Work distributions on quantum fields

We study the work cost of processes in quantum fields without the need of projective measurements, which are always ill-defined in quantum field theory. Inspired by interferometry schemes, we propose a work distribution that generalizes the two-point measurement scheme employed in quantum thermodynamics to the case of quantum fields and avoids the use of projective measurements. The distribution is calculated for local unitary processes performed on KMS (thermal) states of scalar fields. Crooks theorem and the Jarzynski equality are shown to be satisfied, and some features of the resulting distributions are studied as functions of temperature and the degree of spatio-temporal localization of the unitary operation. We show how the work fluctuations become much larger than the average as the process becomes more localized in both time and space.Outgoin

Proyecto de una explotación ganadera de porcino de cebo en el término municipal de Hontoria de Cerrato (Palencia)

no disponibleGrado en Ingeniería Agrícola y del Medio Rura

Validación preliminar del cuestionario del clima motivacional iniciado por los padres-2 (PIMCQ-2)

El propósito de este trabajo fue validar al contexto español el Cuestionario del Clima Motivacional Iniciado por los Padres-2 (PIMCQ-2). Para ello, se utilizó una muestra de 108 jugadores de tenis, con edades comprendidas entre los 12 y 17 años. Se analizaron sus propiedades psicométricas realizando un análisis factorial exploratorio, un análisis factorial confirmatorio y un análisis de la consistencia interna a través del alfa de Cronbach. Además, se examinó la validez convergente analizando las correlaciones entre el clima motivacional iniciado por padres y madres, y el clima motivacional del entrenador. Los resultados reflejaron la necesidad de eliminar seis ítems del instrumento original para obtener unos índices de ajuste aceptables en el análisis factorial confirmatorio, aunque se mantuvo la misma estructura factorial. Se obtuvieron valores de consistencia interna aceptables para los tres factores. Además, sehallaron evidencias externas de validez, puesto que las dimensiones del clima motivacional de padres y madres se relacionaron con las dimensiones del clima motivacional del entrenador. En conclusión, el estudio demostró de forma preliminar que la versión española del PIMCQ-2 revelaba unas adecuadas propiedades psicométricas

Nutrition-Related considerations for health and performance in female Volleyball: A narrative review

Although Volleyball is one of the most widely played sports in the World, there is little scientific information on how the ergo nutritional practice of female players should be designed. Therefore, the main aim of this narrative review is to resolute concise nutritional recommendations for volleyball women who players. Research databases such as PubMed, Scielo, Scopus, Medline or Academic Search Complete summarize and synthesize the recent evidence on the role of nutrition and its relationship with health and performance in this sporting discipline. Based on a literature review, we highlight that the individual adjustment of the energy value of the diet is one of the key factors for the physical performance of female volleyball players. An adequate intake of macronutrients allows for the achievement of correct energy values. To improve training adaptation, between 1.6 and 2.2 g·(kg·day)-1 of protein should be consumed. For optimal pre-competition muscle glycogen storage, 6-10 g·(kg·day)-1 of carbohydrates should be consumed, and 7- 10 g·(kg·day)-1 of carbohydrates should be consumed for adequate recovery. Micronutrients should be consumed in amounts corresponding to the recommended dietary allowances. Women volleyball players should take particular attention to the most adequate intake of these micronutrients, as well as vitamins such as iron, calcium, and vitamin D. Proper fluid intake, according to the player's needs, is crucial to maximize exercise performance. The diet of a female athlete is often characterized by low energy values, which increases the risk of various health consequences related to low energy availability. This diet of volleyball players must therefore be controlled carefully

Comparison of Sports Performance and Kinanthropometric Profiles of Elite Female Basketball and Volleyball Players over the Course of a Competitive Season

In order to maximize sports performance of team sportswomen, knowledge of the player’s characteristics in terms of different aspects and at different times of the season is needed. While the anthropometric and physical characteristics of men’s sports teams have been extensively studied, research on women’s basketball and volleyball is scarce. (1) Purpose: This study aims to contribute data about the anthropometric and physical characteristics of female basketball and volleyball players from elite women’s teams (age: 24.3 ± 2.7 years; playing experience: 14.825 ± 2.8 years) (n = 23) with a two-fold objective: (1) to describe and compare the anthropometric characteristics of these two disciplines; and (2) to identify possible differences in various parameters of sports performance depending on the discipline. (2) Methods: The anthropometric profile includes the measurements recommended by the International Society for the Advancement of Kinanthropometry; the performance tests described aerobic and anaerobic power exercises. (3) Results: The overall somatotype of the players was moderate mesomorphic and low endomorphic (5.107–3.046–1.883). Statistical differences were found between the improvement of the physical performance level of female basketball players (77%) and female volleyball players (10%) from the first to the last measurement, with better results in most of the performance tests (p 0.05). The percentage of fat-free mass correlated with improvements in lower body strength. (4) Conclusion: Lean body mass is an important predictor of exercise performance intensity. Excess fat mass is detrimental to the development of strength and endurance

Oral extrusion of a vertebral body replacement device after chordoma tumor growth and radiation: case report and review

Screw migration following anterior cervical discectomy and fusion is a very rare complication and it is often related to device failure. Even more exceptional is the extrusion of an intervertebral graft. We report the second case of migration and extrusion through the oral cavity of a cervical vertebral body replacement device (expandable cylinder) in a patient that had undergone cervical corpectomy due to a vertebral chordoma. The antecedent of radiation therapy as well as progressive tumor re-growth may have favored the development of this complication. A literature review is adde

Dirichlet Matrix Factorization: A Reliable Classification-Based Recommender System

Traditionally, recommender systems have been approached as regression models aiming to predict the score that a user would give to a particular item. In this work, we propose a recommender system that tackles the problem as a classification task instead of as a regression. The new model, Dirichlet Matrix Factorization (DirMF), provides not only a prediction but also its reliability, hence achieving a better balance between the quality and quantity of the predictions (i.e., reducing the prediction error by limiting the model’s coverage). The experimental results conducted show that the proposed model outperforms other models due to its ability to discard unreliable predictions. Compared to our previous model, which uses the same classification approach, DirMF shows a similar efficiency, outperforming the former on some of the datasets included in the experimental setup

Anticuerpos séricos contra la enfermedad de Newcastle e Influenza Aviar en aves rapaces de Chile.

Objetivo. Detectar la presencia de anticuerpos séricos sanguíneos contra los virus de la Enfermedad de Newcastle (ENC) e Influenza aviar (IA), para comprender la contribución de las aves silvestres en la transmisión de estos virus en Chile. Materiales y métodos. Se analizaron 63 aves pertenecientes a los órdenes Falconiformes y Strigiformes desde centros de rehabilitación de aves de las zonas central y sur de Chile. Se realizaron las pruebas de inhibición de la hemoaglutinación (IHA) para detectar anticuerpos contra el virus ENC e inmunodifusión en gel agar (IDGA) y ELISA para IA. Resultados. Se detectaron 14 aves positivas (22.2%) para anticuerpos séricos contra el virus de la ENC. En cambio, no se registraron anticuerpos séricos sanguíneos para el virus de la IA. Conclusiones. La presencia de aves rapaces positivas en los centros de rescate a los anticuerpos séricos contra el virus de la ENC puede ser explicada por el consumo de carne de pollos que han sido vacunados contra ENC o consumo de aves que han adquirido directamente el virus vacunal a través de los distintos procedimientos de administración (aerosoles, bebederos) de la vacuna o por el ingreso a los centros de rescate de aves rapaces migratorias, las que podrían facilitar la diseminación de la infección desde los países de origen, hecho que debe ser investigado

Do Classes in Cooperative Classrooms Have a Positive Influence on Creativity and Teamwork Skills for Engineering Students?

Contributing to the acquisition of professional creativity and teamwork skills has been a special challenge for some of the subjects taught at the Technical University of Madrid (UPM), and this has been a starting point for the work described in this paper. Some professors have intuited that the use of cooperative classrooms could facilitate the acquisition of these skills. We describe the new methodologies applied within cooperative classrooms by some professors, and present the procedure for measuring students’ perception of their own learning outcomes, skill improvements, and overall satisfaction with the use of this kind of classroom. For this project, 250 students enrolled in several subjects answered a questionnaire. The featuresof thesubjectsinvolved intheproject arewidely disparate. We present the results of the statistical analysis with special emphasis on creativity and teamwork skills, and we conclude that the use of cooperative classroom has a positive influence on the acquisition of these skills. This work has the added value of being the first analysis of student perception of the use of cooperative classroom in the acquisition of creativity and teamwork skills

Autoconcepto, actividad física y familia : análisis de un modelo de ecuaciones estructurales

El presente estudio fue realizar un análisis psicosocial del autoconcepto en adolescentes españoles, considerando de manera simultánea variables personales, familiares, académicas y físico-deportivas. Los participantes fueron 2.134 adolescentes de ambos sexos, procedentes de veinte centros educativos de Educación Secundaria Obligatoria, con edades comprendidas entre los 15 y 18 años. Se llevó a cabo un modelo de ecuaciones estructurales que explica la varianza en un 63.12% y se explora el efecto que tenía la práctica de actividad física, sobre las dimensiones del Test de Autoconcepto Forma-5 (AF-5) de García y Musitu (1999). Los resultados, señalan que el modelo se ajusta correctamente, y que de todas las dimensiones la familiar es la que mayor peso presenta, y la práctica de actividad física no es causa del resto de variables de este modelo.This study was made to carry out a psychosocial analysis of self-concept in Spanish adolescents, simultaneously considering personal, physical, sports, family and academic variables. The participants were 2,134 adolescents of both genders, from twenty Secondary Schools, aged between 15 and 18 years old. A structural equation model was made that explained the variance at 63.12% and explored the effect that physical activity had using the dimensions of the Autoconcepto Forma-5 (AF-5) Test by García and Musitu (1999). The results show that the model was correctly adjusted and that, out of all the dimensions, family has the greatest weight and that the practice of physical activity is not a cause of other variables in the model.O presente estudo visou realizar uma análise psicossocial do autoconceito em adolescentes espanhóis, considerando simultaneamente variáveis pessoais, familiares académicas e físico-desportivas. Os participantes foram 2.134 adolescentes de ambos os sexos, precedentes de vinte centros educativas de Educação Secundária Obrigatória, com idades compreendidas entre os 15e os 18 anos. Foi realizado um modelo de equações estruturas que explica 63.12% da variância, explorando-se de igual modo o efeito que teria a prática de actividade física, sobre as dimensões do Teste de Autoconceito Forma- 5 (AF-5) de García e Musitu (1999). Os resultados, demonstram que o modelo se ajusta correctamente, e que de todas as dimensões, a familiar é a que maior peso apresenta, e a prática de actividade física não é causa das restantes variáveis deste modelo