检索结果-南通市图书馆

Influence of soil texture on the process of subsurface drainage in saturated-unsaturated zones

International Journal of Agricultural and Biological Engineering 2021年第1期14卷 82-89页

作者： Yufang li mingsi li Hongguang liu Wenbao Qin College of Water Resources and Architectural Engineering Shihezi UniversityShihezi 832000XinjiangChina Santunhe River Basin Management Section Changji Water Resources BureauChangji 831100XinjiangChina

This study addressed the problem of low drainage efficiency or even no drainage in subsurface drainage systems buried in saturated-unsaturated zones above the water table.An indoor experiment on infiltration under ponded conditions in a homogeneous soil column was performed to study the effects of soil texture on the soil wetting front morphology,soil infiltration rate,drainage efficiency of the subsurface drainage pipe,vertical distribution of soil water content and salinity along the soil column.The results showed that the drainage process of subsurface drainage pipes above the water table was quite different from that of subsurface drainage pipes below the water table.When a subsurface drainage pipe was located in sandy soil,the migration of soil water toward the bottom of the drainage pipe was significant,and the water could not be discharged into the pipe.When the drainage pipe was located in loamy clay,the movement of soil water towards the bottom of the pipe was retarded,and the water could be discharged into the pipe.During the drainage process,the drainage of the pipe can produce nonequilibrium flow in the soil,and the continuity of the nonequilibrium flow can be affected by the hydraulic conductivity of the soil above the pipe,which can result in discontinuous drainage and low drainage efficiency.The water holding capacity,permeability and aeration of soil are important factors that affect the drainage under unsaturated conditions.Eliminating the hysteresis effect and capillary barrier around the drainage pipe and adjusting water holding capacity,the permeability and aeration of soil structure through a new subsurface drainage structure may enhance the drainage efficiency of subsurface drainage pipes in saturated-unsaturated zones.

关键词： saturated-unsaturated zone soil texture subsurface drainage pipe groundwater level

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Response of spatial structure of cotton root to soil-wetting patterns under mulched drip irrigation

引用

International Journal of Agricultural and Biological Engineering 2020年第5期13卷 153-162页

作者： Dongwei li mingsi li Xiaojun Shen Xinguo Zhou Hao Sun Yulong Zhao Wenjuan Chen College of Water Conservancy and Architecture Engineering Shihezi UniversityShihezi 832000XinjiangChina Farmland Irrigation Research Institute Chinese Academy of Agricultural SciencesXinxiang 453002HenanChina

The matching relationship between the spatial structure of cotton cluster root systems and soil-wetting patterns under mulched drip irrigation forms the theoretical basis for the technical design of mulched drip irrigation.A 2-year field experiment was conducted,in which different soil-wetting patterns were produced by setting different emitter discharge rates.The envelopes of cotton cluster root length densities were derived using the topological methodology and used to examine the effects of different soil-wetting patterns on the spatial structure of root systems and water uptake capacity within row spaces.The results showed that the root systems in rows of cotton grown under narrower and deeper soil-wetting patterns exhibited a single-peak distribution,while those under wider and shallower soil-wetting patterns exhibited a two-peak distribution.Furthermore,cotton rows grown near mulch edges experienced lower moisture stress,and wider and shallower soil-wetting patterns contributed to greater root growth rates in the vertical direction and resulted in more even potential water uptake capacities.The findings of this study revealed that wider and shallower soil-wetting patterns were more desirable for mulched drip irrigation of cotton and should be considered in the technical design of drip irrigation systems.

关键词： mulched drip irrigation soil-wetting pattern envelopes of cotton cluster root length densities soil matrix suction potential root water uptake capacity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

滴灌条件下种植密度对盐地碱蓬生长及移盐量的影响

引用

中国草地学报 2024年第3期46卷 91-99页

作者：徐强刘洪光李明思李鹏飞李玲徐亦彬张茜石河子大学水利建筑工程学院新疆石河子832000 现代节水灌溉兵团重点实验室新疆石河子832000

为了研究滴灌条件下盐地碱蓬的生长和移盐能力对不同种植密度的响应,在新疆喀什地区分别设置D1(10株/m^(2))、D2(20株/m^(2))、D3(30株/m^(2))、D4(40株/m^(2))、D5(50株/m^(2))、D6(60株/m^(2))共6种种植密度进行大田试验,以期通过控... 详细信息

为了研究滴灌条件下盐地碱蓬的生长和移盐能力对不同种植密度的响应,在新疆喀什地区分别设置D1(10株/m^(2))、D2(20株/m^(2))、D3(30株/m^(2))、D4(40株/m^(2))、D5(50株/m^(2))、D6(60株/m^(2))共6种种植密度进行大田试验,以期通过控制种植密度调控盐地碱蓬株型,达到高产、高效的目的。结果表明:滴灌条件下,种植密度对盐地碱蓬的生长影响显著,随着种植密度增大,株高先增高后降低,蓬径与茎粗逐渐减小;盐地碱蓬生物量随着密度的增大先提高后降低,呈二次曲线趋势,D3处理的生物量最大,较其他处理提高了7.45%~63.85%,同时,D3处理的移盐量最高,达5931.21 kg/hm^(2),较其他处理高12.49%~59.97%;D3与D4处理水分生产效率相近,分别为6.31、6.14 kg/m3;D3处理水分移盐效率最高,达1.58 kg/m^(3),D4处理次之,为1.41 kg/m^(3)。本研究表明可通过控制种植密度调控盐地碱蓬生长指标,优化株型,进而影响盐地碱蓬的产量与移盐能力,滴灌条件下种植盐地碱蓬应采取30~40株/m^(2)的稀植密度。

关键词：盐渍土盐地碱蓬滴灌移盐能力密度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

准噶尔盆地荒漠-绿洲过渡带梭梭单株水分生长函数

引用

干旱区资源与环境 2024年第2期38卷 132-141页

作者：柳幸爽杨海梅李明思许翼飞常玉荣石河子大学水利建筑工程学院石河子832000

为了探究准噶尔盆地荒漠-绿洲过渡带梭梭的水分生长规律、确定梭梭的生长耗水下限,在野外对6种土壤水分环境下的梭梭耗水和枝条生长过程进行了为期2年的定点观测和研究。结果表明:1)6、7月份的降水量对梭梭的耗水量和枝条的生长状况有... 详细信息

为了探究准噶尔盆地荒漠-绿洲过渡带梭梭的水分生长规律、确定梭梭的生长耗水下限,在野外对6种土壤水分环境下的梭梭耗水和枝条生长过程进行了为期2年的定点观测和研究。结果表明:1)6、7月份的降水量对梭梭的耗水量和枝条的生长状况有显著影响。梭梭在不同降水年份的6、7月份日均耗水量的变化幅度大于0.07mm/d,枝条生长速度的变化幅度大于0.03cm/d;而在5月份和8月份日均耗水量的变化幅度低于0.06mm/d,枝条生长速度的变化幅度低于0.02cm/d。2)在选取的5种数学模型中,Hossfeld模型拟合效果较好,模型结构稳定,可以反映出梭梭在水分胁迫条件下的生长规律。3)荒漠-绿洲过渡带的梭梭在非水分胁迫下生长时,其耗水量下限为97.65mm,而保证梭梭生存的最低耗水量为59.80±1.37mm。研究结果可为确定准噶尔盆地荒漠-绿洲过渡带梭梭林的生态需水量提供参考和理论依据。

关键词：梭梭耗水量枝条的生长速度水分生长函数

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparative investigation on soil salinity leaching under subsurface drainage and ditch drainage in Xinjiang arid region

引用

International Journal of Agricultural and Biological Engineering 2016年第6期9卷 109-118页

作者： He Xinlin liu Hongguang Ye Jianwei Yang Guang li mingsi Gong Ping Aernaguli Aimaiti Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production&Construction Group Shihezi UniversityShihezi 832000XinjiangChina

This study was carried out to explore the effects of leaching salinity under subsurface drainage and mulched drip irrigation on saline and alkaline land from the year 2012 to 2014 in Xinjiang Region of China.Three sampled points were both set up in the subsurface drainage and ditch drainage areas.Soil samples were obtained at varied depths.Through observing the underground water table under each sampled point and measuring the electrical conductivity(EC)of the soil extracts,the following results were obtained:(1)after draining,the underground water table ranged from 1.6 m to 2.2 m in the ditch drainage area,and ranged from 1.5 m to 2.2 m in the subsurface drainage area.Thus,both irrigations could control underground water table below 1.5 m which is deeper than the main water-absorbing layers of crop root systems;(2)for subsurface drainage,the closer to the pipe,the better to leach salinity;decreased from the initial 13.54-22.95 g/kg to 8.20-11.47 g/kg;(3)compared with the amounts in 2012,soil total salt at each sampling point at depths of 0-200 cm in subsurface drainage area decreased by 42.99%,36.84%and 24.41%respectively in 2014;and in ditch drainage area decreased by 46.85%,38.12%and 30.80%respectively in 2014.The results showed both ditch and subsurface drainage could leach salinity effectively.

关键词： mulched drip irrigation soil salinity subsurface drainage ditch drainage

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Leaching kinetics of fluorine during the aluminum removal from spent li-ion battery cathode materials

引用

Journal of Environmental Sciences 2024年第4期138卷 312-325页

作者： Shengjie li Jianxin Zhu Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

The high content of aluminum(Al)impurity in the recycled cathode powder seriously affects the extraction efficiency of Nickel,Cobalt,Manganese,and lithium resources and the actual commercial value of recycled materials,so Al removal is crucially important to conform to the industrial standard of spent li-ion battery cathode materials.In this work,we systematically investigated the leaching process and optimum conditions associated with Al removal from the cathode powder materials collected in a wet cathode-powder peeling and recycling production line of spent li-ion batteries(liBs).Moreover,we specifically studied the leaching of fluorine(F)synergistically happened along with the removal process of Al,which was not concerned about in other studies,but one of the key factors affecting pollution prevention in the recovery process.The mechanism of the whole process including the leaching of Al and F from the cathode powder was indicated by using NMR,FTIR,and XPS,and a defluoridation process was preliminarily investigated in this study.The leaching kinetics of Al could be successfully described by the shrinking core model,controlled by the diffusion process and the activation energy was 11.14 kJ/mol.While,the leaching of F was attributed to the dissolution of liPF6and decomposition of PVDF,and the kinetics associated was described by Avrami model.The interaction of Al and F is advantageous to realize the defluoridation to some degree.It is expected that our investigation will provide theoretical support for the large-scale recycling of spent liBs.

关键词： Al removal F leaching Cathode powder Heating alkali leaching Leaching kinetics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

覆膜滴灌条件下的土壤盐分表聚特征研究

引用

灌溉排水学报 2022年第9期41卷 93-100页

作者：陈文娟李明思李清林李东伟石河子大学理学院新疆石河子832000 石河子大学水利建筑工程学院新疆石河子832000

【目的】探究新疆地区覆膜滴灌农田膜外土壤盐分表聚特征。【方法】以沙土和壤土为研究对象,通过室内试验,对2种质地的土壤分别进行了高蒸发强度和低蒸发强度处理,观测了覆膜滴灌条件下土壤盐分的水平分布和垂直分布;不同温度处理下,对... 详细信息

【目的】探究新疆地区覆膜滴灌农田膜外土壤盐分表聚特征。【方法】以沙土和壤土为研究对象,通过室内试验,对2种质地的土壤分别进行了高蒸发强度和低蒸发强度处理,观测了覆膜滴灌条件下土壤盐分的水平分布和垂直分布;不同温度处理下,对2种质地的土壤进行了盐分表聚发展过程试验。【结果】覆膜滴灌条件下,2种土质的表层含盐量随距滴头水平距离呈指数函数分布;膜外土壤垂直剖面上的含盐量呈“Γ”型分布,盐分主要聚集在表层土壤中。其中,高蒸发强度处理下,沙土表层(0~2cm)的平均含盐量是2cm以下土层平均含盐量的7.3倍,壤土表层(0~2cm)的平均含盐量是2cm以下土层平均含盐量的8.4倍;低蒸发强度处理下,沙土和壤土的对应数值分别是7.2倍和7.9倍。影响土壤盐分表聚的主要因素是土壤水分的蒸发速率;土壤含水率、环境温度和蒸发强度的提高都可以增大土壤水分蒸发速率,导致土壤表面盐分聚集量增加,其中,土壤含水率所起的作用最大。土壤水分对盐分的溶解度随含水率的降低而下降,导致蒸发过程中盐分表聚速率存在峰值,而且峰值基本与环境温度正相关。【结论】土壤水分汽化散失使盐分从溶液中离析是导致土壤盐分表聚的本质;蒸发作用下,壤土的盐分表聚速率比沙土的盐分表聚速率高。

关键词：覆膜滴灌土质盐分表聚聚集速率

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Additives strategies to improving cycling stability of li metal batteries by modifying electrode electrolyte interphases

引用

Progress in Natural Science:Materials International 2024年第2期34卷 338-344页

作者： Yuan li Pengfei Huang Chunyu Cui Xiaoyuan Ma li Chen Zekun li linhai li Yuhong Tian School of Biological and Chemical Engineering Guangxi University of Science and Technology School of College of Chemistry and Chemical Engineering Hunan University Isky Future Energy Institute

li metal batteries（LMBs） have attracted much attention due to the ultra-high theoretical capacity of the li metal anode（LMA）.However,the uncontrollable dendrites growth and low coulombic efficiency hinder their practical application.Here,we explore 3,5-difluoropyridine（2F-BD） as a novel electrolyte additive to enable highperformance LMBs.The 2F-BD additive participates in and modifies the solvation structure of li ions by reducing the coordinated number of PF6-at the electrode surface,leading to the formation of a liF and li3N-rich solid electrolyte interphase（SEI）.The liF component increases the robustness of SEI and suppresses the formation of li dendrites,while the li3N component facilitates the transportation and reaction kinetics of li ions.As a result,the li‖li symmetric cell presents a stable cycling performance of up to 500 h at a current density of 1 mA cm-2.After coupling with liFePO4cathode,the obtained full cell achieves high specific capacities of 106.06 mA h g-1and 84.98 mA h g-1at 2.55 mA cm-2and 5.10 mA cm-2,respectively,and maintains a high capacity retention of84.0% after 1000 cycles at 0.13 mA cm-2,with an average cycling CE of 99.58%.

关键词： Electrolyte additive li dendrites li metal batteries liF and li3N-Rich electrode-electrolyte interphase liFePO4 cathode

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

生物炭不同施用方式对水盐调控及小麦苗期生长的影响

引用

水土保持学报 2023年第5期37卷 363-369页

作者：徐强刘洪光李明思李鹏飞龚萍石河子大学水利建筑工程学院新疆石河子832000 现代节水灌溉兵团重点实验室新疆石河子832000

为研究生物炭不同应用模式对盐碱土水盐调控及小麦苗期生长的影响。通过室内桶栽模拟试验,生物炭以2种物理状态(粉状和杆状)、3个添加量(1%,3%和5%质量百分比)分别作为覆盖和添加物,以不添加生物炭的处理作为对照。结果表明:“干播湿出... 详细信息

为研究生物炭不同应用模式对盐碱土水盐调控及小麦苗期生长的影响。通过室内桶栽模拟试验,生物炭以2种物理状态(粉状和杆状)、3个添加量(1%,3%和5%质量百分比)分别作为覆盖和添加物,以不添加生物炭的处理作为对照。结果表明:“干播湿出”条件下,FF(粉状覆盖)、GF(杆状覆盖)处理小麦出苗率分别为对照(CK)的7.33~9.00,3.00~3.33倍;FH(粉状混合)、GH(杆状混合)处理的出苗率较CK分别提高66.67%~166.67%,33.00%~367.00%。FF、GF处理的株高大幅提高,较CK分别提高21.52%~34.55%,24.54%~40.48%;FH、GH处理的株高小幅提高,较CK分别提高-1.35%~12.22%,3.76%~8.59%。不同应用模式的灌后含水率差异明显,FF处理的表层土壤较CK提高0.31%~15.58%;而GF处理的表层土壤含水率较CK下降0.40%~7.65%;FH、GH处理的土壤含水率较CK分别提高7.33%~18.61%,1.33%~18.38%;蒸发后FF、GF处理的含水率较CK分别提高4.34%~45.38%,27.08%~53.22%,蒸发后0—15 cm土层的含水率明显提高,FH、GH处理土壤含水率较CK分别提高3.26%~16.66%,5.77%~36.37%。CK 0—10 cm土层的电导率相对变化率最大,为124.76%,FF、GF处理的电导率相对变化率分别为59.61%~114.73%,18.21%~86.47%;GH、FH处理的电导率相对变化率分别为67.26%~96.30%,72.05%~122.32%。FF、GF处理的蒸发量较CK分别减少0.76%~27.21%,53.49%~77.02%;FH、GH处理的蒸发量与CK相比分别减少1.95%~4.79%,1.71%~14.82%。生物炭改良作用的大小取决于生物炭的添加量和应用方式,等炭量投入条件下FF、GF处理在水盐分布、抑制蒸发和作物生长的作用优于FH、GH处理,可作为干旱区添加生物炭改良盐碱地的适宜模式。

关键词：生物炭应用模式水盐分布土壤蒸发小麦

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

滴灌加压泵站离心泵并联总流量分析模型

引用

农业工程学报 2012年第13期28卷 72-76页

作者：李明思蓝明菊吕廷波石河子大学水利建筑工程学院石河子832003

为了在滴灌加压泵站设计中,给并联工作离心泵数量的确定提供帮助,该文以并联水泵工况点的求解原理为基础,建立了分析离心泵并联总流量随并联数量的变化模型。模型分析结果显示,单泵工作流量随并联数量的增多而减小,而且减幅降低;离心泵... 详细信息

为了在滴灌加压泵站设计中,给并联工作离心泵数量的确定提供帮助,该文以并联水泵工况点的求解原理为基础,建立了分析离心泵并联总流量随并联数量的变化模型。模型分析结果显示,单泵工作流量随并联数量的增多而减小,而且减幅降低;离心泵并联总流量随并联数量的增多而增加,但是增幅衰减;而且其衰减速度大于单泵流量减幅的降低速度。利用设计实例验证了该模型的应用有效性。该研究可为滴灌灌区泵站设计提供参考。

关键词：滴灌泵站离心泵流量水泵并联模型

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：