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Layer-by-layer epitaxy growth of thickness-controllable two-dimensional tungsten disulfide

Science China(Information sciences) 2024年第5期67卷 302-310页

作者： Jieyuan LIANG Zixing ZOU Junwu LIANG Di wang Biao wang Anshi CHU Jiali YI Cheng ZHANG Lizhen FANG Tian ZHANG Huawei LIU Xiaoli ZHU Dong LI Anlian PAN Key Laboratory for Micro-Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan Institute of Optoelectronic IntegrationCollege of Materials Science and Engineering School of Physics and ElectronicsHunan University School of Electronic Information and Electrical Engineering Changsha University School of Physics and Telecommunication Engineering Yulin Normal University Units Semiconductor Technology Co. Ltd. School of Physics and Electronics Hunan Normal University

Bilayer transition metal dichalcogenides（TMDs） balance the high mobility of single layers with the high state density of multilayers and therefore have promising application prospects in high-performance electronics. However, the layer-controlled growth of 2. materials is still confronted with challenges such as poor repeatability between different labs and a limited understanding of the growth mechanism at the atomic scale. Herein, we report a new carbon-assisted chemical vapor deposition process that can realize the growth of WS2.heets with high yield, precise thickness controllability, and repeatability. We show that carbon can act as a reducing agent and catalyst that preferentially reacts with the WO3.recursor to form intermediate WO3.xproducts with low-valence state W. The resulting oxycarbide gas has a low surface adsorption energy when deposited on the surface of as-grown WS2. which provides nucleation sites for the subsequent layer of WS2.rowth and leads to the vertical growth of WS2.heets. The growth mechanism is thoroughly investigated. Electrical transport measurements show that the produced bilayer WS2.ossesses a high carrier mobility(up to 58 cm2.V-1·s-1) and small subthreshold swing（estimated to be 148 mV/decade）,which are among the best reported results for TMDs produced using CVD.

关键词： WS2 thickness-controlled growth chemical vapor deposition additive carbon

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肥胖影响下高血压与高血脂相关联的分子机制研究进展

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中国现代应用药学 2024年第4期41卷 545-555页

作者：许同丽刘钦弘王寅初崔玉琳李文军秦松山东中医药大学青岛中医药科学院济南250000 烟台大学药学院山东烟台264005 中国科学院烟台海岸带研究所山东烟台264003 国家基础学科公共科学数据中心北京100190 中国科学院海洋大科学研究中心山东青岛266071

过去几十年全球肥胖人数不断增多,并且仍然具有上升的趋势,与肥胖随之而来的是心脑血管患病风险的增加。研究发现,身体质量指数增加与一些心脑血管疾病的发生具有相关性。高血压、高血脂作为常见的慢性心血管疾病,受到肥胖影响尤为明显... 详细信息

过去几十年全球肥胖人数不断增多,并且仍然具有上升的趋势,与肥胖随之而来的是心脑血管患病风险的增加。研究发现,身体质量指数增加与一些心脑血管疾病的发生具有相关性。高血压、高血脂作为常见的慢性心血管疾病,受到肥胖影响尤为明显,引起了近年来学术界的广泛关注。不仅如此,肥胖影响下高血压与高血脂的发生是显著关联的,两者的协同作用还能够引发多种心脑血管疾病。目前关于三者相互作用机制的专门研究相对较少。因此,本文在分别总结肥胖影响高血压与高血脂分子机制的基础上,总结归纳肥胖影响下高血压与高血脂相关联的分子机制,指出共同作用分子,为未来心脑血管疾病的研究提供参考。

关键词：肥胖高血压高血脂关联作用机制

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鄂尔多斯盆地神木—榆林地区上石盒子组石千峰组天然气成藏机理

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石油学报 2004年第3期25卷 37-43页

作者：王震亮张立宽孙明亮付金华席胜利刘斌西北大学地质学系大陆动力学教育部重点实验室陕西西安710069 同济大学地下工程系

在对现今流体压力分析的基础上 ,采用泥岩压实研究、砂岩流体包裹体实测和盆地数值模拟技术等多种方法恢复古流体动力分布及其演化规律 ,探讨了鄂尔多斯盆地神木榆林地区上石盒子组石千峰组天然气的成藏条件、成藏期次和成藏类型。... 详细信息

在对现今流体压力分析的基础上 ,采用泥岩压实研究、砂岩流体包裹体实测和盆地数值模拟技术等多种方法恢复古流体动力分布及其演化规律 ,探讨了鄂尔多斯盆地神木榆林地区上石盒子组石千峰组天然气的成藏条件、成藏期次和成藏类型。流体动力学分析表明 ,该地区地质历史上曾存在明显的超压现象 ,现今的常压或负压是后期形成的 ,压力的增、减历史构成了两个过剩压力旋回。在上石盒子组和石千峰组形成天然气聚集的地区 ,垂向上水动力的封隔能力比较薄弱 ,天然气靠自身浮力和下高上低的水动力差异 ,可实现向浅部地层的运移并聚集成藏。在上述流体动力背景下 ,天然气的成藏具有明显的阶段性 :侏罗纪为缓慢成藏阶段 ,白垩纪为快速成藏阶段 ,第三纪第四纪为缓慢调整阶段。所形成的天然气藏包括常规储层条件下的岩性和构造气藏、致密砂岩气藏等类型。上石盒子组石千峰组天然气聚集的主要原因可能与天然气的“烟囱式”

关键词：鄂尔多斯盆地神木-榆林地区上石盒子组石千峰组天然气运移天然气成藏流体动力学

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RESISTIVITY PRECURSORS AND SPREADING OF FAULT PRIOR TO ITS INSTABILITY

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Science in China,Ser.B 1985年第4期28卷 420-436页

作者：王新华祁贵仲赵玉林 institute of geophysics State Seismological Bureau Beijing

Based on fracture mechanics it has been found that earthquake precursors related to volumetric strain e are characterized by quadrants, blind zone and uneven propagation, and the approximate formulae for spreading range of precursor have been obtained. These results are coincident with the information of resistivity ρx observed before the Tangshan earthquake, and then mechanical explanations have been made for some precursors of ρx, such as precursors appearing concentratedly within the period of 1—2.years before the instability of the fault （i.e. subcritical period in which the fault spreads acceleratingly）. Before instability of the spreading of fault, the range of e=10-6 reaches about 150 km, its propagating velocity is about 100 km/yr, the amplification coefficient of ρx is about 104, etc. The half length of fault before instability is about 3.km. It seems that in propagating process the spreading of the fault is delayed by barrier.

关键词： spreading blind propagating approximate volumetric instability formulae contour resistivity appearing

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Synthesis and properties of fluorescent cotton cellulose labeled with norfloxacin

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Science China Chemistry 2009年第3期52卷 351-355页

作者： HU yulin wang BaoYan SU ZhiXing institute of Polymer and Engineering College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China

To expand the application of cellulose in the field of fluorescence techniques, the cotton cellulose was labeled with norfloxacin (Cell-NF) via a three-step reaction, involving alkali treatment, epoxy activation, and opening of the epoxy rings with norfloxacin molecules. And the coordination complexes of Cell-NF with rare earth ions terbium (Cell-NF-Tb) and europium (Cell-NF-Eu) were obtained. The products were detected by IR, TG, XPS, UV and fluorescence spectra. Results showed that the norfloxacin content of the labeled cellulose was about 6.73.w‰ and the start temperature of decomposition of the Cell-NF was raised by 40°C compared with the stock cotton cellulose. When excited at 3.0 nm, the Cell-NF, Cell-NF-Tb, and Cell-NF-Eu in the solid state could emit violet (43. nm), green (549 nm) and red (62. nm) light, respectively.

关键词： modified cotton cellulose luminescence rare earth

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打顶和激素对上部烟叶烟碱的影响及源库关系分析

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河南农业科学 2024年第7期53卷 44-53页

作者：王玉华王德权王玉林张杨董小卫熊莹刘中庆孙延国山东潍坊烟草有限公司山东潍坊261061 中国农业科学院烟草研究所/农业农村部烟草生物学与加工重点实验室山东青岛266101 山东中烟工业有限责任公司山东济南250014

为明确打顶和激素调控烤烟烟碱合成与积累的生理机制,以烤烟品种K3.0}为材料,研究了不同打顶措施与激素互作处理对烤烟根系、上部叶片性状,上部叶烟碱、总氮含量,根系氮代谢关键酶活性及烟碱合成与运输基因表达的影响,并分析烟碱积累的... 详细信息

为明确打顶和激素调控烤烟烟碱合成与积累的生理机制,以烤烟品种K3.0}为材料,研究了不同打顶措施与激素互作处理对烤烟根系、上部叶片性状,上部叶烟碱、总氮含量,根系氮代谢关键酶活性及烟碱合成与运输基因表达的影响,并分析烟碱积累的源库关系。结果表明,打顶显著提高上部烟叶烟碱含量与积累量,分别是不打顶处理的1.41倍、1.85倍;不打顶时喷施茉莉酸甲酯(MeJA)显著增加烟碱含量,增幅为14.60%,喷施N-1-氨甲酰苯甲酸萘酯(NPA)显著降低烟碱含量,降幅为10.01%;打顶后喷施水杨苷异羟肟酸(SHAM)、萘乙酸(NAA)显著降低烟碱含量,降幅分别为2..07%、16.92.。茉莉酸(JA)对根系发育的影响有限,主要通过直接调控烟碱合成与转运基因的表达促进烟碱合成,而生长素(IAA)主要通过调控根系发育间接影响烟碱合成与积累。通径分析显示,根系性状中根尖数对烟碱积累的直接作用最大,根表面积对烟碱积累的总作用最大,是影响烟碱合成的主要“源”指标;叶片性状中叶面积对烟碱积累的直接作用最大,叶干质量对烟碱积累的总作用最大,是影响烟碱积累的主要“库”指标。综合分析,打顶后根系IAA含量提高,促进根尖数的增加,即增加了烟碱合成“源”数量,同时增强硝酸还原酶(NR)、谷氨酰胺合成酶(GS)活性,促进氮代谢与氮吸收;打顶后根系JA含量增加,直接增强烟碱合成与转运基因PMT、QPT、A62.和NUP1的表达,提高了烟碱合成强度;此外,打顶促进叶面积、叶干质量等“库”容的增大,提高了烟碱积累效率。

关键词：烤烟打顶茉莉酸生长素烟碱源库关系

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Compressed Sensing of Wireless Sensor Networks Data with Missed Measurements

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chinese Journal of Electronics 2015年第2期24卷 388-392页

作者： wang Kai LIU yulin WAN Qun JING Xiaojun Chongqing Communication institute China Electronic System Engineering Company University of Electronic Science and Technology of China Beijing University of Posts and Telecommunications

In Wireless sensor networks(WSNs),missed measurements may be caused by the sensor malfunction and interruption of communication between sensor nodes. The feasibility of exact recovery of WSNs data with missed measurements is analyzed in the framework of compressed sensing. A new incomplete measurement model was developed and the data reconstruction algorithm was proposed. The required number of the missing measurements and the sparsity condition of network data are found for exact compressed sensing of WSNs *** derivation shows that a WSNs data of length N with no more than M/(log(N/M) + 1) nonzero coefficients can be exactly recovered with M Gaussian measurements,provided that fraction of the missed measurements is less than a quarter of the Restricted isometry property(RIP)constant squared. Simulation results validate the theoretical results.

关键词： Wireless sensor networks Compressed sensing Missed measurements Data reconstruction

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Sexual Dimorphism of Inputs to the Lateral Habenula in Mice

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Neuroscience Bulletin 2022年第12期38卷 1439-1456页

作者： Xue Liu Hongren Huang yulin Zhang Liping wang Feng wang Shenzhen Key Lab of Neuropsychiatric Modulation Guangdong Provincial Key Laboratory of Brain Connectome and BehaviorCAS Key Laboratory of Brain Connectome and Manipulationthe Brain Cognition and Brain Disease InstituteShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research InstitutionsShenzhen 518055China University of the chinese academy of sciences Beijing 100049China

The lateral habenula(LHb),which is a critical neuroanatomical hub and a regulator of midbrain monoaminergic centers,is activated by events resulting in negative valence and contributes to the expression of both appetitive and aversive ***,whole-brain cell-type-specific monosynaptic inputs to the LHb in both sexes remain incompletely *** this study,we used viral tracing combined with in situ hybridization targeting vesicular glutamate transporter 2.vGlut2.and glutamic acid decarboxylase 2.Gad2.to generate a comprehensive whole-brain atlas of inputs to glutamatergic andγ-aminobutyric acid(GABA)ergic neurons in the *** found>3. ipsilateral and contralateral brain regions that projected to the *** these,there were significantly more monosynaptic LHb-projecting neurons from the lateral septum,anterior hypothalamus,dorsomedial hypothalamus,and ventromedial hypothalamus in females than in *** interestingly,we found a stronger GABAergic projection from the medial septum to the LHb in males than in *** results reveal a comprehensive connectivity atlas of glutamatergic and GABAergic inputs to the LHb in both sexes,which may facilitate a better understanding of sexual dimorphism in physiological and pathological brain functions.

关键词： vGlut2 Gad2 Monosynaptic inputs Lateral habenula Sex differences Rabies retrograde tracing

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A hybrid spatial-temporal deep learning prediction model of industrial methanol-to-olefins process

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Frontiers of Chemical Science and Engineering 2024年第4期18卷 73-85页

作者： Jibin Zhou Xue Li Duiping Liu Feng wang Tao Zhang Mao Ye Zhongmin Liu National Engineering Research Center of Lower-Carbon Catalysis Technology Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China yulin Innovation institute for Clean Energy Clean Energy Innovation Institute of Chinese Academy of SciencesYulin 719053China Xuelang Industrial Intelligence Technology Co. Ltd.Wuxi 214000China

Methanol-to-olefins,as a promising non-oil pathway for the synthesis of light olefins,has been successfully *** accurate prediction of process variables can yield significant benefits for advanced process control and *** challenge of this task is underscored by the failure of traditional methods in capturing the complex characteristics of industrial processes,such as high nonlinearities,dynamics,and data distribution shift caused by diverse operating *** this paper,we propose a novel hybrid spatial-temporal deep learning prediction model to address these ***,a unique data normalization technique called reversible instance normalization is employed to solve the problem of different data ***,convolutional neural network integrated with the self-attention mechanism are utilized to extract the temporal ***,a multi-graph convolutional network is leveraged to model the spatial ***,the extracted temporal and spatial features are fused as input into a fully connected neural network to complete the ***,the outputs are denormalized to obtain the ultimate *** monitoring results of the dynamic trends of process variables in an actual industrial methanol-to-olefins process demonstrate that our model not only achieves superior prediction performance but also can reveal complex spatial-temporal relationships using the learned attention matrices and adjacency matrices,making the model more ***,this model is deployed onto an end-to-end Industrial Internet Platform,which achieves effective practical results.

关键词： methanol-to-olefins process variables prediction spatial-temporal self-attention mechanism graph convolutional network

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High-Energy Batteries:Beyond Lithium-Ion and Their Long Road to Commercialisation

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Nano-Micro Letters 2022年第6期14卷 116-164页

作者： yulin Gao Zhenghui Pan Jianguo Sun Zhaolin Liu John wang Department of Materials Science and Engineering National University of SingaporeSingapore 117574Singapore ST Engineering Advanced Material Engineering Pte.Ltd. Singapore 619523Singapore institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A*STAR)Singapore 138634Singapore School of Materials Science and Engineering Tongji UniversityShanghai 201804China

Rechargeable batteries of high energy density and overall performance are becoming a critically important technology in the rapidly changing society of the twenty-first *** lithium-ion batteries have so far been the dominant choice,numerous emerging applications call for higher capacity,better safety and lower costs while maintaining sufficient *** design space for potentially better alternatives is extremely large,with numerous new chemistries and architectures being simultaneously *** include other insertion ions(*** and numerous multivalent ions),conversion electrode materials(***,metallic anodes,halides and chalcogens)and aqueous and solid ***,each of these potential“beyond lithium-ion”alternatives faces numerous challenges that often lead to very poor cyclability,especially at the commercial cell level,while lithium-ion batteries continue to improve in performance and decrease in *** review examines fundamental principles to rationalise these numerous developments,and in each case,a brief overview is given on the advantages,advances,remaining challenges preventing cell-level implementation and the state-of-the-art of the solutions to these ***,research and development results obtained in academia are compared to emerging commercial examples,as a commentary on the current and near-future viability of these“beyond lithium-ion”alternatives.

关键词： High energy density Beyond lithium-ion batteries Multivalent-ion batteries Conversion electrode materials Electrolyte

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