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Prediction model of surface integrity characteristics in ball end milling TC17 titanium alloy

Advances in Manufacturing 2023年第3期11卷 541-565页

作者： Xue-hong Shen chang-feng yao Liang Tan Ding-Hua Zhang Key Laboratory of High Performance Manufacturing for Aero Engine Ministry of Industry and Information TechnologySchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationSchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China

Surface integrity is important to improve the fatigue property of *** selection of the cutting parameters is extremely important in ensuring high surface *** this paper,ball end milling of TC17 alloy has been carried out utilizing response surface *** effects of cutting speed,feed per tooth,cutting depth,and cutting width on the surface integrity characteristics,including surface roughness(R_(a)),surface topography,residual stress,and microstructure were ***,predictive metamodels for surface roughness,residual stress,and microhardness as a function of milling parameters were *** to the experimental results obtained,the surface roughness increases with the increase of milling parameters,the(R_(a))values vary from 0.4μm to 1.2μm along the feed direction,which are much lower compared to that along the pick feed *** surface compressive residual stress increases with the increase of feed per tooth,cutting depth,and cutting width,while that decreases at high cutting *** depth of the compressive residual stress layer is mostly in the range of 25-40μ*** milled surface microhardness represents 6.4% compared with the initial state;the work-hardened layer depth is approximately 20μ***,plastic deformation and strain streamlines are observed within 3μm depth beneath the *** empirical model of surface integrity characteristics is developed using the results of ten experiments and validated by two extra *** prediction errors of the three surface integrity characteristics are within 27%;the empirical model of microhardness has the lowest prediction errors.

关键词： Prediction model Surface roughness(R_(a)) Residual stress Microhardness Microstructure

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Effect of ultrasonic impact treatment on the surface integrity of nickel alloy 718

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Advances in Manufacturing 2021年第1期9卷 160-171页

作者： Zheng Zhou chang-feng yao Yu Zhao Yang Wang Liang Tan Key Laboratory of High Performance Manufacturing for Aero Engine Ministry of Industry and Information TechnologySchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationSchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China

Ultrasonic impact treatment(UIT)is a type of surface strengthening technology that can improve the fatigue properties of materials by improving the surface quality,residual stress,and other *** this study,the influence of ultrasonic impact parameters on the surface integrity of nickel alloy 718 was *** micro stress concentration caused by the surface morphology was also *** cosine and exponential decay functions were used to fit and characterize the distribution of residual stress and work hardening in the surface *** results showed that the feed rate had the greatest influence on surface roughness,stress concentration,and surface residual *** was not appropriate to evaluate the surface hardening effect only by the number of impacts per unit area,the ultrasonic impact parameters such as feed speed and pre extrusion depth should also be *** grain refinement was obvious after *** multiobjective optimization of machining parameters was performed with the objective of surface stress concentration and residual stress.A surface with a smaller surface stress concentration factor and larger compressive residual stress can be obtained simultaneously using medium linear velocity,medium pre extrusion depth,and smaller feed rate.

关键词： Nickel alloy 718 Ultrasonic impact Surface stress concentration Surface integrity Grain refinement

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Experimental study on surface integrity refactoring changes of Ti-17 under milling-ultrasonic rolling composite process

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Advances in Manufacturing 2023年第3期11卷 492-508页

作者： Zheng Zhou chang-feng yao Liang Tan Ya Zhang Yi Fan Key Laboratory of High Performance Manufacturing for Aero Engine Ministry of Industry and Information TechnologySchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationSchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China

Ultrasonic rolling is an advanced non-cutting surface strengthening method that combines traditional rolling with ultrasonic *** this research,the experiment of orthogonal end milling-ultrasonic rolling composite process has been carried *** surface integrity refactoring changes and its mechanism of Ti-17 titanium alloy during the milling-ultrasonic rolling composite process has been studied and analyzed by the test and analysis of the surface geometric characteristics,residual stress,microhardness and microstructure before and after ultrasonic *** residual stress and microhardness gradient distribution were characterized by cosine decay function and exponential decay *** indicators of surface integrity were significantly improved after ultrasonic *** study demonstrates that the reduction effect of the surface roughness by ultrasonic rolling process is inversely proportional to the initial surface roughness *** ultrasonic rolling can only change the distribution form of the surface topography when the initial surface roughness is *** addition,the improvement effect of ultrasonic rolling on surface compressive residual stress and microhardness decreased with the increase of initial milled surface roughness and surface compressive residual stress due to the factors such as energy absorption efficiency and mechanical properties changes of surface materials.A better ultrasonic rolled surface can be obtained by controlling the roughness and residual compressive stress of the initial milling surface to a small level.

关键词： Ti-17 End milling Ultrasonic rolling Surface integrity Refactoring changes

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Three-dimensional modeling and reconstructive change of residual stress during machining process of milling, polishing, heat treatment, vibratory finishing, and shot peening of fan blade

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Advances in Manufacturing 2021年第3期9卷 430-445页

作者： Ji-Yin Zhang chang-feng yao Min-Chao Cui Liang Tan Yun-Qi Sun Key Laboratory of High Performance Manufacturing for Aero Engine Northwestern Polytechnical UniversityMinistry of Industry and Information TechnologyXi’an710072People’s Republic of China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Northwestern Polytechnical UniversityMinistry of EducationXi’an710072People’s Republic of China

Residual stress during the machining process has always been a research hotspot,especially for aero-engine *** three-dimensional modeling and reconstructive laws of residual stress among various processes in the machining process of the fan blade is studied in this *** fan blades of Ti-6Al-4V are targeted for milling,polishing,heat treatment,vibratory finishing,and shot *** surface and subsurface residual stress after each process is measured by the X-ray diffraction *** distribution of the surface and subsurface residual stress is *** Rational Taylor surface function and cosine decay function are used to fit the characteristic function of the residual stress distribution,and the empirical formula with high fitting accuracy is *** value and distribution of surface and subsurface residual stress vary greatly due to different processing *** reconstructive change of the surface and subsurface residual stress of the blade in each process intuitively shows the change of the residual stress between the processes,which has a high reference significance for the research on the residual stress of the blade processing and the optimization of the entire blade process.

关键词： Fan blade Machining process Surface residual stress Subsurface residual stress Three-dimensional modeling Reconstructive change

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Mainchain conformation ordering self-assembly tailored room temperature phosphorescence emission

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Science China Chemistry 2025年第1期68卷 329-336页

作者： Yuzhu Li Yumeng Gao feng Tian Yu Wang Yuan yao Shaoliang Lin Xiang Ma Binbin Xu Shanghai Key Laboratory of Advanced Polymeric Materials Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Key Laboratory for Advance Materials and Feringa Noble Prize Scientist Joint Research Centre Frontiers Science for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science & Technology

Developing organic room-temperature phosphorescence （RTP） materials with a wide range of tunable-emission is significant in expanding the applications of RTP ***,we rationally designed amphiphilic alternating copolymers poly(1,2-bis（4-alkoxyphenyl）ethane-1,2-dione-alt-（ethylene glycol）x)(P（Bz-alt-EGx）) that combined the advantage of alternating benzil and EGxskeleton,and tunable mainchain *** a mainchain conformation ordering assembly （COA） process,P（Bz-alt-EGx） self-assembled into well-defined platelets,and such assemblies emitted blue RTP at ca.425 nm due to the ordered folded-chain conformation and confined *** contrast,traditional self-assembly （TA） of P（Bz-alt-EGx） obtained less ordered aggregates,such as asymmetric worms,vesicles,and rod-like *** resultant less ordered aggregates exhibited yellow-green RTP at ca.550 *** wide-tuning RTP emission in solution （between blue and yellow-green,over125 nm） is realized using the P（Bz-alt-EGx） alternating copolymers under the treatment of different self-assembly *** study uncovers a new strategy to tailor the RTP emission through different self-assembly pathways and holds great promise for the fabrication of advanced optical materials.

关键词： self-assembly conformation ordering alternating copolymer phosphorescence emission

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Recent progress on photoactive nonprecious transition-metal complexes

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Science China Chemistry 2025年第1期68卷 46-95页

作者： Zhong-Liang Gong Hong-Jie Zhang Yan Cheng Jianxun Liu Yuhan Ai Yaqin Li Zhihui feng Qiong Zhang Shaolong Gong Yong Chen chang-Jiang yao Yuan-Yuan Zhu Liang-Jin Xu Yu-Wu Zhong CAS Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences State Key Laboratory of Structural Cemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences School of Chemistry and Chemical Engineering Anhui Key Laboratory of Advanced Catalytic Materials and Reaction EngineeringHefei University of Technology State Key Laboratory of Explosion Science and Safety Protection School of Mechatronical Engineering Beijing Institute of Technology College of Chemistry and Molecular Sciences Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Wuhan University School of Chemistry and Chemical Engineering Anhui University Key Laboratory of Photochemical Conversion and Optoelectronic Materials & CAS-HKU Joint Laboratory on New Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences

Photoactive complexes of nonprecious transition metals, mainly including those in the first-row and partially the second-row of the Periodic table of elements, have received increasing attention in view of their low cost and long-term sustainability. They are recognized as promising alternatives to noble transition metal complex congeners that have been extensively studied in optoelectronic devices, artificial photosynthesis, photocatalysis, biodiagnostics, and therapeutics, etc. This review is devoted to a comprehensive summary on the classical and recent advances on photoactive nonprecious transition metal complexes, including photoactive Zr, V, Cr, Mo, and W complexes, Mn complexes and hybrids, Fe, Co, Ni, and Cu complexes, and Zn and Cd complexes and hybrids. A particular focus is given on the molecular design, modulation of photophysical and photochemical properties, and applications of the representative and lately-developed nonprecious metal complexes. In addition, a perspective on the future development in this field is provided at the end of this review.

关键词： photoactive metal complexes earth-abundant metals nonprecious metal complexes luminescence photochemistry

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An Efficient Boron Source Activation Strategy for the Low‑Temperature Synthesis of Boron Nitride Nanotubes

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Nano-Micro Letters 2025年第1期17卷 548-558页

作者： Ying Wang Kai Zhang Liping Ding Liyun Wu Songfeng E Qian He Nanyang Wang Hui Zuo Zhengyang Zhou feng Ding Yue Hu Jin Zhang Yagang yao National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional Materialsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093People’s Republic of China School of Electronic Information and Artificial Intelligence Shaanxi University of Science&TechnologyXian 710000People’s Republic of China College of Bioresources Chemical and Materials Engineering Shaanxi University of Science&TechnologyXian 710000People’s Republic of China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325000People’s Republic of China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518000People’s Republic of China College of Chemical and Molecular Engineering Peking UniversityBeijing 100871People’s Republic of China

Lowering the synthesis temperature of boron nitride nanotubes(BNNTs)is crucial for their *** primary reason for adopting a high temperature is to enable the effective activation of highmelting-point solid *** this study,we developed a novel approach for efficiently activating boron by introducing alkali metal compounds into the conventional MgO–B *** approach can be adopted to form various low-melting-point AM–Mg–B–O growth *** growth systems have improved catalytic capability and reactivity even under low-temperature conditions,facilitating the synthesis of BNNTs at temperatures as low as 850℃.In addition,molecular dynamics simulations based on density functional theory theoretically demonstrate that the systems maintain a liquid state at low temperatures and interact with N atoms to form BN *** findings offer novel insights into the design of boron activation and are expected to facilitate research on the low-temperature synthesis of BNNTs.

关键词： Boron nitride nanotubes Low-temperature Boron activation Density functional theory

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Nanocarrier-mediated siRNA delivery:a new approach for the treatment of traumatic brain injury-related Alzheimer's disease

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Neural Regeneration Research 2025年第9期20卷 2538-2555页

作者： Jie Jin Huajing Zhang Qianying Lu Linqiang Tian Sanqiao yao feng Lai Yangfan Liang Chuanchuan Liu Yujia Lu Sijia Tian Yanmei Zhao Wenjie Ren Institute of Disaster and Emergency Medicine Tianjin UniversityTianjinChina Key Laboratory for Disaster Medicine Technology TianjinChina Henan Medical Key Laboratory for Research of Trauma and Orthopedics The Third Affiliated Hospital of Xinxiang Medical UniversityXinxiangHenan ProvinceChina Clinical Medical Center of Tissue Engineering and Regeneration Xinxiang Medical UniversityXinxiangHenan ProvinceChina Institutes of Health Central Plain Xinxiang Medical UniversityXinxiangHenan ProvinceChina School of Public Health Xinxiang Medical UniversityXinxiangHenan ProvinceChina

Traumatic brain injury and Alzheimer's disease share pathological similarities,including neuronal loss,amyloid-βdeposition,tau hyperphosphorylation,blood-brain barrier dysfunction,neuroinflammation,and cognitive ***,traumatic brain injury can exacerbate Alzheimer's disease-like pathologies,potentially leading to the development of Alzheimer's *** offer a potential solution by facilitating the delive ry of small interfering RNAs across the blood-brain barrier for the targeted silencing of key pathological genes implicated in traumatic brain injury and Alzheimer's disease.U nlike traditional approaches to neuro regeneration,this is a molecula r-targeted strategy,thus avoiding non-specific drug *** review focuses on the use of nanocarrier systems for the efficient and precise delive ry of siRNAs,discussing the advantages,challenges,and future *** principle,siRNAs have the potential to target all genes and non-targetable protein s,holding significant promise for treating various *** the various therapeutic approaches currently available for neurological diseases,siRNA gene silencing can precisely"turn off"the expression of any gene at the genetic level,thus radically inhibiting disease progression;however,a significant challenge lies in delivering siRNAs across the blood-brain *** have received increasing attention as an innovative drug delive ry tool fo r the treatment of brain *** are considered a potential therapeutic strategy with the advantages of being able to cross the blood-brain barrier,targeted drug delivery,enhanced drug stability,and multifunctional *** use of nanoparticles to deliver specific modified siRNAs to the injured brain is gradually being recognized as a feasible and effective *** this strategy is still in the preclinical exploration stage,it is expected to achieve clinical translation in the future,creating a new field of molecular tar

关键词： blood-brain barrier cognitive dysfunction exosomes gene silencing immunotherapy inorganic nanomaterials liposome nanoparticles neuroinflammation polymer nanoparticles stem cells

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不同培养条件厌氧氨氧化颗粒污泥性质及微生物群落结构差异

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环境科学 2020年第5期41卷 2358-2366页

作者：姜滢郭萌蕾谢军祥常尧枫谢嘉玮陈重军沈耀良苏州科技大学环境科学与工程学院苏州215009 江苏水处理技术与材料协同创新中心苏州215009 江苏省环境科学与工程重点实验室苏州215009

采用膨胀颗粒污泥床(EGSB)和上升式厌氧污泥床(UASB)反应器在不同运行条件下培养厌氧氨氧化颗粒污泥,对比分析颗粒污泥性质和微生物群落的差异性.研究表明接种厌氧氨氧化絮状污泥经过EGSB和UASB反应器运行384 d后,均能实现颗粒化,颗粒... 详细信息

采用膨胀颗粒污泥床(EGSB)和上升式厌氧污泥床(UASB)反应器在不同运行条件下培养厌氧氨氧化颗粒污泥,对比分析颗粒污泥性质和微生物群落的差异性.研究表明接种厌氧氨氧化絮状污泥经过EGSB和UASB反应器运行384 d后,均能实现颗粒化,颗粒污泥平均粒径分别达到1.17 mm和1.21 mm,各范围(3 mm)的粒径占比为6.06%、 60.05%、 25.25%和8.64%, 7.40%、 58.90%、 32.04%和1.66%.扫描电镜结果表明不同运行条件下的污泥菌群均以短杆菌、球型菌为主.高通量测序结果表明,Shannon指数EGSB反应器为7.52高于UASB反应器为7.18;变形菌门(Proteobacteria)是两个反应器各阶段污泥的主要菌门,浮霉菌门(Planctomycetes)从接种时的3.30%增到第384d的12.30%(EGSB)和13.30%(UASB).EGSB反应器中的主要厌氧氨氧化菌属为Candidatus Brocadia占7.53%,其次为Candidatus Kuenenia属占1.61%;而在UASB反应器中Candidatus Brocadia属和Candidatus Kuenenia属分别占比为3.69%和7.54%,Candidatus Kuenenia是其优势厌氧氨氧化菌属.优势菌群丰度与环境因子变化存在联系,Candidatus Brocadia丰度与上升流速(v)、氮容积去除负荷(NRR)呈正相关而与水力停留时间(HRT)呈负相关,Candidatus Kuenenia与氮负荷去除率(NRE)、NRR、HRT呈正相关,而与v呈负相关.

关键词：培养条件厌氧氨氧化颗粒污泥性质微生物群落结构

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厌氧氨氧化脱氮除碳功能菌群结构及代谢途径

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中国环境科学 2022年第3期42卷 1138-1145页

作者：常尧枫郭萌蕾谢军祥谢嘉玮陈重军苏州科技大学环境科学与工程学院江苏苏州215009 江苏省环境科学与工程重点实验室江苏苏州215009 江苏水处理技术与材料协同创新中心江苏苏州215009

为明确不同有机物浓度(50~150mg/L)和竹炭同时存在下厌氧氨氧化颗粒污泥系统的脱氮除碳功能菌群结构及代谢途径差异,采用宏基因组测序技术对其微生物分布规律和碳氮代谢基因表达进行了研究.结果表明,当COD浓度为50,150mg/L,添加竹炭显... 详细信息

为明确不同有机物浓度(50~150mg/L)和竹炭同时存在下厌氧氨氧化颗粒污泥系统的脱氮除碳功能菌群结构及代谢途径差异,采用宏基因组测序技术对其微生物分布规律和碳氮代谢基因表达进行了研究.结果表明,当COD浓度为50,150mg/L,添加竹炭显著提升了厌氧氨氧化菌(AnAOB)的相对丰度,Candidatus_Kuenenia的相对丰度分别由2.0%和2.9%增加至1.8%和4.5%.与只添加有机物的对照组相比,添加竹炭的处理组显著改变了微生物群落结构,在炭存在下异化硝酸盐还原为铵(DNRA)细菌丰度下降,反硝化菌属和碳代谢相关菌属丰度增加,说明竹炭的投加有助于维持厌氧氨氧化、反硝化和DNRA3个氮代谢途径群落结构的稳定.微生物共现网络分析表明,不同脱氮菌群的协同作用提高了总氮(TN)的去除率,竹炭可以通过Halomonas的富集提高Candidatus_Brocadia和Candidatus_Jettenia的抗逆性.通过KEGG数据库注释表明,有机物存在条件下竹炭提升了厌氧氨氧化颗粒污泥系统的碳氮代谢效能,尤其促进了糖酵解途径(EMP)与三羧酸循环(TCA cycle)的衔接.

关键词：宏基因组厌氧氨氧化颗粒污泥脱氮除碳菌群结构代谢途径

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