Search results for "Springs"

showing 10 items of 19 documents

Utilization of limnocrenic karst springs in south-western Poland in balneotherapy and spa healthcare

2015

Polska należy do krajów bogatych w wodę i ten zasób może być z powodzeniem stosowany w celach leczniczych, jak również w przemyśle spożywczym, chemicznym i grzewczym. Do obszarów o dużym znaczeniu perspektywicznym posiada, m.in. Śląsk Opolski w południowo-zachodniej Polsce, należący częściowo do prowincji Sudetów, która biegnie wzdłuż południowych granic Polski, Czech i Niemiec. Do tej pory obszar ten był znany z wysoko zmineralizowanych kwaśnych wód termalnych z Grabina koło Grodkowa, które są planowane do wykorzystania dla celów leczniczych w lecznictwie uzdrowiskowym. Podczas badań hydrologicznych prowadzonych na Śląsku Opolskim w latach 2010–2015, stwierdzono obecność nieznanych, średni…

limnokrenowe źródła krasowelimnocrenic karst springsbalneoterapialecznictwo uzdrowiskowebalneotherapypołudniowo-zachodnia Polskaspa healthcareSW PolandComplementary and Alternative Medicine in Science
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Multiple origins of methane in fluids circulating in the Othrys ophiolite, central Greece

2018

The complex geology of Greece includes two important parallel running ophiolitic belts. The Othrys Massif in central Greece belongs to westernmost of them. In and around this wide ophiolite outcrop, some cold hyperalkaline and some hypothermal (T < 40°C) alkaline springs are present. Thirty water samples were collected at 17 different sites and both bubbling and dissolved gases were analysed for their chemical (He, Ne, H2, O2, N2, CH4, C2H6, CO2 and H2S) and isotope (He, δ13C-CO2, δ 13C-CH4, δ 2H-CH4) composition. All samples except one have H2S contents below detection limit (10 μmol/mol), whilst H2 (from <2 to 2500 μmol/mol), CO2 (up to 26,000 but generally below 1000 μmol/mol) and …

continental serpentinization hyperalkaline springs bubbling and dissolved gasesSettore GEO/08 - Geochimica E Vulcanologia
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Static output-feedback controller design for vehicle suspensions: an effective two-step computational approach

2014

In this study, a novel two-step methodology is applied in designing static output-feedback controllers for a class of vehicle suspension systems. Following this approach, an effective synthesis of static output-feedback controllers can be carried out by solving two consecutive linear matrix inequality optimisation problems. To illustrate the main features of the proposed design strategy, two different static output-feedback H 8 controllers are designed for a quarter-car suspension system. The first of those controllers uses the suspension deflection and the sprung mass velocity as feedback information, whereas the second one only requires the sprung mass velocity to compute the control acti…

Output feedbackEngineeringFrequency responseControl and Optimization:Informàtica::Automàtica i control [Àrees temàtiques de la UPC]Linear matrix inequalitiesVehicle suspensionsDesign strategyControl and Systems Engineering; Human-Computer Interaction; Computer Science Applications1707 Computer Vision and Pattern Recognition; Control and Optimization; Electrical and Electronic EngineeringFeedback control systemsMatrius (Matemàtica)Vehicles -- Ressorts i suspensió:93 Systems Theory; Control [Classificació AMS]Control theoryDeflection (engineering)ControlElectrical and Electronic EngineeringMatrix inequalitiesSuspension (vehicle)Controller design:93 Systems Theory [Classificació AMS]Vehicles--Springs and suspensionbusiness.industryLinear matrix inequality:Matemàtiques i estadística [Àrees temàtiques de la UPC]Control engineeringComputer Science Applications1707 Computer Vision and Pattern RecognitionVehicles -- Springs and suspensionComputer Science ApplicationsHuman-Computer InteractionControl and Systems EngineeringSistemes de control per retroaccióSprung massbusinessStatic output-feedback control
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Evolutionary Conflict Between Maternal and Paternal Interests: Integration with Evolutionary Endocrinology

2016

International audience; Conflict between mates, as well as conflict between parents and offspring are due to divergent evolutionary interests of the interacting individuals. Hormone systems provide genetically based proximate mechanisms for mediating phenotypic adaptation and maladaptation characteristic of evolutionary conflict between individuals. Testosterone (T) is among the most commonly studied hormones in evolutionary biology, and as such, its role in shaping sexually dimorphic behaviors and physiology is relatively well understood, but its role in evolutionary conflict is not as clear. In this review, we outline the genomic conflicts arising within the family unit, and incorporate m…

Male0106 biological sciences0301 basic medicinemedicine.medical_specialtymaternal interestsOffspringMyodes glareolusPlant Science010603 evolutionary biology01 natural sciences03 medical and health sciencesoffspringsSex Hormone-Binding GlobulinInternal medicinemedicineAnimalsTestosteroneLife History TraitsMaladaptation[SDV.EE]Life Sciences [q-bio]/Ecology environmentFamily unitbiologyArvicolinae[SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE]paternal interestsbiology.organism_classificationBiological EvolutionBank voleSexual dimorphismevolutionary endocrinology030104 developmental biologyEndocrinologyparent-offspring conflictsta1181FemaleAnimal Science and ZoologyGenetic FitnessAdaptationIntegrative and Comparative Biology
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Effect of temperature on the orthodontic clinical applications of NiTi closed-coil springs

2013

NiTi spring coils were used to obtain large deformation under a constant force. The device consists on a NiTi coil spring, superelastic at body temperature, in order to have a stress plateau during the austenitic retransformation during the unloading. The temperature variations induced changes in the spring force. Objectives: The aim of this study is to investigate the effect of the temperature variations in the spring forces and corrosion behaviour simulating the ingestion hot/cold drinks and food. Study D esign: The springs were subjected to a tensile force using universal testing machine MTS-Adamel (100 N load cell). All tests were performed in artificial saliva maintained at different t…

Materials scienceElasticidadOrtodòncia616.3OdontologíaOrthodontics:Enginyeria dels materials [Àrees temàtiques de la UPC]Load cellNiTiCorrosionPhysical PhenomenaStress (mechanics)RecoveryMaterials TestingBiomaterials and Bioengineering in DentistryOrthodontic WiresOrthodonticComposite materialSuperelasticitySalivaGeneral DentistryUniversal testing machineElasticitatTemperatureNíquel-titani -- AliatgesCoilsTemperatura:CIENCIAS MÉDICAS [UNESCO]Coil springCiencias de la saludElasticityOrtodonciaNickel-titanium alloysSpringsOtorhinolaryngologySpring (device)Nickel titaniumPseudoelasticityUNESCO::CIENCIAS MÉDICASResearch-ArticleSurgery
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Evaluation of the power quality from a seawave power farm for different interconnection schemes

2007

In this paper we present an approach to the interconnection of a seawave power farm to the grid The generator type used in the farm is a Permanent Magnet (PM) linear generator driven from the seawaves that generates, therefore, highly distorted emfs. We propose and compare two possible ways to interconnect the farm to the grid. One is based on an approach where for each generator there is a conversion subsystem that permits the direct connection of each generator to the a.c. network, the other one is based on an ac.-d.c. converter that is connected to the generator, the converter is connected to a dc link that can receive the power from every unit and that can supply a dc-ac converter direc…

InterconnectionEngineeringGenerator (computer programming)business.industryElectrical engineeringSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciGridPower (physics)Power quality Power generation DC generators Distributed power generation Stator windings Mesh generation Permanent magnets Stochastic processes Frequency SpringsElectricity generationMesh generationLinear congruential generatorElectronic engineeringbusinessSynchronous motor
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Coseismic geochemical variations in some gas emissions of Umbria region (Central Italy)

2000

Abstract Coseismic geochemical variations have been detected in some gaseous vents and natural springs during the last seismic crisis occurred in Umbria region (Central Apennines), that started on September 26th, 1997 with several moderate earthquakes (up to M1 5.8). The results of chemical analyses performed on both gas and water samples taken at a weekly rate, combined with analyses on continuous gas flow rate nearby San Faustino site, suggest that the variations can be interpreted as possible consequence of the crustal permeability changes induced by earthquake shaking.

Permeability (earth sciences)General Earth and Planetary SciencesNatural SpringsGas emissionsGeomorphologyGeologyPhysics and Chemistry of the Earth, Part A: Solid Earth and Geodesy
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Interannual memory effects for spring NDVI in semi-arid South Africa

2008

[1] Almost 20 years of Normalized Difference Vegetative Index (NDVI) and precipitation (PPT) data are analysed to better understand the interannual memory effects on vegetation dynamics observed at regional scales in Southern Africa (SA). The study focuses on a semi-arid region (25°S–31°S; 21°E–26°E) during the austral early summer (September–December). The memory effects are examined using simple statistical approaches (linear correlations and regressions) which require the definition of an early summer vegetation predictand (December NDVI minus September NDVI) and a consistent set of potential predictors (rainfall amount, number of rainy days, rainfall intensity, NDVI and Rain-Use-Efficie…

0106 biological sciences[ SDU.OCEAN ] Sciences of the Universe [physics]/Ocean Atmosphere010504 meteorology & atmospheric sciencesPluieSummerrainfallspringsLand cover010603 evolutionary biology01 natural sciencesNormalized Difference Vegetation IndexVegetation dynamicsSouth AfricaOccupation solland covervegetationSpring (hydrology)Regional scopePrecipitation0105 earth and related environmental sciencesEfficacitéRégressiongeographygeography.geographical_feature_categorySpring seasonVegetationVégétation15. Life on landVegetation dynamicsAridatmospheric precipitationCorrélationPrédicteurIntensitéGeophysicsefficiency13. Climate actioncorrelationEtéClimatologyAfricaGeneral Earth and Planetary SciencesEnvironmental scienceregressionSemi arid zoneSpring(season)intensitySouthern AfricaPredictor
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Thermomineral waters of Greece: geochemical characterization

2020

75 °C). In terms of pH most results vary from 5.5 to 823 °C) ii) warm (23 40 °C) iii) thermal (40 75 °C) and iv) hyperthermal (&gtfew springs show either very low pH (&lt10) proposing serpentinization processes. Regarding TDS concentrations collected waters can be subdivided into low salinity (up to 1.5 g/L) brackish (up to 20 g/L) and saline (up to 43 g/L). The medium high salinities can be justified by mixing with sea water and/or strong waterrock interaction processes. Isotope composition of O and H ranges from 12.7 to +2.7 ‰ SMOW and from 91 to +12 ‰ SMOW respectively and is generally comprised between the Global Meteoric Water Line and the East Mediterranean Meteoric Water Line. Only few water samples show a positive shift for δ18O possibly related to high temperature waterrock interaction processes. Carbon dioxide (18 997000 μmol/mol) or N2 (1100 989000 μmol/mol) or CH4 (&ltMany geothermal areas of Greece are located in regions affected by Miocene or Quaternary volcanism and in continental basins characterised by elevated heat flow. Moreover the majority of them is found along the coast as well as in islands of the Aegean Sea and thus thermal water is often brackish to saline due to marine intrusion into costal aquifer. In the present study almost 300 thermal and cold mineral water samples were collected along the Hellenic territory with their physicochemical parameters (temperature pH electrical conductivity and Eh) and the amount of bicarbonates (titration with 0.1N HCl) being determined in situ. Additionally gases found either in free or dissolved phase were sampled. Both water and gas samples were analysed at the INGVPa laboratories for major ions (Ion Chromatography) silica (Inductively Coupled Plasma Optical Emission Spectrometry) chemical composition of free and dissolved gases (Gas Chromatography) water isotopes (O and H) and carbon and helium isotopes of free and dissolved gases (Mass Spectrometry). The temperature of the investigated waters ranges from 6.5 to 98°C pH from 1.96 to 11.98 whilst Total Dissolved Solids (TDS) from 0.06 to 43 g/L. Based on the temperature parameter waters can be divided into four groups: i) cold (&lt0.5 913000 μmol/mol) are the prevailing gas species found in the studied sites. The δ13CCO2 values ranged from 20.1 to +8.5 ‰ whilst the isotope ratio of He from 0.21 to 6.71 R/RA.4) suggesting interaction with H2Srich gases or very high pH values (&gtSettore GEO/08 - Geochimica E Vulcanologia
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Critical Exploration of Flexible Delivery

2020

This work-in-progress research article presents an introductory qualitative study on students' perceptions of a flexibly delivered, modular computer science course. Many contemporary approaches to education rely in various ways on flexible delivery of course content. This is often done to capitalize on modern technology and the web, and to put the student ‘in the center.' However, it is becoming manifest that these approaches may challenge both the students and the equity between them, making it important to understand the effects of flexible delivery in terms of the students. In the voice of our students, flexible delivery was seen as a largely positive approach, reducing stress, promoting…

oppimisympäristöComputer sciencevideossprings02 engineering and technologystressjoustavuustechnological innovation020204 information systemsComputingMilieux_COMPUTERSANDEDUCATION0202 electrical engineering electronic engineering information engineeringkurssiteducationopiskelijatbusiness.industryLearning environment05 social sciencesPerspective (graphical)Equity (finance)050301 educationFlexibility (personality)stressioppimisalustatModular designtoolsopiskelutask analysisTask analysisEngineering ethicsbusiness0503 educationQualitative research2020 IEEE Frontiers in Education Conference (FIE)
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