渡江路线的数学模型讨论

针对2003年的全国大学生数学建模竞赛中的渡江问题进行了讨论分析，建立了渡江问题的通用模型，通过对游渡角度的讨论，给出了游渡成功的基本条件和最佳游渡路线。     

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.     

From the Editor

Educational Assessment, Evaluation and Accountability -     

纸质档案绿色抑菌剂的筛选及应用研究

微生物防治是纸质档案保护的重要内容,但防治过程中对环境的污染和人体的危害一直困扰着档案保护工作者。本文选择绿色无危害抑菌剂对纸质档案进行实验,首先通过抑菌活性筛选出抑菌剂,其中接触型抑菌剂抑菌效果匹马霉素>PHMB>ε-PL>蒜氨酸,空间型抑菌剂抑菌效果香芹酚>香茅醛>2-苯乙醇;其次进行了联合抑菌实验,确定了PHMB（125mg/L）与匹马霉素（3.906mg/L）配伍的接触型抑菌剂、香芹酚（15.62mg/L）与香茅醛（31.25mg/L）配伍的空间型抑菌剂性能最好;最后对上述两组抑菌剂处理过的纸张进行安全性能检测,结果显示两种抑菌剂组合对纸张拉力无显著影响,但有显著的脱酸和抗老化效果,对处理后的纸张ΔE最大值不超过1.5。本研究为研制安全高效的纸质档案抑菌剂提供实践基础。     

Preparation for ethical decision-making: An analysis of research in professional education

The current societal and professional context presents a variety of ethical challenges to decision makers. The importance of educational preparation for ethical decision-making and ethical leadership has been addressed in the literature of library and information science (LIS), among other professions. However, it can be quite difficult to measure the impact of professional ethics education on students. This article is based on an evaluation of published original research related to ethics education in disciplines supported by professional education, including education, nursing, allied health, journalism, social work, public health, engineering, and LIS. The study considers data related to research design, methodologies used, populations studied, approaches to measuring impact, levels of impact, and publication in the journal literature. Results indicate more extensive research in education and nursing as compared with other fields, a lack of baseline data gathering for comparison, a reliance on a limited number of data-gathering techniques, and a tendency toward studying alumni over current students     

县级图书馆开展"以文补文"活动反思

本文回顾了县级图书馆开展"以文补文"创收活动的前因后果,比较了开展创收前后的县级馆事业发展状况,分析了盲目开发造成主副业本末倒置的不良后果,指出坚持公益性原则有利于图书馆事业的发展.