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Study on Chaotic Characteristics of the Friction Process between High Hardness Alloy Steel and Cemented Carbide under C60 Nanoparticle Fluid Lubrication

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工程与科学中的计算机建模(英文) 2024年第1期138卷 525-550页

作者： j.ngshan Huang Bin yao Qixin Lan Zhirong Pan School of Aerospace Engineering Xiamen UniversityXiamen361005China

Friction and wear phenomenon is a complex nonlinear system,and it is also a significant problem in the process of metal *** order to systematically analyze the friction and wear process of tool material-workpiece material friction pair in the cutting process of high hardness alloy steel under different lubrication conditions,the chaotic characteristics of friction process between high hardness alloy steel and cemented carbide under the lubrication C60 nano-particles fluid are studied based on the chaos ***,the friction and wear experiments of the friction pair between high hardness alloy steel and cemented carbide tool are carried out based on the ring-block friction and wear tester,and the results of friction force signal in time domain and wear width are ***,the friction signals in time domain are processed and transformed based on phase space reconstruction and recurrence plot theory,and the recurrence plots of different experimental groups under different lubrication conditions are *** evolution law of recurrence plot is further observed and studied,and the recursive quantitative index is ***,the cutting experiments of tool wear are carried *** results show that the proposed method can intuitively and accurately reveal the wear evolution process and the wear feature identification law of the tool material-high hardness alloy steel pair under different lubrication ***,it is found that when the concentration of C60 nanoparticles is 200∼300 ppm,the stability of the friction pair system is *** proposed method can provide a strategy for wear prediction in cutting process,and provide a theoretical basis and technical support for antifriction lubrication methods in practical cutting applications.

关键词： C60 nanoparticles recurrence plot friction stability

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Activation of the wnt/β-catenin/CYP1B1 pathway alleviates oxidative stress and protects the blood-brain barrier under cerebral ischemia/reperfusion conditions

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Neural Regeneration Research 2024年第7期19卷 1541-1547页

作者： Xingyong Chen Nannan yao Yanguang Mao Dongyun Xiao Yiyi Huang Xu Zhang Yinzhou Wang Department of Neurology Fujian Provincial HospitalShengli Clinical Medical College of Fujian Medical UniversityFuzhouFujian ProvinceChina Department of Neurology Cangzhou Central HospitalCangzhouHebei ProvinceChina Fuj.an Academy of Medical Science FuzhouFujian ProvinceChina Key Testing Laboratory of Fuj.an Province FuzhouFujian ProvinceChina

Accumulating evidence suggests that oxidative stress and the Wnt/β-catenin pathway participate in stroke-induced disruption of the blood-brain ***,the potential links between them following ischemic stroke remain largely *** present study found that cerebral ischemia leads to oxidative stress and repression of the Wnt/β-catenin ***,Wnt/β-catenin pathway activation by the pharmacological inhibito r,TWS119,relieved oxidative stress,increased the levels of cytochrome P4501B1(CYP1B1)and tight j.nction-associated proteins(zonula occludens-1[ZO-1],occludin and claudin-5),as well as brain microvascular density in cerebral ischemia *** r,rat brain microvascular endothelial cells that underwent oxygen glucose deprivation/reoxygenation displayed intense oxidative stress,suppression of the Wnt/β-catenin pathway,aggravated cell apoptosis,downregulated CYP1B1and tight j.nction protein levels,and inhibited cell prolife ration and *** ofβ-catenin or knockdown ofβ-catenin and CYP1B1 genes in rat brain mic rovascular endothelial cells at least partly ameliorated or exacerbated these effects,*** addition,small interfering RNA-mediatedβ-catenin silencing decreased CYP1B1 expression,whereas CYP1B1 knoc kdown did not change the levels of glycogen synthase kinase 3β,Wnt-3a,andβ-catenin proteins in rat brain microvascular endothelial cells after oxygen glucose deprivatio n/***,the data suggest that CYP1B1 can be regulated by Wnt/β-catenin signaling,and activation of the Wnt/β-catenin/CYP1B1 pathway contributes to alleviation of oxidative stress,increased tight j.nction levels,and protection of the blood-brain barrier against ischemia/hypoxia-induced inj.ry.

关键词： blood-brain barrier CYP1B1 oxidative stress oxygen glucose deprivation/reoxygenation tight j.nction vascular endothelial cells Wnt/β-catenin pathway β-catenin

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Growth kinetics of titanium carbide coating by molten salt synthesis process on graphite sheet surface

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International j.urnal of Minerals,Metallurgy and Materials 2024年第8期31卷 1858-1864页

作者： Xiaoyu Shi Chongxiao Guo j.amiao Ni Songsong yao Liqiang Wang Yue Liu Tongxiang Fan State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The synthesis of carbide coatings on graphite substrates using molten salt synthesis(MSS),has garnered significant interest due to its cost-effective *** study investigates the reaction process and growth kinetics involved in MSS,shedding light on key aspects of the *** involvement of Ti powder through liquid-phase mass transfer is revealed,where the diffusion distance and quantity of Ti powder play a crucial role in determining the reaction rate by influencing the C content gradient on both sides of the ***,the growth kinetics of the carbide coating are predominantly governed by the diffusion behavior of C within the carbide layer,rather than the chemical reaction *** analyze the kinetics,the thickness of the carbide layer is measured with respect to heat treatment time and temperature,unveiling a parabolic relationship within the temperature range of 700-1300℃.The estimated activation energy for the reaction is determined to be 179283 j.mol^(-1).These findings offer valuable insights into the synthesis of carbide coatings via MSS,facilitating their optimization and enhancing our understanding of their growth mechanisms and properties for various applications.

关键词： titanium carbide graphite molten salt kinetic analysis

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Single　Frequency　Operation　of　Diode－pumped　Intracavity　Frequency　Doubled　Nd：YAG　Laser　With　Tilted　KTP　Crystal：　Theoretical　Study

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Chinese j.urnal of Lasers 1996年第3期B5卷 199-204页

作者： yao j. Q. YANG j. B. SHENG W.D. ZHENG Y.(Institute of Laser and Opto-electronics, Tian j.n University, Tianj.n 300072, China)ZHENG H. YANG H.G.(Institute of Physics, Academia Sinica, Beij.ng 100080, China) Tianj.n Univ Tianjin China

Ｓｉｎｇｌｅ　Ｆｒｅｑｕｅｎｃｙ　Ｏｐｅｒａｔｉｏｎ　ｏｆ　Ｄｉｏｄｅ－ｐｕｍｐｅｄ　Ｉｎｔｒａｃａｖｉｔｙ　Ｆｒｅｑｕｅｎｃｙ　Ｄｏｕｂｌｅｄ　Ｎｄ：ＹＡＧ　Ｌａｓｅｒ　Ｗｉｔｈ　Ｔｉｌｔｅｄ　ＫＴＰ　Ｃｒｙｓｔａ... 详细信息

Ｓｉｎｇｌｅ　Ｆｒｅｑｕｅｎｃｙ　Ｏｐｅｒａｔｉｏｎ　ｏｆ　Ｄｉｏｄｅ－ｐｕｍｐｅｄ　Ｉｎｔｒａｃａｖｉｔｙ　Ｆｒｅｑｕｅｎｃｙ　Ｄｏｕｂｌｅｄ　Ｎｄ：ＹＡＧ　Ｌａｓｅｒ　Ｗｉｔｈ　Ｔｉｌｔｅｄ　ＫＴＰ　Ｃｒｙｓｔａｌ：　Ｔｈｅｏｒｅｔｉｃａｌ　Ｓｔ...

关键词： single-frequency Nd:YAG laser diode-pumped intracavity frequency Doubling

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Structure and dynamical properties during solidification of liquid aluminum induced by cooling and compression

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Chinese Physics B 2024年第7期33卷 476-481页

作者：吴旻杨永琪王垚 College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China Shaoxing Research Institute Zhejiang University of TechnologyShaoxing 312000China

The structural transformation from a liquid into a crystalline solid is an important subj.ct in condensed matter physics and materials science. In the present study, first-principles molecular dynamics calculations are performed to investigate the structure and properties of aluminum during the solidification which is induced by cooling and compression. In the cooling process and compression process, it is found that the icosahedral short-range order is initially enhanced and then begin to decay, the face-centered cubic short-range order eventually becomes dominant before it transforms into a crystalline solid.

关键词： first-principles method molecular dynamics short-range order liquid aluminum

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Exploring the Cation Regulation Mechanism for Interfacial Water Involved in the Hydrogen Evolution Reaction by In Situ Raman Spectroscopy

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Nano-Micro Letters 2024年第3期16卷 303-312页

作者： Xueqiu You Dongao Zhang Xia‑Guang Zhang Xiangyu Li j.ng‑Hua Tian yao‑Hui Wang j.an‑Feng Li School of Ocean Information Engineering Fujian Provincial Key Laboratory of Oceanic Information Perception and Intelligent ProcessingJimei UniversityXiamen 361021People’s Republic of China State Key Laboratory of Physical Chemistry of Solid Surfaces MOE Key Laboratory of Spectrochemical Analysis and InstrumentationiChEMCollege of Chemistry and Chemical EngineeringCollege of MaterialsCollege of EnergyXiamen UniversityXiamen 361005People’s Republic of China Key Laboratory of Green Chemical Media and Reactions Ministry of EducationCollaborative Innovation Center of Henan Province for Green Manufacturing of Fine ChemicalsCollege of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiang 453007People’s Republic of China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fuj.an Province(IKKEM) Xiamen 361005People’s Republic of China

Interfacial water molecules are the most important participants in the hydrogen evolution reaction(HER).Hence,understanding the behavior and role that interfacial water plays will ultimately reveal the HER ***,investigating interfacial water is extremely challenging owing to the interference caused by bulk water molecules and complexity of the interfacial ***,the behaviors of interfacial water in different cationic electrolytes on Pd surfaces were investigated by the electrochemistry,in situ core-shell nanostructure enhanced Raman spectroscopy and theoretical simulation *** spectral evidence reveals a red shift in the frequency and a decrease in the intensity of interfacial water as the potential is shifted in the positively *** comparing the different cation electrolyte systems at a given potential,the frequency of the interfacial water peak increases in the specified order:Li+j.sting the radius,valence,and concentration of cation to form the two-H down *** unique interfacial water structure will improve the charge transfer efficiency between the water and electrode further enhancing the HER ***,local cation tuning strategies can be used to improve the HER performance by optimizing the interfacial water structure.

关键词： In situ Raman Interfacial water Hydrogen evolution reaction Cations

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Post-acute ischemic stroke hyperglycemia aggravates destruction of the blood-brain barrier

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Neural Regeneration Research 2024年第6期19卷 1344-1350页

作者： Tianqi Xu j.anhong Yang yao Xu Xiaofeng Wang Xiang Gao j.e Sun Chenhui Zhou Yi Huang Department of Neurology The First Affiliated Hospital of Ningbo University Department of General Surgery The First Affiliated Hospital of Ningbo University Department of Neurosurgery The First Affiliated Hospital of Ningbo University Key Laboratory of Precision Medicine for Atherosclerotic Diseases of Zhej.ang Province

Post-acute ischemic stroke hyperglycemia increases the risk of hemorrhagic transformation, which is associated with blood-brain barrier disruption. Brain microvascular endothelial cells are a maj.r component of the blood-brain barrier. Intercellular mitochondrial transfer has emerged as a novel paradigm for repairing cells with mitochondrial dysfunction. In this study, we first investigated whether mitochondrial transfer exists between brain microvascular endothelial cells, and then investigated the effects of post-acute ischemic stroke hyperglycemia on mitochondrial transfer between brain microvascular endothelial cells. We found that healthy brain microvascular endothelial cells can transfer intact mitochondria to oxygen glucose deprivation-inj.red brain microvascular endothelial cells. However, post-oxygen glucose deprivation hyperglycemia hindered mitochondrial transfer and exacerbated mitochondrial dysfunction. We established an in vitro brain microvascular endothelial cell model of the blood-brain barrier. We found that post-acute ischemic stroke hyperglycemia reduced the overall energy metabolism levels of brain microvascular endothelial cells and increased permeability of the blood-brain barrier. In a clinical study, we retrospectively analyzed the relationship between post-acute ischemic stroke hyperglycemia and the severity of hemorrhagic transformation. We found that post-acute ischemic stroke hyperglycemia serves as an independent predictor of severe hemorrhagic transformation. These findings suggest that post-acute ischemic stroke hyperglycemia can aggravate disruption of the blood-brain barrier by inhibiting mitochondrial transfer.

关键词： acute ischemic stroke blood-brain barrier brain microvascular endothelial cells mitochondrial transfer stress hyperglycemia

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Ultraviolet‑Irradiated All‑Organic Nanocomposites with Polymer Dots for High‑Temperature Capacitive Energy Storage

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Nano-Micro Letters 2024年第3期16卷 398-406页

作者： j.ale Ding yao Zhou Wenhan Xu Fan Yang Danying Zhao Yunhe Zhang Zhenhua j.ang Qing Wang College of Chemistry Jilin UniversityChangchun 130012People’s Republic of China Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USAs Deutsches Elektronen-Synchrotron DESY Notkestr.8522607 HamburgGermany

Polymer dielectrics capable of operating efficiently at high electric fields and elevated temperatures are urgently demanded by next-generation electronics and electrical power *** inorganic fillers have been extensively utilized to improved high-temperature capacitive performance of dielectric polymers,the presence of thermodynamically incompatible organic and inorganic components may lead to concern about the long-term stability and also complicate film ***,zero-dimensional polymer dots with high electron affinity are introduced into photoactive allyl-containing poly(aryl ether sulfone)to form the all-organic polymer composites for hightemperature capacitive energy *** ultraviolet irradiation,the crosslinked polymer composites with polymer dots are efficient in suppressing electrical conduction at high electric fields and elevated temperatures,which significantly reduces the high-field energy loss of the composites at 200℃.Accordingly,the ultraviolet-irradiated composite film exhibits a discharged energy density of 4.2 j.cm^(−3)at 200℃.Along with outstanding cyclic stability of capacitive performance at 200℃,this work provides a promising class of dielectric materials for robust high-performance all-organic dielectric nanocomposites.

关键词： High-temperature energy storage Polymer dots Ultraviolet irradiation All-organic composite dielectrics

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Germ cell-specific deletion of Pex3 reveals essential roles of PEX3-dependent peroxisomes in spermiogenesis

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The j.urnal of Biomedical Research 2024年第1期38卷 24-36页

作者： Yej.n yao Baolu Shi Xiangzheng Zhang Xin Wang Shuangyue Li Ying yao Yueshuai Guo Dingdong Chen Bing Wang Yan Yuan j.ahao Sha Xuej.ang Guo State Key Laboratory of Reproductive Medicine and Offspring Health Nanjing Medical UniversityNanjingJiangsu 211166China Reproductive and Genetic Branch the First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui 230001China State Key Laboratory of Reproductive Medicine and Offspring Health Women's Hospital of Nanjing Medical UniversityNanjing Maternity and Child Health Care HospitalNanjing Medical UniversityNanjingJiangsu 211166China.

Peroxisomes are organelles enclosed by a single membrane and are present in various *** abruption of peroxisomes is correlated with peroxisome biogenesis disorders and single peroxisomal enzyme deficiencies that induce diverse diseases in different ***,little is known about the protein compositions and corresponding roles of heterogeneous peroxisomes in various *** transcriptomic and proteomic analyses,we observed heterogenous peroxisomal components among different organs,as well as between testicular somatic cells and different developmental stages of germ *** Pex3 is expressed in both germ cells and Sertoli cells,we generated Pex3 germ cell-and Sertoli cell-specific knockout *** Pex3 deletion in Sertoli cells did not affect spermatogenesis,the deletion in germ cells resulted in male sterility,manifested as the destruction of intercellular bridges between spermatids and the formation of multinucleated giant *** analysis of the Pex3-deleted spermatids revealed defective expressions of peroxisomal proteins and spermiogenesis-related *** findings provide new insights that PEX3-dependent peroxisomes are essential for germ cells undergoing spermiogenesis,but not for Sertoli cells.

关键词： male infertility spermiogenesis peroxisome oxidative stress PEX3

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Toward understanding the microstructure characteristics,phase selection and magnetic properties of laser additive manufactured Nd-Fe-B permanent magnets

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International j.urnal of Extreme Manufacturing 2024年第1期6卷 277-294页

作者： Bo yao Nan Kang Xiangyu Li Dou Li Mohamed EL Mansori j.ng Chen Haiou Yang Hua Tan Xin Lin State Key Laboratory of Solidiffcation Processing Northwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China Arts et Metiers Institute of Technology MSMPHESAM UniversitéF-51006 Chˆalons-en-ChampagneFrance Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China Texas A&M Engineering Experiment Station Institute for Manufacturing SystemsCollege StationTX 77843United States of America

Nd-Fe-B permanent magnets play a crucial role in energy conversion and electronic *** essential magnetic properties of Nd-Fe-B magnets,particularly coercivity and remanent magnetization,are significantly infuenced by the phase characteristics and *** this work,Nd-Fe-B magnets were manufactured using vacuum induction melting(VIM),laser directed energy deposition(LDED)and laser powder bed fusion(LPBF)*** evolution and phase selection of Nd-Fe-B magnets were then clarified in *** results indicated that the solidification velocity(V)and cooling rate(R)are key factors in the phase *** terms of the VIM-casting Nd-Fe-B magnet,a large volume fraction of theα-Fe soft magnetic phase(39.7 vol.%)and Nd2Fe17Bxmetastable phase(34.7 vol.%)areformed due to the low R(2.3×10-1?C s-1),whereas only a minor fraction of the Nd2Fe14B hard magnetic phase(5.15 vol.%)is *** the LDED-processed Nd-Fe-B deposit,although the Nd2Fe14B hard magnetic phase also had a low value(3.4 vol.%)as the values of V(10-2m s-1)and R(1.45×106?C s-1)in the LPBF process resulted in the substantial formation of the Nd2Fe14B hard magnetic phase(55.8 vol.%)directly from the liquid,while theα-Fe soft magnetic phase and Nd2Fe17Bxmetastable phase precipitation are suppressed in the LPBF-processed Nd-Fe-B ***,crystallographic texture analysis reveals that the LPBF-processedNd-Fe-B magnets exhibit isotropic magnetic ***,the LPBF-processed Nd-Fe-B deposit,exhibiting a coercivity of 656 k A m-1,remanence of 0.79 T and maximum energy product of 71.5 k j.m-3,achieved an acceptable magnetic perfor

关键词： laser additive manufacturing(LAM) Nd-Fe-B permanent magnets numerical simulation microstructure magnetic properties

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