Listening to excluded young people's experiences of e-safety and risk

This article reports on excluded young people's experiences with and management of e-safety and risk. It has importance in exploring these concerns given that excluded young people's voices are very often absent in education and technology research and yet they are potentially more at risk when using Information and Communication Technologies than middle-class young people for whom the risks may be lower. The findings are drawn from an analysis of the in-depth qualitative interviews carried out with 13 permanently and temporarily excluded young people between the ages of 12–15 in a Pupil Referral Unit in South East England. The accounts given by this group of young people suggest that the strategies they deploy to manage their safety online are underdeveloped and inadequate. This points in turn to a need for further interventions to foster and develop these young people's strategies to avoid online risk as part of more general initiatives to develop digital literacy.     

原子吸收法和分光光度法检测废液中铁的比较

分别用火焰原子吸收法和1,10-菲啰啉分光光度法测定铬铁废液中铁的总量.绘制了两种方法的标准曲线,测定了空白值、加标回收率和标准样品.两种方法的空白值都比较稳定,相关性以及斜率等数值都很接近,它们的准确度都比较好,相对标准偏差分别为1.2%和2.6%.两者的平均回收率分别为108%和94%,基本符合实验要求.因此,两种方法的测定结果都在真值允许范围内,它们的标准曲线,精密度和准确性都比较好.两种方法的结果通过t检验,无显著性差异.两者都适用于低浓度的铁溶液,但分光光度法灵敏度稍高.     

基于LD3320语音遥控器的设计与实现

自然语音作为人机交互具有广泛的应用前景。介绍了基于非特定人语音芯片LD3320的语音遥控器结构和实现方法。该语音遥控器利用STC89C52单片机作为主控器,控制LD3320对语音识别与处理,然后根据语音指令产生相应红外脉冲序列,替代按键式红外遥控器,实现对电器的语音遥控。     

浅谈面向应用型人才培养的单片机课程的改革

北部湾的快速发展需要大量应用型人才,而传统教育方式难以满足企业对单片机人才的需求.针对该难题,提出明确单片机地位、科学选型、有针对性加强预备知识、教学内容分层、通过网络项目超市加强实践环节的解决思路.实践表明,根据单片机课程特点和学生实际情况开展教学改革,能够提高学生的学习效率,更好的培养应用型人才.     

近十年高等教育自学考试学习支持服务研究述评

近十年来,学术界在高等教育自学考试学习支持服务的定义、重要性、存在的问题等方面进行了研究。这些研究取得了一定的成绩,但同时也存在着一些不足。本文对高等教育自学考试学习支持服务的研究成果进行归纳、总结,根据存在的问题提出解决对策,以期推动高等教育自学考试学习支持服务实践和研究的发展。     

《新华字典》第11版对第10版在释义方面的修订

《新华字典》第11版对第10版进行了全面的修订,质量有了大幅度提升。释义修订是此次修订的重点。可分为义项的增补、义项的删减、释文的修改三个大类。该文分类举例并分析第11版在释义方面的修订情况,以期促进《新华字典》的进一步完善。     

The Disappearance of the Perfect 10: Evaluating Rule Changes in Women's Artistic Gymnastics

The 2004 Olympic Games saw a range of judging scandals in the sport of artistic gymnastics that prompted the International Gymnastics Federation to make changes to the sport's judging system. Therefore, following these games, the International Gymnastics Federation reworked the gymnastics scoring system, where the most prominent change was the removal of the ‘perfect 10’ as the highest score possible, to be replaced by an open-ended scoring system. The goal of this paper is to examine the effectiveness of the open-ended system that was introduced in 2006 through examining some of the sport's key values – an approach loosely aligned with broad internalism. It is suggested that the dual purposes of analysing what is achieved and the manner of achieving it are key values of the sport and are differentiated through the way judging utilises two categories known, in gymnastics, as ‘difficulty’ and ‘artistry’. This paper argues that the method of judging ‘difficulty’ is an improvement on previous judging methods. Our analysis of the definition and judging of ‘artistry’ in artistic gymnastics, however, reveals a less certain result.     

Environmental conditions,air pollutants,and airway cells in runners: A longitudinal field study

Abstract

Runners have increased numbers of neutrophils in the airways at rest and after exercise compared with sedentary individuals. The aim of this study was to determine whether Mediterranean seasonal changes in temperature, humidity or airborne pollutants affect the airway cells of runners training outdoors in an urban environment. In nine male amateur runners, cell composition, apoptosis, and inflammatory mediators were measured in induced sputum collected at rest (baseline) and the morning after races held in the fall (21 km), winter (12 km), and summer (10 km). Concentrations of air pollutants were below the alert threshold at all times. Neutrophil differential counts tended to increase after all races (P = 0.055). Apoptosis of neutrophils increased with ozone (P < 0.005) and particulate matter <10 μm (PM₁₀) (P < 0.05) exposure. Bronchial epithelial cell counts were low at all times and weakly correlated with ozone and PM₁₀ concentrations. Apoptotic bronchial epithelial cells increased after all races (P < 0.05). Inflammatory mediators in induced sputum were low at baseline and after the races, and correlated with neutrophil differential counts only at rest. In conclusion, apoptosis of airway cells in runners appears to be affected by both exercise and environmental conditions. Apoptosis of neutrophils increased with exposure to environmental pollutants while apoptosis of bronchial epithelial cells increased after intense exercise. Since no relationship was observed between neutrophil counts and inflammatory mediators 20 h after races, airways inflammation at this time point appears blunted in healthy runners and little affected by exposure to mild seasonal changes and airborne pollutants.     

Vitamin C supplementation does not influence plasma and blood mononuclear cell IL-6 and IL-10 levels after exercise

Abstract

The aim of this study was to determine whether the highest vitamin C supplementation associated with complete bioavailability influences the plasma and blood mononuclear cell IL-6 and IL-10 response to exercise. A double-blinded study of supplementation with vitamin C was performed. After 15 days of supplementation with vitamin C (500 mg · day^?1, n = 16) or a placebo (n = 15), participants in the study completed a 15-km run competition. Blood samples were taken before and after competition. Oxidative stress markers, antioxidants, cortisol, IL-6 and IL-10 were determined in plasma or serum. IL-6 and IL-10 protein and mRNA levels were measured in blood mononuclear cells. Although higher plasma and blood mononuclear cell vitamin C levels were observed in the supplemented group when compared with the placebo one, the two groups showed identical exercise-induced changes in all the measured parameters. Exercise induced increased IL-6 and IL-10 levels in plasma and blood mononuclear cells. IL-6 and IL-10 mRNA levels in blood mononuclear cells increased after the competition. After recovery, IL-6 mRNA returned to basal levels and IL-10 mRNA levels remained elevated. In conclusion, exercise induced increased IL-6 and IL-10 production in blood mononuclear cells. However, vitamin C supplementation did not influence IL-6 and IL-10 response to exercise.     

南非国家高中数学课程与评价标准评介

2012年1月,南非颁布新的高中数学课程标准,较之与以往的南非课程标准相比,新的高中课程标准最为突出的变化体现在对学生评价的重视。在该课程标准中,除对课程颁布的背景、课程目标、课时分配、课程内容有详细介绍之外,还重点强调了对学生学习成就评价的标准。介绍南非高中数学课程标准及其特点,以期为中国高中数学课程改革提供借鉴。