共查询到20条相似文献，搜索用时 125 毫秒
1.
采用原位一步合成法合成3，5-二硝基水杨酸插层水滑石材料，用XRD、IR对合成的样品进行表征，并与水溶液中阴离子直接交换合成法进行比较。结果表明，采用上述两种方法在控制适当的反应条件下均能制备出相应的3，5-二硝基水杨酸插层水滑石，但相比之下，原位一步合成法明显具有合成时间短，步骤简单和节约能耗等优点。 相似文献
2.
3.
异氰酸酯合成方法的研析 总被引：2，自引：0，他引：2
沈志涌 《通化师范学院学报》2004,25(4):57-59
异氰酸酯是一种重要的有机合成材料，它的合成方法主要有光气法，碳酸二甲酯法，硝基苯羰化等；每种方法各自有其优点和缺点，但无污染，高产率的合成方法，越来越受到人们的重视． 相似文献
4.
马淮凌 《商丘师范学院学报》2002,18(5):81-82
研究了1－羟基1，1－二磷酸乙烷的合成及其钠盐的制备，合成方法为一步合成法，该方法采用三氯化磷和醋酸为起始原料，操作简单、快速，产率为理论值的90％。 相似文献
5.
PU／PMMA互穿聚合物阻尼涂料的研究 总被引：2，自引：0，他引：2
利用互穿聚合物网络和二步合成法，合成聚氨酯／聚丙烯酸酯，同时加入一定量添料，制成涂料，研究结果表明，该涂料具有较好的阻尼性能和很好的工业开发前景。 相似文献
6.
由丁二酸酐和二乙基三胺为起始原料采用熔融缩聚法合成出了端氨基超支化聚酰胺；确定了适宜的合成路线和合成反应条件，用FTIR，1H-NMR和GPC对超支化聚酰胺进行了表征。 相似文献
7.
董芳菊 《南宁师范高等专科学校学报》2013,(3)
从语境法和结构法简述英语阅读教学中猜测生词词义的几种策略，以语境法中的根据定义，逻辑关系和根据上下文和生活常识和结构法中的派生法，合成法和转化法猜测词义为例，进行猜词策略的培养。 相似文献
8.
任清 《宁夏师范学院学报》2001,22(3):39-41
以氯乙酸和苯酚为主要原料，采用Williamson法合成具有杀菌作用和植物生长调节作用的苯氧乙酸，以它为中间产品，加入氯制剂，合成防落素的主要成份对氯苯氧乙酸和植物生长调节剂2．4－二氯苯氧乙酸，并对影响合成产率因素进行了初步探讨。 相似文献
9.
10.
碳纳米管的研究进展及应用 总被引：1，自引：0，他引：1
阐述了碳纳米管的结构，并对碳纳米管合成方法及其应用进行了简单的分析，同时指出了碳纳米管的研究进展。其合成方法主要有电弧法、激光蒸发法、催化剂气相分解法。其应用领域主要在力学、催化剂及储能方面。 相似文献
11.
The syntheses and characterization of six new spin labeled phenoxyacetates as potential auxins are discribed. 相似文献
12.
ＩＮＴＲＯＤＵＣＴＩＯＮＳｔａｂｌｅｎｉｔｒｏｘｙｌｓｈａｖｅｂｅｅｎｕｓｅｄｅｘｔｅｎｓｉｖｅｌｙａｓｓｐｉｎｌａｂｅｌｓｉｎｖａｒｉｏｕｓｂｉｏｌｏｇｉｃａｌｓｙｓｔｅｍｓ(Ｓａｎｋａｒａｐａｎｄｉｅｔａｌ.,1994;Ｋｏｃｈｅｒｇｉｎｓｋｙｅｔａｌ.,1995)ａｎｄｄｒｕｇｓ.Ｓｏｍｅｎｉｔｒｏｘｙｌｓｗｅｒｅｄｅｍｏｎｓｔｒａｔｅｄｔｏｃｏｍｐｒｉｓｅａｎｅｗｃｌａｓｓｏｆｃｏｍｐｏｕｎｄｓｗｉｔｈｐｏｔｅｎｔｉａｌｆｏｒｓｅｌｅｃｔｉｖｅｃｕｔａｎｅｏｕｓｒａｄｉｏｐｒｏｔｅｃｔｉｏｎｗｉｔｈｏｕ… 相似文献
13.
荧光法分析测定β-环糊精 总被引：1，自引：0，他引：1
β-环糊精(β-CD)对新合成的荧光试剂5,10,15-三苯基-20-［4-6-［4-(10,15,20-三苯基)-5-钴卟啉基］己氧基］苯基卟啉(TPP-CoTPP)有荧光增强作用，据此建立了测定β-CD的新方法，在最优条件下，该方法的线性范围为8.92×10 相似文献
14.
西安交通大学物理教学实验中心坚持学生知识、能力和素质协调发展的理念,结合学校“2 4 X”的学生培养模式,根据“三个基本”、“两个综合”和“一个拓展”的3层次物理课程设置框架,实施了分专业类别、分层次和开放式教学模式的物理实验教学新体系。 相似文献
15.
Harsh Suri 《International journal of qualitative studies in education》2013,26(7):889-911
The purpose of research synthesis is to produce new knowledge by making explicit connections and tensions between individual study reports that were not visible before. Every effort of synthesizing research is inevitably premised on certain epistemological assumptions. It is crucial that research synthesists reflect critically on how their epistemological positioning enables them to pursue certain purposes while preventing them from pursuing other purposes. The literature on research synthesis methods is dominated by publications premised on positivist assumptions. The rhetoric of systematic reviews, best-evidence synthesis and What Works Clearinghouse privileges syntheses with positivist orientations. Contesting the hegemony of positivist research syntheses, this paper makes a case for research syntheses that are informed by diverse epistemological orientations. It illuminates how research syntheses with distinct epistemological orientations can serve complementary, equally worthwhile, purposes. 相似文献
16.
旅游业是一门高度关联的新兴产业,具有很强的综合性。从新疆石河子旅游业发展的现状出发,分析一下旅游业发展对石河子地区经济发展的积极影响和消极影响,可以看出旅游业发展对石河子经济的积极影响远大于消极影响,但要成为一条旅游热线仍有很长的路要走。 相似文献
17.
The production of written syntheses, which requires reading various sources and integrating information from these sources
into one’s own text, has been characterised as a potentially useful task for promoting constructive learning. This article
describes research aimed at examining and characterising written syntheses and the processes involved in producing them.
A case study was carried out of 45 students from four different educational levels (ranging from secondary school to university)
performing synthesis tasks set by their teachers. An analysis was made of the synthesis tasks set and the syntheses produced,
the prototypical procedures carried out at each educational level, and the quality of the written products. 相似文献
18.
N. R. Krishnaswamy 《Resonance》1996,1(10):37-43
We will discuss in this article an outline of the biosynthesis and a few laboratorydesigned syntheses of camphor. 相似文献
19.
N. R. Krishnaswamy 《Resonance》2011,16(12):1287-1293
We will discuss in this article an outline of the biosynthesis and a few laboratory-designed syntheses of camphor. 相似文献
20.
The purpose of this review was to examine the methods used to conduct meta-analyses of single-subject research involving students with and at-risk for disabilities. Specifically, the procedures used for preparing, aggregating, analyzing, and evaluating single-subject data across 68 primary syntheses were examined. In addition to these methodological and reporting issues, the present review also considered various characteristics of syntheses to determine their overall prevalence and focus. Results of the review indicated that the publication rate of single-subject meta-analyses has increased considerably in recent years, focusing equally on students with high- and low-incidence disabilities. This review revealed considerable variability in the methods and procedures used to synthesize single-subject research. Based on these findings, suggestions for future single-subject meta-analyses were made. 相似文献