排序方式: 共有17条查询结果,搜索用时 15 毫秒
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用沉淀法来研究超细二氧化钛在水中的分散情况,对比了自制产品丙烯酸-二甲基丙烯酰胺-二甲基丙磺酸共聚物(AA/AMPS)钠盐和国外分散剂产品YUS—WGS(聚羧酸酯)在不同分散剂用量、不同溶液pH值时对水相中二氧化钛的分散情况的影响,实验证明两者的分散性能相当,自制产品可以替代国外产品作分散剂使用。 相似文献
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采用脉冲激光轰击浸于流动液相中固体靶(PLA-IT/SFL)的新方法,在不同组成的微乳液液相中成功制备并组装了sp^3纳米碳团簇,通过TEM、UV-Vis、FT-IR、F1uorescence spectrum等方法对其形貌、结构、性质进行了表征。研究结果表明微乳液的组成对所得碳颗粒的形貌及性质有很大影响。 相似文献
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To mitigate the Non-Line-of-Sight (NLoS) error which seriously affects the localization accuracy and robustness in complex indoor environment, a novel Iterative Minimum Residual (IMR) based on the consistency hypothesis of the residual and the error is proposed in this paper. It chooses the best subset of measurements to calculate the coordinates of the unknown node by comparing the residuals obtained with different subsets of beacons. To reduce the time complexity of the IMR algorithm, Spatial Correlation Filter (SCF) is also proposed, which can remove the most serious NLoS distance with low calculation cost. Combined with the proposed SCF and IMR algorithm, nodes can be localized with high accuracy and low time complexity. Experimental results with real dataset demonstrate that the proposed algorithm can identify the NLoS range effectively with about 50% time cost of employing SCF only. 相似文献
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针对无线传感器网络定位的精度问题,提出一种基于加权Voroni图的无需测距的分布式定位算法(weighted Voronoi diagram based localization algorithm, WVL).对待定位节点接收到的来自锚节点的信号强度(RSSI)进行从大到小的顺序排序,并将这些一跳锚节点的权值赋值为相对应的RSSI值.利用节点的一跳邻居和二跳邻居表将集中式计算转换为分布式计算,分别计算锚节点的W-Voronoi图,求这些图的交集后再取交集的质心,即可得未知节点的位置参数.通过仿真对比基于W-Voronoi图和Voronoi图,以及加权质心定位算法,仿真结果证明基于W-Voronoi图的算法精度更高. 相似文献
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