共查询到20条相似文献，搜索用时 281 毫秒
1.
以高度有序的多孔阳极氧化铝(PAA)膜为模板，利用非常简单的模板润湿技术制备了聚甲基丙烯酸甲酯(PMMA)纳米管阵列。通过场发射扫描电子显微镜(SEM)表征了纳米管阵列表面的网状结构和纳米管的孔径等。结果表明，在多孔阳极氧化铝整齐的纳米孔洞中制备了聚甲基丙烯酸甲酯纳米管阵列，PMMA纳米管外径约300nm,这种模板润湿法还可以用来制备其他聚合物、金属以及金属氧化物的纳米管或纳米线。 相似文献
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以静电纺丝法制备的战H6P2W18O62/PVA为模板，制得了H6P2W18O62掺杂的聚苯胺材料，并用红外光谱和扫描电镜（SEM）对其进行了表征，四探针法测定了产品的电导率．结果表明：聚苯胺纳米棒的直径200～300nm；最高导电率为2.3S／cm． 相似文献
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以膜转移技术在铟掺杂氧化锡（ITO）导电玻璃电极表面构建聚苯乙烯微球有序排列结构,并以电极表面有序排列的聚苯乙烯微球为模板,采用电化学沉积法在电极表面构筑了有序的氧化钨微球腔阵列,进一步在氧化钨球腔内电化学沉积聚苯胺,在ITO电极表面形成氧化钨／聚苯胺复合修饰层．在1mol／LH2SO4溶液中,复合电极表现出良好的超级电容器电极特性． 相似文献
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《潍坊教育学院学报》2019,(4):85-89
合成一系列不同直径的聚苯乙烯小球,以其为硬模板包裹苯胺,并在其表面修饰低表面能物质十二烷基苯磺酸钠(SDBS)制备了超疏水性聚苯胺/聚苯乙烯复合微球。通过模拟昆虫复眼结构,利用聚苯乙烯小球层层堆积,并在其表面聚合成聚苯胺纳米结构阵列使其表面获得超疏水性能。此外我们还通过模型模拟,能量分析计算出理论接触角以及所处的超疏水状态。 相似文献
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就目前对转录过程中做模板的DNA链的称呼问题阐述了个人的看法，认为不应以转录产物RNA作为命名的参照物．应从遗传信息的源信息、编码方式和表达方式来综合分析和命名，并提出作模板的链应称之为正义链． 相似文献
6.
磷钨酸掺杂聚苯胺催化剂催化合成苹果酯-B 总被引：3，自引：0，他引：3
报道了磷钨酸掺杂聚苯胺催化剂H3PW12O40／PAn的制备，通过乙酰乙酸乙酯和1，2-丙二醇反应合成了苹果酯-B，探讨了磷钨酸掺杂聚苯胺催化剂对缩酮反应的催化活性，较系统地研究了原料量比，催化剂用量，反应时间诸因素对产品收率的影响，实验表明：磷钨酸掺杂聚苯胺催化剂是合成苹果酯-B的良好催化剂，在n(乙酰乙酸乙酯)：n(1，2-丙二醇)=1：1.5，催化刺用量为反应物料总质量的1．0％，环己烷为带水剂，反应时间50min的优化条件下，苹果酯-B的收率可达85．0％. 相似文献
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分别以直径约为0.2 mm的细铜丝和直径约为1mm的细铜丝环为模板,制得了不同微观结构、不同酸掺杂的聚苯胺材料,用红外光谱和扫描电镜对其进行了表征,讨论了不同酸掺杂和不同形态模板对聚合产物气敏性的影响.常温下,通过聚苯胺的气敏性能测试,以多酸掺杂细铜丝环为模板合成的聚苯胺的气敏性能更好,其中以H6P2Mo18O62掺杂合成的聚苯胺微米球对100 ppm NH3的灵敏度最高,响应时间最短.最后初步探讨了聚苯胺的气敏机理. 相似文献
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不同质子酸掺杂聚苯胺的吸波性能研究 总被引：3，自引：0，他引：3
采用3厘米波导式测量线在8—14GHz频率范围内，用多点拟合的实验和计算方法对掺杂聚苯胺的微波吸收特性及参量进行了研究．发现：浓H2SO4掺杂本征态聚苯胺(PAn)所合成材料的电损耗很小、磁损耗较大(相对于盐酸聚苯胺而言)，且不利于对微波的吸收：FeCl3掺杂浓H2SO4-PAn材料可合成磁损耗较高、基本上有利于吸收微波的材料；更令人注意的是，利用HCl-PAn具有较大的电损耗，浓H2SO4-PAn—FeCl3材料具有较大的磁损耗这一特点，我们将它们按一定的比例混合，可以合成出平均衰减为13．37dB，最大衰减为26．7dB，密度为0．7g／cm^3、频宽为10．34—14GHz的很有利于吸收微波的材料． 相似文献
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利用循环伏安法(CV)和模板(阳极氧化铝模板(AAO),制备出多孔粗糙金纳米管,壳聚糖将(AAO制备所得)其固定在玻碳电极上,然后将模板溶解,制得金纳米管修饰的传感器,并将其用于抗坏血酸(AA)和尿酸(UA)的直接电化学测定。利用电子扫描电镜(SEM)分析了金纳米管的微观形貌,通过微分差示脉冲伏安(DPV)和循环伏安法考察了抗坏血酸和尿酸在修饰电极上的电化学行为。结果表明,该传感器检测抗坏血酸和尿酸的线性范围分别为1.02×10-7～5.23×10-4mol·L-1和1.43×10-7～4.64×10-4mol·L-1,检测下限分别为1.12×10-8mol·L-1和2.24×10-8mol·L-1。该传感器具有稳定性好,制作简单,使用寿命长等特点,为实际样品中抗坏血酸和尿酸的测定提供了一种新的简便手段。 相似文献
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以正硅酸四乙酯（TEOS）为硅源,十二胺（DDA）为模板剂制备HMS介孔分子筛,考察了模板剂脱除方法对HMS介孔分子筛结构的影响.结果表明：采用高温焙烧法脱除模板剂简单易行,但对分子筛结构有部分破坏作用;而采用溶剂萃取法脱除模板剂,介孔结构的有序性能得到很好的保持,但是周期较长.最后针对两种方法的优缺点,提出了各自的改进方法. 相似文献
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介孔炭是吸附材料中孔利用率较高的一种材料,其结构不同对污染物的吸附能力也不相同.该文通过改变模板剂与碳源质量比的方法制备出不同孔径分布的介孔炭材料,从而实现污染物的高效去除.同时研究了合成材料对罗丹明B、亚甲基蓝和活性艳红等目标污染物的染料溶液的吸附性能.实验采用挥发自组装的方法合成介孔炭材料,采用扫描电子显微镜以及氮气吸—脱附实验对介孔材料进行了分析,并通过控制溶液的p H、温度以及反应时间研究合成介孔炭材料对目标污染物的吸附影响.结果表明,介孔炭材料具有有序介孔结构,孔径在1.286~3.008 nm范围内可调控,并且孔径分布最均匀的介孔炭对不同的染料的饱和吸附量在15.55~24.83 mg/g之间变化,不同孔径分布的介孔炭对相同的染料的饱和吸附量在8.75~24.83 mg/g之间变化,合成材料表现出了较好的选择吸附能力. 相似文献
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以溶胶凝胶法室温下合成了HMS分子筛原粉(DDA-HMS),考察了索氏抽提法脱膜过程中的抽提条件对HMS中孔结构及有序度的影响,X射线衍射(XRD)、傅立叶红外(FTIR)、扫描电镜(TEM)、X射线光电子能谱(XPS)及失重与差热(TG-DTA)分析表明:不同的抽提溶剂和抽提时间对HMS材料的结构具有不同程度的影响,并首次发现以丙酮抽提DDA合成的HMS具有最稳定的中孔结构和较高的中孔有序度. 相似文献
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《Chinese Education & Society》2013,46(4):228-264
In the 16 years since the establishment of the political authority of the Chinese Communists the only officially promulgated educational system has been that of 1951. When this educational system was promulgated, all the newspapers on the Mainland and the renowned scholars concerned with education rushed to proclaim its "excellent" nature. They compared it with the educational system that had been promulgated by the Kuomintang government in 1928 and emphasized the differences between them; for example, everyone praised highly "the unified five-year primary school system," "the system of accelerated schools for workers and peasants," "spare-time education," etc. However, the Chinese Communists ordered that the unified five-year primary school system "stop being implemented" in December 1953, and they continued to use the 4-2 system. In addition, the accelerated schools for workers and peasants, another "excellent point," were also ordered to "stop recruiting students" in the autumn of 1955. Finally, in 1957, the Chinese Communists again stressed that the educational system must be reformed, and therefore they organized discussions on broadening development in every locality, set up experimental points, and engaged in educational reform experiments. However, up until today, there have been no results. For the last several years the education work of the Chinese Communists has again concentrated on using all their strength to develop part-time work, part-time study and part-time farming, part-time study education and to systematize and determine the educational system. This essay concerns simply the process of the evolution and the development of this aspect, as will be seen below. 相似文献
17.
廖畅生 《赣南师范学院学报》1990,(Z1)
以三乙醇胺作模板剂,用水热法合成了MnCoAPO-5分子筛。用X射线衍射,电子探针,红外光谱等方法进行了结构研究,并测定了其晶胞参数和化学组成,同时对此分子筛的晶体形貌,热稳定性,吸附性能和比表面等进行了研究。证明锰和钴同时进入AlPO-5分子筛骨架而未改变结构类型。 相似文献
18.
Chia-Shing Yang David M. Moore John K. Burton 《Educational technology research and development : ETR & D》1995,43(4):60-70
In applied courseware production settings, two equally important processes tend to vie for attention: Instructional Design (ID) and Management. Together, these two processes comprise instructional systems development (ISD). To ensure the instructional appropriateness of courseware, an ID model is proposed to remind producers of the important instructional factors and process. This model contains three stages. The analysis stage draws out and documents background information. The development stage constructs content, measurement, strategies, media, and settings. This stage can be further divided into prototype design and formal production. The last stage is the evaluation stage which includes pilot testing and summative evaluation.This paper also proposes a project template to manage production activities based on a software engineering approach. This template prescribes a procedural flow, role explanation, and task definition. It helps producers to estimate and coordinate the efforts of the production team. Its step-by-step confirmation ensures that the courseware product will meet the customer's needs. An example project was used to verify the usefulness of the ID model and project template. 相似文献
19.
采用十二烷基磺酸钠(SDS)作模板并以明胶作稳定剂,在空气-水的界面上组装TiO2薄膜。结果表明,加入的明胶既是一种良好的成膜剂,又是薄膜中TiO2颗粒的稳定剂。经洗涤去除明胶后,此复合薄膜材料可转换成单一的层状TiO2薄膜,其薄膜中TiO2颗粒的平均粒径与原先加入的明胶浓度成反比。在此基础上,分析了明胶稳定TiO2颗粒的机理并建立了相关模型。 相似文献
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Discriminating same from different multiitem arrays can be represented as a discrimination between arrays involving low variability and arrays involving high variability. In the present investigation, we first trained pigeons with the extreme values along the variability continuum (arrays containing 16 identical items vs. 16 nonidentical items), and we later tested the birds with arrays involving intermediate levels of variability; we created these testing arrays either by manipulating the combination of same and different items (mixture testing) or by changing the number of items in the same and different arrays (number testing). According to an entropy account (Young & Wasserman, Journal of Experimental Psychology: Animal Behavior Processes 23:157?C170, 1997), the particular means of changing variability should have no effect on same?Cdifferent discrimination performance: Equivalent variability should yield equivalent performance. In this critical test of an entropy account, we found that entropy could explain a large portion of our data, but not the entire collection of results. 相似文献