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Long-time asymptotic behavior for the nonlocal nonlinear Schrödinger equation in the solitonic region

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Science China Mathematics 2025年第2期68卷 379-398页

作者： Gaozhan Li Yiling yang Engui Fan School of Mathematical Sciences and Key Laboratory of Mathematics for Nonlinear Sciences Fudan UniversityShanghai 200433China

In this paper,we extend theδ^(-)-steepest descent method to study the Cauchy problem for the nonlocal nonlinear Schrödinger(NNLS)equation with weighted Sobolev initial data iqt+qxx+2σq^(2)(x,t)q(−x,t)=0,q(x,0)=q0(x),where q0∈H^(1,1)(R).Based on the spectral analysis of the Lax pair,the solution of the Cauchy problem is expressed in terms of the solution of a Riemann-Hilbert problem,which is transformed into a solvable model after a series of *** further obtain the asymptotic expansion of the solution to the Cauchy problem for the NNLS equation in the solitonic *** leading term is soliton solutions,the second term is the interaction between solitons and dispersion,and the error term comes from a correspondingδ^(-)-*** with the asymptotic results on the classical NLS equation,the major difference is the second and third terms of the asymptotic expansion for the NNLS equation,which were affected by a function depending on the scattering data and the stationary phase point.

关键词： nonlocal nonlinear Schrödinger equation Riemann-Hilbert problem δ^(-)-steepest descent method soliton resolution

Iron scrap derived nano zero-valent iron/biochar activated persulfate for p-arsanilic acid decontamination with coexisting microplastics

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Journal of Environmental Sciences 2025年第5期151卷 733-746页

作者： Zihan Shu Hailan yang Shujing Ye Hong Li Zhiming yang Chuang Li Xiaofei Tan Shaobo Liu Hou Wang College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control(Hunan University)Ministry of EducationChangsha 410082China Shenzhen Research Institute of Hunan University Shenzhen 518055China School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China College of Resources and Environment University of Chinese Academy of SciencesBeijing 101408China School of Architecture and Art Central South UniversityChangsha 410083China School of Metallurgy and Environment Central South UniversityChangsha 410083China

P-arsanilic acid(AA)has received widespread attention because of its conversion to more toxic inorganic arsenic compounds(arsenate and arsenite)in the natural *** removal process and mechanisms with co-existence of microplastics remain *** this study,biochar loaded with nano zero-valent iron(nZVI)particles(ISBC)was prepared by using iron scrap obtained from a steel works and wood chips collected from a wood processing *** advanced oxidation system of sodium persulfate(PDS)activated by ISBC was applied for AA degradation and inorganic arsenic control in aqueous *** than 99%of the AA was completely degraded by the ISBC/PDS system,and the As(III)on AA was almost completely oxidized to As(V)and finally removed by ***_(3)−inhibited the removal of AA by the ISBC/PDS system,while Cl^(−)had a dual effect that showing inhibition at low concentrations yet promotion at high *** effect of microplastics on the degradation of AA by the ISBC/PDS system was further investigated due to the potential for combined microplastic and organic arsenic contamination in rural/remote *** were found to have little effect on AA degradation in the ISBC/PDS system,while affect the transport of inorganic arsenic generated from AA ***,this study provides new insights and methods for efficient removal of p-arsanilic acid from water with coexisting microplastics.

关键词： P-arsanilic acid Biochar Arsenate and arsenite Microplastics

Transforming waste particles into valuable adsorbents via amyloid-mediated molecular engineering

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Science China Chemistry 2025年第1期68卷 317-328页

作者： Qingmin yang Jian Zhao Yujia Zhang Xingyu Zhou Hao Ren Bowen Hu Zhongli Lei Lixin Chen Peng yang Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an 710119China School of Material and Chemical Engineering Bengbu UniversityBengbu 233030China Anhui Provincial Engineering Laboratory of Silicon-Based Materials Bengbu 233030China Xi’an Key Laboratory of Polymeric Soft Matter School of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an 710119China International Joint Research Center on Functional Fiber and Soft Smart Textile School of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an 710119China School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710129China

The high-value utilization of industrial solid waste using a facile and eco-friendly process is of great interest and significance in reducing environmental pollution and developing a green circular ***,we propose an amyloid-mediated molecular engineering strategy to transform particulate waste into valuable adsorbents for metal *** method has the advantage of aqueous solution fabrication under mild conditions without the use of high-temperature hydrothermal methods and toxic chemical ***-mediated molecular engineering manipulates the phase transition of bovine serum albumin(BSA)on particulate waste surfaces,resulting in a remarkable~3.1 times improvement in the adsorption capacity of fly ash,a typical industrial solid waste for gold ions after modification with the phase-transitioned BSA(PTB).The resultant adsorption ability was 69–1,980 times higher than those of conventional and emerging adsorbent materials such as ion exchange resins,activated carbon(AC),covalent organic frameworks(COFs),and metal-organic frameworks(MOFs).We further demonstrated the application of our PTB-modified materials in the recovery of precious metals from low-grade gold ore and electronic waste ***,this strategy could increase the value of waste materials nearly 27 *** addition,this method is generally extendable to other conventional industrial adsorbents such as resin,clay,and Al_(2)O_(3),and enhances their adsorption capabilities at least ***,this work provides a simple and green approach for improving the adsorption performance of solid particles,and is expected to develop into a universal strategy for transforming waste particles into high-value-added products.

关键词： amyloid-like protein aggregates surface engineering fly ash solid waste adsorption

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Synergistic promotion strategy of “dual-site” and “dual-path” to enhance the C–C coupling between CO_(2) and HCHO driven by photoelectrocatalysis

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Journal of Energy Chemistry 2025年第1期100卷 39-49页

作者： Hongqiang yang Jianfeng Zheng Guoyu Wang Yifei Gao Yatao yang Jia Li Xiaojin Han Yan Cui Zhanggen Huang National Key Laboratory of High Efficiency and Low Carbon Utilization of Coal Institute of Coal ChemistryChinese Academy of ScienceTaiyuan 030001ShanxiChina University of Chinese Academy of Science Beijing 100049China Shenyang University of Chemical Technology Shenyang 110142LiaoningChina

Photoelectrocatalytic coupling CO_(2)and volatile organic compounds (VOCs) is a promising green strategy for the synergistic conversion of the two carbon-containing resources to *** catalytic efficiency is always at the mercy of chemical inertness of CO_(2)and the competitive hydrogen evolution of ***,a modified g-C_(3)N_(4)/ZnAl-LDH Z-scheme heterojunction catalyst with dual reaction site was rationally designed and precisely *** Faraday efficiency of ethanol reached 68.67%with a corresponding formation rate of 227.3μmol g^(-1)h^(-1).As revealed by in-situ characterizations and density functional theory calculations,CO_(2)and HCHO were absorbed at Zn site and N site,***,*CO generated from CO_(2)and HCHO was converted to*CH_(3)O and*CHO on the dual-active-site *** detailed reaction mechanism experiments indicated that C–C coupling only occurred between*CO and*CH_(3)O in electrocatalysis *** from the“*CO+*CH_(3)O”path,another“*CO+*CHO”coupling path was also detected in photoelectrocatalytic *** selectivity of ethanol was significantly enhanced due to the synthesis of dual-site catalyst and the dual-path coupling path between CO_(2)and HCHO simultaneously driven by light and electricity.

关键词： g-C_(3)N_(4)/ZnAl-LDH heterojunction Z-scheme C-C coupling Ethanol

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Boundary fluid constraints during electrochemical jet machining of large size emerging titanium alloy aerospace parts in gas–liquid flows:Experimental and numerical simulation

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Chinese Journal of Aeronautics 2025年第1期38卷 115-130页

作者： yang LIU Ningsong QU Hansong LI Zhaoyang ZHANG School of Mechanical Engineering Jiangsu UniversityZhenjiang 212013China National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Large size titanium alloy parts are widely used in ***,they are difficult to manufacture using mechanical cutting technology because of severe tool *** jet machining is a promising technology to achieve high efficiency,because it has high machining flexibility and no machining tool ***,reports on the macro electrochemical jet machining of large size titanium alloy parts are very scarce,because it is difficult to achieve effective constraint of the flow field in macro electrochemical jet *** addition,titanium alloy is very sensitive to fluctuation of the flow field,and a turbulent flow field would lead to serious stray *** paper reports a series of investigations of the electrochemical jet machining of titanium alloy *** on the flow analysis and experiments,the machining flow field was effectively ***6 titanium alloy part with a perimeter of one meter was *** machined surface was smooth with no obvious machining *** machining process was particularly stable with no obvious spark *** research provides a reference for the application of electrochemical jet machining technology to achieve large allowance material removal in the machining of large titanium alloy parts.

关键词： Electrochemical jet machining Titanium alloys Large size parts Flow simulation Turbulent flow

Axial emission characteristics of an ionic liquid electrospray thruster with a circular emitter

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Chinese Journal of Aeronautics 2025年第1期38卷 297-305页

作者： Cheng yang Jiawei LUO Xiangbei WU Yan SHEN School of Aeronautics and Astronautics Sun Yat-sen UniversityShenzhen 518107China Shenzhen Key Laboratory of Intelligent Microsatellite Constellation Shenzhen 518107China

Ionic Liquid Electrospray Thrusters(ILETs)are well suited for micro-nano satellite applications due to their small size,low power consumption,and high specific ***,the limited thrust of a single-emitter ILET restricts its use in space *** optimize the performance of ILETs and make them suitable for a wider range of space missions,we designed a Circular-emitter ILET(CILET)to convert a one-dimensional(point)emission into a twodimensional(line)*** CILET can self-organize multiple Taylor cones *** cones were photographed and the axial emission currents were measured under different voltage and pressure difference conditions with a CILET experimental *** emission can be divided into two stable states and one unstable state based on the flow and current *** current in Stable state Ⅰ increases non-linearly with the voltage,while that in Stable state Ⅱ is nearly linear with respect to the *** number of cones increases with the voltage in stable states,while the cones become short and crowded under high-voltage *** variation law of the number of cones can be explained with the self-organization *** variation in the current exhibits a good correlation with the number of *** study demonstrates the feasibility of circular emitters and experimentally indicates that the emission current is improved by approximately two orders of magnitude compared to that of a single capillary.

关键词： Electrospray Ionic liquid thruster Self-organize Emitter Taylor cone

Mechanical properties and flow stress constitutive relationship of Ti–6Al–4V alloy with equiaxed microstructure at cryogenic temperatures

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Chinese Journal of Aeronautics 2025年第1期38卷 365-379页

作者： Jingwen HU Xun CHEN Yashun WANG Chen yang College of Intelligence Science and Technology National University of Defense TechnologyChangsha 410073China Laboratory of Science and Technology on Integrated Logistics Support National University of Defense TechnologyChangsha 410073China

This paper investigates the uniaxial tensile mechanical properties and flow behavior of Ti-6Al-4V alloys with equiaxed microstructure at cryogenic temperatures ranging from 77 K to298 K and strain rates from 10^(-4)/s to 10^(-2)/*** electron microscopy is utilized to analyze the fracture morphology,aiming to reveal the fracture behavior at various *** applicability of the Zener-Hollomon parameter and the Johnson-Cook model in describing the flow stress of Ti-6Al-4V at cryogenic temperatures is ***,a constitutive relationship modeling method based on the variational recurrent networks is *** test results show a significant increase in the strength of equiaxed Ti-6Al-4V alloy under cryogenic conditions while the plastic deformation process is ***,the fracture analysis indicates that even at 77 K,the fracture process is still dominated by ductile fracture,and brittle fracture does not occur within the range of 77 K to 298 *** fitting results validate the performance of the Zener-Hollomon parameter and the Johnson-Cook model in describing the deformation flow stress of Ti-6Al-4V alloy at cryogenic *** results also indicate that the proposed constitutive relationship modeling method based on the variational recurrent network performs better,making it a potential method for widespread applications.

关键词： Titanium alloys Mechanical properties Cryogenics Fracture testing Flow behavior

Increase in the variability of terrestrial carbon uptake in response to enhanced future ENSO modulation

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Atmospheric and Oceanic Science Letters 2025年第1期18卷 32-38页

作者： Younong Li Li Dan Jing Peng Qidong yang Fuqiang yang Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Key Laboratory of Atmospheric Environment and Processes in the Boundary Layer over the Low-Latitude Plateau Region Department of Atmospheric ScienceYunnan UniversityKunmingChina

El Niño-Southern Oscillation(ENSO)is a major driver of climate change in middle and low latitudes and thus strongly influences the terrestrial carbon cycle through land-air *** the ENSO modulation and carbon flux variability are projected to increase in the future,but their connection still needs further *** investigate the impact of future ENSO modulation on carbon flux variability,this study used 10 CMIP6 earth system models to analyze ENSO modulation and carbon flux variability in middle and low latitudes,and their relationship,under different scenarios simulated by CMIP6 *** results show a high consistency in the simulations,with both ENSO modulation and carbon flux variability showing an increasing trend in the *** higher the emissions scenario,especially SSP5-8.5 compared to SSP2-4.5,the greater the increase in *** flux variability in the middle and low latitudes under SSP2-4.5 increases by 30.9%compared to historical levels during 1951-2000,while under SSP5-8.5 it increases by 58.2%.Further analysis suggests that ENSO influences mid-and low-latitude carbon flux variability primarily through *** occurrence may potentially be attributed to the increased responsiveness of gross primary productivity towards regional temperature fluctuations,combined with the intensified influence of ENSO on land surface temperatures.

关键词： Carbon variability ENSO modulation CMIP6 models

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Magnaporthe oryzae infection triggers rice resistance to brown planthopper through the influence of jasmonic acid on the flavonoid biosynthesis pathway

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Insect Science 2025年第1期32卷 243-259页

作者： Su Chen Zhihuan Tao Yanjie Shen Rui yang Siyuan Yan Zixu Chen Bo Sun Xiaofang yang Precision Medicine Laboratory for Chronic Non-communicable Diseases of Shandong Province Institute of Precision MedicineJining Medical UniversityJiningShandong ProvinceChina Key Laboratory of Insect Developmental and Evolutionary Biology CAS Center for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and EcologyChinese Academy of SciencesShanghaiChina College of Medical Engineering&The Key Laboratory for Medical Functional Nanomaterials Jining Medical UniversityJiningShandong ProvinceChina Institute of Bioengineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhouChina

In agroecosystems,plants are constantly exposed to attack from diverse herbivorous insects and microbes,and infestation with one species may change the plant defense response to other *** our investigation of the relationships among rice plants,the brown planthopper Nilaparvata lugens(Stål)and the rice blast fungus Magnaporthe oryzae,we observed a significant increase in the resistance of rice treated with rice blast to ***,as evidenced by improved plant survival rates in a small population resistance *** transcriptome data analysis revealed that the rice blast fungus can induce the expression of genes in the jasmonic acid(JA)and flavonoid *** to the flavonoid pathway,the JA pathway also contains 2 types of genes that exhibit similar and opposite trends in response to *** and rice *** these genes,the osjaz1 mutant and the osmyc2 mutant were phenotypically confirmed to positively and negatively regulate rice resistance to *** and rice blast,*** mass spectrometry and quantification experiments showed that the exogenous application of methyl jasmonate(MeJA)can induce the accumulation of eriodictyol,naringenin and quercetin,as well as the expression of OsF3H,Os4CL5 and OsCHI in the flavonoid *** suggests a close connection between the JA pathway and the flavonoid ***,OsF3'H,which negatively regulates rice resistance to *** and rice blast,did not show increased *** and molecular experiments confirmed that OsMYC2 can bind to and inhibit the expression of OsF3'H,thus revealing the mechanism of rice resistance to *** after treatment with rice *** findings will deepen our understanding of the interactions among rice,*** and rice blast.

关键词： flavonoid jasmonic acid Nilaparvata lugens rice rice blast