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| 1 | Sedimentary Features and Their Implications of Microdigital Stromatolites from the Mesoproterozoic Wumishan Formation at the Jixian Section in North China显示文摘在在天津的 Jixian 节的 Mesoproterozoic Wumishan 形成是一套超过 3000-m-thick stromatolitic 碳酸盐继任。在这继任,几个岩相单位,也就是说 subtidal stromatolitic biostrome, thrombolitic bioherm,潮汐公寓的 micritic 白云石和泻湖含白云石的页岩,当 Wumishan 骑车,完成被提名了的 peritidal 碳酸盐类型的许多米规模周期。重要地,许多 microdigital stromatolites 在 Wumishan 形成的更低的部分完成 Wumishan 周期的 stromatolitic biostrome 单位。这些 microdigital stromatolites 被古生物学家作为一个 stromatolitic 集合组织了,也就是说 Pseudogymnosolen mopanyuensis-Scuphus-Yangzhuang columnaris 集合。当霰石(石灰华) 海地板由 sedimentologists 猛抛,这些 microdigital stromatolites 也被解释了,并且进一步从海地板霰石作为过渡时期的特殊产品被认为猛抛对 Neoproterozoic 的碎屑状、泥泞的碳酸盐太古代。尽管为 stromatolitic 集合的概念的 stratigraphic 意思有一些限制,由古生物学家的分类上的详细研究提供重要线索理解 microdigital stromatolites 的 sedimentological 意思。而且,为 microdigital stromatolites 的结束的一根重要、明显的地平线在 Jixian 节在 Mesoproterozoic Wumishan 形成被记录,它提供有用信息理解 stromatolite 衰落发生在 c.1250 妈和演变碳酸盐世界前寒武纪。 | MEI Mingxiang GAO Jinhan MENG Qingfen LIU Zhirong | 2010 | Acta Geologica Sinica(English Edition)2010，84，3： | 8 |
| 2 | Extraction of penicillin G by aqueous two-phase system of [Bmim]BF_(4)/NaH_(2)PO_(4)显示文摘A novel approach for the extraction of penicil-lin G by aqueous two-phase system comprised of hydrophilic ionic liquid [Bmim]BF4 (1-butyl-3- methylimidazolium tetra-fluoroborate) and NaH2PO4 is reported. The effects of some important parameters involving the concentration of NaH2PO4, the concentration of penicillin G, the amount of [Bmim]BF4 on the formation of aqueous two-phase system and the extraction yield of penicillin were investigated. The primary result shows that the ATPS can take advantage of penicillin concentrated in upper phase at higher pH value for penicillin extraction from its aqueous solution without emul-sification. | LIU Qingfen HU Xuesheng WANG Yuhong YANG Ping XIA Hansong YU Jiang LIU Huizhou | 2005 | Chinese Science Bulletin2005，50，15： | 6 |
| 3 | Linear dynamic system method for tactile object classification显示文摘Lots of tactile sequences can be obtained by using a dexterous hand for grasping different objects.The ability of robotic environmental perception and dexterous manipulation will be significantly improved after these tactile sequences are correctly classified.Therefore,tactile sequences are separated into series of subgroups,and a method based on linear dynamical system(LDS)is used to extract features.Since these LDSs lie in nonEuclidean space,the Martin distance,which is a measurement different from Euclidean distance,is applied to calculate the distance between two LDSs,and the K-Medoid algorithm is used for clustering.The codebook is obtained after clustering and is used to represent time sequences to get a Bag-of-System(Bo S).Then the Bo S and labels are sent to Extreme Learning Machine(ELM)to train a classifier.Finally,three databases,KTH-7,KTH-10 and TSH-8 are used to evaluate our algorithm. | MA Rui LIU HuaPing SUN FuChun YANG QingFen GAO Meng | 2014 | Science China(Information Sciences)2014，57，12： | 3 |
| 4 | Selection of adsorbents for in-situ coupling technology of adsorptive desulfurization and biodesulfurization显示文摘In-situ coupling of adsorptive desulfurization and biodesulfurization is a new desulfurization technol- ogy for fossil oil. It has the merits of high-selectivity of biodesulfurization and high-rate of adsorptive desulfurization. It is carried out by assembling nano-adsorbents onto surfaces of microbial cells. In this work, In-situ coupling desulfurization technology of widely used desulfurization adsorbents of γ-Al2O3, Na-Y molecular sieves, and active carbon with Pseudomonas delafieldii R-8 were studied. Results show that Na-Y molecular sieves restrain the activity of R-8 cells and active carbon cannot desorb the sub- strate dibenzothiophene (DBT). Thus, they are not applicable to in-situ coupling desulfurization tech- nology. Gamma-Al2O3 can adsorb DBT from oil phase quickly, and then desorb it and transfer it to R-8 cells for biodegradation, thus increasing desulfurization rate. It is also found that nano-sized γ-Al2O3 increases desulfurization rate more than regular-sized γ-Al2O3. Therefore, nano- γ-Al2O3 is regarded as the better adsorbent for this in-situ coupling desulfurization technology. | ZHANG HuaiYing LIU QingFen LI YuGuang LI WangLiang XIONG XiaoChao XING JianMin LIU HuiZhou | 2008 | Science China Chemistry2008，51，1： | 2 |
| 5 | Uncoupling protein 1 mRNA, mitoehondrial GTP-binding, and T4 5'-deiodinase of brown adipose tissue in euthermic Daurian ground squirrel during cold exposure显示文摘 | LIU Xiaotuan LI Qingfen LIN Qishui | 2001 | Comp Biochem Physiol A2001，128，4： | 1 |
| 6 | Corrosion behaviors in physiological solution of cerium conversion coatings on AZ31 magnesium alloy显示文摘 | Xiufang Cui Yuyun Yang Erbao Liu Guo Jin Jinggao Zhong Qingfen Li | 2011 | Applied Surface Science2011，，23： | 1 |
| 7 | Physical ori- gin of large positive and negative lateral optical beam shifts in prism-waveguide coupling system 显示文摘 | Liu Xiangmin Yang Qingfen Qiao Zhi | 2010 | Opt Comm2010，283，13： | 1 |
| 8 | Physical origin of large positive and negative lateral optical beam shifts in prism-waveguide coupling system 显示文摘 | Liu Xiangmin Yang Qingfen Qiao Zhi | 2010 | Opt Comm2010，283，13： | 1 |
| 9 | Corrosion behaviors in physiological solution of cerium conversion coatings on AZ31 magnesium alloy显示文摘 | Xiufang Cui Yuyun Yang Erbao Liu Guo Jin Jinggao Zhong Qingfen Li | 2011 | Applied Surface Science2011，，23： | 1 |
| 10 | Temper embrittlement dynamics induced by non-equilibrium segregation of phosphorus in steel 12Cr1MoV显示文摘 | Li Qingfen Li Li Liu Erbao | 2005 | Scripta Materialia2005，53，3： | 1 |
| 11 | Dissolution of antibiotics mycelium in ionic liquids:Performance and mechanism显示文摘Antibiotics mycelium, byproduct of pharmaceutical industry, contains high percentage of proteins, polysaccharides and lipids, while, the low solubility in traditional solvents limits its utilization. The dissolution process of penicillin mycelium was investigated using ionic liquids(ILs) as solvent. Quantitative correlation of solubility and ILs structure and dissolution mechanism were determined. About 91.45% of penicillin mycelium was dissolved in 1-butyl-3-methylimidazolium acetate([Bmim]Ac) under the condition of 120.0 ℃ and [Bmim]Ac/mycelium(m/m) ratio of 3.90:1. Synergistic effect of ILs and DMSO was confirmed with the DMSO/[Bmim]Ac(v/m) ratio in the range of 0.0-1.0. At 25.0 ℃, the dissolution of penicillin mycelium increased from 69.74% to94.50%, with the ratio of DMSO to [Bmim]Ac(v/m) as 1:1. The room temperature dissolution of mycelium provides a novel and energy-saving process for its high-valued utilization. The NMR and FT-IR spectra showed that hydrogen bonds are the dominant driving force for the dissolution in ILs. Quantitative study on the effects of anions and cations of ILs on dissolution using Kamlet-Taft model showed that there was a linearly positive correlation between solubility of penicillin mycelium and(3 parameter of the ILs. The solubility of mycelium increased with increasing hydrogen bond accepting ability of anions and donating ability of cations. | Jierong Yang Wangliang Li Qingfen Liu Huizhou Liu | 2018 | Chinese Journal of Chemical Engineering2018，26，2： | 1 |
| 12 | Finite element analysis and shape optimization of automotive crash-box subjected to low velocity impact显示文摘 | Li Qingfen Liu Yanjie Wang Haidou | 2009 | measuring technology and mechatronics automation2009，，： | 1 |
| 13 | The influence of Goos-Hanchen shift on total re- flection of ultrashort light pulses 显示文摘 | Liu Xiangmin Yang Qingfen Zhu Pengfei Qiao Zhi Li Tongkai | 2010 | J Opt2010，12，03： | 1 |
| 14 | Adsorptive desulfurization of diesel with mesoporous aluminosilicates显示文摘Mesoporous aluminosilicates (MAS) bearing microporous zeolite units and mesoporous structures were synthesized by the hydrothermal method. Adsorptive desulfurization ability of model oil and hy-drotreated diesel was studied. The effects of template concentration, crystalization time and calcination time were investigated. The desulfurization ability of adsorbents was improved by transitional metal ion-exchanging. The adsorptive desulfurization of diesel was carried out on a fixed-bed system. The results show that the adsorptive capacity is MAS>MCM-41>NaY. The improvement of desulfurization ability of MAS by Cu+ is more significant than that of Ag+. | TANG Huang LI WangLiang LIU QingFen GUAN LiLi SONG JiaQing XING JianMin LIU HuiZhou | 2009 | Science China Chemistry2009，52，3： | 0 |
| 15 | Clean Separation Process of Chabocuo Saline Lake in Tibet显示文摘1 Introduction Chabocuo Lake is located in the territory of Gaize County Ali area Tibet,the altitude of the lake-surface is4505 m with a total area of 32 Km2.It is a typical sulfate type saline and rich in boron and lithium.In the natural evaporation process,several mineral sylvites cocrystallize out,thus increases the difficulties for separating | MENG Qingfen TANG Zhi LIU Tuo YU Shengmin GAO Dandan DONG Yaping LI Wu | 2014 | Acta Geologica Sinica(English Edition)2014，88，S1： | 0 |
| 16 | Stability of penicillin G in ionic liquid [Bmim]PF_6显示文摘The extraction of penicillin G by ionic liquid[Bmim]PF_6 has exhibited promising prospect.The stability of penicillin G is crucial for developing a green ionic liquid-based extraction technology.In this work,the stability of penicillin G in[Bmim]PF_6 was systematically investigated.The results showed the stability of penicillin G was significantly influenced by pH and temperature.It tended to be more stable when pH value increased from 1.5 to 4.0 and the temperature gradually decreased.The half-life(t_(1/2))of penicillin G in[Bmim]PF_6 was 17.7 h in the optimal technological condition(pH 2.0 and 10°C),which is enough for the requirement of extraction technology.The reaction of penicillin G in[Bmim]PF_6 followed the first order kinetics in the pH range 2.0–4.0.Three isomers of penicillin G were found through rearrangement at pH 2.0,and their structures were not affected by temperature. | Jingxian Qi Qingfen Liu Huizhou Liu | 2018 | Chinese Journal of Chemical Engineering2018，26，6： | 0 |
| 17 | Gas-assisted magnetic separation for the purification of proteins in batch systems显示文摘 | Zhini Liu Liangrong Yang Tingting Dong Wensong Li Xitong Sun Menghao Zhu Zhengkang Duan Qingfen Liu Huizhou Liu | 2016 | Particuology2016，14，1： | 0 |
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