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Persistence of charge density wave against variation of band structures in V_(x)Ti_(1−x)Se_(2)(x=0–0.1)

Nano Research 2024年第3期17卷 2129-2135页

作者： zhanfeng liu Tongrui Li Wen Zhu Hongwei Shou Mukhtar Lawan Adam Qilong Cui Yuliang Li Sheng Wang Yunbo Wu Hongen Zhu Yi liu Shuangming Chen Xiaojun Wu Shengtao Cui Li Song Zhe Sun National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230029China CAS Key Laboratory of Strongly-coupled Quantum Matter Physics University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China School of Chemistry and Materials Sciences CAS Key Laboratory of Materials for Energy Conversionand CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230026China School Zhejiang Institute of Photonelectronics Jinhua 321004China

Charge density wave(CDW)is a phenomenon that occurs in materials,accompanied by changes in their intrinsic electronic *** study of CDW and its modulation in materials holds tremendous significance in materials research,as it provides a unique approach to controlling the electronic properties of ***_(2) is a typical layered material with a CDW phase at low *** V substitution for Ti in TiSe_(2),we tuned the carrier concentration in V_(x)Ti_(1-x)Se_(2) to study how its electronic structures ***-resolved photoemission spectroscopy(ARPES)shows that the band-folding effect is sustained with the doping level up to 10%,indicating the persistence of the CDW phase,even though the band structure is strikingly different from that of the parent compound TiSe_(2).Though CDW can induce the band fold effect with a driving force from the perspective of electronic systems,our studies suggest that this behavior could be maintained by lattice distortion of the CDW phase,even if band structures deviate from the electron-driven CDW *** work provides a constraint for understanding the CDW mechanism in TiSe_(2),and highlights the role of lattice distortion in the band-folding effect.

关键词： charge density wave band structure lattice distortion

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基于深度学习的TC32钛合金BTA深孔钻削容屑系数和切屑形态研究

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制造技术与机床 2024年第4期 57-62页

作者：冯亚洲陶觅辰刘战锋孔浩西安石油大学机械工程学院陕西西安710065 陕西深孔智越科技有限公司陕西西安710077

在钛合金深孔钻削过程中,由于其难加工性经常会存在刀具磨损严重、排屑困难和内孔表面质量差等问题。为了获得具有良好内孔表面质量和切屑形态的钛合金深孔类零件,以新型钛合金TC32为研究对象,在不同工艺参数下基于深度学习和BP神经网... 详细信息

在钛合金深孔钻削过程中,由于其难加工性经常会存在刀具磨损严重、排屑困难和内孔表面质量差等问题。为了获得具有良好内孔表面质量和切屑形态的钛合金深孔类零件,以新型钛合金TC32为研究对象,在不同工艺参数下基于深度学习和BP神经网络进行了TC32钛合金的容屑系数预测和加工试验验证。研究结果表明:预测模型的决定系数R 2为0.921,拟合程度和精度较高,预测性能良好;当进给量为0.08 mm/r、主轴转速为435 r/min时容屑系数为5.6,切屑形态以C形屑和短带状屑为主,排屑顺畅且加工过程稳定。

关键词：深度学习 BP神经网络 BTA深孔钻削 TC32钛合金容屑系数

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Charge density wave phase suppression in 1T-TiSe_(2) through Sn intercalation

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Nano Research 2022年第3期15卷 2643-2649页

作者： Mukhtar Lawan Adam Hongen Zhu zhanfeng liu Shengtao Cui Pengjun Zhang Yi liu Guobin Zhang Xiaojun Wu Zhe Sun Li Song National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei230029China Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy ConversionSynergetic Innovation of Quantum Information&Quantum TechnologySchool of Chemistry and Materials Sciencesand CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230026China CAS key Laboratory of Strongly-coupled Quantum Matter Physics University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050China Physics Department Bayero UniversityKano 700231Nigeria

Taking advantage of the unique layered structure of TiSe2,the intrinsic electronic properties of two-dimensional materials can easily be tuned via heteroatomic ***,we show that the charge density wave(CDW)phase in 1T-TiSe_(2) single-crystals can be gradually suppressed through Sn atoms *** angle-resolved photoemission spectroscopy(ARPES)and temperature-dependent resistivity measurements,this work reveals that Sn atoms can induce charge doping and modulate the intrinsic electronic properties in the host 1T-TiSe_(2).Notably,our temperature-dependent ARPES results highlight the role exciton-phonon interaction and the Jahn-Teller mechanism through the formation of backfolded bands and exhibition of a downward Se shift of 4p valence band in the formation of CDW in this material.

关键词： charge density wave angle-resolved photoemission spectroscopy(ARPES) charge doping intercalation first-principles single-crystals

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Acetyl coenzyme A carboxylase modulates lipogenesis and sugar homeostasis in Blattella germanica

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Insect Science 2024年第2期31卷 387-404页

作者： Xiaojin Pei Tiantian Bai Yuan Luo zhanfeng Zhang Sheng Li Yongliang Fan Tong-Xian liu Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology and Institute of Insect Science and Technology School of Life SciencesSouth China Normal UniversityGuangzhouChina State Key Laboratory of Crop Stress Biology for Arid Areas and Key Laboratory of Integrated Pest Management on Crops in Northwestern Loess Plateau Ministry of AgricultureNorthwest A&F UniversityYanglingShaanxiChina Guangmeiyuan R&D Center Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied TechnologySouth China Normal UniversityMeizhouGuangdong ProvinceChina Institute of Entomology Guizhou UniversityGuiyangChina

Lipid and sugar homeostasis is critical for insect development and *** this study,we characterized an acetyl coenzyme A carboxylase gene in Blattella germanica(BgACC)that is involved in both lipogenesis and sugar *** found that BgACC was dominantly expressed in the fat body and integument,and was significantly upregulated after *** of BgACC in 5th-instar nymphs did not affect their normal molting to the next nymphal stage,but it caused a lethal phenotype during adult ***-RNA interference(RNAi)significantly downregulated total free fatty acid(FFA)and triacylglycerol(TAG)levels,and also caused a significant decrease of cuticular hydrocarbons(CHCs).Repression of BgACC in adult females affected the development of oocytes and resulted in sterile females,but BgACC-RNAi did not affect the reproductive ability of ***,knockdown of BgACC also changed the expression of insulin-like peptide genes(BglLPs),which mimicked a physiological state of high sugar *** addition,BgACC was upregulated when *** were fed on a high sucrose diet,and repression of BgACC upregulated the expression of the glycogen synthase gene(BgGlyS).Moreover,BgACC-RNAi increased the circulating sugar levels and glycogen storage,and a longevity assay suggested that BgACC was important for the survival of *** under conditions of high sucrose *** results confirm that BgACC is involved in multiple lipid biogenesis and sugar homeostasis processes,which further modulates insect reproduction and sugar *** study benefits our understanding of the crosstalk between lipid and sugar metabolism.

关键词： acetyl-CoA carboxylase German cockroach lipid biosynthesis sugar tolerance

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Superconducting properties and topological nodal lines features in centrosymmetric Sn_(0.5)TaSe_(2)

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Nano Research 2021年第8期14卷 2613-2619页

作者： Mukhtar LAdam zhanfeng liu Oyawale A.Moses Xiaojun Wu Li Song National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceCAS Key Laboratory of Strongly Coupled Quantum Matter PhysicsUniversity of Science and Technology of ChinaHefei 230029China Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy ConversionSynergetic Innovation of Quantum Information&Quantum TechnologySchool of Chemistry and Materials Sciencesand CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230026China Physics Department Bayero UniversityKano 700231Nigeria

Nontrivial topological behaviors in superconducting materials provide resourceful ground for the emergence and study of unconventional quantum *** doping by the controlled intercalation of donor atoms is an efficient route for enhancing/inducement of superconducting and topological behaviors in layered topological insulators and ***,we enhanced the superconducting temperature of TaSe_(2) by 20-folds(~3 K)through Sn atoms *** first-principles calculations,we demonstrated the existence of nontrivial topological ***_(0.5)TaSe_(2) displays topological nodal lines around the K high symmetry point in the Brillouin zone,with drumhead-like shaped surface states protected by inversion ***,the coexistence of these properties makes Sn_(0.5)TaSe_(2) a potential candidate for topological superconductivity.

关键词： superconductivity topological semimetal charge doping intercalation first-principles single-crystals

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基于新媒体的12117人新型冠状病毒疫苗认知水平和第二次加强免疫接种意愿及影响因素分析

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现代疾病预防控制 2024年第1期35卷 6-10,25页

作者：路明霞李致远白祎然王长双刘占峰赵红玉徐瑾张延炀河南省疾病预防控制中心河南郑州450016 郑州大学公共卫生学院郑州市郑东新区民生路社区卫生服务中心

目的了解公众对新型冠状病毒疫苗(简称新冠疫苗)认知水平和第二次加强免疫接种意愿。方法 2022年11月通过网络问卷对微信公众号受众群体新冠疫苗认知、第二次加强免疫接种意愿、疫苗种类选择等进行调查,对所得数据进行χ^(2)检验和多因... 详细信息

目的了解公众对新型冠状病毒疫苗(简称新冠疫苗)认知水平和第二次加强免疫接种意愿。方法 2022年11月通过网络问卷对微信公众号受众群体新冠疫苗认知、第二次加强免疫接种意愿、疫苗种类选择等进行调查,对所得数据进行χ^(2)检验和多因素logistic回归分析。结果共收回有效问卷12 117份,调查对象新冠疫苗覆盖率99.04%,疫苗高认知比例为80.37%,不同人群认知水平存在差异(P均<0.05)。9 526名完成第一次加强免疫人群中,85.87%愿意接种第二次加强免疫。相较于参照组,新冠疫苗高认知(OR=4.012)、关注疫苗有效性(OR=2.878)、关注接种便利性(OR=4.037)、最信任信息获取途径为单位或社区通知(OR=13.243)、最信任信息获取途径为新媒体(OR=9.112)等是第二次加强免疫接种意愿的促进因素。结论公众对新冠疫苗认知程度高,第二次加强免疫接种意愿整体较高。社区组织发动、专业机构利用新媒体开展宣传教育、优化接种体验等措施将有助于提高接种意愿。

关键词：新型冠状病毒疫苗认知加强免疫接种意愿

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Plant community and soil properties drive arbuscular mycorrhizal fungal diversity:A case study in tropical forests

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Soil Ecology Letters 2021年第1期3卷 52-62页

作者： Jing Zhang Changxin Quan Lingling Ma Guowei Chu zhanfeng liu Xuli Tang Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Center for Plant Ecology Core Botanical GardensChinese Academy of SciencesGuangzhou510650China

The mutual interdependence of plants and arbuscular mycorrhizal fungi(AMF)is important in carbon and mineral nutrient ***,an understanding of how AMF community assemblies vary in different forests and the underlying factors regulating AMF diversity in native tropical forests is largely *** explored the AMF community assembly and the underlying factors regulating AMF diversity in a young(YF)and an old-growth forest(OF)in a tropical *** results showed that a total of 53 AMF phylogroups(virtual taxa,VTs)were detected,38±1 in the OF and 34±1 in the YF through high-throughput sequencing of 18S rDNA,and AMF community composition was significantly different between the two forests.A structural equation model showed that the forest traits indirectly influenced AMF diversity via the plant community,soil properties and microbes,which explained 44.2%of the total observed variation in AMF *** diversity and biomass were the strongest predictors of AMF diversity,indicating that AMF diversity was dominantly regulated by biotic factors at our study *** study indicated that forest community traits have a predictable effect on the AMF community;plant community traits and soil properties are particularly important for determining AMF diversity in tropical forests.

关键词： Arbuscular mycorrhizal fungi High-throughput sequencing Microbes Plant community traits Soil properties Tropical forests

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长期磷添加对热带森林土壤磷酸单酯酶与磷酸二酯酶活性比值的影响

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Journal of Plant Ecology 2023年第3期16卷 203-207页

作者： Taiki Mori Senhao Wang Cong Wang Ji Chen Cheng Peng Mianhai Zheng Juan Huang Faming Wang zhanfeng liu Jiangming Mo Wei Zhang Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems Guangdong Provincial Key Laboratory of Applied BotanySouth China Botanical GardenChinese Academy of SciencesGuangzhou 510650China Kyushu Research Center Forestry and Forest Products Research InstituteFFPRIKurokami 4-11-16Kumamoto 860-0862Japan Center for Plant Ecology Core Botanical GardensChinese Academy of SciencesGuangzhou 510650China State Key laboratory of Mycology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China Department of Agroecology Aarhus University8830 TjeleDenmark Aarhus University Centre for Circular Bioeconomy Aarhus University8830 TjeleDenmark iCLIMATE Interdisciplinary Centre for Climate Change Aarhus University4000 RoskildeDenmark University of Chinese Academy of Sciences Beijing 100049China

热带森林土壤微生物可以通过改变不同类型的磷酸酶活性来适应低磷的环境。以往的研究认为,低磷环境中土壤微生物更倾向于分解有机磷单酯键而非二酯键。因此,磷酸单酯酶(PME)的活性变化对生态系统磷输入的响应可能更敏感,其与磷酸二酯酶(... 详细信息

热带森林土壤微生物可以通过改变不同类型的磷酸酶活性来适应低磷的环境。以往的研究认为,低磷环境中土壤微生物更倾向于分解有机磷单酯键而非二酯键。因此,磷酸单酯酶(PME)的活性变化对生态系统磷输入的响应可能更敏感,其与磷酸二酯酶(PDE)活性的比值在磷输入后将显著降低。为了检验土壤微生物在低磷的热带森林中对不同磷酸酶的“投资”策略,我们在鼎湖山3种热带森林进行了长达10年的磷添加实验。与以往的研究不同,本研究发现长期磷添加没有改变原生林与次生林的PME:PDE比值,但显著提高了人工林土壤PME:PDE比值。结果表明,长期磷添加可能减少了凋落物或穿透雨来源的PDE,从而使其土壤PDE活性下降较PME降低更快,因而PME:PDE比值未能降低。

关键词：土壤胞外酶磷酸单酯酶磷酸二酯酶施磷热带森林

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A non-rigid shift of band dispersions induced by Cu intercalation in 2H-TaSe2

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Nano Research 2020年第2期13卷 353-357页

作者： Pengdong Wang Rashid Khan zhanfeng liu Bo Zhang Yuliang Li Sheng Wang Yunbo Wu Hongen Zhu Yi liu Guobin Zhang Dayong liu Shuangming Chen Li Song Zhe Sun National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesP.0.Box 1129Hefei 230031China Key Laboratory of Strongly-coupled Quantum Matter Physics Chinese Academy of SciencesUniversity of Science and Technology of ChinaHefei 230026China CAS Centerfor Excellence in Superconducting Electronics(CENSE) Shanghai 200050China

The intercalation of metal is a promising method for the modulating electronic properties in transition metal dichalcogenides(TMDs).However,there still lacks enough knowledge about how the intercalated atoms directly impact the two-dimensional structural layers and modulate the band structures *** advantage of X-ray absorption fine structure and angle-resolved photoemission spectroscopy,we studied how Cu intercalation influences the host TaSe2 layers in Cu0.03TaSe2 *** intercalated Cu atoms form bonds with Se of the host layers,and there is charge transfer from Cu to *** examining the changes of band dispersions,we show that the variation of electronic structures is beyond a simple rigid band model with merely charge doping *** work'reveals that the unusual change of band dispersions is associated with the formation of bonds between the intercalated metal elements and anion ions in the host layers,and provides a reference for the comprehensive understanding of the electronic structures in intercalated materials.

关键词： transition metal dichalcogenides Cu-intercalation band shift angle resolved photoemission spectroscopy

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Influences of sample storage and grinding on the extraction of soil amino sugars

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Soil Ecology Letters 2020年第2期2卷 157-163页

作者： Zhijian Mou Luhui Kuang Biyue Yan Xinyu Zhang Yunqiang Wang zhanfeng liu Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems&CAS Engineering Laboratory for Vegetation Ecosystem Restoration on Islands and Coastal Zones South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China

Soil amino sugars have been widely used to evaluate the potential roles of microbes in mediating soil carbon(C)cycling and various pretreatment methods were used for its ***,few studies assessed their potential influences on the soil amino sugar *** this study,we investigated the effects of sample storage method and grinding on amino sugar extraction across different climatic zones and land *** showed that the concentrations of soil amino sugars varied greatly among sample pretreatments and their impacts were highly dependent on climatic condition and land ***,higher concentrations of amino sugars were extracted from field-moist samples than dried samples in subtropical grassland,temperate forest and arable land with no significant differences among storage methods for the samples from subtropical forest,arable land,and temperate ***,grinding improved the extraction efficiency of amino sugars for the dried *** to the reduced extraction concentration in dried soils,field-moist samples were recommended in *** the dried soils used for the long-term storage,grinding can be an option to improve the extraction *** information will be valuable for reducing the uncertainty and improving the accuracy during the determination of soil amino sugars.

关键词： Amino sugars Sample storage Grinding Climate Land use

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