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| 1 | Synthesis and Luminescence of SrZnO_2∶Eu^(3+), Li^+ Phosphor by Long Wavelength UV Excitation显示文摘SrZnO2∶Eu 3+, Li+ phosphor powder by long wavelength UV excitation was synthesized by conventional solid-state reaction method. XRD and PL were employed to characterize their properties. The results show that Eu 3+ ions preferentially occupy Sr 2+ asymmetry cationic sites, thus emitting 612 nm red light originated from 5D0 to 7F2 transition. The luminescent intensity can be greatly enhanced with incorporation of Li+ ions. The excitation efficiency in range of 350~400 nm also increases greatly due to incorporating Li+ ions. SrZnO2∶Eu 3+, Li+ is a promising red-emitting phosphor by long wavelength UV excitation. | Yu Xibin Yang Liangzhun Yang Shiping Zhou Chunlei Xu Xiaolin Tang Jingfen Peng Xiudong | 2005 | Journal of Rare Earths2005，23，5： | 7 |
| 2 | Toxic effects of chlortetracycline on maize growth,reactive oxygen species generation and the antioxidant response显示文摘The toxicity of chlortetracycline (CTC) on maize (Zea mays L.) growth and reactive oxygen species (ROS) generation was studied.The root and shoot lengths and fresh weights of maize seedlings were inhibited by CTC treatment (p < 0.05).Root length was more sensitive than other parameters with the EC 10 value of 0.064 mg/L.The spin trapping technique followed by electron paramagnetic resonance (EPR) analysis was used to quantify the ROS production.The ROS generated in maize roots after exposure to CTC was identified as hydroxyl radical (·OH).The EPR signal intensity correlated positively with the logarithm of CTC concentrations exposed (p < 0.05).The dynamic changes of malondialdehyde (MDA) contents and the antioxidative enzyme activities in maize roots were also determined.As compared to the control group,CTC was found to significantly increase MDA content.Treatment of maize roots with the ·OH scavenger sodium benzoate (SB) reduced the MDA content and enhanced the antioxidative enzyme activities.The results demonstrated the harmfulness of CTC at high dose to maize in the early developmental stage,and clarified that the inducement of ·OH is one of the mechanisms of CTC toxicity. | Bei Wen Yu Liu Peng Wang Tong WU Shuzhen Zhang Xiaoquan Shan Jingfen Lu | 2012 | Journal of Environmental Sciences2012，24，6： | 6 |
| 3 | Comparison of different cooling methods for extending shelf life of postharvest broccoli显示文摘This study aimed to investigate and compare the effects of vacuum cooling,cooling water and cold room methods on the shelf life of broccoli.The experiments were divided into four groups:vacuum cooling(A),ice-water cooling(B),cold room cooling(C)and control.The cooling rate and changes of weight loss,respiratory rate,chlorophyll,vitamin C,reducing sugar content and sensory properties were measured at intervals of five days.The results indicated that vacuum cooling was the most effective method for extending the shelf life of postharvest broccoli in terms of cooling rate,respiration rate,chlorophyll,vitamin C,reducing sugar and sensory properties.Moreover,spraying the broccoli with water during the vacuum cooling process resulted in a significant reduction in weight compared with the other two cooling methods and did not reduce the quality of the broccoli.Consequently,vacuum cooling treatment can be applied to broccoli after harvest in the field to maintain quality during transportation and storage.Additionally,the application of water spraying during vacuum cooling can considerably reduce the negative influence caused by vacuum cooling. | Ding Tian Liu Fen Ling Jiangang Kang Mengli Yu Jingfen Ye Xingqian Liu DongHong | 2016 | International Journal of Agricultural and Biological Engineering2016，9，6： | 5 |
| 4 | EXTRACTION KINETICS,SYNERGISTIC EFFECTS AND INTERFACIAL CHEMISTRY FOR D_2 EHPA MPA-Fe^(3+) MIXED EXTRACTION SYSTEM显示文摘The thermodynamics of micella formation,interfacial characteristics,synergistic effectsand interfacial kinetics for synergistic extraction system D2 EHPA-MPA-Fe3+ have beenstudied.It was found that D2EHPA in the mixed system strongly exhibits the effect onthe micella formation thermodynamics and interracial characteristics of MPA.Some ther-modynamic parameters for constants of micelles formation(Km).free energies of micellesformation(ΔGm)and critical micella concentrations(CMC)were obtained.The inter-facial adsorption behaviour of D2EHPA is opposite to that of MPA.The emulsificationfor single MPA and the mixed system was discussed.The synergistic effects were foundin this mixed extraction system.It is proved that the process of the Fe3+ extractionfor non-mixed extraction system is controlled by chemical reaction and the controllingreaction occurs at the interface. | YU Jingfen LIU Difei Tsinghua University,Beijing,China professor,Dept.of Chemical Engineering,Tsinghua University,Beijing 100084,China | 1993 | Acta Metallurgica Sinica(English Letters)1993，6，12： | 0 |
| 5 | DOUBLE SYNERGISTIC EFFECTS AND EXTRACTION KINETICS OF A MICELLE MIXED EXTRACTANT SYSTEM I DOUBLE(KINETIC AND THERMODYNAMIC)SYNERGISTIC EFFECTS AND EXTRACTION MECHANISMS显示文摘The equilibria and kinetic characteristics of a micelle mixed extractant system-D2 EHPA-MPA(MPA-monoalkyl phosphoric acid with long carbon chain and micellization)in extractionof the Al3+ions were studied.It was found that the system has double synergistic effects on theextraction of the Al3+ions.The compositions of the synergistic complexes were determined andthe synergistic reaction equations were obtained. | Yu,Jingfen Huang,Ting Department of Chemical Engineering,Qinghua University,Beijing 100084,China | 1993 | 中国有色金属学会会刊:英文版1993，3，4： | 0 |
| 6 | Phylogeny of SARS-CoV as inferred from complete genome comparison显示文摘SARS-CoV, as the pathogeny of severe acute respiratory syndrome (SARS), is a mystery that the origin of the virus is still unknown even a few isolates of the virus were completely sequenced. To explore the genesis of SARS-CoV, the FDOD method previously developed by us was applied to comparing complete genomes from 12 SARS-CoV isolates to those from 12 previously identified coronaviruses and an unrooted phylogenetic tree was constructed. Our results show that all SARS-CoV isolates were clustered into a clique and previously identified coronaviruses formed the other clique. Meanwhile, the three groups of coronaviruses depart from each other clearly in our tree that is consistent with the results of prevenient papers. Differently, from the topology of the phylogenetic tree we found that SARS-CoV is more close to group 1 within genus coronavirus. The topology map also shows that the 12 SARS-CoV isolates may be divided into two groups determined by the association with the SARS-CoV from the Hotel M in Hong Kong that may give some information about the infectious relationship of the SARS. | QI Zhen HU Yu LI Wei CHEN Yanjun ZHANG Zhihua SUN Shiwei LU Hongchao ZHANG Jingfen BU Dongbo LING Lunjiang CHEN Runsheng | 2003 | Chinese Science Bulletin2003，48，12： | 0 |
| 7 | EXTRACTION KINEIICS,MICELLIZATION AND INTERFACIAL CHARACTERISTICS OF A NEW EXTRACTANT SYSTEM显示文摘The interfacial kinetics,micellization and interfacial characteristics of the synergetic extrac-tion system,D2EHPA-H2RPA-Al3+,have been studied.H2RPA is a single long chain alkylphosphate.We have found that H2RPA in the mixed extractant system strongly exhibits thecharacteristics of micellization and interfacial activity.As the concentration of D2EHPA in-creases,the micellization and interracial activity of H2RPA decrease.The interfacialadsorption behaviour of H2RPA is opposite to that of D2EHPA.It was proved that the kine-tics of non-micella mixed extraction system was controlled by the chemical reaction at inter-face,and the reaction rate equation was obtained.This non-micella mixed extraction systemis expected to be used in the future. | YU Jingfen JI Chen PAN Xiaomei XIONG Yigang Tsinghua University,Beijing,China | 1991 | Acta Metallurgica Sinica(English Letters)1991，4，9： | 0 |
| 8 | Interfacial Characters of Organophosphoric and Phosphonic Acid Extraction Systems显示文摘Dynamic interracial characters are investigated for solvent extraction system of metals by organophosphoric or phosphonicacid.The relationship between interfacial characters and kinetic parameters shows that the dynamic interfacial properties are im-portant to mass transfer processes in liquid-liquid extraction.The authors develop a two-film adsorption model,which may offera basis for researching interfacial activity in mass transfer process. | Yu, Qiang Yu, Jingfen Lu, Jiufang Teng, Teng | 1989 | Rare Metals1989，9，2： | 0 |
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