Search results for "led"
showing 10 items of 8768 documents
Modelling flow and heat transfer in spacer-filled membrane distillation channels using open source CFD code
2013
Abstract A good understanding of the details of hydrodynamic and heat transport conditions and their impact on temperature polarisation and pressure drops is essential for optimum design of membrane distillation (MD) modules. To this end, the present work reports on initial progress in the development of a tool for 3D simulation of spacer-filled MD channels based on the open source CFD code library OpenFOAM. The paper discusses a number of modelling and implementation aspects including model geometry and computational domain, choice of boundary conditions, and discretisation schemes. The results pertaining to the effect of three different spacer types on the fluid dynamics and heat transfer…
Friction and Heat Transfer in Membrane Distillation Channels: An Experimental Study on Conventional and Novel Spacers
2022
The results of an experimental investigation on pressure drop and heat transfer in spacer-filled plane channels, which are representative of Membrane Distillation units, are presented and discussed. Local and mean heat transfer coefficients were obtained by using Thermochromic Liquid Crystals and Digital Image Processing. The performances of a novel spacer geometry, consisting of spheres that are connected by cylindrical rods, and are hereafter named spheres spacers, were compared with those of more conventional woven and overlapped spacers at equal values of the Reynolds number Re (in the range ~150 to ~2500), the pitch-to-channel height ratio, the flow attack angle and the thermal boundar…
Continuum: A spatiotemporal data model to represent and qualify filiation relationships
2013
International audience; This work introduces an ontology-based spatio-temporal data model to represent entities evolving in space and time. A dynamic phenomenon generates a complex relationship network between the entities involved in the process. At the abstract level, the relationships can be identity or topological filiations. The existence of an identity filiation depends on whether the object changes its identity or not. On the other hand, topological filiations are based exclusively on the spatial component, like in the case of growth, reduction, merging or splitting. When combining identity and topological filiations, six filiation relationships are obtained, forming a second abstrac…
Collaborative Design Rational and Social Creativity in Cultures of Participation
2011
The rise in social computing has facilitated a shift from consumer cultures, focused on producing finished media to be consumed passively, to cultures of participation, where people can access the means to participate actively in personally meaningful problems. These developments represent unique and fundamental opportunities and challenges for rethinking and reinventing design rationale and creativity, as people acclimate to taking part in computer-mediated conversations of issues and their solutions. Grounded in our long-term research exploring these topics, this paper articulates arguments, describes and discusses conceptual frameworks and system developments (in the context of three cas…
Combining spatial prioritization and expert knowledge facilitates effectiveness of large-scale mire protection process in Finland
2020
Conservation resource allocation involves a complex set of considerations including species, habitats, connectivity, local to global biodiversity objectives, alternative protection and restoration actions, while requiring cost-efficiency and effective implementation. We present a national scale spatial conservation prioritization analysis for complementing the network of protected mires in Finland. We show how spatial prioritization coupled with regional targets and expert knowledge can facilitate structured decision-making. In our application, discussion between experts was structured around the prioritization model enabling integration of quantitative analysis with expert knowledge. The u…
Sharing and disseminating knowledge of advanced spatial modelling. Presentation of an action carried out by the European research group S4 (spatial s…
2006
International audience; The European research group S4 (Spatial simulation for social sciences) gathers researchers in geography as well as in geographical information sciences coming from about 30 European research centres. One action of the European research group S4 consists in sharing and disseminating knowledge of advanced spatial modelling. We propose here to describe several aspects of this action that are of interest considering the objectives of the CAENTI. The first aim of the action is to improve the diffusion of the results of the research in advanced spatial modelling, particularly in direction of regional and urban management and planning. The second aim is the development of …
Zilās gaismas spektra nozīme gaismas pieskaņošanā
2022
Bakalaura darbs ir uzrakstīts latviešu valodā uz 29 lapaspusēm. Tas satur 24 attēlus, 1 tabulu, 21 atsauces uz literatūras avotiem. Mērķis bija noteikt vai zilās gaismas spektra daļēju aizstāšanai ar ciāna spektru ir ietekme uz gaismas pieskaņošanas testa veikšanu. 20 dalībnieki piedalījās pētījumā, kurā veica gaismas pieskaņošanas testu dažādos gaismas līmeņos, to uzdevums bija pieskaņot divus gaismas stimulus līdz tādam brīdim, kad vairs nav novērojamas atšķirības starp abiem gaismas stimuliem. Dalībnieki veica mērījumus 3 sesijās kopa apskatot 45 gaismas stimulus.
Carboxylic derivatives of spin-crossover complexes in switchable materials and surfaces
2022
Los compuestos de transición de espín (SCO, de las siglas en inglés spin-crossover) son un ejemplo perfecto de biestabilidad molecular. La transición entre sus estados de alto y bajo espín (HS y LS, de las siglas en inglés, High Spin y Low Spin, respectivamente) se puede controlar mediante estímulos externos como la temperatura, presión, luz, por nombrar unos pocos. Esto los convierte en compuestos muy interesantes para aplicaciones tales como espintrónica, almacenamiento de memoria y dispositivos conmutables. El interés científico en este tipo de moléculas y la búsqueda de aplicaciones ha ido creciendo a lo largo de los años. Para ello, la deposición de dichos compuestos es el primer paso …
La tutela delle pari opportunità per gli atleti con disabilità nel D.LGS. 28 febbraio 2021, n. 36
2021
The article analyzes the changes to the discipline on protection of disabled athletes included in military and state sports groups introduced by the Sport Reform Act
Sport e soggetti fragili: tra ordinamento sportivo, tutele civilistiche e libertà costituzionali
2023
The paper analyzes the evolution of sporting activity for disabled people, focusing in particular on the problems concerning the performance of risky sporting activities by people with mental disabilities; these problems per- tain to the relationship between the protection of health understood as the interest of the community and the protection of health understood as the right to the pursuit of happiness, which also involve the question of the limits to the acts of disposing of one's body, and which are resolved through a continuous dialogue between the sports system and the state system.