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网球发球动作和技术的研究

体育科技文献通报 2019年第11期27卷 80-82页

作者：周岱琦河南大学

为探讨网球发球动作以及技术的特征,并且分析如何通过动作以及技术的提升达到提高发球水平的目的,为增强网球发球水平提供理论依据。采用文献资料发和例案分析法对网球运动员的发球技术和动作进行了系统分析与研究。通过研究分析一些职... 详细信息

为探讨网球发球动作以及技术的特征,并且分析如何通过动作以及技术的提升达到提高发球水平的目的,为增强网球发球水平提供理论依据。采用文献资料发和例案分析法对网球运动员的发球技术和动作进行了系统分析与研究。通过研究分析一些职业网球比赛发现,世界顶级网球选手的球速和准度都是强项。在网球发球中,速度和旋转是发球的关键,而落点则是控制对方接球方向的关键。

关键词：网球发球技术

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区域编码标记交换网络性能的研究

电子科技 2005年第4期18卷 45-48,52页

作者：李兆强邱智亮周代琪西安电子科技大学综合业务网国家重点实验室陕西西安710071

着重分析了在RCLS(Region Code Label Switching)体制下路由查表的特点及实现方式,并与IPv4体制进行了对比,构建了两种体制下的查找模型,然后对目前用户所关心的网络性能参数进行了仿真,结果表明,RCLS体制能够获得更好的性能。

关键词：区域标记交换路由查找网络性能

Sensitive detection of DNA methyltransferase activity based on supercharged fluorescent protein and template-free DNA polymerization

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Science China Chemistry 2016年第7期59卷 809-815页

作者： daiqi Li Guoyan Lu Chunyang Lei Zhen Wang Lijun Li zhou Nie Yan Huang Shouzhuo Yao State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University

DNA methylation, catalyzed by DNA methyltransferases(MTases), is a key component of genetic regulation, and DNA MTases have been regarded as potential targets in anticancer therapy. Herein, based on our previously developed DNA-mediated supercharged green fluorescent protein(Sc GFP)/graphene oxide(GO) interaction, coupled with methylation-initiated template-free DNA polymerization, we propose a novel fluorescence assay strategy for sensitive detection of DNA MTase activity. A hairpin DNA with a methylation-sensitive site and an amino-modified 3′-terminal(DNA-1) was designed and worked as a starting molecule. In the presence of DNA MTase, methylation-sensitive restriction endonuclease, and terminal deoxynucleotidyl transferase(Td T), DNA-1 can be sequentially methylated, cleaved, and further elongated. The resulting long DNA fragments quickly bind with Sc GFP and form the Sc GFP/DNA nanocomplex. Such nanocomplex can effectively protect Sc GFP from being adsorbed and quenched by GO. Without the methylation-initiated DNA polymerization, the fluorescence of Sc GFP will be quenched by GO. Thus, the DNA MTase activity, which is proportional to the amount of DNA polymerization products, can be measured by reading the fluorescence of Sc GFP/GO. The method was successfully used to detect the activity of DNA adenine methylation(Dam) MTase with a wide linear range(0.1–100 U/m L) and a low detection limit of 0.1 U/m L. In addition, the method showed high selectivity and the potential to be applied in a complex sample. Furthermore, this study was successfully extended to evaluate the inhibition effect of 5-fluorouracil on Dam MTase activity and detect Td T activity.

关键词： DNA methyltransferase supercharged fluorescent protein graphene oxide DNA polymerization

Detection of hydroxyl radical in plasma reaction on toluene removal

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Journal of Environmental Sciences 2008年第12期20卷 1429-1432页

作者： Guo Yufang Liao Xiaobin Ye daiqi Guangzhou Univ Guangzhou Higher Educ Mega Ctr Coll Environm Sci & Engn Guangzhou 510006 Guangdong Peoples R China S China Univ Technol Guangzhou Higher Educ Mega Ctr Coll Environm Sci & Engn Guangzhou 510006 Guangdong Peoples R China

A new method was introduced to detect the concentration of OH radical in dielectric barrier discharge(DBD)reaction.A film, which was impregnated with salicylic acid,was used to detect OH radical in plasma reaction at room temperature and atmospheric *** acid reacts with OH radical and produces 2,5-dihydroxybenzoic acid(2,5-DHBA).Then,a high performance liquid chromatography(HPLC)was carried out to detect the concentration of 2,***,OH radical in nonthermal plasma reaction could be...

关键词： OH radical detection nonthermal plasma toluene

双向电泳在大鼠脊髓的蛋白质组分析中的应用研究

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深圳中西医结合杂志 2004年第4期14卷 202-205页

作者：郭岱琦周厚清肖建德王大平杨蕾深圳市第二人民医院广东深圳518035

目的建立大鼠中枢神经系统双向电泳技术平台,从分子水平探索中枢神经系统损伤、修复的机制。方法以固相 pH梯度等电聚焦为第一向和 SDS 均一胶 T=12.5%、10%的水平电泳为第二向成功地得到了神经组织双向电泳图谱,并借助图像分析软件... 详细信息

目的建立大鼠中枢神经系统双向电泳技术平台,从分子水平探索中枢神经系统损伤、修复的机制。方法以固相 pH梯度等电聚焦为第一向和 SDS 均一胶 T=12.5%、10%的水平电泳为第二向成功地得到了神经组织双向电泳图谱,并借助图像分析软件研究了双向电泳重复性,另外对胶的银染和脱色作了进一步改进。结果获得了重复性较好的检测蛋白点的肽质指纹图。结论本研究为大鼠中枢神经损伤、修复蛋白质组研究工具平台的建立奠定了基础。

关键词：蛋白质组双向电泳中枢神经组织

Enhanced photocatalytic activity of rGO/TiO2 for the decomposition of formaldehyde under visible light irradiation

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Journal of Environmental Sciences 2018年第11期30卷 138-146页

作者： Lian Yu Long Wang Xibo Sun daiqi Ye College of Environment and Energy South China University of Technology Guangzhou 510006 China Cuangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control Guangzhou 510006 China National Engineering Laboratory for VOCs Pollution Control Technology and Equipment South China University of Technology Guangzhou 510006 China

Due to the low concentration of indoor air contaminants, photocatalytic technology shows low efficiency for indoor air purification. The application of TiO2 for photocatalytic removal of formaldehyde is limited, because TiO2 can only absorb ultraviolet （UV） light. Immobilization of TiO2 nanoparticles on the surface of graphene can improve the visible light photocatalytic activity and the adsorption capacity. In this study, rGO （reduced graphene oxide）/TiO2 was synthesized through a hydrotherrnal method using titanium tetrabutoxide and graphene oxide as precursors, and was used for the degradation of low concentration formaldehyde in indoor air under visible light illumination. Characterization of the crystalline structure and morphology of rGO/TiO2 revealed that most GO was reduced to rGO during the hydrothermal treatment, and anatase TiO2 nanoparticles （with particle size of 15-30 nm） were dispersed well on the surface of the rGO sheets, rGO/TiO2 exhibited excellent photocatalyfic activity for degradation of formaldehyde in indoor air and this can be attributed to the role ofrGO, which can act as the electron sink and transporter for separating photo-generated electron-hole pairs through interfacial charge transfer. Furthermore, rGO could adsorb formaldehyde molecules from air to produce a high concentration of formaldehyde on the surface of rGO/ TiO2. Under visible light irradiation for 240 min, the concentration of formaldehyde could be reduced to 58.5 ppbV. rGO/TiO2 showed excellent moisture-resistance behavior, and after five cycles, rGO/TiO2 maintained high photocatalytic activity for the removal of formaldehyde （84.6%）. This work suggests that the synthesized rGO/TiO2 is a promising photocatalyst for indoor formaldehyde removal.

关键词： Reduced graphene oxide (rGO) rGO/TiO2 nanocomposites Visible light photocatalysis Indoor air Formaldehyde

Heavy Metal Removal from Water by Adsorption Using Pillared Montmorillonite

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Acta Geologica Sinica(English Edition) 2006年第2期80卷 219-225页

作者： LIU Yun WU Pingxiao DANG Zhi YE daiqi College of Environmental Science and Engineering South China University of Technology Guangzhou Guangdong 510640

Removal of Cu^2＋, Cr^3＋ and Cd^2＋ from aqueous solutions by adsorption on montmorillonite modified by sodium dodecylsulfate （SDS） and hydroxy-alumino-silicate （HAS） was investigated. Experiments were carried out as a function of solution pH, solute concentration, and time. The Langmuir model was adopted to describe the single-solute adsorption isotherm, in which the Langmuir parameters were directly taken from those obtained in single-solute systems. The kinetics of metal ions adsorption was examined and the pseudo-first-order rate constant was finally evaluated.

关键词： sodium dodecylsulfate hydroxyaluminosilicate montmorillonite metal ions adsorption Langmuir model kinetics

Selective Oxidation of n-Butane over VPO Catalyst Modified by Different Additives

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Journal of Natural Gas Chemistry 2005年第3期14卷 177-180页

作者： Hong Liang daiqi Ye School of Biological and Chemical Engineering Guangzhou University Guangzhou 510091 China School of Chemical Engineering South China University of Technology Guangzhou 510640 China

A series of vanadyl pyrophosphate catalyst （VPO） modified by different additives have been prepared with the aim to study the performance for selective conversion of n-butane to maleic anhydride（MA）. The addition of various promoters improved the catalytic performance remarkably on both activity and selectivity. The correlation of activity and selectivity of the catalysts with their structure has been discussed. The increase in BET surface areas and surface redox sites leads to an enhanced activity. However, good selectivity can only be obtained on those surfaces with suitable surface acid sites.

关键词： vanadyl pyrophosphate catalyst additives selective oxidation maleic anhydride

Allowance and allocation of industrial volatile organic compounds emission in China for year 2020 and 2030

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Journal of Environmental Sciences 2018年第7期30卷 155-165页

作者： Jiani Zhang Jingfang Xiao Xiaofang Chen Xiaoming Liang Liya Fan daiqi Ye School of Environment and Energy South China University of Technology Guangzhou 510006 China Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control Guangzhou 510006 China National Engineering Laboratory for VOCs Pollution Control Technology and Equipment South China University of TechnologyGuangzhou 510006 China

As an effective pollution control method, emission allowance and allocation just implemented in volatile organic compounds（VOCs） control strategy of China in 2016. This article presents a possible way to set the emission allowance targets and establishes an allowance allocation model for the object year, 2020 and 2030, using 2010 as the reference year. On the basis of regression and scenario analysis method, the emission allowance targets were designed,which were 17.902 Tg and 18.224 Tg for 2020 and 2030, with an increasing rate of 28.75% and31.06% compared to 2010. From the perspective of industries, processes using VOCscontaining products, like machinery and equipment manufacturing, would continue to be the most significant industrial VOCs emission sources in the future of China. Four allocation indicators were selected, which are per capita GDP of each province, per capita industrial VOCs emission of each province, the economic contribution of industrial sector to regional economy of each province, and the emission intensity per land area of each province, *** on information entropy, the weights of the indicators were calculated and an emission allocation model was established, and the results showed that provinces like Shandong,Jiangsu, Guangdong, Zhejiang and Fujian were calculated to obtain more emission allowance while burden more reduction responsibility. Meanwhile, provinces like Guizhou, Ningxia,Hainan, Qinghai and Xizang were on the contrary. This paper suggests governments to enhance or ease to industrial VOCs reduction burden of each province in order to stimulate its economy or change its way of economy development.

关键词： VOCs Allowance Allocation Industrial emission China