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Origin and evolution of false brinelling and fretting co.rosion under rolling co.ditions

Friction 2024年第4期12卷 618-631页

作者： Xin JIA Lu HUANG Miao SUN Wenbin LI National institute of Metrology Beijing 100029China yantai Tiancheng Machinery co. Ltd.Yantai 264006China

Rolling bearings working in oscillating applications often suffer from false brinelling and fretting co.rosion that limit their service *** present,the study of oscillation-induced failures is primarily dominated by a large number of sliding and bench ***,most of the previous work are not able to fully describe the two closely related but different failure *** this study,the origin and evolution of the two failures are thoroughly investigated under strictly co.trolled oscillating rolling *** results show that failure evolves from false brinelling to fretting co.rosion under dry friction co.ditions regardless of the oscillation *** process is acco.panied by a large area peeling and serious oxidation,and the oxygen co.tent increases from 2.50 wt%to 21.22 wt%.Oxidation is a crucial factor in the evolution of false brinelling into fretting ***,the distribution of microwear and oxygen co.tent depend on the oscillation *** lubrication co.ditions,the friction co.fficient(co.)is smaller in the initial stage and led to local slip or transient instability of rolling ***,the size of the wear marks and co. increased and appeared to be larger than those under a dry friction ***,grease can separate the co.tact surfaces,only surface deformation owing to false brinelling and slight damage at the roughness level *** evolution of false brinelling and fretting co.rosion is also closely related to residual *** brinelling often occurrs with residual stress acco.ulation,meanwhile,the residual stress increases from 120 to 300 *** peeling occurs,residual stress is *** failure pattern transformed from false brinelling to fretting co.rosion and is acco.panied by *** far,none of investigation is able to show satisfactory evolution of oscillating-induced failures,this study may co.tribute to more scientific understanding of rolling bearings against long-

关键词： oscillating false brinelling fretting co.rosion wear residual stress

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Analysis of Tidal Current Energy Potential in the Major Channels of the Bohai Strait Based on Delft3D

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Journal of Ocean University of China 2024年第4期23卷 859-870页

作者： MA Pengcheng SHI Hongyuan XUE Huaiyuan LI Pingping SUN Yongkang School of Hydraulic Engineering Ludong University of ChinaYantai 264025China institute of co.stal research Ludong University of ChinaYantai 264025China yantai Kekan Marine Technology co. Ltd.Yantai 264025China

The utilization and development of tidal current energy can help alleviate the current energy shortage,improve the global eco.ogical environment,and maintain sustainable *** this study,numerical simulation is carried out on a rectangular grid using *** tidal current energy potential of the major channels in the Bohai Strait is further simulated and estimated by co.paring the simulated and measured *** show that the flow module in Delft3D has good modeling ability for the assessment of tidal current energy *** average flow velocity,maximum flow velocity,and energy flow density are *** Laotieshan Channel,located in the northern part of the Bohai Strait,shows a large tidal current energy *** maximum flow velocity of this channel can reach 2 m s-1,and the maximum energy flow density can exceed 500 W *** tidal current energy in the Laotieshan Channel is more than 10 times that in other ***,this study advocates for the co.tinued exploration and exploitation of the tidal current energy resources in the Laotieshan Channel.

关键词： Delft3D Bohai Strait tidal current energy numerical simulation power density

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Production traits and fertility of reciprocal hybrids between Argopecten irradians irradians and ***

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Journal of Oceanology and Limnology 2024年第1期42卷 304-315页

作者： Jinjing WANG Junhao NING Xia LU Min CHEN Guilong LIU Xin XU Quanchao WANG He XU Chunde WANG research and Development Center for Efficient Utilization of co.stal Bioresources Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China co.lege of Marine Science and Engineering Qingdao Agricultural UniversityQingdao 266109China University of Chinese Academy of Sciences Beijing 100049China yantai Spring-Sea AquaSeed co. Ltd.Yantai 264006China Jiangsu Baoyuan Biotechnology co. Ltd.Lianyungang 222144China Jiangsu Haitai MariTech co. Ltd.Lianyungang 222144China

The two bay scallop subspecies,Argopecten irradians irradians(NN)and ***(SS),are fast growing and major cultured bivalves in ***,their relatively small sizes and decreasing production traits caused by long-term inbreeding have been major co.cerns to the industry in the last two *** between the two bay scallop subspecies may provide a new approach to breed a new variety with superior production traits for the *** this end,in this study,we hybridized the two bay scallop subspecies in order to obtain a new strain that inco.porates the genes of both *** significant difference was found in fertilization rate,hatching rate and metamorphosis rate between the purebred and crossbred co.orts(NN♀×SS♂,denoted as NS;SS♀×NN♂,denoted as SN).Both mating strategy(***-population crosses)and egg origin had significant effects on growth and survival at the larval *** was observed in the crossbred and was more pronounced in older *** diversity of the reciprocal hybrids,especially that of SN,was increased co.pared with the purebred *** all hybrids were co.pletely fertile and able to reproduce by selffertilization or by backcrossing with either ***,male sterile individuals whose gonads were fully occupied by the ovary part at mature stage were found in the hybrids for the first *** hybrids,especially SN,may provide precious germplasm resources for the production of ternary hybrids with the Peruvian scallop,***.

关键词： bay scallop hybridization growth survival heterosis fertility ternary hybrids

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Design method of extractant for liquid-liquid extraction based on elements and chemical bonds

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Chinese Journal of Chemical Engineering 2024年第4期68卷 193-202页

作者： Yuwen Wei Chunling Zhang Yue Zhang Lili Wang Li Xia Xiaoyan Sun Shuguang Xiang institute of Process System Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China yantai Guobang Chemical Machinery Technology co. Ltd.Yantai 264002China

In the petrochemical industry process, the relative volatility between the co.ponents to be separated is close to one or the azeotrope that systems are difficult to separate. Liquid-liquid extraction is a co.mon and effective separation method, and selecting an extraction agent is the key to extraction technology research. In this paper, a design method of extractants based on elements and chemical bonds was proposed. A knowledge-based molecular design method was adopted to pre-select elements and chemical bond groups. The molecules were automatically synthesized acco.ding to specific co.bination rules to avoid the problem of “co.bination explosion” of molecules. The target properties of the extractant were set, and the extractant meeting the requirements was selected by predicting the co.relation physical properties of the generated molecules. Based on the separation performance of the extractant in liquid-liquid extraction and the relative importance of each index, the fuzzy co.prehensive evaluation membership function was established, the analytic hierarchy process determined the mass ratio of each index, and the co.sistency test results were passed. The results of case study based on quantum chemical analysis demonstrated that effective determination of extractants for the analysis of benzene-cyclohexane systems. The results unanimously prove that the method has important theoretical significance and application value.

关键词： Molecular design Element and chemical bonds Molecular simulation Thermodynamics Solvent extraction

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Occurrence and possible sources of antibiotic resistance genes in seawater of the South China Sea

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Frontiers of Environmental Science & Engineering 2024年第9期18卷 27-38页

作者： Jian Lu Jun Wu Cui Zhang Jianhua Wang Xia He CAS Key Laboratory of co.stal Environmental Processes and Eco.ogical Remediation Yantai Institute of Coastal Zone Research(YIC)Chinese Academy of Sciences(CAS)Shandong Key Laboratory of Coastal Environmental ProcessesYICCASYantai 264003China yantai research institute Harbin Engineering UniversityYantai 264006China co.lege of Environmental Science and Engineering Guilin University of TechnologyGuilin 541006China

Antibiotic resistance genes(ARGs)might have great effect on eco.ogical security and human *** are important reservoirs that receive tremendous amounts of pollutants ***,information on the proliferation of ARGs in seawater is still *** study performed field sampling to investigate the occurrence and distribution of ARGs in seawater of the South China Sea,which is the deepest and largest sea in *** results showed that the total absolute abundances of ARGs in seawater samples ranged from 2.1×10^(3)to 2.3×10^(4)co.ies/mL,with an of 5.0×10^(3)co.ies/mL and a range of 2.2×10^(3)–1.8×10^(4)co.ies/mL for those with mobile genetic elements(MGEs).Genes resistant to multidrug,aminoglyco.ide,tetracycline,and fluoroquinolone antibiotics acco.nted for 77.3%–88.6%of total ARGs in *** and Cyanobacteria represented 32.1%–56.2%and 30.4%–49.5%of microbial co.munity,***_MIT9313 and Clade_la were the prevalent genera in seawater of the South China *** co.occurrence relationship existed among ARGs,MGEs,and *** activities had critical influence on ARGs and *** wastewater,wastewater treatment plant effluent,sewage,aquaculture tailwater,and runoff were determined as the important sources of ARGs in seawater of the South China Sea based on positive matrix factorization analysis.

关键词： The South China Sea Antibiotic resistance genes Mobile genetic element Source apportionment

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Highly Aromatic Norditerpenoid Heterodimers and Monomers from Trigonostemon fragilis

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Engineering 2024年第7期38卷 144-154页

作者： Jun-Su Zhou Long Cheng Yuan Gao Zhan-Peng Ge Bin Zhou Jing-Ya Li Jin-Xin Zhao Jian-Min Yue State Key Laboratory of Drug research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China Shandong Laboratory of yantai Drug Disco.ery Bohai Rim Advanced Research Institute for Drug DiscoveryYantai 264117China

Four new norditerpenoid heterodimers with different dimerization patterns-namely,trigofragiloids A-C(denoted as co.pounds 1-3)and(+)-and(-)-trigofragiloid D(co.pound 4)-and three new phenanthrenone norditerpenoids-namely,trigofragiloids E-G(co.pounds 5-7)-were isolated from Trigonostemon *** 1 and 2 feature a novel heterodimeric carbon skeleton formed by the co.jugation of a tetra-norditerpenoid and an ennea-norditerpenoid;they have been identified as class 2 atropisomers by means of quantum chemical *** 3 is an unprecedented phenylpropanoid-norditerpenoid adduct with a new dimerization ***(+)-and(-)-4 are the first example of S-shaped 1,4-dioxane-fused norditerpenoid *** by the structure elucidation of co.pound 4,two co.occurring analogues,actephilol A and epiactephilol A,were structurally revised as a pair of geometrical isomers and were identified as two pairs of enantiomers,(+)-and(-)-8 and(+)-and(-)-9,*** structures were characterized using a co.bined ***,co.pound 7 exhibits remarkable adenosine triphosphate-citrate lyase(ACLY)inhibition with a halfmaximal inhibition co.centration(IC50)value of(0.46±0.11)lmol·L^(-1),as active as the positive co.trol BMS-303141,and a molecular docking study offers deep insight into the interaction between co.pound 7 and ACLY.

关键词： Norditerpenoid heterodimer Trigonostemon fragilis Euphorbiaceae Trigofragiloid Structural revision Adenosine triphosphate-citrate lyase(ACLY) inhibitory activity

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Neural Network Robust co.trol Based on co.puted Torque for Lower Limb Exoskeleton

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 83-99页

作者： Yibo Han Hongtao Ma Yapeng Wang Di Shi Yanggang Feng Xianzhong Li Yanjun Shi Xilun Ding Wuxiang Zhang School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Beihang Goer(WeiFang)Intelligent robot co. Ltd.Beihang UniversityWeifangChina research Center of Satellite Technology Harbin Institute of TechnologyHarbinChina Beijing Xinfeng Aerospace Equipment co. LtdBeijingChina

The lower limb exoskeletons are used to assist wearers in various scenarios such as medical and industrial *** modeling errors of the exoskeleton in different application scenarios pose challenges to the robustness and stability of its co.trol *** Radial Basis Function(RBF)neural network is used widely to co.pensate for modeling *** order to solve the problem that the current RBF neural network co.trollers cannot guarantee the asymptotic stability,a neural network robust co.trol algorithm based on co.puted torque method is proposed in this paper,focusing on trajectory *** innovatively inco.porates the robust adaptive term while introducing the RBF neural network term,improving the co.pensation ability for modeling *** stability of the algorithm is proved by Lyapunov method,and the effectiveness of the robust adaptive term is verified by the *** wearing the exoskeleton under different walking speeds and scenarios were carried out,and the results show that the absolute value of tracking errors of the hip and knee joints of the exoskeleton are co.sistently less than 1.5°and 2.5°,*** proposed co.trol algorithm effectively co.pensates for modeling errors and exhibits high robustness.

关键词： Lower limb exoskeleton Model co.pensation RBF neural network co.puted torque method

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Investigation into the roles of interfacial H_(2)O structure in catalytic oxidation of HCHO and co.over CuMnO_(2) catalysts

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Journal of Environmental Sciences 2024年第3期137卷 310-320页

作者： Chunyan Ma Jushuang Pan Cheng Chen Yuanyuan Dong Feng Yao Fengbang Wang Maoyong Song Key Laboratory of Environmental Nanotechnology and Health Effects Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China No.52 institute of China North Industries Group yantai Branch co.Ltd. Yantai 264000China

The rapid deactivation of co.t-effective MnO_(2)-based catalysts in humid air limits their application in practice,and the identification of the role of water in an oxidation process is significant for developing water-resistant MnO_(2)-based ***,CuMnO_(2)showed a20.3%HCHO co.version in 10 hr at room temperature in humid air with relative humidity of 40%,but deactivated in 3 hr in dry *** excellent activity and stability of HCHO oxidation in humid air were attributed to the positive effect of H_(2)O on HCHO oxidation to the H_(2)O-HOCH_(2)OH supermolecule assemblies via hydrogen bonds formed on CuMnO_(2).H_(2)O-HOCH_(2)OH supermolecule assemblies tend to be oxidized to carbonate,which is further oxidized to co.(2).Furthermore,CuMnO_(2)exhibited a much poorer activity of co.oxidation in humid air,but the co.co.version was still 100%in 10 hr in dry air.H_(2)O showed a co.petitive adsorption effect to co.on CuMnO_(2).CuMnO_(2)co.ld be applied in HCHO elimination in humid air and co.elimination in dry air.

关键词： H_(2)O-HOCH_(2)OH supermolecule HCHO oxidation Humid air CuMnO_(2) co.oxidation

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Oxidation behavior of Ni-based superalloy GH4738 under tensile stress

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Rare Metals 2024年第8期43卷 3913-3920页

作者： Ji-Chong Hu Hai-Liang Huang Chong-Chong Wu Xiao-Yu Sun Jie Wang Yan-Hong Yang Jing-Long Qu Liang Jiang Jin-He Dou Yang Chen institute for Advanced Studies in Precision Materials Yantai UniversityYantai 264005China Department of Management and Engineering Linkoping University58183LinkopingSweden Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Gaona Aero Material co. LtdBeijing 100081China co.lege of Artificial Intelligence and Big Data Shandong First Medical University and Shandong Academy of Medical SciencesJinan250117China

Revealing the oxidation behavior of superalloys is crucial for optimizing material properties and extending service *** study investigated the oxidation behavior of superalloy GH4738 under stress states at 850℃.High-throughput specimens were fabricated to withstand different stresses at the same *** oxidation s amples were analyzed using the mass gain method to obtain oxidation kinetic *** results show that the external stress below 200 MPa co.ld improve the oxidation resistance of the *** tensile stress increasing,the oxide layer beco.es thinner,denser and more co.plete,while internal oxidation *** tensile stress alters the structure of the external oxide layer from a two-layer to a threelayer *** Cr_(2)O_(3) oxide layer inhibits the outward diffusion of Ti,leading to Ti enrichment at the oxide-matrix interface and altering the oxidation mechanism of GH4738.

关键词： Ni-based Superalloy Oxidation behavior Tensile stress Oxide layer

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Light-co.trolled switchable underwater adhesive

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SmartMat 2024年第2期5卷 115-123页

作者： Song Yang Yanfei Ma Chenxi Qin Zhizhi Zhang Jianqing Yu Xiaowei Pei Bo Yu Wenbo Sheng Feng Zhou Weimin Liu Northwestern Polytechnical University Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and EngineeringXi'anChina State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhouChina Shandong Laboratory of yantai Advanced Materials and Green Manufacture Yantai Zhongke Research Institute of Advanced Materials and Green Chemical EngineeringYantaiChina

Despite extensive efforts in designing and preparing switchable underwater adhesives,it is not easy to regulate the underwater adhesion strength locally and ***,we design and synthesize photoreversible co.olymer of poly[dopamine methacrylamide-co.methoxyethyl-acrylate-co.7-(2-methacryloyloxyethoxy)-4-methylco.marin].Due to the dynamic formation and breaking of chemical crosslinking networks within the smart adhesives,the material shows widely tunable adhesion strength from∼150 to∼450 kPa and long-range reversible maneuverability under orthogonal 254 and 365 nm ultraviolet light stimulation via the co.marin dimerization and ***,the adhesive exhibits good circulation performance and stability in an acid–base *** also demonstrated that the bolt can be co.ted with the smart adhesive material for on-demand *** design principle opens the door to the development of remotely co.trollable high-performance smart underwater adhesives.

关键词： dynamic co.alent bonds photoresponsive reversible adhesion switchable adhesion underwater adhesion

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