``Weighing' the Earth: a Newtonian Test and the Origin of an Anachronism

The measure G, the universal gravitational constant, is attributed to Henry Cavendish. Nevertheless, the intention of the English physicist was to measure the density of the earth, which at that time was necessary in order to decide between different theories about the composition of this planet. G was measured much later. In this article I will try to explain how Cavendish accomplished the famous experiment and what his results were. Likewise, I will consider the problems that can arise in the scientific training of students from maintaining anachronisms such as this.     

An assessment of the sources of the reversal error through classic and new variables

We present two empirical studies with 241 and 211 pre-service teachers that evaluate the explanatory power of word order matching and static comparison as models for the reversal error. We used tasks consisting of generating an algebraic equation representing a comparison given in a verbal statement. We introduce the types of magnitude involved in the statement as variables of analysis, something that was not previously tackled in previous works. Our results show that there are no statistical differences in the production of reversal errors depending on the information included in the name used to designate the variable, and that there are statistical differences depending on the syntactic configuration as well as the type of magnitude involved in the statement. The interpretation of these results indicates that both word order matching and static comparison have some potential as explanatory models for the reversal error, and that neither one of them, alone, is enough to completely explain the phenomenon.     

What if privatising higher education becomes an issue? The case of Chile and Mexico

Over the last 30 years, Chile and Mexico have been implementing neoliberal policies to reform their higher education systems. This report compares the development and impact of those policies within three main areas in both countries, namely: (1) trends and characteristics of the growing private higher education sector, (2) commercialisation and business-like trends that private academia is experiencing and, finally, (3) it discusses how all this has created tensioning situations with assessment and accrediting agencies to ensure quality in their private higher education systems. This study shows that private higher education is facing the following challenges in both nations: (1) an uncritical implementation of neoliberal policies, (2) that there is a very unregulated legislation that has allowed many private institutions to profit within loopholes in the law, (3) that quality has become a central concern and some of the mechanisms applied to correct it have not been effective, showing a lack of a comprehensive system of quality assessment, and (4) that enrolment has grown but with several mismatches that challenge the initial goal of advancing economic development through human resources capacities. Alternative policies are discussed.     

A reading-level match study of phonemic processes underlying reading disabilities in a transparent orthography

The current study examined the relationship in Spanish (i.e., a transparent orthography) between different levels of phonological awareness and reading disabilities. In addition, the strategies used by the children when they resolved phoneme segmentation and reversal tasks were analyzed. A sample of 133 subjects were selected and organized in three different groups: (1) A group of 45 reading-disabled children, (2) A comparison group of 44 normal readers matched in age with the reading disabled, and (3) A reading level match group of 44 younger normal readers at the same reading level as the reading disabled. Three phonological awareness tasks were used to measure levels of intrasyllabic and phonemic awareness. The reading disabled group was equivalent to the younger reading level-matched control group in the odd-word-out task. However, there were differences in the phonemic tasks (e.g., phoneme segmentation and reversal) because the reading disabled group performed more poorly than the younger children. Overall, the children matched in age with the reading disabled group were superior in all phonological awareness tasks. There were differences between the groups when the strategies used by the children were analyzed.     

Spelling difficulties in Spanish-speaking children with dyslexia / Dificultades de escritura en niños españoles con dislexia

In addition to reading difficulties, a significant proportion of developmental dyslexics have spelling problems, which persist into adulthood. Studies carried out in languages with opaque orthographies have found that dyslexics frequently make phonological substitutions when spelling and have difficulties in developing orthographic representations of irregular words. Those errors seem to derive from an excessive use of phonological codes when writing. Minimal research in Spanish (relatively transparent orthography) about the relationship between dyslexia and spelling difficulties has been carried out to date. In this study, 19 Spanish-speaking developmental dyslexics (from 7 to 11 years old) and 28 controls (from 6 to 11 years old, distributed in two groups, one matched for age and the other for reading level with the dyslexics) performed a dictation task of 80 stimuli with different levels of orthographic consistency, in order to discover the codes they use in the writing process. Results showed that Spanish children with dyslexia made significantly more spelling errors, especially among the ruled and irregular words. These findings are consistent with the idea that these children have difficulties in developing orthographic representations and use phonological codes more frequently than non-dyslexics, resulting in phonologically plausible errors when writing irregular words. These results have important implications for the treatment of spelling difficulties in children with dyslexia, highlighting the need to focus on the correct acquisition of grapheme-phoneme conversion rules as well as the development of appropriate orthographic representations.     

The contribution of the University of California Cooperative Extension to California's agricultural production

ABSTRACT

Purpose

This paper is concerned with the impact of the University of California Cooperative Extension (UCCE) on regional productivity in California agriculture. UCCE is responsible for agricultural research and development (R&D), and dissemination of agricultural know-how in the state.     

Relationship between physiological parameters and performance during a half-ironman triathlon in the heat

Abstract

Triathlon is a popular outdoor endurance sport performed under a variety of environmental conditions. The aim of this study was to assess physiological variables before and after a half-ironman triathlon in the heat and to analyse their relationship with performance. Thirty-four well-trained triathletes completed a half-ironman triathlon in a mean dry temperature of 29 ± 3ºC. Before and within 1 min after the end of the race, body mass, core temperature, maximal jump height and venous blood samples were obtained. Mean race time was 315 ± 40 min, with swimming (11 ± 1%), cycling (49 ± 2%) and running (40 ± 3%) representing different amounts of the total race time. At the end of the competition, body mass changed by ?3.8 ± 1.6% and the change in body mass correlated positively with race time (r = 0.64; P < 0.001). Core temperature increased from 37.5 ± 0.6ºC to 38.8 ± 0.7ºC (P < 0.001) and post-race core temperature correlated negatively with race time (r = ?0.47; P = 0.007). Race time correlated positively with the decrease in jump height (r = 0.38; P = 0.043), post-race serum creatine kinase (r = 0.55; P = 0.001) and myoglobin concentrations (r = 0.39; P = 0.022). In a half-ironman triathlon in the heat, greater reductions in body mass and higher post-competition core temperatures were present in faster triathletes. In contrast, slower triathletes presented higher levels of muscle damage and decreased muscle performance.     

The relationship between approaches to teaching, approaches to e-teaching and perceptions of the teaching situation in relation to e-learning among higher education teachers

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.     

Crime Control Strategies in School: Chicanas’/os’ Perceptions and Criminalization

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.