The bioconversion of coal at ambient conditions is a promising technology for coal processing, although the mechanisms of coal degradation are still not understood fully. In this work, the bioconversion of lig- nite w...The bioconversion of coal at ambient conditions is a promising technology for coal processing, although the mechanisms of coal degradation are still not understood fully. In this work, the bioconversion of lig- nite was studied using a fungus isolated from decaying wood. The lignite samples were oxidized with nitric acid under moderate conditions and then the oxidized samples were placed on a potato medium with isolated fungus for lignite bioconversion. Lignite, oxidized lignite and residual products after bioconversion of lignite were sequentially extracted with petroleum ether, CS2, methanol, acetone and tetrahydrofuran （THt：）, and then each extract was characterized by gas chromatography-mass spectrom- etry （GC/MS）. The differences in composition and structure among the samples were inferred by compar- ing the differences between the extracts. The results show that aromatics with one or several benzene rings and their derivatives; and some long-chain alkanes containing oxygen decreased in the metha- nol-, acetone-, and THF-soluble fraction from residual lignite, whereas long chain or a few branched alkanes and small quantities of aromatic compounds increased in petroleum ether and CS2 soluble fractions.展开更多
数字化转型是现代化企业的发展趋势,在车企质量数字化管理系统中,故障编码体系是实现有效质量管理的基础。通过分析售后故障编码体系的全价值链应用环节,将故障配件与BOM(Bill of Materials,物料清单)及VPPS(Vehicle Partitioning&P...数字化转型是现代化企业的发展趋势,在车企质量数字化管理系统中,故障编码体系是实现有效质量管理的基础。通过分析售后故障编码体系的全价值链应用环节,将故障配件与BOM(Bill of Materials,物料清单)及VPPS(Vehicle Partitioning&Product Structure,整车零件分解及产品结构规范)结合,形成全新售后故障编码体系,使故障配件直接关联售后故障代码前3级,实现数字化系统自动识别,通过分级缩小故障现象选取范围,便于信息提报人员选取,提高操作准确率,并建立故障配件与专业科室及工程师的对应关系,实现信息点对点传递。所建立的售后故障编码体系为车企质量管理数字化发展提供基础保证。展开更多
基金supported by the Fundamental Research Funds for the Central Universities (No. 2010QNB12)the National Natural Science Foundation of China (No. 50921002)
文摘The bioconversion of coal at ambient conditions is a promising technology for coal processing, although the mechanisms of coal degradation are still not understood fully. In this work, the bioconversion of lig- nite was studied using a fungus isolated from decaying wood. The lignite samples were oxidized with nitric acid under moderate conditions and then the oxidized samples were placed on a potato medium with isolated fungus for lignite bioconversion. Lignite, oxidized lignite and residual products after bioconversion of lignite were sequentially extracted with petroleum ether, CS2, methanol, acetone and tetrahydrofuran （THt：）, and then each extract was characterized by gas chromatography-mass spectrom- etry （GC/MS）. The differences in composition and structure among the samples were inferred by compar- ing the differences between the extracts. The results show that aromatics with one or several benzene rings and their derivatives; and some long-chain alkanes containing oxygen decreased in the metha- nol-, acetone-, and THF-soluble fraction from residual lignite, whereas long chain or a few branched alkanes and small quantities of aromatic compounds increased in petroleum ether and CS2 soluble fractions.
文摘数字化转型是现代化企业的发展趋势,在车企质量数字化管理系统中,故障编码体系是实现有效质量管理的基础。通过分析售后故障编码体系的全价值链应用环节,将故障配件与BOM(Bill of Materials,物料清单)及VPPS(Vehicle Partitioning&Product Structure,整车零件分解及产品结构规范)结合,形成全新售后故障编码体系,使故障配件直接关联售后故障代码前3级,实现数字化系统自动识别,通过分级缩小故障现象选取范围,便于信息提报人员选取,提高操作准确率,并建立故障配件与专业科室及工程师的对应关系,实现信息点对点传递。所建立的售后故障编码体系为车企质量管理数字化发展提供基础保证。
