人才红利下的金融科技上市企业效率测度研究——基于双市场网络模型的实证分析

趁着科技创新的东风,近年来,金融科技行业在产品市场中的规模不断增长。然而,其在金融市场的表现却并非一帆风顺。同时,在人才资源的大量倾斜下,该行业内的上市企业表现是否差强人意?为评估金融科技上市企业在两个市场中的不平衡表现,本文首先构建了包含产品市场与金融市场的双市场网络模型;其次,提出了传统型与复合型人才红利下的双市场网络效率测度方法,并对2014—2018年间金融科技上市企业效率进行了测度分析。研究发现,金融科技上市企业传统型双市场网络效率较高,且呈上升态势,而复合型双市场网络效率表现平平;国有企业的传统型双市场网络效率领先于非国有企业;东部地区的传统型效率明显高于中部和西部地区,而在复合型效率中,东部地区出现下滑,中西部的一些省份不降反升。同时,金融科技上市企业也表现出对人才红利的强依赖性。最后,根据结论提出了相关的政策建议。

Overall efficiency optimization of controllable mechanical turbo-compounding system for heavy duty diesel engines

A controllable mechanical turbo-compounding(CMTC) system including continuously variable transmission(CVT) and power turbine bypass valve is proposed to recover waste heat from engine exhaust. The combined matching principle considering swallowing capacity of both charging turbine and power turbine, main gear ratio is investigated at first based on the analysis of individual influence. Then the effects and strategies of CVT and power turbine bypass valve are studied for better performance under off-design conditions. At last, the transient response of intake pressure of engine with CMTC system is researched and the fuel saving potential is tested under driving cycle conditions. The results indicate that the overall fuel efficiency elevates at the off-design conditions if CVT is adopted due to the improvement of power turbine operating efficiency by speed modulation. The diversion of exhaust through power turbine bypass valve under the low load condition is necessary. The back pressure of the charging turbine infuences the transient response of intake pressure for a fixed CMTC configuration. A method featured by the assistance of power turbine bypass valve is tested to improve the transient response of the intake pressure. The fuel consumption reduces by 2% and 3.4% under highway fuel economy test(HWFET) and Tianjin 503(TJ503) driving cycles respectively.