VLA Observations of a Complete Sample of Radio Loud Quasars between redshifts 2.5 and 5.28: I. high-redshift sample summary and the radio images

We present high resolution (arcsecond or better) observations made with the Karl G. Jansky Very Large Array of 123 radio-loud quasars with redshifts in the range $2.5 \leq z \leq 5.28$ that form a complete flux limited sample ($\geq 70$ mJy at 1.4 GHz or 5 GHz). Where possible, we used previous high resolution VLA observations (mainly A array at 1.4, 5 and 8 GHz) from the NRAO archive and re-imaged them (43 sources). For the remainder, new observations were made in the A array at 1.4 and 5 GHz. We show images of the 61 resolved sources, and list structural properties of all of them. Optical data from the SDSS are available for nearly every source. This work represents a significant increase in the number of high redshift quasars with published radio structures, and will be used to study the properties and evolution of luminous radio sources in the high redshift universe

L’étudiant autochtone et les études supérieures : regards croisés au sein des institutions

Comprend des références bibliographiquesRapport de recherche ayant servi à l’élaboration du Guide d’intervention institutionnelle favorisant la persévérance et la réussite scolaire des étudiants autochtones au Cégep et à l’Université. Réalisé dans le cadre du programme Chantiers 3 mis en place par le Ministère de l’Éducation, du Loisir et du Sport.Diffusé avec l'aimable autorisation des auteurs. Le document original est également accessible en ligne : https://reussiteautochtone.wordpress.com/Voir aussi le "Guide d’intervention institutionnelle favorisant la persévérance et la réussite scolaire des étudiants autochtones du cégep de Baie-Comeau" et le "Guide d’accueil des étudiantes et des étudiants autochtones", également disponibles dans EDUQ.inf

Discovery of a Kiloparsec Scale X-ray/Radio Jet in the z=4.72 Quasar GB 1428+4217

We report the discovery of a one-sided 3.6" (24 kpc, projected) long jet in the high-redshift, z=4.72, quasar GB 1428+4217 in new Chandra X-ray and VLA radio observations. This is the highest redshift kiloparsec-scale X-ray/radio jet known. Analysis of archival VLBI 2.3 and 8.6 GHz data reveal a faint one-sided jet extending out to ~200 parsecs and aligned to within ~30 deg of the Chandra/VLA emission. The 3.6" distant knot is not detected in an archival HST image, and its broad-band spectral energy distribution is consistent with an origin from inverse Compton scattering of cosmic microwave background photons for the X-rays. Assuming also equipartition between the radiating particles and magnetic field, the implied jet Lorentz factor is ~5. This is similar to the other two known z ~ 4 kpc-scale X-ray jet cases and smaller than typically inferred in lower-redshift cases. Although there are still but a few such very high-redshift quasar X-ray jets known, for an inverse Compton origin, the present data suggest that they are less relativistic on large-scales than their lower-redshift counterparts.Comment: ApJL, accepted, 5 pages, 3 figure

The Highest Redshift Relativistic Jets

We describe our efforts to understand large-scale (10's-100's kpc) relativistic jet systems through observations of the highest-redshift quasars. Results from a VLA survey search for radio jets in ~30 z>3.4 quasars are described along with new Chandra observations of 4 selected targets.Comment: 5 pages, 2 figures, to appear in Extragalactic Jets: Theory and Observation from Radio to Gamma Ray, Eds. T.A. Rector and D.S. De Youn

Les assises idéologiques du projet conservateur de Stephen Harper

Plusieurs indices permettent de croire que le premier ministre Harper a pour projet de faire du Parti conservateur le parti politique dominant au Canada. À cette fin, il doit transformer l’organisation sociale et politique du pays de façon à le rendre plus conservateur. L’objectif du présent mémoire est de préciser les fondements idéologiques du projet de réforme de l’État canadien du premier ministre en m’appuyant sur les écrits des membres de l’École de Calgary. Je fais l’hypothèse que les politiques publiques mises en place par Harper sont inspirées des convictions des membres de cette école de pensée, dont il est un proche. Dans le premier chapitre, je détermine la signification du concept d’idéologie et établis la pertinence de l’analyse des idéologies pour expliquer les décisions politiques. Je définis ensuite les principaux types de conservatisme, afin de déterminer lequel inspire les membres de l’École de Calgary et le Parti conservateur. Dans le second chapitre, je dresse un portrait de la pensée de l’École de Calgary relativement à quatre thèmes, soit ceux du développement économique et social, du pouvoir judiciaire, de la politique étrangère et de l’identité nationale. Enfin, dans le troisième chapitre, je recense les décisions prises par le gouvernement Harper en relation avec ces quatre mêmes thèmes et vérifie leur concordance avec les idées portées par l’École de Calgary.Several signs suggest that Prime minister Stephen Harper is seeking to make the Conservative Party the new dominant political party in Canada. For this purpose, he has to transform the social and political organization of the country to make it more conservative and move the ideological preferences of the majority to the right. The objective of this thesis is to explain the ideological foundations of the reform strategy adopted by Harper in light of the writings of the members of the Calgary School. Because the Prime minister is close to the members of this school of thought, my hypothesis is that the public policies he implements are inspired by their convictions. Through a brief review of the literature, I clarify, in the first chapter, the meaning of the concept of ideology and establish the relevance of studying ideologies to explain political decisions. Then, I define the main types of conservatism to determine which one inspires the Calgary School and the Conservative Party. In the second chapter, I draw a portrait of the ideas promoted by the members of the Calgary School, on issues of social and economic development, on the role of the judiciary, on foreign relations and on national identity. Finally, in the third chapter, I identify the decisions taken by the Harper government in relation to these four themes since it came to power and I verify their consistency with the ideas promoted by the Calgary School

Harnessing the power of loneliness: a social functional approach to loneliness at work

Much of the current theoretical and empirical research exploring the behavioral outcomes of loneliness is based on chronic loneliness. However, nearly everyone has experienced transient feelings of loneliness throughout their life. In this dissertation I examine the social function of state loneliness and suggest that interpersonal helping is a positive outcome that results from this emotion. By drawing on theories of belonging (Baumeister & Leary, 1995; Pickett & Gardner, 2005) attributions (Weiner, 1974; Weiner, 1979), and motivation (Vroom, 1964), I propose an interactive model in which the need to belong and the attributions people make about their loneliness combine to both amplify and attenuate the impact of loneliness on interpersonal helping behavior. This model is tested in three studies with both measured and manipulated state loneliness. Implications for employees and organizations are discussed.Doctor of Philosoph

Life space limitations in visually impaired older adults

SignificanceFuture work should develop and evaluate interventional strategies to help overcome visual and health-related barriers to travel in visually impaired seniors and mitigate adverse impacts of loneliness for those who do not leave town.PurposeLife space refers to the area in which a person travels within a given time period. We explored whether demographics, vision, and/or health characteristics were related to restrictions in self-reported life space for visually impaired seniors.MethodsVisually impaired (n = 114) clinical trial participants aged ≥55 years learned visual assistive iPhone apps and completed the following baseline questionnaires: Life Space, 36-Item Short-Form Health Survey, University of California, Los Angeles Loneliness Scale, and New-General Self-efficacy Scale. Multiple logistic regressions evaluated associations between life space and patient factors after accounting for their distance to the next county or state.ResultsDuring 2021 to 2023, 17%, 43%, and 70% of participants had not left their town, county, or state, respectively, in the past 3 months, or planned to in the next 3 months. Those with reduced distance best-corrected visual acuity had greater odds of not leaving the county in these time frames (odds ratio [OR] = 3.5; p=0.04). Minority race was associated with greater odds of not leaving town or the county in the past 2 weeks or future 3 months (OR = 4.3 to 6.4; p=0.009 to 0.049). Increased self-efficacy was associated with reduced odds of not leaving the state in the past 3 months, next 3 months, or past and/or future 3 months (OR = 0.54 to 0.55; p=0.02 to 0.03). Better physical function was associated with reduced odds of not leaving the state in the past 2 weeks or 3 months (OR = 0.96 to 0.98; p=0.01 to 0.04). Increased loneliness was related to greater odds of not leaving town in the past and/or future 3 months (OR = 1.8 to 2.0; p=0.007 to 0.009).ConclusionsMinority race, reduced vision, self-efficacy, and physical health were related to life space restrictions in this cohort of visually impaired seniors, whereas loneliness was greater among those who were not leaving town

Two Candidate High-Redshift X-ray Jets Without Coincident Radio Jets

We report the detection of extended X-ray emission from two high-redshift radio quasars. These quasars, J1405+0415 at $z$=3.208 and J1610+1811 at $z$=3.118, were observed in a Chandra snapshot survey selected from a complete sample of the radio-brightest quasars in the overlap area of the VLA-FIRST radio survey and the Sloan Digital Sky Survey. The extended X-ray emission is located along the line connecting the core to a radio knot or hotspot, favoring the interpretation of X-ray jets. The inferred rest frame jet X-ray luminosities from 2--30 keV would be of order 10$^{45}$ erg~s$^{-1}$ if emitted isotropically and without relativistic beaming. In the scenario of inverse Compton scattering of the cosmic microwave background (CMB), X-ray jets without a coincident radio counterpart may be common, and should be readily detectable to redshifts even beyond 3.2 due to the (1+$z$)$^4$ increase of the CMB energy density compensating for the (1+$z$)$^{-4}$ cosmological diminution of surface brightness. If these can be X-ray confirmed, they would be the second and third examples of quasar X-ray jets without detection of underlying continuous radio jets.Comment: 10 pages, 4 figures. Accepted for publication in The Astrophysical Journa

Panama Bridge Project

The Panama Bridge project has partnered with Rio Missions Panama to design a bridge for the village of La Gigi, Panama. The mountain community of La Gigi experiences heavy rainfall during the rainy seasons. A stream runs along the community, separating locals from their fields and other communities further up the mountain. While passable during dry seasons, the stream floods and becomes impassable after heavy rains. The residents are effectively cut off from their livelihoods, church, health services, and other communities during this time. To accommodate this need, the Panama Bridge Team has spent the 2019-2020 school year designing an aluminum truss bridge, spanning 90 feet. The design includes a unique construction strategy to deal with challenging site constraints.https://mosaic.messiah.edu/engr2020/1020/thumbnail.jp