1,640 research outputs found
The My Lai Massacre in American history and memory
No full textThis book examines the response of American society to the massacre and its ambiguous place in American national memory. The author argues that the massacre revelations left many Americans untroubled, and it was only when the soldiers most immediately responsible came to be tried that the controversy really came to public attention. He finds that, contrary to interpretations of the Vietnam conflict as an unhealed national trauma or wound, many Americans have assimilated the war and its violence rather too well, and they were able to do so even when that violence was most conspicuous and current. Consistent with the view that US soldiers have subsequently been cast in national culture as the conflict’s principal victims, it was the American perpetrators of the massacre and not the Vietnamese they brutalized who, even in the case of My Lai, became the central object of popular concern
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Hellerstein publishes new edition of State and Local Taxation
No full textDistinguished Research Professor & Shackelford Distinguished Professor in Taxation Law Emeritus Walter Hellerstein published State and Local Taxation, Cases and Materials, 11th ed. (West Academic, 2019) (with K.J. Stark, J.A. Swain & J.M. Youngman)
Hellerstein publishes new edition of State and Local Taxation
No full textDistinguished Research Professor & Shackelford Distinguished Professor in Taxation Law Emeritus Walter Hellerstein published State and Local Taxation, Cases and Materials, 11th ed. (West Academic, 2019) (with K.J. Stark, J.A. Swain & J.M. Youngman)
Thick-bedded deep-marine sandstones: The use of analogs for reservoir appraisal
No full textCivil Engineering and Geoscience
Characterization of deltaic rocks for numerical reservoir simulation
No full textCivil Engineering and Geoscience
Upscaling of permeability heterogeneities in reservoir rocks; an integrated approach
No full textThis thesis presents a hierarchical and geologically constrained deterministic approach to incorporate small-scale heterogeneities into reservoir flow simulators. We use a hierarchical structure to encompass all scales from laminae to an entire depositional system. For the geological models under consideration we propose a five-scale hierarchy with sedimentary structure and subfacies as key elements. The five scales are the lamina, sedimentary structure or bed, subfacies, facies, and depositional system. We use the term subfacies to denote a rock type, i.e. a body of rock with internally consistent sedimentary properties. The term facies denotes an assemblage of subfacies. The depositional system may be thought of as a sequence, i.e. an assemblage of genetically related deposits formed during periods between "catastrophic" events such as an abrupt sea level rise. Although sedimentary architecture is very complicated, the hierarchical approach lends itself naturally to implementation of heterogeneity in a reservoir simulator. For this reason we distinguish flow units, flow cells and grid cells. Flow units are subfacies schematised in a rectangular structure. The building block of the flow unit is a particular type of flow cell. Flow cells are periodic unit cells (PUC) that contain one or more sedimentary structures. The advantage of the assumed periodicity is that PUC's can be used to obtain average flow characteristics over the representative elementary volume (REV) of the flow unit. Such an REV consists of a large collection of PUC's. For flow simulations on the oil field scale we divide the flow units into rectangular grid cells that contain the flow characteristics of the flow cell. The simulations based on SPE 9th comparative program show the importance of incorporating small-scale heterogeneities.Civil Engineering and Geoscience
Permeability heterogeneity in cross-bedded sandstones: Impact on water/oil displacement in fluvial reservoirs
No full textCivil Engineering and Geoscience
The structural, paleogeographical and hydrocarbon systems analysis of the Ghadamis and Murzuq Basins, West Libya, with emphasis on their relation to the intervening Al Qarqaf Arch
No full textCivil Engineering and Geoscience
Toepassing van het caisson-systeem bij het filtergebouw op het terrein van de Centrale Gelderland-Zuid te Nijmegen
No full textBeschrijving van de uitvoering van een caissonfundering
Improving the Evolutionary Optimization of Interplanetary Low-Thrust Trajectories Using a Neural Network Surrogate Model
No full textBuilding on recent advances in the fields of low-thrust trajectory optimization based on shaping methods, Artificial Neural Networks, and surrogate models in Evolutionary Algorithms, an investigation into a novel optimization routine is conducted. A flexible Python tool to evaluate linked trajectories in a two-body model based on hodographic shaping is implemented and used to develop a novel evolutionary optimization approach where a Genetic Algorithm is assisted in finding new candidate solutions by an online surrogate. The algorithm and different surrogate designs are experimentally investigated on two example problems based on the Dawn trajectory and the GTOC2 problem. Employing the surrogate yields new candidate solutions that improve the population’s fitness especially when the surrogate is used to approximate the shaping computation. Additionally, the use of a surrogate pretrained on a general data set of low-thrust transfers is tested and found to considerably improve the initial quality of the model, meaning that more good candidate solutions are found early on, accelerating the algorithm’s convergence.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Astrodynamics & Space Mission
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