Search results for " Tecnología"

Radiation model of a TiO2-coated, quartz wool, packed-bed photocatalytic reactor

2010

The radiation field of a packed-bed photocatalytic reactor filled with quartz wool coated with titanium dioxide was modeled using the Monte Carlo technique and the following information: the radiation flux emitted by the lamps, the diameter size distribution of the quartz fiber cloth, the mass of quartz fibers and of TiO2 that was immobilized on the fiber surface as well as the refractive index and the spectral absorption coefficient of the materials of the system. Modeling predictions were validated with radiometer measurements of the transmitted radiation through the reactor, the root mean square error being < 9.7%. Finally, by means of a parametric study, the validated model was used to …

Prensa Electrónica : el Futuro

1982

Order-Order Phase Transitions Induced by Supercritical Carbon Dioxide in Triblock Copolymer Thin Films

2019

We study the influence of supercritical carbon dioxide (scCO2) on the phase behavior of a cylinder-forming polystyrene-block-polybutadiene-b-polystyrenetriblock copolymer thin film. Solvent annealing with scCO2 can produce patterns with long-range order but these structures become unstable for thin films with small thicknesses. These results are in good agreement with self-consistent mean field calculations, which indicate that a drying transition occurs for thicknesses below the radius of gyration of the molecule.After decompression and solvent extraction, the initially swollen polymer nanostructure suffers a strong reduction in the average domain spacing, which has a deleterious effect on…

Ingeniería humana: alterando el cuerpo para ampliar la fantasía moral. Una posible solución a los problemas planteados por Günther Anders

2017

&lt;p align="JUSTIFY"&gt;&lt;span style="font-family: 'Times New Roman', serif;"&gt;&lt;span style="font-size: medium;"&gt;En el presente trabajo exploraremos la hipótesis de que el uso de sustancias psicodélicas pueda ampliar nuestras facultades de representación y, por ende, nuestras facultades morales. De este modo, recogeremos el testigo que Günther Anders nos tiende en &lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: 'Times New Roman', serif;"&gt;&lt;span style="font-size: medium;"&gt;&lt;em&gt;La obsolescencia del hombre&lt;/em&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style="font-family: 'Times New Roman', serif;"&gt;&lt;span style="font-size: medium;"&gt;, cuando señala que “en la…

Photoluminescence Enhancement of CdSe Quantum Dots: A Case of Organogel–Nanoparticle Symbiosis

2012

Highly fluorescent organogels (QD-organogel), prepared by combining a pseudopeptidic macrocycle and different types of CdSe quantum dots (QDs), have been characterized using a battery of optical and microscopic techniques. The results indicate that the presence of the QDs not only does not disrupt the supramolecular organization of the internal fibrillar network of the organogel to a significant extent, but it also decreases the critical concentration of gelator needed to form stable and thermoreversible organogels. Regarding the photophysical properties of the QDs, different trends were observed depending on the presence of a ZnS inorganic shell around the CdSe core. Thus, while the core-s…

Gigantes ecónomicos, enanos políticos

1999

Meat quality of commercial chickens reared in different production systems: industrial, range and organic

2020

Abstract Meat is an important part of the human diet since it provides several nutrients. However, the amount of these nutrients can differ according to several factors. With this in mind, the present research was designed with the main objective of evaluating the effect of production system of broiler chickens (industrial, range and organic) on meat quality. The physicochemical, chemical and nutritional characteristics were determined in breast and drumstick meat. The organic chickens presented the lowest amounts of fat and cholesterol and the highest amounts of protein. The colour was also influenced by the production system, where organic and range chickens had the highest values of redn…

Active properties of edible marine polysaccharide-based coatings containing Larrea nitida polyphenols enriched extract.

2020

The aim of this work was to develop active edible coatings based on marine polysaccharide matrices and polyphenols-enriched native plant extracts from arid and semiarid regions of Argentina. Initially, five plant extracts were characterized in terms of antioxidant, antibacterial and antiviral activity and the one with better biological properties and no toxicity or genotoxicity, Larrea nitida (Ln) extract, was incorporated into agar, alginate or agar/alginate matrices. The Ln extract-containing films were characterized in terms of physicochemical and polyphenols release performance in food simulants. The incorporation of Ln extract provided darker films, with a more saturated orange-brownis…

Non-linear System Identification with Composite Relevance Vector Machines

2007

Nonlinear system identification based on relevance vector machines (RVMs) has been traditionally addressed by stacking the input and/or output regressors and then performing standard RVM regression. This letter introduces a full family of composite kernels in order to integrate the input and output information in the mapping function efficiently and hence generalize the standard approach. An improved trade-off between accuracy and sparsity is obtained in several benchmark problems. Also, the RVM yields confidence intervals for the predictions, and it is less sensitive to free parameter selection. Teoría de la Señal y Comunicaciones

Carbon efficiency analysis in the provision of drinking water : Estimation of optimal greenhouse gas emissions

2023

Producción Científica