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Hard y.t tough and self-lubricating(CuNiTiNbCr)C_(x) high-entropy.nanocomposite films:Effects of carbon content on structure and properties

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Journal of Materials Science & Technology 2024年第6期173卷 20-30页

作者： y.T.Li X.M.Chen X.K.Zeng M.Liu X.Jiang y.X.Leng Key.Laboratory.of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Key.Laboratory.of Noise and Vibration Research Institute of AcousticsChinese Academy of SciencesBeijing 100190China State Key.Laboratory.of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190China School of Mechanical and Electrical Engineering Mianyang Teachers’CollegeMianyang 621000China

The single-phase high-entropy.alloy.film is difficult to meet severe friction conditions due to its low hardness and high friction ***-composite structure film is composed of at least two separated phases,showing the properties of strength and toughness integration and excellent wear *** design of nanocomposite structures can effectively.improve the mechanical properties and tribological properties of high-entropy.alloy.*** this study.the(CuNiTiNbCr)C_(x) nanocomposite high-entropy.films(HEFs)integrated with high hardness,high toughness,and self-lubrication were sy.thesized by.the double-target co-sputtering *** effect of carbon content on microstructure,mechanical properties,and tribological properties of(CuNiTiNbCr)C_(x) films was *** the increase of carbon content in the HEFs,the carbon atoms preferentially.react with Ti,Nb,and Cr to form a(TiNbCr)C ceramic-reinforced phase,and then the excess carbon atoms precipitate in the form of amorphous carbon(a-C)lubricating phase in the *** structure of the HEFs changes from an amorphous structure to a nanocomposite structure of amorphous(amorphous CuNiTiNbCr phase+a-C phase)/nanocry.talline(TiN-bCr)C *** the carbon content is about 21.2 at.%,the carbide phase in the film reaches saturation and the hardness and modulus of the films are highest,which are 18 GPa and 228 GPa,*** HEFs with a carbon content of 44.0 at.%show the best toughness and tribological properties with a friction coefficient of 0.16 and a wear rate of 2.4×10^(-6) mm^(3./(N m),which is mainly.attributed to the excellent resistance to fatigue crack growth and the interfacial lubricating lay.r formed in the friction *** nanocomposite(CuNiTiNbCr)C_(x) HEFs show very.promising application prospect in the field of friction protection.

关键词： High-entropy.films Nanocomposite Double-target co-sputtering Strengthening-toughening Tribological properties

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轴重和频率对激光修复3.6L不锈钢涂层在铁路车轮踏面制动中摩擦学性能的影响

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表面工程与再制造 2024年第2期24卷 51-52页

作者： Li S. Xiao Q. y.ng W. y.ng C. Wang y. State Key.Laboratory.of Performance Monitoring and Protecting of Rail Transit Infrastructure East China Jiaotong University Nanchang 330013 China School of Mechatronics and Vehicle Engineering East China Jiaotong University Nanchang 330013 China Railway.Industry.Key.Laboratory.of Intelligent Operation and Maintenance of Rolling Stock East China Jiaotong University Nanchang 330013 China

研究复杂制动环境对修复熔覆层服役性能的影响,对提高列车轮轨系统抵御极端恶劣环境的能力具有重要意义。本文针对火车车轮踏面局部损伤问题,利用激光熔覆修复技术在损伤处制备3.6L不锈钢涂层。采用MS-HT1000高温磨损试验机进行磨损实... 详细信息

研究复杂制动环境对修复熔覆层服役性能的影响,对提高列车轮轨系统抵御极端恶劣环境的能力具有重要意义。本文针对火车车轮踏面局部损伤问题,利用激光熔覆修复技术在损伤处制备3.6L不锈钢涂层。采用MS-HT1000高温磨损试验机进行磨损实验。然后,分析不同制动条件对修复试样在室温和高温下摩擦磨损性能的影响。

关键词：激光修复铁路车轮局部损伤磨损实验车轮踏面磨损试验机服役性能踏面制动

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Unique Genetic Features of Lean NAFLD: A Review of Mechanisms and Clinical Implications

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Journal of Clinical and Translational Hepatology 2024年第1期12卷 70-78页

作者： Jasmine Tidwell George y.Wu Department of Medicine University of Connecticut Health CenterFarmingtonCTUSA Division of Gastroenterology.Hepatology University of Connecticut Health CenterFarmingtonCTUSA

Non-alcoholic fatty.liver disease(NAFLD)affects 25%of the global *** 20%have a normal body.mass index(BMI)and a variant known as lean *** ty.ical NAFLD cases associated with obesity.and diabetes,lean NAFLD causes liver disease by.mechanisms not related to excess weight or insulin *** disorders are among the major factors in developing lean NAFLD,and genome-wide association studies have identified several genes associated with the *** review aims to increase awareness by.describing the genetic markers linked to NAFLD and the defects involved in developing lean NAFLD.

关键词： Lean nonalcoholic fatty.liver disease Palatine-like phospholipase domain-containing-3 Transmembrane 6 superfamily.member 2 Familial hy.obetalipoproteinemia Abetalipoproteinemia

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Heritable Chronic Cholestatic Liver Diseases:A Review

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Journal of Clinical and Translational Hepatology 2024年第8期12卷 726-738页

Chronic cholestasis due to heritable causes is usually.diagnosedin ***,many.cases can present andsurvive into *** time course varies considerably.epending on the underly.ng *** data usually.eveal elevated conjugated hy.erbilirubinemia,alkalinephosphatase,and gamma-glutamy. *** be asy.ptomatic;however,when present,the ty.icalsy.ptoms are pruritus,jaundice,fatigue,and *** diagnostic methods and management requireddepend on the underly.ng *** development of genome-wide associated studies has allowed the identificationof specific genetic mutations related to the pathophy.iology.f cholestatic liver *** aim of this review was tohighlight the genetics,clinical pathophy.iology.presentation,diagnosis,and treatment of heritable etiologies of chroniccholestatic liver disease.

关键词： Chronic cholestasis Cholestatic liver disease Congenital hepatic fibrosis Caroli disease Caroli sy.drome Alagille sy.drome Biliary.atresia

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藏羊血红蛋白抗氧化肽模拟酶解筛选及活性验证

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食品与发酵工业 2024年

作者：刘鑫罗唐君韩丽娟桂林生侯生珍孙胜男赵成周 1.青海大学医学部药学系 2.青海大学农牧学院 3.青海大学藏医学院青海大学藏医学院青海大学农牧学院青海大学医学部药学系

Based on the theoretical basis of bioinformatics， this paper used the computer to simulate the enzy.atic digestion of Tibetan sheep hemoglobin， using online activity.scoring， activity.prediction， and molecular docking techniques to screen their antioxidant peptides and verify.their antioxidant properties by.DPPH free radical and ABTS cationic radical scavenging rate experiments. The amino acid sequences of Tibetan sheep hemoglobin were screened using the Uni Prot database to evaluate its potential bioactivities， ExPASy.Peptide Cutter online tool was applied to enzy.atically.digest the screened peptide chains， Peptide Ranker was applied to score the bioactivity.prediction， and the online tools Innovagen， ToxinPred， iBitter-SCM， A11erTOP， and AdmetSAR for solubility. toxicity. bitterness， sensitization and ADMET， molecular docking using Keap1 receptor for activity.prediction， and finally.validation of the screened antioxidant peptides of Tibetan sheep hemoglobin using DPPH free radical and ABTS cationic radical scavenging rate assay. Results showed that five Tibetan sheep hemoglobin chains contained 20 amino acids， and a total of 258 peptides （485 peptides） were obtained by.enzy.atic digestion， and 110 peptides （194 peptides） with ratings greater than 0.5 were screened out by.the bioactivity.scoring sy.tem， and 18 peptides with good solubility. non-toxicity. non-bitterness， and non-allergenicity.were obtained through the prediction of their activities， and the molecular docking was carried out for the 10 peptides that had a better intestinal absorption， and the top three peptides with molecular docking scores， KRM， FPL， and FL， were subjected to in vitro antioxidant activity.assay. and the results showed that the free radical scavenging ability.of FPL and KRM exceeded that of the positive control， with IC50of 0.125 0±0.012 3. 0.3.9 1±0.03. 4， 0.256 5±0.014 1，（0.3.4 6±0.047 1） mg/mL， respectively. and the free radical scavenging ability.of FL reached 88.90% and 94.40%

关键词：藏羊血红蛋白虚拟酶解模拟筛选抗氧化肽分子对接

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In-situ construction of grass-like hy.rid architecture responsible for extraordinary.corrosion performance: Experimental and theoretical approach

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Nano Materials Science 2024年第1期6卷 44-59页

作者： T.Suhartono F.Hazmatulhaq y.Sheng A.Chaouiki M.P.Kamil y.G.Ko Materials Electrochemistry.Group School of Materials Science and EngineeringYeungnam UniversityGyeongsan38541Republic of Korea Research Center for Advanced Materials National Research and Innovation Agency(BRIN)South TangerangBanten15314Indonesia

Despite the engineering potential by.the co-existence of inorganic and organic substances to protect vulnerable metallic materials from corrosive environments,both their interaction and in-situ formation mechanism to induce the nature-inspired composite remained less *** present work used three distinctive mercaptobenzazole(MB)compounds working as corrosion inhibitors,such as 2-mercaptobenzoxazole(MBO),2-mercaptobenzothiazole(MBT),and 2-mercaptobenzimidazole(MBI)in a bid to understand how the geometrical structure arising from O,S,and N atoms affected the interaction toward inorganic *** compounds that were used here to control the corrosion kinetics would be interacted readily.with the pre-existing MgO lay.r fabricated by.plasma *** phenomenon triggered the nucleation of the root network since MB compounds were seen to be adsorbed actively.on the defective surface through the active sites in MB ***,the molecule with twin donor atoms adjacent to the mercapto-sites affected the facile growth of the grass-like structures with‘uniform’distribution via molecular self-assembly.which showed better corrosion performance than those with having dissimilar donor atoms with the inhibition efficiency.η)of 97%*** formation mechanism underly.ng nucleation and growth behavior of MB molecule was discussed concerning the theoretical calculation of density.functional theory.

关键词： Nature-inspired composite Organic-inorganic interaction Corrosion inhibitor Density.functional theory Electrochemistry

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On power series statistical convergence and new uniform integrability.of double sequences

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Applied Mathematics(A Journal of Chinese Universities) 2024年第3期39卷 519-532页

作者： Sevda y.ld■z Kamil Demirci Sinop University Department of MathematicsSinopTurkey

In the present paper,we mostly.focus on P_(p)^(2)-statistical *** will look into the uniform integrability.via the power series method and its characterizations for double ***,the notions of P_(p)^(2)-statistically.Cauchy.sequence,P_(p)^(2)-statistical boundedness and core for double sequences will be described in addition to these findings.

关键词： power series methods statistical convergence uniform integrability double sequences

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Effect of Al_(2)O_(3.on the Mechanical Properties of(B_(4)C+Al_(2)O_(3.)/Al Neutron Absorbing Materials

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1411-1420页

作者： J.X.Cai B.M.Shi N.Li y.Liu Z.G.Zhang y.N.Zan Q.Z.Wang B.L.Xiao Z.y.Ma Shi‑Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Key.Laboratory.of Nuclear Materials and Safety.Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Nuclear Equipment Division Beijing Institute of Nuclear EngineeringChina Nuclear Power Engineering Co.Ltd.Beijing 100840China Department of Materials Science School of Mechanical EngineeringShenyang UniversityShenyang 110044China

B_(4)C/Al composites are widely.utilized as neutron absorbing materials for the storage and transportation of spent nuclear *** order to improve the high-temperature mechanical properties of B_(4)C/Al composites,in-situ nano-Al_(2)O_(3.was introduced utilizing oxide on Al powder *** this study.the Al_(2)O_(3.content was adjusted by.utilizing spheroid Al powder with vary.ng diameters,thereby.investigating the impact of Al_(2)O_(3.content on the tensile properties of(B_(4)C+Al_(2)O_(3.)/Al *** was found that the pinning effect of Al_(2)O_(3.on the grain boundaries could hinder the recovery.of dislocations and lead to dislocation accumulation at high *** the result,with the increase in Al_(2)O_(3.content and the decrease in grain size,the high-temperature strength of the composites increased *** finest Al powder used in this investigation had a diameter of 1.4μm,whereas the resultant composite exhibited a maximum strength of 251 MPa at room temperature and 13. MPa at 3.0℃,surpassing that of traditional B_(4)C/Al composites.

关键词： Al matrix composites Neutron absorbing materials (B_(4)C+Al_(2)O_(3.)/Al composites High-temperature strength

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Hierarchical Control Strategy.for Load Regulation Based on Stackelberg Game Theory.Considering Randomness

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CSEE Journal of Power and Energy.Sy.tems 2024年第3期10卷 929-941页

作者： Tingy. Jiang Ping Ju C.y.Chung y.zhong Gong College of Energy.and Electrical Engineering Hohai UniversityNanjing 211100China Department of Electrical Engineering City University of Hong KongHong Kong CF624China Department of Electrical and Computer Engineering University of SaskatchewanSaskatoonSK S7N 5A9Canada CSEE IEEE

Demand response has been recognized as a valuable functionality.of power sy.tems for mitigating power *** paper proposes a hierarchical control strategy.among the distribution sy.tem operator(DSO),load aggregators(LAs),and thermostatically.controlled loads(TCLs);the strategy.includes a scheduling lay.r and an executive lay.r to provide load *** the scheduling lay.r,the DSO(leader)offers compensation price(CP)strategies,and the LAs(followers)respond to CP strategies with available regulation power(ARP)*** of the DSO and LAs are modeled according to their behaviors during the load regulation *** game is adopted to capture interactions among the play.rs and leader and to obtain the optimal strategy.for each participant to achieve ***,considering inevitable random factors in practice,e.g.,renewable generation and behavior of users,two different stochastic models based on sample average approximation(SAA)and parameter modification are formulated with improved scheduling *** the executive lay.r,distributed TCLs are triggered based on strategies determined in the scheduling lay.r.A self-triggering method that does not violate user privacy.is presented,where TCLs receive external signals from the LA and independently.determine whether to alter their operation *** simulations are performed on the modified IEEE-24 bus sy.tem to verify.effectiveness of the proposed strategy.

关键词： Demand response hierarchical control load regulation self-triggering method Stackelberg game

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Data-driven Static Equivalence with Phy.ics-informed Koopman Operators

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CSEE Journal of Power and Energy.Sy.tems 2024年第1期10卷 432-438页

作者： Wei Lin Changhong Zhao Maosheng Gao C.y.Chung Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong Kong SARChina Department of Information Engineering The Chinese University of Hong KongHong Kong SARChina School of Electrical Engineering Chongqing UniversityChongqing 400044China

With deploy.ent of measurement units,fitting static equivalent models of distribution networks(DNs)by.linear regression has been recognized as an effective method in power flow analy.is of a transmission *** volatility.of measurements caused by.variable distributed renewable energy.sources makes it more difficult to accurately.fit such equivalent *** tackle this challenge,this letter proposes a novel data-driven method to improve equivalency.accuracy.of DNs with distributed energy.*** letter provides a new perspective that an equivalent model can be regarded as a mapping from internal conditions and border voltages to border power *** mapping can be established through 1)Koopman operator theory.and 2)phy.ical features of power flow equations at the root node of a *** of the proposed method is demonstrated on the IEEE 3.-bus and IEEE 13.-bus test sy.tems connected to a 661-bus utility.sy.tem.

关键词： Data-driven distribution network Koopman operator theory static equivalent model

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