Every year in China,a significant number of mines are closed or abandoned.The pumped hydroelectric storage(PHS)and geothermal utilization are vital means to efficiently repurpose resources in abandoned mine.In this wo...Every year in China,a significant number of mines are closed or abandoned.The pumped hydroelectric storage(PHS)and geothermal utilization are vital means to efficiently repurpose resources in abandoned mine.In this work,the development potentials of the PHS and geothermal utilization systems were evaluated.Considering the geological conditions and meteorological data available of Jiahe abandoned mine,a simple evaluation model for PHS and geothermal utilization was established.The average efficiency of the PHS system exceeds 70%and the regulatable energy of a unit volume is over 1.53 kW·h/m^(3).The PHS system achieves optimal performance when the wind/solar power ratio reaches 0.6 and 0.3 in daily and year scale,respectively.In the geothermal utilization system,the outlet temperature and heat production are significantly affected by the injection flow rate.The heat production performance is more stable at lower rate flow,and the proportion of heat production is higher in the initial stage at greater flow rate.As the operating time increases,the proportion of heat production gradually decreases.The cyclic heat storage status has obvious advantages in heat generation and cooling.Furthermore,the energy-saving and emission reduction benefits of PHS and geothermal utilization systems were calculated.展开更多
自20世纪80年代起,校外活动在美国家庭生活中逐渐占据重要地位,并具备了显著的竞争性意义,这也导致中产及以上阶层父母将大量金钱和精力投入到儿童校外生活中。希拉里·弗瑞德曼的Playing to Win:Raising Children in a Competitive...自20世纪80年代起,校外活动在美国家庭生活中逐渐占据重要地位,并具备了显著的竞争性意义,这也导致中产及以上阶层父母将大量金钱和精力投入到儿童校外生活中。希拉里·弗瑞德曼的Playing to Win:Raising Children in a Competitive Culture一书深入剖析了美国中产及以上阶层家庭校外活动的历史背景、活动内容以及竞争资本的转化机制等,详细记录了家长们如何通过国际象棋、足球、舞蹈等校外竞技活动,看似在“玩”,实际上却是引导儿童内化竞争意识、积累竞争资本,揭示了美国父母“鸡娃”现象与社会竞争加剧、阶层固化之间的内在联系。这对于理解当前中国中产阶层家庭的教育选择具有重要参考价值。展开更多
随着中外学术交流的深化,学术翻译愈发受到译界的重视,但是学术论文的翻译研究仍处于相对边缘化的地位。鉴于此,本文从顺应论出发,提出该理论视阈下的学术论文翻译模型,探讨学术论文翻译的策略,并以Applying cognitive pragmatics to cr...随着中外学术交流的深化,学术翻译愈发受到译界的重视,但是学术论文的翻译研究仍处于相对边缘化的地位。鉴于此,本文从顺应论出发,提出该理论视阈下的学术论文翻译模型,探讨学术论文翻译的策略,并以Applying cognitive pragmatics to critical discourse studies:A proxi-mization analysis of three public space discourses一文的汉译为例,进一步剖析其中的具体翻译方法或技巧。研究表明,在处理学术论文词汇、句子、语法以及语篇层面的翻译问题时,译者需顺应译语语境;而在处理宏观图式层面的问题时,则需顺应源语语境。展开更多
Gas breakthrough pressure is a key parameter to evaluate the sealing capacity of caprock,and it also plays important roles in safety and capacity of CO_(2)geological storage.Based on the published experimental results...Gas breakthrough pressure is a key parameter to evaluate the sealing capacity of caprock,and it also plays important roles in safety and capacity of CO_(2)geological storage.Based on the published experimental results,we present numerical simulations on CO_(2)breakthrough pressure in unsaturated low-permeability rock under 9 multiple P-T conditions(which can keep CO_(2)in gaseous,liquid and supercritical states)and thus,a numerical method which can be used to accurately predict CO_(2)breakthrough pressure on rock-core scale is proposed.The simulation results show that CO_(2)breakthrough pressure and breakthrough time are exponential correlated with P-T conditions.Meanwhile,pressure has stronger effects on experimental results than that of temperature.Moreover,we performed sensitivity studies on the pore distribution indexλ(0.6,0.7,0.8,and 0.9)in van Genuchten-Muale model.Results show that with the increase ofλ,CO_(2)breakthrough pressure and breakthrough time both show decreasing trends.In other words,the larger the value ofλis,the better the permeability of the caprock is,and the worse the CO_(2)sealing capacity is.The numerical method established in this study can provide an important reference for the prediction of gas breakthrough pressure on rock-core scale and for related numerical studies.展开更多
基金Project(8212033)supported by the Natural Science Foundation of Beijing,ChinaProject(BBJ2023051)supported by the Fundamental Research Funds of China University of Mining and Technology-BeijingProject(SKLGDUEK202221)supported by the Innovation Fund Research Project,China。
文摘Every year in China,a significant number of mines are closed or abandoned.The pumped hydroelectric storage(PHS)and geothermal utilization are vital means to efficiently repurpose resources in abandoned mine.In this work,the development potentials of the PHS and geothermal utilization systems were evaluated.Considering the geological conditions and meteorological data available of Jiahe abandoned mine,a simple evaluation model for PHS and geothermal utilization was established.The average efficiency of the PHS system exceeds 70%and the regulatable energy of a unit volume is over 1.53 kW·h/m^(3).The PHS system achieves optimal performance when the wind/solar power ratio reaches 0.6 and 0.3 in daily and year scale,respectively.In the geothermal utilization system,the outlet temperature and heat production are significantly affected by the injection flow rate.The heat production performance is more stable at lower rate flow,and the proportion of heat production is higher in the initial stage at greater flow rate.As the operating time increases,the proportion of heat production gradually decreases.The cyclic heat storage status has obvious advantages in heat generation and cooling.Furthermore,the energy-saving and emission reduction benefits of PHS and geothermal utilization systems were calculated.
文摘自20世纪80年代起,校外活动在美国家庭生活中逐渐占据重要地位,并具备了显著的竞争性意义,这也导致中产及以上阶层父母将大量金钱和精力投入到儿童校外生活中。希拉里·弗瑞德曼的Playing to Win:Raising Children in a Competitive Culture一书深入剖析了美国中产及以上阶层家庭校外活动的历史背景、活动内容以及竞争资本的转化机制等,详细记录了家长们如何通过国际象棋、足球、舞蹈等校外竞技活动,看似在“玩”,实际上却是引导儿童内化竞争意识、积累竞争资本,揭示了美国父母“鸡娃”现象与社会竞争加剧、阶层固化之间的内在联系。这对于理解当前中国中产阶层家庭的教育选择具有重要参考价值。
文摘随着中外学术交流的深化,学术翻译愈发受到译界的重视,但是学术论文的翻译研究仍处于相对边缘化的地位。鉴于此,本文从顺应论出发,提出该理论视阈下的学术论文翻译模型,探讨学术论文翻译的策略,并以Applying cognitive pragmatics to critical discourse studies:A proxi-mization analysis of three public space discourses一文的汉译为例,进一步剖析其中的具体翻译方法或技巧。研究表明,在处理学术论文词汇、句子、语法以及语篇层面的翻译问题时,译者需顺应译语语境;而在处理宏观图式层面的问题时,则需顺应源语语境。
基金supported by Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences(Grant No.SKLGME021010)funded by the National Natural Science Foundation of China(Grant No.41702251 and 42141010)the MOE Key Laboratory of Groundwater Circulation and Environmental Evolution。
文摘Gas breakthrough pressure is a key parameter to evaluate the sealing capacity of caprock,and it also plays important roles in safety and capacity of CO_(2)geological storage.Based on the published experimental results,we present numerical simulations on CO_(2)breakthrough pressure in unsaturated low-permeability rock under 9 multiple P-T conditions(which can keep CO_(2)in gaseous,liquid and supercritical states)and thus,a numerical method which can be used to accurately predict CO_(2)breakthrough pressure on rock-core scale is proposed.The simulation results show that CO_(2)breakthrough pressure and breakthrough time are exponential correlated with P-T conditions.Meanwhile,pressure has stronger effects on experimental results than that of temperature.Moreover,we performed sensitivity studies on the pore distribution indexλ(0.6,0.7,0.8,and 0.9)in van Genuchten-Muale model.Results show that with the increase ofλ,CO_(2)breakthrough pressure and breakthrough time both show decreasing trends.In other words,the larger the value ofλis,the better the permeability of the caprock is,and the worse the CO_(2)sealing capacity is.The numerical method established in this study can provide an important reference for the prediction of gas breakthrough pressure on rock-core scale and for related numerical studies.
