Results 11 to 20 of about 13,853 (179)
Pore structure characteristics of middle and low rank coals and their influence on gas desorption characteristics [PDF]
, 2022 The pore structure of coal is an important factor affecting gas storage and migration. In order to further study the gas desorption characteristics of low and medium metamorphic coals, 6 sets of coal samples from the Fukang mining area were selected for ...
Bang REN, Cuixia WANG, Jikun LIU
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Zhejiang Daxue xuebao. Lixue ban, 2022 准噶尔盆地东北缘卡拉麦里地区是我国重要的金矿分布区，区内断裂系统错综复杂，控矿作用显著，需对不同方位、不同规模断裂系统的空间分布规律、发育复杂程度及对金矿床的控制规律进行深入研究，目前尚未见对该区域断裂系统的分形特征与金矿分布关系研究。对准噶尔盆地东北缘卡拉麦里地区断裂构造进行了不同尺度、不同方位的分形维数计算，得到全部断裂构造的分形维数为1.421，各方向断裂构造的分形维数：NW向为1.382，NWW向为1.223，近EW向为0.976，NE向为0.960 ...
SUNWenjie(孙文洁) +3 more
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The relationship between permeability and pore structure of coal slime filter cake based on fractal characteristics [PDF]
, 2023 Establishing the correlation between the complex microscopic pore structure characteristics of the filter cake and the macroscopic seepage behavior is an important basis for solving the difficulty of coal slime dewatering.
Ruxia CHEN, Xianshu DONG, Zeyu FENG
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地矿测绘, 2019 无人机倾斜摄影测量技术是当前测绘领域一项新兴热门的技术,文章以飞图横空6型无人机搭载的五镜头相机进行倾斜摄影测量为例,介绍建立高精度、高分辨率实景三维模型的技术原理和生产流程。通过对三维模型精度分析评估,为以后开展高效率、高精度大比例尺数字地形图、矿山治理、不动产测量等项目提供参考。
国辉 杨
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Zhejiang Daxue xuebao. Lixue ban, 2017 分形维数是壳聚糖絮凝中药水提液絮体的重要参数，采用图像法测定絮体的分形维数，并应用Zeta电位仪测定了絮凝体系的ζ电位，对絮凝机理和絮凝效果进行了研究.选用壳聚糖作为絮凝剂，对白芍水提液进行净化除杂，通过改变絮凝剂投加量、絮凝温度、絮凝pH值等操作条件，探究这些因素对絮凝效果的影响，分析不同条件下絮体分形维数的变化规律：随着絮凝剂投加量的增加，絮体分形维数呈下降趋势；絮体分形维数随温度或pH值的升高出现先增大后降低的情况.通过正交实验确定白芍水提液的最佳工艺条件为絮凝剂投加量0.310 g • L-1 ...
ZHANGJianwei(张建伟) +3 more
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Research on the fracture evolution law and combined bearing structure load of shallow buried coal seam group [PDF]
, 2023 The high-intensity mining of shallow-buried coal seams leads to the fracture of the bearing strata to form a combined bearing structure, which complicates the distribution of cracks in the overlying rock and causes serious damage to the surface. In order
Jie ZHANG, Yifeng HE
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Permeability and microstructure of pyrolysis lignite [PDF]
, 2023 In order to study the influence of micro pore fissure structure on permeability under the thermal-fluid-solid coupling during lignite pyrolysis, real-time CT scanning of lignite during low-temperature pyrolysis was carried out by using the μCT225kVFCB ...
Feng LIN +3 more
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Zhejiang Daxue xuebao. Lixue ban, 2023 以研究二维自治g-Navier-Stokes方程解的全局渐近性为目的，用算子分解方法证明了在有界区域上含非线性阻尼的二维自治g-Navier-Stokes方程解的双全局吸引子存在性，并估计了其Hausdorff 维数和Fractal维数。结果表明，该方程解的双全局吸引子存在且具有有限的Hausdorff 维数和有限的分形维数。
王小霞(WANG Xiaoxia) +2 more
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Computer simulation for fractal aggregates on nonlattice substrates(无格点基底表面分形凝聚体的计算机模拟)
Zhejiang Daxue xuebao. Lixue ban, 2000 对具有周期性边界条件的无格点正方形基底表面分形凝聚体的形成进行了计算机模拟。凝聚体由二种大小不同的圆盘组成。结果表明，凝聚体的分形维数几乎与表面覆盖率成正比，其斜率随圆盘的平均直径的增大而减小。当表面覆盖率很小时，分形维数几乎与圆盘的平均直径无关，约为1.45；当表面覆盖率较大时，分形维数随圆盘的平均直径的增大而减小。
XIAA-gen(夏阿根) +3 more
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Zhejiang Daxue xuebao. Lixue ban, 2005 计算一类Sierpinski地毯的Hausdorff测度，利用投影降低分形维数及分形的分细分析方法，得到了这一类Sierpinski地毯的Hausdorff测度准确值.当这类Sierpinski地毯的Hausdorff维数s ∈ [log54，1]时，有Hausdorff测度准确值为Hs(S) = 1.
HEQin-bin(贺勤斌)
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