Simulación mediante modelos analíticos de estela en parques eólicos y validación con mediciones del parque eólico Rawson

Cuando el aire fluye a través de una turbina eólica y se extrae energía del flujo, este se desacelera (región de estela). En parques eólicos, la reducción de la velocidad del viento en la estela genera una pérdida en la producción de las turbinas aguas abajo. Una parte importante de los pronósticos de potencia eólica es evaluar los efectos de estela. Existen distintos métodos para simular este efecto; los modelos analíticos son los utilizados en pronósticos operativos de potencia por ser económicos en cuanto a recursos computacionales. El objetivo de este trabajo fue implementar un modelo analítico, distintos métodos de superposición de estelas y comparar los resultados con simulaciones CFD y mediciones del parque operativo Rawson. Se encontró que el modelo analítico gaussiano reproduce correctamente el déficit en la estela y que el método de superposición cuadrático es el que mejor aproxima las mediciones cuando se modela un parque.When the air flows through a wind turbine and energy is extracted from the flow, the air decelerates (wake region). In wind farms, the reduction of the wind speed in the wake generates a loss in the production of the turbines downstream. An important part of wind power forecasts is to evaluate wake effects. There are different methods to simulate this effect; analytical models are those used in operational power forecasts because they are economical in terms of computational resources. The aim of this work was to implement an analytical model, different methods of overlapping wakes and compare the results with CFD simulations and measurements of the Rawson operating wind farm. It was found that the gaussian analytical model correctly reproduces the deficit in the wake and that the quadratic superposition method is the one that best approximates the measurements when a wind farm is modeled.Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES

The question is the answer : making the language arts classroom meaningful with essential questions and student-driven inquiry

Coalition research scholar, Grant Wiggins, firmly believes the idea of a question-driven, inquiry approach to teaching and learning should be at the heart of a school\u27s mission. In examining one of the chief questions of a school\u27s mission, that is, \u27What are the aims of a high school curriculum,\u27 Wiggins says it must involve getting students to use their minds well (Cushman, 1989). Wiggins says that, students should emerge from their high school career with an integrated vision of how to think within the culture, which implies a broad understanding, not just narrow or rote expertise (Cushman, 1989). In order for this type of curriculum to essentially \u27work\u27 in schools, classroom teachers, professional development leaders, and English educators must develop a similar, question-driven professional development plan. Because the process of classroom inquiry is difficult to sustain when individual teachers are working alone, the field of English education needs to foster communities of inquiry. Professional growth and educational change become most possible when groups of teachers come together to reflect, to question, and to devise a collective course of action (Buehler, 2005, p. 286). In a professional development environment built around growth and change, an inquiry based curriculum has the power to transform curriculum

The neutron-capture and α-elements abundance ratios scatter in old stellar populations: cosmological simulations of the stellar halo

We investigate the origin of the abundance ratios and scatter of the neutron-capture elements Sr, Ba, and Eu in the stellar halo of a Milky Way-mass galaxy formed in a hydrodynamical cosmological simulation, and compare them with those of α elements. For this, we implement a novel treatment for chemical enrichment of Type II supernovae that considers the effects of the rotation of massive stars on the chemical yields and differential enrichment according to the life-times of progenitor stars. We find that differential enrichment has a significant impact on the early enrichment of the interstellar medium which is translated into broader element ratio distributions, particularly in the case of the oldest, most metal-poor stars. We find that the [element/Fe] ratios of the α-elements O, Mg, and Si have systematically lower scatter compared to the neutron-capture elements ratios Sr, Ba, and Eu at [Fe/H] < -2, which is ~0.1-0.4 dex for the former and between ~0.5 and 1 dex for the latter. The different scatter levels found for the neutron-capture and α-elements is consistent with observations of old stars in the Milky Way. Our model also predicts a high scatter for the [Sr/Ba] ratio, which results from the treatment of the fast-rotating stars and the dependence of the chemical yields on the metallicity, mass, and rotational velocities. Such chemical patterns appear naturally if the different ejection times associated with stars of different mass are properly described, without the need to invoke for additional mixing mechanisms or a distinct treatment of the α- and neutron-capture elements

2016 Oklahoma Research Day Full Program

This document contains all abstracts from the 2016 Oklahoma Research Day held at Northeastern State University

Actor & Avatar: A Scientific and Artistic Catalog

What kind of relationship do we have with artificial beings (avatars, puppets, robots, etc.)? What does it mean to mirror ourselves in them, to perform them or to play trial identity games with them? Actor & Avatar addresses these questions from artistic and scholarly angles. Contributions on the making of "technical others" and philosophical reflections on artificial alterity are flanked by neuroscientific studies on different ways of perceiving living persons and artificial counterparts. The contributors have achieved a successful artistic-scientific collaboration with extensive visual material

Dual Auteurs?: The Case Study of Gordon Hessler and Christopher Wicking

This thesis examines the four American International Pictures horror movies, The Oblong Box (1969), Scream and Scream Again (1970), Cry of the Banshee (1970) and Murders in the Rue Morgue (1971), directed by Gordon Hessler and written by Christopher Wicking between 1969 and 1971, in an effort to discover whether the director and writer were the dual auteurs of these works. The study adopts the philosophy and methodology of the auteur theory as described by Andrew Sarris in his essay, “Some Notes on the Auteur Theory in 1962” (Sarris 2008: 35-45) and modified by Richard Corliss to include his “Synthesis: The Multiple Auteur” in his 1974 book, Talking Pictures (Corliss 1972: xxvii-xxviii). Various drafts of the screenplays for the four movies by Hessler and Wicking have been studied and compared, along with various cuts of the films, interviews, contemporary reviews and critical evaluations. In this way, the author discovers the commercial and artistic evolution of each project in the context of the themes and concerns of the creative team of Hessler and Wicking, discerning whether the writer and director were indeed equal authors of the finished products. This thesis asserts that the movies were not only unique works signalling the end of the world-wide resurgence of gothic cinema in the 1950s and 60s, but personal responses to the genre and the era. The four movies are analysed as the body of work of the writer and director team and compared and contrasted to the films of the other artists who influenced them. The study examines the genre conventions as well as the original innovations of each movie. The author concludes that, despite the comparative critical neglect of these films, they emerge as an important achievement distinguished by an original cinematic style and a unifying vision of the genre and the turbulent times in which they were made

The Smugglers\u27 Landscape: Geography, Route Selection and the Global Heroin Trade

This study focuses on transnational smuggling, and puts forth an analytical framework from the smugglers\u27 perspective with respect to route selection, focusing primarily on aspects of economic, political, and human geography. It is predicated on three interconnected decision-making domains that constitute the smuggler\u27s operational landscape, namely access, risk and connectivity, which interact to drive the smugglers\u27 perceptions of route attractiveness. The first two domains operate reciprocally, primarily at the national level of analysis, and together both shape and are shaped by the third at the transnational level to form a feedback loop. With respect to connectivity, the convention of the smuggling vector is also introduced. As a benchmark commodity, heroin is used to demonstrate the utility of this approach with the primary aim of applying and validating the generic geographic smuggling model, meant to be extensible in terms of space, time and commodity. A review of the literature, focusing on the range of smuggled commodities, the nature and evolution of smuggling actors, the complex relationship between smuggling networks and nation-states, and potential modes of transportation by land, water and air. A discussion of the spatial parameters of the global heroin trade itself, with specific reference to the geography of supply and demand, is also undertaken. For case studies, Afghanistan has been chosen as one of the two largest opium cultivators worldwide, as well as by virtue of its recent and dramatic history. In addition to established cocaine smuggling routes and methods, Colombia has also become a primary heroin source country with respect to the U.S. market. Finally, Nigeria is a known transit hub without being a center of production, demonstrating that factors other than mere proximity can be decisive. Each case study first examines those geographic and historical factors that shape heroin smuggling at the national level, focusing on the themes of terrain, tradition and domestic turmoil, before considering the various sets of smuggling vectors that proceed outward via various modes and points of transit to their final destinations. This methodology not only highlights data gaps inherent in analyzing black markets, but also optimizes extant sources of information

Screen Space Reconfigured

Screen Space Reconfigured is the first edited volume that critically and theoretically examines the many novel renderings of space brought to us by 21st century screens. Exploring key cases such as post-perspectival space, 3D, vertical framing, haptics, and layering, this volume takes stock of emerging forms of screen space and spatialities as they move from the margins to the centre of contemporary media practice.Recent years have seen a marked scholarly interest in spatial dimensions and conceptions of moving image culture, with some theorists claiming that a 'spatial turn' has taken place in media studies and screen practices alike. Yet this is the first book-length study dedicated to on-screen spatiality as such.Spanning mainstream cinema, experimental film, video art, mobile screens, and stadium entertainment, the volume includes contributions from such acclaimed authors as Giuliana Bruno and Tom Gunning as well as a younger generation of scholars

Respawn

In Respawn Colin Milburn examines the connections between video games, hacking, and science fiction that galvanize technological activism and technological communities. Discussing a wide range of games, from Portal and Final Fantasy VII to Super Mario Sunshine and Shadow of the Colossus, Milburn illustrates how they impact the lives of gamers and non-gamers alike. They also serve as resources for critique, resistance, and insurgency, offering a space for players and hacktivist groups such as Anonymous to challenge obstinate systems and experiment with alternative futures. Providing an essential walkthrough guide to our digital culture and its high-tech controversies, Milburn shows how games and playable media spawn new modes of engagement in a computerized world

Wellesley Bulletin [2006-2007]

https://repository.wellesley.edu/catalogs/1104/thumbnail.jp