期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到7篇文章
< 1 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Coal creep deformation and pore-fracture evolution under cyclic loading-unloading using NMRI and fractal analysis 认领 引用
1
作者 Wenhao Jia Hongwei Zhou +5 位作者 Fangwei Li Eryi Hu Senlin Xie Lei Zhang Zelin liu Shukai Jin 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第7期1329-1344,共16页
Understanding the creep deformation behavior and the evolution of pore-fracture structures(FPSs)in coal under cyclic loading-unloading is crucial for safe extraction and efficient methane utilization.Coal samples were... Understanding the creep deformation behavior and the evolution of pore-fracture structures(FPSs)in coal under cyclic loading-unloading is crucial for safe extraction and efficient methane utilization.Coal samples were subjected to cyclic loading-unloading creep experiments using online Nuclear Magnetic Resonance(NMR)and Nuclear Magnetic Resonance Imaging(NMRI)techniques.The results revealed the significance of instantaneous plastic and viscoplastic strains during creep,with creep failure modes analyzed using NMRI data and macroscopic fracture distribution.Viscoplastic strain was identified as a key indicator of accelerated failure,and NMRI revealed a transition from splitting-shear to V-shaped shear failure under increasing confining pressure.From a microscopic perspective,real-time T2 spectra monitoring tracked the evolution of FPS at different loading levels,and the geometric mean of the pore structure(T2g)quantitatively described the co-evolution of various pore types.A generalized model was developed to describe coal creep under cyclic loading-unloading,integrating microscopic and macroscopic deformation features and refined using fractal theory.These findings provide theoretical insights and practical guidance for coal extraction and methane management under cyclic loading-unloading creep. 展开更多
关键词 Online test Cyclicloading-unloading Pore-fracture structure Creep deformation Coal
暂未订购 下载PDF
Pre-filters design for weighted sum rate maximization in multiuser time reversal downlink systems 认领 引用
2
作者 Mingyue Wang Fangwei Li +1 位作者 Yingsong Li Shengyuan Luo 《Digital Communications and Networks》 SCIE EI CSCD 2025年第6期1908-1916,共9页
In high-speed multiuser Time Reversal(TR)downlink systems,the transmission rate is degraded due to the presence of severe inter-user and inter-symbol interference.Moreover,maximizing the weighted sum rate in such syst... In high-speed multiuser Time Reversal(TR)downlink systems,the transmission rate is degraded due to the presence of severe inter-user and inter-symbol interference.Moreover,maximizing the weighted sum rate in such systems is a critical objective,since the weighting factors represent the priority of different users in different applications.However,it faces significant challenges as it is an NP-hard and non-convex problem.In order to suppress these interferences and maximize the weighted sum rate,in this paper we present a novel approach for the joint design of the pre-filters.The proposed method applies successive convex approximation to transform the original problem into a Second-Order Cone Programming(SOCP)problem.Then,a low-complexity iterative algorithm is provided to effectively solve the resulting SOCP problem.According to the simulation results,the proposed method reaches a local optimum within a few iterations and demonstrates superior performance in terms of weighted sum rate compared to the current algorithm. 展开更多
关键词 Pre-filters design Successive convex approximation Second-order cone programming Time reversal Weighted sum rate
暂未订购 下载PDF
Enhancing chlorophyll stability by regulating charge transfer in chlorophyll self-aggregation 认领 引用
3
作者 Fangwei Li Zhaotian Yang +3 位作者 Suxia Shen Ajibola Nihmot Ibrahim Zhenhao Wang Yan Zhang 《Food Innovation and Advances》 2025年第4期454-460,共7页
Chlorophyll(Chl),a natural pigment with broad applications in food systems,faces challenges due to its instability under light exposure.This study explores the relationship between solvent polarity,charge transfer(CT)... Chlorophyll(Chl),a natural pigment with broad applications in food systems,faces challenges due to its instability under light exposure.This study explores the relationship between solvent polarity,charge transfer(CT)in Chl self-aggregation,and photostability enhancement.By adjusting ethanol/water ratios(10-100%ethanol),environmental polarity was modulated to investigate its impact on CT dynamics using fluorescence spectroscopy,conductivity analysis,and quantum chemistry calculations.Results demonstrated that higher solvent polarity significantly strengthened CT interactions between Chl molecules,primarily mediated by porphyrin rings,while the hydrophobic phytyl tail influenced aggregate configurations and indirectly modulated CT pathways.Light stability tests revealed that Chl retention in high-polarity solvents(10%-40%ethanol)surpassed low-polarity groups(60%-90%ethanol)by 213.04%and 302.61%on days 4 and 8,respectively,highlighting the critical role of CT-driven aggregation in mitigating photodegradation.Quantum calculations further elucidated that phytyl tail removal altered CT efficiency depending on porphyrin spacing:in'sandwich'dimers,phytyl absence enhanced CT,whereas in'face-to-face'configurations,partial removal optimized electron redistribution.These findings underscore solvent polarity as a key regulator of CT-mediated aggregation,offering a mechanism to stabilize Chl through non-covalent interactions.The study advances the understanding of Chl aggregation mechanisms and proposes physical strategies,such as electric-field-induced CT modulation,to enhance the stability of photosensitive natural pigments in food processing and storage. 展开更多
关键词 solvent polarity chlorophyll stability charge transfer food systemsfaces quantum chemistry calculationsresults solvent polaritycharge transfer ct photostability enhancementby fluorescence spectroscopyconductivity analysisand
暂未订购 下载PDF
Protection mechanism of β-carotene on the chlorophyll photostability through aggregation:a quantum chemical perspective 认领 引用
4
作者 Fangwei Li Suxia Shen +3 位作者 Zhaotian Yang Jinghao Zhang Ajibola Nihmot Ibrahim Yan Zhang 《Food Innovation and Advances》 2024年第3期222-231,共10页
Chlorophyll(Chl),the most widely distributed natural pigment in nature,is limited in use due to its poor stability.This study refers to the aggregation structure of Chl and carotene(Car)in natural photosynthetic syste... Chlorophyll(Chl),the most widely distributed natural pigment in nature,is limited in use due to its poor stability.This study refers to the aggregation structure of Chl and carotene(Car)in natural photosynthetic systems,hoping to improve the photostability of Chl by constructing Chl/Car aggregates.The stability protection effect of Car on Chl was explored by designing different ratios of Chl and Car aggregation systems.The configuration of Chl/Car aggregates was optimized through ab initio molecular dynamics,and the aggregation mechanism of the aggregates and the photoprotection mechanism of Chl by Car were elucidated through quantum chemical calculations and wave function analysis.Chl/Car had a 27.22% higher Chl retention rate than free Chl after 7 d of illumination,with a Chl to Car ratio of 1.66:1.A configuration of the Chl/Car aggregates which Car's conjugated olefin chain interacts extensively with the porphyrin ring and bent phytyl chain of Chl made them more stable.The photoprotective mechanism of Car on Chl in the Chl/Car aggregates is elucidated.Car's conjugated polyene chain provides HOMO orbitals to the Chl/Car aggregates.It demonstrated that Car supplies electrons in the low-lying excited states S2 and S4,indicating it is more susceptible to damage,protecting Chl.This research will promote the development of natural color formulas and ensure the health of consumers. 展开更多
关键词 ab initio molecular dynamics natural pigment photostability chlorophyll aggregation structure carotene stability protection effect photosynthetic systemshoping
暂未订购 下载PDF
A network security situation prediction model based on wavelet neural network with optimized parameters 认领 引用 被引量：18
5
作者 Haibo Zhang Qing Huang +1 位作者 Fangwei Li Jiang Zhu 《Digital Communications and Networks》 2016年第3期139-144,共6页
The security incidents ion networks are sudden and uncertain,it is very hard to precisely predict the network security situation by traditional methods.In order to improve the prediction accuracy of the network securi... The security incidents ion networks are sudden and uncertain,it is very hard to precisely predict the network security situation by traditional methods.In order to improve the prediction accuracy of the network security situation,we build a network security situation prediction model based on Wavelet Neural Network(WNN)with optimized parameters by the Improved Niche Genetic Algorithm(INGA).The proposed model adopts WNN which has strong nonlinear ability and fault-tolerance performance.Also,the parameters for WNN are optimized through the adaptive genetic algorithm(GA)so that WNN searches more effectively.Considering the problem that the adaptive GA converges slowly and easily turns to the premature problem,we introduce a novel niche technology with a dynamic fuzzy clustering and elimination mechanism to solve the premature convergence of the GA.Our final simulation results show that the proposed INGA-WNN prediction model is more reliable and effective,and it achieves faster convergence-speed and higher prediction accuracy than the Genetic Algorithm-Wavelet Neural Network(GA-WNN).Genetic Algorithm-Back Propagation Neural Network(GA-BPNN)and WNN. 展开更多
关键词 Network security INGA Situation prediction WNN Adaptive genetic algorithm
暂未订购 下载PDF
Investigation and Analysis of Nutrition Components of Wild Chives Collected from Hezhang County of Guizhou Province 认领 引用
6
作者 Haiping WANG Yang QIU +3 位作者 Fangwei LI Jiangping SONG Xiaohui ZHANG Xixiang LI 《Asian Agricultural Research》 2018年第4期93-98,共6页
Guizhou Province is an important distribution area of wild onion resources,and a large area of wild( Chinese) chives are distributed in Hezhang County. In order to understand and study the distribution of wild chives,... Guizhou Province is an important distribution area of wild onion resources,and a large area of wild( Chinese) chives are distributed in Hezhang County. In order to understand and study the distribution of wild chives,the geographical distribution,habitats and climate of wild chives in Hezhang County were investigated,and the main nutrition components of wild chives were analyzed. The results indicated that there were mainly three kinds of wild chives distributed in Hezhang County, including Allium wallichii Kunth., Allium ovalifolium Hand.-Mazz.( tentatively named),and Allium hookeri Thwaites( tentatively named). Among the 17 kinds of amino acids,except for proline,the content of other amino acids in wild chives was higher than that of the cultivated chives( Allaum tuberosum Rottler ex Spreng.). The sugar content of wild chives was significantly lower than the cultivated chives. Among nine trace elements,the manganese,zinc and iron content of A. ovalifolium Hand.-Mazz. were significantly higher than that of the cultivated chives and other wild chives. Among the four kinds of heavy metals,cadmium content in the three kinds of wild chives exceeded the limitation of the national standard,and cadmium content in A. ovalifolium Hand.-Mazz. was significantly higher than that of the others. Arsenic,mercury and lead content in A. ovalifolium Hand.-Mazz. also exceeded the limitation of the national standard. Vitamin C content in leaves and stalk of A. wallichii Kunth. in the original habits was higher than that of the cultivated chives. The biological characteristics and nutrition components of the wild chives from Hezhang County were significantly different from that of the cultivated chives. The collection and preservation of these resources are of great significance to the enriching of diversity of Chinese chive resources and has great development and utilization value to the improvement of nutritional quality of Chinese chives. 展开更多
关键词 Wild chives Cultivate chives Nutrition component
暂未订购 下载PDF
N6-methyladenosine methylation in acute lung injury: Mechanisms and research progress 认领 引用
7
作者 Yating Hu Yijie Wang +3 位作者 Xiyue Liu Xiaoli Xue Binbin Li Fangwei Li 《Journal of Intensive Medicine》 CSCD 2026年第1期28-33,共6页
N6-methyladenosine (m6A) methylation is the most prevalent and abundant internal post-transcriptional RNA modification in eukaryotic cells, playing an important regulatory role in various biological processes. The bio... N6-methyladenosine (m6A) methylation is the most prevalent and abundant internal post-transcriptional RNA modification in eukaryotic cells, playing an important regulatory role in various biological processes. The biological functions of m6A modification are dynamically and reversibly mediated by methyltransferases (writers), demethylases (erasers), and m6A binding proteins (readers). Acute lung injury (ALI) is a common critical condition characterized by diffuse edema within the pulmonary interstitium and alveoli, and is associated with high morbidity and mortality. Recent studies have identified that aberrant expression of m6A regulators is closely associated with ALI development. This review highlights the progress in research on m6A writers, erasers, and readers in ALI, focusing on their molecular regulatory mechanisms. Elucidating the molecular mechanisms of m6A and its associated proteins in ALI may reveal new therapeutic strategies and targets. 展开更多
关键词 Acute lung injury m6A RNA Methylation RNA Methylations Sepsis Acute respiratory distress syndrome
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈