Results 31 to 40 of about 2,555 (148)
Preparation and characteristic of poly(piperazine-amide) hollow fiber composite nanofiltration membrane and the effect of additives [PDF]
, 2015 纳滤膜技术作为现代分离技术的重要手段之一，其分离特性介于超滤膜和反渗透膜之间，独特的分离性能赋予纳滤膜技术在工业领域中广泛应用，尤其是在水处理、脱盐、食品工业、生物医药等方面。有许多的制备纳滤膜的方法，如L-S相转化法、合金共混法、复合法等，其中复合法又分为涂覆法、表面接枝改性法、层层自组装法、界面聚合法，界面聚合法是目前商业化纳滤膜的主要制备方法。 本课题采用界面聚合法，在聚醚砜（PES）中空纤维超滤膜上制备复合纳滤膜，选用制备商业化复合纳滤膜广泛使用的聚合单体哌嗪（PIP）和均苯三甲酰氯（TMC ...
朱奇
core
Sensitive neighborhood range of red sandstone under rheological disturbance condition [PDF]
Under the action of disturbance load, the rheological rock mass in the “sensitive neighborhood” is prone to deformation and failure. In order to study the influence of confining pressure on the range of disturbance “sensitive neighborhood”, the red ...
Bo WANG +7 more
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Shuitu Baochi Xuebao, 2023 为探究大气氮沉降增加导致的土壤团聚体结构变化规律及其对土壤水分入渗性能的影响,在贡嘎山针叶成熟林和中龄林内分别设计2种氮肥形态[(NH4)2SO4、KNO3]和4个浓度水平(0,10,20,40 kg/(hm2·a)N)的添加试验,研究不同形态大气氮沉降对亚高山森林土壤团聚体结构和土壤水分入渗特征的影响。结果表明:(1)随施氮量增加,中龄林土壤大团聚体含量逐渐增加,土壤持水量、孔隙度和水分稳定入渗率逐渐增大;成熟林土壤大团聚体含量、土壤持水量、孔隙度和水分稳定入渗率均表现出先增加后降低的趋势;(2 ...
郭海云, 王根绪, 孙守琴
doaj
Petroleum Exploration and Development, 2011 Targeting the conglomerate reservoir of the Lower Karamay Formation in the Middle District No.6 of Karamay Oilfield, based on the research of conglomerate reservoir characteristics and flow mechanism, laboratory experiments were conducted to study the ...
Xu Changfu +3 more
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Dynamic evolutionary patterns of high-temperature steam seepage and thermal strains of coals during heat injection [PDF]
Background Thermal stimulation of coal seams using high-temperature steam is recognized as a highly promising technology used to increase gas production.
Jinsheng CHEN +6 more
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Shuitu Baochi Xuebao, 2021 根系的存在对土壤大孔隙的产生及渗透特性有着重要影响，为研究浅表层土体中根系生物量与土壤大孔隙特征之间的数值关系，在缙云山针阔混交林中选取杉木单株植物根际土体为研究对象，进行染色示踪试验及根系生物量测量，取样后在室内采用自制定水头装置进行水分穿透试验和渗透试验。结果表明：（1）不同土壤剖面和不同土层深度的土壤染色面积不同，距离树木主干位置越远的剖面染色面积越大，而距离主干位置越近的剖面染色面积越小，且随着土层深度的增加整体上每个剖面上染色面积比均下降；（2 ...
祁子寒 +5 more
doaj
Calculation method of dewatering settlement in saturated loess stratum [PDF]
In the construction of underground engineering with complex surrounding environment, reasonable prediction and evaluation of the influence of precipitation on the surrounding environment is a key problem to control the feasibility of the project.
Guohua DENG +4 more
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Effect of core wettability on seepage characteristics during CO2 saline aquifer sequestration process [PDF]
To clarify the influence of core wettability on the seepage process during the CO2 saline aquifer storage, this paper studies the influence of wettability change in the saline aquifer on the seepage process based on the pore-level seepage model combined ...
Fusheng XUE +4 more
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Shuitu Baochi Xuebao, 2006 利用染色和计算机解译的方法来确定太湖地区3种主要水稻土（白土、黄泥土和乌栅土）的优势流路径和大孔隙的分布状况。将土壤染色后，所拍摄的剖面染色图片经过Photoshop 8．0和ArcGIS8．0处理，将所染的蓝色由深到浅平均分成10个等级，以此分析土壤剖面中大、小孔隙的比例。分析结果表明：（1）3种土壤剖面的优势流深度相差不大，均在80cm左右。但因为乌栅土的地下水位较高（最高可达70cm）。所以优势流对鸟栅土的地下水影响最大。（2）土壤剖面中不同深处的染色百分比与该处土壤容重有显著的相关性 ...
吴华山, 陈效民, 邱琳, 沃飞
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Correlation between soil-water characteristic curve and collapsibility in undisturbed loess [PDF]
This study investigates the correlation between the soil-water characteristic curve (SWCC) of undisturbed loess and its collapsibility. Undisturbed loess soil samples, obtained from depths up to 30 meters below the surface in Chang’an District, Xi’an ...
Haiman WANG +3 more
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