1,390 research outputs found
Computational Analysis of the Effects of Fiber Deformation on the Microstructure and Permeability of Blood Oxygenator Bundles
No full textMechanical loads on the polymeric fibers of oxygenating bundles are commonly present due to bundle press-fitting during device assembly and blood pressure load. However, computational fluid dynamics (CFD) simulations for fiber bundle optimization neglect possible changes in microstructure due to such deformations. The aim of this study is to investigate the impact of fiber deformability on bundle microstructure and fluid dynamics mainly in terms of permeability. Fibers from commercial mats typically used for blood oxygenators were mechanically tested and based on these experimental data, a material model was developed to simulate the structural deformations the fibers undergo under press-fitting and blood pressure loads. Then, CFD simulations were performed on deformed bundle repetitive units to investigate permeability under varying loading conditions. The effects of different bundle geometric parameters on the variation of bundle permeability due to press-fitting were evaluated. Bundle press-fitting results in significant changes in microstructure that are reflected in a bundle permeability more than halved for a 15% press-fitting. This impact on permeability is present in all the simulated fiber bundles and becomes more pronounced as the pitch between fibers and thus bundle porosity decreases. Instead, the analyses on pressurized bundle show only small deformations caused by pressure load, with permeability changes below 1%. While blood pressure effects could be neglected, bundle press-fitting turns out to have a significant impact on bundle microstructure and permeability. Neglecting such microstructure variations during CFD simulations could also lead to incorrect assessment of the local fluid dynamics within the bundle
Rigenerazione bioclimatica ed ambientale degli spazi aperti del Villaggio San Luca (MS)
No full textSe la rigenerazione urbana si pone tra i suoi obiettivi l’applicazione di principi progettuali al fine di perseguire una più ampia idea di sostenibilità, la rigenerazione in chiave bioclimatica si spinge ad affrontare il tema del recupero, valorizzando le condizioni ambientali, climatiche e naturali del sito e massimizzando le potenzialità dei sistemi passivi già presenti nel contesto antropizzato. L’obiettivo strategico di mettere a sistema la lettura morfologica del tessuto urbano esistente, con le necessità di controllo microclimatico viene qui applicata agli spazi aperti del Villaggio San Luca, parte del Piano P.E.E.P. per il quartiere Bonascola di Carrara (Piccinato, 1965-1966), che diventa occasione per testare un approccio integrato di rigenerazione bioclimatica – ambientale, sulla scia di esempi internazionali comparabili, per dimensioni e caratteristiche degli spazi aperti, al caso italiano.
Attraverso le valutazione microclimatiche condotte tramite il software ENVI-met sugli spazi aperti del quartiere, questo contributo presenta una possibile modalità di analisi sull’efficacia ambientale di alcune scelte progettuali, ricorrendo alle analisi di comfort termoigrometrico, ai flussi del vento, alle scelte dei materiali di finitura e delle loro caratteristiche radiative, per giungere infine a quantificare i vantaggi ambientali di scenari di mitigazione anche sul comfort individuale percepito dagli utenti. In tal modo si identificano quantitativamente alcuni elementi di criticità degli spazi aperti non edificati, delle aree aperte, degli spazi di transizione e di fruizione collettiva, individuando zone e situazioni che possano essere ripensate, sfruttando i principi compositivi e bioclimatici sottesi al progetto originale di Luigi Piccinato
Numerical evaluation of environmental performance of a renaissance building to address a comprehensive retrofit strategy: the case of Palazzo Tassoni Estense in Ferrara (Italy)
No full textEnergy retrofit of historic heritage has become a priority of Member States in order to reach new level of sustain- ability. Strategies to enhance the energy performance of historic building (HB), however, mainly aim at improving indoor comfort and reduce their energy consumption. The scale of interaction among the indoor climate, building envelope’s and outside microclimate is still disregarded, although their relationship is very important to i) improve the indoor comfort levels; ii) enhance the outdoor frui- tion quality (i.e. in museum where the outside perceived temperature and relative humidity may affect the tourist’s appreciation); iii) to control the heat urban island effect. Hence, awareness about both indoor and outdoor per- formances is relevant to address effective strategies to improve natural ventilations, absorption of heat wave, shading, to select finishing materials or add natural ele- ments (water and vegetation). HB present often a court- yard or porches, which play a strategic role to control the outdoor microclimate. Many authors have studied their performance in hot and arid climate (i.e. Islamic hous- es) but deepening the knowledge on their contribution in warm humid climates and in other architectural typologies is still required. Using ENVI-met® simulations the paper presents a numerical environmental analysis to address design solutions for Palazzo Tassoni Estense in Ferrara (Italy), an example of renaissance typology widely spread in the European area
Correction to: When terminology hinders research: the colloquialisms of transitions of control in automated driving (Cognition, Technology & Work, (2022), 10.1007/s10111-022-00705-3)
No full textIn the original article, author affiliation published with error. The correct affiliations are: Davide Maggi—Institute for Transport Studies, Leeds, UK. Richard Romano—Institute for Transport Studies, Leeds, UK. Oliver Carsten—Institute for Transport Studies, Leeds, UK. Joost C. F. De Winter—Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Delft, The Netherlands. The original article has been corrected.Human-Robot Interactio
DSL evolution through composition
No full textThe use of domain specific languages (DSL), instead of general purpose languages introduces a number of advantages in software development even if could be problematic to maintain the DSL consistent with the evolution of the domain. Traditionally, to develop a compiler/interpreter from scratch but also to modify an existing compiler to support the novel DSL is a long and difficult task. We have developed Neverlang to simplify and speed up the development and maintenance of DSLs. The framework presented in this article not only allows to develop the syntax and the semantic of a new language from scratch but it is particularly focused on the reusability of the language definition. The interpreters/compilers produced with such a framework are modular and it is easy to add remove or modify their sections. This allows to modify the DSL definition in order to follow the evolution of the underneath domain. In this work, we explore the Neverlang framework and try out the adaptability of its language definition
Admiel Kosman, Siamo giunti a Dio
No full textInternational audienceSix poems from Israeli poet Admiel Kosman translated from the Hebrew into Italian. Selection of poems, presentation of the author, translation and notes by Davide Mano
Admiel Kosman, Siamo giunti a Dio
No full textInternational audienceSix poems from Israeli poet Admiel Kosman translated from the Hebrew into Italian. Selection of poems, presentation of the author, translation and notes by Davide Mano
Communication-aware allocation and scheduling framework for stream-oriented multi-processor systems-on-chip
No full textThis paper proposes a complete allocation and scheduling framework, where an MPSoC virtual platform is used to accurately derive input parameters, validate abstract models of system components and assess constraint satisfaction and objective function optimization. The optimizer implements an efficient and exact approach to allocation and scheduling based on problem decomposition. The allocation subproblem is solved through Integer Programming while the scheduling one through Constraint Programming. The two solvers can interact by means of no-good generation, thus building an iterative procedure which has been proven to converge to the optimal solution. Experimental results show significant speedups w.r.t. pure IP and CP exact solution strategies as well as high accuracy with respect to cycle accurate functional simulation. A case study further demostrates the practical viability of our framework for real-life systems and applications
Mild adverse childhood experiences increase neural efficacy during affective theory of mind
No full textAdverse childhood experiences (ACEs) affect the development of social cognition (and identify a risk factor for several physical and mental disorders). Theory of Mind (ToM) is a key predictor of social functioning, mental health, and quality of life. No previous study explored the effect of mild ACEs on the neural correlates of ToM in healthy humans. In 23 healthy participants, we used brain blood oxygen level-dependent fMRI to study the effect of ACEs on the neural responses to tasks targeting affective and cognitive ToM. Results pointed out an association between ACEs and a lower neural response in the vermis of the cerebellum (râ=ââ.85), precentral gyrus, and inferior frontal operculum (putative Mirror Neural System, râ=ââ.78) during affective ToM. A lower recruitment of these brain regions, paralleled by the same performance, could express an increased neural efficacy in inferring affective mental states driven by previous experience, in this case, ACEs
Scalability Analysis of Evolving SoC Interconnect Protocols
No full textTo face evolving communication requirements in Systemon-
Chip (SoC) designs, interconnect fabric capabilities can
be improved by adopting new topologies or new protocols.
This paper will focus on the latter approach, analyzing the
scalability features under increasing system load of shared
bus STBus and AMBA AXI interconnects as opposed to the
widely deployed AMBA AHB architecture
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