通过对《冶金等工贸行业企业安全生产预警系统技术标准(试行)》的仔细解读,企业安全生产预警状态应划分为安全、注意、警告、危险4个等级,各等级之间的界定数值为预警等级阈值。基于企业安全管理体系及大数据分析,建立了一种企业安全生...通过对《冶金等工贸行业企业安全生产预警系统技术标准(试行)》的仔细解读,企业安全生产预警状态应划分为安全、注意、警告、危险4个等级,各等级之间的界定数值为预警等级阈值。基于企业安全管理体系及大数据分析,建立了一种企业安全生产预警等级划分阈值确定的新方法。首先,构建包含所有可能导致安全生产事故风险因素的预警指标体系;然后,通过基于指标相关性的指标权重确定方法(criteria importance through intercriteria correlation,CRITIC)对指标进行赋权,并建立安全生产预警指数(safety production index,SPI)模型;最后,采用朴素贝叶斯分类器算法和高斯逼近拟合密度函数进行分析,确定4个预警等级对应的阈值,并进行等级划分。以新天钢集团为例进行实例应用,经计算得到安全(SPI≤0.44)、注意(0.44<SPI≤0.55)、警告(0.55<SPI≤0.61)、危险(SPI>0.61)的4个安全预警等级具有可行性、有效性和实用性。该研究为企业安全生产预警管理提供指导。展开更多
The Majorana zero modes in vortex cores are of extensive interest in the context of topological quantum computing.However,a zero-energy bound state may arise accidentally but is not necessarily a Majorana zero mode.Su...The Majorana zero modes in vortex cores are of extensive interest in the context of topological quantum computing.However,a zero-energy bound state may arise accidentally but is not necessarily a Majorana zero mode.Such accidental zero modes should be carefully ruled out in experiment in order to identify the genuine Majorana zero modes.We show that in a spin-orbital coupled multi-band superconductor,such as the iron-selenide superconductor,accidental zero modes indeed arise in the vortex core if the pairing symmetry is the so-called nodeless d-wave(defined in the absence of spin-orbital coupling).Instead,if the pairing sym-metry is s_(++)or s_(+−)with respect to the Fermi pockets split by the spin-orbital coupling,the accidental zero modes do not appear in the limit of weak spin-orbital coupling.Our results are not only important in the experimental identification of Majorana zero modes,but also provide an avenue to pinpoint the pairing symmetry of the iron-selenide superconductor.展开更多
文摘通过对《冶金等工贸行业企业安全生产预警系统技术标准(试行)》的仔细解读,企业安全生产预警状态应划分为安全、注意、警告、危险4个等级,各等级之间的界定数值为预警等级阈值。基于企业安全管理体系及大数据分析,建立了一种企业安全生产预警等级划分阈值确定的新方法。首先,构建包含所有可能导致安全生产事故风险因素的预警指标体系;然后,通过基于指标相关性的指标权重确定方法(criteria importance through intercriteria correlation,CRITIC)对指标进行赋权,并建立安全生产预警指数(safety production index,SPI)模型;最后,采用朴素贝叶斯分类器算法和高斯逼近拟合密度函数进行分析,确定4个预警等级对应的阈值,并进行等级划分。以新天钢集团为例进行实例应用,经计算得到安全(SPI≤0.44)、注意(0.44<SPI≤0.55)、警告(0.55<SPI≤0.61)、危险(SPI>0.61)的4个安全预警等级具有可行性、有效性和实用性。该研究为企业安全生产预警管理提供指导。
基金supported by National Key R&D Program of China(Grant No.2022YFA1403201)and National Natural Science Foundation of China(Grant No.12374147,12274205 and 92365203).
文摘The Majorana zero modes in vortex cores are of extensive interest in the context of topological quantum computing.However,a zero-energy bound state may arise accidentally but is not necessarily a Majorana zero mode.Such accidental zero modes should be carefully ruled out in experiment in order to identify the genuine Majorana zero modes.We show that in a spin-orbital coupled multi-band superconductor,such as the iron-selenide superconductor,accidental zero modes indeed arise in the vortex core if the pairing symmetry is the so-called nodeless d-wave(defined in the absence of spin-orbital coupling).Instead,if the pairing sym-metry is s_(++)or s_(+−)with respect to the Fermi pockets split by the spin-orbital coupling,the accidental zero modes do not appear in the limit of weak spin-orbital coupling.Our results are not only important in the experimental identification of Majorana zero modes,but also provide an avenue to pinpoint the pairing symmetry of the iron-selenide superconductor.
