Search results for "solution"

showing 10 items of 5638 documents

Performance of the first reverse electrodialysis pilot plant for power production from saline waters and concentrated brines

2016

Abstract This work reports experimental data collected for the first time on a full-scale RED pilot plant operated with natural streams in a real environment. The plant – located in the South of Italy – represents the final accomplishment of the REAPower project ( www.reapower.eu ). A RED unit equipped with almost 50 m2 of IEMs (125 cell pairs, 44x44 cm2) was tested, using both artificial and natural feed solutions, these latter corresponding to brackish water (≈0.03 M NaClequivalent) and saturated brine (4–5 M NaClequivalent). A power output up to around 40 W (i.e. 1.6 W/m2 of cell pair) was reached using natural solutions, while an increase of 60% was observed when testing the system with…

Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciEngineeringBrineFiltration and Separation02 engineering and technologySTREAMS010501 environmental sciences01 natural sciencesBiochemistryReversed electrodialysisOsmotic powerSalinity gradient powerGeneral Materials SciencePower outputPhysical and Theoretical Chemistry0105 earth and related environmental sciencesBrackish waterFoulingbusiness.industryREAPowerBrackish waterEnvironmental engineering021001 nanoscience & nanotechnologyBrackish water; Brine; Natural solutions; REAPower; Salinity gradient power; Physical and Theoretical Chemistry; Materials Science (all); Biochemistry; Filtration and SeparationBrinePilot plantMaterials Science (all)0210 nano-technologybusinessNatural solution
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Reverse electrodialysis: Applications

2016

Reverse electrodialysis (RED) technology has grown significantly in the last decade, gaining a fast increase in its technology readiness level and presenting some interesting examples of RED pilot systems operating under very different real environments. In this chapter, an overview of technological developments and piloting examples are reported. In particular, a short introduction is given on the historical trend of RED technology growth, followed by a careful analysis of which feed solutions can be adopted and how these can affect the process performance, potentials, and applications. Most prominent fluid dynamics aspects for the RED process are presented, highlighting how these can infl…

Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciSettore ING-IND/24 - Principi Di Ingegneria ChimicaLayoutSettore ING-IND/25 - Impianti ChimiciPilot systemFeed solutionREDFluid dynamic
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Experimental investigation and modelling for sulphuric acid recovery by diffusion dialysis

2018

Sulphuric acid is known to be one of the key inorganic acid and has been widely used in chemical reaction and metal industries for surface treatments as in the copper electroplating process. During these processes, large amounts of waste sulphuric acid solution are generally generated, containing high concentrations of metals and acid. The possibility of recover and reuse the sulphuric acid in the process could avoid environmental contamination and reduce costs of the disposal. Among several separation methods, diffusion dialysis (DD) is becoming more and more attractive thanks to the recent important advances in ion exchange membranes (IEMs) field and because of its clean nature and operat…

Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciSulphuric acid recoverycopper electroplating solutions diffusion dialysis
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An Improved Solver for the M/EEG Forward Problem

2014

Noninvasive investigation of the brain activity via electroencephalography (EEG) and magnetoencephalography (MEG) involves a typical inverse problem whose solution process requires an accurate and fast forward solver. We propose the Method of Fundamental Solutions (MFS) as a truly meshfree alternative to the Boundary Element Method (BEM) for solving the M/EEG forward problem. The solution of the forward problem is obtained, via the Method of Particular Solutions (MPS), by numerically solving a set of coupled boundary value problems for the 3D Laplace equation. Numerical accuracy and computational load are investigated for spherical geometries and comparisons with a state-of-the-art BEM solv…

Settore ING-IND/31 - ElettrotecnicaSettore MAT/08 - Analisi NumericaEEG MEG method of fundamental solutions meshfree methods
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Bio-electromagnetic Numerical Modeling for Health Diagnostics

Settore ING-IND/31 - ElettrotecnicaSettore MAT/08 - Analisi Numericabioelectromagnetic fields bioelectromagnetism numerical methods medical imaging neuroimaging brain activity electroencephalography magnetoencephalography EEG MEG meshfree meshless method of fundamental solutionscampi bioelettromagnetici bioelettromagnetismo metodi numerici diagnostica per immagini attività cerebrale elettroencefalografia magnetoencefalografia metodo delle soluzioni fondamentali
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Rateless Codes Performance Analysis in Correlated Channel Model for GEO Free Space Optics Downlinks

2012

Settore ING-INF/03 - TelecomunicazioniFree Space Optics (FSO) technologies for satellite communications offer several advantages: wide bandwidth high rate capability immunity to electromagnetic interference and small equipment size. Thus they are suitable for inter-satellite links deep space communications and also for high data rate ground-to-satellite/satellite-to-ground communications. Nevertheless FSO links suffer impairments that cause power signal degradation at the receiver. Scattering and absorption cause power signal attenuations predictable by suitable deterministic models. Optical turbulence causes random irradiance fluctuations which can generate signal fading events and can thereby only be predicted by statistical models. Attenuation and fading events can corrupt FSO links and so it would be recommended to add mitigation error codes on the communication link. FSO channel can be described as an erasure channel: fading events can cause erasure errors. We have identified in rateless codes (RCs) a suitable solution to be employed in FSO links. RCs do not need feedback and they add a redundant coding on the source data that allows the receiver to recover the whole payload despite erasure errors. We implemented two different of rateless codes: Luby Transform (LT) and Raptor. We analyzed their performances on a simulated turbulent GEO FSO downlink (1 Gbps - OOK modulation) at a 106 μm wavelength and for different values of zenith angles. Assuming a plane-wave propagation and employing Hufnagel-Valley we modeled the downlink using: 1) a temporal correlated channel model based on Gamma-Gamma probability distribution and 2) an irradiance covariance function that we converted on a time function using Taylor frozen eddies hypothesis. Our new channel model is able to simulate irradiance fluctuations at different turbulence conditions as it will be shown in the full paper. We will also report performance results of LT and Raptor codes at overhead range varying between 0 and 50% and for different values of source packets.Settore ING-INF/01 - Elettronica
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Prnu Pattern Alignment for Images and Videos Based on Scene Content

2019

This paper proposes a novel approach for registering the PRNU pattern between different camera acquisition modes by relying on the imaged scene content. First, images are aligned by establishing correspondences between local descriptors: The result can then optionally be refined by maximizing the PRNU correlation. Comparative evaluations show that this approach outperforms those based on brute-force and particle swarm optimization in terms of reliability, accuracy and speed. The proposed scene-based approach for PRNU pattern alignment is suitable for video source identification in multimedia forensics applications.

Settore ING-INF/05 - Sistemi Di Elaborazione Delle Informazioni021110 strategic defence & security studiesSettore INF/01 - Informaticabusiness.industryComputer scienceComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION0211 other engineering and technologiesPRNU SIFT image registration video stabilizationParticle swarm optimization02 engineering and technologyVideos Particle swarm optimization Image resolution Correlation Reliability Cameras SensorsIdentification (information)Content (measure theory)0202 electrical engineering electronic engineering information engineering020201 artificial intelligence & image processingComputer visionArtificial intelligencebusinessReliability (statistics)
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Super-resolution-based magnification of endothelium cells from biomicroscope videos of the cornea

2018

We present a practical, robust, and effective pipeline to compute a high-resolution (HR) image of the corneal endothelium starting from a low-resolution (LR) video sequence obtained with a general purpose slit lamp biomicroscope. An image quality typical of dedicated and more expensive confocal microscopes is achieved via software magnification by exploiting information redundancy in the video sequence. In particular, the HR image is generated from the best LR frames, obtained by identifying the most suitable endothelium video subsequence using a support vector machine-based learning approach, followed by a robust graph-based frame registration. Results on long, real sequences show that the…

Settore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniImage fusionSettore INF/01 - InformaticaImage qualityComputer sciencebusiness.industryFrame (networking)ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONImage registrationMagnificationsuper-resolutionImage segmentationAtomic and Molecular Physics and Opticsslit lamp biomicroscope image enhancementComputer Science ApplicationsSupport vector machinecorneal endotheliumSoftwaremachine learningComputer visionimage mosaicingArtificial intelligenceElectrical and Electronic Engineeringbusiness
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Design and Implementation of an Efficient Fingerprint Features Extractor

2014

Biometric recognition systems are rapidly evolving technologies and their use in embedded devices for accessing and managing data and resources is a very challenging issue. Usually, they are composed of three main modules: Acquisition, Features Extraction and Matching. In this paper the hardware design and implementation of an efficient fingerprint features extractor for embedded devices is described. The proposed architecture, designed for different acquisition sensors, is composed of four blocks: Image Pre-processor, Macro-Features Extractor, Micro- Features Extractor and Master Controller. The Image Pre- processor block increases the quality level of the input raw image and performs an a…

Settore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniMinutiaeBiometricsComputer sciencebusiness.industryFingerprint (computing)Feature extractionFingerprint recognitionComputer visionArtificial intelligenceFPGA Fingerprint Features Extraction Adaptive ProcessingField-programmable gate arraybusinessImage resolutionBlock (data storage)2014 17th Euromicro Conference on Digital System Design
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Real-time content-aware image resizing using reduced linear model

2010

In this paper an effective and efficient method for contentaware image resizing is proposed. It is based on the solution of a linear system where each pixel displacement (compression or expansion) is determined in dependence of the visual relevance of the pixel itself. The linear nature of the model allows real-time application of the method even for large images. This fully automatic approach can be also improved by interactively providing cues such as geometric constraints and/or manual relevant object labeling. The results have proven that the presented method achieves results comparable or superior to existent strategies, while improving efficiency.

Settore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniPixelImage resizing Image retargeting linear optimization visual saliencyPhysics::Instrumentation and Detectorsbusiness.industryComputer scienceComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONLinear modelIterative reconstructionDisplacement (vector)Computer Science::GraphicsSeam carvingComputer Science::Computer Vision and Pattern RecognitionComputer Science::MultimediaComputer visionArtificial intelligencebusinessImage resolutionComputingMethodologies_COMPUTERGRAPHICS2010 IEEE International Conference on Image Processing
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