Effects of student-generated drawing and imagination on science text reading in a computer-based learning environment

Educational technology research and development - The purpose of this study was to examine the effects of student-generated drawing and imagination on learning recall, learning transfer, and...     

Notices

In this study, we examined whether a preparatory perceptual ‘anchoring’ technique would enhance the reproducibility (test–retest reliability) of adolescent children in their ability to self-regulate their exercise output on the basis of their effort perceptions. Forty-one adolescents aged 12.6±0.7 years (mean±s), randomly assigned to either an anchor or non-anchor group, undertook two identical production trials (three 3-min cycle ergometer bouts at levels 3, 6 and 8 of the Children's Effort Rating Table) over 8 days. Before each trial, the anchor group received an experiential (exercise) trial intended to provide a frame of reference for their perceived exertions. The test–retest reproducibility of the heart rates and power outputs produced during the production trials was assessed using intraclass correlation coefficients and 95% limits of agreement analysis. For the anchor group, the intraclass correlation coefficients ranged from 0.68 to 0.81 for heart rate and from 0.39 to 0.86 for power output. For the non-anchor group, they were generally higher: 0.86 to 0.93 and 0.81 to 0.95 for heart rate and power output, respectively. The 95% limits of agreement indicated no marked differences between the two groups in the amount of bias and within-subject error. The results suggest that among these adolescents, the implementation of an experiential anchoring protocol had no positive effect on the reproducibility of their exercise regulation during prescribed cycling.     

Fluid and electrolyte balance in elite male football (soccer) players training in a cool environment

There are few data in the published literature on sweat loss and drinking behaviour in athletes training in a cool environment. Sweat loss and fluid intake were measured in 17 first-team members of an elite soccer team training for 90 min in a cool (5°C, 81% relative humidity) environment. Sweat loss was assessed from the change in body mass after correction for the volume of fluid consumed. Sweat electrolyte content was measured from absorbent patches applied at four skin sites. Mean (?± s) sweat loss during training was 1.69?±?0.45 l (range 1.06?-?2.65 l). Mean fluid intake during training was 423?±?215 ml (44?-?951 ml). There was no apparent relationship between the amount of sweat lost and the volume of fluid consumed during training (r ² = 0.013, P = 0.665). Mean sweat sodium concentration was 42.5?±?13.0 mmol?·?l^?1 and mean sweat potassium concentration was 4.2?±?1.0 mmol?·?l^?1. Total salt (NaCl) loss during training was 4.3?±?1.8 g. The sweat loss data are similar to those recorded in elite players undergoing a similar training session in warm environments, but the volume of fluid ingested is less.     

A rapid,inexpensive surface treatment for enhanced functionality of polydimethylsiloxane microfluidic channels

A rapid, inexpensive method using alkoxysilanes has been developed to selectively coat the interior of polydimethylsiloxane (PDMS) microfluidic channels with an integral silicaceous layer. This method combines the rapid prototyping capabilities of PDMS with the desirable wetting and electroosmotic properties of glass. The procedure can be carried out on the open faces of PDMS blocks prior to enclosure of the channels, or by flowing the reagents through the preformed channels. Therefore, this methodology allows for high-throughput processing of entire microfluidic devices or selective modification of specific areas of a device. Modification of PDMS with tetraethoxysilane generated a stable surface layer, with enhanced wettability and a more stable electroosmotic flow rate than native PDMS. Modification of PDMS with 3-aminopropyltriethoxysilane generated a surface layer bearing amine functionalities allowing for further chemical derivatization of the PDMS surface.     

Children's participation in foster care hearings

Purpose

Empirical research regarding potential risks and benefits of children's participation in the legal system generally, and in the child dependency legal system in particular, is sparse and mostly characterized by small studies without comparison groups. The current study was designed to address the following questions regarding children's participation in dependency court hearings: (1) Is attending court harmful to children? (2) Is attending court beneficial to children? (3) Is judicial behavior with the child in the courtroom related to potential harms or benefits? and (4) Are there age differences in children's reactions?

Method

The authors measured children's reactions to attending dependency review hearings (n = 43) and compared them to a sample of children who did not attend their hearings (n = 50). One to 2 weeks following review hearings, both groups of children were interviewed about their reactions to the court process.

Results

Children who attended their hearings reported more positive feelings about the dependency process (e.g., trust in judge, perceived fairness, and more comfort with their guardians ad litem and caseworkers). For children who attended, there was no evidence of high distress immediately preceding or following their hearings. Court observations revealed that more active engagement by judges was related to positive responses from the children. Most children, including both children who attended hearings and those who did not, believed that all children should be able to attend their hearings.

Conclusion

Overall, the findings suggest that policies encouraging children's attendance at dependency hearings are viewed positively by and not harmful to children.     

The Development of Message Evaluation Skills in Young Children

The goal of this research was to learn if young children overestimate message quality because they evaluate their knowledge or assumptions about the intended meaning of the message, rather than its literal meaning. 2 experiments were conducted with preschoolers (4 years) and kindergartners (5-6 years). Second graders (8 years) also participated in the first experiment. Children evaluated the communicative quality of informative, ambiguous, and ineffective picture messages in a simple communication game. In the first experiment, children knew the intended referent when they evaluated the message. The results showed that younger children overestimated the informativeness of the ambiguous and ineffective messages, while older children evaluated message quality accurately, even though they knew the intended meaning. In the second experiment, younger children detected more of the message ambiguities when they did not know the target referent than when they were informed of the intended interpretation. The results suggest that young children overestimate message quality because they evaluate their interpretation of the message rather than its literal meaning.     

Assessing the Impact of School-Based Marketing Efforts: A Case Study of a Foreign Language Immersion Program in a School-Choice Environment

The marketization of K–12 education has led to an increase in school-based marketing efforts. Relatively little research, however, has examined how public schools market themselves, who is involved in marketing, and how these marketing efforts impact key stakeholders, including school administrators, teachers, students, and parents. We explore these questions in this qualitative study of school-based marketing efforts at South Boulevard,¹Because of the long and public history of desegregation litigation associated with the school and with the school district, we use real place names throughout the paper. Thus, we disclose both the school's name—South Boulevard Foreign Language Academic Immersion Magnet—and the name of the city in which the school is located—Baton Rouge, Louisiana, in order to maintain the authenticity of the case and the findings. a foreign language immersion magnet elementary school in East Baton Rouge Parish, Louisiana. Analysis of data from participant observation and in-depth interviews with key stakeholders reveals that administrators, teachers, parents, and students actively participated in marketing and recruiting, and that these efforts were associated with a number of implicit and explicit costs. Introducing two concepts from the business literature—business-level strategy and brand communities—yields a number of observations and policy questions. Finally, the shifting role of parents and administrators in an increasingly market-like school-choice environment is discussed.