Search results for "Measurements"

showing 10 items of 720 documents

Quantification of Lung Volume at Different Tidal Volumes and Positive End-Expiratory Pressures in a Porcine Model by Using Retrospective Respiratory …

2008

PURPOSE: This feasibility study in healthy animals should prove the concept that it is possible to quantitatively assess the effects of different ventilatory settings on the lung parenchyma during ongoing ventilation in respiratory gated 4-dimensional (D)-computed tomography (CT). For this purpose, the influence of different tidal volumes and positive end-expiratory pressure (PEEP) on quantitative assessment of lung volumes (LVs) and lung compartments was analyzed. METHODS: Five anesthetized and ventilated (20 breaths/min, inspiratory/expiratory ratio of 1:2) healthy pigs underwent 16-row multidetector CT with retrospective respiratory gating using a noncontact charge-coupled device camera …

SwineAtelectasisLung injuryPositive-Pressure RespirationImage Processing Computer-AssistedTidal VolumemedicineAnimalsRadiology Nuclear Medicine and imagingLung volumesExpirationRespiratory systemLungTidal volumeLungbusiness.industryGeneral Medicinerespiratory systemmedicine.diseaserespiratory tract diseasesmedicine.anatomical_structureAnesthesiaBreathingFeasibility StudiesLung Volume MeasurementsTomography X-Ray ComputedNuclear medicinebusinessInvestigative Radiology
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Aircraft type-specific errors in AMDAR weather reports from commercial aircraft

2008

AMDAR (Aircraft Meteorological DAta Relay) automated weather reports from commercial aircraft provide an increasing amount of input data for numerical weather prediction models. Previous studies have investigated the quality of AMDAR data. Few of these studies, however, have revealed indications of systematic errors dependent upon the aircraft type. Since different airlines use different algorithms to generate AMDAR reports, it has remained unclear whether a dependency on the aircraft type is caused by physical properties of the aircraft or by different data processing algorithms. In the present study, a special AMDAR dataset was used to investigate the physical type-dependent errors of AMD…

Systematic errorAtmospheric ScienceData processingMeteorologybusiness.industryAircraft meteorological data relayType specificNumerical weather prediction modelsContrast (statistics)Temperature biasTemperature measurementSoftwareAircraft Meteorological Data RelayEnvironmental sciencebusinessAircraft measurementsUpper air data
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Evaluation of the MOD16A2 evapotranspiration product in an agricultural area of Argentina, the Pampas region

2021

The Pampas Region is a big plain of approximately 520,000 km2 in Argentina. It is essential to estimate evapotranspiration (ET) in this region since the primary productivity is directly linked to water availability. Information provided by satellite missions allows monitoring the spatial and temporal variability of ET. In the current study, we evaluated the version 006 of MOD16A2 product (MOD16A2.006) of Potential Evapotranspiration (ETp) and Actual Evapotranspiration (ETa) in Argentinian Pampas Region (APR). MOD16A2.006 product was compared with Crop Evapotranspiration (ETc), calculated with local measurements from the Oficina de Riesgo Agropecuario (ORA), and Crop Coefficient (Kc) data (f…

Systematic errorTeledeteccióHidrologia0211 other engineering and technologiesMOD16A2 VERSION 602 engineering and technology010502 geochemistry & geophysicsAtmospheric sciences01 natural sciencesNormalized Difference Vegetation IndexREMOTE SENSING//purl.org/becyt/ford/1 [https]//purl.org/becyt/ford/1.5 [https]Crop evapotranspirationEvapotranspirationSoybean cropPrimary productivity021101 geological & geomatics engineering0105 earth and related environmental sciencesbusiness.industryGROUND MEASUREMENTSPOTENTIAL EVAPOTRANSPIRATIONCrop coefficientAiguaACTUAL EVAPOTRANSPIRATIONAgricultureGeneral Earth and Planetary SciencesEnvironmental sciencebusiness
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Nitrous oxide fluxes from permafrost regions

2020

This dataset is a synthesis of published nitrous oxide (N2O) fluxes from permafrost-affected soils in Arctic, Antarctic, and Alpine permafrost regions. The data includes mean N2O flux rates measured under field (in situ) conditions and in intact plant-soil systems (mesocosms) under near-field conditions. The dataset further includes explanatory environmental parameters such as meteorological data, soil physical-chemical properties, as well as site and experimental information. Data has been synthesized from published studies (see 'Further details'), and in some cases the authors of published studies have been contacted for additional site-level information. The dataset includes studies publ…

Temperature airNumber of pointsHemeroby/disturbanceannual meanNumber of measurement seasonsTemperature soilDensityArea localityPrecipitationgravimetricmeanNitrateTime in minutesAnalytical methodType of studyReference of dataTemperature air annual meanArea/localitypH soilCarbon Nitrogen ratioYear of observationWater holding capacityOriginal unitSample code/labelReplicatesNitrous oxidepHPermafrost extentThaw depth of active layer meanTemperatureMonthSample code labelZoneWater filled pore space calculatedExperimental treatmentCountryPrecipitation annual meanOrganic carbon soilEarth System ResearchSoil water content gravimetricType of chamberAmmoniumPresence/absenceNitrogenairvolumetricLocationactive layerType of disturbanceSiteVegetation typeWater filled pore spaceSoil water content volumetricSoil water contentin mass nitrous oxidesoilThaw depth of active layercalculatedbulkmaximumLONGITUDEOrganic carbonEcosystemPublication of dataPresence absenceSoil organic matterEvent labelThaw depth of active layer maximumNumber of measurementsHemeroby disturbanceNitrous oxide flux in mass nitrous oxideCarbon/Nitrogen ratiofluxOriginal valueLATITUDEDayNitrogen soilSoil moistureDensity active layer bulk
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Mesures de la température et spatialisation de l’Ilot de Chaleur Urbain à Dijon

2015

The Territorial Climate Energy Plan (PCET) of the agglomeration of Dijon (Grand Dijon) includes ameasurement campaign (6 June to 28 September 2014). 50 Hobo proV2 thermometers were deployed. The selection of siteswas carried out so that the different types of urban environment (Oke, 2006) are documented. The Urban Heat Island (UHI)is discernible mainly at night, when radiative conditions are well established the day before. It is estimated to 1°C onaverage for the summer, 3-4°C during nights of fine weather. It reached 6°C during the warmest periods of the 2014 summer.A cool axis through the agglomeration shows that vegetation and water can sensibly mitigate the ICU effect.

TempératuresUrban Heat Island (UHI)[SDU.STU.CL] Sciences of the Universe [physics]/Earth Sciences/ClimatologyRégression-krigeage[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/ClimatologyMeasurementsTemperatureIlot de Chaleur Urbain (ICU)[ SDU.STU.CL ] Sciences of the Universe [physics]/Earth Sciences/ClimatologyMesuresRegression-kriging
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The effect of some amines and alcohols on the organized structure of [bmim][BF4] investigated by 1H NMR spectroscopy

2008

The effect exerted by some amines and alcohols on the 1H NMR spectra of 1-butyl-3- methylimidazolium tetrafluoroborate [bmim][BF4] has been studied. This ionic liquid, which is one of the most widely used, is characterized by a high structural order degree, as a consequence of the symmetry and the coordination ability of the anion. In order to have information about the dependence of the detected effects on the alcohol or amine structure, some different primary, secondary and tertiary amines and alcohols have been considered. Furthermore, in the case of amines, their basicity has been also taken into account. Both amines and alcohols induce variation in chemical shifts values and signal mul…

TetrafluoroborateChemical shiftOrganic ChemistryInorganic chemistryionic liquids 1H NMR measurementsAlcoholSettore CHIM/06 - Chimica Organicachemistry.chemical_compoundchemistryComputational chemistryIonic liquidProton NMRMoleculeAmine gas treatingMultiplicity (chemistry)
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Binary Mixtures of Ionic Liquids: A Joint Approach to Investigate their Properties and Catalytic Ability

2012

The growing interest in the properties and applications of ionic liquids has recently led to research into the possibility of using their binary mixtures. This work reports on the effects of binary mixtures of ionic liquids on the outcome of organic reactions such as the mononuclear rearrangement of heterocycles and the solvatochromic behavior of Nile Red. Binary mixtures formed by ionic liquids differing in the structure of the cation and the anion are taken into account. In particular, ionic liquids such as 1-benzyl-3- butylimidazolium bis(trifluoromethanesulfonyl)imide, 1-(2,3,4,5,6- pentafluorobenzyl)-3-butylimidazolium bis(trifluoromethanesulfonyl)imide, and 1-benzyl-3-butylimidazolium…

TetrafluoroborateInorganic chemistryIonic bondingionic liquids binary mixtures kinetic measurements NMRNuclear magnetic resonance spectroscopyAtomic and Molecular Physics and OpticsIonSolventchemistry.chemical_compoundchemistryIonic liquidPhysical and Theoretical ChemistrySolvent effectsImideChemPhysChem
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LAAE-14, a new in vitro inhibitor of intracellular calcium mobilization, modulates acute and chronic inflammation.

2003

Abstract A new lipidic acid-amido ether derivative (LAAE-14) able to reduce dose-dependently the calcium increases mediated either by calcium ionophore ionomycin, by the endoplasmic reticular Ca 2+ -ATPase inhibitor thapsigargin, or by the chemotactic tripeptide N -formyl- l -methionyl- l -leucyl- l -phenylalanine (fMLP), in human neutrophils as well as in murine peritoneal macrophages, but not ATP, has been evaluated as a potential anti-inflammatory drug. This compound attenuated leukocyte activation by means of its inhibitory effect on the respiratory burst elicited in both types of cells by 12- O -tetradecanoyl phorbol 13-acetate, by inhibition of the degranulation process induced by cyt…

ThapsigarginNeutrophilschemistry.chemical_elementCalciumPharmacologyCarrageenanBiochemistryLeukotriene B4Calcium in biologyDinoprostonechemistry.chemical_compoundMiceCell MovementAnimalsEdemaHumansCytochalasin BNitritesPharmacologyInflammationPlatelet-activating factorPancreatic ElastaseTumor Necrosis Factor-alphaZymosanArthritis ExperimentalRatsDisease Models AnimalchemistryBiochemistryIonomycinAcute DiseaseChronic DiseaseLuminescent MeasurementsPhorbolMacrophages PeritonealTumor necrosis factor alphaCalciumBiochemical pharmacology
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Rapid and eco-friendly synthesis of graphene oxide-silica nanohybrids

2014

The increasing interest in Graphene oxide (GO) is due to many issues: the presence of both sp2-conjugated atoms and oxygen-containing functional groups provides a strong hydrophilicity and the possibility to further functionalize it with other molecules (i.e. π-π interactions covalent attachment etc.) [1]. Furthermore since the GO is biocompatible and noncytotoxic many studies have been recently focused on the development of GO-based nanodevices for bioimaging DNA detection drug delivery. Due to their low cytotoxicity and large internal surface area silica nanoparticles have been taken into account as promising material for biolabeling and drug loading/delivery. Particular consideration has recently been demonstrated for GO-silica composites because of the potentialities for electrical applications their chemical inertia and stability toward ions exposure. The possibility to combine the extraordinary properties of GO and silica offers several advantages for the realization of nanoprobes for biological applications and of biosensor [12]. The strategy for the fabrication of GO-nanosilica nanohybrids can be schematized as follows: (i) synthesis of GO by oxidizing graphite powder with the method described by Marcano et al. [3] (ii) Preparation of oxygen-loaded silica nanoparticles by thermal treatments in controlled atmosphere in order to induce high NIR emission at 1272 nm from high purity silica nanoparticles. (iii) preparation of GrO-silica nanohybrid films via rapid solvent casting in water. The nanohybrids were tested by XPS FTIR Raman analysis UV photoluminescence analysis TGA Zeta potential measurements electrical tests AFM and SEM. Several nanohybrids were prepared by combining two different typologies of GO and two different samples of silica.
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Canopy Architecture Appraisal by Fractal Dimension of 'Flordastar' Peach Trees Grafted onto Different Rootstocks

2007

The objective of this research was to evaluate the modification of canopy architecture of ''Flordastar'' peach (Prunus persica L. Batsch) grafted onto rootstocks with different vigour, by the use of fractal dimension (D). The hypothesis was that different vigour rootstocks are able to modify the complexity of the branching pattern and that this effect can be assessed by a geometric parameter such as the fractal dimension (D) of the 2D projection of tree branching structure. The observations were carried out in a four-year-old experimental orchard of cv. ''Flordastar'' peach trees grafted onto Ishtara, Barrier, GF677 and MrS 2/5 rootstocks. On digital pictures of leafless, dormant peach tree…

The objective of this research was to evaluate the modification of canopy architecture of ''Flordastar'' peach (Prunus persica L. Batsch) grafted onto rootstocks with different vigour by the use of fractal dimension (D). The hypothesis was that different vigour rootstocks are able to modify the complexity of the branching pattern and that this effect can be assessed by a geometric parameter such as the fractal dimension (D) of the 2D projection of tree branching structure. The observations were carried out in a four-year-old experimental orchard of cv. ''Flordastar'' peach trees grafted onto Ishtara Barrier GF677 and MrS 2/5 rootstocks. On digital pictures of leafless dormant peach trees the tree skeleton was manually depicted by an image analysis software to measure total length and angles of insertion of branches. Bitmaps of the skeleton were then subjected to a specific software (FDCALC) able to calculate D by the "box counting" method. To account for the error introduced by analyzing a three dimensional structure with its 2D projection measurements were done on two images per tree taken from two different viewing angles. Results are shown in relation to tree vigour of the scion/stock combination. Fractal dimension was related to the vigour ranking of the graft combinations tested. In particular vigorous scion/stock combinations showed the highest D.HorticultureCanopy architectureHorticultureRootstockFractal dimensionMathematics
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