The Distance and Morphology of V723 Cassiopeiae (NOVA CASSIOPEIA 1995)

We present spatially resolved infrared spectra of V723 Cas (Nova Cassiopeia 1995) obtained over four years with the integral field spectrograph OSIRIS on Keck II. Also presented are one epoch of spatially unresolved spectra from the long slit spectrograph NIRSPEC on Keck II. The OSIRIS observations made use of the laser guide star adaptive optics facility that produced diffraction-limited spatial resolution of the strong coronal emission features in the nova ejecta. We remove the point-like continuum from V723 Cas data cubes to reveal details of the extended nebula and find that emission due to [Si VI] and [Ca VIII] has an equatorial ring structure with polar nodules-a strikingly different morphology than emission due to [Al IX], which appears as a prolate spheroid. The contrast in structure may indicate separate ejection events. Using the angular expansion and Doppler velocities observed over four epochs spaced at one year intervals, we determine the distance to V723 Cas to be 3.85+0.23-0.21 kpc. We present the OSIRIS three-dimensional data here in many ways: as narrowband images, one- and two-dimensional spectra, and a volume rendering that reveals the true shape of the ejecta.Comment: 37 pages, 8 figure

Collective Home Office

Thesis: M. Arch., Massachusetts Institute of Technology, Department of Architecture, 2018.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student-submitted PDF version of thesis.Includes bibliographical references (pages 260-269).Collective Home Office is a collaborative practice whose working process tests the propositions it makes through architecture. As a group of friends, willing test subjects, a union of producers, a jury, a family, or an army, CHO explores the frictions and benefits of collectivity in both method and content. The three words that form its name provide a framework through which the practice engages with its context, questioning how the meanings of collective, home and office have been historically shaped. Targeting the agents most implicated in defining the current moment, namely the proto-state corporations, platforms and institutions that constitute Big Tech, CHO pitches a series of unsolicited projects to clients who are radically changing how we live and relate to one another. CHO believes that not only should these agents be held responsible for the drastic social and urban impacts they exert, but that they may become willing partners in designing new ways of living that respond to the social estrangement, imminent technological unemployment, and chronic housing crisis that have resulted from their unregulated conquest of market share. Far from neglecting the notion of collectivity, the tech world has appropriated its surplus value and replaced sharing with a sharing economy and then with a gig economy. The "capitalist collective" fails to recognize its misuse of the word; collectives differ greatly from memberships rosters. CHO believes that collectivity is a shared motivation towards a common goal. Fundamentally ideological, it is accrued over time through social intimacy built on shared experiences, both positive and negative. Spatially, this notion of the collective requires a new organizational strategy. Modeled on both the city and the home, forms of domestic urbanism are fostered by intimate encounters occurring at overlapping scales of interaction, redefining the notion of household. CHO focuses its practice on how this unlikely partnership can be used as an opportunity to rewire the collective with new priorities. Using the home office as a device, CHO emphasizes the increasing importance of care work and social grooming as means of coping with transitional post-work lifestyle no longer based on the binary of home and work.by Mary Lynch-Lloyd, Ching Ying Ngan [and] Maya Shopova.M. Arch

Racialized Rescue Narratives in Public Discourses on Youth Prostitution and Sex Trafficking in the United States

This article presents an analysis of how activists, politicians, and the media framed youth involvement in the sex trade during the 1970s, the 1990s, and the 2000s in the United States. Across these periods of public concern about the issue, similar framing has recurred that has drawn upon gendered and racialized notions of victimization and perpetration. This frame has successfully brought attention to this issue by exploiting public anxieties at historical moments when social change was threatening white male dominance. Using intersectional feminist theory, I argue that mainstream rhetoric opposing the youth sex trade worked largely within neoliberal logics, ignoring histories of dispossession and structural violence and reinforcing individualistic notions of personhood and normative ideas about subjectivity and agency. As part of the ongoing project of racial and gender formation in US society, this discourse has shored up neoliberal governance, particularly the build-up of the prison industrial complex, and it has obscured the state\u27s failure to address the myriad social problems that make youth vulnerable to the sex trade

The expanding dusty bipolar nebula around the nova V1280 Sco

V1280 Sco is one of the slowest dust-forming nova ever historically observed. We performed multi-epoch high-spatial resolution observations of the circumstellar dusty environment of V1280 Sco to investigate the level of asymmetry of the ejecta We observed V1280 Sco in 2009, 2010 and 2011 using unprecedented high angular resolution techniques. We used the NACO/VLT adaptive optics system in the J, H and K bands, together with contemporaneous VISIR/VLT mid-IR imaging that resolved the dust envelope of V1280 Sco, and SINFONI/VLT observations secured in 2011. We report the discovery of a dusty hourglass-shaped bipolar nebula. The apparent size of the nebula increased from 0.30" x 0.17" in July 2009 to 0.64" x 0.42" in July 2011. The aspect ratio suggests that the source is seen at high inclination. The central source shines efficiently in the K band and represents more than 56+/-5% of the total flux in 2009, and 87+/-6% in 2011. A mean expansion rate of 0.39+/-0.03 mas per day is inferred from the VISIR observations in the direction of the major axis, which represents a projected upper limit. Assuming that the dust shell expands in that direction as fast as the low-excitation slow ejecta detected in spectroscopy, this yields a lower limit distance to V1280 Sco of 1kpc; however, the systematic errors remain large due to the complex shape and velocity field of the dusty ejecta. The dust seems to reside essentially in the polar caps and no infrared flux is detected in the equatorial regions in the latest dataset. This may imply that the mass-loss was dominantly polar

Theoretical studies of 31P NMR spectral properties of phosphanes and related compounds in solution

Selected theoretical methods, basis sets and solvation models have been tested in their ability to predict 31P NMR chemical shifts of large phosphorous-containing molecular systems in solution. The most efficient strategy was found to involve NMR shift calculations at the GIAO-MPW1K/6-311++G(2d,2p)//MPW1K/6-31G(d) level in combination with a dual solvation model including the explicit consideration of single solvent molecules and a continuum (PCM) solvation model. For larger systems it has also been established that reliable 31P shift predictions require Boltzmann averaging over all accessible conformations in solution

Reproductive compensation in the evolution of plant mating systems

International audience• Reproductive compensation, the replacement of dead embryos by potentially viable ones, is known to play a major role in the maintenance of deleterious mutations in mammalian populations. However, it has received little attention in plant evolution. Here we model the joint evolution of mating system and inbreeding depression with reproductive compensation. • We used a dynamic model of inbreeding depression, allowing for partial purging of recessive lethal mutations by selfing. • We showed that reproductive compensation tended to increase the mean number of lethals in a population, but favored self-fertilization by effectively decreasing early inbreeding depression. When compensation depended on the selfing rate, stable mixed mating systems can occur, with low to intermediate selfing rates. • Experimental evidence of reproductive compensation is required to confirm its potential importance in the evolution of plant mating systems. We suggest experimental methods to detect reproductive compensation

Long-term weight loss following a randomised controlled trial of a weight management programme for men delivered through professional football clubs: the Football Fans in Training follow-up study

Background: Rising levels of obesity require interventions that support people in long-term weight loss. The Football Fans in Training (FFIT) programme uses loyalty to football teams to engage men in weight loss. In 2011/12, a randomised controlled trial (RCT) found that the FFIT programme was effective in helping men lose weight up to 12 months. Objectives: To investigate the long-term weight, and other physical, behavioural and psychological outcomes up to 3.5 years after the start of the RCT; the predictors, mediators and men’s qualitative experiences of long-term weight loss; cost-effectiveness; and the potential for long-term follow-up via men’s medical records. Design: A mixed-methods, longitudinal cohort study. Setting: Thirteen professional Scottish football clubs from the RCT and 16 additional Scottish football clubs that delivered the FFIT programme in 2015/16. Participants: A total of 665 men who were aged 35–65 years at the RCT baseline measures and who consented to follow-up after the RCT (intervention group, n = 316; comparison group, n = 349), and 511 men who took part in the 2015/16 deliveries of the FFIT programme. Interventions: None as part of this study. Main outcome measures: Objectively measured weight change from the RCT baseline to 3.5 years. Results: In total, 488 out of 665 men (73.4%) attended 3.5-year measurements. Participants in the FFIT follow-up intervention group sustained a mean weight loss from baseline of 2.90 kg [95% confidence interval (CI) 1.78 to 4.02 kg; p Additional co-authors: Colin McCowan, Alice McLean, Nanette Mutri

'Beyond places of safety' - a qualitative study exploring the implementation of mental health crisis care innovations across England

BACKGROUND: Mental health acute and crisis care consumes a large share of mental health budgets internationally but is often experienced as unsatisfactory and difficult to access. As a result, there is an increasing move towards developing innovative community crisis services, to improve patient experience and relieve pressure on inpatient and emergency services. This study aims to understand what helps and hinders the implementation of innovative mental health crisis care projects in England. METHODS: Using a qualitative approach, 18 interviews were conducted with crisis care service managers exploring their experiences and views of the development and implementation of their service developed with support from an English national capital funding programme. A framework analysis was conducted informed by implementation science. RESULTS: Key facilitators to implementation of innovative crisis services included bottom-up development, service user involvement, strong collaborative working, and leadership and management buy-in. Key barriers that affected the projects implementation included the complexities of crisis care, workforce challenges and resourcing issues. CONCLUSION: There is a recognised need to improve, update, and innovate current crisis care offers. Results from this study suggest that a range of models can help address the heterogenous needs of local populations and that new approaches can be implemented where they utilise a whole-systems approach, involving service users and relevant professional stakeholders beyond mental health services in planning and developing the service

Pollution, habitat loss, fishing and climate change as critical threats to penguins

Cumulative human impacts across the world’s oceans are considerable. We therefore examined a single model taxonomic group, the penguins (Spheniscidae), to explore how marine species and communities might be at risk of decline or extinction in the southern hemisphere. We sought to determine the most important threats to penguins and to suggest means to mitigate these threats. Our review has relevance to other taxonomic groups in the southern hemisphere and in northern latitudes, where human impacts are greater. Our review was based on an expert assessment and literature review of all 18 penguin species; 49 scientists contributed to the process. For each penguin species, we considered their range and distribution, population trends, and main anthropogenic threats over the past approximately 250 years. These threats were harvesting adults for oil, skin, and feathers and as bait for crab and rock lobster fisheries; harvesting of eggs; terrestrial habitat degradation; marine pollution; fisheries bycatch and resource competition; environmental variability and climate change; and toxic algal poisoning and disease. Habitat loss, pollution, and fishing, all factors humans can readily mitigate, remain the primary threats for penguin species. Their future resilience to further climate change impacts will almost certainly depend on addressing current threats to existing habitat degradation on land and at sea. We suggest protection of breeding habitat, linked to the designation of appropriately scaled marine reserves, including in the High Seas, will be critical for the future conservation of penguins. However, large-scale conservation zones are not always practical or politically feasible and other ecosystem-based management methods that include spatial zoning, bycatch mitigation, and robust harvest control must be developed to maintain marine biodiversity and ensure that ecosystem functioning is maintained across a variety of scales.Los impactos humanos acumulativos a lo largo de los océanos del planeta son considerables. Por eso examinamos un solo modelo de grupo taxonómico, los pingüinos (Sphenischidae), para explorar cómo las especies y las comunidades marinas pueden estar en riesgo de disminuir o de extinguirse en el hemisferio sur. Buscamos determinar la amenaza más importante para los pingüinos y sugerir métodos para mitigar estas amenazas. Nuestra revisión tiene relevancia para otros grupos taxonómicos en el hemisferio sur y en las latitudes norteñas, donde los impactos humanos son mayores. Nuestra revisión se basó en una evaluación experta y una revisión de literaratura de las 18 especies de pingüinos; 49 científicos contribuyeron al proceso. Para cada especie de pingüino, consideramos su rango y distribución, tendencias poblacionales y las principales amenazas antropogénicas en aproximadamente los últimos 250 años. Estas amenazas fueron la captura de adultos para obtener aceite, piel y plumas y el uso como carnada para la pesca de cangrejos y langostas: la recolección de huevos; la degradación del hábitat terrestre; la contaminación marina; la pesca accesoria y la competencia por recursos; la variabilidad ambiental y el cambio climático; y el envenenamiento por algas tóxicas y enfermedades. La pérdida de hábitat, la contaminación y la pesca, todos factores que los humanos pueden mitigar, siguen siendo las amenazas principales para las especies de pingüinos. Su resiliencia futura a más impactos por cambio climático dependerá certeramente de que nos enfoquemos en las amenazas actuales a la degradación de hábitats existentes en tierra y en el mar. Sugerimos que la protección de hábitats de reproducción, en conjunto con la designación de reservas marinas de escala apropiada, incluyendo alta mar, será crítica para la conservación futura de los pingüinos. Sin embargo, las zonas de conservación a gran escala no son siempre prácticas o políticamente viables, y otros métodos de manejo basados en ecosistemas que incluyen la zonificación espacial, la mitigación de captura accesoria, y el control fuerte de captura deben desarrollarse para mantener la biodiversidad marina y asegurar que el funcionamiento de los ecosistemas se mantenga a lo largo de una variedad de escalas.Fil: Trathan, Phil N.. British Antartic Survey; Reino UnidoFil: Garcia Borboroglu, Jorge Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Boersma, P. Dee. University of Washington; Estados UnidosFil: Bost, Charles André. Centre d´Etudes Biologiques de Chizé; FranciaFil: Crawford, Robert J. M.. Department of Environmental Affairs; SudáfricaFil: Crossin, Glenn T.. Dalhousie University Halifax; CanadáFil: Cuthbert, Richard. Royal Society for the Protection of Birds; Reino UnidoFil: Dann, Peter. Phillip Island Nature Parks; AustraliaFil: Davis, Lloyd Spencer. University Of Otago; Nueva ZelandaFil: de la Puente, Santiago. Universidad Cayetano Heredia; PerúFil: Ellenberg, Ursula. University Of Otago; Nueva ZelandaFil: Lynch, Heather J.. Stony Brook University; Estados UnidosFil: Mattern, Thomas. University Of Otago; Nueva ZelandaFil: Pütz, Klemens. Antarctic Research Trust; AlemaniaFil: Seddon, Philip J.. University Of Otago; Nueva ZelandaFil: Trivelpiece, Wayne. Southwest Fisheries Science Center; Estados UnidosFil: Wienecke, Bárbara. Australian Antarctic Division; Australi