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Microstructure and properties of gradient nitrided layer on Ti6Al4V alloys

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Rare Metals 2023年第2期42卷 651-663页

作者： Feng Yang Kun-Mao Li xing-jun liu Hong Sun Cui-Ping Wang College of Materials and Fujian Key Laboratory of Materials Genome and Xiamen Key Laboratory of High Performance Metals and Materials Xiamen UniversityXiamen361005China School of Materials and Architectural Engineering Guizhou Normal UniversityGuiyang550001China Bio-Applications and Systems Engineering Tokyo University of Agriculture and TechnologyTokyo184-8588Japan

The vacuum electromagnetic induction nitriding technology was applied to prepare a gradient nitrided layer on the surface of a Ti6Al4V alloy,which possesses TiN andα-Ti(N)***,transmission electron microscopy was conducted to confirm the presence of numerous high-density stacking faults caused by TiN and Ti_(2)N phases distributed on the surface of the alloy,along with a large number of basal stacking faults inside.A highdensity stacking fault led to serious distortion of lattice *** and numerous edge dislocations caused by defects were observed in the subsurface *** the surface layer,the Vickers hardness reached HV_(0.25)1211.30and the residual compressive stress increased,while the nano-hardness increased to 14.07 from 5.31 GPa in the *** micrometre scratch test results indicated that the plasticity and hardness of the nitrided layer changed in a *** 50-μm effective hardened layer depth and surface compressive stress of the Ti6Al4V alloy were enhanced by the stacking faults.

关键词： Ti6Al4V Induction nitriding Gradient layer High-density dislocation Strengthening mechanism

Primary Study on Effects of New Rare Earth Agro-Materials on Potato

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Journal of Rare Earths 2004年第Z1期22卷 265-268页

作者： Yang Qifeng Mao Wanhu Wang Jiachen xing Guo Yang jun liu Xiangsheng Gansu Provincial Agro-Technique Extension Centre Lanzhou 730020 China Gansu Provincial Agro-Technique Extension Centre Lanzhou 730020 China National Rare Earth Centre for Agriculture Beijing 100088 China DingXi County Agro-Technology Extension Centre Gansu 730008China National Rare Earth Centre for Agriculture Beijing 100088 China National Rare Earth Centre for Agriculture Beijing 100088 China

Using common phosphate as a check, we studied the growth and yield of potato by new rare earth agro-materials including rare earth phosphate (base fertilizer), rare earth whole plant nutrient fertilizer, and amino acid chelated rare earth ( top dressing), which were used in a single or mixed way in Dingxi city, Gansu *** results are as follows that ( 1 ) After using new rare earth materials, the plant height increases by 0.4 ～ 5.6 cm and the ripen period is delayed by 4 ～ 9 d.(2) They can improve the potato economic characteristics, enhance productivity, decrease black leg and late *** disease index is decreased by 1.6% ～ 10.6%, single plant potato number increases by 0.3 ～ 0.5, and single plant yield increases by 80 g ～ 130 g.(3) The effect of increased yield is significant, and mixed use is better than single *** the single material treatments, rare earth phosphate is the best, rare earth whole plant nutrient fertilizer and amino acid chelated rare earth are the second, and the increased rate are 14.5%, 8.4%, 9.2% so the material mixture-rare earth phosphate mixed of rare earth whole plant nutrient fertilizer or with amino acid chelated rare earth is economically useable, and increase rate are 25.2% and 24.4% compared with common phosphate.

关键词： potato economic characteristics diseases yield economic useable

Enhanced thermoelectric performance of n-type TiCoSb halfHeusler by Ta doping and Hf alloying

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Rare Metals 2021年第1期40卷 40-47页

作者： Rui-Fang Wang Shan Li Wen-Hua Xue Chen Chen Yu-Mei Wang xing-jun liu Qian Zhang School of Materials Science and Engineering Institute of Materials Genome and Big DataHarbin Institute of TechnologyShenzhen 518055China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of ScienceBeijing 100190China

The p-type TiCoSb-based half-Heuslers are widely studied due to the good electrical transport properties after hole doping,while the pristine TiCoSb is intrinsically *** is thus desired to obtain a comparable n-type counterpart through optimization of electron *** this work,n-type Ti_(0.9-x)HfxTa_(0.1)CoSb half-Heuslers were fabricated by arc melting,ball milling,and spark plasma *** optimized carrier concentration,together with a decreased lattice thermal conductivity,was obtained by Ta doping at the Ti site,leading to a peak figure of merit(ZT)of 0.7 at 973 K in Ti_(0.9)Ta_(0.1)-*** further alloying Hf at the Ti site,the lattice thermal conductivity was significantly reduced without deteriorating the power *** a result,a peak ZT of 0.9 at 973 K and an average ZT of 0.54 in the temperature range of 300-973 K were achieved in Ti_(0.6)Hf_(0.3)Ti_(0.1)*** work demonstrates that n-type TiCoSb-based halfHeuslers are promising thermoelectric materials.

关键词： Thermoelectric Half-Heusler N-type TiCoSb

Phase equilibria in Co-Ti-Re ternary system

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Rare Metals 2023年第8期42卷 2736-2746页

作者： Ling-Ling Li Cui-Ping Wang Shui-Yuan Yang Jia-Jia Han Yong Lu Jin-Bin Zhang xing-jun liu College of Materials and Fujian Provincial Key Laboratory of Materials Genome Xiamen UniversityXiamen 361005China College of Materials Science and Engineering Guangdong Ocean UniversityYangjiang 529500China Xiamen Key Laboratory of High-Performance Metals and Materials Xiamen UniversityXiamen 361005China School of Materials Science and Engineering Institute of Materials Genome and Big DataHarbin Institute of TechnologyShenzhen 518055China

The phase equilibria in the Co-Ti-Re ternary system at 800,1000,1100 and 12000C were studied combined with electron probe microanalyzer(EPMA),X-ray diffraction(XRD),scanning electron microscope(SEM)and transmission electron microscope(TEM).The new phaseτwith a large solubility was discovered at all four isothermal sections,and its structure still needs a further study.A large solubility of Re in the CoTi phase was *** solubility of Re in the Co_(3)Ti phase is6.1%at 800℃,8.7%at 1000℃and 7.7%at 1100℃.The present work could be significant for alloy design of Co-based alloys and thermodynamic analysis of the Co-TiRe ternary system.

关键词： Isothermal section Phase equilibria Co-Ti-Re Co-based supperalloys

Theoretical Exploration of Alloying Effects on Stabilities and Mechanical Properties ofγʹPhase in Novel Co–Al–Nb-Base Superalloys

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1238-1248页

作者： Guan-Cheng Gu Zhao-Jing Han Ze-Yu Chen Zhao-Xuan Li Sheng-Bao Xia Zheng-Ning Li Hua Jin Wei-Wei Xu xing-jun liu Shenzhen Research Institute of Xiamen University School of Aerospace EngineeringXiamen UniversityXiamen361005China Institute of Materials Genome and Big Data Harbin Institute of TechnologyShenzhen518055China

The new developedγ/γʹCo–Al–Nb-base alloys show great potentials as high-temperature ***,finding appropriate compositions to improve performance of alloys still poses a great challenge to the development of Co–Al–Nb-base *** by the lack of alloying effects on fundamental properties of criticalγʹphase,we systematically performed a theoretical investigation on the effect of alloying elements TM(TM:Ti,V,Cr,Zr,Mo,Ta,W,Re,and Ru)on phase stabilities and mechanical properties of L1_(2)-typeγʹ(Co,Ni)_(3)(Al,Nb).By analyzing the stability ofγʹphase with respect to its competitive B2 and D0_(19) phases,the results shown that Ti,V,and Cr enhance the L1_(2) stability and widen the L1_(2)–D0_(19) energy barrier,in which V yields the maximum *** analysis of electronic structure indicated that the alternation of valence electrons at fermi level would be the atomic origin for doping TM inγʹ*** calculated results of mechanical properties shown that V and Cr are expected to be optimal dopant for enhancing the strength and the ductility ofγʹ*** addition of Ta is also beneficial for enhancing the strength at the slight expense of ductility ofγʹ*** drawing the mechanical maps,the preferred composition range for the phases with desired properties is roughly demarcated in theory for the multi-addition of V/Cr and V/Ta inγʹ*** findings would be useful for optimizing the performance of novelγ/γʹCo–Al–Nb-base superalloys.

关键词： Co-Al-Nb-base superalloys γ/γʹdual-phase Phase stability Mechanical properties First-principle methods

Fibroblast growth factor 7 is a nociceptive modulator secreted via large dense-core vesicles

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Journal of Molecular Cell Biology 2015年第5期7卷 466-475页

作者： Hui liu Qing-Feng Wu Jia-Yin Li xing-jun liu Kai-Cheng Li Yan-Qing Zhong Dan Wu Qiong Wang Yin-Jing Lu Lan Bao Xu Zhang Institute of Neuroscience and State Key Laboratory of Neuroscience CAS Center for Excellence in Brain ScienceShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China State Key Laboratory of Cell Biology Institute of Biochemistry and Cell BiologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China School of Life Science and Technology ShanghaiTech UniversityShanghai 201210China

Fibroblast growth factor(FGF)7,a member of FGF family,is initially found to be secreted from mesenchymal cells to repair epithelial ***,its functions in the nervous system are largely *** present study showed that FGF7 was a neuromodulator localized in the large dense-core vesicles(LDCVs)in nociceptive ***7 was mainly expressed in small-diameter neurons of the dorsal root ganglion and could be transported to the dorsal spinal ***,FGF7 was mostly stored in LDCVs that did not contain neuropeptide substance *** recordings in the spinal cord slice showed that buffer-applied FGF7 increased the amplitude of excitatory post-synaptic current evoked by stimulating the sensory afferent *** tests showed that intrathecally applied FGF7 potentiated the formalin-induced acute nociceptive ***,both acute and inflammatory nociceptive responses were significantly reduced in Fgf7-deficient *** results suggest that FGF7 exerts an excitatory modulation of nociceptive afferent transmission.

关键词： fibroblast growth factor 7 dorsal root ganglion large dense-core vesicle nociceptive modulator inflammatory pain

Domain generalization with semi-supervised learning for people-centric activity recognition

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Science China(Information Sciences) 2025年第1期68卷 171-188页

作者： Jing liu Wei ZHU Di LI xing HU Liang SONG Academy for Engineering & Technology Fudan University Shanghai East-bund Research Institute on Networking Systems of AI School of Optoelectronic Information and Computer Engineering University of Shanghai for Science & Technology

People-centric activity recognition is one of the most critical technologies in a wide range of real-world applications,including intelligent transportation systems, healthcare services, and brain-computer interfaces. Large-scale data collection and annotation make the application of machine learning algorithms prohibitively expensive when adapting to new tasks. One way of circumventing this limitation is to train the model in a semi-supervised learning manner that utilizes a percentage of unlabeled data to reduce the labeling burden in prediction tasks. Despite their appeal, these models often assume that labeled and unlabeled data come from similar distributions, which leads to the domain shift problem caused by the presence of distribution gaps. To address these limitations, we propose herein a novel method for people-centric activity recognition,called domain generalization with semi-supervised learning(DGSSL), that effectively enhances the representation learning and domain alignment capabilities of a model. We first design a new autoregressive discriminator for adversarial training between unlabeled and labeled source domains, extracting domain-specific features to reduce the distribution gaps. Second, we introduce two reconstruction tasks to capture the task-specific features to avoid losing information related to representation learning while maintaining task-specific consistency. Finally, benefiting from the collaborative optimization of these two tasks, the model can accurately predict both the domain and category labels of the source domains for the classification task. We conduct extensive experiments on three real-world sensing datasets. The experimental results show that DGSSL surpasses the three state-of-the-art methods with better performance and generalization.

关键词： activity recognition deep learning domain generalization semi-supervised learning adversarial training

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Approach from the laboratory to the field: New strategies in the control of mosquito-borne infectious diseases

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Science China Life Sciences 2025年第1期68卷 303-305页

作者： Ziqian Xu Lianpan Dai jun liu National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases (NITFID) National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and Prevention CAS Key Laboratory of Pathogen Microbiology and Immunology Institute of MicrobiologyChinese Academy of Sciences

Vector-borne viruses, transmitted among humans and animal hosts through bites of vectors such as mosquitoes and ticks,pose a great and ongoing threat to public health and biosafety(Yang et al., 2022).Among them, dengue virus-induced epidemics, have dramatically increased worldwide in recent decades. The report released by the World Health Organization(WHO) at the end of 2023 showed that dengue epidemic globally surged in2023, with the number of reported cases nearing a historical peak.

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Molecular Structure Tailoring of Organic Spacers for High‑Performance Ruddlesden–Popper Perovskite Solar Cells

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Nano-Micro Letters 2025年第2期17卷 314-357页

作者： Pengyun liu Xuejin Li Tonghui Cai Wei xing Naitao Yang Hamidreza Arandiyan Zongping Shao Shaobin Wang Shaomin liu School of Materials Science and Engineering State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum(East China)Qingdao 266580People’s Republic of China School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255049People’s Republic of China Centre for Applied Materials and Industrial Chemistry(CAMIC) School of ScienceRMIT UniversityMelbourneVic 3000Australia WA School of Mines:Minerals Energy and Chemical Engineering(WASM‑MECE)Curtin UniversityPerthWA 6102Australia School of Chemical Engineering The University of AdelaideAdelaideSA 5005Australia School of Engineering Great Bay UniversityDongguan 523000People’s Republic of China

Layer-structured Ruddlesden–Popper(RP)perovskites(RPPs)with decent stability have captured the imagination of the photovoltaic research community and bring hope for boosting the development of perovskite solar cell(PSC)***,two-dimensional(2D)or quasi-2D RP PSCs are encountered with some challenges of the large exciton binding energy,blocked charge transport and poor film quality,which restrict their photovoltaic ***,these issues can be readily resolved by rationally designing spacer cations of *** review mainly focuses on how to design the molecular structures of organic spacers and aims to endow RPPs with outstanding photovoltaic *** firstly elucidated the important roles of organic spacers in impacting crystallization kinetics,charge transporting ability and stability of *** we brought three aspects to attention for designing organic ***,we presented the specific molecular structure design strategies for organic spacers of RPPs aiming to improve photovoltaic performance of RP *** proposed strategies in this review will provide new avenues to develop novel organic spacers for RPPs and advance the development of RPP photovoltaic technology for future applications.

关键词： Ruddlesden-Popper perovskites Low-dimensional perovskite solar cells Organic spacers Molecular structure Design strategies