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Search Results: 1 - 10 of 12686 matches for " 庞莹 "
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基于金纳米粒子的对乙酰氨基酚传感器的研究
Electrochemical Sensor for Acetaminophen Based on Gold Nanoparticles
 [PDF]

, 徐芬, 孙立贤
Advances in Analytical Chemistry (AAC) , 2013, DOI: 10.12677/AAC.2013.33004
Abstract: 本文采用循环伏安法将金纳米粒子修饰在玻碳电极表面,制备了GNPs/GC修饰电极。对修饰电极进行电化学及表面形貌的表征,通过循环伏安法和交流阻抗法研究了ACOPGNPs/GC电极上的电化学行为。本文探讨了不同实验条件对电极性能的影响,在最优条件下,ACOP线性浓度范围分别为2.0 × 107~2.0 × 105 molL11.4 × 104
我国高新技术开发区比较研究
,刘志迎,姜山
科技进步与对策 , 2009,
Abstract: 以网络效应经济理论、产业经济学理论和西方经济学理论为基础,运用定量和定性方法,从产业集群的形成、产业集群的生产过程以及产业集群创新3个方面,针对我国53个高新区进行比较,提出改善区位布局、调整结构、加强制度建设等提高我国高新区网络效应的建议。区域经济产业集群高新技术产业开发区
1000kV变电站主变110kV侧并联电容器装置的参数选择
吴祎琼,黄宝,燕立,亚东
电网技术 , 2009,
Abstract: 1000kV变电站主变低压侧的无功设备是特高压电网无功调节的重要手段。与超高压电网相比,特高压变电站低压无功设备的电压更高、容量更大,其参数的确定有其特殊性,因此成为特高压变电站设计中的重要部分。本文重点针对低压电容器装置,确定其分组方式及分组容量,同时研究低压电容器装置的设备参数选择、接线方式,并对电容器装置的合闸涌流进行校核。
锂离子电池纳米正极材料合成方法研究进展
春会,吴川,吴锋,,陈实
硅酸盐学报 , 2012,
Abstract: 纳米材料具有独特的物理和化学性质。纳米技术的应用为开发高能量和高功率的锂离子电池多元化发展提供了方向,成为锂离子电池电极材料发展的重要途径。本文介绍了纳米级锂离子电池正极材料的各种合成方法及电化学性能,如固相法喷雾干燥法、微波合成法、溶胶凝胶法、冷冻干燥法等,指出电极材料纳米化应用中的问题并给出建议,展望了纳米正极材料实用化的美好前景。
基于两点式数据关联算法的多机动目标跟踪
李辉,张安,赵敏,,
电子学报 , 2005,
Abstract: 本文首先分析了两点式概率数据关联算法,在此基础上将其与交互式多模型算法结合起来提出了一种用于跟踪多机动目标的新算法.由于充分利用了两点式数据关联算法在关联精度和计算量上的优越性,所提出的新算法无论在跟踪精度方面,还是计算量上都有很大的改善.理论分析与仿真结果验证了该算法优于传统的交互式多模型联合数据关联算法.
乳铁蛋白和乳铁素的抗菌活性比较
胡志和,,广昌,陈庆森
食品科学 , 2005,
Abstract: ?牛乳铁蛋白是从牛乳中提取出来的一种铁结合性糖蛋白,牛乳铁素是从牛乳铁蛋白n-端水解下来的25个氨基酸残基。它们具有多种生物学功能,其中的广谱抗菌性尤为引人注目。本实验以牛初乳中提取的乳铁蛋白及其水解产物乳铁素为研究对象,选取大肠杆菌为实验菌株,进行铁饱和乳铁蛋白和缺铁性乳铁蛋白、乳铁素对大肠杆菌生长抑制的比较研究。研究结果表明:铁饱和乳铁蛋白、缺铁性乳铁蛋白和乳铁素的最小抑菌浓度分别为6mg/ml、3mg/ml和15μg/ml,乳铁素的最小杀菌浓度为30μg/ml。乳铁蛋白水解后,经纯化获得的乳铁素,其抗菌能力较缺铁性乳铁蛋白增加200倍,较铁饱和乳铁蛋白增加400倍。
Angular Distributions for Heavy Quarkonium Decays into Baryon--Antibaryon Pairs
Angular Distributions for Heavy Quarkonium Decays into Baryon-Antibaryon Pairs

PANG Cai-Ying,PING Rong-Gang,
,平荣刚

中国物理快报 , 2007,
Abstract: Based on the naive quark model, we calculate angular distributions for heavy quarkonium decays into pN* (1440), decuplet baryon pairs, and octet-decuplet baryon pairs. The general formulae of angular distributions are given explicitly. Quark mass effects on the violation of the helicity conservation and the prospect to look for them in J/ψ hadronic decays are discussed.
Pollutant distribution in urban dusts of Baoding and health risk assessment
保定城区地表灰尘污染物分布特征及健康风险评价

郑小康,李春晖,黄国和,杨志峰,爱萍,
环境科学学报 , 2009,
Abstract: This study focused on characterization of heavy metals and nutrients in the dust of the city of Baoding, China. Thirty six samples were collected from fourteen sampling points including six land-use types. Most of the sites were impervious ground such as office, commercial, residential, industrial and traffic areas, as well as building roofs. Concentrations of Cd, Cr, Cu, Pb, Zn and organic N and P were measured to investigate their distribution and possible sources. The results showed that the mean concentration of pollutants in the building roofs was generally higher than in other areas, followed by the commercial, traffic, industrial, office and residential areas. In addition, the highest concentrations of Cd (5.10 mg·kg-1), Cr (470 mg·kg-1), Pb (997 mg·kg-1), Zn (1377 mg·kg-1) and P (999 mg·kg-1) were found on the building roofs. However, the highest concentration of Cu (867 mg·kg-1) and N (19.40 mg·kg-1) were found in commercial areas. Cd and Cr had the most complex and varied sources. The concentrations of Pb, Zn and Cu in all areas were more consistent and had significant correlations, indicating they were mainly from traffic emissions. Based on the above data, the CDI (chronic daily intake) model was applied to assess the health risks associated with Cd, Cr, Cu, Pb and Zn in the dust of Baoding. The results showed that the cancer risk index of Cd was 1.25×10-5, which was higher than the soil management standard of the EPA. The high cancer risk indexes indicate a possible increase of approximately 12.5 cancer patients per million people. The non-cancerous average risk index (0.124) of the five heavy metals was less than the standard value, which implied a non-carcinogenic risk to the health of the residents.
Clustering Analysis of Sentiment Polarity for Chinese Blogs Based on Concept
基于概念的中文博客情感极性聚类分析

SHEN Ying,XU Dong-Ping,PANG Jun,
,徐东平,

计算机系统应用 , 2011,
Abstract: A clustering method based on concept was provided to analyse the sentiment polarity for Chinese Bloggers.The concept is introduced into Vector Space Model(VSM) on the basis of HowNet.Firstly,sentiment words are extracted from blog texts which would be expressed by VSM with the concept of sentiment words.Secondly,blog texts are clustered with k-means algorithm to finish the analysis of sentiment polarity for Chinese Blogs.The precision of sentiment polarity analysis of Chinese Blogs is improved with concept ...
Service-Virtualization Model Based on Dynamic Semantic
面向最终用户编程的服务虚拟化模型

ZHANG Yu-Hang,GUAN Ying,PANG Tao,
张宇航
,,

计算机系统应用 , 2010,
Abstract: 为了解决面向最终用户编程问题,提出了一种基于动态语义的服务虚拟化模型。该模型以SOA思想理论为基础,采用面向服务计算和Web服务技术,结合本体服务描述语言和描述逻辑,建立服务虚拟化模型,从而实现面向最终用户编程。该模型有效地提高了模型的查全率和查准率,能够在一定程度上解决软件危机。
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