65Mn钢的CCT曲线及圆锯片淬火工艺

利用Formarstor一Digital全自动相变测定仪对我国现行圆锯片用钢65Mn的连续冷却转变曲线(CCT)进行了测定,研究了不同连续冷却速度下得到的组织,为合理制订圆锯片的淬火工艺提供了依据,得出了最佳淬火工艺曲线。     

Q345E低合金高强度钢Φ600 mm连铸圆坯的生产实践

Q345E钢(/%:0.14~0.17C、0.20~0.30Si、1.28~1.38Mn、≤0.011P、≤0.005S、0.015~0.030Al、0.032~0.045V)大圆坯的生产流程为65 t LD-LF-VD-Φ600 mm圆坯CC工艺。通过出钢时滑板挡渣,加入预熔合成渣(/%:40~50CaO、≤9SiO₂、30~40Al₂O₃~7MgO、8~10Al)、钢芯铝、脱氧剂和合金,控制拉速0.22 m/min,32 t中间包钢水过热度(25±5)℃,恒液面900 mm,全程保护浇铸和电磁搅拌等措施,试生产法兰用Q345E钢Φ600mm连铸圆坯。生产结果表明,铸坯表面无可见冷疤、鼓肚等缺陷,中心缩孔0.5级,中心疏松1.0级,碳偏析≤1.09,-50℃低温冲击功超过100 J,完全满足标准要求。     

热轧材冷拉过程65钢硬线断裂分析

65钢(/%:0.62～0.。70C、0.18～0.28Si、0.55～O.75Mn)硬线盘条的生产流程为120 t转炉-LF-170mm×170 mm连铸-高速线材轧制。采用光学和扫描电子显微镜分析了65钢φ6.5 mm热轧盘条在冷拉至φ1.85mm过程中断裂的原因。实验结果表明,断口宏观特征为笔尖状,盘条横截面组织均匀性较差;裂纹起源于心部粗大的先共析铁素体和粗片状渗碳体,断裂的主要原因是索氏体化率低,存在大块先共析铁素体和中心碳偏析。     

不同厂家直缝埋弧焊钢管的主要性能差异

通过对比测试采用不同厂家生产的钢板制成同规格、同钢级JCOE钢管成分、拉伸和冲击等性能,同时分析了不同厂家钢管的主要性能差异。结果表明,国内钢厂钢管比国外钢厂钢管具有较好的强度和低温夏比冲击韧性,其中钢管的屈服强度比国外钢厂钢管的屈服强度高33MPa,其母材冲击功比国外钢厂的要高107J;同时从基体成分分析了直缝埋弧焊管强度和韧性高于国外钢厂焊管的原因。     

Theragnostic Efficacy of K18 Response in Alcohol Use Disorder with Clinically Significant Fibrosis Using Gut-Liver Axis

(1) Background: Fibrosis in early-stage alcohol-associated liver disease (ALD) is commonly under-diagnosed in routine clinical practice. This study characterized the liver-injury and cell death response in alcohol use disorder (AUD) patients with ALD who also exhibited fibrosis and assessed the efficacy of standard of care (SOC) treatment in the improvement in liver injury. (2) Methods: Forty-eight heavy-drinking AUD patients aged 21–65 yrs. without clinical manifestations of liver injury were grouped by Fibrosis-4 (FIB-4) score, as negative (Gr.1 < 1.45, n = 21) or positive (Gr.2 ≥ 1.45, n = 27). Patients received 2-weeks (2 w) inpatient SOC. Data on demographics, drinking patterns, liver-injury, immune markers, and liver cell death (K18s) markers were analyzed at baseline (BL) and after 2 w SOC. (3) Results: Lifetime drinking (LTDH, yrs.) and acute heavy drinking (Heavy Drinking Days Past 90 Days [HDD90]) markers were significantly higher in Gr.2 vs. Gr.1. BL ALT, AST, AST:ALT and K18M65 were considerably higher in Gr.2. Dysregulated gut dysfunction and elevated immune activity were evident in Gr.2 characterized by TNF-α, IL-8 and LPS levels. After SOC, Gr.2 showed improvement in AST, ALT, AST/ALT ratio; and in the K18M65, K18M30 and K18M65/M30 ratio vs. Gr.1. The true positivity of BL IL-8 response to predict the improvement in K18M65 to normal levels among Gr.2 patients against those who did not have improvement after 2 w SOC was very high (AUROC = 0.830, p = 0.042). (4) Conclusions: Gut dysfunction, elevated cytokine response and necrotic liver cell death were elevated in AUD patients with early-stage ALD. K18 showed promise as a predictive theragnostic factor to differentiate among the AUD patients with early-stage ALD and baseline fibrosis who had improvement in liver injury against those who did not, by the levels of baseline IL-8.     

浸没式光刻的优势和可行性

浸没式光刻通过高折射率的液体充入透镜底部和片子之间的空间使光学系统的数值孔径具有显著的优势。在193nm曝光系统中,水(折射率为1.44)被选作最佳的浸入液体。通过成像模拟,现已证明ArF穴193nm雪浸没式光刻(NA=1.05～1.23)与F2穴157nm雪干法穴NA=0.85～0.93雪光刻具有几乎相同的成像性能。结合流体力学和热模拟结果,讨论了ArF浸没式曝光设备的优势和可行性。     

28 nm低功耗工艺SRAM失效分析

在28 nm低功耗工艺平台开发过程中,对1.26 V测试条件下出现的SRAM双比特失效问题进行了电性能失效模式分析及物性平面和物性断面分析.指出失效比特右侧位线接触孔底部空洞为SRAM制程上的缺陷所导致.并通过元素成分分析确定接触孔底部钨(W)的缺失,接触孔底部外围粘结阻挡层的氮化钛(TiN)填充完整.结合SRAM写操作的原理从电阻分压的机理上解释了较高压下双比特失效,1.05 V常压下单比特不稳定失效,0.84 V低电压下失效比特却通过测试的原因.1.26 V电压下容易发生的双比特失效是一种很特殊的SRAM失效,其分析过程及结论在集成电路制造行业尤其是对先进工艺制程研发过程具有较好的参考价值.     

基于TOP247Y多路隔离输出开关电源的设计

介绍了一种采用TOP247Y芯片设计的多路隔离输出开关电源。在阐述其工作原理的基础上给出了利用PI Transformer Designer软件设计变压器的方法,完成了多路隔离输出开关电源的设计,并完成了样机制作,其结构简单,操作方便。实验结果表明：该电源动态性能良好,稳定性高,可用作IPM模块的专用驱动电源以及其他外围电路工作电源。文中提供了一种高效、快捷、灵活的电源设计方案。     

138 W窄脉宽全固态绿光激光器

报道了绿光平均功率达138 W的声光调Q内腔倍频全固态Nd∶YAG绿光激光器。为了进一步提高绿光激光器的输出功率以及压窄脉宽,通过倍频晶体相位匹配角随温度变化的分析以及腔型的研究,设计并优化了U型谐振腔。实验中采用两个聚光腔,每个聚光腔由35个20 W的高功率激光二极管(LD)侧面抽运Nd∶YAG棒,利用Ⅱ类相位匹配KTP晶体腔内倍频,实现了高平均功率内腔倍频激光器的稳定运转。在两个聚光腔的激光二极管抽运电流分别为18.5 A,20.5 A时,获得了重复频率为10 kHz,脉冲宽度优于49 ns,输出功率为138 W的高功率、高重复频率、窄脉宽绿光(532 nm)输出,光-光转换效率为14.1%,不稳定度为±2.8%。     

日光对532nm激光成像性能影响实验分析

532 nm激光成像雷达在成像过程中容易受到日光干扰而降低图像信噪比。利用532 nm条纹管激光雷达对复杂场景(建筑物群)进行昼夜成像实验,并采用直方图统计法分析同一场景分别在白昼和夜晚的激光强度像和距离像的像素值分布,进而分析日光对激光成像性能影响。实验结果表明:日照光会提高激光强度像的亮度以及背景/目标的对比度,同时也增加了距离像的空天背景噪声;夜晚激光距离像信噪比高,但目标强度像对比度不佳。