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State-owned Enterprises in China as Macroeconomic Stabilizers: Their Special Function in Times of Economic Policy Uncertainty 被引量:1
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作者 mingyue fang Rui Ruan 《China & World Economy》 2023年第5期87-115,共29页
China has many state-owned enterprises(SOEs)and they have accounted for a large proportion of China's GDP over the last four decades.China's rapid growth contradicts literature that focuses on the inefficiency... China has many state-owned enterprises(SOEs)and they have accounted for a large proportion of China's GDP over the last four decades.China's rapid growth contradicts literature that focuses on the inefficiency of SOEs.This study shows that,in periods of economic policy uncertainty(EPU),SOEs have performed a special function as"macroeconomic stabilizers."Using Chinese listed firm data from 2008 to 2019,we investigate five aspects of SOEs'unique functions as macroeconomic stabilizers:employment,investment,growth,financial operation,and expectations.When EPU increased,SOEs had more employment,higher investment expenditure,lower performance volatility,more robust financial structures,and more stable expectations than private firms.We employ the US-China trade war as an exogenous shock on EPU to conduct a difference-in-difference-in-differences approach to mitigate the problem of potentially omitted variables.The findings of this study provide a new perspective to better explain the functions of SOEs in the 21st century. 展开更多
关键词 China economic policy uncertainty EMPLOYMENT investment state-owned enterprise
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哺乳动物细胞灌流培养工艺开发与优化 被引量:4
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作者 张琼琼 方明月 +1 位作者 栗军杰 曹荣月 《生物工程学报》 CAS CSCD 北大核心 2020年第6期1041-1050,共10页
近年来生物药市场需求量激增,高产量、高质量、低成本的哺乳动物细胞灌流培养工艺顺势成为工业界和学术界普遍关注的热点。文中围绕灌流培养工艺特有的操作环节及工艺优化应着重关注的细节展开论述,综述了近年来在灌流培养工艺开发和优... 近年来生物药市场需求量激增,高产量、高质量、低成本的哺乳动物细胞灌流培养工艺顺势成为工业界和学术界普遍关注的热点。文中围绕灌流培养工艺特有的操作环节及工艺优化应着重关注的细节展开论述,综述了近年来在灌流培养工艺开发和优化上取得的进步和提出的策略,以期为哺乳动物细胞灌流培养技术的开发提供参考。 展开更多
关键词 灌流培养 单细胞灌流速率 中空纤维柱 滤膜堵塞
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