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Excitation direction and intensity-dependent damping performance of a nonlinear energy sink:theory and experiments 认领 引用
1
作者 Xiaofeng GENG Shican LIU +4 位作者 Li ZHANG Kexiang WEI Yingan KANG Xingjian JING Hu DING 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2026年第7期1433-1446,共14页
The traditional nonlinear energy sink(NES)exhibits high robustness over a wide frequency interval under unidirectional excitation.However,variable excitation directions and intensities are common in engineering applic... The traditional nonlinear energy sink(NES)exhibits high robustness over a wide frequency interval under unidirectional excitation.However,variable excitation directions and intensities are common in engineering applications,and the vibration reduction performance of the conventional NES remains uncertain.In this paper,a dynamic model of a linear oscillator(LO)equipped with an NES is established to investigate the effects of the excitation direction and intensity on the NES performance.Moreover,a three-dimensional model is designed,and a corresponding experimental platform is constructed.The vibration reduction performance of a conventional NES is theoretically investigated under variable excitation directions and intensities.Moreover,the dynamic characteristics are revealed for both free and forced vibrations.Experimental tests are conducted to validate the prediction results.This study demonstrates that the vibration suppression performance of the NES is highly sensitive to both the excitation direction and intensity.Overall,although the performance of the NES decreases with increasing excitation angle,vibration can be effectively suppressed over a wide angle range.This finding indicates that the traditional NES is highly robust to the excitation direction.In addition,the NES exhibits notable damping performance within a wide excitation range,especially at high excitation angles.For relatively low and very high excitation intensities,the performance of the NES is poor.The vibration reduction trend under the coupling effect of the excitation intensity and direction is systematically revealed.A critical excitation intensity is identified,at which the NES exhibits weaker performance at low angles but enhanced performance at high angles.The findings provide a theoretical basis for promoting NES engineering applications. 展开更多
关键词 nonlinear energy sink(NES) excitation direction excitation intensity passive suppression vibration reduction efficiency
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Spin-Excitation Response to Oxygen Deficiency in La3Ni2O7−δThin Films 认领 引用
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作者 Hengyang Zhong Bo Hao +9 位作者 Anni Chen Xinru Huang Chunyi Li Wenting Zhang Chang Liu Kurt Kummer Nicholas Brookes Yuefeng Nie Thorsten Schmitt Xingye Lu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第6期129-134,共6页
Oxygen stoichiometry has been identified as a key parameter controlling superconductivity in the bilayer nickelate La3Ni2O7-δ.Using resonant inelastic x-ray scattering,we systematically investigate the evolu... Oxygen stoichiometry has been identified as a key parameter controlling superconductivity in the bilayer nickelate La3Ni2O7-δ.Using resonant inelastic x-ray scattering,we systematically investigate the evolution of orbital and spin excitations in La3Ni2O7-δthin films with varying oxygen content.In vacuum-annealed samples,the suppression of the 1.6 eV dd excitation underπpolarization reflects apprecia-ble inner apical-oxygen vacancies,which locally disrupt the out-of-plane p-d hybridization and the corresponding interlayer superex-change pathways.Nevertheless,the oxygen-deficient films exhibit spin excitations originating from Q=(0.25,0.25)with a similar disper-sion to the as-grown sample,suggesting a mixed ground state of double spin stripe and spin-charge stripe orders with nearly identical spin correlations.By contrast,the magnon damping rate is slightly enhanced in the vacuum-annealed sample,reflecting a modest increase in electronic disorder associated with oxygen defects.Collectively,these findings reveal that short-range spin correlations in La3Ni2O7-δare insensitive to oxygen-vacancy-induced perturbations,including electron doping and local disruption of interlayer superex-change pathways,even in samples with appreciable oxygen deficiency,where the 1.6 eV dd excitation associated with Ni3dz2-O 2pz hybridization is suppressed by up to 58%. 展开更多
关键词 bilayer nickelate magnon damping resonant inelastic x ray scattering orbital excitations oxygen deficiency spin excitations spin correlations La Ni O
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Charge Excitations at Landau Level Crossings in WSe2-Encapsulated Bilayer Graphene 认领 引用
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作者 Yuxuan Zhu Zhecheng Li +6 位作者 Yixuan Xu Yurong Ling Zijun Lin Zhimou Chen Zhao Liu Hailong Fu Xi Lin 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第2期254-272,共19页
Skyrmions—topological spin/pseudospin textures—are natural charge excitations of quantum Hall(QH)ferromagnets.In a WSe2-encapsulated bilayer graphene(BLG)heterostructure,we tune the valley-only Landau level(LL)cr... Skyrmions—topological spin/pseudospin textures—are natural charge excitations of quantum Hall(QH)ferromagnets.In a WSe2-encapsulated bilayer graphene(BLG)heterostructure,we tune the valley-only Landau level(LL)crossings atν=±3 with an out-of-plane displacement field(D field)and use them as a platform to probe valley excitations.Activation gap measurements reveal a finite gap at degeneracy that rises sharply with D field near the crossing and exceeds the single-particle valley susceptibility,suggesting valley-skyrmion charge excitations.We quantify the skyrmion size and elucidate the mechanism governing its magnetic-field dependence.Similar behavior appears at valley-orbital and valley-spin entangled crossings(ν=±2 andν=±1,respectively).These results suggest controlled valley-skyrmion formation in BLG and open a route to engineering interacting multicomponent QH ferromagnets with tunable spin/pseudospin textures. 展开更多
关键词 quantum hall ferromagnets skyrmions WSe encapsulated bilayer graphene finite gap degeneracy Landau level crossings probe valley excitationsactivation gap measurements topological spin pseudospin textures charge excitations
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xLSTM⁃Based Excitation Current Prediction for Synchronous Machines Towards Electro⁃spindle Drives 认领 引用
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作者 CHE Zhongyuan PENG Chong +1 位作者 ZHANG Rui WANG Chi 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2026年第3期443-462,共20页
Accurate excitation current prediction is crucial for the high-performance control of synchronous machines(SMs),which are widely employed in industrial drives such as electro-spindles.However,achieving accurate and ge... Accurate excitation current prediction is crucial for the high-performance control of synchronous machines(SMs),which are widely employed in industrial drives such as electro-spindles.However,achieving accurate and generalizable prediction across multiple operating points is challenging due to coupled nonlinearities like thermal drift and magnetic saturation.This study proposes a novel prediction model based on the extended long short-term memory(xLSTM)network.The model integrates scalar LSTM(sLSTM)and matrix LSTM(mLSTM)units and leverages an exponential gating mechanism to enhance the capability for learning complex nonlinear mappings and long-term dependencies.Specifically,the vectorized parallel memory structure of sLSTM is suited to capturing slow parameter variations caused by thermal drift,while the matrix associative memory mechanism of mLSTM excels at learning multi-variable nonlinear coupling effects such as magnetic saturation.These two modules form a complementary hybrid architecture.Comparative analyses against traditional LSTM and gate recurrent unit(GRU)benchmarks were conducted using SM monitoring data covering various load and excitation conditions.In addition,an ablation study was performed using xLSTM with varying blending ratios of scalar and matrix LSTM components.Evaluation based on multiple error metrics and computational time demonstrates that the proposed xLSTM achieves superior accuracy,stronger generalization,lower computational overhead,and higher prediction stability.The underlying mechanisms are analyzed from architectural and algorithmic perspectives.These findings offer a novel datadriven modeling approach for SM excitation current,with potential value for applications requiring high-fidelity motor state estimation. 展开更多
关键词 synchronous machine excitation current modeling data-driven method extended long short-term memory(xLSTM)
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Noradrenergic excitation of astrocytes supports cognitive reserve 认领 引用
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作者 Robert Zorec Alexei Verkhratsky 《Neural Regeneration Research》 SCIE CAS CSCD 2026年第4期1546-1547,共2页
The concept of the brain cognitive reserve is derived from the well-acknowledged notion that the degree of brain damage does not always match the severity of clinical symptoms and neurological/cognitive outcomes.It ha... The concept of the brain cognitive reserve is derived from the well-acknowledged notion that the degree of brain damage does not always match the severity of clinical symptoms and neurological/cognitive outcomes.It has been suggested that the size of the brain(brain reserve) and the extent of neural connections acquired through life(neural reserve) set a threshold beyond which noticeable impairments occur.In contrast,cognitive reserve refers to the brain's ability to adapt and reo rganize stru cturally and functionally to resist damage and maintain function,including neural reserve and brain maintenance,resilience,and compensation(Verkhratsky and Zorec,2024). 展开更多
关键词 astrocytes brain reserve cognitive reserve clinical symptoms noradrenergic excitation neural reserve neural connections brain cognitive reserve
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Cavity-Enhanced Excitation of Molecules with Continuous-wave Lasers 认领 引用
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作者 Cun-Feng Cheng Shui-Ming Hu 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2026年第1期9-21,I0042,共13页
The precise excitation of molecular vibrational states is critical for ad-vancing chemical dynamics,preci-sion spectroscopy,and trace gas sensing.This objective,however,is often hindered by the weak oscilla-tor streng... The precise excitation of molecular vibrational states is critical for ad-vancing chemical dynamics,preci-sion spectroscopy,and trace gas sensing.This objective,however,is often hindered by the weak oscilla-tor strengths of ro-vibrational tran-sitions,which render conventional continuous-wave(cw)lasers ineffec-tive due to their limited power.This fundamental challenge is overcome by cavity-enhanced excitation(CEE),a technique that locks a cw laser to a high-finesse optical cavity.This configuration amplifies the intra-cavity light intensity by several orders of magnitude while preserving a narrow spectral linewidth.The resulting synergy enables highly efficient,state-selective population transfer and high-resolution spectroscopy previously considered impractical.This review elucidates the core technique of laser-cavity locking and highlights its applications,notably in the quantitative detection of trace isotopes and the investigation of highly excited vibrational states with kilo-hertz-level accuracy. 展开更多
关键词 Cavity-enhanced excitation Rovibrational spectroscopy Laser spectroscopy Two-photon spectroscopy
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Fluorescence excitation strategies driven by different energy sources:Mechanism,molecular/materials design,and cross-applications 认领 引用
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作者 Jingwen Zheng Yubo Tan +2 位作者 Dazhuang Xu Gang Liu Zhixiang Lu 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第6期87-99,共13页
As a technique with high sensitivity and resolution,fluorescence imaging is widely used in biomedical research,disease diagnosis and environmental monitoring,etc.Traditional fluorescence imaging mostly relies on photo... As a technique with high sensitivity and resolution,fluorescence imaging is widely used in biomedical research,disease diagnosis and environmental monitoring,etc.Traditional fluorescence imaging mostly relies on photoexcitation paradigms,but with the deepening of multidisciplinary cross research,fluorescence excitation strategies based on multiple energy sources have gradually become an emerging frontier.These innovative strategies achieve diversified excitation of fluorescent probes by using multiple external stimuli,such as electric energy,magnetic energy,chemical energy,electromagnetic radiation,optical energy and mechanical energy,providing more flexible choices for different application scenarios,which not only broaden the application scope of fluorescence technology but also provide a new way of thinking for the design of highly efficient and tunable fluorescence systems.To track the latest advancements in fluorescence excitation techniques,this review systematically summarizes the recent multiple energy sources,focusing on their mechanisms,design principles,application prospects and challenges.By synthesizing recent research progress,this work aims to highlight emerging excitation strategies and offer valuable insights for developing next-generation fluorescent probes and broadening the technological applications of fluorescence-based systems. 展开更多
关键词 Fluorescence imaging Fluorescence excitation strategies Mechanism Classification Cross-applications
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State-Resolved Ar II Population Distributions under Femtosecond Strong-Field Excitation 认领 引用
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作者 Di Wang Yuxuan Zhang +7 位作者 Zhigang Zheng Mingyue Wang Zhihui Lv Li Wang Xiaowei Wang Dongwen Zhang Jing Zhao Zengxiu Zhao 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第6期22-26,共5页
We measure spontaneous emission from Ar II ions produced by femtosecond strong-field excitation of argon and reconstruct state-resolved excited-state populations from selected emission lines spanning upper-level energ... We measure spontaneous emission from Ar II ions produced by femtosecond strong-field excitation of argon and reconstruct state-resolved excited-state populations from selected emission lines spanning upper-level energies of~19-23 eV above the Ar II ground state.The ionic-line intensities follow a power-law dependence on pulse energy and a non-monotonic dependence on gas pressure,and the extracted populations deviate significantly from a Boltzmann distribution.The deviation grows with increasing pulse energy,reflecting a stronger nonequilibrium character of the initial population prepared by the strong field,and weakens with increasing gas pressure,consistent with collisional redistribution driving the system toward thermal equilibrium.These results establish ionic fluorescence as a practical state-resolved probe of nonequilibrium population distributions in strong-field-ionized argon. 展开更多
关键词 femtosecond strong field excitation AR II ions emission lines boltzmann distributionthe spontaneous emission ionic line intensities population distributions state resolved
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Efficient methods for prediction and evaluation of compressor rotor blades forced response considering multiple excitation from asymmetric stators 认领 引用
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作者 Yuze ZHU Ping YANG +2 位作者 Jinzhang FENG Dingxi WANG Zhuo KOU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期294-308,共15页
Asymmetric stators,featuring nonuniform pitches,have demonstrated effectiveness in mitigating the forced response of the adjacent compressor rotor blades.However,the lack of comprehensive understanding of their vibrat... Asymmetric stators,featuring nonuniform pitches,have demonstrated effectiveness in mitigating the forced response of the adjacent compressor rotor blades.However,the lack of comprehensive understanding of their vibration reduction mechanisms hinders the development of optimal designs.Typically,the evaluation of rotor blades forced response using asymmetric stators requires fluid–structure interaction methods and full-annulus computational domains;however,these methods are time-consuming and resource-intensive,making them unsuitable for rapid engineering applications.To address these issues,the present study first develops a Fourier-based prediction method for the excitation spectrum and blade forced response that considers the impacts of multiple excitation components.To verify the accuracy of the prediction method,two typical asymmetric stator configurations are selected,and the forced response analyses with single-passage computational domains are conducted on their downstream rotor blades based on the rapid time inclination method.The results are then compared with those obtained using the dual time stepping method with whole-annulus computational domains.The results indicate that the proposed Fourier-based method can accurately predict the impacts of asymmetric stators on the forced response of the rotor blades.Moreover,the rapid evaluation approach based on the time inclination method provides comparable accuracy to the dual time stepping method,but with greater computational efficiency and reduced memory consumption. 展开更多
关键词 Asymmetric stators Nonuniform pitches Forced response Fourier-based method Multiple excitation components Time inclination method
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Nonlinear resonance of rotating solar-sail membrane under solar thermal and pressure excitations 认领 引用
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作者 Jinduo Chen Aiming Shi +1 位作者 Earl H.Dowell Yang Pei 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第1期325-343,共19页
This study explores the nonlinear resonance of a rotating solar sail membrane exposed to time-varying solar thermal and solar radiation pressure.The sail membrane is modeled using a cantilever membrane,applying the vo... This study explores the nonlinear resonance of a rotating solar sail membrane exposed to time-varying solar thermal and solar radiation pressure.The sail membrane is modeled using a cantilever membrane,applying the von Kármán theory for membrane large deflection.The membrane’s nonlinear equation is derived by employing the Lagrange equation while accounting for excitations from solar thermal and radiation pressure.The equation is solved via the Rayleigh-Ritz method.The bifurcation diagram of membrane motion is applied to reveal membrane resonance responses under different solar sail rotating frequencies.The displacement time history,phase portrait,Poincarémap,frequency spectrum,and the largest Lyapunov exponent are used to study nonlinear vibrations that occur near resonance regions.The results indicate that time-varying thermal loading excites membrane motions with multiple natural frequencies by the parametric resonance mechanics,leading to the onset of membrane chaotic motion.The membrane’s primary resonance is stimulated in harmonic oscillation by the time-varying radiation pressure.The divergence instability caused by thermal excitation is also illustrated by comparing the membrane’s vibration amplitude with and without thermal excitation.The membrane’s nonlinear vibration characteristics vary significantly with solar illumination angles,the membrane’s thermal expansion coefficients,and structural damping. 展开更多
关键词 Solar-sail membrane resonance Thermal excitation Parametrically excited system Chaos
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An efficient and flexible excitation method of gourd-shaped closed-loop high temperature superconducting stacked magnets 认领 引用
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作者 Yan-Chen Shi Yin-Shun Wang +2 位作者 Hao-Ran Dong Jun-Hao Liang Yu-Han Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第7期765-772,共8页
Gourd-shaped closed-loop high-temperature superconducting(HTS)stacked magnets are excited by the field cooling(FC)method and can operate in persistent current mode(PCM).While the FC method enables stable PCM operation... Gourd-shaped closed-loop high-temperature superconducting(HTS)stacked magnets are excited by the field cooling(FC)method and can operate in persistent current mode(PCM).While the FC method enables stable PCM operation,its efficiency is limited,and real-time magnetic field adjustment is challenging.According to the law of flux conservation of a superconducting closed loop,an efficient and flexible excitation method is proposed.That is,after the FC excitation process,a reverse current is passed through the excitation coil to generate a reverse magnetic flux,thereby stimulating the magnet to generate a higher magnetic field.Moreover,the magnetic field can be flexibly adjusted by changing the excitation current during the operation of the magnet.Taking the single gourd-shaped HTS plate as the research object,the feasibility of the proposed excitation method is verified through finite element simulations and experiments.The excitation effects of the two methods under the same excitation conditions are compared,and the relationship between magnetic flux density and excitation current is obtained.Results show that the proposed excitation method can stimulate the gourd-shaped HTS magnet to generate a high-intensity magnetic field,and the magnetic field of a single HTS plate is increased by 99.1% compared with that of the FC method under the same excitation conditions.Additionally,the magnetic field intensity can be flexibly adjusted as needed by changing the excitation current during operation. 展开更多
关键词 high temperature superconducting magnet magnetic flux conservation field cooling method excitation efficiency
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Robust excitation of 229Th via generalized composite pulses:Compensating generic errors across arbitrary pulse shapes 认领 引用
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作者 Rui Zhao Yingdan Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第6期125-133,共9页
High-ffiifidelity coherent control is a universal challenge due to complex errors and imperfect pulse shapes.Here,we propose a generalized composite pulses scheme independent of pulse proffiifile to correct generic er... High-ffiifidelity coherent control is a universal challenge due to complex errors and imperfect pulse shapes.Here,we propose a generalized composite pulses scheme independent of pulse proffiifile to correct generic errors.This approach could simultaneously compensate for pulse area errors,detuning,and phase imperfections.We demonstrate its application in the direct laser excitation of the 229Th nucleus isomer state,and show a signiffiificant improvement in the robustness against various operation errors,such as detuning,phase error,and pulse area error. 展开更多
关键词 thorium-229 isomeric state nuclear excitation composite pulses
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Rydberg-State Excitation and Ionization of Argon Atoms Subject to Strong Circularly Polarized Two-Color Few-Cycle Laser Fields 认领 引用
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作者 Zhiqiang Wang Wei Quan +3 位作者 Yanlan Wang Xiaolei Hao Jing Chen Xiaojun Liu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2025年第5期12-20,共9页
The ultrafast excitation dynamics of atoms and molecules exposed to circularly polarized two-color(CPTC)laser fields constitute a fascinating topic in attosecond science. Although extensive research has established th... The ultrafast excitation dynamics of atoms and molecules exposed to circularly polarized two-color(CPTC)laser fields constitute a fascinating topic in attosecond science. Although extensive research has established the relationship between the Rydberg state excitation(RSE) yields and the CPTC field parameters, such as field amplitude ratios and helicity of two components, the role of the relative phase(φ) in modulating RSE efficiency remains unclear. In this work, we theoretically investigate the φ dependence of RSE and ionization yields in the co-rotating and counter-rotating circularly polarized two-color(CPTC) few-cycle laser fields by a semiclassical model. We find that, in co-rotating CPTC fields, both RSE and ionization yields display pronounced oscillations as a function of φ and these oscillations are significantly suppressed in the counter-rotating configuration, particularly for ionization yields. Moreover, the ratio of RSE to ionization yields exhibits an out-of-phase oscillatory pattern between low-and high-intensity regimes. These results can be comprehended by the unique feature of φ dependence of CPTC few-cycle fields, based on our semiclassical analysis. Our results demonstrate that phase-controlled CPTC fields offer a versatile tool for steering ultrafast ionization and RSE dynamics of atoms and molecules. 展开更多
关键词 ionization theoretically investigate dependence ultrafast excitation dynamics field parameters helicity two components attosecond science rydberg state excitation rse Rydberg state excitation
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Dynamics of Electric Field Perturbation in Gold Nanobipyramids During Dual-Pulse Two-Photon Coherent Excitation 认领 引用
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作者 Qiong Li Yao Li 《Journal of Electronic Research and Application》 2026年第3期141-147,共7页
Optical-based microwave electric field detection has emerged as a research hotspot due to its advantages of high spatial resolution and immunity to electromagnetic interference.However,existing techniques are often li... Optical-based microwave electric field detection has emerged as a research hotspot due to its advantages of high spatial resolution and immunity to electromagnetic interference.However,existing techniques are often limited by their sensitivity or reliance on specialized fluorescent materials.Gold nanobipyramids(AuNBPs),serving as nanoprobes with tip-enhancement effects and a well-defined three-level system,exhibit high sensitivity in their two-photon photoluminescence(TPPL)process to phase perturbations and plasmon resonance changes induced by microwave fields.By establishing a quantitative mapping model between microwave intensity and TPPL signal strength,we achieved an absolute measurement of microwave field strength with a spatial resolution that breaks the 100-nanometer barrier.Through comparative analysis of microwave responses under different pulse delays,we reveal that the microwave field primarily modulates TPPL intensity by interfering with the coherent excitation pathway.The most significant response of TPPL intensity to microwave power was observed near the zero-delay point,where the quantum coherence is strongest. 展开更多
关键词 Two-photon photoluminescence Dual-pulse coherent excitation Gold nanobipyramids Microwave electric field perturbation
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First Experimental Observation of Graviton Excitation Offering New Possibility for Exploration of Quantum Gravity 认领 引用
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《Bulletin of the Chinese Academy of Sciences》 2026年第2期92-96,共5页
Prof.DU Lingjie from Nanjing University has won the 2026 Tan Kah Kee Young Scientist Award in Mathematics and Physics.He successfully observed the graviton excitation in the fractional quantum Hall effect,marking the ... Prof.DU Lingjie from Nanjing University has won the 2026 Tan Kah Kee Young Scientist Award in Mathematics and Physics.He successfully observed the graviton excitation in the fractional quantum Hall effect,marking the first-time-ever detection of a graviton-like quasiparticle in a real system.Providing experimental evidence for a new geometric description of the fractional quantum Hall effect,this has initiated a new direction for the research of strongly correlated quantum systems from a geometric perspective,and has opened a new path to explore quantum gravity.Prof.DU also carried out original experiments to extend the graviton mode to the bosonic system. 展开更多
关键词 strongly correlated quantum systems fractional quantum hall effectthis geometric description fractional quantum hall effect research strongly correlated quantum systems quantum gravity fractional quantum hall effectmarking observed graviton excitation
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DaC-GANSAEBF:Divide and Conquer-Generative Adversarial Network-Squeeze and Excitation-Based Framework for Spam Email Identification 认领 引用 被引量：1
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作者 Tawfeeq Shawly Ahmed A.Alsheikhy +4 位作者 Yahia Said Shaaban M.Shaaban Husam Lahza Aws I.Abu Eid Abdulrahman Alzahrani 《Computer Modeling in Engineering & Sciences》 SCIE EI 2025年第3期3181-3212,共32页
Email communication plays a crucial role in both personal and professional contexts;however,it is frequently compromised by the ongoing challenge of spam,which detracts from productivity and introduces considerable se... Email communication plays a crucial role in both personal and professional contexts;however,it is frequently compromised by the ongoing challenge of spam,which detracts from productivity and introduces considerable security risks.Current spam detection techniques often struggle to keep pace with the evolving tactics employed by spammers,resulting in user dissatisfaction and potential data breaches.To address this issue,we introduce the Divide and Conquer-Generative Adversarial Network Squeeze and Excitation-Based Framework(DaC-GANSAEBF),an innovative deep-learning model designed to identify spam emails.This framework incorporates cutting-edge technologies,such as Generative Adversarial Networks(GAN),Squeeze and Excitation(SAE)modules,and a newly formulated Light Dual Attention(LDA)mechanism,which effectively utilizes both global and local attention to discern intricate patterns within textual data.This approach significantly improves efficiency and accuracy by segmenting scanned email content into smaller,independently evaluated components.The model underwent training and validation using four publicly available benchmark datasets,achieving an impressive average accuracy of 98.87%,outperforming leading methods in the field.These findings underscore the resilience and scalability of DaC-GANSAEBF,positioning it as a viable solution for contemporary spam detection systems.The framework can be easily integrated into existing technologies to enhance user security and reduce the risks associated with spam. 展开更多
关键词 Email spam fraud light dual attention squeeze and excitation divide and conquer-generative adversarial network-squeeze and excitation-based framework security
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Oxytocin ameliorates cognitive impairments by attenuating excitation/inhibition imbalance of neurotransmitters acting on parvalbumin interneurons in a mouse model of sepsisassociated encephalopathy 认领 引用 被引量：1
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作者 Renqi Li Qiuting Zeng +5 位作者 Muhuo Ji Yue Zhang Mingjie Mao Shanwu Feng Manlin Duan Zhiqiang Zhou 《Journal of Biomedical Research》 CAS CSCD 2025年第2期132-145,共14页
Inflammation plays a crucial role in the initiation and progression of sepsis and induces alterations in brain neurotransmission, thereby contributing to the development of sepsis-associated encephalopathy(SAE).Parval... Inflammation plays a crucial role in the initiation and progression of sepsis and induces alterations in brain neurotransmission, thereby contributing to the development of sepsis-associated encephalopathy(SAE).Parvalbumin(PV) interneurons are pivotal contributors to cognitive processes and have been implicated in various central nervous system dysfunctions, including SAE. Oxytocin, known for its ability to augment the firing rate of gamma-aminobutyric acid(GABA)-ergic interneurons and directly stimulate inhibitory interneurons to enhance the tonic inhibition of pyramidal neurons, has prompted an investigation into its potential therapeutic effects on cognitive dysfunction in SAE. In the current study, we administered intranasal oxytocin to SAE mice induced by lipopolysaccharide. Behavioral assessments, including open field, Y-maze, and fear conditioning, were used to evaluate cognitive performance. Golgi staining revealed hippocampal synaptic deterioration, local field potential recordings showed weakened gamma oscillations, and immunofluorescence staining demonstrated decreased PV expression in the cornu ammonis 1(CA1) region of the hippocampus following lipopolysaccharide treatment, all of which were alleviated by oxytocin administration. Furthermore, immunofluorescence staining of PV co-localization with vesicular glutamate transporter 1 or vesicular GABA transporter indicated a balanced excitation/inhibition effect of neurotransmitters on PV interneurons after oxytocin administration in the SAE mice, leading to an improved cognitive function. In conclusion, oxytocin treatment improved cognitive function by increasing the number of PV+ neurons in the hippocampal CA1 region, restoring the balance of excitatory/inhibitory synaptic transmission on PV interneurons, and enhancing hippocampal CA1 local field potential gamma oscillations. These findings suggest a potential mechanism underlying the beneficial effects of oxytocin in SAE. 展开更多
关键词 excitation/inhibition balance oxytocin cognitive sepsis-associated encephalopathy
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Using Targeted Phonon Excitation to Modulate Thermal Conductivity of Boron Nitride 认领 引用 被引量：1
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作者 Dongkai Pan Tianhao Li +3 位作者 Xiao Wan Zhicheng Zong Yangjun Qin Nuo Yang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2025年第7期449-453,共5页
Recent advancements in thermal conductivity modulating strategies have shown promising enhancements to the thermal management capabilities of two-dimensional materials.In this article,both the iterative Boltzmann tran... Recent advancements in thermal conductivity modulating strategies have shown promising enhancements to the thermal management capabilities of two-dimensional materials.In this article,both the iterative Boltzmann transport equation solution and the two-temperature model were employed to investigate the efficacy of targeted phonon excitation applied to hexagonal boron nitride(hBN).The results indicate significant modifications to hBN's thermal conductivity,achieving increases of up to 30.1%as well as decreases of up to 59.8%.These findings validate the reliability of the strategy,expand its scope of applicability,and establish it as a powerful tool for tailoring thermal properties across a wider range of fields. 展开更多
关键词 thermal conductivityachieving thermal management capabilities boron nitride targeted phonon excitation iterative boltzmann transport equation solution hexagonal boron nitride hbn thermal conductivity modulating strategies thermal conductivity
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Dynamic Behavior of a Pipe Conveying a Gas-Liquid Two-Phase Flow Under External Excitations 认领 引用 被引量：1
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作者 FU Guang-ming WANG Xiao +4 位作者 JIAO Hui-lin WANG Bo-ying SHAN Zheng-feng SUN Bao-jiang SU Jian 《China Ocean Engineering》 SCIE EI CSCD 2025年第5期822-838,共17页
This work investigated the dynamic behavior of vertical pipes conveying gas-liquid two-phase flow when subjected to external excitations at both ends.Even with minimal excitation amplitude,resonance can occur when the... This work investigated the dynamic behavior of vertical pipes conveying gas-liquid two-phase flow when subjected to external excitations at both ends.Even with minimal excitation amplitude,resonance can occur when the excitation frequency aligns with the natural frequency of the pipe,significantly increasing the degree of operational risk.The governing equation of motion based on the Euler-Bernoulli beam is derived for the relative deflection with stationary simply supported ends,with the effects of the external excitations represented by source terms distributed along the pipe length.The fourth-order partial differential equation is solved via the generalized integral transform technique(GITT),with the solution successfully verified via comparison with results in the literature.A comprehensive analysis of the vibration phenomena and changes in the motion state of the pipe is conducted for three classes of external excitation conditions:same frequency and amplitude(SFSA),same frequency but different amplitudes(SFDA),and different frequencies and amplitudes(DFDA).The numerical results show that with increasing gas volume fraction,the position corresponding to the maximum vibration displacement shifts upward.Compared with conditions without external excitation,the vibration displacement of the pipe conveying two-phase flow under external excitation increases significantly.The frequency of external excitation has a significant effect on the dynamic behavior of a pipe conveying two-phase flow. 展开更多
关键词 pipe conveying fluid integral transform two-phase flow external excitations dynamic response forced vibrations
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Role of Degenerate States on Molecular Excitation by Intense Laser Pulses 认领 引用
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作者 Bo Li Yan Rong Liu +6 位作者 Victor Kimberg Maomao Gong Yongjun Cheng Yong Wu Jian Guo Wang Jing Chen Song Bin Zhang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2025年第11期75-82,共8页
A singlet diatomic molecule naturally carries doubly degenerate ±Λ states when the projection of the total electronic angular momentum onto the internuclear axis is nonzero. These doubly degenerate states contri... A singlet diatomic molecule naturally carries doubly degenerate ±Λ states when the projection of the total electronic angular momentum onto the internuclear axis is nonzero. These doubly degenerate states contribute equally in conventional measurements and are thus treated the same in corresponding simulations. In this study, we demonstrate that in resonant excitation by intense laser pulses, the doubly degenerate ±Λ states must be clearly identified. This is exemplified in the X1Σ → A1Π transition of CO molecules. This distinction becomes especially important in the case of circularly polarized radiation. We attribute this phenomenon to the interference of electron-rotational pathways in the strong-field coupled transition with the ±Λ-state of the excited Π state. This research sheds light on the fundamental aspects of intense laser-molecule interactions when extending conventional theories. 展开更多
关键词 doubly degenerate states resonant excitation intense laser pulses degenerate states molecular excitation conventional measurements intense laser pulses singlet diatomic molecule angular momentum
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