Search results for "Dimension"

showing 10 items of 2766 documents

A Two-Dimensional Approach to Rubber V-Belt Mechanics

2010

A new two-dimensional approach to the mechanics of rubber V-belt CVT's takes into account the change, along the belt sides, of the sliding velocity on the pulley walls, together with the cross section rotation due to the shear forces. The results show significant differences with the one-dimensional thin belt model and point out the gradual increase or decrease of the belt curvature in the entrance and exit regions of the contact arc, which implies the negligibility of the belt arching in the free spans. Some experimental tests on the global variables of a rubber belt CVT indicate a very fine acceptability of the theoretical model.

Settore ING-IND/13 - Meccanica Applicata Alle MacchineV-belt two-dimensional approach
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STUDIO DI UNA FRIZIONE MAGNETOREOLOGICA PER AUTOVEICOLI

2013

Dopo un’accurata ricerca bibliografica sui fluidi magnetoreologici, il loro comportamento ed impiego, si è passati alla progettazione di una frizione magnetoreologica per autoveicoli. Considerando le caratteristiche di coppia trasmessa e potenza, il dispositivo è stato dimensionato tenendo presente i vincoli di ingombro del veicolo preso in esame. Sottoponendo il dispositivo ad analisi magnetostatica agli elementi finiti, si è determinato l’andamento delle linee di flusso del campo magnetico nel meato di fluido e nelle zone di maggior interesse, calcolando la coppia teoricamente trasmessa dall’innesto.È stato anche eseguito il confronto delle prestazionifra una frizione MR ed una frizione t…

Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineAfter a thorough literature search on magnetorheological fluids their behavior and use it has gone to the design of a magnetorheological clutch for motor vehicles. Considering the characteristics of transmitted torque and power the device is dimensioned taking into account the constraints of space of the examined vehicle. Subjecting the device to magnetostatic finite element analysis it was determined the trend of the flow lines of the magnetic field in the gap of fluid and in areas of greater interest calculating the torque transmitted theoretically by the clutch. The performance comparison between a traditional clutch and a MR clutch was also performed pointing out that the MR clutch presents shorter response times with high energy savings. The study carried out shows that the device is well suited to a vehicle with automatic or robotic or otherwise with very short response times but requires a control system for the starting the vehicle.
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On some issues in the computational modelling of spacer-filled channels for membrane distillation

2017

Abstract This study addresses issues which arise in the computational and experimental modelling of flow and heat/mass transfer in membrane distillation and other processes adopting spacer-filled channels (either planar or spiral wound), but have not been sufficiently clarified in the literature so far. Most of the argumentations presented are based on original computational results obtained by the authors by finite volume simulations; some literature results are also considered. The questions addressed regard the choice of scales for the reduction of data and the definition of dimensionless numbers ( Re , f , Nu , Sh ); the definition of average heat or mass transfer coefficients; the comb…

Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciGeneral Chemical EngineeringSettore ING-IND/25 - Impianti ChimiciThermodynamicsMembrane distillation02 engineering and technologyMembrane distillationComputational fluid dynamics; Heat transfer; Mass transfer; Membrane distillation; Spacer filled channel; Chemistry (all); Chemical Engineering (all); Materials Science (all); Water Science and Technology; Mechanical Engineeringsymbols.namesakeThermal conductivity020401 chemical engineeringComputational fluid dynamicMass transferHeat transferGeneral Materials ScienceMass transferChemical Engineering (all)0204 chemical engineeringSettore ING-IND/19 - Impianti NucleariWater Science and TechnologyFinite volume methodChemistryMechanical EngineeringChemistry (all)Reynolds numberGeneral ChemistrySpacer filled channel021001 nanoscience & nanotechnologyThermal conductionHeat transfersymbolsMaterials Science (all)0210 nano-technologyDimensionless quantityDesalination
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Progettazione di impianti fotovoltaici

2013

Settore ING-IND/33 - Sistemi Elettrici Per L'EnergiaSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciImpianto fotovoltaico criteri di progettazione e dimensionamento
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Large-Scale Available Bandwidth Measurements: Interference in Current Techniques

2011

The end-to-end available bandwidth of an Internet path is a desirable information that can be exploited to optimize system performance. Several tools have been proposed in the past to estimate it. However, existing measurement techniques were not designed for large-scale deployments. In this paper we show that current tools do not properly work where multiple probing processes share a portion of a path. We provide experimental evidence to quantify the impact of mutual interference between measurements. We further analyze the characteristics of popular tools, quantifying (i) the impact of mutual interference, (ii) the total overhead imposed to the network and (iii) the intrusiveness of the m…

Settore ING-INF/03 - TelecomunicazioniComputer Networks and Communicationsbusiness.industryComputer scienceSystem of measurementReal-time computingAvailable BandwidthProcess (computing)Interference (wave propagation)ScalabilityBandwidth (computing)Overhead (computing)The InternetElectrical and Electronic EngineeringbusinessDimensioning
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An Intelligent Car Driver for safe Navigation with Fuzzy Obstacle Avoidance.

2009

In order to respond effectively to the environment uncertainties, autonomous vehicles are generally equipped with sensors. The proposed car guidance system is equipped with an intelligent controller, based on fuzzy logic, which calculates the speed and wheels orientation in order to follow a path while it is avoiding unknown obstacles. Better fluidity of driving are obtained using future-path, car dimension and car position prevision. Vehicle symmetries also speed-up and simplify the guidance system reducing the inputs and the rules numbers.

Settore ING-INF/04 - AutomaticaComputer sciencePosition (vector)Control theoryOrientation (computer vision)Intelligent Car Driver safe Navigation Fuzzy Obstacle AvoidancePath (graph theory)Obstacle avoidanceControl engineeringDimension (data warehouse)Guidance systemFuzzy logicSimulation
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ConformalALU: A Conformal Geometric Algebra Coprocessor for Medical Image Processing

2015

Medical imaging involves important computational geometric problems, such as image segmentation and analysis, shape approximation, three-dimensional (3D) modeling, and registration of volumetric data. In the last few years, Conformal Geometric Algebra (CGA), based on five-dimensional (5D) Clifford Algebra, is emerging as a new paradigm that offers simple and universal operators for the representation and solution of complex geometric problems. However, the widespread use of CGA has been so far hindered by its high dimensionality and computational complexity. This paper proposes a simplified formulation of the conformal geometric operations (reflections, rotations, translations, and uniform …

Settore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniCoprocessorComputer scienceClifford algebraConformal geometric algebraConformal mapImage processingParallel computingImage segmentationComputational geometryTheoretical Computer ScienceGeometric algebraOperator (computer programming)Computational Theory and MathematicsConformal geometric algebra five-dimensional clifford algebra computational geometry embedded coprocessors systems-on-programmable-chip FPGA-based prototyping medical imaging segmentation 3D modeling Volume registration Growing Neural Gas marching spheres iterative closest point (ICP) thin-plate spline robust point matching (TPS-RPM)Hardware and ArchitectureScalingSoftwareIEEE Transactions on Computers
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Synthetic phenomenology and high-dimensional buffer hypothesis

2012

Synthetic phenomenology typically focuses on the analysis of simplified perceptual signals with small or reduced dimensionality. Instead, synthetic phenomenology should be analyzed in terms of perceptual signals with huge dimensionality. Effective phenomenal processes actually exploit the entire richness of the dynamic perceptual signals coming from the retina. The hypothesis of a high-dimensional buffer at the basis of the perception loop that generates the robot synthetic phenomenology is analyzed in terms of a cognitive architecture for robot vision the authors have developed over the years. Despite the obvious computational problems when dealing with high-dimensional vectors, spaces wit…

Settore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniExploitbusiness.industrymedia_common.quotation_subjectSynthetic phenomenologyCognitive architecturecognitive vision systems CiceRobotMaxima and minimaCiceRobot.Artificial IntelligencePerceptionhigh-dimensional bufferRobotComputer visioncognitive vision systemArtificial intelligenceComputational problemPsychologybusinessPhenomenology (psychology)Curse of dimensionalitymedia_common
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Investigating Perceptual Features for a Natural Human - Humanoid Robot Interaction Inside a Spontaneous Setting

2013

The present paper aims to validate our research on human-humanoid interaction (HHI) using the minimalistic humanoid robot Telenoid. We have conducted human-robot interactions test with 100 young people with no prior interaction experience with this robot. The main goal is the analysis of the two social dimension (perception and believability) useful for increasing the natural behavior between users and Telenoid. We administrated our custom questionnaire to these subjects after a well defined experimental setting (ordinary and goal-guided task). After the analysis of the questionnaires, we obtained the proof that perceptual and believability conditions are necessary social dimensions for a s…

Settore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniSocial robotmedia_common.quotation_subjectSocial dimensionTask (project management)TelenoidGeminoid Social Robot Human-Humanoid Robot InteractionHuman–computer interactionPerceptionRobotNatural (music)PsychologySimulationHumanoid robotmedia_common
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Visual Re-Ranking for Multi-Aspect Information Retrieval

2017

We present visual re-ranking, an interactive visualization technique for multi-aspect information retrieval. In multi-aspect search, the information need of the user consists of more than one aspect or query simultaneously. While visualization and interactive search user interface techniques for improving user interpretation of search results have been proposed, the current research lacks understanding on how useful these are for the user: whether they lead to quantifiable benefits in perceiving the result space and allow faster, and more precise retrieval. Our technique visualizes relevance and document density on a two-dimensional map with respect to the query phrases. Pointing to a locat…

Settore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniWeb search queryConcept searchInformation retrievalSettore INF/01 - Informaticamulti-aspect searchComputer scienceinformation retrieval information visualization multi-aspect search multi-dimensional rankingInformationSystems_INFORMATIONSTORAGEANDRETRIEVALeducation020207 software engineeringta613202 engineering and technology113 Computer and information sciencesQuery expansionmulti-dimensional rankingWeb query classification020204 information systemsHuman–computer information retrieval0202 electrical engineering electronic engineering information engineeringRelevance (information retrieval)Visual Wordinformation visualizationinformation retrievalDocument retrieval
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