124 research outputs found

    The Promise and Pitfalls of the New Voting Rights Act

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    In the summer of 2006, Congress reauthorized the expiring provisions of the Voting Rights Act (VRA) with a unanimous vote in the Senate and with limited opposition in the House of Representatives. The veneer of bipartisanship that outsiders perceived in the final vote glossed over serious disagreements between the parties over the meaning of the central provision of the new VRA, which prohibits voting laws that "diminish the ability" of minority citizens "to elect their preferred candidates of choice." Those disagreements came to the surface in a fractured Senate Committee Report released only after Congress had passed the law. This Article describes the unprecedented legislative history of this law, and the political and constitutional constraints that led the law to take the form that it did. It also presents an interpretation of the new retrogression standard that avoids the partisan bias of alternatives while emphasizing the importance of racially polarized voting to the constitutionality and meaning of this new law. It urges that the new law be read as preventing redistricting plans that reduce the aggregated probability across districts of the election of candidates preferred by the minority community and disfavored by whites

    Building dynamic thermal model calibration using the Energy House facility at Salford

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    Thermal modelling tools have widely been used in the construction industry at the design stage, either for new build or retrofitting existing buildings, providing data for informed decision-making. The accuracy of thermal models has been subject of much research in recent decades due to the potential large difference between predicted and ‘in-use’ performance – the so called ‘performance gap’. A number of studies suggested that better representation of building physics and operation details in thermal models can improve the accuracy of predictions. However, full-scale model calibration has always been challenging as it is difficult to measure all the necessary boundary conditions in an open environment. Thus, the Energy House facility at the University of Salford – a full-sized end terrace house constructed within an environmental chamber – presents a unique opportunity to conduct full-scale model calibration. The aim of this research is to calibrate Energy House thermal models using various full-scale measurements. The measurements used in this research include the co-heating tests for a whole house retrofit case study, and thermal resistance from window coverings and heating controls with thermostatic radiator valves (TRVs). Thermal models were created using an IESVE (Integrated Environment Solutions Virtual Environment). IESVE is a well-established dynamic thermal simulation tool widely used in analysing the dynamic response of a building based on the hourly input of weather data. The evidence from this study suggests that thermal models using measured U-values and infiltration rates do perform better than the models using calculated thermal properties and assumed infiltration rates. The research suggests that better representations of building physics help thermal models reduce the performance gap. However, discrepancies still exist due to various other underlying uncertainties which need to be considered individually with each case. In relative terms, i.e., variations in percentage, the predictions from thermal models tend to be more reliable than predicting the absolute numbers
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