Fractal characteristics of fiber lithium slag concrete cracks under sulfate attack [PDF]
, 2022 Natural corrosion of concrete structure due to sulfate poses a serious threat to people's lives and property. Therefore, it is of great practical significance to study the phenomenon of sulfate corrosion on concrete.
Guang-tai ZHANG +3 more
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磺酸功能化共价有机骨架固相微萃取纤维的制备及其在小鼠脑部神经递质分析中的应用
Se pu = Chinese journal of chromatography, 2023 神经递质(NTs)是细胞间交流的基本化学物质之一,研究表明,其含量的异常变化与多种神经性疾病相关。因此,建立精准的分析方法对神经递质的检测具有重要意义。本研究以三醛基间苯三酚和1,4-二氨基-2-硝基苯为共价有机骨架单体,经过衍生化后,在室温下制备了一种结晶性好、化学/热稳定性好、疏水性强、介孔结构均匀的磺酸功能化共价有机骨架材料(COF-SO3H)。然后,将其涂敷在不锈钢纤维上制备了具有强阳离子交换作用的新型涂层,利用扫描电镜、红外光谱、N2吸附-脱附等表征手段对COF-SO3H纤维的形貌 ...
Chengxun Yang +6 more
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Key technologies for extraction and identification of gas target area for pressure relief in inclined thick coal seam [PDF]
, 2023 In order to study the dip angle effect on the evolution law of the target area for pressure relief gas drainage in inclined thick coal seams, the physical similarity simulation test and theoretical analysis were combined to study the fracture evolution ...
Haifei LIN +4 more
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Influence of diameter of empty hole on the fragmentation effect of parallel cut blasting under confining pressure [PDF]
, 2023 Cut blasting is the key technology for roadway blasting excavation. High confining pressure has obvious inhibition effect on cut blasting effect, while empty hole is of great significance to improve cut blasting efficiency, but the relevant research is ...
Baohe ZHU +6 more
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Experimental study on characterization hydraulic fracturing coal fracture network and evolution of fracture forming performance [PDF]
, 2023 The accurate characterization of coal fracture network can effectively evaluate the fracturing effect of the deep coal seam after hydraulic fracturing.
Changbao JIANG, Guangqi WANG, Yinlan FU
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Multi-scale distribution of coal fractures based on CT digital core deep learning [PDF]
, 2023 In order to realize high-precision and high-efficiency identification of multi-scale distribution characteristics of coal fractures, carry out the study of multi-scale distribution characteristics identification methods based on CT digital core deep ...
Dong ZHOU +4 more
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教育研究, 2020 数形结合作为一种数学思想方法,可以为我们转换思维方式、降低问题难度起到一定效果。初中数学是一门基础性学科,数学与数形之间存在密切的关联。数形结合的教学方法伴随着新课程改革标准的深入而广泛应用到初中数学教学之中,对培养学生的数学思维能力和知识应用能力具有积极影响。本文通过对数学教学中数形结合的应用分析,提出一些方法,加强课堂效率。
美玲 郭
semanticscholar +1 more source
Fractal characteristics of pore structures on different coal structures and its research significance [PDF]
, 2023 The occurrence and production of coalbed methane is related to the development degree of pore system in coal reservoirs. The pore structure characteristics of original structural coal seam will change significantly after damage and deformation, thus ...
Baoyu WANG +3 more
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工程建设, 2020 粗粒土级配是影响抗剪强度的重要因素之一。在分形理论的基础上，为了探究粗粒土级配与抗剪强度间的相关性规律，设计了五组不同级配的试样，并通过粒度分形曲线求得其分形维数。以室内大三轴试验进行研究，获得了内摩擦角和粘聚力随分形维数增大而减小的变化规律。并通过理论推导获取分形维数与不均匀系数Cu及曲率系数Cc的定量关系式，当分形维数位于(1.89,2.63]这个区间时，可认为级配是良好的。
鑫 黄
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Micro morphology and pore structure of macerals in coal observed by atomic force microscopy (AFM) [PDF]
, 2023 Coal is not only important energy resource, but also potential source of materials. As energy resource, coal has these physical properties which are important for comprehensive applications and transformations.
Hao CHEN +4 more
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