329,730 research outputs found

    MUSLIM COLLEGE STUDENTS AND CIVIC ENGAGEMENT

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    This study explores the nature of civic engagement of Muslim college students in the United States. The Community of Practice Theory is used as a conceptual structure to explore the relation between meaning, practice, identity and organization for Muslim students active in civic engagement through campus-based Muslim Student organizations. Pluralism, as shared values that combine different people and advocates wider civic participation, was adopted as part of the conceptual framework to see how the Muslim students think, serve, learn, and develop throughout the process of engagement on campus and in the local community. Particular attention is paid to the impacts of Islamophobia on the one hand and campus initiatives for diversity and inclusion on the other. The study uses a mixed method design to uncover multiple dimensions of civic engagement of the Muslim students. In the first part of the study, a close-ended survey completed by fifty Muslim students on three Midwestern college campuses with active Muslim Student Associations (MSA) explored the domains, types, and intensity of civic engagement. In the subsequent qualitative field research, interviews of 12 members of the three MSAs explored the purposes, goals, effects, values, and aims of civic engagement from personal and organizational perspectives. The qualitative design also included field observations of MSA meetings and activities. The study found that Muslim students’ engagement in civic practices is driven by religious, national, and conditional factors. Islam is the moral compass that incentivizes and guides their social and service activities on campus and in the local community. Through different aspects of practice, Muslim students affirm their presence as American citizens and encounter the negative discourses and images circulated about their faith identity. Engagement in the organization opens up ways for the Muslim students to establish constructive relations with non-Muslims, create connection and collaboration between the campus and the local community of Muslims, grow civically, and develop various leadership skills

    Metabolic Enzyme Activities of Benthic Zoarcids off the Coast of California

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    OCN 499 - Undergraduate Thesi

    AUS-ACCESS4EU: Supporting EU Access to Australian Research Programmes

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    ACCESS4EU projects aim to increase the European research community’s awareness of opportunities to participate in research, technological development and innovation (RTDI) programmes in industrialised partner countries outside the EU

    AUS-ACCESS4EU Newsletter

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    The AUS-ACCESS4EU newsletter details a number of ACCESS4EU projects in a two year programme to raise awareness of the current research and development landscape in Australia

    High-energy sources at low radio frequency : the Murchison Widefield Array view of Fermi blazars

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    This is the accepted version of the following article: Giroletti, M. et al., A&A, 588 (2016) A141, which has been published in final form at DOI: http://dx.doi.org/10.1051/0004-6361/201527817. This article may be used for non-commercial purposes in accordance with the EDP Sciences self-archiving policies.Low-frequency radio arrays are opening a new window for the study of the sky, both to study new phenomena and to better characterize known source classes. Being flat-spectrum sources, blazars are so far poorly studied at low radio frequencies. We characterize the spectral properties of the blazar population at low radio frequency compare the radio and high-energy properties of the gamma-ray blazar population, and search for radio counterparts of unidentified gamma-ray sources. We cross-correlated the 6,100 deg^2 Murchison Widefield Array Commissioning Survey catalogue with the Roma blazar catalogue, the third catalogue of active galactic nuclei detected by Fermi-LAT, and the unidentified members of the entire third catalogue of gamma-ray sources detected by \fermilat. When available, we also added high-frequency radio data from the Australia Telescope 20 GHz catalogue. We find low-frequency counterparts for 186 out of 517 (36%) blazars, 79 out of 174 (45%) gamma-ray blazars, and 8 out of 73 (11%) gamma-ray blazar candidates. The mean low-frequency (120--180 MHz) blazar spectral index is αlow=0.57±0.02\langle \alpha_\mathrm{low} \rangle=0.57\pm0.02: blazar spectra are flatter than the rest of the population of low-frequency sources, but are steeper than at \simGHz frequencies. Low-frequency radio flux density and gamma-ray energy flux display a mildly significant and broadly scattered correlation. Ten unidentified gamma-ray sources have a (probably fortuitous) positional match with low radio frequency sources. Low-frequency radio astronomy provides important information about sources with a flat radio spectrum and high energy. However, the relatively low sensitivity of the present surveys still misses a significant fraction of these objects. Upcoming deeper surveys, such as the GaLactic and Extragalactic All-Sky MWA (GLEAM) survey, will provide further insight into this population.Peer reviewedFinal Published versio

    An Ultra diffuse Galaxy in the NGC 5846 group from the VEGAS survey

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    Many ultra diffuse galaxies (UDGs) have now been identified in clusters of galaxies. However, the number of nearby UDGs suitable for detailed follow-up remain rare. Our aim is to begin to identify UDGs in the environments of nearby bright early-type galaxies from the VEGAS survey. Here we use a deep g band image of the NGC 5846 group, taken as part of the VEGAS survey, to search for UDGs. We found one object with properties of a UDG if it associated with the NGC 5846 group, which seems likely. The galaxy, we name NGC 5846_\_UDG1, has an absolute magnitude of Mg_g = -14.2, corresponding to a stellar mass of \sim108^8 M_{\odot}. It also reveals a system of compact sources which are likely globular clusters. Based on the number of globular clusters detected we estimate a halo mass that is greater than 8×\times1010^{10} M_{\odot} for UDG1.Comment: 5 pages, 4 figures, accepted for publication in A&

    An Enhanced Ipv6 Anycast Routing Protocol Using Protocol Independent Multicast-Sparse Mode With Mobile Ipv6

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    Anycast routing is an efficient routing mechanism that enables the network to choose the nearest and most appropriate server very quickly. However, IPv6 Anycast is not used widely in practice yet, and there are many reasons for this. Firstly, IPv6 Anycast does not have its own standard protocol because anycast builds its anycast membership tree like multicast does but unlike multicast it sends only to one of the groups using unicast mechanism. The other problem is that IPv6 Anycast mechanism could not provide stateful connections between the sender and the receiver because the sender always change the receiver based on the metric or the distance. In this thesis a new IPv6 anycast routing protocol is developed to provide a stateful communication between the anycast sender and the receiver. Protocol Independent Multicast-Sparse Mode (PIM-SM) has been chosen to establish the new IPv6 anycast mechanism because of many similar properties between multicast and anycast. A new variable is proposed in the routing table called Best Metric Factor (BMF) to describe the status of the receiver (free or Busy). This factor is used to decide the appropriate receiver to choose, the advantage of the proposed design can be observed easily when there are multi-anycast senders sending their traffic to the appropriate receiver at the same time. Next we improve the mechanism by building a direct connection between the anycast sender and the anycast receiver using route optimization by mapping the objects in Mobile IPv6 to the objects in the proposed mechanism. This is because there are many similar properties between Mobile IPv6 and the proposed design. The proposed mechanism has been shown to achieve a good performance with multi-anycast senders and can provide a stateful communication between the sender and the appropriate receiver

    Homogeneous metallicities and radial velocities for Galactic globular clusters. II. New CaT metallicities for 28 distant and reddened globular clusters

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    Although the globular clusters in the Milky Way have been studied for a long time, a significant fraction of them lack homogeneous metallicity and radial velocity measurements. In an earlier paper we presented the first part of a project to obtain metallicities and radial velocities of Galactic globular clusters from multiobject spectroscopy of their member stars using the ESO Very Large Telescope. In this paper we add metallicities and radial velocities for a new sample of 28 globular clusters, including in particular globular clusters in the MW halo and the Galactic bulge. Together with our previous results, this study brings the number of globular clusters with homogeneous measurements to 69\sim 69 \% of those listed in the W. Harris' catalogue. As in our previous work, we have used the CaII triplet lines to derive metallicities and radial velocities. For most of the clusters in this study, this is the first analysis based on spectroscopy of individual member stars. The metallicities derived from the CaII triplet are then compared to the results of our parallel study based on spectral fitting in the optical region and the implications for different calibrations of the CaII triplet line strengths are discussed. We also comment on some interesting clusters and investigate the presence of an abundance spread in the globular clusters here. A hint of a possible intrinsic spread is found for NGC 6256, which therefore appears to be a good candidate for further study.Comment: 13 pages, 9 figures, accepted for publication in Astronomy and Astrophysic

    VEGAS: a VST Early-type GAlaxy Survey. IV. NGC 1533, IC 2038 and IC 2039: an interacting triplet in the Dorado group

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    This paper focuses on NGC 1533 and the pair IC 2038 and IC 2039 in Dorado a nearby, clumpy, still un-virialized group. We obtained their surface photometry from deep OmegaCAM@ESO-VST images in g and r bands. For NGC 1533, we map the surface brightness down to μg30.11\mu_g \simeq 30.11 mag/arcsec2^{2} and μr28.87\mu_r \simeq 28.87 mag/arcsec2^{2} and out to about 4Re4R_e. At such faint levels the structure of NGC 1533 appear amazingly disturbed with clear structural asymmetry between inner and outer isophotes in the North-East direction. We detect new spiral arm-like tails in the outskirts, which might likely be the signature of a past interaction/merging event. Similarly, IC 2038 and IC 2039 show tails and distortions indicative of their ongoing interaction. Taking advantages of deep images, we are able to detect the optical counterpart to the HI gas. The analysis of the new deep data suggests that NGC 1533 had a complex history made of several interactions with low-mass satellites that generated the star-forming spiral-like structure in the inner regions and are shaping the stellar envelope. In addition, the VST observations show that also the two less luminous galaxies, IC 2038 and IC 2039, are probably interacting each-other and, in the past, IC 2038 could have also interacted with NGC 1533, which stripped away gas and stars from its outskirts. The new picture emerging from this study is of an interacting triplet, where the brightest galaxy NGC 1533 has ongoing mass assembly in the outskirts.Comment: Accepted for publication in The Astronomical Journal. High-resolution version of paper is available at the following link: https://www.dropbox.com/preview/VEGAS_IV.pdf?role=persona
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