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| 1 | Role of primary Zr-rich particles on microstructure and magnetic properties of 2:17-type Sm-Co-Fe-Cu-Zr permanent magnets显示文摘Trace Zr addition is essential for achieving desired cellular nanostructure and large coercivity in the pinning-controlled 2:17-type Sm-Co-Fe-Cu-Zr magnets that have served as the strongest high temperature permanent magnets for over 40 years.However,accompanying this is the formation of Zr-rich particles that may deteriorate the hard magnetic properties.Besides the formerly-reported 1:3R Zr-rich platelets,in this work,1–2μm sized Zr6(Co,Fe)23(6:23)particles(Fm 3 m)and 100–200 nm sized 1:3R Zr-rich particles were also found based on combined structural identifications and element mapping analysis.Around such particles,the desired 1:5H cell wall precipitates that provide the strongest pinning force of magnetic domain wall motions are rare,forming the precipitate-free-zones(PFZs).The 1:5H-PFZs and the soft magnetism of both 6:23 and 1:3R Zr-rich particles act as local weak pinning points,which are unfavorable to retain the large magnetization in strong opposite fields and lead to poor squareness.As observed in a Sm25Co45.9Fe19.5Cu5.6Zr4.0(wt.%)magnet,the co-existence of such Zr-rich particles and the associated 1:5H-PFZs leads to a pretty low squareness factor of only 52.89%given the large coercivity of 29.04 kOe.Our findings suggest that careful controlling the Zr content and avoiding its aggregation to form harmful 6:23 and 1:3R Zr-rich particles are essential for achieving high squareness as well as large energy product in the Sm-Co-Fe-Cu-Zr permanent magnets. | Tao Yuan Xin Song Xianglong Zhou Wentao Jia Munzali Musa Jingdong Wang Tianyu Ma | 2020 | Journal of Materials Science & Technology2020，52，18： | 6 |
| 2 | Active structural acoustic control of an elastic cylindrical shell coupled to a two-stage vibration isolation system显示文摘 | Ma Xianglong Jin Guoyong Liu Zhigang | 2014 | International Journal of Mechanical Sciences2014，79，： | 1 |
| 3 | Stable sodium anodes for sodium metal batteries(SMBs) enabled by in-situ formed quasi solid-state polymer electrolyte显示文摘A high-performance quasi-solid polymer electrolyte for sodium metal batteries(SMBs)based on in-situ polymerized poly(1,3-dioxolane)(DOL)with 20%volume ratio of fluoroethylene carbonate(FEC),termed'PDFE-20',is proposed in this work.It is demonstrated PDFE-20 possesses a room-temperature ionic conductivity of 3.31×10^(-3) S cm^(-1),an ionic diffusion activation energy of 0.10 eV,and an oxidation potential of 4.4 V.SMBs based on PDFE-20 and Na_(3)V_(2)(PO_(4))_(3)(NVP)cathodes were evaluated with an active material mass loading of 6.8 mg cm^(-2).The cell displayed an initial discharge specific capacity of 104 mA h g^(-1),and97.1%capacity retention after 100 cycles at 0.5 C.In-situ polymerization conformally coats the anode/-cathode interfaces,avoiding geometrical gaps and high charge transfer resistance with ex-situ polymerization of the same chemistry.FEC acts as a plasticizer during polymerization to suppress crystallization and significantly improves ionic transport.During battery cycling FEC promotes mechanical congruence of electrolyte-electrode interfaces while forming a stable NaF-rich solid electrolyte interphase(SEI)at the anode.Density functional theory(DFT)calculations were also performed to further understand the role FEC in the poly(DOL)-FEC electrolytes.This work broadens the application of in-situ prepared poly(DOL)electrolytes to sodium storage and demonstrates the crucial role of FEC in improving the electrochemical performance. | Jian Ma Xuyong Feng Yueyue Wu Yueda Wang Pengcheng Liu Ke Shang Hao Jiang Xianglong Hou David Mitlin Hongfa Xiang | 2023 | Journal of Energy Chemistry2023，，2： | 0 |
| 4 | Revisiting the pinning sites in 2:17-type Sm-Co-Fe-Cu-Zr permanent magnets显示文摘It is still an open debate whether the 1:5 H cell boundaries(CBs)or the intersections of 1:3 R platelets and1:5 H CBs are the strong pining sites for the cellular nanostructured 2:17-type Sm-Co-Fe-Cu-Zr high temperature permanent magnets despite that they have been widely applied in advanced industries since 1970 s.Herein,through tuning the volume fraction of Zr-enriched 1:3 R platelets by varying the second-step aging time,the pinning behavior in a model magnet Sm_(2.5)Co_(44.9)Fe_(21.5)Cu_(5.6)Zr_(3.0)(wt%)was investigated.The results show that the volume fraction of 1:3 R platelets can be effectively enlarged without changing the cell size(i.e.the volume fraction of CBs)by extending the aging time at 400℃.Micro scopic TEM characterizations co mbined with macro scopic magnetic measurements reveals that the locally thickened 1:3 R platelets after long-term second-step aging reduce the effective pinning area by interrupting the magnetic domain walls at CBs,weakening the average pinning strength and the coercivity of the magnet.Consequently,our work supports that the 1:5 H CBs act as the dominating pinning sites instead of the intersections of 1:3 R platelets and 1:5 H CBs,which may provide an important insight towards understanding the hard magnetism of pinning-controlled permanent magnets. | Xianglong Zhou Yao Liu Wentao Jia Xin Song Andong Xiao Tao Yuan Fang Wang Jiuping Fan Tianyu Ma | 2021 | Journal of Rare Earths2021，39，12： | 0 |
| 5 | ARCosmetics:a real-time augmented reality cosmetics try-on system显示文摘A virtual cosmetics try-on system provides a realistic try-on experience for consumers and helps them efficiently choose suitable cosmetics.In this article,we propose a real-time augmented reality virtual cosmetics try-on system for smartphones(ARCosmetics),taking speed,accuracy,and stability into consideration at each step to ensure a better user experience.A novel and very fast face tracking method utilizes the face detection box and the average position of facial landmarks to estimate the faces in continuous frames.A dynamic weight Wing loss is introduced to assign a dynamic weight to every landmark by the estimated error during training.It balances the attention between small,medium,and large range error and thus increases the accuracy and robustness.We also designed a weighted average method to utilize the information of the adjacent frame for landmark refinement,guaranteeing the stability of the generated landmarks.Extensive experiments conducted on a large 106-point facial landmark dataset and the 300-VW dataset demonstrate the superior performance of the proposed method compared to other state-of-the-art methods.We also conducted user satisfaction studies further to verify the efficiency and effectiveness of our ARCosmetics system. | Shan AN Jianye CHEN Zhaoqi ZHU Fangru ZHOU Yuxing YANG Yuqing MA Xianglong LIU Haogang ZHU | 2023 | Frontiers of Computer Science2023，17，4： | 0 |
| 6 | Perspective on low-temperature electrolytes for LiFePO 4-based lithium-ion batteries显示文摘The olivine-type lithium iron phosphate(LiFePO_(4))cathode material is promising and widely used as a high-performance lithium-ion battery cathode material in commercial batteries due to its low cost,environmental friendliness,and high safety.At present,LiFePO_(4)/C sec-ondary batteries are widely used for electronic products,automotive power batteries,and other occasion-related applications with good thermal stability,stable cycle performance,and low room-temperature self-discharge rate.However,LiFePO_(4)-based battery applications are seriously limited when they are operated in a cold climate.This outcome is due to a considerable decrease in Li+transport capabilities within the elec-trode,particularly leading to a dramatic decrease in the electrochemical capacity and power performance of the electrolyte.Therefore,the design of low-temperature electrolytes is important for the further commercial application of LiFePO_(4) batteries.This paper reviews the key factors for the poor low-temperature performance of LiFePO_(4)-based batteries and the research progress of low-temperature electrolytes.Spe-cial attention is paid to electrolyte components,including lithium salts,cosolvents,additives,and the development of new electrolytes.The factors affecting the anode are also analyzed.Finally,according to the current research progress,some viewpoints are summarized to provide suitable modification methods and research suggestions for improving the practicability of LiFePO_(4)/C commercial batteries at low temperat-ures in the future. | Xianglong Chen Yudong Gong Xiu Li Feng Zhan Xinhua Liu Jianmin Ma | 2023 | International Journal of Minerals,Metallurgy and Materials2023，30，1： | 0 |
| 7 | In Situ Directional Polymerization of Poly(1,3-dioxolane)Solid Electrolyte Induced by Cellulose Paper-Based Composite Separator for Lithium Metal Batteries显示文摘In traditional in situ polymerization preparation for solid-state electrolytes,initiators are directly added to the liquid precursor.In this article,a novel cellulose paper-based composite separator is fabricated,which employs alumina as the inorganic reinforcing material and is loaded with polymerization initiator aluminum trifluoromethanesulfonate.Based upon this,a separator-induced in situ directional polymerization technique is demonstrated,and the extra addition of initiators into liquid precursors is no longer required.The polymerization starts from the surface and interior of the separator and extends outward with the gradually dissolving of initiators into the precursor.Compared with its traditional counterpart,the separator-induced poly(1,3-dioxolane)electrolyte shows improved interfacial contact as well as appropriately mitigated polymerization rate,which are conducive to practical applications.Electrochemical measurement results show that the prepared poly(1,3-dioxolane)solid electrolyte possesses an oxidation potential up to 4.4 V and a high Li+transference number of 0.72.After 1000 cycles at 2 C rate(340 mA g^(−1)),the assembled Li||LiFePO_(4)solid battery possesses a 106.8 mAh g^(−1)discharge capacity retention and 83.5%capacity retention ratio,with high average Coulombic efficiency of 99.5%achieved.Our work may provide new ideas for the design and application of in situ polymerization technique for solid electrolytes and solid batteries. | Jian Ma Yueyue Wu Hao Jiang Xin Yao Fan Zhang Xianglong Hou Xuyong Feng Hongfa Xiang | 2023 | Energy & Environmental Materials2023，6，3： | 0 |
| 8 | A meaningful learning method for zero-shot semantic segmentation显示文摘Zero-shot semantic segmentation,which is developed to segment unseen categories,has attracted increasing attention due to its strong practicability.Previous approaches usually applied semantic-visual mapping based on seen categories to unseen categories,and thus failed to generate meaningful unseen visual representations and struggled to balance the seen and unseen concepts in the classifier.To overcome the above limitations,we propose a novel meaningful learning method that could be embedded into any generationbased zero-shot semantic segmentation model,borrowing the idea from the educational psychology field.The proposed meaningful learning method refers to the process that the new concepts could be learned by relating to existing comprehensible concepts and harmoniously incorporated into the concept schema.Specifically,we introduce a generator with conjugate conceptual correlation(G3C)which generates meaningful unseen visual information through anchoring into existing concepts.Moreover,simulating the rational thinking mechanism,we introduce a fast-slow concept modulator to alleviate the noisy over-correlation problem introduced by G3C and further construct a comprehensive concept schema.Extensive experiments conducted on three benchmarks demonstrate the superior performance of our method,especially according to the commonlyacknowledged h-m Io U(e.g.,4% improvement on the Pascal-VOC dataset). | Xianglong LIU Shihao BAI Shan AN Shuo WANG Wei LIU Xiaowei ZHAO Yuqing MA | 2023 | Science China(Information Sciences)2023，66，11： | 0 |
| 9 | Outdoor Domestication Cultivation and Survival Mechanism for Tissue Culture Seedlings of Paeonia suffruticosa显示文摘In order to reveal the differences between different peony varieties and facilities,thousands of tissue culture seedlings of 21 Itoh peony varieties imported from abroad were used as test materials,and the peony domestication cultivation method used in the past was used as a control. The technical measures and mechanisms for the outdoor domestication of seedlings and the survival of field transplantation were studied. The results indicate that the main factors and measures for effectively protecting the outdoor transplanting of tissue culture seedlings include cultivating sound and strong seedlings,transplanting in proper period of spring,and providing good ventilating places and facilities,removing leaves,keeping buds and releasing dormancy before transplantation,planting depth should meet the requirement of exposing to the root neck,changing the pots according to the size of seedlings,the substrate should be loose and permeable,seriously disinfected and sterilized,scientific management,and prevention and control of diseases and insect pests. In addition,the survival mechanism was also analyzed,and the reasons and countermeasures for the successful application of peony tissue culture in China were found. Finally,the differences in survival rates between different varieties and facilities were summarized. | Xianglong MA Jingxu WU Yixin LIANG Shaohua LIU Yongmei WANG | 2019 | Asian Agricultural Research2019，11，8： | 0 |
| 10 | Shortened processing duration of high-performance Sm-Co-Fe-Cu-Zr magnets by stress-aging显示文摘Simultaneously achieving high energy product and high coercivity in the 2:17-type Sm-Co-Fe-Cu-Zr high temperature magnets has been closely relied on long-term isothermal aging to develop complete cellu-lar nanostructure.In this work,we report a novel stress-aging approach that can substantially shorten the aging time to fabricate high-performance Sm-Co-Fe-Cu-Zr magnets.As exhibited by a model magnet Sm_(25) Co_(50.2) Fe_(16.2) Cu_(5.6) Zr_(3.0)(wt.%),applying 90 MPa compressive stress can shorten the aging time from 20 h for conventional isothermal aging to 10 h at the same aging temperature for achieving nearly equiv-alent magnetic performance.Further comparative study between the 10 h-aged samples under stress-containing and stress-free conditions revealed that the stress not only promotes the precipitation of the cell boundary phase that are essential for enhancing the coercivity but also accelerates the dissociation of the cell edge defects that are detrimental to squareness factor,without destroying the[001]crystal-lographic texture.Such microstructural improvements enable the achievement of high-performance with maximum energy product of∼30 MGOe and coercivity above 35 kOe at reduced aging time. | Xianglong Zhou Tao Yuan Tianyu Ma | 2022 | Journal of Materials Science & Technology2022，，11： | 0 |
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