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| 1 | Enhanced secondary pollution offset reduction of primary emissions during COVID-19 lockdown in China显示文摘To control the spread of the 2019 novel coronavirus(COVID-19),China imposed nationwide restrictions on the movement of its population(lockdown)after the Chinese New Year of 2020,leading to large reductions in economic activities and associated emissions.Despite such large decreases in primary pollution,there were nonetheless several periods of heavy haze pollution in eastern China,raising questions about the well-established relationship between human activities and air quality.Here,using comprehensive measurements and modeling,we show that the haze during the COVID lockdown was driven by enhancements of secondary pollution.In particular,large decreases in NOx emissions from transportation increased ozone and nighttime NO_(3)radical formation,and these increases in atmospheric oxidizing capacity in turn facilitated the formation of secondary particulate matter.Our results,afforded by the tragic natural experiment of the COVID-19 pandemic,indicate that haze mitigation depends upon a coordinated and balanced strategy for controlling multiple pollutants. | Xin Huang Aijun Ding Jian Gao Bo Zheng Derong Zhou Ximeng Qi Rong Tang Jiaping Wang Chuanhua Ren Wei Nie Xuguang Chi Zheng Xu Liangduo Chen Yuanyuan Li Fei Che Nini Pang Haikun Wang Dan Tong Wei Qin Wei Cheng Weijing Liu Qingyan Fu Baoxian Liu Fahe Chai Steven JDavis Qiang Zhang Kebin He | 2021 | National Science Review2021，8，2： | 47 |
| 2 | Electrochromic-Induced Rechargeable Aqueous Batteries: An Integrated Multifunctional System for Cross-Domain Applications显示文摘Multifunctional electrochromic-induced rechargeable aqueous batteries(MERABs) integrate electrochromism and aqueous ion batteries into one platform, which is able to deliver the conversion and storage of photo-thermal-electrochemical sources.Aqueous ion batteries compensate for the drawbacks of slow kinetic reactions and unsatisfied storage capacities of electrochromic devices. On the other hand, electrochromic technology can enable dynamically regulation of solar light and heat radiation. However,MERABs still face several technical issues, including a trade-off between electrochromic and electrochemical performance, low conversion efficiency and poor service life. In this connection, novel device configuration and electrode materials, and an optimized compatibility need to be considered for multidisciplinary applications. In this review,the unique advantages, key challenges and advanced applications are elucidated in a timely and comprehensive manner. Firstly, the prerequisites for effective integration of the working mechanism and device configuration, as well as the choice of electrode materials are examined. Secondly, the latest advances in the applications of MERABs are discussed, including wearable, self-powered, integrated systems and multisystem conversion. Finally, perspectives on the current challenges and future development are outlined, highlighting the giant leap required from laboratory prototypes to large-scale production and eventual commercialization. | Qi Zhao Zhenghui Pan Binbin Liu Changyuan Bao Ximeng Liu Jianguo Sun Shaorong Xie Qing Wang John Wang Yanfeng Gao | 2023 | Nano-Micro Letters2023，15，6： | 2 |
| 3 | Modeling and Parameter Sensitivity Analysis of Valve‑Controlled Helical Hydraulic Rotary Actuator System显示文摘As a type of hydraulic rotary actuator,a helical hydraulic rotary actuator exhibits a large angle,high torque,and compact structure;hence,it has been widely used in various fields.However,its core technology is proprietary to several companies and thus has not been disclosed.Furthermore,the relevant reports are primarily limited to the component level.The dynamic characteristics of the output when a helical rotary actuator is applied to a closed-loop system are investigated from the perspective of driving system design.Two main aspects are considered:one is to establish a reliable mathematical model and the other is to consider the effect of system parameter perturbation on the output.In this study,a detailed mechanical analysis of a helical rotary hydraulic cylinder is first performed,factors such as friction and load are considered,and an accurate dynamic model of the actuator is established.Subsequently,considering the nonlinear characteristics of pressure flow and the dynamic characteristics of the valve,a dynamic model of a valve-controlled helical rotary actuator angle closed-loop system is described based on sixth-order nonlinear state equations,which has never been reported previously.After deriving the system model,a sensitivity analysis of 23 main parameters in the model with a perturbation of 10%is performed under nine operating conditions.Finally,the system dynamics model and sensitivity analysis results are verified via a prototype experiment and co-simulation,which demonstrate the reliability of the theoretical results obtained in this study.The results provide an accurate mathematical model and analysis basis for the structural optimization or control compensation of similar systems. | Kun Zhang Junhui Zhang Minyao Gan Huaizhi Zong Ximeng Wang Hsinpu Huang Qi Su Bing Xu | 2022 | Chinese Journal of Mechanical Engineering2022，35，6： | 1 |
| 4 | Comparing the effects of three decoctions for coronavirus disease 2019 on severe acute respiratory syndrome coronavirus 2-related toll-like receptors-mediated inflammations显示文摘OBJECTIVE:To compare the anti-inflammatory effects of three decoctions for coronavirus disease 2019(COVID-19)[Qingfei Paidu Tang(清肺排毒汤),QF;Huashi Baidu Fang(化湿败毒方),HS;Xuanfei Baidu Fang(宣肺败毒方),XF]in parallelly experimental models by using severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)-related toll-like receptors(TLRs)ligands and its spike(S)protein as stimulators.METHODS:RAW264.7 macrophages were used to investigate the effects of three decoctions on the inflammations induced by R848,poly(I:C),lipopolysaccharide(LPS),as well as SARS-CoV-2 S protein,in vitro.Mouse endotoxemia model was used for evaluating their anti-inflammatory actions in vivo.The levels of monocyte chemoattractant protein-1(MCP-1),interleukin-6(IL-6),tumor necrosis factorα(TNF-α),and interferon-β(IFN-β)were determined by enzyme-linked immunosorbent assay.RESULTS:Three decoctions could decrease supernatant IL-6,MCP-1,nitric oxide(NO)and TNF-αto varying degrees in activated macrophages.Meanwhile,they did not increase the level of antiviral cytokine IFN-βinduced by TLR3 and TLR4 ligands,but rather suppressed it,suggesting that externally administrated type I interferons(IFN-Is)may be needed for the severe COVID-19 cases characterized by deficient IFN-Is.In mouse endotoxemia model,all three decoctions could suppress serum pro-inflammatory cytokines,but only QF could relieve hypothermia and antagonize diarrhea.CONCLUSIONS:Collectively,our study compared,for the first time,the effects of three decoctions on SARSCoV-2-related TLRs-mediated inflammations.In vitro,three decoctions exert similar suppressive effects on inflammatory cytokines induced by SARS-CoV-2-related TLRs ligands,as well as S protein.In vivo,QF possesses the strongest effects compared with HS and XF.These findings may provide not only experimental basis for the clinical use of three decoctions,but also a rationale for the combination therapy with IFN-Is. | LI Ximeng KANG Yuan LI Wenjing LIU Zhuangzhuang XU Zhenlu ZHANG Xiaoyu CAI Runlan GAO Yuan QI Yun | 2023 | Journal of Traditional Chinese Medicine2023，43，1： | 1 |
| 5 | Frameworked electrolytes:Ionic transport behavior and high mobility for solid state batteries显示文摘All solid-state batteries(ASSBs)are the holy grails of rechargeable batteries,where extensive searches are ongoing in the pursuit of ideal solid-state electrolytes.Nevertheless,there is still a long way off to the satisfactorily high(enough)ionic conductivity,long-term stability and especially being able to form compatible interfaces with the solid electrodes.Herein,we have explored ionic transport behavior and high mobility in the sub-nano pore networks in the framework structures.Macroscopically,the frameworked electrolyte behaves as a solid,and however in the(sub)-nano scales,the very limited number of solvent molecules in confinement makes them completely different from that in liquid electrolyte.Differentiated from a liquid-electrolyte counterpart,the interactions between the mobile ions and surrounding molecules are subject to dramatic changes,leading to a high ionic conductivity at room temperature with a low activation energy.Li+ions in the sub-nano cages of the network structure are highly mobile and diffuse rather independently,where the rate-limiting step of ions crossing cages is driven by the local concentration gradient and the electrostatic interactions between Li^(+)ions.This new class of frameworked electrolytes(FEs)with both high ionic conductivity and desirable interface with solid electrodes are demonstrated to work with Li-ion batteries,where the ASSB with LiFePO_(4)shows a highly stable electrochemical performance of over 450 cycles at 2℃ at room temperature,with an almost negligible capacity fade of 0.03‰ each cycle.In addition,the FE shows outstanding flexibility and anti-flammability,which are among the key requirements of large-scale applications. | Jianguo Sun Hao Yuan Jing Yang Tuo Wang Yulin Gao Qi Zhao Ximeng Liu Haimei Wang Yong-Wei Zhang John Wang | 2024 | InfoMat2024，6，2： | 0 |
| 6 | Response of organic aerosol characteristics to emission reduction in Yangtze River Delta region显示文摘Organic aerosol(OA)is a major component of atmospheric particulate matter(PM)with complex composition and formation processes influenced by various factors.Emission reduction can alter both precursors and oxidants which further affects secondary OA formation.Here we provide an observational analysis of secondary OA(SOA)variation properties in Yangtze River Delta(YRD)of eastern China in response to large scale of emission reduction during Chinese New Year(CNY)holidays from 2015 to 2020,and the COVID-19 pandemic period from January to March,2020.We found a 17%increase of SOA proportion during the COVID lockdown.The relative enrichment of SOA is also found during multi-year CNY holidays with dramatic reduction of anthropogenic emissions.Two types of oxygenated OA(OOA)influenced by mixed emissions and SOA formation were found to be the dominant components during the lockdown in YRD region.Our results highlight that these emission-reduction-induced changes in organic aerosol need to be considered in the future to optimize air pollution control measures. | Jinbo Wang Jiaping Wang Wei Nie Xuguang Chi Dafeng Ge Caijun Zhu Lei Wang Yuanyuan Li Xin Huang Ximeng Qi Yuxuan Zhang Tengyu Liu Aijun Ding | 2023 | Frontiers of Environmental Science & Engineering2023，17，9： | 0 |
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