Comparación de algoritmos multiobjetivo inspirados en búsqueda armónica, búsqueda cuco y murciélagos para la ubicación de generación distribuida renovable

Electric power losses have a significant impact on the total costs of distribution networks. The use of renewable energy sources is a major alternative to improve power losses and costs, although other important issues are also enhanced such as voltage magnitudes and network congestion. However, determining the best location and size of renewable energy generators can be sometimes a challenging task due to a large number of possible combinations in the search space. Furthermore, the multiobjective functions increase the complexity of the problem and metaheuristics are preferred to find solutions in a relatively short time. This paper evaluates the performance of the cuckoo search (CS), harmony search (HS), and bat-inspired (BA) algorithms for the location and size of renewable distributed generation (RDG) in radial distribution networks using a multiobjective function defined as minimizing the energy losses and the RDG costs. The metaheuristic algorithms were programmed in Matlab and tested using the 33-node radial distribution network. The three algorithms obtained similar results for the two objectives evaluated, finding points close to the best solutions in the Pareto front. Comparisons showed that the CS obtained the minimum results for most points evaluated, but the BA and the HS were close to the best solution.Las pérdidas eléctricas tienen un impacto significativo en los costos totales de las redes de distribución. El uso de las energías renovables es una gran alternativa para mejorar las pérdidas y los costos, aunque también otros problemas en las magnitudes de las tensiones y la congestión de la red pueden ser mejorados. Sin embargo, determinar la mejor localización y dimensionamiento de generadores eléctricos renovables puede ser a veces una tarea difícil debido al gran número de combinaciones posibles existentes en el espacio de búsqueda. Además, el uso de funciones multiobjetivo incrementa la complejidad del problema y se prefiere usar las metaheurísticas para encontrar soluciones en un tiempo relativamente corto. En este trabajo se evalúa el desempeño de los algoritmos inspirados en búsqueda cuco, búsqueda armónica y murciélagos para la localización y dimensionamiento de la generación distribuida renovable en redes de distribución radiales, usando funciones como la minimización de las pérdidas de energía y los costos de la generación distribuida renovable. Las metaheurísticas fueron programadas en Matlab y evaluadas usando la instancia denominada red de distribución radial de 33 nodos. Los tres algoritmos evaluados obtuvieron resultados similares para los dos objetivos evaluados, encontrando Frentes de Pareto cercanos a las mejores soluciones. La comparación realizada mostró que la búsqueda cuco obtiene los mejores resultados, pero los algoritmos inspirados en murciélagos y búsqueda armónica obtuvieron resultados cercanos a la mejor solución

Estudio de Invernadero sobre la Resistencia Mecánica del Suelo al Crecimiento del Sistema Radicular.

Este trabajo fue realizado en la Granja Experimental y en el Laboratorio de Suelo de la Universidad Tecnológica del Magdalena. El objetivo primordial de éste trabajo científico era el de estudiar el efecto de la compactación del suelo sobre el Sistema Radicular del Maíz de la Soya evaluándose el resultado final a través lecturas realizadas cada 7 días con respecto a la producción en base a materia seca. La compactación de los suelos por maquinaría e implementos agrícolas es un efecto adverso que ocasiona bajas en la producción debido a la reducción en la capacidad poral con el respectivo incremento negativo en el contenido de gas carbónico (CO2 ) y oxígeno . Así como también la cantidad de agua asimilable por los cultivos. La velocidad del crecimiento del sistema radicular está ligada a la carencia de oxígeno o al aumento de gas carbónico en el suelo. La cantidad de oxígeno disminuye en los suelos a medida que estos se compactan por un efecto mecánico a largo plazo y se originen los panes. Un sistema radicular deficiente en su crecimiento induce a una baja en la producción. Todo lo anterior era con el fin de observar que el mejor de los tratamientos fue el O (testigo) ya que el suelo no tenía ninguna clase de presión y por lo tanto las raíces absorbían con mayor facilidad el agua, lo que no ocurría con los tratamientos 7,8,9 y10 debido a que estos si tenían presiones, mayores y por lo tanto el suelo estaba más compactado Esto se comprobó a los 51 días de haber sembrado estuvimos trabajando con un suelo franco arcilloso, de textura mediana con poca materia orgánica y con un PH de 7.3 . También cabe anotar que las raíces sufren cambio morfológico y fisiológicos según la especie vegetal como reacción a la aeración del suelo

The Code Stroke: medical evaluation by a pre-hospital attention service

In 1996, the NINDS (National Institute of Neurological Disorders and Treatment of Acute Stroke) published targets for the management of patients with acute cerebrovascular events, setting a time of 3 h or less for administration of thrombolytics, creating the Code Stroke. Objective: Evaluate the time between onset of symptoms and arrival at the emergency department of a hospital as prognostic factors in patients with cerebrovascular events attended by the prehospital emergency medical service in the metropolitan area of Monterrey, Nuevo Leon. Materials and methods: Calls received in the ED (EMME) between January and December 2012 were included in a retrospective cross-sectional study, with symptoms showing within the first 8 h or with an unknown onset. The Mann---Whitney test and Fisher’s exact test were used. Results: Thirty-six patients were included in the study. In 21, the final diagnosis was cerebral infarction, 5 patients were treated with thrombolysis (23.8%). They were divided into two groups: group 1 died or were left with severe neurological sequelae (n = 9) and Group 2 survived without sequelae or mild neurological sequelae (n = 12). The door hospital arrival time was 67 (29---116) min (Group 1) versus 54 (24---86) min (Group 2) (p = 0.110). The neurological status at the start of the event affected prognosis and mortality (p = 0.018). Conclusions: There are few studies analyzing the time between the inception of the symptomatology and the arrival to the emergency room. In our study 23.8% of this series were thrombolyzed, which puts us in the range of international statistics, compared to the series published by Geffner-Sclarsky et al. The population of this study is small so it is not able to show statistical differences, but the few studies that evaluate the Code Stroke in Mexico open the doors to future work with a larger population in Latin American society

In vitro study of antiamoebic activity of methanol extract of fruit of Pimpinella anisum on trophozoites of Entamoeba histolytica HM1-IMSS

The aniseed plant Pimpinella anisum (Saunf-Hindi) is one of the most ancient medicinal plants used by man. Currently, this plant has several uses in the food industry as spice, whereas in the pharmacopoeia, it is used as an expectorant in digestive disturbances, as mild diuretic, and as insect repellent in external use. In this paper, we evaluated the biological activity of methanolic extract of P. anisum on in vitro growth of Entamoeba histolytica HM1-IMSS under axenic conditions. We observed that the growth inhibition of E. histolytica was at CI50 = 0.034 μg/mL. Results confirm the antiamoebic activity of the methanolic extract of P. anisum.Keywords: Pimpinella anisum, Entamoeba histolytica, antiamoebic activity, medicinal plantsAfrican Journal of Biotechnology Vol. 12(16), pp. 2065-206

Proactive esophageal cooling protects against thermal insults during high-power short-duration radiofrequency cardiac ablation

[EN] Background Proactive cooling with a novel cooling device has been shown to reduce endoscopically identified thermal injury during radiofrequency (RF) ablation for the treatment of atrial fibrillation using medium power settings. We aimed to evaluate the effects of proactive cooling during high-power short-duration (HPSD) ablation. Methods A computer model accounting for the left atrium (1.5 mm thickness) and esophagus including the active cooling device was created. We used the Arrhenius equation to estimate the esophageal thermal damage during 50 W/ 10 s and 90 W/ 4 s RF ablations. Results With proactive esophageal cooling in place, temperatures in the esophageal tissue were significantly reduced from control conditions without cooling, and the resulting percentage of damage to the esophageal wall was reduced around 50%, restricting damage to the epi-esophageal region and consequently sparing the remainder of the esophageal tissue, including the mucosal surface. Lesions in the atrial wall remained transmural despite cooling, and maximum width barely changed (<0.8 mm). Conclusions Proactive esophageal cooling significantly reduces temperatures and the resulting fraction of damage in the esophagus during HPSD ablation. These findings offer a mechanistic rationale explaining the high degree of safety encountered to date using proactive esophageal cooling, and further underscore the fact that temperature monitoring is inadequate to avoid thermal damage to the esophagus.Research reported in this publication was supported by the National Heart, Lung, And Blood Institute of the National Institutes of Health under Award Number R44HL158375 (the content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health) and by the Spanish Ministerio de Ciencia, Innovacion y Universidades/Agencia Estatal de Investigacion (MCIN/AEI/10.13039/501100011033 under grant RTI2018-094357-B-C21).Mercado Montoya, M.; Gomez Bustamante, T.; Berjano, E.; Mickelsen, SR.; Daniels, JD.; Hernández Arango, P.; Schieber, J.... (2022). Proactive esophageal cooling protects against thermal insults during high-power short-duration radiofrequency cardiac ablation. International Journal of Hyperthermia. 39(1):1202-1212. https://doi.org/10.1080/02656736.2022.21218601202121239

Bacterias marinas antagonistas de Staphylococcus aureus y Vibrio parahaemolyticus, agentes de enfermedades trasmitidas por alimentos.

Este estudio tuvo como objetivo la identificación de microorganismos marinos de las costas mexicanas que presentenactividad antimicrobiana contra Staphylococcus aureus y Vibrio parahaemolyticus, conocidos en el ámbito mundial por ser agentes de intoxicación alimentaria. Se colectaron muestras representativas de algas, sedimentos salinos, crustáceos y moluscos. De las 42 cepas probadas, 15 inhibieron estos patógenos. La secuenciación del gen 16S rRNA identificó solo cepas de Bacillus. Las cepas con la actividad inhibidora más alta contra S. aureus fueron B. aerius y B. pumilus. Las cepas B. pumilus, B. altitudinis y B. oryzicola mostraron una mayor actividad antimicrobiana contra V. parahaemolyticus. Este es el primer estudio del aislamiento de B. aerius, B. oryzicola, B. safensis, B. boroniphilus y B. altitudinis de ecosistemas marinos en México, así como el primer estudio que reporta sus efectos inhibidores contra S. aureus y V. parahaemolyticus. Los compuestos activos de los antagonistas se están identificando y evaluando actualmente. Los ecosistemas marinos tienen la mayor diversidad bacteriana asociada con invertebrados y algas; sin embargo, esta diversidad bacteriana no ha sido bien estudiada en las costas mexicanas

Implementation of an e.r.p. Inventory module in a small colombian metalworking company

This paper aims to analyze the effect of implementing an inventory module of ERP Openbravo for the reduction of information flow time and customer response time, in a Colombian metalworking company. The processes structure and inventory management practices of the company were characterized and information flow time and customer response time were tested before and after implementing the inventory module. The main results were the reduction of 36% of information flow time and 41% of customer response time, so it can be concluded that obtained success is related to the active involvement of manager and workers’ willingness to change

The European Eel NCCβ Gene Encodes a Thiazide-Resistant Na-Cl Cotransporter

The thiazide-sensitive Na-Cl cotransporter (NCC) is the major pathway for salt reabsorption in the mammalian distal convoluted tubule. NCC plays a key role in the regulation of blood pressure. Its inhibition with thiazides constitutes the primary baseline therapy for arterial hypertension. However, the thiazide-binding site in NCC is unknown. Mammals have only one gene encoding for NCC. The eel, however, contains a duplicate gene. NCCα is an ortholog of mammalian NCC and is expressed in the kidney. NCCβ is present in the apical membrane of the rectum. Here we cloned and functionally characterized NCCβ from the European eel. The cRNA encodes a 1043-amino acid membrane protein that, when expressed in Xenopus oocytes, functions as an Na-Cl cotransporter with two major characteristics, making it different from other known NCCs. First, eel NCCβ is resistant to thiazides. Single-point mutagenesis supports that the absence of thiazide inhibition is, at least in part, due to the substitution of a conserved serine for a cysteine at position 379. Second, NCCβ is not activated by low-chloride hypotonic stress, although the unique Ste20-related proline alanine-rich kinase (SPAK) binding site in the amino-terminal domain is conserved. Thus, NCCβ exhibits significant functional differences from NCCs that could be helpful in defining several aspects of the structure-function relationship of this important cotransporter

Models Markovian to CSP Plans for acceptance sampling

En este trabajo se presentan modelos para crear planes CSP de muestreo por aceptación a través de modelos matemáticos estadísticos apoyado de las teorías de markov, cadenas de estados de markov y los diferentes planes de muestreo. De esta manera, se diseña un modelo matemático-estadístico bajo los lineamientos de las teorías bayesiana y markoviana de estados probabilísticos aplicados a los planes CSP de muestreo por aceptación en producción continua. Este modelo funciona como medio de control para la reducción de productos no conformes en la entrega a clientes con el propósito de mejorar la productividad y competitividad de la empresa.In this work presents models of statistical sampling plans for acceptance CSP supported Marcov theories, states of Markov chains and different sampling plans in this way to design a mathematical-statistical model under the guidance of the Bayesian theory and applied probabilistic Markov state CSP plans for acceptance sampling in continuous production function as control means for reducing non-conforming products delivery to customers by the company with production lines of this type, capable of improving competitiveness in international organizations and national and international markets, supported both in the technology resulting in reduced costs and increased productivity

Size, Age, and Spatial-Temporal Distribution of Shortfin Mako in the Mexican Pacific Ocean

Abstract Basic population parameters such as age, size, and distribution have been poorly evaluated for the Shortfin Mako Isurus oxyrinchus in the Mexican Pacific Ocean. According to data collected by scientific observers on board medium-size fishing vessels during the period of 2006–2013, size as TL was obtained for 5,740 individual sharks. The range of TL was 70–362 cm for females and 71–296 cm for males. Weight (W), measured randomly from 1,409 individuals, ranged from 2 to 90 kg for females and from 2 to 80 kg for males. The weight-to-TL ratio was best fitted by the equation W = 4 × 10−5(TL)2.59 (r2 = 0.6532). No sex-specific difference was found in the weight-to-TL relationship between males and females, nor in W or TL separately. By using the inverse von Bertalanffy equation and parameters described by other authors for the same study area, we determined the age range for individuals captured on the basis of their TL. The age ranged from 0 to 39 years in females and from 0 to 21 years in males. Using a logistic model, the mean length at sexual maturity was obtained for 2,532 males (TL = 190 cm). The quarterly distribution of young of the year and 1-year-old juveniles showed that there is a tendency for these sharks to mov