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Adsorption of Pharmaceuticals and Personal Care Products on Granular Activated Carbon

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Journal of Surface Engineered Materials and Advanced Technology 2016年第4期6卷 183-200页

作者： Nasly Y. delgado Alberto L. Capparelli Damián J. Marino Agustín F. Navarro Gustavo A. Peñuela Alicia E. Ronco Centro de Investigaciones del Medio Ambiente Facultad de Ciencias Exactas Universidad Nacional de la Plata (UNLP) La Plata Argentina Consejo Nacional de Investigaciones Científicas y Técnicas La Plata Argentina División Fisicoquímica Facultad de Ciencias Exactas UNLP La Plata Argentina departamento de ingeniería Química Facultad de Ingeniería UNLP La Plata Argentina Grupo GDCON Universidad de Antioquia Medellín Colombia

We investigated the adsorption to granular activated carbon of two pharmaceuticals (carbamazepine and sildenafil citrate) and a personal-care product (methylparaben) in aqueous solution, characterized the carbon, and evaluated its influence on the kinetics and adsorption equilibrium of the compounds under study. We adjusted data for the analysis of equilibrium to Langmuir and Freundlich models of adsorption isotherms and described adsorption rate using pseudo first- and second-order models;that same analysis was made on the basis of the behavior of the initial rate. In addition, we analyzed the potentiality of a nonlinear adjustment for studying kinetics and equilibrium of adsorption, an approach requiring neither knowledge of equilibrium conditions nor a-priori hypothetical suppositions regarding the order of reaction. The results indicated that the nonlinear model was capable of describing adsorption kinetic behavior, in order to determine concentrations adsorbed at equilibrium, adsorption rates of the system, maximum adsorption capacity, and global rate constant. Granular carbon exhibited an adsorption capacity for carbamazepine and methylparaben of ca. 323 mg/g and for sildenafil citrate of ca. 142 mg/g, though with slow adsorption kinetics characterized by average adsorption times of at least 168 h.

关键词： Activated Carbon Carbamazepine Sildenafil Citrate Methylparaben Adsorption

Borane-Tetrahydrofurane Complex Reduction of Nickel and First Transition Metals in Tetrahydrofurane Media: Controllable Chemistry Leading to Nanoscale Metal and Metal Boride Particles

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Modern Research in Catalysis 2016年第1期5卷 19-30页

作者： delicia Acosta Elio E. Gonzo Hugo A. destéfanis Instituto de Investigaciones para la Industria Química—INIQUI-CONICET ANPCyT Consejo de Investigaciones— CIUNSa Facultad de Ingeniería—UNSa Buenos Aires Argentina

Nickel borides doped with transition metal (Cr, Mn, Fe, Co, Cu, and Zn) MNiB, 4% w/w respect to Ni were prepared by chemical reduction of nickel and metallic salts in methanol solution with borane-tetrahydrofurane (BH3-THF) complex obtained in aprotic solvent (THF anhydrous). Different techniques were used to characterize these materials. The MNiB amorphous structure was verified by XRD. Thermal treatment in N2 shows Ni°, Ni2 Band NiO phases. Spongy-morphology was evident by SEM studies in all cases. XPS and TEM show that doped and non-doped nickel boride was present as Ni° in metallic state as principal phase and nickel alloying with boron was observed in minor quantities. The oxidation stability, magnetic susceptibility and catalytic effect are correlated with parameters of each dopant metal.

关键词： NiB Doped NiB Borane-Tetrahydrofurane Reduction Catalyst

Influence of three aphid species used as prey on some biological aspects of the predator <i>Eriopis connexa</i>

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Open Journal of Animal Sciences 2013年第3期3卷 193-199页

作者： William Duarte Helber Arévalo Ingeborg Zenner de Polanía facultad de ingeniería Agronómica Universidad de Ciencias Aplicadas y Ambientales U.D.C.A. Bogotá D.C. Colombia

Up to now, the search for an efficient artificial diet to rear the predator Eriopis connexa, native to the Colombian highlands of Cundinamarca and Boyacá has been without success. Therefore, it is necessary to determine which of the available preys supply the best food for its development, survival and fertility. With this purpose, under controlled conditions, three aphid species, accessible within the natural habitat of the predator, were evaluated. The cabbage aphid (Brevicoryne brassicae) does not provide an adequate nutrition for the predator, and apparently, the glucosinolate content of this aphid is transferred and affecting the predator. Based on the demographic parameters such as net reproductive rate, finite reproduction rate, generational time and intrinsic growth rate, for three consecutive generations, it was determined that none of the other two aphid species can be considered either as optimum prey. Macrosiphum euphorbiae, as prey stands out over the alder aphid, Pterocallis sp., supplied as food. The influence that these three prey species had on the growth potential of the larval stages of the predator, under particular ambient conditions, is reported.

关键词： Predator Rearing Brevycoryne brassicae Macrosiphum Pterocallis sp. The Alder Aphid Glucosinolates

A Simple Two-Phase System Involving the Commercial Organophosphorous Extractant Cyanex 471x for the Preparation of Silver Sulphide Nanoparticles

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Materials Sciences and Applications 2012年第12期3卷 843-850页

作者： Rosa Lina Tovar-Tovar Octavio Domínguez-Espinós Adriana Gaona-Couto Azdrubal Lobo-Guerrero Salvador Palomares-Sánchez María Guadalupe Sánchez-Loredo Instituto de Metalurgia San Luis PotosíMéxico facultad de Ciencias San Luis PotosíMéxico facultad de ingeniería Univer-sidad Autónoma de San Luis PotosíSan Luis PotosíMéxico

The facile chemical synthesis of silver sulphide nanocrystals from metal-loaded organic media, containing a silver-selective organophosphorous ligand as extractant, is reported. The method involves the phase-transfer of silver species from aqueous nitrate media to organic solution using the commercial extractant Cyanex? 471x (tri-isobutylphosphine sulphide, Cytec Co.) as extractant, followed by precipitation stripping using ammonium sulphide as strip reagent. The nanoparticles were structurally characterized, and some aspects of the synthetical process, are briefly discussed. Under the conditions studied, the extractant Cyanex? 471x was able to act as stabilizer adsorbing on the particles surface, maintaining the size of the particles nanometrical.

关键词： Silver Sulphide Solvent Extraction Precipitation Stripping Cyanex 471x Tri-Isobutylphosphine Sulphide

Engineering of Fuel Plates on Uranium-Molybdenum Monolithic: Critical Issues

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World Journal of Nuclear Science and Technology 2015年第4期5卷 274-286页

作者： Jaime Lisboa Jorge Marin Mario Barrera Héctor Pesenti departamento de Materiales Nucleares Comisión Chilena de Energía Nuclear CCHEN Santiago Chile Instituto de Materiales Facultad de Ingeniería Universidad Austral de Chile Valdivia Chile

Engineering of nuclear fuels using monolithic plates of uranium-molybdenum and Al-6061 cladding is the current challenge for research and test reactors. The main drawback of the manufacture of monolithic nuclear fuel was analyzed using two surface coating methods: aluminum sputtering and transient liquid phase bonding (TLPB). Coating was done with a commercial alloy of Al-Si (R-4047). These techniques were used to improve the metallurgical bonding between the UMo and the cladding by rolling. Finally, design parameters and manufacture of UMo plate fuels were established. Mechanical tests were used to characterize the plates, resulting in UTS values of about 700 and 1000 MPa for the UMo alloys. These results are complemented with metrological analyses, X-Ray diffraction (XRD), thermal analyses, and metallography. X-rays and ultrasound scanners were used to monitor bonding and the co-rolling effects. These initial results show the main obstacles to the engineering development of UMo monolithic plate fuels with Al-6061 cladding, and these are discussed herein.

关键词： Metallurgic Bonding Co-Rolling Monolithic UMo Aluminum Alloy Nuclear Fuel

Flexibility and amplification measures in a supply chain model

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Flexibility and amplification measures in a supply chain mod...

Acoustic contamination assessment during the transition between the COVID-19 restrictions and reactivation:A exploratory analysis in Guayaquil

2008 IEEE International Conference on Communications(ICC 2008)

作者： Javier Pereira Luciano Ahumada Fernando Paredes facultad de ingenier’ a Universidad Diego Portales Avenida Eje’rcito 441SantiagoChile

Flexibility in a supply chain is usually conceived as a consequence of the amplification of production,typically known as the *** this article we modeled pull,push and hybrid inventory management methods,considering an AR（1） stationary stochastic demand *** show that for these cases,the production amplification results to be highly influenced by the flexibility policies implemented in the supply *** this context,we demonstrate that flexibility（measured by the adjustment capability between production and demand rates,and the ordering responsiveness） should be viewed as one of the main causes-and not a consequence-of the bullwhip *** is relevant for chain managers since controlling the flexibility of the chain will also let them control the *** also found an analytical relation between amplification and adjustment degree,showing that the amplification acceptability constraint introduced by Muramatsu can be accomplished by controlling the flexibility dimension described *** and strong flexibility conditions are *** show that the weak condition ultimately does not depend on the demand autocorrelation coefficient,whilst in the strong condition the ordering responsiveness,measured by lead time,may be modulable by the adjustment degree,both in push and hybrid ***,the supply chain manager is enabled to increase or decrease the lead time just increasing or decreasing the adjustment,respectively,always satisfying the Muramatsu criteria.

关键词： Supply chains Production Inventory management Stochastic processes delay Supply chain management demand forecasting Communications Society Autocorrelation Time measurement

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Geography and Sustainability 2023年第2期4卷 138-149页

作者： Andrés Velastegui-Montoya Geancarlo Guerrero-Cabrera Sandra Gonzalez-Camba Yadira Jaramillo-Lindao Ricardo Murillo-Portillo J.Hidalgo-Crespo Luis Encalada-Abarca Centro de Investigación y Proyectos Aplicados a las Ciencias de la Tierra(CIPAT) ESPOL Polytechnic UniversityP.O.Box 09-01-5863GuayaquilEcuador facultad de ingeniería en Ciencias de la Tierra(FICT) ESPOL Polytechnic UniversityP.O.Box 09-01-5863GuayaquilEcuador Geoscience Institute Federal University of Pará66075-110BelémBrazil facultad de Ciencias Naturales y Matemáticas(FCNM) ESPOL Polytechnic UniversityP.O.Box 09-01-5863GuayaquilEcuador Sciences pour la Conception l’Optimisation et la Production(G-SCOP)Centre National de la Recherche Scientifique(CNRS)UniversitéGrenoble Alpes38000GrenobleFrance facultad de ingeniería Industrial Universidad de Guayaquil090150GuayaquilEcuador Centre of Geographical Studies Institute of Geography and Spatial PlanningUniversity of Lisbon1600-276LisbonPortugal Universidad Espíritu Santo SamborondónEcuador

Noise pollution is becoming a critical health risk for city *** 2020,the COVID-19 pandemic forced many cities to implement several mobility *** restrictions changed human activity patterns and decreased the noise levels and noise pollution that often affect urban *** the number of infections decreased,so did the outdoor activities,influencing the population’s perception of *** paper aims to evaluate the changes in noise levels associated with mobility restrictions between 2020 and 2021 in Guayaquil,*** study used crowdsourcing with the help of smartphones and mobile applications to collect geo-referenced environmental noise *** data was used to generate noise maps in different time ***,noise level maps were created using GIS-based tools to identify the urban areas that experienced the highest noise level variation during the study *** results show that the most significant noise increase occurred at ***,when analyzing noise level changes in different urban areas,the western area of Guayaquil was the one that experienced the most significant noise level *** inform the perception of noise pollution and could potentially serve as a reference for decision-makers during the proposal of public policies that ensure a better quality of life for its citizens.

关键词： Acoustic contamination Crowdsourcing Data scrubbing Kriging Noise map

Fused empirical mode decomposition and wavelets for locating combined damage in a truss-type structure through vibration analysis

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第9期14卷 615-630页

作者： Arturo GARCIA-PEREZ Juan P. AMEZQUITA-SANCHEZ Aurelio DOMINGUEZ-GONZALEZ Ramin SEDAGHATI Roque OSORNIO-RIOS Rene J. ROMERO-TRONCOSO HSPdigital-CA Telematica-Procesamiento Digital de Se ales DICIS Universidad de Guanajuato Carr. Salamanca-Valle km 3.5+1.8 Palo Blanco 36885 Salamanca Gto. Mexico HSPdigital CA Mecatronica Facultad de Ingeniería Campus San Juan del Río Universidad Autonoma de Queretaro Moctezuma 249 Col. San Cayetano 76807 San Juan del Río Qro. Mexico department of Mechanical and Industrial Engineering Concordia University1455 de Maisonneuve Boulevard West Montreal QC H3G 1M8 Canada

Structural health monitoring (SHM) is a relevant topic for civil systems and involves the monitoring, data processing and interpretation to evaluate the condition of a structure, in order to detect damage. In real structures, two or more sites or types of damage can be present at the same time. It has been shown that one kind of damaged condition can interfere with the detection of another kind of damage, leading to an incorrect assessment about the structure condition. Identifying combined damage on structures still represents a challenge for condition monitoring, because the reliable identification of a combined damaged condition is a difficult task. Thus, this work presents a fusion of methodologies, where a single wavelet-packet and the empirical mode decomposition (EMD) method are combined with artificial neural networks (ANNs) for the automated and online identification-location of single or multiple-combined damage in a scaled model of a five-bay truss-type structure. Results showed that the proposed methodology is very efficient and reliable for identifying and locating the three kinds of damage, as well as their combinations. Therefore, this methodology could be applied to detection-location of damage in real truss-type structures, which would help to improve the characteristics and life span of real structures.

关键词： Truss structure Vibration Spectral analysis Wavelet packet transform Empirical mode decomposition Artificialneural network (ANN)

Reproductive performance of the Mesa silverside(Chirostoma jordani Woolman,1894)under natural and controlled photoperiods

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BIOCELL 2012年第3期36卷 105-111页

作者： JOSÉLUIS ARREDONDO-FIGUEROA LAURA GEORGINA NÚÑEZ-GARCÍA PALOMA ADRIANA HEREDIA-GUZMÁN JESÚS T.PONCE-PALAFOX Posta Zootécnica Departamento de ZootecniaCentro de Ciencias AgropecuariasUniversidad Autónoma de AguascalientesJesús MaríaAguascalientesMéxico Planta Experimental de Producción Acuícola Departamento de HidrobiologíaCBSUniversidad Autónoma Metropolitana IztapalapaMéxicoD.F facultad de Estudios Superiores Iztacala Universidad Nacional Autónoma de MéxicoEstado de MéxicoMéxico Centro de Innovación y Transferencia Tecnológica CENITT Posgrado CBAPEscuela Nacional de Ingeniería PesqueraUniversidad Autónoma de NayaritTepicNayaritMéxico

Chirostoma jordani is a native annual species inhabiting lacustrine waters of the Central Mexico *** is widely distributed and is currently facing high environmental *** experi-ments were performed to study the reproductive performance of this *** of the experiments were conducted in 270-L indoor recirculation *** males and one female at the first stage of reproduction were included in each test.A photoperiod of 14 light hours and 10 dark hours was *** a fifth experiment,10 females and 15 males were kept in an outdoor 3,000-L recirculation tank under natural *** number of spawns,fertilised eggs and 30-day-old juveniles were counted and the survival rate was *** results indicated significant differences(Pder controlled photoperiod,and higher numbers of juveniles and a higher survival rate were observed under natural *** trials exhibited different patterns of egg produc-tion during the *** egg production in the natural-photoperiod trials followed a polynomial curve *** contrast,the trials under the controlled photoperiod showed an irregular pattern of increases and decreases in egg production.

关键词： breeding Atherinopsidae eggs juveniles survival rate