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Resilience Building and Collaborative Governance for Climate Change Adaptation in Response to a New State of More Frequent and Intense Extreme Weather Events

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International Journal of Disaster Risk Science 2023年第1期14卷 162-169页

作者： Huiling Ouyang Xu Tang Renhe Zhang Alexander Baklanov Guy Brasseur Rajesh Kumar Qunli Han yong luo Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric Sciences Fudan UniversityShanghai200438China Fudan Development Institute Fudan UniversityShanghai200433China Integrated Research on Disaster Risk(IRDR)International Centre of Excellence(ICoE)on Risk Interconnectivity and Governance on Weather/Climate Extremes Impact and Public Health Fudan UniversityShanghai200438China Science and Innovation Department World Meteorological Organization(WMO)CH1211GenevaSwitzerland Max Planck Institute for Meteorology 20146HamburgGermany Research Applications Laboratory National Center for Atmospheric ResearchBoulderCO80301USA Integrated Research on Disaster Risk(IRDR)−International Programme Office(IPO) Beijing100094China Ministry of Education Key Laboratory for Earth System Modeling and Department of Earth System ScienceTsinghua UniversityBeijing100084China

The weather conditions of the summer of 2022 were very unusual,particularly in Eastern Asia,Europe,and North America.The devasting impact of climate change has come to our attention,with much hotter and drier conditions,and with more frequent and intense flooding events.Some extreme events have reached a dangerous level,increasingly threatening human lives.The interconnected risks caused by these extreme disaster events are triggering a chain effect,forcing us to respond to these crises through changes in our living environment,which affect the atmosphere,the biosphere,the economy including the availability of energy,our cities,and our global society.Moreover,we have to confront the abnormal consequences of untypical,rapid changes of extreme events and fast switches between extreme states,such as from severe drought to devastating flooding.Recognizing this new situation,it is crucial to improve the adaptation capacity of our societies in order to reduce the risks associated with climate change,and to develop smarter strategies for climate governance.High-quality development must be science-based,balanced,safe,sustainable,and climate-resilient,supported by the collaborative governance of climate mitigation and adaptation.This article provides some recommendations and suggestions for resilience building and collaborative governance with respect to climate adaptation in response to a new planetary state that is characterized by more frequent and severe extreme weather events.

关键词： Climate change adaptation Collaborative governance Extreme weather events Resilience building

Numerical studies of dynamic behavior of liquid film on single-layer wire mesh with different wettabilities

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Frontiers of Chemical Science and Engineering 2022年第11期16卷 1672-1680页

作者： Hai-Long Liao Lan Jiang Hai-Xin Yu Zhi-Hao Liu Ji-Wen Fu Guang-Wen Chu yong luo State Key Laboratory of Organic–Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

Droplet impacting on the stainless steel wire mesh is very common in chemical devices,like a rotating packed bed.Surface wettability of wire mesh significantly affects the liquid flow pattern and liquid dispersion performance.However,the effect of surface wettability on the impaction phenomena at microscale such as liquid film is still unknown.In this work,the dynamic behavior of liquid film on the surface of wire mesh was analyzed by computational fluid dynamics simulation.The dynamic behavior of liquid film on the surface of wire mesh can be divided into the following three steps:(1)spreading step;(2)shrinkage process;(3)stabilizing or disappearing step.Effects of surface wettability,as well as operating conditions,on wetting area and liquid film thickness were studied.Compared to the hydrophilic wire mesh,the final wetting area of hydrophobic wire mesh is zero in most cases.The average liquid film thickness on the surface of hydrophilic wire mesh is 30.02–77.29μm,and that of hydrophobic wire mesh is 41.76–237.37μm.This work provided a basic understanding of liquid film flow at microscale on the surface with various surface wettabilities,which can be guiding the packing optimization and design.

关键词： stainless steel wire mesh computational fluid dynamics surface wettability liquid film impacting

Controllable and high-throughput preparation of microdroplet using an ultra-high speed rotating packed bed

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Chinese Journal of Chemical Engineering 2022年第8期35卷 116-124页

作者： Jing Xie Xiangbi Jia Dan Wang Yingjiao Li Bao-chang Sun yong luo Guang-wen Chu Jian-feng Chen State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

Microdroplets and their dispersion,with a large specific surface area and a short diffusion distance,have been applied in various unit operations and reaction processes.However,it is still a challenge to control the size and size distribution of microdroplets,especially for high-throughput generation.In this work,a novel ultra-high speed rotating packed bed(UHS-RPB)was invented,in which rotating foam packing with a speed of 4000-12000 r·min^(-1) provides microfluidic channels to disperse liquid into microdroplets with high throughput.Then generated microdroplets can be directly dispersed into a continuous falling film for obtaining a mixture of microdroplet dispersion.In this UHS-RPB,the effects of rotational speed,liquid initial velocity,liquid viscosity,liquid surface tension and packing pore size on the average size(d_(32))and size distribution of microdroplets were systematically investigated.Results showed that the UHS-RPB could produce microdroplets with a d_(32) of 25-63μm at a liquid flow rate of 1025 L·h^(-1),and the size distribution of the microdroplets accords well with Rosin-Rammler distribution model.In addi-tion,a correlation was established for the prediction of d_(32),and the predicted d_(32) was in good agreement with the experimental data with a deviation within±15%.These results demonstrated that UHS-RPB could be a promising candidate for controllable preparation of uniform microdroplets.

关键词： Ultra-high speed rotating packed bed Microdroplet Controllable preparation High throughput

On Solution Sequences of the Singular Liouville Equations with an Integral Constraint

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Acta Mathematica Sinica,English Series 2014年第1期30卷 133-150页

作者： yong luo Mathematisches Institut Albert-Ludwigs-Universitat Freiburg

In this paper,we analyze the blow-up behavior of sequences{uk}satisfying the following conditionsΔuk=｜x｜2αk V k eukinΩ,（0.1）whereΩR2,V k→V in C1,｜Vk｜≤A,0

关键词： Singular Liouville equations blow up analysis integral constraint

Preparation of Pd/c-Al_(2)O_(3)/nickel foam monolithic catalyst and its performance for selective hydrogenation in a rotating packed bed reactor

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Chinese Journal of Chemical Engineering 2022年第1期35卷 311-319页

作者： Hai-Long Liao Bao-Ju Wang Ya-Zhao Liu yong luo Jie-Xin Wang Guang-Wen Chu Jian-Feng Chen State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China

Selective hydrogenation plays an important role in chemical industries,yet its selectivity is usually limited by the mass transfer.In this work,the enhanced hydrogenation selectivity was achieved in a rotating packed bed(RPB)reactor with excellent mass transfer efficiency.Aiming to be used under the centrifugal filed,a monolithic catalyst Pd/c-Al_(2)O_(3)/nickel foam suiting for the shape and size of the rotor of RPB reactor was prepared by the electrophoretic deposition method.The mechanical strength of the catalyst can meet the requirement of high centrifugal force in the RPB.The hydrogenation selectivity in the RPB reactor using the 3-methyl-1-pentyn-3-ol hydrogenation system was 3–8 times higher than that in a stirred tank reactor under similar conditions.This work proves the feasibility of intensifying the selectivity of hydrogenation process in the RPB reactor.

关键词： Monolithic catalyst Rotating packed bed reactor Hydrogenation Selectivity

Cartilage-bone inspired the construction of soft-hard composite material with excellent interfacial binding performance and low friction for artificial joints

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Friction 2023年第7期11卷 1177-1193页

作者： Qin CHEN Xinyue ZHANG Siyu LIU Kai CHEN Cunao FENG Xiaowei LI Jianwei QI yong luo Hongtao LIU Dekun ZHANG School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China School of Mechatronic Engineering China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Inspired by the cartilage-bone structure in natural joints,soft-hard integrated materials have received extensive attention,which are the most promising candidates for artificial joints due to their combination of excellent load-bearing properties and lubricating properties.The latest progress showed that the combination of hydrogel and titanium alloy can realize a bionic natural joint lubrication system on the surface of titanium alloy.However,obtaining a tough interface between the hydrogel(soft and wet)and the titanium substrate(hard and dry)is still a great challenge.Here,we designed a"soft(hydrogel)-hard(Ti6Al4V)"integrated material with outstanding combination,which simulates the structure and function of cartilage-bone in the natural joint.The load-bearing properties,binding performance,and tribological behaviors for different forms of the soft-hard integrated materials were investigated.The results showed that the hydrogel layer and Ti6Al4V substrate possess ultra-high interfacial toughness(3,900 J/m^(2)).In addition,the combination of the hydrogel layer and Ti6Al4V substrate provided a good lubrication system to endow the"soft(hydrogel)-hard(Ti6Al4V)"integrated material with high load-bearing and excellent tribological properties.Therefore,this study provided an effective strategy for prolonging the service life of Ti6Al4V in the biomedical field.

关键词： Ti6Al4V alloy hydrogel soft-hard interface friction

Computational fluid dynamic simulation of gas-liquid flow in rotating packed bed:A review

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Chinese Journal of Chemical Engineering 2022年第1期35卷 85-108页

作者： Wen-Cong Chen Ya-Wei Fan Liang-Liang Zhang Bao-Chang Sun yong luo Hai-Kui Zou Guang-Wen Chu Jian-Feng Chen Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China StateKey Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China

The rotating packed bed(RPB)has been widely used in gas-liquid flow systems as a process intensification device,exhibiting excellent mass transfer enhancement characteristics.However,the complex internal structure and the high-speed rotation of the rotor in RPB bring significant challenges to study the intensification mechanism by experiment methods.In the past two decades,Computational fluid dynamics(CFD)has been gradually applied to simulate the hydrodynamics and mass transfer characteristics in RPB and instruct the reactor design.This article covers the development of the CFD simulation of gasliquid flow in RPB.Firstly,the improvement of the simulation method in the aspect of mathematical models,geometric models,and solving methods is introduced.Secondly,new progress of CFD simulation about hydrodynamic and mass transfer characteristics in RPB is reviewed,including pressure drop,velocity distribution,flow pattern,and concentration distribution,etc.Some new phenomena such as the end effect area with the maximum turbulent have been revealed by this works.In addition,the exploration of developing new reactor structures by CFD simulation is introduced and it is proved that such new structures are competitive to different applications.The defects of current research and future development directions are also discussed at last.

关键词： Rotating packed bed Computational fluid dynamics Simulation Hydrodynamics Mass transfer

Evaluation of precipitation extremes over the Tibetan plateau using the NASA global daily downscaled datasets NEX-GDDP-CMIP6

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Advances in Climate Change Research 2023年第6期14卷 884-895页

作者： Hui-Hui YUAN Jian-Bin HUANG Li-Ke NING Florent CATU Jie-Wei ZHOU Chen QIAO Ming YIN yong luo Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijing 100084China Beijing Yanshan Earh Critical Zone National Research Station Universtyf Chinese Academyof Sciences Beijing148 China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China

The utility of statistically downscaled data is in its provision of detailed,high-resolution insights,surpassing global models,which is essential for precise assessments of climate impact.This study delves into the changes in extreme precipitation across the Tibetan Plateau(TP)and its five subregions,thereby deepening our understanding of climate impacts in the region.Employing NASA Earth Exchange Global Daily Downscaled Climate Projections(NEX-GDDP-CMIP6),which are bias-corrected and statistically downscaled,in conjunction with three gauge-based datasets(CN05.1,CMFD,GMFD)spanning from 1979 to 2014,this study conducts an extensive analysis using eight extreme precipitation indices in the TP.The findings reveal significant spatial disparities in extreme precipitation,with the southern subregion experiencing a sig-nificant increase while the two northern subregions show statistically insignificant changes.NEX-GDDP-CMIP6 performs best in the eastern subregion but fails to capture extreme precipitation characteristics in the southern and western subregions.Averaging over the whole period of 1979-2014(climatology),the NEX-GDDP-CMIP6 dataset performs better on the intensity and persistence indices than on the absolute and relative threshold indices.NEX-GDDP-CMIP6's performance on climate trends is significantly below that of climatology.The NEX-GDDP-CMIP6 dataset has limitations over the TP because of its reliance on the underperforming GMFD reference data.This study provides a comprehensive understanding of the variability of extreme precipitation and disparities among different subregions of the TP,laying a robust scientific groundwork for climate impact studies and future projection in this region.

关键词： Extreme precipitation Tibetan Plateau NEX-GDDP-CMIP6 Evaluation

Effects of fastigial nucleus electrical stimulation on lateral ventricle nestin expression after focal cerebral ischemia/reperfusion in adult rats

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Neural Regeneration Research 2008年第4期3卷 410-414页

作者： Yanjun Huang yong luo Department of Neurology First Affiliated Hospital of Chongqing Medical University Chongqing 400016 China Chongqing Key Laboratory of Neurology Chongqing 400016 China Department of Neurology Third People＇s Hospital of Mianyang City Mianyang 621000 Sichuan Province China

BACKGROUND： Previous studies have confirmed that fastigial nucleus electrical stimulation can induce endogenous neuroprotective mechanisms and produce wide and long-lasting neuroprotective effects. Nevertheless, the precise mechanisms remain poorly understood. OBJECTIVE： This study was designed to observe the effects of fastigial nucleus electrical stimulation on nestin-positive cell expression in adult rat lateral ventricle after focal cerebral ischemia/reperfusion, as well as neurological functional changes as a function of time. DESIGN： A randomized controlled animal experiment. SETTING： Department of Neurology, First Affiliated Hospital of Chongqing Medical University; Chongqing Key Laboratory of Neurology. MATERIALS： This study was performed in the Department of Neurology, First Affiliated Hospital of Chongqing Medical University and Chongqing Key Laboratory of Neurology from September 2004 to February 2006. A total of 180 healthy, adult, male Wistar rats, aged 8 weeks old, were provided by the Laboratory Animal Center of Chongqing Medical University. The main reagents and equipments were as follows： rabbit anti-rat nestin monoclonal antibody （Wuhan Boster Company, China）. METHODS： The included male Wistar rats were randomly divided into 5 groups： normal control, sham-operated, model, fastigial nucleus sham-stimulation （sham-stimulation for short）, and fastigial nucleus electrical stimulation （stimulation for short） groups. Six time points （1 hour of ischemia and 1, 3, 7, 14, 21, and 28 days of reperfusion, 6 rats per time point） were allotted to each group. Cerebral ischemia/reperfusion was performed by occlusion to the right middle cerebral artery with suture, followed by suture removal. In the stimulation group, subsequent to reperfusion, the rat left cerebellar fastigial nucleus was immediately subjected to 1 hour of stimulation. After anesthesia, the rat left cerebellar fastigial nucleus was stimulated for 1 hour using a square-wave electronic stimulator with a current intensity of 50 μ A, frequency of

关键词： fastigial nucleus electrical stimulation focal cerebral ischemia/reperfusion nestin lateralventricle rats