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Fate of Parent and Substituted Polycyclic Aromatic Hydrocarbons in SBR/MBBR Treatment Process:Experimental Value Against Model Prediction

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Journal of Ocean University of China 2023年第2期22卷 479-489页

作者： ZHAO jing TIAN Weijun LIU Shuhui QIAO kaili DU Zhaoyang XIE Wenlong College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China

The knowledge of the existence,distribution and fate of polycyclic aromatic hydrocarbons(PAHs)and substituted polycyclic aromatic hydrocarbons(SPAHs)in wastewater treatment plants(WWTPs)was vital for reducing their concentrations entering the aquatic environment.The concentrations of 13 SPAHs and 16 PAHs were all determined in a WWTP with styrene butadiene rubber(SBR)in partnership with the moving bed biofilm reactor(MBBR)process.SPAHs presented a higher concentration lever than PAHs in nearly all samples.The total removal efficiencies of PAHs and SPAHs ranged from 64.0%to 71.36%and 78.4%to 79.7%,respectively.The total yearly loads of PAHs(43.0 kg)and SPAHs(73.0 kg)were mainly reduced by the primary and SBR/MBBR biological treatment stages.The tertiary treatment stage had a minor contribution to target compounds removal.According to a synthesis and improvement fate model,we found that the dominant processes changed as the chemical octanol water partition coefficient(K_(ow))increased.But the seasonal variations of experimental removal efficiencies were more obvious than that of predicted data.In the primary sedimentation tank,dissolution in the aqueous phase and sorption to sludge/particulate matter were controlling processes for the removal of PAHs and SPAHs.The sorption to sludge and biodegradation were the principal removal mechanisms during the SBR/MBBR biological treatment process.The contribution of volatilization to removal was always insignificant.Furthermore,the basic physicochemical properties and operating parameters influenced the fate of PAHs and SPAHs in the WWTP.

关键词： substituted polycyclic aromatic hydrocarbons moving bed biofilm reactor removal efficiency fate process model

Transcriptional mechanism of IRF8 and PU.1 governs microglial activation in neurodegenerative condition

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Protein & Cell 2019年第2期10卷 87-103页

作者： Nan Zhou kaili Liu Yue Sun Ying Cao jing Yang State Key Laboratory of Membrane Biology Peking UniversityBeijing 100871China IDG/McGovern Institute for Brain Research Peking UniversityBeijing 100871China Center for Life Sciences Peking UniversityBeijing 100871China School of Life Sciences Peking UniversityBeijing 100871China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China School of Medicine Tsinghua UniversityBeijing 100084China

Microglial activation occurs in divergent neuropathological conditions.Such microglial event has the key involvement in the progression of CNS diseases.However,the transcriptional mechanism governing microglial activation remains poorly understood.Here,we investigate the microglial response to traumatic injuryinduced neurodegeneration by the 3D fluorescence imaging technique.We show that transcription factors IRF8 and PU.1 are both indispensible for microglial activation,as their specific post-developmental deletion in microglia abolishes the process.Mechanistically,we reveal that IRF8 and PU.1 directly target the gene transcription of each other in a positive feedback to sustain their highly enhaneed expression during microglial activation.Moreover,IRF8 and PU.1 dictate the microglial response by cooperatively acting through the composite IRF-ETS motifs that are specifically enriched on microglial activation-related genes.This action of cooperative transcription can be further verified bio chemically by the synergetic binding of IRF8 and PU.1 proteins to the composite-motif DNA.Our study has therefore elucidated the central transcriptional mechanism of microglial activation in response to neurodegenerative condition.

关键词： microglia 3D fluorescence imaging technique neurodegeneration IRF8 PU.1

Recent advances in smart stimuli-responsive biomaterials for bone therapeutics and regeneration

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Bone Research 2022年第1期10卷 46-64页

作者： Hongpu Wei Jinjie Cui kaili Lin jing Xie Xudong Wang Department of Oral&Cranio-Maxillofacial Surgery Shanghai Ninth People’s HospitalCollege of StomatologyShanghai Jiao Tong University School of MedicineNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of Stomatology&Shanghai Research Institute of StomatologyShanghai 200011China State Key Laboratory of Oral Diseases West China Hospital of StomatologySichuan UniversityChengdu 610041China

Bone defects combined with tumors, infections, or other bone diseases are challenging in clinical practice. Autologous and allogeneic grafts are two main traditional remedies, but they can cause a series of complications. To address this problem,researchers have constructed various implantable biomaterials. However, the original pathological microenvironment of bone defects, such as residual tumors, severe infection, or other bone diseases, could further affect bone regeneration. Thus, the rational design of versatile biomaterials with integrated bone therapy and regeneration functions is in great demand. Many strategies have been applied to fabricate smart stimuli-responsive materials for bone therapy and regeneration, with stimuli related to external physical triggers or endogenous disease microenvironments or involving multiple integrated strategies. Typical external physical triggers include light irradiation, electric and magnetic fields, ultrasound, and mechanical stimuli. These stimuli can transform the internal atomic packing arrangements of materials and affect cell fate, thus enhancing bone tissue therapy and regeneration. In addition to the external stimuli-responsive strategy, some specific pathological microenvironments, such as excess reactive oxygen species and mild acidity in tumors, specific p H reduction and enzymes secreted by bacteria in severe infection, and electronegative potential in bone defect sites, could be used as biochemical triggers to activate bone disease therapy and bone regeneration.Herein, we summarize and discuss the rational construction of versatile biomaterials with bone therapeutic and regenerative functions. The specific mechanisms, clinical applications, and existing limitations of the newly designed biomaterials are also clarified.

关键词： biomaterials smart rational

Single crystalline CeO_(2) nanotubes

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Nano Research 2021年第3期14卷 715-719页

作者： Fangxian Cao Mingkai Zhang kaili Yang Zhimin Tian jing Li Yongquan Qu Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi’an710049China College of Chemistry and Chemical Engineering Liaocheng UniversityLiaocheng252059China Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an710072China

Here,we report a facile synthetic methodology to prepare uniform single crystalline CeO_(2) nanotubes through a hydrothermal transformation of CeO_(2) nanorods in aqueous Ce(NO3)3 solution.A chemically driven etching-dissolution-deposition mechanism is proposed,involving the surface Ce^(3+)hydrolysis and dissolution at tips of nanorods and subsequent redeposition and crystallization on the outer sides of nanorods.Compared to CeO_(2) nanorods,CeO_(2) nanotubes exhibited the richer structural defects,higher reducibility and larger surface area,leading to a higher haloperoxidase-like activity.

关键词： CeO_(2)nanorod hydrothemal transformation CeO_(2)nanotube etching-dissolution-deposition mechanism haloperoxidase-like activity

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预应力钢板带加固砖砌体墙抗震性能试验研究

湖南大学学报（自然科学版） 2021年第7期48卷 19-27页

作者：敬登虎乔墩邢凯丽东南大学土木工程学院江苏南京211189

为了改善正交钢板带加固砖砌体墙的应力滞后问题,提出在横向钢板带中施加预拉应力,并进行了5片墙体的低周往复荷载试验,得到试件的破坏过程,分析其滞回曲线、骨架曲线、承载力、刚度和延性.结果表明:预应力钢板带加固砖砌体墙能够有效... 详细信息

为了改善正交钢板带加固砖砌体墙的应力滞后问题,提出在横向钢板带中施加预拉应力,并进行了5片墙体的低周往复荷载试验,得到试件的破坏过程,分析其滞回曲线、骨架曲线、承载力、刚度和延性.结果表明:预应力钢板带加固砖砌体墙能够有效地提高其抗震性能;横向钢板带中的预应力水平在适当范围内提高时,能进一步提高试件的承载力,且对开裂点抗侧刚度几乎无影响,但延性有所下降;提高墙体的负荷水平,试件的承载力和抗侧刚度均增加,延性有小幅下降;当墙体的高宽比提高至1时,加固效果相对较差.此外,基于横向钢板带中应变发展规律的分析,可以发现施加预应力能有效提高材料的利用率.最后,给出了预应力控制的建议值和抗剪承载力计算公式.

关键词：砖砌体墙钢板带预应力抗震加固滞回曲线

汽车用铝-铜异种材料摩擦焊接微结构和力学性能研究

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铸造技术 2016年第6期37卷 1232-1235页

作者：齐凯丽李静新乡职业技术学院机械制造系河南新乡453000 新乡职业技术学院机电工程系河南新乡453000

以6082-T6铝和商业纯铜为对象,研究了Al-Cu的连续驱动摩擦焊,利用光学显微镜、扫描电子显微镜和X射线衍射分析技术分析了焊接界面的微结构。结果表明,接头的拉伸强度比铝母材的强度高3.8%。焊接接头的拉伸断裂位置发生在铝侧,断裂形貌... 详细信息

以6082-T6铝和商业纯铜为对象,研究了Al-Cu的连续驱动摩擦焊,利用光学显微镜、扫描电子显微镜和X射线衍射分析技术分析了焊接界面的微结构。结果表明,接头的拉伸强度比铝母材的强度高3.8%。焊接接头的拉伸断裂位置发生在铝侧,断裂形貌表明失效形式为韧窝状结构的韧性断裂。

关键词：铝铜异种金属力学性能摩擦焊

内嵌碳纤维增强复合材料加固梁的延性提升方法

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同济大学学报（自然科学版） 2016年第11期44卷 1667-1673,1694页

作者：余江滔詹凯利陈竟同济大学结构工程与防灾研究所上海200092 上海市工程结构安全重点实验室上海200032 中衡设计集团股份有限公司江苏苏州215123

提出一种新的内嵌碳纤维增强复合材料(CFRP)延性加固的方法,使CFRP在极限状态下发生稳定、有限度的滑移,在充分利用CFRP强度的同时,避免CFRP断裂,从而提高加固构件的延性.介绍了内嵌CFRP延性加固的设计方法,并通过CFRP嵌条的黏结-滑移... 详细信息

提出一种新的内嵌碳纤维增强复合材料(CFRP)延性加固的方法,使CFRP在极限状态下发生稳定、有限度的滑移,在充分利用CFRP强度的同时,避免CFRP断裂,从而提高加固构件的延性.介绍了内嵌CFRP延性加固的设计方法,并通过CFRP嵌条的黏结-滑移试验和内嵌CFRP加固钢筋混凝土梁的弯曲试验验证了加固方法及设计方法的有效性.

关键词：内嵌碳纤维增强复合材料加固试验延性

重金属Ni胁迫对人工湿地废弃物厌氧处置的影响

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水处理技术 2018年第5期44卷 61-65页

作者：尚杰周口职业技术学院河南周口466000

研究了AP中大量含有的重金属Ni对AP厌氧消化产气量、系统稳定性、有机物降解及关键酶活性的影响。结果表明,质量浓度20 mg/L的Ni能够促进甲烷产量并且最大产量为162 m L/g,比空白对照组提高了44.6%,并且能够提高甲烷日产量以及甲烷百分... 详细信息

研究了AP中大量含有的重金属Ni对AP厌氧消化产气量、系统稳定性、有机物降解及关键酶活性的影响。结果表明,质量浓度20 mg/L的Ni能够促进甲烷产量并且最大产量为162 m L/g,比空白对照组提高了44.6%,并且能够提高甲烷日产量以及甲烷百分含量。但高浓度Ni抑制甲烷产生,并减少甲烷的日产量。机理研究发现,适量浓度Ni能为厌氧微生物提供微量元素,进而提高厌氧消化系统稳定性及提供充足的挥发性脂肪酸。此外,20 mg/L Ni提高了纤维素酶的活性,并且对F420影响不明显。

关键词：水生植物厌氧消化 Ni 酶活性

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情绪特质对建筑工人危险感知的差异化影响

工程管理学报 2023年第1期37卷 124-129页

作者：顾婧韩豫陈凯莉江苏大学土木工程与力学学院江苏镇江212000 江苏大学城市环境与工程安全行为系统研究中心江苏镇江212013

为更深入地揭示情绪特质对建筑工人危险感知行为的影响规律,减少事故发生,立足中国建筑工人的群体与个体特质,以情绪等相关理论为支撑,基于自主开发的“情绪特质-危险感知”问卷,利用科学统计方法与指标,探究了不同情绪特质下工人的危... 详细信息

为更深入地揭示情绪特质对建筑工人危险感知行为的影响规律,减少事故发生,立足中国建筑工人的群体与个体特质,以情绪等相关理论为支撑,基于自主开发的“情绪特质-危险感知”问卷,利用科学统计方法与指标,探究了不同情绪特质下工人的危险感知行为差异。结果表明:工人的危险感知能力与情绪特质呈正相关,良好的情绪管理能力有利于增强工人危险感知能力;情绪特质最直接影响工人危险知觉水平,情绪化的工人危险知觉水平偏弱;工人良好的情绪管理能力对危险认知有显著影响,最显著体现为提高工人信息分析稳定性。

关键词：施工安全建筑工人情绪特质危险感知差异分析