原棉含杂率“标准棉样”的探讨

本文对原棉含杂率试验方法中获取杂质的科学性提出了异议、分析了原因、并阐明了解决的方法 ,指出了努力的方向     

谈谈随刊附盘的管理与利用

随着随刊附盘越来越多地进入图书馆，加大随刊附盘的管理力度显得越来越重要，本就附盘信息的科学录以及如何更科学有效地管理与利用提出了自己的看法。     

如何控制柱(墙)层间接头或模板接缝处蜂窝、麻面、露筋

随着我国建筑业的雄勃发展与科技水平的不断提高,用户对于砼强度指标、耐久性与工作性能的要求随之增加,同时对砼结构的外观要平如镜面,特别更需要突出清水砼结构要求,为此建议提出一个新的课题给我们的施工作业:如何控制柱(墙)层间接头或模板接缝处蜂窝、麻面、露筋等现象。     

营养速递

喝果汁≠吃水果 有的孩子不喜欢吃水果,家长就把水果榨成果汁给孩子喝,这种方法不可取,因为果汁中含的纤维素比水果少得多,如果膳食纤维摄入量不足,必然造成粪便量太少,从而导致便秘。     

参数问题的解题对策

参数问题是中学数学的一个重要内容，它渗透于每个章节，也是高考的一个热点问题．参数问题包含两个方面：含参数问题的求解；巧设参数解决问题．如何处理参数寻求对策，本文试就这个问题谈一些看法，概括起来就是：回避、选择，寻求。     

5-氨基四唑及其衍生物的合成和应用综述

文章综述了5-氨基四唑及其4种衍生物高氯酸.四氨.双(5-硝基四唑)合钴(Ⅲ)(BNCP)、3,6-双(l-氢-l,2,3,4-四唑-5-氨基)-l,2,4,5-四嗪(BTATz)、5-氨基四唑的Schiff碱、α-(5-四唑基)氨基烃基膦酸酯的合成、性质与应用.     

一类含参广义变分不等式组的灵敏性分析

本文应用新的方法研究了一类含参广义变分不等式组解的灵敏性 ,得到了一些新的结果 .     

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.     

退出“尖子班”,适合的才最好

一儿子6岁那年,成为班上年龄偏小的三个孩子之一。入学后,他还不会写阿拉伯数字1到10,把9的"豆芽头"歪在了另一边,把10写成"01";我让他数教室后窗栅栏里的一溜花盆,他硬是数不到15;做作业时,他的小手软软地握着铅笔,拼音字母写得比他自己还幼稚。在整个小学阶段,我与先生始终顶着巨大的压力,除了给儿子修了一门软笔书法,没有逼他参加其他辅导班。