In recent years improper allocation of safety input has prevailed in coal mines in China, which resulted in the frequent accidents in coal mining operation. A comprehensive assessment of the input efficiency of coal m...In recent years improper allocation of safety input has prevailed in coal mines in China, which resulted in the frequent accidents in coal mining operation. A comprehensive assessment of the input efficiency of coal mine safety should lead to improved efficiency in the use of funds and management resources. This helps government and enterprise managers better understand how safety inputs are used and to optimize allocation of resources. Study on coal mine＇s efficiency assessment of safety input was con- ducted in this paper. A C^2R model with non-Archimedean infinitesimal vector based on output is established after consideration of the input characteristics and the model properties. An assessment of an operating mine was done using a specific set of input and output criteria. It is found that the safety input was efficient in 2002 and 2005 and was weakly efficient in 2003. However, the efficiency was relatively low in both 2001 and 2004. The safety input resources can be optimized and adjusted by means of projection theory. Such analysis shows that, on average in 2001 and 2004, 45% of the expended funds could have been saved. Likewise, 10% of the safety management and technical staff could have been eliminated and working hours devoted to safety could have been reduced by 12%. These conditions could have Riven the same results.展开更多
具有出力不确定性和反调峰特性的可再生能源大规模并网给电力系统调度运行带来了新的挑战。压缩空气储能(Compressed Air Energy Storage,CAES)系统以其调节速率快、选址灵活、使用寿命长等特点为解决可再生能源利用率低这一难题提供了...具有出力不确定性和反调峰特性的可再生能源大规模并网给电力系统调度运行带来了新的挑战。压缩空气储能(Compressed Air Energy Storage,CAES)系统以其调节速率快、选址灵活、使用寿命长等特点为解决可再生能源利用率低这一难题提供了新的解决思路。特别地,回热式压缩空气储能(Regenerative CAES,RCAES)系统因可以有效利用压缩过程释放的热量而备受关注。能量转换效率是RCAES系统的重要性能指标,但当前研究集中在系统热力学过程分析上,对其效率评估研究有限。本文从RCAES系统的电能-机械能-热能转换过程及基准参数出发,提出了一种RCAES系统效率评估方法。通过某典型RCAES系统设计方案,本文对所提方法进行了详细计算说明,验证了其合理性。展开更多
基金Project 70771105 supported by the National Natural Science Foundation of China
文摘In recent years improper allocation of safety input has prevailed in coal mines in China, which resulted in the frequent accidents in coal mining operation. A comprehensive assessment of the input efficiency of coal mine safety should lead to improved efficiency in the use of funds and management resources. This helps government and enterprise managers better understand how safety inputs are used and to optimize allocation of resources. Study on coal mine＇s efficiency assessment of safety input was con- ducted in this paper. A C^2R model with non-Archimedean infinitesimal vector based on output is established after consideration of the input characteristics and the model properties. An assessment of an operating mine was done using a specific set of input and output criteria. It is found that the safety input was efficient in 2002 and 2005 and was weakly efficient in 2003. However, the efficiency was relatively low in both 2001 and 2004. The safety input resources can be optimized and adjusted by means of projection theory. Such analysis shows that, on average in 2001 and 2004, 45% of the expended funds could have been saved. Likewise, 10% of the safety management and technical staff could have been eliminated and working hours devoted to safety could have been reduced by 12%. These conditions could have Riven the same results.
文摘具有出力不确定性和反调峰特性的可再生能源大规模并网给电力系统调度运行带来了新的挑战。压缩空气储能(Compressed Air Energy Storage,CAES)系统以其调节速率快、选址灵活、使用寿命长等特点为解决可再生能源利用率低这一难题提供了新的解决思路。特别地,回热式压缩空气储能(Regenerative CAES,RCAES)系统因可以有效利用压缩过程释放的热量而备受关注。能量转换效率是RCAES系统的重要性能指标,但当前研究集中在系统热力学过程分析上,对其效率评估研究有限。本文从RCAES系统的电能-机械能-热能转换过程及基准参数出发,提出了一种RCAES系统效率评估方法。通过某典型RCAES系统设计方案,本文对所提方法进行了详细计算说明,验证了其合理性。
