Results 51 to 60 of about 2,893 (150)
FDEM-CFD coupling analysis of spatiotemporal evolution of mining-induced overburden fracture-water inflow in shallow and thick coal seam under river [PDF]
The distribution of overlying rock fractures and water inflow during mining in shallow and thick coal seams under the river is one of the decisive factors for the safe production of working faces.
Hao LI +3 more
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Shuitu Baochi Xuebao, 2021 为明确土壤干湿交替环境下保水剂与土壤颗粒之间的作用方式及保水剂对土壤结构和水分有效性的影响。通过土柱模拟试验，研究连续失水—复水条件下，不同粒径（>0.85，0.6~0.85，0.30~0.45 mm）保水剂对土壤水分特性、土壤团聚体分布和结构稳定性的作用，以及保水剂—土壤混合体价键结构的微观变化特征。结果表明：第1次（T1）和第2次（T2）失水取样阶段，除T2阶段的最小粒径处理外，其余各粒径保水剂促使土壤相对含水量较对照显著增加72.9%以上 ...
纪冰祎 +5 more
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Macro-meso mechanical properties of gas hydrate bearing coal under triaxial compression with flexible boundary condition [PDF]
To explore the influence of confining pressure on the macro-meso mechanical characteristics of gas hydrate bearing coal (GHBC) under different boundary conditions, the biaxial discrete element tests were carried out subjected to the confining pressures ...
Baoyong ZHANG +5 more
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Shuitu Baochi Xuebao, 2018 为了推进根系固土机制的定量研究，在前期边坡调查和植物筛选的基础上，人工种植了百喜草、假俭草、狗牙根3种常见的护坡植物，根据各深度下原状根-土复合体干密度、含水率和质量含根量等物理性质指标，设计了重塑根-土复合体直剪试验方案，实施了3种植物原状和重塑根-土复合体的直剪试验。结果表明：3种原状根-土复合体的抗剪强度在各级法向压力作用下均随含根量的增加而逐渐增大；3种原状根-土复合体的黏聚力和内摩擦角均随深度的增加而减小；3种植物根系在相同的土体状态下对黏聚力的影响排序为狗牙根＞百喜草＞假俭草 ...
陈 +5 more
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Shuitu Baochi Xuebao, 2023 为探究生物结皮发育驱动下土壤水蚀特征及机理,选取苔藓发育为优势种的退耕样地,设计5个盖度等级(1%~20%,20%~40%,40%~60%,60%~80%,80%~100%),以裸地为对照,在不同水流剪切力(6.12~19.64 Pa)下进行冲刷试验。结果表明:结皮发育显著影响土壤养分含量,且高盖度结皮覆盖下养分表聚效应更加明显。生物结皮发育显著影响土壤分离能力,裸地土壤分离能力为生物结皮的3.58~348.95倍,裸地细沟可蚀性(0.293 5 s/m)为生物结皮(0.001 0~0.082 2 s ...
平原 +6 more
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Introduction of dynamic constitutive model into parallel computing system of strata motion and modeling of impact fracture process of roadway [PDF]
It is theoretically and practically significant to study the dynamic fracture of the roadway surrounding rock under impact for analyzing mechanisms of roadway rockbursts and for predicting and preventing them.
Dong LIU +7 more
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Shuitu Baochi Xuebao, 2017 团聚体的力稳性是决定土壤抗侵蚀能力的关键因素。为探究地带性土壤团聚体抗张强度的变化规律及其影响因素，自北向南选取我国中南部地区6种典型地带性土壤（褐土、黄褐土、棕红壤、红壤、赤红壤和砖红壤）的不同粒径（1~2，2~3，3~5，5~10 mm）团聚体作为研究对象，通过测定团聚体的抗张强度（TS），探究其与土壤基本理化性质的关系，揭示该区域团聚体抗张强度的变化特点和稳定机制。结果表明：（1）供试土壤皆为黏性土壤，自北向南，随着水热条件的增加，土壤的pH值逐渐降低，高岭石含量和游离氧化物（Fed、Ald ...
佘 立 +4 more
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Zhongshan Daxue xuebao. Yixue kexue ban, 2023 目的构建稳定共表达荧光素酶（Luc）和增强型绿色荧光蛋白（EGFP）的人源卵巢癌细胞SKOV3（SK-Luc-EGFP）并探究其在卵巢癌腹腔转移的体内外研究中的应用。方法利用重叠PCR扩增得到的Luc-T2A-EGFP基因片段，构建重组质粒pCDH-Luc-T2A-EGFP-Puro；采用三质粒慢病毒包装系统转染HEK 293T细胞，收集病毒液感染SKOV3细胞；通过嘌呤霉素筛选，流式细胞术检测，筛选高效表达EGFP的细胞（SK-Luc-EGFP），并通过体外生物发光实验验证Luc的表达。对SK-Luc-
万里舟, 杜汝沛, 陈康梅
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Stability analysis of expansive soil landslide based on homogenization theory and upper limit analysis [PDF]
Under the forces of expansive soil and landslides, the construction of the tunnel entrance is more likely to cause engineering disasters, such as surface cracking and landslides. The application of micro piles in the tunnel has advantages over anti slide
Dongqing WANG +3 more
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四君子汤对脾虚大鼠肠黏膜TFF3蛋白表达及TFF3mRNA表达的影响
Zhongguo shiyan zhenduanxue, 2014 目的探讨四君子汤对脾虚大鼠肠道黏膜TFF3蛋白表达及TFF3mRNA表达的影响。方法大鼠随机分为正常对照组、脾虚模型组、自然复健组和四君子汤组,蛋白印迹（Western-Blot）法测定回肠黏膜TFF3蛋白表达的变化,采用逆转录-聚合酶链式反应（RT-PCR）法检测TFF3mRNA。结果与正常对照组相比,脾虚各组大鼠肠黏膜TFF3蛋白表达,TFF3mRNA降低。经四君子汤治疗后,大鼠肠黏膜TFF3蛋白表达,TFF3mRNA明显上调,优于自然复健组 ...
张博, 窦逾常, 王垂杰
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