Les acteurs de marché font-ils la ville ?:Projet de numéro spécial soumis et accepté par la revue Espacestemps.net

La ville est-elle construite et organisée par le marché ? De nombreux travaux, anciens et plus récents, ont montré la pertinence d'une entrée par le marché pour rendre compte des transformations de la ville. Certains se sont attachés à rendre compte des effets sur les territoires urbains des dynamiques de mondialisation et des transformations du capitalisme. D'autres se sont interrogés sur le rôle de l'argent dans le fonctionnement quotidien de la ville, ou encore sur les effets du marché sur la transformation des formes urbaines. Ce numéro spécial entend contribuer au débat de manière originale à travers plusieurs choix de positionnement, communs aux contributeurs. Tout d'abord, il part du postulat qu'un positionnement intermédiaire, centré sur les acteurs de marché, constitue un point de départ heuristique pour explorer les transformations urbaines en cours. Ensuite, la perspective interdisciplinaire qui caractérise ce projet (géographie, urbanisme, science politique, sociologie, économie urbaine, ethnologie, histoire) permet de revisiter ces questionnements classiques. Enfin, il entend mettre au premier plan les enjeux épistémologiques et méthodologiques soulevés par l'analyse du marché dans la ville, lesquels sont souvent relégués au second plan ou abordés en creux par la recherche urbaine. L'objet de ce numéro spécial consiste à questionner les choix opérés par la recherche urbaine à partir de cas empiriques et de postures de recherche contrastés. La diversité assumée des postures de recherche donnera lieu, dans chacune des contributions, à un effort de réflexivité sur la démarche de recherche et les catégories d'analyse privilégiées.http://blogs.sciences-po.fr/recherche-villes/2011/10/21/charlotte-halpern-et-julie-pollard-2011-les-acteurs-de-marche-font-ils-la-ville/Working paper du Programme Villes & Territoires de Sciences Po - Suite d'articlesEcole thématique CNRS (subvention 2010

Les acteurs de marché font-ils la ville ?

La ville est-elle construite et organisée par les acteurs de marché ? Qui sont-ils, et comment les caractériser ? Leurs stratégies guident-elles le développement urbain ? Comment s'imposent-ils ou composent-ils avec les pouvoirs publics et la société civile ? Une longue tradition de recherche urbaine s'attache au marché dans la ville, ainsi que le rappelle l'article introductif de cette Traverse. Mais si les acteurs paraissent, de manière directe ou en filigrane, jouer un rôle important dans les dynamiques et transformations observées, la question des acteurs de marché n'est souvent abordée que de manière indirecte ou marginale. A partir de perspectives disciplinaires variées, cette Traverse s'interroge sur la dimension heuristique d'une entrée par les acteurs pour appréhender le marché dans la ville. Cette diversité assumée montre que cette entrée fait sens pour des sociologues, des politistes aussi bien que pour des géographes, des ethnologues, des économistes ou encore des historiens. Et que ces différents éclairages disciplinaires se complètent.This article uses the notion of urban market actors as an organizing concept so as to systematically examine the rhythms, scope, and direction of urban change. It argues that an analysis based on the detailed characterization of urban market actors may contribute to understanding evolving state-market dynamics in European cities. This analytic choice shifts the usual point of view, empirically exploring the place of the market in urban policy transformations and making it possible to surmount some of the roadblocks and contradictions that have appeared in urban research. By bringing together geographers, political scientists, sociologists and economists, this special issue also demonstrates the notion's heuristic value for various disciplines and the extent to which they might complement one another in order to deepen their understanding of market actors in the city.Introduction d'un numéro spécial Traverse : Ville et marché (6 articles au total).Ecole thématique CNRS " Le marché fait-il la ville ? ", 1&2 decembre 2010, organisée conjointement par les laboratoires PACTE/Sciences Po Grenoble, LATTS/Université Marne-la-Vallée et LASUR/EPF

The manufacture of honeycomb cores using Fused Deposition Modeling

Sandwich panels are used in many industries for the advantageous properties of high stiffness, good strength to weight ratio, and impact resistance. This paper investigates properties of thin-walled cores manufactured through Fused Deposition Modeling (FDM); a process which, through a wider design space, could improve the functionality of sandwich panels. The bond strength between the layers of thin walls manufactured through FDM was evaluated through tensile testing. To measure the effect of modified manufacturing speeds, wall thicknesses were varied through the flow rate and nozzle speed. Honeycomb cores using FDM were produced with different toolpaths, and compared with an example of an industry standard Nomex honeycomb core. During tensile testing, thick-walled FDM components exhibited a more ductile failure with a lower yield point when compared to thinner specimens. The ultimate tensile stress remained constant across samples within each of the tested ABS and PLA polymers used. Honeycomb cores produced using FDM were found to have a higher compressive failure force than Nomex honeycomb, and a lower specific strength. The force–displacement curves of compressive failure show a ductile response for thick specimens, consistent with the previous result. These results, combined with the increased flexibility of additive manufacture technologies, could provide a method of manufacturing high strength cores with complex geometry

The manufacture of honeycomb cores using Fused Deposition Modeling

Sandwich panels are used in many industries for the advantageous properties of high stiffness, good strength to weight ratio, and impact resistance. This paper investigates properties of thin-walled cores manufactured through Fused Deposition Modeling (FDM); a process which, through a wider design space, could improve the functionality of sandwich panels. The bond strength between the layers of thin walls manufactured through FDM was evaluated through tensile testing. To measure the effect of modified manufacturing speeds, wall thicknesses were varied through the flow rate and nozzle speed. Honeycomb cores using FDM were produced with different toolpaths, and compared with an example of an industry standard Nomex honeycomb core. During tensile testing, thick-walled FDM components exhibited a more ductile failure with a lower yield point when compared to thinner specimens. The ultimate tensile stress remained constant across samples within each of the tested ABS and PLA polymers used. Honeycomb cores produced using FDM were found to have a higher compressive failure force than Nomex honeycomb, and a lower specific strength. The force–displacement curves of compressive failure show a ductile response for thick specimens, consistent with the previous result. These results, combined with the increased flexibility of additive manufacture technologies, could provide a method of manufacturing high strength cores with complex geometry

Biochemical and clinical response after umbilical cord blood transplant in a boy with early childhood-onset beta-mannosidosis.

BACKGROUND: Deficiency in the enzyme β-mannosidase was described over three decades ago. Although rare in occurrence, the presentation of childhood-onset β-mannosidase deficiency consists of hypotonia in the newborn period followed by global development delay, behavior problems, and intellectual disability. No effective pharmacologic treatments have been available. METHODS: We report 2-year outcomes following the first umbilical cord blood transplant in a 4-year-old boy with early childhood-onset disease. RESULTS: We show restoration of leukocyte β-mannosidase activity which remained normal at 2 years posttransplant, and a simultaneous increase in plasma β-mannosidase activity and dramatic decrease in urine-free oligosaccharides were also observed. MRI of the brain remained stable. Neurocognitive evaluation revealed test point gains, although the magnitude of improvement was less than expected for age, causing lower IQ scores that represent a wider developmental gap between the patient and unaffected peers. CONCLUSION: Our findings suggest that hematopoietic cell transplant can correct the biochemical defect in β-mannosidosis, although preservation of the neurocognitive trajectory may be a challenge

Developing SASSA: a Soil Analysis Support System for Archaeologists

A constant problem for field archaeologists is the need for familiarity with the core concepts of a diverse range of specialist disciplines. Soils and sediments are an integral part of archaeological sites, yet the teaching of soils in archaeology degrees is variable and many archaeologists complain they are lacking in the confidence and skills required to describe and interpret the deposits they excavate. SASSA (Soil Analysis Support System for Archaeologists) is a free-to-use, internet based system designed to familiarise archaeologists with the concepts and possibilities offered by geoarchaeology (the scientific study of soils and sediments). SASSA consists of two core components: the knowledge base and field tool. The ‘front-end’ of the website is the knowledge base; this uses Wiki technology to allow users to add their own content and encourage dialogue between archaeologists and geoarchaeologists. Whilst the field tool uses an XML data structure and decision tree, decision support system to guide the user through the process of describing and interpreting soils and sediments. SASSA is designed for use on both ‘static’ (PC) and ‘mobile’ (PDA and laptop) hardware in order to provide in-situ field support as well as offering office-based ‘reference book style’ help. This article introduces the aims of SASSA, presents SASSA as a user might experience it, and discusses the computing technology used to construct the system

A comparison of FDM structural layouts and implementation of an open-source arm-based system

Fused Deposition Modelling (FDM) is a manufacturing process to build components in a layer-by-layer approach through extrusion of polymers from a movable nozzle, allowing for significantly higher degrees of complexity over machined parts. Current FDM systems typically use actuation provided through a gantry or delta structural layout, operating through depositing successive planar layers in a 2.5D process; it has been shown in numerous studies the bonding between layers has significantly lower strength than the homogeneous material or in-plane properties - an issue which can be mitigated through the deposition of curved layers. This paper compares four differing structural layouts of FDM systems (gantry, delta, Stewart Platform, and arm-based) to identify the key advantages of an arm-based method as the increased workspace and manipulability enabling “Additive Finalisation” of components, and suitability for curved layer FDM. Details are then presented of the open-source implementation and evaluation of a 6 degree-of-freedom arm-based FDM printer at the University of Bristol

Prospectus, October 10, 1979

WORLD PREMIERE AT PC; WPCD Top 20; Foreigners plan celebration; Stugo surveys spring break; S.T.O. to give keg in raffle; Leslie views Parkland as an advantage; Survey will help design new food facilities; Nursing gets rolling with record enrollment; Child rearing at PC; Parkland Food Survey; Three part life at PC; Calif. group at PC Tues.; Avionics meeting; Feature: Numbers unimportant, just good music for Irish; Rally for no taxes Monday; Concerts: Kansas stages show; WPCD to add new program; Classifieds; EMT workshop conducted at PC; Prospectus to publish Images; Reviews: \u27Runner\u27 doesn\u27t stumble, Python religion, Buffest sings about islands, and islands, Talking Heads unafraid of the fear of music; V-ball sees the light, look for good week; Women Cobras prepare for season; Freddy continues loss skein; Fast Freddy Contest; Intramural Standingshttps://spark.parkland.edu/prospectus_1979/1009/thumbnail.jp