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Insights into the mechanism of multiple Cu-doped Co Fe_(2)O_(4)nanocatalyst activated peroxymonosulfate for efficient degradation of Rhodamine B

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Journal of Environmental Sciences 2024年第3期137卷 382-394页

作者： Yuanmin Mo xiaoping zhang School of Environment&Energy South China University of TechnologyGuangzhou Higher Education Mega CentreGuangzhou 510006China The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education Guangzhou 510006China Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling Guangzhou 510006China Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal Guangzhou 510006China

The multiple metal catalyst as a promising nanomaterial has shown excellent activity in the peroxymonosulfate(PMS)activation for pollutant ***,the role of special sites and in-depth understanding of the PMS activation mechanism are not fully *** this study,a Cu-doped CoFe_(2)O_(4)nanocatalyst(0.5CCF)was synthesized by a sol-gel and calcination method,and used for PMS activation to remove Rhodamine B(RhB).The results showed that the Cu doping obviously enhanced the catalytic performance of CoFe_(2)O_(4),with 99.70%of RhB removed by 0.5CCF while 74.91%in the CoFe_(2)O_(4)within 15 *** on the X-ray photoelectron spectroscopy and electrochemical analysis,this could be ascribed to the more low valence of Co and Fe species generated on the 0.5CCF and faster electron transfers occurred in the 0.5CCF due to the Cu *** addition,Cu doping could provide more reaction sites for the 0.5CCF to activate PMS for RhB *** metal species and the surface hydroxyl were the reaction sites of PMS activation,and the surface hydroxyl played an important role in surface-bound reactive species *** the PMS activation,the Cu not only activated PMS to produce reactive oxygen species(ROS),but also regenerated Co^(2+)and Fe^(2+)to accelerate the PMS *** non-radical of ^(1)O_(2)was the main ROS with a 99.35%of contribution rate,and the SO_(5)^(·–)self-reaction was its major *** study provides a new insight to enhance the PMS activation performance of multiple metal catalysts by Cu doping in wastewater treatment.

关键词： Cu-doped CoFe_(2)O_(4)nanocatalyst PMS activation Mechanism Rhodamine B removal

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Experimental study on the influences of cutter geometry and material on scraper wear during shield TBM tunnelling in abrasive sandy ground

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 410-425页

作者： Shaohui Tang xiaoping zhang Quansheng Liu Qi zhang Xinfang Li Haojie Wang Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province School of Civil EngineeringWuhan UniversityWuhan430072China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China

When shield TBM tunnelling in abrasive sandy ground,the rational design of cutter parameters is critical to reduce tool wear and improve tunnelling ***,the influence mechanism of cutter parameters on scraper wear remains unclear due to the lack of a reliable test *** and material optimisation are often based on subjective experience,which is unfavourable for improving scraper geological *** the present study,the newly developed WHU-SAT soil abrasion test was used to evaluate the variation in scraper wear with cutter geometry,material and *** influence mechanism of cutter parameters on scraper wear has been revealed according to the scratch characteristics of the scraper *** geometry and material parameters have been optimised to reduce scraper *** results indicate that the variation in scraper wear with cutter geometry is related to the cutting resistance,frictional resistance and stress *** appropriate increase in the front angle(or back angle)reduces the cutting resistance(or frictional resistance),while an excessive increase in the front angle(or back angle)reduces the edge angle and causes stress *** optimal front angle,back angle and edge angle for quartz sand samples areα=25°,β=10°andγ=55°,*** wear resistance of the modelled scrapers made of different metal materials is related to the chemical elements and *** wear resistances of the modelled scrapers made of 45#,06Cr19Ni10,42CrMo4 and 40CrNiMoA are 0.569,0.661,0.691 and 0.728 times those made of WC-Co,*** the alloy hardness is less than 47 HRC(or greater than 58 HRC),scraper wear decreases slowly with increasing alloy hardness as the scratch depth of the particle asperity on the metal surface stabilizes at a high(or low)***,when the alloy hardness is between 47 HRC and 58 HRC,scraper wear decreases rapidly with increasing alloy hardness as the scratch depth transitions

关键词： Shield TBM Scraper wear Cutter shape Metal material Alloy hardness

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A review of rock macro-indentation:Theories,experiments,simulations,and applications

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2351-2374页

作者： Weiqiang Xie Xiaoli Liu xiaoping zhang Xinmei Yang Xiaoxiong Zhou State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing100084China Yunlong Lake Laboratory of Deep Underground Science and Engineering Xuzhou221116China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan430072China

Rock macro-indentation plays a fundamental role in mechanical rock breaking for various rock engineering application,such as drilling,tunneling,cutting,and *** the past decades,extensive research has been conducted to understand the indentation mechanisms and responses through various *** review aims to provide an overview of the current status and recent advancements in theories,experiments,numerical simulations,and applications of macro-indentation in rock *** starts with elaborating on the mechanisms of macro-indentation,followed by a discussion of the merits and limitations of commonly used *** factors and their effects on indentation test results are then *** numerical simulation methods for rock macro-indentation are highlighted,along with their advantages and ***,the applications of indentation tests and indentation indices in characterizing rock properties are *** reveals that compression-tension,compression-shear,and composite models are widely employed in rock *** the compression-tension model is straightforward to use,it may overlook the anisotropic properties of *** the other hand,the composite model provides a more comprehensive description of rock indentation but requires complex ***,factors,such as indentation rate,indenter geometry,rock type,specimen size,and confining pressure,can significantly influence the indentation *** methods for macro-indentation encompass continuous medium,discontinuous medium,and continuous-discontinuous medium methods,with selection based on their differences in ***,rock macro-indentation can be practically applied to mining engineering,tunneling engineering,and petroleum drilling *** indices serve as valuable tools for characterizing rock strength,brittleness,and *** review sheds light on the development of rock macro-inde

关键词： Rock macro-indentation Indentation test Indentation indices Mechanism Rock breaking

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3D printedβ-sheet-reinforced natural polymer hydrogel bilayer tissue engineering scaffold

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Science China(Technological Sciences) 2024年第4期67卷 1170-1184页

作者： ZHAO XinRui NIE XiongFeng zhang xiaoping SUN YaGe YANG Rong BIAN XinYu zhang Qian WANG HongYing XU ZiYang LIU WenGuang School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin 300350China

It remains a significant challenge to fabricate natural polymer(NP)hydrogels with anti-swelling ability and high strengths in the physiological ***,theβ-sheet-reinforced NP hydrogel is developed by copolymerizing methacrylated gelatin(GelMA)and methacrylated silk fibroin(SFMA)in aqueous solution,followed by ethanol treatment(named GelMA-SFMAAL).Theβ-sheets formed by SFMA can act as a stable physical crosslink to enhance the mechanical properties and prolong the degradation of the GelMA ***,the chemical crosslinking in the GelMA-SFMA hydrogel prevents excessive aggregation of hydrophobicβ-sheets,thereby avoiding the formation of brittle *** obtained GelMA-SFMA-AL hydrogels exhibit considerably enhanced mechanical properties(Young's modulus:0.89–3.68 MPa;tensile strength:0.31–0.96 MPa;toughness:0.09–0.63 MJ/m^(3);compressive modulus:0.78–2.20 MPa;compressive strength:2.65–5.93 MPa)compared with GelMA-SFMA hydrogels(Young's modulus:0.04–0.13 MPa;tensile strength:0.04–0.07 MPa;toughness:0.01–0.02 MJ/m^(3);compressive modulus:0.03–0.09 MPa;compressive strength:0.30–0.64 MPa).A bilayer osteochondral scaffold is constructed via digital light processing(DLP)three-dimensiaonl(3D)printing technology,comprising GelMA-SFMA@diclofenac sodium(DS)-AL as the top layer and GelMA-SFMA@bioactive glass(BG)-AL as the bottom *** bilayer hydrogel scaffold is demonstrated to support cell attachment and spreading,and facilitate osteogenic differentiation of rat bone marrow stem cells in *** vivo implantation experiment suggests this bilayer scaffold is promising to be used for osteochondral tissue regeneration.

关键词： silk fibroin β-sheet high-strength hydrogel natural polymer osteochondral regeneration

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NAT10-mediated ac 4 C-modified ANKZF1 promotes tumor progression and lymphangiogenesis in clear-cell renal cell carcinoma by attenuating YWHAE-driven cytoplasmic retention of YAP1

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Cancer Communications 2024年第3期44卷 361-383页

作者： Daojia Miao Jian Shi Qingyang Lv Diaoyi Tan Chuanyi Zhao Zhiyong Xiong xiaoping zhang Department of Urology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubeiP.R.China Institute of Urology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubeiP.R.China

Background:Lymphatic metastasis is one of the most common metastatic routes and indicates a poor prognosis in clear-cell renal cell carcinoma(ccRCC).N-acetyltransferase 10(NAT10)is known to catalyze N4-acetylcytidine(ac4C)modification of mRNA and participate in many cellular ***,its role in the lymphangiogenic process of ccRCC has not been *** study aimed to elucidate the role of NAT10 in ccRCC lymphangiogenesis,providing valuable insights into potential therapeutic targets for ***:ac4C modification and NAT10 expression levels in ccRCC were assessed using public databases and clinical *** investigations involved manipulating NAT10 expression in cellular and mouse models to study its role in *** insights were gained through a combination of RNA sequencing,mass spectrometry,co-immunoprecipitation,RNA immuno-precipitation,immunofluorescence,and site-specific mutation ***:We found that ac4C modification and NAT10 expression levels increased in ***10 promoted tumor progression and lymphangiogene-sis of ccRCC by enhancing the nuclear import of Yes1-associated transcriptional regulator(YAP1).Subsequently,we identified ankyrin repeat and zinc fin-ger peptidyl tRNA hydrolase 1(ANKZF1)as the functional target of NAT10,and its upregulation in ccRCC was caused by NAT10-mediated ac4C *** analyses demonstrated that ANKZF1 interacted with tyro-sine 3-monooxygenase/tryptophan 5-monooxygenase activation protein epsilon(YWHAE)to competitively inhibit cytoplasmic retention of YAP1,leading to transcriptional activation of pro-lymphangiogenic ***:These results suggested a pro-cancer role of NAT10-mediated acetylation in ccRCC and identified the NAT10/ANKZF1/YAP1 axis as an under-reported pathway involving tumor progression and lymphangiogenesis in ccRCC.

关键词： clear-cell renal cell carcinoma N4-acetylcytidine N-acetyltransferase 10 YAP1 nuclear import

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采用变滞环PWM的开关磁阻电机直接瞬时转矩控制方法

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机械科学与技术 2024年第5期43卷 858-864页

作者：张文港张小平湖南科技大学海洋矿产资源探采装备与安全技术国家地方联合工程实验室湖南湘潭411201 湖南科技大学信息与电气工程学院湖南湘潭411201

针对基于传统直接瞬时转矩控制的开关磁阻电机因采用固定滞环控制而存在转矩脉动仍然较大的问题,提出一种基于变滞环PWM的直接瞬时转矩控制方法。通过确定开关磁阻电机各相对应的工作区间,建立各区间相应的滞环函数并对函数中各参数进... 详细信息

针对基于传统直接瞬时转矩控制的开关磁阻电机因采用固定滞环控制而存在转矩脉动仍然较大的问题,提出一种基于变滞环PWM的直接瞬时转矩控制方法。通过确定开关磁阻电机各相对应的工作区间,建立各区间相应的滞环函数并对函数中各参数进行优化,根据所得优化后的滞环函数及开关磁阻电机当前转子位置角以及相应的转矩偏差,提出采用变滞环PWM控制方法对其功率变换电路中相应功率开关进行控制,以达到对其转矩脉动进行抑制的目的,最后对其效果进行了仿真验证,同时与传统基于固定滞环的直接瞬时转矩控制方法进行了对比分析,结果表明:该方法不仅显著降低了开关磁阻电机的转矩脉动,而且有效提高了其运行效率,因而具有较好的应用价值。

关键词：开关磁阻电机直接瞬时转矩控制变滞环函数转矩脉动抑制

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论小说《奥菲奥》的分形叙事

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山东外语教学 2024年第1期45卷 75-83页

作者：张小平陈颖扬州大学外国语学院江苏扬州225007

作为混沌理论的重要范畴,“分形”强调事物跨尺度的自相似性与重复对称性。当代美国作家理查德·鲍尔斯的小说《奥菲奥》巧妙运用这一混沌理论的重要范畴,在叙事内容与叙事结构上呈现独特的分形叙事特征。分形叙事不仅使得小说文本呈现... 详细信息

作为混沌理论的重要范畴,“分形”强调事物跨尺度的自相似性与重复对称性。当代美国作家理查德·鲍尔斯的小说《奥菲奥》巧妙运用这一混沌理论的重要范畴,在叙事内容与叙事结构上呈现独特的分形叙事特征。分形叙事不仅使得小说文本呈现出多层次多维度的复杂分形构型,使得小说成了一张动态而又整体的“混沌”之“网”,还有机地勾连了文学与艺术、历史与现实、想象与回忆,表征出一定程度的暗恐审美效应。《奥菲奥》通过小说人物对自由的向往和追求却最终走向悲剧人生的书写,披露了美国的反恐真相,表现出作家对后“9·11”时代深陷反恐阴影下美国社会的忧思。

关键词：理查德·鲍尔斯《奥菲奥》分形后“9·11”

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文化资本视域下职业教育吸引力问题研究

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职教论坛 2024年第4期40卷 113-119页

作者：刘扬军张小萍江西科技师范大学期刊社江西南昌330038 景德镇学院人文学院江西景德镇333400

《国家职业教育改革实施方案》虽然确立了职业教育的类型地位,但职业教育吸引力不足仍是当前我国职业教育高质量发展过程中的现实。从社会学视角来看,文化资本与职业教育吸引力之间存在正相关关系,文化资本的缺失会从职业地位、经济收... 详细信息

《国家职业教育改革实施方案》虽然确立了职业教育的类型地位,但职业教育吸引力不足仍是当前我国职业教育高质量发展过程中的现实。从社会学视角来看,文化资本与职业教育吸引力之间存在正相关关系,文化资本的缺失会从职业地位、经济收入和个人发展三个方面对职业教育吸引力产生巨大的消极影响,故提升文化资本是增强职业教育吸引力的内在因素。关于职业教育吸引力的问题主要涉及国家、学校与社会等层面,因此通过加强职业教育法规和制度建设、深化职业学校教育改革、建立健全职业学校服务机制及关注学生全面发展和个性需求来提升职业教育的制度文化、质量文化、服务文化和人本文化等文化资本,是增强职业教育吸引力的基本途径。

关键词：职业教育吸引力文化资本教育类型制度文化质量文化

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Triplex-structure based DNA circuits with ultra-low leakage and high signal-to-noise ratio

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Chinese Chemical Letters 2024年第1期35卷 465-470页

作者： Huan Liu Zhihao Ming Yuanpeng zhang Qidong Xia Hao Hu Ruijie Liu Yuheng Liao Yizhou Liu Xiao Liu xiaoping zhang Longjie Li Shaogang Wang Xianjin Xiao Institute of Reproductive Health Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department and Institute of Urology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department and Institute of Urology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China School of Life Science and Technology Wuhan Polytechnic UniversityWuhan 430030China Department of Laboratory Medicine Tongji hospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

DNA circuits are powerful tools in various applications such as logical computation,molecular diagnosis and synthetic *** is a major problem in constructing complex DNA *** directly affects the output signal and harms the circuit’s performance *** the traditional DNA circuits,the gate complex is a duplex *** are insufficient energy barriers to prevent spontaneous detachment of strands,resulting in a leak ***,we have developed triplex-structure based DNA circuit with ultra-low leakage and high signal-to-noise ratio(SNR).The triplex structure improves the stability in the absence of *** the same time,the driving force of the strand displacement cascades reduces the influence of the triplex structure on the desired *** SNR of the DNA circuit was increased to 695,while the desired reaction rate remained 90%of the conventional translator *** triplex-structure mediated leakage prevention strategy was further tested at different temperatures and in DNA translator and seesaw *** also constructed modular basic logic gates with a high efficiency and low *** this basis,we further constructed triplex-structure based tertiary DNA logic circuits,and the SNR reached 295,which,to the best of our knowledge,was among the highest of the *** believe that our scheme provides a novel,valid,and general tool for reducing leakages,and we anticipate that it will be widely adopted in DNA nanotechnology.

关键词： Leakage DNA strand displacement cascades Triplex DNA circuits Molecular programming

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基于定子槽结构优化的交流牵引电机电磁降噪设计方法

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兵器装备工程学报 2024年第2期45卷 37-45页

作者：傅搏龚俊张小平湖南科技大学海洋矿产资源探采装备与安全技术国家地方联合工程实验室湖南湘潭411021 湖南科技大学信息与电气工程学院湖南湘潭411021

针对交流牵引电机存在电磁噪声过大的问题,提出一种基于定子槽结构优化的电磁降噪设计方法。在分析交流牵引电机产生电磁噪声机理的基础上,针对其定子槽底部开槽降噪的具体设计方法及其开槽位置与槽口参数优化展开了研究。通过技术验证... 详细信息

针对交流牵引电机存在电磁噪声过大的问题,提出一种基于定子槽结构优化的电磁降噪设计方法。在分析交流牵引电机产生电磁噪声机理的基础上,针对其定子槽底部开槽降噪的具体设计方法及其开槽位置与槽口参数优化展开了研究。通过技术验证,同时对开槽处理前后进行了对比分析,结果表明:采用所提出的交流牵引电机定子槽结构优化方法在保持效率不变的情况下对电磁降噪具有显著效果。

关键词：交流牵引电机电磁降噪定子槽结构优化参数优化

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