OA期刊出版模式下的版权平衡——Zwolle原则及其应用分析

开放存取运动其实质是寻求学术交流领域的利益平衡.Zwolle原则是一个支持学术界进行积极有效的版权管理的一般性原则,对于OA期刊出版中的版权平衡具有积极的指导意义.借鉴Zwolle原则,应从权利配置、版权管理和利益协调三方面着手以实现OA期刊出版模式下的版权平衡.     

综合性大学开设公共选修课的现状和思考

高校公共选修课是拓展学生知识视野,提高学生综合素质的一个有效途径,也是教育部提倡的素质教育的一部分。针对目前各高校公共选修课开设情况及河北大学课程开设现状,文章将公选课开设过程中的问题集中进行了探讨,并提出了相应的对策。     

“DDMBAB”作PTC氧化甲苯合成苯甲酸

本文利用DDMBAB作为相转移催化剂运用在苯甲酸的合成中进行了实验探讨。寻找到了优化条件:(1)中性介质进行反应;(2)相转移催化剂与KMnO_4等摩尔比时可一次性定量萃取MnO_4-进入反应底物相中;(3)本实验条件下相转移催化剂用量nDDMBAB与底物甲苯n甲苯比为0.08,在反应中足以反复运载MnO_4-进行相转移;(4)KMnO_4的量与甲苯量比为n=2配原料;(5)反应2～2.5hr.。PTC氧化合成苯甲酸简便,产率70％。     

高温用捆带冷轧原料使用性能评价

某客户外购了一卷冷轧原料,尝试进行高温用捆带的试制,委托对其进行性能评估,以确认该原料钢卷能否满足实际生产的需要,为后续是否批量采购提供科学依据。通过对该冷轧原料进行化学成分、微观组织、力学性能、表面质量和板形进行分析,可以确认其尽管还存在一些不足,但总体上仍能满足使用要求。同时,建议客户在批量采购前最好对产品的捆扎方式、应用对象、生产工艺和性价比进行全面考虑。     

高职精品课程建设初探

精品课是课程中的精品.搞好精品课程建设是提高高职教育质量工作的重要内容.其要求在"精"不在"多",在"质"不在量;要组织好教学梯队,造就名师;要加强实践环节,凸显高职特点;要有科学的规划,贵在创新.     

“遥感图像解译”的实践教学探讨

我校“遥感图像解译”课程是面向电子信息类研究生的专业选修课.针对学生专业方向和应用背景,在分析“遥感图像解译”课程特点的基础上,从教学内容、实施形式、考核方式等方面提出加强该课程实践教学的方法和建议,以适应学科发展和人才培养的需求.     

工科教学创新研究——基于课堂教学和实践教学的视角

工科教学工作中存在的问题影响了工科学生培养的整体水平,为改变这一现状,必须改革创新工科教学方式,从课堂教学创新和实践教学创新两个角度出发,探索构建新的教学体系,以提高教学的实效性。     

地理信息系统专业中《测量学》课程的设置思考

结合GIS的专业特点及与测量学之间的关系,探讨了在师范类院校GIS专业中如何进行《测量学》课程的设置,从教材的选用、教学内容的取舍、实验实习教学环节等方面进行阐述,希望能起到一定的借鉴作用。     

活用8086/8088汇编语言指令

以 8 0 86/ 80 88汇编语言为例 ,通过两个程序的介绍 ,加以比较、分析 ,指出对汇编语言的理解与应用不能简单只留在指令的字面意义上 ,应清楚指令的实际执行的情况     

Investigation of iodine concentration in salt,water and soil along the coast of Zhejiang,China

Objective: We aim to describe the environment iodine concentration in salt, water and soil along Zhejiang Province coast in the China foreland. It will be helpful for us to judge whether this area is insufficient in iodine and universal iodized salt is necessary or not. Methods: We collected iodized salt samples, drinking water samples (tap water in the towns, and well water or spring water in the villages), water samples from different sources (ditches, lakes, rivers) and soil samples through random sampling in June, 2005. Salt, water and soil iodine was detected by arsenic-cerium redox method. Statistical analysis was expressed as mean±SEMby Windows SPSS 13.0. Results: (1) The iodine concentration in salt was 27.9±4.33 mg/kg (n=108). (2) Seventy-five water samples were collected. The water iodine value was 0.6～84.8 μg/L (mean of 11.66 μg/L). The watershed along the Qiantang River has significantly higher iodine content than the water in Lin'an in mountain area (P＜0.01). The iodine content and mean iodine content of tap water, well or spring water and natural water sources were 4.30±2.43 μg/L (n=34), 23.59±27.74 μg/L (n=19)and 12.72±10.72 μg/L (n=22) respectively. This indicated that among environmental water sources, the ditch iodine content was the highest with river water iodine being the lowest (P＜0.01). (3) Soil iodine value was 0.11～2.93 mg/kg (mean of 1.32 mg/kg).Though there was no statistical difference of soil iodine in different districts (P=0.131), soil iodine content correlated positively with water iodine content. Conclusion: Iodine concentration in salt accords with national policy of adding iodine in salt. Foreland has more iodine in water than mountain area. The data reflected that water and soil iodine in foreland area was not high, which suggests universal iodized salt should be necessary. Environment iodine has relatively close association with pollution.