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Interfacial processes and mechanisms of synergistic degradation of dichlorobiphenyl by white rot fungi and magnetite nanoparticles

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Science China Earth Sciences 2023年第9期66卷 2057-2065页

作者： Le CHANG guanghui yu Congqiang LIU Institute of Surface-Earth System Science School of Earth System ScienceTianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai RimBohai Coastal Critical Zone National Observation and Research StationTianjin UniversityTianjin 300072China

The rapid increase in the artificial syntheses of organic pollutants has raised widespread ***,the mechanisms by which fungi degrade these new organic pollutants in the environment and adapt to environmental stressors remain *** this study,Phanerochaete chrysosporium,a model white rot fungus,was used to explore the interfacial processes and mechanisms for synergistic degradation of 4,4′-dichlorobiphenyl(PCB15)with magnetite *** results showed that after 3 and 5 days of cultivation with Phanerochaete chrysosporium alone,the rates for PCB15 degradation were 32%and 65%,respectively,indicating that the white rot fungus itself was able to degrade the organic ***,the addition of magnetite nanoparticles significantly enhanced the degradation of PCB15 by Phanerochaete *** cocultivation for 3 and 5 days,the rates for PCB15 degradation increased to 42%and 84%,*** radiation-based Fourier transform infrared spectromicroscopy(SR-FTIR)showed that the magnetite particles were tightly adhered to the fungal hyphae and were unevenly distributed on the hyphal ***,cocultivation of the fungus and magnetite nanoparticles significantly enhanced the nanozymatic activity of magnetite.A linear regression model provided a significantly negative correlation(r=−0.96,p<0.001)between the nanozymatic activity of the magnetite and the concentration ratio of the PCB15,supporting the hypothesis that white rot fungi degraded the PCB15 by enhancing the nanozyme activity of ***-resolution X-ray photoelectron spectroscopy(XPS)revealed that the nanozymatic activity of magnetite was mainly governed by oxygen vacancies on the mineral surfaces rather than the iron ***,these findings increase our understanding of the powerful capabilities of fungi in terms of stress resistance and adaptation to extreme environments and provide new insights into fungal-mediated degradation of organic po

关键词： Magnetite nanoparticles Nanozymes Oxygen vacancies White rot fungi X-ray photoelectron spectroscopy Synchrotron radiation based FTIR spectromicroscopy Dichlorobiphenyl

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基于故障树的排故策略制定

兵工自动化 2024年第6期43卷 56-60页

作者：王文鹏邹刚梁佐堂于光辉海军航空大学青岛校区一系山东青岛266041

针对舰载机维护中底事件发生概率不能得到最快排故策略的问题,提出一种结合故障概率和检查时间的重要度指标,用来制定排故策略。用包含底事件发生概率和检查时间的公式计算排故重要度和第二排故重要度;以拦阻钩放不下来的故障为例,制定... 详细信息

针对舰载机维护中底事件发生概率不能得到最快排故策略的问题,提出一种结合故障概率和检查时间的重要度指标,用来制定排故策略。用包含底事件发生概率和检查时间的公式计算排故重要度和第二排故重要度;以拦阻钩放不下来的故障为例,制定排故策略,并用蒙特卡罗方法进行验证。验证结果表明,该排故重要度方法排故总时间较短。

关键词：故障树重要度排故拦阻钩

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浅述氧化性固体的储存火灾危险性类别

山东化工 2024年第13期53卷 241-243页

作者：虞胜福王金光于光辉济南艾克斯博特安全技术咨询有限公司山东济南250100 山东金港港务有限公司山东东营257237

为了给有关人员对氧化性固体火灾危险性类别的准确判断提供必要的依据,分析了氧化性固体包装类别与其储存火灾危险性类别的关系。依据联合国有关危险货物运输的文件资料、GB 12268—2012《危险货物品名表》《危险化学品分类信息表》和... 详细信息

为了给有关人员对氧化性固体火灾危险性类别的准确判断提供必要的依据,分析了氧化性固体包装类别与其储存火灾危险性类别的关系。依据联合国有关危险货物运输的文件资料、GB 12268—2012《危险货物品名表》《危险化学品分类信息表》和欧洲化学品管理局官方网站数据库,对GB 50160—2008(2018年版)《石油化工企业设计防火标准》解释条文表3中所列举的氧化性固体包装类别进行比较,并对氧化性固体的火灾危险性类别判定的合理性进行辨析,建议对火灾危险性类别判定不合理之处进行重新评估并修改相关规范。

关键词：危险货物氧化性物质氧化性固体包装类别火灾危险性类别

Codebook Design and Beam Training for Extremely Large-Scale RIS:Far-Field or Near-Field?

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China Communications 2022年第6期19卷 193-204页

作者： Xiuhong Wei Linglong Dai Yajun Zhao guanghui yu Xiangyang Duan Beijing National Research Center for Information Science and Technology(BNRist)as well as the Department of Electronic Engineering Tsinghua UniversityBeijing 100084China ZTE Corporation Shenzhen 518038China

Reconfigurable intelligent surface(RIS)is more likely to develop into extremely large-scale RIS(XL-RIS)to efficiently boost the system capacity for future 6 G *** training is an effective way to acquire channel state information(CSI)for *** beam training schemes rely on the far-field ***,due to the large aperture of XL-RIS,the scatters are more likely to be in the near-field region of *** far-field codebook mismatches the near-field channel ***,the existing far-field beam training scheme will cause severe performance loss in the XL-RIS assisted nearfield *** solve this problem,we propose the efficient near-field beam training schemes by designing the near-field codebook to match the nearfield channel ***,we firstly design the near-field codebook by considering the near-field cascaded array steering vector of ***,the optimal codeword for XL-RIS is obtained by the exhausted training *** reduce the beam training overhead,we further design a hierarchical nearfield codebook and propose the corresponding hierarchical near-field beam training scheme,where different levels of sub-codebooks are searched in turn with reduced codebook *** results show the proposed near-field beam training schemes outperform the existing far-field beam training scheme.

关键词： extremely large-scale RIS near-field codebook design beam training

Risk assessment and binding mechanisms of potentially toxic metals in sediments from different water levels in a coastal wetland

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Journal of Environmental Sciences 2023年第7期129卷 202-212页

作者： Fusheng Sun guanghui yu Xingxing Han Zhilai Chi yunchao Lang Congqiang Liu Institute of Surface-Earth System Science School of Earth System ScienceTianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai RimTianjin UniversityTianjin 300072China

The excessive accumulation of potentially toxic metals(Pb and Cd)in coastal wetlands is among the main factors threateningwetland ***,the effects ofwater table depth(WTD)on the risk and binding mechanisms of potentially toxic metals in sediments remain ***,sediments from different WTD obtained from a typical coastal wetland were evaluated using a newly developed strategy based on chemical extraction methods coupled with high-resolution *** findings indicated that the WTD of the coastal wetland fluctuates frequently and the average enrichment factor for Pb was categorized as minor,whereas Cd enrichment was categorized as ***-resolution spectroscopy techniques also demonstrated that organic functional groups and partly inorganic compounds(e.g.,Fe-O/Si-O)played a vital role in the binding of Pb and Cd to surface ***,mineral components rather than organic groups were mainly bound to thesemetals in the bottom ***,our findings provide key insights into the potential health effects and binding characteristics of potentially toxic metals in sediments,as well as their dynamic behavior under varying sediment depths at a microscale.

关键词： Coastal wetlands Wetland sediment Toxic metals Risk assessment Synchrotron radiation Binding mechanisms

Spatiotemporal optical properties of dissolved organic matter in a sluice-controlled coastal plain river with both salinity and trophic gradients

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Journal of Environmental Sciences 2023年第7期129卷 1-15页

作者： yu Liu yucheng Hu Chengxun yu yuqi Gao Zhenying Liu Khan M.G.Mostofa Siliang Li yumei Hu guanghui yu School of Earth System Science Institute of Surface-Earth System ScienceTianjin UniversityTianjin 300072China Tianjin Hydraulic Science Research Institute Tianjin 300061China School of Environmental Science and Safety Engineering Tianjin University of TechnologyTianjin 300191China School of Mathematics Tianjin UniversityTianjin 300072China

Due to the combined effect of sluices and sea tide,the sluice-controlled coastal plain river would be characterized by both trophic state and salinity gradients,affecting the spatiotemporal optical properties of dissolved organicmatter(DOM).In this study,we investigated the spatiotemporal variation of water quality parameters and optical properties of DOM in the Haihe River,a representative sluice-controlled coastal plain river in Tianjin,China.A significant salinity gradient and four trophic states were observed in the water body of the Haihe *** humic-and one protein-like substances were identified from the DOM by the three-dimensional fluorescence spectra combined with the parallel factor(PARAFAC)***’s correlation analysis and redundancy analysis(RDA)showed that the salinity significantly affected the abundance of chromophoric DOM(CDOM)but did not cause significant changes in the fluorescence optical *** addition,the effect of Trophic state index(TSI)on the CDOM abundance was greater than that on the fluorescence intensity of fluorescent dissolved organic matter(FDOM).In the water body with both salinity and trophic state gradients,TSI posed a greater influence than salinity on the CDOM *** results fill the research gap in spatiotemporal DOM characteristics and water quality variation in water bodies with both salinity and trophic state *** results are beneficial for clarifying the joint influence of saline intrusion and sluices on the DOM characteristics and water quality in sluice-controlled coastal plain rivers.

关键词： Dissolved organic matter Optical characteristics Trophic state index Salinity gradient Haihe River Sluice-controlled coastal plain river

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面向6G的QC-LDPC码

移动通信 2024年第5期48卷 37-42页

作者：程义超李立广许进郁光辉中兴通讯股份有限公司广东深圳518055 移动网络和移动多媒体技术国家重点实验室广东深圳518055

在各无线通信标准中,如Wi-Fi、WiMAX和5G标准等,都采用了QC-LDPC码作为数据信道的纠错编码方案。QCLDPC码的译码具有较高并行度,非常适合于高数据传输速率的通信系统。目前5G的QC-LDPC码虽然可以满足上行10 Gbps和下行20 Gbps的峰值速... 详细信息

在各无线通信标准中,如Wi-Fi、WiMAX和5G标准等,都采用了QC-LDPC码作为数据信道的纠错编码方案。QCLDPC码的译码具有较高并行度,非常适合于高数据传输速率的通信系统。目前5G的QC-LDPC码虽然可以满足上行10 Gbps和下行20 Gbps的峰值速率需求。然而,面对未来6G无线移动通信系统对超过100 Gbps峰值速率的迫切需求,现有QC-LDPC编码正面临着前所未有的挑战。鉴于此,基于迭代阈值和距离上限等设计新QC-LDPC码,其最大提升值为1024,对应的基础矩阵兼容5G-BG1,可以兼容5G的译码方法。仿真结果表明,新LDPC码具有更高的译码吞吐量和更低的差错平层性能。

关键词： 6G QC-LDPC 迭代阈值距离上限基础矩阵提升值

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肝脏黏液性囊性肿瘤的MRI特征及分型

中国医学计算机成像杂志 2024年第1期30卷 53-58页

作者：刘林成周志厚于广会陈伶俐曾蒙苏王明亮日照市人民医院影像科山东第一医科大学(山东省医学科学院)放射学院医学影像诊断教研室复旦大学附属中山医院病理科复旦大学附属中山医院放射科(上海市老年医学中心放射科)

目的:探讨肝脏黏液性囊性肿瘤的MRI特征及分型。方法:回顾性分析复旦大学附属中山医院和日照市人民医院2010年6月至2023年1月经病理证实的55例肝脏黏液性囊性肿瘤患者的资料,图像分析包括病灶的位置、边界、数目、大小、形态、有无分隔... 详细信息

目的:探讨肝脏黏液性囊性肿瘤的MRI特征及分型。方法:回顾性分析复旦大学附属中山医院和日照市人民医院2010年6月至2023年1月经病理证实的55例肝脏黏液性囊性肿瘤患者的资料,图像分析包括病灶的位置、边界、数目、大小、形态、有无分隔、壁结节、有无胆管扩张、囊壁及囊腔在T1WI、T2WI、DWI及ADC图像上的信号特征,病灶的囊壁、分隔及壁结节的强化特点,根据形态学特点分为微囊型、寡囊型、混合型3组,分析3组病灶的MRI特征差异有无统计学意义。结果:55例患者中有55个病灶,所有病灶均为单发,微囊型6例,寡囊型20例,混合型29例,病灶大小为1.6~23(8.8±4.7)cm;3组间在病灶大小、有无壁结节的比较差异有统计学意义(P0.05)。结论:不同类型的肝脏黏液性囊性肿瘤的MRI表现有一定的特征,MRI有助于该病的诊断与鉴别诊断。

关键词：肝脏黏液性囊性肿瘤分型磁共振成像

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某燃机转子现场动平衡异常原因分析及处理

东方汽轮机 2024年第1期 71-74页

作者：黄琪于光辉王伟戌卢中俊东方电气集团东方汽轮机有限公司四川德阳618000

文章针对某燃机平衡过程发生的异常原因进行分析,经故障原因排查,是由于TDM测量显示的相位数据异常所致,针对该问题,提出了相应的分析处理方案,处理后效果优良。处理经验对后续机组同类型故障的分析、处理及预防具有一定借鉴意义。

关键词：燃气轮机发电机组现场动平衡振动

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