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431.
Mónica Vallejo-Ruiz Antonio Fernández-Cano Manuel Torralbo Alexander Maz Luis Rico 《International Journal of Science and Mathematics Education》2008,6(2):313-327
This article offers an overview of mathematics education in Spain, analyzing the production of PhD theses over the last 30 years.
This period has been divided into four cycles that describe the evolution of Spanish research in the field of mathematics
education, together with changes in university and social politics. This paper also includes a forecast of the number of theses
that will be produced over the next 7 years, thus predicting the future progress and development of this area of research. 相似文献
432.
In most real-life bilateral teleoperators the available physical parameters are uncertain and the communications exhibit variable time-delays. In order to confront these situations and only assuming that a bound of the time-delays is known, the present work reports an adaptive controller which ensures asymptotic convergence of both position errors and velocities to zero, provided that a sufficient condition on the control gains is met. Compared to previous related works that only treated constant time-delays, the stability analysis does not rely on the cascade interconnection structure of the local and remote nonlinear dynamics and the linear interconnection map. Instead, the paper employs a different Lyapunov candidate function that incorporates a strictly positive term, the local and remote position error. Some simulations, in free space and interacting with a rigid wall, and experiments, using two nonlinear manipulators, illustrate the performance of the proposed control scheme in the presence of uncertain parameters and variable time-delays. 相似文献
433.
Xavier Bonfill Dimelza Osorio Margarita Posso Ivan Sol Gabriel Rada Ania Torres Marcelo García Dieguez Maricela Pia‐Pozas Luisa Díaz‐García Mario Tristn Omar Gandarilla David A. Rincn‐Valenzuela Arturo Martí Ricardo Hidalgo Daniel Simancas‐Racines Luis Lpez Ricardo Correa Antonieta Rojas‐De‐Arias Csar Loza
scar Gianneo Hector Pardo 《Health information and libraries journal》2015,32(4):276-286
434.
Ezequiel M. Gonçalves Catarina N. Matias Diana A. Santos Luis B. Sardinha Analiza M. Silva 《Journal of sports sciences》2015,33(6):634-640
Bioelectrical impedance spectroscopy (BIS) is an inexpensive and non-invasive technique to measure total body water (TBW), extracellular water (ECW), and intracellular water (ICW). The purpose of this study was to validate TBW, ECW and ICW assessed by BIS, using dilution techniques as the reference method (REF) in elite judo athletes. Thirty-two Portuguese elite male judo athletes were evaluated during a period of weight stability. TBW, ECW and ICW were assessed by BIS (Xitron 4000). Deuterium and bromide dilution techniques were used as the criterion method for measuring TBW and ECW, while ICW was calculated as the difference between the two. BIS explained 96%, 77% and 94% of the total variability from REFs for TBW, ECW and ICW, respectively. BIS also demonstrated high precision (ρ ≥ 0.88) and accuracy (Cb = 0.98), with a minimum concordance coefficient correlation of 0.87 for ECW. The mean bias demonstrated that BIS slightly overestimated the REF in 1.1 kg (2.3%), 0.3 kg (1.6%) and 0.8 kg (2.7%) for TBW, ECW and ICW, respectively. The 95% limits of agreement ranged from ?1.2 to 3.3 kg in TBW, from ?1.8 to 2.4 kg in ECW and from ?1.0 to 2.6 kg in ICW. A non-significant trend was found between the difference and the mean of reference and alternative methods. These findings highlight the efficacy of BIS as a valid non-biased tool for the assessment of TBW and its compartments in elite male judo athletes, during a period of weight stability. 相似文献
435.
Martínez Verónica Castejón Luis González-Pumariega Soledad 《Reading and writing》2022,35(7):1711-1730
Reading and Writing - Professional development (PD) of teachers working with students in the first years of learning to read is a privileged way of preventing initial reading difficulties and its... 相似文献
436.
José Luis Ramírez Romero Peter Sayer Elva Nora Pamplón Irigoyen 《International journal of qualitative studies in education》2014,27(8):1020-1043
Over the past 15?years, many state governments in Mexico have initiated local programs to introduce English at the primary school level. In 2009, the Mexican Ministry of Education formalized the Programa Nacional de Inglés en Educación Básica (PNIEB) as part of the national curriculum, based on the argument that increasing the number of English speakers in Mexico is necessary for the country to be globally competitive and to follow the trend in other developing economies of augmenting English instruction in public education. This paper focuses on the implementation of PNIEB and the state programs that preceded it. The authors document the practices and challenges associated with the program based on data collected from interviews with the main stakeholders involved (students and parents, teachers, school principals, and program coordinators) and from classroom observations. The total data-set consisted of over 200 interviews and classroom observations spread over several years from 2008 to 2012. Several challenges are described, including the development of materials, the role of English in relation to other subject areas, and the training of teachers who often speak English but have uneven formal preparation. The status of the teachers, both as second-class citizens within the schools and the instability and irregularities with their contracts, was identified as the most significant challenge to the successful implementation of the programs. 相似文献
437.
Marcos Sanchez-Elez Inmaculada Pardines Pablo Garcia Guadalupe Miñana Sara Roman Margarita Sanchez Jose Luis Risco 《Journal of Science Education and Technology》2014,23(1):15-25
The use of new technologies in higher education has surprisingly emphasized students’ tendency to adopt a passive behavior in class. Participation and interaction of students are essential to improve academic results. This paper describes an educational experiment aimed at the promotion of students’ autonomous learning by requiring them to generate test type questions related to the contents of the course. The main idea is to make the student feel part of the evaluation process by including students’ questions in the evaluation exams. A set of applications running on our university online learning environment has been developed in order to provide both students and teachers with the necessary tools for a good interaction between them. Questions uploaded by students are visible to every enrolled student as well as to each involved teacher. In this way, we enhance critical analysis skills, by solving and finding possible mistakes in the questions sent by their fellows. The experiment was applied over 769 students from 12 different courses. Results show that the students who have actively participated in the experiment have obtained better academic performance. 相似文献
438.
Alberta M. Gloria Jeanett Castellanos Theresa A. Segura‐Herrera Melissa Mayorga 《Journal of College Counseling》2010,13(2):126-140
This study assessed the influence of cultural orientation and cultural fit of 121 Latina undergraduates' help‐seeking attitudes. Mexican and Anglo orientation, cultural congruity, and perceptions of the university environment did not predict help‐seeking attitudes; however, differences emerged by class standing and self‐reported previous counseling experience. Implications for university counselors are provided. 相似文献
439.
English language abstract not available at time of publication. 相似文献
440.