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Dynamic impact properties of deep sandstone under thermal-hydraulicmechanical coupling loads

Journal of Mountain Science 2024年第6期21卷 2113-2129页

作者： cao chunhui DING Haonan ZOU Baoping School of Civil Engineering and Architecture Zhejiang University of Science and TechnologyHangzhou 310023China Zhejiang-Singapore Joint Laboratory for Urban Renewal and Future City Hangzhou 310023China

The deep rock mass within coal mines situated in a challenging environment are characterized by high ground stress,high geotemperature,high osmotic water pressure,and dynamic disturbances from mechanical *** investigate the impact of this complex mechanical environment on the dynamic characteristics of roof sandstone in self-formed roadways without coal pillars,standard specimens of deep sandstone from the 2611 upper tunnel working face of the Yongmei Company within the Henan Coal Chemical Industry Group in Henan,China were prepared,and an orthogonal test was *** a self-developed geotechnical dynamic impact mechanics test system,triaxial dynamic impact tests under thermal-hydraulicmechanical coupling conditions were conducted on deep *** results indicate that under high confining pressure,deep sandstone exhibits pronounced brittle failure at low temperatures,with peak strength gradually decreasing as temperature and osmotic water pressure ***,under low confining pressure and low temperature,the brittleness of deep sandstone weakens gradually,while ductility ***,sandstone demonstrates higher peak strength at low temperatures under high axial pressure conditions,lower peak strength at high temperatures,and greater strain under low axial pressure and high osmotic water *** in impact air pressure and osmotic water pressure have proportionally greater effects on peak stress and peak *** 50%of the input strain energy is utilized as effective energy driving the sandstone fracture *** analysis identifies the optimal combination of factors affecting the peak stress and peak strain of *** the coupling effect,intergranular and transgranular fractures occur within the *** images illustrate that the damage forms range from minor damage with multiple fissures to extensive fractures and severe *** study elucidates the varied dynamic impact me

关键词： Deep sandstone Thermal-hydraulicmechanical coupling Dynamic impact Stress-strain Failure Modes Polar analysis

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Influence of PTFE on Electrode Structure for Performance of PEMFC and 10-Cells Stack

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Chinese Journal of Mechanical Engineering 2012年第6期25卷 1171-1175页

作者： LIN Rui ZHAO Tiantian ZHANG Haiyan cao chunhui LI Bing MA Jianxin Clean Automotive Engineering Center Tongji University Shanghai 201804 China School of Automotive Studies Tongji University Shanghai 201804 China School of Resource and Environmental Engineering East China University of Science of Technology Shanghai 200237 China

Water plays a critical role on the performance, stability and lifetime of proton exchange membrane fuel cells（PEMFCs）. The addition of poly tetrafluoroethylene（PTFE） to the gas diffusion layer, especially, the cathode side, would optimize the transportation of water, electron and gas and thus improve the performance of the fuel cell. But until now, the studies about directly applying the PTFE to the catalyst layer are rarely reported. In this paper, the membrane electrode is fabricated by using directly coating catalyst to the membrane method（CCM） and applying PTFE directly to the cathode electrode catalyst layer. The performance of the single cell is determined by polarization curves and durability tests. Electrochemical impedance spectroscopy（EIS） and scanning electron microscopy（SEM） techniques are used to characterize the electrochemical properties of PEMFC. Also the performance of a 10-cells stack is detected. Combining the performance and the physical-chemistry characterization of PEMFC shows that addition of appropriate content of PTFE to the electrode enhances the performance of the fuel cell, which may be due to the improved water management. Addition of appropriate content of PTFE enhances the interaction between the membrane and the catalyst layer, and bigger pores and highly textured structure form in the MEA, which favors the oxygen mass transfer and protons transfer in the fuel cell. While superfluous addition of PTFE covers the surface of catalysts and hindered the contact of catalyst with Nation, which leads to the reduction of electrochemical active area and the decay of the fuel cell performance. The proposed research would optimize the water management of the fuel cell and thus improve the performance of the fuel cell.

关键词： proton exchange membrane fuel cell poly-tetrafluoroethylene electrochemical impedance spectroscopy scanning electron microscopy fuel cell stack

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Theoretic Diffraction Research on the Order-Disorder Effect of Transition Metal in Li(Ni1/3 Co1/3 Mn1/3)O2

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Journal of Harbin Institute of Technology(New Series) 2018年第6期25卷 78-89页

作者： chunhui cao Jian Zhang Chuanzheng Yang Baojia Xia Shanghai Institute of Microsystem of Information Technology Shanghai 200050China University of Chinese Academy of Sciences Beijing 100049Chin

After describing research status of super-structure for Li (Ni_(1/3)Co_(1/3)Mn_(1/3)) O_2,diffraction patterns of Li (Ni_(1/3)Co_(1/3)Mn_(1/3)) O_2 in different order parameters have been researched by Powder-cell program,including crystal structure,X-ray and neutron diffraction pattern,anomalous diffraction pattern and comparison of NiCoMn in different positions. The influence of order parameters on intensity of matrix and super-lattice diffraction lines has also been analyzed and the summarization and prospect have been made lastly.

关键词： Li(Ni Co Mn )O order-disorder diffraction

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Carbon Isotope Reversals of Changning-Weiyuan Region Shale Gas,Sichuan Basin

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Acta Geologica Sinica(English Edition) 2015年第A1期89卷 375-377页

作者： cao chunhui TANG Qingyan ZHANG Mingjie LV Zonggang School of Earth Sciences & Key Lab of Mineral Resources in Western China Gansu Province Lanzhou UniversityLanzhou 730000 Key Laboratory of Petroleum Resources Gansu Province~Key Laboratory of Petroleum Resources Research Institute ofGeology and Geophysics Chinese Academy of Sciences Lanzhou 730000 Shu'nan Gas-mine Field PetroChina Southwest Oil & Gas Field Branch Company Luozhou 648000

1 Introduction Many high yield shale gas areas in the World are discovered carbon isotope reversals： Barnett, Fayetteville （Zumberge et al., 2012）, Marcellus （Tilley et al., 2013）, Haynesville （Ferwom et al., 2008）, Albany shale gas （Gao et al., 2014）, Utica shale gas （Xia et al., 1999; Xia et al., 2012; Xia et al., 2013）, the Foothills （Tilley et al., 2011）, Horn River （Tilley et al., 2013） and Ordos basin shale gas （Wang et al., 2015; Dai et al., 2005）.

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夹点对超临界二氧化碳布雷顿再压缩循环性能的影响

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化工进展 2017年第11期36卷 3986-3992页

作者：曹春辉李惟毅中低温热能高效利用教育部重点实验室(天津大学) 天津300350

研究了超临界二氧化碳(supercritical carbon dioxide,SCO2)布雷顿再压缩循环回热器的夹点问题,分析了换热器夹点对SCO2布雷顿再压缩循环热效率、净输出功、不可逆损失和?效率等性能的影响,阐述了膨胀机进口温度和循环压比对SCO2布雷顿... 详细信息

研究了超临界二氧化碳(supercritical carbon dioxide,SCO2)布雷顿再压缩循环回热器的夹点问题,分析了换热器夹点对SCO2布雷顿再压缩循环热效率、净输出功、不可逆损失和?效率等性能的影响,阐述了膨胀机进口温度和循环压比对SCO2布雷顿再压缩循环的影响,并比较了再压缩循环和简单回热循环的性能。结果表明:夹点的位置随着分流比的增大,先出现在低温回热器低温侧的出口,然后出现在低温回热器内部,最后出现在低温回热器低温侧进口;在给定的初始条件下,分流比存在最小值,随着分流比的增大,循环的热效率和?效率先增大后减小;分流比对加热器、低温回热器、冷却器和高温回热器的?损失有较大影响;压比的增大和膨胀机进口温度的升高都会使再压缩循环最小分流比减小;在一定分流比下,再压缩循环的热效率比简单回热循环要高。

关键词：夹点超临界二氧化碳布雷顿循环优化热力学

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企业节能减排的动因探析与策略选择

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管理评论 2013年第7期25卷 3-10页

作者：曹春辉席酉民曹瑄玮西安交通大学管理学院西安710049 西交利物浦大学管理学院苏州215123

通过对低碳经济时代企业所在环境的特征辨识和利益相关者分析,将企业面向的环境划分为产品、社会、政治三重市场,指出企业节能减排的动因源于以下三个方面:即在产品市场降低成本,获得差异化竞争优势;在社会市场获得大众认可,赢得企业声... 详细信息

通过对低碳经济时代企业所在环境的特征辨识和利益相关者分析,将企业面向的环境划分为产品、社会、政治三重市场,指出企业节能减排的动因源于以下三个方面:即在产品市场降低成本,获得差异化竞争优势;在社会市场获得大众认可,赢得企业声誉;在政治市场谋求合法性与政府支持。结合已有研究,将企业节能减排划分为主动型和反应型两种策略,并针对企业节能减排的不同动因,给出了与之相匹配的策略选择模型,为企业在低碳经济时代竞争中获得持续的竞争优势提供了参考。

关键词：节能减排动因探析策略选择低碳经济

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