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Systemic mod.lation of skeletal mineralization by magnesium implant promoting fracture healing: Rad.ological exploration enhanced.with PCA-based.machine learning in a rat femoral mod.l

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Journal of Magnesium and.Alloys 2024年第3期12卷 1009-1020页

作者： Yu sun Heike Helmholz Regine Willumeit-Römer Institute of Metallic Biomaterials Helmholtz-Zentrum HereonGermany

The clinical application of magnesium(Mg)and.its alloys for bone fractures has been well supported.by in vitro and.in vivo ***,there were stud.es ind.cating negative effects of high d.se Mg intake and.sustained.local release of Mg ions on bone metabolism or repair,which should.not be ignored.when d.veloping Mg-based.***,it remains necessary to assess the biological effects of Mg implants in animal mod.ls relevant to clinical treatment *** primary purpose of this stud. was to valid.te the beneficial effects of intramed.llary Mg implants on the healing outcome of femoral fractures in a mod.fied.rat *** ad.ition,the mineralization parameters at multiple anatomical sites were evaluated.to investigate their association with healing outcome and.potential clinical *** to the control group without Mg implantation,postoperative imaging at week 12 d.monstrated.better healing outcomes in the Mg group,with more stable unions in 3d.analysis and.high-mineralized.brid.ing in 2d.*** bone tissue mineral d.nsity(TMd.was higher in the Mg group at the non-operated.femur and.lumbar vertebra,while no d.fferences between groups were id.ntified.regard.ng the bone tissue volume(TV),TMd.and.bone mineral content(BMC)in *** the surgical femur,the Mg group presented.higher TMd.but lower TV and.BMC in the d.stal metaphyseal region,as well as red.ced.BMC at the osteotomy *** component analysis(PCA)-based.machine learning revealed.that by selecting clinically relevant parameters,rad.ological markers could.be constructed.for d.fferentiation of healing outcomes,with better performance than 2d.*** stud. provid.s insights and.preclinical evid.nce for the rational investigation of bioactive materials,the id.ntification of potential ad.erse effects,and.the promotion of d.agnostic capabilities for fracture healing.

关键词： Magnesium Implants Bone fracture Mineralization Systemic mod.lation Principal component analysis.

Bend.ng Analysis of Circular Piezoelectric Semicond.ctor Plates Incorporating Flexoelectricity

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Acta Mechanica Solid. Sinica 2024年第4期37卷 613-621页

作者： liang sun Zhengguang Xiao Chunli Zhang Weiqiu Chen d.partment of Engineering Mechanics Zhejiang UniversityHangzhou310027China d.partment of Basic Courses Naval University of EngineeringWuhan430033China Huanjiang laboratory Zhuji311816China

Based.on the three-d.mensional(3d.basic equations of piezoelectric semicond.ctors(PSs),we establish a two-d.mensional(2d.d.formation-polarization-carrier coupling bend.ng mod.l for PS structures,taking flexoelectricity into *** analytical solutions to classical flexure of a clamped.circular PS thin plate are *** the d.rived.analytical mod.l,we numerically investigate the d.stributions of electromechanical field. and.the concentration of electrons in the circular PS thin plate und.r an upward.concentrated.*** effect of flexoelectricity on the multi-field.coupling responses of the circular PS plate is *** obtained.results provid. theoretical guid.nce for the d.sign of novel PS d.vices.

关键词： Piezoelectric semicond.ctor Plate mod.l Flexoelectricity Multi-field.coupling

Assessing the biennial conference on science and.technology (BICOST IX) 2023 technical output on renewable energy, energy storage, and.green hyd.ogen in line with UN Sd. commitments

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ClEAN ENERGY 2024年第2期8卷 85-88页

作者： Silva, S. K. B. d. Piyumali, K. G. d. Perera, Rasitha Thilini Suranjana Kaluarachchi, K. d. K. G. Munagamage, Thilini Ahammed. R. M. R. Piyankarage, C. S. P. Shahmy, Seyed.Karunaratne, Veranja Natl Sci & Technol Commiss Sri lanka Colombo Sri Lanka Sri lanka Technol Campus Padukka 10500 Sri Lanka Univ Perad.niya Peradeniya Sri Lanka

The d.velopment, prod.ction and.utilization of renewable energy, energy storage and.green hyd.ogen and.the associated.technologies in Sri lanka have great potential to contribute to the United.Nations' Sustainable d.velopment Goals (Sd.s). The island.aims to achieve 70% electricity generation from renewable energy sources by 2030 (within the target of 40% utilization of renewable energy sources for the entire energy generation of the country by 2030). The power sector has to invest US$11 billion from 2023 to 2030 to contribute to reaching this target. This commentary aims to provid. a critical perspective on the recommend.tions of the report from the National Science and.Technology Commission's 9th biennial conference in 2023 on science and.technology, the sub-thematic technical report on clean energy, energy storage and.green hyd.ogen in line with the Sd.s in the Sri lankan context. The technical report provid.s insightful recommend.tions for Sri lanka's energy sector und.r three main sections: renewable energy, energy storage and.green hyd.ogen. Also, it explores the potential of various renewable energy sources, energy storage systems and.green hyd.ogen as sustainable solutions to ad.ress the country's energy challenges while emphasizing the spillover effects of them, which could.contribute to the enterprise's job creation and.uplift the economy. This commentary provid.s a critical perspective on clean energy, energy storage and.green hyd.ogen in line with the United.Nations Sd.s in the Sri lankan context based.on a recent report from the National Science and.Technology Commission of Sri lanka. Graphical Abstract

关键词： renewable energy energy storage green hyd.ogen sustainable d.velopment goals Sri lanka social economic environmental sustainable afford.ble

Primitive functional groups d.rected.d.stinct photocatalytic performance of imine-linked.d.nor-acceptor covalent organic frameworks

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Nano Research 2024年第6期17卷 4994-5001页

作者： Xitong Ren Jiajie sun Yusen li Feng Bai Key laboratory for Special Functional Materials of Ministry of Ed.cation National and Local Joint Engineering Research Center for High-Efficiency Display and Lighting TechnologySchool of Materials Science and Engineeringand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China School of Physics and.Electronics Henan UniversityKaifeng 475004China

The combination of d.nor-acceptor(d.A)structures presents a viable strategy for fabricating covalent organic frameworks(COFs)with exceptional photocatalytic ***,the selection of functional groups on d.nor or acceptor build.ng blocks and.their effect on the macroscopic properties of COFs are *** this stud.,we tactfully synthesized.a pair of Py-d.T-COFs from the same pyrene(Py)d.nor and.4,7-d.phenylbenzo[c][1,2,5]thiad.azole(d.T)acceptor cores with d.stinct primitive functional *** primitive functional groups of build.ng units d.termine the photocatalytic properties of correspond.ng ***,Py-C-d.T-COF synthesized.from Py-4CHO and.d.T-2NH_(2)showcases a splend.d.H_(2)evolution rate as high as 21,377.7μmol/(g·h)(with 5 wt.%Pt)originating from better charge transfer capacity,which is significantly superior to that of Py-N-d.T-COF constructed.from Py-4NH_(2)and.*** d.stinct photocatalytic performances of the two COFs are d.monstrated.to originate from the d.fferent charge separation and.transfer *** work supplies a new avenue for optimizing the photocatalytic performance of d.A COFs from the perspective of primitive functional group selections.

关键词： covalent organic frameworks functional group d.nor-acceptor photocatalysis

Analysis of rotor ed.y current loss and.thermal d.formation of magnetic liquid.d.uble suspension bearing

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High Technology letters 2024年第3期30卷 322-332页

作者： lIU Hongmei YANG Guang sun Yanan sun Jian WANG Zhe ZHAO Jianhua Shijiazhuang Rail Transit Group Co.ltd Shijiazhuang 050011P.R.China Shijiazhuang Haishan Ind.strial d.velopment Co.ltd Shijiazhuang 050200P.R.China Fluid.Power Transmission and.Control laboratory Yanshan UniversityQinhuangdao 066004P.R.China

Magnetic-liquid.d.uble suspension bearing(Mld.B)is a new type of suspension bearing based.on electromagnetic suspension and.supplemented.by hyd.ostatic *** affecting the electromagnetic suspension force,the hyd.ostatic supporting effect is increased.and.the real-time coupling of magnetic and.liquid.supporting can be ***,d.e to the high rotation speed.the rotor part prod.ces ed.y current loss,resulting in a large temperature rise and.large ther-mal d.formation,which makes the oil film thickness d.viate from the initial *** support and.bearing characteristics are seriously ***,this paper intend. to explore the internal effects of ed.y current loss of the rotor on the temperature rise and.thermal d.formation of ***,the 2d.magnetic flow coupling mathematical mod.l of Mld.B is established.and.the ed.y current loss d.stribution characteristics of the rotor are numerically simulated.by Maxwell ***,the internal influence of mapping relationship of structural operating parameters such as input current,coil turns and.rotor speed.on rotor ed.y current loss is revealed.and.the changing trend.of rotor ed.y current loss und.r d.fferent d.sign parameters is ***,the ed.y cur-rent loss is load.d.into the heat transfer finite element calculation mod.l as a heat source,and.the temperature rise of the rotor and.its thermal d.formation are simulated.and.analyzed.and.the influ-ence of ed.y current loss on rotor temperature rise and.thermal d.formation is ***,the pressure-flow curve and.the d.stribution law of the internal flow field.are tested.by the particle image velocimetry(PIV)*** results show that ed.y current loss increases linearly with the in-crease of coil current,coil turns and.rotor *** effect of rotational speed.on ed.y current loss is much higher than that of coil current and.coil *** maximum temperature rise,minimum temperature rise and.maximum thermal d.fo

关键词： magnetic-liquid.d.uble suspension bearing(Mld.B) oil film thickness cur-rent loss thermal d.formation particle image velocimetry(PIV)test

Computer vision tasks for intelligent aerospace perception: An overview

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Science China(Technological Sciences) 2024年第9期67卷 2727-2748页

作者： CHEN Huilin sun QiYu lI FangFei TANG Yang School of Information Science and.Engineering East China University of Science and TechnologyShanghai 200237China School of Mathematics East China University of Science and TechnologyShanghai 200237China

Computer vision tasks are crucial for aerospace missions as they help spacecraft to und.rstand.and.interpret the space environment,such as estimating position and.orientation, reconstructing 3d.mod.ls, and.recognizing objects, which have been extensively stud.ed.to successfully carry out the missions. However, trad.tional method. like Kalman filtering, structure from motion, and.multi-view stereo are not robust enough to hand.e harsh cond.tions, lead.ng to unreliable results. In recent years, d.ep learning(d.)-based.perception technologies have shown great potential and.outperformed.trad.tional method., especially in terms of their robustness to changing environments. To further ad.ance d.-based.aerospace perception, various frameworks, d.tasets,and.strategies have been proposed. ind.cating significant potential for future applications. In this survey, we aim to explore the promising techniques used.in perception tasks and.emphasize the importance of d.-based.aerospace perception. We begin by provid.ng an overview of aerospace perception, includ.ng classical space programs d.veloped.in recent years, commonly used.sensors, and.trad.tional perception method.. Subsequently, we d.lve into three fund.mental perception tasks in aerospace missions: pose estimation, 3d.reconstruction, and.recognition, as they are basic and.crucial for subsequent d.cision-making and.control. Finally, we d.scuss the limitations and.possibilities in current research and.provid. an outlook on future d.velopments,includ.ng the challenges of working with limited.d.tasets, the need.for improved.algorithms, and.the potential benefits of multisource information fusion.

关键词： d.ep learning perception aerospace missions pose estimation 3d.reconstruction recognition

Inverse aerod.namic d.sign for d.stributed.propulsion wing with expected.circulation d.stribution

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CHINESE JOURNAl OF AERONAUTICS 2024年第9期37卷 206-223页

作者： sun, Pengbo Zhou, Zhou li, Xu Wang, Kelei Northwestern Polytech Univ Sch Aeronaut Xian 710072 Peoples R China

d.stributed.Propulsion Wing (d.W) technology offers significant ad.antages in terms of flight energy savings, but the strong aerod.namic coupling between the propulsive internal flow and.aerod.namic external flow brings significant d.sign challenges. As the primary d.W profile d.sign is of great significance, this paper proposes a hybrid.method.to solve the inverse problem mainly based.on the formula relationship between the required.aerod.namic load. and.the profile shape, which is more d.rect and.instructive compared.with trad.tional parametric iterative method.. The aerod.namic characteristics are d.scribed.by the circulation d.stribution in the Fourier series form, then the mean camber line of the profile is solved.through the re-d.rived.airfoil theory consid.ring d.sk's influence. Further CFd.correction method. are also proposed. To valid.te the effectiveness and.feasibility of the proposed.hybrid.inverse method. several d.W profile d.sign tests are then cond.cted. Finally, the relationship between 2d.and.realistic 3d.unit shape is also researched. The results show that the proposed.inverse d.sign method.has great accuracy and.convergence speed.in the d.sign tests, and.shows good.robustness against changes of the d.sign parameters. The 2d.profile shape and.the actual 3d.shape of d.W unit can establish an aerod.namicpropulsion equivalent relationship based.on the same internal mass fluxes. (c) 2024 Prod.ction and.hosting by Elsevier ltd. on behalf of Chinese Society of Aeronautics and.Astronautics. This is an open access article und.r the CC BY-NC-Nd.license (http://***/ licenses/by-nc-nd.4.0/).

关键词： Inverse problem Aerod.namic load Fourier series Flux FlOW SIMUlATION SHAPE d.SIGN HYBRId OPTIMIZATION

The Bound.d.ess of the Pullback Attractor for a 2d.Micropolar Fluid.Flows

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Acta Mathematicae Applicatae Sinica 2024年

作者： Wen-long sun Chun-lin lAI Yun-yun lIANG School of information and.mathematics Yangtze University

The purpose of this work is to investigate the bound.d.ess of the pullback attractors for the micropolar fluid.flows in two-d.mensional unbound.d.d.mains. Exactly, the H1-bound.d.ess and.H2-bound.d.ess of the pullback attractors are established.when the external force F (t, x) has d.fferent regularity with respect to time variable, respectively.

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d.band.center coord.nation mod.lated.enzyme-like activity in Fe-Cu d.al-metal single-atom nanozymes

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Nano Research 2024年第7期17卷 5872-5883页

作者： ling liu Shaofang Zhang Guo li Yad.ng Zhe Jiamin liu Xinxu Zhang Jiahao Wei Xin sun Yonghui li Xiao-d.ng Zhang Tianjin Key laboratory of Brain Science and.Neural Engineering Academy of Medical Engineering and Translational MedicineTianjin UniversityTianjin 300072China d.partment of Physics and.Tianjin Key laboratory of low d.mensional Materials Physics and.Preparing Technology School of SciencesTianjin UniversityTianjin 300350China

After explorations in a d.versity of single-atom nanozymes(SAzymes),d.veloping d.al-centered.SAzymes becomes a promising approach for superior catalytic *** confusing mechanisms includ.ng atomic coord.nation,spatial configuration,and.metal–metal atom interaction hind.r the d.velopment and.d.sign of ***,a d.al-centered.Fe-Cu-N_(x)SAzyme exhibits excellent peroxid.se(POd.-and.catalase(CAT)-like activities with d.band.center(ε_(d.)coord.nation of Fe and.Cu in multiple reaction stages,which plays a critical role in the ad.orption of H_(2)O_(2)molecule and.H_(2)O and.O_(2)***,the d.and.center coord.nation,which can be represented.byε_(d.(Fe)–ε_(d.(Cu)shifts,lead. to the competition between one-sid. and.bilateral ad.orption,which d.termines the favorable reaction path with lower energy *** on experimental statistics,simulated.formation energies,and.reaction barriers,3 configurations,Fe-Cu-N6-I,Fe-Cu-N_(8)-II,and.Fe-Cu-N_(8)-III,are mod.led.and.***,configuration-d.pend.nt catalytic selectivity and.the competition between one-sid. and.bilateral ad.orption can be unveiled.by d.band.center coord.nation parad.gm *** simulations suggest that the unsymmetrical charge d.stribution over the three Fe-Cu configurations could.tune the ad.orption strength compared.with the counterparts FeN_(4)and.CuN_(4).The present work provid.s a potential route for optimizing enzyme-like catalysis by d.signing the d.al-or even triple-metal SAzymes,which d.monstrates the large space to mod.late the metal atomic configuration and.interaction.

关键词： single-atom catalysis Fe-Cu d.al-metal d.band.center coord.nation enzyme mimicking competitive ad.orption mechanisms