Results 41 to 50 of about 3,262 (152)
Experimental study on porous media penetration based on laser etching technology [PDF]
Permeability plays a pivotal role in water resources management, oil and gas exploration and production, as well as geological hazard assessment. Previous studies primarily explores the influencing factors of permeability through indirect methods, and ...
Huirong GUO +5 more
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Shuitu Baochi Xuebao, 2022 为分析不同梯度盐渍土土壤的物理性质与水动力学性质变异状况,在江苏沿海连云港市徐圩新区开展了试验研究。对5种不同盐渍化级别土壤进行取样,测定其pH、ECe、容重、总孔隙度、含水率和饱和导水率等,分析不同级别滨海盐渍土壤物化特性参数和水动力学性质变化规律。结果表明:(1)不同级别盐渍土0—50 cm剖面土壤ECe先变小后增大,但40—50 cm剖面ECe明显大于0—10 cm剖面。非盐渍土和极重度盐渍土0—50 cm剖面土壤ECe变化较小,轻度盐渍土、中度盐渍土、重度盐渍土的0—50 ...
祝瑜 +6 more
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Shuitu Baochi Xuebao, 2017 为探讨盐渍化土壤在冻融过程中孔隙水及未冻水含量的变化规律，运用核磁共振仪（NMR）测定了不同盐渍土与不同NaCl饱和试样的孔隙水及未冻水含量，同时研究了不同土质对冻结过程中未冻水含量的影响，分析了冻融过程中的滞后现象。试验设置8个处理，即轻度盐渍化粉砂壤土、中度盐渍化壤土2种土壤类型和蒸馏水、0.2%、0.6%、1.0% NaCl 4种溶液。结果表明:（1）在盐渍土冻结过程中，大孔隙降幅速率＞小孔隙降幅速率，而盐渍土的融解先从小孔隙开始。（2）无论是轻度盐渍土还是中度盐渍土，1.0 ...
卢星航 +5 more
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Research of KNN Graph Algorithm Parallelization based on Spark and Its Application [PDF]
, 2016 近些年来，随着计算机科学技术的迅速发展，越来越多的海量数据信息在许多行业中随之产生，海量数据对数据处理的效率提出了极大的挑战。同时在此背景下分布式计算也得到了大力发展，Hadoop使得用户可以进行超大数据集的分析，但是其基于磁盘的MapReduce的计算严重影响了计算性能，而Spark引入RDD(ResilientDistributedDatasets)基于内存计算迎合了广大用户的需求，极大提高了分布式并行计算的效率。虽然在众多大数据工具中，Spark得到了很大的关注，但是Spark还不是十分完善 ...
汪龙宝
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CFD simulation on in-situ ignition of UCG in deep coal seam [PDF]
Underground coal gasification (UCG) as an alternative coal mining technology is attracting much attention. However, due to the high experimental cost of UCG, the evolution mechanism of coal seam should be deeply explored prior to the implement of ...
Can FANG +10 more
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Assessment indicator system for siting of geologic CO2 sequestration in low-porosity and low-permeability saline aquifers: A case study of the Ordos Basin [PDF]
ObjectiveCO2 injection and geologic sequestration in deep saline aquifers as underground spatial resources represents an important means of achieving the targets of greenhouse gas emission reduction and carbon neutrality.
Haofan WANG +6 more
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Zhongshan Daxue xuebao. Yixue kexue ban, 2006 【目的】 通过扫描电镜观察壳聚糖和Ⅰ型胶原在不同温度下以不同比例制备成冻干状组织工程复合支架材料的微观结构, 以获得最佳浓度、比例、温度匹配组合, 制备理想的组织工程复合支架材料。【方法】在- 5 ℃、- 20 ℃和- 80 ℃将不同浓度的壳聚糖、Ⅰ型胶原以及它们不同比例的混合液冷冻 12 h 后冻干 24 h, 扫描电镜观察不同材料表面和内部的微观结构, 并计算其平均孔径和孔隙率。【结果】壳聚糖、Ⅰ型胶原以及它们的混合液冻干后都形成白色海绵状固体, 冷冻温度越低冻干后材料的孔径越小, 孔隙率越低 ...
李容林
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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
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Spontaneous combustion characteristics of hydrothermal eroded coal in deep mining [PDF]
In the process of deep mining, the temperature of mine water is significantly higher than that of shallow coal seams. The erosion of high-temperature hydrothermal fluids affects the physical and chemical characteristics of coal, which in turn affects its
Daimin HU +5 more
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[[alternative]]Mechanism of Microfiltration of Hand to Filter Slurries(II) [PDF]
計畫編號：NSC90-2214-E032-002研究期間：200108~200210研究經費：794,000[[sponsorship ...
黃國楨
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