Search results for " mixing"

showing 10 items of 270 documents

Modeling self-sustaining waves of exothermic dissolution in nanometric Ni-Al multilayers

2016

Abstract The self-sustained propagating reaction occurring in nanometric metallic multilayers was studied by means of molecular dynamics (MD) and numerical modeling. We focused on the phenomenon of the exothermic dissolution of one metallic reactant into the less refractory one, such as Ni into liquid Al. The exothermic character is directly related to a negative enthalpy of mixing. An analytical model based on the diffusion-limited dissolution [1] coupled with heat transfer was derived to account for the main aspects of the process. Together, several microscopic simulations were carried out. The first series were set up to obtain all the parameters governing the process, including the heat…

010302 applied physicsExothermic reactionMaterials sciencePolymers and PlasticsMetals and AlloysThermodynamics02 engineering and technology021001 nanoscience & nanotechnologyEnthalpy of mixing01 natural sciencesElectronic Optical and Magnetic MaterialsMetalMolecular dynamicsCrystallographyScientific methodvisual_art0103 physical sciencesHeat transferCeramics and Compositesvisual_art.visual_art_mediumDiffusion (business)0210 nano-technologyDissolutionActa Materialia
researchProduct

Line parameters and shapes of high clusters: R-branch of the nu3 band of CH4 in He mixtures

2002

International audience; The IR absorption spectra of CH4 in pure gas and in mixture with helium were studied in the region of nu3 band at higher J line clusters R(17)-R(22). The frequencies and intensities of rotation-vibration lines were estimated from the experimental spectra at Doppler shape conditions. The line frequencies and intensities were calculated and used for the attribution of overlapped lines in clusters. The calculated line intensities are close to the experimental values. The calculated frequency structure of the higher J manifolds are somewhat wider than the observed one. The shapes of helium-broadened line clusters were compared with those calculated accounting for line mi…

010504 meteorology & atmospheric sciences[ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph]chemistry.chemical_elementSemiclassical physics01 natural sciencesSpectral linesymbols.namesakeLine parameters[PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph]0103 physical sciencesRelaxation matrixSpectroscopyMixing (physics)Helium0105 earth and related environmental sciencesLine (formation)PhysicsRadiationIr absorption010304 chemical physicsVibration-rotation spectraLine mixingAtomic and Molecular Physics and OpticschemistrysymbolsAtomic physicsDoppler effectMethane
researchProduct

Effect of Different Modified Atmosphere Packaging on the Quality of Mulberry Fruit (Morus alba L. cv Kokuso 21)

2021

The control of temperature and gas composition is essential to maintain the fresh flavor and quality of perishable fruits like mulberry. This study presented a modified atmosphere experiment (MAP) for fresh fruit showing the potential benefits of innovative gas mixing with argon. The effects of MAP were studied on the physicochemical and qualitative attributes of mulberry preserved at4±1°C and90±5%R.H. Fresh mulberries were packaged with different gas combinations: MAP1 (4%O2+6%CO2+90%N2), MAP2 (10%O2+5%CO2+85%Ar), CTR1 (20.9%O2+0.04%CO2), and CTR2 (10%O2+5%CO2+85%N2). Changes in quality parameters were evaluated after 0, 4, 8, and 12 days of storage. Mulberries packaged with MAP had a lowe…

0106 biological sciencesArticle SubjectNutrition. Foods and food supplyChemistry04 agricultural and veterinary sciencesSensory profileTP368-456Gas mixing01 natural sciencesFood processing and manufacture040501 horticultureSettore AGR/03 - Arboricoltura Generale E Coltivazioni ArboreeHorticultureModified atmosphereTX341-641Fruit juice0405 other agricultural sciencesFlavorMAP small fruit postharvest physiologyResearch Article010606 plant biology & botanyFood ScienceInternational Journal of Food Science
researchProduct

Guano-Derived Nutrient Subsidies Drive Food Web Structure in Coastal Ponds.

2016

A stable isotope study was carried out seasonally in three coastal ponds (Marinello system, Italy) affected by different gull guano input to investigate the effect of nutrient subsidies on food web structure and dynamics. A marked 15N enrichment occurred in the pond receiving the highest guano input, indicating that gull-derived fertilization (guanotrophication) had a strong localised effect and flowed across trophic levels. The main food web response to guanotrophication was an overall erosion of the benthic pathway in favour of the planktonic. Subsidized primary consumers, mostly deposit feeders, switched their diet according to organic matter source availability. Secondary consumers and,…

0106 biological sciencesPhysiologyMarine and Aquatic Scienceslcsh:Medicine01 natural sciencesCharadriiformesFood chainIsotopescoastal pondsFood Web StructureMedicine and Health Scienceslcsh:ScienceTrophic levelMultidisciplinaryEcologyfood webEcologyConsumerFishesFood webSeabirdsGullsCommunity EcologyItalyBenthic zoneVertebratesGuanoSeasonsResearch ArticleFood Chainguano; food web; benthos; mixing model; isotope; coastal pondsbentho010603 evolutionary biologyBirdsAnimalsEcosystemguanoPondsisotopeEcosystemNutrition010604 marine biology & hydrobiologyEcology and Environmental Sciencesfungilcsh:RFood ConsumptionOrganismsDetritivoreBiology and Life SciencesNutrientsBodies of WaterModels Theoreticalmixing modelInvertebratesDietFisheryFoodEarth SciencesEnvironmental sciencelcsh:QPhysiological ProcessesPLoS ONE
researchProduct

Generation and Coherent Control of Pulsed Quantum Frequency Combs

2018

We present a method for the generation and coherent manipulation of pulsed quantum frequency combs. Until now, methods of preparing high-dimensional states on-chip in a practical way have remained elusive due to the increasing complexity of the quantum circuitry needed to prepare and process such states. Here, we outline how high-dimensional, frequency-bin entangled, two-photon states can be generated at a stable, high generation rate by using a nested-cavity, actively mode-locked excitation of a nonlinear micro-cavity. This technique is used to produce pulsed quantum frequency combs. Moreover, we present how the quantum states can be coherently manipulated using standard telecommunications…

0301 basic medicineDensity matrixOptics and PhotonicsPhotonGeneral Chemical EngineeringSettore ING-INF/01 - ElettronicaGeneral Biochemistry Genetics and Molecular Biology03 medical and health sciencesEngineering0302 clinical medicineQuantum stateQuantum DotsQuantumQCQuantum opticsPhysicsGeneral Immunology and Microbiologybusiness.industryGeneral NeuroscienceNonlinear opticsSettore ING-INF/02 - Campi Elettromagnetici030104 developmental biologyCoherent controlQuantum optics Integrated photonic devices Mode-locked lasers Nonlinear optics Four-wave mixing Frequency combs High- dimensional statesFrequency domainOptoelectronicsbusiness030217 neurology & neurosurgeryJournal of Visualized Experiments
researchProduct

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
researchProduct

Vector FWM in optical fibers: tuning techniques and applications

2022

Recientemente, el efecto no lineal de mezcla de cuatro ondas (FWM) en fibras ópticas ha atraído un gran interés para el desarrollo de nuevas fuentes de luz de fibra óptica debido a la emisión de luz múltiple producida por este efecto no lineal. En los últimos años, estas fuentes de luz basadas en FWM han demostrado una gran utilidad en áreas como la óptica cuántica y la microscopía avanzada basada en efecto Raman. Además, según el estado de polarización de la luz de bombeo responsable del efecto FWM y la birrefringencia de la fibra, la luz producida por FWM puede presentar diferentes propiedades de polarización dada la naturaleza vectorial de FWM. Esto posibilita el diseño y desarrollo de f…

:FÍSICA [UNESCO]polarization modulation instabilityUNESCO::FÍSICAtunable light sourcemicrostructured optical fibersvector four-wave mixing
researchProduct

Globorotalia truncatulinoides in the Mediterranean Basin during the Middle–Late Holocene: Bio-Chronological and Oceanographic Indicator

2022

The planktonic foraminiferal species Globorotalia truncatulinoides is widely used as a biostratigraphic proxy for the Quaternary in the Mediterranean region. High-resolution quantitative studies performed on sediment cores collected in the central and western Mediterranean Sea evidence a significant abundance of G. truncatulinoides during the Middle Holocene. The robust chronological frame allows us to date this bio-event to 4.8–4.4 ka Before Present (BP), very close to the base of the Meghalayan stage (4.2 ka BP). As a consequence, we propose that G. truncatulinoides can be considered a potential marker for the Middle–Late Holocene chronological subdivision. G. truncatulinoides is a deep-d…

<i>Globorotalia truncatulinoides</i>; Meghalayan stage; 4.2 event; vertical mixing; Mediterranean SeaGloborotalia truncatulinoides4.2 eventGloborotalia truncatulinoides; Meghalayan stage; 4.2 event; vertical mixing; Mediterranean Seavertical mixingMediterranean SeaGeneral Earth and Planetary SciencesMeghalayan stageSettore GEO/01 - Paleontologia E Paleoecologia
researchProduct

Assessment of determinants affecting the dual topology of hepadnaviral large envelope proteins

2004

For functional diversity, the large (L) envelope protein of hepatitis B virus (HBV) acquires a dual transmembrane topology via co-translational membrane integration of the S region and partial post-translational translocation of the preS subdomain. Because each process requires the second transmembrane segment (TM2), we explored the action of this determinant by using protease protection analysis of mutant L proteins. We demonstrated that neither the disruption of a leucine zipper-like motif by multiple alanine substitutions nor the flanking charges of TM2 affected the topological reorientation of L. The dispensability of both putative subunit interaction modules argues against a link betwe…

AlanineHepatitis B virusHepatitis B virusVirus AssemblyAmino Acid MotifsMolecular Sequence DataProtein domainPhenotype mixingBiological TransportBiologyEndoplasmic Reticulummedicine.disease_causeVirologyTransmembrane domainDual topologyAmino Acid SubstitutionViral Envelope ProteinsVirologyMembrane topologymedicineHepadnavirusAmino Acid SequenceProtein Processing Post-TranslationalJournal of General Virology
researchProduct

Alveolar Gas Mixing in Chronic Pulmonary Hyperinflation

1991

It is well known that in chronic pulmonary hyperinflation defects in intrapulmo-nary gas mixing and in V/Q ratio are likely to occur.

Alveolar gasFunctional residual capacityChemistryDead spacePulmonary hyperinflationAlveolar dead spaceQuiet breathingMechanicsGas mixingMixing (physics)
researchProduct