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Integrated high-performance and accurate shaping technology of low-cost powder metallurgy titanium alloys: A comprehensive review

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 413-426页

作者： Xuemeng Gan Shaofu Li shunyuan xiao Yafeng Yang State Key Laboratory of Mesoscience and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Science and Technology on Particle Materials Chinese Academy of SciencesBeijing 100190China

The practical engineering applications of powder metallurgy (PM) Ti alloys produced through cold compaction and pressure-less sintering are impeded by poor sintering densification, embrittlement caused by excessive O impurities, and severe sintering deforma-tion resulting from the use of heterogeneous powder mixtures. This review presents a summary of our previous work on addressing the above challenges. Initially, we proposed a novel strategy using reaction-induced liquid phases to enhance sintering densification. Near- complete density (relative density exceeding 99%) was achieved by applying the above strategy and newly developed sintering aids. By focusing on the O-induced embrittlement issue, we determined the onset dissolution temperature of oxide films in the Ti matrix. On the basis of this finding, we established a design criterion for effective O scavengers that require reaction with oxide films before their dissol-ution. Consequently, a ductile PM Ti alloy was successfully obtained by introducing 0.3wt% NdB6 as the O scavenger. Lastly, a powder- coating strategy was adopted to address the sintering deformation issue. The ultrafine size and shell-like distribution characteristics of coating particles ensured rapid dissolution and homogeneity in the Ti matrix, thereby facilitating linear shrinkage during sintering. As a result, geometrically complex Ti alloy parts with high dimensional accuracy were fabricated by using the coated powder. Our fundament-al findings and related technical achievements enabled the development of an integrated production technology for the high-performance and accurate shaping of low-cost PM Ti alloys. Additionally, the primary engineering applications and progress in the industrialization practice of our developed technology are introduced in this review.

关键词： powder metallurgy titanium sintering densification oxygen scavenging accurate shaping

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Attack-Resilient Distributed Cooperative Control of Virtually Coupled High-Speed Trains via Topology Reconfiguration

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 1066-1068页

作者： shunyuan xiao xiaohua Ge Qing Wu the Institute of Advanced Technology Nanjing University of Posts and TelecommunicationsNanjing 210023China the School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyMelbourne VIC 3122Australia the School of Engineering and Technology Central Queensland UniversityRockhampton QLD 4701Australia

Dear Editor,This letter addresses the resilient distributed cooperative control problem of a virtually coupled train convoy under stochastic disturbances and cyber attacks.The main purpose is to achieve distributed coordination of virtually coupled high-speed trains with the prescribed inter-train distance and same cruise velocity.

关键词： prescribed Speed trains

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Dynamic Event-Triggered Scheduling and Platooning Control Co-Design for Automated Vehicles Over Vehicular Ad-Hoc Networks

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IEEE/CAA Journal of Automatica Sinica 2022年第1期9卷 31-46页

作者： xiaohua Ge shunyuan xiao Qing-Long Han Xian-Ming Zhang Derui Ding Computing and Engineering Technologies Swinburne University of TechnologyMelbourneVIC 3122Australia

This paper deals with the co-design problem of event-triggered communication scheduling and platooning control over vehicular ad-hoc networks(VANETs)subject to finite communication resource.First,a unified model is presented to describe the coordinated platoon behavior of leader-follower vehicles in the simultaneous presence of unknown external disturbances and an unknown leader control input.Under such a platoon model,the central aim is to achieve robust platoon formation tracking with desired inter-vehicle spacing and same velocities and accelerations guided by the leader,while attaining improved communication efficiency.Toward this aim,a novel bandwidth-aware dynamic event-triggered scheduling mechanism is developed.One salient feature of the scheduling mechanism is that the threshold parameter in the triggering law is dynamically adjusted over time based on both vehicular state variations and bandwidth status.Then,a sufficient condition for platoon control system stability and performance analysis as well as a co-design criterion of the admissible event-triggered platooning control law and the desired scheduling mechanism are derived.Finally,simulation results are provided to substantiate the effectiveness and merits of the proposed co-design approach for guaranteeing a trade-off between robust platooning control performance and communication efficiency.

关键词： Automated vehicles dynamic event-triggered communication information flow topology platooning control vehicular ad-hoc networks(VANETs)

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Protein trafficking during plant innate immunity

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Journal of Integrative Plant Biology 2016年第4期58卷 284-298页

作者： Wen-Ming Wang Peng-Qiang Liu Yong-Ju Xu shunyuan xiao Rice Research Institute & Key Laboratory for Major Crop Diseases Sichuan Agricultural University Institute for Bioscience and Biotechnology Research & Department of Plant Science and Landscape Architecture University of Maryland

Plants have evolved a sophisticated immune system to fight against pathogenic microbes. Upon detection of pathogen invasion by immune receptors, the immune system is turned on, resulting in production of antimicrobial molecules including pathogenesis-related（PR） proteins.Conceivably, an efficient immune response depends on the capacity of the plant cell＇s protein/membrane trafficking network to deploy the right defense-associated molecules in the right place at the right time. Recent research in this area shows that while the abundance of cell surface immune receptors is regulated by endocytosis, many intracellular immune receptors, when activated, are partitioned between the cytoplasm and the nucleus for induction of defense genes and activation of programmed cell death, respectively. Vesicle transport is an essential process for secretion of PR proteins to the apoplastic space and targeting of defense-related proteins to the plasma membrane or other endomembrane compartments. In this review, we discuss the various aspects of protein trafficking during plant immunity, with a focus on the immunity proteins on the move and the major components of the trafficking machineries engaged.

关键词： Endocytic trafficking nucleocytoplasmic partitioning programmed cell death small GTPase SNARE vesicle transport

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CRISPR/Cas9-mediated mutagenesis of VvMLO3 results in enhanced resistance to powdery mildew in grapevine(Vitis vinifera)

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Horticulture Research 2020年第1期7卷 1200-1213页

作者： Dong-Yan Wan Ye Guo Yuan Cheng Yang Hu shunyuan xiao Yuejin Wang Ying-Qiang Wen State Key Laboratory of Crop Stress Biology for Arid Areas College of HorticultureNorthwest A&F UniversityYangling 712100 ShaanxiChina Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China Ministry of AgricultureYangling 712100 ShaanxiChina Institute for Bioscience and Biotechnology Research&Department of Plant Sciences and Landscape Architecture University of Maryland College ParkRockvilleMD 20850USA

Grapevine(Vitis vinifera),one of the most economically important fruit crops in the world,suffers significant yield losses from powdery mildew,a major fungal disease caused by Erysiphe necator.In addition to suppressing host immunity,phytopathogens modulate host proteins termed susceptibility(S)factors to promote their proliferation in plants.In this study,CRISPR/Cas9(clustered regularly interspaced short palindromic repeats/CRISPR-associated 9)technology was used to enable the targeted mutagenesis of MLO(mildew resistance Locus O)family genes that are thought to serve as S factors for powdery mildew fungi.Small deletions or insertions were induced in one or both alleles of two grapevine MLO genes,VvMLO3 and VvMLO4,in the transgenic plantlets of the powdery mildew-susceptible cultivar Thompson Seedless.The editing efficiency achieved with different CRISPR/Cas9 constructs varied from 0 to 38.5%.Among the 20 VvMLO3/4-edited lines obtained,one was homozygous for a single mutation,three harbored biallelic mutations,seven were heterozygous for the mutations,and nine were chimeric,as indicated by the presence of more than two mutated alleles in each line.Six of the 20 VvMLO3/4-edited grapevine lines showed normal growth,while the remaining lines exhibited senescence-like chlorosis and necrosis.Importantly,four VvMLO3-edited lines showed enhanced resistance to powdery mildew,which was associated with host cell death,cell wall apposition(CWA)and H2O2 accumulation.Taken together,our results demonstrate that CRISPR/Cas9 genome-editing technology can be successfully used to induce targeted mutations in genes of interest to improve traits of economic importance,such as disease resistance in grapevines.

关键词： resistance Vitis insertion

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市域列车牵引变压器声辐射特性与降噪措施分析

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振动与冲击 2024年第2期43卷 334-342页

作者：黄佳程肖新标王奇杜星周顺元都业林西南交通大学牵引动力国家重点实验室成都610031 西南交通大学电气工程学院成都610031 中车大连机车车辆有限公司城铁开发部辽宁大连116022

为了研究牵引变压器对市域列车车内噪声的影响,建立了牵引变压器电磁场-结构力场-压力声场的多物理场耦合模型和车内噪声仿真模型,分别通过变压器辐射试验和车内噪声试验验证了牵引变压器和车内噪声仿真模型的有效性。牵引变压器噪声仿... 详细信息

为了研究牵引变压器对市域列车车内噪声的影响,建立了牵引变压器电磁场-结构力场-压力声场的多物理场耦合模型和车内噪声仿真模型,分别通过变压器辐射试验和车内噪声试验验证了牵引变压器和车内噪声仿真模型的有效性。牵引变压器噪声仿真模型考虑了铁心材料的各向异性与磁致伸缩的非线性,车内噪声仿真模型考虑了车体结构特征。为了降低变压器对车内噪声的影响,根据牵引变压器辐射噪声产生机理与现场试验结果,从变压器的结构与电磁参数两方面提出了降噪措施。基于所建立的变压器和车内噪声仿真模型,对降噪措施进行了仿真分析。研究结果表明:铁心刚度增加60%与磁通密度降低10%的降噪方案,降噪效果最明显,车内噪声总值分别降低了8.2 dB(A)与4.4 dB(A),且降低铁心磁通密度在50~5000 Hz内对噪声均存在抑制作用;夹件垂向刚度与夹件横向刚度分别增加80%与60%的降噪方案,也可有效降低牵引变压器辐射噪声总值,但仅能抑制一定频率范围内的噪声。

关键词：市域列车牵引变压器声辐射车内噪声降噪

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Construction of Highly Efficient Photocatalyst with Core-Shell Au@Ag/C@SiO_(2)Hybrid Structure towards Visible-Light-Driven Photocatalytic Reduction

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Chinese Journal of Chemistry 2021年第10期39卷 2865-2872页

作者： Huiqin An shunyuan xiao xiaohui Zhao Lifang Cao Ting Liu Mengzhu Li Bing Wang Zhen Yin State Key Laboratory of Separation Membranes and Membrane Processes&School of Chemistry and Chemical Engineering Tiangong UniversityTianjin 300387China Second Oil Production Plant in Chongqing Oilfield QingyongGansu 745106China Beijing Institute of Aerospace Testing Technology Beijing 100048China College of Chemical Engineering and Materials Science Tianjin University of Science and TechnologyTianjin300457 China

Main observation and conclusion Herein,we report a rational construction of Au@Ag/C@SiO_(2)system with Au@Ag core-shell nanoparticles(NPs)as a promising photocatalyst based on the plasmonic coupling effect for the first time towards the photoreduction of nitroaromatic compounds under visible light.The combination and elaborate construction of Au@Ag NPs,carbon microspheres and mesoporous SiO_(2)shell can endow this system with several outstanding features towards photocatalytic reaction.Firstly,the broadband light harvesting across ultraviolet-visible-near infrared(UV-vis-NIR)region can be achieved due to the comprehensive effect of surface plasmonic resonance(SPR)coupling model of Au and Ag,near-field scattering light of carbon microspheres and light reflecting effect of SiO_(2)shell,resulting in the production of more electrons for phororeduction reaction.Secondly,the carbon microspheres in Au@Ag/C@SiO_(2)system possess electron-rich property due to their strong electron-withdrawing ability,which can act as the Lewis acid and Lewis basic site,and promote the stepwise hydrogenation of nitrobenzene.Thirdly,Au@Ag/C@SiO_(2)exhibits excellent reusability because of the protection of SiO_(2)shell,which restricts metal NPs inside the spheres and protects them from aggregation and being lost during reaction process.Our present work demonstrates the significance of construction of hybrid nanostructures based on the plasmonic coupling effect,which can be a promising approach to design efficient photocatalyst towards organic synthesis under visible light.

关键词： Au@Ag nanoparticles Surface plasmon resonance Carbon microspheres Si0_(2)shell Photocatalysis

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Citron C-05 inhibits both the penetration and colonization of Xanthomonas citri subsp.citri to achieve resistance to citrus canker disease

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Horticulture Research 2020年第1期7卷 1981-1992页

作者： Hongyan Fu Mingming Zhao Jing Xu Limei Tan Jian Han Dazhi Li Meijun Wang shunyuan xiao Xianfeng Ma Ziniu Deng College of Horticulture Hunan Agricultural University410128 ChangshaHunanChina National Center for Citrus Improvement 410128 ChangshaHunanChina Hunan Horticultural Research Institute 410125 ChangshaHunanChina Institute for Bioscience and Biotechnology Research&Department of Plant Sciences and Landscape Architecture University of Maryland College ParkRockvilleMD 20850USA

Citrus canker,caused by Xanthomonas citri subsp.citri(Xcc),is a serious bacterial disease that affects citrus production worldwide.Citron C-05(Citrus medica)is the only germplasm in the Citrus genus that has been identified to exhibit strong resistance to Xcc.However,it has not been determined when,where,and how Xcc is restricted in the tissues of Citron C-05 during the infection process.In the present study,we investigated the spatiotemporal growth dynamics of an eGFP-labeled virulent Xcc(eGFP-Xcc)strain in Citron C-05 along with five susceptible biotypes(i.e.,lemon,pummelo,sour orange,sweet orange,and ponkan mandarin)upon inoculation via the spraying or leaf infiltration of a bacterial suspension.The results from extensive confocal laser scanning microscopy analyses showed that while Xcc grew rapidly in plants of all five susceptible genotypes,Xcc was severely restricted in the epidermal and mesophyll cell layers of the leaves of Citron C-05 in the early stage of infection.Not surprisingly,resistance against Xcc in Citron C-05 was found to be associated with the production of reactive oxygen species and hypersensitive response-like cell death,as well as greater upregulation of several defense-related genes,including a pathogenesis-related gene(PR1)and a glutathione S-transferase gene(GST1),compared with sweet orange as a susceptible control.Taken together,our results not only provide further valuable details of the spatiotemporal dynamics of the host entry,propagation,and spread of Xcc in both resistant and susceptible citrus plants but also suggest that resistance to Xcc in Citron C-05 may be attributed to the activation of multiple defense mechanisms.

关键词： citrus Xanthomonas resistance

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ANNEXIN 8 negatively regulates RPW8.1-mediated cell death and disease resistance in Arabidopsis

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Journal of Integrative Plant Biology 2021年第2期63卷 378-392页

作者： Zhi-Xue Zhao Yong-Ju Xu Yang Lei Qin Li Ji-Qun Zhao Yan Li Jing Fan shunyuan xiao Wen-Ming Wang Rice Research Institute and Key Laboratory for Major Crop Diseases Sichuan Agricultural UniversityChengdu 611130China Institute for Bioscience and Biotechnology Research&Department of Plant Science and Landscape Architecture University of MarylandRockvilleMaryland 20850USA

Study on the regulation of broad-spectrum resistance is an active area in plant biology. RESISTANCE TO POWDERY MILDEW 8.1(RPW8.1)is one of a few broad-spectrum resistance genes triggering the hypersensitive response(HR) to restrict multiple pathogenic infections. To address the question how RPW8.1 signaling is regulated,we performed a genetic screen and tried to identify mutations enhancing RPW8.1-mediated HR.Here, we provided evidence to connect an annexin protein with RPW8.1-mediated resistance in Arabidopsis against powdery mildew. We isolated and characterized Arabidopsis b7-6 mutant.A point mutation in b7-6 at the At5 g12380 locus resulted in an amino acid substitution in ANNEXIN8(AtANN8). Loss-of-function or RNA-silencing of AtANN8 led to enhanced expression of RPW8.1,RPW8.1-dependent necrotic lesions in leaves, and defense against powdery mildew. Conversely,over-expression of AtANN8 compromised RPW8.1-mediated disease resistance and cell death. Interestingly, the mutation in AtANN8 enhanced RPW8.1-triggered H2O2. In addition, mutation in AtANN8 led to hypersensitivity to salt stress. Together, our data indicate that AtANN8 is involved in multiple stress signaling pathways and negatively regulates RPW8.1-mediated resistance against powdery mildew and cell death, thus linking ANNEXIN’s function with plant immunity.

关键词： AtANN8 cell death disease resistance H2O2 hypersensitive response powdery mildew RPW8.1

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锂辉石浮选技术现状及发展趋势研究

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矿业研究与开发 2024年第5期44卷 243-250页

作者：何湛祁忠旭孙大勇李杰肖舜元宋水祥长沙矿山研究院有限责任公司湖南长沙410012

为深入研究锂辉石选矿工艺,改善我国锂矿战略资源受限的困境,对锂辉石浮选技术的研究进展进行了系统的总结和评述。首先概述了锂辉石的晶体结构以及影响锂辉石可浮性的因素;然后归纳了锂辉石脱泥和不脱泥浮选工艺的优缺点以及实际应用情... 详细信息

为深入研究锂辉石选矿工艺,改善我国锂矿战略资源受限的困境,对锂辉石浮选技术的研究进展进行了系统的总结和评述。首先概述了锂辉石的晶体结构以及影响锂辉石可浮性的因素;然后归纳了锂辉石脱泥和不脱泥浮选工艺的优缺点以及实际应用情况;最后重点介绍了锂辉石浮选药剂,包括捕收剂和调整剂的新进展及应用现状。指出了目前锂辉石浮选技术存在的问题,并表明在当前趋势下,基于矿物与药剂作用的构效关系研究,筛选和开发高效的浮选药剂是锂辉石浮选技术的主要发展方向之一。研究成果可为锂辉石浮选技术的实际应用和稳健发展提供参考和借鉴。

关键词：锂辉石浮选工艺选矿药剂

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