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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 102-118页

作者： Yu-Hang Chu Liang-Yu Chen Bo-Yuan qin Wenbin Gao Fanmin Shang Hong-Yu Yang Lina Zhang Peng qin lai-Chang Zhang School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212100China Foshan(Southern China)Institute for New Materials Foshan528200China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchun130025China Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

In actual physiological environments,bacteria can activate the immune system and release lactic ***,the detailed contribution of lactic acid to the passivation behavior of titanium(Ti)alloys is still *** current work investigated the in vitro passivation behavior of Ti-6Al-4V(TC4)alloys fabricated by laser powder bed fusion in Hank's solution with and without adding lactic *** methods,inductively coupled plasma atomic emission spectrometer,and X-ray photoelectron spectroscopy were jointly *** lactic acid decreases the corrosion resistance of samples by degrading the formed passive *** film formed in the(lactic acid)-containing solution exhibits a higher level of oxygen vacancies and a lower thickness,attributed to the suppressed formation of Ti^(4+)transformed from Ti^(3+)and Ti^(2+).Moreover,the presence of lactic acid would increase the open circuit potential,relieve the ions release,and hinder the deposition of calcium phosphates within 24 h immersion.

关键词： Titanium alloy Corrosion behavior Passive film Lactic acid Laser powder bed fusion

Soluble Polyimide-reinforced TGDDM and DGEBA Epoxy Composites

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Chinese Journal of Polymer Science 2020年第8期38卷 867-876,I0007页

作者： Qi Chen shun Wang Feng qin Kuan Liu Qian Liu qing Zhao Xing-Yi Wang Yan-Hong Hu Research Institute of Industrial Catalysis School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Key Laboratory for Specially Functional Polymers and Related Technology of Ministry of Education School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

Polyimide(PI)synthesized from aromatic diamine and dianhydrides via two-step poly-condensation method was highly soluble in TGDDM(MY-720)and DGEBA(E-51)at desirable ***-PI(M-PI)and DGEBA-PI(E-PI)composites within 0.5%-3%PI loading could be prepared without organic *** the cryogenically fractured surfaces of M-PI and E-PI composites,no obvious heterogeneous phase was observed by *** mechanical properties were promoted significantly by PI,especially for impact *** 2%PI-2W into MY-720 and E-51 composites,the impact strength increased to 21 and 51 kJ/m2,the tensile strength increased by 62%and 19%,and the flexural strength by 18%and 13%,respectively,with slight increases in tensile *** results were related to the promotion in plasticity of composites and changes in fragile→ductile fracture ***,Tg and thermal stability of M-PI and E-PI were increased effectively.

关键词： Polyimide TGDDM and DGEBA epoxy resin Impact strength Toughness

Electronic structure evolution accompanying heavy fermion formation in CeCu2Si2

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Science China(Physics,Mechanics & Astronomy) 2020年第8期63卷 123-131页

作者： XueBing Luo Yun Zhang QiuYun Chen qin Liu LiZhu Luo ShiYong Tan XieGang Zhu XinChun lai Science and Technology on Surface Physics and Chemistry Laboratory Mianyang 621908China

The cooper pairs in the heavy-fermion superconductor CeCu2Si2 are formed of heavy ***,the heavy fermions are fundamental to the emergence of unconventional superconductivity and associated non-Fermi-liquid behavior in the normal *** interplay between localization and itinerancy manifested on the electronic structure is key for understanding the heavyfermion ***,via the first-principle density functional theory(DFT)combined with single-site dynamical mean-field theory(DMFT),we investigate the temperature(T)evolution of the electronic structure of CeCu2Si2 in the normal state,focusing on the role of the 4f states in the low energy *** characteristic temperature scales of this evolution,which accompanied the heavy-fermion formation,are *** coherence onset temperature is around 130K,whereas the heavy-fermion band formation temperature is between 40 and 80K;both characteristic temperature scales are higher than the transport coherence ***,the heavy-fermion formation is confirmed by calculating its effective mass variation with the *** on the calculated T-dependent evolution of the 4 f orbital occupancy and electronic structure,an explanation on the behavior of the temperature evolution of the correlation strength of CeCu2Si2 is *** results offer a comprehensive microscopic picture of the heavy-fermion formation in CeCu2Si2,which is essential for further understanding the emergent superconducting pairing mechanism.

关键词： CeCu2Si2 heavy-fermion formation temperature electronic structure DFT+DMFT

Automated classification of dual channel dental imaging of auto-fluorescence and white lightby convolutional neural networks

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Journal of Innovative Optical Health Sciences 2020年第4期3卷 20-27页

作者： Cheng Wang Haotian qin Guangyun lai Gang Zheng Huazhong Xiang Jun Wang Dawei Zhang Institute of Biomedical Optics and Optometry Key Laboratory of Medical Optical Technology and Instrument Ministry of Education University of Shanghai for Science and Technology Shanghai 200093 P.R.China Shanghai Engineering Research Center of Interventional Medical Device University of Shanghai for Science and Technology Shanghai 200093 P.R.China Department of Pediatric Dentistry Ninth People's Hospital Shanghai Jiao Tong University School of Medicine Shanghai 200011 P.R.China Shanghai Key Laboratory of Stomatology&Shanghai Research Institute of Stomatology National Clinical Research Center of Stomatology Shanghai 200011 P.R.China Engineering Research Center of Optical Instrument and System Ministry of Education Shanghai Key Laboratory Modern Optical System of Shanghai University of Shanghai for Science and Technology Shanghai 200093P.R.China Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai 200093P.R.China

Prevention is the most effective way to reduce dental *** order to provide a simple way to achieve oral healthcare direction in daily life,dual Channel,portable dental Imaging system that combine white light with autofluorescence techniques was established,and then,a group of volunteers were recruited,7200 tooth pictures of different dental caries stage and dental plaque were taken and *** this work,a customized Convolutional Neural Networks(CNNs)have been designed to classify dental image with early stage caries and dental *** percentage(n=6000)of the pictures taken were used to supervised training of the CNNs based on the experienced dentists'advice and the rest 20%(n=1200)were used to a test dataset to test the trained *** accuracy,sensitivity and specificity were calculated to evaluate perfor-mance of the *** accuracy for the early stage caries and dental plaque were 95.3%and 95.9%,*** results shown that the designed image system combined the cus-tomized CNNs that could automatically and efficiently find early caries and dental plaque on occlusal,lingual and buccal ***,this will provide a novel approach to dental caries prevention for everyone in daily life.

关键词： Biomedical imaging caries tooth healthcare auto-flourescence automatic classifi-cation deep-learning

Electromagnetic scattering and imaging simulation of extremely large-scale sea-ship scene based on GPU parallel technology

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Journal of Electronic Science and Technology 2024年第2期22卷 16-23页

作者： Cheng-Wei Zhang Zhi-qin Zhao Wei Yang Li-lai Zhou Hai-Yu Zhu Southwest China Institute of Electronic Technology Chengdu610036China School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu611731China Tencent Company Shenzhen518054China

Aiming to solve the bottleneck problem of electromagnetic scattering simulation in the scenes of extremely large-scale seas and ships,a high-frequency method by using graphics processing unit(GPU)parallel acceleration technique is *** the implementation of different electromagnetic methods of physical optics(PO),shooting and bouncing ray(SBR),and physical theory of diffraction(PTD),a parallel computing scheme based on the CPU-GPU parallel computing scheme is realized to balance computing ***,a multi-GPU framework is further proposed to solve the computational difficulty caused by the massive number of ray tubes in the ray tracing *** using the established simulation platform,signals of ships at different seas are simulated and their images are achieved as *** is shown that the higher sea states degrade the averaged peak signal-to-noise ratio(PSNR)of radar image.

关键词： Multi graphics processing unit Radar imaging Sea-ship Shooting and bouncing rays

Highly efficient enantioselective synthesis of bispiro[benzofuran-oxindole/benzofuran-chromanone]s through organocatalytic inter-/intramolecular Michael cycloaddition

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Chinese Chemical Letters 2020年第2期31卷 381-385页

作者： Min Zhang Jun-Xin Wang shun-qin Chang Xiong-Li Liu Xiong Zuo Ying Zhou Guizhou Engineering Center for Innovative Traditional Chinese Medicine and Ethnic Medicine Guizhou UniversityGuiyang 550025China College of Pharmaceutical Sciences Guizhou University of Traditional Chinese MedicineGuiyang 550025China

A quinine-derived thiourea-catalyzed inter-/intramolecular Michael cycloaddition of chromoneoxindole/benzofuranone synthons with 3-substituted methylenebenzofuranones has been established,which constructed enantiomerically pure bispiro[benzofuran-oxindole/benzofuran-chromanone]s bearing five consecutive stereocenters including two spiro quaternary carton centers in good yields(up to 93%) with high diastereoselectivities(up to>20:1 dr) and good enantioselectivities(up to>99% ee).Moreover,this is the first example of bifunctional chromone-benzofuranone synthon directed organocatalytic tandem reaction,and also the first example of the bispiro[benzofuran-oxindole] and bispirobenzofuranone,potentially useful in medicinal chemistry.

关键词： Chromone-oxindole synthon Chromone-benzofuranone synthon Inter-/intramolecular Michael cycloaddition Bispiro[benzofuran-oxindole-chromanone] Bispirobenzofuranone

Constructing the latest Neoproterozoic to Early Paleozoic multiple crust-mantle interactions in western Bainaimiao arc terrane,southeastern Central Asian Orogenic Belt

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Geoscience Frontiers 2020年第5期11卷 1727-1742页

作者： Min Liu Shaocong lai Da Zhang Renzhi Zhu Jiangfeng qin Guangqiang Xiong Haoran Wang State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 710069China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Geophysical and Geochemical Exploration Party Jiangxi Bureau of Geology and Mineral ResourcesNanchang 330201China

Identifying the crust-mantle interactions in association with the evolution of the Precambrian microcontinents provides critical constraints on the accretionary evolution in the Central Asian Orogenic Belt(CAOB).The Bainaimiao arc terrane(BAT)is one of the most important Precambrian microcontinents in southeastern CAOB,however,few studies have paid attention to the types and the evolving processes of the crust-mantle interactions that occurred before its final accretion onto the northern North China *** study presents an integrated study of geochronology,zircon Hf isotope and whole-rock geochemistry on the latest Neoproterozoic diabases and the Early Paleozoic arc intrusions in the western *** latest Neoproterozoic(ca.546 Ma)diabases display low SiO2(46.52-49.24 wt.%)with high MgO(8.23-14.41 wt.%),Cr(66-542 ppm)and Ni(50-129 ppm),consisting with mantle *** highly negative zirconεHf(t)(-12.0 to-24.7)and high Fe/Mn ratios(62.1-81.7)further indicate a significantly enriched mantle *** that the BAT maybe initially separated from the Tarim Craton with a thickened crustal root,we propose that these diabases were generated through partial melting of an enriched lithospheric mantle source that had been hybridized by lower-crustal eclogites during foundering of the BAT lower *** Early Paleozoic(ca.475-417 Ma)arc intrusions in western BAT can be divided into PeriodsⅠandⅡat approximately 450 *** PeriodⅠ(>450 Ma)intrusions contain abundant mafic minerals like hornblende and pyroxene,and show positive zirconεHf(t)(+1.5 to+10.9).They are predominantly medium-K calc-alkaline with broad correlations of SiO2 versus various major and trace elements,which correlate well with the experimental melts produced by the fractional crystallization of primitive hydrous arc magmas at 7 *** assume they were formed through mid-crustal differentiation of the mantle wedge-derived hydrous basaltic *** contrast,the PeriodⅡ(≤450 Ma)intrusions are c

关键词： Zircon Hf isotope Microcontinent Crust-mantle interaction Arc intrusions Central asian orogenic belt

Numerical studies of the hydrodynamic damping of a vibrating hydrofoil in torsional mode

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Journal of Hydrodynamics 2021年第2期33卷 347-360页

作者： Yong-shun Zeng Zhi-feng Yao Biao Huang Fu-jun Wang qin Wu Ruo-fu Xiao Guo-yu Wang College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083China Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System Beijing 100083China School of Mechanical and Vehicular Engineering Beijing Institute of TechnologyBeijing 100081China

The vortex-induced vibration may lead to a premature failure of hydraulic mechanical systems,especially under the resonance condition in the torsional *** predict the structural fatigue life,a careful consideration of the dynamic response to the hydraulic excitations is essential in the design *** study focuses on the numerical investigation of the relationship between the flow velocity,the added mass and the hydrodynamic damping,particularly,with respect to a Donaldson-type hydrofoil,vibrating in the first torsional mode.A two-way fluid-structure interaction(FSI)method is used to predict above two *** flow velocity is in the range of 0 m/s-20m/*** evaluate the hydrodynamic damping ratio,an identification method is proposed,based on a modified version of the logarithmic decay *** relative deviations of the simulated natural frequencies and hydrodynamic damping ratios as compared with the experimental data for the first torsional modes,are within 8.1%and 16.6%,*** analysis results show that the added mass coefficient for the first torsional mode is in the range of 1.59-1.86,and is around 44%of that for the first bending *** trends of the boundary layer thickness and the wake width against the reduced velocity are found to be opposite to that of the hydrodynamic damping *** theoretical equation for predicting the hydrodynamic damping ratio is modified,which is shown to be more reliable due to its consideration of the velocity independent hydrodynamic damping phase.

关键词： Torsional mode hydrodynamic damping added mass hydrofoil Donaldson trailing edge

A robust online path planning approach in cluttered environments for micro rotorcraft drones

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Control Theory and Technology 2016年第1期14卷 83-96页

作者： Shupeng lai Kangli WANG Hailong qin Jin Q. CUI Ben M. CHEN NUS Graduate School for Integrative Sciences & Engineering National University of Singapore Singapore 117456 Department of Electrical & Computer Engineering National University of Singapore Singapore 117583 Temasek Laboratories National University of Singapore Singapore 117411

We present in this paper a robust online path planning method, which allows a micro rotorcraff drone to fly safely in GPS-denied and obstacle-strewn environments with limited onboard computational power. The approach is based on an effi- ciently managed grid map and a closed-form solution to the two point boundary value problem （TPBVP）. The grid map assists trajectory evaluation whereas the solution to the TPBVP generates smooth trajectories. Finally, a top-level trajectory switching algorithm is utilized to minimize the computational cost. Advantages of the proposed approach include its conservation of com- putational resource, robustness of trajectory generation and agility of reaction to unknown environment. The result has been realized on actual drones platforms and successfully demonstrated in real flight tests. The video of flight tests can be found at： http：//***/***.

关键词： Unmanned aerial vehicles mapping path planning trajectory generation

Characteristics of Sb6Te4/VO2 Multilayer Thin Films for Good Stability and Ultrafast Speed Applied in Phase Change Memory

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Chinese Physics Letters 2018年第9期35卷 53-56页

作者： Yi-Feng Hu Xuan Guo qing-Qian qin Tian-Shu lai School of Mathematics and Physics Jiangsu University of TechnologyChangzhou 213000 State Key Laboratory of Optoelectronic Materials and Technology School of PhysicsSun Yat-Sen UniversityGuangzhou 510275 State Key Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310027 Key Laboratory of Microelectronic Devices ＆ Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029

The Sb6 Te4/VO2 multilayer thin films are prepared by magnetron sputtering and the potential application in phase change memory is investigated in detail. Compared with Sb6 Te4, Sb6 Te4/VO2 multilayer composite thin films have higher phase change temperature and crystallization resistance, indicating better thermal stability and less power consumption. Also, Sb6 Te4/VO2 has a broader energy band of 1.58 eV and better data retention （125℃ for 103/）. The crystallization is suppressed by the multilayer interfaces in Sbf Te4/VO2 thin film with a smaller rms surface roughness for Sbf Te4/VO2 than monolayer Sb4Te6. The picosecond laser technology is applied to study the phase change speed. A short crystallization time of 5.21 ns is realized for the Sb6Te4 （2nm）/VO2 （8nm） thin film. The Sb6 Te4/VO2 multilayer thin film is a potential and competitive phase change material for its good thermal stability and fast phase change speed.

关键词： VO Te Characteristics of Sb6Te4/VO2 Multilayer Thin Films for Good Stability and Ultrafast Speed Applied in Phase Change Memory Sb