of 12 widely-recognized, progressive, U.S. water utility leaders along with online surveys of water utility professionals. The analyzed data revealed the most important sustainable practices for sustainable utilities and organizational attributes that enable the shift toward sustainable operations. Practices are actionable, quantitative, and in some cases, unique to the water sector. Attributes are generally qualitative; largely controlled by internal decisions and actions; and influence a utility’s ability to operate sustainably. Datasets for sustainable practices and organizational attributes were generated using the techniques of discourse analysis on the semi-structured interview transcripts and freelisting on the online survey results. Top results from each dataset were cross-compared to generate the final, consolidated list of top practices and attributes. A sustainability index was developed from the top eight sustainable practices, measured via a total of 14 indicators. Indices were tailored to water, wastewater, and combined utilities. The top sustainable practices were: Education and Communication; Financial Management; Green Infrastructure; Habitat/Watershed Protection; Long-term Resource Plan; Resource Recovery; and Water Conservation. These eight practices provided sufficient coverage of the economic, social, environmental, and infrastructure components of the triple bottom line-plus concept used to frame sustainability for this research. This research also established the top six organizational attributes that enable the shift toward sustainability. These attributes were: Board Support / Political Will; Flexible Staff; Innovative Culture; Leadership; Organizational Commitment; and Staff Training / Development. These six attributes were assessed via a total of seven indicators, with guidance and scaling similar to the practices for ease of use by the end user. Current sustainability and performance measurement frameworks were analyzed for indicators and measurement approaches that matched the top practices and attributes. Some of the practices and only one of the six attributes matched an existing framework. When there was a match, the existing assessment was used to help with ease of use. In other cases, new indicators, guidance, and scaling (for assessment) were developed. Practices and attributes without a match suggests these aspects of sustainable utilities are relatively new to the sector, or at least, measurement of these practices and attributes is not widespread. The practices and attributes were combined into the final framework, a survey tool, which was pilot tested with three water utilities. The pilot testing demonstrated that the survey was comprehensive, yet at the same time, concise enough that it could be completed in under two hours by a limited number of utility staff. The application of this framework to a representative sample of U.S. urban water utilities can generate data to establish which attributes correlate to sustainable utilities. This will help utilities focus their limited resources on attributes which are shown to enable the shift toward sustainability.

[Truncated abstract] Spatially explicit marine habitat data is required for effective resource planning and management across large areas, although mapped boundaries typically lack rigour in explaining what factors influence habitat distributions. Accurate, quantitative methods are needed. In this thesis I aimed to assess the utility of ecological models to determine what factors limit the spatial extent of marine habitats. I assessed what types of modeling methods were able to produce the most accurate predictions and what influenced model results. To achieve this, initially a broad scale marine habitat survey was undertaken in the Recherche Archipelago, on the south coast of Western Australia using video and sidescan sonar. Broad and more detailed functional habitats types were mapped for 1054km2 of the Archipelago. Broad habitats included high and low profile reefs, sand, seagrass and extensive rhodolith beds, although considerable variation could be identified from video within these broad types. Different densities of seagrass were identified and reefs were dominated by macroalgae, filter feeder communities, or a combination of both. Geophysical characteristics (depth, substrate, relief) and dominant benthic biota were recorded and then modelled using decision trees and a combination of generalised additive models (GAMs) and generalised linear models (GLMs) to determine the factors influencing broad and functional habitat variation. Models were developed for the entire Archipelago (n=2769) and a subset of data in Esperance Bay (n=797), which included exposure to wave conditions (mean maximum wave height and mean maximum shear stress) calculated from oceanographic models. Additional distance variables from the mainland and islands were also derived and used as model inputs for both datasets. Model performance varied across habitats, with no one method better than the other in terms of overall model accuracy for each habitat type, although prevalent classes (>20%) such as high profile reefs with macroalgae and dense seagrass were the most reliable (Area Under the Curve >0.7). ... This highlighted not only issues of data prevalence, but also how ecological models can be used to test the reliability of classification schemes. Care should be taken when mapping predicted habitat occurrence with broad habitat models. It should not be assumed that all habitats within the type will be defined spatially, as this may result in the distribution of distinctive and unique habitats such as filterfeeders being underestimated or not identified at all. More data is needed to improve prediction of these habitats. Despite the limitations identified, the results provide direction for future field sampling to ensure appropriate variables are sampled and classification schemes are carefully designed to improve descriptions of habitat distributions. Reliable habitat models that make ecological sense will assist future assessments of biodiversity within habitats as well as provide improved data on the probability of habitat occurrence. This data and the methods developed will be a valuable resource for reserve selection models that prioritise sites for management and planning of marine protected areas.

Social pressure for sustainability has become a significant factor in Australian business. Made popular by a variety of diverse social movements that employ various tactics, sustainability is increasingly being debated in boardrooms and work areas of both large and small businesses. In this research, sustainability issues are treated as a set of a wider range of obligatory and externally imposed (OEI) issues that are increasingly confronting contemporary business. Of interest to this research is how senior managers deal with sustainability issues. While some businesses excel in dealing with OEI issues, others prevaricate. This research focuses on those businesses that appear to excel in resolving sustainability issues to explore how senior managers deal with sustainability issues. Such understanding is essential for contemporary practising senior managers, as it provides guidance for management behaviour that will enable sustainability and other OEI issues to be dealt with. The author's effort to understand how senior managers deal with sustainability issues has led to the first business context application of Harré's positioning theory. A social constructionist approach, positioning theory is concerned with ordinary conversations, and presumes that these are the building blocks of all other discursive phenomena. The resulting theory builds on positioning theory and provides a point of departure to conduct related research on other organizations that excel in dealing with OEI issues and those that prevaricate. With positioning theory it has been shown that, in dealing with sustainability issues, senior managers engage in a range of positioning of themselves and others. In doing so, power and knowledge have been considered in the light of Foucault's unique and penetrating concepts. This has led to the proposed augmentation of positioning theory to include a concept of social flux, which is put forward as an indication of social order or culture. Through this development, it has shown how senior managers confront opposition and reinforce support to enable them to achieve and preserve sustainability objectives. In practical terms, senior managers alter four components of the social order to align the culture with the issues that need to be dealt with. These components - rights, duties, morals and actions - are parameters that senior managers tune or level when they deal with sustainability issues. When the social order is appropriately tuned or levelled, it is aligned with the issues that need to be dealt with. That alignment enables issues to be resolved in a way appropriate for the organization.

Wave-formed rippled sediment beds are extremely important to the processes that act on or across the sediment-water interface. Ripples increase the exchange of materials between the sediment and the water column, enhance sediment transport rates, and act to increase the dissipation of waves by increasing the hydraulic roughness of the seafloor. Previous research has, however, failed to take into account the substantial spatial and temporal variation rippled beds display when formed under real sea conditions. Based on a set of laboratory experiments a spectral method to predict and model rippled beds has been developed. Through the use of the rippled surface's spectral density function the spatial and temporal variability of the rippled surface can be taken into account with greater efficiency. A prediction method for the equilibrium ripple spectrum was developed based on a nondimensional spectral form, which utilised the peak orbital excursion diameter and the 50th percentile grain size diameter of the sediment bed. The method provided an effective technique to predict ripple parameters with the same degree of accuracy achievable at small scale as more accepted ripple prediction methods. A new method was derived to model the changes a rippled bed undergoes as it actively evolves between two given equilibrium states due to a change in surface wave conditions. The evolution of a rippled bed can be described mathematically in exactly the same way as a rippled bed growing from a flat bed condition. The method allows any bed to be modelled through time if the flow conditions and sediment properties are known. There is little advantage in using the spectral method to predict rippled beds when they are in equilibrium with the flow conditions. The main benefit of the spectral method comes when attempting to model rippled beds evolving under changed flow conditions. In the same way as the parameterisation of surface waves in terms of their spectral density function has increased the ability to model wind generated wave fields, studies of rippled beds would benefit from the increased detail and ease the spectral method brings. / Thesis (Ph.D.)--School of Civil and Environmental Engineering, 2005.