1,307 research outputs found
Control of electric power microgrids: a hamiltonian approach
No full text[EN] In this paper the control problem of Power Microgrids is approached from the Passivity based Control perspective. The structure of a basic inner control scheme is proposed which guarantees that the variables associated to the power converters converge to prescribed values provided by a second control loop whose is in charge of a proper power sharing. Actually, three different alternatives for this second control scheme are presented. The presented results compose a compilation of previously reported contributions obtained under the passivity approach and they exploit at a fundamental level the fact that the model of the Microgrid under study exhibits a Port-controlled Hamiltonian system structure. In constrast with results frequently found in the literature, a formal (mathematical) proof for the stability properties of the presented schemes is provided. In addition, it is shown that the structure of the contributions holds with the requirements imposed in order to obtain an atractive practical implementation.[ES] En este trabajo se aborda el problema de control de Microrredes de potencia desde la perspectiva del Control Basado en Pasividad. Se presenta un esquema de control interno básico por medio del cual se garantiza que las variables asociadas a los convertidores de potencia tienden a valores de referencia pre-establecidos por un segundo esquema de control, el cual es responsable de un despacho de potencia adecuado. De manera específica, se presentan tres alternativas de diseño para este segundo tipo de control. Los resultados presentados son una compilación de propuestas hechas bajo el enfoque de pasividad y explotan la propiedad fundamental de que las redes estudiadas exhiben una estructura de sistema Hamiltoniano Controlado por Puerto. En contraste con resultados frecuentemente utilizados en la literatura, para las contribuciones presentadas se incluye la prueba formal (matemática) de sus propiedades de estabilidad. Adicionalmente, se muestra como la estructura de los esquemas propuestos satisfacen todos los requisitos impuestos para obtener una implementación práctica atractiva.Los resultados presentados en este trabajo han sido desarrollados en colaboración con la Dra. Sofía Ávila-Becerril, el Dr. Oscar Danilo Montoya, el Dr. Alejandro Garcés, el Dr. Juan Machado y el Dr. Isaac Ortega-Velázquez. El trabajo realizado por G. Espinosa-Pérez ha sido patrocinado por DGAPA-UNAM bajo el proyecto IN11801Espinosa-Pérez, G. (2022). Control de microrredes eléctricas de potencia: un enfoque hamiltoniano. Revista Iberoamericana de Automática e Informática industrial. 19(4):442-451. https://doi.org/10.4995/riai.2022.17020OJS442451194Agundis-Tinajero, G.,Segundo-Ramirez, J., Visairo-Cruz, N., Savaghebi, M., Guerrero, J.,Barocio, E., 2019. Power flow modeling of islanded AC microgrids with hierarchical control. International Journal of Electrical Power & Energy Systems 105, 28-36. https://doi.org/10.1016/j.ijepes.2018.08.002Alrayah Hassan, M., Yigang, H., 2020. Constant Power Load Stabilization in DC Microgrid Systems Using Passivity-Based Control With Nonlinear Disturbance Observer. IEEE Access 8, 92393-92406. https://doi.org/10.1109/ACCESS.2020.2992780Avila-Becerril, S., Espinosa-Perez, G., Fernandez, P., 2016. Dynamic Characterization of Typical Electrical Circuits via Structural Properties. Mathematical Problems in Engineering 2016. https://doi.org/10.1155/2016/7870462Avila-Becerril, S., Espinosa-Perez, G., Montoya, O., Garces, A., 2020. Passivity-based control of islanded microgrids with unknown power loads. IMA Journal of Mathematical Control and Information 37, 1548-1573. https://doi.org/10.1093/imamci/dnaa025Avila-Becerril, S., Espinosa-Perez, G., Machado, J., 2019. On the dynamic solution of power flow equations for microgrids control. IEEE 58th Conference on Decision and Control. https://doi.org/10.1109/CDC40024.2019.9029596Avila-Becerril, S., Espinosa-Perez, G., 2021. Control of islanded microgrids considering power converter dynamics. International Journal of Control 94, 2520-2530. https://doi.org/10.1080/00207179.2020.1713402Avila-Becerril, S., Espinosa-Perez, G., Machado, J., 2022. A Hamiltonian Control Approach for Electric Microgrids with Dynamic Power Flow Solution. AUTOMATICA. En prensa. https://doi.org/10.1016/j.automatica.2022.110192Bollobas, B., 2018. Modern graph theory. Springer Science & Business Media.Brayton, R., Moser, J., 1964. A theory of nonlinear networks I. Quarterly Applied Mathematics 22, 1-33. https://doi.org/10.1090/qam/169746Cisneros, R., Pirro, M., Bergna, G., Ortega, R., Ippoliti, G., Molinas, M., 2015. Global tracking passivity-based pi control of bilinear systems: Application to the interleaved boost and modular multilevel converters. Control Engineering Practice 43, 109-119. https://doi.org/10.1016/j.conengprac.2015.07.002Guerrero, J., Chandorkar, M., Lee, T., Loh, P., 2013. Advanced control architectures for intelligent microgrids, part I: decentralized and hierarchical control. IEEE Transactions on Industrial Electronics 60, 1254-1262. https://doi.org/10.1109/TIE.2012.2194969Guerrero, J., Kandari R. (Ed.), 2021. Microgrids: Modeling, Control, and Applications. Academic Press.Hart, P.J., Goldman, J., Lasseter, R.H., Jahns, T.M., 2020. Impact of Harmonics and Unbalance on the Dynamics of Grid-Forming, Frequency-DroopControlled Inverters. IEEE Journal of Emerging and Selected Topics in Power Electronics 8, 976-990. https://doi.org/10.1109/JESTPE.2019.2949303Han, H., Hou, X., Yang, J., Wu, J., Su, M., Guerrero, J., 2016. Review of power sharing control strategies for islanding operation of AC microgrids. IEEE Transactions on Smart Grid 7, 200-215. https://doi.org/10.1109/TSG.2015.2434849Khalil, H., 1996. Nonlinear systems. Prentice-Hall.Montoya, O., Gil-Gonzalez, W., Avila-Becerril, S., Garces, A., Espinosa-Perez, G., 2019. Integracion de REDs en Redes AC: una Familia de Controladores Basados en Pasividad. Revista Iberoamericana de Automatica e Informatica industrial 16, 212-221. https://doi.org/10.4995/riai.2018.10666Mujica, H., Espinosa-Perez, G., 2014. Control no lineal basado en pasividad de motores de induccion para alto desempeño dinamico. Revista Iberoamericana de Automatica e Informatica industrial 11, 32-43. https://doi.org/10.1016/j.riai.2013.08.001Mylvaganam, T., Ortega, R., Machado, J., Astolfi, A., 2018. Dynamic zero finding for algebraic equations. European Control Conference (ECC 2018). https://doi.org/10.23919/ECC.2018.8550185Ortega-Velazquez, I., Avila-Becerril, S., Espinosa-Perez, G., 2020. A Droop Approach for the Passivity-based Control of Microgrids. IFACPapersOnLine 53, 12962-12967. https://doi.org/10.1016/j.ifacol.2020.12.2137Ortega-Velazquez, I., Avila-Becerril, S., Espinosa-Perez, G., Ojeda, R., 2021. An improved passivity-based control for inverter-based Microgrids. Congreso Nacional de Control Automatico AMCA 2021.Ortega, R., Loria, A., Nicklasson, J., Sira-Ramirez, H., 2013. Passivity-based control of Euler-Lagrange systems: mechanical, electrical and electromechanical applications. Springer Science & Business Media.Ortega, R., Romero, J.G., Borja, P., Donaire, A., 2021. PID Passivity-Based Control of Nonlinear Systems with Applications. John Wiley Sons. https://doi.org/10.1002/9781119694199Rocabert, J., Luna, A., Blaabjerg, F., Rodriguez, P., 2012. Control of power converters in AC microgrids. IEEE Transactions on Power Electronics 27, 4734-4749. https://doi.org/10.1109/TPEL.2012.2199334Sepulchre, R., Jankovic, M., Kokotovic, P., 2012. Constructive nonlinear control. Springer Science & Business Media.Van del Schaft, A., 2017. L2-Gain and Passivity Techniques in Nonlinear Control. Springer International Publishing AG. https://doi.org/10.1007/978-3-319-49992-5Wellstead, P., 1979. Introduction to physical system modelling. Academic Press London.Zhong, Q., Hornik, T., 2013. Control of power inverters in Renewable energy and smart grid integration. Wiley. https://doi.org/10.1002/9781118481806Zhongwen, L., Chuanzhi, Z., Peng, Z., Haibin, Y., Shuhui, L., 2018. Fully Distributed Hierarchical Control of Parallel Grid-Supporting Inverters in Islanded AC Microgrids. IEEE Transactions on Industrial Informatics 14, 679-690. https://doi.org/10.1109/TII.2017.2749424Zonetti, D., Bergna-Diaz, G., Ortega, R., Monshizadeh, N., 2022. PID passivity-based droop control of power converters: Large-signal stability, robustness and performance. International Journal of Robust and Nonlinear Control 32, 1769-1795. https://doi.org/10.1002/rnc.591
Mapping of research on maternal health interventions in low- and middle-income countries: a review of 2292 publications between 2000 and 2012.
No full textBACKGROUND: Progress in achieving maternal health goals and the rates of reductions in deaths from individual conditions have varied over time and across countries. Assessing whether research priorities in maternal health align with the main causes of mortality, and those factors responsible for inequitable health outcomes, such as health system performance, may help direct future research. The study thus investigated whether the research done in low- and middle-income countries (LMICs) matched the principal causes of maternal deaths in these settings. METHODS: Systematic mapping was done of maternal health interventional research in LMICs from 2000 to 2012. Articles were included on health systems strengthening, health promotion; and on five tracer conditions (haemorrhage, hypertension, malaria, HIV and other sexually transmitted infections (STIs)). Following review of 35,078 titles and abstracts in duplicate, data were extracted from 2292 full-text publications. RESULTS: Over time, the number of publications rose several-fold, especially in 2004-2007, and the range of methods used broadened considerably. More than half the studies were done in sub-Saharan Africa (55.4 %), mostly addressing HIV and malaria. This region had low numbers of publications per hypertension and haemorrhage deaths, though South Asia had even fewer. The proportion of studies set in East Asia Pacific dropped steadily over the period, and in Latin America from 2008 to 2012. By 2008-2012, 39.1 % of articles included health systems components and 30.2 % health promotion. Only 5.4 % of studies assessed maternal STI interventions, diminishing with time. More than a third of haemorrhage research included health systems or health promotion components, double that of HIV research. CONCLUSION: Several mismatches were noted between research publications, and the burden and causes of maternal deaths. This is especially true for South Asia; haemorrhage and hypertension in sub-Saharan Africa; and for STIs worldwide. The large rise in research outputs and range of methods employed indicates a major expansion in the number of researchers and their skills. This bodes well for maternal health if variations in research priorities across settings and topics are corrected
Measurement of the t t ¯ H and tH production rates in the H → b b ¯ decay channel using proton-proton collision data at s = 13 TeV
No full textAbstract An analysis of the production of a Higgs boson (H) in association with a top quark-antiquark pair ( t t ¯ H ) or a single top quark (tH) is presented. The Higgs boson decay into a bottom quark-antiquark pair (H → b b ¯ ) is targeted, and three different final states of the top quark decays are considered, defined by the number of leptons (electrons or muons) in the event. The analysis utilises proton-proton collision data collected at the CERN LHC with the CMS experiment at s = 13 TeV in 2016–2018, which correspond to an integrated luminosity of 138 fb −1. The observed t t ¯ H production rate relative to the standard model expectation is 0.33 ± 0.26 = 0.33 ± 0.17(stat) ± 0.21(syst). Additionally, the t t ¯ H production rate is determined in intervals of Higgs boson transverse momentum. An upper limit at 95% confidence level is set on the tH production rate of 14.6 times the standard model prediction, with an expectation of 19.3 − 6.0 + 9.2 . Finally, constraints are derived on the strength and structure of the coupling between the Higgs boson and the top quark from simultaneous extraction of the t t ¯ H and tH production rates, and the results are combined with those obtained in other Higgs boson decay channels
CARMENES: High-resolution spectra and precise radial velocities in the red and infrared
No full textSPIE Astronomical Telescopes + Instrumentation (2018, Austin, Texas, United States)CSIC, Consejo Superior de Investigaciones Científicas; FEDER/ERF FICTS-2011-02, EGU, European Geosciences Union; MPG, Max-Planck-Gesellschaft; KTS, Klaus Tschira Stiftung; CSIC, Comisión Sectorial de Investigación Científica; MPG, Max-Planck-GesellschaftQuirrenbach, A., Amado, P.J., Ribas, I., Reiners, A., Caballero, J.A., Seifert, W., Aceituno, J., Azzaro, M., Baroch, D., Barrado, D., Bauer, F., Becerril, S., Bèjar, V.J.S., Benítez, D., Brinkmöller, M., Cardona Guillén, C., Cifuentes, C., Colomé, J., Cortés-Contreras, M., Czesla, S., Dreizler, S., Frölich, K., Fuhrmeister, B., Galadí-Enríquez, D. , González Hernández, J.I., González Peinado, R., Guenther, E.W., De Guindos, E. , Hagen, H.-J. , Hatzes, A.P. , Hauschildt, P.H., Helmling, J., Henning, T., Herbort, O., Hernández Castaño, L. , Herrero, E., Hintz, D., Jeffers, S.V., Johnson, E.N. , De Juan, E., Kaminski, A., Klahr, H., Kürster, M., Lafarga, M., Sairam, L. and Lampón, M. and Lara, L.M. and Launhardt, R. and López Del Fresno, M. and López-Puertas, M., Luque, R. , Mandel, H., Marfil, E.G., Martín, E.L., Martín-Ruiz, S., Mathar, R.J. , Montes, D. , Morales, J.C., Nagel, E. , Nortmann, L., Nowak, G., Pallé, E., Passegger, V.-M., Pavlov, A., Pedraz, S., Pérez-Medialdea, D. , Perger, M., Rebolo, R., Reffert, S. , Rodríguez, E., Rodríguez López, C. , Rosich, A. , Sabotta, S., Sadegi, S., Salz, M., Sánchez-López, A., Sanz-Forcada, J., Sarkis, P., Schäfer, S., Schiller, J., Schmitt, J.H.M.M. , Schöfer, P., Schweitzer, A., Shulyak, D., Solano, E., Stahl, O. , Tala Pinto, M., Trifonov, T., Zapatero Osorio, M.R., Yan, F., Zechmeister, M., Abellán, F.J., Abril, M., Alonso-Floriano, F.J., Ammler-Von Eiff, M., Anglada-Escudé, G., Anwand-Heerwart, H., Arroyo-Torres, B., Berdiñas, Z.M. , Bergondy, G., Blümcke, M. , Del Burgo, C., Cano, J., Carro, J., Cárdenas, M.C. , Casal, E., Claret, A., Díez-Alonso, E., Doellinger, M., Dorda, R., Feiz, C., Fernández, M. , Ferro, I.M., Gaisné, G., Gallardo, I., Gálvez-Ortiz, M.C. , García-Piquer, A. , García-Vargas, M.L., Garrido, R., Gesa, L. , Gómez Galera, V. , González-Álvarez, E. , González-Cuesta, L., Grohnert, S., Grözinger, U., Guàrdia, J., Guijarro, A., Hedrosa, R.P., Hermann, D., Hermelo, I., Hernández Arabí, R., Hernández Hernando, F., Hidalgo, D., Holgado, G., Huber, A., Huber, K., Huke, P., Kehr, M., Kim, M. , Klein, R., Klüter, J., Klutsch, A., Labarga, F. , Labiche, N., Lamert, A., Laun, W., Lázaro, F.J., Lemke, U. , Lenzen, R. , Llamas, M., Lizon, J.-L., Lodieu, N., López González, M.J., López-Morales, M., López Salas, J.F., López-Santiago, J., Magán Madinabeitia, H., Mall, U. , Mancini, L., Marín Molina, J.A., Martínez-Rodríguez, H., Maroto Fernández, D., Marvin, C.J. and Mirabet, E. and Moreno-Raya, M.E. and Moya, A. and Mundt, R. and Naranjo, V. and Ofir, A., Panduro, J., Pascual, J., Pérez-Calpena, A., Perryman, M.A.C., Pluto, M., Ramón, A., Redondo, P., Reinhart, S. , Rhode, P., Rix, H.-W., Rodler, F., Rohloff, R.-R. , Sánchez-Blanco, E. , Sánchez Carrasco, M.A., Sarmiento, L.F., Schmidt, C., Storz, C., Strachan, J.B.P., Stürmer, J., Suárez, J.C. , Tabernero, H.M. , Tal-Or, L., Tulloch, S.M., Ulbrich, R.-G., Veredas, G., Vico Linares, J.L., Vidal-Dasilva, M., Vilardell, F., Wagner, K., Winkler, J., Wolthoff, V. , Xu, W., Zhao, Z
Author Correction: A portrait of the Higgs boson by the CMS experiment ten years after the discovery
No full textIn the version of this article initially published, CMS Collaboration author names, affiliations and acknowledgements were omitted and have now been included in the HTML and PDF versions of the articl
Validation of microsatellite markers for cytotype discrimination in the model grass Brachypodium distachyon
No full textBrachypodium distachyon (2n = 2x = 10) is a small annual grass species where the existence of three different cytotypes (10, 20 and 30 chromosomes) has long been regarded as a case of autopolyploid series, with x = 5. However, it has been demonstrated that the cytotypes assumed to be polyploids represent two separate Brachypodium species recently named as B. stacei (2n = 2x = 20) and B. hybridum (2n = 4x = 30). The aim of this study was to find a PCR-based alternative approach that could replace standard cytotyping methods (i. e., chromosome counting and flow cytometry) to characterize each of the three Brachypodium species. We have analyzed with four microsatellite (SSR) markers eighty-three Brachypodium distachyon-type lines from varied locations in Spain, including the Balearic and Canary Islands. Within this set of lines, 64, 4 and 15 had 10, 20 and 30 chromosomes, respectively. The surveyed markers produced cytotype-specific SSR profiles. So, a single amplification product was generated in the diploid samples, with non-overlapping allelic ranges between the 2n = 10 and 2n = 20 cytotypes, whereas two bands, one in the size range of each of the diploid cytotypes, were amplified in the 2n = 30 lines. Furthermore, the remarkable size difference obtained with the SSR ALB165 allowed the identification of the Brachypodium species by simple agarose gel electrophoresis
Isoenergetic feeding of low carbohydrate-high fat diets does not increase brown adipose tissue thermogenic capacity in rats
No full textLow-carbohydrate, high-fat (LC-HF) diets are popular for inducing weight loss in overweighed adults. Adaptive thermogenesis increased by specific effects of macronutrients on energy expenditure has been postulated to induce this weight loss. We studied brown adipose tissue (BAT) morphology and function following exposure to different LC-HF diets.
Methods:
Male Wistar rats were fed a standard control diet ad libitum or pair-fed isoenergetic amounts of three experimental diets for 4 weeks. The diets had the following macronutrient composition (% metabolizable energy: carbohydrates, fat, protein): control (64.3/16.7/19), LC-HF-low protein (LC-HF-LP, 1.7/92.8/5.5), LC-HF-normal-protein (LC-HF-NP, 2.2/78.7/19.1), and a high fat diet with carbohydrates (“high fat”, 19.4/61.9/18.7).
Results:
Body weight gain was reduced in all pair-fed experimental groups as compared to rats fed the control diet, with more pronounced effect in rats on LC-HF diets than on the high fat diet with carbohydrates. High fat diets increased expression of PGC1α and ADRB3 in BAT indicating higher SNS outflow. However, UCP1 mRNA expression and expression of UCP1 assessed by immunohistochemistry was not different between diet groups. In accordance, analysis of mitochondrial function in-vitro by extracellular flux analyser (Seahorse Bioscience) and measurement of inducible thermogenesis in vivo (primary endpoint), explored by indirect calorimetry following norepinephrine injection, did not show significant differences between groups. Histology of BAT revealed increased lipid droplet size in rats fed the high-fat diet and both LC-HF diets.
Conclusion:
All experimental diets upregulated expression of genes which are indicative for increased BAT activity. However, the functional measurements in vivo revealed no increase of inducible BAT thermogenesis. This indicates that lower body weight gain with LC-HF diets and a high fat diet in a pair-feeding setting is not caused by increased adaptive thermogenesis in BAT
Search for CP violation in tH and tH production in multilepton channels in proton-proton collisions at = 13 TeV
No full textThe charge-parity (CP) structure of the Yukawa interaction between the Higgs (H) boson and the top quark is measured in a data sample enriched in the tt¯
H and tH associated production, using 138 fb−1 of data collected in proton-proton collisions at s√
= 13 TeV by the CMS experiment at the CERN LHC. The study targets events where the H boson decays via H → WW or H → ττ and the top quarks decay via t → Wb: the W bosons decay either leptonically or hadronically, and final states characterized by the presence of at least two leptons are studied. Machine learning techniques are applied to these final states to enhance the separation of CP -even from CP -odd scenarios. Two-dimensional confidence regions are set on κt and κ∼
t, which are respectively defined as the CP -even and CP -odd top-Higgs Yukawa coupling modifiers. No significant fractional CP -odd contributions, parameterized by the quantity |fHttCP
| are observed; the parameter is determined to be |fHttCP
| = 0.59 with an interval of (0.24, 0.81) at 68% confidence level. The results are combined with previous results covering the H → ZZ and H → γγ decay modes, yielding two- and one-dimensional confidence regions on κt and κ∼
t, while |fHttCP
| is determined to be |fHttCP
| = 0.28 with an interval of |fHttCP
| < 0.55 at 68% confidence level, in agreement with the standard model CP -even prediction of |fHttCP
| = 0
Contribución a la evaluación de la amenaza volcánica en el Campo Volcánico Monogenético Guamuez-Sibundoy, Nariño y Putumayo, Colombia
No full textFiguras, tablasEl Campo Volcánico Monogenético Guamuez-Sibundoy, ubicado en el límite entre los departamentos de Nariño y Putumayo, está conformado por 19 centros de emisión identificados hasta la fecha, en cercanías a poblaciones que albergan en conjunto cerca de 27.000 personas. Con el objetivo de evaluar la probabilidad espacial de la formación de nuevos centros eruptivos en el sector y establecer escenarios potenciales de actividad eruptiva futura, articularmente en relación con flujos de lava, se utilizó una metodología probabilística de largo plazo. Esto involucró la recopilación de datos geológicos, cartográficos, topográficos y meteorológicos, integrados en una base de datos geoespacial desarrollada en ArcGIS 10.8©. Los datos más relevantes para la evaluación de la probabilidad espacial incluyeron fallas, centros de emisión, actividad sísmica y manifestaciones hidrotermales, los cuales fueron subclasificados en subconjuntos y se les asignaron valores de importancia relativa mediante el método de Estimación del Juicio de Expertos (EJE). Posteriormente, se obtuvieron las Funciones de Densidad de Probabilidad (PDFs) de cada conjunto de datos mediante el plugin QVAST, permitiendo obtener un primer mapa de susceptibilidad del campo volcánico. Este mapa fue actualizado teniendo en cuenta la reciente actividad sísmica ocurrida en agosto de 2024. La simulación de escenarios de amenaza para flujos de lava se llevó a cabo a partir de los puntos con mayor valor de probabilidad obtenidos en cada mapa, utilizando el plugin Q-LavHA, sobre un DEM de 12,5 m de resolución. Los parámetros físicos de los flujos considerados para las simulaciones incluyen espesor, longitud y factores como la topografía y el perfil del terreno. Los resultados indicaron que la zona con mayor probabilidad de apertura de nuevos centros de emisión se encuentra al este de la Laguna de La Cocha, en cercanía a la mayor concentración de volcanes. Con respecto a las simulaciones de flujos de lava realizadas en los dos puntos de ambos mapas, se observaron dos trayectorias hacia el norestesureste y hacia el noroeste respectivamente, cada uno abarcando un área máxima de 6,1 km2 y 3,8 km2. Estos resultados destacan la importancia de definir el área con mayor probabilidad, ya que a su vez, esto conllevará un impacto diferente en las zonas a partir de donde se realizan las simulaciones de escenarios eruptivos. Asimismo, estos resultados permiten pronosticar los posibles impactos de la actividad eruptiva en el área, proporcionando una base sólida para la gestión del riesgo y la planificación de medidas preventivas.The Guamuez-Sibundoy Monogenetic Volcanic Field, located between the departments of Nariño and Putumayo, consists of 19 emission centers identified to date, near populations that collectively amount to around 27,000 people. To assess the spatial probability of vent formation in the area and to establish potential scenarios for future eruptive activity, particularly regarding lava flows, a long-term probabilistic methodology was used. This involved compiling geological, cartographic, topographic, and meteorological data, integrated into a geospatial database in ArcGIS 10.8©. The most relevant data used in the spatial probability assessment included faults, vents, seismic activity, and hydrothermal manifestations, which were sub-classified into datasets and assigned relative importance values through Expert Judgment Elicitation (EJE). Subsequently, Probability Density Functions (PDFs) for each dataset were obtained using QVAST to obtain an initial susceptibility map of the volcanic field. This map was updated to account for recent seismic activity in August 2024. Hazard scenario simulations for lava flows were carried out based on the points with the highest probability values in each susceptibility map, using Q-LavHA and a 12.5 m resolution DEM. The physical parameters of the flows considered for the simulations included thickness, length, and factors such as topography and elevation profile. The results indicated that the area with the highest spatial probability of vent opening is located east of La Cocha Lake, near the main cluster of emission centers. Regarding the lava flow simulations conducted at two points from both maps, two trajectories were observed: one toward the northeast-southeast and the other toward the northwest, each covering a maximum area of 6.1 km² and 3.8 km², respectively. These results highlight the importance of defining the area with the highest probability, as this will, in turn, have a distinct impact on the areas where eruptive scenario simulations are carried out. Moreover, these results allow the forecasting of potential impacts of eruptive activity in the area, providing a solid basis for risk management and preventive planning.Introducción/ Objetivos/ Objetivo general / Objetivos específicos / Localización / Vías de acceso / Marco geológico / Contexto tectónico / Geología regional / Geología estructural / Sistema de Fallas Algeciras / Fallas asociadas al Sistemas de Fallas Algeciras /Campo Volcánico Monogenético Guamuez-Sibundoy (CVMGS) / Composición / Morfología / Temporalidad / Control estructural / Marco teórico / Amenaza volcánica en campos volcánicos monogenéticos / Metodología probabilística de largo plazo / Base de datos vulcanológica / Análisis de la susceptibilidad volcánica / Caracterización volcano-estructural / Método Analítico Jerárquico y la Estimación de Juicio de Expertos / Cálculo de Funciones de Densidad de Probabilidad (PDFs) / Función kernel Gaussiana y ancho de banda “h” / Susceptibilidad volcánica con QVAST / Análisis de la probabilidad temporal / Escenarios eruptivos / Q-LavHA y el modelamiento de flujos de lava / Metodología / Recopilación de información geológica y base de datos del CVMGS / Análisis de la susceptibilidad volcánica / Subclasificación de conjuntos de datos / Estimación del Juicio de Expertos (EJE) / QVAST y mapa de susceptibilidad / Simulación de escenarios de amenaza: flujos de lava Q-LavHA / Resultados / Levantamiento de la información y base de datos / Base de datos del CVMGS / Bibliografía / Cartografía / Geocronología / Geoquímica / Manifestaciones hidrotermales / Laboratorio / Litología / Meteorología / Sismicidad / Análisis de la susceptibilidad volcánica / Análisis y subclasificación de la información / Elementos volcánicos / Elementos estructurales / Actividad sísmica / Manifestaciones hidrotermales / Estimación del Juicio de Expertos (EJE) del CVMGS / Diseño de la matriz de valores de importancia relativa / Ponderación de pesos y cálculo del Índice de Consistencia (IC) / QVAST y generación del mapa de susceptibilidad / Ancho de banda y Funciones de Densidad de Probabilidad (PDFs) / Mapa de susceptibilidad final / Actualización del mapa de susceptibilidad del CVMGS /Simulación de escenarios eruptivos en el CVMGS / Parámetros para la simulación de flujos de lava / Simulación de flujos de lava desde el primer píxel central (PC1) / Simulación de flujos de lava desde el segundo píxel central (PC2) / Discusión / Mapa de susceptibilidad y ubicación de futuros centros eruptivos en el CVMGS / Implicaciones de la ubicación del centro eruptivo y la topografía / Potencial impacto por futura actividad volcánica en el CVMGS / Relevancia de la evaluación de la amenaza volcánica en el CVMGS / Medidas de prevención ante potencial amenaza volcánica en el CVMGS / Conclusiones /BibliografíaPregradoGeólogo(a)Vulcanologí
Search for γ H production and constraints on the Yukawa couplings of light quarks to the Higgs boson
No full textA search for γH production is performed with data from the CMS experiment at the LHC corresponding to an integrated luminosity of 138 fb−1 at a proton-proton center-of-mass collision energy of 13 TeV. The analysis focuses on the topology of a boosted Higgs boson recoiling against a high-energy photon. The final states of H →b ̄b
and H →4l are analyzed. This study examines effective HZγ and Hγγ anomalous couplings within the context of an effective field theory. In this approach, the production cross section is constrained to be σγH <16.4 fb
at 95% confidence level (CL). Simultaneous constraints on four anomalous couplings involving HZγ and Hγγ
are provided. Additionally, the production rate for H →4l is examined to assess potential enhancements in the Yukawa couplings between light quarks and the Higgs boson. Assuming the standard model values for the Yukawa couplings of the bottom and top quarks, the following simultaneous constraints are obtained: κu =(0.0 ±1.5) ×103, κd =(0.0+6.7
−6.8) ×102, κs =0+30−32 , and κc =0.0+2.3 −2.8. This rules out the hypothesis that up- or down-type quarks in the first or second generation have the same Yukawa couplings as those in the third generation, with a CL greater than 95%
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