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A Quantum Monte Carlo Study on Mixed-Spin Chains of 1／2-1／2-1-1 and 3／2-3／2-1-1

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Communications in Theoretical Physics 2003年第5X期40卷 623-630页

作者： XUZhao-xin zhangjun YINGHe-Ping ZhejiangInstituteofModernPhysics ZhejiangUniversityHangzhou310027China PhysicsDepartment XinjiangUniversityUrumqi830046China PhysicsDepaxtment "NationalTaiwanUniversity"Taipei106China

The ground-state and thermodynamic properties of quantum mixed-spin chains of1/2-1/2-1-1and 3/2-3/2-1-1are investigated by a quantum Monte Carlo simulation with the loop-cluster algorithm. For 1/2-1/2-1-1 chain, we find it has two phases separated by an energy-gap vanishing point in the ground-state. For 3/2-3/2-1-1 chain, the numerical results show two energy-gap vanishing points isolated by different phases in its ground-state. Our calculations indicate that all these ground state phases can be understood by means of valence-bond-solid picture, and the thermodynamic behavior at finite temperatures is continuous as a function of parameterα=J2/J1.

关键词：蒙特卡罗模拟混合自旋链铁磁性基态热力学性质能隙

Nested hollow architectures of nitrogen-doped carbon-decorated Fe,Co,Ni-based phosphides for boosting water and urea electrolysis

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Nano Research 2022年第3期15卷 1916-1925页

作者： Jie Zhang Shoushuang Huang Ping Ning Peijun xin Zhiwen Chen Qing Wang Kajsa Uvdal zhangjun Hu Shanghai Applied Radiation Institute School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China Division of Molecular Surface Physics&Nanoscience Department of PhysicsChemistry and BiologyLinköping UniversityLinköping 58183Sweden

Tailoring the nanostructure/morphology and chemical composition is important to regulate the electronic configuration of electrocatalysts and thus enhance their performance for water and urea ***,the nitrogen-doped carbon-decorated tricomponent metal phosphides of FeP4 nanotube@Ni-Co-P nanocage(NC-FNCP)with unique nested hollow architectures are fabricated by a self-sacrifice template *** from the multi-component synergy,the modification of nitrogen-doped carbon,and the modulation of nested porous hollow morphology,NC-FNCP facilitates rapid electron/mass transport in water and urea ***-FNCP-based anode shows low potentials of 248 mV and 1.37 V(*** hydrogen electrode)to attain 10 mA/cm^(2) for oxygen evolution reaction(OER)and urea oxidation reaction(UOR),*** addition,the overall urea electrolysis drives 10 mA/cm^(2) at a comparatively low voltage of 1.52 V(***)that is 110 mV lower than that of overall water electrolysis,as well as exhibits excellent stability over 20 *** work strategizes a multi-shell-structured electrocatalyst with multi-compositions and explores its applications in a sustainable combination of hydrogen production and sewage remediation.

关键词： tri-metal phosphides nested hollow nano-architecture oxygen evolution reaction urea oxidation reaction

Single-wavelength-excited fluorogenic nanoprobe for accurate realtime ratiometric analysis of broad pH fluctuations in mitophagy

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Nano Research 2022年第7期15卷 6515-6521页

作者： xin Zhang Juan Chen Jiwen Hu Anna du Rietz Xiongyu Wu Ruilong Zhang Zhongping Zhang Kajsa Uvdal zhangjun Hu Department of Physics Chemistryand Biology(IFM)Linköping UniversityLinköping SE 58183Sweden School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China

Mitophagy has a critical role in maintaining cellular homeostasis through acidic lysosomes engulfing excess or impaired mitochondria,thereby pH fluctuation is one of the most significant indicators for tracking *** such precise pH tracking demands the fluorogenic probe that has tailored contemporaneous features,including mitochondrial-specificity,excellent biocompatibility,wide pH-sensitive range of 8.0–4.0,and especially quantitative ***,available molecular probes cannot simultaneously meet all the requirements since it is extremely difficult to integrate multiple functionalities into a single *** fully address this issue,we herein integrate two fluorogenic pH sensitive units,a mitochondria-specific block,cellpenetrating facilitator,and biocompatible segments into an elegant silica nano scaffold,which greatly ensures the applicability for real-time tracking of pH fluctuations in *** significantly,at a single wavelength excitation,the integrated pHsensitive units have spectra-distinguishable fluorescence towards alkaline and acidic pH in a broad range that covers mitochondrial and lysosomal pH,thus enabling a ratiometric analysis of pH variations during the whole *** work also provides constructive insights into the fabrication of advanced fluorescent nanoprobes for diverse biomedical applications.

关键词： mitochondrial pH mitophagy ratiometric fluorescence nanoprobe cell imaging

Phosphorus-doped Fe_(7)S_(8)@C nanowires for efficient electrochemical hydrogen and oxygen evolutions:Controlled synthesis and electronic modulation on active sites

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Journal of Materials Science & Technology 2021年第15期74卷 168-175页

作者： Thanh-Tung Le Xiao Liu Peijun xin Qing Wang Chunyan Gao Ye Wu Yongjiang zhangjun Hu Shoushuang Huang Zhiwen Chen School of Environmental and Chemical Engineering Shanghai UniversityShanghai200444China Department of Physics Chemistry and BiologyLinkoping UniversityLinkoping58183Sweden

Developing low-cost,efficient,and stable non-precious-metal electrocatalysts with controlled crystal structure,morphology and compositions are highly desirable for hydrogen and oxygen evolution ***,a series of phosphorus-doped Fe_(7)S_(8)nanowires integrated within carbon(P-Fe_(7)S_(8)@C)are rationally synthesized via a one-step phosphorization of one-dimensional(1D)Fe-based organicinorganic *** as-obtained P-Fe_(7)S_(8)@C catalysts with modified electronic configurations present typical porous structure,providing plentiful active sites for rapid reaction *** functional calculations demonstrate that the doping Fe_(7)S_(8)with P can effectively enhance the electron density of Fe_(7)S_(8)around the Fermi level and weaken the Fe-H bonding,leading to the decrease of adsorption free energy barrier on active *** a result,the optimal catalyst of P-Fe_(7)S_(8)-600@C exhibits a relatively low overpotential of 136 mV for hydrogen evolution reaction(HER)to reach the current density of 10 mA/cm^(2),and a significantly low overpotential of 210 mV for oxygen evolution reaction(OER)at 20 mA/cm^(2)in alkaline *** work presented here may pave the way to design and synthesis of other prominent Fe-based catalysts for water splitting via electronic regulation.

关键词： Ron sulfide P-doping Hydrogen and oxygen evolution reaction Electrocatalysis

Genetic characterization of melon accessions in the U.S. National Plant Germplasm System and construction of a melon core collection

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Molecular Horticulture 2021年第1期1卷 72-84页

作者： xin Wang Kaori Ando Shan Wu Umesh K.Reddy Prabin Tamang Kan Bao Sue A.Hammar Rebecca Grumet James D.McCreight zhangjun Fei Boyce Thompson Institute Cornell UniversityIthacaNY 14853USA U.S.Department of Agriculture-Agricultural Research Service Crop Improvement and Protection Research UnitSalinasCA 93905USA Nunhems USA IncAcampoCA 95220USA Gus R.Douglass Institute and Department of Biology West Virginia State UniversityInstituteWV 25112USA U.S.Department of Agriculture-Agricultural Research Service Natural Products Utilization Research UnitThad Cochran Research CenterP.O.Box 1848OxfordMS 38677USA Department of Horticulture Michigan State UniversityEast LansingMI 48824USA U.S.Department of Agriculture-Agricultural Research Service Robert W.Holley Center for Agriculture and HealthIthacaNY 14853USA.

Melon(*** L.)is an economically important vegetable crop cultivated *** melon collection in the *** Plant Germplasm System(NPGS)is a valuable resource to conserve natural genetic diversity and provide novel traits for melon *** we use the genotyping-by-sequencing(GBS)technology to characterize 2083 melon accessions in the NPGS collected from major melon production areas as well as regions where primitive melons *** structure and genetic diversity analyses suggested that *** *** was firstly introduced from the centers of origin,Indian and Pakistan,to Central and West Asia,and then brought to Europe and *** *** from East Asia was likely derived from *** *** in India and Pakistan and displayed a distinct genetic background compared to the rest of *** accessions from other geographic *** developed a core collection of 383 accessions capturing more than 98%of genetic variation in the germplasm,providing a publicly accessible collection for future research and genomics-assisted breeding of ***-five morphological characters investigated in the core collection indicated high variability of these characters across accessions in the ***-wide association studies using the core collection panel identified potentially associated genome regions related to fruit quality and other horticultural *** study provides insights into melon origin and domestication,and the constructed core collection and identified genome loci potentially associated with important traits provide valuable resources for future melon research and breeding.

关键词： Melon C.melo Germplasm Genetic characterization Core collection Genome-wide association study

A graph-based pan-genome of Brassica oleracea provides new insights into its domestication and morphotype diversification

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Plant Communications 2024年第2期5卷 261-278页

作者： Ning Guo Shenyun Wang Tianyi Wang Mengmeng Duan Mei Zong Liming Miao Shuo Han Guixiang Wang xin Liu Deshuang Zhang Chengzhi Jiao Hongwei Xu Liyang Chen zhangjun Fei Jianbin Li Fan Liu State Key Laboratory of Vegetable Biobreeding National Engineering Research Center for VegetablesBeijing Key Laboratory of Vegetable Germplasm ImprovementKey Laboratory of Biology and Genetics Improvement of Horticultural Crops(North China)Beijing Vegetable Research CenterBeijing Academy of Agriculture and Forestry ScienceBeijing 100097China Jiangsu Key Laboratory for Horticultural Crop Genetic Improvement Vegetable Research InstituteJiangsu Academy of Agricultural ScienceNanjingJiangsuChina Smartgenomics Technology Institute Tianjin 301700China Boyce Thompson Institute IthacaNYUSA

The domestication of Brassica oleracea has resulted in diverse morphological types with distinct patterns of organ *** we report a graph-based pan-genome of *** constructed from high-quality genome assemblies of different *** pan-genome harbors over 200 structural variant hotspot regions enriched in auxin-andflowering-related *** genomic analyses revealed that early domestication of *** focused on leaf or stem *** resulting from agricultural practices and variety improvement were detected among different ***-sweep and pan-genome analyses identified an auxin-responsive small auxin up-regulated RNA gene and a CLAV-ATA3/ESR-RELATED family gene as crucial players in leaf–stem differentiation during the early stage of *** domestication and the BoKAN1 gene as instrumental in shaping the leafy heads of cabbage and Brussels *** pan-genome and functional analyses further revealed that variations in the BoFLC2 gene play key roles in the divergence of vernalization andflowering characteristics among different morphotypes,and variations in thefirst intron of BoFLC3 are involved infine-tuning theflowering process in *** study provides a comprehensive understanding of the pan-genome of *** and sheds light on the domestication and differential organ development of this globally important crop species.

关键词： Brassica oleracea graph-based pan-genome structural variants SV domestication morphotype diversification

The USDA cucumber (Cucumis sativus L.) collection: genetic diversity, population structure, genome-wide association studies, and core collection development

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Horticulture Research 2018年第1期5卷 236-248页

作者： xin Wang Kan Bao Umesh K.Reddy Yang Bai Sue A.Hammar Chen Jiao Todd C.Wehner Axel O.Ramírez-Madera Yiqun Weng Rebecca Grumet zhangjun Fei Boyce Thompson Institute Cornell UniversityIthacaNY14853USA Gus R.Douglass Institute and Department of Biology West Virginia State UniversityInstituteVirginiaWV25112USA Department of Horticulture Michigan State UniversityEast LansingMI48824USA Horticultural Science Department North Carolina State UniversityRaleighNC27695USA Horticulture Department University of WisconsinMadisonWI53706USA USDA-ARS Vegetable Crops Research Unit MadisonWI53706USA USDA-ARS Robert W.Holley Center for Agriculture and Health IthacaNY14853USA

Germplasm collections are a crucial resource to conserve natural genetic diversity and provide a source of novel traits essential for sustained crop *** collection,preservation and utilization of these materials depends upon knowledge of the genetic variation present within the *** we use the high-throughput genotyping-by-sequencing(GBS)technology to characterize the United States National Plant Germplasm System(NPGS)collection of cucumber(Cucumis sativus L.).The GBS data,derived from 1234 cucumber accessions,provided more than 23 K high-quality single-nucleotide polymorphisms(SNPs)that are well distributed at high density in the genome(~1 SNP/10.6 kb).The SNP markers were used to characterize genetic diversity,population structure,phylogenetic relationships,linkage disequilibrium,and population differentiation of the NPGS cucumber *** results,providing detailed genetic analysis of the *** collection,complement NPGS descriptive information regarding geographic origin and phenotypic *** also identified genome regions significantly associated with 13 horticulturally important traits through genome-wide association studies(GWAS).Finally,we developed a molecularly informed,publicly accessible core collection of 395 accessions that represents at least 96%of the genetic variation present in the ***,the information obtained from the GBS data enabled deep insight into the diversity present and genetic relationships among accessions within the collection,and will provide a valuable resource for genetic analyses,gene discovery,crop improvement,and germplasm preservation.

关键词： sustained collection structure

Characterization of Nanocrystallizatin Surface Layer of 0.4C-1Cr Low Alloy Steel Prepared by Ultrasonic Particulate Peening

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材料热处理学报 2004年第05B期25卷 1257-1259页

作者： zhangjun-bao LIUYu-liang ZHAOxin-qi WUJie SONGHong-wei XIONGTian-ying BaosteelTechnologyCenter BaoshanIron＆SteelCO.LTD.ShanghaiChina InstituteofMetalResearch ChineseAcademyofSciencesShenyangChina

A nanostructured surface layer was fabricated in a quenched and tempered 0.4C-lCr low alloy steel by ultrasonic particulate peening technique. The microstructure of the nanocrystalline surface layer was characterized by means of TEM and Mossbauer spectroscopy. Experimental results reveal that both cementite and ferrite nanocrystals with an average size of 5 nm were formed in the surface layer of the steel, phase transformation of austenite and dissolution of cementite maybe occur in the process of ultrasonic paniculate peening.

关键词：显微结构超声波喷丸处理表面毫微结晶 0.4C-1Cr低合金钢

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基于轻量化网络和知识蒸馏的回转窑工况识别

电子测量与仪器学报 2023年第9期37卷 149-159页

作者：王欣邓章俊秦斌湖南工业大学电气与信息工程学院株洲412007

回转窑烧成带图像蕴含丰富火焰信息,准确识别燃烧状态是回转窑优化控制的前提,基于卷积神经网络的方法可以快速识别回转窑工况,提高回转窑自动化水平,但存在网络规模大,所需计算资源多的问题,为此提出了一种基于轻量化网络和知识蒸馏的... 详细信息

回转窑烧成带图像蕴含丰富火焰信息,准确识别燃烧状态是回转窑优化控制的前提,基于卷积神经网络的方法可以快速识别回转窑工况,提高回转窑自动化水平,但存在网络规模大,所需计算资源多的问题,为此提出了一种基于轻量化网络和知识蒸馏的回转窑工况识别方法,在网络卷积层后引入协方差池化层改进教师模型和学生模型,以改进的轻量化网络MobilenetV2作为学生模型的主干网络,以改进的Resnet50作为教师模型的主干网络,通过构建混合蒸馏损失函数,将教师模型蕴含的丰富分类标签信息迁移到学生模型中,并将蒸馏训练得到的学生模型作为回转窑工况识别模型,以提高网络对高相似火焰图像的识别精度。实验结果表明,经蒸馏后的学生模型总体识别准确率相较于原始模型提高了3.33%,对测试集中3种工况的识别率分别达到了93%、99%、90%,准确率和模型规模均优于目前其他主流网络模型,满足实际生产中实时、低成本要求。

关键词：回转窑火焰图像工况识别卷积神经网络轻量化网络知识蒸馏