5,379 research outputs found

    Notes on the Limitations of Strategic Philanthropy

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    While there are benefits to strategic grantmaking, organizations should beware of taking the trend too far. As Scanlon concludes about the Public Welfare Foundation's adoption of a strictly strategic approach to philanthropy, "We threw the PWF baby -- and many of its best qualities -- out with the bathwater.

    A use of geometric calculus to reduce Berezin integral to the limit of a Riemann sum

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    Berezin integration of functions of anticommuting Grassmann variables is usually seen as a formal operation, sometimes even defined via differentiation. Using the formalism of geometric algebra and geometric calculus in which the Grassmann numbers are endowed with a second associative product coming from a Clifford algebra structure, we show how Berezin integrals can be realized in the high dimensional limit as integrals in the sense of geometric calculus. We then show how the concepts of spinors and superspace transform into this framework.Comment: 34 pages, no figure

    NORSEWInD Data Report and Correction Data for Berlengas : NORSEWInD Report UoSNW026

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    The flow field over Berlengas has been simulated on both a sub scale wind tunnel model in a low speed wind tunnel and in a computational fluid dynamics simulation. The CFD model has been validated by the results of the wind tunnel simulation. A simulation of measurements that would be made by a ZephIR LiDAR mounted on the island has been undertaken using the CFD results A method by which the distortion to the flow field over an offshore platform, measured by either a met mast or LiDAR, can be corrected back to the free stream value has been presented and verified. Correction factors have been calculated and are included in the appendix to this report. Based on the CFD and wind tunnel data it is was evident that significant flow distortion exists up to 425m above the island

    User Defined Function: lidar_3D : NORSEWInD Report UoSNW006

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    This report describes the User Defined Function Lidar_3D used to interrogate FLUENT data files to provide the relevant data for the MathCAD LiDAR simulation program. The UDF was written in the C programming language and compiled using Microsoft visual studio 2008. This report contains a listing of the program (version 1.03). This report contains a description of the methodology required to compile the UDF so that it may be called by an "execute on demand" call from FLUENT. The report also includes a description of the input and output data file formats

    Feasibility Study of using a LiDAR in the complex flowfield of an offshore platform, to measure wind shear profile.

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    Offshore wind is the major growth area in the wind industry sector today. However, there remains a key, fundamental missing element - a thorough understanding of the offshore wind climatology and likely wind resource. In 2008 the EU FP7 funded project NORSEWInD was created with a remit to deliver offshore wind speed data at a nominal project hub height acquired in offshore locations in the North, Baltic and Irish seas. Part of the overall NORSEWInD project was the use of LiDAR remote sensing (RS) systems mounted on offshore platforms to measure wind velocity profiles at a number of locations offshore. The data acquired from the offshore RS measurements was fed into a large and novel wind speed dataset suitable for use by the wind industry. The data was also fed into key areas such as forecasting and MESOSCALE modelling improvements. One significant problem identified was the effect of platform interference effects on the RS data. Therefore, part of the fundamental research incorporated into the NORSEWInD project was an investigation into the possible extent and effect of the interference on the measured data from the various mounting platforms. This paper reports on the Computational Fluid Dynamics (CFD) modelling of the wind flows over the platforms and the verification of the CFD models by the use of sub scale wind tunnel models employing three dimensional Constant Temperature Anemometers (CTAs) to measure local velocity vector data
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