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Flexible pressure sensors with ultrahigh stress tolerance enabled by periodic microslits

Microsystems & Nanoengineering 2024年第1期10卷 301-311页

作者： Song wang Chenying wang Yifan Zhao Yujing Zhang Yaxin Zhang Xiangyue Xu Qijing Lin Kai Yao yuheng wang Feng Han Yu Sun Zhuangde Jiang State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’anChina State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesSchool of Instrument Science and TechnologyXi’an Jiaotong UniversityXi’anChina The Faculty of Electrical Engineering and Computer Science Ningbo UniversityNingboChina Department of Mechanical and Industrial Engineering University of TorontoTorontoCanada

Stress tolerance plays a vital role in ensuring the effectiveness of piezoresistive sensing films used in flexible pressure sensors.However,existing methods for enhancing stress tolerance employ dome-shaped,wrinkle-shaped,and pyramidal-shaped microstructures in intricate molding and demolding processes,which introduce significant fabrication challenges and limit the sensing performance.To address these shortcomings,this paper presents periodic microslits in a sensing film made of multiwalled carbon nanotubes and polydimethylsiloxane to realize ultrahigh stress tolerance with a theoretical maximum of 2.477 MPa and a sensitivity of 18.092 kPa−1.The periodic microslits permit extensive deformation under high pressure(e.g.,400 kPa)to widen the detection range.Moreover,the periodic microslits also enhance the sensitivity based on simultaneously exhibiting multiple synapses within the sensing interface and between the periodic sensing cells.The proposed solution is verified by experiments using sensors based on the microslit strategy for wind direction detection,robot movement sensing,and human health monitoring.In these experiments,vehicle load detection is achieved for ultrahigh pressure sensing under an ultrahigh pressure of over 400 kPa and a ratio of the contact area to the total area of 32.74%.The results indicate that the proposed microslit strategy can achieve ultrahigh stress tolerance while simplifying the fabrication complexity of preparing microstructure sensing films.

关键词： robot shaped stress

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Microbial-driven ectopic uranium extraction with net electrical energy production

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Frontiers of Environmental Science & Engineering 2024年第1期18卷 49-58页

作者： Xin Tang Yin Ye Chunlin wang Bingqian wang Zemin Qin Cui Li Yanlong Chen yuheng wang Zhiling Li Miao Lv Aijie wang Fan Chen School of Ecology and Environment Northwestern Polytechnical UniversityXi’an 710129China School of Materials Science and Engineering Xi’an University of Architecture and TechnologyXi’an 710055China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China

The extraction of uranium (U) from U-bearing wastewater is of paramount importance for mitigating negative environmental impacts and recovering U resources. Microbial reduction of soluble hexavalent uranium (U(VI)) to insoluble tetravalent uranium (U(IV)) holds immense potential for this purpose, but its practical application has been impeded by the challenges associated with managing U-bacterial mixtures and the biotoxicity of U. To address these challenges, we present a novel spontaneous microbial electrochemical (SMEC) method that spatially decoupled the microbial oxidation reaction and the U(VI) reduction reaction. Our results demonstrated stable and efficient U extraction with net electrical energy production, which was achieved with both synthetic and real wastewater. U(VI) removal occurred via diffusion-controlled U(VI)-to-U(IV) reduction-precipitation at the cathode, and the UIVO_(2) deposited on the surface of the cathode contributed to the stability and durability of the abiotic U(VI) reduction. Metagenomic sequencing revealed the formation of efficient electroactive communities on the anodic biofilm and enrichment of the key functional genes and metabolic pathways involved in electron transfer, energy metabolism, the TCA cycle, and acetate metabolism, which indicated the ectopic reduction of U(VI) at the cathode. Our study represents a significant advancement in the cost-effective recovery of U from U(VI)-bearing wastewater and may open a new avenue for sustainable uranium extraction.

关键词： U(VI)bioreduction Electricity production Reaction decoupling Uranium-bearing wastewater Biofilm microbiome

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In situ reconstruction induced oxygen-deficient multiphase Cu based species hybridized with Ni single atoms as tandem platform for CO_(2) electroreduction

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Nano Research 2024年第5期17卷 3888-3894页

作者： Juzhe Liu yuheng wang Pengpeng Mo Feng Yang Kaiqi Jiang Zhixiang Cheng Yuxuan Liu Zhiyi Sun Zheng Liu Yimei Zhang Wenxing Chen The Key Laboratory of Resources and Environmental System Optimization Ministry of EducationCollege of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China Energy&Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China SEPA Key Laboratory of Eco-Industry Chinese Research Academy of Environmental SciencesBeijing 100012China

Tandem catalysis,capable of decoupling individual steps,provides a feasible way to build a high-efficiency CO_(2) electro-conversion system for multicarbons(C_(2+)).The construction of electrocatalytic materials is one of focusing issues.Herein,we fabricated a single atom involved multivalent oxide-derived Cu composite material and found it inclined to reconstruct into oxygen-deficient multiphase Cu based species hybridized with monatomic Ni on N doped C matrix.In this prototype,rapid CO generation and C-C coupling are successively achieved on NiN4 sites and surface amorphized Cu species with defects,resembling a micro-production line.In this way,the in situ formed tandem catalyst exhibited a high Faradaic efficiency(FE)of~78%for C_(2+)products along with satisfactory durability over 50 h.Particularly,the reconstruction-induced amorphous layer with abundant asymmetric sites should be favorable to improve the ethanol selectivity(FE:63%),which is about 10 times higher than that of the non-tandem Cu-based contrast material.This work offers a new approach for manipulating tandem catalyst systems towards enhancing C_(2+)products.

关键词： tandem catalysis single atom reconstruction amorphous CO_(2)reduction reaction

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Comparison of internal force antagonism between redundant cable-driven parallel robots and redundant rigid parallel robots

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Frontiers of Mechanical Engineering 2023年第4期18卷 97-117页

作者： yuheng wang Xiaoqiang TANG State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipment and Control Tsinghua UniversityBeijing 100084China

The internal force antagonism(IFA)problem is one of the most important issues limiting the applications and popularization of redundant parallel robots in industry.Redundant cable-driven parallel robots(RCDPRs)and redundant rigid parallel robots(RRPRs)behave very differently in this problem.To clarify the essence of IFA,this study first analyzes the causes and influencing factors of IFA.Next,an evaluation index for IFA is proposed,and its calculating algorithm is developed.Then,three graphical analysis methods based on this index are proposed.Finally,the performance of RCDPRs and RRPRs in IFA under three configurations are analyzed.Results show that RRPRs produce IFA in nearly all the areas of the workspace,whereas RCDPRs produce IFA in only some areas of the workspace,and the IFA in RCDPRs is milder than that RRPRs.Thus,RCDPRs more fault-tolerant and easier to control and thus more conducive for industrial application and popularization than RRPRs.Furthermore,the proposed analysis methods can be used for the configuration optimization design of RCDPRs.

关键词： cable-driven parallel robots parallel robots redundant robots evaluation index force solution space

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Rhizobacteria helps to explain the enhanced efficiency of phytoextraction strengthened by Streptomyces pactum

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Journal of Environmental Sciences 2023年第3期125卷 73-81页

作者： Linlin wang Ninawang Di Guo Zhengzheng Shang Yiying Zhang Song Liu yuheng wang School of Ecology and Environment Northwestern Polytechnical UniversityXi’an 710129China Xi’an Aisen Environmental Information Technology Service Co. LtdXi’an 710119China Department of Microbiology and Immunology University of Western OntarioLondonON N6A 5C1Canada State Key Laboratory of Crop Stress Biology for Arid Areas and College of Agronomy Northwest A&F UniversityYangling 712100China

The ultimate purpose of phytoextraction is not only to remove heavy metals from soil but also to improve soil quality.Here, we evaluated how the joint effect of Streptomyces pactum(strain Act12) and inorganic(Hoagland’s solution) and organic(humic acid and peat) nutrients affected the phytoextraction practice of cadmium(Cd) and zinc(Zn) by potherb mustard, and the microbial community composition within rhizosphere was also investigated.The results indicated that the nutrients exerted synergistically with Act12, all increasing the plant biomass and Cd/Zn uptakes.The inoculation of Act12 alone significantly increased dehydrogenase activity of rhizosphere soil(PAct12>Humic acid >Hoagland’s solution.Comparatively, Sphingomonas replaced Thiobacillus as dominant genus after Act12 application.The increase in the Sphingomonas and Flavisolibacter abundances under Act12 and nutrients treatments gave rise to growth-promoting effect on plant.Our results revealed the important role for rhizosphere microbiota in mediating soil biochemical traits and plant growth, and our approach charted a path toward the development of Act12 combined with soil nutrients to enhance soil quality and phytoextraction efficiency in Cd/Zn-contaminated soils.

关键词： Phytoextraction Streptomyces pactum Enzymatic activity Microbial community

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MAG molten pool edge detection algorithm based on a fusion of dark channel prior dehazing and image enhancement

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Optoelectronics Letters 2024年

作者： Liu Weipeng Qu Zepeng Gong Xiangrui wang yuheng Zhou Zhengkui School of Electrical Engineering Hebei University of Technology School of Artificial Intelligence and Data Science Hebei University of Technology

Metal Active Gas welding is one of the widely applied welding techniques using argon and carbon dioxide as shielding gas. In response to the problem of welding halo and drag shadow during the image acquisition process of it， which makes it difficult to accurately extract the contour of the molten pool， this paper proposes a molten pool edge detection method that combines dark channel prior dehazing and improved single scale Retinex image enhancement algorithm. This method overcomes the problem of excessive edge noise in the original molten pool image and the difficulty in feature extraction caused by the dark part of the molten pool after dark channel prior dehazing processing. Through comparative experiments and ablation experiments， it has been shown that the algorithm proposed in this paper has significantly improved the enhancement effect and feature extraction effect， extracting accurate and complete molten pool contours.

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Boosting the high-rate performance and cycling life of NaTi_(2)(PO_(4))_(3) anode by forming N-doped carbon coating derived from polyacrylonitrile

ChemPhysMater

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ChemPhysMater 2023年第4期2卷 315-322页

作者： Huan Yang Zhongnian Yang Yujun Bai Wenjing Du yuheng wang Jiru Xian Department of Chemical Engineering and Safety Binzhou UniversityBinzhou 256603China Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials of Ministry of Education State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250061China Henan Key Laboratory of Electronic Ceramic Materials and Application Henan Engineering Laboratory of Functional Inorganic Nonmetallic MaterialsCollege of Materials EngineeringHenan University of EngineeringZhengzhou 451191China

Poor electron conductivity is the key issue influencing the rate capability of NaTi_(2)(PO_(4))_(3)(NTP).Hence,herein,polyacrylonitrile(PAN)was utilized as a NTP modifier by simply mixing NTP in a liquid PAN suspension,followed by sintering at 850℃ for 5 h.The product with a PAN/NTP mass ratio of 0.3 delivered splendid rate capabilities(achieving lithiation capacities of 282.9,243.0,207.1,173.1,133.5,and 257.5 mAh g^(−1) at 0.1,0.2,0.4,0.8,1.6,and 0.1 A^(−1),respectively)and excellent long cycling life(capacity retention of 165.5 mAh g^(−1) after 1200 cycles at 0.5 A g−1).Based on detailed structural and compositional characterizations,as well as cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS),the uniform N-doped carbon coating stemming from PAN carbonization around the NTP particles promoted electron transfer,while the oxygen vacancies induced by N-doping in NTP facilitated Li+diffusion.The boosted and well matched electronic and ionic conductivities give rise to the optimized electrochemical performance.

关键词： NaTi_(2)(PO_(4))_(3) Carbon coating N-doping Polyacrylonitrile Lithium storage performance

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Inverse design of highly efficient and broadband mode splitter on SOI platform

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Chinese Optics Letters 2024年第1期22卷 59-64页

作者：廖俊鹏田野杨子荣徐豪达唐晨王钰恒张晓伟康哲 Department of Electrical Engineering and Computer Science Ningbo UniversityNingbo 315211China Centre for Optical and Electromagnetic Research College of Optical Science and EngineeringZhejiang UniversityHangzhou 310058China

Mode splitters that directly separate modes without changing their orders are highly promising to improve the flexibility of the mode-division multiplexing systems.In this paper,we design a high-performance mode splitter on the silicon-oninsulator platform with a compact footprint of 14μm×2.5μm using an inverse design method based on shape optimization.The fabrication of this mode splitter requires only a single lithography step and exhibits good fabrication tolerances.The experimental results show that the proposed device exhibits state-of-the-art insertion loss(<0.9 dB)and cross talk(<-16 dB)over a broad bandwidth(1500-1600 nm).Furthermore,the shape optimization method used is implemented to design a dual-mode(de)multiplexer,and the experimental results fulfill the design objective,demonstrating the excellent generality of the design method in this paper.

关键词： integrated optics inverse design mode splitter

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Estimating the Budgets of Nutrients for Phytoplankton Bloom inthe Central Yellow Sea Using a Modified LowerTropic Ecosystem Model

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Journal of Ocean University of China 2014年第1期13卷 1-12页

作者： Chengyi Yuan yuheng wang Hao Wei College of Physical and Environmental Oceanography Ocean University of China Qingdao P. R. China College of Marine Science and Engineering Tianjin University of Science and Technology Tianjin P. R. China

A modified lower trophic ecosystem model （NEMURO） is coupled with a three-dimensional hydrodynamic model for anapplication in the central Yellow Sea. The model is used to simulate the horizontal distributions and annual cycles of chlorophyll-aand nutrients with results consistent with historical observations. Generally, during the winter background and spring bloom periods,the exchange with neighboring waters constitutes the primary sources of nutrients. Howerver, during the winter background period,the input of silicate from the layer deeper than 50 m is the most important source that contributes up to 60% to the total sources. Dur-ing the spring bloom period, the transport across the thermocline makes significant contribution to the input of phosphate and silicate.During the post spring bloom period, the relative contribution of relevant processes varies for different nutrients. For ammonium,atmospheric deposition, excretion of zooplankton and decomposition of particulate and dissolved nitrogen make similar contributionsFor phosphate and silicate, the dominant input is the transport across the thermocline, accounting for 62% and 68% of the totalsources, respectively. The N/P ratio averaged annually and over the whole southern Yellow Sea is up to 51.8, indicating the potentialof P limitation in this region. The important influence of large scale sea water circulation is revealed by both the estimated fluxes andthe corresponding N/P ratio of nutrients across a section linking the northeastern bank of the Changjiang River and Cheju Island.During the winter background period, the input of nitrate, ammonium, phosphate and silicate by the Yellow Sea Warm Current isestimated to be 4.6~ 101~, 2.3x 101~, 2.0x 109 and 1.2x 101~ mol, respectively.

关键词： budgets of nutrients spring bloom central Yellow Sea NEMURO

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2种水运仪象台枢轮复原方案的受力分析

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清华大学学报（自然科学版） 2024年第3期64卷 545-551页

作者：徐思源王禹衡唐晓强王哲然清华大学科学史系北京100084 清华大学机械工程系北京100084

枢轮是水运仪象台复原研究中的难点,根据受水壶是否可以独立于枢轮转动,形成了“翻斗”与“定斗”2种复原方案。一方面,2种方案都会不可避免地出现与原文违背之处。因此,与原文是否符合已不适合作为评价复原方案优劣的唯一标准,而新的... 详细信息

枢轮是水运仪象台复原研究中的难点,根据受水壶是否可以独立于枢轮转动,形成了“翻斗”与“定斗”2种复原方案。一方面,2种方案都会不可避免地出现与原文违背之处。因此,与原文是否符合已不适合作为评价复原方案优劣的唯一标准,而新的复原模型也不能只是简单地遵从其中某一种方案进行制作。另一方面,对博物馆展览而言,模型能否长期稳定运行,是选择方案时的重要考量因素。因此,该文通过建模和计算,得到了2种方案中各部件的受力数据。结果表明:“定斗”方案中的枢轮和左天锁等关键部件承受的冲击小于“翻斗”方案。新的复原模型可以在吸纳定斗方案这一优点的基础上进行制作。

关键词：水运仪象台枢轮复原受力分析

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