Fe2O3 as indicator of heavy metal enrichment in Zhujiang(Pearl River) estuary sediments

A part of the heavy metals in estuary and coastal zone occurs naturally in the environment; the other part is due to human activity; so the directly measured concentration of heavy metal does not automatically indicate anthropogenic enrichment. Fe2O3 was used in this study as conservative tracer to distinguish natural components from anthropogenic components of heavy metal sediment concentration in the Zhujiang estuary. Compared with clay and Al2O3, Fe2O3 is more suitable as reference element. The final results showed that two zones in the Zhujiang estuary were seriously contaminated by heavy metals. One nearby the Humen mouth; the other around the west coast of the estuary. The horizontal distribution of heavy metals indicates that Zn, Ni and Cu have wider contaminating areas than TiO2, V and Cr in the estuary.     

谷氨酸修饰玻碳电极的制备及性质研究

研究了谷氨酸在玻碳电极表面上电化学聚合的条件及修饰电极的电化学特性,发现在0.0V-1.9V范围内,以10mV的扫描速度循环扫描10圈制备Glu/GCE电极效果最好,并且Glu/GCE电极在强酸性环境中对Fe(CN)63-探针离子的阻滞行为较弱.     

化学反应速度及活化能测定实验研究

针对化学反应速度及活化能测定实验中经常遇到的困难,分析了实验失败的主要原因,是由于固体(NH4)2S2O8试剂中含有少量水而引起的,提出了用Na2SO3及以痕量碘加速过量Na2SO3氧化的方法消除其影响.     

International collaborations in learning and teaching: perspectives from a visiting professorship

This article provides a reflection on the outcomes of an international collaboration between health librarians and academics at York St John University and Pacific University Oregon. In particular, it describes how a month‐long visiting professorship from an academic with a clinical librarian background at the Faculty of Health and Life Sciences helped to develop and inform teaching practice in the areas of information literacy and evidence‐based health practice on health programmes at Pacific University. Perspectives are offered from both institutions on the rich exchange of knowledge and practice that took place during the visit and the ongoing impact it has had on teaching practices. H. S.     

高校实验仪器管理中TPM模式的应用

本文介绍了TPM模式,分析了高校实验仪器管理现状,并阐述了TPM模式在高校实验仪器管理中的应用与实践.     

20世纪中国美学的集体情结

美学家的“美学情结”有个体和集体之分。强调美学的人生性和追求心灵的审美性，成为20世纪中国美学的集体情结，并由此形成了美学的两大特点：审美主义和功利主义的内在统一，艺境求索和艺术心培育的互为呼应。20世纪中国美学的集体情结实质上又是美学本土性问题的体现。     

我国高等师范院校体育教学改革值得探讨的热点问题

本文采用问卷调查法和文献资料法等多种研究方法,对当前我国高等师范院校体育教学改革的现状及存在的问题进行探讨。阐述了我国高等师范院校体育值得关注的教学改革与健康第一、创新教育、终身体育、素质教育、全民健身等几个热点问题。     

关于(QU)型模糊拓扑环的直积

本文定义了模糊拓扑环的直积，论证了该定义的合理性；证明了(Qu)型模糊拓扑环的直积仍是(QU)型模糊拓扑环；并研究了(QU)型模糊拓扑环直积的性质。     

Mo(Ⅵ)-DBPF-PVA分光光度法测定尿蛋白

提出了一个借钼(VI)-4,5-二溴苯基荧光酮(DBPF)-聚乙烯醇(PVA)与蛋白质显色反应光度法测定微量尿蛋白的分析方法.在pH=2.0,牛血清蛋白能与Mo(VI)-DBPF- PVA形成紫红色络合物,最大吸收波长为570nm,牛血清蛋白含量0-5μg/mL范围内服从Beer定律.尿液中其它成份不干扰测定.用拟定的方法测定人尿蛋白,获得满意结果.