10个桉树无性系抗寒锻炼特性的研究

采用人工低温处理结合电导法,测定了10个桉树无性系在未锻炼、锻炼与脱锻炼等不同处理下冻害胁迫抗性的半致死温度。研究结果表明,大部分的无性系在6℃10d＋3℃10d的锻炼处理后,比对照株的冻害胁迫抗性增强,剔除实验期间苗龄变化的影响后半致死温度平均降低6℃。脱锻炼后,抗寒锻炼获得的抗冻性消失,大部分降到比对照株更低的抗冻性水平。桉树无性系的抗冻性受抗寒锻炼的影响,抗寒锻炼能提高桉树无性系的抗冻性。根据锻炼后的maxΔLT50与锻炼前的CK0对桉树不同无性系的抗冻性,将10个无性系划分为4种类型即冷抗可锻炼型（RA）、冷抗不可锻炼型（RUA）、冷敏可锻炼型（SA）、冷敏不可锻炼型（SUA）,其中XL2和XL6为冷抗可锻炼无性系,XL4属冷抗不可锻炼无性系,XL7属冷敏不可锻炼的无性系;其它6个无性系为冷敏可锻炼无性系。     

A Difference We Can Call Our Own

The article contends that communication scholars' most influential work is often not identifiably “communication” research. This phenomenon is a result of: (a) theory, which emphasizes message effects rather than message content, and (b) method, which has failed to provide valid, detailed, and shared methods for the quantitative examination of message content. It is suggested that a stronger focus on message content is required if communication is to maintain a disciplinary identity and a unique disciplinary contribution.     

改革女生铅球教法程序的探讨

本文通过对部分大、中学女生铅球（包括实心球）测试成绩的抽样调查，进行比较分析和小范围的教学试验，提出发展力量素质与铅球动作技术结构相结合的教法程序，以代替传统教法程序，达到事半功倍的教学效果。     

Library of Congress Subject Headings

No abstract available for this article.     

Motivations for Library Use: Dover,Delaware, Library User Identity‐Motivation Pilot Study,December 2005

Under State Librarian Annie Norman, the Delaware Division of Libraries (DDL) has made notable progress in planning, measuring and advocating for programs and funds that have improved the libraries of that state. A visit to the state library's homepage (http://state.lib.de.us) immediately demonstrates the DDLS sense of purpose in the tagline motto, Delaware Libraries: Infrastructure + Capacity = Sustainability. DDL planning is ongoing, including a 2008 plan to move all the state's libraries forward in the critical areas of economic development, lifelong learning and health information. One document in this planning process was the 2005 pilot study to examine and categorize the motivations for why individuals use the public library. It is that study, a market segmentation study of the reasons why people use the library, that is published here. The study that is the basis for this report was produced under contract by the Institute for Learning Innovation (http://www.ilinet.org/display/ILI/Home). DDL would like to give a special thank you to Dr. John Falk of the Institute for Learning Innovation for his significant help with this study. Presented here in its entirety, the study report can be found on the Delaware Division of Library Services Web site at http://state.lib.de.us/For_libraries/planning/Dover%20Library%20Pilot%20Study%20Final%20Report1.pdf. The editors gratefully acknowledge the willingness of Delaware State Librarian Annie Norman and the Delaware Division of Libraries for the right to reprint this significant methodological example for PLQ readers.

The study is based on two surveys: the first a “user interception survey” of 113 pre and post interviews collected at the Dover Public Library across 20 hours through one week in November of 2005. The second part of the study involved follow‐up telephone interviews with over 25 percent of those who had participated in the first study.     

作文网上评分“三评法”初探

文章针对目前网阅环境下作文"一评"定分评分方法的缺陷,提出了将"三评法"应用于作文评分中。结果表明,"一评法"下,评分员间一致性不够理想,存在显著性差异。"三评法"在一定程度上降低了评分误差,确保了阅卷质量。但这种方法在实施过程中也要注意避免三评人员的求稳心理,以确保该方法得到科学合理的使用。对于该方法能否投入到大规模作文网上评分中,还有待进一步研究。     

讨论式教学法在士官大专《工程力学》课例中合理运用

讨论式教学法能够充分调动学员的学习热情,培养创新思维和多种能力,是一种实用性很强的教学方法,本文针对讨论式教学法在士官大专《工程力学》课程中的试点,结合用微积分关系法绘制剪力图和弯矩图的典型课例,详细论证了讨论式教学法的不同形式在该课例中的灵活运用,不但活跃了课堂气氛,而且取得了良好的教学效果。     

“校企共同体”下高职院校师资队伍建设的实践与探索

“校企共同体”是校企合作的新型组织形式。“校企共同体”下高职院校师资队伍建设应积极吸收企业优秀人才,强化对教师的培养培训,建立专兼职教师一体化的管理机制和“共建、共享、共融”的校企合作机制,充分利用技术研发中心平台形成“三能”教师团队,改善职称评审导向的政策引领机制,营造良好的教师职业成长环境。     

Editorial

The aims of this study were to assess the validity and reliability of body volume and percent body fat determined by sulphur hexafluoride dilution, using underwater weighing as the criterion method, and to determine the influence of the magnitude of body volume. Thirty-one healthy Japanese individuals aged 18-27 years (16 males: height 1.70 - 0.06 m, mass 64.8 - 7.7 kg; 15 females: height 1.60 - 0.05 m, mass 55.2 - 6.2 kg; mean - s) participated in the study. Sulphur hexafluoride dilution measures the concentration of sulphur hexafluoride gas in the chamber (BSF-200, Shimazu Corp.). Underwater weighing was performed five times using a weight scale (AD-6204, A&;D) after residual volume had been determined (System9, Minato Medical Corp.). There were no significant differences in the mean between two trials for body volume, body density or percent body fat determined by sulphur hexafluoride dilution. The intra-class correlation coefficient of these variables ranged from 0.985 to 0.999. The results suggest that sulphur hexafluoride dilution is a reliable method for assessing body composition. There was no significant difference in body volume or percent body fat between sulphur hexafluoride dilution (males: 61.3 - 7.6 litres, 18.4 - 6.7%; females: 52.8 - 6.9 litres, 21.0 - 8.9%) and underwater weighing (males: 60.6 - 7.0 litres, 15.6 - 3.5%; females: 53.0 - 6.5 litres, 23.7 - 6.1%) and there was a high correlation between the two ( r = 0.997, P ? 0.05). A Bland-Altman plot of the difference between percent body fat estimated by underwater weighing and sulphur hexafluoride dilution versus average percent body fat by the two methods showed no systematic difference (mean difference =- 0.12 - 6.6 kg). The upper and lower limits of agreement were 13.2% and-13.4%, respectively. Determination by sulphur hexafluoride dilution resulted in both over- and underestimations in body volume and the difference between the two body volumes (determined by underwater weighing and by sulphur hexafluoride dilution) was inversely proportional to the mean body volume by the two methods. This suggests that improvements need to be made to the device or to the technique to maintain a constant volume of sulphur hexafluoride in the chamber.