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Search Results: 1 - 10 of 6462 matches for " Sarah Wyatt "
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Inexact Solves in Interpolatory Model Reduction
Christopher A. Beattie,Serkan Gugercin,Sarah Wyatt
Mathematics , 2010, DOI: 10.1016/j.laa.2011.07.015
Abstract: We investigate the use of inexact solves for interpolatory model reduction and consider associated perturbation effects on the underlying model reduction problem. We give bounds on system perturbations induced by inexact solves and relate this to termination criteria for iterative solution methods. We show that when a Petrov-Galerkin framework is employed for the inexact solves, the associated reduced order model is an exact interpolatory model for a nearby full-order system; thus demonstrating backward stability. We also give evidence that for $\h2$-optimal interpolation points, interpolatory model reduction is robust with respect to perturbations due to inexact solves. Finally, we demonstrate the effecitveness of direct use of inexact solves in optimal ${\mathcal H}_2$ approximation. The result is an effective model reduction strategy that is applicable in realistically large-scale settings.
Model Reduction of Descriptor Systems by Interpolatory Projection Methods
Serkan Gugercin,Tatjana Stykel,Sarah Wyatt
Computer Science , 2013, DOI: 10.1137/130906635
Abstract: In this paper, we investigate interpolatory projection framework for model reduction of descriptor systems. With a simple numerical example, we first illustrate that employing subspace conditions from the standard state space settings to descriptor systems generically leads to unbounded H2 or H-infinity errors due to the mismatch of the polynomial parts of the full and reduced-order transfer functions. We then develop modified interpolatory subspace conditions based on the deflating subspaces that guarantee a bounded error. For the special cases of index-1 and index-2 descriptor systems, we also show how to avoid computing these deflating subspaces explicitly while still enforcing interpolation. The question of how to choose interpolation points optimally naturally arises as in the standard state space setting. We answer this question in the framework of the H2-norm by extending the Iterative Rational Krylov Algorithm (IRKA) to descriptor systems. Several numerical examples are used to illustrate the theoretical discussion.
Isoperimetric Regions in $\mathbb{R}^n$ with density $r^p$
Wyatt Boyer,Bryan Brown,Gregory R. Chambers,Alyssa Loving,Sarah Tammen
Mathematics , 2015,
Abstract: We show that the unique isoperimetric hypersurfaces in $\mathbb{R}^n$ with density $r^p$ for $n \ge 3$ and $p>0$ are spheres that pass through the origin.
New localities and altitudinal records for the snakes Oxyrhopus petolarius, Spilotes pullatus, and Urotheca fulviceps in Talamanca, Costa Rica
González-Maya, José F.;Cardenal-Porras, Josue;Wyatt, Sarah A.;Mata-Lorenzen, Juan;
Revista mexicana de biodiversidad , 2011,
Abstract: distribution records are the basis for conservation planning and species conservation assessments. new locality and elevation records are reported for 2 dipsadid snakes (oxyrhopus petolarius and urotheca fulviceps) and 1 colubrid (spilotes pullatus) from the talamanca mountain range of costa rica as established by direct sightings. these new records represent important additions to the knowledge of the species and more generally for the talamanca ecoregion.
New localities and altitudinal records for the snakes Oxyrhopus petolarius, Spilotes pullatus, and Urotheca fulviceps in Talamanca, Costa Rica Nuevas localidades y registros de elevación de las serpientes Oxyrhopus petolarius, Spilotes pullatus y Urotheca fulviceps en Talamanca, Costa Rica
José F. González-Maya,Josue Cardenal-Porras,Sarah A. Wyatt,Juan Mata-Lorenzen
Revista mexicana de biodiversidad , 2011,
Abstract: Distribution records are the basis for conservation planning and species conservation assessments. New locality and elevation records are reported for 2 dipsadid snakes (Oxyrhopus petolarius and Urotheca fulviceps) and 1 colubrid (Spilotes pullatus) from the Talamanca mountain range of Costa Rica as established by direct sightings. These new records represent important additions to the knowledge of the species and more generally for the Talamanca ecoregion. Los registros de distribución de especies son la base para la planificación y evaluación del estado de conservación de éstas y los ecosistemas en que habitan. Se presentan 3 nuevas localidades y registros de elevación de 2 especies de dipsádidos (Oxyrhopus petolarius y Urotheca fulviceps) y 1 especie de colúbrido (Spilotes pullatus) en la cordillera de Talamanca, con base en observaciones directas. Estos registros representan importantes adiciones tanto para la ecoregión de Talamanca, como para el aumento significativo en el conocimiento de estas especies.
Do-it-yourself-Design von Lehrmaterialien für den Englisch-Unterricht Becoming a Do-it-yourself Designer of English Language Teaching Materials Convertirse en un dise ador "hágalo usted mismo" de materiales para la ense anza del idioma inglés
Mark Wyatt
Forum : Qualitative Social Research , 2010,
Abstract: Sehr viele Lehrer/innen, die Sprachen unterrichten, erstellen selbst Materialien zus tzlich zu denen, die sie im Haus erhalten, um den Bedarf von Lernenden in den je spezifischen Kontexten bestm glich zu adressieren. Dies erfordert Praxiswissen unterschiedlichster Art, die die Person der Lernenden, Fragen des Spracherwerbs, des Unterrichtens und des Designs von Materialien betreffen. Obwohl vermehrt Forschung zu Sprachunterricht stattfindet, wird der Frage, wie Lehrer/innen ihr Material entwerfen, bisher wenig Beachtung geschenkt, und es fehlen insbesondere l ngsschnittliche Perspektiven. In diesem Beitrag geht es mir um Entwicklungsprozesse eines Lehrers als "Do-it-yourself-Designer" von Materialien für den Englischunterricht im Rahmen des "BA TESOL"-Programms, ein Programm für den Englisch-Unterricht mit Nicht-Muttersprachler/innen im Mittleren Osten. Im Rahmen einer qualitativen Einzelfallstudie, die ich im Folgenden vorstelle, habe ich mich über drei Jahre mit den Konzepten dieser Lehrers und der Umsetzung in der Unterrichtspraxis befasst. Implikationen für den Sprachunterricht werden am Ende diskutiert. URN: http://nbn-resolving.de/urn:nbn:de:0114-fqs1101334 Many language teachers around the world design materials to supplement those they are provided with to address the needs of the learners in their particular context. This is a task which requires practical knowledge of various kinds relating to learners and language learning, teaching and materials design. However, while there is a growing body of research into the practical knowledge of language teachers, little of this is longitudinal and there is a lack of research into how teachers develop as materials designers. This article focuses on one teacher's growth as a DIY (do-it-yourself) designer of English language teaching materials during an in-service BA TESOL (teaching English to speakers of other languages) programme in the Middle East. Using qualitative case study methodology, I follow the teacher's development over three years, exploring changes in ideas and teaching practices. Implications for in-service language teacher education are discussed. URN: http://nbn-resolving.de/urn:nbn:de:0114-fqs1101334 Muchos profesores de idiomas alrededor de mundo dise an materiales para complementar aquellos que se proporcionan para satisfacer las necesidades de los alumnos en su contexto particular. Esta es una tarea que requiere conocimiento práctico de varios tipos, relacionado a los alumnos y al aprendizaje de idiomas, a la ense anza y al dise o de materiales. Sin embargo, si bien existe un cuerpo
E-Publishing Today
Wyatt, Deborah
Australian Journal of Emerging Technologies and Society , 2003,
Abstract: Publishers traditionally draw on a number of services and skills to create books and journals, including: (i) commissioning and (in the case of academic texts) peer review; (ii) editing and proofreading; (iii) design and typesetting; (iv) printing; (v) sales and marketing; and (vi) warehousing and distribution. The aim of the present study was to analyse the impact that e-publishing technology has already had on each of these areas and the extent to which traditional approaches to publishing may change in the future. This includes an overview of hypertext both fictional and non-fictional and a broad historical analysis of the reaction that publishers and booksellers have had to e-publishing to date. Drawing on this overview, the main section of this review consists of a tour through the publishing process, balancing the merits and pitfalls of e-publishing s effect on each of the aforementioned stages. The concluding section offers some conclusions and recommendations, based on the results of this study. For the purposes of this study, the term e-publishing was used to describe the provision of any text in an electronic format from hyperlinked websites to CD ROMs to read-only PDF files although it was most often used to describe e-books (read through PDAs) and websites. based services.
Discourse Coalitions and Consumer Understanding of Organic and Pesticide Free Vegetables in Chiang Mai, Thailand
Brett Wyatt
Asian Social Science , 2010, DOI: 10.5539/ass.v6n3p92
Abstract: This paper will demonstrate how discourse coalitions promote and institutionalize regulations, communicating the meanings of certified, alternative agricultural production processes through the labeling of vegetable produce. This analysis introduces the concepts of discourse coalitions as a way to evaluate the power and linkages constituting an alternative agricultural commodity network. The actors constituting these networks will be shown to work as coalitions of actors promoting complementary and competing discursive strategies explains the role of consumer understanding in completing the commodity network. Data for this analysis was derived from a survey instrument used to determine the attitudes and propensities toward the purchase of conventional and alternative vegetables of 324 consumers in the city of Chiang Mai, Thailand Discourse coalitions are responsible for enacting the relationship between regulatory practice, method of certification, and labeling practices. Effective communication of regulatory practices used in certification can be seen by the level of trust consumers have in the marketplaces and labeling.
South African National Wetlands Awareness Campaign
Wyatt J.
IUCN Otter Specialist Group Bulletin , 1992,
Abstract:
Science and technology: socialising what for whom?
Sally Wyatt
JCOM : Journal of Science Communication , 2009,
Abstract: In the Handbook on the socialisation of scientific and technological research, edited by Wiebe Bijker and Luciano d’Andrea, ‘socialisation’ is used to both describe and prescribe the ways in which science and technology are used in society. In this comment, ‘socialisation’ is discussed from two other points of view. First, the ways in which science and technology are sometimes used to organize, structure and dominate the social are identified. Second, drawing on Merton’s norms of science, an argument is made against over-socialising science and in favour of acknowledging and preserving the ‘special’ nature of science, for its own sake and because, at its best, science can offer an alternative model for other social activities.
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