Integrated Modelling of Gas and Electricity Distribution Networks with a High Penetration of Embedded Generation

Gas-based combined heat and power (CHP) has matured enough to be regarded as the next evolutionary step in promoting energy efficiency use in the urban environment. Although its potential market is increasing, little research has been conducted into the combined technical effects that a high penetration of these units may have on both natural gas and electric (G&E) distribution networks. This paper presents a power flow tool that performs a simultaneous assessment on some technical impacts that a high penetration of heat-driven cogeneration units may have on G&E networks. A case study is presented and results show that as expected, the gas demand increases as well as the losses associated with its delivery, while the opposite effects occur in the electrical system. However, less evident is the load profile variations distribution networks will experience and that overall energy losses will vary according to the CHP penetration and the type of technology used. The study shows that an integrated G&E analysis offers a fresh perspective in quantifying the effects cogeneration technologies will have on energy distribution networks

Conocimiento y participación ciudadana sobre procesos de Gestión Municipal en el Distrito de Nueva Cajamarca, Región San Martín, 2019

La presente investigación tuvo como objetivo determinar la relación entre el nivel de conocimiento y la participación ciudadana sobre los procesos de gestión municipal del distrito de Nueva Cajamarca, región San Martín 2019; además, el propósito fue conocer la relación entre nivel de conocimiento, participación ciudadana y procesos de gestión municipal. La investigación se desarrolló de manera sistemática y correlacional, tuvo un alcance descriptivo transversal, de diseño no experimental y enfoque cuantitativo. El tamaño de muestra ha sido calculado con un margen de error del 5% y 95% de nivel de confianza. Dicha muestra estuvo constituida por 380 personas jefes de hogar (hombres y mujeres) mayores de 18 años de edad, residentes en la zona urbana de Nueva Cajamarca, a quienes se les aplicó tres cuestionarios con escala tipo Likert: el primero con 13 preguntas sobre conocimiento, el segundo con 26 preguntas respeto a participación ciudadana y el tercero con 17 preguntas sobre procesos de gestión municipal. La confiabilidad de cada cuestionario se hizo mediante el coeficiente Alfa de Crombach. Los datos fueron procesados y analizados mediante el paquete estadístico SPSS versión 26. Los resultados demostraron que existe relación significativa (������������������������ < 0.05) entre el nivel de participación ciudadana y el nivel de conocimiento de la población de Nueva Cajamarca; también se comprobó que existe relación significativa (������������������������ < 0.05) entre el nivel conocimientos y la participación de la ciudadanía en los procesos de gestión municipal; además, se determinó que existe relación significativa entre nivel de participación ciudadana en los procesos de gestión municipal de la población de Nueva Cajamarca por lo que. Se concluye que en nivel de conocimientos y la participación de los ciudadanos ayuda en la mejora de los procesos de gestión municipal del distrito de Nueva Cajamarca.The purpose of the this research was to determine the relationship between the level of knowledge and citizen participation about the municipal management processes of Nueva Cajamarca district, in the region of San Martín in 2019; Furthermore, the purpose was to know the relationship between the level of knowledge, citizen participation and municipal management processes. This research was developed in a systematic and correlational way, it had a descriptive cross-sectional scope, of non-experimental design and a quantitative approach. The sample size has been calculated with an error margin of 5% and a 95% of confidence level. This sample consisted of 380 people who are heads of households (men and women) over 18 years of age, they are residents of the urban area of Nueva Cajamarca, who were given three Likert-type questionnaires: the first with 13 questions on knowledge, the second with 26 questions about citizen participation and the third with 17 questions on municipal management processes. The reliability of each questionnaire was made using the Crombach's alpha coefficient. The data was processed and analyzed using the SPSS statistical package version 26. The results showed that there is a significant relationship (������������������ < 0.05) between the level of citizen participation and the level of knowledge of the population of Nueva Cajamarca; It was also verified that there is a significant relationship (������������������ < 0.05) between the level of knowledge and the participation of citizens in municipal management processes; besides, it was determined that there is a significant relationship between the level of citizen participation in the municipal management processes of the population of Nueva Cajamarca, therefore. It is concluded that at the level of knowledge and the participation of citizens it helps to improve the municipal management processes of the Nueva Cajamarca district

El desarrollo de la gestión municipal y percepción social en el distrito de Niepos, durante el marco de la emergencia COVID-19, 2021

Tras el desarrollo del estudio científico presente, la indagadora tuvo como objetivo principal determinar la incidencia del desarrollo de la gestión municipal en la percepción social en el distrito de Niepos, durante el marco de la emergencia COVID-19, 2021, ya que se ha generado un problema significativo de aspecto sociopolítico, es decir, cada día se evidencia el pensamiento negativo del poblador frente a lo que realizan sus autoridades en el tiempo que se les dio la confianza para manejar los recursos estatales. En base al aspecto metodológico, la indagadora generó un tipo de investigación explicativa, de alcance básico, enfoque cuantitativo y diseño no experimental. Además, se aplicó un cuestionario en estudio a un total de 355 ciudadanos respecto al desarrollo de las dos variables de estudio. Se concluye que existe una incidencia de la gestión municipal en la percepción social, esto según los resultados de la correlación de Pearson (r=0.756), lo que se deduce que mientras exista haya una mala gestión de recursos estatales, existirá una mala percepción social del ciudadano en la entidad local del distrito de Niepos

Method for the recovery of images in databases of Rice grains from visual content

This paper presents a method for detecting and identifying defects in polished rice grains from their scanned image using an expert system. The sample used is designed to contain specimens with the most common defects. Digital image processing techniques were used to identify different types of visible defects in rice grains that affect the quality of the sample. The proposed method has advantages over manual identification such as reduced analysis times, repeatability of results, eliminates subjectivity in identification, records and stores information, uses easily accessible equipment and has a relatively low cost

Calculation model and methodology for stiffness evaluation in hydraulics cylinders

In the paper an analysis scheme able to considerate of all the main geometric and load factors that affect the behavior of a hydraulic cylinder in its action as a flexural-compression member. Also, experimental validations of the model are shown too. A methodology to identify the conditions leading to the instability of the cylinder is established

Calculation model and methodology for stiffness evaluation in hydraulics cylinders

In the paper an analysis scheme able to considerate of all the main geometric and load factors that affect the behavior of a hydraulic cylinder in its action as a flexural-compression member. Also, experimental validations of the model are shown too. A methodology to identify the conditions leading to the instability of the cylinder is established

Effect of increasing docosahexaenoic acid content in weaning diets on survival, growth and skeletal anomalies of longfin yellowtail (Seriola rivoliana, Valenciennes 1833)

Five isoproteic (54.8%) and isolipidic (24.1%) microdiets, which varied in their docosahexaenoic acid (DHA) content (0.25, 0.75, 1.64, 1.99 and 3.17%; dw), were manufactured to determine its effects on longfin yellowtail Seriola rivoliana larvae in terms of fish biological performance, whole body fatty acid profile and incidence of skeletal anomalies from 30 dah (11.31 &plusmn; 1.79 Total Length, TL) to 50 dah (19.80&plusmn;0.58 mm TL). The inclusion of dietary DHA up to 3.17% (dw) improved larval resistance to air exposure, although DHA did not significantly affect fish final growth or final survival. Indeed, high levels of dietary DHA (1.99% and 3.17%, dw) tended to increase the incidence of skeletal anomalies in S. rivoliana larvae, albeit no significant differences were observed. Furthermore, the occurrence of severe anomalies such as kyphosis and lordosis, was mainly associated to the larvae fed with the highest levels of dietary DHA. In terms of survival, increasing dietary DHA levels did not significantly affect longfin yellowtail survival rate, despite a tendency for enhanced survival. The results of the present study proved that the inclusion of dietary DHA in inert diets up to a 3.17% (dw) and a DHA/EPA ratio above 3.1 increased the final survival and stress resistance in S. rivoliana larvae

Does nitrogen fertilization rate, timing and splitting affect sunflower yield and grain quality?

Nitrogen (N) deficiency could have a negative effect on sunflower (Helianthus annuus L.) yield and grain quality. Therefore, it is necessary to adjust the optimum rate, timing, and frequency of N fertilization to improve sunflower crop nutrition. Our objective was to evaluate the effect of N fertilization rate, timing, and splitting on grain yield, and grain and oil quality. Twelve field experiments were carried out between 2016 and 2020. Treatments consisted of at least three N rates ranging from 0 to 200 kg N ha−1 applied at V2. Moreover, the 80 kg N ha−1 rate was applied at V14 (80NV14) or split between V2 and V14 (80Nsplit). Treatments were evaluated in two sunflower genotypes, high oleic (HO) and conventional (CONV). A significant grain yield response to N fertilization was observed in six out of twelve experiments, generally at rates greater than 80 kg ha−1. The mean response to fertilization was 369 kg ha−1. Fertilization increased grain protein concentration (PG) (+1.5%) at experiments E1–E3 and E9–E12 and decreased oil concentration (OG) (−2%) at experiments E1, E4, E9, E11, and E12. The maximum N rate, increased oleic and stearic acid concentration (+3%–4%), depending on the genotype (AO and CONV). Neither fertilizer timing nor splitting affected grain yield or OG. Late N fertilization (V14) increased oleic acid (+2.4%), whereas it decreased linoleic acid (+2.2%). Based on our results, N fertilization can increase yield without negatively affecting commercial grain quality (OG and fatty acids concentration), regardless of fertilization timing and frequency.Fil: Tovar Hernandez, Sergio. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; ArgentinaFil: Carciochi, Walter Daniel. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; ArgentinaFil: Izquierdo, Natalia Gabriela. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; ArgentinaFil: Wyngaard, Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; ArgentinaFil: Barbieri, Pablo Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; ArgentinaFil: Reussi Calvo, Nahuel Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentin

LC-IMS-HRMS for identification of biomarkers in untargeted metabolomics: The effects of pterostilbene and resveratrol consumption in liver steatosis, animal model

Untargeted metabolomics with the combination of ion mobility separation coupled to high resolution mass spectrometry (IMS-HRMS) was applied to investigate the impact of resveratrol and pterostilbene supplementation on the metabolic fingerprint of the Wistar rats liver with induced liver steatosis. RP-LC and HILIC in both ionisation modes were employed to analyse the liver samples (n = 40) from Wistar rats fed with a high-fat and high-fructose diet, supplemented or not with resveratrol and pterostilbene. After univariate and multivariate statistical analysis, 34 metabolites were highlighted in the different diets and elucidated. Despite the structural similarity, different alterations in liver metabolism were observed by the supplementations. Resveratrol treatment was characterised by the alteration in metabolism of 17 lysophospholipids, while pterostilbene affected some vitamins and derivatives, among others. IMS has demonstrated great potential in the elucidation process thanks to the additional structural descriptor the CCS (Å2), providing more confidence in the identification

Physiological pathways involved in nutritional muscle dystrophy and healing in European sea bass (Dicentrarchus labrax) larvae

The potential muscle regeneration after nutritional dystrophy caused by high dietary DHA contents in fish and the physiological pathways involved are still unknown. To better understand this process, an experiment was conducted for 3 weeks in 14 day-old European sea bass larvae using different DHA ratios (1 or 5%). After this period, part of the larvae fed 5% DHA diet was switched to 1% DHA diet ("wash-out") for another 2 weeks. Larvae fed 5% DHA diet showed altered oxidative status as indicated by the highest TBARS values, antioxidant enzymes (AOE) expression and incidence of muscular lesions. Accordingly, "washed-out" larvae showed lower dry weight and &alpha;-TOH content. IGF-I gene expression was elevated in 5% DHA larvae at 35 dph, suggesting increased muscle mitogenesis that was corroborated by the increase in myosin heavy chain expression. It can be concluded that high dietary DHA contents alter the oxidative status and cause muscular lesions in European sea bass larvae, with morphological and molecular aspects of mammalians muscular degenerative disease