China is Korea’s main trade partner in East Asia and one of its key economic and trade partners worldwide.The two countries have complementary industrial structure and a long history of trade exchanges.However,agains...China is Korea’s main trade partner in East Asia and one of its key economic and trade partners worldwide.The two countries have complementary industrial structure and a long history of trade exchanges.However,against the backdrop of a return to global trade protectionism and the politicization of international affairs with Yoon Suk-yeol coming to power,South Korea has undertaken a strong trade shift toward the United States(US),triggering a change in the pattern of economic cooperation in East Asia and challenging the regional trade structure.A review of the trade policy agenda of the Yoon Suk-yeol administration toward the US and China,along with a comparative review of Korea’s foreign trade stance under Moon Jae-in,allows for an analysis of the turnaround and characteristics of Yoon’s trade policy toward China during his tenure.The implications for global trade governance and regional security are further analyzed with an aim of finding a Nash equilibrium in trade cooperation among East Asian countries.展开更多
碳纳米管(CNT)因其优异的物理性能被广泛认为是一种有效的挥发性有机化合物(VOCs)吸附剂。然而,由于团聚效应产生传质阻力,会影响CNT的吸附性能。微纤复合材料作为一种新型结构材料,有效克服了这一问题。文中采用化学气相沉积(CVD)法在...碳纳米管(CNT)因其优异的物理性能被广泛认为是一种有效的挥发性有机化合物(VOCs)吸附剂。然而,由于团聚效应产生传质阻力,会影响CNT的吸附性能。微纤复合材料作为一种新型结构材料,有效克服了这一问题。文中采用化学气相沉积(CVD)法在纸状烧结不锈钢纤维载体(PSSF)表面分别直接生长CNT和硫掺杂碳纳米管(SCNT),成功制备了具有梯度多孔结构的CNT/PSSF和SCNT/PSSF复合材料。通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、热重分析技术(TG)、拉曼光谱(Raman)、傅里叶变换红外光谱仪(FT-IR)和X射线光电子能谱(XPS)对其进行系统表征。固定床反应器中的吸附实验结果表明,SCNT/PSSF因其表面丰富的缺陷和酸碱官能团,展现出优异的动态吸附性能。此外,通过构建由颗粒CNT和SCNT/PSSF组成的结构化固定床,研究了微纤复合材料在二甲苯吸附过程中的传质增强机理。与纯5 cm CNT结构床相比,4 cm CNT+1 cm SCNT/PSSF床层的利用率(ΔZ)提高了8.1%。结构化固定床的吸附过程可以被Yoon-Nelson模型良好拟合。展开更多
研究了活性炭固定床对水中苯酚的动态吸附特性及影响因素。结果表明,活性炭对苯酚废水的动态吸附随进水苯酚含量和流量的增大穿透时间缩短,但最大设计体积流量不能超过6.47 m L/min;随固定床高度增加,穿透时间推迟,但最小设计高度不能小...研究了活性炭固定床对水中苯酚的动态吸附特性及影响因素。结果表明,活性炭对苯酚废水的动态吸附随进水苯酚含量和流量的增大穿透时间缩短,但最大设计体积流量不能超过6.47 m L/min;随固定床高度增加,穿透时间推迟,但最小设计高度不能小于8 cm。无效层厚度随进水流量和固定床高度的增加而增大,随进水苯酚含量增大而减少。经拟合发现实验结果更符合Yoon-Nelson模型,且相关系数都在0.9以上。展开更多
研究了CrS@酵母复合吸附剂对阳离子型染料亚甲基蓝的吸附性能,考察了在不同pH值、流速V、床高H、初始浓度c_0条件下对亚甲基蓝染料的吸附效果,以探究最佳吸附条件。结果表明,在溶液pH值为3,流速5 m L/min,床高H=1.5 cm,初始浓度c=50 mg/...研究了CrS@酵母复合吸附剂对阳离子型染料亚甲基蓝的吸附性能,考察了在不同pH值、流速V、床高H、初始浓度c_0条件下对亚甲基蓝染料的吸附效果,以探究最佳吸附条件。结果表明,在溶液pH值为3,流速5 m L/min,床高H=1.5 cm,初始浓度c=50 mg/L时吸附效果最好。采用动力学模型Yoon-Nelson对不同条件下吸附曲线进行分析,相关系数R^2均大于0.9,本次研究结果对于甲基蓝废水的处理具有很重要的参考价值,并且对于我国染料废水的处理可提供借鉴。展开更多
文摘China is Korea’s main trade partner in East Asia and one of its key economic and trade partners worldwide.The two countries have complementary industrial structure and a long history of trade exchanges.However,against the backdrop of a return to global trade protectionism and the politicization of international affairs with Yoon Suk-yeol coming to power,South Korea has undertaken a strong trade shift toward the United States(US),triggering a change in the pattern of economic cooperation in East Asia and challenging the regional trade structure.A review of the trade policy agenda of the Yoon Suk-yeol administration toward the US and China,along with a comparative review of Korea’s foreign trade stance under Moon Jae-in,allows for an analysis of the turnaround and characteristics of Yoon’s trade policy toward China during his tenure.The implications for global trade governance and regional security are further analyzed with an aim of finding a Nash equilibrium in trade cooperation among East Asian countries.
文摘碳纳米管(CNT)因其优异的物理性能被广泛认为是一种有效的挥发性有机化合物(VOCs)吸附剂。然而,由于团聚效应产生传质阻力,会影响CNT的吸附性能。微纤复合材料作为一种新型结构材料,有效克服了这一问题。文中采用化学气相沉积(CVD)法在纸状烧结不锈钢纤维载体(PSSF)表面分别直接生长CNT和硫掺杂碳纳米管(SCNT),成功制备了具有梯度多孔结构的CNT/PSSF和SCNT/PSSF复合材料。通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、热重分析技术(TG)、拉曼光谱(Raman)、傅里叶变换红外光谱仪(FT-IR)和X射线光电子能谱(XPS)对其进行系统表征。固定床反应器中的吸附实验结果表明,SCNT/PSSF因其表面丰富的缺陷和酸碱官能团,展现出优异的动态吸附性能。此外,通过构建由颗粒CNT和SCNT/PSSF组成的结构化固定床,研究了微纤复合材料在二甲苯吸附过程中的传质增强机理。与纯5 cm CNT结构床相比,4 cm CNT+1 cm SCNT/PSSF床层的利用率(ΔZ)提高了8.1%。结构化固定床的吸附过程可以被Yoon-Nelson模型良好拟合。
文摘研究了活性炭固定床对水中苯酚的动态吸附特性及影响因素。结果表明,活性炭对苯酚废水的动态吸附随进水苯酚含量和流量的增大穿透时间缩短,但最大设计体积流量不能超过6.47 m L/min;随固定床高度增加,穿透时间推迟,但最小设计高度不能小于8 cm。无效层厚度随进水流量和固定床高度的增加而增大,随进水苯酚含量增大而减少。经拟合发现实验结果更符合Yoon-Nelson模型,且相关系数都在0.9以上。
文摘研究了CrS@酵母复合吸附剂对阳离子型染料亚甲基蓝的吸附性能,考察了在不同pH值、流速V、床高H、初始浓度c_0条件下对亚甲基蓝染料的吸附效果,以探究最佳吸附条件。结果表明,在溶液pH值为3,流速5 m L/min,床高H=1.5 cm,初始浓度c=50 mg/L时吸附效果最好。采用动力学模型Yoon-Nelson对不同条件下吸附曲线进行分析,相关系数R^2均大于0.9,本次研究结果对于甲基蓝废水的处理具有很重要的参考价值,并且对于我国染料废水的处理可提供借鉴。
