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Adaptation of microbial communities to multiple stressors associated with litter decomposition of Pterocarya stenoptera

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Journal of Environmental Sciences 2014年第5期26卷 1001-1013页

作者： Gaozhong pu Jingjing tong Aimeng Su Xu Ma Jingjing Du Yanna Lv Xingjun Tian School of life Science Nanjing University Guangxi Institute of Botany Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences

To understand the further impacts of multiple stressors in freshwater, we investigated the effects of heavy metal （HM, Cu and Zn） and nutrient enrichments （nitrogen and phosphorus, NP） on microbial decomposition of Pterocarya stenoptera litter and the associated extracellular enzyme activities and microbial biomass with microcosms. Results showed that the decomposition rates were slower in the polluted stream waters than those in the unpolluted ones, which corresponded to lower microbial biomass and integrated enzyme activities of cellulose and ^-glucosidase. The decomposition rates were accelerated at low HM level, which was associated with the stimulated enzyme activities of hydrolytic enzymes or was stimulated by both NP levels in polluted stream waters. In particular, the hydrolase enzyme activities of microbial communities in polluted stream waters were stimulated by low HM level, suggesting that low HM level-stimulated litter decomposition may be due to the increased enzymatic activities. When microbial communities were exposed to HM and NP simultaneously, the inhibitory effect （in unpolluted stream waters） or the stimulated effect （in polluted stream waters） of low HM concentration was enhanced and attenuated, respectively, which suggests that the NP antagonistic effect against HM toxicity on litter decomposition may contribute to the litter- associated extracellular enzyme activities. These results suggest that the may have antagonistic effects on stream ecosystem functioning. of HM and NP

关键词： leaf decomposition heavy metal and nutrient mixture extracellular enzyme activity community adaptation microbial community

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ZnO,TiO_2,SiO_2,and Al_2O_3 Nanoparticles-induced Toxic Effects on Human Fetal Lung Fibroblasts

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Biomedical and Environmental Sciences 2011年第6期24卷 661-669页

作者： ZHANG Xiao Qiang YIN li Hong TANG Meng pu Yue pu School of public Health Southeast University Nanjing 210009 Jiangsu China Key Laboratory of Environmental Medicine and Engineering Ministry of Education Southeast University Nanjing 210009 Jiangsu China

Objective This study aims to investigate and compare the toxic effects of four types of metal oxide （ZnO, TiO2, SiO2, and Al2O3） nanoparticles with similar primary size （-20 nm） on human fetal lung fibroblasts （HFL1） in *** The HFL1 cells were exposed to the nanoparticles, and toxic effects were analyzed by using MTT assay, cellular morphology observation and Hoechst 33 258 *** The results show that the four types of metal oxide nanoparticles lead to cellular mitochondrial dysfunction, morphological modifications and apoptosis at the concentration range of 0.25-1.50 mg/mL and the toxic effects are obviously displayed in dose-dependent manner. ZnO is the most toxic nanomaterials followed by TiO2, SiO2, and Al2O3 nanoparticles in a descending *** The results highlight the differential cytotoxicity associated with exposure to ZnO, TiO2, SiO2, and Al2O3 nanoparticles, and suggest an extreme attention to safety utilization of these nanomaterials.

关键词： Metal oxide nanoparticles Toxic effects Fibroblasts

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Fang-Howard wave function modelling of electron mobility in AlinGaN/AlN/InGaN/GaN double heterostructures

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Chinese Physics B 2021年第9期30卷 451-455页

作者： Yao li Hong-Bin pu Department of Electronic Engineering Xi'an University of TechnologyXi'an 710048China Key Laboratory of Wide Bandgap Semiconductor Materials Ministry of EducationXi'an 710071China Xi'an Key Laboratory of Power Electronic Devices and High Efficiency Power Conversion Xi'an 710048China

To study the electron transport properties in InGaN channel-based heterostructures,a revised Fang-Howard wave function is proposed by combining the effect of GaN back *** scattering mechanisms,such as dislocation impurity(DIS)scattering,polar optical phonon(POP)scattering,piezoelectric field(PE)scattering,interface roughness(IFR)scattering,deformation potential(DP)scattering,alloy disorder(ADO)scattering from InGaN channel layer,and temperature-dependent energy bandgaps are considered in the calculation model.A contrast of AlinGaN/AlN/InGaN/GaN double heterostructure(DH)to the theoretical AlinGaN/AlN/InGaN single heterostructure(SH)is made and analyzed with a full range of barrier alloy *** effect of channel alloy composition on InGaN channel-based DH with technologically important Al(In,Ga)N barrier is estimated and optimal indium mole fraction is 0.04 for higher mobility in DH with Al_(0.4)In_(0.07)Ga_(0.53)N ***,the temperature-dependent two-dimensional electron gas(2DEG)density and mobility in InGaN channel-based DH with Al_(0.83)In_(0.13)Ga_(0.04)N and Al_(0.4)In_(0.07)Ga_(0.53)N barrier are *** results are expected to conduce to the practical application of InGaN channel-based heterostructures.

关键词： scattering mechanism double heterostructures electron mobility InGaN channel

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Ultra‑High Sensitivity Anisotropic Piezoelectric Sensors for Structural Health Monitoring and Robotic Perception

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Nano-Micro Letters 2025年第2期17卷 432-446页

作者： Hao Yin Yanting li Zhiying Tian Qichao li Chenhui Jiang Enfu liang Yiping Guo State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Beijing Vacuum Electronics Research Institute Beijing 100015People’s Republic of China Fundamental Science On Vibration Shock and Noise LaboratoryState Key Laboratory of Mechanical System and VibrationSchool of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Monitoring minuscule mechanical signals,both in magnitude and direction,is imperative in many application scenarios,e.g.,structural health monitoring and robotic sensing ***,the piezoelectric sensor struggles to satisfy the requirements for directional recognition due to the limited piezoelectric coefficient matrix,and achieving sensitivity for detecting micrometer-scale deformations is also ***,we develop a vector sensor composed of lead zirconate titanate-electronic grade glass fiber composite filaments with oriented arrangement,capable of detecting minute anisotropic *** as-prepared vector sensor can identify the deformation directions even when subjected to an unprecedented nominal strain of 0.06%,thereby enabling its utility in accurately discerning the 5μm-height wrinkles in thin films and in monitoring human pulse *** ultra-high sensitivity is attributed to the formation of porous ferroelectret and the efficient load transfer efficiency of continuous lead zirconate titanate ***,when integrated with machine learning techniques,the sensor’s capability to recognize multi-signals enables it to differentiate between 10 types of fine textures with 100%*** structural design in piezoelectric devices enables a more comprehensive perception of mechanical stimuli,offering a novel perspective for enhancing recognition accuracy.

关键词： Flexible piezoelectric filaments Anisotropic Ultra-high sensitivity Structural health detection Texture recognition

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Effective technology for processing industrial volatile organic compounds by the atmospheric pressure microwave plasma torch

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Journal of Electronic Science and Technology 2023年第2期21卷 87-94页

作者： Da-Shuai li ling tong Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou313001China School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu611731China

In this study,we investigated the abatement of volatile organic compounds(VOCs)by the atmospheric pressure microwave plasma torch(AMPT).To study the treatment efficiency of AMPT,we used the toluene and water-based varnish to simulate VOCs,*** measuring the compounds and contents of the mixture gas before/after the microwave plasma process,we have calculated the treatment efficiency of *** experimental results show that the treatment efficiency of AMPT for toluene with a concentration of 17.32×10^(4) ppm is up to 60 g/kWh with the removal rate of 86%.For the volatile compounds of water-based varnish,the removal efficiency is up to 97.99%.We have demonstrated the higher potential for VOCs removal of the AMPT process.

关键词： Atmospheric microwave plasma Industrial volatile organic compounds(VOCs)processing Spectroscopic diagnostic

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Reaction Kinetics of Trans-Sobrerol and 8-p-Menthen-1,2-diol with Hydroxyl Radical in Aqueous Solution： A Combined Experimental and Theoretical Study

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Chinese Journal of Chemical Physics 2015年第3期28卷 308-314,I0001,I0002页

作者： Yan Long Xin tong tong-mei Ma li-ming Wang School of Chemistry & Chemical Engineering South China University of Technology Guangzhou 510640 China Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control South China University of Technology Guangzhou 510006 China

Trans-sobrerol （Sob） and 8-p-menthen-1,2-diol （limo-diol） are the primary products in the atmospheric oxidation of α-pinene and limonene, respectively. Because of their low volatility, they associate more likely to the liquid particles in the atmosphere, where they are subject to the aqueous phase oxidation by the atmospheric oxidants. In this work, through experimental and theoretical study, we first provide the rate constants of Sob and limo-diol reacting with hydroxyl radical （.OH） in aqueous solution at room temperature of 3044-3 K and 1 atm pressure, which are （3.05±0.5）×10 9 and （4.57±0.2）×10 9 L/（mol.s）, respectively. Quantum chemistry calculations have also been employed to demonstrate the solvent effect on the rate constants in aqueous phase and the calculated results agree well with the measurements. Some reaction products have been identified based on liquid chromatography combined with mass spectroscopy and theoretical calculations.

关键词： Unsaturated alcohols Hydroxyl radical Aqueous-phase reaction Kinetic Theoretical calculations

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Gravitational Instability in Neutrino Dominated Accretion Disks

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Chinese Physics Letters 2011年第12期28卷 309-311页

作者： liU tong XUE li Department of Physics and Institute of Theoretical Physics and Astrophysics Xiamen UniversityXiamen 361005

We revisit the vertical structure of neutrino-dominated accretion flows(NDAFs)in spherical coordinates under a boundary condition based on a mechanical *** solutions show that the NDAF is significantly geometrically *** Toomre parameter is determined by the mass accretion rate and the viscosity parameter,which is defined as Q=cSΩ/πGΣ,where cS,ΩandΣare the sound speed,angular velocity and surface density,*** to the distribution of the Toomre parameter,the possible fragments of the disk may appear near the disk surface in the outer *** possible outflows originating from the gravitational instability of the disk may account for the late-time flares in gamma-ray bursts.

关键词： parameter viscosity coordinates

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Real-time Energy Management Method for Electric-hydrogen Hybrid Energy Storage Microgrids Based on DP-MPC

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 324-336页

作者： Qi li Xueli Zou Yuchen pu Weirong Chen School of Electrical Engineering Southwest Jiaotong UniversityChengdu 611756China

With the increasing presence of intermittent energy resources in microgrids,it is difficult to precisely predict the output of renewable resources and their load *** order to realize the economical operations of the system,an energy management method based on a model predictive control(MPC)and dynamic programming(DP)algorithm is *** method can reasonably distribute the energy of the battery,fuel cell,electrolyzer and external grid,and maximize the output of the distributed power supply while ensuring the power balance and cost optimization of the *** on an ultra-shortterm forecast,the output power of the photovoltaic array and the demand power of the system load are *** offline global optimization of traditional dynamic programming is replaced by the repeated rolling optimization in a limited period of time to obtain power values of each unit in the energy storage *** with the traditional DP,MILP-MPC and the logic based real-time management method,the proposed energy management method is proved to be feasible and effective.

关键词： Electric-hydrogen hybrid energy economic energy management improved dynamic programming microgrid model predictive control

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Surface Elastic Effects on Electromechanical Responses of a Piezoelectric Semiconducting Nanobeam

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Acta Mechanica Solida Sinica 2024年第4期37卷 598-612页

作者： Aowen Bao Xiaobao li Yuxue pu Chunxiao Zhan School of Civil Engineering Hefei University of TechnologyHefei230009China

Piezoelectric semiconductors(PSCs)find extensive applications in modern smart electronic devices because of their dual properties of being piezoelectric and *** the increasing demand for miniaturization of these devices,the performance of their components needs to be carefully designed and optimized,especially when reduced to *** has been shown that surface elastic properties play a substantial role in the mechanical performance of nanoscale materials and *** on this understanding,the surface elastic effects,encompassing surface residual stress,surface membrane stiffness,and surface bending stiffness,are comprehensively taken into account to explore the electromechanical responses of a PSC ***,the flexoelectric effect on their responses is also systematically *** results of this work reveal that surface elastic properties predominantly influence mechanical performance,while the flexoelectric effect plays a more dominant role in electric-related quantities at the ***,the significance of surface bending rigidity,which was often underestimated in the earlier literature,is ***,owing to the flexoelectric effect,the linear distribution of electric potential and charge carriers along the length transforms into a nonlinear *** distributions of electric potential and charge carriers across the cross section are also evidently ***,the size-dependent responses are *** findings may provide valuable insights for optimizing electronic devices based on nanoscale PSCs.

关键词： Surface elastic effect Flexoelectricity Size effect Piezoelectric semiconductor

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The formation mechanism of accretionary wedge at Karamay in West Junggar,NW China

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Science China Earth Sciences 2017年第3期60卷 546-556页

作者： YANG GaoXue li YongJun tong lili li GanYu Earth Science and Resources College Chang'an UniversityXi'an 710054China

Accretionary wedge is the typical product of subduction-zone processes at shallow depths. Determining the location, composition and mechanism of accretionary wedge has important implications for understanding the tectonism of plate subduction. The Central Asian Orogenic Belt （CAOB） is one of the world＇s largest accretionary orogenic belts, and records the bulk evolution of Paleo-Asian Ocean from opening to closure, with multi-stages and multi-types of crust-mantle interaction in the Paleozoic. West Junggar （western part of Junggar Basin）, located in the core area of CAOB, is characterized by a multiple intra-oceanic subduction system during the Paleozoic. In its eastem part crop out Devonian-Carboniferous marine sedimentary rocks, Darbut and Karamay ophiolitic m61anges, alkali oceanic island basalts, island arc volcanic rocks and thrusted nappe structure. Such lithotectonic associations indicate the occurrence of accretionary wedge at Karamay. In order to decipher its formation mechanism, this paper presents a synthesis of petrography, structural geology and geochemistry of volcanic rocks. In combination with oceanic subduction channel processes, it is suggested that the accretionary wedge is a composite melange with multiple stages of formation. The application of oceanic subduction channel model to the Karamay accretionary wedge provides new insights into the accretion and orogenesis of CAOB.

关键词： Oceanic crust Subduction zone Geochemistry Oceanic island basalt Ophiolitic melange Accretionary wedge West Junggar

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