Rotten potatoes: redefining perceptions and integrating the police station in city and suburban

Living in a country plagued by high crime rates and negative perceptions of the South African Police Service, South Africans are relying more and more on devices such as siege architecture and fortification to attain a sense of safety and security. However, these fortified enclaves do not just provide people with a sense of safety, they also serve as manifestations of Apartheid memory: intensifying segregation and ‘othering’, discouraging the growth of community and working against the development of healthy and inspiring civic spaces. At the same time, society’s obsession with police criminality, intensified by the influence of the media, has made policing one of the most contentious topics in post-Apartheid South Africa. Consequently, the relationship between the police – the state’s strong-arm of power – and the people is fragile, tense, and unpredictable, symptomatic of the palpable divide that separates the state and the people, a divide which is reinforced by a lack of spatial justice and a relic architecture which neither the state nor the people can identify with. As a tangible tool of cultural expression and a discourse of time and place, architecture embodies a nation’s shared history, its present, and its future aspirations. Architecture is also fundamental to the cause of change, serving as a catalyst and an interface through which the divide between the state and its people may be reconciled. However, the police station as an institutional building – a social incubator – remains apathetic to the ‘everyday’. This archetype demands a drastic rethinking of both parti and contextual setting. Such a reform could potentially transform the police station into an integral, effective, and active facilitator of relationships and make possible the goal of ‘community policing’

A theoretical and experimental study of propellant combustion phenomena during rapid depressurization Final report

Modified solid propellant combustion model for steady state analyses of burning rate and flame temperatur

Evaluation of Nitrate Contamination in Major Porous Media Aquifers in Texas

This study aimed to evaluate the factors influencing nitrate contamination in major porous media aquifers across Texas by analyzing groundwater nitrate concentration data alongside nitrogen loading and aquifer susceptibility parameters. Attributes related to nitrogen loading included atmospheric deposition, fertilizers, land use, sewage and septic input proxies, population density, precipitation, and irrigation. Aquifer susceptibility attributes included land surface slope, soil drainage, clay content, and organic matter content. Multivariate logistic regression was employed to assess the probability of nitrate concentrations exceeding 4 mg/L nitrate-N in shallow wells (≤ 30 m) based on these variables. The final regression model incorporated precipitation, percentage of agricultural land, low-density residential land, and soil organic matter. Observed and predicted probabilities of elevated nitrate concentrations showed strong correlation in both calibration and validation datasets. The inverse relationship between precipitation and nitrate concentration may indicate dilution in high precipitation areas and possible evapoconcentration in low precipitation areas. While nitrate loading was not explicitly included in the model, agricultural land percentage served as a proxy for nitrogen loading from agricultural sources, and low-density residential land use served as a proxy for septic tank effluent. The percentage of organic matter may reflect denitrification in certain regions. This GIS and logistic regression analysis offers valuable insights into the factors influencing nitrate concentrations in groundwater. Future studies should complement this analysis with field sampling to validate the GIS and logistic regression findings and assess the impact of processes like dilution and denitrification on nitrate concentrations.Bureau of Economic Geolog

A non-intrusive nonlinear aeroelastic extension of loads packages with application to long range transport aircraft configuration

A new method for constructing geometrically-nonlinear aeroelastic systems from standard linear models is applied to an industry-level aircraft configuration. The new approach seamlessly integrates with current aeroelastic load packages performing linear analysis based on generic finite-element models (FEMs) and aerodynamic influence coefficient matrices (AICs). We generalize the methodology to incorporate control inputs, find the trimmed aircraft state, or generate gusts disturbances, which can be employed separately or combined to obtain a simplified flight dynamics model for load analysis. An initial study of the aeroelastic response of a long range aircraft is presented. Linear and nonlinear results are introduced in static and dynamic computations of manoeuvres, trim, and gust disturbances. These are compared to commercial software calculations, showing the need for geometrically nonlinear analysis in the production environment of airplanes with ultra high aspect ratio wings

Antagonisms, mutualisms and commensalisms affect outbreak dynamics of the southern pine beetle

Feedback from community interactions involving mutualisms are a rarely explored mechanism for generating complex population dynamics. We examined the effects of two linked mutualisms on the population dynamics of a beetle that exhibits outbreak dynamics. One mutualism involves an obligate association between the bark beetle, Dendroctonus frontalis and two mycangial fungi. The second mutualism involves Tarsonemus mites that are phoretic on D. frontalis ( commensal ), and a blue-staining fungus, Ophiostoma minus. The presence of O. minus reduces beetle larval survival ( antagonistic ) by outcompeting beetle-mutualistic fungi within trees yet supports mite populations by acting as a nutritional mutualist. These linked interactions potentially create an interaction system with the form of an endogenous negative feedback loop. We address four hypotheses: (1) Direct negative feedback: Beetles directly increase the abundance of O. minus, which reduces per capita reproduction of beetles. (2) Indirect negative feedback: Beetles indirectly increase mite abundance, which increases O. minus, which decreases beetle reproduction. (3) The effect of O. minus on beetles depends on mites, but mite abundance is independent of beetle abundance. (4) The effect of O. minus on beetles is independent of beetle and mite abundance. High Tarsonemus and O. minus abundances were strongly correlated with the decline and eventual local extinction of beetle populations. Manipulation experiments revealed strong negative effects of O. minus on beetles, but falsified the hypothesis that horizontal transmission of O. minus generates negative feedback. Surveys of beetle populations revealed that reproductive rates of Tarsonemus, O. minus, and beetles covaried in a manner consistent with strong indirect interactions between organisms. Co-occurrence of mutualisms embedded within a community may have stabilizing effects if both mutualisms limit each other. However, delays and/ or non-linearities in the interaction systems may result in large population fluctuations. © Springer-Verlag 2005

Management of Hypertensive Emergencies in Pediatrics

As hypertension becomes more prevalent in the pediatric population, clinicians are more likely to encounter hypertensive emergencies in children, which require pharmacists and physicians to be educated on the therapeutic options for these emergencies. However, the strict governmental requirements on the testing of these drugs in pediatric patients have limited the amount of available evidence on which to base clinical decisions. This review will highlight the available evidence and preferred treatment options for the management of pediatric hypertensive emergencies