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Dynamic stress concentration in an infinitely long cylindrical cavity due to a point spherical source embedded within a fluid-saturated poroelastic formation of infinite extent

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Applied mathematics and Mechanics(English Edition) 2025年第1期46卷 139-156页

作者： h.hoSSEINI o.BALILAShAKI Department of Mechanical Engineering Faculty of EngineeringGolestan University

The effects of a harmonically exciting monopole source on an infinitely long cylindrical cavity embedded entirely within a fluid-saturated poroelastic formation of infinite extent are examined theoretically. It is assumed that the source is located outside the cavity at a specified distance from the borehole axis. The magnitudes of the hoop and radial stresses beside the pore pressures exerted on the interface and inside the porous medium surrounding the borehole are calculated and discussed. Biot's poroelastic modeling along with three types of boundary conditions for the cylindrical interface including the ideal fluid, empty borehole, and rigid inclusion with a hard boundary is employed for the analysis. Utilizing a proper translational addition theorem for expressing the incident spherical wave in terms of cylindrical wave expansions, the proposed boundary conditions at the interface are satisfied. Stresses are formulated by means of wave potential functions in a three-dimensional(3D) manner. The effects of the frequency and the radial distance between the source and borehole on the induced stresses are examined for the first cylindrical modes over frequency spectra. Two permeability conditions for the interface and three types of soils for the porous formation are considered throughout the analysis. To give an overall outline of the study, a numerical example is presented. The results clearly indicate that the distance is a key parameter and has considerable effects on the induced stress values. In addition, the interface permeability condition and soil characteristics play an important role in determining the dynamic response of the borehole. Finally,the obtained results are compared with the relevant analyses existing in the literature for some limit cases, and good agreement is achieved.

关键词： cylindrical cavity o353.4 point source porous medium stress concentration wave-field transformation

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Co_(0.5)Zn_(0.5)Fe_(2)o_(4)modified residual carbon as an excellent microwave absorber

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International Journal of Minerals,Metallurgy and materials 2025年第3期32卷 534-545页

作者： Yuanchun Zhang Dacheng ma Xingzhao Zhang Chuanlei Zhu Shengtao Gao School of Chemical and Blasting Engineering Anhui University of Science and TechnologyHuainan 232001China Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining Anhui University of Science and TechnologyHuainan 232001China

Microwave absorbers have great potential for military and civil ***,Co_(0.5Z)n_(0.5)Fe_(2)o_(4)/residual carbon(CZFo/RC)composites have been successfully prepared using a hydrothermal *** was derived from coal gasification fine slag(CGFS)via pickling,which removes inorganic *** test means have been used to study the chemical composition,crys-tal structure,and micromorphology of the CZFo/RC composites,as well as their electromagnetic parameters and microwave absorption(ma)*** CZFo/RC composites exhibit excellent ma performance owing to their dielectric and magnetic *** the thickness of CZFo/RC-2(FeCl_(3)·6h_(2)o of 0.007 mol,ZnCl_(2)of 0.00175 mol,and CoCl_(2)·6h_(2)o of 0.00175 mol)is 1.20 mm,the minimum reflection loss(RL_(min))is-56.24 dB,whereas at a thickness of 3.00 mm and 6.34 Ghz,RL_(min) is-45.96 dB and the maximum effective ab-sorption bandwidth is 1.83 Ghz(5.53-7.36 Ghz).Dielectric loss includes interface and dipole polarizations,while magnetic loss includes current and remnant magnetic ***/RC-2 exhibits high impedance matching,allowing microwave to enter the *** com-puter simulation technology confirms that CZFo/RC-2 considerably decreases the radar *** study can be used to promote the use of CGFS as electromagnetic wave(EMW)-absorbing materials.

关键词： cobalt-zinc ferrite residual carbon microwave absorption coal gasification fine slag coal-based solid waste

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Ingenious construction of a magnetic-recyclable photo-Fenton catalyst ZnFe_(2)o_(4)@MIL-88A(Fe)and its adsorption-degradation activity toward levofloxacin

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Journal of Environmental Sciences 2025年第5期151卷 677-691页

作者： Xichen Mi Tingwei Wang Yitong Chen Dan cao Na ma Wei Dai Key Laboratory of the Ministry of Education for Advanced catalysis materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China Jinhua Customs Comprehensive Technology Service Center Jinhua 321004China College of Geography and Environmental Sciences Zhejiang Normal UniversityJinhua 321004China

Monotonic pore size and particles inseparability of metal-organic frameworks(MoFs)caused serious effects on its light absorption ability and charge separation,restricting its application for antibiotic such as levofloxacin(LEV)degradation in *** this study,a magnetically detachable nano-photocatalyst(ZnFe_(2)o_(4)@MIL-88A(Fe))was synthesized using a simple two-step hydrothermal *** morphology and microstructure analyses showed that n-type ZnFe_(2)o_(4)catalyst particleswere efficiently assembled onto the surface of MIL-88A(Fe)*** activity studies indicated that the ZnFe_(2)o_(4)@MIL-88A(Fe)plus h_(2)o_(2)exhibiting a significantly boosted photo-Fenton activity toward LEV at visible light irradiation,compared to the pure ZnFe_(2)o_(4)and MIL-88A(Fe),the degradation efficiency accordingly reached up to nearly 82%and 25%within 60 *** excellent photocatalytic performance was ascribed to the synergistic effects of the heterogeneous structure of ZnFe_(2)o_(4)and MIL-88A(Fe),whereby the efficient separation of charge carriers in the catalytic system is mutually reinforced with the efficient reduction of Fe^(3+)and Fe^(2+).Meanwhile,the degradationmechanism and intermediates of LEV during the photo-Fenton reaction process were also studied in depth through free radical burst,electron paramagnetic resonance,and mass spectrometry analyses,***,the ZnFe_(2)o_(4)@MIL-88A(Fe)composite catalyst displayed significant stability and ease of separation,indicating potential for the photooxidative degradation of organic pollutants.

关键词： ZnFe_(2)o_(4) MIL-88A(Fe) magnetism Photo-Fenton Levofloxacin

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Prediction of velocity and pressure of gas-liquid flow using spectrum-based physics-informed neural networks

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Applied mathematics and Mechanics(English Edition) 2025年第2期46卷 341-356页

作者： Nanxi DING hengzhen FENG h.Z. LoU Shenghua FU Chenglong LI Zihao ZhANG Wenlong ma Zhengqian ZhANG School of Mechanical Engineering Beijing Institute of Technology University of Southern california Xi'an Institute of Electromechanical Information Technology

This research introduces a spectrum-based physics-informed neural network (SP-PINN) model to significantly improve the accuracy of calculation of two-phase flow parameters, surpassing existing methods that have limitations in global and continuous data sampling. SP-PINNs address the challenges of traditional methods in terms of continuous sampling by integrating the spectral analysis and pressure correction into the Navier-Stokes (N-S) equations, enhancing the predictive accuracy especially in critical regions like gas-phase boundaries and velocity peaks. The novel introduction of a pressure-correction module within SP-PINNs mitigates prediction errors, achieving a substantial reduction to 1‰compared with the conventional physics-informed neural network (PINN) approaches. Experimental applications validate the model’s ability to accurately and rapidly predict flow parameters with different sampling time intervals,with the computation time of predicting unsampled data less than 0.01 s. Such advancements signify a 100-fold improvement over traditional DNS calculations, underscoring the model’s potential in the real-time calculation and analysis of multiphase flow dynamics.

关键词： physics-informed neural network (PINN) spectral method two-phase flow parameter prediction o359

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Electronic modulation induced by coupling Ruo2 with electron-donating Co3o4 for high-active and long-life rechargeable Zn-air batteries

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Journal of Energy Chemistry 2025年第2期101卷 99-109页

作者： Xuena ma Zhangxin Xu Mingyang Liu Panzhe Qiao Qi Li Ruihong Wang Baojiang Jiang Key Laboratory of Functional Inorganic material Chemistry Ministry of Education of the People's Republic of China School of Chemistry and Materials ScienceHeilongjiang University Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences

Electronic-state modulation strategy offers great potential in designing Ruo2-based bifunctionalelectrocatalysts for rechargeable Zn-air batteries（ZABs）.Various three-dimensional（3D） transition metal oxides are attempted to couple with Ruo2for constructing an appropriate Ru—o—M *** work aims to construct Co3o4-Ruo2heterostructures on carbon sheets（Co3o4/Ruo2/NCNS） for boosting electronic transfer and *** and theoretical calculations identify the electronic transfer from Co3o4to Ruo2that modulates the electronic structure of metal surfaces/***,it leads to the increase in Co3+content,electron-rich state at Ruo2surface and electronic accumulation at ***,this electronic-state modulation optimizes the d-band center in Co3o4/Ruo2that lowers the reaction barriers and endows interfaces as the biggest contributor to oxygen reduction reaction（oRR） and oxygen evolution reaction（oER） performance,The Co3o4/Ruo2/NCNS shows a quite low potential difference of 0.62 V and remarkable durability for oRR/***3o4/Ruo2/NCNS-assembled ZABs exhibit an excellent specific capacity of 818.3 ma h g-1and a superior lifespan over 750 h.

关键词： Charge-discharge stability Co3o4-Ruo2 heterostructure Electronic modulation Reaction energy barrier Zn-air battery

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Combining slow-release fertilizer and plastic film mulching reduced the carbon footprint and enhanced maize yield on the Loess Plateau

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Journal of Environmental Sciences 2025年第1期147卷 359-369页

作者： Xiaoqing han Pengfei Dang Lechen Liao Fangqi Song Miaomiao Zhang maoxue Zhang Guoqing Li Shuyue Wen Ning Yang Xiping Pan Xiaofan Wang WenWang Xiaoliang Qin Charles o.Joseph Kadambot h.M.Siddique College of Agronomy Key Laboratory of Crop Physi-ecology and Tillage Science in Northwestern Loess PlateauNorthwest A&F UniversityYanglingShaanxi 712100China Department of Crop Sciences and Beekeeping Technology College of Agricultural Sciences and Food Technology University of Dar es SalaamMwalimu Julius Nyerere Mlimani CampusP.O.Box 35091Dar es SalaamTanzania College of Life Science Yulin UniversityChongwen Road No.4YulinShaanxi719000China The UWA Institute of Agriculture and School of Agriculture&Environment The University of Western AustraliaPerth WA 6001Australia

Agricultural practices significantly contribute to greenhouse gas(GhG)emissions,necessitating cleaner production technologies to reduce environmental pressure and achieve sustainable maize *** film mulching is commonly used in the Loess Plateau *** slow-release fertilizers as a replacement for urea within this practice can reduce nitrogen losses and enhance crop *** these techniques represents a novel agricultural approach in semi-arid ***,the impact of this integration on soil carbon storage(SoCS),carbon footprint(CF),and economic benefits has received limited research ***,we conducted an eight-year study(2015-2022)in the semi-arid northwestern region to quantify the effects of four treatments[urea supplied without plastic film mulching(CK-U),slow-release fertilizer supplied without plastic film mulching(CK-S),urea supplied with plastic film mulching(PM-U),and slow-release fertilizer supplied with plastic film mulching(PM-S)]on soil fertility,economic and environmental *** results revealed that nitrogen fertilizer was the primary contributor to total GhG emissions(≥71.97%).Compared to other treatments,PM-S increased average grain yield by 12.01%-37.89%,water use efficiency by 9.19%-23.33%,nitrogen accumulation by 27.07%-66.19%,and net return by 6.21%-29.57%.Furthermore,PM-S decreased CF by 12.87%-44.31%and CF per net return by 14.25%-41.16%.After eight years,PM-S increased SoCS(0-40 cm)by 2.46%,while PM-U decreased it by 7.09%.These findings highlight the positive effects of PM-S on surface soil fertility,economic gains,and environmental benefits in spring maize production on the Loess Plateau,underscoring its potential for widespread adoption and application.

关键词： Plastic film mulching Slow-release fertilizer maize grain yield carbon footprint Economic benefits

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Effect of Cu/hZSM-5 sorbents with different Si/Al ratios on the adsorption and oxidation performance of h_(2)S

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Journal of Environmental Sciences 2025年第5期151卷 161-173页

作者： Kaini ma Kai Li Ping Ning Jiayu Feng Jiacheng Bao Lei Shi Xiangyu Wang Xin Sun Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries Kunming University of Science and TechnologyKunming 650500China

This study employed a wet impregnation method to synthesize five types of Cu/hZSM-5 adsorbents with Si/Al ratios of 25,50,85,200,and 300,used for the removal of h_(2)S in lowtemperature,low-oxygen *** impact of different Si/Al ratios on the adsorption oxidative performance of Cu_(30)/hZSM-5–85 adsorbents was *** to the performance test results,Cu_(30)/hZSM-5–85 exhibited the highest breakthrough capacity,reaching 231.75 mg h_(2)S/g_(sorbent).Cu/hZSM-5 sorbent maintains a strong ability to remove h_(2)S even under humid conditions and shows excellent water ***,BET,and XPS results revealed that Cuo is the primary active species,with Cu_(30)/hZSM-5–85 having the largest surface area and highest Cuo content,providing more active sites for h_(2)S adsorption.h_(2)-TPR and o_(2)-TPD results confirmed that Cu_(30)/hZSM-5–85 sorbent exhibits outstanding redox properties and oxygen storage capacity,contributing to excellent oxygen transferability in the molecular sieve adsorption-oxidation *** notable characteristics such as a large surface area,high desulfurization efficiency,and water resistance,Cu_(30)/hZSM-5–85 sorbents hold significant importance for industrial applications.

关键词： h_(2)S Si/Al ratio Adoration-oxidation Cu/hZSM-5-85(hZSM-5 with Si/Al ratio of 85 loaded Cu)

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oxygen vacancies-rich molybdenum tungsten oxide nanowires as a highly active nitrogen fixation electrocatalyst

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Chinese Chemical Letters 2025年第1期36卷 545-548页

作者： Jincheng Zhang Mengjie Sun Jiali Ren Rui Zhang Min ma Qingzhong Xue Jian Tian School of materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

herein,vacancy engineering is utilized reasonably to explore molybdenum tungsten oxide nanowires(W_(4)Moo_(3)NWs)rich in o-vacancies as an advanced electrochemical nitrogen reduction reaction(eNRR)electrocatalyst,realizing further enhancement of NRR *** 0.1 mol/L Na_(2)So_(4),W_(4)Moo_(3)NWs rich in o vacancies(CTAB-D-W_(4)Moo_(3))achieve a large Nh3yield of 60.77μg h^(-1)mg^(-1)***-0.70 V *** and a high faradaic efficiency of 56.42%at-0.60 V,much superior to the W_(4)Moo_(3)NWs deficient in oxygen vacancies(20.26μg h^(-1)mg^(-1)*** 17.1%at-0.70 V ***).Meanwhile,W_(4)Moo_(3)NWs rich in o-vacancies also show high electrochemical *** functional theory(DFT)calculations present that o vacancies in CTAB-D-W_(4)Moo_(3)reduce the energy barrier formed by the intermediate of^(*)N-Nh,facilitate the activation and further hydrogenation of^(*)N-N,promote the NRR process,and improve NRR activity.

关键词： Electrocatalytic N_(2) reduction reaction Molybdenum-tungsten oxide Nanowires oxygen vacancies Non-noble metal

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Seasonal influence on miRNA expression dynamics of extracellular vesicles in equine follicular fluid

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Journal of Animal Science and Biotechnology 2025年第1期16卷 136-152页

作者： Jean M.Feugang Ahmed Gad Nico G.Menjivar Ghassan M.Ishak Samuel Gebremedhn Melba o.Gastal Notsile h.Dlamini Radek Prochazka Eduardo L.Gastal Dawit Tesfaye Department of Animal and Dairy Sciences Mississippi State UniversityMississippi StateMS 39762USA Animal Reproduction and Biotechnology Laboratory(ARBL) Department of Biomedical SciencesCollege of Veterinary Medicine and Biomedical SciencesColorado State UniversityFort CollinsCO 80523USA Department of Animal Production Faculty of AgricultureCairo UniversityGiza 12613Egypt Department of Surgery and obstetrics College of Veterinary MedicineUniversity of BaghdadBaghdad 10011Iraq Animal Science School of Agricultural SciencesSouthern Illinois UniversityCarbondaleIL 62901USA J.R.Simplot Company KunaID 83634USA Institute of Animal Physiology and Genetics Czech Academy of SciencesLiběchov 27721Czech Republic

Background ovarian follicular fluid(FF)is a dynamic environment that changes with the seasons,affecting follicle development,ovulation,and oocyte *** in the follicles release tiny particles called extracellular vesicles(EVs)containing vital regulatory molecules,such as microRNAs(miRNAs).These miRNAs are pivotal in facilitating commu-nication within the follicles through diverse signaling and information transfer ***-coupled miRNA signaling is implicated to be associated with ovarian function,follicle and oocyte growth and response to various environmen-tal ***,we investigated how seasonal variations directly influence the ovulatory and anovulatory states of ovarian follicles and how are they associated with follicular fluid EV-coupled miRNA dynamics in *** Ultrasonographic monitoring and follicular fluid aspiration of preovulatory follicles in horses during the ano-vulatory(spring:non-breeding)and ovulatory(spring,summer,and fall:breeding)seasons and subsequent EV isola-tion and miRNA profiling identified significant variation in EV-miRNA cargo *** identified 97 miRNAs with dif-ferential expression among the groups and specific clusters of miRNAs involved in the spring transition(miR-149,-200b,-206,-221,-328,and-615)and peak breeding period(including miR-143,-192,-451,-302b,-100,and let-7c).Bioinformatic analyses showed enrichments in various biological functions,e.g.,transcription factor activity,transcrip-tion and transcription regulation,nucleic acid binding,sequence-specific DNA binding,p53 signaling,and post-trans-lational *** analyses revealed distinct sets of significantly up-and down-regulated miRNAs associ-ated with spring anovulatory(Cluster 1)and summer ovulation–the peak breeding season(Clusters 4 and 6).Conclusions The findings from the current study shed light on the dynamics of FF-EV-coupled miRNAs in relation to equine ovulatory and anovulatory seasons,and their roles in understanding the

关键词： Extracellular vesicle Follicle growth Follicular fluid horse mare ovulation Pre-ovulation Seasonal breeding

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A binary eutectic electrolyte design for high-temperature interface-compatible Zn-ion batteries

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Journal of Energy Chemistry 2025年第2期101卷 587-597页

作者： Guomin Li Wentao Wen Kefeng ouyang Yanyi Wang Jianhui Zhu Ming Yang hongwei Mi Ning Zhao Peixin Zhang Dingtao ma College of Chemistry and Environmental Engineering Shenzhen University School of materials Science and Engineering Harbin Institute of Technology (Shenzhen) School of materials and Environmental Engineering Shenzhen Polytechnic Guangdong Flexible Wearable Energy and Tools Engineering Technology Research Center

The deterioration of aqueous zinc-ion batteries（AZIBs） is confronted with challenges such as unregulated Zn2+diffusion,dendrite growth and severe decay in battery performance under harsh ***,a design concept of eutectic electrolyte is presented by mixing long chain polymer molecules,polyethylene glycol dimethyl ether（PEGDME）,with h2o based on zinc trifluoromethyl sulfonate(Zn（oTf）2),to reconstruct the Zn2+solvated structure and in situ modified the adsorption layer on Zn electrode *** dynamics simulations（MD）,density functional theory（DFT） calculations were combined with experiment to prove that the long-chain polymer-PEGDME could effectively reduce side reactions,change the solvation structure of the electrolyte and priority absorbed on Zn（002）,achieving a stable dendrite-free Zn *** to the comprehensive regulation of solvation structure and zinc deposition by PEGDME,it can stably cycle for over 3200 h at room temperature at 0.5 ma/cm2and 0.5 mah/*** at high-temperature environments of 60℃,it can steadily work for more than 800 cycles（1600 h）.Improved cyclic stability and rate performance of aqueous Zn‖Vo2batteries in modified electrolyte were also achieved at both room and high *** that,the demonstration of stable and high-capacity Zn‖Vo2pouch cells also implies its practical application.

关键词： Dendrite suppression Eutectic electrolyte high temperature Solvation structure Zn anode

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