Iodine content of oyster shells

A report is given of the investigation of the iodine content of oyster shells taken from the reefs found in the Gulf of Mexico. The pulverized shells as sold on the market contain 200 to 300 parts per billion of iodine. Water soluble and alcohol soluble iodides appear to be absent. The granulated undried shells contain 500 parts per billion of iodine. Apparently there is a loss of iodine due to the temperature at which the pulverized shells are dried.     

高职高专学生健康素质现状和对策研究

以社会学的研究视角和研究方法,研究了高职高专学生的健康素质,具有统一性、实用性、创新性等特点。结果表明：铁岭师专高职与同一年级的学生健康素质的总体现状。男性低于女性、城镇男生低于乡村。建议：通过对体育课程、学生体质健康标准的测定等方式探索适合学生健康状况的干预对策。     

高校体育教学的现状分析和课程改革思路

目前传统的体育课程教学在教学内容、课程体系、教育质量评价和教学方法等方面仍存在不足,基于此,在多年的教学中,我们对现代化体育教学模式进行了探讨,在研究中发现,为了进一步改变陈旧的教学方法,应不断丰富教学内容,及时调整体育项目丰富选修教学内容,增强教学可接受性培养终身体育思想,构建多元化评价体系,采用计算机多媒体技术辅助教学,体现体育教学的现代化,积极有效地推进新一轮体育课程改革。     

Understanding Leadership in Major Sporting Events: The Case of the 2005 World Aquatics Championships

The purpose of this paper was to begin understanding leadership within a major sporting event. A case study of the 2005 Fédération Internationale de Natation (FINA) World Aquatics Championships was built by means of interviews and archival material, using a multi-stakeholder perspective. Findings highlighted that core elements of upper-management level leadership in events were best described by the multiple-linkage leadership theory, which includes task commitment, ability and role clarity, work organization, cooperation and mutual trust, resources and support, and external coordination as the six intervening variables. While charismatic and transformational leadership styles surfaced as contributing to the overall success of an event, the multiple-linkage leadership theory offered a more comprehensive understanding of leadership in major sporting events from a multi-stakeholder perspective.     

Children's heart rate reactivity responses to three school tasks

The effects of three routine classroom tasks upon heart rate reactivity were investigated with a sample of 30 typical fifth-grade children. Instructions for a mental arithmetic task, the mental arithmetic task itself, and silent reading were administered under standardized conditions, with a reward being offered for performance on the mental arithmetic task to enhance competition. Heart rate was individually monitored each second during these tasks, and data were collected on mental arithmetic performance and reading ability. Results indicated that some children showed large increases in their heart rates during the three tasks, and that these children should be considered as at-risk in terms of their cardiac health.     

Effects of achievement standards,choice, sex,and educational level on mathematical performance

The study assessed the effects of achievement standards, and choice of such standards, on mathematics performance in conditions where no tangible rewards were presented for reaching such standards. Elementary, junior high, and high school students performed a multiplication task in conditions where they chose standards, had standards imposed by an experimenter, or had no standards. Results demonstrated that high school students worked more multiplication problems when they chose standards than when identical standards were imposed by an experimenter or when no standards were present. Moreover, male students who chose standards worked more problems than did male students who had no standards; this effect was not found for female students.