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Effect of internal bubbly flow on pipe vibrations

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Science china(Technological Sciences) 2010年第2期53卷 423-428页

作者： zhang MingMing & xu {2. {3. of engineering thermophysics, Chinese academy of Sciences, beijing 100190, china 1. institute of engineering {2. Chinese Academy of Sciences Beijing 100190 China

This paper presents an experimental investigation on wall vibrations of a pipe due to injection of a uniform bubble cloud into the pipe flow. For different bubble void fractions and averaged bubble sizes, the vibrations were measured using accelerometers. To understand the underlying physics, the evolution of the vibration spectra along the streamwise direction was examined. Results showed that wall vibrations were greatly enhanced up to 2. dB, compared with no bubble case. The characteristics of the vibration were mainly dependent on void fraction. These vibrations were believed to be caused by two mechanisms: acoustic resonance and normal modes of the bubble cloud. The former, originating from the interaction between the first mode of the bubble cloud and the first acoustic mode of the pipe, persisted along the entire pipe to enhance the vibration over a broad band frequency range, while the later, due to the process of bubble formation, successively decayed in the streamwise direction.

关键词： pipe vibration bubbly flow acoustic resonance normal mode decay rate

Latest Scientific Results of china's Lunar and Deep Space Exploration(2.2.–2.2.)

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空间科学学报 2024年第4期44卷 622-632页

作者： xu Lin LI lei LIU {2. LIN Honglei LI yang LIU yang XIE Lianghai zhang Jinhai QIAO Fuhao HAN Juanjuan ZOU Yongliao General Office of the Lunar and Deep Space Exploration Chinese Academy of SciencesBeijng 100190 State key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190 institute of Geochemistry Chinese Academy of SciencesGuiyang 550081 institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029

china has successfully launched six lunar probes so *** Chang'E-1 to Chang'E-4,they completed the circling,landing and roving exploration,of which Chang'E-4 was the first landing on the far side of the Moon in human ***'E-5 was launched in December 2.2.,bringing back 173. g of lunar soil *** the detailed analysis of the samples,the scientists understand the history of late lunar volcanism,specifically extending lunar volcanism by about 800 million to 1 billion years,and proposed possible *** addition,there are many new understandings of space weathering such as meteorite impacts and solar wind radiation on the ***'s first Mars exploration mission Tianwen-1 was successfully launched in July *** the study of scientific data,a number of important scientific achievements have been made in the topography,water environment and shallow surface structure of *** paper introduces the main scientific achievements of Chang'E-4,Chang'E-5 and Tianwen-1 in the past two years,excluding technical and {3. *** to the large number of articles involved,this paper only introduces part of the results.

关键词： Lunar and deep space exploration of china Chang’E-4 mission Chang’E-5 mission Tianwen-1 mission

Exploring formation mechanism and source attribution of ozone during the 2.19 Wuhan Military World Games:Implications for ozone control strategies

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Journal of Environmental Sciences 2024年第2期136卷 400-411页

作者： lei zhang Lili Wang Runyu Wang Nan Chen Yuan {2. {3. Li Jie Sun Dan Yao Yuesi Wang Minghui Tao {2. Sun institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China University of the Chinese academy of Sciences Beijing 100049China Hubei Ecological Environment Monitoring Center Station Wuhan 430072China Guizhou Research and Designing institute of Environmental Sciences Guizhou Academy of Environmental Science and DesignGuiyang 550081China Jiangsu key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China School of Environment Key Laboratory for Yellow River and Huai River Water Environment and Pollution ControlMinistry of EducationHenan Normal UniversityXinxiang 453007China key Laboratory of Regional Ecology and Environmental Change School of Geography and Information EngineeringChina University of GeosciencesWuhan 430074China

A series of emission reduction measures were conducted in Wuhan,Central china,to ensure good air quality during the 7th Military World Games(MWG)in October *** better understand the implications for ozone(O_(3.)pollution control strategies,we applied integrated analysis approaches based on the de-weathered statistical model,parameterization methods,chemical box model,and positive matrix factorization *** the MWG,concentrations of O_(3.,NO_x,and volatile organic compound(VOCs),OFP(O_(3.formation potential),L_(OH)(OH radical loss rate)were 83.g/m^(3.,43.g/m^(3.,2. ppbv,188μg/m^(3.,and 3.9 s^(-1),respectively,which were 2.%,18%,3.,15%,and 13.lower than pre-MWG values and 6%,3.%,3.%,3.%,and 50%lower than post-MWG values,*** removing meteorological influence,O_(3.and its precursors during the MWG decreased largely compared with post-MWG values,and only O_(3.,NO_(2.,and oxygenated VOCs(OVOCs)declined compared with pre-MWG values,which revealed the emission reduction measures during the MWG played an important role for O_(3.*** six VOCs sources,the mass contributions of biomass burning and solvents usage during the MWG decreased largely compared with pre-MWG values.O_(3.production was sensitive to VOCs and the key species were aromatics,OVOCs,and alkenes,which originated mainly from solvents usage,biomass burning,industrial-related combustion,and vehicle *** O_(3.concentration during the strict control was mainly caused by OVOCs reduction due to biomass burning ***,the O_(3.abatement strategies of Wuhan should be focused on the mitigation of high-reactivity VOCs.

关键词： VOCs Ozone Wuhan Military World Games Source apportionment Relative incremental reactivity Random forest

Chronic administration of triclosan leads to liver fibrosis through hepcidin-ferroportin axis-mediated iron overload

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Journal of Environmental Sciences 2024年第3期137卷 144-154页

作者： Jing Liu Lecong zhang Fang xu Ping zhang {3. Song College of Eco-Environmental engineering Guizhou Minzu UniversityGuiyang 550025China The institute of Karst Wetland Ecology Guizhou Minzu UniversityGuiyang 550025China State key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Triclosan(TCS)has been manufactured as an antibacterial compound for half a ***,it is widely used in various personal care products;however,its potential adverse effects raise a lot of ***,we create a long-term oral administration mouse model and identify the corresponding hepatotoxicity of *** discover that daily intragastric administration of 10 mg/kg TCS to mice for 12.weeks results in severe hepatic *** study displays that hepatic iron increased 18%,2.%and 2.%upon oral TCS treatment for4,8 and 12.weeks,*** by hepatic iron variation,splenic and duodenal iron are increased,which indicates systemic iron *** only excessive iron accumulated in the liver,abnormal hepatic malondialdehyde,prostaglandin synthase 2.and glutathione peroxidase 4 are pointed to *** study uncovers that hepcidin expression increases 7%,10%,4%in serum and 2.4-,4.8-,and 2.3.fold on transcriptional levels upon TCS exposure for 4,8 and 12.weeks,*** together,the mice in the TCS-treated group show disordered systemic iron homeostasis via the upregulated hepatic hepcidin-ferroportin ***,both hepatic iron overload(systemic level)and hepatocyte ferroptosis(cellular level)are accused of TCS-induced liver ***■,an iron scavenger,significantly ameliorates TCS-induced liver *** summary,this study confirms the impact of TCS on liver fibrosis;a critical signal pathway is also *** significance of the current study is to prompt us to reevaluate the“pros and cons”of TCS applications.

关键词： Triclosan Iron metabolism Hepcidin Hepatotoxicity Liver fibrosis

Ionic Liquid-Enhanced Assembly of Nanomaterials for Highly Stable Flexible Transparent Electrodes

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Nano-Micro Letters 2024年第7期16卷 441-455页

作者： Jianmin yang Li Chang Xiqi zhang Ziquan Cao {2. Jiang key Laboratory of Bio-Inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190People’s Republic of China University of Chinese academy of Sciences Beijing 100049People’s Republic of China College of Chemistry and Chemical engineering Chongqing University of TechnologyChongqing 400054People’s Republic of China Binzhou institute of Technology Binzhou 256600People’s Republic of China Nanomics Biotechnology Co. Ltd.HangzhouPeople’s Republic of China

The controlled assembly of nanomaterials has demon-strated significant potential in advancing technological ***,achieving highly efficient and low-loss assembly technique for nanomate-rials,enabling the creation of hierarchical structures with distinctive func-tionalities,remains a formidable ***,we present a method for nanomaterial assembly enhanced by ionic liquids,which enables the fabrication of highly stable,flexible,and transparent electrodes featuring an organized layered *** utilization of hydrophobic and non-volatile ionic liquids facilitates the production of stable interfaces with water,effectively preventing the sedimentation of 1D/2. nanomaterials assembled at the ***,the interfacially assembled nanomaterial monolayer exhibits an alternate self-climbing behavior,enabling layer-by-layer transfer and the formation of a well-ordered MXene-wrapped silver nanowire network *** resulting composite film not only demonstrates exceptional photoelectric performance with a sheet resistance of 9.4Ωsq^(-1) and 93.transmittance,but also showcases remarkable environmental stability and mechanical *** noteworthy is its application in transparent electromagnetic interference shielding materials and triboelectric nanogenerator *** research introduces an innovative approach to manufacture and tailor functional devices based on ordered nanomaterials.

关键词： Ionic liquids Assembly Silver nanowires MXene nanosheets Flexible transparent electrodes

Hydrogen spillover bridged dual nano-islands triggered by built-in electric field for efficient and robust alkaline hydrogen evolution at ampere-level current density

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Nano Research 2024年第6期17卷 5050-5060页

作者： kecheng Tong Liangliang xu Hanxu Yao Xingkun Wang Canhui {3. Fan yang lei Chu Jinwoo Lee Heqing Jiang Minghua Huang School of Materials Science and engineering Ocean University of ChinaQingdao 266100China Department of Chemical and Biomolecular engineering Korea Advanced Institute of Science and Technology(KAIST)291Daejeon 34141Republic of Korea Qingdao New Energy Shandong Laboratory Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China University of Chinese academy of Sciences Beijing 100049China

Employing the alkaline water electrolysis system to generate hydrogen holds great prospects but still poses significant challenges,particularly for the construction of hydrogen evolution reaction(HER)catalysts operating at ampere-level current ***,the unique Ru and RuP_(2.dual nano-islands are deliberately implanted on N-doped carbon substrate(denoted as Ru-RuP_(2./NC),in which a built-in electric field(BEF)is spontaneously generated between Ru-RuP_(2.dual nano-islands driven by their work function *** and theoretical results unveil that such constructed BEF could serve as the driving force for triggering fast hydrogen spillover process on bridged Ru-RuP_(2.dual nano-islands,which could invalidate the inhibitory effect of high hydrogen coverage at ampere-level current density,and synchronously speed up the water dissociation on Ru nano-islands and hydrogen adsorption/desorption on RuP_(2.nano-islands through hydrogen spillover *** a result,the Ru-RuP_(2./NC affords an ultra-low overpotential of 2.8 mV to achieve 1.0 A·cm^(−2.along with the superior stability over 1000 h,holding the great promising prospect in practical applications at ampere-level current *** importantly,this work is the first to advance the scientific understanding of the relationship between the constructed BEF and hydrogen spillover process,which could be enlightening for the rational design of the cost-effective alkaline HER catalysts at ampere-level current density.

关键词： built-in electric field hydrogen spillover dual nano-islands ampere-level current density alkaline hydrogen evolution

Timp1 Deletion Induces Anxiety-like Behavior in Mice

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Neuroscience Bulletin 2024年第6期40卷 732-742页

作者： Xiaotong Wang Wei Zheng Ziyi Zhu Biyu Xing Weijie Yan ke Zhu Lingli Xiao Chaojuan yang Mengping Wei {2. yang Zi-Bing Jin xueyun Bi Chen zhang State key Laboratory of Neurology and Oncology Drug Development Nanjing210000China School of Basic Medical Sciences Wenzhou Medical UniversityWenzhou325035China School of Basic Medical Sciences Beijing Key Laboratory of Neural Regeneration and RepairAdvanced Innovation Center for Human Brain ProtectionBeijing Laboratory of Oral HealthCapital Medical UniversityBeijing100069China beijing institute of Ophthalmology Beijing Tongren Eye CenterBeijing Tongren HospitalCapital Medical UniversityBeijing100005China Chinese institute for Brain Research Beijing102206China key Laboratory for Biomechanics and Mechanobiology of the Ministry of Education Beijing Advanced Innovation Center for Biomedical EngineeringSchool of Engineering MedicineBeihang UniversityBeijing100191China

The hippocampus is essential for learning and memory,but it also plays an important role in regulating emotional behavior,as hippocampal excitability and plasticity affect anxiety and *** synaptic plasticity may be regulated by tissue inhibitor of matrix metalloproteinase 1(TIMP1),a known protein inhibitor of extracellular matrix(ECM),and the expression of TIMP1 in the hippocampus can be induced by neuronal excitation and various ***,the involvement of Timp1 in fear learning,anxiety,and hippocampal synaptic function remains to be *** study of Timp1 function in vivo revealed that Timp1 knockout mice exhibit anxiety-like behavior but normal fear *** results suggested that Timp1 knockout mice showed hyperactivity in the ventral CA1 region,but the basic synaptic transmission and plasticity were normal in the Schaffer collateral *** together,our results suggest that deletion of Timp1 in vivo leads to the occurrence of anxiety behaviors,but that Timp1 is not crucial for fear learning.

关键词： Timp1 Anxiety Fear Synaptic transmission Synaptic plasticity

Simulation of the Ecosystem Productivity Responses to Aerosol Diffuse Radiation Fertilization Effects over the Pan-Arctic during 2.01–19

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Advances in Atmospheric Sciences 2024年第1期41卷 84-96页

作者： Zhiding zhang xu YUE Hao ZHOU Jun ZHU Yadong {2. Chenguang TIAN Jiangsu key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science&Technology(NUIST)Nanjing 210044China Climate Change Research Center Institute of Atmospheric Physics(IAP)Chinese Academy of Sciences(CAS)Beijing 100029China University of Chinese academy of Sciences Beijing 100049China State key Laboratory of Severe Weather&key Laboratory of Atmospheric Chemistry of CMA Chinese Academy of Meteorological SciencesBeijing 100081China

The pan-Arctic is confronted with air pollution transported from lower *** have shown that aerosols help increase plant photosynthesis through the diffuse radiation fertilization effects(DRFEs).While such DRFEs have been explored at low to middle latitudes,the aerosol impacts on pan-Arctic ecosystems and the contributions by anthropogenic and natural emission sources remain less ***,we perform regional simulations at 0.2.×0.2.using a well-validated vegetation model(Yale Interactive terrestrial Biosphere,YIBs)in combination with multi-source of observations to quantify the impacts of aerosol DRFEs on the net primary productivity(NPP)in the pan-Arctic during *** show that aerosol DRFEs increase pan-Arctic NPP by 2.19 Pg C(12.8%)yr^(-1)under clear-sky conditions,in which natural and anthropogenic sources contribute to 8.9% and 3.9%,*** all-sky conditions,such DRFEs are largely dampened by cloud to only 0.2. Pg C(1.2.%)yr^(-1),with contributions of 0.65% by natural and 0.59% by anthropogenic *** aerosols cause a positive NPP trend of 0.02.% yr^(-1)following the increased fire activities in the *** contrast,anthropogenic aerosols induce a negative trend of-0.01% yr^(-1)due to reduced emissions from the middle *** trends in aerosol DRFEs show a turning point in the year of 2.07 with more positive NPP trends by natural aerosols but negative NPP trends by anthropogenic aerosols *** affected by modeling uncertainties,this study suggests a likely increasing impact of aerosols on terrestrial ecosystems in the pan-Arctic under global warming.

关键词： diffuse radiation fertilization effects anthropogenic aerosols natural aerosols pan-Arctic net primary productivity

Ultrathin curved PdNiRu nanosheets as bifunctional catalysts for oxygen reduction and ethylene glycol oxidation

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Nano Research 2024年第5期17卷 3777-3784页

作者： Xianzeng Li Tingyu Lu Huan Pang Mingyi zhang Dongdong xu Lin xu Min Han Jun {3. Jiangsu key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China Fujian Cross Strait institute of Flexible Electronics(Future Technology) Fujian Normal UniversityFuzhou 350117China State key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China State key Laboratory of Coordination Chemistry Nanjing UniversityNanjing 210023China School of Chemistry and Chemical engineering Yangzhou UniversityYangzhou 225009China key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China

Pd-based metallic nanosheets with advanced physicochemical properties have been widely prepared and employed in various electrocatalytic ***,few concerns were focused on their multiple performances in different ***,highly curved and ultrathin PdNiRu nanosheets(NSs)are developed by facile wet-chemistry strategy and exhibit excellent electrocatalytic performance toward both oxygen reduction reaction(ORR)and ethylene glycol oxidation reaction(EGOR).Owing to the synergistically structural(e.g.,ultrathin,curved,defects/steps-rich)and compositional(ternary alloy)advantages,PdNiRu NSs exhibited enhanced ORR and EGOR specific/mass activities and better stability/durability than control *** specific activity(5.52.mA·cm^(−2.)and mass activity(1.13.A·mg_(Pd)^(−1))of the PdNiRu NSs in ORR are 4.8 and 3.4 times as the ones of commercial Pt/C,*** mass activity of PdNiRu NSs(3.86 A·mg_(Pd)^(−1))in EGOR is 2.6 times as commercial Pd/C(1.51 A·mg_(Pd)^(−1)).This study is helpful for the development of desired electrocatalysts with multi-functional application in practical fuel cells.

关键词： ultrathin nanosheets noble metal electrocatalysts bifunctional