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Search Results: 1 - 10 of 44931 matches for " 修振佳 "
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大孔径毛细柱的研制及评价
,李浩春,张玉奎
色谱 , 1993,
Abstract: 大孔径毛细柱在国外(如SUPELCO公司)已有商品出售。国内也有文献报道。我们根据大庆石油管理局需求。研究了不同口径毛细柱的制备方法并对其性能做了考察。 一、大孔毛细柱的制备 (一) 用95硬质玻璃拉制成0.42、0.55、0.7mm不同口径的玻璃毛细管柱。经1∶1盐酸处理后,使用国产甲基乙烯基硅橡胶固定液(相当于OV-1)涂渍。对于口径0.42mm和0.55mm的毛细管柱可采用动态涂渍或静态涂渍,而对于0.7mm口径的毛细管柱,
交联国产甲基乙烯基硅橡胶固定相的玻璃毛细管柱
,李浩春,卢佩章
色谱 , 1985,
Abstract: 据文献报导,交联毛细管柱的种类可分为Si—O—Si键型和Si—C—C—Si键型,后者多半使用辐射法、过氧化物法、偶氮化合物法引发交联反应。 在给定的温度下,过氧化物的氧含量在一定温度下损失一半所需要的时间,称为过氧化物的半寿命。异丙苯基过氧化物在135℃的半寿命为1小时。过氧化物在一定温度下分离出有一定的活性和一定数量的初级游离基。所谓活性是指初级游离基和单体加成的能力;所谓数量是指过氧化物释放游离基的速度。异丙苯基过氧化物的分解产物通常
催化裂化加氢色谱法测定水中总有机碳
,邹桂香,唐学渊
分析化学 , 1986,
Abstract: 水中有机物质的含量是评价水质的一个重要指标,常以总有机碳(TOC)表示之.其测定方法已有很多报导.本文介绍一种新的分析流程:先使水中有机物在镍催化剂上直接裂解加氢成甲烷[1-4],用氢火焰离子化检测器测定水样中总碳(有机碳与无机碳之和).然后将水样通过150℃载有磷酸的石英毛层,使碳酸盐分解为二氧化碳,并在镍催化剂上还原为甲烷,按上法测定无机碳,由二者之差得出总有机碳.
Study on Cross Linked Capillary Columns Coated with Polyphenylenesiloxane
聚苯撑基硅氧烷交联毛细管柱的研究

Z Xiu,Y Cheng,Q Hong,
,程悦生,洪群发

色谱 , 1997,
Abstract: A new type of cross-linked capillary column coated with polyphenylenesiloxane which possesses phenylene in the siloxane main chain has been described in this paper. The cross-linking of polyphenylenesiloxane was performed in situ by the induction of DCUP. The structure of polyphenylenesiloxane is as followed: structure: see text] The repeatabilities and solvent inextractabilities of the column preparations were investigated. For decane and 1-octanol, the values of n/L and k' at 120 degrees C were 2800-3100 and 1.0-1.3, 2400-2800 and 5.0-6.0, respectively. The k' values of the columns scarcely changed after eluting with methylene chloride and pentane. The base-acid property was studied by analyzing 2,6-dimethylphenol and 2,6-dimethylaniline. Besides, in comparision with OV-17 and OV-25, the McReynolds' constants of the cross-linked column were also determined. The advantages of this kind of column are summarized as (1) easy preparation; (2) heat stability improved; and (3) good selectivity for the organic compounds which contain halogen, nitro group or phenol.
Analysis for the Edible Oil of Crab Taste by Gas Chromatography
气相色谱法分析食用蟹味油

Xiu Zhenjia,Zhu Damu,Xu Guowang,Zhang Yukui,
,朱大模,许国旺,张玉奎

色谱 , 1996,
Abstract: 气相色谱法分析食用蟹味油修振佳,朱大模,许国旺,张玉奎(中国科学院大连化学物理研究所,国家色谱研究分析中心大连116012)关键词毛细管气相色谱法,蟹味油,成分鉴定1前言气相色谱法(GC)适用于研究食品添加剂的风味与香气分析,所涉及的范围很广泛[1]...
Direct Determination of Benzene in Air by Gas Chromatograpby
气相色谱法直接测定空气中微量苯

Xiu Zhenjia,Xu Fangbao,Zhang Xiangmin,Zhang Yukui,
,徐方宝,张祥民,张玉奎

色谱 , 1994,
Abstract: rapid and reliable gas chromatographic method for the determination ofbenzene in air is presented.The method requires ouly saturated vapour of benzene for making standard.
Chromatographic Analysis of Trace Impurities in Acrylamide
丙烯酰胺中痕量杂质色谱分析

Xiu Zhenjia,Zhang Tongfeng,Luo Chunrong,Xu Guowang,Zhang Yukui,
,张桐凤,罗春荣,许国旺,张玉奎

色谱 , 1995,
Abstract: 丙烯酰胺中痕量杂质色谱分析修振佳,张桐凤,罗春荣,许国旺,张玉奎(中国科学院大连化学物理研究所,国家色谱研究分析中心大连116012)1前言合成聚丙烯酰胺的单体丙烯酰胺的纯度可能影响其聚合速度和产物的分子量,为保证聚丙烯酰胺产品质量,分析单体丙烯酰胺...
我国水环境问题与科技支撑体系
Water Environmental Problems and Science and Technology Support System in China
 [PDF]

曾凡棠,,
Sustainable Development (SD) , 2012, DOI: 10.12677/SD.2012.24022
Abstract: 我国经济的持续快速增长使水环境问题愈显突出,已成为制约国民经济和社会发展的主要因素之一。本文总结了中国目前的水量、水质、水生态以及水环境决策与管理体制等具有中国特色的水环境问题,提出了中国水环境问题的解决需要自主创新的科技体系做支撑,并在水环境科技的发展方向、认知系统、环境知识、环境技术、环境经济以及管理体系等方面提出了有效的建议。
The rapid growth of Chinese economy brought about water environmental problems, which has restricted the national economic and social development severely. First of all, this paper summarized the quantity and quality of the current water in China, the water ecology and water environment decision-making and management system with Chinese characteristics and etc. Furthermore, the paper pointed out that, the independent innovation of science and technology system would solve the water environmental problems. Finally, the paper put forward some effective suggestions on the water environment science and technology development direction, cognitive system, environmental knowledge and technology, environmental economy and environment management system.
政府在公共信息资源管理中的角色定位2

图书情报工作 , 2007,
Abstract: ?针对目前政府在公共信息资源管理中存在的角色定位不清晰的问题,从新公共服务的视角,分析政府在公共信息资源管理过程中要承担的资源建设者、维护者、提供者、管理主体协调者等主要角色。并在此基础上,提出政府在这一过程中应坚持公共性、绩效性、竞争性等原则,以使政府在公共信息资源管理方面更好地发挥作用。
人工免疫的神经网络预报方法及其应用
,许强,曹长
重庆大学学报 , 2008, DOI: 10.11835/j.issn.1000-582X.2008.12.012
Abstract: 针对RBF(radialbasisfunction)神经网络在预测铁水含硅量中出现的预测精度低,收敛速度慢的问题,提出了一种基于免疫识别原理的径向基函数神经网络的学习算法。该算法利用人工免疫原理确定高斯基函数的中心和宽度参数,同时将所识别的数据作为抗原,抗体作为抗原的压缩映射并作为神经网络的隐层中心,利用递推最小二乘法(recursionleastsquare,RLS)确定连接权值,提高了RBF神经网络的收敛速度和精度。应用该模型于某大型钢铁厂高炉铁水硅含量预报的实例中,实验结果表明,该模型
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