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Heptanuclear brucite disk with cyanide bridges in a cocrystal and tracking its pyrolysis to an efficient oxygen evolution electrode

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Science Bulletin 2019年第22期64卷 1667-1674页

作者： Jian-Qiang Zhao Dandan Cai jun dai Mohamedally Kurmoo Xu Peng Ming-Hua Zeng Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources Department of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004China Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional MoleculesCollege of Chemistry and Chemical EngineeringHubei UniversityWuhan 430062China Institut de Chimie de Strasbourg CNRS-UMR7177Universite de Strasbourg67070 Strasbourg CedexFrance

The development of efficient oxygen evolution reaction(OER)catalysts is still lacking in exploration of the mechanism of controlled pyrolysis of precursors among new material ***,a novel Co-based coordination molecular cluster has been first introduced as precursor to obtain metallic cobalt core shelled by N-doped carbon(Co@NC)structure which operates as an oxygen evolution ***,a new cocrystal compound,[Co7II(l3-CN)6(mmimp)6][CoIICl3N(CN)2]á3CH3OH(Co7+1,mmimp=2-methoxy-6-((methylimino)-methyl)phenol),was isolated consisting of Brucite disks of cobalt where the usual bridging l3-OH is replaced by l3-CN produced by the in-situ decomposition of dicyanamide(NC-N-CNà).The cobalt atoms are bonded through the nitrogen atom of the ***,time dependent thermogravimetric-mass spectrometry(TG-MS)analysis was utilized to track its pyrolysis *** allowed us to propose a possible formation process of the Co@NC structure from Co7+***,an extremely superior OER electrode is optimized for Co@NC-600 having the lowest overpotential of257 m V at 10 m A/cm2in 1 mol/L KOH *** present study pins down the importance of clusters of transition metals on realizing distinct nanostructures operating as highly efficient OER electrocatalyst.

关键词： Cobalt disk clusters Thermogravimetry-mass spectrometry Pyrolysis tracking Core-shell nanostructure Oxygen evolution reaction

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Decomposition reaction of phosphate rock under the action of microwave plasma

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Chinese Physics B 2021年第4期30卷 361-368页

作者： Hui Zheng Meng Yang Cheng-Fa Jiang dai-jun Liu Department of Chemical Engineering Sichuan UniversityChengdu 610065China

The decomposition reaction of phosphate rock under the action of microwave plasma was *** rock and its decomposition products were characterized by x-ray diffraction(XRD),energy disperse spectroscopy(EDS),and chemical *** measurements of electron temperature(T_(e)) and electron density(N_(e)) of plasma plume under atmospheric pressure were carried out using optical emission spectroscopy(OES).The electron temperature(T_(e)) was determined based on the calculation of the relative intensity of the O Ⅱ(301.91 nm) and O Ⅱ(347.49 nm) spectral ***,electron densities were obtained using the Saha ionization equation which was based on the C Ⅰ(247.86 nm) line and the C Ⅱ(296.62 nm) line under the assumption of local thermodynamic equilibrium(LTE).The relationship between the relative intensity of the active components and the gas output was studied by the *** the reaction mechanism of the decomposition of the phosphate rock under the action of the atmospheric pressure microwave plasma was *** results showed that with the increase of CO flow and microwave power,the electron temperature and electron density in the plasma show a decreasing and increasing *** CO is dissociated into gaseous carbon ions under the action of microwave plasma,and the presence of gaseous carbon ions promotes the decomposition of the phosphate rock.

关键词： microwave plasma phosphorus decomposition optical emission spectroscopy reaction mechanism

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Topology evolutions of silhouettes

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第10期8卷 1671-1680页

作者： dai jun-fei KIM junho ZENG Hua-yi GU Xian-feng YAU Shing-tung Center of Mathematical Sciences Zhejiang University Hangzhou 310027 China Visualization Laboratory State University of New York Stony Brook NY 11794 USA Department of Mathematics Harvard University Boston MA02138 USA

We give the topology changing of the silhouette in 3D space while others study the projections in an image. Silhou- ettes play a crucial role in visualization, graphics and vision. This work focuses on the global behaviors of silhouettes, especially their topological evolutions, such as splitting, merging, appearing and disappearing. The dynamics of silhouettes are governed by the topology, the curvature of the surface, and the view point. In this paper, we work on a more theoretical level to give enu- merative properties of the silhouette including: the integration of signed geodesic curvature along a silhouette is equal to the view cone angle; in elliptic regions, no silhouette can be contained in another one; in hyperbolic regions, if a silhouette is homotopic to a point, then it has at least 4 cusps; finally, critical events can only happen when the view point is on the aspect surfaces (ruled surface of the asymptotic lines of parabolic points with surface itself). We also introduce a method to visualize the evolution of silhouettes, especially all the critical events where the topologies of the silhouettes change. The results have broad applications in computer vision for recognition, graphics for rendering and visualization.

关键词： Topological change Silhouette Geodesic curvature Cusp

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A survey on porcine circovirus type 2 infection and phylogenetic analysis of its ORF2 gene in Hangzhou,Zhejiang Province,China

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第2期9卷 148-153页

作者： Zong-zhao YANG Jiang-bing SHUAI Xian-jun dai Wei-huan FANG Institute of Preventive Veterinary Medicine Zhejiang University Hangzhou 310029 China Hangzhou Husbandry and Veterinary Station Hangzhou 310020 China College of Life Science China Jiliang University Hangzhou 310018 China

Porcine circovirus type 2 (PCV2) is closely related to the postweaning multisystemic wasting syndrome (PMWS). In this study, the pig serum and tissue samples collected from different regions of Hangzhou District in Zhejiang Province of China between 2003 and 2005 were analyzed by enzyme-linked immunosorbent assay (ELISA) for PCV2 antibody and by polymerase chain reaction (PCR) for ORF2 gene. The results show that out of 1250 randomly collected serum samples, 500 sera (40%) were seropositive for PCV2. PCR results demonstrate that Hangzhou PCV2 with more than 50% Chinese PCV2 strains and French PCV2 formed Cluster A. Only one PCV2 from Hangzhou belonged to Cluster B with some other Chinese PCV2 and Netherlands’s isolates. Cluster C consisted of PCV2 isolates from China, US, Canada, UK and Germany. The results indicate that the PCV2 infection was widespread in Hangzhou.

关键词： Porcine circovirus type 2 (PCV2) Seroprevalence ORF2 Phylogenetic analysis

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A novel hydrophilic polystyrene-based beads for hydrophilic interaction chromatography by surface-initiated atom transfer radical polymerization

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Chinese Chemical Letters 2011年第2期22卷 245-248页

作者： Xiao jun dai Yuan He Yin Mao Wei Bo Lin Gong Key Laboratory of Synthetic and Natural Function Molecule Chemistry of Ministry of Education College of Chemistry & Material Science Northwest University Xi'an 710069 China Key Laboratory of Energy & Chemical Engineering Ningxia University Yinchuan 750021 China Received 4 June 2010

A one-step procedure to hydrophilize monodisperse poly（chloromethyl-styrene-co-divinylbenzene） beads has been presented with 2-hydroxy-3-[4-（hydroxymethyl）-1H-1,2,3-triazol-1-yl]propy1 2-methylacrylate（HTMA） as monomer by surface-initiated atom transfer radical polymerization（SI-ATRP）.The length of the grafted poly（HTMA） chain was varied via controlling the ratio of HTMA to initiator on the surface of the *** these grafted beads as the stationary phase in hydrophilic interaction chromatography,good separation was obtained for nucleosides in the mobile phase of *** was also found that the retention time and selectivity of solutes showed a positive relationship with the length of the grafted poly（HTMA） chain.

关键词： Hydrophilic interaction chromatography Polystyrene-based beads Surface-initiated atom transfer radical polymerization 1,2,3-Triazole

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Recurrent coronal jets observed by SDO/AIA

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Research in Astronomy and Astrophysics 2021年第10期21卷 213-220页

作者： Yan-Jie Zhang Qing-Min Zhang jun dai Zhe Xu Hai-Sheng Ji Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryCASNanjing 210023China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China

In this paper,we carried out multiwavelength observations of three recurring jets on 2014November *** jets originated from the same region at the edge of AR 12205 and propagated along the same coronal *** eruptions were generated by magnetic reconnection,which is evidenced by continuous magnetic cancellation at the jet *** projected initial velocity of jet2 is~402 km s^(-1).The accelerations in the ascending and descending phases of jet2 are not consistent,the former is considerably larger than the value of g_(⊙) at the solar surface,while the latter is lower than g_(⊙).There are two possible candidates of extra forces acting on jet2 during its *** is the downward gas pressure from jet1when it falls back and meets with *** other is the viscous drag from the surrounding plasma during the fast propagation of *** a contrast,the accelerations of jet3 in the rising and falling phases are constant,implying that the propagation of jet3 is not significantly influenced by extra forces.

关键词： Sun:corona Sun:activity Sun:magnetic fields

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Complications of microvascular decompression in hemifacial spasm treatment Retrospective analysis of 156 cases

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Neural Regeneration Research 2008年第1期3卷 101-103页

作者： Yongfeng Sun Guanghui dai jun yuan Weidong Zhai Jianwei Zhong Tao Wang Department of Neurosurgery Beijing General Group Hospital the Chinese People＇s Armed Police Forces Beijing 100027 China

BACKGROUND： Microvascular decompression has become a well-accepted, safe method in the treatment of hemifacial spasms. However, postoperative complications exist and influence the prognosis of the disease. OBJECTIVE： This study aimed to analyze, by case review, the characteristics and regularity of microvascular decompression complications in the treatment of hemifacial spasm. DESIGN： Retrospective analysis. SETTING： Beijing General Group Hospital of the Chinese People＇s Armed Police Forces. PARTICIPANTS： A total of 156 patients with hemifacial spasm were admitted to the Department of Neurosurgery, Beijing General Group Hospital of the Chinese People＇s Armed Police Forces from june 2004 to june 2006 and recruited for this study. The patients, 57 males and 99 females, averaged 46 years of age （range 17-68-years old）. All suffered from facial innervated muscular paroxysmal and recurrent contraction, which could not be controlled by consciousness. Electromyogram demonstrated waves of fibrillation and fasciculation. Prior to admission, all patients had received other treatments. Written informed consents for treatment were obtained from all patients. This protocol was approved by the Hospital＇s Ethics Committee. METHODS： After anesthesia, a cranial bone pore was drilled below the connection of the lateral sinus and sigmoid sinus. Dura mater was dissected at the ＂⊥＂ shape and held in the air. Under microscopy, the flocculus cerebelli was lifted slightly up for convenient observation of the cerebellopontine angle. The mucous membrane was sharply separated. Corresponding vessels were identified at the root of the facial nerves and subsequently liberated and disassociated from the root exit zone. Suitably sized Teflon cotton was placed between the corresponding vessels and brain stem. MAIN OUTCOME MEASURES： Complications of microvascular decompression. RESULTS： All 156 patients participated in the final analysis. （1） Postoperatively, 66 （42%） patients presented with obvious

关键词： microvascular decompression hemifacial spasm postoperative complication

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Visible-light photoredox-mediated oxidation of N-methyl tertiaryamines under catalyst free conditions:Direct synthesis of methylene-bridged bis-1,3-dicarbonyl compounds

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Chinese Chemical Letters 2014年第4期25卷 545-548页

作者： Xiao-jun dai Xiao-Liang Xu Dong-Ping Cheng Xiao-Nian Li Institute of Industrial Catalysis College of Chemical Engineering and Materials ScienceZhejiang University of Technology College of Pharmaceutical Science Zhejiang University of Technology

Mediated by visible light-induced photoredox catalysis and free of other catalysts, a new and efficient synthesis of methylene-bridged bis-l,3-dicarbonyl derivatives has been developed. A variety of N-methyl tertiarya... 详细信息

关键词： Photochemistry Oxidation Aliphatic tertiaryamine Catalyst free

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Combined effects of earthworms and biochar on PAHs-contaminated soil remediation:A review

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Soil Ecology Letters 2023年第2期5卷 3-26页

作者： Shuyu Hou Jue Wang jun dai Mohammed Boussafir Chi Zhang College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510642China ISTO UMR 7327 CNRS-Universitéd’Orléans Orléans45071France E.A 6293 GéoHydrosytèmes COntinentaux(GeHCO) Facultédes Sciences et TechniquesParc de Grandmont37200 ToursFrance

Polycyclic aromatic hydrocarbons(PAHs)in soil pose a threat to the health of humans and other organisms due to their *** remediation method of combined application of biochar and earthworms has received growing attention owing to its effectiveness in PAHs ***,the earthworm-biochar interaction and its influence on PAHs in soil has not been systematically *** review focuses on the effectiveness of combined application of earthworms and biochar in the remediation of PAHs-contaminated soils and the underlying mechanisms,including adsorption,bioaccumulation,and ***-biochar interaction activates the functional microorganisms in soil and the PAHs-degrading microorganisms in earthworm guts,promoting PAHs *** review provides a theoretical support for the combined application of biochar and earthworms in the remediation of PAHs-contaminated soils,points out the limitations of this remediation method,and finally shows the prospects for future research.

关键词： earthworm biochar soil PAHs combined effect

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Two new cytotoxic sesquiterpenoids from Solanum lyratum

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Chinese Chemical Letters 2013年第11期24卷 1030-1032页

作者： Gui-Sheng Li Fang Yao Lei Zhang Xi-Dian Yue Sheng-jun dai School of Pharmaceutical Science Yantai University

Two new sesquiterpenoids,attributable to eudesmane-type（1 and 2,named solajiangxins F and G）,were isolated from the whole plant of Solanum *** structures were elucidated on the basis of integrated spectroscopic *** vitro,compounds 1 and 2 were found to show signifcant cytotoxic activity against selected cancer cells,including P-388,HONE-1 and HT-29.

关键词： Solanum lyratum Solanaceae Sesquiterpenoid Solajiangxins F–G Cytotoxic activity

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