394 research outputs found
Precomputed data accompanying the paper "Reduced Data-Driven Turbulence Closure for Capturing Long-Term Statistics"
No full textTogether with the python code in https://github.com/rik-stra/tau_orthogonal_method_for_2D_turbulence, this dataset lets the user interact with and reproduce the results in the paper "Reduced Data-Driven Turbulence Closure for Capturing Long-Term Statistics"
Uncertainty Modelling in Aircraft Trajectory Predictions
No full textSeveral initiatives are being developed to shift the current paradigm in Air Traffic Management (ATM) from the tactical-based approach to more strategic-based coordination of flights. This transformation of the ATM system relies on the improvement of predictive models that predict the 4D-trajectory of an aircraft. Previous studies primarily applied deterministic models that compute a single predicted trajectory. These models were assessed on their predictive accuracy. However, the accuracy of the predictions is highly impacted by uncertainties that affect the progression of a flight. These uncertainties are commonly related to the lack of detailed information concerning the flight intent, or the inaccuracy of positional and weather-related data. This study applied two probabilistic techniques: the model-based particle filtering model and the data-driven Gaussian Process Regression. Both approaches model the uncertainties and provide a predictive distribution of trajectories that allows for the evaluation of both the accuracy and the uncertainty of the predictions. These models were applied to predict the descent trajectories of aircraft arriving at Amsterdam Airport Schiphol. The results showed that the uncertainty of the predictions could be reduced by incorporating flight-plan data and meteorological data in the predictive models. Also, the accuracy was improved which demonstrates the importance of these sources of data in the predictions of aircraft trajectories. The proposed models have been able to quantify the uncertainty in trajectory predictions that could be used to further develop and improve the management and prediction of 4D-trajectories.Aerospace Engineerin
Report: Complexities of Project Logistics Workshop
No full textOne of the three pre-conference workshops leading up to the ESTS 2016 / DiXiT 3 conference held in Antwerp at the beginning of October was organised by DiXiT and focussed on complexities of project logistics. Workshop under way (photo credit: Pim Verhulst). The workshop was convened by Peter Boot (Huygens ING) and included the following short presentations as a lead-up to an open discussion: Jan Burgers (Huygens ING): Editing Medieval Charters in the Digital Age. Rik Hoekstra (Huygens I..
Report: Complexities of Project Logistics Workshop
No full textOne of the three pre-conference workshops leading up to the ESTS 2016 / DiXiT 3 conference held in Antwerp at the beginning of October was organised by DiXiT and focussed on complexities of project logistics. Workshop under way (photo credit: Pim Verhulst). The workshop was convened by Peter Boot (Huygens ING) and included the following short presentations as a lead-up to an open discussion: Jan Burgers (Huygens ING): Editing Medieval Charters in the Digital Age. Rik Hoekstra (Huygens I..
The Quest for Citations: Drivers of Article Impact
Full text linkWhy do some articles become building blocks for future scholars, while many others remain unnoticed? We aim to answer this question by contrasting, synthesizing and simultaneously testing three scientometric perspectives – universalism, social constructivism and presentation – on the influence of article and author characteristics on article citations. To do so, we study all articles published in a sample of five major journals in marketing from 1990 to 2002 that are central to the discipline. We count the number of citations each of these articles has received and regress this count on an extensive set of characteristics of the article (i.e. article quality, article domain, title length, the use of attention grabbers and expositional clarity), and the author (i.e. author visibility and author personal promotion). We find that the number of citations an article in the marketing discipline receives, depends upon “what one says†(quality and domain), on “who says it†(author visibility and personal promotion) and not so much on “how one says it†(title length, the use of attention grabbers, and expositional clarity). Our insights contribute to the marketing literature and are relevant to scientific stakeholders, such as the management of scientific journals and individual academic scholars, as they strive to maximize citations. They are also relevant to marketing practitioners. They inform practitioners on characteristics of the academic journals in marketing and their relevance to decisions they face. On the other hand, they also raise challenges towards making our journals accessible and relevant to marketing practitioners: (1) authors visible to academics are not necessarily visible to practitioners; (2) the readability of an article may hurt academic credibility and impact, while it may be instrumental in influencing practitioners; (3) it remains questionable whether articles that academics assess to be of high quality are also managerially relevant.Impact;Citation Analysis;Referencing;Scientometrics;Cite
Contested Contest.: Indigenous Perspectives on the Spanish Occupation of Nueva Galicia, 1524-1545,
No full text''''Contested Contest. Indigenous Perspectives on the Spanish Occupation of Nueva Galicia, 1524-1545', by Ida Altman'. 'Latin American Originals 12, Pennsylvania University Press, 2017.
A Colonial Cacicazgo: the Mendozas of Seventeenth-Century Tepexí de la Seda
Full text linkThe cacicazgo, or indigenous lordship, was a pivotal institution in colonial Mexican Indian pueblos. Caciques, or Indian nobles, played a role, both in the largely indigenous world of the pueblo and in the regional economy that was dominated by Spaniards. This subject of this essay is the analysis of the evolution and daily operation and of a cacicazgo from the Indian settlement of Tepexí de la Seda near the city of Puebla de los Ángeles and the life of its caciques in the sixteenth and seventeenth centuries. In the sixteenth century the cacicazgo was in upheaval because of discord between the cacicazgos and their dependent Indians. A number of long-running accounts from the 1620s record in detail the daily operations of the cacicazgo of Doña Ana de Santa Bárbara of the Mendoza family, thus illustrating how caciques negotiated their positions and coped with their lives and the changes in it. Resumen: Un cacicazgo colonial: los Mendoza de Tepexí de la Seda en el siglo 17 El cacicazgo, o señorío indígena, fue una institución fundamental en los pueblos indios de México colonial. Los caciques, o nobles indígenas, desempeñaron un papel tanto en el mundo en gran parte indígena del pueblo y en la economía regional dominada entonces por los españoles. El tema de este ensayo es el análisis de la evolución y operación cotidianas de un cacicazgo del asentamiento indígena de Tepexí de la Seda cerca de la ciudad de Puebla de los Ángeles y la vida de sus caciques en los siglos 16 y 17. En el siglo 16, el cacicazgo vivió tiempos convulsos debido a los conflictos entre los caciques y sus dependientes indios. Varias extensas cuentas de los años veinte del siglo 17 registran en detalle las operaciones diarias del cacicazgo de doña Ana de Santa Bárbara, de la familia Mendoza, mostrando así cómo negociaban los caciques sus posiciones y se adaptaban a los cambios en sus vidas
A Colonial Cacicazgo: the Mendozas of Seventeenth-Century Tepexí de la Seda
Full text linkAbstract: The cacicazgo, or indigenous lordship, was a pivotal institution in colonial Mexican Indian pueblos. Caciques, or Indian nobles, played a role, both in the largely indigenous world of the pueblo and in the regional economy that was dominated by Spaniards. This subject of this essay is the analysis of the evolution and daily operation and of a cacicazgo from the Indian settlement of Tepexí de la Seda near the city of Puebla de los Ángeles and the life of its caciques in the sixteenth and seventeenth centuries. In the sixteenth century the cacicazgo was in upheaval because of discord between the cacicazgos and their dependent Indians. A number of long-running accounts from the 1620s record in detail the daily operations of the cacicazgo of Doña Ana de Santa Bárbara of the Mendoza family, thus illustrating how caciques negotiated their positions and coped with their lives and the changes in it. Keywords: caciques, colonial Mexico, seventeenth century, indigenous elite, ethnohistory. During the transitional situation of the early sixteenth century following the military conquest in highland Mexico, Spaniards and Indians had to find a way to create a more stable and sustainable society. This transition involved a wide range of social and economic interactions that eventually resulted in a new society with a place for both Spaniards and Indians. Instead of the usual picture one imagines of ruthless Spaniards, local authorities and clerics lording it over defeated indigenous peasants, one finds in the documents evidence of indigenous lordships, or cacicazgos that blended indigenous and Spanish social and economic characteristics. The cacicazgo as an institution had developed from the lordly domains as the Indians had known them before the Spaniards arrived. However, in order to survive, the caciques had to adapt to the changing world and participate in the new activities colonial society was creating. The caciques played a pivotal, but evolving role in colonial society on the crossroads of the Spaniards and Indian worlds that, officially, were kept separated in colonial legislation Most studies focus primarily on the landownership relations of rural players such as hacienda-owners, indigenous peasants and caciques. Research is mostly based on lawsuits concerning lands and testaments. The institutional situation was largely settled by laws, vice regal decrees, Indian petitions, and actions of Spanish authorities and lawsuits. Research has also made it clear that throughout Mexico, many indigenous cacique families were able to continue their cacicazgos in the colonial period. However, the inner workings of the cacicazgo remain a largely unexplored terrain, not in the last place because of the shortage of sources. The social position of the cacique was intricate and involved many parties. Nevertheless, it did shape social relations. This essay explores the workings of the cacicazgo of the cacique family of Doña Ana de Santa Bárbara of the pueblo de indios o
Finite Volume Integration of the shallow water equations, applied to the wave behind a submarine
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