搜索结果: 1-15 共查到“工学 Infiltration”相关记录19条 . 查询时间(0.093 秒)
Surface irrigation management in relation to water infiltration and distribution in soils
grape yield infiltration parameters irrigation evaluation linear distribution soil water storage surface irrigation (furrow/border) water use efficiency
2015/3/2
Water infiltration and storage under surface irrigation are evaluated, based on the initial soil water content and inflow rate as well as on the irrigation parameters and efficiencies. For that purpos...
淡水与微咸水入渗特性对比分析(Infiltration Characteristic Contrast Analysis of Fresh Water and Saline Water)
微咸水 淡水 间歇入渗 连续入渗
2010/12/29
为了研究淡水与微咸水连续和间歇入渗特性的差异,采用矿化度1.33g/L的淡水与矿化度3g/L的微咸水,在黏质土壤条件下进行了一维积水连续入渗及间歇入渗试验。研究结果表明,采用微咸水入渗可以改变土壤的结构特性,从而增大土壤的入渗能力;利用一维代数入渗模型对试验资料进行处理,结果表明模型可以比较精确地描述微咸水入渗过程;入渗水为淡水时,间歇入渗减渗,而入渗水为微咸水时,间歇入渗增渗;间歇入渗的循环...
不同初始含水率条件下的微咸水入渗实验(Saline Water Infiltration with Different Initial Moisture Contents)
微咸水 初始含水率 累积入渗量 湿润锋
2010/12/29
针对矿化度均为3g/L的微咸水入渗时,土壤初始含水率对土壤入渗过程的影响,采用室内均匀土柱一维垂直入渗实验方法,分别对初始含水率为2.25%、8.18%、13.12%、16.40%的土柱入渗过程进行了研究。分析了不同土壤初始含水率对累积入渗量和湿润锋推进深度以及土柱剖面含水率的影响。采用Kostiakov模型对累积入渗量和时间的关系进行了拟合,结果表明累积入渗量与初始含水率呈负相关关系。采用幂函...
非充分供水与充分供水入渗模型参数间关系试验(Experiment on Relations of Infiltration Model Parameter in Non-sufficient and Sufficient Water Supplies)
非充分供水 充分供水 Kostiakov三参数模型
2010/12/29
基于均质土壤的非充分供水与充分供水入渗试验数据,分析了非充分与充分供水入渗过程之间的关系,建立了非充分与充分供水入渗Kostiakov三参数模型参数之间的关系。结果表明:非充分供水积水后入渗过程以充分供水入渗过程为渐近线;非充分与充分供水入渗参数α的比值m随着供水强度的增加而增大、随着黏粒含量的增加而增加、随着砂粒含量的增加而减小、随着土干密度的增加而增加、随着初始含水率的增加而减小,它们之间都较...
入渗水矿化度对土壤入渗特征和离子迁移特性的影响(Effect on Both Soil Infiltration Characteristics and Ion Mobility Features by Mineralization Degree of Infiltration Water)
地下水 积水入渗 矿化度
2010/12/28
为开发利用浅层地下劣质水,进行均匀土柱一维垂直入渗实验,对矿化度不同的入渗水在土柱中入渗后的剖面含水率分布和土壤入渗率进行了分析,并对土壤剖面的含盐量以及入渗后盐分降低区深度随入渗水矿化度的变化规律进行了研究。结果表明,含盐水入渗能够改变土壤结构,并增强土壤导水和持水能力,但随着进入土壤中的钠离子数量增加,土壤的导水和持水能力并非由矿化度一个因素决定,而是由入渗水矿化度和钠离子数量共同决定。当矿化...
微咸水入渗水量对土壤水盐运移特征的影响(Effect on Characteristics of Soil Water and Salt Movement about Saline Water Infiltration with Different Infiltration Amount)
微咸水 含水率 含盐量 脱盐效率
2010/12/28
通过室内3g/L微咸水的入渗试验,分析了不同微咸水入渗水量对土壤剖面含水率、含盐量、脱盐效率和阳离子分布的影响。结果表明,利用3g/L的微咸水进行垂直一维积水入渗,入渗水量较小时,基质势是水分运动的主要动力,入渗量继续增大时,重力势逐渐取代基质势成为水分运动的主要动力;采用3g/L的微咸水入渗,可以使上层土壤脱盐,但使湿润锋处的含盐量急剧增加且达到最大值;湿润锋处含盐量与入渗水量符合指数函数...
植物混掺物对甘肃景泰砂壤土入渗过程的影响(Impacts of Plant Additive on the Infiltration with Sandy Loam)
土壤水扩散率 入渗速率 湿润锋
2010/1/28
通过室内试验,研究了不同混掺物及不同混掺比例对土壤水分入渗特性及湿润体含水量分布规律的影响。结果表明:指数函数能较好地描述含有混掺物的土壤水扩散率;添加一定比例混掺物的土体能有效延长水分对耕层土壤的湿润,增大水分在耕层的滞留时间;混掺3%玉米叶处理和1%玉米叶处理能够有效提高耕层土壤含水量。
Development of textile-reinforced carbon fibre aluminium composites manufactured with gas pressure infiltration methods
Composites Carbon fibre-reinforced aluminium Pressure infiltration
2009/12/14
Purpose: The aim of his paper is to show potential of textile-reinforced carbon fibre aluminium composite with advantage of the lightweight construction of structural components subjected to thermo-me...
Aluminium matrix composites fabricated by infiltration method
Composites Ceramic preforms Infiltration
2009/12/3
Purpose: The aim of this work is to examine the structure and properties of metal matrix composites obtained by infiltration method of porous ceramic preforms by liquid aluminium alloy.
Design/method...
The analysis of strength properties of ceramic preforms for infiltration process
Porous ceramics Si3N4 Alumina carbonitride
2009/12/2
Purpose: The goal of this work is the optimization of sintering process of the ceramic preforms based on Si3N4 and Al2O3-Ti(C,N) materials. The influence of pore forming additives on porosity, microst...
Nitride and carbide preforms for infiltration process
Porous ceramics Non-oxide preforms Si3N4
2009/12/1
Purpose: Infiltration of molten metals into porous ceramic preforms is the only technique suitable for the
fabrication of high volume fraction of ceramic materials in MMCs. The most popular materia...
膜孔灌平均入渗水深简化计算模型建立与验证(Simplified Infiltration Model of Film Hole Irrigation and Its Validation)
膜孔灌 入渗速率 膜孔直径
2009/9/11
以非饱和土壤水分运动理论为基础,研究了膜孔灌土壤水分运动的数学模型,并用SWMS—3D软件对多种典型土壤的膜孔灌入渗特性进行模拟,利用模拟结果分析了膜孔灌入渗特性及其影响因素,提出了包含开孔率、膜孔直径的膜孔灌点源平均入渗水深简化模型。采用多种土壤膜孔灌入渗室内试验结果与已有文献资料对所建模型进行验证,结果表明所建模型能较准确地反映膜孔灌点源入渗特性,可为确定合理的膜孔灌灌水技术要素组合提供理论依...
畦田Philip入渗参数和田面综合糙率同步推求(Synchronously Determining Philip Infiltration Parameter and Synthesis Roughness Model of Border Irrigation)
畦灌 土壤入渗参数 田面综合糙率
2009/8/11
以水量平衡原理为基础,通过对畦灌地表水面线的概化,并将Philip入渗公式等同为α=0.5的Kostiakov修正模型,由此建立了利用畦灌水流推进过程同步推求Philip土壤入渗参数和田面综合糙率的模型。结合文献资料和大田试验对所建模型进行验证,并采用Matlab软件求解,得出不同地表储水形状系数σh下的入渗参数和糙率,并分别对入渗参数和田面综合糙率的可靠性进行了验证,结果表明所建模型同步推求土壤...
Field-Measured Furrow Infiltration Functions
Infiltration functions Infiltration Furrow irrigation
2009/1/13
Furrow infiltration varies with different variables and is a complex process for modeling infiltration over the field. This research was conducted to develop empirical relationships between field-wide...
Influence of Postharvest Vacuum Infiltration with Calcium on Chilling Injury, Firmness and Quality of Lisbon Lemon Fruit
Chilling injury quality parameters postharvest treatments CaCl2 Lisbon lemon
2008/11/1
The aim of present study to determine the effect of postharvest vacuum infiltration with CaCl2 on Chilling injury, firmness and quality of Lisbon lemons [Citrus limon (L.) Burm.] at the yellow-green s...