论数学概念教学中的模糊性

数学概念中存在模糊,概念教学中的模糊是由概念自身的模糊、概念获得过程中的模糊以及人脑的机能所决定的必然现象;教学中应正视模糊性的客观存在,避免其消极作用.     

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.     

二恶英的污染来源及预防

二恶英是人们所知环境中毒性最大的有机化合物之一，它具有致癌性、致畸、内分泌毒性等。通过介绍二恶英的化学结构及污染来源，阐述二恶英的致毒机理及对人体健康的危害，展望了二恶英类物质分析研究和预防的新动向。     

网络化背景下我国政府公信力的重构与提升

一般而言,政府公信力主要由政府能力、传播载体和公众满意度三大要素构成,其中,大众传播媒介扮演着"宣传员"和"监督员"的双重角色.进入21世纪,以互联网为标志的大众传播的迅猛发展,使处于社会转型期的我国政府公信力建设面临严峻挑战.要破解政府公信力提升难题,必须从面临的挑战和自身系统构成出发,促进"三个转变",即政府从管制...     

立足校本促进教师专业化发展

社会的发展,呼唤优质的基础教育,要求建立专业化的教师队伍。实现教师的专业化,既需要教师本人的自我发展,也需要学校提供教师专业发展的平台,立足校本,促进教师的专业化发展。本文结合实际对促进教师专业化发展进行了系统论述,以此更好的推动中小学教师的专业化发展。     

柳宗元和马致远的愤郁与解脱

柳宗元与马致远虽处不同时代,但却有着相似点。二人都曾热切期望建功立业,却都由于种种原因在现实中碰壁,内心当然都会有理想难以实现之悲。怀才不遇都曾渴望在出世中寻求解脱,但二人的解脱结局却大不相同。文章主要从他们对愤懑的书写,对解脱的寻求及最终的不平与放旷三方面去解读。     

The Manipulation of Power Discourse on Religious Translation Both in the West and in China

As a cross-lingual, cross-cultural, cross-time-and-space communication, religious translation has inevitably been stamped, from the very beginning, with the brand of ideology and has, more or less, been restrained by political factors there and then. The translated version, very often, cannot truly mirror the essence of the source text mainly because translation is manipulated by the power discourse in the target culture.     

我国合同法定解除制度探讨

合同法定解除制度是合同法中的一项重要制度,其对合同双方当事人利益的保护、市场经济秩序的维护以及交易安全的保障均具有举足轻重的作用。我国《合同法》在借鉴其他国家或地区相关立法例的基础上对之作了规定,但仍存在一些不足。通过对合同法定解除的概念与特点,合同法定解除的原因、程序及其效力等方面详细的阐述,提出了自己的观点,对合同法定解除制度的进一步完善具有一定的借鉴意义。     

论加强大学生就业中的职业技能竞争力

近几年,就业难成为许多临近毕业的大学生面临的现实问题。通过分析当前大学生普遍缺乏的非认知技能,认为只有全面提高学生的职业技能,强化学生的技能竞争,把理论转化为实践经验,提高自身专业水平,大学生才有能力在严峻的就业难问题上把握机遇。     

论我国国有土地与集体土地的界分问题

我国现行法律对国有土地与集体土地的界分以地域为标准,特别是将城市土地绝对地规定为国家所有。这种界分标准是我国城乡二元结构的产物,也是由于立法者受时代的限制而未能对土地界分作出合理的制度安排的结果。"城市"是一个模糊的概念,以"城市"作为土地的界分标准势必会导致国有土地与集体土地边界的模糊。从权利发生的视角考虑,我们可以规定某一时点的城市土地归国家所有,并用权利证书的方式固定下来,使其成为权利变动的基础,但是我国土地总登记并不登记国有土地。从权利变动的视角考虑,这种界分标准在没有足够且正当充分理由的情况下给予国有土地所有权特别的保护,破坏了物权变动规则。其结果是加剧了国有土地与集体土地的不平等,地方政府借现行界分标准肆意征收集体土地,严重侵害农民权益,引发社会矛盾。在我国现行体制下,彻底打破国家所有与集体所有的各种制度设计都是不现实的。鉴于修改《宪法》、《物权法》之难于操作,比较可行的做法是,以土地总登记为基础,完善土地征收、司法救济等制度,弱化现行界分标准的负面效应,从而达到保护农民合法利益的目的。