564 research outputs found
La configuration des pratiques d'information selon la logique des situations.
International audienceHow are information practices distributed around successive uses of different media? In this article the author posits that the selection of information sources cannot be explained only in terms of the cultural legitimacy of that information or of individuals' socio-demographic profiles. He argues that the selection of media, and the uses to which they are put, are also based on opportunities in everyday situations. Through several paradigmatic examples, he describes how these opportunities correspond to local affordances, whether in the general environment consisting mainly of the media and ICT, or in the possibility of using a medium in the presence of other people and simultaneously doing something else.Comment s'opĂšre la distribution des pratiques d'information autour des usages successifs de diffĂ©rents supports mĂ©diatiques ? Dans cet article, nous dĂ©veloppons l'hypothĂšse selon laquelle la sĂ©lection des sources d'information ne peut pas ĂȘtre uniquement expliquĂ©e Ă partir de leur lĂ©gitimitĂ© culturelle et des profils sociodĂ©mographiques des individus. Nous avançons l'idĂ©e que cette sĂ©lection des supports d'information, et les usages qui en sont faits, prennent Ă©galement appui sur des opportunitĂ©s puisĂ©es dans les situations quotidiennes. A travers plusieurs exemples paradigmatiques, nous tentons de dĂ©crire comment ces opportunitĂ©s rĂ©pondent Ă des prises situĂ©es localement : que ce soit l'environnement ambiant, formĂ© notamment par les mĂ©dias et les TIC Ă disposition, ou que ce soit la possibilitĂ© d'utiliser un support en prĂ©sence d'autres personnes et en conduisant d'autres activitĂ©s
ECF FARMSYSTEMS: a Circular Economy Business Model Case
ECF is a very Small-and-Medium sized Enterprise which operates an aquaponic urban farm
o Aquaponic food production is an industrial symbiosis within its own operations,
exchanging material flows between the aquaculture and the hydroponic one. This
may be considered as a co-product recovery business model pattern
§ The circularity is retained within ECFâs own operations and there is little value
exchange among parties other than commercial ones
o Socio-demographic factors such as growing population, growing urbanisation,
alongside environmental ones such as competition for arable land, biodiversity loss,
over-fishing, agro-chemicals in food production and others are the contextual drivers
for aquaponics as a successful CEBM.
o Characteristics of ECFâs industrial symbiosis/co-product recovery CEBM pattern:
§ Enables ECF to deliver its value proposition, namely to offer resource-efficient
food on a B2B basis as an urban farm as well as a high level of transparency
through story-telling around sourcing for its customers
§ Technology and know-how play a role in achieving the symbiosis
§ A significant socio-environmental impact is achieved through displacement of
food miles and inherent resource-efficiency of aquaponics
§ Fish feed faces its own sustainability challenges; to be answered if ECF is to
aspire to greater circularity
§ ECF as a successful pioneer of aquaponic farms is leveraging its know-how to
design, plan and build turnkey farms for 3rd parties, thereby demonstrating
the replicability of the CEBM.
o Support for traditional (unsustainable) farming and fishing (including fuel subsidies) is
impacting the competitiveness of aquaponics, as is the lack of transparency on âfood
milesâ.
o Whereas urban communities wish to become greener, urban farming such as
aquaponics faces many planning and permissioning hurdles, despite growing demand
from B2B and B2C consumer
REHAU AG + CO (& POLYSECURE GMBH): A Circular Economy Business Model Case
This report looks into the Circular Economy Business Model (CEBM) of Rehau AGâs window
solutions division. This is, within the Rehau group, the business unit which manufactures PVC
profiles which are used, later by their customers, to frame window glass in domestic and
commercial buildings.
The case-study has examined internal and external operations related to PVC profile production,
usage and recycling; interviews with relevant managers took place.
Given sustainability and cost considerations surrounding PVC, Rehau practices a circular sourcing
CEBM involving the whole value-chain in particular downstream actors such as customers and
recyclers.
o PVC profiles are delivered to its customers, the window manufacturers, from whom it
recovers the cuttings (the âpost-industrialâ waste / resource). This is financially
incentivised and enables Rehau to melt, re-granulate and re-extrude, i.e. use as a
secondary raw material in a circular sourcing process.
o Due to a long-standing landfill ban in Germany of PVC, the recovery and recycling of
âpost-consumerâ waste, is a well-organised business, in which, take-back of end-oflife
PVC window frames, is financially incentivised. The recycler shreds, melts and regranulates
this resource into a PVC-recyclate, i.e. a secondary raw material. Rehau,
and other PVC extruders, are keen to purchase this recyclate since it is some 20%
cheaper than virgin PVC. Apart from mild discolouring, properties of virgin PVC are
practically maintained in the recyclate.
o Rehau has innovated by introducing glass-fibre to reinforce PVC and thereby dispense
with steel content in window profiles. Such glass-fibre PVC (GF-PVC) window profiles
present a number of advantages in terms of lightness, thermal insulation and cost of
installation. To recover this new type of PVC, a specific tracing and sorting technology
has been implemented in cooperation with a technology provider. Indeed, Polysecure
GmbHâs tracer-based sorting approach is an enabling technology which, thanks to a
micrometric marker powder, is physically bonded to the raw material on a permanent
basis, and enables identification and sorting at End-of-Life. Thus a glass-fibre PVC
recyclate can be generated as a new pure segregated secondary raw material fractio
Les formes d'inscription des usages de la TV sur mobile dans les déplacements quotidiens
Cette Ă©tude dĂ©crit les usages de la Mobile TV en situation de mobilitĂ©. Elle montre comment les participants articulent ces usages pionniers avec leurs pratiques mĂ©diatiques prĂ©existantes, dĂ©veloppĂ©es autour de la presse Ă©crite, pour palier aux contraintes d'utilisation : problĂšmes de la rĂ©ceptivitĂ© du rĂ©seau 3G, faible autonomie des batteries, intrusivitĂ© de l'Ă©coute, postures de rĂ©ception inconfortables, etc. Ils dĂ©veloppent ainsi des arts de faire opportunistes consistant Ă contourner les contraintes d'usage en bifurquant d'un support mĂ©diatique Ă l'autre pour dĂ©velopper des usages les plus en phase possibles avec leurs goĂ»ts mĂ©diatiques. Le statut particulier des tĂ©lĂ©phones multimĂ©dias, dans cette Ă©conomie de leurs pratiques, tient au fait qu'ils constituent des opportunitĂ©s de divertissement qui peuvent ĂȘtre exploitĂ©es sans prĂ©mĂ©ditation puisqu'ils Ă©quipent continuellement leurs dĂ©placements
: Les mises en scĂšne audiovisuelles des fusillades dans les Ă©coles
International audienceLe présent article décrit la façon dont les auteurs de fusillades dans les écoles ont pu diffuser des vidéos, avant de passer à l'acte, grùce aux ressources des médias participatifs. Ces personnes tentent de « préméditer » leur tuerie en proposant aux entreprises de presse des scénarisations audiovisuelles de leur identité et de leur projet meurtrier. L'analyse détaillée de ces scénarisations révÚle comment elles exploitent les ressorts performatifs de slogans ou de référents culturels pour conférer une portée politique à leur passage à l'acte dans la « violence expressive »
La commémoration des "mauvais morts" au sein des sanctuaires spontanés numériques
International audienceCette contribution montre comment les internautes investissent les mĂ©dias participatifs, durant le traitement mĂ©diatique des tueries dans les Ă©coles, pour publier des montages audiovisuels et des commentaires en hommage aux " mauvais morts ", aux innocents tuĂ©s sans raison. L'effervescence participative suscitĂ©e par ces Ă©vĂ©nements se traduit par la publication de milliers de commĂ©morations audiovisuelles qui agencent, par exemple au sein de YouTube, une forme de sanctuaire spontanĂ© qui peut ĂȘtre qualifiĂ©e de numĂ©rique. Nous montrons comment l'agencement de ces sanctuaires, grĂące aux ressources de la folksonomie, renouvĂšle les rituels funĂ©raires, notamment les rituels mĂ©diatiques grĂące auxquels la mĂ©moire des victimes est commĂ©morĂ©e
MPAgenomics : An R package for multi-patients analysis of genomic markers
MPAgenomics, standing for multi-patients analysis (MPA) of genomic markers,
is an R-package devoted to: (i) efficient segmentation, and (ii) genomic marker
selection from multi-patient copy number and SNP data profiles. It provides
wrappers from commonly used packages to facilitate their repeated (sometimes
difficult) use, offering an easy-to-use pipeline for beginners in R. The
segmentation of successive multiple profiles (finding losses and gains) is
based on a new automatic choice of influential parameters since default ones
were misleading in the original packages. Considering multiple profiles in the
same time, MPAgenomics wraps efficient penalized regression methods to select
relevant markers associated with a given response
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