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151.
152.
Scientific publishing in mathematics and physics (as in other exact sciences) is rapidly changing, and it is important to identify and predict relevant changes and their potential consequences. To understand such changes, the authors begin with a brief history of scientific publishing and the rise of digital publishing. The study presents a qualitative comparison of the basic features of traditional and digital forms of publications (books, journals, libraries and databases, archives, webinars, forums, digital learning materials), on the basis of which relevant changes (specific for mathematics and physics) are identified and predicted. Several tables describing the most popular and useful scientific online tools for scientists, professors, students, and engineers are listed. 相似文献
153.
Irene Esteban-Cornejo Sonia Gómez-Martínez Carlos M. Tejero-González Ruth Castillo Ricardo Lanza-Saiz German Vicente-Rodríguez 《Journal of sports sciences》2013,31(17):1596-1603
AbstractThe aim of this report was to examine the associations between some characteristics (i.e., structure and number) of extracurricular physical activity (EPA) and cognitive performance in adolescents. A total of 1662 adolescents (880 girls; 13.0–18.5 years) from 5 Spanish cities (Granada, Madrid, Murcia, Santander and Zaragoza) were included in this study. Structure (organised and non-organised) and number of EPAs, and participation at vigorous intensity during EPA were self-reported. Cognitive performance (verbal, numeric and reasoning abilities, and an overall score) was measured with the “SRA-Test of Educational Ability”. Results showed that vigorous EPA was positively associated with all cognitive variables. Adolescents who practiced an organised EPA had higher scores in 3 of the 4 cognitive variables than those who practiced a non-organised EPA (all P < 0.05). Likewise, the group who participated in more than one EPA had higher cognitive performance in all variables than the group who participated in only one EPA (all P < 0.05). Regardless of potential confounder variables, including vigorous EPA, both structure and number of EPAs were each other independently associated with cognitive performance. Therefore, structure and number of EPAs may positively influence cognitive performance in adolescents. Participating in multiple, organised EPA may have benefits for cognitive performance. 相似文献
154.
Antoni Aguiló Marta Monjo Carlos Moreno Pau Martinez Sonia Martínez 《Journal of sports sciences》2013,31(17):1659-1669
AbstractThe aim of this study was to determine whether the highest vitamin C supplementation associated with complete bioavailability influences the plasma and blood mononuclear cell IL-6 and IL-10 response to exercise. A double-blinded study of supplementation with vitamin C was performed. After 15 days of supplementation with vitamin C (500 mg · day?1, n = 16) or a placebo (n = 15), participants in the study completed a 15-km run competition. Blood samples were taken before and after competition. Oxidative stress markers, antioxidants, cortisol, IL-6 and IL-10 were determined in plasma or serum. IL-6 and IL-10 protein and mRNA levels were measured in blood mononuclear cells. Although higher plasma and blood mononuclear cell vitamin C levels were observed in the supplemented group when compared with the placebo one, the two groups showed identical exercise-induced changes in all the measured parameters. Exercise induced increased IL-6 and IL-10 levels in plasma and blood mononuclear cells. IL-6 and IL-10 mRNA levels in blood mononuclear cells increased after the competition. After recovery, IL-6 mRNA returned to basal levels and IL-10 mRNA levels remained elevated. In conclusion, exercise induced increased IL-6 and IL-10 production in blood mononuclear cells. However, vitamin C supplementation did not influence IL-6 and IL-10 response to exercise. 相似文献
155.
Carlos González 《Instructional Science》2012,40(6):975-998
This study extends prior research on approaches to teaching and perceptions of the teaching situation by investigating these elements when e-learning is involved. In this study, approaches to teaching ranged from a focus on the teacher and the taught content to a focus on the student and their learning, resembling those reported in previous investigations. Approaches to e-teaching ranged from a focus on information transmission to a focus on communication and collaboration. An analysis of perceptions of the teaching situation in relation to e-learning identified key themes influencing adopted approaches: control of teaching, institutional strategy, pedagogical and technological support, time required, teacher skills for using e-learning, and student abilities and willingness for using learning technology. Associations between these elements showed three groups of teachers: one focusing on transmission of information teaching both face-to-face and online while having a general negative perception of the teaching situation in relation to e-learning; a second focusing on student learning both face-to-face and online while having a general positive perception; and a third presenting unexpected patterns of associations. These results may be helpful for supporting different groups of teachers in employing e-learning in their on-campus units of study. At the same time, further research is proposed for inquiring into specific approaches in different disciplines and different university contexts. 相似文献
156.
High schools throughout the United States experience problems with violence, drugs, and crime. School administrators have
responded with policies and strategies designed to prevent school violence such as zero tolerance approaches, partnerships
with law enforcement agencies, security camera installations, and hiring additional security personnel to monitor students.
The purpose of this research is to determine how Chicanas/os and school officials perceive and experience these techniques
as part of a broader process of criminalization. In addition, using qualitative data we explore perceptions of safety and
experiences with victimization. Qualitative data include interviews (with high school students, school administrators, and
security personnel), an evaluation of a Chicana/o-centered program, and participant observations in a predominantly Chicana/o
high school located in the Southwest. Findings show some students find the new techniques to be invasive and hostile and others
find school security measures as providing a sense of security; and administrators and teachers generally find value in the
new approaches. From a LatCrit perspective, we argue that Chicana/o and Mexicana/o experiences are set within a context of
racialized space where criminalization is one possible outcome of school security measures. 相似文献
157.
Sandra Patricia Rojas Rojas Alejandra Meneses Emilio Sánchez Miguel 《International Journal of Science Education》2013,35(13):1827-1847
ABSTRACTReading is a tool that promotes the learning of science across schooling. Scientific texts are conceptually and linguistically complex, especially for students from low-income contexts because they have neither the experience with the language nor the literacy skills to face the challenges of scientific knowledge. This study used a mix method approach to compare the cognitive scaffolding practiced by teachers during science reading activities in high- and low-performing schools. Three teachers and 141 fourth grade students from low socioeconomic background schools participated in 48 class sessions. Classes were video-recorded and transcribed. The data were analyzed using Sanchez’ Pedagogic Practice Analysis System. The results show that teachers from both types of schools continuously use reading as a tool for learning. The effective teacher uses reading with non-invasive scaffolding and varied verbal participation to elaborate knowledge, promoting literal and inferential comprehension and more opportunities for the students to construct knowledge. By contrast, less effective teachers use reading with invasive scaffolding and little verbal participation of the students to consolidate knowledge, promoting mainly literal comprehension. This study shed light on different approaches teachers use to foster reading comprehension for science learning. 相似文献
158.
Carlos Nevarez J. Luke Wood 《Educational Studies A Journal of the American Educational Studies Association》2013,49(3):266-280
The 15th Anniversary of the Los Angeles riots serves as an impetus to continue efforts in addressing how institutionalized theories, norms, and practices in schools and society lead to social, political, economic, and educational inequalities. The challenges of school inequalities continue to be chronic and remain unresolved through traditional practices, scholarship, theory, and professional training of school leaders. The intersection between urban school leadership and diversity is examined through critically reviewing hurdles that school leaders encounter, such as low socioeconomics, low representation of leaders of color, violence, and academic underachievement. We argue that urban school leaders can change school conditions by facilitating the development of proficient and culturally-competent teachers and administrators, and creating a positive school climate. Two existing frameworks were used to guide the researchers in the development of the Leadership in Diversity Continuum Model (LDCM) that can help guide leaders in their efforts to transform schools through an introspective analysis of their own identity development. 相似文献
159.
160.
Carlos Gómez Filomena Sos Cristina B. Randall Encarna Vaquero 《Infancia y Aprendizaje》2013,36(56):105-122
ResumenSe ha realizado un estudio observacional con metodología etológica en niños de 4–5 años: Un grupo de 5 Ss. procedentes de una Casa Cuna y otro grupo de 7 Ss. procedentes de un ambiente familiar. El muestreo se llevó a cabo en un hábitat común para ambos grupos: el recreo de un preescolar, ubicado en otra zona, y en condiciones de juego libre, aunque controlado por monitores adultos. Los resultados obtenidos sugieren la existencia de diferencias entre ambos grupos, que podrían implicar una manera diferente de integración social de los niños cuyo hábitat primario no es la casa familiar, aunque no es posible establecer una relación de causalidad directa con la institucionalización. 相似文献