Sogdian Diasporic Women’s Autonomy and Limitations:Case Study of Triple Identities of Miwnay

While the historical works discussing the trading aspect of Sogdians are abundant,a relatively small amount of researches discuss the diasporic women who moved to China with their family members(usually husbands)who are traders.The Sogdian ancient letter is among the rare sources that provide women’s perspective in Sogdian diasporic society.This work analyses the multiple identities of Miwnay,the main woman character in the Sogdian ancient letter.This paper explores the underlying privileges of women and socially constructed restrictions posed upon women.This work compares Sogdian women’s situation implied in the letters with other women figures in sedentary communities’.In this work,Sogdian women’s high autonomy is shown despite male dominance on financial resource distribution.

应变速率对高铝钢连铸坯心部热裂行为的影响

研究了应变速率对Fe-0.4C-3.5Al-1.8Mn高铝钢连铸坯糊状区热裂行为的影响。结果表明,Fe-0.4C-3.5Al-1.8Mn高铝钢连铸坯热裂发生的温度区间为1395~1418℃,临界平均应变速率不大于5.34×10^(-5)/s,并提出了防止该钢种铸坯内部裂纹的建议。

42CrMo钢圆坯芯部热裂形成条件热模拟

芯部裂纹是大断面连铸圆坯的主要缺陷,严重影响铸坯及轧材质量。由于缺乏定量判据,铸坯芯部裂纹的准确预测成为业界难题。结合数值模拟和凝固过程热模拟方法,研究了42CrMo钢连铸圆坯芯部热裂纹形成条件,并对铸坯芯部热裂风险进行了评估。首先,通过有限元模型计算了42CrMo钢圆坯芯部冷却速率和凝固末期的应变速率,为热模拟试验提供控制参数;然后,利用凝固裂纹热模拟装置再现了铸坯芯部凝固过程并在凝固末期主动加载,获得42CrMo钢圆坯芯部热裂纹形成的临界应变速率为2.12×10^(-4)~2.82×10^(-4)/s,热裂温度为1452℃,断裂应力为0.67 MPa。比较数值模拟与热模拟结果表明,当前连铸条件下铸坯中心热裂风险高,极易形成热裂纹。本研究也为连铸坯热裂风险评估提供了新的途径。