Orientation and digital innovation construction of Medical Physics curriculum / 中华医学教育探索杂志

Medical Physics is an interdiscipline which is formed by applying the basic principles, methods, and techniques of physics to clinical medical research such as prevention, diagnosis, and treatment of human diseases, and it is a compulsory professional basic course for medical students. However, there are many medical students reflect that the content of this course is obscure and difficult to understand. Teaching effect is not ideal. The main reasons are that the teaching method is single and the reference materials are few. Based on the actual situation of the course, Hebei Medical University, China promotes formative evaluation from the content of teaching materials, teaching means, and other aspects. At the same time, by combining with the Internet, the digital construction has been realized, deepening the reform of the Medical Physics curriculum, and remarkable results have been achieved.

Research and implementation of ideological and political elements into the medical physics curriculum / 中华医学教育探索杂志

In order to improve the students' initiative and values in knowledge seeking, this study integrates ideological and political elements into the medical physics curriculum. On the basis of the standard curriculum, 11 ideological and political elements corresponding to 6 knowledge points are added to the courseware and teaching plan and implemented in the classroom. The changes of students' ideological and moral level and values before and after teaching were statistically analyzed by questionnaire. The results show that through the integration of ideological and political elements, 98.15% (106/108) think it is necessary to integrate the ideological and political elements into the curriculum. The proportion of students who study for the purpose of working skills, national medical care and world medical care has increased, while the proportion of students who earn credits has decreased, which shows that students' learning initiative and values have been improved.

Analysis of the current team building of medical physics talent system in Hong Kong of China and its implications / 中华医院管理杂志

Medical physicists play an important role in the delivery of radiotherapy. Compared with China′s mainland, Hong Kong has established a more mature training mode and a more complete management system for medical physics talents. In this article, the authors introduced the current state of medical physics talent training, as well as the recruitment, certification and promotion of medical physicist in Hong Kong by querying the official websites of medical physics organizations, reviewing related literature and interviewing senior medical physicists in Hong Kong. The authors also analyzed the shortcomings in the construction of medical physics talent system in China′s mainland and made valuable suggestions.

A questão do sentido no mundo do acaso / The question of meaning in a world of chance / La cuestión del sentido en el mundo del azar

O artigo enfoca a confluência dos princípios fundamentais que norteiam a física quântica e a psicologia analítica. Destaca a questão de estarmos habituados a lidar com as aplicações práticas decorrentes de ambas as abordagens e a dificuldade de integrarmos suas implicações no que concerne a nossa visão de mundo. Compreende a experiência da sincronicidade como sendo a experiência humana da interconexão quântica e elabora a questão do sentido envolvida nessa vivência, a percepção de fazermos parte integrante de uma ordem mais ampla, a vivência paradoxal da unicidade e do cósmico.

The article focuses on the confluence of the fundamental principles that guide quantum physics and analytical psychology. Of note is the question of dealing with the practical issues arising from both approaches and the difficulty of integrating their implications in terms of our worldview. The experience of synchronicity is understood as being the human experience of quantum interconnection, and the article expounds on the question of meaning involved in this experience, the perception of being an integral part of a broader order, and the paradoxical experience of uniqueness and the cosmic.

El artículo se centra en la confluencia de los principios fundamentales que orientan la física cuántica y la psicología analítica. Destaca la cuestión de que estamos habituados a tratar con las aplicaciones prácticas derivadas de ambos abordajes y la dificultad que tenemos de integrar sus implicancias en lo que concierne a nuestra visión del mundo. Comprende la experiencia de la sincronicidad como la experiencia humana de interconexión cuántica y elabora la cuestión del sentido intrínseca en esa vivencia, la percepción de formar parte integrante de un orden más amplio, la vivencia paradojal de la unicidad y de lo cósmico.

Reflexiones sobre el primer programa de magister en física médica en diagnóstico por imagen de Chile / Reflections on the first master's degree on physics in diagnostic imaging from Chile

El objetivo del presente artículo de actualización será dar a conocer el nuevo programa de postgrado desarrollado denominado Magíster en Física Médica en diagnóstico por imagen, describiendo sus principales características y proponiendo algunas reflexiones. Este programa tiene la particularidad de permitir el acceso a diferentes Licenciados provenientes de las áreas de la Salud, Ingenierías o Ciencias. El plan de trabajo para este programa es de dos años, contempla cuatro semestres, con 91 créditos transferibles (SCT) por concepto de cursos y 27 SCT dedicados a la tesis. Dando un total de 118 SCT. Los Físicos Médicos son profesionales con formación académica de postgrado y entrenamiento clínico, que forman parte del grupo multidisciplinario profesional responsable del diagnóstico y tratamiento de pacientes, garantizando la calidad de los aspectos técnicos que intervienen en los procesos, la efectividad y la seguridad de los mismos, reduciendo así la probabilidad de accidentes. El programa de Magíster en Física Médica en diagnóstico por imagen de la Universidad de Tarapacá abre sus puertas para profesionales que se interesen a recibir esta formación única en Chile y ayudar en la tarea de hacer cada día del diagnóstico por imagen, una actividad más segura para los pacientes, profesionales y el público en general.

The main objective of this updating article is to present the latest Post-graduated developed program named " Master in Medical Physics in image diagnosting", describing its main characteristics and proposing some reflections about it. This program is focused on different graduates from the Health, Engineering or Science field. The study plan for this program is two years, including four semesters with 91 transferable credits for courses and 27 SCT dedicated to the thesis with a total of 118 SCT. Medical Physicists are professionals with postgraduate academic and clinical training, which is part of the professional multidisciplinary group that is responsible for the diagnosis and treatment of patients, guaranteeing the quality of the technical areas involved in the processes, the effectiveness and safety, and reducing the probability of accidents. This program of "Universidad de Tarapaca" is open to professionals that are interested in receiving unique training in Chile and in helping to provide accurate and safe imaging diagnosis to patients on a daily basis.

Application of project-based learning in clinical teaching of radiation physics for radiotherapy residents / 中华放射肿瘤学杂志

Objective:To observe the effect of project-based learning (PBL) in the clinical teaching of radiation physics.Methods:Thirty-two residents specializing in radiotherapy were included in the study. In the experimental group ( n=16), PBL was adopted, while traditional clinical teaching method was employed in the control group ( n=16). After the rotation, the assessment was conducted, as well as a questionnaire survey was performed, including five aspects: overall satisfaction, understanding of radiation physics knowledge, learning motivation, learning burden, and learning efficiency. Results:The assessment score in the experimental group was 86.31±5.41, which was higher than 75.28±5.91 in the control group, and the difference was statistically significant. Residents in the experimental group were satisfied with the effect of PBL.Conclusion:Compared with the traditional teaching method, PBL can improve the learning motivation, efficiency, and performance of radiotherapy residents, which is highly recognized by the residents.

Fundamentos físicos del gesto técnico del pitcher / Fundamentos físicos do gesto técnico do lançador / Physical foundations of the pitcher's technical gesture

RESUMEN La codicia por lanzar duro en el béisbol, más el desconocimiento mecánico-energético del aporte y lo que evita la correcta ejecución de las fases del gesto técnico del pitcher, resultaron ser las principales causas de las lesiones y el motivo de una investigación explicativa, a través de la aplicación de métodos físicos cinemáticos, dinámicos y energéticos, en el estudio de la manifestación de leyes físicas durante la observación no participativa de su desempeño, al lanzar la pelota, tanto en lanzadores nacionales como internacionales y de testimonios de personas con experiencias como pitcher. El objetivo de este artículo consistió en proponer una explicación física de cómo funciona la biomecánica del cuerpo del pitcher durante los gestos técnicos del lanzamiento para garantizar una bola rápida y minimizar lesiones. Con este trabajo, se pretendió, además, instruir al pitcher de cómo funciona la biomecánica de su cuerpo durante el lanzamiento de la pelota, aprovechando ventaja de la altura del montículo con argumentos desde la ciencia Física; esto contribuyó a lanzamientos más rápidos, elegantes y a minimizar lesiones. Como resultado, se elaboró una explicación física por fases para el pitcher, además, un sistema masa-resorte aislado para experimentar movimientos biomecánicos y energéticos, que evidenciaron en su desempeño manifestaciones de las leyes físicas de la mecánica clásica de Newton, de la conservación de la energía mecánica, del momento cinético y del momento angular.

RESUMO A ganância de jogar duro no basebol, mais a ignorância mecânico-energética da contribuição e o que impede a correta execução das fases do gesto técnico do lançador, revelaram-se as principais causas de lesões e a razão de uma pesquisa explicativa, através da aplicação de métodos físicos cinemáticos, dinâmicos e energéticos, no estudo da manifestação das leis físicas durante a observação não participativa do seu desempenho, ao lançar a bola, tanto em lançadores nacionais como internacionais e testemunhos de pessoas com experiências como lançadores. O objetivo deste artigo é propor uma explicação física de como funciona a biomecânica do corpo do lançador durante os gestos técnicos de lançamento para garantir uma bola rápida e minimizar as lesões. Com este trabalho, pretende-se também instruir o lançador sobre como funciona a biomecânica do seu corpo durante o lançamento da bola, tirando partido da altura do monte com argumentos da ciência física. Isto contribui para campos mais rápidos e mais elegantes e para minimizar as lesões. Como resultado, foi elaborada uma explicação física por fases para o jarro, além disso, um sistema isolado de suspensão em massa para experimentar movimentos biomecânicos e energéticos, que evidenciou no seu desempenho, manifestações das leis físicas da mecânica clássica de Newton, da conservação da energia mecânica, do momento cinético e do momento angular.

ABSTRACT The greed to throw hard in baseball, plus the mechanical-energetic ignorance of the contribution and what prevents the correct execution of the phases of the pitcher's technical gesture, turned out to be the main causes of injuries and the reason for an explanatory research, through the application of physical kinematic, dynamic and energetic methods, in the study of the manifestation of physical laws during the non-participatory observation of their performance, when throwing the ball, both in national and international pitchers and testimonies of people with experiences as pitchers. The objective of this article is to propose a physical explanation of how the biomechanics of the pitcher's body works during the technical gestures of pitching to guarantee a fast ball and minimize injuries. With this work, it is also intended to instruct the pitcher on how the biomechanics of his body works during the pitching of the ball, taking advantage of the height of the mound with arguments from the physical science. This contributes to faster, more elegant pitches and to minimize injuries. As a result, a physical explanation by phases was elaborated for the pitcher, in addition, an isolated mass-spring system to experiment biomechanical and energetic movements, which evidenced in their performance manifestations of the physical laws of Newton's classical mechanics, conservation of mechanical energy, kinetic momentum and angular momentum.

O Ensino de Física para Surdos: o Estado da Arte da Pesquisa em Educação / The Teaching of Physics for the Deaf: the State of the Art of Research in Education

RESUMO: A Educação Especial, no Brasil e em outros lugares do mundo, ao longo de décadas, tem passado por muitas transformações, e novos paradigmas estão sendo criados, outros abandonados, porém muitas questões ainda continuam em aberto. Uma delas refere-se ao ensino na área das Ciências da Natureza para surdos. Com o objetivo de compreender como está ocorrendo o ensino em um dos importantes campos das Ciências Naturais, a Física, este artigo compôs o estado da arte de pesquisas sobre a educação de surdos, nessa área do conhecimento. Para tanto, esta pesquisa bibliográfica utilizou como suporte metodológico a análise de conteúdo de Bardin, com o intuito de identificar tendências em pesquisas que envolvam essa temática, e, como base de dados, foi usado o banco de teses e dissertações da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), e os diretórios Education Resources Information Center (ERIC), Scientific Electronic Library Online (SciELO), SciVerse Scopus e Google Acadêmico. Entretanto, foi encontrado um número pequeno de pesquisas em relação ao volume de produções acadêmicas consultadas, ressaltando que existe um grande déficit a ser sanado. Além disso, a maioria das pesquisas encontradas, apesar de apresentarem estratégias de ensino relevantes, não utilizam satisfatoriamente os diferentes níveis de representação de fenômenos físicos, algo que pode eventualmente causar obstáculos de natureza epistemológica e visões inadequadas para os modelos desses fenômenos.

ABSTRACT: Special Education, in Brazil and other places in the world, for decades, has gone through many transformations, and new paradigms are being created, others abandoned, but many questions still remain open. One of them refers to teaching in the area of Natural Sciences for the deaf. In order to understand how teaching is taking place in one of the important fields of Natural Sciences, Physics, this paper composed the state of the art of research on Education for the deaf in this area of knowledge. To this end, this bibliographic research used Bardin's content analysis as methodological support, in order to identify trends in research involving this theme, and as a database, the thesis and dissertation database of the Coordination for the Improvement of Higher Education Personnel (CAPES), and the Education Resources Information Center (ERIC), Scientific Electronic Library Online (SciELO), SciVerse Scopus and Google Scholar directories were used. However, a small number of researches were found in relation to the volume of consulted academic productions, pointing out that there is a large deficit to be solved. In addition, most of the research found, despite presenting relevant teaching strategies, does not satisfactorily use the different levels of representation of physical phenomena, something that can eventually cause obstacles of an epistemological nature and inadequate views for the models of these phenomena.

Enseñar física a través del teatro / Physics teaching through theater

RESUMEN El problema de investigación en este trabajo es articular el arte del teatro, su pasión y su estética, a la formación científica, para pensar, sentir y disfrutar el mundo. El objetivo de este trabajo fue determinar cómo valoran los estudiantes de educación media y docentes en formación, el uso de la obra "Galileo Galilei", para la enseñanza de la Física clásica. Esta investigación es interpretativa, con un diseño cualitativo de casos múltiples. Para la recolección y análisis de información, se usaron las técnicas de grupo focal y de análisis del discurso. Los resultados mostraron un aprendizaje más dinámico y divertido, cambio en las concepciones sobre la naturaleza de las ciencias y mejora en las relaciones sociales.

ABSTRACT The research problem in this work is to articulate the art of the theater with his passion and aesthetic, to a scientific formation, for thinking, feeling and enjoying the world. The objective of this research was to determine how the students of middle education and preservice teacher, value the use of the "Galileo Galilei" play, to teach classical physics. This research is interpretive, and qualitative design, with multiple cases. For the collection and analysis of information, the focus group and discourse analysis techniques were used. The results showed a more dynamic and fun learning, change in the conceptions about the nature of the sciences, and improve in social relations.

Fractal features of soil texture and physical attributes in indian dark earth under different uses in Western Amazon / Características fractais da textura e atributos físicos do solo em áreas com terra preta de índio sob diferentes usos na Amazônia Ocidental

Studying particle size distribution is important to understand soil structure and formation processes. This research aimed to assess the fractal dimension of soil texture in Indian Dark Earth (IDE) areas in southern Amazonas state under different land uses, as follows: two areas in the municipality of Apuí, one growing cocoa and the other coffee; a grassland area in the municipality of Manicoré; and a forest area in the municipality of Novo Aripuanã. A sampling grid containing 88 collection points (intersecting points on the grid) was established in each area, measuring 80 x 42 m for the cocoa and coffee-growing sites, and 80 x 56 m and 60 x 42 m for the grassland and forest areas, respectively. Soil samples were collected in soil core and as clumps at a depth of 0.0-0.20m to determine the structural physical properties and texture of the soil. The following physical attributes were assessed: texture (PSD), bulk density (BD), macroporosity (Macro), microporosity (Micro), total porosity (TP) and aggregate stability (GMD and WMD). The fractal dimension (D) of the soil texture was determined, followed by analysis of variance and comparison of the means using Tukey's test (p≤0.05). Pearson's correlation was applied to assess the correlation between variables. There was a significant difference between the IDEs studied, with a higher D value in the cocoa-growing area in relation to the other sites. Additionally, the larger the clay fraction, the higher the D value. Fractal dimension (D) showed a positive correlation with sand, clay, BD, Macro, GMD and WMD, and a negative correlation with silt, micro, TP. Based on the D values obtained, the ADE cultivated with cocoa showed superior quality in relation to the other areas studied.KEYWORDS: Fractal dimension. Soil physics. Soil use. INTRODUCTION Applications of fractal geometry in soil science have shown that soil exhibits fractal characteristics, being a porous medium having different particle compositions, with irregular shape and self-similar structure (TYLER; WHEATCRAFT, 1989; KRAVCHENKO; ZHANG, 1998). Fractal geometry, proposed and established by Mandelbrot (1982), is a method for describing systems with non-characteristic scales and self-similarity. In recent years, this theory has been used to quantitatively describe the particle size distribution of soil, attracting the interest of pedologists worldwide (DENG et al., 2017). Particle size distribution is one of the most important physical characteristics of soil because of its significant influence on water flow and soil erosion (XU; LI; LI, 2013). In this respect, broad and precise knowledge of particle size distribution is vital to understanding soil structures and formation, since it is closely related to soil erosion, organic matter content and moisture content (DU et al., 2017). Deng et al. (2017) studied the fractal features of soil particle size distribution and found an association between fractal dimensions and the physical and chemical properties of the soil analyzed, indicating that the lower the fractal dimension, the worse the soil physical and chemical properties. Recently, the fractal method was applied to estimate soil structure and proved to be an efficient tool in analyzing soil Received: 01/04/2019 Accepted: 30/01/2020

Estudar a distribuição do tamanho das partículas é importante para entender a estrutura do solo e os processos de formação. Esta pesquisa teve como objetivo avaliar a dimensão fractal da textura do solo em áreas de Terra Preta de Índio (TPI) no sul do Estado do Amazonas sob diferentes usos da terra: duas áreas no município de Apuí, uma com cultivo de cacau e outra de café; uma área de pastagem no município de Manicoré; e uma área florestal no município de Novo Aripuanã. Uma malha de amostragem contendo 88 pontos de coleta (pontos de interseção na grade) foi estabelecida em cada área, medindo 80 x 42 m para as áreas de cacau e café, e 80 x 56 m e 60 x 42 m para as áreas de pastagem e floresta, respectivamente. Amostras de solo foram coletadas em torrões a uma profundidade de 0,0-0,20 m para determinar as propriedades físicas estruturais e a textura do solo. Os seguintes atributos físicos foram avaliados: textura, densidade do solo (DS), macroporosidade (Macro), microporosidade (Micro), porosidade total (PT) e estabilidade de agregados (DMG e DMP). Determinou-se a dimensão fractal da textura do solo (D), seguida da análise de variância e comparação das médias pelo teste de Tukey (p≤0,05). A correlação de Pearson foi aplicada para avaliar a correlação entre as variáveis. Houve uma diferença significativa entre as TPIs estudadas, com um maior valor D na área de cultivo de cacau em relação aos outros locais. Além disso, quanto maior a fração argila, maior o valor de D. A dimensão fractal (D) apresentou correlação positiva com areia, argila, DS, Macro, DMG e DMP, e correlação negativa com silte, micro, PT. Com base nos valores de D obtidos, as TPIs cultivadas com cacau apresentaram qualidade superior em relação às demais áreas estudadas.PALAVRAS-CHAVES: Dimensão Fractal. Física do solo. Uso do solo. REFERENCES ALVARENGA, R. C.; FERNANDES, B.; SILVA, T. C. A.; RESENDE, M. Estabilidade de agregados de um Latossolo Roxo sob diferentes métodos de preparo do solo e de manejo da palha do milho. Revista Brasileira de Ciência do Solo, Viçosa, v. 10, n. 2, p. 273-277, 1986.

Comparative evaluation of efficacy of physics forceps versus conventional forceps in therapeutic extractions of premolars: a prospective clinical study

Background: Dental extraction is the removal of a tooth from the oral cavity and is the most common procedure performed in oral surgery. Conventional exodontia tends to cause unnecessary trauma leading to postoperative pain, loss of tissue and stress for the patient. ‘Atraumatic’ dental extraction techniques have nowadays gained popularity and in such case, physics forceps can be helpful in achieving such results. The aim of the study was to evaluate and compare efficacy of physics forceps versus conventional forceps in therapeutic extraction of premolars.Methods: A total of 35 patients requiring extraction of premolars in maxillary or mandibular arch or both arches for orthodontic treatment purpose were included and divided into groups A and B wherein right sided extractions performed with physics forceps were compared with left sided extractions carried out using conventional forceps in terms of time taken for extraction, bone and soft tissue injury, success score and pain assessment.Results: The present study suggested statistically significant difference between both the groups. Time taken for extraction, trauma to gingival tissue, bone loss, and visual analogue scale (VAS) score was significantly lesser with physics forceps group, when compared to conventional forceps group. Moreover no significant difference in success score was noted between both the groups.Conclusions: Physics forceps are comparatively superior to conventional extraction forceps in terms of lesser time taken for the procedure, lesser tendency to induce trauma to both hard and soft tissue and have been found to induce comparatively lesser pain post extraction.

Meanings of physics mathematization in pre-service physics teachers / Significados de matematización de la física en docentes de física en formación / Significados da matemátização da física em professores de física en formação

Abstract Introduction. Physics teaching practice is permeated by the meaning that teachers constructed about the relationship between mathematics and physics, but this relationship often goes unnoticed by the teacher himself, because of their education where it is traditionally thoughtlessly assumed that "mathematics is the physics language." Objective. In this work, we contribute to the comprehension of how modifying this reality in teacher training. To this end, we conducted a study on how is understanding physics and mathematics relationships by pre-service teachers. Materials and methods. Data collection was done from observation of a non-participating classroom in two physics courses using an observation grid and a questionnaire. We made a content analysis. Results. We found that pre-service teachers consider the mastery of problem-solving equations as the primary medium for learning physics, but when they are asked to explain physics they usually opt for qualitative descriptions and pictorial representations not for equations. Conclusions. It means that they differentiate between a "mathematical part" of the phenomenon that is self-controlled as the basis of his physics learning and a "qualitative part" of the phenomenon that serves to explain physics. So, it seems that to teach physics they feel the need to explain conceptually without mathematics, while to learn physics they should concentrate on applying equations, which is paradoxical.

Resumen Introducción. El tipo de trabajo docente en la enseñanza de la física está influenciado por el significado que cada docente ha construido sobre la relación entre las matemáticas y la física, pero esta relación a menudo pasa desapercibida para el maestro mismo, ya que es tradición en su formación suponer irreflexivamente que "las matemáticas son el lenguaje de la física". Objetivo. En este trabajo, contribuimos a la comprensión de cómo modificar esta realidad en la formación del profesorado. Con este fin, llevamos a cabo un estudio sobre cómo es la comprensión de las relaciones de física y matemáticas por parte de los docentes en formación. Materiales y métodos. La recolección de datos se realizó a partir de la observación no participante en dos cursos de física utilizando una rejilla de observación y un cuestionario. El análisis se hizo a partir del análisis de contenido. Resultados. Descubrimos que los maestros en formación consideran el dominio de las ecuaciones en la resolución de problemas como el eje fundamental para aprender física, pero cuando se les pide que expliquen física, optan por descripciones cualitativas y representaciones pictóricas y no por ecuaciones. Conclusiones. Los docentes en formación diferencian entre la "parte matemática" del fenómeno al que atribuye la base de su aprendizaje de física y la "parte cualitativa" del fenómeno que sirve para explicar la física. Entonces, parece que para enseñar física sienten la necesidad de explicar conceptualmente sin matemáticas, mientras que para aprender física se concentran solamente en aplicar ecuaciones, lo cual resulta paradójico.

Resumo Introdução: O tipo de trabalho docente no ensino de física é influenciado pelo significado que cada professor construiu sobre a relação entre matemática e física, mas essa relação geralmente passa despercebida pelo próprio professor, uma vez que é uma tradição em sua formaçao supõe, sem pensar, que "a matemática é a linguagem da física". Objetivo. Neste trabalho, contribuímos para a compreensão de como modificar essa realidade na formação de professores. Para tanto, realizamos um estudo sobre como é a comprensao das relaçoes entre a física e a matemática na formação de professores de física. Materiais e métodos. A coleta de dados foi realizada a partir da observação mais não do participante em diferentes aulas de física, utilizando um roteiro de observação e um questionário. A análise foi feita a partir da análise de conteúdo. Resultados. Descobrimos que os professores em formação consideram o domínio das equações na solução de problemas como o eixo fundamental para aprender física, mas, quando solicitados a explicar física, optam por descrições qualitativas e representações pictóricas, e não por equações. Conclusões. Os professores em formação diferenciam entre a "parte matemática" do fenômeno à qual ele atribui a base de seu aprendizado da física e a "parte qualitativa" do fenômeno que serve para explicar a física. Parece que, para ensinar física, eles sentem a necessidade de explicar conceitualmente sem matemática, enquanto que para aprender física, eles se concentram apenas na aplicação de equações, o que é paradoxal.

La formación de profesionales nucleares y su contribución al desarrollo de La Habana / The training of nuclear professionals and their contribution to the development of Havana

RESUMEN El presente trabajo muestra el desarrollo que ha tenido la formación de profesionales nucleares en Cuba durante más de treinta y ocho años. Se exponen las características principales de los programas de estudio de las carreras nucleares acreditadas por el sistema nacional de acreditación de la educación superior cubana. Algunos indicadores de la calidad de la formación en ingeniería nuclear, física nuclear y radioquímica, la presencia de la mujer, así como, la contribución de estas carreras al desarrollo de la provincia La Habana a partir de un análisis de la ubicación de sus egresados son presentados.

ABSTRACT This work shows the development that has taken the education of nuclear professionals in Cuba for more than thirty-eight years. The main features of the curriculum for undergraduate specialty for nuclear matters, accredited by the national accreditation system of higher education in Cuba are introduced. Some quality indicators, the women presence and the contribution of the nuclear careers to the development of Havana province beginning from the analysis of graduated distribution in the labor market are discussed.

Overcoming randomness does not rule out the importance of inherent randomness for functionality

Randomness is intrinsic to many natural processes. It is also clear that, under certain conditions, disorders are not associatedwith functionality. Several examples in which overcoming, suppressing, or combining both randomness and non-randomness is required are drawn from various fields. However, the need to suppress or overcome randomness does not negateits importance under certain conditions and its significance in valid processes and organ functions. Randomness should beacknowledged rather than ignored or suppressed; it can be viewed, at worst, as a disturbing disorder that may be treated toproduce order, or, at best, as a ‘beneficial disorder’ that can be considered as a higher level of functionality.

Interpretation of ICRU report No.89-radiation physics / 中华放射肿瘤学杂志

In this article,the content of radiation physics in the ICRU report No.89 were interpreted in details,aiming to provide reference in the radiation physics for radiologists performing brachytherapy for cervical cancer patients.

Practicality and importance of selected endothelial dysfunction measurement techniques: review

The measurement of endothelial dysfunction (ED) has importance in that it indicates the presence of coronary artery disease (Kuvin et al. in J Am Coll Cardiol 38(7):1843–1849, 2001) in addition to acting as a predictor of future adverse events (Halcox et al. in Circulation 106:653–658, 2002). Various tools, methods, and metrics exist that can provide an indicator of endothelial dysfunction. Given the signifi cance of ED, it is of utmost importance to fi nd a measurement technique that is reliable, while defi ning a metric providing a framework for an overall system that is practical, accurate, and repeatable. Success would provide a tool for the early detection of cardiovascular disease not only moving patients that are currently classifi ed as asymptomatic to symptomatic, but also providing a method to monitor the effi cacy of treatments.

Muestreo para el levantamiento de datos acerca de la enseñanza de física experimental en Guayaquil / Sampling for data collection about the teaching of experimental physics in Guayaquil / Amostragem para a pesquisa de dados sobre o ensino da física experimental em Guayaquil

Resumen Introducción: Este trabajo es parte del desarrollo de un proyecto que tiene como objetivo caracterizar el estado de la enseñanza de la Física Experimental en las instituciones educativas de nivel medio de la ciudad de Guayaquil. Objetivo: Determinar una muestra para el levantamiento de datos por medio de una encuesta acerca de la Física Experimental en Guayaquil. Materiales y métodos: Se delimitó la población de estudio y se realizó un muestreo aleatorio combinado con un muestreo estratificado. Resultados: Se debe observar 192 instituciones educativas de nivel bachillerato como muestra representativa de las 384 que conforman la población. Con esta información se calculó la proporción de instituciones por cada distrito. Conclusión: Esta no es la única vía para calcular el tamaño de la muestra, sin embargo, es necesario informar los procedimientos utilizados en este proceso, lo que permite al lector emitir su propio juicio sobre si aceptan las suposiciones del grupo de investigación y procedimientos.

Abstract Introduction: This work is part of the development of a project that aims to characterize the state of the teaching of Experimental Physics in educational institutions of the middle level of the city of Guayaquil. Objective: Determine a sample for data collection by means of a survey about Experimental Physics in Guayaquil. Materials and methods: The study population was delimited and a random sampling combined with a stratified sampling was carried out. Results: It should be noted 192 educational institutions of high school level as a representative sample of the 384 that make up the population. With this information, the proportion of institutions for each district was calculated. Conclusion: This is not the only way to calculate the size of the sample, however, it is necessary to inform the procedures used in this process, which allows the reader to make their own judgment about whether they accept the assumptions of the research group and procedures.

Resumo Introdução: Este trabalho é parte do desenvolvimento de um projeto que visa caracterizar o estado do ensino da Física Experimental em instituições de ensino do nível médio da cidade de Guayaquil. Objetivo: Determinar uma amostra para coleta de dados por meio de uma pesquisa sobre a Física Experimental em Guayaquil. Materiais e métodos: A população do estudo foi delimitada e uma amostragem aleatória combinada com uma amostragem estratificada foi realizada. Resultados: Deve-se notar 192 instituições educacionais do ensino médio como uma amostra representativa dos 384 que compõem a população. Com essa informação, a proporção de instituições para cada distrito foi calculada. Conclusão: Esta não é a única maneira de calcular o tamanho da amostra, no entanto, relatam os procedimentos utilizados neste processo, permitindo que o leitor a emitir seu próprio julgamento sobre se a aceitar o grupo de pesquisa pressupostos e procedimentos.

Percepciones de estudiantes universitarios sobre su formación en física en educación secundaria / Perceptions of university students about their education in physics in secondary education

RESUMEN Este artículo presenta los resultados de un cuestionario diagnóstico sobre las percepciones hacia la física, por parte de 104 estudiantes, quienes inician su carrera profesional de Licenciatura en Ciencias Naturales y Educación Ambiental, en una universidad colombiana. Este estudio, se centró en las siguientes categorías: experiencias sobre el aprendizaje de la física, metodología del profesor en la clase de física, dificultades de los estudiantes para aprender física y sugerencias para mejorar su enseñanza. Los resultados reflejan la importancia de explorar y generar estrategias, que permitan optimizar las cuatro dimensiones; por ejemplo, en relación al aprendizaje de la física, los participantes muestran la predominancia del enfoque abstracto. Asimismo, indican la necesidad de incluir en la enseñanza de la física las prácticas experimentales y su contextualización. Se encontraron comentarios positivos hacia el estudio de la física, cuando los estudiantes la han cursado desde los primeros grados de la educación secundaria, lo que sugiere que una enseñanza más temprana y cualitativa, puede favorecer el interés por la enseñanza de la física.

ABSTRACT This article presents the results of a diagnostic questionnaire about perceptions towards physics, by 104 students who start their professional careers as future graduates in Natural Sciences and Environmental Education in a Colombian university. This study focused on the following categories: experiences on learning of physics, methodology of teacher in the physics class, difficulties of the students to learn physics and suggestions to improve their teaching. The results reflect importance of exploring and generating strategies that optimize the four dimensions; for example, in relation to the learning of physics, the participants show the predominance of the abstract approach. Likewise, they indicate the need to include experimental practices and their contextualization in teaching of physics. Positive comments were found towards the study of physics when students have studied it from the first grades of secondary basic education, which suggests that an earlier and qualitative education may favor interest in the teaching of physics.

Analysis of radiation effects on some properties of GaAs:Cr and Si sensors exposed to a 22 MeV electron beam / Análisis de los efectos de la radiación en algunas propiedades de sensores de GaAs:Cr y Si expuestos a un haz de electrones de 22 MeV

Abstract Nowadays, the experiments related to High Energy Physics and others fields demand the use of detectors with greater radiation resistance, and the novel material GaAs:Cr has demonstrated excellent radiation hardness compared with other semiconductors. On the basis of evidence obtained in the JINR experiment with the use of 22 MeV electrons beam generated by the LINAC-800 accelerator, an analysis of electron radiation effects on GaAs:Cr and Si detectors is presented. The measured I-V characteristics showed a dark current increase with dose, and an asymmetry between the two branches of behaviors for all detectors. Analyzing the MIP spectra and CCE dose dependence measurements a deterioration process of detectors collection capacity with dose increase was found, although behaviors are somewhat different according to the detector type. The detailed explanation of these effects from the microscopic point of view appears in the text, and are generally linked to the generation of atomic displacement, vacancies and other radiation defects, modifying the energy levels structure of the target material. These changes affect the lifetime and concentration of the charge carriers, and other characteristics of the target material.

Resumen Actualmente, los experimentos relacionados con la física de altas energías y otros campos, demandan el uso de detectores con mayor resistencia a las radiaciones y el novedoso material GaAs:Cr ha demostrado poseer una excelente fortaleza comparado con otros semiconductores. En base a las evidencias obtenidas en el experimento del IUIN con el uso de un haz de electrones de 22 MeV generado por el acelerador LINAC-800, se presenta un análisis de los efectos de la radiación en detectores de Si y GaAs:Cr. Las características I-V medidas mostraron un incremento de la corriente de fuga con la dosis y una asimetría entre las dos ramas de estos comportamientos para todos los detectores. Analizando las mediciones de los espectros MIP y la dependencia de la CCE con la dosis, fue encontrado un proceso de deterioro de la capacidad de detección de los detectores con el aumento de la dosis, sin embargo, los comportamientos son diferentes de acuerdo al tipo de detector. La explicación detallada de estos efectos desde el punto de vista microscópico aparece en el texto, los cuales están relacionados generalmente con la generación de desplazamientos atómicos, vacancias y otros defectos producto de la radiación, modificando la estructura de los niveles energéticos en el material sensor. Estos cambios afectan el tiempo de vida y la concentración de los portadores de carga, así como otras características del material.

Study of charge sharing effect and energy resolution of the Timepix hybrid detector based on gallium arsenide compensated with chromium / Estudio del efecto de compartición de cargas y la resolución energética del detector híbrido Timepix de arseniuro de galio compensado con cromo

Abstract Among the latest ionizing radiation detectors, those based on chromium compensated gallium arsenide (GaAs:Cr) are ones of the most competitive for many applications due to their high Z and strong resistance to radiation damage. They have been used in high energy physics research, medical visualization and spatial technologies, geological prospecting, among other advanced fields. The object of this work is a 900 µm GaAs:Cr detector with Timepix readout technology. Some detector characteristics for three experimental conditions were measured and studied by using the X-rays from a synchrotron and an X-ray tube provided with different materials for obtaining the corresponding fluorescence photons. A complex function was used to decompose the differential spectra into the most important contributions involved. As an additional tool for the research, the mathematical modeling of the mobility of charge carriers generated by radiation within the active volume of the detector was used. The results of these charge sharing effect studies showed a noticeable prevalence in the detector of this effect, changing its contribution according to the experiment characteristics. The detector was calibrated for the planned experiments and the energy resolution was determined. From the analysis of all the obtained results and their comparison with those reported in literature, it was confirmed that the detector has a marked charge-sharing effect between neighboring pixels, being its performance more impaired as the energy of incident photons increases.

Resumen Entre los últimos detectores de radiación ionizante, los basados ​​en arseniuro de galio compensado con cromo (GaAs: Cr) son de los más competitivos para muchas aplicaciones debido a su alto Z y fuerte resistencia al daño de la radiación. Se han utilizado en investigación de física de alta energía, visualización médica y tecnologías espaciales, prospección geológica, entre otros campos avanzados. El objeto de este trabajo es un detector de GaAs: Cr de 900 µm con tecnología de lectura Timepix. Algunas características del detector para tres condiciones experimentales se midieron y estudiaron utilizando rayos X de un sincrotrón y un tubo de rayos X provisto de diferentes materiales para obtener los fotones de fluorescencia correspondientes. Se utilizó una función compleja para descomponer los espectros diferenciales en las contribuciones más importantes involucradas. Como herramienta adicional para la investigación, se utilizó el modelado matemático de la movilidad de los portadores de carga generados por la radiación dentro del volumen activo del detector. Los resultados de estos estudios de efecto de carga compartida mostraron una prevalencia notable en el detector de este efecto, cambiando su contribución según las características del experimento. El detector se calibró para los experimentos planificados y se determinó la resolución de energía. A partir del análisis de todos los resultados obtenidos y su comparación con los reportados en la literatura, se confirmó que el detector tiene un marcado efecto de reparto de carga entre píxeles vecinos, y su rendimiento se ve más afectado a medida que aumenta la energía de los fotones incidentes.