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37,408篇文章
< 1 2 … 250 >
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：
Reduction and migration behavior of phosphorus in coal-based reduction of high-phosphorus oolitic iron ore 认领 引用
1
作者 Meng-Jie Hu De-Qing Zhu +4 位作者 Jian Pan Zheng-Qi Guo Cong-Cong Yang Si-Wei Li Wen Cao 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第3期88-105,共18页
Phosphorus tends to migrate into metallic iron during the direct reduction of high-phosphorus oolitic iron ore,leading to undesirable phosphorus enrichment in metallic iron.However,the underlying reduction and migrati... Phosphorus tends to migrate into metallic iron during the direct reduction of high-phosphorus oolitic iron ore,leading to undesirable phosphorus enrichment in metallic iron.However,the underlying reduction and migration mechanisms remain poorly understood.Phosphorus behavior during coal-based reduction was systematically investigated through theoretical modeling and experimental approaches.Thermodynamic analysis revealed that the carbon reduction of solid Ca3(PO4)2to gaseous P2requires temperatures exceeding 1400℃.Notably,this threshold significantly decreases to 1130.5℃in the presence of SiO2and Al2O3.Further investigations demonstrated that Ca3(PO4)2co-reduces with FexOγin the presence of SiO2-Al2O3-FexOγ,forming Fe3P(instead of gaseous P2)at a markedly lower temperature of 778.7℃.Mechanistic studies indicate that the inherent thermal stability of Ca3(PO4)2inhibits the generation of reactive[P2O5].However,SiO2-Al2O3coexistence destabilizes Ca3(PO4)2while exponentially enhancing[P2O5]activity.This synergistic effect dramatically promotes the phosphorus mineral reduction.Characterization confirmed that Ca3(PO4)2migrated into the slag phase(4FeO·Al2O3·3SiO2·CaO·P2O5).Subsequently,the reactive P2O5in slag is reduced with metallic iron to form Fe3P,which further dissolves into theα-Fe matrix through solid-state diffusion,ultimately generating Fe-P solid solutions. 展开更多
关键词 Oolitic hematite ore Coal-based reduction Migration behavior Dephosphorization
暂未订购 下载PDF
Migration behavior of magnetic nanoparticles with chain-like structure under gradient magnetic field and its influence on magnetic hyperthermia 认领 引用
2
作者 Yundong Tang Xiaoyi Yang +1 位作者 Rodolfo C.C.Flesch Tao Jin 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期653-661,共9页
Magnetic hyperthermia uses magnetic nanoparticles(MNPs)to generate the heat used for damaging cancer cells under an alternating magnetic field.In fact,the MNPs tend to gather at the injection center and also occur the... Magnetic hyperthermia uses magnetic nanoparticles(MNPs)to generate the heat used for damaging cancer cells under an alternating magnetic field.In fact,the MNPs tend to gather at the injection center and also occur the clustering phenomenon at the same time when injecting into tumor tissue,which however can ultimately result in the excessive concentration of heat in the injection site.Thus,this study aims at improving the MNPs concentration distribution after the injection behavior by considering the action of a static gradient magnetic field,and finally optimizes both temperature situation and thermal damage degree for tumor tissue during magnetic hyperthermia.The MNPs distribution inside a proposed liver tumor is simulated by adopting a Monte Carlo method with adaptive step size,which consists of enough number of small size particles used to analyze the behavior of migration,diffusion,and chain-like phenomenon.The research results demonstrate that the introduction of static gradient magnetic field can disperse the MNPs and form a chainlike distribution inside tumor,and can then expand the distribution range of MNPs,thereby optimizing the thermal damage degree of tumor tissue.In addition,a PID controller with proper setting coefficients is also proven to be able to improve the therapeutic effect for hyperthermia by shortening the rising time to the critical temperature when proper coefficients are set properly during therapy. 展开更多
关键词 magnetic hyperthermia magnetic nanoparticles particles migration gradient magnetic field
暂未订购 下载PDF
Suppressing planar gliding and cation migration in O3-type layered oxide cathode for long-life and wide-temperature sodium-ion batteries 认领 引用
3
作者 Peng Yu Nini Liu +10 位作者 Yizhong Gou Daomin Qin Wen Zhang Lihua Feng Yameng Fan Yu Wang Changhong Wang Jiantao Han Yunhui Huang Jian Peng Chun Fang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第2期789-799,I0017,共11页
Sodium layered oxides stand out as one of the most promising cathodes for sodium-ion batteries due to their high energy density,elemental abundance,and scalability.However,their practical applications are restricted b... Sodium layered oxides stand out as one of the most promising cathodes for sodium-ion batteries due to their high energy density,elemental abundance,and scalability.However,their practical applications are restricted by interplanar gliding,cation migration,and the formation of intragranular microcracks,which collectively lead to rapid structural degradation and capacity loss.Herein,we rationally design an ultrastable O3-type Na0.94Ca0.03Ni1/3Fe1/3Mn1/3O2 cathode,in which Ca2+cations act as pillars within the NaO2slabs,suppressing the irreversible phase transitions and Na/TM cation migration commonly observed in layered oxides.Multiscale in situ and ex situ techniques,combined with post-mortem analysis,reveal that the Ca-pillared pinning effect not only effectively suppresses the interplanar gliding and stress accumulation within the crystal phase but also restrains Na/TM cation migration and surface reconstruction in near-surface regions.Benefiting from the combined effects of structural stabilization,the Ca-pillared cathode exhibits a superior cycling stability,retaining 81.6%of its capacity after 1000 cycles at 2 C within the voltage range of 2.0-4.0 V,along with significantly enhanced wide-temperature(from-40 to 80℃)performance.This work highlights another critical role of Ca pillars in suppressing cation migration and surface structural degradation beyond preventing adverse interplanar gliding,offering valuable insights for designing long-life and wide-temperature layered oxide cathodes. 展开更多
关键词 Layered oxide cathodes Pinning effect Planar gliding Cation migration Sodium-ion batteries
暂未订购 下载PDF
Quantitative regulation of DOM on ferrihydrite colloids migration in saturated kaolinite and MgAl-LDH-coated sand columns 认领 引用
4
作者 Lijuan Zeng Guining Lu +6 位作者 Feng Jiang Ying-Jie Zhang Xiaohu Jin Yajing Huang Xiaoyao Wang Xiaoyun Yi Zhi Dang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第3期600-611,共12页
The adsorption of ferrihydrite colloids(Fh-NPs)on solid-phase media is the main factor determining their migration.However,most studies on colloids migration only provide qualitative descriptions.This study explored t... The adsorption of ferrihydrite colloids(Fh-NPs)on solid-phase media is the main factor determining their migration.However,most studies on colloids migration only provide qualitative descriptions.This study explored the impact and mechanisms of humic acids(HAs)and fulvic acids(FAs)on Fh-NPs migration in different saturated media via quantitative adsorption analysis.The coexistence of high HAs/FAs concentration promoted the migration of Fh-NPs in the negatively charged kaolinite-coated sand columns,but hindered migration in the positively charged MgAl-layered double hydroxides(LDH)-coated sand columns.The high HAs/FAs concentration combined with Fh-NPs reversed the surface positive charge of Fh-NPs,reducing adsorption capacity of kaolinite for Fh-NPs to 1.93/3.93 mg/g(from 20.8 mg/g without HAs/FAs)and increasing that of LDH for Fh-NPs to 31.1/30.6 mg/g(from nearly 0 mg/g without HAs/FAs).HAs/FAs could also combine with LDH to form a composite solid phase,thereby increasing the adsorption capacity of the solid phase for Fh-NPs.Furthermore,the influence of HAs on the Fh-NPs migration behavior was more significant than that of FAs due to the stronger binding interaction between HAs and Fh-NPs.Fluorescence spectroscopy combined with two-dimensional correlation spectroscopy revealed that Fh-NPs that preferentially combined with HAs/FAs caused a decrease in the ability of HAs/FAs to complex with kaolinite and LDH.The results of the present study provided a deep understanding of the migration mechanism of Fh-NPs and HAs/FAs in the soil environment,and provided scientific basis for predicting the geochemical behavior of pollutants or carbon in the soil environment. 展开更多
关键词 Ferrihydrite colloids Dissolved organic matter(DOM) Solid phases Migration Quantitative analysis
暂未订购 下载PDF
Electrostatic interaction tuned proton migration behavior by electron-rich Pt sites enhancing alkaline hydrogen evolution reaction 认领 引用
5
作者 Shuping Zhang Li Zhao +5 位作者 Wenjing Yuan Pin Zhou Zhiyi Sun Qing Cao Riming Hu Jiayuan Yu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第3期791-798,共8页
Regulating the critical process of proton migration from water dissociation for boosting alkaline hydrogen evolution reaction(HER)remains a challenge.Herein,we propose an electrostatic attraction strategy to achieve t... Regulating the critical process of proton migration from water dissociation for boosting alkaline hydrogen evolution reaction(HER)remains a challenge.Herein,we propose an electrostatic attraction strategy to achieve the migration of a highly efficient hydrogen species to Pt sites over Pt/Co@NC,which is obtained through a facile calcination and electrodeposition method.It exhibits an outstanding geometric activity(η10=31 m V),which surpasses the commercial 20 wt%Pt/C(η10=37 mV).Moreover,the mass activity of Pt/Co@NC is 5.6 A mgPt-1 at-50 mV vs.RHE,which is 2.23 times higher than that of 20 wt%Pt/C.Experimental and theoretical results indicate that the work function of the outer carbon layer,which is changed by the introduction of the inner cobalt core,plays a crucial role in reversing the direction of electron migration between the carbon layer and Pt.The negatively charged Ptδ-can spontaneously attract positively charged protons via the electrostatic interaction effect,thereby achieving the directional migration of hydrogen species.This work presents a strategy for designing advanced alkaline HER electrocatalysts by the electrostatic effect. 展开更多
关键词 Pt-based catalysts Electronic structure Proton migration Alkaline hydrogen evolution reaction Water dissociation
暂未订购 下载PDF
Liquid mulching film mitigates cationic heavy metals migration via enhancing soil organic matter and cation exchange capacity 认领 引用
6
作者 Lijuan Cha Zhiyun Zhang +7 位作者 Ruiyao Shi Fangfang Li Gang Chu Lincai Peng Jing Zhao Jing Li Minghao Cheng Min Wu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第5期292-300,共9页
Liquid biodegradable mulching film(LBMFs)technology,an innovative agricultural technology,shows dual potential in plastic pollution reduction and heavy metal contamination control.Although their agronomic benefits are... Liquid biodegradable mulching film(LBMFs)technology,an innovative agricultural technology,shows dual potential in plastic pollution reduction and heavy metal contamination control.Although their agronomic benefits are recognized,the underlying mechanisms of LBMFs in regulating heavy metal biogeochemical cycles remain inadequately understood.This study demonstrates the effectiveness of lignin-based(JH)and chitosan-based(LB)LBMFs in modifying heavy metal speciation and minimizing their uptake by crops.The results indicated that JH and LB significantly enhanced soil organic matter(SOM)by 14.29%-27.01%and cation exchange capacity(CEC)by 20.65%-247.17%,compared to soil blank control,primarily due to the enrichment of colloids derived from lignin/chitosan and the stimulation of microbial activity.Both films reduced the bioavailability of Cd and Pb by promoting their transition from mobile acid solubleeducible(F1/F2)fractions to stable oxidizableesidual(F3/F4)fractions.In contrast,Cu and Zn speciation remained stable due to strong mineral interactions.The LBMFs also inhibited the transfer of heavy metals to edible crops.Crop-specific translocation factor(TF)variations were observed,with JH reducing pak choi TF by 32.62%-76.09%but increasing radish TF by 33.47%-437.55%,linked to lignin’s root chelation and chitosan’s phloem transport dynamics.Additionally,Mantel analysis confirmed bioconcentration factor(BCF)/TF reductions correlated strongly with elevated SOM(r=0.82/0.73)and CEC(r=0.80/0.77),governed by organo-mineral complexation and competitive cation displacement.This work positions LBMFs as valuable tools for enhancing soil health and reducing dietary risks associated with heavy metals in contaminated agricultural lands. 展开更多
关键词 Liquid mulching film Migration activity Soil organic matter Cation exchange capacity
暂未订购 下载PDF
P-and S-Wave Poynting Vectors Derived from the Divergence and Curl Mode Separation for Elastic Wave Reverse Time Migration 认领 引用
7
作者 Nan Hu Min-gui Cai +4 位作者 Yang-guang Yin Yun-sheng Zhao Hao Li Jun-wu Li Bing-feng Zhou 《Applied Geophysics》 SCIE CSCD 2026年第1期56-70,427,共15页
Reverse Time Migration(RTM)stands as one of the foremost advanced seismic wave imaging techniques.For elastic wave RTM,the separation of P-and S-waves prior to imaging is crucial to eectively prevent cross-talk interf... Reverse Time Migration(RTM)stands as one of the foremost advanced seismic wave imaging techniques.For elastic wave RTM,the separation of P-and S-waves prior to imaging is crucial to eectively prevent cross-talk interference between these wave modes.While more sophisticated P-and S-wave separation methods based on decoupled wave equations currently exist,the approach utilizing divergence and curl operators retains signicant practical value in elastic RTM due to its inherent simplicity in implementation and lower computational demand.However,existing P-and S-wave separation methods founded on divergence and curl operators lack a corresponding methodology for calculating decoupled P-and S-wave Poynting vectors.These decoupled Poynting vectors are vital as they can respectively indicate the propagation directions of P-and S-waves,and their application within elastic RTM can markedly improve imaging quality.This paper derives new formulas for calculating P-and S-wave Poynting vectors that correspond to the wave separation achieved through divergence and curl operators.This approach permits the accurate determination of P-and S-wave propagation directions without altering the original wave equations and has been applied to elastic RTM,ensuring higher computational efciency throughout the imaging process.Imaging test results from both the Graben and Marmousi models demonstrate that,compared to traditional coupled Poynting vectors,the decoupled P-and S-wave Poynting vectors proposed herein achieve superior suppression of migration noise and artifacts in elastic RTM.Furthermore,they facilitate accurate S-wave polarity correction,leading to clearer imaging interfaces in migration proles and more reliable overall results.The methodology presented in this paper broadens the application scenarios for elastic RTM under current computational resource constraints and is poised to stimulate further development of P-and S-wave separation methods based on divergence and curl operators within the eld of RTM. 展开更多
关键词 Reverse Time Migration Poynting Vectors Wavefield Decoupling Noise Suppression Polarity Correction
暂未订购 下载PDF
Effect of particle size on migration and retention of bacteria in sand and its biomineralization 认领 引用
8
作者 Hanjiang Lai Shuiquan Deng +5 位作者 Mingjuan Cui Shaohui Zheng Junjie Zheng Runming Liu Jianwei Zhang Yu Song 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期1496-1503,共8页
Bacterial cells are widely accepted as nucleation sites for calcium carbonate precipitation in biomineralization based on the Microbially Induced Carbonate Precipitation(MICP)process.For MICP-based insitu biotreatment... Bacterial cells are widely accepted as nucleation sites for calcium carbonate precipitation in biomineralization based on the Microbially Induced Carbonate Precipitation(MICP)process.For MICP-based insitu biotreatment,the firstproblem to be solved is how to introduce and retain the bacterial cells in the soil,which involves the migration and retention of bacterial cells during the biogrouting process.Soil particle size,a key factor in determining pore throat size,can have a significanteffect on the migration and retention of bacterial cells in the soil and therefore on biomineralization.To investigate the effect of particle size on the migration and retention of bacterial cells in sand and its biomineralization,two sets of tests were carried out in this study,including percolation tests and sand column treatment tests.Soil urease activity(definedas urease activity per unit mass of soil)and calcium carbonate content of the biomineralized sand were measured to comprehensively assess the migration and retention of bacterial cells in the sand.The results indicate that sands with a particle size smaller than 0.25 mmwould inhibit the migration of bacteria in the sand,resulting in a nonuniform distribution of precipitated calcium carbonate and a low strength enhancement of biomineralization.On the other hand,sands with a particle size larger than 1.18 mm are unfavorable for retaining bacterial cells in the sand,resulting in low calcium conversion efficiency.Meanwhile,particle size would also affect the formation of effective calcium carbonate through interparticle contact number and interparticle pore size,and thus biomineralization. 展开更多
关键词 Microbially induced carbonate precipitation(MICP) Soil particle size Bacterial cell Migration Retention Biomineralization
暂未订购 下载PDF
Hydraulic Fracture Conductivity Loss Mechanisms for Unconsolidated Sands Considering Fine Migrations and Proppant Embedments 认领 引用
9
作者 Xian Shi Botao Zhang +5 位作者 Weidong Zhang Zenghua Ma Bo Zhang Ahmad Ramezanzadeh Bin Li Jian Mao 《Energy Engineering》 EI 2026年第5期416-433,共18页
To investigate the mechanism governing the continuous decline in fracture conductivity of unconsolidated sandstone reservoirs post-hydraulic fracturing,this study centers on the synergistic effects of two key mechani... To investigate the mechanism governing the continuous decline in fracture conductivity of unconsolidated sandstone reservoirs post-hydraulic fracturing,this study centers on the synergistic effects of two key mechanisms—particle migration and proppant embedment.Through the integration of laboratory experiments and computational fluid dynamics-discrete element method(CFD-DEM)coupled numerical simulations,this study systematically examines the influence patterns of varying closure pressures,particle concentrations,fluid properties,and proppant parameters on fracture conductivity.The experimental results demonstrate that particle migration induces pore blockage within the proppant packing layer.When the fines mass concentration reaches 10%,fracture conductivity is almost entirely lost.Furthermore,the embedment depth of proppants increases with increasing closure pressure,and the embedment depth of proppants with a high elastic modulus is twice that of those with a low elastic modulus under a closure pressure of 35 MPa.Numerical simulations further reveal that fluid viscosity and displacement rate significantly govern the migration range and blockage pattern of particles.When the fluid viscosity is 10 mPa·s and the displacement rate is 200 mL/min,a balance between fracturing construction efficiency and fracture damage can be attained.The coupled model developed in this study accurately predicts the attenuation law of fracture conductivity under the synergistic effect of these two mechanisms.This model addresses the gap in understanding the coupled effects of mechanisms in unconsolidated sandstone reservoirs in existing literature and provides a theoretical foundation and engineering guidance for parameter optimization in the fracturing design of such reservoirs. 展开更多
关键词 Fine migration proppant embedment fracture conductivity loss unconsolidated sandstone reservoir
暂未订购 下载PDF
Optimization strategy for iron ore pellet properties via silicate liquid phase coupled with MgO:regulation of alkali metal migration behavior 认领 引用
10
作者 Ke Ma Jing Yi +2 位作者 Zi-Jian Su Tao Jiang Yuan-Bo Zhang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第5期50-68,共19页
The performance of iron ore pellets was influenced by gangue mineral interactions and alkali metal migration during the oxidation and reduction processes.A novel synergistic strategy was proposed to optimize pellet pr... The performance of iron ore pellets was influenced by gangue mineral interactions and alkali metal migration during the oxidation and reduction processes.A novel synergistic strategy was proposed to optimize pellet properties by regulating the liquid phase content coupled with MgO addition.The effects of SiO2and MgO contents on liquid phase generation,pellet microstructure,compressive strength,reduction swelling index(RSI),and reduction index(RI)were systematically investigated.The results showed that the increasing SiO2content significantly enhanced liquid phase formation,thereby improving compressive strength and reducing RSI,but lowering RI.MgO promoted the formation of MgxFe3-xO4during oxidation,increasing porosity and enhancing RI while slightly compromising mechanical strength.In addition,MgxFe3-xO4reduced the expansion during the initial reduction stage(Fe2O3→Fe3O4).Optimal performance was achieved when the liquid phase content in the roasted pellet was maintained at 11%-13%and MgO at 2.0%-2.6%,with compressive strength exceeding 2500 N,RSI below 20%,and RI above 64%.In addition,doubling the liquid phase content reduced the concentration of alkali metals diffused into the iron oxide lattice by approximately 50%,mitigating the localized precipitation of metallic iron whiskers during the final reduction stage(FexO→Fe).Alkali metal doped into iron oxides during oxidation had a more pronounced effect on swelling behavior than the reduction process.These findings offered practical insights into high-performance pellet production under industrial conditions. 展开更多
关键词 Iron ore pellet Liquid phase MgO Alkali metal migration Metal iron growth
暂未订购 下载PDF
QIMIG:A Quantum-Inspired Evolutionary Framework for Software Library Migration 认领 引用
11
作者 Yun Liu Jinghua Zhao +3 位作者 Liang Ma Zijie Huang Lizhi Cai Jianxin Ge 《Computers, Materials & Continua》 SCIE EI 2026年第9期795-812,共18页
Automated library migration reduces refactoring costs but challenges traditional evolutionary algorithms,which often suffer from premature convergence and poor recall in sparse,complex API mapping spaces.To address th... Automated library migration reduces refactoring costs but challenges traditional evolutionary algorithms,which often suffer from premature convergence and poor recall in sparse,complex API mapping spaces.To address this,we propose QIMIG,a multi-objective optimization framework integrating quantum-inspired encoding with quality-aware and greedy heuristic filtering.QIMIG utilizes a probabilistic Q-bit representation to maintain population diversity and avoid local optima.Simultaneously,its heuristic components leverage historical usage context to filter semantic noise and guide the search toward valid mappings.Evaluated on 9 real-world migration rules derived from 57,447 open-source projects,QIMIG statistically significantly outperforms state-of-the-art baselines such as UNSGA-III.The framework achieves a global mean F1-score of 0.92,exceeding the best-performing baseline by an absolute margin of 0.05,and demonstrates strong stability in resolving complex mapping structures. 展开更多
关键词 Library migration API mapping search-based software engineering quantum-inspired evolutionary algorithm multi-objective optimization
暂未订购 下载PDF
Millimeter wave imaging of Range Migration Algorithm with adaptive background filtering 认领 引用
12
作者 CHENG Zhi-Hua ZHOU Ran +3 位作者 WANG Meng YU Tao WANG Yu-Lan YAO Jian-Quan 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2026年第2期279-284,共6页
This paper proposes a novel Range Migration Algorithm(RMA)integrated with an adaptive background filtering method specifically designed for near-field millimeter-wave imaging scenarios where targets are in close proxi... This paper proposes a novel Range Migration Algorithm(RMA)integrated with an adaptive background filtering method specifically designed for near-field millimeter-wave imaging scenarios where targets are in close proximity to background structures.This method simulates the attention distribution mode of the human visual system which is used in Artificial Intelligence(AI)and called the Attention Mechanism.Based on the concept of static clutter filtering,the frequency-domain signals of the scanning aperture are divided into grid cells.Background scattering functions are established by analyzing the motion processes within each cell,and the background interference is linearly filtered out.An analysis of the manifestation of background scattering interference within the algorithm is carried out,and the impact of the grid cell dimension on the imaging quality is investigated.Experimental results show that the proposed method exhibits the capability to enhance the signal-to-noise ratio of both the target and the background.It effectively suppresses the background interference,leading to a more prominent image,meanwhile without imposing the excessive computational load.The method offers a novel solution for improving the performance of millimeter-wave imaging technology in practical applications. 展开更多
关键词 information processing technology millimeter-wave imaging Range Migration Algorithm(RMA) attention mechanism adaptive background filtering
暂未订购 下载PDF
Redundant source-wavelet amplitude influence in wave-equation migration/demigration flow and its removal 认领 引用
13
作者 QianCheng Liu JiaLe Kang Jie Li 《Earth and Planetary Physics》 EI CSCD 2026年第1期75-81,共7页
In wave-equation migration and demigration,the cross-correlation imaging/forwarding step implicitly injects an additional copy of the source wavelet,so that the amplitude spectrum of the wavelet is applied redundantly... In wave-equation migration and demigration,the cross-correlation imaging/forwarding step implicitly injects an additional copy of the source wavelet,so that the amplitude spectrum of the wavelet is applied redundantly(effectively imposing a wavelet-spectrum weighting,often akin to an amplitude-squared bias).This redundancy degrades structural fidelity and amplitude balance yet is frequently overlooked.We(i)formalize the mechanism by which cross-correlation duplicates the source-wavelet amplitude effect in both migration and demigration,and(ii)introduce a source-equalized operator that removes the redundancy by deconvolving(or dividing by)the wavelet amplitude spectrum in the imaging condition and its demigration counterpart,while leaving phase/kinematics intact.Using a band-limited Ricker wavelet on a two-layer model and on Marmousi,we show that,if unmanaged,the redundant wavelet spectrum broadens main lobes,introduces ringing,and suppresses vertical resolution in migrated images,and inflates spectrum mismatches between demigrated and observed data even when peak times agree.With our correction,images recover observed-data-consistent bandwidth and sharpened interfaces,and demigrated data also exhibit improved spectrum conformity and reduced amplitude misfit.The results clarify when source amplitudes matter,why cross-correlation makes them redundantly matter,and how a lightweight spectral correction restores physically meaningful amplitude behavior in wave-equation migration/demigration. 展开更多
关键词 wave-equation migration demigration cross-correlation imaging condition source wavelet amplitude spectrum spectral deconvolution
暂未订购 下载PDF
Waveform-matching reverse time migration for local earthquakes 认领 引用
14
作者 Lanshu Bai Qingju Wu Ruiqing Zhang 《Earthquake Science》 CAS CSCD 2026年第2期125-139,共15页
With the increasing use of passive seismic data,developing seismic reflection imaging methods based on passive data is of considerable practical significance.This study presents a waveform-matching reverse time migrat... With the increasing use of passive seismic data,developing seismic reflection imaging methods based on passive data is of considerable practical significance.This study presents a waveform-matching reverse time migration for the primary reflected data from local earthquakes.In order to mitigate inconsistencies in frequency band and energy across earthquakes of different magnitudes,we first establish reference seismic waveform with standardized dominant frequency and magnitude.A matching operator is derived for each event by matching its waveforms with the reference waveform.This operator is then applied via convolution to all waveforms,producing standardized seismic waveforms with consistent wavelet features.The reshaped waveforms are then subjected to reverse time migration using an impedance imaging condition for primary reflections.To suppress strong energy interference near the hypocenters,both illumination compensation and three-dimensional Smoothed Spherical Mask centered on each source are used.Numerical tests using both simple two-layer model and fault-containing model demonstrate that the new method is robust and effective.The reverse time migration of primary reflected data of local earthquakes accurately images underground impedance boundaries such as stratum interfaces and fault planes,showing its promise for future application in seismically active fault zones. 展开更多
关键词 passive seismic data local earthquake waveform matching reverse time migration primary reflected data
暂未订购 下载PDF
Several Properties of Branching Processes with Migration and Affected by Viral Infectivity in Random Environments 认领 引用
15
作者 REN Min ZHANG Guanghui 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2026年第3期291-298,共8页
In this paper,a model of branching processes with migration and affected by viral infectivity in independent and identically distributed(i.i.d.)random environments is established firstly.Then the Markov property,condi... In this paper,a model of branching processes with migration and affected by viral infectivity in independent and identically distributed(i.i.d.)random environments is established firstly.Then the Markov property,conditional probability generating function and conditional expectation of the model are studied.Finally,under certain conditions,some sufficient conditions for certain extinction of processes are given,and some related theories of branching processes in random environments are generalized. 展开更多
关键词 random environments viral infectivity migration branching processes conditional probability generating function extinction probability
暂未订购 下载PDF
Global patterns of diel vertical migration:a comparative synthesis using sound scattering layer observations 认领 引用
16
作者 Minghua Xue Jianfeng Tong 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2026年第1期1-17,共17页
The sound scattering layer(SSL)is a widespread acoustic characteristic in the global ocean,primarily formed by densely distributed zooplankton and small pelagic fish.As an important component of the marine ecosystem,t... The sound scattering layer(SSL)is a widespread acoustic characteristic in the global ocean,primarily formed by densely distributed zooplankton and small pelagic fish.As an important component of the marine ecosystem,the SSL plays a crucial role in vertical energy transfer,carbon flux,and food web interactions.Diel vertical migration(DVM)is the primary behavioral characteristic of the SSL,driven by a combination of environmental and biological factors,including illumination,water temperature,dissolved oxygen concentrations,food availability,and predation pressure.However,due to limitations in long-term observation capacity,the accumulation of acoustic data,and differences in regional research priorities,the depth of understanding of SSLs varies among different marine regions.This review systematically examines the composition,classification,and DVM characteristics of SSLs,with a particular focus on their research status in the Pacific Ocean,the Atlantic Ocean,the Indian Ocean,the polar seas,and the coastal ocean of China.The knowledge of survey status,biological composition,distribution patterns,and DVM behaviors in these regions provides a scientific foundation for advancing the understanding of SSL dynamics.It also supports the sustainable development and management of fishery resources under climate and marine environmental change. 展开更多
关键词 sound scattering layer deep scattering layer diel vertical migration fishery acoustic marine ecosystem zooplankton
暂未订购 下载PDF
Unraveling the roles of estrogen receptor alpha and retinoic acid receptor alpha signaling in perfluorinated iodine alkane-mediated migration of breast cancer cells 认领 引用
17
作者 Jiahui Su Xiaoxi Yang +4 位作者 Qian S.Liu Hanqing Xu Yurou Gao Qunfang Zhou Guibin Jiang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第5期890-900,共11页
Investigating the roles of diverse nuclear receptors in the toxicological effects induced by perfluorinated iodine alkanes(PFIs)is critical,given their(ant)agonistic activities on estrogen receptors(ERs)and retinoic a... Investigating the roles of diverse nuclear receptors in the toxicological effects induced by perfluorinated iodine alkanes(PFIs)is critical,given their(ant)agonistic activities on estrogen receptors(ERs)and retinoic acid receptor alpha(RARα).In this study,two PFIs,namely tridecafluorohexyl iodide(PFHxI)and dodecafluoro-1,6-diiodohexane(PFHxDI),were evaluated for their impacts on the malignancy of breast cancer cells.The in vitro and in silico results revealed PFIs induced ERαagonism and RARα antagonism.Both PFIs remarkably promoted the migration,invasion,and proliferation of MCF-7 cells,while they had negligible effects on MDA-MB-231 cells.The pro-migratory effects of PFIs on MCF-7 cells were abolished by an ERαantagonist of 4-hydroxytamoxifen,indicating the substantial role of ERα signaling in cancer cell progression.The RAR agonist,all-trans retinoic acid(atRA),remarkably inhibited the migration of MCF-7 and RARα-overexpressed MDA-MB-231(namely,MDA-RARα)cells,indicating RARα agonism lowered the malignancy of tumor cells.Although PFI-induced RARα antagonism alone had no effects on the migration of MDA-RARαcells,it did recover that compromised by atRA.This study provides new evidence on the promotion effects of PFIs on breast cancer cells,and reveals the multi-nuclear receptor-regulated mechanisms for understanding intricate toxicological effects of emerging pollutants. 展开更多
关键词 Perfluorinated iodine alkanes(PFIs) Breast cancer cells Cell migration Estrogen receptor alpha(ERα) Retinoic acid receptor alpha(RARα)
暂未订购 下载PDF
Small extracellular vesicles derived from hair follicle neural crest stem cells enhance perineurial cell proliferation and migration via the TGF-β/SMAD/HAS2 pathway 认领 引用
18
作者 Yiming Huo Bing Xiao +8 位作者 Haojie Yu Yang Xu Jiachen Zheng Chao Huang Ling Wang Haiyan Lin Jiajun Xu Pengfei Yang Fang Liu 《Neural Regeneration Research》 SCIE CAS CSCD 2026年第5期2060-2072,共13页
Peripheral nerve defect repair is a complex process that involves multiple cell types;perineurial cells play a pivotal role.Hair follicle neural crest stem cells promote perineurial cell proliferation and migration vi... Peripheral nerve defect repair is a complex process that involves multiple cell types;perineurial cells play a pivotal role.Hair follicle neural crest stem cells promote perineurial cell proliferation and migration via paracrine signaling;however,their clinical applications are limited by potential risks such as tumorigenesis and xenogeneic immune rejection,which are similar to the risks associated with other stem cell transplantations.The present study therefore focuses on small extracellular vesicles derived from hair follicle neural crest stem cells,which preserve the bioactive properties of the parent cells while avoiding the transplantation-associated risks.In vitro,small extracellular vesicles derived from hair follicle neural crest stem cells significantly enhanced the proliferation,migration,tube formation,and barrier function of perineurial cells,and subsequently upregulated the expression of tight junction proteins.Furthermore,in a rat model of sciatic nerve defects bridged with silicon tubes,treatment with small extracellular vesicles derived from hair follicle neural crest stem cells resulted in higher tight junction protein expression in perineurial cells,thus facilitating neural tissue regeneration.At 10 weeks post-surgery,rats treated with small extracellular vesicles derived from hair follicle neural crest stem cells exhibited improved nerve function recovery and reduced muscle atrophy.Transcriptomic and micro RNA analyses revealed that small extracellular vesicles derived from hair follicle neural crest stem cells deliver mi R-21-5p,which inhibits mothers against decapentaplegic homolog 7 expression,thereby activating the transforming growth factor-β/mothers against decapentaplegic homolog signaling pathway and upregulating hyaluronan synthase 2 expression,and further enhancing tight junction protein expression.Together,our findings indicate that small extracellular vesicles derived from hair follicle neural crest stem cells promote the proliferation,migration,and tight junction protein formation of perineurial cells.These results provide new insights into peripheral nerve regeneration from the perspective of perineurial cells,and present a novel approach for the clinical treatment of peripheral nerve defects. 展开更多
关键词 hair follicle neural crest stem cells HAS2 migration miR-21-5p perineurial cells proliferation peripheral nerve injury Smad7 small extracellular vesicles transforming growth factor-β/SMAD signaling pathway
暂未订购 下载PDF
Migration laws of petroleum in silty clay under freeze-thaw action 认领 引用 被引量：1
19
作者 Ming Lu Hu Zhang +4 位作者 AnYuan Li Yang Hu Shan Zhen Li HuiJun Jin Bo Zheng 《Research in Cold and Arid Regions》 CAS CSCD 2026年第1期1-10,共10页
Petroleum extraction and transportation in cold regions often result in leakage accidents,which can cause severe environmental pollution.The prevalent freeze-thaw cycles in these areas significantly influence the migr... Petroleum extraction and transportation in cold regions often result in leakage accidents,which can cause severe environmental pollution.The prevalent freeze-thaw cycles in these areas significantly influence the migration and dispersion of petroleum.Therefore,understanding these processes is essential for effective environmental protection.The experimental results indicate that capillary action,liquid pressure,and particle adsorption primarily influence petroleum migration in the unfrozen zone.Under freeze-thaw cycles,proper temperature gradients facilitate petroleum migration from unfrozen to frozen zone,while extreme temperature gradients impede this migration.The migration processes of water and petroleum are interdependent and mutually restrictive.An increase in initial moisture content promotes petroleum migration.However,when the moisture content exceeds a certain threshold,a significant amount of pore water(or ice)occupies the pore space,which hinders petroleum migration.Additionally,as the number of freeze-thaw cycles increases,the capability of petroleum to migrate into the frozen zone significantly improves.These findings provide experimental methods and scientific evidence for further exploration of petroleum migration mechanisms in cold regions and the development of effective soil contamination remediation strategies. 展开更多
关键词 Permafrost Petroleum-contaminated soil Freeze-thaw cycles Petroleum migration
暂未订购 下载PDF
Cell type-dependent role of transforming growth factor-βsignaling on postnatal neural stem cell proliferation and migration 认领 引用 被引量：1
20
作者 Kierra Ware Joshua Peter +1 位作者 Lucas McClain Yu Luo 《Neural Regeneration Research》 SCIE CAS CSCD 2026年第3期1151-1161,共11页
Adult neurogenesis continuously produces new neurons critical for cognitive plasticity in adult rodents.While it is known transforming growth factor-βsignaling is important in embryonic neurogenesis,its role in postn... Adult neurogenesis continuously produces new neurons critical for cognitive plasticity in adult rodents.While it is known transforming growth factor-βsignaling is important in embryonic neurogenesis,its role in postnatal neurogenesis remains unclear.In this study,to define the precise role of transforming growth factor-βsignaling in postnatal neurogenesis at distinct stages of the neurogenic cascade both in vitro and in vivo,we developed two novel inducible and cell type-specific mouse models to specifically silence transforming growth factor-βsignaling in neural stem cells in(mGFAPcre-ALK5fl/fl-Ai9)or immature neuroblasts in(DCXcreERT2-ALK5fl/fl-Ai9).Our data showed that exogenous transforming growth factor-βtreatment led to inhibition of the proliferation of primary neural stem cells while stimulating their migration.These effects were abolished in activin-like kinase 5(ALK5)knockout primary neural stem cells.Consistent with this,inhibition of transforming growth factor-βsignaling with SB-431542 in wild-type neural stem cells stimulated proliferation while inhibited the migration of neural stem cells.Interestingly,deletion of transforming growth factor-βreceptor in neural stem cells in vivo inhibited the migration of postnatal born neurons in mGFAPcre-ALK5fl/fl-Ai9 mice,while abolishment of transforming growth factor-βsignaling in immature neuroblasts in DCXcreERT2-ALK5fl/fl-Ai9 mice did not affect the migration of these cells in the hippocampus.In summary,our data supports a dual role of transforming growth factor-βsignaling in the proliferation and migration of neural stem cells in vitro.Moreover,our data provides novel insights on cell type-specific-dependent requirements of transforming growth factor-βsignaling on neural stem cell proliferation and migration in vivo. 展开更多
关键词 adult neurogenesis doublecortin hippocampus migration neural stem cells proliferation transforming growth factor-β
暂未订购 下载PDF
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 2 … 250 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈