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Isolation and identification of bacteria responsible for simultaneous anaerobic ammonium and sulfate removal

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Science China Chemistry 2010年第3期53卷 644-649页

作者： cai, Jing jiang, jian Xiang Zheng, Ping Department of Environmental Engineering Zhejiang University Hangzhou 310029 China

Sulfate-dependent anaerobic ammonium oxidation is a novel biological reaction,in which ammonium is oxidized with sulfate as the electron acceptor under anoxic *** and sulfate are cosmopolitan chemical species which are an integral part of the global nitrogen and sulfur cycles.A detailed exploration of sulfate-dependent anaerobic ammonium oxidation is quite *** this work,a bacterial strain named ASR has been isolated from an anaerobic ammonia and sulfate removing reactor working under *** the basis of electron microscopy,physiological tests and 16S rDNA phylogenetic sequence analysis,the strain ASR is found to be related to Bacillus *** to the biological carbon source utilization test,the strain ASR could use many carbon *** optimum pH value and temperature were 8.5 and 30 °C,*** test proves that the strain ASR is able to use sulfate to oxidize ammonia *** maximum ammonia and sulfate removal rates were 44.4% and 40.0%,*** present study provided biological evidence for the confirmation and development of sulfate-dependent anaerobic ammonium oxidation and brought new insights into the global nitrogen and sulfur cycles.

关键词： bacillus ammonia sulfate isolation and identification

Synthesis and Crystal Structure of Chiral 4-Hydroxy-4-butyrolactam Fused Aziridine

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Chinese Journal of Structural Chemistry 2008年第2期27卷 133-136页

作者： WANG jian-Ping WANG jian-Ge FU Yong-Ju LI Ying-fei Department of Chemistry Luoyang Normal University Luoyang 471022 China Chemical Engineering ＆ Pharmaceutics College Henan University of Science and Technology Luoyang 471003 China

A novel compound of chiral 4-hydroxy-4-butyrolactam fused aziridine was synthesized via tandem nucleophilic displacement reaction under mild condition. Its structure was determined by IR, 1H NMR, elemental analysis and X-ray diffraction. The crystal of the new compound is of orthorhombic, space group P212121 with a = 6.4246（6）, b = 13.5081（13）, c = 18.6399（18） A, Mr = 278.39, Z = 4, V = 1617.6（3）A^3, Dc = 1.143 g/cm^3, p（MoKa） = 0.075 mm^-1, F（000） = 608, the final R = 0.0297 and wR = 0.0679.

关键词： butyrolactam aziridine asymmetric synthesis crystal structure

Analysis of dipole-like ultra high frequency RFID tags close to metallic surfaces

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第8期10卷 1217-1222页

作者： Ling-fei MO Hong-jian ZHANG Hong-liang ZHOU State Key Lab of Industrial Control Technology Department of Control Zhejiang University Hangzhou 310027 China

It is a challenge for passive RFID tags to be mounted on the surface of metal because the parameters of tag antennas,such as the impedance matching,the radiation efficiency and the radiation pattern,are seriously affected by the metallic *** paper presents the characteristics of the dipole-like antennas of ultra high frequency(UHF) radio frequency identification(RFID) tags that are placed close to metallic *** finite element method(FEM) and method of moment(MoM) were used to simulate the changes of the antenna parameters near the metallic *** typical dipole-like antennas close to the metallic surface,a closed loop antenna and a loaded meander antenna,were modeled,and the performance was *** was carried out and the results were in good agreement with the simulation,showing that a distance of 0.05λ～0.1λ(λ is the free space wavelength) from the metallic surface could make the dipole-like UHF RFID tag performance be acceptable.

关键词： Radio frequency identification (RFID) Tag Metallic surface Finite element method (FEM) Method of moment (MoM)

Subcapsular hepatic haematoma after endoscopic retrograde cholangiopancrea-tography: An unusual case

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World Journal of Gastroenterology 2013年第9期19卷 1502-1504页

作者： Bao-Ying fei cai-Hong Li Department of Gastroenterology Zhejiang Provincial People's Hospital

Subcapsular hepatic haematoma is a rare complication of endoscopic retrograde cholangiopancrea-tography (ERCP), and there are few reports about this unusual complication worldwide. The primary symptom of most cases reported in the literature is abdominal pain. We report an unusual case with the primary symptom of fever. A 56-year-old man who had a six-month history of recurrent episodes of upper abdominal pain was diagnosed with a common bile duct stone by magnetic resonance cholangiopancrea-tography. Endoscopic biliary sphincterotomy was performed, and stones from the common bile duct were successfully extracted with a basket. The patient had a persistent fever after ERCP, and treatment with intravenous antibiotics was unsuccessful. Computed tomography showed a 13 cm × 6 cm subcapsular hepatic haematoma filled with air and liquid on the surface of the right hepatic lobe. The patient was successfully treated with peritoneal drainage under B-ultra guidance. Subcapsular liver haematoma should be considered when hard-toexplain symptoms persist in the early period after ERCP. Percutaneous drainage is an effective treatment.

关键词： Endoscopic retrograde cholangiopancreatography Hepatic Hematoma Complication Treatment

A Totally(Δ+1)-colorable 1-planar Graph with Girth at Least Five

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Acta Mathematica Sinica,English Series 2016年第11期32卷 1337-1349页

作者： Lin SUN jian Liang WU Hua cai School of Mathematics Shandong University Ji'nan 250100 P. R. China Department of Mathematics Changji University Changji 831100 P. R. China

A graph is 1-planar if it can be drawn on the plane so that each edge is crossed by at most one other edge. In this paper, we prove that every 1-planar graph G with maximum degree △（G）〉 12 and girth at least five... 详细信息

关键词： 1-planar graph total coloring discharging method girth

Influence of mechanical damage generated by small space debris on electrostatic discharge

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Science China Earth Sciences 2016年第3期59卷 533-539页

作者： cai Ming Hui LI Hong Wei HAN jian Wei National Space Science Center Chinese Academy of Sciences

Recent studies have indicated that hypervelocity impacts by meteoroids and space debris can induce spacecraft anomalies. However, the basic physical process through which space debris impacts cause anomalies is not entirely clear. Currently, impact-generated plasma is thought to be the primary cause of electrical spacecraft anomalies, while the effects of impact-generated mechanical damage have rarely been researched. This paper presents new evidence showing that impact-generated mechanical damage strongly influences electrostatic discharge. Hypervelocity impact experiments were conducted in a plasma drag particle accelerator, using particles with diameters of 200–500 ?m and velocities of 2–7 km/s. The impact-generated mechanical damage on a specimen surface was measured by a stereoscopic microscope and 3D Profilometer and it indicated that microscopic irregularities around the impact crater could be responsible for local electric field enhancement. Furthermore, the influence of impact-generated mechanical damage on electrostatic discharge was simulated in an inverted potential gradient situation. The experimental results show that the electrostatic discharge voltage threshold was significantly reduced after the specimen was impacted by particles.

关键词： Electrostatic discharge Small space debris Inverted potential gradient Spacecraft charging

Comparison of various procedures for progressive collapse analysis of cable-stayed bridges

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第5期13卷 323-334页

作者： jian-guo cai Yi-xiang XU Li-ping ZHUANG jian FENG Jin ZHANG Key Laboratory of C&PC Structures of Ministry of Education Southeast University Nanjing 210096 China Department of Civil Engineering Strathclyde University Glasgow UK

Alternate path(AP) method is the most widely used method for the progressive collapse analysis,and its application in frame structures has been well ***,the application of AP method for other structures,especially for cable-stayed structures,should be further *** four analytical procedures,i.e.,linear static,nonlinear static,linear dynamic,and nonlinear dynamic were firstly improved by taking into account the initial *** a cable-stayed structure was studied using the four improved ***,the losses of both one cable and two cables were *** results show that for static and dynamic analyses of the cable-stayed bridges,there is large difference between the results obtained from simulations starting with either a deformed or a nondeformed configuration at the time of cable *** static results are conservative in the vicinity of the ruptured cable,but the dynamic effect of the cable loss in the area farther away from the loss-cable cannot be ***,the dynamic amplification factor of 2.0 is found to be a good estimate for static analysis procedures,since linear static and linear dynamic procedures yield approximately the same maximum vertical *** results of the comprehensive evaluation of the cable failure show that the tread of the progressive failure of the cable-stayed bridges decreases when the location of the failed cables is closer to the pylon.

关键词： Progressive failure Structural failures Collapse Linear analysis Nonlinear analysis Dynamic analysis Cable-stayed bridges

A DFT study on Pt single atom loaded COF for efficient photocatalytic CO_(2)reduction

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Journal of Materials Science & Technology 2024年第3期170卷 87-94页

作者： fei Xie Chuanbiao Bie jian Sun Zhenyi Zhang Bicheng Zhu Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan430078China Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission Key Laboratory of Photosensitive Materials and Devices of Liaoning ProvinceSchool of Physics and Materials EngineeringDalian Minzu UniversityDalian116600China

Photocatalytic CO_(2)reduction provides a promising strategy for the alleviation of greenhouse effect and energy shortage *** single atom modification is an effective method to improve the CO_(2)reduction performance of covalent organic framework(COF)photocatalysts,while the intrinsic mechanism is not revealed in ***,a Pt-COF photocatalytic system was constructed by embedding Pt single atom in TFPT-TMT-COF(TFPT:1,3,5-tris(4-formylphenyl)-triazine,TMT:2,4,6-trimethyl-1,3,5-triazine).Based on density functional theory(DFT)calculation,the geometric structure and electronic property of Pt-COF were investigated,and the CO_(2)adsorption and reduction reaction process on Pt-COF were *** results show that the Pt atom can be steadily anchored in COF via the formation of Pt-N and Pt-C ***,there is strong electronic interaction between Pt and *** incorporation of Pt atom benefits the CO_(2)reduction activity of COF from multiple aspects:(ⅰ)reducing the band gap and improving light absorption;(ⅱ)enhancing CO_(2)adsorption and activating the CO_(2)molecule;(ⅲ)decreasing the energy barrier in the hydrogenation step of CO_(2)→COOH,thus facilitating CO_(2)conversion to CO;(ⅳ)inhibiting the hydrogenation of CO,thereby increasing the selectivity of *** work brings a novel insight into the excellent CO_(2)reduction performance of Pt modified COF,and provides useful references for the design of single atom photocatalysts.

关键词： Photocatalysis Carbon dioxide reduction Covalent organic framework Pt single atom Theoretical calculation

Effects of soil dynamic response on post-earthquake deformation of slopes based on nested Newmark model

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Earthquake Engineering and Engineering Vibration 2020年第3期19卷 573-582页

作者： Zhou Zheng Gao Yufeng Zhang fei Song jian Zou Degao Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China The State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

Nested Newmark model(NNM)can obtain the post-earthquake profile of the slopes in limit equilibrium or limit analysis *** purpose of this study is to extend the NNM from the limit equilibrium method to a limit analysis method,and then involve the dynamic response of slopes into the prediction of the permanent displacement based on decoupled *** studies are carried out to further investigate the influences of slope height,soil shear wave velocity and input ground *** calculated results indicate that neglecting the dynamic response of slopes can underestimate the post-earthquake *** the slope height increases or shear wave velocity reduces,the underestimation is more *** the fundamental natural period of the site,the underestimation is particularly *** induced earthquake waves with a small value of mean period,the influence of the dynamic response can be ignored when the fundamental period deviates from the mean period.

关键词： soil dynamic limit