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unveiling optical anisotropy in disrupted symmetry WSe_(2)/SiP heterostructures

Nano Research 2024年第9期17卷 8585-8591页

作者： Biqi Hu xing Xie Xinyu Ouyang Junying Chen Shaofei Li Jun He Zongwen Liu Jian-tao Wang Yanping Liu Institute of Quantum Physics School of PhysicsCentral South University932 South Lushan RoadChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University932 South Lushan RoadChangsha 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The university of Sydney Nano Institute The University of SydneyNSW 2006Australia Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South university Shenzhen 518000China

Two-dimensional(2D)transition metal dichalcogenides(TMDs)have garnered considerable attention for their promising applications in sensors and optoelectronic devices,owing to their exceptional optical,electronic,and optoelectronic ***,the inherent high symmetry of TMD lattices imposes limitations on their functional ***,we present a strategy to disrupt the C_(3)rotational symmetry of monolayer WSe_(2)by fabricating a heterostructure incorporating WSe_(2)and SiP *** comprehensive experimental investigations and first-principle calculations,we elucidate that in the WSe_(2)/SiP heterostructure,excitons-both neutral and charged-emanating from WSe_(2)exhibit pronounced anisotropy,which remains robust against temperature ***,we observe an anisotropic ratio reaching up to 1.5,indicating a substantial degree of ***,we demonstrate the tunability of exciton anisotropy through the application of a magnetic field,resulting in a significant reduction in the anisotropic ratio with increasing field strength,from 1.57 to ***,the change in heterojunction anisotropy ratio reaches 24.8%as the magnetic field *** findings elucidate that the perturbation of the C_(3)rotational symmetry of the WSe_(2)monolayer arises from a non-uniform charge density distribution within the layer,exhibiting mirror *** results underscore the potential of heterostructure engineering in tailoring the properties of isotropic materials and provide a promising avenue for advancing the application of anisotropic devices across various fields.

关键词： symmetry breaking heterostructure engineering anisotropy optical spectroscopy

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A deep learning model based on contrast-enhanced computed tomography for differential diagnosis of gallbladder carcinoma

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Hepatobiliary & Pancreatic Diseases International 2024年第4期23卷 376-384页

作者： Fei Xiang Qing-tao Meng Jing-Jing Deng Jie Wang Xiao-Yuan Liang xing-Yu Liu Sheng Yan Department of Hepatobiliary Pancreatic Surgery Second Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China Department of Radiology Affiliated Chuzhou First People’s HospitalAnhui Medical UniversityChuzhou 239000China

Background:Gallbladder carcinoma(GBC)is highly malignant,and its early diagnosis remains *** study aimed to develop a deep learning model based on contrast-enhanced computed tomography(CT)images to assist radiologists in identifying ***:We retrospectively enrolled 278 patients with gallbladder lesions(>10 mm)who underwent contrast-enhanced CT and cholecystectomy and divided them into the training(n=194)and validation(n=84)*** deep learning model was developed based on ResNet50 *** and clinical models were built based on support vector machine(SVM)*** comprehensively compared the performance of deep learning,radiomics,clinical models,and three ***:Three radiomics features including LoG_3.0 gray-level size zone matrix zone variance,HHL firstorder kurtosis,and LHL gray-level co-occurrence matrix dependence variance were significantly different between benign gallbladder lesions and GBC,and were selected for developing radiomics *** regression analysis revealed that age≥65 years[odds ratios(OR)=4.4,95%confidence interval(CI):2.1-9.1,P37 u/mL(OR=4.0,95%CI:1.6-10.0,P=0.003)were significant clinical risk factors of *** deep learning model achieved the area under the receiver operating characteristic curve(AuC)values of 0.864(95%CI:0.814-0.915)and 0.857(95%CI:0.773-0.942)in the training and validation datasets,which were comparable with radiomics,clinical models and three *** sensitivity of deep learning model was the highest both in the training[90%(95%CI:82%-96%)]and validation[85%(95%CI:68%-95%)]***:The deep learning model may be a useful tool for radiologists to distinguish between GBC and benign gallbladder lesions.

关键词： Gallbladder carcinoma Computed tomography Deep learning Radiomics

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Camellia sinensis CsMYB4a participates in regulation of stamen growth by interaction with auxin signaling transduction repressor CsAuX/IAA4

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The Crop Journal 2024年第1期12卷 188-201页

作者： Guoliang Ma Mingzhuo Li Yingling Wu Changjuan Jiang Yifan Chen Dawei xing Yue zhao Yajun Liu Xiaolan Jiang tao Xia Liping Gao School of Life Science Anhui Agricultural UniversityHefei 230036AnhuiChina Plant for Human Health Institute Department of Plant and Microbial BiologyNorth Carolina State UniversityKannapolisNC 28081USA State Key Laboratory of Tea Plant Biology and utilization/Key Laboratory of Tea Biology and Tea Processing of Ministry of Agriculture/Anhui Provincial Laboratory of Tea Plant Biology and utilization Anhui Agricultural UniversityHefei 230036AnhuiChina

Subgroup 4(Sg4)members of the R2R3-MYB are generally known as negative regulators of the phenylpropanoid pathway in *** previous research showed that a R2R3-MYB Sg4 member from Camellia sinensis(CsMYB4a)inhibits expression of some genes in the phenylpropanoid pathway,but its physiological function in the tea plant remained ***,CsMYB4a was found to be highly expressed in anther and filaments,and participated in regulating filament *** analysis and exogenous auxin treatment showed that the target of CsMYB4a might be the auxin signal ***/indole-3-acetic acid 4(AuX/IAA4),a repressor in auxin signal transduction,was detected from a yeast two-hybrid screen using CsMYB4a as *** silencing assays showed that both CsIAA4 and CsMYB4a regulate filament *** plants overexpressing CsIAA4 were insensitive to exogenous a-NAA,consistent with overexpression of ***-protein interaction experiments revealed that CsMYB4a interacts with N-terminal of CsIAA4 to prevent CsIAA4 *** out of the endogenous NtIAA4 gene,a CsIAA4 homolog,in tobacco alleviated filament growth inhibition and a-NAA insensitivity in plants overexpressing *** results strongly suggest that CsMYB4a works synergistically with CsIAA4 and participates in regulation of the auxin pathway in stamen.

关键词： AuX/IAA4 Auxin signaling CsMYB4a Subgroup 4 R2R3-MYB

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Work-function-induced interfacial electron redistribution of MoO_(2)/WO_(2) heterostructures for high-efficiency electrocatalytic hydrogen evolution reaction

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Rare Metals 2024年第2期43卷 489-499页

作者： Tong-Fei Li Jing Li Lu-Ping zhang Jia-Wei Ke Meng-xing Fan Li-Fang zhang Cheng-Wei Deng Yi Sun tao Qian Cheng-Lin Yan School of Chemistry and Chemical Engineering Nantong UniversityNantong226019China Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Centre of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing210023China Aerospace Hydrogen Energy Technology(Shanghai)Co.Ltd. Shanghai201800China Key Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical Industry College of EnergySoochow UniversitySuzhou215006China Light Industry Institute of Electrochemical Power Sources Suzhou215006China

The engineering of the electronic configurations of active sites,together with the production of more accessible active sites through heterostructure design,has been established as a forceful methodology for boosting water electrolysis ***,a facile approach is developed to fabricate well-dispersed MoO_(2) and WO_(2) nanoparticles with abundant heterointerfaces entrapped in N,P-doped carbon nanofibers(referred to as MoO_(2)/WO_(2)@N,P-CNFs hereafter)as hydrogen evolution reaction(HER)electrocatalysts in alkaline and acidic *** spectroscopic analyses and theoretical findings manifest that the heterointerface formed by the work function modulation of MoO_(2)/WO_(2) triggers the spontaneous electron redistribution from MoO_(2)to WO_(2) and a built-in electric field,which is essential to promote water adsorption,optimize the H-intermediate adsorption energy,result in the enhanced charge transfer efficiency,and ultimately increase the intrinsic HER ***,the intimate confinement of MoO_(2)/WO_(2) heterostructures in the porous carbon substrate can restrain the active sites from unfavorable coarsening and detachment,thus ensuring facilitated HER kinetics and outstanding structural *** a result,MoO_(2)/WO_(2)@N,P-CNFs exhibit superior catalytic HER performance in acidic and basic solutions,requiring 118 and 95 mV overpotentials to achieve 10 mA·cm^(−2),respectively,surpassing a number of reported non-noble metal-based *** work provides guidelines for the rational design and construction of special metallic heterocomponents with optimized interfacial electronic structure for various electrochemical technologies.

关键词： Electrospinning MoO_(2)/WO_(2) heterostructure Work function Hydrogen evolution reaction

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Quantitative effect of kerogen type on the hydrocarbon generation potential of Paleogene lacustrine source rocks,Liaohe Western Depression,China

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Petroleum Science 2024年第1期21卷 14-30页

作者： Sha-Sha Hui Xiong-Qi Pang Fu-Jie Jiang Chen-Xi Wang Shu-xing Mei tao Hu Hong Pang Min Li Xiao-Long zh.u Kan-Yuan Shi State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China College of Geosciences China University of Petroleum(Beijing)Beijing102249China Exploration and Development Research Institute PetroChina Liaohe Oilfield CompanyPanjin 124010LiaoningChina

Kerogen types exert a decisive effect on the onset and capacity of hydrocarbon generation of source *** source rocks in the Liaohe Western Depression are characterized by thick deposition,high total organic carbon(TOC)content,various kerogen types,and a wide range of thermal ***,their hydrocarbon generation potential and resource estimation can be *** this study,geochemical tests,numerical analysis,hydrocarbon generation kinetics,and basin modeling were integrated to investigate the differential effects of kerogen types on the hydrocarbon generation potential of lacustrine source *** hydrocarbon generation and expulsion(HGE)models of different kerogen types were established quantitatively upon abundant Rock-Eval/TOC/vitrinite reflectance(R_(o))*** sets of good-excellent source rocks deposited in the fourth(Es4),third(Es3),and first(Es1)members of Paleogene Shahejie Formation,are predominantly types I-II_(1),II_(1)-II_(2),and II-III,*** activation energy of types I-II_(2)kerogen is concentrated(180-230 kcal/mol),whereas that of type III kerogen is widely distributed(150-280 kcal/mol).The original hydrocarbon generation potentials of types I,II_(1),II_(2),and III kerogens are 790,510,270,and 85 mg/g TOC,*** Ro values of the hydrocarbon generation threshold for type I-III source rocks gradually increase from 0.42%to 0.74%,and Ro values of the hydrocarbon expulsion threshold increase from 0.49%to 0.87%.Types I and II_(1)source rocks are characterized by earlier hydrocarbon generation,more rapid hydrocarbon expulsion,and narrower hydrocarbon generation windows than types II_(2)and III source *** kerogen types also affect the HGE history and resource *** types(conventional,tight,and shale oil/gas)and three levels(realistic,expected,and prospective)of hydrocarbon resources of different members in the Liaohe Western Depression are *** suggest that t

关键词： Kerogen type Hydrocarbon generation potential Lacustrine source rocks Liaohe western depression

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Structural transition,electric transport,and electronic structures in the compressed trilayer nickelate La_(4)Ni_(3)O_(10)

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Science China(Physics,Mechanics & Astronomy) 2024年第11期67卷 9-15页

作者： Jingyuan Li Cui-Qun Chen Chaoxin Huang Yifeng Han Mengwu Huo xing Huang Peiyue Ma zhengyang Qiu Junfeng Chen Xunwu Hu Lan Chen tao Xie Bing Shen Hualei Sun Dao-Xin Yao Meng Wang Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesSchool of PhysicsSun Yat-sen UniversityGuangzhou 510275China Center for Materials of the universe School of Molecular SciencesArizona State UniversityTempe 85287USA School of Sciences Sun Yat-sen UniversityShenzhen 518107China

Atomic structure and electronic band structure are fundamental properties for understanding the mechanism of superconductivity. Motivated by the discovery of pressure-induced high-temperature superconductivity at 80 K in the bilayer Ruddlesden-Popper nickelate La_(3)Ni_(2)O_(7), the atomic structure and electronic band structure of the trilayer nickelate La_(4)Ni_(3)O_(10) under pressure up to 44.3 GPa are investigated. A structural transition from the monoclinic P2_(1)/a space group to the tetragonal I4/mmm around 12.6-13.4 GPa is identified, accompanied by a drop of resistance below 7 K. Density functional theory calculations suggest that the bonding state of Ni 3d_(z^(2)) orbital rises and crosses the Fermi level at high pressures, which may give rise to possible superconductivity observed in resistance under pressure in La_(4)Ni_(3)O_(10). The trilayer nickelate La_(4)Ni_(3)O_(10) shows some similarities with the bilayer La_(3)Ni_(2)O_(7) and has unique properties, providing a new platform to investigate the underlying mechanism of superconductivity in nickelates.

关键词： La_(4)Ni_(3)O_(10) high pressure synchrotron X-ray diffraction structural transition DFT calculations

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实验室光源的微束X射线荧光成像系统研制及应用研究

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光谱学与光谱分析 2024年第4期44卷 1061-1066页

作者：张文星陶芬刘一邓彪上海理工大学光电信息与计算机工程学院上海200093 中国科学院上海应用物理研究所上海光源中心上海201800 中国科学院上海高等研究院上海光源中心上海201204

微束X射线荧光成像(μ-XRFI)是无损获取样品内部元素微区分布信息的重要方法,主要应用于微米量级区域内的元素分辨成像。同步辐射是μ-XRFI的理想光源,由于其装置庞大、造价高昂,用户机时紧张,并不适宜于常规应用。基于实验室X射线光管... 详细信息

微束X射线荧光成像(μ-XRFI)是无损获取样品内部元素微区分布信息的重要方法,主要应用于微米量级区域内的元素分辨成像。同步辐射是μ-XRFI的理想光源,由于其装置庞大、造价高昂,用户机时紧张,并不适宜于常规应用。基于实验室X射线光管、多毛细管聚焦镜、高精度样品台及硅漂移探测器,研制了一套具有元素分辨的μ-XRFI系统,性能测试结果表明该系统可以测量分析元素含量为0.001%量级的溶液样品和优于20μm的空间分辨能力。基于该μ-XRFI系统开展了应用研究,获得了小鼠脑、芯片及古代陶瓷样品中的多种主要元素及微量元素的空间分布,结果表明该系统可满足μ-XRFI的需求,可为生物医学、电子元件检测、瓷器色彩成分鉴定等领域研究提供帮助。

关键词：实验室X射线光管多毛细管聚焦镜荧光成像元素分辨

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金属离子对二甲亚砜依赖的RNA切割型脱氧核酶催化活性的影响

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高等学校化学学报 2024年第4期45卷 35-42页

作者：崔力李素慧郑星常天俊邴涛河南理工大学资源环境学院焦作454003 中国科学院杭州医学研究所杭州310022

在高浓度有机溶剂中工作的RNA切割型脱氧核酶(RNA-cleaving DNAzyme,RCD)及其构筑的分子器件不仅拓展了DNA作为酶的能力,还可将功能核酸推进新的应用领域.本文研究了一个需要二甲亚砜才能工作的RCD(命名为E3)对金属离子的需求,发现二价... 详细信息

在高浓度有机溶剂中工作的RNA切割型脱氧核酶(RNA-cleaving DNAzyme,RCD)及其构筑的分子器件不仅拓展了DNA作为酶的能力,还可将功能核酸推进新的应用领域.本文研究了一个需要二甲亚砜才能工作的RCD(命名为E3)对金属离子的需求,发现二价金属离子对其催化活性至关重要,活性顺序为Zn^(2+),Mg^(2+)>Fe^(2+)>Pb^(2+)>Mn^(2+)>Co^(2+).以Mg^(2+)或Zn^(2+)为辅因子,表征了E3的速率-pH值关系及其与二者的结合比例.E3的催化速率-pH曲线在Mg^(2+)存在下为“钟形”,高速率的pH值范围为7.0~9.0;Zn^(2+)存在下为“尖峰”,速率最高时pH=7.0;E3与Mg^(2+)和Zn^(2+)的数量结合比例均为1∶1.另外,E3以Fe^(2+)为辅因子时易失活,Fe^(2+)被氧化成Fe^(3+)是失活的关键,加入还原剂可使其复活.进一步研究发现,Cu^(2+),Fe^(3+)和Ni^(2+)等金属离子可抑制Mg^(2+)或Zn^(2+)的作用,使E3的催化活性急剧降低.本文研究结果为理解E3的性质及催化机制提供了有用信息.

关键词： RNA切割型脱氧核酶功能核酸有机溶剂金属离子

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New sustainable polymers with on-demand depolymerization property

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Science China Chemistry 2024年第9期67卷 2803-2841页

作者： Yangyang Sun Zesheng An Yanshan Gao Rongrong Hu Ye Liu Hua Lu Xiao-Bing Lu Xuan Pang Anjun Qin Yong Shen Youhua tao Yu-zhong Wang Junpeng Wang Gang Wu Guang-Peng Wu Tie-Qi Xu xing-Hong zhang Yuetao zhang zhenbiao zhang Jian-Bo zhu Miao Hong zhibo Li State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China State Key Laboratory Base of Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao266042China State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesSouth China University of TechnologyGuangzhou 510640China State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart MaterialsDalian University of TechnologyDalian 116024China Beijing National Laboratory for Molecular Sciences Center for Soft Matter Science and EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)College of ChemistryState Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610064China School of Polymer Science and Polymer Engineering the University of AkronAkronOH 44325USA MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationSuzhou Key Laboratory of Macromolecular Design and Precision SynthesisCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

To combat the crisis of today's synthetic polymers arising from unsustainable production and disposal,it is essential for the synthetic polymer community to reshape the current polymer industry with sustainable *** an emerging class of sustainable polymers,the development of chemically depolymerizable polymers(CDPs),which can undergo closed-loop depolymerization/repolymerization cycles to reproduce virgin polymers without the loss of properties from recovered monomers,offers an ideal solution to preserve finite natural resources,provides a feasible solution to the end-of-life issue of polymer waste,and thereby establishes a circular materials ***,two grand key challenges have been encountered in the establishment of practically useful CDPs:how to balance polymerization and depolymerization ability and how to unify conflicted depolymerizability and physical ***,this critical review article presents our vision for summarizing feasible strategies to overcome the above two significant challenges and the design principles for constructing an ideal CDP by highlighting selected major progress made in this rapidly expanding field.

关键词： chemically depolymerizable polymers sustainable polymers depolymerization monomer recovery degradation plastics

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Effect of wire diameter compression ratio on drawing deformation of micro copper wire

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Transactions of Nonferrous Metals Society of China 2024年第8期34卷 2605-2618页

作者： tao HuANG Han-jiang Wu Ke-xing SONG Yan-min zhANG Yan-jun zh.u Shao-lin LI School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China Henan Key Laboratory of Advanced Conductor Materials Institute of MaterialsHenan Academy of SciencesZhengzhou 450000China

A crystal plasticity finite element model was developed for the drawing deformation of pure copper micro wire,based on rate-dependent crystal plasticity *** impact of wire diameter compression ratio on the micro-mechanical deformation behavior during the wire drawing process was *** indicate that the internal deformation and slip of the drawn wire are unevenly distributed,forming distinct slip and non-slip ***,horizontal strain concentration bands develop within the drawn *** the wire diameter compression ratio increases,the strength of the slip systems and the extent of slip zones inside the deformation zone also ***,the fluctuating stress state,induced by contact pressure and frictional stress,results in a rough and uneven wire surface and diminishes the stability of the drawing process.

关键词： micro copper wire drawing deformation crystal plasticity finite element slip mode

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