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Pilot-scale catalytic ozonation pretreatment for improving the biodegradability of fixed-bed coal gasification wastewater

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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION 2021年 148卷 13-19页

作者： Chen, Xiaoya Wang, Chunrong Jiang, Longxin li, Haiyan Wang, Jianbing He, xuwen China Univ Min & Technol Beijing Sch Chem & Environm Engn Beijing 100083 Peoples R China

Achieving zero liquid dischargeis a requirement for the development of the coal chemical industry;high pollutant concentration, strong biotoxicity, and poor biodegradability (BOD5/COD=0.1-0.2) make fixed-bed coal gasification wastewater difficult to treat. This study synthesized a Fe-Mn/lava catalyst (FMLC) and performed a pilot-scale test on catalytic ozonation for the pretreatment of fixed-bed coal gasification wastewater. The effects of ozone and catalyst dosages were investigated, and the changes in the organics, biotoxicity, and biodegradability of wastewater were analyzed using three-dimensional fluorescence spectroscopy, BOD5/COD, and specific oxygen uptake rate (SOUR). Energy consumption was also calculated. The removal efficiencies (at a flow rate of 1.0 m(3)/h, ozone dosage of 179 g/h, and catalyst dosage of 40 kg/m(3)) of COD and BOD5 were 61.77% and 16.98%, respectively, after 30 days of continuous operation. Toxic refractory macromolecular organic pollutants were transformed into small, biodegradable substances. BOD5/COD increased from 0.16 to 0.35, and SOUR decreased from 2.8460 to 2.3180 mgO(2)/(gMLSS.h). The operating cost was 1.24 kWh/kg COD. Catalytic ozonation as a pretreatment technology markedly improved biodegradability, reduced biotoxicity, and looks to be promising for treating fixed-bed coal gasification wastewater. (C) 2020 Published by Elsevier B.V. on behalf of Institution of Chemical Engineers.

关键词： Fixed-bed coal gasification wastewater Pilot-scale Catalytic ozonation Fe-Mn/lava catalyst Pretreatment Biodegradability

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诉讼威慑与公司治理优化——基于康美药业集体诉讼的事件研究证据

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北京工商大学学报（社会科学版） 2024年第4期39卷 129-142页

作者：李春涛闫续文宋敏河南大学国际商学院河南开封475001 中南财经政法大学金融学院湖北武汉430073 武汉大学经济与管理学院湖北武汉430072

股东的权利,从享有公司收益、参与重大决策,到提起诉讼要求损害赔偿,被广泛认为是一个经济体中有效配置资本的重要影响因素。康美药业案作为中国第一起实质性集体诉讼,其判决结果深刻影响了资本市场主体的行为。采用事件研究法,以2018—... 详细信息

股东的权利,从享有公司收益、参与重大决策,到提起诉讼要求损害赔偿,被广泛认为是一个经济体中有效配置资本的重要影响因素。康美药业案作为中国第一起实质性集体诉讼,其判决结果深刻影响了资本市场主体的行为。采用事件研究法,以2018—2022年中国A股上市公司为样本,检验了2021年11月12日康美药业证券虚假陈述集体诉讼案一审判决所带来的强化股东保护的公司治理效应。结果发现,盈余管理程度高、被交易所问询多以及存在关联交易的企业,在康美药业案一审判决前后的市场反应更差。此外,相较于其他重要事件日,一审判决对潜在违规企业的威慑更为明显,且威慑效应具有持续性,公司更倾向于守法经营,带来公司治理的优化。为保障中小股东的合法权益,建议政府进一步降低集体诉讼门槛和维权成本,为投资者提供便捷有效的诉讼维权渠道;上市公司增强财务信息质量和透明度,守法经营,依法披露,提升内部治理水平。

关键词：康美药业盈余管理问询函关联交易事件研究集体诉讼

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广州从化南平村风水林植物群落学特征及规划建议

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南方林业科学 2019年第1期47卷 49-54页

作者：李磊李许文倪建中代色平乳源瑶族自治县林业局广东乳源512700 广州市林业和园林科学研究院广东广州510405 广州市景观建筑重点实验室广东广州510405

采用现场全面踏查和样地调查相结合的方法,研究了广东省广州市从化区南平村风水林植物群落特征。在3个面积为400 m2的调查样方中,共记录植物134种(包括种下单位),隶属于77科114属。植物种类丰富,以大戟科、桑科、壳斗科和紫金牛科植物... 详细信息

采用现场全面踏查和样地调查相结合的方法,研究了广东省广州市从化区南平村风水林植物群落特征。在3个面积为400 m2的调查样方中,共记录植物134种(包括种下单位),隶属于77科114属。植物种类丰富,以大戟科、桑科、壳斗科和紫金牛科植物占优势。该群落具有南亚热带常绿阔叶林的典型群落结构,垂直结构分层明显,层次清晰。400 m2样地面积内,乔灌木群落的Shannon-Winner指数都在2.7以上,Simpson多样性指数在0.8以上,群落均匀度在2.0以上。该样地生物多样性的各项指标远远大于本地的一些风水林。研究成果对广州从化乡村绿化美化建设、风水林的保护、生态公益林造林、园林开发应用具有参考价值。

关键词：风水林树种组成群落结构物种丰富度规划建议广州

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Analysis and Design of Adversarial Virtual Simulation Training System 21

Analysis and Design of Adversarial Virtual Simulation Traini...

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13th International Conference on Computer Modeling and Simulation, ICCMS 2021

作者： Sun, xuwen li, Shixiong Xing, Yu Dalian Naval Academy China China Coast Guard Academy China

ISBN: (纸本)9781450389792

In order to improve the high degree of close to training reality for college teaching and training, an antagonistic virtual simulation training system is constructed by analyzing and designing. First, the basic process of antagonistic training is analyzed for preparation, training implantation, and training evaluation, then the process is modeled, and modeled. And then, functional requirements of adversarial virtual simulation training is analyzed and studied, after which, the technical architecture is designed, and core technique is discussed. The study lays a foundation for the design and implementation of the antagonistic virtual simulation training system in future. © 2021 ACM.

关键词： E-learning

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Two New Baccharane Glycosides from Seeds of Impatientis balsamina L. with in vitro Growth Inhibitory Activity in Human Cancer A375 Cells

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Chemical Research in Chinese Universities 2017年第5期33卷 753-757页

作者： WU Oian JIN Yongri YAO Hua liU Ying li Peng li xuwen College of Chemistry Jilin University Changchun 130021 P R. China Scientific Research Center China-Japan Union Hospital of Jilin University Changchun 130021 P. R. China

Two new baccharane-type glycosides（1 and 2）, together with seven known baccharane-type glycosides （3u9） hosenkoside A, hosenkoside B, hosenkoside C, hosenkoside F, hosenkoside M, hosenkoside K and hosenko- side G were isolated from the dried seeds of Impatientis balsamina L. The new baccharane-type glycosides were identified as honsenkol A-3-O-β-D-glucopyranosyl-26-O-p-D-glucopyranosyl-28-O-β-D-glucopyranosyl-O-β-D- glucopyranosyl（1） and （3S,4R,17R,20S）17-hydrroxy-3-O-β-D-xylopyranose（12）-β-D-glucopyranosyl-26-O-β-D- glucopyranosyl-28-O-β-D-glucopyranosyl-21,24-epoxybaccharane（2）, respectively, by spectroscopic methods, in- cluding NMR（1D and 2D）, IR and HR-ESI-MS. Compounds 1 and 2 were evaluated for in vitro inhibitory activity against the cell lines. Compound 2 with a new baccharane skeleton had anti-hepatic fibrosis activity against A375 cells in bioassay results, which means the new compounds have potential value in antitumor applications.

关键词： Impatientis balsamina L. Seed Baccharane-type glycoside Cytotoxic activity

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Use of Triangular Silver Nanoplates as Low Potential Redox Mediators for Electrochemical Sensing

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ANALYTICAL CHEMISTRY 2021年第6期93卷 3295-3300页

作者： Gao, xuwen Dong, Shuangtian Fu, li Zhang, Bin Hsu, Hsien-Yi Zou, Guizheng Shandong Univ Sch Chem & Chem Engn Jinan 250100 Peoples R China City Univ Hong Kong Sch Energy Hong Kong 999077 Peoples R China City Univ Hong Kong Dept Mat Sci & Engn Hong Kong 999077 Peoples R China

Redox mediators can facilitate the electrochemical communication between targets and electrodes for material characterization and investigation. To provide an alternative to the chemical-based redox mediators, herein, we present a nanoparticle-based redox mediator, i.e., the trisodium citrates (TSC)-capped triangular silver nanoplates (Tri-Ag-NPTSC), which demonstrates an efficient oxidative process at around 0.13 V (vs Ag/AgCl) with acceptable redox reversibility by exploiting the interaction between the carbonyl group of TSC and the Ag element of Tri-Ag-NPTSC. The TSC of Tri-Ag-NPs can be selectively replaced by thiols and enable the obtained Tri-Ag-NPTSC-thol with changed electrochemical redox response, which could be utilized to determine various thiols at 0.13 V, a much lowered oxidative potential than traditional redox mediators, with a similar linear response range, response slope, and limit of detection (LOD). This work proposes a surface-engineering approach to design and develop electrochemical redox probes using Ag nanoparticles with particular morphology, indicating that the interaction between the carbonyl group and Ag nanoparticles might be extended to sensing application beyond the surface-enhanced Raman scattering.

关键词： Silver nanoparticle Thiol

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Hermetic Packaging Based on Cu-Sn and Au-Au Dual Bonding for High-Temperature Graphene Pressure Sensor

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MICROMACHINES 2022年第8期13卷 1191-1191页

作者： Wang, Junqiang Zhang, Haikun Chen, xuwen li, Mengwei North Univ China Acad Adv Interdisciplinary Res Taiyuan 030051 Peoples R China North Univ China Not Key Lab Instrumentat Sci & Dynam Measurement Taiyuan 030051 Peoples R China

A chip-level hermetic package for a high-temperature graphene pressure sensor was investigated. The silicon cap, chip and substrate were stacked by Cu-Sn and Au-Au bonding to enable wide-range measurements while guaranteeing a high hermetic package. Prior to bonding, the sample was treated with Ar (5% H-2) plasma. The Cu-Sn bonding was firstly performed at 260 degrees C for 15 min with a pressure of 9.9 MPa, and the corresponding process conditions for Au-Au bonding has increased to 300 degrees C, 20 min and 19.8 MPa respectively. The average shearing strength was 14.3 MPa, and an excellent leak rate of 1.72 x 10(-4) Pa center dot cm(3)/s was also achieved. After high-temperature storage (HTS) at 350 degrees C for 10 h, the resistance of graphene decreased slightly because the dual bonding provided oxygen-free environment for graphene. The leakage rate of the device slightly increased to 2.1 x 10(-4) Pa center dot cm(3)/s, and the average shear strength just decreased to 13.5 MPa. Finally, under the pressure range of 0-100 MPa, the graphene pressure sensor exhibited a high average sensitivity of 3.11 omega/MPa. In conclusion, the dual bonding that combined Cu-Sn and Au-Au is extremely suitable for hermetic packaging in high-temperature graphene pressure sensors.

关键词： Cu-Sn bonding Au-Au bonding graphene high-temperature pressure sensor

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Dual-potential encoded electrochemiluminescence for multiplexed gene assay with one luminophore as tag

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BIOSENSORS & BIOELECTRONICS 2023年第1期236卷 115418页

作者： Gao, xuwen Ren, Xiaoxuan Ai, Yaojia li, Mengwei Zhang, Bin Zou, Guizheng Shandong Univ Sch Chem & Chem Engn Jinan 250100 Peoples R China

Multiplexed gene assay for simultaneously detecting the multi-targets of nucleic acids is strongly anticipated for the accurate diseases diagnosis and prediction, and all commercial available gene assays for IVD are a kind of single-target assay. Herein, a dual-potential encoded and coreactant-free electrochemiluminescence (ECL) strategy is proposed for the multiplexed gene assay, which can be conveniently carried out by directly oxidizing the same luminescent tag of dual-stabilizers-capped CdTe nanocrystals (NCs). The CdTe NCs linked with sulfhydryl-RNA via Cd-S bond merely exhibits one ECL process around 0.32 V with a narrow triggeringpotential-window of 0.35 V, while CdTe NCs linked with amino-RNA via amide linkage solely gives off one ECL process around 0.82 V with a narrow triggering-potential-window of 0.30 V. Multiplexing ECL of both sulfhydryl-RNA-functionalized CdTe NCs and amino-RNA-functionalized CdTe NCs can be utilized to simultaneously detect the open reading frame 1ab (ORF1ab) and the nucleoprotein (N) genes without crosstalk, in which ECL of sulfhydryl-RNA-functionalized CdTe NCs can dynamically determine ORF1ab from 200 aM to 10 fM with a limit of detection (LOD) of 100 aM, while ECL of amino-RNA-functionalized CdTe NCs can linearly detect N gene from 5 fM to 1 pM with a LOD of 2 fM. Post-engineering CdTe NCs with RNA in a labeling-bond engineering way would provide a potential-selective and encoded ECL strategy for multiplexed gene assay with one luminophore.

关键词： Electrochemiluminescence Bond -involved Coreactant-free Potential -resolved Multiplexing gene assay Dual -potential encoded

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SEIARN Parameter Adaptive Model based on SSA

International Core Journal of Engineering

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International Core Journal of Engineering 2023年第4期9卷 378-383页

作者： Zhiwei Yang Yuqing Sun Hangyu He Xinru li xuwen Sun

The SEIARN model is often used to predict infectious diseases, but the parameter estimation of the SEIARN model has always been one of the difficulties in this research. Traditional statistical and empirical estimation methods have certain limitations. To this end, we designed an SSA‐based SEIARN parameter adaptive model, optimized parameters through SSA, and used historical epidemic data in Hebei, Tianjin, and Beijing for simulation. Experiments finally proved the feasibility of the algorithm.

关键词： SEIARN SSA Parameter Optimization Epidemic Prediction

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High-performance photodetectors based on two-dimensional perovskite crystals with alternating interlayer cations

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Journal of Materiomics 2023年第4期9卷 817-823页

作者： Yezhan li Zhengxun Lai You Meng Wei Wang Yuxuan Zhang xuwen Zhao Di Yin Weijun Wang Pengshan Xie Quan Quan SenPo Yip Johnny C.Ho Department of Materials Science and Engineering City University of Hong Kong999077Hong Kong SARChina Institute for Materials Chemistry and Engineering Kyushu UniversityFukuoka816-8580Japan State Key Laboratory of Terahertz and Millimeter Waves City University of Hong Kong999077Hong Kong SARChina

Organic-inorganic halide perovskite,as a low-cost,solution-processable material with remarkable optoelectronic properties,is ideal candidate to fabricate high-performance photodetectors and is expected to significantly reduce device *** to the common Dion-Jacobson and Ruddlesden-Popper two-dimensional(2D)layered hybrid perovskite compounds,the perovskites with alternating cations in the interlayer(ACI)phase show higher crystal symmetry and narrower optical bandgaps,which exhibit great potential for excellent photodetection ***,we report a high-performance photodetector based on the 2D bilayered hybrid lead halide perovskite single crystal with the ACI phase(GAMA_(2)Pb_(2)I_(7);GA=C(NH_(2))_(3)and MA=CH_(3)NH_(3)).The single-crystal photodetector exhibits high photoresponsivity of 1.56,2.54,and 2.60 A/W for incident light wavelengths of 405,532,and 635 nm under 9.82 nW,respectively,together with the correspondingly high detectivity values of 1.86×10^(12),3.04×10^(12),and 3.11×10^(12)Jones under the same operating ***,a high-resolution imaging sensor is built based on the GAMA_(2)Pb_(2)I_(7)single-crystal photodetector,confirming the high stability and photosensitivity of the imaging *** results show that the 2D hybrid lead halide perovskites with alternating interlayer cations are promising for high-performance visible light photodetectors and imaging systems.

关键词： Photodetector Two-dimensional Hybrid perovskite Alternating interlayer cation Imaging

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