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Bandgap opening in MoTe2 thin flakes induced by surface oxidation

Frontiers of physics 2020年第3期15卷 105-111页

作者： Yuan Gan Jiyuan Liang Chang-woo Cho Si Li Yanping Guo Xiaoming Ma xuefeng wu Jinsheng Wen Xu Du Mingquan He Chang Liu Shengyuan A.Yang Kedong Wang Liyuan Zhang National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing210093China Department of Physics Southern University of Science and TechnologyShenzhen518055China School of Physics and Electronics Hunan Normal UniversityChangsha410081China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore487372Singapore Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing100190China Department of Physics and Astronomy Stony Brook UniversityStony BrookNY11794USA Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials College of PhysicsChongqing UniversityChongqing401331China

Recently,the layered transition metal dichalcogenide 1T′-MoTe2 has generated considerable interest due to their superconducting and non-trivial topological ***,we present a systematic study on 1T′-MoTe2 single-crystal and exfoliated thin-flakes by means of electrical transport,scanning tunnelling microscope(STM)measurements and band structure *** a bulk sample,it exhibits large magneto-resistance(MR)and Shubnikov–de Hass oscillations inρxx and a series of Hall plateaus inρxy at low ***,the MoTe2 thin films were intensively investigated with thickness *** samples,without encapsulation,an apparent transition from the intrinsic metallic to insulating state is observed by reducing *** such thin films,we also observed a suppression of the MR and weak anti-localization(WAL)*** attributed these effects to disorders originated from the extrinsic surface chemical reaction,which is consistent with the density functional theory(DFT)calculations and in-situ STM *** contrast to samples without encapsulated protection,we discovered an interesting superconducting transition for those samples with hexagonal Boron Nitride(h-BN)film *** results indicate that the metallic or superconducting behavior is its intrinsic state,and the insulating behavior is likely caused by surface oxidation in few layer 1T’-MoTe2 flakes.

关键词： two-dimensional materials metal-insulator transition layered transition metal dichalcogenides(TMDs) surface oxidation

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Characteristics of long-distance mobile mRNAs from shoot to root in grafted plant species

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Horticultural Plant Journal 2024年第1期10卷 25-37页

作者： Mengmeng Fu Zhen Xu Huaying Ma Yifan Hao Ji Tian Yi Wang Xinzhong Zhang xuefeng Xu Zhenhai Han Ting wu College of Horticulture China Agricultural UniversityBeijing 100193China Plant Science and Technology College Beijing University of AgricultureBeijing 102206China

Thousands of long-distance mobile mRNAs were identified from different grafting systems,based on high-throughput sequencing ***,the long-distance delivery of RNAs was proved to involve multiple ***,we analyzed the homology,motif,and tRNA-like structure(TLS)of long-distance mobile mRNAs identified by RNA-seq as well as the RNA-binding protein(RBP)in nine grafting combinations including Arabidopsis thaliana,Vitis vinifera,Cucumis sativus,Citrullus lanatus,Nicotiana benthamiana,Malus domestica,Pyrus spp.,Glycine max and Phaseolus *** several mRNAs were found to be shared in herbaceous,woody,and related species,the vast majority of long-distance mobile mRNAs were *** non-specific movement-related motifs were identified,while the TLS was not necessary for mRNA long distance *** addition,we found that RBPs were conserved among herbaceous and woody plants as well as related *** paper reports a further in-depth analysis of the endogenous mechanisms by which the species-specific transportable m RNAs were selected by bioinformatics,in order to provide insights for future research on long-distance mobile mRNAs.

关键词： Grafting combination Long-distance mobile mRNA TLS RNA binding proteins

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An electrochemiluminescent magneto-immunosensor for ultrasensitive detection of hs-cTnI on a microfluidic chip

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Nanotechnology and Precision Engineering 2024年第3期7卷 13-23页

作者： Yun Hui Zhen Zhao Weiliang Shu Fengshan Shen Weijun Kong Shengyong Geng Zhen Xu Tianzhun wu Wenhua Zhou xuefeng Yu Shenzhen Key Laboratory of Micro/Nano Biosensing Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055China Biomedical Imaging Science and System Key Laboratory Chinese Academy of SciencesShenzhen 518055China

Sensitive detection and precise quantitation of trace-level crucial biomarkers in a complex sample matrix has become an important area of *** example,the detection of high-sensitivity cardiac troponin I (hs-cTnI) is strongly recommended in clinical guidelines for early diagnosis of acute myocardial *** on the use of an electrode modified by single-walled carbon nanotubes (SWCNTs) and a Ru(bpy)32+-doped silica nanoparticle (Ru@SiO2)/tripropylamine (TPA) system,a novel type of electrochemiluminescent (ECL) magnetoimmunosensor is developed for ultrasensitive detection of *** this approach,a large amount of[Ru(bpy)3]2+is loaded in SiO2(silica nanoparticles) as luminophores with high luminescent efficiency and SWCNTs as electrode surface modification material with excellent electrooxidation ability for ***,a hierarchical micropillar array of microstructures is fabricated with a magnet placed at each end to efficiently confine a single layer of immunomagnetic microbeads on the surface of the electrode and enable 7.5-fold signal enhancement In particular,the use of transparent SWCNTs to modify a transparent ITO electrode provides a two-order-of-magnitude ECL signal amplification.A good linear calibration curve is developed for hs-cTnI concentrations over a wide range from 10 fg/ml to 10 ng/ml,with the limit of detection calculated as 8.720 fg/ml (S/N=3).This ultrasensitive immunosensor exhibits superior detection performance with remarkable stability,reproducibility,and *** recoveries are obtained in the detection of hs-cTnI in human serum,providing a potentia analysis protocol for clinical applications.

关键词： Electrochemiluminescent magneto-immunosensor Microﬂuidic chip High-sensitivity cardiac troponin I Single-walled carbon nanotube [Ru(bpy)3]2+-doped silica nanoparticle

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Adaptive Control of Spacecraft with a Captured Non-Cooperative Object

Adaptive Control of Spacecraft with a Captured Non-Cooperati...

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第37届中国控制会议

作者： Yunpeng Wang Yongchun Xie xuefeng wu Beijing Institute of Control Engineering Science and Technology on Space Intelligent Control Laboratory

This paper studies the control of spacecraft with a non-cooperative captured object. The dynamics parameters of the captured object is unknown. An adaptive position and attitude controller is proposed. It is proven that the combined spacecraft can track the ideal trajectory, if the ideal position, velocity, acceleration and ideal attitude, attitude rate, attitude acceleration are all uniformly bounded. Moreover, the detumbling problem of the combined spacecraft is also addressed in this paper. Finally,some simulation examples are presented to demonstrate the effectiveness of the proposed approaches.

关键词： Adaptive control Parameter uncertainty Non-cooperative Detumbling

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Semi-synthetic chondroitin sulfate CS-semi5 upregulates miR-122-5p,conferring a therapeutic effect on osteoarthritis via the p38/MMP13 pathway

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Acta Pharmaceutica Sinica B 2024年第8期14卷 3528-3542页

作者： Xiang Li Ya Zhou xuefeng Chen Hongjun Wang Shuang Yang Jun Yang Yunfeng Song Zhehui Zhao Haijing Zhang Lianqiu wu State Key Laboratory of Digestive Health Institute of Materia MedicaChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100050China Tide Pharmaceutical Co. Ltd.Beijing 100176China Camford Royal School Beijing 100093China

Osteoarthritis(OA)is an aging-associated disease characterized by joint stiffness pain and destroyed articular *** treatments for OA are limited to alleviating various OA *** is a lack of drugs available in clinical practice that can truly repair cartilage ***,we developed the chondroitin sulfate analog CS-semi5,semi-synthesized from chondroitin sulfate *** vivo,CS-semi5 alleviated inflammation,provided analgesic effects,and protected cartilage in the modified Hulth OA rat model and papain-induced OA rat model.A bioinformatics analysis was performed on samples from OA patients and an exosome analysis on papain-induced OA rats,revealing miR-122-5p as the key regulator associated with CS-semi5 in OA *** prediction revealed that miR-122-5p acted on the 30-untranslated region of p38 mitogen-activated protein kinase,which was related to MMP13 *** in vitro experiments revealed that CS-semi5 effectively reduced cartilage degeneration and maintained matrix homeostasis by inhibiting matrix breakdown through the miR-122-5p/p38/MMP13 axis,which was further validated in the articular cartilage of OA *** is the first study to investigate the semi-synthesized chondroitin sulfate CS-semi5,revealing its cartilageprotecting,anti-inflammatory,and analgesic properties that show promising therapeutic effects in OA via the miR-122-5p/p38/MMP13 pathway.

关键词： Chondroitin sulfate Cartilage Osteoarthritis Extracellular matrix Inflammation miRNA p38 MMP13

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Designing simple non-fused terthiophene-based electron acceptors for efficient organic solar cells

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Journal of Energy Chemistry 2024年第9期96卷 501-508页

作者： Jiayu Li Kun Li Zhe Mei Yu Chen Qian Xie Chenxu Yu xuefeng Liu Yanqi Wang Yishi wu Qing Liao Cunbin An Hongbing Fu Beijing Key Laboratory for Optical Materials and Photonic Devices Department of ChemistryCapital Normal UniversityBeijing 100048China Beijing Synchrotron Radiation Laboratory Institute of High Energy PhysicsChinese Academy of Sciences(CAS)Beijing 100049China

Low-cost photovoltaic materials are essential for realizing large-scale commercial applications of organic solar cells(OSCs).However,highly efficient OSCs based on low-cost photovoltaic materials are scarce due to a deficiency in understanding the structure-property ***,we investigated two low-cost terthiophene-based electron acceptors,namely,3TC8 and 3TEH,with 3,4-bis(octan-3-yloxy)thiophene,differing only in the alkylated *** acceptors exhibit low optical gaps(∼1.43 eV)and possess deep highest occupied molecular orbital(HOMO)levels(∼−5.8 eV).Notably,the single-crystal structure of 3TEH demonstrates highly planar conjugated backbone and strongπ-πstacking between intermolecular terminal groups,attributed to the presence of the bulky alkylated noncovalently conformational *** utilizing both acceptors to fabricate OSCs,the 3TC8-based device exhibited a power conversion efficiency(PCE)of 11.1%,while the 3TEH-based OSC demonstrated an excellent PCE of 14.4%.This PCE is the highest among OSCs based on terthiophene-containing electron *** results offer a new strategy for designing low-cost electron acceptors for highly efficient OSCs.

关键词： Organic solarcells Low cost Terthiophene Non-fused electron acceptor

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基于CSE的大学英语写作促学评价实施路径

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外语界 2022年第4期 31-39页

作者：吴雪峰南京林业大学外国语学院江苏南京210037

本研究基于《中国英语能力等级量表》(CSE),构建包括应用量表和实施测评两个阶段的大学英语写作促学评价实施路径。应用量表阶段,量表描述语经适当处理后用以廓清写作能力、设计写作任务、研制评分标准,确保促学评价实施的科学性及可操... 详细信息

本研究基于《中国英语能力等级量表》(CSE),构建包括应用量表和实施测评两个阶段的大学英语写作促学评价实施路径。应用量表阶段,量表描述语经适当处理后用以廓清写作能力、设计写作任务、研制评分标准,确保促学评价实施的科学性及可操作性。实施测评阶段强调形成性评价与终结性评价相结合,提高学生参与度,积极采用新技术帮助师生获取高质量反馈。英语写作促学评价路径构建是发挥CSE实效的有益尝试,对有效开展英语写作评价具有一定借鉴意义。

关键词：英语写作促学评价中国英语能力等级量表实施路径

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基于循环一致性生成对抗网络的地震数据随机噪声压制方法

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石油地球物理勘探 2021年第5期56卷 958-968,I0007,I0008页

作者：吴学锋张会星中国海洋大学海底科学与探测技术教育部重点实验室山东青岛266100 青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室山东青岛266100

压制随机噪声、提高信噪比是地震数据处理中的关键任务。为此,提出一种基于循环一致性生成对抗网络(CycleGAN)的地震数据随机噪声压制方法。构建的CycleGAN由两个生成器和两个判别器构成,为防止网络退化,生成器由Resnet构成,用以学习含... 详细信息

压制随机噪声、提高信噪比是地震数据处理中的关键任务。为此,提出一种基于循环一致性生成对抗网络(CycleGAN)的地震数据随机噪声压制方法。构建的CycleGAN由两个生成器和两个判别器构成,为防止网络退化,生成器由Resnet构成,用以学习含噪数据与无噪数据之间的特征映射;为提高网络的分辨率和准确性,选用PatchGAN作为判别器;同时,在传统对抗损失的基础上,添加循环一致性损失,用以提升网络训练的稳定性。完成网络构建后,针对模型数据和实际数据调整网络参数,训练和测试网络,分析去噪前后数据的信噪比和均方根误差;并通过计算单道数据频谱,进一步分析局部去噪效果。模型数据和实际数据测试结果表明,该方法能够较好地消除地震数据中的随机噪声,且去噪效果优于小波阈值去噪方法,从而验证了所提方法的可行性。

关键词： CycleGAN 地震数据随机噪声去噪

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Analysis of operation-related complications of totally laparoscopic aortoiliac surgery

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Chinese Medical Journal 2014年第7期127卷 1218-1221页

作者： Qi Lixing Gu Yongquan Guo Lianrui Li xuefeng wu Yingfeng Cui Shijun Tong Zhu wu Xin Guo Jianming Zhang Jian Wang Zhonggao Department of Vascular Surgery Xuanwu Hospital Institute of Vascular Surgery Capital Medical University Beijing 100053 China

Background Totally laparoscopic aortoiliac surgery has been newly developed in *** is known as the most complex laparoscopic technique to learn because of its high-risk *** of the operation-related complications of this surgery is supposed to be helpful for the early success of this *** Twelve male patients （56-70 years old） with aortoiliac occlusive disease underwent totally laparoscopic aortoiliac bypass surgery （TLABS） in our *** data and operation-related complications were retrospectively *** Of the 12 patients,TLABS succeeded in nine and conversion to open surgery occurred in *** of the converted patients finally died of pulmonary ***-related complications included bleeding from arterial injury,perforation from colonic injury,graft embolism,residual aortic stenosis,and *** in two patients and colonic perforation in one patient resulted in three conversions to open *** graft embolectomy and postoperative aortic stenting were performed to resolve the thrombus/embolus-referring *** hydronephrosis,which was thought to result from intraoperative injury and treated with ureteric intubation drainage,recovered 6 months after *** Good understanding and avoidance of operation-related complications are important to guarantee the technical success of *** conversion to open surgery is necessary for saving the patient＇s life in case of lifethreatening complications.

关键词： totally laparoscopic aortoiliac surgery complication operation-related

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2.0时代视域下职业教育信息化的推进逻辑与模式选择

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职教论坛 2020年第2期36卷 6-11页

作者：吴学峰徐州工程学院教育科学学院

职业教育信息化是职业教育领域适应信息社会的必然要求和结果。随着新一轮信息技术发展的引入,职业教育信息化向2.0时代迈进,受其影响,职业教育信息化由重视"物"的投入逐步转向关注"人"的发展。进而,在具体推进过程中呈现出明显的时代逻... 详细信息

职业教育信息化是职业教育领域适应信息社会的必然要求和结果。随着新一轮信息技术发展的引入,职业教育信息化向2.0时代迈进,受其影响,职业教育信息化由重视"物"的投入逐步转向关注"人"的发展。进而,在具体推进过程中呈现出明显的时代逻辑:第一,以人的培养为目标,促进信息技术与职业教育的创新融合;第二,以提升学习效果为关键,为学校教育与岗位学习相结合提供技术支持。然而,过多强调硬件建设而忽视教育教学本身的需要,以及仅从信息有效传播的角度,借助技术手段优化教育教学过程中的信息传递过程而忽视学习者的需要,都不利于职业教育信息化的有序推进。在2.0时代背景下,职业教育信息化在发展模式的选择上,应尽力克服技术优先模式和信息传播优先模式的不足,努力从内容、过程和情境三个方面构建有利于实践共同体创建的信息化支持模式。

关键词： 2.0时代职业教育信息化发展转向模式选择

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