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Nomenclatura Unesco > (23) Química

Mostrando recursos 201 - 220 de 41,018

201. Salt determination in salted bovine hide - Morera Prat, Josep Maria; Soler Solé, Jaume; Saborit, Mercè
In this work, a simple and inexpensive method has been developed to determine the amount of salt contained in a salted raw hide. Two different systems of analysis have been tested. In both methods, salt is removed by stirring the hide with deionized water and analysing the resulting salt bath. The first method is based on the measurement of the chloride amount in the salt bath by the Mohr method. The second method is based on measuring the density of the salt bath. The second method has yielded very good results. Also, it does not require the use of chemical...

202. Biofilm dynamics characterization using a novel DO-MEA sensor: mass transport and biokinetics - Guimerà Villalba, Xavier; Moya, Ana; Dorado Castaño, Antonio David; Villa, Rosa; Gabriel, David; Gabriel, Gemma; Gamisans Noguera, Javier
Biodegradation process modeling is an essential tool for the optimization of biotechnologies related to gaseous pollutant treatment. In these technologies, the predominant role of biofilm, particularly under conditions of no mass transfer limitations, results in a need to determine what processes are occurring within the same. By measuring the interior of the biofilms, an increased knowledge of mass transport and biodegradation processes may be attained. This information is useful in order to develop more reliable models that take biofilm heterogeneity into account. In this study, a new methodology, based on a novel dissolved oxygen (DO) and mass transport microelectronic array...

203. Conversion of chemical scrubbers to biotrickling filters for VOCs and H2S treatment at low contact times - Santos, Alfredo; Guimerà Villalba, Xavier; Dorado Castaño, Antonio David; Gamisans Noguera, Javier; Gabriel, David
The purpose of this work was to evaluate the technical and economical feasibility of converting three chemical scrubbers in series to biotrickling filters (BTFs) for the simultaneous removal of H2S and volatile organic compounds (VOCs). The conversion of the full-scale scrubbers was based on previous conversion protocols. Conversion mainly required replacing the original carrier material and recycle pumps as well as modifying the controls and operation of the reactors. Complete removal of H2S and VOCs on a routine basis was reached at neutral pH in a longer period of time compared to previous conversions reported. Biotrickling filters operated at a...

204. Efecto de las variables de proceso de inyección sobre la morfología de la espuma microcelular de PET-glicolizado - Sica, Kristy; Sánchez Soto, Miguel; Candal, María Virginia
La presente publicación comprende el estudio del efecto de las variables de proceso de inyección sobre la morfología obtenida al espumar Polientilentereftalato glicolizado (PETG) con un agente espumante químico endotérmico. La morfología fue estudiada mediante Microscopía Electrónica de Barrido (SEM). Se pudo observar que a medida que la relación gas/polímero se incrementa, la densidad celular de la espuma de PETG aumenta. A medida que la velocidad de inyección se incrementa, la densidad celular aumenta hasta llegar a un comportamiento asintótico. Por último, se encontró que el factor que genera un mayor efecto es la temperatura del molde, la cual al ser incrementada, genera...

205. Grey water reclamation by decentralized MBR prototype - Santasmasas Rubiralta, Carme; Rovira Boixaderas, Miquel; Clarens Blanco, Frederic; Valderrama Angel, César Alberto
Grey water treatment and reuse for non-drinking water requirements has become of great interest in arid and semi-arid zones where water resources are becoming both quantitatively and qualitatively scarce. In this study a decentralized and automatic MBR prototype has been designed and installed in the REMOSA facilities for treatment of low-load grey water to be recycled in flushing-toilet application. The recycling treatment of grey water comprises four stages: screening, biological oxidation, filtration and a final disinfection by chlorination. The influent and effluent were monitored in order to determine the treatment efficiency and assessment of the quality potential of treated grey...

206. Cosmetotextiles with gallic acid: skin reservoir effect - Marti Gelabert, Meritxell; Alonso Merino, Cristina; Martínez Rodríguez, Vanessa; Lis Arias, Manuel José; de la Maza, Alfons; Parra Juez, José Luis; Coderch Negra, Luisa
The antioxidant gallic acid (GA) has been incorporated into cotton (CO) and polyamide (PA) through two different vehicles, that is, liposomes and mixed micelles, and their respective absorption/desorption processes have been studied. Moreover, in vitro percutaneous absorption tests of different cosmetotextiles have been performed to demonstrate antioxidant penetration within the layers of the skin. When GA was embedded into the cosmetotextiles, it always promoted a reservoir effect that was much more marked than that observed for polyamide. Similar penetration was observed in the textiles treated with GA in mixed micelles or liposomes in such compartments of the skin as the...

207. Determination of chemical oxygen demand in heterogeneous solid or semisolid samples using a novel method combining solid dilutions as a preparation step followed by optimized closed reflux and colorimetric measurement - Noguerol Arias, Joan; Rodríguez-Abalde, Ángela; Romero, Eva; Flotats Ripoll, Xavier
This paper reports the development of an innovative sample preparation method for the determination of the chemical oxygen demand (COD) in heterogeneous solid or semisolid samples, with high suspended solids and COD concentrations, using an optimized closed re flux colorimetric method.

208. Comportamiento a fractura de láminas de espuma de polipropileno producidas mediante dos métodos diferentes de espumación - Arencón Osuna, David; Sousa Pais Antunes, Marcelo de; Martínez Benasat, Antonio; Velasco Perero, José Ignacio
Dos tipos de espumas flexibles de baja densidad . basadas en polipropileno y producidas por dos métodos diferentes de espumación (espumación física y espumación química) .se han caracterizado utilizando el concepto del trabajo esencial de fractura (EWF), con particular atención a la influencia de la densidad relativa de la espuma y a su estructura celular en los valores de los parámetros característicos. Se ha propuesto un procedimiento de corrección basado en la relación de expansión de la espuma y en la estructura celular, con el objetivo de tener en cuenta su complejidad estructural en los parámetros de fractura . Se...

209. Incorporation de nanoparticules métalliques dans une membrane de filtration pour la réduction catalytique de composés organiques - Emin, Clelia; Macanás de Benito, Jorge; Lahitte, Jean-François
En raison de leurs grandes surfaces spécifiques les nanoparticules métalliques (N PM) possèdent des propriétés physico-chimiques uniques par rapport à la forme macroscopique du même matériau, en particulier en matière de réactivité catalytique. Afin de conserver ces spécificités, il est important de maitriser leur stabilité en évitant leur agrégation. La synthèse in situ, dite inter-matricielle, de NPM au sein d’une matrice polymère permet de les stabiliser sans perte de réactivité tout en conservant leurs propriétés catalytiques élevées. En utilisant cette stratégie de synthèse, nous avons développé des réacteurs membranaires catalytiques (RM C) contenant des NPM permettant ainsi de réaliser une...

210. Nanotechnology for detection of biomolecules and fabrication of bioactives platforms - Alemán Llansó, Carlos; Pérez Madrigal, Maria del Mar; Fabregat Jové, Georgina; Armelín Diggroc, Elaine Aparecida
Postprint (published version)

211. Intermatrix synthesis: easy technique permitting preparation of polymer-stabilized nanoparticles with desired composition and structure - Ruiz Nicolás, Patricia; Macanás de Benito, Jorge; Muñoz Tapia, Maria; Muraviev, Dmitri N.
The synthesis of polymer-stabilized nanoparticles (PSNPs) can be successfully carried out using intermatrix synthesis (IMS) technique, which consists in sequential loading of the functional groups of a polymer with the desired metal ions followed by nanoparticles (NPs) formation stage. After each metal-loading-NPs-formation cycle, the functional groups of the polymer appear to be regenerated. This allows for repeating the cycles to increase the NPs content or to obtain NPs with different structures and compositions (e.g. core-shell or core-sandwich). This article reports the results on the further development of the IMS technique. The formation of NPs has been shown to proceed by...

212. El puzzle como actividad de evaluación en el aula en grupos numerosos - Cadenato Matia, Ana María; Martínez Martínez, María del Rosario
La presente comunicación expone cómo se ha utilizado la técnica del puzle como actividad de evaluación en el aula con el doble objetivo de realizar una evaluación continua e introducir la competencia de l trabajo en equipo en grupos numerosos. La experiencia se ha venido desarrollando desde el curso 2007-08 en dos asignaturas troncales, Química I y Termodinámica, de la titulación de Ingeniería Industrial, en la Escuela Técnica Superior de Ingeniería I ndustrial de Barcelona, de la Universidad Politécnica de Cataluña (ETSEIB-UPC). Esta técnica, al igual que todas las de ap rendizaje cooperativo, transfiere parte de la responsabilidad del aprendizaje al alumnado, que es uno de los principales objetivos del cambio a que aspira la...

213. Langmuir and Langmuir-Blodgett films of a calix[7]arene ester - Torrent Burgués, Juan; Vocanson, Francis
Postprint (published version)

214. Use of sorbents in air quality control systems - Gallego Piñol, Eva; Roca Mussons, Francisco Javier; Perales Lorente, José Francisco; Guardino Solà, Xavier
Sorbent based methods have been successfully used in the collection of air samples to determine air quality. The complexity of the occurrence in air samples of several compounds in terms of composition (polar to non-polar compounds, very volatile to semi-volatile compounds) and abundance (below detection limit to over detector saturation limit) are topics that have to be taken into account when analytical methods are developed, especially in terms of sorbent choosing. An important amount of compounds found in air (eg. volatile organic compounds (VOC), volatile sulphur compounds (VSC) and polycyclic aromatic hydrocarbons (PAH)) generate odour problems, have associated R-phrases, are ozone...

215. Activitats de difusió científica i tecnològica de l'ETSEIB: "Separació i identificació dels colorants del recobriment de caramels de xocolata" - Rodríguez Galán, Rafael Alfonso; Urpí Garriga, Lourdes
És una pràctica de laboratori químic que forma part d'un conjunt d'activitats que l'ETSEIB oferta als instituts de secundaria. La finalitat és que els estudiants de batxillerat coneguin l'ETSEIB a la vegada que completen la seva formació

216. 8502-15 LABORATORIO DE QUIMICA ORGANICA - Avila, Ayl??n
Material de estudio para alumnos de 5?? a??o, ??rea Laboratorio de Qu??mica Org??nica.

217. 8002-15 OLIMPIADAS DE QUIMICA - Nivel II - Avila, Ayl??n
Material de estudio para alumnos de 5?? a??o, ??rea Olimp??adas de Qu??mica.

218. 8402-15 QUIMICA Reacciones en Qu??mica Org??nica - Avila, Ayl??n
Material de estudio para alumnos de 4?? a??o, ??rea Qu??mica III.

219. 8401-15 QUIMICA Introduccion a la quimica organica - Caccia, Rodolfo; Soldani, Marcelo; Avila, Ayl??n
Material de estudio para alumnos de 4?? a??o, ??rea Qu??mica III.

220. 8001-15 OLIMPIADAS DE QUIMICA - Nivel I - Avila, Ayl??n
Material de estudio para alumnos de 4?? a??o, ??rea Olimp??adas de Qu??mica.


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