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Roles of straw return in shaping denitrifying bacteria in rice rhizosphere soils through effects on root exudates and soil metabolites

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Soil Ecology Letters 2025年第1期7卷 39-51页

作者： Pei Chen Yu Cheng Ning Wang Jian-Guang Yu Ying Zhao Li-Hong Xue Key Laboratory of Agro-Environment in Downstream of Yangtze Plain Ministry of Agriculture and Rural Affairs of the People’s Republic of ChinaJiangsu Academy of Agricultural SciencesNanjing 210014China School of the Environment and Safety Engineering Jiangsu UniversityZhenjiang 212001China School of the Environment and Safety Engineering Jinan UniversityJinan 212001China School of Environmental Science and Engineering Yancheng Institute of TechnologyYancheng 224051China

Rhizosphere denitrification is affected by straw ***,the roles of root exudates and soil metabolites in shaping denitrifying bacteria under wheat straw return are relatively ***,wheat straw was amended at 2%(w/w)to two paddy soils with different levels of nitrogen for rice cultivation,which altered the denitrifying bacterial community compositions of both ***,straw amendment decreased the abundances of the nirS and nosZ genes by 63.7%and 30.3%in the low nitrogen soil from Taizhou(TZ)but increased the nirK,nirS,and nosZ gene abundances by 116%,81.0%,and 155.5%for the high nitrogen soil from Yixing(YX).Correspondingly,straw amendment decreased the relative abundance of root exudates in the categories of amino acids and benzenes for rice cultivated in TZ soil but increased the relative abundance of root exudates in the categories of amino acids for rice grown in YX *** elevated root exudates,straw amendment enhanced the relative abundances of many soil metabolites in YX soil such as sorbitol,myristic acid,and pentadecanoic acid,with fold changes>*** results suggest that straw return may alter the composition of root exudates and soil metabolites thereby affecting rhizosphere denitrifying bacterial communities and function genes.

关键词： straw return denitrifying bacteria soil organic carbon root exudates metabolites

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Enzyme-like adaptive Fe-oxo-Co motifs boost oxygen reduction reaction for efficient Zn-air batteries

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Nano Research 2025年第4期18卷 134-143页

作者： Tian Xia Jiawei Wan Xu Zhou Yilei He Fengmei Su Bifa Ji Yongping Zheng Dan Wang Ranbo Yu Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China Key Laboratory of Biopharmaceutical Preparation and Delivery Institute of Process Engineering Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Advanced Energy Storage Technology Research Center Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055China College of Chemistry and Environment Engineering Shenzhen UniversityShenzhen 518060China

Enzyme-like metal atomic site catalysts are promising alternatives of platinum group metals for oxygen reduction reaction(ORR)in fuel cell *** local coordination structure at metal atomic sites plays a dominant role in optimizing the adsorption/desorption of oxygen intermediates to enhance ORR,but there is still a significant challenge in ***,we report a type of stable and dynamically adjustable mono-oxygen-bridged asymmetric dual-atomic metal catalyst,in which the active Fe-oxo-Co motif demonstrates platinium-like ORR activity with a half-wave potential of 0.92 V *** in alkaline condition and a maximum power density of 228 mW·cm^(-2) in Zn-air *** calculations reveal that the Fe-oxo ligands can act as electron regulators for neighboring Co sites,which optimize and promote the d-orbitals of Co metal shift towards lower energy levels,thereby weakening the adsorption of oxygen species,facilitating the progress of the *** interestingly,the Fe-oxo-Co bond will dynamically change its strength to adaptively facilitate the intermediate steps during the ORR *** design strategy towards enzyme-like adaptive behavior of active Fe-oxo-Co motifs brings significant hope for achieveing high performance fuel cell cathode materials.

关键词： adaptive oxygen reduction reaction dual atomic site Zn-air battery

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Degradation Kinetics of Nitrobenzene and Aniline by Fe-N/BC Redox System 6

Degradation Kinetics of Nitrobenzene and Aniline by Fe-N/BC ...

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2024 6th International Conference on Advanced Materials and Ecological environment, AMEE 2024

作者： Zhou, Ting Yang, Yang Du, Tianxing Dong, Wenyi Wang, Hongjie School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Guangdong Shenzhen518055 China Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control Guangdong Shenzhen518055 China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of Technology Heilongjiang Harbin150090 China

This study was aimed to analysis the degradation kinetics of nitrobenzene and aniline by the Fe-N/BC redox system. Factors such as the initial pH of the solution, PMS/NaBH4 concentrations, and pollutant concentrations were investigated to explore the variations in pollutant degradation rates in the system. The results indicated that the Fe-N/BC-catalyzed NaBH4 reduction of nitrobenzene followed first-order kinetics, while the Fe-N/BC-catalyzed PMS oxidation of aniline followed pseudo-first-order kinetics. When the pH was alkaline, the reaction was inhibited. Increasing the addition of NaBH4 and PMS from 0.05 to 0.5 g/L resulted in the reaction rate constants for nitrobenzene and aniline increasing from 0.115, 0.120 min-1 to 0.743, 0.354 min-1, respectively. As the pollutant concentration gradually rose from 2 to 50 mg/L, the reactions were inhibited, with the reaction kinetics for nitrobenzene and aniline decreasing from 0.348, 0.288 min-1 to 0.147, 0.091 min-1, respectively. © Published under licence by IOP Publishing Ltd.

关键词： Nitrobenzene

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Optimizing Computed Tomography Processing Parameters for Accurate Detection of Internal Defects in Reinforced Concrete

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Structural Durability & Health Monitoring 2025年第3期19卷 575-592页

作者： Yueshun Chen Yupeng Zhou Cao Yin School of Civil Engineering Architecture and Environment Department of Architectural EngineeringHubei University of TechnologyWuhan430068China Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes Ministry of EducationHubei University of TechnologyWuhan430068China Changjiang International Water Conservancy and Hydropower Engineering Construction Co. Ltd.Wuhan430040China

Computed tomography(CT)can inspect the internal structure of concrete with high resolution,but improving the accuracy of measurements remains a key challenge due to the reliance on complex image processing and significant manual *** study aims to optimize CT scanning parameters to enhance the accuracy of measuring crack widths and rebar volumes in reinforced *** sets of specimens,each with varying rebar diameters and concrete cover thicknesses,were scanned before and after corrosion using an Optima CT scanner,followed by three-dimensional reconstructions using Avizo *** effects of threshold values and“Erosion”coefficients on measurement accuracy were *** results demonstrated that an optimal lower threshold of 2950,combined with an‘Erosion’coefficient of 6,effectively limits the measurement error of rebar volumes to within 1%.The optimal threshold for measuring crack widths was influenced by the crack width,rebar diameter,and concrete cover ***,an optimized formula for determining crack measurement thresholds was *** study significantly improves the accuracy of CT-based non-destructive testing(NDT)techniques,providing valuable insights for structural health monitoring(SHM).

关键词： Computed tomography concrete structure cracks Avizo non-destructive testing 3D visualisation

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Spatial and Temporal Distribution of Metal Elements in the Rivers of Northern Jiangsu Province

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Journal of Ocean University of China 2025年第1期24卷 157-168页

作者： YUAN Liping LIU Qian JIAN Huimin MI Tiezhu YANG Fuxia YAO Qingzhen Frontiers Science Center for Deep Ocean Multispheres and Earth System and Key Laboratory of Marine Chemistry Theory and TechnologyMinistry of EducationOcean University of ChinaQingdao 266100China Laboratory of Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Land and Sea Ecological Governance and Systematic Regulation of the Ministry of Ecology and Environment Shandong Academy for Environmental PlanningJinan 250101China

The concentrations of V,Cr,Mn,Fe,Co,Ni,Cu,Zn,As,Mo,Cd,and Pb were determined in Doulonggang River,Xinyanggang River,Huangshagang River,Sheyanghe River,Guangaizongqu River,and Linhonghe River at the North of Jiangsu Province in *** annual average concentrations of V,Cr,Mn,Fe,Co,Ni,Cu,Zn,As,Mo,Cd and Pb in the six rivers were 2.20,1.22,4.53,21.9,0.13,2.79,1.77,4.00,2.97,3.87,0.01,0.19μg L^(-1)*** highest concentration of most trace metals were found in Guangaizongqu River and Linhonghe River,and the lowest concentration were found in Xinyanggang River and Huangshagang *** principal component analysis(PCA)resulted of two factors together explained 91.2%of the variance with>1initial eigenvalue,indicating that both natural and anthropogenic activities were contributing factors as the source of metal abundance in rivers of northern Jiangsu *** first major component represented the influence of anthropogenic activities,including industry and agriculture,with a contribution rate of 54.1%,affected Cr,Fe,Cu,Zn,Mo,Cd and *** second(such as V,Mn,Co,Ni,As)was a mixed source,including the natural processes such as precipitation,erosion and weathering and anthropogenic action like industry and agriculture,with a contribution rate of 37.1%.Seasonal variations in trace metal concentrations were influenced by temperature,salinity,water discharge,and input of external *** highest concentrations were found in wet season and were strongly influenced by rainfall and seasonal industrial and agricultural activities.

关键词： trace metal distribution rivers northern Jiangsu Province

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The influence of geosynthetic properties on their shear behaviors at the interface with frozen soil

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Geotextiles and Geomembranes 2025年第2期53卷 497-509页

作者： He, Pengfei Hou, Guangliang Cao, Haitao Yue, Feng School of Civil Engineering Lanzhou University of Technology 287 Langongping Rd. Lanzhou730000 China State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and Resources 320 Donggangxilu Rd. Lanzhou730000 China Lanzhou GongDa Engineering Testing Technology Co.ltd 194 Xijinxilu Rd Lanzhou730050 China

This paper investigates the shear properties of the interfaces between sand and short-staple nonwoven geotextile (GT1), long-staple nonwoven geotextile (GT2), and geomembrane (GM) under varying conditions of testing temperature, sand moisture content, and normal stress through temperature-controlled direct shear tests. The results reveal that the shear stress-shear displacement curves for the sand-GT1 and sand-GM interfaces can be broadly categorized into an elastic deformation stage, a nonlinear growth stage, and a stable stage. However, the sand-GT2 interface displays a continuously increasing trend throughout the experiment. The peak friction angles of the interfaces increase significantly as the temperature decreases, following the order GT1 > GT2 > GM. The average residual friction angle of sand with GT1, GT2, and GM decreased by 14.8%, 10.4%, and 31.1%, respectively, compared to the peak friction angle. The peak cohesion at the sand-GM interface is relatively weaker than that at the sand-GT1 and sand-GT2 interfaces. The shear mechanisms between frozen soil and geotextiles involve ice cementation, rolling, interlocking, and fiber tensioning, while the shear mechanisms between frozen soil and GM comprise ice cementation, rolling, indentation, and plowing. © 2024 Elsevier Ltd

关键词： Shear strength

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Microplastics in the seawater of the Beibu Gulf,the northern South China Sea:occurrence,sources,and ecological risk

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Journal of Oceanology and Limnology 2025年第2期43卷 406-421页

作者： Zuhao ZHU Qiongyuan SU Huihua WEI Lang LIN Liangliang HUANG Guangxi Key Laboratory of Beibu Gulf Marine Resources Environment and Sustainable DevelopmentFourth Institute of OceanographyMinistry of Natural ResourcesBeihai 536000China Key Laboratory of Tropical Marine Ecosystem and Bioresource Fourth Institute of OceanographyMinistry of Natural ResourcesBeihai 536000China College of Environmental Science and Engineering Guilin University of TechnologyGuilin 541004China Key Laboratory of Tropical Marine Bio-resources and Ecology Guangdong Provincial Key Laboratory of Applied Marine BiologySouth China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Sanya Institute of Ocean Eco-Environmental Engineering Sanya 572100China

In this study,the occurrence,sources,and ecological risk of microplastics(>60μm)in the surface and bottom seawater were investigated in the Beibu Gulf,the northern South China *** average abundance of microplastics in surface and bottom waters was 1.35±0.93 and 0.79±0.50 items/m~3,*** in both surface and bottom waters were predominantly in the form of fragments,and mostly in *** composition of microplastics in surface water was primarily poly(methyl methacrylate)(PMA),whereas in bottom water,polyethylene(PE)*** matrix factorization(PMF)modeling revealed that the primary sources of microplastics were pipeline abrasion,fishing activities,plastic waste,landfill disposal,transportation,aquaculture,and construction *** pollution load index(PLI)indicated that the overall risk of microplastic pollution in the Beibu Gulf was ***,the polymer hazard index(PHI)for microplastics was relatively *** data underscore the importance of timely and effective reduction of human-intensive activities contributing to microplastic pollution and provide valuable information for further research in microplastic ecotoxicology and biogeochemistry.

关键词： microplastic seawater source ecological risk Beibu Gulf

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Comprehensive Modeling and Dynamic Stiffness Analysis of an Electromechanical Fin-Actuator System Considering Multiple Nonlinear Couplings

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Journal of Computational and Nonlinear Dynamics 2025年第6期29卷

作者： Cao, DongXing Zhou, YiWei Zhou, XinXing Gao, Chi Guo, XiangYing Liu, CaiShan Zhang, Zhong Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures Department of Mechanics Beijing University of Technology Beijing100124 China School of Mechanical and Energy Engineering Beijing University of Technology Beijing100124 China State Key Laboratory for Turbulence and Complex Systems College of Engineering Peking University Beijing100871 China Key Laboratory of Reliability and Environment Engineering Technology Beijing Institute of Structure and Environment Engineering Beijing100076 China

Electromechanical actuators play a crucial role in diverse engineering and physics fields, particularly in the aerospace and automotive industries. Their dynamic characteristics significantly affect the aeroelastic behavior of fins, especially regarding the flutter boundary. Nevertheless, ascertaining the dynamic characteristics of these actuators requires navigating the intricate interactions of multiple linear and nonlinear components. This study introduces a high-fidelity dynamic model designed to effectively address the complexities inherent in an electromechanical fin-actuator system. The model incorporates essential nonlinear elements, such as friction torque and dynamic backlash, along with fundamental components like the gear reducer, ball screw, transmission fork, and servomotor. To clarify these complex interactions, advanced models, namely, the LuGre model, the Bai model (an enhanced version of the Flores model), and the Kahraman model—are integrated into our framework. A comparative analysis is conducted between this complex nonlinear model and a simpler linear counterpart. This comparison is facilitated by rigorous numerical simulations that employ stepped frequency sweeping across various parameter configurations. The findings reveal that the dynamic stiffness characteristics of the fin shaft are markedly complicated under the combined effects of numerous nonlinear factors. Specifically, nonlinear friction originating from the friction ring diminishes response amplitude and seemingly augments the dynamic stiffness of the actuator due to reduced deflections under loads. Conversely, increased clearance among components can lead to a decrement in the dynamic stiffness amplitude of the actuator. ©2025 by ASME.

关键词： Ball screws

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Investigation into enhanced performance of toluene and Hg^(0) stimulative abatement over Cr-Mn oxides co-modified columnar activated coke

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Journal of environmental Sciences 2025年第2期148卷 88-106页

作者： Jiajie Wang Jie Liu Lei Gao Dong Xie Caiting Li Liping Xiang Huiyu Xiong Jiaqi Xie Tianren Zhang Yueguo Pan School of Resources Environment and Safety Engineering University of South ChinaHengyang 421001China National&Local Joint Engineering Research Center for Airborne Pollutants Control and Radioactivity Protection in Buildings Hengyang 421001China Key Laboratory of Prefabricated Building Energy Saving Technology of Hunan Province Hengyang 421001China College of Environmental Science and Engineering Hunan UniversityChangsha 410082China

In this study,a string of Cr-Mnco-modified activated coke catalysts(XCryMn1-y/AC)were prepared to investigate toluene and Hg^(0) removal *** characterizations including XRD,TEM,SEM,in situ DRIFTS,BET,XPS and H_(2)-TPR showed that 4%Cr0.5Mn0.5/AC had excellent physicochemical properties and exhibited the best toluene and Hg^(0) removal efficiency at 200℃.By varying the experimental gas components and conditions,it was found that too large weight hourly space velocity would reduce the removal efficiency of toluene and Hg^(0).Although O_(2) promoted the abatement of toluene and Hg^(0),the inhibitory role of H_(2)O and SO_(2) offset the promoting effect of O_(2) to some *** significantly inhibited Hg^(0) removal,resulting from that toluene was present at concentrations orders of magnitude greater than mercury’s or the catalyst was more prone to adsorb toluene,while Hg^(0) almost exerted non-existent influence on toluene *** mechanistic analysis showed that the forms of toluene and Hg^(0) removal included both adsorption and oxidation,where the high-valent metal cations and oxygen vacancy clusters promoted the redox cycle of Cr^(3+)+Mn^(3+)/Mn^(4+)+Cr^(6+)+Mn^(2+),which facilitated the conversion and replenishment of reactive oxygen species in the oxidation process,and even the CrMn_(1.5)O_(4) spinel structure could provide a larger catalytic interface,thus enhancing the adsorption/oxidation of toluene and Hg^(0).Therefore,its excellent physicochemical properties make it a costeffective potential industrial catalyst with outstanding synergistic toluene and Hg^(0) removal performance and preeminent resistance to H_(2)O and SO_(2).

关键词： Toluene Element mercury Cr-Mn oxides Activated coke

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Viscous Flow Activation Energy and Short-Term Aging Resistance of SBS-Modified Asphalt Enhanced by PPA Oil-Grinding Activated MoS_(2)

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Fluid Dynamics & Materials Processing 2025年第2期21卷 387-404页

作者： Shun Chen Yingjie Wang Xingyang He Ying Su Yingyuan Pan Yimin Cao Wentian Wang Chao Yang Bo Jiang Shaolin Zhang School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China Building Waterproof Engineering and Technology Research Center of Hubei Province Hubei University of TechnologyWuhan430068China Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes Ministry of EducationHubei University of TechnologyWuhan430068China China Construction Third Bureau First Engineering Co. Ltd.China

Styrene-butadiene-styrene(SBS)modified asphalt(SA)has long found effective applications in road construction *** combined with fillers,SBS-modified asphalt has demonstrated promising resistance to fatigue cracking caused by temperature fluctuations and *** this study,molybdenum disulfide(MoS_(2))and polyphosphoric acid(PPA)were ground in naphthenic oil(NO)and subjected to mechanical activation to create PPAmodified MoS_(2),referred to as *** blending various ratios of OMS-PPA with SBS-modified asphalt,composite-modified asphalts were successfully developed to enhance their overall *** assess the mechanical characteristics and stability of these modified asphalts,various methods were employed,including penetration factor,flow activation energy,fluorescence microscopy,and dynamic shear ***,the short-term aging performance was evaluated using Fourier transform infrared(FTIR)spectroscopy and nanoindentation *** results revealed a 3.7%decrease in the penetration-temperature coefficient for SAOMS compared to SA,while 1-SA-OMS-PPA showed an even greater reduction of 7.1%.Furthermore,after short-term aging,carboxyl group generation in SA increased by 5.93%,while SA-OMS exhibited a smaller rise of 1.36%,and 1-SA-OMS-PPA saw an increase of just 0.93%.The study also highlighted significant improvements in the hardness of these *** hardness change ratio for SA-OMS decreased by 43.08%,while the ratio for 1-SA-OMS-PPA saw a notable reduction of 65.16% compared to unmodified *** findings suggest that OMS-PPA contributed to improvements in temperature sensitivity,particle dispersibility,and resistance to shortterm aging in *** results hold significant promise for the future development of advanced asphalt-based materials with potential high-value applications in flexible pavements for highways.

关键词： Composite-modified asphalt grinding viscous flow activation energy short-term aging collaborated

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