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Self-cleaning SERS sensor based on flexible Ni_(3)S_(2)/MoS_(2)@Ag@PDMS composites for label-free multiplex volatile organic compounds detection

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Nano Research 2024年第6期17卷 5529-5539页

作者： Xinyue Song Yongzheng Zhang xiaohui ren Dongyan Tang Xuelin Zhang Xin Li MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringState Key Lab of Urban Water Resource and EnvironmentHarbin Institute of TechnologyHarbin 150090China College of Textile and Clothing Yancheng Institute of TechnologyYancheng 224051China MEMS Center Harbin Institute of TechnologyHarbin 150001China

Flexible self-cleaning surface-enhanced Raman scattering(SERS)sensors are highly desirable for the detection of various environmental pollutants,including volatile organic compounds(VOCs).However,achieving sensitive detection without labeling and ensuring efficient cyclic use remain significant ***,we introduce a direct approach to create a versatile Ni_(3)S_(2)/MoS_(2)@Ag@PDMS(PDMS=polydimethylsiloxane)composite SERS substrate using chemical vapor deposition *** produced substrate shows outstanding performance,offering extremely low detection sensitivity(1.0×10^(−12)M 4-aminobenzenethiol)and high enhancement factors(approximately 107).The interactions between the rod-shaped Ni_(3)S_(2)/MoS_(2)@Ag heterostructure and the molecules facilitate the transfer of charge,resulting in an increased electric field enhancement of the exciton *** has the dual benefit of providing a self-cleaning effect and enhancing SERS ***,the substrate enables sensitive detection of VOCs gas molecules without the need for labels,achieving a minimum detectable concentration as low as 1 ppm for o-dichlorobenzene,due to the preconcentration effect of *** calculations further explain the combined effect of electromagnetic and chemical enhancement in this composite *** utilizing the developed visual SERS barcode,quick multiple detection and analysis of mixtures can be *** flexible and versatile SERS technique has significant potential for on-site detection and analysis of environmental pollutants,opening the doors for the development of a wearable in-situ SERS sensing platform.

关键词： surface-enhanced Raman scattering(SERS) quantitative detection recyclable detection volatile organic compounds(VOCs) chemical vapor deposition(CVD)

Greenhouse gas emissions from Daihai Lake,China:Should eutrophication and salinity promote carbon emission dynamics?

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Journal of Environmental Sciences 2024年第1期135卷 407-423页

作者： Xiangwei Li Ruihong Yu Jun Wang Heyang Sun Xinyu Liu xiaohui ren Shuai Zhuang Zhiwei Guo Xixi Lu Inner Mongolia Key Laboratory of River and Lake Ecology School of Ecology and EnvironmentInner Mongolia UniversityHohhot 010070China Key Laboratory of Mongolian Plateau Ecology and Resource Utilization Ministry of EducationHohhot 010070China Autonomous Region Collaborative Innovation Center for Integrated Management of Water Resources and Water Environment in the Inner Mongolia Reaches of the Yellow River Hohhot 010018China Department of Geography National University of Singapore117570Singapore

Greenhouse gases(GHGs)emitted or absorbed by lakes are an important component of the global carbon ***,few studies have focused on the GHG dynamics of eutrophic saline lakes,thus preventing a comprehensive understanding of the carbon ***,we conducted four sampling analyses using a floating chamber in Daihai Lake,a eutrophication saline lake in Inner Mongolia Autonomous Region,China,to explore its carbon dioxide(CO_(2))and methane(CH_(4))*** mean CO_(2)emission flux(FCO_(2))and CH_(4)emission flux(FCH_(4))were 17.54±14.54 mmol/m^(2)/day and 0.50±0.50 mmol/m^(2)/day,*** results indicated that Daihai Lake was a source of CO_(2)and CH_(4),and GHG emissions exhibited temporal *** mean CO_(2)partial pressure(p CO_(2))and CH_(4)partial pressure(p CH_(4))were 561.35±109.59μatm and 17.02±13.45μatm,which were supersaturated relative to the *** regression and correlation analysis showed that the main influencing factors of p CO_(2)were wind speed,dissolved oxygen(DO),total nitrogen(TN)and Chlorophyll a(Chl.a),whereas the main influencing factors of p CH_(4)were water temperature(WT),Chl.a,nitrate nitrogen(NO_(3)^(-)-N),TN,dissolved organic carbon(DOC)and water *** regulated carbon mineralization and organic matter decomposition,and it was an important influencing factor of p CO_(2)and p CH_(4).Additionally,the trophic level index(TLI)significantly increased p CH_(4).Our study elucidated that salinity and eutrophication play an important role in the dynamic changes of GHG ***,research on eutrophic saline lakes needs to be strengthened.

关键词： Eutrophication Salinity Greenhouse gas emissions Inland lake Inner Mongolia Autonomous Region

Glioma-derived ANXA1 suppresses the immune response to TLR3 ligands by promoting an anti-inflammatory tumor microenvironment

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Cellular & Molecular Immunology 2024年第1期21卷 47-59页

作者： Yu Zheng Haihui Jiang Naixue Yang Shaoping Shen Daosheng Huang Lemei Jia Jing Ling Longchen Xu Mingxiao Li Kefu Yu xiaohui ren Yong Cui Xun Lan Song Lin Xin Lin Institute for Immunology and School of Medicine Tsinghua UniversityBeijing100084China Department of Neurosurgery Beijing Tiantan HospitalCapital Medical UniversityChina.National Clinical Research Center for Neurological DiseasesCenter of Brain TumorBeijing Institute for Brain Disorders and Beijing Key Laboratory of Brain TumorBeijing100070China Department of Neurosurgery Peking University Third HospitalPeking UniversityBeijing100191China Tsinghua-Peking Center for Life Sciences Beijing100084China

A highly immunosuppressive tumor microenvironment(TME)and the presence of the blood‒brain barrier are the two major obstacles to eliciting an effective immune response in patients with high-grade glioma(HGG).Here,we tried to enhance the local innate immune response in relapsed HGG by intracranially injecting poly(I:C)to establish a robust antitumor immune response in this registered clinical trial(NCT03392545).During the follow-up,12/27(44.4%)patients who achieved tumor control concomitant with survival benefit were regarded as responders in our *** found that the T-cell receptor(TCR)repertoire in the TME was reshaped after poly(I:C)*** on the RNA-seq analysis of tumor samples,the expression of annexin A1(ANXA1)was significantly upregulated in the tumor cells of nonresponders,which was further validated at the protein *** vitro and in vivo experiments showed that ANXA1 could induce the production of M2-like macrophages and microglia via its surface receptor formyl peptide receptor 1(FPR1)to establish a Treg cell-driven immunosuppressive TME and suppress the antitumor immune response facilitated by poly(I:C).The ANXA1/FPR1 signaling axis can inhibit the innate immune response of glioma patients by promoting an anti-inflammatory and Treg-driven ***,ANXA1 could serve as a reliable predictor of response to poly(I:C),with a notable predictive accuracy rate of 92.3%.In light of these notable findings,this study unveils a new perspective of immunotherapy for gliomas.

关键词： glioma ANXA1 TLR3 poly(I:C) immunotherapy

压电智能功能梯度夹芯结构高精度理论模型与主动控制

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力学学报 2024年第1期56卷 130-140页

作者：张欣宇肖玉善吴振任晓辉西北工业大学航空学院西安710072 强度与结构完整性全国重点实验室西安710065 西安航空学院机械工程学院西安710065

本文发展了一种能精确预测含压电层的层合结构和含压电层的功能梯度夹芯结构力电行为的精化高阶理论.此模型位移场使用Reddy型整体-局部高阶理论,满足层间位移和应力连续条件以及自由表面边界条件;电势使用Layerwise分层理论,即对于压... 详细信息

本文发展了一种能精确预测含压电层的层合结构和含压电层的功能梯度夹芯结构力电行为的精化高阶理论.此模型位移场使用Reddy型整体-局部高阶理论,满足层间位移和应力连续条件以及自由表面边界条件;电势使用Layerwise分层理论,即对于压电层较薄的结构,电势在厚度方向可假设为线性分布.运用Hamilton原理和主动控制原理,推导了含阻尼压电功能梯度板系统的控制方程.基于精化高阶理论,构建了等几何分析方法,对压电层合结构弯曲行为进行了分析,并验证了精化高阶理论的有效性.此外,探究了铺层角度和功能梯度系数对压电功能梯度层合结构弯曲行为的影响规律,即结构中心点挠度随铺层角度或功能梯度系数增大而减小;功能梯度系数在0~5之间时,功能梯度系数对弯曲行为的影响比铺层角度对弯曲行为的影响更加显著.最后分析了无阻尼压电功能梯度板的动力学响应.当系统的速度反馈增益系数为零时,结构做无衰减震荡;当速度反馈增益系数增大时,结构震荡幅度衰减加快,衰减所需时间减少,从而实现了无阻尼结构受迫振动的振动主动控制.

关键词：精化高阶理论功能梯度板等几何分析主动控制

A strategy resisting wrinkling of sandwich structures reinforced using functionally-graded carbon nanotubes

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中国航空学报:英文版 2023年第9期36卷 243-255页

作者： xiaohui ren Senlin ZHANG Zhen WU School of Mechanical Engineering Xi’an Aeronautical UniversityXi’an 710065China School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China

Sandwich structures have been widely applied in the wing and the horizontal tail of the aircraft,so face sheets of such structure might occur wrinkling deformation in the process of service,which will largely decrease capability of sustaining *** a result,this paper aims at proposing a reasonable strategy resisting wrinkling deformation of sandwich *** this end,an enhanced higher-order model has been proposed for wrinkling analysis of sandwich *** behaviors of a five-layer sandwich plate are firstly analyzed,which is utilized to assess performance of the proposed ***,wrinkling behaviors of four sandwich plates are further investigated by utilizing present model,which have been evaluated by using quasi threedimensional(3D)elasticity solutions,3D Finite Element Method(3D-FEM)results and experimental ***,the present model is utilized to study the buckling and the wrinkling behaviors of sandwich plates reinforced by Carbon Nano Tubes(CNTs).In addition,influence of distribution profile of CNTs on wrinkling behaviors has been analyzed,and a typical distribution profile of CNTs has been chosen to resist wrinkling *** increase of additional weight,the present strategy can effectively resist wrinkling deformation of sandwich plates,which is rarely reported in published literature.

关键词： Buckling Carbon nano tube Functionally graded plate Higher-order model Wrinkling

Higher-order vibration of thick composite and sandwich plates based on an alternative higher-order model

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Chinese Journal of Aeronautics 2023年第3期36卷 406-420页

作者： Jinghui DENG Tangzhen WU Zhen WU Zhengliang LIU xiaohui ren China Helicopter Research and Development Institute Jingdezhen 333001China School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China School of Mechanical Engineering Xi’an Aeronautical UniversityXi’an 710065China

The transverse stretching vibration of thick sandwich plates,which is attributed to largely different stiffness at the adjacent layers,is a challenging issue,and efficient approach for such issue is less reported in the published ***,natural frequencies corresponding to stretching vibration modes are generally neglected in engineering design,which might impact structural safety as frequencies of the exciting force are close to transverse stretching vibration *** paper proposes an alternative higher-order model for dynamic analysis corresponding to the higher-order vibration *** proposed model is classified in the displacement-based equivalent single-layer theory,as the number of displacement parameters in the proposed model is independent of the layer *** continuity of displacements and transverse shear stresses can be fulfilled at the interfaces between the adjacent layers of *** demonstrate the capability of the proposed model,typical examples are analyzed by utilizing the proposed model,the threedimensional finite element method and the chosen higher-order *** comparing with the exact three-dimensional elasticity solutions,it is found that the proposed model can yield more accurate natural frequencies corresponding to the higher-order displacement modes than the selected ***,the factors influencing reasonable prediction of the higher-order frequencies are investigated in detail,which can provide a reference for the accurate prediction of the higher-order frequencies.

关键词： Analytical solution Higher-order theory Natural frequency Sandwich plate Transverse stretching vibration

Impact of aperture on dynamic response of sandwich plates with aluminium face-sheets and PMI core based on an alternative finite element formulation and experiments

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Chinese Journal of Aeronautics 2022年第4期35卷 266-280页

作者： Zhen WU Yongzhi LI Dongjian ZHANG Jie MEI xiaohui ren Rui MA School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China School of Mechanical Engineering Xi an Aeronautical UniversityXi'an 710065China

Apertures generally exist in the sandwich structures attributing to mechanical connection and lightweight, which might induce failure of such structures. Thus, it is required to realize the impact of aperture on mechanical behaviors of sandwich structures. If transverse shear deformations are unable to be described accurately, the reasonable prediction of dynamic behaviors of the form-core sandwich plates with apertures will meet severe challenges due to a large difference of transverse shear modulus at the adjacent layers. Thereby, such issue is less studied by using the efficient models and experimental testing, so an alternative sinusoidal-type finite element formulation is to be proposed to precisely predict dynamic response of the form-core sandwich structures with apertures. The proposed finite element formulation can meet beforehand compatible conditions of transverse shear stresses at the interfaces of adjacent laminates. In order to appraise strictly capability of the proposed model, experimental tests on natural frequencies of three groups of specimens with different apertures have been carried out. Moreover, four specimens in each group are tested to reduce the testing errors, which is less reported in the published literature. In addition,three-dimensional Finite Element Method(3-D FEM) is also selected to account for the good performance of the present model. Finally, the impact of aperture diameter on the natural frequencies of the sandwich structures is both experimentally and numerically investigated, which can serve as a reference for other researchers.

关键词： Dynamic response Sandwich plates Higher-order theory Experimental tests Finite element method

Development of underwater electric manipulator based on interventional autonomous underwater vehicle (AUV)

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第3期25卷 238-250页

作者： xiaohui HU Jiawang CHEN Hang ZHOU Ziqiang ren Ocean cllege Zhejiang UniversityZhoushan 316021China Hainan Institute Zhejiang UniversitySanya 572025China The Engineering Research Center of Oceanic Sensing Technology and Equipment Ministry of EducationZhoushan 316021China

In applications such as marine rescue,marine science,archaeology,and offshore industries,autonomous underwater vehicles(AUVs)are frequently used for survey missions and monitoring tasks,with most operations being performed by manned submersibles or remotely operated vehicles(ROVs)equipped with robotic arms,as they can be operated remotely for days without ***,they require expensive marine vessels and specialist pilots to operate *** exploring oceans are no longer satisfied with the use of manned submersibles and *** is a growing desire for seabed exploration to be performed using smarter,more flexible,and automated *** improving the field operation and intervention capability of AUVs,large-scale and long-range seafloor exploration and sampling can be performed without the support of a mother ship,making it a more effective,economical,convenient,and rapid means of seafloor exploration and sampling operations,and playing a critical role in marine resource *** this study,we explored the integration technology of underwater electric robotic arms and AUVs and designed a new set of electric manipulators suitable for water depths greater than 500 *** reliability of the key components was analyzed by finite element analysis and,based on the theory of robot kinematics and dynamics,simulations were performed to verify the reliability of the key *** were conducted on land and underwater,trajectory tracking experiments were completed,and the experimental data in air and water were compared and ***,the objectives for further research on the autonomous control of the manipulator underwater were proposed.

关键词： Underwater electric manipulator Inverse kinematics Trajectory planning Trajectory tracking accuracy

微生物菌剂对滴灌棉田土壤养分和棉花产量及品质的影响

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新疆农业科学 2024年第1期61卷 26-33页

作者：罗林毅陈瑞杰阮向阳任晓辉曲奥苏海婷冶军石河子大学农学院新疆石河子832003

【目的】研究不同微生物菌剂施用量对土壤养分活化、棉花产量及品质的影响,为滴灌棉田合理施用微生物菌剂提供参考。【方法】采用室内培养与田间小区试验相结合方法,室内培养将微生物菌剂施入含有土壤的培养盒中,分别培养0、5、10、15、... 详细信息

【目的】研究不同微生物菌剂施用量对土壤养分活化、棉花产量及品质的影响,为滴灌棉田合理施用微生物菌剂提供参考。【方法】采用室内培养与田间小区试验相结合方法,室内培养将微生物菌剂施入含有土壤的培养盒中,分别培养0、5、10、15、20 d,分析微生物菌剂对土壤养分活化效率最大的时间;田间小区试验设置4个处理:CK(不施微生物菌剂)、T_(1)(施微生物菌剂75 L/hm^(2))、T_(2)(施微生物菌剂150 L/hm^(2))、T_(3)(施微生物菌剂300 L/hm^(2)),每个处理设3个重复,分析微生物菌剂对土壤养分和棉花产量及品质的影响。【结果】0~20 cm、20~40 cm土层的有效硅、有效磷、速效钾含量随着施用微生物菌剂的增加而增加,T_(3)处理效果最显著。T_(3)处理的单铃重较CK增加8.7%,产量增加14.6%。T_(3)处理的绒长、断裂比强度、纺纱均匀性指数较CK显著增加;马克隆值由C_(2)级提高至B_(2)级。【结论】微生物菌剂施入土壤的第5 d对土壤养分的活化效果最佳,且能够增加土壤有效硅、有效磷、速效钾的有效含量,提高棉花产量并改善品质。

关键词：微生物菌剂养分活化棉花品质产量