40CrNiMo的价电子结构及其对相变动力学的影响

利用余瑞璜的“固体与分子经验电子理论“对40 CrNiMo奥氏体结构进行了键距差(BLD)分析,依据原子杂化状态、原子磁距、实验键距等已知资料建立了40 CrNiMo奥氏体的价电子结构;用固溶体微观不均匀性理论进行推理揭示了C-Cr,C-Ni,C-Mo在奥氏体中的短程偏聚。用电子显微分析及能谱分析证实了C-Cr,C-Ni,C-Mo偏聚对相变产物的影响。据此,40 CrNiMo等温转变动力学曲线的形成便追溯到合金相的价电子结构。     

高频超声分析肩袖病变与肱二头肌长头肌腱病变临床特点及相关性

本文通过高频超声检查分析了肩袖病变与肱二头肌长头肌腱(long head of the biceps brachii tendon,LHBT)病变的临床特点及相关性.文中对32例肩关节镜手术患者的术前肩关节超声检查结果与肩关节镜手术结果进行了 一致性检验.按照不同肩袖病变类型对患者进行分组,对组间LHBT病变类型的差异...     

延迟退休和经济增长

§ 1　IntroductionPopulation aging is a common feature in developed economies.How to deal with it?Most governments turn to postponing retirement.What impact does it have on macroeco-nomic performance?For instance,if a longer working time decreases the ratio of retiredpeople to working people,does itincrease the aggregate saving rate?Doesittherefore accel-erate economic growth?We study these issues in a general equilibrium model of life cyclesavings combined with endogenous growth.An intuitiv…     

对硝基甲苯与多硫化钠反应的机理研究

对硝基甲苯与多硫化钠在乙醇-水溶液中加热,可以生成对氨基苯甲醛,这是目前工业上合成对氨基苯甲醛的最佳途径。本文用紫外-可见光谱仪监测反应过程吸收光谱的变化,并测定了反应物的电子自旋共振谱,以探索这一反应的正确机理。     

Majorana Corner Modes and Flat-Band Majorana Edge Modes in Superconductor/Topological-Insulator/Superconductor Junctions

Recently, superconductors with higher-order topology have stimulated extensive attention and research interest. Higher-order topological superconductors exhibit unconventional bulk-boundary correspondence, thus allow exotic lower-dimensional boundary modes, such as Majorana corner and hinge modes. However, higher-order topological superconductivity has yet to be found in naturally occurring materials. We investigate higher-order topology in a two-dimensional Josephson junction comprised of two s...