The Wugong Mts. region may have experienced three stages of metamorphism in Early Paleo-zoic, which may be closely related to the generations of regional deformation. The first stage ismedium-pressure metamorphism, th...The Wugong Mts. region may have experienced three stages of metamorphism in Early Paleo-zoic, which may be closely related to the generations of regional deformation. The first stage ismedium-pressure metamorphism, the second medium- and high-pressure one with stress on high-pressure metamorphism, and the third low-pressure and high-temperature metamorphism. Theregion, as a whole, is a Caledonian medium-high pressure metamorphic belt.展开更多
为明确山东临沂和河南周口地区中高温大曲细菌群落结构及菌群基因功能的差异,本研究采用MiSeq高通量测序技术对2个地区中高温大曲的细菌群落结构进行了解析,并基于直系同源蛋白数据库(clusters of orthologous groups of proteins,COG)...为明确山东临沂和河南周口地区中高温大曲细菌群落结构及菌群基因功能的差异,本研究采用MiSeq高通量测序技术对2个地区中高温大曲的细菌群落结构进行了解析,并基于直系同源蛋白数据库(clusters of orthologous groups of proteins,COG)分析了其细菌类群潜在的功能。α多样性发现,两者在丰富度和多样性上差异均不显著(P>0.05)。相较于周口地区大曲,在门水平上,临沂地区大曲中放线菌门(Actinobacteria)和拟杆菌门(Bacteroidetes)平均相对丰度均显著偏低(P<0.05),在属水平上,不动杆菌属(Acinetobacter)平均相对丰度显著偏高(P<0.05),地杆菌属(Geobacter)和泛菌属(Pantoea)平均相对丰度均显著偏低(P<0.05)。LEfSe(linear discriminant analysis effect size)分析发现,Geobacter为周口地区大曲中的生物标志物,而临沂地区大曲中的生物标志物未在属水平体现;β多样性发现,两者在整体上存在明显差异;PICRUSt(phylogenetic investigation of communities by reconstruction of unobserved states)分析发现,临沂地区中高温大曲在转录、氨基酸和核苷转运与代谢功能上显著高于周口地区大曲(P<0.05)。由此可见,2个地区中高温大曲的细菌群落结构及菌群基因功能表达均存在明显差异。展开更多
The flux cored wires with different rare earth oxide additions for hardfacing the workpieces of medium-high carbon steel were developed. The microstrucmre of the hardfacing layer was observed using the optical microsc...The flux cored wires with different rare earth oxide additions for hardfacing the workpieces of medium-high carbon steel were developed. The microstrucmre of the hardfacing layer was observed using the optical microscopy. The average dimension of primary austenite grains in hardfacing layer was measured by image analyzer. The primary austenite grain growth activation energy and index were calculated according to Sellars＇s mode and Beck formula, respectively. Moreover, the effect of rare earth oxide on the growth dynamics of primary aus- tenite grain was analyzed, and then discussed with the misfit theory. The experimental results showed that, by adding rare earth oxide, the av- erage dimension of primary austenite grains in hardfacing layer of medium-high carbon steel decreased, and it was the smallest when the ad- dition of rare earth oxide was 5.17 wt.%. Meanwhile, at this rare earth oxide addition, the primary austenite grain growth activating energy in hardfacing layer was the largest, while its index was the smallest. The calculated results indicated that the primary austenite grain could be refined because LaAlO3 as heterogeneous nuclei of γ-Fe was the most effective.展开更多
文摘The Wugong Mts. region may have experienced three stages of metamorphism in Early Paleo-zoic, which may be closely related to the generations of regional deformation. The first stage ismedium-pressure metamorphism, the second medium- and high-pressure one with stress on high-pressure metamorphism, and the third low-pressure and high-temperature metamorphism. Theregion, as a whole, is a Caledonian medium-high pressure metamorphic belt.
文摘为明确山东临沂和河南周口地区中高温大曲细菌群落结构及菌群基因功能的差异,本研究采用MiSeq高通量测序技术对2个地区中高温大曲的细菌群落结构进行了解析,并基于直系同源蛋白数据库(clusters of orthologous groups of proteins,COG)分析了其细菌类群潜在的功能。α多样性发现,两者在丰富度和多样性上差异均不显著(P>0.05)。相较于周口地区大曲,在门水平上,临沂地区大曲中放线菌门(Actinobacteria)和拟杆菌门(Bacteroidetes)平均相对丰度均显著偏低(P<0.05),在属水平上,不动杆菌属(Acinetobacter)平均相对丰度显著偏高(P<0.05),地杆菌属(Geobacter)和泛菌属(Pantoea)平均相对丰度均显著偏低(P<0.05)。LEfSe(linear discriminant analysis effect size)分析发现,Geobacter为周口地区大曲中的生物标志物,而临沂地区大曲中的生物标志物未在属水平体现;β多样性发现,两者在整体上存在明显差异;PICRUSt(phylogenetic investigation of communities by reconstruction of unobserved states)分析发现,临沂地区中高温大曲在转录、氨基酸和核苷转运与代谢功能上显著高于周口地区大曲(P<0.05)。由此可见,2个地区中高温大曲的细菌群落结构及菌群基因功能表达均存在明显差异。
基金Program supported by National Nature Science Foundation of China(51271163)Key Project of Science and Technology of Hebei Province(09215106D)
文摘The flux cored wires with different rare earth oxide additions for hardfacing the workpieces of medium-high carbon steel were developed. The microstrucmre of the hardfacing layer was observed using the optical microscopy. The average dimension of primary austenite grains in hardfacing layer was measured by image analyzer. The primary austenite grain growth activation energy and index were calculated according to Sellars＇s mode and Beck formula, respectively. Moreover, the effect of rare earth oxide on the growth dynamics of primary aus- tenite grain was analyzed, and then discussed with the misfit theory. The experimental results showed that, by adding rare earth oxide, the av- erage dimension of primary austenite grains in hardfacing layer of medium-high carbon steel decreased, and it was the smallest when the ad- dition of rare earth oxide was 5.17 wt.%. Meanwhile, at this rare earth oxide addition, the primary austenite grain growth activating energy in hardfacing layer was the largest, while its index was the smallest. The calculated results indicated that the primary austenite grain could be refined because LaAlO3 as heterogeneous nuclei of γ-Fe was the most effective.
