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Peak Factor Method for Predicting Maximum Response and Control Force in Across-Wind Direction for Active Base-Isolation 认领 引用
1
作者 Yinli Chen Ryuki Kamano +1 位作者 Daiki Sato Kou Miyamoto 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第5期1236-1238,共3页
Dear Editor,This letter proposes a simple method for estimating the maximum responses and control forces of base-isolated structures with active structural control(active base-isolation)without numerical simulations.A... Dear Editor,This letter proposes a simple method for estimating the maximum responses and control forces of base-isolated structures with active structural control(active base-isolation)without numerical simulations.An equivalent passive system of an active base-isolation is constructed to obtain the first mode’s input and modal transfer function. 展开更多
关键词 numerical simulationsan Maximum response estimating maximum responses control forces Peak factor Control force active structural control active Active base isolation equivalent passive system
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Spatiotemporal variability of maximum precipitation altitude and precipitation gradients in global mountain basins 认领 引用
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作者 FU Yiping SUN Weijun +6 位作者 CHEN Rensheng HAN Chuntan HUAI Baojuan WANG Yuzhe AN Hongmin WANG Yingshuang WANG Lei 《Journal of Mountain Science》 SCIE CSCD 2026年第6期2630-2649,共20页
Accurate precipitation data is a crucial input for hydrological models,yet precipitation datasets in alpine regions are too coarse to be used for regional hydrological research.The Maximum Precipitation Altitude(MPA)a... Accurate precipitation data is a crucial input for hydrological models,yet precipitation datasets in alpine regions are too coarse to be used for regional hydrological research.The Maximum Precipitation Altitude(MPA)and precipitation gradient are key indicators for revealing the complex interactions between topography and precipitation,and they play an essential role in understanding precipitation distribution in mountainous regions.Based on the Integrated Multi–satellitE Retrievals for Global Precipitation Measurement(IMERG)dataset,this study calculated the MPA and precipitation gradients for 858 major global mountain basins.In addition,we discussed spatiotemporal characteristics of MPAs and precipitation gradients across four representative mountain ranges-the Alps,Andes,Rocky Mountains,and Tibetan Plateau.The results showed that the MPAs among different mountain ranges exhibit substantial spatiotemporal variability.Temporally,MPAs are strongly influenced by seasonal and monsoonal variations in both the Northern and Southern Hemispheres.Spatially,the mean MPAs are 1094.8 m in the Alps,2644.9 m in the Andes,2122.6 m in the Rocky Mountains,and 3913.6 m on the Tibetan Plateau,indicating that higher MPAs tend to be associated with lower water vapor.Regarding precipitation gradients,the average annual gradient is positive below the MPA(43.32 mm/100 m)but becomes negative above the MPA(−11.48 mm/100 m).Furthermore,MPAs show positive correlations with wind speed and the lifting condensation level(LCL),but negative correlations with precipitation frequency,precipitation intensity,specific humidity,and the angle between wind direction and slope aspect.These findings provide new insights into the spatial heterogeneity of precipitation in mountainous environments and offer valuable guidance for improving hydrological and climate modeling in complex terrain. 展开更多
关键词 Maximum precipitation altitude Precipitation gradients Topography Alpine regions Influence factors IMERG
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A novel local maximum synchrosqueezing W transform for reservoir characterization 认领 引用
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作者 Chao-He Wang Zhao-Yun Zong +2 位作者 Xing-Yao Yin Kun Li Ying-Hao Zuo 《Petroleum Science》 SCIE EI CAS CSCD 2026年第4期1842-1859,共18页
Time-frequency analysis(TFA)serves as a critical tool in seismic signal processing and interpretation,particularly for characterizing non-stationary signals.However,conventional TFA methods,such as the short-time Four... Time-frequency analysis(TFA)serves as a critical tool in seismic signal processing and interpretation,particularly for characterizing non-stationary signals.However,conventional TFA methods,such as the short-time Fourier transform(STFT)and continuous wavelet transform(CWT),suffer from inherent limitations,including energy smearing and insufficient time-frequency resolution,which hinder their ability to meet the demands of high-precision seismic interpretation.By detecting local maxima along the frequency direction,LMSST significantly improves energy concentration in time-frequency representations(TFRs).Meanwhile,the W transform is known for high resolution in low-frequency regions and a flexible windowing function,which surpasses conventional TFA methods.However,both methods face limitations when applied independently to complex seismic signals,particularly in scenarios demanding high precision and resolution.To overcome these challenges,the local maximum synchrosqueezing W transform(LMSSWT)is proposed.This approach combines the adaptive windowing of the W transform with the precise frequency reallocation of the LMSST,resulting in a more centralized and energy-concentrated time-frequency representation.Furthermore,an inverse LMSSWT is also derived to ensure completeness and accurate signal reconstruction.By synergizing the W transform's adaptive windowing with the energy concentration of LMSST,LMSSWT overcomes key limitations in time-frequency analysis of complex seismic signals,offering a powerful tool for high-resolution reservoir prediction and hydrocarbon detection.The effectiveness and applicability of the proposed method are validated through synthetic tests and practical data applications. 展开更多
关键词 Reservoir characterization W transform(WT) Time-frequency analysis(TFA) Local maximum synchrosqueezing transform(LMSST)
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Research hotspots and trend analyses of maximum biosafety level pathogens:A bibliometric study using China’s 2023 catalogue of pathogens as an example 认领 引用
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作者 Jing Huang Yuanyuan Guo +4 位作者 Yeerzhati Tuluhongtayi Changliang Wang Juan Song Jun Liu Guizhen Wu 《Biosafety and Health》 CSCD 2026年第3期208-219,共12页
Maximum biosafety level laboratories,also known as Biosafety Level 4(BSL-4)laboratories are pivotal to advancing basic research and technological innovation for preventing and treating infections caused by maximum bio... Maximum biosafety level laboratories,also known as Biosafety Level 4(BSL-4)laboratories are pivotal to advancing basic research and technological innovation for preventing and treating infections caused by maximum biosafety level pathogens.Herein,we conduct a bibliometric analysis to identify global research trends and hotspots in this field,with the aim of guiding future scientific strategy and fostering international collaboration.A total of 604 relevant English publications(1980–2025)from the Web of Science Core Collection were analyzed using CiteSpace,VOSviewer,and the bibliometrix R package.The results delineate a two-phase growth pattern:annual publication output transitioned from a prolonged period of slow growth to a sustained high-output plateau following the 2014–2016 Ebola epidemic.Ebola virus is the most frequently studied pathogen,while the Journal of Infectious Diseases is the most prolific journal.Keyword analysis revealed an evolution in research focus from basic research towards applied medical countermeasures,with current priorities centered on evaluating the safety and efficacy of vaccines.The United States emerged as the dominant force,producing the leading institutions,core researchers,and maintained a robust collaborative network with partners like Canada and Germany that significantly outpaced Asian countries.This concentration of research effort,observed within our pathogen cohort,underscores the need for more balanced global cooperation focused on a wider spectrum of maximum biosafety level pathogens. 展开更多
关键词 Maximum biosafety level pathogens Biosafety Level 4(BSL-4)laboratory Bibliometrics Research hotspots Trend analyses
The Injective Chromatic Index of Planar Graphs with Maximum Degree 4 认领 引用
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作者 Yuliang ZHAO Lianying MIAO Shanshan ZHANG 《Journal of Mathematical Research with Applications》 CSCD 2026年第2期153-163,共11页
An injective k-edge coloring of a graph G is k-edge coloringκof G such thatκ(e1)≠κ(e3)for any three consecutive edges e1,e2 and e3 of a path or a triangle.The injective chromatic index of G,denoted by x'i(G),i... An injective k-edge coloring of a graph G is k-edge coloringκof G such thatκ(e1)≠κ(e3)for any three consecutive edges e1,e2 and e3 of a path or a triangle.The injective chromatic index of G,denoted by x'i(G),is the smallest integer k such that G has an injective k-edge coloring.In this paper,we prove that x'i(G)≤9 if G is a planar graph with maximum degreeΔ≤4,girth g≥6 and without intersecting 6-cycles. 展开更多
关键词 njective edge coloring planar graph maximum degree girth
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Asymptotics of the Maximum Sum of Randomly Stopped Finite Random Walks with Subexponential Distribution 认领 引用
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作者 CAO Shuxia LIU Zixin ZHANG Shuguang 《应用概率统计》 CSCD 北大核心 2026年第1期75-89,共15页
We study a finite number of independent random walks with subexponentially distributed increments and negative drifts.We extend the one-dimensional results to finite and fully general stopping times.Assuming that the ... We study a finite number of independent random walks with subexponentially distributed increments and negative drifts.We extend the one-dimensional results to finite and fully general stopping times.Assuming that the distribution of the lengths of these intervals is relatively light compared to the distribution of the increments of the random walks,we derive the asymptotic tail distribution of the partial maximum sum over the random time interval. 展开更多
关键词 subexponential distribution maximum sum random walk asymptotics
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Multi-Kernel Bandwidth Based Maximum Correntropy Extended Kalman Filter for GPS Navigation 认领 引用 被引量：1
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作者 Amita Biswal Dah-Jing Jwo 《Computer Modeling in Engineering & Sciences》 SCIE EI 2025年第7期927-944,共18页
The extended Kalman filter(EKF)is extensively applied in integrated navigation systems that combine the global navigation satellite system(GNSS)and strap-down inertial navigation system(SINS).However,the performance o... The extended Kalman filter(EKF)is extensively applied in integrated navigation systems that combine the global navigation satellite system(GNSS)and strap-down inertial navigation system(SINS).However,the performance of the EKF can be severely impacted by non-Gaussian noise and measurement noise uncertainties,making it difficult to achieve optimal GNSS/INS integration.Dealing with non-Gaussian noise remains a significant challenge in filter development today.Therefore,the maximum correntropy criterion(MCC)is utilized in EKFs to manage heavytailed measurement noise.However,its capability to handle non-Gaussian process noise and unknown disturbances remains largely unexplored.In this paper,we extend correntropy from using a single kernel to a multi-kernel approach.This leads to the development of a multi-kernel maximum correntropy extended Kalman filter(MKMC-EKF),which is designed to effectively manage multivariate non-Gaussian noise and disturbances.Further,theoretical analysis,including advanced stability proofs,can enhance understanding,while hybrid approaches integrating MKMC-EKF with particle filters may improve performance in nonlinear systems.The MKMC-EKF enhances estimation accuracy using a multi-kernel bandwidth approach.As bandwidth increases,the filter’s sensitivity to non-Gaussian features decreases,and its behavior progressively approximates that of the iterated EKF.The proposed approach for enhancing positioning in navigation is validated through performance evaluations,which demonstrate its practical applications in real-world systems like GPS navigation and measuring radar targets. 展开更多
关键词 Extended Kalman filter maximum correntropy criterion(MCC) multi-kernel maximum correntropy(MKMC) non-Gaussian noise
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Influences of maximum principal stress direction and cross-section shape on tunnel stability 认领 引用 被引量：6
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作者 Xuefeng Si Zilong Zhang +4 位作者 Xibing Li Guansheng Yi Yong Luo Lihai Tan Kaifeng Han 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第4期2159-2180,共22页
To investigate the effects of the maximum principal stress direction(θ)and cross-section shape on the failure characteristics of sandstone,true-triaxial compression experiments were conducted using cubic samples with... To investigate the effects of the maximum principal stress direction(θ)and cross-section shape on the failure characteristics of sandstone,true-triaxial compression experiments were conducted using cubic samples with rectangular,circular,and D-shaped holes.Asθincreases from 0°to 60°in the rectangular hole,the left failure location shifts from the left corner to the left sidewall,the left corner,and then the floor,while the right failure location shifts from the right corner to the right sidewall,right roof corner,and then the roof.Furthermore,the initial failure vertical stress first decreases and then increases.In comparison,the failure severity in the rectangular hole decreases for variousθvalues as 30°>45°>60°>0°.With increasingθ,the fractal dimension(D)of rock slices first increases and then decreases.For the rectangular and D-shaped holes,whenθ=0°,30°,and 90°,D for the rectangular hole is less than that of the D-shaped hole.Whenθ=45°and 60°,D for the rectangular hole is greater than that of the D-shaped hole.Theoretical analysis indicates that the stress concentration at the rectangular and D-shaped corners is greater than the other areas.The failure location rotates with the rotation ofθ,and the failure occurs on the side with a high concentration of compressive stress,while the side with the tensile and compressive stresses remains relatively stable.Therefore,the fundamental reason for the rotation of failure location is the rotation of stress concentration,and the external influencing factor is the rotation ofθ. 展开更多
关键词 Maximum principal stress direction Cross-section shape True-triaxial experiment Failure characteristics Fractal dimension Theoretical analysis
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Correlation between the rock mass properties and maximum horizontal stress:A case study of overcoring stress measurements 认领 引用 被引量：2
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作者 Peng Li Meifeng Cai +2 位作者 Shengjun Miao Yuan Li Yu Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2025年第1期39-48,共10页
Understanding the mechanical properties of the lithologies is crucial to accurately determine the horizontal stress magnitude.To investigate the correlation between the rock mass properties and maximum horizontal stre... Understanding the mechanical properties of the lithologies is crucial to accurately determine the horizontal stress magnitude.To investigate the correlation between the rock mass properties and maximum horizontal stress,the three-dimensional(3D)stress tensors at 89 measuring points determined using an improved overcoring technique in nine mines in China were adopted,a newly defined characteristic parameter CERPwas proposed as an indicator for evaluating the structural properties of rock masses,and a fuzzy relation matrix was established using the information distribution method.The results indicate that both the vertical stress and horizontal stress exhibit a good linear growth relationship with depth.There is no remarkable correlation between the elastic modulus,Poisson's ratio and depth,and the distribution of data points is scattered and messy.Moreover,there is no obvious relationship between the rock quality designation(RQD)and depth.The maximum horizontal stress σH is a function of rock properties,showing a certain linear relationship with the CERPat the same depth.In addition,the overall change trend of σH determined by the established fuzzy identification method is to increase with the increase of CERP.The fuzzy identification method also demonstrates a relatively detailed local relationship betweenσ_H and CERP,and the predicted curve rises in a fluctuating way,which is in accord well with the measured stress data. 展开更多
关键词 overcoring stress measurements elastic modulus Poisson's ratio rock quality designation maximum horizontal stress fuzzy identification
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A Robust GNSS Navigation Filter Based on Maximum Correntropy Criterion with Variational Bayesian for Adaptivity 认领 引用 被引量：2
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作者 Dah-Jing Jwo Yi Chang Ta-Shun Cho 《Computer Modeling in Engineering & Sciences》 SCIE EI 2025年第3期2771-2789,共19页
In this paper,an advanced satellite navigation filter design,referred to as the Variational Bayesian Maximum Correntropy Extended Kalman Filter(VBMCEKF),is introduced to enhance robustness and adaptability in scenario... In this paper,an advanced satellite navigation filter design,referred to as the Variational Bayesian Maximum Correntropy Extended Kalman Filter(VBMCEKF),is introduced to enhance robustness and adaptability in scenarios with non-Gaussian noise and heavy-tailed outliers.The proposed design modifies the extended Kalman filter(EKF)for the global navigation satellite system(GNSS),integrating the maximum correntropy criterion(MCC)and the variational Bayesian(VB)method.This adaptive algorithm effectively reduces non-line-of-sight(NLOS)reception contamination and improves estimation accuracy,particularly in time-varying GNSS measurements.Experimental results show that the proposed method significantly outperforms conventional approaches in estimation accuracy under heavy-tailed outliers and non-Gaussian noise.By combining MCC with VB approximation for real-time noise covariance estimation using fixed-point iteration,the VBMCEKF achieves superior filtering performance in challenging GNSS conditions.The method’s adaptability and precision make it ideal for improving satellite navigation performance in stochastic environments. 展开更多
关键词 Maximum correntropy criterion variational Bayesian extended Kalman filter GNSS
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Standing crop and size structure of phytoplankton are strongly regulated by the turbidity maximum in the macrotidal Qiantang River estuary-Hangzhou Bay 认领 引用 被引量：1
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作者 Lin ZHAN Yuanli ZHU +9 位作者 Chaoxiang XU Wei DU Zhi YANG Yulu JIANG Kangning JIA Ping DU Chenhua HAN Wei HUANG Jiangning ZENG Zhibing JIANG 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2025年第4期1227-1242,共16页
The turbidity maximum zone(TMZ)is a distinctive aquatic environment marked by consistently higher turbidity compared to upstream and downstream section.In the TMZ,physicochemical properties such as intense light limit... The turbidity maximum zone(TMZ)is a distinctive aquatic environment marked by consistently higher turbidity compared to upstream and downstream section.In the TMZ,physicochemical properties such as intense light limitation,abundant nutrients,and rapid salinity shifts play a crucial role in shaping phytoplankton dynamics.The Qiantang River estuary-Hangzhou Bay(QRE-HZB)is a macrotidal estuary system known for its exceptionally high suspended solids concentration.To investigate the impact of TMZ on the standing crop and size structure of phytoplankton in the QRE-HZB,we conducted three cruises in dry,wet,and dry-to-wet transition seasons during 2022-2023,by assessing parameters including size fractionated chlorophyll a(chl a),turbidity,Secchi depth,temperature,salinity,nutrients,and mesozooplankton.Results reveal significant variations in the TMZ and associated environmental factors in different periods,which markedly influenced the phytoplankton chl-a concentration,size structure,and cell activity(pheophytin/chl a).The chl-a concentration was high with micro-phytoplankton predominance in wet season,while nano-phytoplankton dominated in dry season.Within the TMZ,lower chl-a concentrations and pico-chl-a contributions,alongside higher pheophytin/chl-a and micro-chl-a contributions,were observed.The Spearman’s rank correlation and generalized additive model analyses indicated strong correlations of chl-a concentrations with turbidity,nutrients,and mesozooplankton.Redundancy analysis further revealed that salinity,nutrients,and turbidity significantly regulated variations in size structure.Phytoplankton mortality within the TMZ was primarily driven by high turbidity and salinity fluctuations,reflecting the vigorous resuspension and mixing of freshwater and seawater in the QRE-HZB.These findings highlight that the standing crop and size structure of phytoplankton were strongly regulated by the TMZ and associated physicochemical factors in the macrotidal QRE-HZB. 展开更多
关键词 Qiantang River estuary Hangzhou Bay turbidity maximum zone phytoplankton standing crop size structure
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Hydrographic control on subsurface chlorophyll maximum in the northern South China Sea in autumn 认领 引用 被引量：1
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作者 Xiang GONG Hui LIU +2 位作者 Xun GONG Jiyao LIU Huiwang GAO 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2025年第4期1213-1226,共14页
As a frequently-observed phenomenon in the northern South China Sea(nSCS),subsurface chlorophyll maximum(SCM)evolution from summer to winter remains unclear,neither the associated hydrographic control.In this study,on... As a frequently-observed phenomenon in the northern South China Sea(nSCS),subsurface chlorophyll maximum(SCM)evolution from summer to winter remains unclear,neither the associated hydrographic control.In this study,on the basis of in-situ data of fall-season cruises in 2004–2006,we characterized the depth,thickness and intensity of the SCM in the nSCS using a general Gaussian-function fitting approach,and investigated a linkage to the corresponding ocean vertical buoyance properties.Our results show that the SCM becomes deeper,thicker and less intense offshore-wards in the nSCS during fall seasons.In parallel,a correlation between the SCM variation and mixed layer depth exists in the nSCS,and it becomes pronounced in the shelf region compared to the slope and basin areas in autumn.Physically,once warmer surface ocean and thus stronger thermo-determined stratification,the SCM layer goes deeper and becomes thicker and less intense in the nSCS,especially in the shelf area of the nSCS.Moreover,the impact of water temperatures at deeper layers on the vertical stratification exerts more consequent roles on the spatial variability of SCM,compared to surface temperatures in the nSCS.Specifically,the isotherm line of 22℃ acts as crucial indicator for variations of the SCM in the nSCS during autumns. 展开更多
关键词 subsurface chlorophyll maximum(SCM) northern South China Sea(nSCS) autumn season hydrographic control
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SSA-LSTM-Multi-Head Attention Modelling Approach for Prediction of Coal Dust Maximum Explosion Pressure Based on the Synergistic Effect of Particle Size and Concentration 认领 引用 被引量：1
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作者 Yongli Liu Weihao Li +1 位作者 Haitao Wang Taoren Du 《Computer Modeling in Engineering & Sciences》 SCIE EI 2025年第5期2261-2286,共26页
Coal dust explosions are severe safety accidents in coal mine production,posing significant threats to life and property.Predicting the maximum explosion pressure(Pm)of coal dust using deep learning models can effecti... Coal dust explosions are severe safety accidents in coal mine production,posing significant threats to life and property.Predicting the maximum explosion pressure(Pm)of coal dust using deep learning models can effectively assess potential risks and provide a scientific basis for preventing coal dust explosions.In this study,a 20-L explosion sphere apparatus was used to test the maximum explosion pressure of coal dust under seven different particle sizes and ten mass concentrations(Cdust),resulting in a dataset of 70 experimental groups.Through Spearman correlation analysis and random forest feature selection methods,particle size(D10,D20,D50)and mass concentration(Cdust)were identified as critical feature parameters from the ten initial parameters of the coal dust samples.Based on this,a hybrid Long Short-Term Memory(LSTM)network model incorporating a Multi-Head Attention Mechanism and the Sparrow Search Algorithm(SSA)was proposed to predict the maximum explosion pressure of coal dust.The results demonstrate that the SSA-LSTM-Multi-Head Attention model excels in predicting the maximum explosion pressure of coal dust.The four evaluation metrics indicate that the model achieved a coefficient of determination(R2),root mean square error(RMSE),mean absolute percentage error(MAPE),and mean absolute error(MAE)of 0.9841,0.0030,0.0074,and 0.0049,respectively,in the training set.In the testing set,these values were 0.9743,0.0087,0.0108,and 0.0069,respectively.Compared to artificial neural networks(ANN),random forest(RF),support vector machines(SVM),particle swarm optimized-SVM(PSO-SVM)neural networks,and the traditional single-model LSTM,the SSA-LSTM-Multi-Head Attention model demonstrated superior generalization capability and prediction accuracy.The findings of this study not only advance the application of deep learning in coal dust explosion prediction but also provide robust technical support for the prevention and risk assessment of coal dust explosions. 展开更多
关键词 Coal dust explosion deep learning maximum explosion pressure predictive model SSA-LSTM multi-head attention mechanism
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Phase-and Amplitude-Locking of Annual Maximum Rainfall Events in North China with the Annual Cycle of the East Asian Summer Monsoon 认领 引用
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作者 Wanyi SUN Congwen ZHU +2 位作者 Boqi LIU Yuhan YAN Zhiqi YAN 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2025年第8期1608-1619,共12页
The annual maximum rainfall event(AMRE)refers to the maximum consecutive five-day rainfall in a year.In North China,these events account for 15%–80%of the total summer(June–August)rainfall amount and pose a great ch... The annual maximum rainfall event(AMRE)refers to the maximum consecutive five-day rainfall in a year.In North China,these events account for 15%–80%of the total summer(June–August)rainfall amount and pose a great challenge for subseasonal-to-seasonal forecasting.Based on data analyses during 1979–2023,this study shows the interannual variability of AMRE is significantly influenced by the phase and amplitude mode of the annual cycle of the East Asian summer monsoon(EASM),characterized by two orthogonal patterns of southeasterly winds at 850 h Pa over the northwestern Pacific.The EASM phase-locked AMRE shows heavy rainfall events occurring extremely early and late in Beijing and surrounding areas,corresponding to the peak southeasterly wind anomalies in June and August.The EASM amplitude-locked AMRE exhibits extreme heavy or light rainfall over southwest areas with normal phase.Therefore,AMRE has a potential predictability on the seasonal time scale due to its phase-and amplitude-locking with the slow variation of the annual cycle of the EASM. 展开更多
关键词 annual maximum rainfall event North China phase-locking annual cycle East Asian summer monsoon interannual variability
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Improving Extened-range Prediction of Midsummer Maximum Temperature over Southern China Using a Dynamical Downscaling Approach 认领 引用
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作者 XU Wei-ping CHEN Li-juan +2 位作者 BO Zhong-kai GU Wei-zong ZUO Jin-qing 《Journal of Tropical Meteorology》 SCIE CSCD 2025年第6期575-590,共16页
This study aims to enhance the extended-range prediction of midsummer(July) maximum temperature(Tmax)through a dynamical downscaling method. We compare the prediction skills of July Tmax over southern China between th... This study aims to enhance the extended-range prediction of midsummer(July) maximum temperature(Tmax)through a dynamical downscaling method. We compare the prediction skills of July Tmax over southern China between the NCEP Climate Forecast System version 2(CFSv2) and a high-resolution Weather Research and Forecasting(WRF) model,using gridded Tmax observation data and ERA5 reanalysis data as benchmarks. The WRF model is driven by CFSv2 multi-member ensemble hindcast and forecast data. Results indicate that the WRF model improves Tmax prediction across China, with particularly significant enhancement over the southern region of the middle and lower reaches of the Yangtze River, although a systematic cold bias remains. By applying bias correction to the daily Tmax simulations from both models, we find that the corrected WRF predictions exhibit marked improvement for both the annual and extended-range Tmax. Furthermore, this study explores the physical mechanisms contributing to the improved predictability in the regional model. The WRF model, with its refined physical parameterization schemes, better simulates middle to lower tropospheric geopotential height fields, as well as surface sensible and latent heat fluxes. These results demonstrate that the dynamical downscaling approach can significantly improve the temperature prediction in southern China, highlighting the potential applicational value of this method for extended-range high-temperature forecasting. 展开更多
关键词 maximum temperature global climate model weather research and forecasting model dynamical downscaling extended-range
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Delay bounded routing with the maximum belief degree for dynamic uncertain networks 认领 引用
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作者 MA Ji KANG Rui +3 位作者 LI Ruiying ZHANG Qingyuan LIU Liang WANG Xuewang 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2025年第1期127-138,共12页
Delay aware routing is now widely used to provide efficient network transmission. However, for newly developing or developed mobile communication networks(MCN), only limited delay data can be obtained. In such a netwo... Delay aware routing is now widely used to provide efficient network transmission. However, for newly developing or developed mobile communication networks(MCN), only limited delay data can be obtained. In such a network, the delay is with epistemic uncertainty, which makes the traditional routing scheme based on deterministic theory or probability theory not applicable. Motivated by this problem, the MCN with epistemic uncertainty is first summarized as a dynamic uncertain network based on uncertainty theory, which is widely applied to model epistemic uncertainties. Then by modeling the uncertain end-toend delay, a new delay bounded routing scheme is proposed to find the path with the maximum belief degree that satisfies the delay threshold for the dynamic uncertain network. Finally, a lowEarth-orbit satellite communication network(LEO-SCN) is used as a case to verify the effectiveness of our routing scheme. It is first modeled as a dynamic uncertain network, and then the delay bounded paths with the maximum belief degree are computed and compared under different delay thresholds. 展开更多
关键词 dynamic uncertain network uncertainty theory epistemic uncertainty delay bounded routing maximum belief degree
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Novel two⁃stage preflow algorithm for solving the maximum flow problem in a network with circles 认领 引用
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作者 DANG Yaoguo HUANG Jinxin +1 位作者 DING Xiaoyu WANG Junjie 《Journal of Southeast University(English Edition)》 EI CAS 2025年第1期91-100,共10页
The presence of circles in the network maximum flow problem increases the complexity of the preflow algorithm.This study proposes a novel two-stage preflow algorithm to address this issue.First,this study proves that ... The presence of circles in the network maximum flow problem increases the complexity of the preflow algorithm.This study proposes a novel two-stage preflow algorithm to address this issue.First,this study proves that at least one zero-flow arc must be present when the flow of the network reaches its maximum value.This result indicates that the maximum flow of the network will remain constant if a zero-flow arc within a circle is removed;therefore,the maximum flow of each network without circles can be calculated.The first stage involves identifying the zero-flow arc in the circle when the network flow reaches its maximum.The second stage aims to remove the zero-flow arc identified and modified in the first stage,thereby producing a new network without circles.The maximum flow of the original looped network can be obtained by solving the maximum flow of the newly generated acyclic network.Finally,an example is provided to demonstrate the validity and feasibility of this algorithm.This algorithm not only improves computational efficiency but also provides new perspectives and tools for solving similar network optimization problems. 展开更多
关键词 network with circles maximum flow zeroflow arc two-stage preflow algorithm
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An Online Exploratory Maximum Likelihood Estimation Approach to Adaptive Kalman Filtering 认领 引用 被引量：4
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作者 Jiajun Cheng Haonan Chen +2 位作者 Zhirui Xue Yulong Huang Yonggang Zhang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第1期228-254,共27页
Over the past few decades, numerous adaptive Kalman filters(AKFs) have been proposed. However, achieving online estimation with both high estimation accuracy and fast convergence speed is challenging, especially when ... Over the past few decades, numerous adaptive Kalman filters(AKFs) have been proposed. However, achieving online estimation with both high estimation accuracy and fast convergence speed is challenging, especially when both the process noise and measurement noise covariance matrices are relatively inaccurate. Maximum likelihood estimation(MLE) possesses the potential to achieve this goal, since its theoretical accuracy is guaranteed by asymptotic optimality and the convergence speed is fast due to weak dependence on accurate state estimation.Unfortunately, the maximum likelihood cost function is so intricate that the existing MLE methods can only simply ignore all historical measurement information to achieve online estimation,which cannot adequately realize the potential of MLE. In order to design online MLE-based AKFs with high estimation accuracy and fast convergence speed, an online exploratory MLE approach is proposed, based on which a mini-batch coordinate descent noise covariance matrix estimation framework is developed. In this framework, the maximum likelihood cost function is simplified for online estimation with fewer and simpler terms which are selected in a mini-batch and calculated with a backtracking method. This maximum likelihood cost function is sidestepped and solved by exploring possible estimated noise covariance matrices adaptively while the historical measurement information is adequately utilized. Furthermore, four specific algorithms are derived under this framework to meet different practical requirements in terms of convergence speed, estimation accuracy,and calculation load. Abundant simulations and experiments are carried out to verify the validity and superiority of the proposed algorithms as compared with existing state-of-the-art AKFs. 展开更多
关键词 Adaptive Kalman filtering coordinate descent maximum likelihood estimation mini-batch optimization unknown noise covariance matrix
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Redox condition changes in the Ross Sea, Antarctica, since the last glacial maximum 认领 引用
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作者 Yizhuo Wang Yi Zhang +7 位作者 Xibin Han Li Lin Yukai Hong Rui Han Yun Liu Pengyun Ma Qian Ge Xiaohu Li 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2025年第4期20-34,共15页
Research on changes in the redox conditions of bottom waters is essential for understanding deep water circulation,global ocean currents,climate change,and ecosystem health.Through sedimentary geological methods,a dee... Research on changes in the redox conditions of bottom waters is essential for understanding deep water circulation,global ocean currents,climate change,and ecosystem health.Through sedimentary geological methods,a deeper understanding of the complex relationships between various environmental changes can be achieved,providing detailed evidence and theoretical support for global climate change research.The Ross Sea in Antarctica plays a key role in the formation of Antarctic bottom water(AABW),and the complex climate changes since the last glacial maximum(LGM)make it particularly significant for study.This research analyzes core ANT32-RB16C from the Ross Sea using geochemical proxies such as major and trace elements,grain size,and redox-sensitive indicators like Mn/Ti,Co/Ti,Mo/Ti,Cd/Ti,U/Th,and Ni/Co molar concentration ratios.Combining this data with a previously established chronological framework,the study explores the evolution of redox conditions in the Ross Sea’s deep waters since the LGM.The results show that the deep waters have remained oxygen-rich since the LGM,with significant changes in four stages.Stage 1(24.7–15.7 cal ka BP):Strong oxidizing conditions,likely due to enhanced formation of Ross Sea bottom water(RSBW),increasing oxygen levels.Stage 2(15.7–4.5 cal ka BP):Weakened oxidizing conditions as temperatures rose and ice shelves retreated,increasing primary productivity and depleting oxygen.Stage 3(4.5–1.5 cal ka BP):Continued decline in oxidizing conditions,possibly linked to high primary productivity and oxygen consumption.Stage 4(1.5 cal ka BP to present):A rapid recovery of oxidizing conditions,likely driven by temperature drops,increased RSBW formation,and decreased productivity. 展开更多
关键词 redox environment Ross Sea last glacial maximum bottom waters geochemical redox-sensitive element proxies
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Maximum likelihood estimation of the parameters of weighted exponential distribution in simple random sampling and ranked set sampling 认领 引用
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作者 DENG Cui-hong CHEN Wang-xue +1 位作者 ZHOU Ya-wen YANG Rui 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2025年第4期818-832,共15页
Weighted exponential distribution W ED(α,λ)with shape parameterαand scale parameterλpossesses some good properties and can be used as a good fit to survival time data compared to other distributions such as gamma,... Weighted exponential distribution W ED(α,λ)with shape parameterαand scale parameterλpossesses some good properties and can be used as a good fit to survival time data compared to other distributions such as gamma,Weibull,or generalized exponential distribution.In this article,we proved the existence and uniqueness of the maximum likelihood estimator(MLE)of the parameters of W ED(α,λ)in simple random sampling(SRS)and provided explicit expressions for the Fisher information number in SRS.Moreover,we also proved the existence and uniqueness of the MLE of the parameters of W ED(α,λ)in ranked set sampling(RSS)and provided explicit expressions for the Fisher information number in RSS.Simulation studies show that these MLEs in RSS can be real competitors for those in SRS. 展开更多
关键词 simple random sampling ranked set sampling maximum likelihood estimator Fisher information number
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