1,043 research outputs found
Fuzzy Inference System for VOLT/VAR control in distribution substations in isolated power systems
This paper presents a fuzzy inference system for voltage/reactive power
control in distribution substations. The purpose is go forward to automation
distribution and its implementation in isolated power systems where control
capabilities are limited and it is common using the same applications as in
continental power systems. This means that lot of functionalities do not apply
and computational burden generates high response times. A fuzzy controller,
with logic guidelines embedded based upon heuristic rules resulting from
operators at dispatch control center past experience, has been designed.
Working as an on-line tool, it has been tested under real conditions and it has
managed the operation during a whole day in a distribution substation. Within
the limits of control capabilities of the system, the controller maintained
successfully an acceptable voltage profile, power factor values over 0,98 and
it has ostensibly improved the performance given by an optimal power flow based
automation system
Photocatalytic degradation of 2-chlorophenol by tio2: kinetic studies
Kinetic studies of 2-chlorophenol photocatalytic degradation are carried out in a batch stirred built in quartz laboratory scale, using TiO2 as catalyst photoactived with ultraviolet light. Experimental design is performed using as independent variables or factors: catalyst concentration, catalyst calcinations temperature and initial concentration of 2-chlorophenol, to establish the best conditions of the degradation process. The experimental data were fitted with the Langmuir-Hinshelwood model. A kinetic constant k of 0.24 mg L-1min-1 was obtained.Fil: Morales, Graciela del Valle. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Salta. Instituto de Investigación para la Industria Química (i); ArgentinaFil: Sham, Edgardo Ling. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Salta. Instituto de Investigación para la Industria Química (i); ArgentinaFil: Cornejo, Rosario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Salta. Instituto de Investigación para la Industria Química (i); ArgentinaFil: Farfan Torres, M. E.. Universidad Nacional de Salta. Facultad de Ciencias Exactas; Argentin
Controller therapy for asthma: montelukast versus fluticasone
Introducción: El asma es un trastorno inflamatorio crónico de las vías aéreas. Esta inflamación genera un aumento asociado de la hiperreactividad de las vías aéreas a una variedad de estímulos y una limitación del flujo aéreo. El tratamiento controlador del asma tiene como objetivos lograr y mantener control de los síntomas, prevenir las exacerbaciones, mantener la función pulmonar lo mas cerca posible a la normalidad, evitar efectos adversos de la medicación, prevenir obstrucción irreversible de la vía aérea y disminuir la mortalidad. Los medicamentos utilizados para este fin son los antinflamatorios dentro de los cuales se incluyen los grupos de corticoesteroides, cromonas y antileucotrienos. Objetivo: El objetivo de esta revisión bibliográfica es indicar las evidencias encontradas sobre mayor efectividad en este cuadro clínico entre Fluticasona y Montelukast. Material y métodos: Se realizó una revisión bibliográfica, en la cual se utilizo para la búsqueda de información las bases de datos PUBMED, MEDLINE y BIBLIOTECA VIRTUAL DE SALUD artículos científicos publicados en los últimos 5 años que comparan el tratamientote ambos fármacos. Conclusión: El fármaco más efectivo como monoterapia para el tratamiento controlador del asma en niños es la fluticasona frente al montelukast, por lo que esta es considerada la terapia de primera línea.Introduction: Asthma is a chronic inflammatory disorder of the airways. This inflammation is an associated increase in Nonspecific hyperresponsiveness airway to a variety of stimuli and airflow limitation. The asthma controller therapy aims to achieve and maintain control of symptoms, prevent exacerbations, maintaining lung function as close as possible to normal, avoid adverse effects of medication, prevent irreversible obstruction of the airway and reduce mortality . Medicines used for this purpose are the anti-inflammatory within which groups include corticosteroids, chromones and leukotriene. Objective: Fluticasone (inhaled corticosteroid) and montelukast (antileukotriene) are commonly used drugs for the treatment of pediatric asthma controller so that the objective of this review is to summarize the evidence on which of the two showed greater effectiveness in the treatment. Methods: A literature review, which was used to search for information databases PUBMED, MEDLINE and HEALTH LIBRARY scientific articles published over the past 5 years, comparing treatment with fluticasone and montelukast. Conclusion: The most effective drug as monotherapy for asthma controller therapy in children is fluticasone compared with montelukast, so this is considered first-line therapy.Fil: Acevedo, Maria E..Fil: Cano, Alejandra A..Fil: Lopez, Vanina A..Fil: Viola, Luciana S..Fil: Gerometta, Rosana María del Rosario. Universidad Nacional del Nordeste. Facultad de Medicina; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Encapsulación de pulpa de guanábana (Annona muricata) en hidrogeles de alginato de calcio
La guanábana (Annona muricata) constituye una fuente rica de compuestos bioactivos que pueden tener un gran potencial en el desarrollo de alimentos funcionales. En el presente trabajo se obtuvieron hidrogeles de alginato añadidos de diferentes concentraciones de pulpa de guanábana (5, 10 y 20%), mediante gelificación iónica. Los hidrogeles mostraron diámetros de alrededor de 4 mm y alta circularidad. Posterior al secado, los sistemas exhibieron valores de contenido de humedad entre 8 y 10% y de actividad acuosa entre 0,3 y 0,4. Micrografías obtenidas mediante microscopia electrónica de barrido mostraron que la incorporación de pulpa de guanábana al 20% permitió preservar mejor la morfología de las cápsulas. Estos resultados preliminares sugieren que las cápsulas de alginato de calcio conteniendo pulpa de guanábana pueden tener aplicaciones útiles como ingredientes alimentarios saludables.Soursop (Annona muricata), so known as guanábana, constitutes a rich source of bioactive compounds which would have great potential to develop functional foods. In the current work, alginate hydrogels added of different concentrations of soursop pulp (5, 10 and 20 wt.%) were obtained by ionic gelation. Hydrogels showed diameters around 4 mm and high circularity. After drying, the systems exhibited values of water content between 8 and 10% and water activity between 0.3 and 0.4. Moreover, micrographs obtained by scanning electron microscopy showed that the incorporation of soursop pulp at 20% led to better preservation of the morphology of the beads. These preliminary results suggest that the calcium alginate beads containing soursop pulp would have useful applications as healthy food ingredients.Centro de Investigación y Desarrollo en Criotecnología de Alimento
Encapsulación de pulpa de guanábana (Annona muricata) en hidrogeles de alginato de calcio
La guanábana (Annona muricata) constituye una fuente rica de compuestos bioactivos que pueden tener un gran potencial en el desarrollo de alimentos funcionales. En el presente trabajo se obtuvieron hidrogeles de alginato añadidos de diferentes concentraciones de pulpa de guanábana (5, 10 y 20%), mediante gelificación iónica. Los hidrogeles mostraron diámetros de alrededor de 4 mm y alta circularidad. Posterior al secado, los sistemas exhibieron valores de contenido de humedad entre 8 y 10% y de actividad acuosa entre 0,3 y 0,4. Micrografías obtenidas mediante microscopia electrónica de barrido mostraron que la incorporación de pulpa de guanábana al 20% permitió preservar mejor la morfología de las cápsulas. Estos resultados preliminares sugieren que las cápsulas de alginato de calcio conteniendo pulpa de guanábana pueden tener aplicaciones útiles como ingredientes alimentarios saludables.Soursop (Annona muricata), so known as guanábana, constitutes a rich source of bioactive compounds which would have great potential to develop functional foods. In the current work, alginate hydrogels added of different concentrations of soursop pulp (5, 10 and 20 wt.%) were obtained by ionic gelation. Hydrogels showed diameters around 4 mm and high circularity. After drying, the systems exhibited values of water content between 8 and 10% and water activity between 0.3 and 0.4. Moreover, micrographs obtained by scanning electron microscopy showed that the incorporation of soursop pulp at 20% led to better preservation of the morphology of the beads. These preliminary results suggest that the calcium alginate beads containing soursop pulp would have useful applications as healthy food ingredients.Centro de Investigación y Desarrollo en Criotecnología de Alimento
Radio-Optically- and Thermally Stimulated Luminescence of Zn(BO2)2:Tb3+ exposed to Ionizing Radiation
The optical absorption of zinc tetraborate at different concentrations of the terbium impurity (0, 0.5, 1, 2, 4, 8 mol%) was analyzed. The radioluminescence (RL) emission spectra was obtained after beta irradiation of a 90Sr/90Y source. The RL spectrum showed the characteristics bands of Tb3+ with two main emissions at 489 nm and 546 nm which corresponding to the5D4→7F6 and 5D4→7F5 transitions respectively in this ion. The OSL and TL characteristics have been analyzed. The stimulation blue light (497 nm) of a diode laser at 500 mA was used to bleach the thermoluminescent (TL) signals obtained with 5Gy of 60Co source. The two main glow peaks (79 and 161 °C) are sensitives under 497 nm stimulation, and they were shifted to higher temperature values and faded their TL intensities. Similar behavior of TL glow curves before and after OSL stimulation with blue light was observed when the samples were exposed to 30 Gy gamma dose of 137Cs irradiator. The OSL signal response was linear with the dose range of 1-10 Gy and increased their response up to 200 Gy gamma dose. The OSL shows a bleaching sensitive shallow traps and diminishing the intensity of the TL glow curves remaining a complex traps distribution. The RL, TL and OSL properties were investigated in Zn(BO2)2:Tb3+ phosphor
Comparison of cross-matching method for detection of DEA 7 blood incompatibility
We compared 3 major cross-match (XM) tests to identify dog erythrocyte antigen (DEA) 7 blood incompatibilities in dogs as a result of anti\u2013DEA 7 antibodies: gel (GEL), standard tube (TUBE) agglutination, and immunochromatography strips (STRIP). Blood samples from 42 dogs were typed for DEA 7; 2 tested DEA 7\u2013positive (DEA 7+). The 40 DEA 7\u2013negative (DEA 7\u2013) plasma samples were cross-matched against the 2 DEA 7+ and 3 DEA 7\u2013 red blood cell (RBC) samples by GEL to identify samples with anti\u2013DEA 7 antibodies. Twenty DEA 7\u2013 plasma samples without and with anti\u2013DEA 7 antibodies were cross-matched with samples of the 2 DEA 7+ RBCs in a double-blind fashion using the TUBE and STRIP XM methods. GEL results were used as the reference method for comparison. To determine relationships between results, 2
7 2 tables were used. Cohen kappa coefficient (\u3ba) was calculated between results of GEL and the other 2 methods. With GEL, 21 of 40 XM tests were positive and 19 of 40 negative for anti\u2013DEA 7 antibodies. The same results were obtained by TUBE, whereas only 1 of 40 XM tests was positive by STRIP. There was a statistically significant relationship between results of GEL and TUBE (p < 0.000) with perfect agreement (\u3ba = 1.000), but not between GEL and STRIP results (p = 1.000) in which agreement was equivalent to chance (\u3ba = 0.0453). The GEL and TUBE XM tests, but not STRIP, are useful methods for identification of DEA 7 incompatibilities caused by anti\u2013DEA 7 antibodies
Homoeostasis between the GTPase Spg1p and its GAP in the regulation of cytokinesis in S. pombe
Cytokinesis in Schizosaccharomyces pombe begins at mitotic entry, when the site of division is defined by formation of the contractile acto-myosin ring (CAR) at the cell cortex. Contraction of the CAR and formation of the division septum are triggered at the end of mitosis by septation initiation network (SIN) proteins associated with the spindle pole body (SPB). SIN signalling requires activation of the GTPase Spg1p, which is regulated by the bipartite GTPase-activating protein (GAP) Byr4p-Cdc16p. We show that, for Spg1p to associate with the SPB, it must be bound to its GAP or to its mitotic effector, the protein kinase Cdc7p. Analysis of the GAP proteins reveals that the steady-state level of Byr4p reflects that of Spg1p. Furthermore, if the interaction of Byr4p with Spg1p is compromised, the level of Byr4p decreases dramatically. The adaptation of the level of Byr4p to that of Spg1p requires the presence of Cdc16p and is mediated by proteasome-dependent destruction. It requires neither association with the SPB nor an active SIN. We propose a mechanism that limits the amount of the Byr4p-Cdc16p GAP to the amount required to inhibit Spg1p signalling
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