Morphological proportionality in elite age group North American divers.

The purpose of this investigation was to describe the morphological parameters that characterize elite age group divers. Comparisons are made to normative age group data from the Coquitlam Growth Study and the constancy of important characteristics from age group to age group is examined. Data were collected on 27 male and 28 female elite divers who participated in the 1990 North American Age Group Diving Championships. Body build, body composition and skinfold corrected diameters were determined from 36 anthropometric parameters and analysed by ANOVA, t-test and Phantom z-scores procedures. All age groups except the 14- to 15-year-old males were significantly (P < or = 0.05) shorter than their norms but recorded higher androgyny index values. The estimated relative muscle mass increased significantly (P < or = 0.05) with age for males at all ages (40.8-46.3%). The 16- to 18-year-old females had a significantly (P < or = 0.05) larger relative muscle component compared to the younger age groups (40.1-38.4%). When normalized for height, active tissue development of the extremities was comparable between the sexes except in the forearm. The results indicate that at all age levels short stature is an important characteristic for divers. Analysis of regional active tissue development provides further insight into sport-specific prerequisites for success at elite levels.     

18#工字钢轧制缺陷的成因及改进

型钢厂中型车间轧制18#工字钢,常发生腿窄、耳子问题,这是由于孔型设计不够完善,使金属在压缩中的不均匀变形程度加剧所致。通过孔型优化较好的解决上述问题。     

数学教学中如何加强学法指导

针对数学教学中如何加强学生学习方法指导提出了看法和意见并应用于具体的实践中,促使学习从“学会”数学到“会学”数学的转变,有效地提高了教学质量,最终使学生取得良好的成绩,对其它学科的学法指导也有一定指导意义。     

建立创新体系实现战略重组

钢铁研究总院是一个综合性科研开发机构,经过40多年的发展,积累了雄厚的实力.全院一直密切关注钢铁工业的发展,并较早开始了技术创新方面的研究与实践,同时大力开展与技术创新相配套的制度创新,努力建立创新体系,发展高科技产业,取得了一定成绩.     

亚洲玉米螟幼虫转移规律及防治适期研究

通过对亚洲玉米螟幼虫转移规律及防治适期的研究,明确了在心叶末期前９０％的幼虫集中在雄穗中,抽穗后才分散转移,大多数幼虫分散到中部和穗部,占总虫数的６０％左右．经不同时期防治试验表明,在春、夏、秋玉米连续种植,玉米螟为害严重的地区,在心叶末期防治的基础上,在吐丝期再防治一次,才能有效地减少虫量,提高产量     

Associations Between Sexting Behaviors and Sexual Behaviors Among Mobile Phone‐Owning Teens in Los Angeles

The implications of teen sexting for healthy development continue to concern parents, academics, and the general public. Using a probability sample of high school students (N = 1,208) aged 12–18, the prevalence of sexting, associations with sexting, and associations between sexing and sexual activity were assessed. Seventeen percent both sent and received sexts, and 24% only received sexts. Sending and receiving sexts were positively associated with each other and both behaviors were associated with having peers who sext. Lifetime reports of sexual intercourse, anal sex, oral sex, and recent unprotected sex were positively associated with reports of texting 300 or more times per day, only receiving sexts, and both sending and receiving sexts.     

On the Need for Dionysian Education in Schools Today

Although much has been written about Friedrich Nietzsche's views on education over the years, and much has also been written about Dionysus, god of wine and ecstasy, very little attention has been given to the meaning of, and need for, Dionysian education. In this article, Sean Steel attempts to begin that project. Drawing Nietzsche's articulation of the Dionysian, Apollonian, and anti‐Dionysian into the orbit of broader scholarship on Dionysus, Steel invites readers to think about what a Dionysian education might look like in a modern‐day school setting, as well as to consider what challenges exist for the implementation of such a vision of education.     

THE ‘RADICAL’ NARRATIVE,POLITICAL THOUGHT AND PRAXIS

This article offers a methodological refinement to the radical narrative of media history and advocates an exploration of the ideological dynamics of media texts as a crucial component of their praxis. Focusing on early to mid nineteenth-century utilitarian theory and praxis as exemplified in newspapers and pamphlets such as the Westminster Review, the Examiner and Pamphlets for the People, the article offers a sophisticated ideological critique which is intended to augment radical analyses of media history. This analysis allows a more focused and precise account of the ways in which early proto-liberal reformers used the press in their political strategy. Despite the Philosophic Radicals Mill, John S. 1873. Autobiography, London: Longmans, Green and Dyer.  [Google Scholar] having democratic aspirations, the article identifies inherent paternalistic and oppressive components of this praxis which has their seeds in classical Greek political thought.