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Search Results: 1 - 10 of 126245 matches for " 周敏彤 "
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Research of Geometric Model for Binocular Perception
双眼立体感知几何模型的研究

梁栋,
中国图象图形学报 , 1998,
Abstract: 利用普通针孔成象的双摄像模型对双眼立体感知几何模型进行了研究,详细讨论了体视象空间的视觉重构,最后通过实验分析了影响体视的因素。
双眼立体感知几何模型的研究
梁栋,韦穗,
中国图象图形学报 , 1998, DOI: 10.11834/jig.199808209
Abstract: 利用普通针孔成象的双摄像模型对双眼立体感知几何模型进行了研究,详细讨论了体视象空间的视觉重构,最后通过实验分析了影响体视的因素。
DOI:10.7524/j.issn.0254-6108.2014.05.026
赵钰,董黎明,秦泽,
环境化学 , 2015,
Abstract:
原位接枝改性纳米二氧化硅/聚丙烯复合材料Ⅰ:结构表征
,阮文红,王跃林,,章明秋
复合材料学报 , 2006,
Abstract: 以熔融原位接枝的方式,制得聚丙烯酸丁酯(PBA)接枝改性纳米SiO2/聚丙烯复合材料,并利用转矩流变、红外光谱、热重分析、X射线光电子能谱、透射电镜和动态力学分析等技术研究了原位接枝的机理以及相应复合材料的结构。结果表明:熔融共混过程中PBA通过化学键的形式接枝到纳米SiO2的表面,促使其在聚丙烯基体中得到较好的分散,而且粒子表面的接枝聚合物分子链和基体大分子链相互缠结,这样的结构加强了纳米粒子和基体间界面相互作用,将有利于提高复合材料的机械性能。
原位接枝改性纳米二氧化硅/聚丙烯复合材料Ⅱ:性能测试
,阮文红,王跃林,,章明秋
复合材料学报 , 2007,
Abstract: 通过熔融共混过程中原位接枝的方法制得聚丙烯酸丁酯接枝改性纳米二氧化硅/聚丙烯(SiO2-g-PBA/PP)复合材料,探讨了材料制备的最佳工艺条件,研究了复合材料的机械性能、结晶性能、微观形貌以及动态黏弹行为。结果表明,少量纳米粒子(体积分数≤1.36%)的加入即可对PP起到同时增强增韧的作用,制备SiO2-g-PBA/PP的适宜工艺条件为熔融共混温度180℃,共混时间10min,转子转速60r/min。对复合材料结晶行为的研究表明,纳米粒子的成核效应使PP的结晶速率加快。微观形态观察表明,纳米粒子与聚合物基体间具有良好的界面结合,这一点从对材料动态黏弹行为的研究中得到进一步证明,从而阐明了纳米粒子增韧增强聚合物的机理。
基于Hankel范数模型降价的控制对象的名义模型选择

自动化学报 , 1997,
Abstract: ?研究了控制对象具有多个模型时,求取其适合鲁棒控制器设计的名义模型的问题.提出了一种基于Hankel范数模型降阶的名义模型选择算法.仿真结果确认了算法的有效性.
比值导数光谱法同时测定饮料中糖精钠和苯甲酸

中国公共卫生 , 2002, DOI: 10.11847/zgggws2002-18-06-63
Abstract: ?比值导数光谱法是在多波长线性回归的基础上发展起来的一种新的多组分光谱分析方法〔1,2〕,该法利用二元混合物的混合光谱与其中某一组分的光谱比值对波长求导,可分辨重叠光谱.本文研究了糖精钠和苯甲酸的导数光谱,并用比值导数光谱法进行处理,提出了同时测定二组分的导数光谱—比值导数分光光度法,该法无需分离,分辨能力强,能有效地消除干扰,提高灵敏度,对合成样品及饮料中糖精钠和苯甲酸的测定均获满意结果.报告如下.
北京市大气细颗粒物对Balb/c3T3细胞周期的影响
张旻,付娟玲,王芸,何凌燕,,,宗灿
环境科学学报 , 2004,
Abstract: 研究了北京市大气细颗粒物有机提取物(EOC)对Balb/c3T3细胞周期及调节因子的影响.实验发现116μg/mL细颗粒物EOC即有明显的细胞毒性,抑制细胞生长,并存在剂量反应关系,IC50为402.2μg/mL;流式细胞仪分析显示1366μgmLPM2.5EOC可造成细胞周期改变,G0/G1期、G2M期细胞分布增加,分别为16.24%(P<0.01)与3.17%(P<0.05),S期细胞分布减少20.%(P<0.01),并伴有P53含量的增加;409.8、478.1μg/mL的PM2.55EOC可诱导Balb/c3T3细胞凋亡.提示PM2.5有机提取物可能通过P53途径引起Balb/c3T3细胞周期阻滞,并诱导细胞凋亡.
基于NaCl高效聚集纳米金的比色适配体传感器检测多菌灵
Colorimetric aptasensor for carbendazim determination based on the salt-induced aggregation of gold nanoparticles

倪璇,,吴诗剑,邱建,张通,张东伟,王鲁梅
- , 2018,
Abstract: 植物体和水体中残留的多菌灵通过食物链进入生物体,最终对生物体健康造成威胁,已经引起了社会的广泛关注。现有的检测方法虽然具有一定的灵敏度和精确性,但往往需要昂贵的大型设备、专业的技术人员和较长的检测时间,因此建立快速、高效的检测方法具有重要的现实意义。在本文中,我们使用标记的多菌灵特异性适配体作为传感探针,NaCl溶液作为聚集诱导剂,纳米金粒子作为颜色指示剂,开发了一种比色适配体传感器用于检测水溶液中的多菌灵。在没有多菌灵时,纳米金颗粒被多菌灵适配体包裹,在NaCl溶液中依然维持分散。当多菌灵存在时,多菌灵适配体与多菌灵特异性结合形成稳定的复合物,此时,溶液中裸露的纳米金在NaCl的作用下聚集,整个体系从红色变为蓝色。该比色法的检测限低至2.3 nmol/L,线性检测范围为2.3~800 nmol/L。加标水样中多菌灵的平均回收率为96.3%~111.2%,相对标准偏差为1.5%~8.9%。该比色适配体传感器操作简单,检测时间短,仪器要求低,因此具有在水环境中快速检测多菌灵的潜力。
Carbendazim (CBZ) residues in plant and water bodies enter the organisms through food chain,and ultimately pose a threat to the health of organisms,which has aroused widespread concern in the society.Although the existing methods for CBZ detection have certain sensitivity and accuracy,they often need expensive large-scale equipment,professional technicians and long detection time.Therefore,it has great practical significance to establish a fast and efficient method for CBZ detection.In this paper,we developed a colorimetric aptasensor for CBZ determination in aqueous solution using label-free CBZ-specific aptamer,NaCl and gold nanoparticles (AuNPs) as sensing probe,aggregation inducer and color indicator respectively.In the absence of CBZ,AuNPs were wrapped by CBZ aptamer and maintained dispersed in NaCl solution basically.In the presence of CBZ,CBZ aptamer could specifically combine with CBZ to form stabilized complex,the AuNPs were released by aptamer and aggregated under the influence of NaCl.The color of the solution changes from red to blue.This colorimetric assay has a detection limit as low as 2.3 nmol/L,a linear range from 2.3 to 800 nmol/L.It was applied to determine CBZ in water samples with recoveries in the range of 96.3%-111.2%,and the relative standard deviation is 1.5%-8.9%.The colorimetric aptasensor is simple,convenient,rapid and low cost,so it holds potential for CBZ detection in environmental water samples.
中国天然气消费结构的模糊地域聚类
The Fuzzy Regional Clusters of China’s Natural Gas Consumption Structure
 [PDF]

仲兵, 尹海
Advances in Energy and Power Engineering (AEPE) , 2016, DOI: 10.12677/AEPE.2016.45021
Abstract:
出于提高天然气政策效率、优化天然气消费预测以及改善天然气管网规划等目的,运用基于模糊等价关系闭包的聚类方法对大陆30个省份(不含西藏) 2013年天然气消费结构进行了聚类研究。结果为,这些省份:1) 在0.9的精度水平上,共有22类,其中河北与黑龙江组成1类,山西与湖北组成1类,江西、广东、贵州、云南与陕西组成1类,其余省份各独为1类;2) 在0.8的精度水平上,共有12类,其中北京、天津、内蒙古、上海、福建、河南、海南、重庆、青海及新疆各独为1类,江苏与山东组成一类,其余省份组成1类;3) 在0.7的精度水平上,共有4类,其中重庆独为1类,北京与上海组成1类,福建、河南组成1类;4) 在0.6的精度水平上,共有2类,其中重庆独为1类,其余所有省份组成1类;5) 在0.5的精度水平上,仅有1类。据研究结果,得三个主要结论:1) 地域特征并非中国天然气消费结构差异的唯一因素;2) 重庆、北京、上海、福建以及河南在天然气消费结构方面难以与其它省份聚为1类;湖北与山西以及江西、广东、贵州、云南与陕西在这方面很大程度上又各同属一类;3) 重庆表现出了最明显的独特性。这些现象的深层原因值得进一步研究。
In order to enhance the efficiency of natural gas policy, optimize the forecast of natural gas con-sumption and improve the plan of natural gas pipeline construction, an fuzzy clustering based on the fuzzy equivalence relation’s transitive closure is applied to the natural gas consumption structures of 30 provinces (excluding Tibet) of Mainland China in 2013. The results show that, among those provinces: 1) at the accuracy level of 0.9, there are 22 clusters, with Hebei and Hei-longjiang being one cluster, Shanxi and Hubei being another, Jiangxi, Guangdong, Guizhou and Shannxi being a third and each of the rest along being a single cluster; 2) at the accuracy level of 0.8, there are 12 clusters, with Beijing, Tianjin, Inner Mongolia, Shanghai, Fujian, Henan, Hainan, Chongqing, Qinghai and Xinjiang each being a single cluster, Jiangsu and Shandong being one, and all others being another; 3) at the accuracy level of 0.7, there are 4 clusters, with Chongqing along being a single, Beijing and Shanghai being one, Fujian and Henan being another, and all others be-ing the fourth; 4) at the accuracy level of 0.6, there are 2 clusters, with Chongqing along being a single, and all others being the other; and 5) at the accuracy level of 0.5, there is only 1 cluster. Three points can be concluded from the results. First, no evidence of regional characteristic has been found associated with the structures of natural gas consumption in those provinces. Second, it turns out to be rather difficult for Chongqing, Beijing, Shanghai, Fujian as well as Henan to be classified in one cluster, while Hubei & Shanxi and Jiangxi & Guangdong & Guizhou & Yunnan & Shannxi belong to one cluster rather significantly. And third, Chongqing appears the most unique. The in depth logics of those phenomena are worth further investigation.
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