共沉淀法制备磁性液体的粒度和纯度控制

提出化学共沉淀法制备Fe3O4磁性液体的工艺流程包括溶液配制、化学反应和包覆分散三个阶段，其技术关键是控制Fe3O4磁性微粒的纯度、粒度和分散性。从理论和实验的角度，详细分析了在各阶段各种工艺参数对磁性颗粒纯度控制和粒度控制的影响原理、影响程度和影响规律。说明各阶段不同工艺参数的合理匹配，是能够成功地制备出品质优良的磁性液体的关键。     

阴离子型封闭聚氨酯聚电解质的制备

以甲苯二异氰酸酯、聚酯多元醇、扩链剂、封闭剂，通过丁酮法合成了阴离子水性聚氨酯电泳涂料。实验结果表明，NCO基团含量越高，漆膜硬度越高；亲水性扩链剂用量越多，乳液粒径越小，粘度越大，耐水性越差；当三乙胺的中和程度为0．75时，漆膜的综合性能最优。本实验用丁酮肟作为封端剂，漆膜性能得到很大的改善。     

Adapting Curriculum to Student Diversity: Patterns of Perceptions Among Alternate-Route and College-Based Teachers

This study examined the perceptions of alternate-route and college-prepared teachers about the adaptation of mathematics and writing curriculum to student diversity. Findings from analyses of survey and interview data suggest that while at any given time a majority of teachers from both groups favored curriculum adaptation in mathematics and writing, commitment to these beliefs among individual teachers was inconsistent over time, with a pattern of deflected responsibility emerging. With the exception of two specific teachers, when discussing the value of adapting writing curriculum to students' cultural values, neither group of teachers went much beyond a general rhetorical discussion. With regard to mathematics, both groups of teachers only infrequently discussed the value of adapting mathematics to students' cultural values.     

二氧化氯的制备与应用

本文综述了二氧化氯的制备方法和应用。二氧化氯的制备方法主要有化学法和电化学法两种。二氧化氯在纸浆漂白、医疗卫生,环境保护、食品工业和水处理等方面具有广泛的应用     

Linking Science Education to the Workplace

This article examines the issue of linking education in the sciences with the world of work for all students. Traditionally, science teaching has been limited to preparing student for research career in science at the university level. The reform movement in science education is focused on intellectual skills that serve to fortify the human capital of all students and the economic productivity of the nation. The educational issue arises from evolutionary changes that are taking place in the practice of science, the development of a global economy, the nation's entrance into an Information Age, and the changing nature of the workplace. To identify and integrate these factors in the practice of science teaching is the goal of this article.     

氮化钾基材料的合成研究进展

氮化镓，是直接带隙半导体材料，在室温下有很宽的带隙（3.39eV）。它在光电子器件如蓝光、紫外、紫光等光发射二极管和激光二极管方面有着重要的应用。本文系统地介绍了氮化镓的各种制备方法，对其结构和性能关系的研究,揭示了它在半导体领域广泛且重要的应用前景。     

Using possible-selves theory to understand the identity development of new teachers

Questions about identity and future success often occupy the thinking of individuals during life transitions. Possible-selves theory describes how future-oriented thought provides identity-relevant information and motivation to pursue self-relevant goals. Expected and feared possible selves of beginning teachers (n = 221) were analyzed revealing four main categories (i.e., interpersonal relationships, classroom management, instruction, and professionalism). Differences between student and beginning inservice teachers suggest a transitional trajectory that could have implications for understanding the “how” of teacher identity development. Possible-selves theory may help bring a degree of unity across divergent frameworks and help link identity to broader issues of teacher development.     

超声波辅助提取绿茶紫外线吸收剂工艺优化研究

为优化超声波辅助提取绿茶中紫外吸收剂的工艺参数,探讨提取时间、提取温度、料液比、乙醇浓度和提取次数对提取液吸光度的影响,采用RSA响应曲面法优化超声波提取时间、提取温度和料液比.结果表明,超声波辅助提取绿茶中紫外吸收剂的最佳工艺条件是：以60%的乙醇提取次1次,超声温度50℃,超声时间为50min,料液比为40 mL/g,紫外吸收剂的最大吸光度值为0.597.     

La掺杂Co-Fe-O纳米磁性材料的制备和表征

以Fe(NO3)3·9H2O,Co(NO3)2·6H2O和La2O3为原料,首先制备出晶粒细小的盐渍化碱式碳酸盐前驱体,在400℃、500℃、600℃、700℃、800℃分别烧结1h,制备出CoFe2O4和LaCo0.4Fe0.6O3纳米磁性材料,并用XRD、SEM和IR对样品进行表征,研究了不同的烧结温度和La掺杂对物相的形成及颗粒大小的影响.     

无机高分子混凝剂聚硅硫酸盐的制备

无机高分子絮凝剂是城市用水和工业废水处理的有效药剂。在研究聚合硫酸铁(PFS)合成工艺的基础上,设计出一套合成无机高分子混凝剂聚硅硫酸铁(PSPFS)和聚硅硫酸铝铁(PSAFS)的方法。采用正交试验法,通过模拟浊水的混凝试验,确定Fe/Si摩尔比、Na2SiO3.9H2O溶液聚合时间、反应时间、反应温度和Al/Si摩尔比等最佳参数。