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Numerical and experimental study of the effects of wind turbine operation on sand-dust transport characteristics

Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 97-113页

作者： Gaosheng Ma Hong Han Ye Li Deshun Li Yan Wang Ning Fu Quan Zheng Rennian Li School of Energy and Power Engineering Lanzhou University of TechnologyLanzhou 730050China Gansu Provincial Technology center for Wind Turbines Lanzhou 730050China Key Laboratory of Fluid Machinery and Systems Lanzhou 730050China Multiple Function Towing tank Laboratory State Key Laboratory of Ocean EngineeringSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Given factors such as reduced land availability for onshore wind farms,wind resource enrichment levels,and costs,there is a growing trend of establishing wind farms in deserts,the Gobi,and other arid regions.Therefore,the relationship between sanddust weather environments and wind turbine operations has garnered significant attention.To investigate the impact of wind turbine wakes on sand-dust transportation,this study employs large eddy simulation to model flow fields,coupled with an actuator line model for simulating rotating blades and a multiphase particle in cell model for simulating sand particles.The research focuses on a horizontal axis wind turbine model and examines the motion and spatiotemporal distribution characteristics of four typical sizes of sand particles in the turbine wake.The findings reveal that sand particles of varying sizes exhibit a spiral settling pattern after traversing the rotating plane of wind turbine blades,influenced by blade shedding vortex and gravity.Sand particles tend to cluster in the peripheries of the vortex cores of low vorticity in the wind turbine wake.The rotation of wind turbines generates a wake vortex structure that causes a significant clustering of sand particles at the tip vortex.As the wake distance increases,the particles that cluster at the turbine's tip gradually spread outward to approximately twice the rotor diameter and then begin to mix with the incoming flow environment.Wind turbines have a noticeable impact on sand-dust transportation,hindering their movement to a significant extent.The average sand-blocking rate exhibits a trend of initially increasing and then decreasing as the wake distance increases.At its peak,the sand-blocking rate reaches an impressive 67.55%.The presence of wind turbines induces the advanced settling of sand particles,resulting in a“triangular”distribution of the deposition within the ground projection area of the wake.

关键词： wind turbine particle transportation actuator line model dry deposition particle clustering

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A mitochondria-targeted H_(2)S-activatable fluorogenic probe for tracking hepatic ischemia-reperfusion injury

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Chinese Chemical Letters 2024年第6期35卷 370-375页

作者： Bin Fang Jiaqi Yang Limin Wang Haoqin Li Jiaying Guo Jiaxin Zhang Qingyuan Guo Bo Peng Kedi Liu Miaomiao Xi Hua Bai Li Fu Lin Li School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China Frontiers Science center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Key laboratory of Flexible Electronics of Zhejiang Province Ningbo Institute of Northwestern Polytechnical UniversityNingbo 315103China The Institute of Flexible Electronics(IFE Future Technologies)Xiamen UniversityXiamen 361005China Wuhan National Laboratory for Optoelectronics-Advanced Biomedical Imaging Facility Huazhong University of Science and TechnologyWuhan 430074China tank Medicinal Biology Institute of Xi’an Xi’an 710032China

Hepatic ischemia-reperfusion injury(HIRI)is the cause of postoperative hepatic dysfunction and failure,and even death.As an important biological effector molecule,hydrogen sulfide(H_(2)S)of mitochondria as a gasotransmitter that is usually used to protect against acute HIRI injury.However,the exact relationship between HIRI and mitochondrial H_(2)S remains tangled due to the lack of an effective analytical method.Herein,we have fabricated a mitochondria-targeted H_(2)S-activatable fluorogenic probe(Mito-GW)to explore the stability of mitochondrial H_(2)S and track the changes of mitochondrial H_(2)S during the HIRI.By virtue of pyridinium electropositivity and its amphiphilicity,Mito-GW could accumulate in mitochondria.It goes through an analyte-prompted immolation when reacts with H_(2)S,resulting in the releasing of the fluorophore(GW).Therefore,the extent of Mito-GW conversion to GW can be used to evaluate the changes of mitochondrial H_(2)S level in living cells and tissues.As proof-of-principle,we have used MitoGW to demonstrate the mitochondria H_(2)S-levels increase and then decrease during HIRI in vitro and in vivo.Our research highlights the tremendous potential of Mito-GW as a mitochondrial H_(2)S fluorogenic probe in elucidating the pathogenesis of HIRI,providing a powerful tool for promoting future research on hepatology.

关键词： Mitochondria-targeted Bioimaging H2S-activatable Fluorogenic probe Hepatic ischemia-reperfusion injury(HIRI)

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A Close-Up Look at New Trends

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Beijing Review 2022年第31期65卷 26-28页

作者： Henry Huiyao Wang Mabel Lu Miao the center for China and Globalization the think tank

In the decade before the COVID-19 pandemic ravaged the world, delegations from the center for China and Globalization(CCG) had visited counterparts across the Pacific in the U.S. at least twice a year. However, the un... 详细信息

关键词： delegation before exchanges

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Comparison and analysis of mitigation ambitions of Parties’ updated Nationally Determined Contributions

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Advances in Climate Change Research 2023年第1期14卷 4-12页

作者： Hai-Lin WANG Yu-Yan WENG Xun-Zhang PAN Institute of Energy Environment and EconomyTsinghua UniversityBeijing 100084China think tank center Tsinghua UniversityBeijing 100084China School of Economics and Management China University of PetroleumBeijing 102249China

Understanding mitigation ambitions of the Nationally Determined Contributions(NDCs)should include both the equity of supporting the Paris Agreement goals and the costs of achieving the proposed mitigation targets.This study presents a new framework that combines equity and economic costs to compare and analyze mitigation ambitions of Parties'updated NDCs.Under representative 2℃ and 1.5℃ pathways,this framework uses multiple equity-principled allocations to derive the alignment of the updated NDCs with the Paris Agreement goals,and further applies a computable general equilibrium model to assess the economic costs of implementing the updated NDCs.The results show that global 2030 emissions may meet the selected global 2℃ pathway if all Parties achieve their most ambitious mitigation efforts,but there is still an emissions gap of 10-15 GtCO_(2) to follow the selected 1.5℃ pathway.From the perspective of equity,the updated NDCs of the USA,the EU(including the UK in this study),and Japan lack ambition with respect to‘equal cumulative per capita emissions’under 2℃ and do not align with any equity principles under 1.5℃.The updated NDCs of China,India,Brazil and South Africa reflect their claims to‘equity’and‘common but differentiated responsibilities’.From the perspective of economic costs,the GDP and welfare losses of China,Brazil and South Africa incurred by achieving the updated NDCs are not lower than those of the three developed Parties.China's GDP loss is estimated at 0.43%-0.55%in 2030,which is higher than that of the USA(0.30%-0.38%)and the EU(0.25%-0.28%).This study suggests that developed Parties take the lead in further ratcheting up the NDCs and strengthen financial and technological support to developing countries so that the world could close the gap to 1.5℃.

关键词： Updated NDCs 2030 emissions Equity Economic costs Paris Agreement

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A Landmark in Cooperation and Multilateralism

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Beijing Review 2022年第51期65卷 22-23页

作者： He Weiwen the center for China and Globalization think tank

The world witnessed significant bilateral and multilateral diplomatic activities in Riyadh,capital of Saudi Arabia on December 7-10,namely,the state visit of Chinese President Xi Jinping to Saudi Arabia,the First Chin... 详细信息

关键词： witnessed bilateral visit

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Determination of the constant m_(i) in the Hoek-Brown criterion of rock based on drilling parameters

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International Journal of Mining Science and Technology 2022年第4期32卷 747-759页

作者： Haoteng Wang Mingming He Zhiqiang Zhang Jiwei Zhu State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi’an University of TechnologyXi’an 710048China Shaanxi Key Laboratory of Loess Mechanics and Engineering Xi’an University of TechnologyXi’an 710048China Research center of Eco-hydraulics and Sustainable Development The New Style Think Tank of Shaanxi UniversitiesXi’an 710048China

The constant m_(i) in the Hoek-Brown(H-B) criterion is a fundamental parameter required for determining the compressive strength of rock. In this paper, drilling parameters provide a new basis for determining the constant mi. An analytical relationship between the drilling parameters and constant miis established in consideration of the contact response between the drilling bit and the cut rock in the crushed zone.New models are developed to predict the triaxial compressive strength(TCS), internal friction angle φand cohesion c of rock. Drilling tests are carried out on 6 rock types to study the correlation between φ and m_(i). A comparison between the predicted values of rock mechanical properties and the measured values from the laboratory is performed to verify the accuracy of the proposed model(yielding an error less than 10%). The TCSs and constant m_(i) values of fifteen rocks are cited to validate the accuracy of the proposed model. The result shows that the proposed model predicts the TCS and constant m_(i) within a maximum error of 20%. The method can be conveniently applied to the rock mechanical properties.

关键词： Constant miin the H-B criterion Analytical model Friction angle Drilling parameters Triaxial compressive strength

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Developing a novel quantitative parameter for characterizing spatial distribution of fish following exposure to chemicals and wastewater:Behavioral Gini coefficient

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Journal of Environmental Sciences 2024年第7期141卷 129-138页

作者： Xuanyue Chen Yuanyuan Li Zhanfen Qin State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

While the spatial distribution pattern of fish is increasingly used for toxicological test o chemicals or wastewater,no ideal parameter is available for quantitative assessment of spa tial distribution,especially uneven distribution with multiple hotspots.Here,to develop a quantitative assessment parameter for spatial distribution,the zebrafish were exposed to ethanol,pentylenetetrazole(PTZ),paraquat dichloride(paraquat)and wastewater,followed by a behavioral test in a narrow tank.Behavioral data was acquired and analyzed by id Tracker and MATLAB.By comparing the effects of all treatments on behavior parameters we confirmed that the spatial distribution was more easily altered rather than general loco motor parameters,e.g.0.7-70 mg/L PTZ and 5-20 mg/L paraquat being effective for altering spatial distribution but having little effects on general locomotor parameters.Based on the heatmap,i.e.,the cumulative proportion of grids and that of frequency in grids,we calcu lated the behavioral Gini coefficient(G_(b))for quantitative assessment of fish spatial distri bution.The Gini coefficient ranged from zero to 1,with larger values meaning poorer even ness of spatial distribution.Of note,G_(b)showed smaller coefficient of variations(CV)with3%-19%between replicate tanks in all treatments than the highest frequency(4%-79%),dis playing well robustness.Especially,G_(b)addressed the challenge of the complicated heatmap with multiple hotspots.Overall,the behavioral Gini coefficient we established is an idea parameter to quantitatively assess spatial distribution of fish shoal,which is expected to be applied in toxicity testing for chemicals and wastewater and automatic quality monitoring for surface water and aquaculture water.

关键词： Zebrafish Behavioral test Spatial distribution Behavioral Gini coefficient

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钟摆:中国旧住区改造的70年演进历程

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城市规划:英文版 2023年第3期32卷 75-83页

作者：冉奥博刘佳燕 Li Min(Translated) Liang Sisi(Proofread) think tank center Institute for Urban Governance and Sustainable DevelopmentTsinghua University School of Architecture Tsinghua University 不详

Old residential area regeneration has long been integral to China's urban planning,construction,and governance.This paper divides its history in China into four periods based on the policy and its positioning in the socio-economic pattern:slow development as a non-productive sector(1949to late 1970s),housing marketization under unified planning(late 1970s to early 2000s),a livelihood-oriented transitional period(early 2000s to early 2010s),and a large-scale comprehensive project(early 2010s to the present).It summarizes the positioning,purpose,type,actor,and research characteristics in each period and points out that the old residential area regeneration in China has always been in dynamic interaction between the state,market,and society,presenting complicated characteristics.This process is like a pendulum oscillating between the dual attributes of urban regeneration and housing policies,and relevant studies exploring the Chinese path since 1949 are featured by pragmatism and policy implication.

关键词： old residential area regeneration evolution China old community

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Explosion Hazard Analysis of Liquefied Petroleum Gas Transportation

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Journal of Shanghai Jiaotong university(Science) 2024年第2期29卷 252-260页

作者：高思达郝琳朱振兴卫宏远 School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China National Engineering Research center for Petroleum Refining Technology and Catalyst Beijing 100083China

This paper presents a quantitative risk analysis of liquefied petroleum gas(LPG)transportation.An accident that happened on June 13,2020,on the highway near Wenling,China is studied as a case.In this accident,LPG carried by a tank truck on the highway leaked and caused a large explosion,which led to 20 deaths.Different methods are combined to calculate the consequence of the accident.Multi-energy model and rupture of vessel model are employed to calculate the overpressure;the simulation result of the multi-energy model is closer to the damage caused by the accident.The safety distances in accidents of LPG transport storage tanks of different capacities are calculated in this study;the results show that the damage of explosion will increase with the filling degree of the tank.Even though the filling degree is 90%(value required by law),the 99%fatality rate range will reach 42 m,which is higher than regulated distance between road and building.The social risk of the tank truck has also been calculated and the results show that the risk is not acceptable.The calculating method used in this study could evaluate the risk of LPG tanker more accurately,which may contribute to the establishment of transportation regulation so that losses from similar accidents in the future could be reduced.

关键词： liquefied petroleum gas(LPG) quantitative risk analysis explosion consequence calculation

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Analysis in Results Production Mode of Chinese Media Type think-tank

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Macro Management & Public Policies 2020年第4期2卷 14-19页

作者： Meng Chen Jiangsu center Xinhua think tank

Purpose/Significance:Through the analysis in the results production mode of the Chinese media type think-tank based on the media operation structure and communication platform,found there are structure and cooperation problems of spread and research line,team cooperation and transformation problem of research and spread,research production and media production positioning problem,and spread channel widening problem,this paper tries to provide a useful suggestions for the current traditional media transformation encourage the media type think tank go abroad,raise the international influence,personalize the products,make it into Boutique,become a brand and the development strategy of the new think-tank with Chinese characteristics.Methods/Processes:analysis the results production model of media-based think tank from four aspects:category,characteristics,existing problems and development trend.Results/conclusion:the achievements of Chinese media-based think tanks will follow a new development trend through the establish of cooperative innovation system,achievements make and press system of“all media tendency”,market-oriented transformation theory,brand strategy,and exerting international influence.

关键词： think tank Media think-tank achievements Production model

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