CONSTRUCTING KNOWLEDGE ABOUT THE NOTION OF LIMIT IN THE DEFINITION OF THE HORIZONTAL ASYMPTOTE

Processes of knowledge construction are investigated. A learner is constructing knowledge about the notion of limit in the definition of the horizontal asymptote. The analysis is based on the dynamically nested epistemic action model for abstraction in context. Different tasks are offered to the learner. In her effort to perform the different tasks, the learner encounters a situation of conflict between her concept image of the horizontal asymptote and the concept definition. The model of abstraction in context is used to analyze two new constructions of knowledge for the learner, which permit her to reconsider her concept image and to conceptually understand the definition of the horizontal asymptote.     

Filial Daughter, Woman Warrior, or Identity-Seeking Fairytale Princess: Fostering Critical Awareness Through Mulan

New immigrants and their children need to develop the ability to reconcile perceived dissonances between the worldviews of their parents and grandparents and those of their peers. This pursuit is made more difficult when they find that their newly adopted homeland misrepresents their cultural heritage. This article examines the historical evolution of the Mulan ballad along with issues of cultural authenticity in folktales. The analysis of three English adaptations of the ballad demonstrates clear contrasts that either support or complicate identity formation. We suggest that this text set could be used to inform critical classroom discussions regarding the plurality and fluidity of culture as well as those pertaining to Chinese heritage and cultural authenticity.     

Print Collections Management in the Wake of Digitization

Ross Housewright, a Research Analyst at Ithaka S+R (http://www.ithaka.org/ithaka-s-r/) delivered the keynote address at the E-Resources Symposium at Mississippi State University on September 16, 2010. Housewright challenged traditional thinking about collection and preservation activities in the academic library setting. He introduced two important Ithaka S+R programs—the Faculty Survey and the What to Withdraw Framework—and discussed how they can assist serials librarians struggling to maintain the proper balance between patron needs, budget pressures, and the library's mission to preserve materials in the age of mixed digital and print collections.     

Carbohydrates and fat for training and recovery

An important goal of the athlete's everyday diet is to provide the muscle with substrates to fuel the training programme that will achieve optimal adaptation for performance enhancements. In reviewing the scientific literature on post-exercise glycogen storage since 1991, the following guidelines for the training diet are proposed. Athletes should aim to achieve carbohydrate intakes to meet the fuel requirements of their training programme and to optimize restoration of muscle glycogen stores between workouts. General recommendations can be provided, preferably in terms of grams of carbohydrate per kilogram of the athlete's body mass, but should be fine-tuned with individual consideration of total energy needs, specific training needs and feedback from training performance. It is valuable to choose nutrient-rich carbohydrate foods and to add other foods to recovery meals and snacks to provide a good source of protein and other nutrients. These nutrients may assist in other recovery processes and, in the case of protein, may promote additional glycogen recovery when carbohydrate intake is suboptimal or when frequent snacking is not possible. When the period between exercise sessions is <8?h, the athlete should begin carbohydrate intake as soon as practical after the first workout to maximize the effective recovery time between sessions. There may be some advantages in meeting carbohydrate intake targets as a series of snacks during the early recovery phase, but during longer recovery periods (24?h) the athlete should organize the pattern and timing of carbohydrate-rich meals and snacks according to what is practical and comfortable for their individual situation. Carbohydrate-rich foods with a moderate to high glycaemic index provide a readily available source of carbohydrate for muscle glycogen synthesis, and should be the major carbohydrate choices in recovery meals. Although there is new interest in the recovery of intramuscular triglyceride stores between training sessions, there is no evidence that diets which are high in fat and restricted in carbohydrate enhance training.     

Boys Outperforming Girls: an 8‐year cross‐sectional study of attainment and self‐esteem in Year 6

This 8‐year cross‐sectional study measured the self‐esteem, reading and mathematical attainments of eight cohorts of Year 6 children. A total of 1488 children (737 boys, 751 girls) in five randomly selected primary schools within one Local Education Authority (LEA) comprised the sample to which the Lawseq questionnaire (Lawrence, 1982), Mathematics 11 (NFER, 1985) and the Primary Reading Test Level 2 (France, 1981) were administered. Differences in attainment related to gender were found in mathematics, but not in reading, with boys significantly outperforming girls (at the 5% level). The percentage of boys who scored significantly above the mean in mathematics and significantly below the mean in reading contrasted with the girls’ more compressed scores in the middle range. The national test data for Cohorts 7 and 8 followed the national pattern with girls outperforming boys. Boys had significantly higher self‐esteem than the girls (at the 0.1% level). Correlation coefficients between Lawseq and mathematics and reading mean scores for boys and girls were all significant at the 0.1% level. The findings are discussed in relation to the current debate concerning the low performance of boys.     

Exploring the phase space of a system of differential equations: different mathematical registers

We describe and analyze a situation involving symbolic representation and graphical visualization of the solution of a system of two linear differential equations, using a computer algebra system. Symbolic solution and graphical representation complement each other. Graphical representation helps to understand the behavior of the symbolic solution. Together with it, the symbolic solution and its analysis are needed to understand the graphical representation and to overcome the limiting constraints of the CAS. The study described in this paper points out the importance of flexibility in building connections between different mathematical registers, together with the fact that the balance between the usage of symbolic representations and of graphical representations can be very different from one student to the other. Research supported by Israel Science Foundation, grant number 1340/05.     

Exercise-related transient abdominal pain secondary to median arcuate ligament syndrome: a case report

Exercise-related transient abdominal pain is a common entity in young athletes. An uncommon aetiology of this type of pain is median arcuate ligament syndrome. This article details an 18-year-old field hockey player who presented with a 1-year history of exercise-related transient abdominal pain. Despite a trial of preventative strategies, the patient’s pain persisted, prompting surgical intervention. Following a laparoscopic median arcuate ligament release, the patient’s symptoms resolved. Therefore, when exercise-related transient abdominal pain persists despite precautionary measures, median arcuate ligament syndrome should be considered.     

Carbohydrates and fat for training and recovery

An important goal of the athlete's everyday diet is to provide the muscle with substrates to fuel the training programme that will achieve optimal adaptation for performance enhancements. In reviewing the scientific literature on post-exercise glycogen storage since 1991, the following guidelines for the training diet are proposed. Athletes should aim to achieve carbohydrate intakes to meet the fuel requirements of their training programme and to optimize restoration of muscle glycogen stores between workouts. General recommendations can be provided, preferably in terms of grams of carbohydrate per kilogram of the athlete's body mass, but should be fine-tuned with individual consideration of total energy needs, specific training needs and feedback from training performance. It is valuable to choose nutrient-rich carbohydrate foods and to add other foods to recovery meals and snacks to provide a good source of protein and other nutrients. These nutrients may assist in other recovery processes and, in the case of protein, may promote additional glycogen recovery when carbohydrate intake is suboptimal or when frequent snacking is not possible. When the period between exercise sessions is < 8 h, the athlete should begin carbohydrate intake as soon as practical after the first workout to maximize the effective recovery time between sessions. There may be some advantages in meeting carbohydrate intake targets as a series of snacks during the early recovery phase, but during longer recovery periods (24 h) the athlete should organize the pattern and timing of carbohydrate-rich meals and snacks according to what is practical and comfortable for their individual situation. Carbohydrate-rich foods with a moderate to high glycaemic index provide a readily available source of carbohydrate for muscle glycogen synthesis, and should be the major carbohydrate choices in recovery meals. Although there is new interest in the recovery of intramuscular triglyceride stores between training sessions, there is no evidence that diets which are high in fat and restricted in carbohydrate enhance training.     

Uninterrupted,Sustained, Silent Reading: the rhetoric and the practice

The study investigated whether the rhetoric of uninterrupted, sustained, silent reading (USSR/ERIC) was evident in primary classrooms where the practice was professed to operate. Nine primary schools in three different counties were surveyed, and the sample included both urban and rural schools. Structured interviews were undertaken with the headteacher and two members of staff in each school, followed by classroom observations, focusing on what do teachers do in practice during USSR/ERIC. From both interviews and observations it was evident that teacher interpretation of how the sessions should be organised and managed was not specifically that of the rhetoric, with only one school closely following the prescribed model. Whilst the value of a quiet reading time was generally acknowledged and much good practice observed in sessions, it would appear that many models which operate under the guise of ‘uninterrupted sustained silent reading’ are governed by teacher preference or pupil need.