The electronic structure of ferrite (tempered martensite phase) in high Co-Ni secondary hardened martensitic steel has been investigated. The local density of states (LOOS) of alloying elements in the steel displays t...The electronic structure of ferrite (tempered martensite phase) in high Co-Ni secondary hardened martensitic steel has been investigated. The local density of states (LOOS) of alloying elements in the steel displays the relationship between solid solubility and the shape of the LDOS. The bond order integral (BOI) between atoms in the steel shows that the directional bonding of the p orbital of Si or C leads to the brittleness of the steel. At last, ΣBOI between atoms demonstrate that C, Co, Mn, Cr, Mo, Si strengthen the alloyed steel through solid-solution effects.展开更多
为探究电子束剂量率对充氮包装冷鲜牛肉蛋白结构和理化性质的影响,用高能电子加速器辐照处理黄牛背最长肌,然后于4℃条件贮藏25 d,以2.5 k Gy辐照剂量,研究辐照组(辐照剂量率分别为30、150、300 k Gy/min)和对照组对肌原纤维蛋白二级结...为探究电子束剂量率对充氮包装冷鲜牛肉蛋白结构和理化性质的影响,用高能电子加速器辐照处理黄牛背最长肌,然后于4℃条件贮藏25 d,以2.5 k Gy辐照剂量,研究辐照组(辐照剂量率分别为30、150、300 k Gy/min)和对照组对肌原纤维蛋白二级结构、肌肉热稳定性和相关理化性质的影响。结果表明:辐照组和对照组相比,表面活性巯基质量摩尔浓度显著下降,在贮藏第0天,辐照组的活性巯基质量摩尔浓度分别下降了19.05%、22.00%和22.60%,差异显著(P<0.05);电子束处理使肌原纤维蛋白疏水性和溶解度下降,α-螺旋和β-折叠结构含量减少,无规卷曲和β-转角结构含量增加,蛋白质的无序程度增加;电子束处理组肌球蛋白氧化变性降解,对热稳定性下降。电子束处理改变了牛肉肌原纤维蛋白的结构,由此导致其某些理化性质发生变化,进而对其品质产生一定的影响,而150 k Gy/min剂量率的处理对牛肉蛋白结构和品质的影响相对较小。展开更多
文摘The electronic structure of ferrite (tempered martensite phase) in high Co-Ni secondary hardened martensitic steel has been investigated. The local density of states (LOOS) of alloying elements in the steel displays the relationship between solid solubility and the shape of the LDOS. The bond order integral (BOI) between atoms in the steel shows that the directional bonding of the p orbital of Si or C leads to the brittleness of the steel. At last, ΣBOI between atoms demonstrate that C, Co, Mn, Cr, Mo, Si strengthen the alloyed steel through solid-solution effects.
文摘为探究电子束剂量率对充氮包装冷鲜牛肉蛋白结构和理化性质的影响,用高能电子加速器辐照处理黄牛背最长肌,然后于4℃条件贮藏25 d,以2.5 k Gy辐照剂量,研究辐照组(辐照剂量率分别为30、150、300 k Gy/min)和对照组对肌原纤维蛋白二级结构、肌肉热稳定性和相关理化性质的影响。结果表明:辐照组和对照组相比,表面活性巯基质量摩尔浓度显著下降,在贮藏第0天,辐照组的活性巯基质量摩尔浓度分别下降了19.05%、22.00%和22.60%,差异显著(P<0.05);电子束处理使肌原纤维蛋白疏水性和溶解度下降,α-螺旋和β-折叠结构含量减少,无规卷曲和β-转角结构含量增加,蛋白质的无序程度增加;电子束处理组肌球蛋白氧化变性降解,对热稳定性下降。电子束处理改变了牛肉肌原纤维蛋白的结构,由此导致其某些理化性质发生变化,进而对其品质产生一定的影响,而150 k Gy/min剂量率的处理对牛肉蛋白结构和品质的影响相对较小。
