Author: Luis Hernández Martínez
El presente es el reporte del proyecto de diagnóstico energético eléctrico en la empresa
Bebidas Mundiales S.A. de C.V. desarrollado en los meses de diciembre de 2011 a
agosto de 2012, el cual incluye la revisión visual de las instalaciones y equipo eléctrico,
adquisición de datos a través de la medición de variables de potencia y calidad eléctrica,
así como su análisis para una propuesta de mejoramiento en la eficiencia energética y
disminución de problemas de calidad eléctrica.
Jose Luis Hernandez Martinez (2016)
Jose Luis Hernandez Martinez (2016)
The continuous scaling for fabrication technologies of electronic circuits demands the design of new and improved simulation techniques for integrated circuits. Therefore, this work shows a new double bounded polynomial homotopy based on a polynomial formulation with four solution lines separated by a fixed distance. The new homotopy scheme presents a bounding between the two internal solution lines and the symmetry axis, which allows to establish a stop criterion for the simulation in DC. Besides, the initial and final points on this new double bounded homotopy can be set arbitrarily. Finally, mathematical properties for the new homotopy are introduced and exemplified using a benchmark circuit.
The health system for any country is one of the top priorities to guarantee the proper development for their citizens. For the specific case of Mexico, management of medical records is still being done using physical files whether patient attends a public or private physician or hospital. This poses a potential problem for the health structure and the patient because physical files tend to deteriorate, damage, could be stolen or mishandled. One possibility is to evolve from the use of physical files and create electronic medical records. Mexico already has an official standard for medical records; this standard could serve as the foundation to devise an electronic universal record. The idea for the electronic universal record is to serve as the base to implement an electronic public health scheme. This article will provide several key aspects to take into account in order to provide an efficient, secure and cost efficient electronic medical record. Aspects to be considered include: standardized medical nomenclature, clinical procedures, data transmission standards, legal aspects, electronic security, and data storage schemes. The impact of this proposal for Mexico will be discussed in detail.
In recent years, artificial intelligence methods have been used for the treatment of environmental problems. This work, presents two models for assessment and prediction of air quality. First, we develop a new computational model for air quality assessment in order to evaluate toxic compounds that can harm sensitive people in urban areas, affecting their normal activities. In this model we propose to use a Sigma operator to statistically asses air quality parameters using their historical data information and determining their negative impact in air quality based on toxicity limits, frequency average and deviations of toxicological tests. We also introduce a fuzzy inference system to perform parameter classification using a reasoning process and integrating them in an air quality index describing the pollution levels in five stages: excellent, good, regular, bad and danger, respectively. The second model proposed in this work predicts air quality concentrations using an autoregressive model, providing a predicted air quality index based on the fuzzy inference system previously developed. Using data from Mexico City Atmospheric Monitoring System, we perform a comparison among air quality indices developed for environmental agencies and similar models. Our results show that our models are an appropriate tool for assessing site pollution and for providing guidance to improve contingency actions in urban areas.
The continuous monitoring of physical, chemical and biological parameters in shrimp culture is an important activity for detecting potential crisis that can be harmful for the organisms. Water quality can be assessed through toxicological tests evaluated directly from water quality parameters involved in the ecosystem; these tests provide an indicator about the water quality. The aim of this study is to develop a fuzzy inference system based on a reasoning process, which involves aquaculture criteria established by official organizations and researchers for assessing water quality by analyzing the main factors that affect a shrimp ecosystem. We propose to organize the water quality parameters in groups according to their importance; these groups are defined as daily, weekly and by request monitoring. Additionally, we introduce an analytic hierarchy process to define priorities for more critical water quality parameters and groups. The proposed system analyzes the most important parameters in shrimp culture, detects potential negative situations and provides a new water quality index (WQI), which describes the general status of the water quality as excellent, good, regular and poor. The Canadian water quality and other well-known hydrological indices are used to compare the water quality parameters of the shrimp water farm. Results show that WQI index has a better performance than other indices giving a more accurate assessment because the proposed fuzzy inference system integrates all environmental behaviors giving as result a complete score. This fuzzy inference system emerges as an appropriated tool for assessing site performance, providing assistance to improve production through contingency actions in polluted ponds.
Tema del mes
Los organismos que habitan los océanos han llamado la atención de las instituciones farmacéuticas en las últimas décadas, debido a las características estructurales y funcionales que presentan las toxinas que componen los venenos que algunos de estos organismos sintetizan. Uno de estos grupos de organismos son los caracoles marinos del género Conus, que tienen la habilidad de sintetizar moléculas capaces de interactuar específicamente con canales iónicos y receptores. Se ha querido aprovechar esta característica para el tratamiento de distintos padecimientos, de los cuales se ha documentado la participación de proteínas de membrana responsables de su patogénesis y progresión en el ser humano. Existen varias conotoxinas y conopéptidos aún en pruebas clínicas y preclínicas, siendo la conotoxina ω-MVIIA (Ziconotide) aislada de Conus magus la más popular, debido a su utilidad para el tratamiento de dolor neuropático en pacientes con cáncer y SIDA.
Organisms that inhabit oceans have drawn the attention of pharmaceutical institutions in recent decades, due to structural and functional characteristics of the toxins that constitute the venoms that some of these organisms synthesize. Marine snails of the genus Conus are one of these groups of organisms that have the capacity to synthesize molecules that specifically interact with ion channels and receptors. Advantage has been taken of this characteristic for the treatment of various diseases of which, it has been documented the involvement of certain types of membrane proteins responsible for the pathogenesis and progression in humans. For these reasons, there are several conotoxins and conopeptides in preclinical and clinical trials. However, ω-conotoxin MVIIA (Ziconotide) isolated from Conus magus is the best known because of its usefulness for the treatment of neuropathic pain in patients with cancer and AIDS.
"Using a random block design with factorial arrangement (3x3) with five replications, the components of the yield and bromatological composition of three Brachiaria varieties (Decumbens, Brizantha and Mulato l) and three regrowth ages (21, 42 and 63 days) were studied in El Empalme area, Ecuador. The yields of total dry matter, biomass, leaves and stems were determined, as well as the plant height, length and width of leaves, the contents of DM, CP, NDF, ADF, ADL, cellulose (Cel), hemicellulose ( Hcel), cellular content (CC), P, Ca, ash, OM, DMD, OMD, ME, FNE and relations leaf-stem, NDF-N and ADF-N. Analysis of variance was performed according to experimental design. There was significant interaction (P<0.0001) between the varieties and the regrowth age for all the studied indicators. The highest DM and biomass yields were obtained in Mulato 1 at 63 days of regrowth (2.49 and 8.64 t/ha, respectively). The CP and CC decreased with the maturity of the plant and the best values were obtained in Mulato 1 and Brizantha at 21 days of regrowth (14.23 and 74.77 %, respectively), while the components of the cell wall increased with age and Decumbens showed the highest values. There was variability in the studied indicators in the varieties, with the best general performance for Mulato 1. It was demonstrated that as the maturity of the plant advanced, there was a decrease in its nutritional quality, determined among other aspects, by the lower digestibilities and energy, as well as increases in the relations NDF/N, ADF/N. However, although leaf/stem ratio decreased with age, leaf production in all studied cultivars was above 50 % with respect to stems, aspects to be taken into account in the management of these plants in ruminants production systems."
"Mediante un diseño bloque al azar con arreglo factorial (3x3) con cinco réplicas se estudiaron los componentes del rendimiento y composición bromatológica de tres variedades de Brachiaria (Decumbens, Brizantha y Mulato l) y tres edades de rebrote (21, 42 y 63 días) en la zona El Empalme, Ecuador. Se determinaron los rendimientos de materia seca total, biomasa, hojas y tallos; así como la altura de la planta, longitud y ancho de las hojas, los contenidos de MS, PB, FDN, FDA, LAD, celulosa (Cel), hemicelulosa (Hcel), contenido celular (CC), P, Ca, ceniza, MO, DMS, DMO, EM, ENL y las relaciones hoja-tallo, FDN-N y FDA-N. Se realizó análisis de varianza según diseño experimental. Hubo interacción significativa (P<0.0001) entre las variedades y la edad de rebrote para todos los indicadores estudiados. Los mayores rendimientos de MS y de biomasa se obtuvieron en Mulato 1 a los 63 días de rebrote (2.49 y 8.64 t/ha, respectivamente). PB y el CC disminuyeron con la madurez de la planta y los mejores valores se obtuvieron en Mulato 1 y Brizantha a los 21 días de rebrote (14.23 y 74.77 %, respectivamente), mientras que los componentes de la pared celular se incrementaron con la edad y los mayores valores lo presentó Decumbens. Hubo variabilidad en los indicadores estudiados en las variedades, con el mejor comportamiento general para el Mulato 1. No obstante, quedó demostrado que en la medida que avanzó la madurez de la planta hubo disminución de su calidad nutritiva determinado, entre otros aspectos, por las menores digestibilidades y energía, así como incrementos de las relaciones FDN/N, FDA/N. No obstante, aunque decreció relación hoja/tallo con la edad la producción de hojas en todos los cultivares estudiados estuvo por encima del 50 % con respecto a los tallos, aspectos a tener en cuenta en el manejo de estas plantas en los sistemas de producción para rumiantes."
bromatological composition, regrowth age, Brachiaria, quality, digestibility, energy composición bromatológica, edad de rebrote, calidad, digestibilidad, energía CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CIENCIAS AGRARIAS AGRONOMÍA CULTIVOS FORRAJEROS CULTIVOS FORRAJEROS
"The gar, Atractosteus tropicus is a native fish distributed in fluvial systems of the Mexican southeast, which presents aquaculture potential in the food industry and as ornamental species. However, it is necessary to deepen the knowledge for the optimization of its culture. The present study examined the effect of three feeding frequencies on the growth, survival, and condition of juveniles. The fish (90) were placed in nine 35 L tanks, (n = 10; three replicates per treatment). The feed (44% protein, 15% fat) was supplied to 2% of the biomass, divided into 2, 4 and 6 servings throughout 10 h for eight weeks. After eight weeks the standard length, wet weight, survival, Fulton K, specific growth rate, nitrogen carbon rate, the coefficient of variation and size heterogeneity were recorded, which were analyzed with a one-way ANOVA. There were no significant differences among treatments for any of the response variables. The overall results indicated that in general both the culture conditions and the three food frequencies tested were adequate for the species. The results indicate the high flexibility of the species to be cultured with minimum requirements of the food supply, which can translate into the optimization of production costs."