二氧化硫脲/Ca（OH）2-铁氧体法处理铜铬电镀废水工艺

当二氧化硫脲用量是还原Cu^2＋为Cu与还原Cr^5＋为Cr^3＋理论值总和的两倍时,使用二氧化硫脲在石灰饱和溶液（pH≈12．8）、沸腾条件下处理铜铬电镀废水,废水中Cu^2＋从31mg／L降为0．4mg／L,Cr^5＋从23mg／L降为0．017mg／L,总铬量由35mg／L降为5．3mg／L,经分析沉淀物为Cu（黑色）、Cu2O、Cr（OH）3趁热过滤后,往滤液中加入FeSO4·7H2O,调节pH至中性,鼓入空气,冷却至得到黑色铁氧体沉淀．经处理后残铜量为0．2mg／L,总铬量为0．035mg／L,PO4^3-由5mg／L降为1mg／L．各项指标优于工业排放标准．     

利用高钠Al（OH）3原料降温煅烧制备α-Al2O3粉体的研究

以含钠质量百分比高达2.5%～3%的Al(OH)3为原料,通过添加除钠剂进行除钠,并结合氢氧化铝的差热-热重曲线,根据氧化铝相变机理来确定合理的烧结制度,同时研究了α-Al2O3晶种以及降温催化剂在氢氧化铝烧结过程中促进氧化铝相变、降低α-Al2O3的相变温度的幅度及其机理。     

关于Fe（OH）3胶体制备实验中一个问题的探讨

本文主要讨论在胶体制备实验中关于电场强度的计算问题。建议用公式 E＝ j/κ代替公式 E＝U/L计算电场强度,避免了两电极之间的曲线距离的测量,可以减小误差的产生。     

溶胶纯化火棉胶配方的探讨

采用DDS-320精密电导率仪,以测定溶胶电导率值为基础,探讨了硝化纤维、乙二醇及混合有机溶剂用量对渗析后溶胶电导率值的影响,得出适合实验室操作的火棉胶配方:混合有机溶剂50mL,乙二醇0.2~0.3mL,硝化纤维3.000 0g。实验结果表明,此火棉胶配方能较好地解决传统实验中火棉胶制半透膜需要多次涂层、单层膜薄易破、纯化溶胶耗时长、实验成功率低等问题。     

Performance of good and poor readers at two grade levels on an Auditory Cognitive Style Task

Sixty-four good and poor readers at first and third grades were administered a task measuring cognitive style in the auditory modality. They were also administered the Peabody Picture Vocabulary Test-Revised (PPVT-R) to obtain a measure of IQ. Poor readers committed significantly more errors and exhibited shorter response latencies on the Auditory Cognitive Style Task than did good readers. More importantly, poor readers demonstrated inefficient strategies for successful performance. It was suggested that good reading skills, as well as successful performance on the auditory task, require a certain degree of planfulness and self-monitoring activity on the part of the child which was apparently absent in the poor reader. Furthermore, it was proposed that the cognitive style variable, conceptual tempo, may be better viewed within the framework of the concept of metacognition.     

Fe（OH）3溶胶电泳实验的改进

《物理化学实验》中溶胶电泳实验,从溶胶制备、渗析纯化到电泳,存在时间长、制备和渗析纯化容易失败等问题。本文提出了一种快速简便的溶胶制备及＂抽滤渗析加尿素＂的纯化方法。实验结果表明,此法具有省时、简便,成功率高等优点。     

Test mode anticipation and performance: A classroom experiment

The study investigated the effect of test mode anticipation on performance in the anticipated and the unanticipated mode in four sections (same instructor) of a first-year college algebra course. To build up anticipation, students in two sections received recall tests, and students in the other two sections received recognition tests over 6 successive weeks. Following this, the test mode was changed without warning for half the students in each section. Results showed that performance suffered when the test mode was changed for students anticipating a recognition test. Students anticipating a recall test did equally well in both test modes.     

内源性一氧化碳的产生及其生理功能

一氧化碳（CO）是与一氧化氮（NO）相似的信使分子,在人体内广泛存在。它可以通过酶解血红素氧合酶（HO）而在多种细胞产生，是一种鸟苷酸环化酶（sGC)的激活剂。近来研究表明，CO对呼吸系统，心血管系统、神经系统等均发挥调节作用。     

N-叔丁氧羰基-N^im-三苯甲基-D-型组氨酸的合成

报道了D型组氨酸先与三苯甲基氯反应得到D—His（Trt）-OH，进一步在碱性条件下与叔丁氧碳酸酐反应，得到N-叔丁氧羰基-N^im-三苯甲基-D-型组氨酸，结构经MS，^1H—NMR,^13C—NMR，UV，IR确证．