Search results for "object"
showing 10 items of 1888 documents
VCNS II. The IR-excess-selected population
2015
We performed a deep wide-field (6.76 square-degrees) near-infrared survey with the VISTA telescope that covers the entire extent of the Carina nebula complex. Complementing the VISTA near-infrared catalog with Spitzer IRAC mid-infrared photometry improves the situation of the background contamination considerably. We find that a (J-H) versus (Ks-[4.5]) color-color diagram is well suited to tracing the population of YSO-candidates (cYSOs) by their infrared excess. We identify 8781 sources with strong infrared excess, which we consider as cYSOs. This sample is used to investigate the spatial distribution of the cYSOs with a nearest-neighbor analysis. The surface density distribution of cYSOs …
MOJAVE. XIII. New 15GHz observations on 1994-2013
2017
We present 1625 new 15GHz (2cm) VLBA images of 295 jets associated with active galactic nuclei (AGNs) from the MOJAVE and 2cm VLBA surveys, spanning observations between 1994 August 31 and 2013 August 20. For 274 AGNs with at least 5 VLBA epochs, we have analyzed the kinematics of 961 individual bright features in their parsec-scale jets. A total of 122 of these jets have not been previously analyzed by the MOJAVE program. In the case of 451 jet features that had at least 10 epochs, we also examined their kinematics for possible accelerations. At least half of the well-sampled features have non-radial and/or accelerating trajectories, indicating that non-ballistic motion is common in AGN je…
El coaching i l'entrevista motivacional: punts de connexió
2016
El coaching i l’entrevista motivacional són dues tècniques d’intervenció que comparteixen la rellevància concedida al canvi i, actualment, el seu apogeu social. Aquest treball exploratori pretén revisar altres possibles punts de connexió entre ambdues modalitats d’actuació. Per a això, s’empra una anàlisi de treballs recents sobre coaching i documents científics sobre l’entrevista motivacional, localitzats a través de la base de dades bibliogràfica Dialnet. La mostra documental també s’ha enriquit amb aportacions d’experts que apliquen o investiguen sobre les dues tècniques. Els resultats del treball ofereixen dades específiques sobre: l’origen del coaching i de l’entrevista motivacional, l…
The WEBT BL Lacertae Campaign 2001 and its extension : Optical light curves and colour analysis 1994–2002
2004
BL Lacertae has been the target of four observing campaigns by the Whole Earth Blazar Telescope (WEBT) collaboration. In this paper we present UBVRI light curves obtained by theWEBT from 1994 to 2002, including the last, extended BL Lac 2001 campaign. A total of about 7500 optical observations performed by 31 telescopes from Japan to Mexico have been collected, to be added to the ∼15 600 observations of the BL Lac Campaign 2000. All these data allow one to follow the source optical emission behaviour with unprecedented detail. The analysis of the colour indices reveals that the flux variability can be interpreted in terms of two components: longer-term variations occurring on a fewday time …
Laboratory formation of a scaled protostellar jet by coaligned poloidal magnetic field
2014
International audience; Although bipolar jets are seen emerging from a wide variety of astrophysical systems, the issue of their formation and morphology beyond their launching is still under study. Our scaled laboratory experiments, representative of young stellar object outflows, reveal that stable and narrow collimation of the entire flow can result from the presence of a poloidal magnetic field whose strength is consistent with observations. The laboratory plasma becomes focused with an interior cavity. This gives rise to a standing conical shock from which the jet emerges. Following simulations of the process at the full astrophysical scale, we conclude that it can also explain recentl…
Optimal design of k-out-of-n systems
2016
The present paper is aimed at finding the best compromise to design a system k-out-of-n reliability configuration by means of the formulation of a multi-objective mathematical model. The Pareto front, which is the set of non-dominated solutions, is determined by considering the stationary availability and the achievable profit as objectives to be simultaneously optimized. The Pareto front represents a useful tool for the analyst to make the choice related to the analyzed design problem. In addition, the knowledge of the Pareto front permits to consider different design scenarios.
Empathy in Technology Design and Graffiti
2021
This paper discusses empathic understanding, what it means, and how it can be acquired. After an overview of some theories and models from the existing literature, two experiments are presented, where participants were assessing graffiti works. From the results of these experiments, it can be concluded that empathic understanding involves both embodied processes and abstract inferences. Furthermore, understanding can be based on perceived, mechanistic bodily similarities and movements or on folk-psychological inferences mentalized between the observer/empathizer and an object/empathized. Empathic understanding it can also be gained by recognizing and implementing learned bodily skills and c…
Diversity – a Challenge for Educators
2006
The challenge for most European countries is to educate second generation immigrants in particular in order to fulfill their parents’ dreams, but above all, to create a situation where students have hope of finding meaningful life in serving their new country in different workplaces. Effective education is a vital source of personal opportunity as well as means to support the economic development of young people in any society. Diversity must be viewed as a valuable learning source for all students in any classroom. In working and doing things together, students can develop a sense of respect for, and tolerance towards, different cultural and ethnic groups in our societies. Only through int…
Why open educational resources repositories fail : the contribution of quality approaches to the success of repositories
2016
Over the last two decades, millions of Open Educational Resources (OER) have become freely available for teachers and learners online. These resources are usually accessible through Learning Object Repositories (LORs), which are databases with a user interface. LORs are rarely used to their full potential and often considered as ‘failures’. Previous studies have shown that quality has a critical role in the success of information systems such as LORs. However there are no common guidelines for quality assurance approaches for LORs, nor are there studies into the contribution made by different LOR quality assurance approaches to the success of a repository. Measuring quality and success have…
Hybridizing large neighborhood search and exact methods for generalized vehicle routing problems with time windows
2021
International audience; Delivery options are at the heart of the generalized vehicle routing problem with time windows (GVRPTW) allowing that customer requests are shipped to alternative delivery locations which can also have different time windows. Recently, the vehicle routing problem with delivery options was introduced into the scientific literature. It extends the GVRPTW by capacities of shared locations and by specifying service-level constraints defined by the customers' preferences for delivery options. The vehicle routing problem with delivery options also generalizes the vehicle routing problem with home roaming delivery locations and the vehicle routing problem with multiple time…