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William F. Cox 《Contemporary educational psychology》1978,3(1):95-101
Two groups of undergraduates were required to verbally reorder previously memorized pairs of nouns to detect the underlying structural relationship or chain among certain memorized pairs. While the types of word chains were always structurally identical for the two groups, the groups differed as to whether the list of word pairs were concrete or abstract nouns. Subjects who received concrete words both memorized the pairs and solved the problems in less time than did subjects who received abstract word pairs. Superior performance was supposedly due to the differential effect of imaginai versus verbal encoding. Implications were discussed regarding both educational and psychological issues. 相似文献
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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。 相似文献
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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。 相似文献
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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. 相似文献
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《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。 相似文献
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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. 相似文献
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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。 相似文献
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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. 相似文献
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