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.     

网络三维虚拟实验系统的设计与实现

根据虚拟现实技术特性,结合代表性的案例,分析网络三维虚拟实验系统的基本构成框架。依据虚拟实验系统的开发流程,以化学虚拟实验《实验室制取气体》的开发为例,介绍了基于Virtools开发网络三维虚拟实验系统的方法和过程。最后,对网络三维虚拟实验系统的开发应用进行了总结与展望。     

略论民主革命时期毛泽东反腐倡廉的思想及其意义

民主革命时期毛泽东反腐倡廉的思想主要包括:关于反腐倡廉的重要性、关于反腐倡廉的主要内容等,论述了毛泽东反腐倡廉思想的历史意义和对现实的启迪意义。     

Fuzzy Comprehensive Assessment Method to Determine Tectonic Stress Patterns

The tectonic stress patterns were determined by a fuzzy comprehensive assessment method. Data of in-situ survey and fault information were utilized in the method. First, by making pressure and tension in the directions of along-river, cross-river, shear clockwise, and shear counterclockwise , 26 types of tectonic stress patterns were presented. And the stress vector of each pattern was obtained with FE software by taking unit displacement as boundary load. Then, by taking the 26 types of tectonic stress patterns as index set and 3 main stresses as factor set and choosing various operators, comparison of directions of computational stress vector and survey stress vector was made and the most possible tectonic stress pattern was obtained. Taking the 26 types of tectonic stress patterns as index set and strike angle as factor set, comparison of relationships between formation of fault and tectonic stress was made,and the tectonic stress patterns were assessed with known fault information. By summarizing the above assessment results, the most impossible tectonic stress pattern was obtained . Finally an engineering case was quoted to validate that the method is more feasible and reliable than traditional empirical method.     

学生突发事件应急处理探讨

构建学生突发事件应急处理预案是有效预防、及时控制和消除学生突发事件的危害，保障在校学生身心健康和生命安全，维护正常的校园秩序，营造良好育人环境的有效方法，也是新时期学生工作的重点。本文从对学生突发事件应急处理预案的认识，对学生突发事件的管理原则、预警机制、处理办法做了探索，力求为预防和高效处理学生突发应急事件提供参考。     

谈如何做好高校学生干部的培养工作

做好学生干部培养是高校学生管理工作中非常重要的一个环节 ,本文结合作者实际工作中的一些经验 ,重点介绍了如何做好学生干部培养工作     

"科学"观与教学模式关系的探讨

“科学”现的发展与教学模式的变革之闻存在必然的联系,新的“科学”现与现代教学模式是相符合的,是互为依据的。     

高校学生利用图书馆的调查分析

通过对遵义师范学院在校大学生到图书馆借阅文献的次数、阅读场所及时间、利用目录的情况等方面所进行的一次书面调查,探讨了高校学生的阅读规律、阅读效率,并提出了改进工作的若干措施。     

图书馆服务传递系统的作用及类型分析

从服务营销学的角度，探讨图书馆服务传递系统对图书馆质量管理的重要作用。并依照营销学分类标准对图书馆服务传递系统进行了类型分析。     

任凤苞及《天春园方志目》稿本述论

文章以河北大学图书馆藏《天春园方志目》四种稿本为研究对象,全面介绍了《天春园方志目》四种稿本的版本年代、版式、内容、校改方式、校改特点以及各种稿本之间的联系和变化,并将其与传世刻本进行对比,分析该稿本具有的文物价值、文献价值和版本价值。