5 research outputs found
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Demolition Range Noise Abatement Technique Demonstration and Evaluation for the McAlester Army Ammunition Plant
Public concern regarding the effects of noise generated by the detonation of excess and obsolete explosive munitions at U.S. Army demolition ranges is a continuing issue for the Army's demilitarization and disposal groups. Recent concerns of citizens living near the McAlester Army Ammunition Plant (MCAAP) in Oklahoma have lead the U.S. Army Defense Ammunition Center (DAC) to conduct a demonstration and evaluation of noise abatement techniques that could be applied to the MCAAP demolition range. With the support of the DAC, MCAAP, and Sandia National Laboratories (SNL), three types of noise abatement techniques were applied: aqueous foams, overburden (using combinations of sand beds and dirt coverings), and rubber or steel blast mats. Eight test configurations were studied and twenty-four experiments were conducted on the MCAAP demolition range in July of 2000. Instrumentation and data acquisition systems were fielded for the collection of near-field blast pressures, far-field acoustic pressures, plant boundary seismic signals, and demolition range meteorological conditions. The resulting data has been analyzed and reported, and a ranking of each technique's effects has been provided to the DAC
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A comparison of methods for 3D target localization from seismic and acoustic signatures
An important application of seismic and acoustic unattended ground sensors (UGS) is the estimation of the three dimensional position of an emitting target. Seismic and acoustic data derived from UGS systems provide the taw information to determine these locations, but can be processed and analyzed in a number of ways using varying amounts of auxiliary information. Processing methods to improve arrival time picking for continuous wave sources and methods for determining and defining the seismic velocity model are the primary variables affecting the localization accuracy. Results using field data collected from an underground facility have shown that using an iterative time picking technique significantly improves the accuracy of the resulting derived target location. Other processing techniques show little advantage over simple crosscorrelation along in terms of accuracy, but may improve the ease with which time picks can be made. An average velocity model found through passive listening or a velocity model determined from a calibration source near the target source both result in similar location accuracies, although the use of station correction severely increases the location error
Low-Yield Nuclear Testing by North Korea in May 2010: Assessing the Evidence with Atmospheric Transport Models and Xenon Activity Calculations
Social housing and urban renewal: an introduction
Book synopsis: This book offers a cross-national perspective on contemporary urban renewal in relation to social rental housing. Social housing estates – as developed either by governments (public housing) or not-for-profit agencies – became a prominent feature of the 20th century urban landscape in Northern European cities, but also in North America and Australia. Many estates were built as part of earlier urban renewal, ‘slum clearance’ programs especially in the post-World War 2 heyday of the Keynesian welfare state. During the last three decades, however, Western governments have launched high-profile ‘new urban renewal’ programs whose aim has been to change the image and status of social housing estates away from being zones of concentrated poverty, crime and other social problems. This latest phase of urban renewal – often called ‘regeneration’ – has involved widespread demolition of social housing estates and their replacement with mixed-tenure housing developments in which poverty deconcentration, reduced territorial stigmatization, and social mixing of poor tenants and wealthy homeowners are explicit policy goals.
Academic critical urbanists, as well as housing activists, have however queried this dominant policy narrative regarding contemporary urban renewal, preferring instead to regard it as a key part of neoliberal urban restructuring and state-led gentrification which generate new socio-spatial inequalities and insecurities through displacement and exclusion processes. This book examines this debate through original, in-depth case study research on the processes and impacts of urban renewal on social housing in European, U.S. and Australian cities. The book also looks beyond the Western urban heartlands of social housing to consider how renewal is occurring, and with what effects, in countries with historically limited social housing sectors such as Japan, Chile, Turkey and South Africa