1,021 research outputs found

    Analysis and Design of a Web-Based System for Order Management in a High School Institution

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    El mundo que habitamos ha permanecido en un ciclo de cambios importantes a nivel tecnológico. En este contexto, las instituciones que optan por la automatización de sus procesos mediante plataformas web no solo adquieren una ventaja en el ámbito tecnológico, sino que también se posicionan de manera destacada en términos competitivos. El proyecto se enfoca en la evaluación detallada y la conceptualización de una plataforma web. Esta plataforma tiene como objetivo principal la automatización integral del proceso de gestión de pedidos, específicamente aquellos realizados en la sede central, la cual funge como el epicentro coordinador de una extensa red de escuelas distribuidas a nivel estatal. Este proyecto se orienta hacia el análisis de un sistema web con el propósito no solo de optimizar el flujo de trabajo asociado con los pedidos, sino también de establecer una interfaz eficiente y unificada que sirva para las diversas instituciones educativas vinculadas. Para el desarrollo de este proyecto se adopta la metodología cascada y se abordan sus dos primera etapas (Análisis y diseño) en donde  se detallan principalmente los requisitos funcionales y no funcionales del sistema, mientras que para la investigación  se opta por elegir un enfoque cuantitativo, donde se recopilan datos e información para conocer el impacto que puede tener el proyecto, mediante el análisis de los datos recopilados, se generan estadísticas que cuantifican los beneficios del sistema web en cuestión.The world we inhabit has remained in a cycle of significant technological changes. In this context, institutions that choose to automate their processes through web platforms not only gain an advantage in the technological realm but also position themselves prominently in competitive terms.The project entitled "Analysis and Design of a Web System for Order Management in a High School Institution" focuses on the detailed evaluation and conceptualization of a web platform. This platform's main objective is the comprehensive automation of the order management process, specifically those made at the central headquarters, which serves as the coordinating epicenter for an extensive network of schools distributed at the state level. This project is oriented towards the analysis of a web system with the purpose not only of optimizing the workflow associated with orders but also of establishing an efficient and unified interface for the various linked educational institutions. The adopted methodology is based on a quantitative approach, where data and detailed information are collected to expand the impact panorama of this project. Through the analysis of the collected data, statistics are generated to support and quantify the benefits of the web system in question. These statistics not only support the project's approach but also provide an objective basis for evaluating the efficiency and effectiveness of the system compared to predefined metrics

    Hydrophobic Coatings for Corrosion Control of Aluminum Heat Exchangers

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    The production of thin films (nanocoatings) is a technological field with many applications to elaborate materials with new properties to be used as corrosion protection of traditional metals. Hydrophobicity is an example of such properties. In this chapter, an example of two hydrophobic corrosion coatings for possible use over aluminum heat exchanger geothermal power plants is discussed. Material substrate preparation, synthesis of hydrophobic sol‐gel nanocoating, characterization, and electrochemical evaluation as a function of time of immersion, which are compared to another commercial fluorinated compound, are presented. Good corrosion protection was found for both hydrophobic coatings for possible application in geothermal heat exchangers

    Effect of substrates formulated with organic materials on yielding, commercial and phytochemical quality, and benefit-cost ratio of tomato (Solanum lycopersicum L.) produced under greenhouse conditions

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    The objective of this study was to evaluate the effect of substrates formulated with different blends of sand-solarized manure and sand-vermicompost over yield, commercial and phytochemical quality of greenhouse tomatoes, and in addition to determine their benefit-cost (B/C) ratio for organic production of tomato. Six substrates were established consisting in blends of sand with 20, 30 or 40% of solarized manure (SM20, SM30 and SM40), and 20, 30 and 40% of vermicompost (VC20, VC30 and VC40), and control (TA) of sand fertilized with Steiner solution. Fruit yielding, commercial (fruit size, equatorial and longitudinal diameter, firmness, and soluble solids content), and nutraceutical quality (phenolic and lycopene content) were evaluated. In addition, cost-benefit (B/C) ratio of treatments was compared. Micro morphological analysis of the organic materials showed microscopic differences that could affect substrate functional properties. Substrate type affect yielding, and VC40 substrate had a higher yield than SM substrates, but SM20 had the highest phenolic and lycopene content in fruit, in addition to the highest cost-benefit production ratio (2.31). These results confirm that substrates formulated with blends of sand and either SM or VC can be used for organic production of tomato fruits with an adequate commercial and phytochemical quality without affecting yield, additionally to the economic advantages of such substrates for protected agriculture systems

    Mexican Validation of the MOS Questionnaire on Perceived Social Support in the Context of the COVID-19 Pandemic

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    Es un artículo científicoThe COVID-19 pandemic has had a very negative impact on people’s overall mental health and psychosocial well-being, but the study of available social support to cope with such an adverse situation has received hardly any attention. Objective: To examine the psychometric properties of the MOS Perceived Social Support Questionnaire among the Mexican population in the context of the COVID-19 pandemic. Method: Non-experimental cross-sectional study. A sociodemographic questionnaire and the Medical Outcomes Study were applied in a non-probabilistic sample. A total of 898 people from different regions in Mexico, 258 males and 640 females, participated in the study in the context of the COVID-19 pandemic. Results: The analysis yielded a bi-factor model with two factors, Emotional/informational support and Tangible support, with satisfactory goodness of fit indices. Reliability was adequate with a high hierarchical omega coefficient, as well as in the factors. Likewise, the H coefficient was adequate in the general factor and its dimensions. Conclusions: Results showed that the scale is a valid and reliable measure of perceived social support among the Mexican population

    Salud mental en población mexicana por COVID-19

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    Es un artículo científicoThe COVID-19 pandemic has had a significant negative impact on the mental health and psychosocial well-being of the general population, but little attention has been paid to the social support available to people to cope with such adverse conditions. Objective. To examine the psychometric properties of the MOS Perceived Social Support Questionnaire in the Mexican population in the context of the COVID-19 pandemic. Method. Non-experimental cross-sectional study. A sociodemographic questionnaire and the Medical Outcomes Study (MOS) were applied in a non-probabilistic sample. A total of 898 people from different regions of Mexico (Mage = 34.85, SD = 11.37, Females = 640, Males = 258) participated in the study. Results. The analysis yielded a bifactor model with two factors (F1. Emotional/informational support, F2. Tangible support) with satisfactory goodness of fit indices (χ2 = 486.36; df = 88; p = .000; RMSEA = .071 [IC90% .065 – .077]; SRMR = .02; CFI =.99; TLI =.99). Reliability was adequate with a high hierarchical omega coefficient (.95), as well as on the factors (F1 ωhs = .03, F2 ωhs = .28). Likewise, the H coefficient was adequate in the general factor and its dimensions (HHG = 98; Hhs = .28; Hhs = .56). Discussion and conclusion. Results showed that the scale is a valid and reliable measure of perceived social support in the Mexican population

    Caracteristicas reproductivas de ovejas Pelibuey sincronizadas e inducidas a la pubertad

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    El objetivo del experimento fue analizar las características reproductivas de ovejas Pelibuey sincronizadas (T1: n = 7) e inducidas a la pubertad (T2: n = 7). Las ovejas del T1 se presincronizaron, siete días después se aplicó a todas las ovejas FGA intravaginal durante 12 d y dos días antes de retirar el FGA se aplicó eCG. La incidencia de estro fue de 100 % en T1 y T2. El inicio del estro no fue diferente (P>0.05) con valores 21.4 ± 2.2 h y 24.2 ± 3.2 h para T1 y T2. La duración del estro fue de 60.5 ± 6.6 y 41.3 ± 3.6 para T1 y T2 (P<0.05). El inicio, duración y amplitud del pulso preovulatorio de LH no mostró diferencias con valores de 24.5 ± 1.7 y 24.2 ± 4.7 h, 13.4 ± 1.2 y 14.0 ± 0.6 h, 18.1 ± 2.7 y 21.3 ± 3.1 ng mL-1 para T1 y T2 respectivamente. La tasa de gestación no fue diferente con 100 y 85.71 % para T1 y T2. La tasa ovulatoria y prolificidad fue diferente (P<0.05) con valores de 4.4 ± 1.2 y 2.7 ± 0.4 y 2.5 ± 0.2 y 1.4 ± 0.4, para el T1 y T2 respectivamente. Se concluyó que el uso de FGA y eCG en ovejas Pelibuey es recomendable para inducir la pubertad, ya que las características reproductivas analizadas son aceptables, su implementación puede ser factible en programas de inseminación a tiempo fijo

    Aptitud combinatoria y heterosis en híbridos de líneas endogámicas de maíz/Combining ability and heterosis in hybrids from inbred lines corn

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    El trabajo se realizó en dos etapas, en la primera se formaron las cruzas en el campo experimental de la Universidad Autónoma Agraria Antonio Narro Unidad Laguna (UAAAN-UL), y en la segunda la evaluación en el campo experimental de la UAAAN-UL en los ciclos agrícola primavera y verano, y en el ejido Niágara, en el municipio de Aguascalientes, Aguascalientes, en primavera. El material genético fueron 17 líneas endogámicas, cuatro de la UAAAN-UL, dos del INIFAP y 11 del CIMMYT. El objetivo fue estimar la aptitud combinatoria general (ACG) de las líneas, la aptitud combinatoria especíca (ACE) y cuanticar los efectos genéticos y la heterosis de las cruzas. Para la ACG sobresalieron las líneas macho LAN-388P, LB-32 y LB-40, y las líneas hembras CML-319, CML-318 y CML-278; para la ACE los mayores valores lo tuvieron las cruzas LAN-123xCML-278 (3.28 t ha−1 ), LAN-123xCML-318 (1.9 t ha−1 ), LB-40xCML-319 (1.7 t ha−1 ) y LAN-388PxCML-264 (1.52 t ha−1 ). Mientras que el mayor rendimiento de grano, lo tuvieron las cruzas LB-40xCML-319 (14.49 t ha−1 ), LB-32xCML-319 (14.17 t ha−1 ), LAN-388PxCML-264 (13.68 t ha−1 ), LAN-123xCML-278 (13.55 t ha−1 ) y LAN-388PxCML-278 (13.44 t ha−1 ). La varianza de dominancia superó a la varianza aditiva en rendimiento de grano (RG) y en los principales componentes del rendimiento. Se encontraron efectos positivos de heterosis para rendimiento de grano con respecto al progenitor superior en las cruzas LB-40xCML-319 y LB-32 x CML-31

    Observation of the Rare Decay of the η Meson to Four Muons

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    A search for the rare η→μ+μ−μ+μ− double-Dalitz decay is performed using a sample of proton-proton collisions, collected by the CMS experiment at the CERN LHC with high-rate muon triggers during 2017 and 2018 and corresponding to an integrated luminosity of 101  fb−1. A signal having a statistical significance well in excess of 5 standard deviations is observed. Using the η→μ+μ− decay as normalization, the branching fraction B(η→μ+μ−μ+μ−)=[5.0±0.8(stat)±0.7(syst)±0.7(B2μ)]×10−9 is measured, where the last term is the uncertainty in the normalization channel branching fraction. This work achieves an improved precision of over 5 orders of magnitude compared to previous results, leading to the first measurement of this branching fraction, which is found to agree with theoretical predictions

    Muon identification using multivariate techniques in the CMS experiment in proton-proton collisions at (s)=13\sqrt{(s)} = 13 TeV

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    The identification of prompt and isolated muons, as well as muons from heavy-flavour hadron decays, is an important task. We developed two multivariate techniques to provide highly efficient identification for muons with transverse momentum greater than 10 GeV. One provides a continuous variable as an alternative to a cut-based identification selection and offers a better discrimination power against misidentified muons. The other one selects prompt and isolated muons by using isolation requirements to reduce the contamination from nonprompt muons arising in heavy-flavour hadron decays. Both algorithms are developed using 59.7 fb1^{-1} of proton-proton collisions data at a centre-of-mass energy of √(s)=13 TeV collected in 2018 with the CMS experiment at the CERN LHC

    Measurement of multijet azimuthal correlations and determination of the strong coupling in proton-proton collisions at s=13TeV\sqrt{s}=13\,\text {Te}\hspace{-.08em}\text {V}

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    A measurement is presented of a ratio observable that provides a measure of the azimuthal correlations among jets with large transverse momentum pT . This observable is measured in multijet events over the range of pT=360–3170 GeV based on data collected by the CMS experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 134 fb1^{−1} . The results are compared with predictions from Monte Carlo parton-shower event generator simulations, as well as with fixed-order perturbative quantum chromodynamics (pQCD) predictions at next-to-leading-order (NLO) accuracy obtained with different parton distribution functions (PDFs) and corrected for nonperturbative and electroweak effects. Data and theory agree within uncertainties. From the comparison of the measured observable with the pQCD prediction obtained with the NNPDF3.1 NLO PDFs, the strong coupling at the Z boson mass scale is αS_S(mZ_Z) = 0.1177 ± 0.0013 (exp)+0.01160.0073\frac {+0.0116}{−0.0073} (theo) = 0.1177+0.01170.0074\frac {+0.0117}{−0.0074} , where the total uncertainty is dominated by the scale dependence of the fixed-order predictions. A test of the running of αS_S in the TeV region shows no deviation from the expected NLO pQCD behaviour
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