Racial Disparities in Education Finance: Going Beyond Equal Revenues

Examines the impact of court rulings mandating equal spending per student across districts with minority and white students, points out the lack of data measuring academic outcomes, and proposes policies to ensure an adequate education for all students

I’M ACTUALLY AN ARTIST TOO… Artists who are arts managers

This research investigates how artists might resolve their dual professional identities and continue to be artists when also working in arts management in order to earn a more secure living than is usually possible from art alone. In doing so, it asks how arts organisations could benefit more greatly from the creative practice of the artists they employ as arts managers. The study questions the assumption that artists who work as arts managers must have ‘failed’ in their artistic ambitions and argues that a more nuanced approach is necessary. Rather than artists abandoning their creative practice, and necessitating their identity as an artist being kept ‘invisible’ in the workplace, this thesis argues for both their art and artistic identity to be a visible part of their practice as managers. If this were to happen, it is argued artists and arts management would both stand to gain. The study adopted a qualitative methodology and involved a multi-method, three-phase approach. The first phase recorded data about the lived experiences of 30 participants working primarily as arts managers across a range of creative sectors. The second phase took the form of an intervention into their professional practice and asked a smaller group to make at least one artwork in the context of their work as arts managers. This included several individuals who work in a single arts organisation. The third phase investigated the data generated from an online group discussion attended by a smaller group of participants. As a former artist, arts manager and maker of contemporary jewellery, I took part in all three phases as a participant-researcher. The thesis concludes by arguing that arts organisations, and the artist-managers who work in them, need to bring about change through incremental steps, and by consensus. This change is not only to enable artist-managers to retain their creative practices and identity, but in order for the arts organisations where they work to benefit from the particular skills and knowledge artist-managers can bring. It is argued that this is best achieved through dialogue, rather than by keeping the two different, but interdependent practices separate. In this way, through the recognition and visibility of creative practice in the arts workplace, both would be strengthened

Environmental Migrants and Canada’s Refugee Policy

Canada is among the world’s foremost refugee resettlement countries and is signatory to international agreements that affirm its commitment to the protection of refugee rights. Asylum seekers come to Canada from around the globe. But as climate change continues to affect growing regions of the world—threatening to create as many as 200 million environmental migrants by the year 2050—Canada has not yet begun to address the issue of climate change migration. In an era defined by a neo-liberal approach to migration issues, and until international actors determine the status of environmental migrants, Canada’s policy response to the looming crisis may be conjectured from an historical review of its refugee policy. This provides an understanding of the various factors, both domestic and international, that may have the greatest influence on Canada’s future refugee policy.Le Canada est aux premières loges dans le domaine de la réinstallation des réfugiés et est signataire de conventions internationales qui confirment son engagement envers la protection des droits des réfugiés. Des demandeurs d’asile viennent au Canada de partout dans le monde. Mais alors que le changement climatique continue d’affecter les régions viticoles du monde, menaçant de créer non moins de 200 millions de migrants climatiques d’ici l’an 2050, le Canada n’a pas encore commencé à aborder la question des migrations dues aux changements climatiques. Dans une époque caractérisée par une approche néolibérale envers la question de la migration, et jusqu’ à ce que le statut des migrants climatiques soit déterminé par les acteurs internationaux, on peut deviner la réponse politique canadienne à la crise imminente à partir d’un examen historique de sa politique envers les réfugiés. Cette approche éclaire les différents facteurs, tant internes qu’internationaux, qui peuvent avoir le plus d’influence sur l’avenir de la politique canadienne envers les réfugiés

Environmental Migrants and Canada’s Refugee Policy

Canada is among the world’s foremost refugee resettlement countries and is signatory to international agreements that affirm its commitment to the protection of refugee rights. Asylum seekers come to Canada from around the globe. But as climate change continues to affect growing regions of the world—threatening to create as many as 200 million environmental migrants by the year 2050—Canada has not yet begun to address the issue of climate change migration. In an era defined by a neo-liberal approach to migration issues, and until international actors determine the status of environmental migrants, Canada’s policy response to the looming crisis may be conjectured from an historical review of its refugee policy. This provides an understanding of the various factors, both domestic and international, that may have the greatest influence on Canada’s future refugee policy.Le Canada est aux premières loges dans le domaine de la réinstallation des réfugiés et est signataire de conventions internationales qui confirment son engagement envers la protection des droits des réfugiés. Des demandeurs d’asile viennent au Canada de partout dans le monde. Mais alors que le changement climatique continue d’affecter les régions viticoles du monde, menaçant de créer non moins de 200 millions de migrants climatiques d’ici l’an 2050, le Canada n’a pas encore commencé à aborder la question des migrations dues aux changements climatiques. Dans une époque caractérisée par une approche néolibérale envers la question de la migration, et jusqu’ à ce que le statut des migrants climatiques soit déterminé par les acteurs internationaux, on peut deviner la réponse politique canadienne à la crise imminente à partir d’un examen historique de sa politique envers les réfugiés. Cette approche éclaire les différents facteurs, tant internes qu’internationaux, qui peuvent avoir le plus d’influence sur l’avenir de la politique canadienne envers les réfugiés

Site- and Species-Specific Patterns of Metal Bioavailability in Edible Plants

Differences in metal uptake between plant species and soil types were compared to assess the safe use of mildly contaminated soils for the growth of edible food crops. Accumulation of metals in five plant species grown in each of three field soils and a commercial soil were evaluated in a controlled environment room. Metal bioavailability varied more with plant species than with type of soil. Among a number of physical and chemical soil properties that were determined, high metal content and low percent organic matter were the best predictors of increased metal bioavailability. Contamination levels of metals measured in soil and vegetable samples were used to calculate bioconcentration factors and hazard quotients. The results indicated significant differences between plant species. The most metal-accumulating species was carrot and the most mobile element was cadmium. Some hazard quotients exceeded the threshold value of 1, even in soils considered uncontaminated by current guidelines. Overall, these results reinforce the need to include soil characteristics when setting threshold guidelines for metal content of agricultural soils and indicate the need for species-specific planting guidelines

Compost Application Affects Metal Uptake in Plants Grown in Urban Garden Soils and Potential Human Health Risk

Purpose This study explores the effect of varying organic matter content on the potential human health risk of consuming vegetables grown in urban garden soils. Materials and methods Metal accumulation among edible tissues of green bean (Phaseolus vulgaris L.), lettuce (Lactuca sativa L.) and carrot (Daucus carota L.) was determined for plants grown in five urban garden soils amended with 0, 9, or 25% (v/v) compost. Potential risk to human health was assessed by calculating a bioconcentration factor and a hazard quotient. Results and discussion Overall, the consumption of lettuce and green bean pods grown in some urban gardens posed a potential human health risk due to unacceptably high concentrations of cadmium or lead. In many cases, compost amendment increased the accumulation of metals in the vegetables. Even in soils considered uncontaminated by current guidelines, some hazard quotients exceeded the threshold value of 1. The compost used in this study had a high fulvic acid to humic acid ratio, which may explain increased concentrations of metals in plants grown in compost-amended soils. Conclusions These results indicate a need to include soil characteristics, specifically organic matter quality, when setting threshold criteria for metal content of urban garden soils

Comparison of single-layer and double-layer anti-reflection coatings using laser-induced damage threshold and photothermal common-path interferometry

The dielectric thin-film coating on high-power optical components is often the weakest region and will fail at elevated optical fluences. A comparison of single-layer coatings of ZrO2, LiF, Ta2O5, SiN, and SiO2 along with anti-reflection (AR) coatings optimized at 1064 nm comprised of ZrO2 and Ta2O5 was made, and the results of photothermal common-path interferometry (PCI) and a laser-induced damage threshold (LIDT) are presented here. The coatings were grown by radio frequency (RF) sputtering, pulsed direct-current (DC) sputtering, ion-assisted electron beam evaporation (IAD), and thermal evaporation. Test regimes for LIDT used pulse durations of 9.6 ns at 100 Hz for 1000-on-1 and 1-on-1 regimes at 1064 nm for single-layer and AR coatings, and 20 ns at 20 Hz for a 200-on-1 regime to compare the //ZrO2/SiO2 AR coating

Investigating the relationship between material properties and laser-induced damage threshold of dielectric optical coatings at 1064 nm

The Laser Induced Damage Threshold (LIDT) and material properties of various multi-layer amorphous dielectric optical coatings, including Nb2O5, Ta2O5, SiO2, TiO2, ZrO2, AlN, SiN, LiF and ZnSe, have been studied. The coatings were produced by ion assisted electron beam and thermal evaporation; and RF and DC magnetron sputtering at Helia Photonics Ltd, Livingston, UK. The coatings were characterized by optical absorption measurements at 1064 nm by Photothermal Common-path Interferometry (PCI). Surface roughness and damage pits were analyzed using atomic force microscopy. LIDT measurements were carried out at 1064 nm, with a pulse duration of 9.6 ns and repetition rate of 100 Hz, in both 1000-on-1 and 1-on-1 regimes. The relationship between optical absorption, LIDT and post-deposition heattreatment is discussed, along with analysis of the surface morphology of the LIDT damage sites showing both coating and substrate failure

Mechanical loss of a multilayer tantala/silica coating on a sapphire disk at cryogenic temperatures: toward the KAGRA gravitational wave detector

We report the results of a new experimental setup to measure the mechanical loss of coating layers on a thin sapphire disk at cryogenic temperatures. Some of the authors previously reported that there was no temperature dependence of the mechanical loss from a multilayer tantala/silica coating on a sapphire disk, both before and after heat treatment, although some reports indicate that Ta<sub>2</sub>O<sub>5</sub> and SiO<sub>2</sub> layers annealed at 600 °C have loss peaks near 20 K. Since KAGRA—the Japanese gravitational-wave detector, currently under construction—will be operated at 20 K and have coated sapphire mirrors, it is very important to clarify the mechanical loss behavior of tantala/silica coatings around this temperature. We carefully investigate a tantala/silica-coated sapphire disk with the new setup, anneal the disk, and then investigate the annealed disk. We find that there is no distinct loss peak both before and after annealing under particular conditions. The mechanical loss for the unannealed disk at 20 K is about 5×10<sup>−4</sup>, as previously reported, while that for the annealed disk is approximately 6.4×10<sup>−4</sup>

Cryogenic mechanical loss of a single-crystalline GaP coating layer for precision measurement applications

The first direct observations of gravitational waves have been made by the Advanced LIGO detectors. However, the quest to improve the sensitivities of these detectors remains, and epitaxially grown single-crystal coatings show considerable promise as alternatives to the ion-beam sputtered amorphous mirror coatings typically used in these detectors and other such precision optical measurements. The mechanical loss of a 1 μm thick single-crystalline gallium phosphide (GaP) coating, incorporating a buffer layer region necessary for the growth of high quality epitaxial coatings, has been investigated over a broad range of frequencies and with fine temperature resolution. It is shown that at 20 K the mechanical loss of GaP is a factor of 40 less than an undoped tantala film heat-treated to 600 °C and is comparable to the loss of a multilayer GaP/AlGaP coating. This is shown to translate into possible reductions in coating thermal noise of a factor of 2 at 120 K and 5 at 20 K over the current best IBS coatings (alternating stacks of silica and titania-doped tantala). There is also evidence of a thermally activated dissipation process between 50 and 70 K