Results 31 to 40 of about 15,266 (166)
Shuitu Baochi Xuebao, 2016 运用分形模型，结合野外调查和室内试验分析汉中市荒草地整治后耕作层土壤颗粒分形特征，探讨土壤颗粒分形维数与土壤质地、粒径组成以及养分含量的关系，建立整治后耕作层土壤分形维数预测函数。结果表明：（1）整治后土壤颗粒分形维数D介于2.55～2.95之间，均值为2.77，标准差为0.134，土壤颗粒分形维数与土壤质地有一定的关系，表现为土壤质地越细，分形维数越大。（2）土壤颗粒分形维数主要是由黏粒含量决定，分形维数与黏粒含量呈显著线正相关（R2=0.978 0）；利用分形维数与土壤黏粒（≤0.002 mm ...
雷, 韩霁昌
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Pore fractal characteristics of granulated blast furnace slag-carbide slag cementitious material and its effect on heavy metal adsorption [PDF]
Coal has long occupied the main position of energy consumption structure in China. The problem of heavy metal pollution in mine water has become increasingly severe due to washing and processing as well as tunnel development activities.
Jianmin LI, Jiayong ZHANG, Liwen GUO
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Ceramic reinforcement is crucial for crafting ultrastrong and wear‐resistant metallic components. However, pronounced stress concentration and strain incompatibility at ceramic–metal interfaces often trigger microcrack initiation and ceramic spalling exacerbating friction under sliding conditions.
Dongting Li +8 more
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Shuitu Baochi Xuebao, 2007 以8个植被类型、2个农地和2个退耕地的土壤颗粒组成数据为基础，运用分形模型计算这12个土地利用类型土壤颗粒的分形维数，研究了土壤颗粒分形维数与土壤性状的关系。结果表明：（1）12个土地利用类型表层土壤颗粒的分形维数介于2．8185～2．9249之间。与退耕地和玉米地相比，各林地土壤颗粒分形维数小；与1990年的2．8633相比，2006年土壤颗粒分形维数（2．8592）减小；各团聚体分形维数规律不明显。（2）决定土壤颗粒分形维数大小的首先是〈o．002mm的含量，其次是0．05～0．25mm和0 ...
李进峰 +4 more
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Integrative Conservation, Volume 5, Issue 1, Page 137-149, March 2026.Pometia pinnata demonstrated life‐stage‐specific genetic responses to landscape features, with asymmetric gene flow patterns and population recovery following historical bottlenecks, revealing complex topographic and demographic influences on forest genetic structure.
Madhuparna Chatterjee +5 more
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Shuitu Baochi Xuebao, 2008 实现具有三维立体特征的流域地貌分形维数直接准确计算,是目前分形地貌学研究所面临的主要问题之一。依据变分法求解三维表面分形维数的基本原理,以DEM栅格数据为基础,利用ArcGIS9.2中的窗口分析功能,对所建立的小流域模型不同发育阶段的三维地貌闵可夫斯基维数进行研究。结果表明,变分法和GIS的有机结合使三维地貌分形维数的直接计算成为可能,小流域模型不同发育阶段的三维地貌在各自无标度区内呈显著的分形特征,三维地貌闵可夫斯基维数不仅能有效表达小流域模型不同发育阶段地貌的差异性(变化范围达0.452 ...
王民, 李占斌, 崔灵周, 李鹏
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Effect of calcium lignosulfonate on the deformation and failure characteristics of cementing stone and its modification mechanism [PDF]
, 2023 In the coalbed methane extraction of surface wells in the mining area, the mining of coal seam in working face will cause a significant disturbance to overlying rock layer, which in turn will lead to the deformation and damage of surface wells.
Quanle ZOU +4 more
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Review of Policy Research, Volume 43, Issue 2, March 2026.ABSTRACT The future of work (FoW), that is, how new technologies from automation to artificial intelligence affect the workplace, has become such a salient topic that its framing matters for the evolution of important policy areas from social protection to market and labor regulation.
Achim Kemmerling, Viddy Ranawijaya
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Shuitu Baochi Xuebao, 2004 分形理论和方法为地貌学的非线性研究开辟了新的思路。本文基于分形基本理论和GIS技术,对地处黄土高原丘陵沟壑区第一副区的岔巴沟流域地貌形态分形特征进行了量化研究,提出了流域地貌形态特征分形信息维数的计算模型和方法,并依此获得了岔巴沟流域及各支流域的地貌形态特征分形信息维数。研究表明,岔巴沟流域及各支流域的地貌形态特征分形信息维数均小于1,且与流域面积保持很强的正相关;分形信息维数揭示了流域地貌形态复杂本质的量化特征,为黄土高原小流域侵蚀产沙预报模型中宏观地貌形态因子的量化提供了新的思路和方法。
崔灵周 李占斌 肖学年
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Shuitu Baochi Xuebao, 2003 运用分形模型对不同紫色母质发育的土壤团聚体特征进行研究,结果表明:土壤团聚体粒径分布的分形维数与土壤团聚体结构破坏率存在极显著正相关(r=0.961**,n=8),与>0.25mm水稳性团聚体含量存在极显著负相关(r=-0.958**,n=8);不同紫色母质发育的土壤团聚体粒径分布的分形维数存在差异,棕紫泥土壤团聚体粒径分布的分形维数最高,暗紫泥土壤团聚体粒径分布的分形维数最低。土壤团聚体粒径分布的分形维数是评价土壤物理肥力和土壤抗蚀性的一个新指标。
骆东奇 侯春霞 魏朝富 谢德体 朱波
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