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Highly sensitive flexible strain sensor based on the two-dimensional semiconductor tellurium with a negative gauge factor

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Science China(Information Sciences) 2024年第7期67卷 295-304页

作者： Jiarui HE Yusong QU Shengyao CHEN Cong WANG Lena du xiaoshan du Yuanyuan ZHENG Guozhong ZHAO He TIAN College of Mathematics and Physics Beijing University of Chemical Technology School of Integrated Circuits Tsinghua University Beijing China & The Beijing National Research Center for Information Science and Technology (BNRist)Tsinghua University CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology &University of Chinese Academy of Sciences Beijing Key Lab of Terahertz Spectroscopy and Imaging Key Lab of Terahertz OptoelectronicsMinistry of Education Department of Physics Capital Normal University

Research on flexible strain sensors has advanced rapidly in recent years, with particular attention being devoted to two-dimensional(2D) semiconductor materials owing to their exceptional mechanical and electrical properties that are conducive to sophisticated sensing performance. However, resistive strain sensors based on 2D semiconductor materials typically exhibit positive gauge factors(GF), while materials for strain sensors with a negative GF remain elusive. We have identified a trend of reduction in the band gap of the emerging 2D semiconductor material tellurium(Te) under strain in simulations reported in past research,and have observed a negative GF in the Te-based strain sensor. In this study, we combined Te with a flexible polyethylene terephthalate(PET) substrate to manufacture a flexible strain sensor with a significantly negative GF. The results of tests revealed that the Te-based strain sensor achieved an impressive maximum sensitivity of-139.7 within a small range of bending-induced strain(< 1%). Furthermore, it exhibited excellent linearity and good cyclic stability, and was successfully applied to monitor limb movements. The work here verifies the significant potential for the use of Te-based strain sensors in next-generation flexible electronics.

关键词： 2D semiconductor materials 2D tellurium flexibleelectronics strain sensors negative gauge factor high sensitivity

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Memristive feature and mechanism induced by laser-doping in defect-free 2D semiconductor materials

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Journal of Semiconductors 2024年第7期45卷 85-91页

作者： xiaoshan du Shu Wang Qiaoxuan Zhang Shengyao Chen Fengyou Yang Zhenzhou Liu Zhengwei Fan Lijun Ma Lei Wang Lena du Zhongchang Wang Cong Wang Bing Chen Qian Liu College of Electronic and Information Engineering Shandong University of Science and TechnologyQingdao 266590China National Center for Nanoscience and Technology&University of Chinese Academy of Sciences Beijing 100190China Hebei University of Water Resources and Electric Engineering Electrical Automation Department Cangzhou 061001China The MOE Key Laboratory of Weak-Light Nonlinear Photonics and International Sino-Slovenian Join Re-search Center on Liquid Crystal Pho-tonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300457China College of Mathematics and Physics Shandong Advanced Optoelectronic Materials and Technologies Engineering LaboratoryQingdao Uni-versity of Science and TechnologyQingdao 266061China Department of Physics Capital Normal UniversityBeijing 100048China Department of Advanced Materials and Computing International Iberian Nanotechnology Laboratory(INL)4715-330 BragaPortugal College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China

Memristors as non-volatile memory devices have gained numerous attentions owing to their advantages in storage,in-memory computing, synaptic applications, etc. In recent years, two-dimensional(2D) materials with moderate defects have been discovered to exist memristive feature. However, it is very difficult to obtain moderate defect degree in 2D materials, and studied on modulation means and mechanism becomes urgent and essential. In this work, we realized memristive feature with a bipolar switching and a configurable on/off ratio in a two-terminal MoS_(2) device(on/off ratio ~100), for the first time, from absent to present using laser-modulation to few-layer defect-free MoS_(2)(about 10 layers), and its retention time in both high resistance state and low resistance state can reach 2×10^(4) s. The mechanism of the laser-induced memristive feature has been cleared by dynamic Monte Carlo simulations and first-principles calculations. Furthermore, we verified the universality of the laser-modulation by investigating other 2D materials of TMDs. Our work will open a route to modulate and optimize the performance of 2D semiconductor memristive devices.

关键词： 2D-material memristor laser doping laser direct writing memristive mechanism

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乐山市乡村民宿高质量发展路径探究

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中共乐山市委党校学报 2024年第2期26卷 86-93页

作者：杜小三中共乐山市委党校四川乐山614000

乡村民宿作为个性化的住宿产品,承载了丰富住宿产品类型、推动住宿业转型升级的重任,既是文化和旅游融合的重要载体,也是乡村振兴的助推器。乐山市的乡村旅游资源丰富、分布广泛、特色鲜明、交通便利,这为乡村民宿发展奠定了良好基础。... 详细信息

乡村民宿作为个性化的住宿产品,承载了丰富住宿产品类型、推动住宿业转型升级的重任,既是文化和旅游融合的重要载体,也是乡村振兴的助推器。乐山市的乡村旅游资源丰富、分布广泛、特色鲜明、交通便利,这为乡村民宿发展奠定了良好基础。其乡村民宿起步早却发展慢,存在规划布局滞后、质量良莠不齐、融合度偏低、服务水平不高等问题,不能更好地支撑乡村旅游的高质量发展。随着休闲旅游和大众旅游的蓬勃兴起,传统的旅游住宿产品难以满足人民群众对美好生活的多样化需求,乡村民宿亟需迭代升级。这就需要突破对传统民宿的认知,从单一的工具性向审美性、舒适性转变,发挥好传统乡土文化的情感价值和山清水秀空间的生态价值,把握好情怀与经济的平衡,掌握好城市和乡村的距离,创造性、差异化、特色化、品质化、共生化发展。

关键词：乡村旅游乡村民宿高质量发展乐山

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具有超衍射和多受体的新型纳秒激光直写研究进展(特邀)

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中国激光 2024年第12期51卷 292-308页

作者：王骏琦陈胜垚王树马立俊杜潇姗王聪齐俊杰刘前北京科技大学材料科学与工程学院北京100083 中国科学院纳米卓越中心国家纳米科学中心中国科学院大学北京100190 南开大学物理科学学院泰达应用物理研究院弱光非线性光子学教育部重点实验室天津300071 北京化工大学理学院北京100029

激光直写(LDW)是一种无掩模、高效且经济的微纳米加工手段,它广泛应用于微机电系统、光刻掩模版制作和微纳米加工等领域。随着纳米技术的迅猛发展,研究人员对LDW系统的多受体和高加工分辨率的需求日益增加。为了满足上述需求和探索新的... 详细信息

激光直写(LDW)是一种无掩模、高效且经济的微纳米加工手段,它广泛应用于微机电系统、光刻掩模版制作和微纳米加工等领域。随着纳米技术的迅猛发展,研究人员对LDW系统的多受体和高加工分辨率的需求日益增加。为了满足上述需求和探索新的微纳米加工技术,开发新型激光直写系统已成为必然。新型纳秒LDW系统是在激光与物质的非线性相互作用的原理下工作的,不仅突破了传统LDW只能使用有机光刻胶作为受体材料的限制,同时实现了超越衍射极限的加工。已经取得的进展表明了新型纳秒激光直写在多种材料刻写及纳米结构加工方面的优势和巨大发展潜力。本文将从原理、设备、技术方法与新应用等方面对新型纳秒激光直写进行评述和讨论。

关键词：激光直写超衍射加工多受体材料纳米加工

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Online preparation of high-quality BN coatings with atomic diffusion based on carbon-free water-soluble precursor

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Journal of Advanced Ceramics 2024年第3期13卷 272-281页

作者： Yiang du Bing Wang Yunbo Zhang Quzhi Song Fuwen Wang Cheng Han xiaoshan Zhang Yingde Wang Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China

Efficient and environmentally friendly production of high-quality continuous fiber coatings using current preparation methods is highly challenging due to issues such as scale and batch processing restrictions,low deposition rate,high energy consumption,and utilization of multiple environmentally hazardous *** address these challenges,we propose a stable and efficient wet chemical deposition coating method for high-throughput online continuous preparation of boron nitride(BN)coatings on ceramic fibers under an ambient *** process involves surface modification,in-situ wet chemical deposition,and heat treatment,and all seamlessly connecting with the ceramic fiber preparation process through continuous *** groups were introduced via surface modification enhancing wettability of the fiber surface with impregnating *** in-situ reaction and atom migration improve uniformity and binding of the *** a result,outstanding impregnation and adhesion properties are achieved.A comprehensive analysis to evaluate the impact of the BN coatings was conducted,which demonstrates that the BN-coated fibers exhibit a remarkable 36%increase in tensile strength,a 133%increase in fracture toughness,and enhanced temperature resistance of up to 1600℃.It provides a secure and efficient platform for cost-effective production of functional and high-quality coatings through targeted surface modification and rapid stretching impregnation.

关键词： polymer-derived ceramics SiC fibers wet chemical deposition atomic diffusion boron nitride(BN)coatings

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Reflections on the Style of Poverty Alleviation Credit

Reflections on the Style of Poverty Alleviation Credit

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作者： du xiaoshan Li Jing

＜正＞ 1. Mechanism of Poverty The poverty problem in Shangluo County in Shaanxi Provinceshows the most commonplace features in poverty-stricken areas inChina-poor natural conditions and inconvenient geographical loca-

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Predicting microbial extracellular electron transfer activity in paddy soils with soil physicochemical properties using machine learning

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Science China(Technological Sciences) 2024年第1期67卷 259-270页

作者： OU JiaJun LUO xiaoshan LIU JunYang HUANG LinYan ZHOU LiHua YUAN Yong School of Automation Guangdong University of TechnologyGuangzhou 510006China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Guangzhou Key Laboratory Environmental Catalysis and Pollution ControlSchool of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China School of Biomedical and Pharmaceutical Sciences Guangdong University of TechnologyGuangzhou 510006China

Soil extracellular electron transfer(EET)is a pivotal biological process within the realm of ***,EET suffers from a lack of predictive ***,an intricately crafted machine learning model has been developed for the purpose of predicting soil EET by using the physicochemical properties of soil as independent input variables and the EET capabilities in terms of current density(j_(max))and Coulombic charge(C_(out))as dependent output *** autoencoder ensemble stacking(AES)model was developed to address the aforementioned issue by integrating support vector machine,multilayer perceptron,extreme gradient boosting,and light gradient boosting machine algorithms as the stacking *** 10-fold crossvalidation,the AES model exhibited notable improvements in predicting j_(max)and C_(out),with average test R^(2)values of 0.83 and 0.84,respectively,surpassing those of single machine learning(ML)models and the basic ensemble *** utilizing partial correlation plots(PDPs),Shapley Additive explanations(SHAP)values,and SHAP decision plots,we quantitatively explained the impact and contribution of the input molecules on the AES model’s predictions of j_(max)and C_(out).In the context of the SHAP method for the AES model,total carbon(TC)was identified as the most correlated descriptor for j_(max),while total organic carbon(TOC)stood out as the most relevant descriptor for C_(out).In the prediction tasks of j_(max)and C_(out)within the AES model,employing a multitask ML approach allowed the model to benefit from the shared information of input variables,thereby enhancing its overall *** study provides a feasible tool for the prediction of soil EET from soil physiochemical properties and an advanced understanding of the relationship between soil physiochemical properties and EET capability.

关键词： extracellular electron transfer paddy soil machine learning prediction autoencoder ensemble stacking model

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运用财政和金融手段协调支持“三农”发展

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现代经济探讨 2008年第9期 9-12页

作者：杜晓山中国社会科学院农村发展研究所

该文阐述了财政和金融手段的各自功能,强调了两者都具有的公共服务的特性,即对公众服务的公平正义要求,以及两者所具有的无偿与有偿服务等方面的基本区别,指出两者间相互补充和支持的关系。文章着重论述了财政直接支农和发挥杠杆导向作... 详细信息

该文阐述了财政和金融手段的各自功能,强调了两者都具有的公共服务的特性,即对公众服务的公平正义要求,以及两者所具有的无偿与有偿服务等方面的基本区别,指出两者间相互补充和支持的关系。文章着重论述了财政直接支农和发挥杠杆导向作用撬动金融和其他资金支农的特性,分析了农村金融的支农效应,包括完善农村金融改革发展目标框架,以及如何促进政策金融、商业金融、合作金融、新型金融组织和农业保险、农产品期货市场等健康发展等内容。文章最后提出了财政和金融手段结合支持三农发展的几个问题。

关键词：财政手段金融手段协调支持 “三农”发展

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小额贷款公司与监管的博弈分析

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现代经济探讨 2010年第9期 44-48页

作者：杜晓山聂强中国社科院农村发展所

该文利用博弈分析,在金融办-小额贷款公司博弈框架中,提出小额贷款公司试点中监管问题出现的理论逻辑。文章分析了金融办与小额贷款公司的博弈以及均衡结果,得出注册资本金趋大化、以金融风险防范为中心以及贷款额度趋大化等结论,并用... 详细信息

该文利用博弈分析,在金融办-小额贷款公司博弈框架中,提出小额贷款公司试点中监管问题出现的理论逻辑。文章分析了金融办与小额贷款公司的博弈以及均衡结果,得出注册资本金趋大化、以金融风险防范为中心以及贷款额度趋大化等结论,并用江苏小额贷款公司试点中的监管实践进行了案例证明。同时提出实行差异化补贴政策、放宽融资比例限制、推广统一的会计核算系统以及提高风险准备金比例等政策建议,以期提高小额信贷监管的绩效。

关键词：小额贷款公司金融监管博弈分析

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Species profile and reactivity of volatile organic compounds emission in solvent uses,industry activities and from vehicular tunnels

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Journal of Environmental Sciences 2024年第1期135卷 546-559页

作者： Haimei Huang Zhangwei Wang Chunhao Dai Hai Wu Jia Guo Chunjie Wang xiaoshan Zhang State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Hunan Agricultural University Changsha 430106China National Institute of Metrology Beijing 100029China

A survey was conducted of the volatile organic compounds(VOCs)released from sources of solvent use,industry activities and vehicle emissions in Guiyang,a capital city of *** were collected by canisters and analyzed by *** species profiles of VOCs emitted from sources were *** showed that xylenes,ethylbenzene,acetone and dichloromethane were the characteristics species for painting,2-propanol and ethyl acetate for printing,α-pinene for solid wood furniture manufacturing,and 2-butanone for biscuit *** characteristics species could be as tracers for the sources *** most of samples from the solvent use,the benzene/toluene(B/T)ratio was less than 0.3,indicating that the ratio could be as the indicator for tracing the solvent use related *** results also suggested that the toluene/xylene(T/X)ratio be as the indicator to distinguish the VOCs sources of painting(2).Aromatics contributed the most to ozone formation potential(OFP)of most painting and non-paper printing sources,and oxygen-containing VOCs(OVOCs)were major species contributing to OFP of the sources from food production and paper *** OFP of the VOCs emissions from vehicle in tunnels and from other manufactures were dominated by both aromatics and ***α-pinene could explain 56.94%and 32.54%of total OFP of the VOCs sources from filing cabinet and solid wood furniture manufacturing,which was rarely been involved in previous studies of VOCs source profiles,indicating that the species of concern for VOCs sources are still insufficient at present.

关键词： Volatile organic compounds(VOCs) Species profile BTEX ratio Source reactivity

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