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Dynamic coupling of ferrihydrite transformation and associated arsenic desorption/redistribution mediated by sulfate-reducing bacteria

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Journal of Environmental Sciences 2024年第1期135卷 39-50页

作者： Wenjing Zhou Huiyan Zhu Shiwen Hu bowei Zhang Kun gao Zhi Dang Chongxuan Liu State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of EducationSouth China University of TechnologyGuangzhou 510006China

Sulfate-reducing bacteria play an important role in the geochemistry of iron(oxyhydr)oxide and arsenic(As)in natural environments;however,the associated reaction processes are yet to be fully understood.In this study,batch experiments coupled with geochemical,spectroscopic,microscopic,and thermodynamic analyses were conducted to investigate the dynamic coupling of ferrihydrite transformation and the associated As desorption/redistribution mediated by Desulfovibrio vulgaris(D.vulgaris).The results indicated that D.vulgaris could induce ferrihydrite transformation via S^(2-)-driven and direct reduction processes.In the absence of SO_(4)^(2-),D.vulgaris directly reduced ferrihydrite,and As desorption and re-sorption occurred simultaneously during the partial transformation of ferrihydrite to magnetite.The increase in SO_(4)^(2-)loading promoted the S^(2-)-driven reduction of ferrihydrite and accelerated the subsequent mineralogical transformation.In the low and medium SO_(4)^(2-)treatments,ferrihydrite was completely transformed to a mixture of magnetite and mackinawite,which increased the fraction of As in the residual phase and stabilized As.In the high SO_(4)^(2-)treatment,although the replacement of ferrihydrite by only mackinawite also increased the fraction of As in the residual phase,22.1%of the total As was released into the solution due to the poor adsorption affinity of As to mackinawite and the conversion of As^(5+)to As^(3+).The mechanisms of ferrihydrite reduction,mineralogy transformation,and As mobilization and redistribution mediated by sulfate-reducing bacteria are closely related to the surrounding SO_(4)^(2-)loadings.These results advance our understanding of the biogeochemical behavior of Fe,S,and As,and are helpful for the risk assessment and remediation of As contamination.

关键词： Sulfate-reducing bacteria Arsenic Ferrihydrite Transformation Redistribution

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Efficient Organic Solar Cells with a High Open-Circuit Voltage of 1.34 V

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Chinese Journal of Chemistry 2019年第11期37卷 1153-1157页

作者： bowei gao Huifeng Yao Ling Hong Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular Sciences(BNLMS)CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Background and Originality Content Bulk heterojunction(BHJ)organic solar cells(OSCs)consisting of electron donor and electron acceptor as light absorbers have attracted broad attention due to their advantages of flexibility,light weight and low cost.[1-12] Over the last thirty years,great efforts have been made to promote the rapid progress of OSCs,leading to over 17%power conversion efficiencies(PCEs).[13,14]The innovative material design contributes a lot to achieve high PCEs of OSCs.

关键词： heterojunction Solar absorber

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累积连续流变挤压对Al-Mg(-Mn-Fe)合金组织性能影响

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精密成形工程 2024年第7期16卷 215-223页

作者：高民强杨博威管仁国大连交通大学连续挤压教育部工程研究中心辽宁大连116028

目的研究多道次累积连续流变挤压变形对Al-Mg(-Mn-Fe)合金组织演化和力学行为的影响,为高性能细晶Al-Mg(-Mn-Fe)合金的制备提供借鉴与参考。方法采用连续流变挤压方法制备Al-Mg(-Mn-Fe)合金,对流变挤压态Al-Mg(-Mn-Fe)合金进行多道次累... 详细信息

目的研究多道次累积连续流变挤压变形对Al-Mg(-Mn-Fe)合金组织演化和力学行为的影响,为高性能细晶Al-Mg(-Mn-Fe)合金的制备提供借鉴与参考。方法采用连续流变挤压方法制备Al-Mg(-Mn-Fe)合金,对流变挤压态Al-Mg(-Mn-Fe)合金进行多道次累积连续流变挤压变形,研究多道次变形前后Al-Mg(-Mn-Fe)合金的微观组织和力学性能变化,讨论变形过程中Al_(6)(Mn,Fe)相对动态再结晶的影响,揭示累积连续流变挤压态Al-Mg(-Mn-Fe)合金的强化机制。结果经3道次累积连续流变挤压变形后,Al-Mg合金和Al-Mg-Mn-Fe合金的平均晶粒尺寸分别减小至21.5μm和2.8μm,细化效果显著;在多道次变形过程中,Al-Mg-Mn-Fe合金内的Al_(6)(Mn,Fe)相逐渐破碎细化并趋于均匀分布,再结晶驱动力增加,阻碍再结晶晶粒长大;经3道次变形后,Al-Mg合金杆材的抗拉强度和伸长率同步提高至267.4 MPa和52.2%,而Al-Mg-Mn-Fe合金杆材的抗拉强度提高至364.2 MPa,伸长率降低至31.7%,该合金的强化机制主要包括细晶强化、位错强化和第二相强化。结论累积连续流变挤压变形可有效细化合金内的晶粒及第二相,提高Al-Mg(-Mn-Fe)合金的综合力学性能。

关键词： Al-Mg(-Mn-Fe)合金累积连续流变挤压变形道次组织性能

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Organic photovoltaic cell with 17% efficiency and superior processability

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National Science Review 2020年第7期7卷 1239-1246页

作者： Yong Cui Huifeng Yao Ling Hong Tao Zhang Yabing Tang Baojun Lin Kaihu Xian bowei gao Cunbin An Pengqing Bi Wei Ma Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University

The development of organic photoactive materials, especially the newly emerging non-fullerene electron acceptors(NFAs), has enabled rapid progress in organic photovoltaic(OPV) cells in recent years.Although the power conversion efficiencies(PCEs) of the top-performance OPV cells have surpassed 16%,the devices are usually fabricated via a spin-coating method and are not suitable for large-area production.Here, we demonstrate that the fine-modification of the flexible side chains of NFAs can yield 17% PCE for OPV cells. More crucially, as the optimal NFA has a suitable solubility and thus a desirable morphology, the high efficiencies of spin-coated devices can be maintained when using scalable blade-coating processing technology. Our results suggest that optimization of the chemical structures of the OPV materials can improve device performance. This has great significance in larger-area production technologies that provide important scientific insights for the commercialization of OPV cells.

关键词： organic photovoltaic cells power conversion efficiency scalable large-area production processability non-fullerene acceptor

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Microstructural evolution and strengthening mechanism of Al–Mg alloys with fine grains processed by accumulative continuous extrusion forming

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Journal of Materials Science & Technology 2022年第33期128卷 195-204页

作者： bowei Yang Yu Wang Minqiang gao Changfeng Wang Renguo Guan School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory of Near-Net Forming of Light Metals of Liaoning Province Dalian Jiaotong UniversityDalian 116028China Engineering Research Center of Continuous Extrusion Ministry of EducationDalian Jiaotong UniversityDalian 116028China

In this work,the mechanical properties and strengthening mechanisms induced by microstructural evolution in a rheo-extruded 5087 alloy processed via accumulative continuous extrusion forming(ACEF)were investigated.Electron back-scattered diffraction(EBSD)and transmission electron microscopy(TEM)were utilized to characterize the microstructure of the alloy subjected to ACEF with various passes.The grain refinement caused by continuous dynamic recrystallization(CDRX)was discussed.The results demonstrated that after 3 passes of ACEF,there was a significant grain refinement effect on the alloy,and the average grain size decreased from 45.6μm to 2.5μm;the ultimate tensile strength(UTS)and yield strength(YS)of the alloy increased to 362.8 MPa and 234.6 MPa,respectively.Dislocation cells/walls generated during deformation promoted the formation of low angle grain boundaries(LAGBs).The accumulative strain accelerated the transformation of LAGBs to high angle grain boundaries(HAGBs).Dislocation pile-up enhanced the driving force of CDRX,and nano-sized Al_6(Mn,Fe)phases at the grain boundaries inhibited the growth of grains due to the pinning effect.Based on the quantitative estimation,dislocation strengthening and grain boundary strengthening dominated the enhancement in YS of the ACEFed alloy.

关键词： Al-Mg alloy Grain refinement Mechanical property Dynamic recrystallization Strengthening mechanism

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Dietary supplementation with xylooligosaccharides and exogenous enzyme improves milk production,energy utilization efficiency and reduces enteric methane emissions of Jersey cows

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Journal of Animal Science and Biotechnology 2023年第6期14卷 2514-2524页

作者： Lifeng Dong Lei Zhao bowei Li Yanhua gao Tianhai Yan Peter Lund Zhuofan Liu Qiyu Diao Institute of Feed Research/Sino‑US Joint Lab On Nutrition and Metabolism of Ruminant Chinese Academy of Agricultural SciencesBeijing 100081China. School of Agriculture Ningxia UniversityYinchuan 750000China. College of Life Science and Technology Southwest Minzu UniversityChengdu 610041China. Agri-Food and Biosciences Institute Hillsborough Co.Down BT 266DRUK. Department of Animal Science Aarhus UniversityAU FoulumPO Box 508830 TjeleDenmark.

Background Sustainable strategies for enteric methane(CH_(4))mitigation of dairy cows have been extensively explored to improve production performance and alleviate environmental pressure.The present study aimed to investigate the effects of dietary xylooligosaccharides(XOS)and exogenous enzyme(EXE)supplementation on milk production,nutrient digestibility,enteric CH_(4) emissions,energy utilization efficiency of lactating Jersey dairy cows.Forty-eight lactating cows were randomly assigned to one of 4 treatments:(1)control diet(CON),(2)CON with 25 g/d XOS(XOS),(3)CON with 15 g/d EXE(EXE),and(4)CON with 25 g/d XOS and 15 g/d EXE(XOS+EXE).The 60-d experimental period consisted of a 14-d adaptation period and a 46-d sampling period.The enteric CO_(2)and CH_(4) emissions and O2 consumption were measured using two GreenFeed units,which were further used to determine the energy utilization efficiency of cows.Results Compared with CON,cows fed XOS,EXE or XOS+EXE significantly(P<0.05)increased milk yield,true protein and fat concentration,and energy-corrected milk yield(ECM)/DM intake,which could be reflected by the significant improvement(P<0.05)of dietary NDF and ADF digestibility.The results showed that dietary supplementation of XOS,EXE or XOS+EXE significantly(P<0.05)reduced CH_(4) emission,CH_(4)/milk yield,and CH_(4)/ECM.Furthermore,cows fed XOS demonstrated highest(P<0.05)metabolizable energy intake,milk energy output but lowest(P<0.05)of CH_(4) energy output and CH_(4) energy output as a proportion of gross energy intake compared with the remaining treatments.Conclusions Dietary supplementary of XOS,EXE or combination of XOS and EXE contributed to the improvement of lactation performance,nutrient digestibility,and energy utilization efficiency,as well as reduction of enteric CH_(4) emissions of lactating Jersey cows.This promising mitigation method may need further research to validate its long-term effect and mode of action for dairy cows.

关键词： Energy utilization efficiency Enteric methane emissions Exogenous enzyme Jersey cows Xylooligosaccharides

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波纹夹层吸能结构冲击响应试验研究

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武汉理工大学学报（交通科学与工程版） 2024年第1期48卷 86-90页

作者：张锋王维民潘晋高贵李世文宁伯伟许明财华中科技大学船舶与海洋工程学院武汉430074 中交第二公路勘察设计研究院有限公司武汉430056 武汉理工大学交通学院武汉430063 武九铁路客运专线湖北有限责任公司武汉430200 中铁大桥勘测设计院集团有限公司武汉430058 武汉力拓桥科防撞设施有限公司武汉430070

文中利用落锤仪对波纹夹层吸能结构进行横向低速冲击试验,基于试验结果讨论了冲击速度、填充情况等参数对波纹夹层结构冲击响应的影响。结果表明:波纹夹层吸能结构内部填充泡沫能显著减少结构变形,改变结构失效模式,在增大撞击力的同时... 详细信息

文中利用落锤仪对波纹夹层吸能结构进行横向低速冲击试验,基于试验结果讨论了冲击速度、填充情况等参数对波纹夹层结构冲击响应的影响。结果表明:波纹夹层吸能结构内部填充泡沫能显著减少结构变形,改变结构失效模式,在增大撞击力的同时,也会增加撞击持续时间,显著提高了结构的吸能性能.

关键词：桥梁船舶夹层结构冲击试验

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基于多目标配时优化模型和交通设计的城市交叉口协同优化研究

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物流科技 2024年第4期47卷 84-91页

作者：时柏营韩怀治程远高佩佩崔博伟山东建筑大学交通工程学院山东济南250101

文章基于多目标配时优化模型和交通设计,旨在缓解城市道路交通拥堵。通过分析城市道路交叉口交通流特性和问题,关注交叉口车流流向、车流交织点以及配时合理性。在交通设计方面,提出将左转车道右置的渠化设计方案。在配时优化方面,建立... 详细信息

文章基于多目标配时优化模型和交通设计,旨在缓解城市道路交通拥堵。通过分析城市道路交叉口交通流特性和问题,关注交叉口车流流向、车流交织点以及配时合理性。在交通设计方面,提出将左转车道右置的渠化设计方案。在配时优化方面,建立了多目标优化模型,以延误、通行能力和停车次数为优化目标,以各相位有效绿灯时间、交叉口饱和度及周期时长为约束条件。通过遗传算法对模型进行求解,并用SUMO仿真软件评价求解结果。研究结果表明,交叉口的时空资源得到更有效的利用,明显缓解了交通压力,为城市道路交叉口的运行、管理和规划提供了参考。

关键词：左转车道右置城市道路交叉口信号配时多目标优化遗传算法

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Design and Synthesis of 1,4-Dihydropyridine and Cinnamic Acid Esters and Their Antioxidant Properties

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Chemical Research in Chinese Universities 2016年第4期32卷 594-599页

作者： gao Yang WANG bowei gao Shang ZHANG Ruhui YANG Chunying SUN Zheng LIU Zhihui School of Stomatology Capital Medical University Beijing 100050 P. R. China The Second Hospital of Jilin University Changchun 130021 P. R. China School of Stomatology Jilin University Changchun 130021 P. R. China

In this study, cinnamic acid derivatives with pyridine ring were synthesized via Hantzsch reaction in order to expand conjugation system and their antioxidant abilities were tested. According to the evaluation results of their antioxidant properties, compounds 2 and 3 have similar antioxidant activity to prevent DNA from ＊OH- and Cu2＋/GSH induced oxidation, demonstrating that 1,4-dihydropyridine and pyridine nucleus exhibit good resistance to oxidation while the substituents have little effect. In the meantime, the AAPH-induced oxidative DNA damage [AAPH=2,2＇-azobis（2-methylpropionamidine）dihydrochloride] and trapping ABTS＋＊ test show that N--H bond and large conjugation systems are the pivotal parts to improve the activities of antioxidant.

关键词： Cinnamic acid 1,4-Dihydropyridine Free radical Oxidation Antioxidant DNA

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Synthesis and Properties of PGS-Li Scaffold

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Chemical Research in Chinese Universities 2018年第4期34卷 670-675页

作者： LIU Zhihui LU Yadong FENG Wei YANG Junxing gao Shang SONG Lijie WANG Yao WANG bowei Stomatology Hospital of Jilin University Changehun 130012 P. R. China The Seeond Hospital of Jilin University Changehun 130022 P R. China China-Japan Union Hospital of Jilin University Changehun 130033 P. R. China

Lithium ion-doped polyglycerol sebacate scaftbld（PGS）-Li was synthesized by adding lithium ions to po- lyglycerol sebacate（PGS） during its crosslinking process due to the specific effects of lithium ions on periodontal li- gament cells, cementoblasts and the eminent performance of PGS. The molecular mass, composition, structure, porosity, thermal properties, and hydrophilicity of the composite were characterized by gel permeation chromatogra- phy（GPC）, Fourier transform infrared spectroscopy（FTIR）, inductively coupled plasma optical emission spectrome- ter（ICP-OES）, scanning electron microscopy（SEM）, X-ray photoelectron spectroscopy（XPS）, thermogravimetric analyzer（TGA） and contact angle measurments, and the degradation of the material was evaluated by in vitro degra- dation experiments. The biological activity of PGS-Li scaffold was detected by calcein-AM staining and cytotoxicity test. The results indicate that PGS-Li scaffold has been successfully synthesized, which has similar composition and structure to PGS, but slightly larger molecular weight. In addition, the porosity and pore size of PGS-Li scaffold ba- sically meet the requirements of engineering scaffold materials and the seaffold shows better performance in terms of hydrophilicity and thermal stability than PGS. In vitro degradation experimental results show that the degradation rate of PGS-Li scaffold is higher than that of PGS. What＇s more, the results of cytotoxicity test and cell staining show that there is no significant difference in the proliferation and cell morphology of cementoblasts.

关键词： Lithium Polyglycerol sebacate（PGS） Tissue engineering Dental cementum

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