Search results for "units"

showing 10 items of 576 documents

Coupled hydraulic and electronic regulation of cross-flow turbines in hydraulic plants

2017

The potential benefit of coupling hydraulic and electronic regulation to maximize the energy production of a cross-flow turbine in hydraulic plants is analyzed and computed with reference to a specific case. Design criteria of the cross-flow turbine inside hydraulic plants are first summarized, along with the use of hydraulic regulation in the case of constant water head and variable discharge. Optimal turbine impeller rotational speed is derived, and traditional as well as innovative systems for electrical regulation are presented. A case study is analyzed to evaluate the potential energy production according to the expected monthly mean flow distribution and two possible choices: CFT1 wit…

Engineering020209 energy0208 environmental biotechnologyFlow (psychology)Mechanical engineering02 engineering and technologyTurbineSettore ICAR/01 - IdraulicaHydraulic headImpeller0202 electrical engineering electronic engineering information engineeringMean flowWater Science and TechnologyCivil and Structural Engineeringbusiness.industryMechanical EngineeringDistributed generation unitsRotational speedCross-flow turbinesPotential energy020801 environmental engineeringElectrical drivesBanki-MichellComputational fluid dynamics (CFD) analysisbusinessEnergy (signal processing)Marine engineering
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Coupled Hydraulic and Electronic Regulation for Banki Turbines

2016

Abstract The potential benefit of coupling hydraulic and electronic regulation to maximize the energy production of a Bank turbine in hydraulic plants is analyzed and computed with reference to a specific case. Design criteria of the Banki turbine inside hydraulic plants are first summarized, along with the use of hydraulic regulation in the case of constant water head and variable discharge at the end of aqueducts feeding water distribution systems. Optimal turbine impeller rotational speed is derived and traditional, as well as innovative systems for electricity production according to controlled rotational speed of the generator are presented. The study case at the purification plant nam…

EngineeringCross-Flow turbine020209 energyMechanical engineering02 engineering and technologyelectrical drivesComputational fluid dynamicsTurbineSettore ICAR/01 - IdraulicaGenerator (circuit theory)ImpellerHydraulic headEngineering (all)0202 electrical engineering electronic engineering information engineeringCFD analysiEngineering(all)distributed generation unitsbusiness.industryRotational speedCross-Flow turbinesGeneral Medicineelectrical driveElectricity generationBanki-Michellbusinessdistributed generation unitCFD analysisEnergy (signal processing)Marine engineeringProcedia Engineering
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Pattern recognition in cyclic and discrete skills performance from inertial measurement units

2014

The aim of this study is to compare and validate an Inertial Measurement Unit (IMU) relative to an optic system, and to propose methods for pattern recognition to capture behavioural dynamics during sport performance. IMU validation was conducted by comparing the motions of the two arms of a compass, which was equipped with IMUs and reflective landmarks detected by a multi-camera system. Spearman’s rank correlation tests showed good correlations between the IMU and multi-camera system, especially when the angles were normalized. Bland-Altman plot, root mean square and the normalized pairwise variability index showed low differences between the two systems, confirming the good accuracy level…

Engineeringcoordination dynamics03 medical and health sciencesUnits of measurement0302 clinical medicine[STAT.ML]Statistics [stat]/Machine Learning [stat.ML]Inertial measurement unitCompassmovement variability ;BreaststrokeComputer visionta315Engineering(all)ComputingMilieux_MISCELLANEOUSRank correlationOrientation (computer vision)business.industryinertial measurement unitPattern recognition030229 sport sciencesGeneral MedicineClimbingPattern recognition (psychology)Artificial intelligencebusiness030217 neurology & neurosurgery
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Genome-wide promoter methylation analysis in neuroblastoma identifies prognostic methylation biomarkers.

2012

Background: Accurate outcome prediction in neuroblastoma, which is necessary to enable the optimal choice of risk-related therapy, remains a challenge. To improve neuroblastoma patient stratification, this study aimed to identify prognostic tumor DNA methylation biomarkers.Results: To identify genes silenced by promoter methylation, we first applied two independent genome-wide methylation screening methodologies to eight neuroblastoma cell lines. Specifically, we used re-expression profiling upon 5-aza-2'-deoxycytidine (DAC) treatment and massively parallel sequencing after capturing with a methyl-CpG-binding domain (MBD-seq). Putative methylation markers were selected from DAC-upregulated …

EpigenomicsMYCN Single CopyMedizinPrimary Neuroblastoma TumorBioinformaticsNeuroblastoma0302 clinical medicineRisk FactorsMYCN StatusDatabases GeneticPromoter MethylationGTP-Binding Protein alpha Subunits GsHazard Ratio PatientPromoter Regions GeneticEpigenomicsRegulation of gene expression0303 health sciencesMassive parallel sequencingHigh-Throughput Nucleotide SequencingMethylation3. Good healthGene Expression Regulation NeoplasticMedizinische Fakultät » Universitätsklinikum Essen » Zentrum für Kinder- und Jugendmedizin030220 oncology & carcinogenesisDNA methylationAzacitidineBiologieBiologyDecitabine03 medical and health sciencesneuroblastomaCell Line TumorNeuroblastomaBiomarkers TumorChromograninsmedicineHumansddc:61ddc:610Epigenetics030304 developmental biologyepigeneticsGenome HumanResearchBiology and Life SciencesbiomarkersSequence Analysis DNADNA MethylationHCT116 Cellsmedicine.diseaseSurvival AnalysisCancer researchHuman genomeDNA-methylation
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On thermoeconomics of energy systems at variable load conditions: integrated optimization of plant design and operation

2007

Abstract Thermoeconomics has been assuming a growing role among the disciplines oriented to the analysis of energy systems, its different methodologies allowing solution of problems in the fields of cost accounting, plant design optimisation and diagnostic of malfunctions. However, the thermoeconomic methodologies as such are particularly appropriate to analyse large industrial systems at steady or quasi-steady operation, but they can be hardly applied to small to medium scale units operating in unsteady conditions to cover a variable energy demand. In this paper, the fundamentals of thermoeconomics for systems operated at variable load are discussed, examining the cost formation process an…

ExergyEngineeringPrimary energyRenewable Energy Sustainability and the Environmentbusiness.industryThermoeconomics has been assuming a growing role among the disciplines oriented to the analysis of energy systems its different methodologies allowing solution of problems in the fields of cost accounting plant design optimisation and diagnostic of malfunctions. However the thermoeconomic methodologies as such are particularly appropriate to analyse large industrial systems at steady or quasisteady operation but they can be hardly applied to small to medium scale units operating in unsteady conditions to cover a variable energy demand. In this paper the fundamentals of thermoeconomics for systems operated at variable load are discussed examining the cost formation process and separately the cost fractions related to capital depreciation (which require additional distinctions with respect to plants in steady operation) and to exergy consumption. The relevant effects of the efficiency penalty due to off design operation on the exergetic cost of internal flows are also examined. An original algorithm is proposed for the integrated optimization of plant design and operation based on an analytical solution by the Lagrange multipliers method and on a multi-objective decision function expressed either in terms of net cash flow or primary energy saving. The method is suitable for application in complex energy systems such as ‘‘facilities of components of a same product’’ connected to external networks for power or heat distribution. For demonstrative purposes the proposed thermoeconomically aided optimization is performed for a grid connected trigeneration system to be installed in a large hotel.Energy Engineering and Power TechnologyCost accountingThermoeconomicsGridEnergy conservationVariable (computer science)symbols.namesakeFuel TechnologyNuclear Energy and EngineeringLagrange multipliersymbolsProcess engineeringbusinessSimulation
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Enteral feeding policies for extremely low birth weight infants. A survey in 74 Italian neonatal intensive cAre units

1999

Background: Enterai feeding for infants with birth weight1000 g (ELBWI) is still a controversial issue. The aim of the present survey was to ascertain the attitudes of Italian neonatal intensive care units (NICUs) regarding this point. Method: A questionnaire, with multiple choice answers, regarding the timing of enteral feeding, its progression, the different techniques utilised, the eventual use of fortifiers and the interrupting criteria, was mailed to 92 Italian NICUs. Results: 74 NICUs all over the country participated in the study.1153 ELBWI were hospitalised in 1996 in these Units. Enterai feeding for babies between 501 g and 750 g is started on the 1st day of life in 23.3% of the NI…

Extremely low birthweight infantsEnteral feedingHuman milkNeonatal intensive care units
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Multi-GPU Accelerated Multi-Spin Monte Carlo Simulations of the 2D Ising Model

2010

A Modern Graphics Processing unit (GPU) is able to perform massively parallel scientific computations at low cost. We extend our implementation of the checkerboard algorithm for the two-dimensional Ising model [T. Preis et al., Journal of Chemical Physics 228 (2009) 4468–4477] in order to overcome the memory limitations of a single GPU which enables us to simulate significantly larger systems. Using multi-spin coding techniques, we are able to accelerate simulations on a single GPU by factors up to 35 compared to an optimized single Central Processor Unit (CPU) core implementation which employs multi-spin coding. By combining the Compute Unified Device Architecture (CUDA) with the Message P…

FOS: Computer and information sciencesComputer scienceMonte Carlo methodGraphics processing unitFOS: Physical sciencesGeneral Physics and AstronomyMathematical Physics (math-ph)Parallel computingGPU clusterComputational Physics (physics.comp-ph)Graphics (cs.GR)Computational scienceCUDAComputer Science - GraphicsHardware and ArchitectureIsing modelCentral processing unitGeneral-purpose computing on graphics processing unitsMassively parallelPhysics - Computational PhysicsMathematical Physics
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An ensemble approach to short-term forecast of COVID-19 intensive care occupancy in Italian Regions

2020

Abstract The availability of intensive care beds during the COVID‐19 epidemic is crucial to guarantee the best possible treatment to severely affected patients. In this work we show a simple strategy for short‐term prediction of COVID‐19 intensive care unit (ICU) beds, that has proved very effective during the Italian outbreak in February to May 2020. Our approach is based on an optimal ensemble of two simple methods: a generalized linear mixed regression model, which pools information over different areas, and an area‐specific nonstationary integer autoregressive methodology. Optimal weights are estimated using a leave‐last‐out rationale. The approach has been set up and validated during t…

FOS: Computer and information sciencesStatistics and ProbabilityTime FactorsOccupancyCoronavirus disease 2019 (COVID-19)Computer science01 natural sciencesGeneralized linear mixed modelSARS‐CoV‐2law.inventionclustered data; COVID-19; generalized linear mixed model; integer autoregressive; integer autoregressive model; panel data; SARS-CoV-2; weighted ensembleMethodology (stat.ME)panel data010104 statistics & probability03 medical and health sciences0302 clinical medicinelawCOVID‐19Intensive careEconometricsHumansclustered data030212 general & internal medicine0101 mathematicsPandemicsStatistics - MethodologySARS-CoV-2Reproducibility of ResultsCOVID-19General Medicineweighted ensembleIntensive care unitResearch PapersTerm (time)integer autoregressiveIntensive Care UnitsAutoregressive modelItalyNonlinear Dynamicsgeneralized linear mixed modelinteger autoregressive modelclustered data; COVID-19; generalized linear mixed model; integer autoregressive; integer autoregressive model; panel data; SARS-CoV-2; weighted ensemble; COVID-19; Humans; Intensive Care Units; Italy; Nonlinear Dynamics; Pandemics; Reproducibility of Results; Time Factors; ForecastingStatistics Probability and UncertaintySettore SECS-S/01Settore SECS-S/01 - StatisticaPanel dataResearch PaperForecasting
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Personal protective equipment and intensive care unit healthcare worker safety in the COVID-19 era (PPE-SAFE): An international survey

2020

Purpose To survey healthcare workers (HCW) on availability and use of personal protective equipment (PPE) caring for COVID-19 patients in the intensive care unit (ICU). Materials and method A web-based survey distributed worldwide in April 2020. Results We received 2711 responses from 1797 (67%) physicians, 744 (27%) nurses, and 170 (6%) Allied HCW. For routine care, most (1557, 58%) reportedly used FFP2/N95 masks, waterproof long sleeve gowns (1623; 67%), and face shields/visors (1574; 62%). Powered Air-Purifying Respirators were used routinely and for intubation only by 184 (7%) and 254 (13%) respondents, respectively. Surgical masks were used for routine care by 289 (15%) and 47 (2%) for…

Face shieldMalebusiness.product_categoryHot TemperatureInfectious Disease TransmissionAllied Health PersonnelNursesCritical Care and Intensive Care MedicineOccupational safety and healthlaw.inventionPatient-to-Professional0302 clinical medicinelawSurveys and QuestionnairesPersonal protective equipmentHealth careMedicine and Health SciencesViralRespiratorRespiratory Protective DevicesHealth care workersHealth services researchHeadacheMasksMiddle AgedIntensive care unitEuropeIntensive Care UnitsFemaleSafetyCoronavirus InfectionsEye Protective DevicesThirstAdultmedicine.medical_specialtyCOVID-19; Health care workers; Intensive care; Personal protective equipment; Safety; Adult; Africa; Allied Health Personnel; Asia; Betacoronavirus; COVID-19; Coronavirus Infections; Europe; Eye Protective Devices; Female; Gloves Protective; Headache; Hot Temperature; Humans; Infectious Disease Transmission Patient-to-Professional; Intensive Care Units; Male; Masks; Middle Aged; North America; Nurses; Oceania; Pandemics; Personal Protective Equipment; Personnel Staffing and Scheduling; Physicians; Pneumonia Viral; Respiratory Protective Devices; SARS-CoV-2; South America; Surgical Attire; Surveys and Questionnaires; Thirst; Health Personnel; Occupational HealthInfectious Disease Transmission Patient-to-ProfessionalAsiaHealth PersonnelPneumonia ViralGlovesOceaniaPersonnel Staffing and SchedulingArticle03 medical and health sciencesBetacoronavirusIntensive carePhysiciansmedicineHumansSurgical AttirePersonal protective equipmentPandemicsOccupational Healthbusiness.industrySARS-CoV-2COVID-19030208 emergency & critical care medicinePneumoniaSouth AmericaProtective030228 respiratory systemCOVID-19Personal protective equipmentSafety Health care workersIntensive careIntensive careEmergency medicineAfricaNorth AmericabusinessGloves ProtectiveJournal of Critical Care
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Anaerobic digestion of grass silage in batch leach bed processes for methane production.

2007

Abstract Anaerobic digestion of grass silage in batch leach bed reactors, with and without a second stage upflow anaerobic sludge blanket (UASB) reactor, was evaluated. Sixty six percent of the methane potential in grass was obtained within the 55 days solids retention time in the leach bed–UASB process without pH adjustment, whereas in the one-stage leach bed process 20% of the methane potential in grass was extracted. In two-stage operation, adjustment of the pH of influent to the leach bed reactor to 6 with HCl led to inhibition of both hydrolysis/acidogenesis and methanogenesis. In the leach bed–UASB process 39% of the carbohydrates and 58% of the acid soluble lignin were solubilised wi…

FestucaAcidogenesisEnvironmental EngineeringMethanogenesisSilageIndustrial WasteBioengineeringPoaceaeLigninMethaneColony-Forming Units Assaychemistry.chemical_compoundBioreactorsBiogasLigninAnaerobiosisLeaching (agriculture)Waste Management and DisposalSilageWaste managementRenewable Energy Sustainability and the EnvironmentChemistryHydrolysisPropionibacteriumGeneral MedicineHydrogen-Ion ConcentrationPulp and paper industryAnaerobic digestionPhleumFermentationMethaneBioresource technology
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