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In-situ SEM characterization of fracture mechanism of TiB/Ti-2Al-6Sn titanium matrix composites after electroshocking treatment

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Rare Metals 2024年第6期43卷 2805-2818页

作者： Ya-Ya Wu Jian Zhou Guo-Lei Han Yan Wen Zhou Wang Li-Qiang Wang Wei-Jie Lv Le-Chun Xie Lin Hua Hubei Key Laboratory of Advanced technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components technology Wuhan 430070China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In this article,in-situ scanning electron microscope characterization of the tensile properties of TiB/Ti-2Al-6Sn titanium matrix composite(TMC)was conducted before and after electroshocking treatment(EST).After EST,the tensile strength increased by 113.2 *** effect of EST on the tensile strength and fracture behavior of TiB was investigated using in-situ characterization of the fracture morphology and crack propagation path of the matrix and *** EST,TiB fracture introduced cracks that extended into the matrix,resulting in material *** EST,the refined TiB improved the bearing capacity of the matrix,thereby improving TMC ***,after EST,the cracks were introduced into the matrix,and resulting the fracture of matrix *** an increase in the external load,cracks in the matrix were observed to propagate to TiB,and the refined TiB was fractured,detached,and pulled out,resulting in the formation of *** the propagation path of the main crack after EST showed that the deflection angle of the main crack *** micro structure of the fracture surface indicated that the fracture of the matrix was plastic,whereas that of TiB was *** EST,the size and area of the dimples increased,confirming the increase in *** results revealed that the comprehensive mechanical properties of TiB/Ti-2Al-6Sn improved after ***,EST is an efficient method for tailoring the micro structures and mechanical properties of TMCs.

关键词： TiB/Ti-2Al-6Sn In-situ microstructure characterization Tensile properties Reinforcement Electroshocking treatment(EST)

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Influence of Electroshocking Treatment on Microstructure and Mechanical Properties of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Thin-Wall Specimen Manufactured by Laser Melting Deposition

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 145-158页

作者： Yan Wen Xuan Sun Jian Zhou Bingliang Liu Haojie Guo Yuxin Li Fei Yin Liqiang Wang Lechun Xie Lin Hua Hubei Key Laboratory of Advanced technology for Automotive Components Wuhan University of TechnologyWuhan430070China Hubei Collaborative Innovation Center for Automotive Components technology Wuhan430070China Hubei Longzhong Laboratory Xiangyang441000China Shanghai Aircraft Manufacturing Co. Ltd.Commercial Aircraft Corporation of ChinaLtd.Shanghai201324China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China

In order to improve the properties of titanium alloys manufactured by laser melting deposition(LMD),the electroshocking treatment(EST)was proposed in this *** effects of EST on microstructure and mechanical properties of LMD Ti-6.5Al-3.5Mo-1.5Zr-0.3Si were *** results showed that the width of the heat affected band decreased and disappeared under the thermal and athermal effects of EST,resulting in the uniform *** the microstructure,theαlaths became coarser gradually,and the quantity ofα/βinterface was *** reduction of the quantity ofα/βinterface leads to make less resistant to dislocation,resulting in the reduction in hardness and *** discontinuous grain boundaryαphase and nucleationαcolony near grain boundary inhibited the crack propagation and improved the ***,EST can manipulate the microstructure and improve the mechanical properties of LMD titanium alloys.

关键词： Electroshocking treatment(EST) Laser melting deposition(LMD) Titanium alloy Microstructure Mechanical properties

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Enhancement and recovery of photoluminescence and stability by multifunctional etching ligands treatment for perovskite nanocrystals

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Journal of Energy Chemistry 2023年第1期76卷 495-502,I0013页

作者： Yang Zhao Haipeng Zeng Xueqing Cai Yingshan Zhou Yangming Jiang Xin Zheng Lin Li Shujing Zhang Long Luo Weixi Li Xiaoru Zhang Ranran Liu Wenxi Liang Rui Guo Xiong Li Michael Gratzel Center for Mesoscopic Solar Cells Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430073HubeiChina State Key Laboratory of Functions and applications of Medicinal plants Guizhou Medical University Guiyang 550014GuizhouChina

Perovskite nanocrystals(PNCs)have recently become promising optoelectronic materials due to their excellent photophysical ***,the highly dynamic binding state between ligands and the surface of PNCs has severely restricted their luminescent properties and *** this work,1,3-bisbenzyl-2-oxoimidazolidine-4,5-dicarboxylic acid(cycle acid,CA)is introduced as both an etchant and a ligand upon post-synthetic surface treatment of *** removing the imperfect octahedrons[Pb X_(6)]^(4-)and passivating the surface defects synergistically,this treatment improves photoluminescence quantum yields from 76%to 95%and enhances the stability of PNCs against polar solvent,moisture,heat,and ***,CA can effectively and instantly recover the luminescence emission for aged *** a result,the CA-Cs Pb Br_(3)PNCs and CA-Cs Pb IxBr_(3-x)PNCs are applied as color-converting layers on a blue LED chip for warm white light-emitting diodes(WLEDs)with a color coordinate of(0.41,0.40).Importantly,the CA-based WLED device exhibits superior stability in operational conditions.

关键词： Perovskite nanocrystals Synergistic effect Emission recovery White light emitting diodes Stability

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Smart crystalline frameworks constructed with bisquinoxaline-based component for multi-stimulus luminescent sensing materials

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Chinese Journal of Structural Chemistry 2023年第2期42卷 9-22页

作者： Peng-Da Liu Ao-Gang Liu Peng-Min Wang Yuan Chen Bao Li Key Laboratory of Material Chemistry for Energy Conversion and Storage Semiconductor Chemistry CenterSchool of Chemistry and Chemical EngineeringHubei Key Laboratory of Bioinorganic Chemistry&Materia MedicaHuazhong University of Science and TechnologyWuhanHubei 430074People's Republic of China

Crystalline materials with well-defined structures and ordered molecular arrays can provide a new research platform to fabricate new smart materials with excellent stimulus response *** them,Luminescent Metal-Organic Frameworks(LMOFs)and Hydrogen-bonding Organic Frameworks(HOFs)show great promise for fluorescence detection to different *** order to further extend the smart sensing frameworks and enhance the relevant sensing performance,the present work specifically selects 4,4',4",4(")-([6,6'-biquinoxaline]-2,2',3,3'-tetrayl)tetrabenzoic acid(H4L)consisting of the bisquinoxaline functional group as an optical response group,and HOF(HUST-25,HUST=Huazhong University of science and technology),Zn-MOF(HUST-26),and Cd-MOF(HUST-27)were successfully *** could achieve the fluorescence recognition of Fe^(3+),MnO_(4)^(-),Cr_(2)O_(7)^(2-),p-nitrotoluene(4-NP),2,4,6-trinitrotoluene(TNP)and metronidazole(MDZ).The detection range of Zn-MOF constructed using Zn ions was similar to that of HOF,but the detection sensitivity of metal cations was significantly *** Cd-MOF formed a six-fold interpenetrating structure,it was still able to retain a large pore *** dense stacking structure increases the quinoxaline density,which effectively expanded the sensitivity and detection range of fluorescence ***,Cd-MOF showed better detection for nitro explosives,antibiotics,and organic small molecules with ketone *** example,compared to the previous literatures,Cd-MOF has a larger Ksv value for the nitro-explosive nitrobenzene(NB),indicating the very high detection *** series frameworks can present excellent sensing properties mainly because the func-tional primitives can be uniformly distributed in the skeleton of the crystalline materials,forming an ordered molecular array that enables the efficient energy transfer between the external stimulus signal and the response function *** related results indic

关键词： Metal-organic framework Hydrogen bonding organic framework Luminescent sening Bisquinoxaline group Sensor

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On the Differential Uniformity and Nonlinearity of a Class of Permutation Quadrinomials Over F_(2 2 m)

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Communications in Mathematical Research 2022年第2期38卷 223-245页

作者： Mengyu Hu Nian Li Xiangyong Zeng Hubei Key Laboratory of Applied Mathematics Faculty of Mathematics and StatisticsHubei UniversityWuhanChina

Permutation polynomials with low differential uniformity and high nonlinearity are preferred in cryptographic systems. In 2018, Tu, Zeng and Helleseth constructed a new class of permutation quadrinomials over the finite field F_(2 2m) for an odd integer m. In this paper, we aim to investigate the differential uniformity and nonlinearity of this class of permutation polynomials so as to find 4-uniform permutation polynomials with high nonlinearity.

关键词： Differential uniformity finite field nonlinearity permutation polynomial

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Reclamation of CO_(2) sodium silicate used sands by steam leaching

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China Foundry 2023年第6期20卷 537-544页

作者： Ji-jun Lu Wei He Lei Yang Hua-fang Wang School of Mechanical Engineering and Automation Wuhan Textile UniversityWuhan 430200China

The bond film on the surface of the CO_(2) sodium silicate used sands is not easy to decompose,therefore,it is difficult to reclaim used sands.A new reclamation method of CO_(2) sodium silicate used sands was developed by steam leaching,which can reduce the water consumption of reclamation and improve the removal effect of sodium silicate bond ***,the leaching effect of the sodium silicate sands after 20/200/400/600/800/1,000°C heat preservation treatment was ***,the influence of the leaching time on the removal effect of the sodium silicate bond film was ***,the casting properties of the reclaimed sands after the leaching reclamation treatment were *** results show for simulated used sands after 30 min of steam leaching,the removal ratio of the alkali exceeds 84.1%,the removal ratio of silicate is 86.2%,and the removal ratio of carbonate is 93.6%.The removal rate of alkali,silicate and carbonate is relatively low in the leaching time of 30-50 *** the reclamation effect and cost,the leaching time is controlled in 30 *** consumption is only 60%of the mass of used sands for 30 min steam leaching,while it is 200%for wet *** analysis shows that most of the hazardous substances in the used sands are removed in 30 min steam leaching,and the reclaimed sands surface after steam leaching in 50 min is as smooth as new *** 30 min of steam leaching,the alkali removal effect of the factory used sands can reach 81.5%,the water consumption by the steam leaching reclamation is 58%of the mass of the used sand,which is similar to the result of simulated used *** performance of reclaimed sands obtained after 30 min steam leaching is better than that of new sands when the amount of sodium silicate added is 6%of the mass of the reclaimed sands and the CO_(2) blowing time is 15 s:the 24 h ultimate compressive strength of reclaimed sands is 5.6 MPa(equated with new sands),and the collapsibi

关键词： sodium silicate sands steam leaching simulated temperature reclamation

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Taxonomy of Epimedium(Berberidaceae)with special reference to Chinese species

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Chinese Herbal Medicines 2022年第1期14卷 20-35页

作者： Yanjun Zhang Jianqiang Li Ying Wang Qiong Liang Key Laboratory of plant Germplasm Enhancement and Specialty Agriculture Wuhan Botanical GardenChinese Academy of SciencesWuhan 430074China Provincial Key Laboratory of Digital Botanical Garden and Public science South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China

Epimedii Herba is a commonly used traditional Chinese herbal *** Epimedium species are included in Chinese Pharmacopoeia and most species of Epimedium are used as Epimedii Herba in practical ***,as the largest herbaceous genus of the Berberidaceae,Epimedium has many taxonomic controversies which hinder the effective use of Epimedii *** paper reviewed the taxonomic research related to Epimedium,including taxonomic history,taxonomic values of morphological characters,species and distribution,infra-genera taxonomic system and the taxonomic research of Chinese *** instance,we recognized Epimedium wushanense and clarified that the species,as described in Flora Reipublicae Popularis Sinicae and Flora of China,actually includes four Epimedium species similar in leaflet *** general,it was recognized here that Epimedium comprises 62 species,of which 52 species are distributed in *** Chinese Epimedium species with the most taxonomic problems,the taxonomic research on the taxa was reviewed and the newest species key was proposed along with proposals for those taxonomic problems needing further *** review is of great implication for the identification,exploration and utilization of Epimedii Herba.

关键词： Chinese taxon Epimedium L. Taxonomy Review

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GIL:a tightly coupled GNSS PPP/INS/LiDAR method for precise vehicle navigation

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Satellite Navigation 2021年第1期2卷 368-384页

作者： Xingxing Li Huidan Wang Shengyu Li Shaoquan Feng Xuanbin Wang Jianchi Liao School of Geodesy and Geomatics Wuhan University129 Luoyu RoadWuhan 430079China

Accurate positioning and navigation play a vital role in vehicle-related applications,such as autonomous driving and precision *** the rapid development of Global Navigation Satellite Systems(GNSS),Precise Point Positioning(PPP)technique,as a global positioning solution,has been widely applied due to its convenient ***,the performance of PPP is severely affected by signal interference,especially in GNSS-challenged *** Navigation System(INS)aided GNSS can significantly improve the continuity and accuracy of navigation in harsh environments,but suffers from degradation during GNSS ***(Laser Imaging,Detection,and Ranging)-Inertial Odometry(LIO),which has performed well in local navigation,can restrain the divergence of Inertial Measurement Units(IMU).However,in long-range navigation,error accumulation is inevitable if no external aids are *** improve vehicle navigation performance,we proposed a tightly coupled GNSS PPP/INS/LiDAR(GIL)integration method,which tightly integrates the raw measurements from multi-GNSS PPP,Micro-Electro-Mechanical System(MEMS)-IMU,and LiDAR to achieve high-accuracy and reliable navigation in urban *** experiments were conducted to evaluate this *** results indicate that in comparison with the multi-GNSS PPP/INS tightly coupled solution the positioning Root-Mean-Square Errors(RMSEs)of the proposed GIL method have the improvements of 63.0%,51.3%,and 62.2%in east,north,and vertical components,*** GIL method can achieve decimeter-level positioning accuracy in GNSS partly-blocked environment(i.e.,the environment with GNSS signals partly-blocked)and meter-level positioning accuracy in GNSS difficult environment(i.e.,the environment with GNSS hardly used).Besides,the accuracy of velocity and attitude estimation can also be enhanced with the GIL method.

关键词： Multi-GNSS PPP MEMS-IMU LiDAR Tightly coupled method GNSS-challenged environment Vehicle navigation

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A Small-Scale Medication of Leflunomide as a Treatment of COVID-19 in an Open-Label Blank-Controlled Clinical Trial

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Virologica Sinica 2020年第6期35卷 725-733页

作者： Ke Hu Mengmei Wang Yang Zhao Yunting Zhang Tao Wang Zhishui Zheng Xiaochen Li Shaolin Zeng Dong Zhao Honglin Li Ke Xu Ke Lan Department of Respiratory and Critical Care Medicine Renmin Hospital of Wuhan UniversityWuhan 430060China Shanghai Key Laboratory of New Drug Design State Key Laboratory of Bioreactor EngineeringSchool of PharmacyEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Virology College of Life SciencesWuhan UniversityWuhan 430072China frontier science Center for Immunology and Metabolism Wuhan UniversityWuhan 430072China

We recently reported that inhibitors against human dihydroorotate dehydrogenase(DHODH)have broad-spectrum antiviral activities including their inhibitory efficacies on SARS-CoV-2 replication in infected ***,there are limited data from clinical studies to prove the application of DHODH inhibitors in Coronavirus disease 2019(COVID-19)*** the present study,we evaluated Leflunomide,an approved DHODH inhibitor widely used as a modest immune regulator to treat autoimmune diseases,in treating COVID-19 disease with a small-scale of *** of 10 laboratory-confirmed COVID-19 patients of moderate type with obvious opacity in the lung were *** of the patients were treated with Leflunomide,and another five were treated as blank controls without a *** the patients accepted standard supportive treatment for *** patients given Leflunomide had a shorter viral shedding time(median of5 days)than the controls(median of 11 days,P=0.046).The patients given Leflunomide also showed a significant reduction in C-reactive protein levels,indicating that immunopathological inflammation was well *** obvious adverse effects were observed in Leflunomide-treated patients,and they all discharged from the hospital faster than *** preliminary study on a small-scale compassionate use of Leflunomide provides clues for further understanding of Leflunomide as a potential antiviral drug against COVID-19.

关键词： DHODH inhibitors Leflunomide Coronavirus disease 2019(COVID-19) Viral shedding time Inflammation

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Semi-tightly coupled integration of multi-GNSS PPP and S-VINS for precise positioning in GNSS-challenged environments

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Satellite Navigation 2021年第1期2卷 1-14页

作者： Xingxing Li Xuanbin Wang Jianchi Liao Xin Li Shengyu Li Hongbo Lyu School of Geodesy and Geomatics Wuhan University129 Luoyu RoadWuhan 430079China

Because of its high-precision,low-cost and easy-operation,Precise Point Positioning(PPP)becomes a potential and attractive positioning technique that can be applied to self-driving cars and ***,the reliability and availability of PPP will be significantly degraded in the extremely difficult conditions where Global Navigation Satellite System(GNSS)signals are blocked *** Navigation System(INS)has been integrated with GNSS to ameliorate such situations in the last ***,the Visual-Inertial Navigation Systems(VINS)with favorable complementary characteristics is demonstrated to realize a more stable and accurate local position estimation than the ***,the system still must rely on the global positions to eliminate the accumulated *** this contribution,we present a semi-tight coupling framework of multi-GNSS PPP and Stereo VINS(S-VINS),which achieves the bidirectional location transfer and sharing in two separate navigation *** our approach,the local positions,produced by S-VINS are integrated with multi-GNSS PPP through a graph-optimization based ***,the accurate forecast positions with S-VINS are fed back to assist PPP in GNSS-challenged *** statistical analysis of a GNSS outage simulation test shows that the S-VINS mode can effectively suppress the degradation of positioning accuracy compared with the INS-only *** also carried out a vehicle-borne experiment collecting multi-sensor data in a GNSS-challenged *** the complex driving environment,the PPP positioning capability is significantly improved with the aiding of *** 3D positioning accuracy is improved by 49.0%for Global Positioning System(GPS),40.3%for GPS+GLOANSS(Global Navigation Satellite System),45.6%for GPS+BDS(BeiDou navigation satellite System),and 51.2%for GPS+GLONASS+*** this basis,the solution with the semi-tight coupling scheme of multi-GNSS PPP/S-VINS achieves the improvements of 41

关键词： Multi-GNSS PPP Visual-inertial odometry Multi-sensor fusion GNSS-challenged environment Autonomous driving

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