Search results for "Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft"

showing 7 items of 7 documents

Polyester microplastic fibers affect soil physical properties and erosion as a function of soil type

2021

Microplastics are recognized as a factor of global change contaminating many environmental compartments. Agricultural soils are very likely to receive microplastic contamination and are of particular concern due to their role in food production. Microplastic fibers have already been shown to be able to affect soil properties, but their effect on different soil types is poorly understood. Moreover, limited information is available on how the presence of this pollutant can affect soil water erosion processes, which are extremely important issues in many environments. In the light of this, we performed two experiments (carried out on a microscale) to investigate how the presence of polyester m…

570soil erosion600 Technik Medizin angewandte Wissenschaften::630 Landwirtschaft::630 Landwirtschaft und verwandte Bereiche550Microplastic in soil500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologieerosioncomplex mixtures630Settore AGR/02 - Agronomia E Coltivazioni ErbaceePolyester microplasticsoil typesoil propertiessoil physical properties500 Naturwissenschaften und Mathematik::550 Geowissenschaften Geologie::550 GeowissenschaftenSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-Forestali
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Das Buch der Güter Livlands und Oesels

1863

:HUMANITIES and RELIGION::History and philosophy subjects::History subjects::Legal history [Research Subject Categories]Livländische VerwaltungsgeschichteGüter LivlandsLauksaimniecības vēsture - LivonijaLivländische LandwirtschaftsgeschichteGüter Ösels:HUMANITIES and RELIGION::History and philosophy subjects::History subjects::Agricultural history [Research Subject Categories]Livonijas administratīvā vēstureLivonijas vēstureÖsels
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Combined proton NMR wideline and NMR relaxometry to study SOM-water interactions of cation-treated soils

2013

Abstract Focusing on the idea that multivalent cations affect SOM matrix and surface, we treated peat and soil samples by solutions of NaCl, CaCl2 or AlCl3. Water binding was characterized with low field 1H-NMR-relaxometry (20 MHz) and 1H wideline NMR spectroscopy (400 MHz) and compared to contact angles. From 1H wideline, we distinguished mobile water and water involved in water molecule bridges (WaMB). Large part of cation bridges (CaB) between SOM functional groups are associated with WaMB. Unexpectedly, 1H NMRrelaxometry relaxation rates suggest that cross-linking in the Al-containing peat is not stronger than that by Ca. The relation between percentage of mobile water and WaMB water in…

Dewey Decimal Classification::500 | Naturwissenschaften::550 | GeowissenschaftenDewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften BiologieDewey Decimal Classification::600 | Technik::630 | Landwirtschaft VeterinärmedizinAnalytical chemistrySoil organic matter (SOM); Low field 1H NMR relaxometry; 1H wideline NMR spectroscopy; Contact angle; Cation bridges; Water molecule bridges.TA Engineering (General). Civil engineering (General)soil organic matter (som)Low field H-1 NMR relaxometrystateContact angleNuclear magnetic resonancewater molecule bridgesddc:550ddc:630natural organic-mattercontact angleWater Science and TechnologyFluid Flow and Transfer Processeschemistry.chemical_classificationhumic substancesWater molecule bridges.Nuclear magnetic resonance spectroscopycation bridgesCation bridgemultiexponential decay datanuclear-magnetic-resonanceH-1 wideline NMR spectroscopyProton NMRWater bindingTC1-978Relaxometryuniform-penalty inversionlow field 1h nmr relaxometrySettore AGR/13 - Chimica AgrariaContext (language use)1h wideline nmr spectroscopyforest soilsCation bridgesddc:570sandy soilOrganic mattercontact-angleContact angleSoil organic matter (SOM)repellencyMechanical EngineeringHydraulic engineeringchemistrySoil waterWater molecule bridgesJournal of Hydrology and Hydromechanics
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Konferenz der Nationalen Komitees der Weltkraftkonferenz Lettlands, Estlands und Litauens: [Vorträge]

1939

Kopsavilkumi angļu valodā

Elektrifizierungslage in EstlandElectric power productionElectricity:TECHNOLOGY::Electrical engineering electronics and photonics::Electric power engineering [Research Subject Categories]Elektrifizierung der LandwirtschaftElektroenerģijas ražošana - BaltijaElektrifizierungslage in LettlandElektroenerģijaElektrifizierungslage in LitauenElektrizitätswerke
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Influence of the channel design on the heat and mass exchange of induction channel furnace

2011

PurposeThe purpose of this paper is to present in‐depth numerical modelling of heat and mass exchange in industrial induction channel furnace (ICF).Design/methodology/approachThe turbulent heat and mass exchange in the melt is calculated using a three‐dimensional (3D) electromagnetic model and a 3D transient large eddy simulation method. The simulation model has been verified by flow velocity and temperature measurements, which were carried out using an industrial sized channel inductor operating with Wood's metal as a low temperature model melt.FindingsThe ICF is well‐established for melting, holding and casting in the metallurgical industry. But there are still open questions regarding th…

EngineeringElectromagnetic modelsLarge Eddy simulation methodsChannel geometryHeat and mass transferDewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und MaschinenbauMechanical engineeringInductorTemperature measurementModellingMetallurgical industryChannel designExperimentWood's metalMass transferLow temperaturesIndustryMass transferWood's metalElectrical and Electronic Engineeringddc:510Low frequency oscillationsMass exchangeTemperature measurementbusiness.industryApplied MathematicsThree dimensionalFurnaceMechanicsDesign/methodology/approachDewey Decimal Classification::500 | Naturwissenschaften::510 | MathematikComputer Science ApplicationsComputational Theory and MathematicsFlow velocityThree-dimensional (3D)Casting (metalworking)Numerical modellingMetallurgySimulation modelddc:620businessSimulationCommunication channelLarge eddy simulationNumerical analysis
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Numerical studies of the melting process in the induction furnace with cold crucible

2008

PurposeAims to present recent activities in numerical modeling of cold crucible melting process.Design/methodology/approach3D numerical analysis was used for electromagnetic problem and 3D large eddy simulation (LES) method was applied for fluid flow modeling.FindingsThe comparative modeling shows, that higher H/D ratio of the melt is more efficient when total power consumption is considered, but this advantage is held back by higher heat losses through the crucible walls. Also, calculations reveal that lower frequencies, which are energetically less effective, provide better mixing of the melt.Originality/value3D electromagnetic model, which allows to take into account non‐symmetrical dist…

EngineeringFurnacesMixing (process engineering)Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und MaschinenbauThermodynamicsCrucibleInduction furnaceElectromagnetic problemsModellingPhysics::Fluid DynamicsElectromagnetismElectromagnetismFluid dynamicsddc:510Electrical and Electronic Engineeringbusiness.industryApplied MathematicsNumerical analysisLarge eddy simulationMechanicsMeltingCold crucibleDewey Decimal Classification::500 | Naturwissenschaften::510 | MathematikComputer Science ApplicationsComputational Theory and MathematicsCruciblesddc:620Joule heatingbusinessSimulationLarge eddy simulationNumerical analysis
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Particle transport in recirculated liquid metal flows

2008

PurposeAims to present recent activities in numerical modeling of turbulent transport processes in induction crucible furnace.Design/methodology/approach3D large eddy simulation (LES) method was applied for fluid flow modeling in a cylindrical container and transport of 30,000 particles was investigated with Lagrangian approach.FindingsParticle accumulation near the side crucible boundary is determined mainly by the ρp/ρ ratio and according to the presented results. Particle settling velocity is of the same order as characteristic melt flow velocity. Particle concentration homogenization time depends on the internal flow regime. Separate particle tracks introduce very intensive mass exchang…

Liquid metalMaterials scienceFurnacesDewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und MaschinenbauMechanical engineeringHomogenization (chemistry)ModellingPhysics::Fluid DynamicsSettlingRecirculated liquid metal flowsFluid dynamicsddc:510Electrical and Electronic EngineeringCrucible furnacesMelt flow indexTurbulent transport processesInternal flowTurbulenceApplied MathematicsLarge eddy simulationParticle physicsMechanicsComputer simulationDewey Decimal Classification::500 | Naturwissenschaften::510 | MathematikComputer Science ApplicationsComputational Theory and Mathematicsddc:620SimulationLiquid metalsNumerical analysisParticles (particulate matter)Large eddy simulationCOMPEL - The international journal for computation and mathematics in electrical and electronic engineering
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