A5022606322- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Mesoporous Materials and Catalysis
- Polymer Surface Interaction Studies
- Atmospheric Ozone and Climate
- Polymer Nanocomposites and Properties
- Nanoparticle-Based Drug Delivery
- Atomic and Molecular Physics
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Study of Mite Species
- Semiconductor materials and interfaces
- Catalytic Processes in Materials Science
- Micro and Nano Robotics
- Porphyrin and Phthalocyanine Chemistry
- Agriculture Sustainability and Environmental Impact
- Extraction and Separation Processes
- Planetary Science and Exploration
- Experience-Based Knowledge Management
- Advanced Photocatalysis Techniques
- Thermal Radiation and Cooling Technologies
- Ga2O3 and related materials
- Metallurgical and Alloy Processes
- Soil Carbon and Nitrogen Dynamics
- Hydrogels: synthesis, properties, applications
University of Lisbon
2002-2023
Universidade de São Paulo
2022
Instituto Politécnico de Lisboa
2020
Observatoire Aquitain des Sciences de l'Univers
2008
Arcetri Astrophysical Observatory
2002-2004
We have considered the thermal equilibrium in pre-protostellar cores approximation where dust temperature is independent of interactions with gas and heated both by collisions grains ionization cosmic rays. then used these results to study stability hydrostatic limit pressure dominates over magnetic field turbulence. compare density distribution derived this manner obtained isothermal case. find that for characteristics similar those observed nearby molecular clouds, temperatures are coupled...
Soil animal communities include more than 40 higher-order taxa, representing over 23% of all described species. These animals have a wide range feeding sources and contribute to several important soil functions ecosystem services. Although many studies assessed macroinvertebrate in Brazil, few them been published journals even fewer made the data openly available for consultation further use. As part ongoing efforts synthesise global macrofauna increase amount openly-accessible GBIF other...
We have observed the dark cloud Barnard 68 with SCUBA at 850 μm and SIMBA 1.2 mm. The submillimetre millimetre dust emission correlate well extinction map of Alves et al. (2001). AV/850 correlation is clearly not linear suggests lower temperatures for in inner core cloud. Assuming a model temperature gradient, we derive cloud-averaged emissivities (normalised to V-band efficiency) find . These values are compared other determinations this wavelength regime expectations models diffuse grain...
To investigate the impact of surface functionalization mesoporous silica nanoparticle (MSN) carriers in physical state, molecular mobility and release Fenofibrate (FNB) MSNs with ordered cylindrical pores were prepared. The was modified either (3-aminopropyl) triethoxysilane (APTES) or trimethoxy(phenyl)silane (TMPS), density grafted functional groups quantified via 1H-NMR. incorporation ~3 nm promoted FNB amorphization, as evidenced FTIR, DSC dielectric analysis, showing no tendency to...
Among a variety of inorganic-based nanomaterials, mesoporous silica nanoparticles (MSNs) have several attractive features for application as delivery system, due to their high surface areas, large pore volumes, uniform and tunable sizes, mechanical stability, great diversity functionalization options. We developed novel hybrid MSNs composed nanostructure core pH-responsive polymer shell. The shell was prepared by RAFT polymerization 2-(diisopropylamino)ethyl methacrylate (pKa ~6.5), using...
Stimuli-responsive polymer materials are used in smart nanocarriers to provide the stimuli-actuated mechanical and chemical changes that modulate cargo delivery. To take full advantage of potential stimuli-responsive polymers for controlled delivery applications, these have been grafted surface mesoporous silica particles (MSNs), which mechanically robust, very large areas available pore volumes, uniform tunable sizes a diversity functionalization options. Here, we explore impact different...
We compute polarization maps for molecular cloud cores modeled as magnetized singular isothermal toroids, under the assumption that emitting dust grains are aspherical and aligned with large-scale magnetic field. show that, depending on inclination of toroid line-of-sight, bending field lines resulting from need to counteract inward pull gravity naturally produces a depolarization effect toward centre map. decrease degree increasing intensity different viewing angles frequencies, we an...
We present the results of a three-dimensional Monte Carlo radiative transfer code for starless molecular cloud cores heated by an external isotropic or non-isotropic interstellar radiation field. The computes dust temperature distribution inside model clouds with specified but arbitrary density profiles. In particular we examine in detail spherical (Bonnor-Ebert) clouds, axisymmetric and non-axisymmetric toroids, stellar source addition to general For these configurations, also maps emergent...
Highly efficient pH-modulated cargo release was achieved with a new hybrid nanocarrier composed of mesoporous silica core functionalized pores and grafted pH-responsive crosslinked polymer shell 2-(diisopropylamino)ethyl methacrylate (pKa ≈ 6.5). The retention/release performance the system optimized by novel approach using selective functionalization to tune carrier-cargo interaction tunning amount polymer. features excellent retention cationic at low pH burst higher pH. This results from...
Brazil is one of the main producers in agricultural and forestry sector worldwide, with production systems based on high consumption inputs that contribute to levels greenhouse gas (GHG) emissions. This paper presents an analysis scenario national GHG emissions carbon footprints major agriculture, including livestock forestry, potential for soil storage as a mitigation strategy under these systems. The sources are beef cattle due enteric fermentation management soils through use nitrogen...
We present studies of polarized cloud emission that are in progress at the Helsinki University Observatory. Two projects concerned with FIR/sub-mm dust polarization, one based on collapse models protostellar cores, other 3D MHD simulations larger clouds. also examine Zeeman splitting and relations between derived average magnetic field actual strengths.
We compute polarization maps for molecular cloud cores modeled as magnetized singular isothermal toroids, under the assumption that emitting dust grains are aspherical and aligned with large-scale magnetic field. show that, depending on inclination of toroid line-of-sight, bending field lines resulting from need to counteract inward pull gravity naturally produces a depolarization effect toward centre map. decrease degree increasing intensity different viewing angles frequencies, we an...