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Environmental dynamics of nitrogen and phosphorus release from river sediments of arid areas

Journal of Arid Land 2024年第5期16卷 685-698页

作者： su Wenhao WU chengcheng sun Xuanxuan LEI Rongrong LEI Li WAng Ling ZHU Xinping College of Bioscience and Resources Environment Beijing University of AgricultureBeijing 102206China Xinjiang Tianxi Environmental Protection Technology Co.Ltd. Urumqi 830000China College of Resources and Environment Sciences Xinjiang Agricultural UniversityUrumqi 830052China

Human activities lead to the accumulation of a large amount of nitrogen and phosphorus in sediments in ***,nitrogen and phosphorus can be affected by environment and re-enter the upper water body,causing secondary pollution of the river *** this study,laboratory simulation experiments were conducted initially to investigate the release of nitrogen and phosphorus from river sediments in Urumqi City and the surrounding areas in Xinjiang Uygur Autonomous Region of China and determine the factors that influence their *** results of this study showed significant short-term differences in nitrogen and phosphorus release characteristics from sediments at different sampling *** proposed secondary kinetics model(i.e.,pseudo-second-order kinetics model)better fitted the release process of sediment nitrogen and *** release of nitrogen and phosphorus from sediments is a complex process driven by multiple factors,therefore,we tested the influence of three factors(pH,temperature,and disturbance intensity)on the release of nitrogen and phosphorus from sediments in this *** most amount of nitrate nitrogen(NO_(3)^(–)-N)was released under neutral conditions,while the most significant release of ammonia nitrogen(NH_(4)^(+)-N)occurred under acidic and alkaline *** release of nitrite nitrogen(NO_(2)^(-)-N)was less affected by *** dissolved total phosphorus(DTP)released significantly in the alkaline water environment,while the release of dissolved organic phosphorus(DOP)was more significant in acidic *** release amount of soluble reactive phosphorus(SRP)increased with an increase in *** sediments released nitrogen and phosphorus at higher temperatures,particularly NH_(4)^(+)-N,NO_(3)^(–)-N,and *** highest amount of DOP was released at 15.0℃.An increase in disturbance intensity exacerbated the release of nitrogen and phosphorus from ***_(4)^(+)-N,DTP,and SRP levels increased linearly with the intens

关键词： sediment nitrogen and phosphorus environmental dynamics pseudo-second-order kinetics model dissolved organic phosphorus(DOP) Urumqi City

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Carbon Isotope Stratigraphy of the Cambrian System in the Eastern Tarim Basin,China

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Acta Geologica Sinica(English Edition) 2022年第4期96卷 1277-1293页

作者： WAng Huajian su Jin WAng Xiaomei yE yuntao WAng yu FAng yu ZHAng Shuichang Research Institute of Petroleum Exploration&Development Beijing 100083China

The ultra-deep Cambrian System in the Tarim Basin is an important field for petroleum exploration,while fine division of the Cambrian strata remains *** recent years,carbon isotope stratigraphy of the Cambrian System has been established and widely ***,we report an integrated profile of carbonate and organic carbon isotopic values(δ^(13)C_(carb)andδ^(13)C_(org))from cuttings of the Tadong2 Well in the eastern Tarim *** carbon isotope anomalies of BACE,ROECE and SPICE were recognized on theδ^(13)C_(carb)*** apogees and a nadir on theδ^(13)C_(org)profile and the onset of ROECE on theδ^(13)C_(carb)profile were suggested as boundaries of the present four series of the Cambrian *** boundaries are easily identifiable on the gamma logging profile and is consistent with the previous division scheme,based on biostratigraphic evidence in outcrop *** carbon cycle perturbations and organic carbon burials during the BACE and SPICE events might be related to the reduction and expansion of a huge dissolved organic carbon reservoir in the deep ocean of the ancient Tarim Basin.

关键词： organic carbon black shale dissolved organic carbon BACE SPICE stratigraphic division

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Transcriptome analysis for understanding the mechanism of dark septate endophyte S16 in promoting the growth and nitrate uptake of sweet cherry

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Journal of Integrative Agriculture 2021年第7期20卷 1819-1831页

作者： WU Fan-lin QU De-hui TIAN Wei WAng Meng-yun CHEN Fei-yan LI Ke-ke suN ya-dong su y.ng-hua y.ng Li-na su Hong-yan WAng Lei Key Laboratory of Molecular Module-Based Breeding of High yield and Abiotic Resistant Plants in Universities of Shandong School of AgricultureLudong UniversityYantai 264025P.R.China College of Life Sciences Ludong UniversityYantai 264025P.R.China State Key Laboratory of Microbial Metabolism and School of Life Sciences&Biotechnology Shanghai Jiao Tong UniversityShanghai 200240P.R.China State Key Laboratory of Crop Biology College of Life SciencesShandong Agricultural UniversityTai'an 271018P.R.China Department of Genetics and Cell Biology Basic Medical CollegeQingdao UniversityQingdao 266071P.R.China

Sweet cherry is one of the most popular fresh fruits in the ***,we isolated a soilborne dark septate endophyte(DSE)strain,S16,which promoted the growth of Gisela 5 sweet cherry ***,little is known about the molecular mechanism of the effect of S16 on the growth of sweet *** this study,the physiological parameters and transcript profiles of sweet cherry roots were analyzed under S16 treatment compared with a control to elucidate the molecular mechanisms of the effect of this strain on sweet cherry *** inoculation with S16,sweet cherry seedlings exhibited more vigorous ***,we identified 4249 differentially expressed genes(DEGs)between S16-treated plants and the *** of the DEGs are involved in pathways related to plant growth,such as cellular metabolic and plant hormone ***,some genes involved in nitrate regulation were also enriched;and these genes may be involved in the regulation of nitrate uptake in *** index detection demonstrated that S16 could improve the nitrate assimilation of sweet cherry via NO3–*** RNA-seq dataset provides comprehensive insight into the transcriptomic landscape to reveal the molecular mechanisms whereby the DSE influences the growth of sweet cherry.

关键词： sweet cherry dark septate endophyte RNA-seq growth NO3–transporters

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Carambola-like metal-organic frameworks for high-performance electrocatalytic oxygen evolution reaction

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Journal of Energy Chemistry 2021年第2期30卷 358-363,I0012页

作者： Zhi Gao Longhui Xiao Xuemin su Xiangqing He yi yu Xinhui Huang Feng Luo State Key Laboratory of Nuclear Resources and Environment School of BiologyChemistry and Material ScienceEast China University of TechnologyNanchang 330013JiangxiChina

Hydrogen production by electrocatalytic water splitting promises a green and sustainable technology to address serious energy crisis and environmental pollution [1]. As well known, the process of electrocatalytic water splitting is composed of two half reaction, i.e. oxygen evolution reaction (OER) at the anode and hydrogen evolution reaction (HER) at the cathode [2].

关键词： Carambola-like nanostructure Metal-organic frameworks Bimetallic synergy effect Oxygen evolution reaction

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1940—2022年北极夏冬季2 m气温变化及可能驱动机制研究

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地球物理学报 2024年第11期67卷 4043-4052页

作者：李亚云成巍宿兴涛高睿智慧地球重点实验室北京100029 北京应用气象研究所北京100029

受全球持续暖化影响, 北极近地表气温急剧升高.基于1940—2022年ECMWF ERA5逐月再分析资料分析研究北极夏冬季2 m气温变化及可能驱动机制.1940—2022年北极夏冬季2 m气温主要呈偶极型和一致型模态, 均为突变现象.冬季增温趋势相比夏季... 详细信息

受全球持续暖化影响, 北极近地表气温急剧升高.基于1940—2022年ECMWF ERA5逐月再分析资料分析研究北极夏冬季2 m气温变化及可能驱动机制.1940—2022年北极夏冬季2 m气温主要呈偶极型和一致型模态, 均为突变现象.冬季增温趋势相比夏季更显著, 对"北极放大"效应作用更大, 特别是83°N向南至北地群岛、90°E向西至斯瓦尔巴群岛区域, 增温幅度接近于北极其他增温区域的2倍以上, 可认为是"北极放大"效应的最敏感区.通过对突变前后地表能量收支分析, 夏季2 m气温突变前后变化主要由地表储热、地表反照率反馈和晴空长波辐射变化主导, 冬季2 m气温突变前后变化主要由晴空长波辐射、地表储热和湍流热通量变化主导.此外, 研究还发现, BO型模态在冬季2 m气温突变后纬向逐步加强显著促进北极冬季2 m气温变暖, 北太平洋PDO/北大西洋三极子共同作用也显著促进了北极冬季2 m气温的突变, 使其变暖更加明显.而大气环流和海温调制对夏季2 m气温的突变贡献均较小, 且不显著.

关键词：北极增温敏感区驱动机制大气环流海温调制

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The Disastrous 23 July 2009 Debris Flow in Xiangshui Gully, Kangding County, Southwestern China

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Journal of Mountain Science 2011年第2期8卷 131-139页

作者： TAng Chuan y.ng y.nghong su y.ngchao DIng Jun HUAng Wenjie State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China

On 23 July 2009, a catastrophic debris flows were triggered by heavy rainfall in Xiangshui gully, Kangding county, southwestern China. This debris flow originating shortly after a rainstorm with an intensity of 28 mm per hour transported a total volume of more than 480×103 m3 debris, depositing the poorly sorted sediment including boulders up to 2-3 m in diameter both onto an existing debris fans and into the river. Our primary objective for this study was to analyze the characteristics of the triggering rainfall and the debris supply conditions, and to estimate debris-flow volume, mean velocity, and discharge. A comparison with adjacent rain-gage records indicates that debris flows in this setting can be produced in response to as little as 17 mm/hour or 3.5 mm/10-minute of rainfall intensity with relatively lower amount of cumulative antecedent rainfall. The field measurement and the interpretation of the Worldview image indicate that abundant landslides occurred on steep slopes within areas underlain by highly weathered granite. Using empirical equations that combine flow depth and channel slope, the mean velocity and discharge of the debris flow were estimated to be 9.2 m/s and 2150 m3/s, respectively. The results contribute to a better understanding of the conditions leading to catastrophic debris flows.

关键词： Debris flow Rainfall intensity Debris supply Deposition Velocity China

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Numerical simulation of irregular section underground structure shaking table test model

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Earthquake Research Advances 2022年第4期2卷 53-59页

作者： Baizan Tang Wenchao Deng su Chen Xiaojun Li Haiy.ng Zhuang State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure East China Jiaotong UniversityNanchang330013China Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin150086China Faculty of Architecture Civil and Transportation EngineeringBeijing University of TechnologyBeijing100124China

Based on the the large shaking table test results on irregular section subway station structure in soft soil,an overall time-history numerical simulation is conducted to study the nonlinear dynamic interaction of the soilirregular underground *** test results,including the acceleration of the soil,acceleration,and deformation of the structure,were *** consistency between the simulation and test results is verified,and the difference between these results was discussed in *** maximum inter-story drift ratio was approximately 1/472 under input PGA=0.54 *** strain responses of columns were significantly larger than those of the side walls and *** components in the lower layers of the irregular subway station structure,particularly in the central columns,underwent cumulative *** research results could provide a simplified analysis method to quantitatively evaluate the damage of irregular underground structures in soft soil.

关键词： Irregular section subway station Soft soil Seismic response Numerical simulation Shaking table test

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Geometrical and electrical optimization of NS-SDBD streamwise plasma heat knife for aircraft anti-icing

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Chinese Journal of Aeronautics 2023年第2期36卷 87-99页

作者： Zhi su Hua LIAng Haohua ZOng Jun LI Xu FAng Biao WEI Jie CHEN Weiliang KOng Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi'an 710038China Institute of Aero-engine School of Mechanical EngineeringXi'an Jiaotong UniversityXi'an 710049China Northwest Institute of Nuclear Technology Xi'an 710024China The Green Aerotechnics Research Institute Chongqing Jiaotong UniversityChongqing 404100China

Ice accretion on aircraft encountering supercooled water droplets in clouds poses great risks to flight performance and *** the aim of optimizing the newly developed streamwise plasma heat knife method for anti-icing,a parametric investigation is carried out in this *** influence of the detailed voltage profile on the heating effects of a surface Dielectric Barrier Discharge driven by Nanosecond Pulses(NS-SDBD)is investigated,and a comparison of the antiicing performance among different configurations of streamwise plasma heat knife is *** results show that columnar high-temperature regions produced by a multi-streamer discharge appear at small pulse rise time,but become diffuse as the pulse rise time *** optimal pulse rise time exists to provide a wide range and high value of temperature,which is found to be 150 ns for the setup in the present *** influence of the pulse fall time is much weaker than that of the rise *** range and value of the temperature decrease with increasing pulse fall time.A greater pulse width is found to improve the heating effect by increasing the discharge *** a spanwise electrode is placed connecting the streamwise electrodes of the streamwise plasma heat knife at the airfoil leading edge,the anti-icing performance becomes poorer,whereas good performance is achieved when the spanwise electrode is at the edge of the streamwise *** on this,a three-level configuration of the plasma heat knife is proposed,and its anti-icing performance is found to be much better than that of the original configuration.

关键词： Airfoil icing mitigation Dielectric barrier discharge Nanosecond pulse Voltage profile Plasma

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Effect of quenching residual stress on precipitation behaviour of 7085 aluminium alloy

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Journal of Materials Science & Technology 2023年第1期132卷 154-165页

作者： Jin Liu Zhiy.ng Du Jinlong su Jie Tang Fulin Jiang Dingfa Fu Jie Teng Hui Zhang College of Materials Science and Engineering Hunan UniversityChangsha 410082China

The quenching-induced residual stress in ultrahigh strength Al-Zn-Mg-Cu alloys has a great influence on their precipitation behaviour in subsequent heat treatment and the properties of the final *** the present work,the cladding quenching method was employed for 7085 Al alloy slabs to tailor different quenching residual *** the effects of quenching residual stress on the precipitation behaviour of the 7085 Al alloy were investigated through finite element analysis,residual stress and hardness distri-bution measurements and microstructural *** results indicate that the reduction in resid-ual stress increases with increasing cladding layer *** a cladding layer thickness in the range of 1-1.4 mm,the residual stress is almost *** hardness at the surface of the aged sample with a large compressive residual stress is decreased,while the hardness at the centre of the sample with a large tensile residual stress is *** hardness is approximately identical between the aged sam-ples with little or no residual *** elastic lattice distortion caused by residual stress is found to promote the nucleation of precipitates during the artificial ageing *** in-depth mechanisms for the effect of quenching residual stress on the precipitation of 7085 Al alloy are also discussed.

关键词： Aluminium alloy Quenching Residual stress Precipitation Finite element method

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Differences between triggered lightning striking to ground and distribution line inferred from measured currents and electromagnetic fields

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High Voltage 2022年第4期7卷 705-717页

作者： Li Cai Qiang Hu Jianguo Wang Mi Zhou Quanxin Li Rui su yijun Huang School of Electrical Engineering and Automation Wuhan UniversityWuhanChina

In 2018-2019,two types of rocket-triggered lightning tests,that is,striking to ground and distribution line,were conducted in Guangdong,*** main focus of this paper is to compare the waveform parameters of the return strokes(RS)from the two *** current,the 10%-90%risetime of RS from lightning striking to distribution line is 2.4 times higher than that striking to ground,and the differences in the other parameters are *** close magnetic field,the RS from lightning striking to distribution line have a lower peak(30%lower after considering the peak current)and a larger risetime and half-peak width time;besides,it is necessary to divide the front edge of the close magnetic field waveform into two parts:leader(BL)and return stroke(BRS).For close electric field,the close RS electric field peak(ERS)was less sensitive to distance than the leader electric field peak(EL).For far electric field,the differences in waveform parameters of RS from the two tests were not significant,but after considering the peak current,the normalised initial electric field peak(EP)of RS from lightning striking to distribution line was 14%lower than that striking to ground.

关键词： distribution striking lightning

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