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Search Results: 1 - 10 of 363099 matches for " <br>任晓光 "
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Excavation of Web Knowledge Association Based on Bipartite Graph

Ren Hui Zhou Xiaoguang Shen Jin,<br>,,
现代图书情报技术 , 2007,
Abstract: 二部图法分析模型是将Web页的内容信息和超链接信息相结合给出的一种基于分类方法的算法,利用二部图可以求出网页的最大匹配与完全匹配,挖掘出隐含的知识社群,能更准确地实现对用户的合理定位。
Properties of hexaaluminate catalysts and catalytic reduction activity for desulfurization and denitrification

Ren Xiaoguang,Zhu Xudong,Li Fuxia,<br>,朱旭东,李富霞
环境工程学报 , 2013,
Abstract: 采用共沉淀法制备Cu和Fe掺杂的六铝酸盐催化剂(SrCuxFe1-xAl11O19-δ,x为0,0.2,0.4,0.5,0.6,0.8,1),通过XRD、TPR、BET等技术方法对催化剂的结构及性质进行了研究,并考察了以CO为还原剂的催化脱硝活性。结果表明,用碳酸铵作为沉淀剂在1 200℃焙烧4 h可以形成完整的六铝酸盐晶型,Cu和Fe能够取代Al3+,很好地促进六铝酸盐晶体结构的形成;SrCuxFe1-xAl11O19-δ催化剂有很好的脱硫脱硝催化活性,此类型的催化剂均使SO2、NO的转化率在空速为6 000 h-1下达到了80%和90%以上。向体系中加入氧气会对催化活性有较大影响。
Path planning based on model predictive control algorithm under moving threat

REN Jia,GAO Xiao-guang,ZHANG Yan,<br>,,张艳
控制理论与应用 , 2010,
Abstract: Combining with the prediction of fast moving threat, the model predictive control(MPC) algorithm is adopted in the dynamic path planning for uninhabited air vehicles(UAVs). By using the converted measurement Kalman filter(CMKF) algorithm, the states of moving targets are predicted, and then the threats against UAV are evaluated, together with the length of path, to establish the cost function. The path planning is accomplished by obtaining a series of on-line control values which are figured out by minimizing the cost function in receding horizon. Finally, the application efficiency of MPC in path planning is validated by the simulation results.
Purification and Some Properties of Bacteriolytic Enzyme R1 from Streptomyces griseus RX-17

Xin Zhao,Guangwen Ren,Xiaoping Tu,Yuzhen Zhang,<br>赵昕,,,张玉臻
微生物学报 , 2003,
Abstract: Bacteriolytic enzyme R1 was purified to electrophoretic homogeneity with the recovery of 6.89% activity by ammonium sulfate precipitation, CM-Sephadex C - 50, CM-Sepharose Fast Flow and Sephadex G-75 chromatography from the culture supernatant of Streptomyces griseus RX-17. The molecular weight and PI of R1 were 16.8 kD and 9.10. The optimal temperature and pH for R1 against Streptococcus mutans Ingbritt were 70 degrees C and 6.6, respectively. Below 50 degrees C and at range pH 6 - 10, R1 was stable. While treated at 60 degrees C for 1 hour, the residual activity was only about 20.3%. Zn2+, Cu2+, Fe2+, Cd2+ and Pb2+ could completely inactivate the enzyme. Chelating agents, hydroxylamine hydrochloriae, Monoiodoacetic acid inhibited the lytic activity against Streptococcus mutans Ingbritt, whereas Mg2+, 2-Mercaptoethanol and some surfactants could stimulate the activity. The enzyme had a broad bacteriolytic spectrum against many G+, G- bacteria which were resistant to egg-white lysozyme. Especially high activity was shown on Streptococcus mutans, Staphylococcus aureus and Lactobaillus.
电化学 , 2012,
Abstract: 配置原油模拟液,研究了二乙基二硫代氨基甲酸钠(SDDTC)于模拟液中单独使用及其分别与硫酸锌,铬酸钠的复配对316L钢的缓蚀效果。实验表明:在高酸高氯环境下SDDTC能够很好的抑制316L钢的腐蚀;而且SDDTC与硫酸锌,铬酸钠之复配缓蚀剂具有很好的协同增效作用,这一切相关研究具有重要的实际应用意义。
Process for Separation of Naphthenic Acids from High TAN Heavy Crude Oil of Sudan

REN Xiao-guang,QI Liang,SONG Yong-ji,REN Shao-mei,<br>,齐亮,宋永吉,绍梅
过程工程学报 , 2004,
Abstract: 采用醇、胺等复合溶剂,对高酸值原油中的环烷酸进行抽提,详细讨论了抽提温度、搅拌速度、相分离时间及反应时间等因素对脱酸的影响.实验结果表明,该方法有效地克服了乳化现象严重的缺点,经复合溶剂抽提,一次脱酸率可达70%以上.
Composition and Distribution of Naphthenic Acids in Crude Oil of High Acid Value

REN Xiao-guang,SONG Yong-ji,REN Shao-mei,QI Liang,<br>,宋永吉,绍梅,齐亮
过程工程学报 , 2003,
Abstract: The paper analyzes naphthenic acids distribution in fraction oil of the crude oil from a well named Fula-North-3B in an oilfield situated in the north of the Republic of Sudan. Some relative items and properties of the crude oil or its distillates are also determined. This work can provide some basic data, not only for further study on this kind of crude oil, but also for processing and utilizing naphthenic acids.
Structure and denitrification behaviors of Fe2O3-Cr2O3/TiO2 catalysts

Ren Xiaoguang,Ren Chao,Li Fuxi,Li Peng,Song Yongji,<br>,,李富霞,李鹏,宋永吉
环境工程学报 , 2012,
Abstract: 研究以纳米TiO2为载体,浸渍负载过渡金属氧化物,以CO为还原剂的脱硝催化剂的脱硝性能。实验中以计算量的Ni(NO3)2和Fe(NO3)3混合溶液浸渍纳米TiO2粉末,室温下搅拌30 min至混合均匀,放入旋转蒸发器中,70℃下至水分蒸干为止;所得粉末在550℃下、空气气氛中焙烧4 h即得所需催化剂。用以上方法分别制备2%Fe2O3-10%Cr2O3/TiO2、4%Fe2O3-8%Cr2O3/TiO2、6%Fe2O3-6%Cr2O3/TiO2、8%Fe2O3-4%Cr2O3/TiO2与10%Fe2O3-2%Cr2O3/TiO2等5种催化剂样品。实验结果表明,制备的催化剂具有较好的结构,分散较为均匀。对于CO+NO反应,Fe2O3-Cr2O3/TiO2系列催化剂具有较好的催化活性,NO的转化率都达到了100%。其中,10%Fe2O3-2%Cr2O3/TiO2样品具有最好的低温活性,H2-TPR结果表明,这是由于10%Fe2O3-2%Cr2O3/TiO2催化剂更易于被CO预还原。
Denitrification performance of Cu and Ce doped hexaaluminate catalysts

Ren Xiaoguang,Wang Xiaoying,Li Fuxi,Li Peng,Song Yongji,<br>,,李富霞,李鹏,宋永吉
环境工程学报 , 2013,
Abstract: Hexaaluminate catalysts LaMxAl12-xO19 (M=Cu, Ce, CuCe) for NO removal were prepared by the co-precipitation method. The catalysts were characterized by the means of XRD, H2-TPR and BET. The catalyst efficiency for selective catalytic reduction of NO by CO was evaluated in a catalytic microreactor. The results show that Cu ions can easily enter the hexaaluminate crystal lattice to form a good hexaaluminate phase. Ce ions are hard to enter hexaaluminate skeleton, exist mainly in the form of CeO2. Under the condition of CO+NO, all of the three catalysts have a good denitrification activity. Due to the synergistic effect between Cu ions and Ce ions, catalyst LaCuCeAl10O19 has a better denitrification activity. With the introduction of SO2, the denitrification activities of all the three catalysts decline to different levels. Catalyst LaCuAl11O19 is poisoned by SO2 most seriously, while catalyst LaCuCeAl10O19 has the best denitrification activity among them.
Photolysis of novel insecticide HNPC-A9908 in organic solvents under the irradiation of ultraviolet light

OU Xiaoming,REN Jing,LEI Manxiang,WANG Xiaoguang,FAN Defang,<br>欧,,雷满香,,樊德方
环境科学学报 , 2005,
Abstract: 以紫外灯为光源,对硫肟醚在甲醇、丙酮、正己烷和二甲苯等有机溶剂中的光解反应动力学及降解机理进行了初步研究.结果表明,硫肟醚在4种有机溶剂中的紫外光解反应符合一级动力学规律,在4种溶剂中反应速率常数分别为1·14×10-1(正己烷)、8·90×10-2(甲醇)、2·46×10-2(二甲苯)和4·51×10-3min-1(丙酮),硫肟醚的降解半衰期分别为6·08,7·79,28·18和153·86min.通过对硫肟醚光解产物进行分离和LC-MS鉴定,初步推出在紫外光辐射下硫肟醚在有机溶剂中的降解主要涉及到硫肟醚分子的肟醚键(CNOC)断裂、甲硫键(C—S—CH3)光氧化、脱氯反应和光异构化作用等途径.
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