11 research outputs found
Study of the thermal properties of Acrylonitrile Butadiene Styrene - High Impact Polystyrene blends with Styrene Ethylene Butylene Styrene
[EN] A binary blend Acrylonitrile Butadiene Styrene ¿ High Impact Polystyrene (ABS-HIPS 50% wt) was prepared on a twin-screw extruder at 190-210 oC. The different properties were then analyzed using melt flow index (MFI), thermogravimetric analysis (TGA), and Fourier Transform Infrared spectroscopy (FTIR). FTIR analysis indicated heterogeneous distribution of the blend in injected pieces and SEM micrographs show heterogeneous distribution of both phase (ABS and HIPS). On the other hand, we have prepared ternary blends of ABS-HIPS-Styrene Ethylene Butylene Styrene (SEBS), varying the percentage of SEBS from 10 to 30 %wt using a twin screw extruder at 190-210oC. The addition of SEBS to the binary system (ABS-HIPS) allowed us to increase the ductile properties as well as reducing the viscosity.We would like to thank the Vice-Directorate of Research, Development and Innovation of the Polytechnic University of Valencia for the help granted to the project: “Ternary systems research applied to polymeric materials for the upgrading of waste styrene”, Ref: 20091056 within the program of First Projects of Investigation (PAID 06-09) where this work is framed.Peydro Rasero, MÁ.; Juárez Varón, D.; Sánchez Caballero, S.; Parres, F. (2013). Study of the thermal properties of Acrylonitrile Butadiene Styrene - High Impact Polystyrene blends with Styrene Ethylene Butylene Styrene. Annals of The University of Oradea. XXII(1):273-276. http://hdl.handle.net/10251/35953S273276XXII
Liquid chromatographic method for determination of chloridazon in technical concentrates and formulated products: comparison with CIPAC method
A liquid chromatographic method for determination of chloridazon in technical concentrates and formulated products has been developed and compared with the present CIPAC method. The new method uses the same procedures and reagents as does the CIPAC method, but a microbore column and a diode array detector are used instead of a normal-phase column and a single wavelength detector. A technical product, a wettable powder, and a suspension concentrate were analyzed by both methods; the results (g chloridazon/kg) were 836.7 ± 6.3 (RSDr 1.05%) and 822.1 ± 8.2 (RSDr 1.39%); 648.7 ± 7.6 (RSDr 1.64%) and 641.1 ± 6.7 (RSDr 1.45%); and 350.5 ± 5.6 (RSDr 2.24%) and 351.1 ± 4.0 (RSDr 1.57%) by the CIPAC method and the new method, respectively. Although precision, accuracy, and resolution are very similar for the 2 methods, the microbore column, diode array detector, and multichannel integrator specified in the new method give more information on the integration process and on the purity of peaks, and save on operating costs. Therefore, the authors propose that CIPAC methodology use this type of apparatus as soon as it is more generally available in laboratories
Multifunctional Iridium-Zr-MOF for N-alkylation of amines with alcohols and hydrogenation of arenes
Poster presented at the XXXII Conference GEQO, which is organised by the expert group meeting on organometallic chemistry, held in Tarragona (Spain) on September 17-19th, 2014.[Work hypothesis and objective] Zr-based MOF(UiO66-NH2) has a large specific surface area and pore size as well as good chemical resistance to water and organic solvents, which result in desirable properties for catalytic applications. This highly stable material was selected as support. We have developed a simple and efficient method for new readily recoverable hybrid catalyst that combines the catalytic activity of transition-metal complexes with the architecture of metal organic frameworks (MOFs) and their application for cascade reactions [1], N-akylation of alcohols [2] and hydrogenation of arenes [3].[Results] In the tested reactions, UiO-66-LIr can be recovered by simple filtration in air and reused without significant loss of catalytic activity, at least after 5 cycles while framework structures are maintained.The authors thank the MINECO of Spain (Projects MAT2011-29020-C02-02 and Consolider Ingenio 2010-MULTICAT.Peer Reviewe
Postsynthetic metal exchange of Ti(IV) into a series of mixed ligand UiO-MOFs: study of their catalytic applications
Poster presented at the 1st European Conference on Metal Organic Frameworks and Porous Polymers, held on October 11-14th, 2015, Potsdam (Germany).Herein, we report mixed-ligand, mixed-metal highly porous UiO-derivatives (UiO = University of Oslo) obtained by postsynthetic metal exchange (PSE)1. Ti atoms were embedded into the Zr-cluster of UiOs (Zr6O4(OH)4) by treatment with TiCl4(THF)2, obtaining up to 50% atom exchanged. After PSE, the crystallinity and morphology of the UiO-materials were maintained, indicating that Zr-Ti exchange did not alter the structural properties of the MOFs. Post-functionalized MOFs have demonstrated attractive properties for catalytic applications2. Herein Zr- and ZrTi-UiO-MOFs have been applied as catalysts for the isomerization of -pinene epoxide and citronellal. High conversions and good selectivities were obtained for both substrates (70 and 80% respectively in 24 hours).
The presence of Ti into the catalyst improves the reactivity obtaining higher conversions, particularly in the case of citronellal, while the presence of NH2 group has minor effect on the reactions.Consolider Ingenio (CSD2009-0050, MULTICAT), MAT2011-29020-C02-02
Dissipation of racemic mecoprop and dichlorprop and their pure R- enantiomers in three calcareous soils with and without peat addition
Two racemic herbicides, mecoprop (R,S-MCPP) and dichlorprop (R,S-DCPP), as well as their enantiopure R-forms, were incubated in three calcareous soils at 15°C and 80% of their field capacity to try to elucidate their behaviour in soil and compare the dissipation rates when racemic and enantiopure compounds are used. Quantitation of pesticides is made by HPLC and the R/S ratio by GC-MS. The inactive S-enantiomer from the racemic forms persists longer than the R-forms in silt and sandy loam soils, but for shorter time in the clay loam soil. The pure R-enantiomers, both for MCPP and DCPP, after incubation in soil, are partially converted into their S-forms. In all cases, the dissipation of racemic and pure enatiomeric forms is lower in the clay loam soil than in the silt and sandy loam soils. The R-forms' peristence, in the three soils, is approximately two times lower when they are incubated alone than when they are incubated as racemic compounds. When peat is added, the persistence of these herbicides in the silt and sandy loam soils increases, while in the clay loam soil it decreases. Besides, in the clay loam soil, the enantiomeric ratio (ER) changes from its S-preferential degradation to a preferential degradation of its R-form, so an increase in the persistence of the inactive S-form occurs. (C) 2000 Elsevier Science Ltd.Peer Reviewe
Cephalopod biology and fisheries in Europe
181 pagesOver the past two decades, cephalopod molluscs have attracted increased attention from marine biologists and fishery scientists. Several species are important for European fisheries, as targets of small‐scale coastal fisheries and/or as bycatch in multispecies fisheries for demersal fish. The present report draws on a series of reviews prepared in 2005 for the CEPHSTOCK project (see Section 1). The taxonomy of the main resource species is reviewed (Section 2), and brief descriptions of each species are provided, along with information from studies of population genetics, habitat requirements of paralarvae and adults, and health and ecotoxicology (Section 3). The main fisheries are described, including illustration of gears used in specialized small‐scale fisheries and a discussion of the socio-economic importance of the fisheries. The current status of cephalopod aquaculture is reviewed, highlighting notable advances in commercial culture of octopus and cuttlefish (Section 4). Current fishery data collection and fishery management are described, noting that there is no setting of landings quotas and no routine assessment of stock status. Optns for stock assessment are discussed, drawing on one off assessments made during specific projects and current practice elsewhere in the world. The “live fast, die yong” lifehistory strategies of cephalopods present particular challenges, buparallels can be drawn with shortlived fish (Section 5). Finally, the report looks to the future, reviewing possible effects of climate change on cephalopods. It discusses the future development of aquaculture and fisheries for cephalopods, including prospects for fishery forecasting and fishery management - especially in relation to the small-scale directed fisheries. Various knowledge gaps are identified, and ideas for research to fill these gaps are presentedMuch of the material presented in this report was originally compiled for the report of the CEPHSTOCK project (Q5CA‐2002‐00962, 2002 - 2005). We thank all the project participants for their input. GJP acknowledges support from the EU during the editing of this report, through the ANIMATE project (MEXC‐CT‐2006‐042337)Peer reviewe
Determination of carbetamide in groundwater by micro liquid-liquid extraction and gas chromatography-mass spectrometry
First evidence of a new spawning stock of Illex coindetii in the North Sea (NE-Atlantic)
Assessing the use of sand, peat soil, and pine bark for the attenuation of polar pesticides from agricultural run-off: a bench-scale column experiment
Suelo y planta. Índices. Volumen 1
Compostaje de la fracción orgánica de un residuo sólido urbano. Evolución de su contenido en diversas fracciones de metales pesados, C. García, T. Hernández, F. Costa y M. Ayuso.-- Decomposition of chromium containing leather residues in a Sandy soil, A. Benedetti, B. Ceccanti, M. Calcinai and R. Tarsitano.-- Aluminum tolerance assessment in Bush vean cultivars by root growth analysis anto hematoxylin standing, N. Massot, Ch. Poschenrieder and J. Barceló.-- Utilización del test de la formamida en la identificacion de los filosilicatos l:l de suelos de la provincia de la Coruña
R. Romero, C. García y F. Macías.-- Efecto del encalado y de la fertilización con fosforo sobre las formas de acidez de dos suelos ácidos de Galicia M. M. Urrutia, E. García-Rodeja y F. Macías.-- Sobre el clima de la provincia de Almeria (se iberico): primer ensayo de cartografia automatica de medias anuales de temperatura y precipitación, R. Lázaro y J. M. Rey.-- Vitrifica tion and ba-induced anomalies in in vitro chestnut cultures, A. Ballester, M. C. San-José and A. M. Vieitez.-- Phenmedipham inhibition of biological nitrogen fixation in pea plants, S. Treleani, E. Bedmar, J. J. Lázaro, A. Chueca and J. López Gorge.-- morphometry and surface growth dynamics of the sunflower. (helianthus annuus l.) receptacle its importance in the determination of yield, L. F. Hernández.-- Acumulación de nitratos y actividad nitrato reductasa en diferentes cultivares de vicia faba l., J. M. Caba, C. Lluch, A. Hervás y F. Ligero.-- Desarrollo vegetativo, acumulación y distribución de a-, na+ y k+ en dos patrones de limonero, M. Nieves, A. Cerdá y S. Navarro.-- Incidencia de la fertilizacion foliar de quelatos de hierro y micronutrientes en los niveles de n, p, k, ca, mg y na en hojas de "vitis vinifera" cv. Aledo, J. Navarro, J. Mataix, J. Sánchez-Andreu y M. Juárez.-- Estimacion de la movilidad potencial de la arcilla mediante electroultrafiltracion y su importancia en genesis de suelos R. J. Ballesta, y J. A. Díez.-- Exchange processes in two soils subjected to different organic treatments, C. Fortún and A. Fortún.-- Respuesta del trigo a las aplicaciones parciales de nitrogeno cultivado durante tres años bajo condiciones semiáridas, G. C. Laurent y M. A. Lazzari.-- Destino del 15N del fertilizante aplicado al trigo durante dos años consecutivos en condiciones semiáridas, M. A. Lazzari, G. C. Laurent y R. L. Victoria.-- Estudio con trazador sobre la disponibilidad del nitrógeno residual M. A. Lazzari, G. C. Laurent y R. L. Victoria.-- Factores condicionantes del encalado en los ultisoles del oeste de España, R. Espejo, E. Barragán, M. C. Díaz y J. Pérez.-- Influencia de la dosis de fosforo en la disolución de riego sobre cultivo de tomate en enarenado y condiciones salinas A. Masaguer, C. Cadahía, A. Saá y M. J. Sarro.-- Influencia del manganeso y diferentes temperaturas ambientales sobre el crecimiento y absorción de manganeso en soja (Glycine_ max (L.) Merr.) J. M. Romera y M. Gómez.-- Perfiles ecotoxicologicos: la necesidad de su realización, E. Laborda, F. A. Antón y L. M. Cuadra.-- Adsorción de carbendazima, cianazina y etirimol por suelos, G. Dios, E. Romero y F. Sánchez-Rasero.-- Micorrizas vesiculo-arbusculares en austrocedrus chilensis, S. Fontenla, M. Havrylenko y P. H. Rosso.-- Determinación de capacidad de cambio catiónico y cationes extraíbles con agtiourea en andosoles, C. D. Arbelo, M. Espino y J. M. Hernández-Moreno.-- Caracterization of the humic fraction from a solio municipal waste during composting, C. García, T. Hernández, F. Costa and A. Polo.-- Sulfato desorbffile con fosfato en andosoles, V. Cubas, C. D. Arbelo y M. Espino.-- Paleoprocesos edaficos en superficies pliocuaternarias del centro de España, J. Benayas, L. Alcalá del Olmo B., F. Monturiol y A. Guerra.-- Fraccionamiento de cobalto en suelos, M. J. Graña, M. T. Barral, F. E. Guitián y F. Guitián.-- Evolución de las poblaciones de heterodera avenae (nema toda) y su efecto en el desarrollo y rendimiento de trigo en rotación y monocultivo, Mª D. Romero, A. Valdeolivas, C. Lacasta y A. Duce.-- Efecfos restrictivos de la fertilidad del suelo sobre la distribución de Cytisus multif/orus (L'Her) Sweer, J. M. Gómez, P. Galindo, V. Martínez, y M. A. Pérez.-- Dinámica del sistema radicular de dos genotipos de tomate en invernadero en riego por goteo sometidos a estrés salino, J. M. Abrisqueta, A. Hernánsaez, J. J. Alarcón y M. A. Lozano.-- Distribución de sales en una secuencia de suelos costeros de la bahía blanca (argentina), H. R. Krüger y N. Peineman.-- Evaluación cinética de la desorción de bases en suelos con carga permanente y variable. comparación con el método de la pasta saturada, C. D. Arbelo, J. M. Hernández-Moreno y J. E. García.-- Análisis de la interacción luz-forma de nutrición nitrogenada en plantas de tomate, P. Zornoza, I. Sanz y O. Carpena.-- Respuesta de algunos suelos de Galicia al aporte de un ácido fuerte, M. M. Urrutia, E. García-Rodeja y F. Macías.-- Estudio de la efectividad de fertilización foliar de uva de mesa, variedad aledo con micronutrientes quelatados a través del diagnóstico foliar y pecio lar J. Navarro, J. Sánchez Andréu, J. Mataix y M. Juárez.-- Características de suelos bajo sabinares albares sobre material calizo, J. González y M. A. Candas.-- Eficacia de quelatos de fe en un sistema de riego por goteo, A. Gárate y J. J. Lucena.-- Variaciones de la fracción orgánica durante el compost aje de lodos de depuradoras, M. A. Díaz-Burgos y A. Polo.-- Formas de cobre, niquel y cinc en horizontes . superficiales de suelos, M. J. Graña, M. T. Barral, F. E. Guitián y F. Guitián.-- Índices de contaminación por metales pesados en suelos de cultivo intensivo: aplicacion en la comarca de l'hort a (Valencia), M. F. Errecalde, R. Boluda, M. J. Lagarda y R. Farré.-- Estudio estadístico de las propiedades fÍsico-quimicas de luvisoles desarrollados sobre materiales calizos en valencia (España), Mª D. Soriano, R. Boluda, V. Pons y J. Sánchez.-- Grado de uniformidad de los materiales en suelos con horizontes texturalmente contrastados, R. J. Ballesta, V. Cala y R. García.-- Geographic information systems and remote sensing in land resources anal ysis and mangement
G. W. Petersen, G. A. Nielsen, and L. P. Wilding -- El laboreo de conservación como medida de control de la erosión, P. González, E. Fereres, J. V. Giráldez, Mª I. González de Quevedo y A. Laguna.-- Laboreo de conservación: tendencias y prioridades de investigación, J. L. Arrúe y. Mª V. López.-- Factores de escala en la medida de la erosión hídrica en suelos incendiados del nw de España, F. Díaz-Fierros, B. Soto, R. Pérez y E. Benito.-- Influencia de la cobertura vegetal y material original en las características del suelo. contribución a problemas de erosión J. Hernando, M. L. Palomar, M.T. de la Cruz y P. Jerez.-- La salinidad en el nuevo regadío de quinto (zaragoza), J. Herrero y A. Bercero.-- Translocaciones solidas en suelos con características sódicas en monegros- flumen (Huesca): procesos e implicaciones para el uso agrícola, J. Porta y R. Rodríguez-Ochoa.-- Degradacion física de los suelos de una zona de rañas de la provincia de Salamanca, F. lngelmo, S. Cuadrado, J. Hernández y A. lbáñez.-- Metales extraffiles (cu, co, ni, zn y mn) en materiales estériles de minas de lignito de Galicia, S. Seoane, Mª V. González, F. Gil, Mª C. Leirós y F. Guitián Ojea.-- Contenido y evolución del plomo total en los inceptisoles de la provincia de Valencia, Y. Pons.-- Influencia del aporte sucesivo de compost urbano sobre la disponibilidad de k de un suelo, J. M. Murillo, F. Cabrera, J. M. Hernández y M. Barroso.-- Posible catena potencial de suelos en las sierras de Orce y Maria, L. J. Alías y J. Martínez.-- Caracterización mineralógica y evolución de las microtexturas de los granos de cuarzo en los suelos desarrollados sobre materiales arenosos del litoral de Cádiz, L. Torcal, M. Nieves y V. Gómez-Miguel.-- Clases mineralógicas: la clase "medial” en suelos graníticos de Galicia, R. Romero, C. García y F. Macías.-- Características analíticas de un suelo podsolizado de alta montaña, J. González y A. M. Moreno.-- Estudio de perfiles de alteración en abanicos aluviales neogenos sobre el zócalo hercinico ibeerico R. Espejo, E. Molina y M. A. Vicente.-Transformaciones mineralógicas en suelos sobre formaciones tipo "raña'' M. T. García-González y F. J. Aragoneses.-- Morfología y génesis de las terrazas antiguas de la cuenca del río Gualchos (Granada), C. Sierra, A. Roca y J. Quirantes.-- Dinámica del hierro y aluminio en las terrazas del río Gualchos (Granada), A. Roca, C. Sierra, J. Quirantes y J. Aguilar.- Homogeneidad/heterogeneidad de los materiales fluviales de las terrazas de río Tormes, P. Alonso, C. Dorronsoro, M. I. González, M. P. García, J. A. Egido y J. M. García.-- Transformaciones y translocaciones del fosforo como indicadores del desarrollo del suelo, C. RoblesPeer reviewe