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genome assembly of autotetraploid Actinidia arguta high{1.ghts adaptive evolution and enables dissection of important economic traits

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Plant Communications 2024年第6期5卷 173-192页

作者： Xue-Mei Lu Xiao-Fen Yu Guo-Qiang li Ming-Hao Qu Huan Wang Chuang liu Yu-Ping Man Xiao-Han jiang Mu-Zi li jian Wang Qi-Qi Chen Rui Lei Cheng-Cheng Zhao Yun-Qiu Zhou Zheng-Wang jiang Zuo-Zhou li Shang Zheng Chang Dong Bai-lin Wang Yan-Xiang Sun Hui-Qin Zhang Jie-wei li Quan-Hui Mo Ying Zhang Xin Lou Hai-Xu Peng Ya-Ting Yi He-Xin Wang Xiu-Jun Zhang Yi-Bo Wang Dan Wang li li Qiong Zhang Wen-Xia Wang Yongbo liu Lei gao Jin-Hu Wu Yan-Chang Wang CAS Key laboratory of Plant {1.rmplasm Enhancement and Specialty Agriculture Wuhan Botanical GardenChinese Academy of SciencesWuhanHubeiChina Key laboratory of Western China’s Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhouGansuChina College of {1.fe sciences University of Chinese Academy of SciencesBeijingChina Wuhan Frasergen Bioinformatics Co. LtdWuhanHubeiChina institute of Soil and Ferti{1.zer Anhui Academy of Agricultural SciencesHefeiChina College of Agricultural {1. Xichang UniversityXichangSichuanChina Department of Horticulture Heilongjiang Academy of Agricultural SciencesHarbinHeilongjiangChina College of {1.fe sciences Langfang Normal UniversityLangfangHebeiChina institute of Horticulture Zhejiang Academy of Agricultural SciencesHangzhouZhejiangChina Guangxi institute of Botany Chinese Academy of SciencesGuilinGuangxiChina Xi’an Botanical Garden of Shaanxi Province Institute of Botany of Shaanxi ProvinceXi’anShaanxiChina institute of Modern Agricultural Research Dalian UniversityDalianLiaoningChina Bioinformatics Center College of Plant Science and TechnologyBeijing University of AgricultureBeijingChina College of Agriculture Eastern Liaoning UniversityDandongLiaoningChina Dalian {1. of Chemical Physics Chinese Academy of SciencesDalianLiaoningChina State Environmental Protection Key laboratory of Regional Eco-{1. and Function Assessment Chinese Research Academy of Environmental SciencesBeijingChina Hubei Hongshan laboratory WuhanHubeiChina The New Zealand institute for Plant and Food Research {1.mited AucklandNew Zealand

Actinidia arguta,the most widely distributed Actinidia species and the second cultivated species in the genus,can be distinguished from the currently cultivated Actinidia chinensis on the basis of its small and smooth fruit,rapid softening,and excellent cold *** evolution of tetraploid Actinidia species and the genetic basis of their important agronomic traits are still ***,we generated a chromosome-scale genome assembly of an autotetraploid male *** *** genome assembly was 2.77 Gb in length with a contig N50 of 9.97 Mb and was anchored onto 116 *** and clustering of 101 geographically representative accessions showed that they could be divided into two geographic groups,Southern and Northern,which first diverged 12.9 million years *** underwent two prominent expansions and one demographic bottleneck from the midPleistocene climate transition to the late *** genomics studies using paleoclimate data enabled us to discern the evolution of the species’adaptation to different historical *** genes(AaCEL1,AaPME1,and AaDOF1)related to flesh softening were identified by multi-omics analysis,and their ability to accelerate flesh softening was verified through transient expression assays.A set of genes that characteristically regulate sexual dimorphism located on the sex chromosome(Chr3)or autosomal chromosomes showed biased expression during stamen or carpel *** chromosome-level assembly of the autotetraploid *** genome and the genes related to important agronomic traits will facilitate future functional genomics research and improvement of ***.

关键词： kiwiberry dioecism adaptive evolution paleoclimate geA rapid softening

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Status of aquatic organisms resources and their environments in Yangtze River system(2.1.-2.2.)⋆

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Aquaculture and Fisheries 2024年第5期9卷 833-850页

作者： Haile Yang li Shen Yongfeng He Huiwu Tian Lei gao Jinming Wu Zhigang Mei Nian wei lin Wang Tingbing Zhu Feifei Hu Jinling Gong Hongchun Du Xinbin Duan Huatang Deng Daoqun Wang Fengyue Zhu Yunfeng li Fan Wu Huijun Ru Yan Zhang Junyi li Junlin Yang Yuntao Zhou Dongdong Fang Yinping Wang Danqing lin Yanping Yang Peijie li Silei liu {2. Yang Ping Zhuang Sikai Wang Tao Zhang Gang Yang Wenbo Yang lilai Yuan Kun Cao Shuo Xu Huiyuan liu Zhiqiang liang Chongrui Wang Hong li Xiping Yuan Xin Yang Yilong Fu Yanping Zhang Haixin Zhang Zhiying Tao Sheng Wang Xiaoping gao Binsong Jin Kemao li Guojie Wang Shenglong {2. Yingqin li Chen{2.g Xue Chunyun Lei Shaowei Xue Yi Sun Bin Zhu Ke Shao Xingkun Hu Meihua Xiong Jun Du Bin He Tao Yan Yingying Huang Yuanchao Zou Biwen Xie Yongming Wang Bin li Fei liu Yaoyao Zhang Fei Fan Zhi{2. Wang Jing Huang Haoran Gu Hailong ge Yan Dan Yan li Shuqiao Wang Chuang Zhang Lu Zhou Xue Wang Sheng Zeng Yan Xiang Xugang He {2.hui Qin Chengxing Xia Jie Hou Yifu Shi lifang gao Zhiqiang Zhu Hongbao Shen Yun Du Xuejun Duan Jiawu Xiong Deguo Yang Shaoping liu Zhaohui Ni Hui Zhang Kai liu Feng Zhao Yingren li {2.wei Wang Qiwei wei Yangtze River Fisheries Research institute Chinese Academy of Fishery SciencesWuhan430223China institute of Hydrobiology Chinese Academy of SciencesWuhan430072China Fishery Resource and Environment Research Center Chinese Academy of Fishery SciencesBeijing100141China Key laboratory of Freshwater Fisheries and {1.rmplasm Resources Utilization Ministry of Agriculture and Rural AffairsFreshwater Fisheries Research CenterChinese Academy of Fishery SciencesWuxi214081China East China Sea Fisheries Research institute Chinese Academy of Fishery SciencesShanghai200090China institute of Fisheries {1. Chinese Academy of Fishery SciencesBeijing100141China Hunan Fisheries Science institute Changsha410153China jiangxi Fisheries Research {1. Nanchang330039China Jiujiang {1. of Fishery {2. Jiujiang332000China School of life {1. Nanchang UniversityNanchang330031China Qinghai Provincial Fishery Technology Extension Center Xining810012China Yunnan academy of Fishery {1. Kunming650111China institute of Hydroecology Ministry of Water Resources and Chinese Academy of SciencesWuhan430079China Fisheries institute Sichuan Academy of Agricultural SciencesChengdu611731China School of life {1. Neijiang Normal UniversityNeijiang641100China School of life {1. Southwest UniversityChongqing400715China Chongqing Fishery sciences Research {1. Chongqing401120China Guizhou Fisheries Research institute Guiyang550025China College of Fisheries Huazhong Agricultural UniversityWuhan430072China Hubei Fisheries Science Research institute Wuhan430070China Shaanxi Fisheries Research institute Xi’an710086China Innovation academy for Precision Measurement Science and Technology Chinese Academy of SciencesWuhan430077China Nanjing institute of {1.ography and limnology Chinese Academy of SciencesNanjing210008China Central South Inventory and Planning institute of State Forestry and Grassland Administration Changsha410014China

The Yangtze River is the mother river of *** promote the aquatic ecosystem protection of the great river,the Project of Yangtze Fisheries Resources and Environment Investigation(2.17-2.2.)supported by the Ministry of Agriculture and Rural Affairs,*** carried out by 2. institutes and universities that located in the Yangtze River basin surveys the status of(1)fish species composition and spatial distribution,(2.current fish abundance,(3)endangered fishes,(4)Yangtze finless porpoise,(5)aquatic eco-environments,(6)water-level fluctuation areas,(7)capture fisheries and recreational fisheries of the Yangtze River mainstream and 10 of its main tributaries,including Yalong River,Heng River,Min River(including Dadu River),Chishui River,Tuo River,Jialing River,Wu River,Han River,Dongting Lake and Poyang *** results showed that there were 443 fish species(belonging to 163 genus,37 families,and 18 orders)before 2.17,but only 32. fish species(including 15 new recorded exotic species)were recorded in the project of *** them,Cyprinus carpio,Carassius auratus,Hypophthalmichthys molitrix,Pelteobagrus fulvidraco,Coilia brachygnathus,Silurus asotus,Saurogobio dabryi,Ctenopharyngodon idellus,Pelteobagrus nitidus,Hemiculter leucisculus,Siniperca chuatsi,Coreius heterodon,Culter alburnus,Parabramis pekinensis,and Aristichthys nobilis were the dominant species across the whole Yangtze River *** is estimated that there were 886 million individuals weighing 12..8 million kg,merely equivalent to 2..3%of the resources in 1950s,30.9%of the resources in 1960s,or 58.7%of the resources in *** the new list of protected fishes that recorded in the Yangtze River system,only 15 of 2. were collected in this project of *** gladius has been affirmed to be Extinct by International Union for Conservation of Nature(IUCN).The wild individuals of Tenualosa reevesii and Luciobrama macrocephalus have disappeared for many years and maybe have been extinct

关键词： Fishes Yangtze finless porpoise Resources Aquatic ecosystem Fisheries Background investigation Yangtze river system

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Plant DNA barcoding in China

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Journal of Systematics and Evolution 2011年第03期49卷 165-168页

作者： 1De-Zhu li 2.0}-Quan liU 3Zhi-Duan CHEN 1Hong WANG 4Xue-Jun ge 3Shi-liang ZHOU 1lian-Ming gao 5Cheng-Xin FU 6Shi-lin CHEN 1(Plant germplasm and genomics Centre,germplasm Bank of Wild Species in Southwest China Key {2. of Biodiversity and Biogeography,Kunming institute of Botany,chinese academy of sciences,Kunming 6502.4,China) 2.Key {2. of Arid and Grassland Ecology,College of life sciences,Lanzhou University,Lanzhou 730000,China) 3(State Key {2. of Systematic and Evolutionary Botany,institute of Botany,chinese academy of sciences,beijing 100093,China) 4(Key {2. of Plant Resources Conservation and Sustainable Utilization,South China Botanical Garden,chinese academy of sciences,Guangzhou 510650,China) 5(Key {2. of Conservation Biology for Endangered Wildlife of the Ministry of Education,College of life sciences,Zhejiang University,Hangzhou 310058,China) 6(institute of Medicinal Plant Development,chinese academy of Medical sciences,Peking Union Medical College,beijing 100193,China) (Plant germplasm and genomics Centre Germplasm Bank of Wild Species in Southwest China Key laboratory of Biodiversity and Bio{1.ography Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China) (Key laboratory of Arid and Grassland Ecology College of Life Sciences Lanzhou University Lanzhou 730000 China) (State Key laboratory of Systematic and Evolutionary Botany Institute of Botany Chinese Academy of Sciences Beijing 100093 China) (Key laboratory of Plant Resources Conservation and Sustainable Uti{1.zation South China Botanical Garden Chinese Academy of Sciences Guangzhou 510650 China) (Key laboratory of Conservation Biology for Endan{1.red Wildlife of the Ministry of Education College of Life Sciences Zhejiang University Hangzhou 310058 China) (institute of Medicinal Plant Development Chinese Academy of Medical Sciences Peking Union Medical College Beijing 100193 China) *Correspondence: De-Zhu li *Correspondence: ?Author for correspondence. E-mail: dzl@*** Tel.: 86-871.52.3503 Fax: 86-871.52.7791.

Identification is the keystone of biology(Bell, 1.86).However,to biologists and students of biology, the total numbers of species that must be identified far outnumber the names commonly used in English,{1.,or oth... 详细信息

关键词： DNA Plant DNA barcoding in China matK

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Profiling of MicroRNAs under Wound Treatment in Aquilaria Sinensis by Deep Sequencing to Identify Possible MiRNAs Involved in the Agarwood Formation

Profiling of MicroRNAs under Wound Treatment in Aquilaria Si...

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海峡两岸暨CSNR全国第十届中药及天然药物资源学术研讨会

作者： Zhi-Hui gao~1,jian-He {2.~(1,2.,Zheng Zhang~(1,2., Yun Yang~(2.3),Wen-Ting Zhao~1,Hui Meng~(2.3) (1institute of Medicinal Plant Development,chinese {2. of Medical Science & Peking Union Medicinal College,Malianwabei Road,beijing 100193,China 2.ainan Branch,institute of Medicinal Plant Development,chinese {2. of Medical Sciencee & Peking Union Medicinal College,Wanning 571533,China 3Hainan Provincial Key laboratory of Resources Conservation and Development of Southern Medicine)

Agarwood is a kind of high valued non - timber product a cross A sia,Middle E ast,and Europe. As t he agarwood i s form ed onl y w hen its re source t rees -- the genus Aquilaria are wounded or infected by some m icrobes,overharvesting and habitat loss are t hreatening t he popul ations of a garwood - producing species. Thus,revealing the regulation mechanisms of agarwood formation is critical to promote the production efficiency and protect the wild resource of A quilaria ***(miRNAs) are a group of ge ne expression regulators which have ove rwhelming e ffects on a 1 arge s pectrum of bi ological proc esses.H owever,1 ittle i s known a bout t he ro les of miRNAs i n a garwood form *** t his s tudy,t he s mall RN A hi gh-throughput s equencing a nd 454 transcnptome da ta were adopted to identify miRNAs and monitor their expression under wound treatment in the stems of *** in silico analysis of t he s mall R NA de ep s equencing da ta and t ranscriptome da ta,w e di scovered 1 1 conserved miRNAs,160 novel miRNAs as well as 2.3 homologues miRNAs in *** expression profile of all miRNA families or i ndividual m iRNAs were calculated according t o t heir re ads nu mbers.T he m iR171,m iR390,miR394, miR2.11,and miR3954 families kept the reduced level until 2.days after the treatment examined during the time-course after w ound treatment.131 ho mologious s equences in the 1/2.h l ibrary showed ove r 3-fold variance of r ead num ber compared with the control library.12.of them which exhibited strong expression a lterations w ere further c onfirmed by real-time qua ntitative P *** not onl y s hows t he existence o f m iRNAs i n t his A sian e conomically s ignificant t ree species but also indicated its critical role in stress-induced agarwood *** prediction and annotation of the conserved and novel miRNAs demonstrated binding,metabolic process,catalytic activity,and cellular process were the most common functions of th

关键词： Secondary Metabolism Agarwood MicroRNA Aquilaria sinensis

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铁氧化物“精细还原-非熔态分离”新工艺实验研究

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四川大学学报（工程科学版） 2011年第5期43卷 191-196页

作者：陈培钰高金涛李士琦张颜庭刘润藻张建良北京科技大学冶金与生态工程学院北京100083 天津钢管集团股份有限公司天津300201

基于对现行高炉炼铁-氧气转炉炼钢生产工艺的讨论,提出了"铁氧化物精细还原-非熔态分离"的新工艺。研究中设计、改进了精细还原实验装置,分别设计L1.(2.5)和L4(2.)正交表进行了喀左磁铁矿和某厂炼钢粉尘的精细还原实验以研究微米级铁氧... 详细信息

基于对现行高炉炼铁-氧气转炉炼钢生产工艺的讨论,提出了"铁氧化物精细还原-非熔态分离"的新工艺。研究中设计、改进了精细还原实验装置,分别设计L1.(2.5)和L4(2.)正交表进行了喀左磁铁矿和某厂炼钢粉尘的精细还原实验以研究微米级铁氧化物的还原特性,实验结果表明:在1.000℃以下,使用纯H2.CO对微米级粒度铁氧化物进行精细还原,能实现铁氧化物向金属铁的高度转变。对铁氧化物还原产物解离性、烧结性、铁磁性的研究表明,较低的还原温度使得铁氧化物于非熔化状态下被还原成磁性金属铁,未有烧结现象发生,还原产物中铁元素与杂质元素分别存在,为采用物理方法将铁氧化物精细还原产物中磁性铁元素与杂质元素的进一步分离提供了依据。

关键词：精细还原非熔态分离铁矿粉炼钢粉尘

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基于深度学习的代码生成方法研究进展

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软件学报 2024年第2期35卷 604-628页

作者：杨泽洲陈思榕高翠芸李振昊李戈吕荣聪哈尔滨工业大学(深圳)计算机科学与技术学院广东深圳518055 华为技术有限公司广东深圳518129 北京大学信息科学技术学院北京100871 香港中文大学计算机与工程系中国香港99907

关注根据自然语言描述生成相关代码片段的代码生成(code generation)任务.在软件开发过程中,开发人员常常会面临两种情形.一种是通用功能的实现,需要开发人员编写大量重复且技术含量较低的代码;另一种是依赖于特定任务要求,需要开发人... 详细信息

关注根据自然语言描述生成相关代码片段的代码生成(code generation)任务.在软件开发过程中,开发人员常常会面临两种情形.一种是通用功能的实现,需要开发人员编写大量重复且技术含量较低的代码;另一种是依赖于特定任务要求,需要开发人员查询文档或使用其他工具才能完成的代码编写工作.代码生成作为最直接辅助开发人员完成编码的工作受到学术界和工业界的广泛关注.让机器理解用户需求,自行完成程序编写也一直是软件工程领域重点关注的问题之一.近年来,随着深度学习在软件工程领域任务中的不断发展,尤其是预训练模型的引入使得代码生成任务取得了十分优异的性能.系统梳理当前基于深度学习的代码生成相关工作,并将目前基于深度学习的代码生成方法分为3类:基于代码特征的方法、结合检索的方法以及结合后处理的方法.第1.是指使用深度学习算法利用代码特征进行代码生成的方法,第{1.和第3类方法依托于第1.方法进行改进.依次对每一类方法的已有研究成果进行系统的梳理、分析与总结.除此之外,汇总并分析已有的代码生成工作中常用的语料库与评估方法,以便于后续研究进行实验设计.最后,对代码生成方法研究进展进行总结,并针对未来值得关注的研究方向进行展望.

关键词：代码生成深度学习代码检索后处理机器翻译

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2.2.年夏季广州市一次较长时间O_(3)污染的特征及机理分析

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环境科学学报 2024年第3期44卷 268-277页

作者：黄继章高健何钰清高锐裴成磊宋伟李磊张金谱刘南希葛澳琪余美芳郭昊叶子铭广州市环境保护科学研究院有限公司广州510620 中国环境科学研究院北京100012 广东省广州生态环境监测中心站广州510006 中国科学院广州地球化学研究所广州510630 中山大学大气科学学院珠海519082

2.2.年夏季广州市经历了一次持续时间较长的臭氧污染过程(7月2.日—8月1.).针对此次典型污染事件,本文利用大气常规污染物和挥发性有机物(VOCs)组分数据,以及逐小时气象数据、欧洲中心第5代大气再分析资料(ERA5)等气象数据,对本次污染... 详细信息

2.2.年夏季广州市经历了一次持续时间较长的臭氧污染过程(7月2.日—8月1.).针对此次典型污染事件,本文利用大气常规污染物和挥发性有机物(VOCs)组分数据,以及逐小时气象数据、欧洲中心第5代大气再分析资料(ERA5)等气象数据,对本次污染过程的来源及成因进行了解析,进而研究了天气系统、气象要素及区域传输过程对本次臭氧污染事件的影响.结果表明:在污染期间烷烃和芳香烃对VOCs浓度的贡献最大,工业源及溶剂挥发排放源是造成广州市中心城区污染的重要原因;此外,本次污染过程中广州长时间处于副热带高压控制的下沉气流区,由此产生的局地高温低湿、强辐射等气象条件为臭氧的生成、累积及其污染的持续创造了条件;广州市臭氧分布不仅受本地源的影响,还受区域传输影响;不利气象条件下需要建立区域联防联控机制以减少污染.

关键词：广州臭氧污染过程区域传输

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典型生物可降解塑料热处理特性及动力学

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中国环境科学 2024年第1期44卷 231-241页

作者：高康阮久莉王艺博张建强郭玉文中国环境科学研究院国家环境保护生态工业重点实验室北京100012 西南交通大学地球科学与环境工程学院四川成都610059

为了探究生物可降解塑料在热处理过程中的特性,采用热重分析仪分别在不同升温速率下(1.,2.和30℃/min)对由聚乳酸(PLA)和聚对苯二甲酸-己二酸丁二酯(PBAT)组成的生物可降解塑料(BP1.的失重特性进行分析,BP1.氮气和空气气氛下的反应过... 详细信息

为了探究生物可降解塑料在热处理过程中的特性,采用热重分析仪分别在不同升温速率下(1.,2.和30℃/min)对由聚乳酸(PLA)和聚对苯二甲酸-己二酸丁二酯(PBAT)组成的生物可降解塑料(BP1.的失重特性进行分析,BP1.氮气和空气气氛下的反应过程都非一步完成,主要反应阶段都存在明显的两步失重过程,在氮气和空气气氛下两个主要反应阶段的质量损失率分别达到87.99%~89.64%,84.99%~86.88%,且两反应阶段温度区间存在明显重叠.利用Flynn–Wall–Qzawa(FWO)、Kissin{1.r-Akahira-Sunose(KAS)、Starink三种等转化率法计算动力学参数,得到BP1.氮气气氛下阶段一、阶段二的平均活化能E分别是88.95,90.92.J/mol,空气气氛下阶段一、阶段二的平均活化能E分别是67.2.,91.2.kJ/mol;采用积分主图分析法(Master-plots法)基于1.℃/min确定其动力学反应机理,表明BP1.要反应阶段均符合随机成核和核生长模型(An),但反应级数有所区别,说明氮气和空气不同气氛,并不会影响其反应机理,只是在活性点位的产生和失活速率快慢方面有所区别.

关键词：生物可降解塑料热处理特性动力学等转化率法机理模型

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DETECTING CAVITATION SIGNALS BASED ON ULTRASONIC ACOUSIC EMISSIONS TECHNOLOGYE

DETECTING CAVITATION SIGNALS BASED ON ULTRASONIC ACOUSIC EMI...

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2.1.全国压电和声波理论及器件技术研讨会

作者： jian-xin WANG~1,Mei-li SUI~2.Shi-feng YANG~3,Xian-wei {2.~1 1 Department of Electronic and Information engineering,beijing Electronic Science and Technology {2. beijing City Fengtai District Fufeng Road No.7,Bingjing,100070,China 2.beijing Senior Expert Technology Center chinese academy of sciences beijing City Yuquan Road No.19,Bingjing,100046,China 3 College of Electronic Information and Automation,Tianjin University of Science And Technology Tianjin City Hexi District Dagunan Road No.1038.Tianjin,3002.2.China

This paper presents the experimental analysis on the relationship between Ultrasoinc acoustic emissions (UAEs) and water consumption associated with *** order to avoid background noise interference, the UAEs detecting frequency is between 1.0 KHz and 1.*** the experiments,the hypothesis can be drawn that irrigation conducts when the UAEs reach a certain threshold,which may be beneficial to plant *** a serious water deficit,the excessive transpiration cannot well recover,so there are some UAEs occuring in the night and next morning to lead to the physiological activities ahead of *** ultrasonic acoustic emission event indicates the fracture of water columns in conduits,the several UAEs hits indicate the several elastic deformations of conduits in the process of energy *** signal strength can not only reflect the acoustic emission event,but also reflect the signal energy,which indicates the transpiration pull force and tomato plant water *** is better to use UAEs technique to diagnose the plant water status and carry out automatic and precise irrigation for the plant and to improve the effect of water-saving irrigation.

关键词： water deficit ultrasonic acoustic emissions UAEs

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磷素对含沙水流流体变异特性影响

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水土保持学报 2024年第1期38卷 22-30,39页

作者：张元元高建恩李文证高哲王照润王鹭中国科学院教育部水土保持与生态环境研究中心陕西杨陵712100 中国科学院水利部水土保持研究所陕西杨陵712100 西北农林科技大学水土保持研究所陕西杨陵712100 中国科学院大学北京100101 水利部水土保持生态工程技术研究中心陕西杨陵712100 西北林科技大学水利与建筑工程学院陕西杨陵712100

[目的]为探明磷素对含沙水流流体变异特性的影响。[方法]采用自制双竖管流变仪,研究了磷素对不同浓度含沙水流流体类型、流变参数及流体发生变异的临界阈值的影响。[结果](1.磷素浓度、泥沙浓度及泥沙理化性质是影响含沙水流发生流体变... 详细信息

[目的]为探明磷素对含沙水流流体变异特性的影响。[方法]采用自制双竖管流变仪,研究了磷素对不同浓度含沙水流流体类型、流变参数及流体发生变异的临界阈值的影响。[结果](1.磷素浓度、泥沙浓度及泥沙理化性质是影响含沙水流发生流体变异的主要因素。在2.℃下,过磷酸钙浓度每增加0.1.g/cm^(3),黏滞系数和宾汉极限剪切力分别增加0.48~1.47 mPa·s和3.49~6.84 N/m^(2.。(2.随着磷素和泥沙含量的增大,含磷素的含沙水流由牛顿流体变异为宾汉流体。构建并验证了磷-泥沙水流黏滞系数和宾汉极限剪切力等流变参数的计算模型。(3)给出了磷-泥沙水流流体变异的临界浓度阈值。当磷素浓度从0增加至0.45 g/cm^(3)时,含沙水流的流体变异临界浓度阈值降低49%,说明磷素的存在加速了含沙水流的流体变异。[结论]磷素的增加使得侵蚀水流更容易由牛顿流体变异为宾汉流体,从而影响侵蚀流内部的能量耗散过程,研究结果为深入认识侵蚀污染水流的输移机制提供了新的科学基础。

关键词：流体变异流变模型非牛顿流体磷素污染含沙水流

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