排序方式： 共有51条查询结果，搜索用时 15 毫秒
41.
RESUMENLa elaboración de un curriculum de métrica para el conocimiento de diferentes tipos de medida (longitud, peso, temperatura, volumen) es de gran utilidad en la escuela. Se comentan las características de otros tres curricula de métrica ya existentes. En el curriculum que proponen los autores se exponen los objetivos en cuatro secciones: longitud, temperatura, capacidad y peso. Dentro de cada sección los objetivos se dividen en dos apartados: medición no numérica y medición numérica. Se describen las actividades a desarrollar en términos de material, consignas y respuesta esperada del alumno. 相似文献
42.
The purpose of this paper is to analyse and describe the topological properties of the institutional and national collaboration network from the profiles extracted from Google Scholar Citations (GSC). 19,912 unique profiles with “co-authors” were obtained from a web crawl performed in March 2012. Several statistical and network analysis techniques were used to map and analyse these collaboration relationships at the country and institution level. Results show that The United States dominates the world scientific map and that every research institution is grouped by national, geographical and cultural criteria. A clustering phenomenon based on the self-similarity and fractal properties of scale-free networks is also observed. We conclude that GSC is a suitable tool for collaboration studies only at macro level between countries and institutions. 相似文献
43.
Julie A. Luft Jonah B. Firestone Sissy S. Wong Ira Ortega Krista Adams EunJin Bang 《科学教学研究杂志》2011,48(10):1199-1224
Those who study secondary science teachers are often concerned with preservice or in‐service teacher development. Science teacher educators have acknowledged that this focus is limited, as the induction years of beginning teachers are an important component of teacher development. This mixed methods study focuses on the induction years of beginning content specialists, with the intention of adding to the literature in this underexamined area. The secondary science teachers in this study were followed during their first and second year of teaching in order to understand the changes in their beliefs, pedagogical content knowledge (PCK) and practices as a group, and as they participated in different induction programs. Analysis by induction program revealed that first year teachers who participated in science specific induction programs strengthened their beliefs, PCK, and practices. By the end of the second year, regardless of program, most of the teachers shared similar beliefs and PCK. However, the teachers in the science specific induction programs continued to enact more interactive learning environments that had more investigations and laboratories than did their peers in the other induction programs. For those who work with beginning science teachers, this study suggests that the induction of science specialists is an important area of work. It also explores the complex process of induction, and calls for more research into how beginning secondary science teachers learn and what types of induction experiences can best support beginning science teachers. © 2011 Wiley Periodicals, Inc. J Res Sci Teach 48: 1199–1224, 2011 相似文献
44.
Manuel Herrador-Colmenero Jonatan R. Ruiz Francisco B. Ortega Víctor Segura-Jiménez Inmaculada C. Álvarez-Gallardo Daniel Camiletti-Moirón 《Journal of sports sciences》2015,33(8):850-862
Physical activity attenuates the symptoms of fibromyalgia, and its level is oftentimes associated with the perceived environment of fibromyalgia patients. Within this context, we aimed to study the reliability of the Spanish version of the Assessing Levels of Physical Activity (ALPHA) environmental questionnaire and the mode of commuting questionnaire. We also studied the association between the perceived environment and mode of commuting with physical activity levels among female fibromyalgia patients in Spain. Test–retest reliability was judged by the intra-class correlation coefficient (ICC), weighted kappa statistic, Spearman correlations and the proportion of agreement. We calculated bivariate Pearson’s correlations between environmental sum scores and physical activity measured by both International Physical Activity Questionnaire (IPAQ) and accelerometry. More than 70% of the scales and items showed a good reliability regarding the ICC, the weighted kappa, the Spearman correlation and the percentage of inter-agreement (higher than 50%). The perceived environment assessed with the ALPHA showed a low correlation with both IPAQ and accelerometry. The Spanish version of the ALPHA environmental questionnaire proved to be reliable and showed a weak degree of association with physical activity in female fibromyalgia patients. 相似文献
45.
Indiscipline or violence? The problem of bullying in school 总被引：1，自引：0，他引：1
Rosario Ortega Ruiz 《Prospects》1998,28(4):587-599
46.
A visual display of the most important universities in the world is the aim of this paper. It shows the topological characteristics and describes the web relationships among universities of different countries and continents. The first 1000 higher education institutions from the Ranking Web of World Universities were selected and their link relationships were obtained from Yahoo! Search. Network graphs and geographical maps were built from the search engine data. Social network analysis techniques were used to analyse and describe the structural properties of the whole of the network and its nodes. The results show that the world-class university network is constituted from national sub-networks that merge in a central core where the principal universities of each country pull their networks toward international link relationships. The United States dominates the world network, and within Europe the British and the German sub-networks stand out. 相似文献
47.
Alejandro Bastida Castillo Carlos D. Gómez Carmona Ernesto De la cruz sánchez José Pino Ortega 《European Journal of Sport Science》2018,18(4):450-457
There is interest in the accuracy and inter-unit reliability of position-tracking systems to monitor players. Research into this technology, although relatively recent, has grown exponentially in the last years, and it is difficult to find professional team sport that does not use Global Positioning System (GPS) technology at least. The aim of this study is to know the accuracy of both GPS-based and Ultra Wide Band (UWB)-based systems on a soccer field and their inter- and intra-unit reliability. A secondary aim is to compare them for practical applications in sport science. Following institutional ethical approval and familiarization, 10 healthy and well-trained former soccer players (20?±?1.6 years, 1.76?±?0.08?cm, and 69.5?±?9.8?kg) performed three course tests: (i) linear course, (ii) circular course, and (iii) a zig–zag course, all using UWB and GPS technologies. The average speed and distance covered were compared with timing gates and the real distance as references. The UWB technology showed better accuracy (bias: 0.57–5.85%), test–retest reliability (%TEM: 1.19), and inter-unit reliability (bias: 0.18) in determining distance covered than the GPS technology (bias: 0.69–6.05%; %TEM: 1.47; bias: 0.25) overall. Also, UWB showed better results (bias: 0.09; ICC: 0.979; bias: 0.01) for mean velocity measurement than GPS (bias: 0.18; ICC: 0.951; bias: 0.03). 相似文献
48.
Jeremy Vanhelst Laurent Béghin Julia Salleron Jonathan R. Ruiz Francesco B Ortega Charlene Ottevaere 《Journal of sports sciences》2013,31(2):110-115
AbstractThe aim of this study was to assess the impact of the choice of threshold on physical activity patterns measured in adolescents under free living conditions (FLC) using a uniaxial accelerometer. The study comprised 2043 adolescents (12.5–17.5 years) participating in the HELENA Study. Participants wore a uniaxial accelerometer for 7 days. The PA patterns were assessed using thresholds determined from six different studies. For each of the thresholds used, the number of adolescents fulfilling the recommendation of 60 min of moderate to vigorous PA (MVPA) per day was also calculated. A significant difference was found between thresholds regardless of the activity level: differences of 38%, 207%, 136%, and 2780% for sedentary, light, moderate, and vigorous intensity PA, respectively (P < 0.001). Time of MVPA varied between methods from 25.3 to 55.2 min · day–1. The number of adolescents fulfilling the recommendation varied from 5.9% to 37% according to the thresholds used. The kappa coefficient for concordance in the assessment of the number of adolescents achieving the PA recommendations was generally low. The definition of the threshold for PA intensity may considerably affect the PA patterns in FLC when assessed using a uniaxial accelerometer and the number of participants fulfilling the recommendations. 相似文献
49.
50.
David C. Wiley Marina Plesons Venkataram Chandra-Mouli Margarita Ortega 《American journal of sexuality education》2020,15(1):53-81
AbstractComprehensive sexuality education (CSE), one of the key evidence-based strategies in our programmatic toolbox to address adolescent pregnancy and birth rates, remains a politically-charged issue countrywide. Though there is some funding available at the federal level, there are no national policies mandating the provision of sex education; as such, most decision-making occurs at the state or even the local level. Consequently, the provision of sex education and the quality and comprehensiveness of curricula used to do so are highly variable across the country, and are heavily influenced by the level of support or resistance in communities. This paper analyzes the experience of institutionalizing an evidence-based sex education in a large suburban school district in San Antonio, Texas, a socially conservative context. Understanding the politics of sex education is key to developing effective policies and strategies to ensure quality sex education programs are provided in public schools. However, there are no published papers documenting specific experiences with resistance to sex education in local communities in the USA. Given this, the strategies employed by opponents and the response by district officials can be informative for other school settings in the USA and around the world. Abbreviations: AFLA: Adolescent Family Life Act; CHAMPSS: Choosing And Maintaining effective Programs for Sex education in Schools Model; CSE: Comprehensive sexuality education; DTL/RTL: Draw the Line/Respect the Line; HSAE: Human Sexuality and Abstinence Education, the middle school sex education curriculum in NEISD prior to 2008; NEISD: North East Independent School District; SAFA: San Antonio Family Association; SHAC: School health advisory council; STI: Sexually transmitted infection; TEC: Texas Education Code; TPIA: Texas Public Information Act; USA: United States of America; UTHSC: University of Texas Health Science Center 相似文献