DYNAMICS AND ENTANGLEMENT OF A QUANTUM DOT-CAVITY SYSTEM COUPLED BY A NON-LINEAR OPTICAL INTERACTION

We propose a simple theoretical model for a dissipative quantum dot-microcavity system interacting with a non-linear optical interaction. The Lindblad master equation formalism is considered to study the full dynamics for both weak and strong coupling regimes. The photoluminescence spectra of the system at the stationary limit is calculated in an exact form, and the effect due to non-linear optical interaction is explicitly evidenced. The entanglement of the system is calculated, and we found revivals and sudden death are evidenced. We also study the relationship between the light-matter and non-linear optical interaction terms by calculating the average photon number.Se propone un modelo teórico sencillo para un sistema disipativo de punto cuántico-microcavidad que interactúan a través de una interacción óptica no lineal. El formalismo de la ecuación maestra en la forma de Lindblad es considerado para estudiar la dinámica del sistema en los regímenes de acoplamiento débil y fuerte, respectivamente. El espectro de fotoluminiscencia del sistema en el límite estacionario es calculado en forma exacta, y se muestra el efecto de la interacción óptica no lineal explícitamente sobre éste. Se calcula el entrelazamiento del sistema, y se encuentra resurgimientos y muerte s\'ubita del entrelazamiento. Adicionalmente, se estudia la relación entre los términos de interacción luz-materia (Jaynes-Cummings) e interacción óptica no lineal (medio Kerr) por medio del número medio de fotones

Prospective study of factors associated with asthma attack recurrence (ATTACK) in children from three Ecuadorian cities during COVID-19: a study protocol.

INTRODUCTION Asthma is a growing health problem in children in marginalised urban settings in low-income and middle-income countries. Asthma attacks are an important cause of emergency care attendance and long-term morbidity. We designed a prospective study, the Asthma Attacks study, to identify factors associated with recurrence of asthma attacks (or exacerbations) among children and adolescents attending emergency care in three Ecuadorian cities. METHODS AND ANALYSIS Prospective cohort study designed to identify risk factors associated with recurrence of asthma attacks in 450 children and adolescents aged 5-17 years attending emergency care in public hospitals in three Ecuadorian cities (Quito, Cuenca and Portoviejo). The primary outcome will be rate of asthma attack recurrence during up to 12 months of follow-up. Data are being collected at baseline and during follow-up by questionnaire: sociodemographic data, asthma history and management (baseline only); recurrence of asthma symptoms and attacks (monthly); economic costs of asthma to family; Asthma Control Test; Pediatric Asthma Quality of life Questionnaire; and Newcastle Asthma Knowledge Questionnaire (baseline only). In addition, the following are being measured at baseline and during follow-up: lung function and reversibility by spirometry before and after salbutamol; fractional exhaled nitric oxide (FeNO); and presence of IgG antibodies to SARS-CoV-2 in blood. Recruitment started in 2019 but because of severe disruption to emergency services caused by the COVID-19 pandemic, eligibility criteria were modified to include asthmatic children with uncontrolled symptoms and registered with collaborating hospitals. Data will be analysed using logistic regression and survival analyses. ETHICS AND DISSEMINATION Ethical approval was obtained from the Hospital General Docente de Calderon (CEISH-HGDC 2019-001) and Ecuadorian Ministry of Public Health (MSP-CGDES-2021-0041-O N° 096-2021). The study results will be disseminated through presentations at conferences and to key stakeholder groups including policy-makers, postgraduate theses, peer-review publications and a study website. Participants gave informed consent to participate in the study before taking part

Los 'fueguinos', Robert Lehmann-Nitsche y el estudio de los onas en la Exposición Nacional de Buenos Aires (1898)

Entre los primeros trabajos del antropólogo alemán Robert Lehmann-Nitsche como jefe del Departamento de Antropología del Museo de La Plata, Argentina, se cuentan las investigaciones sobre los habitantes de Tierra del Fuego, considerados como un 'relicto' evolutivo de la humanidad. Se repasa la importancia de las ferias y exposiciones como espacios de popularización científica y de 'trabajo de campo' para los estudiosos de fines del siglo XIX y principios del XX. Se examina la presentación de los 'fueguinos' en los espacios de las ferias y exposiciones europeas, los debates, los estudios realizados en Europa y el trabajo de Robert Lehmann-Nitsche en la Exposición Nacional de la Industria Argentina (Buenos Aires, 1898).Among the first projects of German anthropologist Robert Lehmann-Nitsche as head of the Museum de La Plata's Department of Anthropology in Argentina was his research on the inhabitants of Tierra del Fuego, deemed evolutionary 'relics' of humanity. The article explores the role of shows and exhibits as spaces where science was popularized and where late nineteenth- and early twentieth-century scholars could do field work. The focus is on the presentation of 'fueguinos' at European shows and exhibits, debates, and studies, especially the work of Robert Lehmann-Nitsche at the National Exhibit of Argentinean Industry, held in Buenos Aires, 1898

Anales del III Congreso Internacional de Vivienda y Ciudad "Debate en torno a la nueva agenda urbana"

Acta de congresoEl III Congreso Internacional de Vivienda y Ciudad “Debates en torno a la NUEVa Agenda Urbana”, ha sido una apuesta de alto compromiso por acercar los debates centrales y urgentes que tensionan el pleno ejercicio del derecho a la ciudad. Para ello las instituciones organizadoras (INVIHAB –Instituto de Investigación de Vivienda y Hábitat y MGyDH-Maestría en Gestión y Desarrollo Habitacional-1), hemos convidado un espacio que se concretó con potencia en un debate transdisciplinario. Convocó a intelectuales de prestigio internacional, investigadores, académicos y gestores estatales, y en una metodología de innovación articuló las voces académicas con las de las organizaciones sociales y/o barriales en el Foro de las Organizaciones Sociales que tuvo su espacio propio para dar voz a quienes están trabajando en los desafíos para garantizar los derechos a la vivienda y los bienes urbanos en nuestras ciudades del Siglo XXI

DYNAMICS AND ENTANGLEMENT OF A QUANTUM DOT-CAVITY SYSTEM COUPLED BY A NON-LINEAR OPTICAL INTERACTION

We propose a simple theoretical model for a dissipative quantum dot-microcavity system interacting with a non-linear optical interaction. The Lindblad master equation formalism is considered to study the full dynamics for both weak and strong coupling regimes. The photoluminescence spectra of the system at the stationary limit is calculated in an exact form, and the effect due to non-linear optical interaction is explicitly evidenced. The entanglement of the system is calculated, and we found revivals and sudden death are evidenced. We also study the relationship between the light-matter and non-linear optical interaction terms by calculating the average photon number.Se propone un modelo teórico sencillo para un sistema disipativo de punto cuántico-microcavidad que interactúan a través de una interacción óptica no lineal. El formalismo de la ecuación maestra en la forma de Lindblad es considerado para estudiar la dinámica del sistema en los regímenes de acoplamiento débil y fuerte, respectivamente. El espectro de fotoluminiscencia del sistema en el límite estacionario es calculado en forma exacta, y se muestra el efecto de la interacción óptica no lineal explícitamente sobre éste. Se calcula el entrelazamiento del sistema, y se encuentra resurgimientos y muerte s\'ubita del entrelazamiento. Adicionalmente, se estudia la relación entre los términos de interacción luz-materia (Jaynes-Cummings) e interacción óptica no lineal (medio Kerr) por medio del número medio de fotones

DINÁMICA Y ENTRELAZAMIENTO DE DOS PUNTOS CUÁNTICOS INTERACTUANTES EN UNA NANO-CAVIDAD POR MEDIO DE ASISTENCIA FONÓNICA

Se propone un modelo teórico para estudiar la dinámica de un sistema de dos puntos cuánticos embebidos en una nanocavidad, los cuales interactúan a través de los acoples tipo Förster, interacción dipolar y asistencia fonónica. El modelo incorpora las pérdidas de fotónes, creación y emisión espontánea de excitónes por medio del formalismo de la ecuación maestra en la forma de Lindblad. Se encuentra que la dinámica del sistema es fuertemente influenciada por las interacciones tipo Förster y fonónica, lo cual es evidenciado en los elementos diagonales de la matriz densidad y las relaciones de dispersión del sistema. Se cuantifica el entrelazamiento del sistema por medio de la concurrencia y se observa que la interacción Förster favorece el entrelazamiento en el régimen de alta excitación, contrario al efecto inducido por la asistencia fonónica que tiende a reducirlo.We propose a theoretical model for studying the dynamics of two-quantum dots system embeded in a nanocavity, which are coupled by Förster, dipolar interactions and the phonon assisted cavity feeding. The model takes into account photons looses, pumping and spontaneous emission of excitons via the Lindblad master equation formalism. The dynamics of the system is strongly influenced by the Förster and phononic interactions, and it is evidenced in the diagonal elements of the density matrix and the dispersion relation of the system. The entanglement of the system is quantified by the concurrence, and it is shown that the Förster interaction improves the entanglement in high excitation regime, in contrast to the effect due to the phonon assisted cavity feeding that tends to reduce it

Percutaneous ethanol injection therapy in post-transplant patients with secondary hyperparathyroidism

Persistent hyperparathyroidism is frequent in postrenal transplant patients. Percutaneous ethanol injection therapy (PEIT) is an alternative for treatment of patients with secondary hyperparathyroidism but it was not described in postrenal transplant patients. We report our experience with PEIT to control hyperparathyroidism in the post-transplant period. We performed PEIT under ultrasonographic guidance and local anesthesia in eight patients because of persistent secondary hyperparathyroidism after renal transplantation. Indications for PEIT were: high intact parathyroid hormone (iPTH) levels with hypercalcemia, hypophosphatemia, osteopenia and/or bone pain. All patients had at least one visible parathyroid nodule by ultrasonography. Biochemical assays were performed immediately before PEIT, between 1 and 7 days after last PEIT, and a mean of 8.0 ± 2.8 months after PEIT. Serum iPTH and calcium levels decreased significantly after treatment and remained unchanged until final control. Serum iPTH decreased from 286.9 ± 107.2 to 154.6 ± 42.2 pg/ml (P < 0.01) after PEIT (percentual reduction 36.5 ± 9.5%). This response was significantly correlated to total ethanol volume used (r: 0.94, P < 0.0001). Hypercalcemia disappeared in six of eight patients treated. Only minor complications were registered. There were no changes in renal function related to the treatment. Our findings show that PEIT is a useful and safe alternative for patients with persistent post-transplant secondary hyperparathyroidism.Fil: Douthat, Walter Guillermo. Universidad Católica de Córdoba. Facultad de Ciencias de la Salud; ArgentinaFil: Orozco, Santiago E. Department of Radiology, Hospital Privado-Centro Médico de Córdoba, Córdoba, ArgentiFil: Maino, Pablo. Department of Radiology, Hospital Privado-Centro Médico de Córdoba, Córdoba, ArgentinaFil: Cardozo, Gabriela. Universidad Católica de Córdoba. Facultad de Ciencias de la Salud; ArgentinaFil: Arteaga, Javier de. Universidad Católica de Córdoba. Facultad de Ciencias de la Salud; ArgentinaFil: Fuente, Jorge de la. Universidad Católica de Córdoba. Facultad de Ciencias de la Salud; ArgentinaFil: Chirchiu, Carlos R. Universidad Católica de Córdoba. Facultad de Ciencias de la Salud; ArgentinaFil: Massari, Pablo U. Universidad Católica de Córdoba. Facultad de Ciencias de la Salud; Argentin

Prospective study of factors associated with asthma attack recurrence (attack) in children from three Ecuadorian cities during COVID-19: a study protocol

Introduction Asthma is a growing health problem in children in marginalised urban settings in low-income and middle-income countries. Asthma attacks are an important cause of emergency care attendance and long-term morbidity. We designed a prospective study, the Asthma Attacks study, to identify factors associated with recurrence of asthma attacks (or exacerbations) among children and adolescents attending emergency care in three Ecuadorian cities. Methods and analysis Prospective cohort study designed to identify risk factors associated with recurrence of asthma attacks in 450 children and adolescents aged 5-17 years attending emergency care in public hospitals in three Ecuadorian cities (Quito, Cuenca and Portoviejo). The primary outcome will be rate of asthma attack recurrence during up to 12 months of follow-up. Data are being collected at baseline and during follow-up by questionnaire: sociodemographic data, asthma history and management (baseline only); recurrence of asthma symptoms and attacks (monthly); economic costs of asthma to family; Asthma Control Test; Pediatric Asthma Quality of life Questionnaire; and Newcastle Asthma Knowledge Questionnaire (baseline only). In addition, the following are being measured at baseline and during follow-up: lung function and reversibility by spirometry before and after salbutamol; fractional exhaled nitric oxide (FeNO); and presence of IgG antibodies to SARS-CoV-2 in blood. Recruitment started in 2019 but because of severe disruption to emergency services caused by the COVID-19 pandemic, eligibility criteria were modified to include asthmatic children with uncontrolled symptoms and registered with collaborating hospitals. Data will be analysed using logistic regression and survival analyses. Ethics and dissemination Ethical approval was obtained from the Hospital General Docente de Calderon (CEISH-HGDC 2019-001) and Ecuadorian Ministry of Public Health (MSP-CGDES-2021-0041-O N° 096-2021). The study results will be disseminated through presentations at conferences and to key stakeholder groups including policy-makers, postgraduate theses, peer-review publications and a study website. Participants gave informed consent to participate in the study before taking part