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Blade-Coated Porous 3D Carbon Composite Electrodes Coupled with Multiscale Interfaces for Highly Sensitive All-Paper Pressure Sensors

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Nano-Micro Letters 2024年第12期16卷 217-232页

作者： bowen zheng Ruisheng Guo Xiaoqiang Dou Yueqing Fu Bingjun Yang Xuqing Liu Feng Zhou State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Research Center of Resource Chemistry and Energy Materials State Key Laboratory of Solid LubricationLanzhou Institute of Chemical PhysicsChinese of Academy of SciencesLanzhou 730000People’s Republic of China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000People’s Republic of China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai 264006People’s Republic of China

Flexible and wearable pressure sensors hold immense promise for health monitoring,covering disease detection and postoperative *** pressure sensors with high sensitivity,wide detection range,and cost-effectiveness is *** leveraging paper for its sustainability,biocompatibility,and inherent porous structure,herein,a solution-processed all-paper resistive pressure sensor is designed with outstanding performance.A ternary composite paste,comprising a compressible 3D carbon skeleton,conductive polymer poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate),and cohesive carbon nanotubes,is blade-coated on paper and naturally dried to form the porous composite electrode with hierachical micro-and nano-structured *** with screen-printed Cu electrodes in submillimeter finger widths on rough paper,this creates a multiscale hierarchical contact interface between electrodes,significantly enhancing sensitivity(1014 kPa-1)and expanding the detection range(up to 300 kPa)of as-resulted all-paper pressure sensor with low detection limit and power *** versatility ranges from subtle wrist pulses,robust finger taps,to large-area spatial force detection,highlighting its intricate submillimetermicrometer-nanometer hierarchical interface and nanometer porosity in the composite ***,this all-paper resistive pressure sensor,with its superior sensing capabilities,large-scale fabrication potential,and cost-effectiveness,paves the way for next-generation wearable electronics,ushering in an era of advanced,sustainable technological solutions.

关键词： Micro-and nano-structures PEDOT:PSS Flexible pressure sensors Health monitoring Multiscale interfaces

Damage evolution of rock-encased-backfill structure under stepwise cyclic triaxial loading

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 597-615页

作者： Xin Yu Yuye Tan Weidong Song John Kemeny Shengwen Qi bowen zheng Songfeng Guo Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100089China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing100089China University of Chinese Academy of Sciences Beijing100049China School of Civil and Resources Engineering University of Science and Technology BeijingBeijing100083China Key Laboratory of High-Efficient Mining and Safety of Metal Mines(Ministry of Education of China) University of Science and Technology BeijingBeijing100083China Department of Mining and Geological Engineering University of ArizonaTucsonAZ86721USA

Rock-encased-backfill(RB)structures are common in underground mining,for example in the cut-andfill and stoping *** understand the effects of cyclic excavation and blasting activities on the damage of these RB structures,a series of triaxial stepwise-increasing-amplitude cyclic loading experiments was conducted with cylindrical RB specimens(rock on outside,backfill on inside)with different volume fractions of rock(VF=0.48,0.61,0.73,and 0.84),confining pressures(0,6,9,and 12 MPa),and cyclic loading rates(200,300,400,and 500 N/s).The damage evolution and meso-crack formation during the cyclic tests were analyzed with results from stress-strain hysteresis loops,acoustic emission events,and post-failure X-ray 3D fracture *** results showed significant differences between cyclic and monotonic loadings of RB specimens,particularly with regard to the generation of shear microcracks,the development of stress memory and strain hardening,and the contact forces and associated friction that develops along the rock-backfill *** important finding is that as a function of the number of cycles,the elastic strain increases linearly and the dissipated energy increases ***,compared with monotonic loading,the cyclic strain hardening characteristics are more sensitive to rising confining pressures during the initial compaction *** finding is that compared with monotonic loading,more shear microcracks are generated during every reloading stage,but these microcracks tend to be dispersed and lessen the likelihood of large shear fracture *** transition from elastic to plastic behavior varies depending on the parameters of each test(confinement,volume fraction,and cyclic rate),and an interesting finding was that the transformation to plastic behavior is significantly lower under the conditions of 0.73 rock volume fraction,400 N/s cyclic loading rate,and 9 MPa *** the findings have important practical implications on t

关键词： Rock and backfill Triaxial cyclic loading Volume fraction Damage evolution 3D visualization

Shear mechanical properties and fracturing responses of layered rough jointed rock-like materials

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International Journal of Minerals,Metallurgy and Materials 2024年第11期31卷 2417-2434页

作者： Xinxin Nie Qian Yin Manchao He Qi Wang Hongwen Jing bowen zheng Bo Meng Tianci Deng zheng Jiang Jiangyu Wu State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Department of Materials University of OxfordOxford OX13PHUK

This study aims to investigate mechanical properties and failure mechanisms of layered rock with rough joint surfaces under direct shear *** layered samples with dimensions of 100 mm×100 mm×100 mm were casted using rock-like materials,with anisotropic angle(α)and joint roughness coefficient(JRC)ranging from 15°to 75°and 2-20,*** direct shear tests were conducted under the application of initial normal stress(σ_(n)) ranging from 1-4 *** test results indicate significant differences in mechanical properties,acoustic emission(AE)responses,maximum principal strain fields,and ultimate failure modes of layered samples under different test *** peak stress increases with the increasingαand achieves a maximum value atα=60°or 75°.As σ_(n) increases,the peak stress shows an increasing trend,with correlation coefficients R² ranging from 0.918 to 0.995 for the linear least squares *** JRC increases from 2-4 to 18-20,the cohesion increases by 86.32%whenα=15°,while the cohesion decreases by 27.93%whenα=75°.The differences in roughness characteristics of shear failure surface induced byαresult in anisotropic post-peak AE responses,which is characterized by active AE signals whenαis small and quiet AE signals for a largeα.For a given JRC=6-8 andσ_(n)=1 MPa,asαincreases,the accumulative AE counts increase by 224.31%(αincreased from 15°to 60°),and then decrease by 14.68%(αincreased from 60°to 75°).The shear failure surface is formed along the weak interlayer whenα=15°and penetrates the layered matrix whenα=60°.Whenα=15°,as σ_(n) increases,the adjacent weak interlayer induces a change in the direction of tensile cracks propagation,resulting in a stepped pattern of cracks *** increase in JRC intensifies roughness characteristics of shear failure surface for a smallα,however,it is not pronounced for a largeα.The findings will contribute to a better understanding of the mechanical responses and failure mechanisms of the layered roc

关键词： layered samples anisotropic angle joint roughness coefficient mechanical properties acoustic emission response fracturing evolution failure modes

In-situ Horizontal Extrusion Test of Herbaceous Root-Soil with Different Root Types

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Journal of Earth Science 2024年第3期35卷 918-928页

作者： Fangcui Liu Shengwen Qi Shenglin Qi Xiaokun Hou Yanrong Li Guangming Luo Lei Xue Xueliang Wang Juanjuan Sun Songfeng Guo bowen zheng Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Innovation Academy for Earth Sciences Chinese Academy of SciencesBeijing 100029China China-Pakistan Joint Research Center on Earth Sciences CAS-HECIslamabad 45320Pakistan Government Affairs Service Center of Beijing Municipal Water Affairs Bureau Beijing 100073China Department of Earth Sciences and Engineering Taiyuan University of TechnologyTaiyuan 030024China

The influence of different types of roots on the soil is complex and still remains *** in-situ extrusion tests were conducted on two types of root systems,namely fibrous and tap root system,for three plants,Eleusine indica,Potentilla anserine,and Artemisia argyi,according to the classification in Botany,and the thrust-displacement curves and failure patterns of different samples were analysed by comparison to fill the aforementioned *** reveal that the roots can reduce the characteristics of soil brittleness and enhance its capability to resist large deformation,and different root types contribute different effects to the strain-hardening behavior of the root-soil *** contribution of the fibrous root system to strength is limited,whilst the tap root system substantially enhances strength and *** of failure patterns show that fibrous and tap root systems affect soil solidification and surface cracking ***,the effect of the tap root system depends on the composition of lateral and tap roots:long and rich lateral roots are effective for resisting the creation of cracks,but thick tap roots with few and thin lateral roots may lead to several surface cracks.

关键词： root types fibrous root tap root in-situ horizontal extrusion test root-soil cracks slope protection.

A statistical sensing method by utilizing Wi-Fi CSI subcarriers:Empirical study and performance enhancement

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Journal of Information and Intelligence 2024年第4期2卷 365-374页

作者： Tao Deng bowen zheng Rui Du Fan Liu Tony Xiao Han Wireless Technology Laboratory Huawei Techologies Co.Ltd.Shenzhen 518000China School of System Design and Intelligent Manufacturing(SDIM) Southern University of Science and TechnologyShenzhen 518000China

In modern Wi-Fi systems,channel state information(CSI)serves as a foundational support for various sensing ***,existing CSI-based techniques exhibit limitations in terms of environmental *** such,optimizing the utilization of subcarrier CSI stands as a critical avenue for enhancing sensing *** the OFDM communication framework,this work derives sensing outcomes for both detection and estimation by harnessing the CSI from every individual measured subcarrier,subsequently consolidating these *** contrasted against results derived from CSI based on specific extraction protocols or those obtained through weighted summation,the methodology introduced in this study offers substantial improvements in CSI-based detection and estimation *** approach not only underscores the significance but also serves as a robust exemplar for the comprehensive application of CSI.

关键词： CSI Subcarrier Wi-Fi sensing

Analysis of ancient Rongcharong landslide dam failure events in the Suwalong reach of the upper reaches of the Jinsha River

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Journal of Earth Science 2024年

作者： Yongchao Li Songfeng Guo bowen zheng Yu Zou Shengyuan Song Yiwei Zhang Jianhua Yan Muhammad Faisal Waqar Khan Zada Shengwen Qi Jianping Chen Institute of Geology and Geophysics， Chinese Academy of Sciences Innovation Academy for Earth Science， Chinese Academy of Sciences College of Construction Engineering， Jilin University College of Earth and Planetary Science， University of Chinese Academy of Sciences School of City and Architecture Engineering， Zaozhuang University School of Earth Sciences and Engineering， Hohai University Geo-technical and Geo-Environmental Engineering Division， National Engineering Service Pakistan

Active tectonic movements and geological disasters frequently occur in the upper reaches of the Jinsha River， increasing the likelihood of landslides obstructing the river. Taking the ancient Rongcharong landslide dam failure events in the Suwalong reach as an example， this paper first analyzes the accuracy and applicability of the commonly used methods in calculating the peak flow of the dam failure， such as the empirical formula， the numerical method based on the physical mechanism， and the computational fluid dynamics (CFD) method. Then， the peak flood flow of the Rongcharong-dammed lake when it overflows the dam is determined to be 28393～64272m3/s. At the same time， the failure process of landslide dam due to flood erosion was elucidated using the CFD method， which can be divided into three stages: gradual erosion in the initial stage， rapid development in the middle stage， and gradual expansion in the final stage. Finally， the factors that affect the peak flow of floods are analyzed， and suggestions for emergency treatment of landslide dams are put forward. The findings of this research can serve as a valuable reference for disaster prevention and mitigation strategies to adapt to the increasing frequency of landslide-induced river blockages.

关键词：

Influence of High-Pressure Induced Lattice Dislocations and Distortions on Thermoelectric Performance of Pristine SnTe

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Chinese Physics Letters 2024年第5期41卷 61-68页

作者：郑博文陈涛孙海瑞杨曼曼杨兵超陈欣张永胜刘晓兵 Laboratory of High-Pressure Physics and Materials Science School of Physics and Physical EngineeringQufu Normal UniversityQufu 273165China Advanced Research Institute of Multidisciplinary Sciences Qufu Normal UniversityQufu 273165China Key Lab of Photovoltaic and Energy Conservation Materials Institute of Solid State Physics HFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China School of Electronic Engineering Huainan Normal University Huainan 232038China

As a sister compound of PbTe, SnTe possesses the environmentally friendly elements. However, the pristine SnTe compounds suffer from the high carrier concentration, the large valence band offset between the L and Σpositions and high thermal conductivity. Using high-pressure and high-temperature technology, we synthesized the pristine SnTe samples at different pressures and systemically investigated their thermoelectric *** pressure induces rich microstructures, including the high-density dislocations and lattice distortions, which serve as the strong phonon scattering centers, thereby reducing the lattice thermal conductivity. For the electrical properties, pressure reduces the harmful high carrier concentration, due to the depression of Sn ***, pressure induces the valence band convergence, reducing the energy separation between the L and Σpositions. The band convergence and suppressed carrier concentration increase the Seebeck coefficient. Thus, the power factors of pressure-sintered compounds do not deteriorate significantly under the condition of decreasing electrical conductivity. Ultimately, for a pristine SnTe compound synthesized at 5 GPa, a higher ZT value of 0.51 is achieved at 750 K, representing a 140% improvement compared to the value of 0.21 obtained using SPS. Therefore, the high-pressure and high-temperature technology is demonstrated as an effectively approach to optimize thermoelectric performance.

关键词： coefficient properties positions

实质平等保护视角下民营企业内部人员背信犯罪的司法认定——以《刑法修正案(十二)》相关条文展开

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法治研究 2024年第4期154卷 98-109页

作者：胡东飞郑博文西南财经大学法学院

《刑法修正案(十二)》将民营企业内部人员纳入《刑法》第165条、第166条、第169条规制范围,进一步加强了民营企业产权平等保护。对于民营企业产权保护,应在形式平等之下,关注不同所有制企业内部人员实施背信犯罪的本质区别,实行差异化... 详细信息

《刑法修正案(十二)》将民营企业内部人员纳入《刑法》第165条、第166条、第169条规制范围,进一步加强了民营企业产权平等保护。对于民营企业产权保护,应在形式平等之下,关注不同所有制企业内部人员实施背信犯罪的本质区别,实行差异化保护。民营企业内部人员背信犯罪的司法认定,应在与国有企业内部人员背信犯罪区分的基础之上,结合《公司法》相关规定与理论进行。具体而言,事实董事能够被解释为“董事”;控股股东或实际控制人实施相关背信犯罪的认定则需视具体情形而定;一人公司、个人独资企业、合伙企业亦能被“其他公司、企业”所涵摄。对于行为的结果,应对是否造成“重大损失”进行实质判断,避免以义务违反替代财产损失;至于“违反法律、行政法规”的认定则属于违法性判断问题,相关背信行为取得股东会或董事会同意的,原则上不构成相应背信犯罪,但特殊情况下(表决权滥用等)也可能构成犯罪。

关键词：刑法修正案(十二) 民营企业背信犯罪实质平等司法认定

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箱形截面钢-混凝土组合连梁的抗震性能

建筑结构 2024年第1期54卷 9-16,8页

作者：郑博文张文元哈尔滨工业大学结构工程灾变与控制教育部重点实验室哈尔滨150090 哈尔滨工业大学土木工程智能防灾减灾工业和信息化部重点实验室哈尔滨150090

对一种箱形截面钢-混凝土组合连梁展开研究,通过有限元模拟和理论分析对其屈服模式、抗震性能进行了深入探索。对不同参数取值下组合连梁的屈服模式进行对比分析,基于组合连梁长度与屈服承载力的关系,给出屈服模式的判定准则,研究了不... 详细信息

对一种箱形截面钢-混凝土组合连梁展开研究,通过有限元模拟和理论分析对其屈服模式、抗震性能进行了深入探索。对不同参数取值下组合连梁的屈服模式进行对比分析,基于组合连梁长度与屈服承载力的关系,给出屈服模式的判定准则,研究了不同参数对组合连梁屈服模式的影响规律。结果表明:减小截面高度、钢腹板高厚比、钢材屈服强度、混凝土强度,增大剪跨比、钢翼缘宽厚比、截面高宽比等措施均使耗能梁段更容易弯曲屈服。轴向受压时,弯曲屈服型构件的延性普遍优于剪切屈服型构件;轴向受拉时,剪切屈服型构件的延性优于弯曲屈服型构件。剪切屈服型构件的弹性段刚度、屈服荷载、极限荷载以及能量耗散系数普遍大于弯曲屈服型构件。

关键词：箱形截面钢-混凝土组合连梁屈服模式抗震性能参数分析