A5101399083- Field-Flow Fractionation Techniques
- Solidification and crystal growth phenomena
- Fluid Dynamics and Mixing
- Particle Dynamics in Fluid Flows
- Chemical Thermodynamics and Molecular Structure
- Calibration and Measurement Techniques
- Fluid Dynamics and Heat Transfer
- Fluid Dynamics and Thin Films
- Luminescence Properties of Advanced Materials
- nanoparticles nucleation surface interactions
- Innovative Microfluidic and Catalytic Techniques Innovation
- Phase Change Materials Research
- Nuclear reactor physics and engineering
- Spacecraft and Cryogenic Technologies
- Magnetic Properties and Synthesis of Ferrites
- Statistical and numerical algorithms
- Phase Equilibria and Thermodynamics
- Planetary Science and Exploration
- Advanced Thermodynamic Systems and Engines
- Advanced Thermodynamics and Statistical Mechanics
- Metallurgical Processes and Thermodynamics
- Fluid Dynamics and Turbulent Flows
- thermodynamics and calorimetric analyses
- Heat Transfer and Boiling Studies
- Advanced Condensed Matter Physics
Universitat Rovira i Virgili
2015-2024
Enpro Consult (Bulgaria)
2022
Inter-American Development Bank
2022
Institut d'Estudis Espacials de Catalunya
2009-2020
Centre National d'Études Spatiales
2019
Escuela Superior Politecnica del Litoral
2006-2009
Universitat de Barcelona
1986-2008
Universitat Politècnica de Catalunya
2006
Bulgarian Academy of Sciences
1997
Instituto de Ciencia de Materiales de Madrid
1997
It is suspected that the as-compacted state of heavily compacted clays used as possible engineered barriers for nuclear waste disposal time dependent, and further change may occur in material, even at constant water content density. This paper presents an investigation time-dependent microstructure changes MX80 clay bentonite various dry densities contents. Microstructure based on mercury intrusion pore size distribution measurements scanning electron microscopy (SEM). Results obtained by...
Present as well future challenges of space exploration point to the need for improved thermal control systems. The "Effect Marangoni Convection on Heat Transfer in Phase Change Materials" experiment, which is approved by ESA execution board International Space Station, aims contribute directly current knowledge and basic understanding heat mass transport phase change materials (PCMs) that incorporate a free surface reduced gravity. experiment will apply fixed temperatures opposite ends PCM...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 377:289-297 (2009) - DOI: https://doi.org/10.3354/meps07792 Feeding ecology of yellow-legged gulls Larus michahellis in western Mediterranean: a comparative assessment using conventional and isotopic methods Raül Ramos1,*, Francisco Ramírez1, Carolina Sanpera1, Lluís Jover2, Xavier Ruiz1,† 1Departament de...
The presence of thermocapillary (Marangoni) convection in microgravity may help to enhance the heat transfer rate phase change materials (PCMs) space applications. We present a three-dimensional numerical investigation nonlinear dynamics melting PCM placed cylindrical container filled with n-octadecane and surrounded by passive air. exchange between ambient air is characterized terms Biot number, when temperature has linear profile. effect on topology front studied varying applied difference...
We present a comprehensive study on heat transfer in phase-change materials (PCMs), focusing both melting and solidification phases, different temperature scenarios, an assessment of practical implementation aspects, Marangoni convection. The research examines rates during the melting-solidification cycle, with focus gallium (Ga) n-eicosane (C20), latter being candidate for MarPCM project aboard ISS [1]. paper explores scenarios using Ga to optimize PCM performance. N-eicosane requires...
The magnetic properties of ${\mathrm{BaFe}}_{12}$${\mathrm{O}}_{19}$ and ${\mathrm{BaFe}}_{10.2}$${\mathrm{Sn}}_{0.74}$${\mathrm{Co}}_{0.66}$${\mathrm{O}}_{19}$ single crystals have been investigated in the temperature range (1.8 to 320 K) with a varying field from -5 +5 T applied parallel perpendicular c axis. Low-temperature relaxation, which is ascribed domain-wall motion, was performed between 1.8 15 K. relaxation magnetization exhibits linear dependence on logarithmic time. viscosity...
A new method to create a jet of virtually monodisperse microbubble suspension prescribed bubble size into quiescent cavity is proposed. The insensitive gravity and based on the creation slug flow at T junction in capillary tube before injection. We develop theoretical analysis that establishes validity efficiencyofthe method,ascontrolledbythecrossflowWebernumber,andyields asimple explicitprediction forthe terms injection parameters. operates efficiently for small Weber numbers, yet it...
Convective flows of a small Prandtl number fluid contained in two-dimensional cavity subject to lateral thermal gradient are numerically studied by using different techniques. The aspect ratio (length height) is kept at around 2. This value found optimal make the flow most unstable while keeping basic single-roll structure. Two cases boundary conditions on horizontal plates considered: perfectly conducting and adiabatic. For increasing Rayleigh numbers we find transition from steady periodic...
The growth of rare-earth (RE = Nd, Tb, Ho, Er, Tm, and Yb) doped KTiOPO4 (KTP) single crystals from high-temperature solutions [K2O−P2O5−TiO2−RE2O3 (or Tb4O7)] was investigated. concentration regions crystallization RE-doped KTP, the maximum (critical) RE concentrations in solution without losing KTP phase corresponding upper limit ions incorporated into lattice were obtained experimentally. are significantly narrower than region undoped KTP. Above a certain critical solution, phosphate...
Within the 5th EU Framework Programme a technology platform called EEFAE (Efficient and Environmentally Friendly Aero-Engine) is funded by EC. One part of t he consists CLEAN programme (Component vaLidator for Environmentally– friendly Aero-eNgine) that aims long term application new technologies in aero engines [1, 2, 3, 4].
The melting of a phase change material (PCM) in cuboidal domain under microgravity conditions is investigated numerically. upper surface the PCM free (in contact with air, for example) and variations its tension drive thermocapillary convection liquid phase, which significantly enhances heat transfer accelerates melting. Furthermore, fraction during associated transitions among various modes dynamics, including an oscillatory instability to hydrothermal waves. While characteristics dynamics...
The presence of tungsten impurities in ${\mathrm{KTiOPO}}_{4}$ (KTP) crystals grown from molten tungstate solutions has been observed by means electron paramagnetic resonance (EPR) at 90 K. angular dependence the EPR signals and their behavior under thermal treatments allow us to distinguish two centers. analysis measured g hyperfine matrices for both centers indicates that are due ${\mathrm{W}}^{5+}$ located titanium sites KTP structure. Moreover, it is shown pentavalent incorporated as...