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Search Results: 1 - 10 of 224784 matches for " Sarah C. Goslee "
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Analyzing Remote Sensing Data in R: The landsat Package
Sarah C. Goslee
Journal of Statistical Software , 2011,
Abstract: Research and development on atmospheric and topographic correction methods for multispectral satellite data such as Landsat images has far outpaced the availability of those methods in geographic information systems software. As Landsat and other data become more widely available, demand for these improved correction methods will increase. Open source R statistical software can help bridge the gap between research and implementation. Sophisticated spatial data routines are already available, and the ease of program development in R makes it straightforward to implement new correction algorithms and to assess the results. Collecting radiometric, atmospheric, and topographic correction routines into the landsat package will make them readily available for evaluation for particular applications.
The ecodist Package for Dissimilarity-based Analysis of Ecological Data
Sarah C. Goslee,Dean L. Urban
Journal of Statistical Software , 2007,
Abstract: Ecologists are concerned with the relationships between species composition and environmental framework incorporating space explicitly is an extremely flexible tool for answering these questions. The R package ecodist brings together methods for working with dissimilarities, including some not available in other R packages. We present some of the features of ecodist, particularly simple and partial Mantel tests, and make recommendations for their effective use. Although the partial Mantel test is often used to account for the effects of space, the assumption of linearity greatly reduces its effectiveness for complex spatial patterns. We introduce a modification of the Mantel correlogram designed to overcome this restriction and allow consideration of complex nonlinear structures. This extension of the method allows the use of partial multivariate correlograms and tests of relationship between variables at different spatial scales. Some of the possibilities are demonstrated using both artificial data and data from an ongoing study of plant community composition in grazinglands of the northeastern United States.
Cartas y Salones: mujeres que leen y escriben la nación en la Sudamérica del siglo XIX
Sarah C. Chambers
Araucaria , 2005,
Abstract: Este ensayo se basa en la correspondencia de tres destacadas mujeres de principios del siglo diecinueve en la Sudamérica espa ola (Manuela Sáenz, Mariquita Sánchez de Thompson y Carmen Arriagada) para analizar sus ideas sobre la identidad nacional y el lugar de la mujer en las nuevas repúblicas. Sus cartas revelan que las redes de amistad influenciaron en su diverso grado de nacionalismo y les permitieron defender que las mujeres podían jugar un papel importante en la reconciliación nacional durante el periodo de lucha civil. Propongo que la nueva concepción de las naciones como comunidades imaginadas (Anderson, 1983) se enraíce en las interacciones sociales de estas -más peque as pero más tangibles- comunidades de escritores, conversadores y conspiradores políticos. Excluidas de la función pública, y por tanto inhabilitadas para seguir sus ambiciones personales, estas tres mujeres afirmaron que ponían la unidad nacional por encima de la política partidista. Aunque dicho argumento hacía imposible exigir los derechos de plena ciudadanía para las mujeres, fueron más allá del restrictivo rol de esposa y madre desprendida, que se estaba convirtiendo progresivamente en la idea oficial, para hacer de consejeras y mediadoras en el espacio político.
Coalescence of Low-Viscosity Fluids in Air
Sarah C. Case
Physics , 2008, DOI: 10.1103/PhysRevE.79.026307
Abstract: An electrical method is used to study the early stages of coalescence of two low-viscosity drops. A drop of aqueous NaCl solution is suspended in air above a second drop of the same solution which is grown until the drops touch. At that point a rapidly widening bridge forms between them. By measuring the resistance and capacitance of the system during this coalescence event, one can obtain information about the time dependence of the characteristic bridge radius and its characteristic height. At early times, a new asymptotic regime is observed that is inconsistent with previous theoretical predictions. The measurements at several drop radii and approach velocities are consistent with a model in which the two liquids coalesce with a slightly deformed interface.
The Effects of Perceptual Grouping and Category Boundary Salience on Location Memory  [PDF]
Emily K. Farran, Sarah C. Connell, Bhupinderjit K. Pharwaha
Psychology (PSYCH) , 2012, DOI: 10.4236/psych.2012.311143
Abstract: The type of information used to process spatial layouts was assessed by observing the effect of spatial category salience and perceptual grouping (a non-spatial category), on a location memory task. Participants (N = 64) learnt the pairings between twenty objects and twenty marked locations within a “house”. They then placed the objects in the remembered locations, without the aid of location markers. Spatial category salience was manipulated by presenting the house as an open space (no boundary condition) or by dividing the space into quadrants (boundary condition). Perceptual grouping was manipulated by using identical shapes (control condition) or sets of shapes which identified triads of objects (perceptual grouping condition). Both non-spatial and spatial categories improved location memory accuracy. The non- spatial category produced a prototype effect and the spatial category produced a subdivision effect. Different patterns of category dominance (spatial vs. non-spatial) were observed for level of accuracy compared to distortion effects.
Curating Knowledge and Curating Fun: An Analysis of the Expanding Roles of Children’s Museums  [PDF]
Sarah C. Harris, Flávio S. Azevedo, Anthony J. Petrosino
Creative Education (CE) , 2018, DOI: 10.4236/ce.2018.912138
Abstract: Museums constantly undergo shifts and changes in the roles and functions they serve in society. We report on the expanding roles of a children’s STEAM museum through a case study of two adult-only, fundraising events that the museum implemented. Drawing on both qualitative and quantitative measures, our analysis pursues two complementary threads. First, we seek to characterize those events in detail so that we might understand the events’ culture and functioning. Second, we look into the population who frequents the events, focusing specifically on various indicators of socio-economic status. By bringing these analytical threads together, we corroborate the finding that museums are expanding into?curating fun?experiences that are highly tailored to certain segments of the adult public. Importantly, attending to the empirical details of such processes, we further find that the observed changes1) directly impact the job demands and require?skills of children’s museum staff, 2) reify?the museum as an important economic agent in the community, and 3) potentially reproduce patterns of inequitable access to STEAM cultural capital, among others.
Testing the attentional boundary conditions of subliminal semantic priming: the influence of semantic and phonological task sets
Sarah C. Adams,Markus Kiefer
Frontiers in Human Neuroscience , 2012, DOI: 10.3389/fnhum.2012.00241
Abstract: Recent studies challenged the classical notion of automaticity and indicated that even unconscious automatic semantic processing is under attentional control to some extent. In line with our attentional sensitization model, these data suggest that a sensitization of semantic pathways by a semantic task set is necessary for subliminal semantic priming to occur while non-semantic task sets attenuate priming. In the present study, we tested whether masked semantic priming is also reduced by phonological task sets using the previously developed induction task paradigm. This would substantiate the notion that attention to semantics is necessary for eliciting unconscious semantic priming. Participants first performed semantic and phonological induction tasks that should either activate a semantic or a phonological task set. Subsequent to the induction task, a masked prime word, either associated or non-associated with the following lexical decision target word, was presented. Across two experiments, we varied the nature of the phonological induction task (word phonology vs. letter phonology) to assess whether the attentional focus on the entire word vs. single letters modulates subsequent masked semantic priming. In both experiments, subliminal semantic priming was only found subsequent to the semantic induction task, but was attenuated following either phonological induction task. These results indicate that attention to phonology attenuates subsequent semantic processing of unconsciously presented primes whether or not attention is directed to the entire word or to single letters. The present findings therefore substantiate earlier evidence that an attentional orientation toward semantics is necessary for subliminal semantic priming to be elicited.
Enhancing Domain Wall Speed in Nanowires with Transverse Magnetic Fields
Andrew Kunz,Sarah C. Reiff
Physics , 2007, DOI: 10.1063/1.2829032
Abstract: Dynamic micromagnetic simulation studies have been completed to observe the motion of a domain wall in a magnetic nanowire in an effort to increase the field-driven domain wall speed. Previous studies have shown that the wire dimensions place a cap on the maximum speed attainable by a domain wall when driven by a magnetic field placed along the direction of the nanowire. Here we present data showing a significant increase in the maximum speed of a domain wall due to the addition of a magnetic field placed perpendicular to the longitudinal driving field. The results are expressed in terms of the relative alignment of the transverse field direction with respect to the direction of the magnetic moments within the domain wall. In particular, when the transverse field is parallel to the magnetic moments within the domain wall, the velocity of the wall varies linearly with the strength of the transverse field increasing by up to 20%. Further examination of the domain wall structure shows that the length of the domain wall also depends linearly on the strength of the transverse field. We present a simple model to correlate the effects.
Fast domain wall motion in nanostripes with out-of-plane fields
Andrew Kunz,Sarah C. Reiff
Physics , 2008, DOI: 10.1063/1.2976678
Abstract: Controlling domain wall motion is important due to the impact on the viability of proposed nanowire devices. One hurdle is slow domain wall speed when driven by fields greater than the Walker field, due to nucleation of vortices in the wall. We present simulation results detailing the dynamics of these vortices; including the nucleation and subsequent fast ejection of the vortex core leading to fast domain wall speeds. The ejection is due to the reversal of the core moments by an out-of-plane field. The technique can be used to produce domain walls of known orientation independent of the initial state.
The AGN Black Hole Mass Database
Misty C. Bentz,Sarah Katz
Physics , 2014, DOI: 10.1086/679601
Abstract: The AGN Black Hole Mass Database is a compilation of all published spectroscopic reverberation-mapping studies of active galaxies. We have created a public web interface, where users may get the most up-to-date black hole masses from reverberation mapping for any particular active galactic nucleus (AGN), as well as obtain the individual measurements upon which the masses are based and the appropriate references. While the database currently focuses on the measurements necessary for black hole mass determinations, we also plan to expand it in the future to include additional useful information, such as host-galaxy characteristics. New reverberation mapping results will also be incorporated into the database as they are published in peer-refereed journals.
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