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Vertical characteristics of the Hani terrace paddyfield ecosystem in Yunnan,China

Frontiers in Biology 2008年第3期3卷 351-359页

作者： Baoshan CUI zheyuan you Min YAO School of Environment Beijing Normal UniversityBeijing 100875China State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing 100875China

The Hani terrace paddyfield in Yunnan Province,China is categorized as a‘constructed wetland’under the Lamsar Convention *** Hani terrace paddyfield ranges from an altitude of 144 to 2000 m above sea level(ASL)in the southern slopes of the Ailao Mountains,angling down at a range of 15°to 75°.In this study,we investigated the ecosystem of the terrace paddyfields in the Mengpin and Quanfuzhuang administrative villages located at the center of the cultural heritage conservation district in the Hani terrace *** Hani terrace paddyfield ecosystem structure is"forest-village-terrace paddyfield-river"in the order of descending *** and water samples were sequen-tially taken from forests,villages and the terrace paddy-fields to be able to study the vertical characteristics of Hani’s terrace ***_(4)-P and NH_(3)-N in water were measured to test for water *** soil nutrient factors were tested,including organic material(OM),char and nitrogen ratio(C/N),pH,total nitrogen(TN),total phosphorus(TP),available phosphorus(AP),and available potassium(AK).Soil quality was also eval-uated using the characteristics of the soil nutrient *** changes in the landscape,wetland types,wetland plants,hydrology and soil nutrients were *** showed that:(1)Hani’s terrace paddyfield can be divided into five types of wetlands;the rice varieties and cultivation patterns vary in each type of wetland.(2)Hani’s terrace paddyfield has a great capacity for water conservation and a strong ability to purify *** impoundage of Hani’s terrace paddyfield is about 5050 m^(3)/hm^(2).Contaminants in the terrace paddyfield soils decrease exponentially with the decline in altitude.(3)Comparison of soil quality in five different land use types indicates decreasing soil quality from forest to terrace land to terrace paddyfield to water *** for headwater soil,single factors such as OM,TN and TP,and the comp

关键词： Hani’s terrace paddyfield wetland landscape wetland types wetland water wetland soil vertical characteristics

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Satellite observations of coastal upwelling in the northern Arafura Sea

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Journal of Oceanology and Limnology 2024年第2期42卷 361-376页

作者： zheyuan YU Zhanjiu HAO Zhenhua XU Peiwen ZHANG Jia you Baoshu YIN Hongwei YANG College of Mathematics and System Science Shandong University of Science and TechnologyQingdao 266590China CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China CAS Engineering Laboratory for Marine Ranching Institute of OceanologyChinese Academy of SciencesQingdao 266071China

Coastal upwelling is significant for marine ecosystems by lifting nutrient-rich deep waters into the euphotic zone,thereby increasing primary and secondary *** satellite observations show that the northern Arafura Sea(NAS),especially in the coastal region,features high chlorophyll-a(chl-a)concentrations,implying a strong coastal ***,coastal upwelling in the NAS has not received much *** on a semi-automatic image processing technology,the seasonal and interannual variability of coastal upwelling in the NAS are investigated in this study using satellite-observed sea surface temperature(SST)and wind *** results suggest that there are seasonal coastal upwelling events in the NAS modulated by upwelling-favorable southeast monsoon(SEM).The annual mean days,mean area,and annual mean intensity of coastal upwelling events during the SEM season are 92 days,6514 km^(2),and-5.31×10^(5),respectively,while the corresponding values during the northwest monsoon(NWM)season are 32 days,5569 km^(2),and-1.41×10^(5).It is also found that the SEM coastal upwelling in the NAS displays prominent interannual *** strong upwelling events are found in 2010,2013,2016,and 2017 when the southeast monsoon winds were *** analysis suggests that at the interannual scale,the upwelling index(UI)averaged in the SEM season is negatively correlated with that of three upwelling *** can be attributed to the limitation of onshore geostrophic flow which is evidenced by the negative correlation between the UI and the alongshore difference in sea surface *** study highlights the important role of the southeast monsoon in the temporal variability of coastal upwelling in the NAS.

关键词： coastal upwelling the northern Arafura Sea southeast monsoon interannual variability

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Transition from grain boundary migration to grain boundary sliding in magnesium bicrystals

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Acta Mechanica Sinica 2024年第8期40卷 17-31页

作者： zheyuan Xing Haidong Fan Chuanlong Xu Guozheng Kang School of Mechanics and Aerospace Engineering Southwest Jiaotong UniversityChengdu610031China Department of Mechanics Sichuan UniversityChengdu610065China

In polycrystalline magnesium(Mg)and Mg alloys,as the grain size decreases,the grain boundary(GB)mediated plasticity including GB sliding and GB migration becomes the dominant deformation *** this study,the motion of[1100]symmetric tilt GBs in Mg bicrystals is investigated using molecular dynamics(MD)*** effects of GB misorientation angle and temperature are *** low/room temperatures and varied GB misorientation angles in the range ofθ≥58.36°,the GB migration occurs via the shear coupling with the invariant plane of{0001};At 35.80°<θ<58.36°,both the GB migration and GB sliding happen and the invariant plane changes from{0001}plane to[1122]plane;At 26.54°≤θ≤35.80°,the GB migrates with the invariant plane of[1122];Finally,atθ<26.54°,the GB sliding becomes the main deformation *** 700 K,the GB sliding occurs at the misorientation angles in the range ofθ<58.36θ;while the GB migration occurs at the misorientation angles ofθ≥58.36°.By comparing the energy barriers of GB migration and GB sliding,it yields that the deformation mode with a low energy barrier always happens,which leads to the transition of deformation modes and agrees well with the MD simulation results.

关键词： Molecular dynamics simulations Magnesium Grain boundary migration Grain boundary sliding Temperature

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Effectiveness of C-Reactive Protein as a Tuberculosis Screening Test Among HIV-Infected Individuals—Shanghai,China,2021-2023

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China CDC weekly 2024年第35期6卷 891-895页

作者： Lixin Rao zheyuan Wu Jing Chen Zhen Ning Xin Shen Shanghai Municipal Center for Disease Control and Prevention ShanghaiChina

Summary What is already known about this topic?The World Health Organization(WHO)has recommended the inclusion of the C-reactive protein(CRP)test in active tuberculosis(ATB)screening algorithms among human immunodeficiency virus(HIV)-infected *** performance of the CRP test in African regions has been *** is added by this report?This study analyzed data from a big data platform of Shanghai medical records together with infectious disease surveillance systems.

关键词： Infect tuberculosis records

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Protective effects of baffles with different positions,row spacings,heights on debris flow impact

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Journal of Mountain Science 2024年第7期21卷 2352-2367页

作者： SUN Xinpo CHEN Min BI Yuzhang ZHENG Lu CHE Chi XU Ao TIAN Zijian JIANG zheyuan College of Civil Engineering Sichuan University of Science and EngineeringZigong 643000China College of Resources and Environment Fujian Agriculture and Forestry UniversityFuzhou 350002China School of Civil Engineering Fuzhou UniversityFuzhou 350108China Jiangsu Key Laboratory of Urban Underground Engineering&Environmental Safety Institute of Geotechnical EngineeringSoutheast UniversityNanjing 210096China Beijing Urban Construction Science Technology Promoting Association Beijing 100055China SUSE-BZ Geoenvironmental Engineering Joint Laboratory Sichuan University of Science and EngineeringZigong 643000China

The baffle effectively slowed down debris flow velocity,reduced its kinetic energy,and significantly shortened the distance of debris flow ***,they are widely used for protection against natural hazards such as landslides and *** study,based on the threedimensional DEM(Discrete Element Method),investigated the impact of different baffle positions on debris flow *** flow velocity and kinetic energy variations were studied through single-factor *** baffle positions were preliminarily selected by analyzing the influence of the first-row baffle position on the impact force and accumulation mass of debris ***,based on the selected baffle positions and four factors influencing the effectiveness of baffle protection(baffle position(P),baffle height(h),row spacing(S_(r)),and angle of transit area(α)),an orthogonal design was employed to further explore the optimal arrangement of *** research results indicate that the use of a baffle structure could effectively slow down the motion velocity of debris flows and dissipate their *** the baffle is placed in the transit area,the impact force on the first-row baffle is greater than that when the baffle is placed in the deposition ***,when the baffle is placed in the transit area,the obstruction effect on debris flow mass is also greater than that when the baffle is placed in the deposition *** orthogonal experimental range analysis,when the impact on the first row of baffles is used as the evaluation criterion,the importance of each influencing factor is ranked asα>P>S_(r)>*** the mass of debris flow behind the baffle is regarded as the evaluation criterion,the rank is changed to P>α>S_(r)>*** experimental simulation results show that the optimal baffle arrangement is:P_(5),S_(r)=16,α=35°,h=9.

关键词： Debris flow Baffle Protective effect Discrete element

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OsbZIP01 Affects Plant Growth and Development by Regulating OsSD1 in Rice

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Rice science 2024年第1期31卷 77-86,I0018,I0019页

作者： DONG Xinli ZHOU Yang ZHANG Yaqi RONG Fuxi DU Jiahong HONG zheyuan HU Peisong LÜYusong College of Agriculture and Biotechnology Zhejiang UniversityHangzhou 310058China State Key Laboratory of Rice Biology and Breeding/China National Center for Rice Improvement China National Rice Research InstituteHangzhou 310006China

As the‘Green Revolution’gene,SD1(encoding GA20ox2),has been widely applied to improve yield in rice ***,research on its transcriptional regulation is ***,we identified a transcription factor OsbZIP01,which can suppress the expression of SD1 and regulate gibberellin(GA)biosynthesis in *** mutants of OsbZIP01 exhibited increased plant height,while the overexpression lines showed a semi-dwarf phenotype and diminished germination ***,the semi-dwarf phenotype of OE-bZIP01,was caused by the reduced internode length,which was accompanied by a thin stem *** predominant expression of OsbZIP01 was observed in leaves and ***01 protein was localized in the nucleus and showed transcriptional repression *** addition,OsbZIP01 could directly bind to the promoter of the OsSD1 gene,and inhibit its *** semi-dwarf phenotype of OE-bZIP01 could be rescued by exogenous GA_(3).Meanwhile,the bzip01 sd1 double mutant showed a shorter shoot length compared with the wild type,indicating that OsbZIP01 regulated plant growth mainly through the GA biosynthesis ***,OsbZIP01 negatively regulates GA biosynthesis by restraining SD1 transcription,thereby affecting plant growth and development.

关键词： OsbZIP01 SD1 gibberellin biosynthesis dwarf and germination

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Innovations and applications of the thermal recovery techniques for heavy oil

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Energy Geoscience 2024年第4期5卷 8-19页

作者： Huanquan Sun Haitao Wang Xulong Cao Qinglin Shu zheyuan Fan Guanghuan Wu Yuanliang Yang Yongchao Wu China Petroleum&Chemical Corporation Beijing100728China Petroleum Exploration and Production Research Institute SINOPECBeijing100083China Shengli Oilfield Company DongyingShandong257001China

Heavy oil represents a vital petroleum resource *** one of the major producers,China is facing great challenges in effective and economic production of heavy oil due to reservoir *** of efforts have been made to promote innovative advances in thermal recovery modes,methods,and processes for heavy oil in the *** thermal recovery mode has been shifted from simple steam injection to a more comprehensive“thermal+"strategy,such as a novel N2-steam hybrid process and CO_(2)-enhanced thermal recovery *** advanced techniques break through the challenges of heavy oil extraction from less accessible reservoirs with thinner oil layers and greater burial *** thermal recovery methods,China has developed the steam-assisted gravity drainage method integrating flooding and drainage(also referred to as the hybrid flooding-drainage SAGD technology)for highly heterogeneous ultra-heavy oil reservoirs and the fire flooding method for nearly depleted heavy oil reservoirs,substantially improving oil ***,a range of processes have been developed for heavy oil production,including the open hole completion process using sand control screens for horizontal wells,the process of integrated injection-recovery with horizontal pump for horizontal wells,the steam dryness maintenance,measurement,and control process,efficient and environment-friendly circulating fluidized bed(CFB)boilers with high steam dryness,the recycling process of produced water,and the thermal recovery process for offshore heavy *** on the advances in methodology,technology,and philosophy,a series of supporting technologies for heavy oil production have been developed,leading to the breakthrough of existing technical limit of heavy oil recovery and the expansion into new exploitation *** the future heavy oil production in China,it is necessary to embrace a green,low-carbon,and energy-efficient development strategy,and to expand heavy oil extr

关键词： Heavy oil Thermal recovery Process technology Hybrid thermal production

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Ultrasound-guided fluid resuscitation versus usual care guided fluid resuscitation in patients with septic shock:a systematic review and meta-analysis

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Emergency and Critical Care Medicine 2024年第2期4卷 82-89页

作者： zheyuan Chen Xiao Han Ying Liu Mengjun Wang Beibei Wang Ling Wang Hongxu Jin Emergency Department General Hospital of Northern Theater CommandShenyangLiaoningChina General Hospital of Northern Theater Command China Medical UniversityShenyangLiaoningChina Center for Cardiac Intensive Care Beijing Anzhen HospitalCapital Medical UniversityBeijingChina

Background:Ultrasound is widely used in critical care for fluid resuscitation in critically ill *** conducted a systematic review to assess the relationship between ultrasound-guided fluid resuscitation strategies and usual care in septic ***:We searched PubMed,Embase,Cochrane Library,Web of Science,and registers for randomized controlled trials to evaluate the prognosis of ultrasound-guided fluid resuscitation in patients with septic ***:Twelve randomized controlled studies with 947 participants were ***-guided fluid resuscitation in patients with septic shock was associated with reduced mortality(risk ratio:0.78;95%confidence interval[CI]:0.65 to 0.94;P=0.007)and 24-hour fluid volume(mean differences[MD]:−1.02;95%CI:−1.28 to−0.75;P<0.001),low heterogeneity(I^(2)=29%,I^(2)=0%),and increased dose of norepinephrine(MD:0.07;95%CI:0.02-0.11;P=0.002)and dobutamine dose(MD:2.2;95%CI:0.35-4.04;P=0.02),with low heterogeneity(I^(2)=45%,I^(2)=0%).There was no reduction in the risk of dobutamine use(risk ratio:1.67;95%CI:0.52 to 5.36;P=0.39;I^(2)=0%).Inferior vena cava-related measures reduced the length of hospital stay(MD:−2.91;95%CI:−5.2 to−0.62;P=0.01;low heterogeneity,I^(2)=8%)and length of intensive care unit stay(MD:−2.77;95%CI:−4.51 to−1.02;P=0.002;low heterogeneity,I^(2)=0%).The use of the passive leg-raising test combined with echocardiography to assess fluid reactivity was ***-guided fluid resuscitation did not significantly change the length of the free intensive care unit stay(MD:1.5;95%CI:−3.81 to 6.81;P=0.58;I^(2)=0%).Conclusion:Ultrasound-guided fluid resuscitation in patients with septic shock is beneficial,especially when using inferior vena cava-related measures and the passive leg-raising test combined with echocardiography.

关键词： Meta-analysis Mortality Resuscitation Septic shock Systematic review Ultrasonography

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高速公路隧道施工对地下水环境的影响分析

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工程技术研究 2020年第23期5卷 20-22页

作者：李阳游哲远重庆高速巫云开建设有限公司重庆401147 招商局生态环保科技有限公司重庆400060

高速公路隧道建设能缩短公路里程,提高运行效率,被大量运用在山区高速公路建设中。但隧道的建设将产生一系列地下水环境问题,主要表现为隧道内涌水及地表枯水两种现象。文章结合具体实例,按照环境影响评价相关要求,对一特长隧道施工期... 详细信息

高速公路隧道建设能缩短公路里程,提高运行效率,被大量运用在山区高速公路建设中。但隧道的建设将产生一系列地下水环境问题,主要表现为隧道内涌水及地表枯水两种现象。文章结合具体实例,按照环境影响评价相关要求,对一特长隧道施工期地下水环境的影响进行评价。评价结果显示,隧道施工对地下水的影响范围为1155m,产生的涌水量为12422m^(3)/d(453.41万m^(3)/年)。在此基础上,文章还针对涌水风险提出了施工期地下水环境的保护措施与建议。

关键词：高速公路隧道地下水涌水

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尾矿库渗滤液对地下水环境影响评价研究——以一电解金属锰项目尾矿库为例

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环境科学与管理 2014年第3期39卷 192-194页

作者：游哲远肖怀德赵珂中冶赛迪重庆环境咨询有限公司重庆400013

金属锰冶炼产生的压滤渣在堆存过程中由于降雨及渣体自带水分产生含高浓度Mn、Cr6+的渗滤液,一旦泄漏,将污染下游地下水。结合具体实例,按照《环境影响评价技术导则地下水环境》要求,对一尾矿库渗滤液泄漏对下游地下水环境特别是生活水... 详细信息

金属锰冶炼产生的压滤渣在堆存过程中由于降雨及渣体自带水分产生含高浓度Mn、Cr6+的渗滤液,一旦泄漏,将污染下游地下水。结合具体实例,按照《环境影响评价技术导则地下水环境》要求,对一尾矿库渗滤液泄漏对下游地下水环境特别是生活水源的影响进行评价,评价结果显示,若发生渗滤液泄漏,将导致下游地下水Mn、Cr6+超标,但不会对生活水井产生直接影响,在此基础上,针对泄漏风险,对尾矿库现有防渗措施进行评价,并进一步提出相应的防范措施。

关键词：尾矿库渗滤液地下水生活水源

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