CdSe/ZnS Quantum Dots modificados con Calix[8]arenos como nanosensor de fullereno. Monitorización de aguad

II Encuentro sobre nanociencia y nanotecnología de investigadores y tecnólogos de la Universidad de Córdoba. NANOUC

CFD investigation of a complete floating offshore wind turbine

This chapter presents numerical computations for floating offshore wind turbines for a machine of 10-MW rated power. The rotors were computed using the Helicopter Multi-Block flow solver of the University of Glasgow that solves the Navier-Stokes equations in integral form using the arbitrary Lagrangian-Eulerian formulation for time-dependent domains with moving boundaries. Hydrodynamic loads on the support platform were computed using the Smoothed Particle Hydrodynamics method. This method is mesh-free, and represents the fluid by a set of discrete particles. The motion of the floating offshore wind turbine is computed using a Multi-Body Dynamic Model of rigid bodies and frictionless joints. Mooring cables are modelled as a set of springs and dampers. All solvers were validated separately before coupling, and the loosely coupled algorithm used is described in detail alongside the obtained results

Estomatitis aftosa recidivante. 1ª parte: tratamientos locales

La estomatitis aftosa recidivante (EAR) es una enfermedad de la cavidad bucal, de etiología desconocida, común en la población general. Se caracteriza por la aparición de brotes recidivantes de aftas en la mucosa de revestimiento, cuyo síntoma fundamental es el dolor. Esto hace que los pacientes que las padecen precisen de medidas terapéuticas para el control de sus episodios. Por ello, el objetivo de este trabajo es clasificar y resumir los diferentes tipos de tratamientos empleados para el control de la EAR y los resultados obtenidos en los diversos estudios llevados a cabo hasta el momento. Ante la diversidad de medidas terapéuticas propuestas para esta patología, decidimos dividir nuestro trabajo de revisión en dos artículos separados, atendiendo en el primero a la terapia local y en el segundo a los tratamientos sistémicos generalmente recomendados

μLC-SERS system using silver-quantum dots substrate for the separation and determination of nucleic acid bases

III Encuentro sobre Nanociencia y Nanotecnología de Investigadores y Tecnólogos Andaluce

A novel silver-quantum dots "sponge" nanocomposite as sers-active substrate

III Encuentro sobre Nanociencia y Nanotecnología de Investigadores y Tecnólogos Andaluce

Antioxidant potential of atmospheric freeze-dried apples as affected by ultrasound application and sample surface

[EN] Atmospheric freeze drying (AFD) yields products of a similar quality to the conventional vacuum freeze-drying technique, but reduces the operating cost. However, it involves very low drying rates. The sample surface/mass ratio is one of the process variables that can be taken into account to reduce drying time. Moreover, power ultrasound (US) can also be used to intensify this process because of its effects on external and internal mass transfer resistance. However, both factors may affect not only the drying time but also the final product quality. Therefore, the aim of this study was to address the influence of both ultrasound application and the sample surface/mass ratio on the drying process and the antioxidant potential of atmospheric freeze-dried apple. For that purpose, two sample geometries with different surface/mass ratio were considered: slabs (30 � 30 � 10 mm3) and cylinders (diameter: 9 mm and height: 30 mm). The samples were freeze dried (􀀀 10°C) with ultrasound application (21.7 kHz) at different power levels (0, 10.3, 20.5, and 30.8 kW/m3). The total phenolic content (TPC), antioxidant capacity (AC), and ascorbic acid content (AA) were measured in the dried apple. The drying time was significantly shorter for cylindrical samples than for slabs, probably due to their higher surface/mass ratio. The application of US increased the drying rate, this increase being greater for the slab than for the cylindrical particles used in this study. In general, AFD reduced the TPC, AC, and AA, the final content being significantly greater for slabs than for cylinders. This fact can also be related to the lower surface/ mass ratio in the case of slabs. US application further reduced TPC, AC, and AA content, probably due to some cellular damage produced by the acoustic waves and to the oxygen transfer improvement. Nevertheless, the bigger particles (slabs) dried with ultrasound needed a 10% of drying time than the smaller ones (cylinders) dried without ultrasound. Moreover both kind of samples presented similar antioxidant potential.The authors acknowledge the financial support of the Generalitat Valenciana (PROMETEOII/2014/005).Moreno, C.; Brines, C.; Mulet Pons, A.; Rosselló, C.; Carcel Carrión, JA. (2017). Antioxidant potential of atmospheric freeze-dried apples as affected by ultrasound application and sample surface. Drying Technology. 35(8):957-968. doi:10.1080/07373937.2016.1256890S95796835

Milk powder agglomerate growth and properties in fluidized bed agglomeration

[EN] Fluidized bed agglomeration is used to produce large and porous dry agglomerates with improved instant properties. Water (or binder solution) is sprayed in the fluidized bed of particles to render their surface sticky. The agglomerate growth results from the repetition of different steps (wetting of the particle surface, particles collision and bridging, and drying) and depends on the processing conditions and product properties. In this work, skim and whole milk powders were fluidized in hot air and agglomerated by spraying water in a bench-scale batch fluidized bed. The aim was to study the impact of the sprayed water flow rate (0 5.5 g.min−1), particle load (300 400 g), initial particle size (200 350 ìm), and composition (skim whole milk) on the growth mechanisms and on the properties of the agglomerates obtained. Powder samples were regularly taken in the fluidized bed during agglomeration and characterized for the size, size distribution, and water content. Whatever the conditions tested, the size increase and the evolution of the particle size distribution during agglomeration were found to mainly depend on the relative amount of water sprayed in the particle bed. Agglomeration occurred in two stages, with first the rapid association of initial particles into intermediate structures, and second, the progressive growth of porous agglomerates. In any case, agglomeration allowed improving instant properties of the milk powder.Barkouti, A.; Turchiuli, C.; Carcel Carrión, JA.; Dumoulin, E. (2013). Milk powder agglomerate growth and properties in fluidized bed agglomeration. Dairy Science and Technology. 93(4-5):523-535. doi:10.1007/s13594-013-0132-7S523535934-5Banjac M, Stakic M, Voronjec D (1998) Kinetics of agglomeration of milk powder in a vibro-fluidized bed. Proc. 11th International Drying Symposium (IDS'98), B: 998–1005.Banjac M, Stamenić M, Lečić M, Stakić M (2009) Size distribution of agglomerates of milk powder in wet granulation process in a vibro-fluidized bed. Brazilian J Chem Eng 26:515–525Dewettinck K, Deroo L, Messens W, Huyghebaert A (1998) Agglomeration tendency during top-spray fluidized bed coating with gums. Lebensm Wiss Technol 31:576–584Forny L, Marabi A, Palzer S (2011) Wetting, disintegration and dissolution of agglomerated water soluble powders. Powder Technol 206:72–78Fries L, Dosta M, Antonyuk S, Heinrich S, Palzer S (2010) Moisture distribution in fluidized beds with liquid injection. Proc. 17th International Drying Symposium (IDS 2010), Magdeburg, Germany.Heinrich S, Blumschein J, Henneberg M, Ihlow M, Mörl L (2003) Study of dynamic multidimensional temperature and concentration distributions in liquid-sprayed fluidized beds. Chem Eng Sci 58:5135–5160Jimenez T (2007) Agglomération de particules par voie humide en lit fluidisé [Wet fluidized bed agglomeration of particles]. PhD, ENSIA, Massy, France.Jimenez T, Turchiuli C, Dumoulin E (2006) Particles agglomeration in a conical fluidized bed in relation with air temperature profiles. Chem Eng Sci 61:5954–5961Kim EH-J, Dong Chen X, Pearce D (2009) Surface composition of industrial spray-dried milk powder. J Food Eng 94:169–181Koga S, Kobayashi T, Inoue I (1989) Drying and agglomeration of skim milk powder by a vibro-fluidized bed, heat transfer. Japan Res 18:1–8Maronga SJ, Wnukowski P (1997) Establishing temperature and humidity profiles in fluidized bed particulate coating. Powder Technol 94:181–185Maronga SJ, Wnukowski P (1998) The use of humidity and temperature profiles in optimizing the size of fluidized bed in a coating process. Chem Eng Sci 37:423–432Murrieta-Pazos I, Gaiani C, Galet L, Cuq B, Desobry S, Scher J (2011) Comparative study of particle structure evolution during water sorption: skim and whole milk powders. Coll and Surf B Biointerfaces 87:1–10Neff E, Morris HAL (1968) Agglomeration of milk powder and its influence on reconstitution properties. J Dairy Sci 51:330–338Niskanen T, Yliruusi J, Niskanen M, Kontro O (1990) Granulation of potassium chloride in instrumented fluidized bed granulator—part I: effect of flow rate. Acta Pharm Fenn 99:13–22Palzer S (2011) Agglomeration of pharmaceutical, detergent, chemical and food powders—similarities and differences of materials and processes. Powder Technol 206:2–17Saad MM, Barkouti A, Rondet E, Ruiz T, Cuq B (2011) Study of agglomeration mechanisms of food powders: application to durum wheat semolina. Powder Technol 208:399–408Turchiuli C, Smail R, Dumoulin E (2012) Fluidized bed agglomeration of skim milk powder: analysis of sampling for the follow-up of agglomerate growth. Powder Technol 238:161–168Vuataz G (2002) The phase diagram of milk: a new tool for optimizing the drying process. Lait 82:485–500Waldie B, Wilkinson D, Zachra L (1987) Kinetics and mechanisms of growth in batch and continuous fluidized bed granulation. Chem Eng Sci 42:653–66

On the effect of ultrasound-assisted atmospheric freeze-drying on the antioxidant properties of eggplant

[EN] The low operating temperatures employed in atmospheric freeze-drying permits an effective drying of heat sensitive products, without any impairment of their quality attributes. When using power ultrasound, the drying rate can be increased, thus reducing the process duration. However, ultrasound can also affect the product quality. The aim of this study was to evaluate the effect of various drying process variables, namely air temperature and velocity, ultrasound power and sample size, on the antioxidant properties of eggplant (Solanum Melongena L.) samples. For this reason, drying experiments were carried out at different drying temperatures (-5, -7.5, -10 °C), power ultrasound levels (0, 25, 50 W; 21.9 kHz) and air velocities (2, 5 m s-1) using different sample sizes (8.8 mm and 17.6 mm cube side). The ascorbic acid content (Jagota and Dani method), total phenolic content (Folin-Ciocalteau method), and the antioxidant capacity (FRAP method) of the dried products were considered as quality indicators of the dried samples. The increase in air velocity and temperature, as well as the sample size, significantly reduced the antioxidant potential of the dried samples (p-value < 0.05). For a given sample size, the application of ultrasound, at the acoustic power levels tested, did not produce significant effects on the antioxidant indicators considered. Temperature measurements inside the drying sample showed a non-negligible temperature rise when acoustic power was applied.The authors acknowledge the financial support from Generalitat Valenciana (PROMETEOII/2014/005) and INIA-ERDF (RTA2015-00060-C04-02).Colucci, D.; Fisore, D.; Rosselló, C.; Carcel Carrión, JA. (2018). On the effect of ultrasound-assisted atmospheric freeze-drying on the antioxidant properties of eggplant. Food Research International. 106:580-588. https://doi.org/10.1016/j.foodres.2018.01.022S58058810

OFFSET EVALUATION OF THE ECUADORIAN VERTICAL DATUM RELATED TO THE IHRS

Considering the definition of the International Height Reference System (IHRS) in the geopotential space (Resolution 1/2015, International Association of Geodesy - IAG), among the present main objectives of the international geodetic community is the materialization of IHRS around the world. One fundamental task for this is the offset determination of each national vertical datum related to the IHRS. In this manuscript we establish the relationship between the Ecuadorian Vertical Datum (EVD) and the IHRS in the geopotential space following the foundations of the Resolution 1/2015 IAG. Gravity data, heights from the Ecuadorian Fundamental Vertical Network, Global Geopotential Models and Digital Elevation Models were used in the computations. Based on the Least Squares Collocation method, empirical covariance functions and spectral decomposition techniques, we realized the modelling of the geopotential in the study region (4° x 4° centered in the La Libertad tide gauge, Ecuador). Based on the referred approaches, we solved the free Geodetic Boundary Value Problem for determining the discrepancy of the EVD related to the IHRS. An offset of approximately 29 cm ± 3 cm was estimated for the W0 - W0i relation when the GO_CONS_GCF_2_DIR_R5 model was used in the modeling of the medium and long wavelengths of the terrestrial gravity field, and approximately 43 cm ± 3 cm when the EIGEN6C4 model was used