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Effects of retained dry material on the impact,overflow and landing dynamics

Journal of Rock Mechanics and Geotechnical engineering 2024年第9期16卷 3629-3640页

作者： Jun Fang Yifei Cui Haiming Liu State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijingChina Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong KongChina

During long-term operation,the performance of obstacles would be changed due to the material accumulating upslope the ***,the effects of retained material on impact,overflow and landing dynamics of granular flow have not yet been *** address this gap,physical flume tests and discrete element simulations are conducted considering a range of normalized deposition height h0/H from 0 to 1,where h0 and H represent the deposition height and obstacle height,*** analytical model is modified to evaluate the flow velocity and flow depth after interacting with the retained materials,which further serve to calculate the peak impact force on the ***,the computed impact forces successfully predict the experimental results when a≥25°.In addition,the results indicate that a higher h0/H leads to a lower dynamic impact force,a greater landing distance L,and a larger landing coefficient Cr,where Cr is the ratio of slope-parallel component of landing velocity to flow velocity just before *** to the existing overflow model,the measured landing distance L is underestimated by up to 30%,and therefore it is insufficient for obstacle design when there is retained ***,the recommended Cr in current design practice is found to be nonconservative for estimating the landing velocity of geophysical *** study provides insightful scientific basis for designing obstacles with deposition.

关键词： Granular flow Obstacle deposition Impact Overflow Landing

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Bioaccessibility and health risk assessment of hydrophobic organic pollutants in soils from four typical industrial contaminated sites in China

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Journal of environmental sciences 2025年第1期147卷 282-293页

作者： Shi-Ping Ou Xiao-Liang Liao Zi-Tao Huang Yan-Cong Hu Zongwei Cai Zhi-Feng Chen Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and HealthSchool of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China State Key Laboratory of Environmental and Biological Analysis Department of ChemistryHong Kong Baptist UniversityHong Kong 999077China

There have been reports of potential health risks for people from hydrophobic organic pollutants,such as polycyclic aromatic hydrocarbons(PAHs),polychlorinated hydrocarbons(PCHs),and organophosphate flame retardants(OPFRs).When a contaminated site is used for residential housing or public utility and recreation areas,the soil-bound organic pollutantsmight pose a threat to human *** this study,we investigated the contamination profiles and potential risks to human health of 15 PAHs,6 PCHs,and 12 OPFRs in soils from four contaminated sites in *** used an in vitro method to determine the oral bioaccessibility of soil *** PAHswere found at concentrations ranging from26.4 ng/g to 987 ng/***(0.27-14.3 ng/g)and OPFRs(6.30-310 ng/g)were detected,but at low levels compared to earlier *** levels of PAHs,PCHs,and OPFRs released from contaminated soils into simulated gastrointestinal fluids ranged from 1.74%to 91.0%,2.51%to 39.6%,and 1.37%to 96.9%,*** on both spiked and unspiked samples,we found that the oral bioaccessibility of pollutantswas correlated with their logKow andmolecularweight,and the total organic carbon content and pH of *** in 13 out of 38 contaminated soil samples posed potential high risks to *** considering oral bioaccessibility,nine soils still posed potential risks,while the risks in the remaining soils became *** contribution of this paper is that it corrects the health risk of soil-bound organic pollutants by detecting bioaccessibility in actual soils from different contaminated sites.

关键词： Contaminated soil Hydrophobic organic pollutant Polycyclic aromatic hydrocarbon Oral bioaccessibility Risk assessment

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Two new multi-phase reliability growth models from the perspective of time between failures and their applications

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Chinese Journal of Aeronautics 2021年第5期34卷 341-349页

作者： Kunsong LIN Yunxia CHEN School of Reliability and Systems Engineering Beihang UniversityBeijing 100191China Science and Technology on Reliability and Environmental Engineering Laboratory Beihang UniversityBeijing 100191China

Aviation products would go through a multi-phase improvement in reliability performance during the research and development *** the literature,most of the existing reliability growth models assume a constant failure intensity in each test phase,which inevitably limits the scope of the *** address this problem,we propose two new models considering timevarying failure intensity in each *** proposed models borrow the idea from the accelerated failure-time *** is assumed that time between failures follow the log-location-scale distribution and the scale parameters in each phase do not change,which forms the basis for integrating the data from all test *** the test-find-test scenario,an improvement factor is introduced to construct the relationship between two successive location *** for the test-fix-test scenario,the instantaneous cumulative time between failures is assumed to be consistent with Duane model and derive the formulation of location *** ratio test is further utilized to test whether the assumption of constant failure intensity in each phase is *** applications with real reliability growth data show that the assumptions are reasonable and the proposed models outperform the existing models.

关键词： reliability growth Test-find-test strategy Test-fix-test strategy Time-varying failure intensity Time between failures

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Modulating electronic structure of nickel diselenide by vanadium doping toward highly efficient and stable bifunctional electrocatalysts for overall water splitting

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Journal of Materials science & technology 2024年第20期187卷 63-71页

作者： Miaomiao Bai Taotao Ai Weiwei Bao Jie Han Junjun Zhang Qi Yu Jiangying Liu Xueling Wei Xiangyu Zou Liangliang Feng National and Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology School of Materials Science and EngineeringShaanxi University of TechnologyHanzhong 723000China State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry&Chemical EngineeringNingxia UniversityYinchuan 750021China School of Materials Science&Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science&TechnologyXi’an 710021China

Designing low-cost and high-efficiency bifunctional electrocatalysts is one of the challenges in the clean production of hydrogen energy in electrochemical water *** metal selenides(TMSes)have been widely studied because of their low price,intrinsic metal properties,and high catalytic *** addition,the synergistic effect between bimetallic selenides exhibits better performance than monometallic selenides in the electrocatalytic ***,we synthesized V-doped NiSe2 nanowire arrays on pretreated nickel foam by a convenient two-step hydrothermal synthesis *** the al-kaline electrolyte,V-NiSe_(2)/NF exhibited excellent OER catalytic activity(293.6 mV@50 mA cm^(-2)).In ad-dition,the introduction of heteroatom V induces stronger electronic interactions between the structural atoms of the catalyst,altering the electronic structure and causing V-NiSe_(2)/NF to demonstrate excellent OER *** the long-term OER test,V-NiSe_(2)/NF was converted into NiOOH and SeO_(x)^(2-),which may be the“real”active species during catalytic reactions,and we also successfully captured the for-mation of intermediate NiOOH and selenite as active centers in the OER process through in-situ *** theoretical calculation shows that the electron transfer modulates the electron structure,changes the adsorption-desorption energy of the reaction intermediates,reduces the potential barrier of the rate-limiting step,and improves the OER *** V doping engineering strategy and the unique nanowire array structure make TMSes exhibit excellent OER *** study provides a new idea for the design of TMSe catalysts with excellent electrocatalytic performance.

关键词： Electrocatalysis Oxygen evolution reaction Vanadium doping Overall water splitting In-situ Raman Density functional theory

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Using multi-scale interaction mechanisms in yolk-shell structured C/Co composite materials for electromagnetic wave absorption

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材料科学技术（英文版） 2025年第12期215卷 36-44页

作者： Jintang Zhou Kexin Zou Jiaqi Tao Jun Liu Yijie Liu Lvtong Duan Zhenyu Cheng Borui Zha Zhengjun Yao Guiyu Peng Xuewei Tao Hexia Huang Yao Ma Peijiang Liu Key Laboratory of Material Preparation and Protection for Harsh Environment Ministry of Industry and Information TechnologyCollege of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing211100China Yuxi Research Institute Yuxi Industries GroupChina North Industries CroupNanyang473000China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing211167China Key Laboratory of Material Preparation and Protection for Harsh Environment Ministry of Industry and Information TechnologyCollege of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing211100China College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing210016China National Key Laboratory on Electromagnetic Environmental Effects and Electro-optical Engineering Army Engineering UniversityNanjing210007China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory the 5th Electronics Research Institute of the Ministry of Industry and Information TechnologyGuangzhou511370China

Advanced chemical engineering for simultaneous modulation of nanomaterial morphology,defects,inter-faces,and structure to enhance electromagnetic and microwave absorption(MA)***,accurately distinguishing the MA contributions of different scale factors and tuning the optimal com-bined effects remains a formidable *** study employs a synergistic approach combining tem-plate protection etching and vacuum annealing to construct a controlled system of micrometer-sized cav-ities and amorphous carbon matrices in metal-organic framework(MOF)*** results demon-strate that the spatial effects introduced by the hollow structure enhance dielectric loss but significantly weaken impedance *** increasing the proportion of amorphous carbon,the balance between electromagnetic loss and impedance matching can be effectively ***,in a suitable graphitization environment,the presence of oxygen vacancies in amorphous carbon can induce signif-icant polarization to compensate for the reduced conductivity loss due to the absence of sp2 *** the synergistic effects of morphology and composition,the samples exhibit a broader absorp-tion bandwidth(6.28 GHz)and stronger reflection loss(-61.64 dB)compared to the original *** conclusion,this study aims to elucidate the multiscale impacts of macroscopic micro-nano structure and microscopic defect engineering,providing valuable insights for future research in this field.

关键词： MOFs Multi-scale regulation Yolk-shell structure Amorphous carbon Oxygen vacancy Microwave absorption

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Synergistic effects in Mn-Co mixed oxide supported on cordierite honeycomb for catalytic deep oxidation of VOCs

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Journal of environmental sciences 2022年第2期34卷 231-243页

作者： Hongyang Zhao Hui Wang Zhenping Qu Key Laboratory of Industrial Ecology and Environmental Engineering School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

A series of Co-Mn mixed oxide catalyst supported on a cordierite monolith was facilely synthesized by ultrasonic *** catalytic performance was evaluated in the combustion of toluene,ethyl acetate and its *** was observed that with incorporating Mn into Co_(3)O_(4),the formation of solid solution with spinel structure could significantly improve the catalytic activity of pure phase Co_(3)O_(4).And the monolithic Co_(0.67)Mn_(0.33)O_(x) catalyst showed the best catalytic performance in the catalytic oxidation of toluene and ethyl acetate which could be completely oxidized at 220 and 180℃ respectively under the reaction velocity(WHSV)about 45,000 m L/(g·hr)and pollutant concentration of 500 ppm *** total conversion temperature of the VOCs mixture was at 230℃(500 ppm V toluene and 500 ppm V ethyl acetate)and determined by the temperature at which the most difficult molecule was *** excellent catalytic performance of monolithic Co_(0.67)Mn_(0.33)O_(x) was attributed to the higher content of Mn^(3+),Co^(3+),surface adsorbed oxygen and better redox *** prepared catalyst showed the good mechanical stability,reaction stability,and good adaptability to different reaction conditions.

关键词： Catalytic oxidation Cobalt Manganese Cordierite Monolithic catalyst

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In situ reconstruction induced oxygen-deficient multiphase Cu based species hybridized with Ni single atoms as tandem platform for CO_(2) electroreduction

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Nano Research 2024年第5期17卷 3888-3894页

作者： Juzhe Liu Yuheng Wang Pengpeng Mo Feng Yang Kaiqi Jiang Zhixiang Cheng Yuxuan Liu Zhiyi Sun Zheng Liu Yimei Zhang Wenxing Chen The Key Laboratory of Resources and Environmental System Optimization Ministry of EducationCollege of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China Energy&Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China SEPA Key Laboratory of Eco-Industry Chinese Research Academy of Environmental SciencesBeijing 100012China

Tandem catalysis,capable of decoupling individual steps,provides a feasible way to build a high-efficiency CO_(2) electro-conversion system for multicarbons(C_(2+)).The construction of electrocatalytic materials is one of focusing ***,we fabricated a single atom involved multivalent oxide-derived Cu composite material and found it inclined to reconstruct into oxygen-deficient multiphase Cu based species hybridized with monatomic Ni on N doped C *** this prototype,rapid CO generation and C-C coupling are successively achieved on NiN4 sites and surface amorphized Cu species with defects,resembling a micro-production *** this way,the in situ formed tandem catalyst exhibited a high Faradaic efficiency(FE)of~78%for C_(2+)products along with satisfactory durability over 50 ***,the reconstruction-induced amorphous layer with abundant asymmetric sites should be favorable to improve the ethanol selectivity(FE:63%),which is about 10 times higher than that of the non-tandem Cu-based contrast *** work offers a new approach for manipulating tandem catalyst systems towards enhancing C_(2+)products.

关键词： tandem catalysis single atom reconstruction amorphous CO_(2)reduction reaction

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Urban stormwater disinfection, quality variability during storage and influence on the freshwater algae: Implications for reuse safety

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Journal of environmental sciences 2023年第2期124卷 655-666页

作者： Shanshan Fan Gang Wen An Liu College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China Shaanxi Key Laboratory of Environmental Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Water Science and Environmental Engineering Research Center College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060China

Stormwater reuse is one of the most important ways to mitigate water resource ***,urban stormwater contains many bacteria species,which threaten the reuse ***,stormwater disinfection is highly *** disinfection has been widely conducted in the drinking water and reclaimed water,it is rarely carried out for *** study collected the roof stormwater and undertook chlorination *** typical bacteria,Escherichia coli(***)and Staphylococcus aureus(***)were selected in this study to investigate the disinfection *** is found that bacteria species present in the stormwater had an important influence on disinfection efficiency while the original stormwater quality did not show an obvious ***,when the disinfected stormwater was stored,the stormwater quality was highly variable during its storage process and the variability was affected by bacteria *** *** containing stormwater showed a high variability of quality and *** significantly ***,the *** containing stormwater quality had a relatively low variability and *** did not significantly ***,it is noted that after storage,the dissolved form of stormwater was more positive to the freshwater algae’s growth while the particulate form(including bacteria and other particulate matters)was *** implies that a further treatment such as filtration is needed before the stored stormwater is recharged into receiving waters in order to remove particulate *** research outcomes can provide useful insight to effective stormwater disinfection and ensure reuse safety.

关键词： Stormwater quality Stormwater disinfection Stormwater storage Stormwater reuse Escherichia coli Staphylococcus aureus

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Double spatial confinement on ruthenium nanoparticles inside carbon frameworks as durable catalysts for a quasi-solid-state Li–O_(2) battery

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Carbon Energy 2023年第8期5卷 114-125页

作者： Meiling Wang Ying Yao Feiyang Yang Zhenwu Tang Jingjie Ren Cunzhong Zhang Feng Wu Xiangke Wang Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science&EngineeringBeijing Institute of TechnologyBeijingChina Beijing Institute of Technology Chongqing Innovation Center ChongqingChina College of Life and Environmental Sciences Minzu University of ChinaBeijingChina College of Environmental Science and Engineering North China Electric Power UniversityBeijingChina

The rational design of large-area exposure,nonagglomeration,and longrange dispersion of metal nanoparticles(NPs)in the catalysts is critical for the development of energy storage and conversion *** attention has been focused on modulating and developing catalyst interface contact engineering between a carbon substrate and dispersed ***,a highly dispersed ultrafine ruthenium(Ru)NP strategy by double spatial confinement is proposed,that is,incorporating directed growth of metal–organic framework crystals into a bacterial cellulose templating substrate to integrate their respective merits as an excellent electrocatalytic cathode catalyst for a quasi-solid-state Li–O_(2) *** porous carbon matrix with highly dispersed ultrafine Ru NPs is well designed and used as cathode catalysts in a Li–O_(2) battery,demonstrating a high discharge areal capacity of 6.82 mAh cm^(–2) at 0.02 mA cm^(–2),a high-rate capability of 4.93 mAh cm^(–2) at 0.2 mA cm^(–2),and stable discharge/charge cycling for up to 500 cycles(2000 h)with low overpotentials of~1.4 *** fundamental understanding of the structure–performance relationship demonstrates a new and promising approach to optimize highly efficient cathode catalysts for solid-state Li–O_(2) batteries.

关键词： bacterial cellulose cathode materials metal-organic frameworks Ru nanoparticles solid-state Li-O_(2)batteries

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Interfacial Ru nanoclusters in tandem with single atoms on oxygen-vacancy regulated CeO_(2)for anion exchange membrane seawater-splitting

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Journal of Energy Chemistry 2025年第3期102卷 618-627页

作者： Yue Wang Jing Li Pengfei Yang Hongdong Li Guangrui Xu Yunmei Du Caixia Li Wei Jin Tianyi Ma Zexing Wu Lei Wang Key Laboratory of Eco-chemical Engineering Ministry of EducationInternational Science and Technology Cooperation Base of Eco-chemical Engineering and Green ManufacturingCollege of Chemistry and Molecular EngineeringCollege of Chemical EngineeringQingdao University of Science&TechnologyQingdao 266042ShandongChina College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina College of Materials Science and Engineering Qingdao University of Science&TechnologyQingdao 266042ShandongChina College of Environment and Safety Engineering Qingdao University of Science and TechnologyQingdao 266042ShandongChina School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009JiangsuChina School of Science STEM CollegeRMIT University 3083VictoriaAustralia

A hydrogen spillover-bridged water dissociation/hydrogen formation could concurrently promote Volmer/Tafel process and improve the efficiency of hydrogen evolution reaction(HER)under alkaline ***,it is still challenging to promote occurrence of hydrogen spillover for the large interfacial transport barriers of H_(2)O and hydrogen on active ***,the strategy of energy barrier gradient to induce hydrogen spillover was proposed by constructing Ru nanoclusters coupled with single atom onto oxygen vacancy cerium dioxide(Ru/CeO_(2)-Ov-2).Density functional theory(DFT)calculations uncover that the adsorption/desorption of H2O occurs at the Ru clusters sites and then the dissociated H*spontaneously overflows from Ru clusters with high binding energy into the adjacent Ru single atom sites with low binding energy,which facilitate the hydrogen ***,the synthesized Ru/CeO_(2)-Ov-2 exhibits a small overpotential of 41 mV at 10 mA cm^(-2)and good stability at 500 mA cm^(-2)for 100 h in alkaline seawater,which could be ascribed to the rapid hydrogen spillover and strong coupling interaction between Ru and CeO_(2)-O_(v).This work provides a novel insight that synthesizing cooperative sites with energy barrier gradient helps to promote hydrogen spillover and accelerate the Volmer/Tafel process of HER.

关键词： Electrocatalyst CeO_(2) Ru Oxygen vacancy Hydrogen evolution reaction

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