Entreveramiento en redes bosónicas unidimensionales

Nosotros estudiamos los puntos críticos cuánticos del modelo de Bose-Hubbard en una cadena unidimensional implementando la entropía de von Neumann de bloque, de un sitio y dos sitios mediante el método de Grupo de Renormalización de la Matriz Densidad, para densidades con valor entero -sin interacción a primeros vecinos y semientero con interacción a primeros vecinos. Para todos los casos el valor de la interacción Colombiana en un sitio se mantuvo constante e igual a U = 1 y se realizó un barrido sobre el parámetro t, el cual representa la energía cinética de los bosones. Asimismo, para todos los casos se mantuvo el número de bosones constante y el modelo fue analizado con condiciones de frontera abiertas. Para sistemas con densidades de [Fórmula] se observó que la entropía de von Neumann de bloque muestra un cambio en su comportamiento a medida que el parámetro t se incrementa, indicándonos una transición de fase entre la fase Aislante de Mott y la fase Superuida. Para _ = 1 se encontró un valor crítico en tc = 0:30 con una diferencia del 2:4%, 4:3% y 1:6% con respecto a los valores reportados por Kuhner y colaboradores [9], Lauchli y colaboradores [13] y Ejima y colaboradores [25], y para el caso _ = 2 se encontró un valor crítico en tc = 0:18, igualando al valor reportado por Ejima y colaboradores [25]. En los casos anteriores la entropía von Neumann de un sitio y de dos sitios no dan información de la transición de fase. Cuando el sistema tiene una densidad de _ = 1=2 se observó que tanto la entropía de bloque como la entropía de un sitio dan información acerca de la transición de fase entre la fase Onda Densidad de Carga y la fase Superfluida, obteniéndose por medio de la primera medida, un valor crítico de tc = 0:127 el cual difiere un 1:6% del valor reportado por Kuhner y colaboradores en [9]. La entropía de dos sitios no da información de la transición de fase cuántica. Lo observado por nosotros muestra que la entropía de von Neumann de bloque puede ser una pista como medida útil y como indicador de los puntos de transición de fase, ya que está mostró los puntos críticos para los dos casos estudiados. / Abstract. We studied the quantum critical points of the Bose-Hubbard model in a one-dimensional chain, implementing the von Neumann entropy by means of the Density Matrix Renormalization Group (DMRG) ,for integer value densities -without _rst neighbor interaction-. For all the cases the Coulombian interaction value in a site U was remained constant and equal to 1. A swept was done over the t parameter, which represents the bosons kinetic energy. The number of bosons was remained constant as well and the model was analized with open boundary conditions. For systems with densities [Mathematical formula] it was observed that the block von Neumann entropy shows a change in its behavior as the t parameter increases, indicating a phase transition between Mott Insulator phase and Superuid phase. For _ = 1 it was found a critical value at t0:30 with a di_erence of 2:4%, 4:3% and 1:6% with respect to the values reported by Kuhner et. al. [9], Lauchli et. al. [13] and Ejima et. al. [25]. For the [Mathematical formula], it was found a critical value at tc = 0:18, the same value reported by Ejima et. al. [25]. For the systems with integer densities, the one-site and two-site von Neumann entropy, do not give any information about the phase transition. When the system has a density of [Mathematical formula] it was observed that the block entropy as well as the one-site entropy did give information about the phase transition about the phase transition between the Charge Density Wave phase and superuid phase, obtaining by means of the _rst measurement a critical value of tc = 0:127 which di_ers a 1:6% from the value reported by Kuhner et. al. in [9]. The two-site entropy did not give information about the quantum phase transition. What we observed is that the block von Neumann entropy could be a useful measurement and an indicator of the phase transition because it showed the critical points for the cases studied.Maestrí

Experiencias docentes en tiempo de pandemia

El texto Experiencias docentes en tiempo de pandemia está estructurado en dos partes: 1. Discusiones necesarias sobre la educación superior en tiempo de pandemia. 2. Prácticas docentes en época de pandemia expresadas a través del relato. En la primera parte, se presenta un conjunto de nueve artículos que buscan fundamentar teóricamente la situación actual de la educación conforme a las circunstancias que estamos viviendo, de manera que: Robert Fernando Bolaños Vivas, en su artículo La filosofía de la Educación ante la crisis sanitaria COVID-19, una oportunidad de humanización, considera que la crisis sanitaria de la COVID-19 ha puesto de manifesto la profunda crisis humana que pone a prueba la calidad de los seres humanos, razón por la cual el autor intenta demostrar la deficiente respuesta antropológica a las complejas exigencias y complejidades de la crisis sanitaria provocada por la COVID- 19, en este sentido, en el artículo reflexiona sobre la dimensión de la alteridad, la historicidad y la temporalidad humana

Treatment with tocilizumab or corticosteroids for COVID-19 patients with hyperinflammatory state: a multicentre cohort study (SAM-COVID-19)

Objectives: The objective of this study was to estimate the association between tocilizumab or corticosteroids and the risk of intubation or death in patients with coronavirus disease 19 (COVID-19) with a hyperinflammatory state according to clinical and laboratory parameters. Methods: A cohort study was performed in 60 Spanish hospitals including 778 patients with COVID-19 and clinical and laboratory data indicative of a hyperinflammatory state. Treatment was mainly with tocilizumab, an intermediate-high dose of corticosteroids (IHDC), a pulse dose of corticosteroids (PDC), combination therapy, or no treatment. Primary outcome was intubation or death; follow-up was 21 days. Propensity score-adjusted estimations using Cox regression (logistic regression if needed) were calculated. Propensity scores were used as confounders, matching variables and for the inverse probability of treatment weights (IPTWs). Results: In all, 88, 117, 78 and 151 patients treated with tocilizumab, IHDC, PDC, and combination therapy, respectively, were compared with 344 untreated patients. The primary endpoint occurred in 10 (11.4%), 27 (23.1%), 12 (15.4%), 40 (25.6%) and 69 (21.1%), respectively. The IPTW-based hazard ratios (odds ratio for combination therapy) for the primary endpoint were 0.32 (95%CI 0.22-0.47; p < 0.001) for tocilizumab, 0.82 (0.71-1.30; p 0.82) for IHDC, 0.61 (0.43-0.86; p 0.006) for PDC, and 1.17 (0.86-1.58; p 0.30) for combination therapy. Other applications of the propensity score provided similar results, but were not significant for PDC. Tocilizumab was also associated with lower hazard of death alone in IPTW analysis (0.07; 0.02-0.17; p < 0.001). Conclusions: Tocilizumab might be useful in COVID-19 patients with a hyperinflammatory state and should be prioritized for randomized trials in this situatio

Clustering COVID-19 ARDS patients through the first days of ICU admission. An analysis of the CIBERESUCICOVID Cohort

Background Acute respiratory distress syndrome (ARDS) can be classified into sub-phenotypes according to different inflammatory/clinical status. Prognostic enrichment was achieved by grouping patients into hypoinflammatory or hyperinflammatory sub-phenotypes, even though the time of analysis may change the classification according to treatment response or disease evolution. We aimed to evaluate when patients can be clustered in more than 1 group, and how they may change the clustering of patients using data of baseline or day 3, and the prognosis of patients according to their evolution by changing or not the cluster.Methods Multicenter, observational prospective, and retrospective study of patients admitted due to ARDS related to COVID-19 infection in Spain. Patients were grouped according to a clustering mixed-type data algorithm (k-prototypes) using continuous and categorical readily available variables at baseline and day 3.Results Of 6205 patients, 3743 (60%) were included in the study. According to silhouette analysis, patients were grouped in two clusters. At baseline, 1402 (37%) patients were included in cluster 1 and 2341(63%) in cluster 2. On day 3, 1557(42%) patients were included in cluster 1 and 2086 (57%) in cluster 2. The patients included in cluster 2 were older and more frequently hypertensive and had a higher prevalence of shock, organ dysfunction, inflammatory biomarkers, and worst respiratory indexes at both time points. The 90-day mortality was higher in cluster 2 at both clustering processes (43.8% [n = 1025] versus 27.3% [n = 383] at baseline, and 49% [n = 1023] versus 20.6% [n = 321] on day 3). Four hundred and fifty-eight (33%) patients clustered in the first group were clustered in the second group on day 3. In contrast, 638 (27%) patients clustered in the second group were clustered in the first group on day 3.Conclusions During the first days, patients can be clustered into two groups and the process of clustering patients may change as they continue to evolve. This means that despite a vast majority of patients remaining in the same cluster, a minority reaching 33% of patients analyzed may be re-categorized into different clusters based on their progress. Such changes can significantly impact their prognosis

VIII Encuentro de Docentes e Investigadores en Historia del Diseño, la Arquitectura y la Ciudad

Acta de congresoLa conmemoración de los cien años de la Reforma Universitaria de 1918 se presentó como una ocasión propicia para debatir el rol de la historia, la teoría y la crítica en la formación y en la práctica profesional de diseñadores, arquitectos y urbanistas. En ese marco el VIII Encuentro de Docentes e Investigadores en Historia del Diseño, la Arquitectura y la Ciudad constituyó un espacio de intercambio y reflexión cuya realización ha sido posible gracias a la colaboración entre Facultades de Arquitectura, Urbanismo y Diseño de la Universidad Nacional y la Facultad de Arquitectura de la Universidad Católica de Córdoba, contando además con la activa participación de mayoría de las Facultades, Centros e Institutos de Historia de la Arquitectura del país y la región. Orientado en su convocatoria tanto a docentes como a estudiantes de Arquitectura y Diseño Industrial de todos los niveles de la FAUD-UNC promovió el debate de ideas a partir de experiencias concretas en instancias tales como mesas temáticas de carácter interdisciplinario, que adoptaron la modalidad de presentación de ponencias, entre otras actividades. En el ámbito de VIII Encuentro, desarrollado en la sede Ciudad Universitaria de Córdoba, se desplegaron numerosas posiciones sobre la enseñanza, la investigación y la formación en historia, teoría y crítica del diseño, la arquitectura y la ciudad; sumándose el aporte realizado a través de sus respectivas conferencias de Ana Clarisa Agüero, Bibiana Cicutti, Fernando Aliata y Alberto Petrina. El conjunto de ponencias que se publican en este Repositorio de la UNC son el resultado de dos intensas jornadas de exposiciones, cuyos contenidos han posibilitado actualizar viejos dilemas y promover nuevos debates. El evento recibió el apoyo de las autoridades de la FAUD-UNC, en especial de la Secretaría de Investigación y de la Biblioteca de nuestra casa, como así también de la Facultad de Arquitectura de la UCC; va para todos ellos un especial agradecimiento

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Física Experimental: Oscilaciones y Ondas

Este texto pretende brindar al estudiante una visión acerca del comportamiento de varios sistemas oscilantes, junto a los cambios que se producen cuando se consideran fuerzas de fricción y fuerzas externas armónicas; también pretende acercarlos al entendimiento de las ondas mecánicas, de las ondas sonoras, a la descripción de los fenómenos de reflexión y refracción de la luz, a la formación de imágenes mediante el uso de lentes delgadas y, por último, al entendimiento de efectos de los polarizadores sobre la luz. El estudiante además encontrará algunos aspectos generales acerca de la forma en que se toman los datos experimentales, acompañado de la forma en que éstos se manejan y las principales pautas que le guiarán en la forma como se elabora un informe de laboratorio

Understanding the Burden of Respiratory Syncytial Virus in Older Adults in Latin America: An Expert Perspective on Knowledge Gaps

   Article full text  The article associated with this page has been accepted for online publication and is in the final stages of production. The link to the full text will be made available on this page in the next few days.  The above graphical plain language summary represents the opinions of the authors. For a full list of declarations, including funding and author disclosure statements, and copyright information, please see the full text online. (see “read the peer-reviewed publication” opposite). </p

International Social Survey Programme: Religion III - ISSP 2008

The International Social Survey Programme (ISSP) is a continuous programme of cross-national collaboration running annual surveys on topics important for the social sciences. The programme started in 1984 with four founding members - Australia, Germany, Great Britain, and the United States – and has now grown to almost 50 member countries from all over the world. As the surveys are designed for replication, they can be used for both, cross-national and cross-time comparisons. Each ISSP module focuses on a specific topic, which is repeated in regular time intervals. Please, consult the documentation for details on how the national ISSP surveys are fielded. The present study focuses on questions about religion and religious identity.Assessment of personal happiness; attitudes towards pre-marital sexual intercourse; attitudes towards committed adultery; attitudes towards homosexual relationships between adults; attitudes towards abortion in case of serious disability or illness of the baby or low income of the family; attitudes towards gender roles in marriage; people can be trusted vs. can´t be too careful in dealing with people; trust in institutions (parliament, business and industry, churches and religious organizations, courts and the legal system, schools and the educational system); mobility; attitudes towards the influence of religious leaders on voters and government; attitudes towards the benefits of science and religion (scale: modern science does more harm than good, too much trust in science and not enough in religious faith, religions bring more conflicts than peace, intolerance of people with very strong religious beliefs); judgement on the power of churches and religious organizations; attitudes towards equal rights for all religious groups in the country and respect for all religions; acceptance of persons from a different religion or with different religious views in case of marrying a relative or being a candidate of the preferred political party (social distance); attitudes towards the allowance for religious extremists to hold public meetings and to publish books expressing their views (freedom of expression); doubt or firm belief in God (deism, scale); belief in: a life after death, heaven, hell, religious miracles, reincarnation, Nirvana, supernatural powers of deceased ancestors; attitudes towards a higher truth and towards meaning of life (scale: God is concerned with every human being personally, little that people can do to change the course of their lives (fatalism), life is meaningful only because God exists, life does not serve any purpose, life is only meaningful if someone provides the meaning himself, connection with God without churches or religious services); religious preference (affiliation) of mother, father and spouse/partner; religion respondent was raised in; frequency of church attendance (of attendance in religious services) of father and mother; personal frequency of church attendance when young; frequency of prayers and participation in religious activities; shrine, altar or a religious object in respondent’s home; frequency of visiting a holy place (shrine, temple, church or mosque) for religious reasons except regular religious services; self-classification of personal religiousness and spirituality; truth in one or in all religions; attitudes towards the profits of practicing a religion (scale: finding inner peace and happiness, making friends, gaining comfort in times of trouble and sorrow, meeting the right kind of people). Optional items (not stated in all countries): ´born-again´ Christian; attitudes towards the Bible (or appropriate holy book); questions generally applicable for all countries: conversion of faith after crucial experience; personal sacrifice as an expression of faith such as fasting or following a special diet during holy season such as Lent or Ramadan; concept of God (semantic differential scale: mother - father, master - spouse, judge - lover, friend - king); belief in lucky charms, fortune tellers, faith healers and horoscopes; decision criteria for personal actions (laws or religious principles); attitudes towards members of different religious groups (Christians, Muslims, Hindus, Buddhists, Jews, Atheists or non-believers). Demography: sex; age; marital status; steady life partner; years of schooling; highest education level; country specific education and degree; current employment status (respondent and partner); hours worked weekly; occupation (ISCO 1988) (respondent and partner); supervising function at work; working for private or public sector or self-employed (respondent and partner); if self-employed: number of employees; trade union membership; earnings of respondent (country specific); family income (country specific); size of household; household composition; party affiliation (left-right); country specific party affiliation; participation in last election; religious denomination; religious main groups; attendance of religious services; self-placement on a top-bottom scale; region (country specific); size of community (country specific); type of community: urban-rural area; country of origin or ethnic group affiliation. Additionally coded: administrative mode of data-collection; weighting factor; case substitution.Das International Social Survey Programme (ISSP) ist ein länderübergreifendes, fortlaufendes Umfrageprogramm, das jährlich Erhebungen zu Themen durchführt, die für die Sozialwissenschaften wichtig sind. Das Programm begann 1984 mit vier Gründungsmitgliedern - Australien, Deutschland, Großbritannien und den Vereinigten Staaten - und ist inzwischen auf fast 50 Mitgliedsländer aus aller Welt angewachsen. Da die Umfragen auf Replikationen ausgelegt sind, können die Daten sowohl für länder- als auch für zeitübergreifende Vergleiche genutzt werden. Jedes ISSP-Modul konzentriert sich auf ein bestimmtes Thema, das in regelmäßigen Zeitabständen wiederholt wird. Details zur Durchführung der nationalen ISSP-Umfragen entnehmen Sie bitte der Dokumentation. Die vorliegende Studie konzentriert sich auf Fragen zu Religion und religiöser Identität.Einschätzung des persönlichen Glücksgefühls; Einstellung zu vorehelichem Geschlechtsverkehr und zu außerehelichem Geschlechtsverkehr (Ehebruch); Einstellung zu homosexuellen Beziehungen zwischen Erwachsenen; Einstellung zu Abtreibung im Falle von Behinderung oder Krankheit des Babys und im Falle geringen Einkommens der Familie; Rollenverständnis in der Ehe; Personenvertrauen vs. Vorsicht im Umgang mit Menschen; Institutionenvertrauen (Parlament, Unternehmen und Industrie, Kirche und religiöse Organisationen, Gerichte und Rechtssystem, Schulen und Bildungssystem); eigene Mobilität; Einstellung zum Einfluss von religiösen Führern auf Wähler und Regierung; Einstellung zu Wissenschaft und Religion (Skala: moderne Wissenschaft bringt mehr Schaden als Nutzen, zu viel Vertrauen in die Wissenschaft und zu wenig religiöses Vertrauen, Religionen bringen mehr Konflikte als Frieden, Intoleranz von Menschen mit starken religiösen Überzeugungen); Beurteilung der Macht von Kirchen und religiösen Organisationen im Lande; Einstellung zur Gleichberechtigung aller religiösen Gruppen im Land und Respekt für alle Religionen; Akzeptanz einer Person anderen Glaubens oder mit unterschiedlichen religiösen Ansichten als Ehepartner im Verwandtschaftskreis sowie als Kandidat der präferierten Partei (soziale Distanz); Einstellung zur öffentlichen Redefreiheit bzw. zum Publikationsrecht für religiöse Extremisten; Zweifel oder fester Glaube an Gott (Skala Deismus); Glaube an: ein Leben nach dem Tod, Himmel, Hölle, Wunder, Reinkarnation, Nirwana, übernatürliche Kräfte verstorbener Vorfahren; Einstellung zu einer höheren Wahrheit und zum Sinn des Lebens (Gott kümmert sich um jeden Menschen persönlich, nur wenig persönlicher Einfluss auf das Leben möglich (Fatalismus), Leben hat nur einen Sinn aufgrund der Existenz Gottes, Leben dient keinem Zweck, eigenes Tun verleiht dem Leben Sinn, persönliche Verbindung mit Gott ohne Kirche oder Gottesdienste); Religion der Mutter, des Vaters und des Ehepartners bzw. Partners; Religion, mit der der Befragte aufgewachsen ist; Kirchgangshäufigkeit des Vaters und der Mutter; persönliche Kirchgangshäufigkeit in der Jugend; Häufigkeit des Betens und der Teilnahme an religiösen Aktivitäten; Schrein, Altar oder religiöses Objekt (z.B. Kreuz) im Haushalt des Befragten; Häufigkeit des Besuchs eines heiligen Ortes (Schrein, Tempel, Kirche oder Moschee) aus religiösen Gründen; Selbsteinschätzung der Religiosität und Spiritualität; Wahrheit in einer oder in allen Religionen; Vorteilhaftigkeit der Ausübung einer Religion (Skala: inneren Frieden und Glück finden, Freundschaften schließen, Unterstützung in schwierigen Zeiten, Gleichgesinnte treffen). Optionale Items (nicht in allen Ländern ausgeführt): wiedergeborene Christen; Einstellung zur Bibel; Fragen, die grundsätzlich für alle Länder anwendbar sind: Bekehrung zum Glauben nach einem Schlüsselerlebnis; persönliche Opfer als Ausdruck des Glaubens wie Fasten oder Einhalten einer speziellen Diät während heiliger Zeiten wie z.B. Ramadan; Konzept von Gott (semantisches Differential: Mutter/Vater, Herr und Meister/Ehepartner, Richter/Liebender, Freund/König); Glaube an Glücksbringer, Wahrsager, Gesundbeter und Horoskope; Entscheidungskriterien für persönliches Handeln (Gesetzte oder religiöse Prinzipien); Einstellung gegenüber verschiedenen religiösen Gruppen (Christen, Muslime, Hindus, Buddhisten, Juden, Atheisten oder Nicht-Gläubige). Demographie: Geschlecht; Alter; Familienstand; Zusammenleben mit einem Partner; Jahre der Schulbildung, höchster Bildungsabschluss; länderspezifischer Bildungsgrad; derzeitiger Beschäftigungsstatus des Befragten und seines Partners; Wochenarbeitszeit; Beruf (ISCO-88) des Befragten und seines Partners; Vorgesetztenfunktion; Beschäftigung im privaten oder öffentlichen Dienst oder Selbständigkeit des Befragten und seines Partners; Selbständige wurden gefragt: Anzahl der Beschäftigten; Gewerkschaftsmitgliedschaft; Einkommensquellen des Befragten (länderspezifisch), Haushaltseinkommen (länderspezifisch); Haushaltsgröße; Haushaltszusammensetzung; Parteipräferenz (links-rechts), länderspezifische Parteipräferenz; Wahlbeteiligung bei der letzten Wahl; Konfession; Kirchgangshäufigkeit; Selbsteinstufung auf einer Oben-Unten-Skala; Region und Ortsgröße (länderspezifisch), Urbanisierungsgrad; Geburtsland und ethnische Herkunft. Zusätzlich verkodet wurde: Datenerhebungsart; Gewichtungsfaktoren; case substitution