The effect of investor sentiment on stock volatility is a highly attractive research question in both the academic field and the real financial industry.With the proposal of China’s"dual carbon"target,green...The effect of investor sentiment on stock volatility is a highly attractive research question in both the academic field and the real financial industry.With the proposal of China’s"dual carbon"target,green stocks have gradually become an essential branch of Chinese stock markets.Focusing on 106 stocks from the new energy,environmental protection,and carbon–neutral sectors,we construct two investor sentiment proxies using Internet text and stock trading data,respectively.The Internet sentiment is based on posts from Eastmoney Guba,and the trading sentiment comes from a variety of trading indicators.In addition,we divide the realized volatility into continuous and jump parts,and then investigate the effects of investor sentiment on different types of volatilities.Our empirical findings show that both sentiment indices impose significant positive impacts on realized,continuous,and jump volatilities,where trading sentiment is the main factor.We further explore the mediating effect of information asymmetry,measured by the volume-synchronized probability of informed trading(VPIN),on the path of investor sentiment affecting stock volatility.It is evidenced that investor sentiments are positively correlated with the VPIN,and they can affect volatilities through the VPIN.We then divide the total sample around the coronavirus disease 2019(COVID-19)pandemic.The empirical results reveal that the market volatility after the COVID-19 pandemic is more susceptible to investor sentiments,especially to Internet sentiment.Our study is of great significance for maintaining the stability of green stock markets and reducing market volatility.展开更多
Hole transport layers(HTLs)play a vital role in organic solar cells(OSCs).In this work,a derivative of tetrathiafulvalene with four carboxyl groups TTA was introduced as a novel HTL to fabricate OSC with high performa...Hole transport layers(HTLs)play a vital role in organic solar cells(OSCs).In this work,a derivative of tetrathiafulvalene with four carboxyl groups TTA was introduced as a novel HTL to fabricate OSC with high performance.Displaying a better energy level match between HTL and active layers,the TTA based devices show a peak power conversion efficiency of 9.09%,which is comparable to the devices based on PEDOT:PSS.The favorable surface morphology recorded via atomic force microscopy,low series loss and charge recombination indicated by electrochemical impedance spectroscopy,synchronously verify the potential of TTA for application in OSCs as a valid kind of HTLs.展开更多
This paper reports the anti-blast performance of shallow-buried prefabricated modular tunnel reinforced by basalt fiber-reinforced polymer(BFRP)-steel bars.Three concrete arch members with steel bars and three concret...This paper reports the anti-blast performance of shallow-buried prefabricated modular tunnel reinforced by basalt fiber-reinforced polymer(BFRP)-steel bars.Three concrete arch members with steel bars and three concrete arch members with BFRP-steel bars were fabricated,with the other arch parameters kept constant.The three identical arches were assembled into an integral structure and then buried in soil for field anti-blast experiments.Through the experiment,the pressure on the vault,the displacement and acceleration of the vault,the strain in the reinforcement bars and the macroscopic damage of the arches under the blast load were determined.To evaluate the damage of the arch tunnel,a residual load-bearing capacity test was conducted on the arch members after the explosion experiment.The experimental results showed that the BFRP-steel bars reinforced concrete arch exhibited a higher load-bearing capacity and more safety redundancy than the steel bars reinforced concrete arch,and that the BFRP-steel bars could inhibit the occurrence of concrete cracks to a certain extent.A comparison between the arches assembled at different positions showed that the prefabricated modular tun-nel can be simplified directly as a two-dimensional arch structure under the blast load for analysis and calculation.展开更多
基金supported by the National Natural Science Foundation of China(72171005),to which we are deeply grateful。
文摘The effect of investor sentiment on stock volatility is a highly attractive research question in both the academic field and the real financial industry.With the proposal of China’s"dual carbon"target,green stocks have gradually become an essential branch of Chinese stock markets.Focusing on 106 stocks from the new energy,environmental protection,and carbon–neutral sectors,we construct two investor sentiment proxies using Internet text and stock trading data,respectively.The Internet sentiment is based on posts from Eastmoney Guba,and the trading sentiment comes from a variety of trading indicators.In addition,we divide the realized volatility into continuous and jump parts,and then investigate the effects of investor sentiment on different types of volatilities.Our empirical findings show that both sentiment indices impose significant positive impacts on realized,continuous,and jump volatilities,where trading sentiment is the main factor.We further explore the mediating effect of information asymmetry,measured by the volume-synchronized probability of informed trading(VPIN),on the path of investor sentiment affecting stock volatility.It is evidenced that investor sentiments are positively correlated with the VPIN,and they can affect volatilities through the VPIN.We then divide the total sample around the coronavirus disease 2019(COVID-19)pandemic.The empirical results reveal that the market volatility after the COVID-19 pandemic is more susceptible to investor sentiments,especially to Internet sentiment.Our study is of great significance for maintaining the stability of green stock markets and reducing market volatility.
基金partially supported by the National Natural Science Foundation of China(No.51672288)support of Youth Innovation Promotion Association of Chinese Academy of Sciences+2 种基金Major Program of Shandong Province Natural Science Foundation(No.ZR2017ZB0313)Dalian National Laboratory For Clean Energy(DICP QIBEBT No.UN201705)Open Foundation of Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province.
文摘Hole transport layers(HTLs)play a vital role in organic solar cells(OSCs).In this work,a derivative of tetrathiafulvalene with four carboxyl groups TTA was introduced as a novel HTL to fabricate OSC with high performance.Displaying a better energy level match between HTL and active layers,the TTA based devices show a peak power conversion efficiency of 9.09%,which is comparable to the devices based on PEDOT:PSS.The favorable surface morphology recorded via atomic force microscopy,low series loss and charge recombination indicated by electrochemical impedance spectroscopy,synchronously verify the potential of TTA for application in OSCs as a valid kind of HTLs.
基金supported by the Natural Science Foundation of China(51672288 and 21975273)Taishan Scholars Program of Shandong Province+2 种基金Youth Innovation Promotion Association of Chinese Academy of Sciences,Dalian National Laboratory for Clean Energy(DICP QIBEBT UN201705)Scientific Research Cooperation Foundation of Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciencesthe support of Qingdao Postdoctoral Application Research Project(2018183 and 2018186)。
基金Supports from the Natural Science Foundations of Jiangsu Province(Grant No.BK20190573)General Project of Social Development in Jiangsu Province(Grant No.BE2020716)the National Natural Science Foundation of China(Grant No.51778622).
文摘This paper reports the anti-blast performance of shallow-buried prefabricated modular tunnel reinforced by basalt fiber-reinforced polymer(BFRP)-steel bars.Three concrete arch members with steel bars and three concrete arch members with BFRP-steel bars were fabricated,with the other arch parameters kept constant.The three identical arches were assembled into an integral structure and then buried in soil for field anti-blast experiments.Through the experiment,the pressure on the vault,the displacement and acceleration of the vault,the strain in the reinforcement bars and the macroscopic damage of the arches under the blast load were determined.To evaluate the damage of the arch tunnel,a residual load-bearing capacity test was conducted on the arch members after the explosion experiment.The experimental results showed that the BFRP-steel bars reinforced concrete arch exhibited a higher load-bearing capacity and more safety redundancy than the steel bars reinforced concrete arch,and that the BFRP-steel bars could inhibit the occurrence of concrete cracks to a certain extent.A comparison between the arches assembled at different positions showed that the prefabricated modular tun-nel can be simplified directly as a two-dimensional arch structure under the blast load for analysis and calculation.
基金supported by the National Natural Science Foundation of China(21975273,21801014,21773012,and U2032112)Shandong Provincial Natural Science Foundation(ZR2021QE191)+3 种基金the Scientific Research Starting Foundation of Outstanding Young Scholar of Shandong Universitythe Future Young Scholars Program of Shandong Universitythe Fundamental Research Funds of Shandong Universitysupported by the Analysis&Testing Center of Beijing Institute of Technology。