MULTIFRACTAL

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Impact of atmospheric O_(3)and NO_(2)on the secondary sulfates in real atmosphere
《Journal of Environmental Sciences》2025年第4期277-287,共11页Kai Shi Xiaoli Mei Chih-rung Chen Chunqiong Liu 
supported by the National Natural Science Foundation of China(No.52160024);the Natural Science Foundation of Hunan Province,China(No.2022JJ30475);the Innovation Team Funds of China West Normal University(No.KCXTD2023-4);the Natural Science Foundation of Sichuan,China(No.24NSFSC0537);the Fundamental Research Funds of China West Normal University(Nos.22kE015 and 22kE016).
As an important component of secondary aerosols,sulfate plays a crucial role in regulating atmospheric radiative balance and influencing the secondary formation of ozone(O_(3)).In real atmosphere,atmospheric oxidants ...
关键词：SULFATE Nitrogen dioxide OZONE Multifractal detrended cross-correlation analysis Hong Kong 
MULTIFRACTAL ANALYSIS OF CONVERGENCE EXPONENTS FOR PRODUCTS OF CONSECUTIVE PARTIAL QUOTIENTS IN CONTINUED FRACTIONS
《Acta Mathematica Scientia》2024年第4期1594-1608,共15页Lulu FANG Jihua MA Kunkun SONG Xin YANG 
supported by the Scientific Research Fund of Hunan Provincial Education Department(21B0070);the Natural Science Foundation of Jiangsu Province(BK20231452);the Fundamental Research Funds for the Central Universities(30922010809);the National Natural Science Foundation of China(11801591,11971195,12071171,12171107,12201207,12371072)。
For each real number x∈(0,1),let[a_(1)(x),a_(2)(x),…,a_n(x),…]denote its continued fraction expansion.We study the convergence exponent defined byτ(x)=inf{s≥0:∞∑n=1(a_(n)(x)a_(n+1)(x))^(-s)<∞},which reflects t...
关键词：continued fractions product of partial quotients Hausdorff dimension 
Multifractal estimation of NMR T_(2) cut-off value in low-permeability rocks considering spectrum kurtosis: SMOTE-based oversampling integrated with machine learning被引量：1
《Petroleum Science》2023年第6期3411-3427,共17页Xiao-Jun Chen Rui-Xue Zhang Xiao-Bo Zhao Jun-Wei Yang Zhang-Jian Lan Cheng-Fei Luo Jian-Chao Cai 
supported by National Natural Science Foundation of China(Nos.42002171,42172159);China Postdoctoral Science Foundation(Nos.2020TQ0299,2020M682520);Postdoctoral Innovation Science Foundation of Hubei Province of China.
The transverse relaxation time (T_(2)) cut-off value plays a crucial role in nuclear magnetic resonance for identifying movable and immovable boundaries, evaluating permeability, and determining fluid saturation in pe...
关键词：Nuclear magnetic resonance Low-permeability porous media T_(2)cut-off value Fractal and multifractal Data augmentation Machine learning 
Extreme Risk Measurement of Carbon Market Considering Multifractal Characteristics
《Journal of Systems Science & Complexity》2023年第6期2497-2514,共18页ZHU Dandan ZHANG Chen PAN Di 
supported by the National Natural Science Foundation of China under Grant No.71971071。
Influenced by the global economy,politics,energy and other factors,the price of carbon market fluctuates sharply.It is of great practical significance to explore a suitable measurement method of extreme risk of carbon...
关键词：Carbon market extreme value theory MULTIFRACTAL Skewed-t distribution VAR 
Analysis of the USD/JPY and EUR/JPY Exchange Rates Using Multifractal Analysis and Extreme Value Theory
《Journal of Applied Mathematics and Physics》2023年第10期2816-2827,共12页Fumio Maruyama 
We performed a multifractal analysis using wavelet transform to detect the changes in the fractality of the USD/JPY and EUR/JPY exchange rates, and predicted their extreme values using extreme value theory. After the ...
关键词：WAVELET MULTIFRACTAL Extreme Value Theory GP USD/JPY and EUR/JPY Ex-change Rates 
Contact Angle Prediction Model for Underwater Oleophobic Surfaces Based on Multifractal Theory
《China Petroleum Processing & Petrochemical Technology》2023年第3期37-48,共12页Jiang Huayi You Yanzhen Hu Juan Tian Dongmei Qi Hongyuan Sun Nana Liu Mei 
the Natural Science Basic Research Program of Shaanxi(Program No.2023-JC-YB-351);the Scientific Research Program Funded by the Shaanxi Provincial Education Department(Program No.20JS118);the Xi’an Shiyou University Graduate Innovation and Practice Ability Training Plan(YCS21212097,YCS21212092).
Traditional microstructure scale parameters have difficulty describing the structure and distribution of a roughmaterial’s surface morphology comprehensively and quantitatively. This study constructs hydrophilic and ...
关键词：contact angle hydrophilic-oleophobic surface polyvinylidene fluoride MULTIFRACTAL prediction model 
Correlation analysis between the Aral Sea shrinkage and the Amu Darya River被引量：1
《Journal of Arid Land》2023年第7期757-778,共22页WANG Min CHEN Xi CAO Liangzhong KURBAN Alishir SHI Haiyang WU Nannan EZIZ Anwar YUAN Xiuliang Philippe DE MAEYER 
supported by the National Natural Science Foundation of China (42230708);the Joint CAS (Chinese Academy of Sciences) & MPG (Max-Planck-Gesellschaft) Research Project (HZXM20225001MI);the Tianshan Talent Project of Xinjiang Uygur Autonomous Region, China (2022TSYCLJ0056)。
The shrinkage of the Aral Sea,which is closely related to the Amu Darya River,strongly affects the sustainability of the local natural ecosystem,agricultural production,and human well-being.In this study,we used the B...
关键词：Aral Sea shrinkage recharge runoff Amu Darya River Syr Darya River multifractal detrend cross-correlation analysis(MF-DCCA) Bayesian Estimator of Abrupt change Seasonal change and Trend(BEAST) Central Asia 
A Comparison of Wavelet Packet,Wavelet Leaders Multifractal,and p‑Leader Multifractal Method in Chatter Detection
《Nanomanufacturing and Metrology》2023年第2期11-18,共8页Zehui Zheng Xiubing Jing Yangyang Wang Xiaofei Song Huaizhong Li 
supported by Program of Tianjin Science and Technology(No.21ZXJBGX00020);the National Natural Science Foundation of China(Nos.51875404,52175275).
An efficient stability analysis contributes to the improvement of machining stability and chatter suppression.First,this paper presents three chatter detection approaches that were developed on the application of wave...
关键词：Chatter PLMM WLMM WPM 
Application of fractal theory to study morphology of manganese sulfide inclusion in resulfurized free-cutting steels被引量：1
《Journal of Iron and Steel Research International》2023年第1期137-149,共13页Xiang-yu Xu Zhi-qi Zeng Qian-ren Tian Chen-wei Cao Ping Shen Jian-xun Fu 
The authors gratefully express their appreciation to National Key Research and Development Program of China (Grant No.2018YFB0704400);National Natural Science Foundation of China (Grant Nos.51874195 and 52074179)for supporting this work;support from the Youth Program of National Natural Science Foundation of China (Grant No.52104335);Shanghai "Super Postdoctoral"Incentive Plan (Grant No.2020194).
The morphology and distribution of manganese sulfide(MnS)inclusions have a significant influence on the comprehensive performance,which is an important research field for resulfurized steels.Based on the experiments o...
关键词：MnS inclusion MORPHOLOGY Fractal dimension MULTIFRACTAL Resulfurized steel 
Pore-Fracture Distribution Heterogeneity of Shale Reservoirs Determined by using HPMI and LPN_(2 )GA Tests
《Acta Geologica Sinica(English Edition)》2022年第5期1659-1672,共14页ZHANG Junjian QIN Zhengyuan HAN Yanning WANG Huaimeng HOU Maoguo YAN Gaoyuan FENG Guangjun ZHANG Xiaoyang YIN Tingting ZHANG Hainan WEN Shupeng 
funded by grants from the Natural Science Foundation of Shandong Province, China (Nos. ZR2021QD072 and ZR2020QD040)。
The compressibility of shale matrix reflects the effects of reservoir lithology, material composition, pore structure and tectonic deformation. It is important to understand the factors that influence shale matrix com...
关键词：shale reservoirs matrix compressibility pore structure fractal dimension MULTIFRACTAL 
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