Utilisation de modèles linéaires généralisés pour évaluer les stratégies de pêche thonière à la senne en présence d'espèces associées dans l'Atlantique ouest

Les stratégies de pêche, développées par les capitaines des thoniers senneurs vénézuéliens dans la mer des Caraïbes, reposent sur la recherche d'indices visuels indiquant la présence de thons à la surface de l'océan. Une fois que la détection est réalisée, le senneur peut choisir la tactique qui consiste à demander l'aide d'un thonier canneur (pêche à l'appât vivant) afin d'augmenter le taux de réussite d'un coup de senne. Pour prendre en compte la variabilité de différents facteurs, comme la saison, les indices de détection associés aux bancs, l'aide du thonier canneur, les espèces de thons et le poids moyen des poissons présents dans le banc, les probabilités de réalisation de certains événements sont estimées à l'aide de la modélisation Logit, issue de modèles Log-linéaires. Les probabilités de capturer des bancs de gros individus sont maximales lorsque l'albacore est l'espèce dominante et que la pêche a lieu sur banc libre ou sur requin-baleine ; cet effet est d'autant plus marqué en saison sèche. En revanche, si le listao est l'espèce dominante, la probabilité de capturer des gros individus est faible, en particulier lorsque la pêche est réalisée sur des baleines. Les résultats de cette modélisation sont intégrés dans un arbre de décision. Si on retient le critère de l'espérance mathématique des gains potentiels, l'aide du thonier canneur ne semble pas être la meilleure des tactiques possibles. Pourtant son impact est positif sur le taux de réussite d'un coup de senne, puisque le pourcentage de calées positives passe de 58% sans aide à 85% avec aide. L'efficacité de cette aide dépend du type d'association rencontré. Elle augmente lorsqu'il s'agit de bancs libres ou en association avec des baleines, mais diminue lorsque le banc est associé à un requin-baleine... (D'après résumé d'auteur

HNL mass degeneracy: implications for low-scale seesaws, LNV at colliders and leptogenesis

Low-scale seesaw variants protected by lepton number symmetry provide a natural explanation of the smallness of neutrino masses but, unlike their higher-scale counterparts, with potentially testable phenomenology. The approximate lepton number symmetry arranges the heavy neutrinos in pseudo-Dirac pairs, which might be accessible at collider or even beam dump experiments if their mass is low enough and their mixing with the active neutrinos sufficiently large. Despite their pseudo-Dirac nature, their small mass splittings may lead to oscillations that prevent the cancellation of their potential lepton-number-violating signals. Interestingly, these small splittings may also resonantly enhance the production of a lepton number asymmetry for low-scale leptogenesis scenarios or, for extremely degenerate states, lead to an asymmetry large enough to resonantly produce a keV sterile neutrino dark matter candidate with the correct relic abundance via the Shi-Fuller mechanism. In this work we explore the parameter space of the different low-scale seesaw mechanisms and study the size of these splittings, given their important and interesting phenomenological consequences. While all low-scale seesaw variants share the same dimension 5 and 6 operators when integrating out the heavy states, we point out that the mass splitting of the pseudo-Dirac pairs are very different in different realizations such as the inverse or linear seesaw. This different phenomenology could offer a way to discriminate between low-scale seesaw realizations.Comment: 27 pages, 6 figures. Matches published version in JHE

The color project under flow diagram: the University City of Caracas and Carlos Raúl Villanueva

[EN] For the avant-garde of the 20th century, colors were identified with vitality and luminosity, among other aspects. In Europe they were investigated plastically in the urban space by Futurist Architecture and Piero Bottoni s Chromatism Architettonico. Color was assigned a fundamental role in the ideology of the integration of the arts in architecture, being the University City of Caracas an exceptional exponent. The intention is to demonstrate that the flow diagram designed by Carlos Raúl Villanueva for his Conjunto Central is an effective method of analysis, projection and graphic expression of color in spacetime. Universally applicable, it is a valid instrument for the project of a color that takes values of constructive and plastic position to incorporate the chromaticity of the time of space.[ES] Para las vanguardias del siglo XX los colores se identificaban con vitalidad y luminosidad, entre otros aspectos. En Europa los investigaron plásticamente en el espacio urbano la Arquitectura Futurista y el Cromatismo Architettonico de Piero Bottoni. Al color le asignaron un rol fundamental en el ideario de la integración de las artes en la arquitectura, siendo la Ciudad Universitaria de Caracas un exponente excepcional. Se pretende demostrar que el diagrama de flujos que diseñó Carlos Raúl Villanueva para su Conjunto Central es un método eficaz de análisis, proyección y expresión gráfica del color en el espaciotiempo. De aplicación universal, es instrumento válido para el proyecto de un color que toma valores de posición constructiva y plástica para incorporar la cromaticidad del tiempo del espacio.Danés Grases, D.; Marcano Requena, F.; Pizarro Juanas, MJ.; Ibañez Montoya, J. (2023). El proyecto del color bajo diagrama de flujos: la Ciudad Universitaria de Caracas y Carlos Raúl Villanueva. EGA Expresión Gráfica Arquitectónica. 28(49):224-237. https://doi.org/10.4995/ega.2023.15861224237284

Bounds on lepton non-unitarity and heavy neutrino mixing

We present an updated and improved global fit analysis of current flavor and electroweak precision observables to derive bounds on unitarity deviations of the leptonic mixing matrix and on the mixing of heavy neutrinos with the active flavours. This new analysis is motivated by new and updated experimental results on key observables such as $V_{ud}$, the invisible decay width of the $Z$ boson and the $W$ boson mass. It also improves upon previous studies by considering the full correlations among the different observables and explicitly calibrating the test statistic, which may present significant deviations from a $\chi^2$ distribution. The results are provided for three different Type-I seesaw scenarios: the minimal scenario with only two additional right-handed neutrinos, the next to minimal one with three extra neutrinos, and the most general one with an arbitrary number of heavy neutrinos that we parametrize via a generic deviation from a unitary leptonic mixing matrix. Additionally, we also analyze the case of generic deviations from unitarity of the leptonic mixing matrix, not necessarily induced by the presence of additional neutrinos. This last case relaxes some correlations among the parameters and is able to provide a better fit to the data. Nevertheless, inducing only leptonic unitarity deviations avoiding both the correlations implied by the right-handed neutrino extension as well as more strongly constrained operators is challenging and would imply significantly more complex UV completions.Comment: 27 pages + appendices, 7 figures, 7 table

A Study of Outcomes Following Collaborative Medical Doctor/Physical Therapist Primary Care Service for Musculoskeletal Problems

Background and Purpose: Collaborative medical doctor/physical therapist primary care services are not described in the literature. The 2 purposes of this observational study were to describe a collaborative medical doctor/physical therapist primary care service, and to describe simple, one question, outcomes including patient acceptable symptom state (PASS), global rating of normal function (GRNF), and success of treatment (SOT) at intake, 1 to 7 days, and 45 to 60 days follow-up. Methods: Patients were seen for 1 to 2 visits and typically received exercise, hands on treatment, ie, manual therapy, and education. Medical doctor/physical therapist collaborative encounters and provider training are described. Outcome measures were recorded at the first visit, via phone once between 1 to 7 days and once between 45 to 60 days. Descriptive data was calculated at each time point. Findings: Examples of collaborative diagnosis and treatment opportunities are tabulated. A total of 31.9% of patients were PASS Yes at intake (n=402). At 1 to 7 days (n=157; 50.3%) and 45 to 60 days (n=93; 55.9%), the proportion of PASS Yes patients were higher. There was little difference in the GRNF scale at any follow-up. At 45 to 60 days, the SOT question indicated most patients (45.7%) reported “improved” and 29.3% of patients reported as “partly cured” or “cured.” Clinical Relevance: Collaborative opportunities for diagnosis and treatment in primary care are provided. A model using the PASS, GRNF, and SOT questions for judging the urgency which a service needs modification to meet patient needs is proposed. Conclusion: A collaborative medical doctor/physical therapist model is a viable option to improve primary care services. This descriptive data suggests some level of success, however, there is little relevant data for comparison

Predicting Patients Acceptable Symptom State at Short Term Follow Up of a Collaborative Primary Care PT/MD Service

Hypothesis: Patient Reported Outcome Tools will predict a patient’s acceptable symptom state (PASS

Bounds on lepton non-unitarity and heavy neutrino mixing

We present an updated and improved global fit analysis of current flavour and electroweak precision observables to derive bounds on unitarity deviations of the leptonic mixing matrix and on the mixing of heavy neutrinos with the active flavours. This new analysis is motivated by new and updated experimental results on key observables such as Vud, the invisible decay width of the Z boson and the W boson mass. It also improves upon previous studies by considering the full correlations among the different observables and explicitly calibrating the test statistic, which may present significant deviations from a χ 2 distribution. The results are provided for three different Type-I seesaw scenarios: the minimal scenario with only two additional right-handed neutrinos, the next to minimal one with three extra neutrinos, and the most general one with an arbitrary number of heavy neutrinos that we parametrise via a generic deviation from a unitary leptonic mixing matrix. Additionally, we also analyze the case of generic deviations from unitarity of the leptonic mixing matrix, not necessarily induced by the presence of additional neutrinos. This last case relaxes some correlations among the parameters and is able to provide a better fit to the data. Nevertheless, inducing only leptonic unitarity deviations avoiding both the correlations implied by the right-handed neutrino extension as well as more strongly constrained operators is challenging and would imply significantly more complex UV completionsThis project has received support from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 860881-HIDDeN and No 101086085 - ASYMMETRY, and from the Spanish Research Agency (Agencia Estatal de Investigación) through the Grant IFT Centro de Excelencia Severo Ochoa No CEX2020-001007-S and Grant PID2019-108892RB-I00 funded by MCIN/AEI/10.13039/501100011033. EFM, XM and DNT acknowledge support from the HPC-Hydra cluster at IFT. XM acknowledges funding from the European Union’s Horizon Europe Programme under the Marie Skłodowska-Curie grant agreement no. 101066105-PheNUmenal. The work of DNT was supported by the Spanish MIU through the National Program FPU (grant number FPU20/05333). JLP also acknowledges support from Generalitat Valenciana through the plan GenT program (CIDEGENT/2018/019) and from the Spanish Ministerio de Ciencia e Innovacion through the project PID2020-113644GB-I0

Primer reporte de cepas de Enterobacter spp productoras de metalobetalactamasas de Venezuela

Clinical strains of Enterobacter were isolated from Cumana's Central Hospital in Venezuela, and classified as E. cloacae (21), E. aerogenes (7), E. intermedium (1), E. sakazakii (1) and three unclassified. The strains showed high levels of resistance, especially to SXT (58.1%), CRO (48.8%), CAZ (46.6%), PIP (46.4%), CIP (45.2%) and ATM (43.3%). This is the first report for South America of blaVIM-2 in two E. cloacae and one Enterobacter sp., which also showed multiple mechanisms of resistance. Both E. cloacae showed blaTEM-1, but only one showed blaCTX-M-15 gene, while no blaSHV was detected.Cepas clínicas de Enterobacter fueron aisladas del Hospital central de Cumaná en Venezuela, y se clasificaron como E. cloacae (21), E. aerogenes (7), E. intermedium (1), E. sakazakii (1) y 3 sin clasificar. Las cepas mostraron altos niveles de resistencia, especialmente a SXT (58.1%), CRO (48.8%), CAZ (46.6%), PIP (46.4%), CIP (45.2%) and ATM (43.3%). Este es el primer reporte de América del Sur de blaVIM-2 en dos cepas de E. cloacae y una de Enterobacter sp., las cuales también mostraron múltiples mecanismos de resistencia. Ambas especies de E. cloacae mostraron genes blaTEM-1, pero solo una mostro el gen blaCTX-M-15, mientras que blaSHV no fue detectado

Social Responsibility: Sustainable dimension towards the environment of coal companies in Colombia and Venezuela

The purpose of this article is to analyze social responsi-bility as a sustainable dimension towards the environ-ment in coal companies in Colombia and Venezuela. The research was of an analytical and descriptive type, using the technique of documentary review through the consultation of printed and electronic sources, highlight-ing among the sources consulted the researches of Daza and Pinedo, Moncada, Solano, Paz and others, Soto and Cárdenas, Guédez and Kliksberg, for the great interest given in recent years to social responsibility in the sec-tor, demonstrated by the number of theses and articles developed. It was evidenced how the coal companies in Colombia and Venezuela promote social responsibility through the management of their work processes with a sense of commitment to sustainable development, where it is not enough to practice social activities, but it is ex-ercised responsibility with them, their people and the environment, to generate a social and environmental commitment, shared with stakeholders from the ethical principles promoted in their raison d'être, in addition to encouraging voluntary participation, in order to promote the welfare of the social group in the environment, for the construction of healthy societies.El propósito de este artículo es analizar la responsabilidad social como una dimensión sustentable hacia el ambiente en empresas carboníferas de Colombia y Venezuela. La investigación fue de tipo analítica y descriptiva, utilizando la técnica de revisión documental para a través de la consulta de fuentes impresas y electrónicas, destacando entre las fuentes consultadas las investigaciones de Daza y Pinedo, Moncada, Solano, Paz y otros, Soto y Cárdenas, Guédez y Kliksberg, por el gran interés otorgado en los últimos años a la responsabilidad social en el sector, hecho demostrado por la cantidad de tesis y artículos desarrollados. Se evidenció como las empresas carboníferas en Colombia y Venezuela promueven la responsabilidad social mediante la gestión de sus procesos de trabajo con un sentido de compromiso hacia el desarrollo sustentable, donde no es suficiente con la práctica de actividades sociales, sino se ejerce la responsabilidad con ellas, su gente y el ambiente, para generar un compromiso social y ambiental, compartido con los grupos de interés desde los principios ético promovidos en su razón de ser; además, del fomento de la participación voluntaria, a fin de impulsar el bienestar del colectivo social en el entorno, en pro de la construcción de sociedades sanas

Is it necessary to show virtual limbs in action observation neurorehabilitation systems?

Action observation neurorehabilitation systems are usually based on the observation of a virtual limb performing different kinds of actions. In this way, the activity in the frontoparietal Mirror Neuron System is enhanced, which can be helpful to rehabilitate stroke patients. However, the presence of limbs in such systems might not be necessary to produce mirror activity, for example, frontoparietal mirror activity can be produced just by the observation of virtual tool movements. The objective of this work was to explore to what point the presence of a virtual limb impacts the Mirror Neuron System activity in neurorehabilitation systems.info:eu-repo/semantics/publishedVersio