Results 11 to 20 of about 48,776 (135)
, 2021 建立含裂隙均匀基质中的稳态渗流模型,通过数值模拟得到渗流速度和压力分布,分析不同分布型式的平行和交叉裂隙对基质渗流的影响,并结合油气开采和驱替评价不同裂隙可能带来的后果。研究发现,在裂隙端部压力发生突变,相应的渗流速度也出现急剧变化;对于基质而言,裂隙入口端等同于汇,而开口端等同于源。平行对称分布的裂隙导致周围基质中流速降低,裂隙流量占截面流量的主要部分 ...
乔继延, 鲁晓兵, 张旭辉
core +2 more sources
Shuitu Baochi Xuebao, 2021 裂隙发育降低土体承载力、抗剪强度、凝聚力等力学特性，促使崩壁崩塌。在控制土体厚度（0.8，1.6，2.2 cm）条件下，对崩岗4层土体进行室内脱湿试验，通过相机定时定点拍照，并结合数字图像处理技术分析崩岗土体的裂隙演化特征。结果表明：（1）脱湿过程中土体变形均先产生核心收缩，后产生裂隙，且4层土中过渡层最早产生核心收缩与裂隙发育现象；（2）4层土之间，裂隙发育程度呈现为过渡层>红土层>表土层>砂土层，过渡层与砂土层的较大差异会破坏土体的稳定性，加速崩壁崩塌；（3）随着土体厚度的增加，裂隙发育现象减弱 ...
王娜, 王佳妮, 张晓明, 段晓阳
doaj
, 2009 发展裂隙岩体稳定/非稳定的渗流数值模型,一方面,依照裂隙面的密度、产状、位置、大小和开度的统计分布规律,使用蒙特卡罗模拟技术将完整岩石切割为三维不规则块体集合。根据相邻块体单元间产生的裂隙单元,构建三维裂隙网络系统,并附加各裂隙单元的水力特性;另一方面,对裂隙单元进行三角形单元的有限元网格划分,运用变分原理导出裂隙单元的渗流有限元求解方程。采用离散元方法中的动态松驰技术,在无须组装整体渗透矩阵的情况下求解裂隙网格各结点的水头值。最后 ...
李世海, 张丽, 刘晓宇
core +2 more sources
Shuitu Baochi Xuebao, 2005 黄土中存在大量不同规模、不同成因、不同性质和不同时期的裂隙，不同裂隙之间的互相穿插、切割形成立体的网络裂隙系统。这些裂隙是分割黄土的结构面，是侵蚀土壤、洞穴的优势面，是孕育地质灾害的控制和分离面，是地下水的运移通道和储存场所，对其进行研究具有重要的科学和工程实践意义。本文对黄土裂隙进行了综合分类，系统总结了黄土高原地区自然营力作用下不同黄土裂隙的基本特征和发育规律，认为通常意义的黄土垂直节理主要是由黄土中的一部分不同成因的原生和次后期的垂向裂隙在黄土堆积过程中逐渐“生长”而成的。
卢全中 彭建兵 陈志新 李喜安
doaj +2 more sources
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Lignin hydrogenolysis is a promising route to separable aromatic monomers, yet practical upgrading is still hindered by macromolecular mass‐transfer limitations and the aggregation/deactivation of metal sites. Herein, we propose a “dual‐confinement” strategy to construct ultrafine Ru nanoclusters supported on lignin‐based N‐doped hierarchical ...
Tianjin Li +11 more
wiley +1 more source
World Water Policy, Volume 12, Issue 3, August 2026.ABSTRACT Groundwater depletion is a major challenge in semiarid, hard‐rock regions where irrigation demands often exceed natural recharge. This study evaluates the effectiveness of farm‐scale recharge pits as a local, supplementary, and community‐managed groundwater recharge solution in the Dharta catchment of Rajasthan, India. Alongside check dams and
Prahlad Soni +4 more
wiley +1 more source
Representation of obligate groundwater‐dwelling copepod diversity in European protected areas
Conservation Biology, Volume 40, Issue 3, June 2026.Abstract Groundwaters sustain diverse surface ecosystems and are populated by metazoan species, mostly invertebrates, that provide fundamental ecological functions and are often of prominent conservation value due to narrow endemism and high phylogenetic rarity.
Francesco Cerasoli +7 more
wiley +1 more source
ABCA12 Frameshift Deletion in Domestic Cats With Ichthyosis Fetalis
Veterinary Dermatology, Volume 37, Issue 3, Page 365-374, June 2026.ABSTRACT Background Ichthyosis fetalis (IF), also known as harlequin ichthyosis, is a rare and often fatal autosomal recessive congenital skin disorder. It is characterized by thickened, hard skin plaques and deep skin fissures that limit mobility and cause malformations of the eyes, lips and ears.
Jeanna M. Blake +2 more
wiley +1 more source
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Composite materials hold significant potential for abrasive sealing, yet composite materials used for abrasive sealing fall short in service durability under extreme environments. Here, a controllable strategy for adjusting pore structure is proposed, aiming to design a YSZ(ESP)/BN@ZrO2‐polyester coating with hybrid micron/nanometer ...
Shuang Yu +8 more
wiley +1 more source
, 2015 本发明公开了一种单裂隙非饱和渗流试验系统，包括：常水头供水系统、两块条石、两个垫片、支架和数据采集系统，常水头供水系统用于提供实验用水并保证入水口压力恒定；两块条石叠放在一起，其相对的两个面上粘贴有均匀的沙粒；垫片为细长形状，位于两块条石之间长边的两侧；支架用于固定条石；数据采集系统包括相连的水流位置检测电路和工控机，水流位置检测电路在石缝中设置有多个监测点，工控机监测水流流到各个监测点的时刻，实现石缝内水流位置监测。本发明可通过改变常水头供水系统的水头高度，裂缝厚度、裂隙表面粗糙度等 ...
赵颖 +7 more
core +2 more sources