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Seasonal prediction of extreme high-temperature days over the Yangtze River basin

science China Earth sciences 2024年第7期67卷 2137-2147页

作者： Shifeng PAN Zhicong YIN Mingkeng DUAN Tingting HAN Yi FAN Yangyang HUANG Huijun WANG Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science and TechnologyNanjing 210044China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China

Extreme high temperatures occur frequently over the densely populated Yangtze River basin(YRB)in China during summer,significantly impacting the local economic development and ecological ***,accurate prediction of extreme high-temperature days in this region remains a ***,the Climate Forecast System Version 2(CFSv2)exhibits poor performance in this ***,based on the interannual increment approach,we develop a hybrid seasonal prediction model over the YRB(HM_(YRB))to improve the prediction of extreme high-temperature days in *** HM_(YRB)relies on the following four predictors:the observed preceding April-May snowmelt in north western Europe;the snow depth in March over the central Siberian Plateau;the CFSv2-forecasted concurrent summer sea surface temperatures around the Maritime Continent;and the 200-hPa geopotential height over the Tibetan *** HM_(YRB)indicates good capabilities in predicting the interannual variability and trend of extreme high-temperature days,with a markable correlation coefficient of 0.58 and a percentage of the same sign(PSS)of 76% during 1983-2015 in the one-year-out ***,the HM_(YRB) maintains high PSS skill(86%)and robustness in the independent prediction period(2016-2022).Furthermore,the HM_(YRB) shows a good performance for years with high occurrence of extreme high-temperature days,with a hit ratio of 40%.These predictors used in HM_(YRB)are beneficial in terms of the prediction skill for the average daily maximum temperature in summer over the YRB,albeit with biases existing in the *** study provides promising insights into the prediction of 2022-like hot extremes over the YRB in China.

关键词： Hot extremes Yangtze River basin CFSv2 Seasonal prediction One-year-out cross-validation

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A survey for light field super-resolution

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High-Confidence Computing 2024年第1期4卷 118-129页

作者： Mingyuan Zhao Hao Sheng Da Yang Sizhe Wang Ruixuan Cong Zhenglong Cui Rongshan Chen Tun Wang Shuai Wang Yang Huang Jiahao Shen State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang UniversityBeijing 100191China Key Laboratory of Data Science and Intelligent Computing International Innovation InstituteBeihang UniversityHangzhou 311115China State Key Laboratory of Software Development Environment School of Computer Science and EngineeringBeihang UniversityBeijing 100191China

Compared to 2D imaging data,the 4D light field(LF)data retains richer scene’s structure information,which can significantly improve the computer’s perception capability,including depth estimation,semantic segmentation,and LF ***,there is a contradiction between spatial and angular resolution during the LF image acquisition *** overcome the above problem,researchers have gradually focused on the light field super-resolution(LFSR).In the traditional solutions,researchers achieved the LFSR based on various optimization frameworks,such as Bayesian and Gaussian *** learning-based methods are more popular than conventional methods because they have better performance and more robust generalization *** this paper,the present approach can mainly divided into conventional methods and deep learning-based *** discuss these two branches in light field spatial super-resolution(LFSSR),light field angular super-resolution(LFASR),and light field spatial and angular super-resolution(LFSASR),***,this paper also introduces the primary public datasets and analyzes the performance of the prevalent approaches on these ***,we discuss the potential innovations of the LFSR to propose the progress of our research field.

关键词： Light field super-resolution Convolutional neural network Transformer Sub-aperture image Epipolar-plane image

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QAAS:quick accurate auto-scaling for streaming processing

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Frontiers of Computer science 2024年第1期18卷 5-15页

作者： Shiyuan LIU Yunchun LI Hailong YANG Ming DUN Chen CHEN Huaitao ZHANG Wei LI State Key Laboratory of Software Development Environment Beijing 100191China School of Computer Science and Engineering Beihang UniversityBeijing 100191China School of Cyber Science and Technology Beihang UniversityBeijing 100191China School of Computer Science and Technology Xi’an Jiaotong UniversityXi’an 710049China

In recent years,the demand for real-time data processing has been increasing,and various stream processing systems have *** the amount of data input to the stream processing system fluctuates,the computing resources required by the stream processing job will also *** resources used by stream processing jobs need to be adjusted according to load changes,avoiding the waste of computing *** present,existing works adjust stream processing jobs based on the assumption that there is a linear relationship between the operator parallelism and operator resource consumption(e.g.,throughput),which makes a significant deviation when the operator parallelism *** paper proposes a nonlinear model to represent operator *** divide the operator performance into three stages,the Non-competition stage,the Non-full competition stage,and the Full competition *** our proposed performance model,given the parallelism of the operator,we can accurately predict the CPU utilization and operator *** with actual experiments,the prediction error of our model is below 5%.We also propose a quick accurate auto-scaling(QAAS)method that uses the operator performance model to implement the auto-scaling of the operator parallelism of the Flink *** to previous work,QAAS is able to maintain stable job performance under load changes,minimizing the number of job adjustments and reducing data backlogs by 50%.

关键词： stream processing performance model auto-scaling

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Honeycomb-like biochar framework coupled with Fe_(3)O_(4)/FeS nanoparticles as efficient heterogeneous Fenton catalyst for phenol degradation

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Journal of environmental sciences 2024年第2期136卷 390-399页

作者： Aihua Cheng Yi He Xiaohe Liu Chi He Department of Environmental Engineering College of Geology and EnvironmentXi’an University of Science and TechnologyXi’an 710054China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China National Engineering Laboratory for VOCs Pollution Control Material and Technology University of Chinese Academy of SciencesBeijing 101408China

Achieving an efficient and stable heterogeneous Fenton reaction over a wide pH range is of great significance for wastewater ***,a pollen-derived biochar catalyst with a unique honeycomb-like structure,coupled with the dispersion of magnetic Fe_(3)O_(4)/FeS(Fe/S)nanoparticles,was synthesized by simple impregnation precursor,followed by *** prepared Fe/S-biochar catalyst demonstrated outstanding phenol degradation efficiency across a wide pH range,with 98%of which eliminated even under neutral conditions(pH 7.0).The high catalytic activity was due to the multilevel porous structure of pollenderived biochar provided enough active sites and allowed for better electron transfer,then increases oxidation ability to promote the ***,the acid microenvironment formed by SO_(4)^(2-)group from Fe/S composite extended the pH range for Fenton reaction,and S^(2-)facilitated the conversion of≡Fe^(3+)to≡Fe^(2+),resulting in remarkable degradation ***,biochar can effectively promote cycling stability by limiting Fe *** work may provide a general strategy for designing 3D framework biochar-based Fe/S catalysts with excellent performance for heterogeneous Fenton reactions.

关键词： Biomass Biochar Fenton reaction Fe_(3)O_(4)/FeS(Fe/S) Phenol degradation

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Porous needle-like Fe-Ni-P doped with Ru as efficient electrocatalyst for hydrogen generation powered by sustainable energies

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Nano Research 2023年第2期16卷 2428-2435页

作者： Yue Wang Zhi Chen Qichang Li Xinping Wang Weiping Xiao Yunlei Fu Guangrui Xu Bin Li Zhenjiang Li Zexing Wu Lei Wang Key Laboratory of Eco-chemical Engineering International Science and Technology Cooperation Base of Eco-chemical Engineering and Green ManufacturingCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Science Nanjing Forestry UniversityNanjing 210037China Shandong Engineering Research Center for Marine Environment Corrosion and Safety Protection College of Environment and Safety EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266061China

Electrocatalytic water electrolysis,involving hydrogen evolution reaction(HER)and oxygen evolution reaction(OER),two halfreactions,is an eco-friendly approach toward hydrogen *** this work,needle-like Ru-Fe-Ni-P on NiFe foam is prepared through corrosive engineering and following a low-temperature phosphorization procedure for overall *** as-designed Ru-Fe-Ni-P exhibits a porous needle-like structure,surface,and binder-free merits,and then can expose rich active sites,favor the transportation of mass/electron,and accelerate the reaction kinetics during catalytic ***,the synthesized Ru-Fe-Ni-P owns remarkable catalytic performance for HER,with 18 and 67 mV to reach 10 mA·cm^(−2)in alkaline and neutral ***,a low cell voltage of 1.51 V is required to produce a current of 10 mA·cm^(−2)in a two electrode electrolyzer with excellent ***,sustainable energies can power the electrolyzer effectively with abundant hydrogen generation.

关键词： metal phosphide needle-like morphology hydrogen generation overall water splitting

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Amine-functionalized hierarchically porous carbon supported Pd nanocatalysts for highly efficient H2 generation from formic acid with fast-diffusion channels

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Journal of Energy Chemistry 2023年第1期76卷 249-258,I0007页

作者： Xianzhao Shao Xinyi Miao Fengwu Tian Miaomiao Bai Xiaosha Guo Wei Wang Zuoping Zhao Xiaohui Ji Miyi Li Fangan Deng Shaanxi Key Laboratory of Catalysis School of Chemistry and Environment ScienceShanxi University of TechnologyHanzhong 723001ShaanxiChina School of Mathematics and Computer Science Shanxi University of TechnologyHanzhong 723001ShaanxiChina State Key Laboratory of Qinba Bio-Resource and Ecological Environment Shaanxi University of TechnologyHanzhong 723001ShaanxiChina School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 102488China

Formic acid(FA)has come to be considered a potential candidate for hydrogen storage,and the development of efficient catalysts for H2releasing is crucial for realizing the sustainable process from ***,we have developed the ultrafine Pd nanoparticle(NPs)with amine-functionalized carbon as a support,which was found to show an excellent catalytic activity in H_(2)generation from FA *** synergetic mechanism between amine-group and Pd active site was demonstrated to facilitate H2generation byβ-hydride ***,the texture of support for Pd NPs also plays an important role in determining the reactivity of FA,since the diffusion of gaseous products makes the kinetics of diffusion as a challenge in this high performance Pd *** a result,the as-prepared Pd/NH_(2)-TPC catalyst with the small sized Pd nanoparticles and the hierarchically porous structures shows a turnover of frequency(TOF)value of 4312 h^(-1)for the additive-free FA dehydrogenation at room temperature,which is comparable to the most promising heterogeneous *** results demonstrated that the intrinsic catalytic activities of active site as well as the porous structure of support are both important factors in determining catalytic performances in H2generation from FA dehydrogenation,which is also helpful to develop high-activity catalysts for other advanced gas-liquid-solid reactions systems.

关键词： Hierarchically carbon Diffusion Formic acid Hydrogen production Palladium nanoparticles

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Construction of core@double-shell structured energetic composites with simultaneously enhanced thermal stability and safety performance

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Defence technology（防务技术） 2024年第4期34卷 134-142页

作者： Peng Wang Wen Qian Ruolei Zhong Fangfang He Xin Li Jie Chen Li Meng Yinshuang Sun Guansong He Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China State Key Laboratory of Environment-friendly Energy Materials School of Materials and ChemistrySouthwest University of Science and TechnologyMianyang 621010China

The poor thermal stability and high sensitivity severely hinder the practical application of hexanitrohexaazaisowurtzitane(CL-20).Herein,a kind of novel core@double-shell CL-20 based energetic composites were fabricated to address the above *** coordination complexes which consist of natural polyphenol tannic acid(TA) and Fe~Ⅲ were chosen to construct the inner shell,while the graphene sheets were used to build the outer *** resulting CL-20/TA-Fe~Ⅲ/graphene composites exhibited simultaneously improved thermal stability and safety performance with only 1 wt% double-shell content,which should be ascribed to the intense physical encapsulation effect from inner shell combined with the desensitization effect of carbon nano-materials from outer *** phase transition(ε to γ) temperature increased from 173.70 ℃ of pure CL-20 to 191.87℃ of CL-20/TA-Fe~Ⅲ/graphene ***,the characteristic drop height(H_(50)) dramatically increased from 14.7 cm of pure CL-20 to112.8 cm of CL-20/TA-Fe~Ⅲ/graphene composites,indicating much superior safety performance after the construction of the double-shell *** general,this work has provided an effective and versatile strategy to conquer the thermal stability and safety issues of CL-20 and contributes to the future application of high energy density energetic materials.

关键词： CL-20 Double-shell structure Thermal stability Safety performance Tannic acid Graphene sheets

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Evaluating coarse PM composition and sources based on bulk and molecular speciation of PM2.5 and PM10 in Nanjing, East China

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Journal of environmental sciences 2025年第6期152卷 155-166页

作者： Wangnan Cui Zishu Wang Wei Feng Chao Qin Hong Liao Yuhang Wang Mingjie Xie Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlSchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044China Nuist Reading Academy Nanjing University of Information Science&TechnologyNanjing 210044China State Environmental Protection Key Laboratory of Monitoring and Analysis for Organic Pollutants in Surface Water Jiangsu Environmental Monitoring CenterNanjing 210036China School of Earth and Atmospheric Sciences Georgia Institute of TechnologyAtlanta GA 30332United States

To understand the differences in the composition and sources of PM_(2.5) and PM_(10) caused by coarse particles,integrated PM_(2.5) and PM_(10) samples were synchronously collected in Nanjing,East China,in summer 2020 and winter 2020/*** and molecular speciation and light absorption measurements of aerosol extractswere performed,followed by positivematrix factorization(PMF)based on the PM_(2.5) and PM_(10) data sets,*** difference in average concentrations of total bulk species between PM_(2.5) and PM_(10) was mainly caused by the distribution of considerable NO_(3)^(–),SO42–,Ca^(2+),and organic carbon(OC)in coarse *** PMinfluenced by abrasion products from tirewear and leaves contributed about half of the low-volatility n-alkanes in *** contribution of coarse PM to biomass burning tracers and water-soluble OC increased in winter when biomass combustion was excessively *** than 70%of sugar polyols were attributable to coarse PM in summer,and biomass burning could be an important source in *** light-absorbing organic chromophores were almost entirely associated with PM_(2.5),but water-soluble organic carbon(WSOC)exhibited stronger light absorption in PM_(10) extracts than in PM_(2.5) extracts possibly due to the influence of coarse PMon *** analysis indicated that biomass burning,aqueous-phase reactions,and processed dust were the main contributors of organic matter and its light absorption in *** primary and secondary sources made discernable contributions only in *** differences between PM_(2.5) and PM_(10) were likely attributed to mixing of crustal dust,combustion particles,and surface reactions.

关键词： Coarse particle Bulk species Organic molecular marker Light absorption Source apportionment

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Constructing mixed-dimensional lightweight magnetic cobalt-based composites heterostructures:An effective strategy to achieve boosted microwave absorption and self-anticorrosion

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Journal of Materials science & technology 2024年第29期196卷 60-70页

作者： Jiajun Li Di Lan Yuhang Cheng Zirui Jia Panbo Liu Xuetao Shi Hua Guo Ailing Feng Xing Feng Guanglei Wu Pengfei Yin College of Science Sichuan Agricultural UniversityYa’an 625014China School of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Institute of Physics&Optoelectronics Technology Baoji University of Arts and SciencesBaoji 721016China

Subtle microstructure design and an appropriate multicomponent strategy are essential for advanced electromagnetic absorbing(EMA)materials with a wide effective absorption bandwidth(EAB)and intense ***,sophisticated environments restrict the range of applications for EMA ***,three hollow spherical bifunctional CoSx/MnS/C nanocomposites with different crystal structures were constructed via cation exchange and subsequent *** manganese sulfide and carbon generated during vulcanization exhibit a narrow band gap and enhanced conductivity,thereby facilitating conductive *** presence of cobalt sulfide facilitates the improvement of magnetic *** importantly,there is a potential difference between different phases at the heterogeneous interface,resulting in a region of space charge,which is conducive to interfacial *** 3D hollow structure and heterogeneous dielectric/magnetic interfaces benefit the predominant EMA performance by forming perfect impedance matching,interface polarization,conduction loss,and magnetic loss ***,an optimal reflection loss(RL)of-51.31 dB at 10.72 GHz and an effective EAB of 5.92 GHz at 2.1 mm can be achieved for Co_(1-x) S/MnS/C ***,the nanocomposites maintained promising self-anticorrosion properties in simulated seawater *** metal sulfides with superior self-anticorrosion properties provide a pathway to efficient wave-absorbing materials in complicated environments.

关键词： Heterogeneous interfaces Dielectric/magnetic loss Different crystal structure Microwave absorption Self-anticorrosion

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Cross-stacking crystal structural configuration of integrated cathode materials for proton-conducting solid oxide fuel cells

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Rare Metals 2024年第11期43卷 6088-6095页

作者： Jun-Yi Gong Dan-Dan Yang Wei Liu Jie Hou School of Resource Environment and Safety Engineering University of South ChinaHengyang 421001China CAS Key Laboratory of Materials for Energy Conversion and Collaborative Innovation Center of Suzhou Nano Science and Technology University of Science and Technology of ChinaHefei 230026China

The absence of cathode materials with excellent activity and stability has hampered the widespread application of proton-conducting solid oxide fuel cells(H-SOFCs).Sm_(2)Ba_(1.33)Ce_(0.67)Cu_(3)O_(9)(SBCC)is a layered material formed by the cross-stacking of a[CuO_(5)layer][CeO_(2)-like layer][CuO_(5)layer][Sm_(x)Ba_(1-x)CuO_(y)perovskite layer].This complex structure could potentially enhance electrocatalytic performance owing to the integration of differentstructural,chemical and electronic properties.

关键词： structural stacking solid

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