Examining Groundtrack Geometry Transitions by Evaluating the Number of Longitude-Rate Zeros

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76356/1/AIAA-34089-698.pd

Locals Only

"Developed by Justin Langlois, for AKA in collaboration with CHEP Good Food Inc., Locals Only is a large-scale multi-year art project that explores food security, community-led resource development, and intergenerational exchange in Saskatoon’s core neighbourhoods." -- Publisher's web site

Inflationary solutions in the brane-world and their geometrical interpretation

We consider the cosmology of a pair of domain walls bounding a five-dimensional bulk space-time with negative cosmological constant, in which the distance between the branes is not fixed in time. Although there are strong arguments to suggest that this distance should be stabilized in the present epoch, no such constraints exist for the early universe and thus non-static solutions might provide relevant inflationary scenarios. We find the general solution for the standard ansatz where the bulk is foliated by planar-symmetric hypersurfaces. We show that in all cases the bulk geometry is that of anti-de Sitter (AdS_5). We then present a geometrical interpretation for the solutions as embeddings of two de Sitter (dS_4) surfaces in AdS_5, which provide a simple interpretation of the physical properties of the solutions. A notable feature explained in the analysis is that two-way communication between branes expanding away from one another is possible for a finite amount of time, after which communication can proceed in one direction only. The geometrical picture also shows that our class of solutions (and related solutions in the literature) are not completely general, contrary to some claims. We then derive the most general solution for two walls in AdS_5. This includes novel cosmologies where the brane tensions are not constrained to have opposite signs. The construction naturally generalizes to arbitrary FRW cosmologies on the branes.Comment: 24 pages, 9 figure

Justin A. Langlois — Uselessness & Antagonism: Suggestions for a New Engagement

There is no exchange value to something useless. It strives to impede, slow down, and malfunction. Uselessness is unabsorbable. It destabilizes the substrate into which it is brought and adds unnecessary complexity, weight, and time to a transaction. We have to wonder, when so many forms of resistance, aesthetics, logic, and affect have been co-opted by highly-distributed, violent, and autonomous expressions of power and infrastructures, what room is there left for action within legible forms of art, activism, and education? This lecture explores the possibilities for uselessness and antagonism to act as increasingly vital options for creative intervention in these spaces and in everyday life. Antagonistic social practices and useless engagements may most readily and effectively help us develop the spaces of exchange that can best cultivate the capacity for critical engagement with our cities, infrastructure, and communities.&nbsp

Le partage et la mise en commun des données de santé : quels enjeux pour un objectif d’innovation sociale responsable ?

L’émergence des technologies numériques accentue la volonté d’un usage partagé et d’un modèle de gouvernance de données de santé. Les technologies numériques et d’intelligence artificielle (IA) transforment les capacités d’action et accentue les (nouveaux) enjeux autour de cette mise en commun des données par et pour différents acteurs générant des communs de la connaissance et de l’innovation. Des perspectives inédites s’ouvrent ainsi et de nouvelles alliances se tissent remettant en question tant nos modes de gouvernance que les nouveaux communs qui apparaissent. Au Québec et ailleurs, des initiatives ont pris forme en matière de partage et de mutualisation des données de santé pour les fins de recherche telles que PULSAR, CITADEL, PARS3, etc.Cet article poursuit trois objectifs : 1) Illustrer les mécanismes de partage et de mise en commun des données en santé à des fins de recherche dans une perspective juridique, éthique et managériale ; 2) Réfléchir au concept de bien(s) commun(s) derrière ces mécanismes de gouvernance et les nouvelles perspectives de développement qui ont cours sous le prisme de l’éthique et de l’action publique ; 3) Proposer des lignes directrices pour un cadre responsable d’utilisation secondaire des données de santé.The emergence of digital technologies is accentuating the demand for a shared usage and governance model for health data. Digital and artificial intelligence (AI) technologies are transforming the capacity for action and empathizing new challenges surrounding the pooling of data by and for various stakeholders, generating common knowledge and innovation. New perspectives are thus opening up, and new alliances are forming, questioning both our governance methods and the emerging commons. In Quebec and elsewhere, initiatives have taken shape in the sharing and pooling of health data for research purposes, such as PULSAR, CITADEL, PARS3, etc. This article pursues three objectives: 1) To illustrate the mechanisms of sharing and pooling health data for research from a legal, ethical, and managerial perspective; 2) To reflect on the concept of common good(s) behind these governance mechanisms and the new development perspectives that are emerging under the prism of ethics and public action; 3) To propose guidelines for a responsible framework for the secondary use of health data

Extracellular chaperones and proteostasis

There is a family of currently untreatable serious human diseases that arise from the inappropriate misfolding and aggregation of extracellular proteins. At present our understanding of mechanisms that operate to maintain proteostasis in extracellular body fluids is limited but has significantly advanced with the discovery of a small but growing family of constitutively secreted extracellular chaperones (ECs). The available evidence strongly suggests that these chaperones act as both sensors and disposal-mediators of misfolded proteins in extracellular fluids, thereby normally protecting us from disease pathologies. It is critically important to further increase our understanding of the mechanisms that operate to effect extracellular proteostasis, as this will be essential knowledge upon which to base the development of effective therapies for some of the world\u27s most debilitating, costly and intractable diseases

Make Things Happen: Activity Sheets

Make Things (Happen) is a participatory project organized by Christine Wong Yap featuring artist-created activity sheets to make things or make things happen. Make Things (Happen) is intended to multiply creative activity. It began with artists creating activity sheets—downloadable from a website, and freely available as photocopies in the exhibition—for anyone and everyone to use and share, encouraging further activation. Organized by Christine Wong Yap featuring artist-created activity sheets by Lauren F. Adams, Oliver Braid, Maurice Carlin, Kevin B. Chen, Torreya Cummings, Helen de Main, double zero, Bean Gilsdorf, Galeria Rusz, Sarrita Hunn, Maria Hupfield, Ariana Jacob, Hannah Jickling & Helen Reed, Nick Lally, Justin Langlois, Justin Limoges, Jessica Longmore, Mail Order Brides/M.O.B., Kari Marboe & Erik Scollon, Betty Marín, Mark Anthony Martinez, Meta Local Collaborative, Melissa Miller, Roy Meuwissen, Laura Napier, Susan O’Malley, Dionis Ortiz, Kristina Paabus, Piero Passacantando, Julie Perini, Ryan Pierce, Pavel Romaniko, Risa Puno, Genevieve Quick, Mary Rothlisberger, Pallavi Sen, Elisabeth Smolarz, Tattfoo Tan, Lauren Marie Taylor, sharita towne, Emilio Vavarella, David Gregory Wallace, Lexa Walsh, Alex Wilde & Emily Chappell, Brian Zegeer, Lu Zhang.https://pdxscholar.library.pdx.edu/make_things_happen/1000/thumbnail.jp

Colonization of a newly developing salt marsh: disentangling independent effects of elevation and redox potential on halophytes

Many characteristics of the salt marsh environment covary with elevation. It has therefore proved difficult to determine which environmental characteristics limit the distributions of particular species in the field. Oxygen supply to the rhizosphere may be particularly important, as it is determined by the duration and frequency of flooding. The re-activation of a salt marsh by managed coastal realignment provided an opportunity to investigate the large-scale manipulation of environmental effects on halophyte distribution in a situation where the usual relationships between environmental characteristics, elevation and succession had been partially uncoupled. Most locations sampled lay between mean neap and mean spring tidal levels. As expected, anoxic conditions occurred at lower elevation, redox potential increased generally with elevation and sediments were oxic on the upper parts. However, sediment oxygenation at any given elevation was variable, particularly at intermediate levels in the tidal range. This imperfect correlation between elevation and sediment redox allowed quantification of their independent effects on species distributions using the statistical technique of Hierarchical Partitioning. Effects of elevation and sediment redox potential were distinguishable from each other. Salicornia europaea occurred predominantly at lower elevation but was not influenced by redox potential. Puccinellia maritima favoured low redox potentials independently of elevation. In contrast, Suaeda maritima tolerated a wide range of elevations but was absent from areas with low redox potential. Atriplex portulacoides was apparently more averse to low redox potential than to low elevation. Elytrigia atherica was restricted to both high redox potential and high elevation. Smaller independent effects of sediment depth, salinity, water content, nitrate concentration, shear strength and loss on ignition were apparent for some species. Synthesis. Although much of the elevational zonation of species on salt marshes is mediated by differential tolerance of the consequences of co-linearly varying variables, particularly sediment anoxia and elevation, these variables have independent effects that are quantifiable in the field. Hierarchical Partitioning provides a valuable tool for distinguishing the mechanisms underlying species zonations on environmental gradients, especially where large-scale environmental manipulations have partially decoupled the usual co-linear variation