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Turbo Equalization for Time-Varying Underwater Acoustic Channels with Imperfect Channel State Information 认领 引用
1
作者 Jiaheng Zhang Wei Ge +1 位作者 Wentao Tong Lin Cheng 《哈尔滨工程大学学报（英文版）》 CSCD 2026年第2期630-639,共10页
Turbo equalization is commonly employed to compensate for multipath propagation in underwater acoustic(UWA)communication.However,the performance of turbo equalization degrades due to the imperfect channel state inform... Turbo equalization is commonly employed to compensate for multipath propagation in underwater acoustic(UWA)communication.However,the performance of turbo equalization degrades due to the imperfect channel state information(CSI)and time-varying channels.Herein,we first introduce a new derivation for turbo equalization based on the joint Gaussian criterion.On the basis of this derivation,a novel turbo equalization algorithm for time-varying UWA channels with imperfect CSI is proposed.The algorithm combines the imperfect CSI with the temporal coherence characteristics of UWA channels,which are modeled as a first-order autoregressive(AR(1))process,to achieve a more accurate channel a posteriori distribution.Afterward,the refined distribution is incorporated into the design of the turbo equalizer,which can effectively reduce intersymbol interference and the Doppler effect.Simulation results show that the proposed algorithm has a better bit error rate performance than other turbo equalization algorithms with channel estimation error compensation or the AR(1)process for any iteration in fast time-varying scenarios. 展开更多
关键词 Imperfect channel state information First-order autoregressive process Turbo equalization Time-varying channels Underwater acoustics communication
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Study on the interaction and evolution of surface dielectric barrier discharge channels 认领 引用
2
作者 Hui Jiang Jinyu Tang Yufei Han 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第3期372-378,共7页
The dynamic evolution characteristics of the discharge channel are a key factor influencing the plasma distribution of surface dielectric barrier discharge(SDBD).In this paper,a novel oblique dual-tip SDBD actuator st... The dynamic evolution characteristics of the discharge channel are a key factor influencing the plasma distribution of surface dielectric barrier discharge(SDBD).In this paper,a novel oblique dual-tip SDBD actuator structure is proposed to investigate the multi-stage development mechanism of discharge channels.Experimental results demonstrate that when the oblique angle between the two tips ranges from 30°to 90°,strong mutual repulsion occurs between the discharge channels,with the repulsion intensity increasing as the voltage amplitude increases.When the tip angle is 120°,the dynamic evolution of the discharge channel exhibits three distinct stages.In the initial stage,localized ionization occurs near the leading edge of each tip,forming two independent discharge channels.Then the channels merge and extend along a specific direction,creating a single dominant filament.The current between the two tip electrodes was measured,demonstrating the existence of connected discharge channels.In the final stage,the front of the channel develops multistage bifurcation.The study of the three stages of discharge channel development contributes to exploring the mechanisms of mutual exclusion and fusion between discharge channels.These findings provide a theoretical basis for optimizing the structural design and application of SDBD actuators in related fields. 展开更多
关键词 oblique dual-tip surface dielectric barrier discharge multiple discharge channels discharge pattern channel interaction
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Deep-Water Erosional Channels Associated with Fluid Escape Structures in the Qiongdongnan Basin,Northwestern South China Sea 认领 引用
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作者 SUN Yue WANG Dawei +3 位作者 WANG Weiwei CANALS Miquel ZHAO Le QI Mingzhu 《Journal of Ocean University of China》 SCIE CAS CSCD 2026年第2期489-504,共16页
Deep-water channels can deliver vast amounts of sediment from land to deep-water settings and potentially host or sequester hydrocarbon resources within associated sand-rich deposits.However,the fluid migration proces... Deep-water channels can deliver vast amounts of sediment from land to deep-water settings and potentially host or sequester hydrocarbon resources within associated sand-rich deposits.However,the fluid migration processes linking deep-sourced fluids with submarine channels remain poorly understood.Based on 3D seismic data from the Qiongdongnan Basin,northwestern South China Sea,this study identifies two buried channels and their underlying fluid escape systems.The channels exhibit erosional incisions,with high-amplitude anomalies at their bases,suggesting the occurrence of coarse-grained sediments.In shallower strata,extensively distributed high-amplitude reflections are interpreted as gas-bearing overbank sandy deposits,whereas some negative-polarity reflections are recognized as bottom-simulating reflectors,indicating the boundary between overlying gas hydrate-bearing sediments and underlying free gas.Erosional channel margins and adjacent enhanced amplitude reflectors further suggest that these margins serve as efficient pathways for fluid migration.Additionally,a fluid escape chimney,characterized by blanking and disrupted reflectors,has been identified beneath the channels,implying focused fluid ascent from deeper levels.Taken together,these features indicate that deep-sourced fluid migrates upward through fluid escape chimneys,accumulates at the channel bottom within sandy deposits,and subsequently disperses laterally along the erosional channel margins into the shallow horizontal overbank deposits.This coupling between submarine channels and fluid escape structures creates a complex fluid flow system characterized by diverse fluid migration pathways at different stratigraphic levels.The findings highlight the significance of submarine channels and fluid escape chimneys in fluid migration,offering insights that may be applicable to other basins. 展开更多
关键词 chimney fluid escape gas hydrate submarine channel South China Sea
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Robust connectivity in time-frequency dual fading channels for the 6G satellite IoT:chirp and FRFT 认领 引用
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作者 Wenliang Lin Xinghao Cao +6 位作者 Ke Wang Zhongliang Deng Yishan He Kejia Cui Yaohua Deng Da Wan Zhiwei He 《Digital Communications and Networks》 SCIE EI CSCD 2026年第2期375-387,共13页
With the development of Sixth-Generation(6G)mobile communication technologies,Low Earth Orbit(LEO)satellite communication systems have become extremely important in mobile communications owing to their large coverage,... With the development of Sixth-Generation(6G)mobile communication technologies,Low Earth Orbit(LEO)satellite communication systems have become extremely important in mobile communications owing to their large coverage,high efficiency,and low cost.However,the high dynamic LEO satellite channels cause serious time-frequency dual selective fading,significantly impairing the performance of conventional single time or frequency domain synchronization algorithms and limiting their applicability.To address these challenges,this paper proposes a synchronization algorithm based on Linear Frequency Modulation(LFM)signals and the Fractional Fourier Transform(FRFT).Exploiting the inherent robustness of LFM signals against frequency deviations and multipath effects,coupled with their energy concentration property in the optimal fractional Fourier domain,the proposed algorithm enables efficient synchronization with enhanced resilience to time-frequency variations.Furthermore,LFM preamble sequences are optimally designed for diverse channel conditions.This work presents a theoretical analysis of the time-frequency nonstationary characteristics of LEO satellite channels and discusses the performance limitations of traditional synchronization algorithms.The proposed integrated FRFTLFM synchronization framework and sequence optimization scheme are rigorously evaluated via comprehensive simulations.The results demonstrate substantial improvements in synchronization accuracy and computational efficiency compared with conventional methods,particularly under time-frequency dual selective fading LEO satellite channels.The algorithm provides a robust and reliable solution for time-frequency synchronization in LEO satellite communication systems,thereby enhancing overall system performance and reliability. 展开更多
关键词 Time-frequency synchronization Linear frequency modulation Fractional fourier transform Low earth orbit satellite communications Nonstationary channel
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Topology Optimization of Cooling Channels with Conjugate Heat Transfer under Non-Uniform Heat Sources 认领 引用
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作者 Jingjie He Yuhui Jing Xiaopeng Zhang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第4期343-373,共31页
In high-heat-flux environments,traditional cooling channels often fail to satisfy concurrent requirements for high heat transfer efficiency,temperature uniformity,and minimal pumping power.This study proposes an engin... In high-heat-flux environments,traditional cooling channels often fail to satisfy concurrent requirements for high heat transfer efficiency,temperature uniformity,and minimal pumping power.This study proposes an engineering-oriented topology optimization method for fluid-solid conjugate heat transfer to address the conflict between thermal performance and flow resistance under non-uniform heat sources.We introduce a pseudo-threedimensional conjugate heat transfer model governed by Darcy’s law.This formulation retains three-dimensional effects,such as sidewall conduction and non-uniform surface heat flux.Moreover,the governing equations are reduced to two dimensions,thereby significantly enhancing computational efficiency.To resolve the discrepancy between Darcy flow and high-Reynolds-number turbulence,the permeability parameter is calibrated against high-fidelity turbulence simulations,ensuring macroscopic consistency with realistic flow behavior.Using this calibrated model,we perform multi-condition topology optimization for various inlet-outlet configurations under non-uniform heat sources.The optimized designs are reconstructed into three-dimensional geometries and validated via numerical simulations.Compared to conventional straight channel designs,the optimized configurations exhibit better performance,demonstrating reduced peak temperatures,enhanced temperature uniformity,and controlled pressure drops.These findings validate the efficacy of the proposed method for advanced thermal management applications. 展开更多
关键词 Fluid topology optimization conjugate heat transfer pseudo-three-dimensional model non-uniform heat source cooling channel design
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Adaptive Denoising Diffusion Null-Space Models for Semantic Communications over MIMO Channels 认领 引用
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作者 Tao Meixia Chen Zhiyong +2 位作者 Duan Yiheng Wu Tong Zhang Hongwei 《China Communications》 SCIE EI CSCD 2026年第4期312-329,共18页
Multiple-input multiple-output(MIMO)systems are essential for improving capacity and reliability in semantic communications.Existing methods mainly design the channel-aware neural networks but neglect the underlying s... Multiple-input multiple-output(MIMO)systems are essential for improving capacity and reliability in semantic communications.Existing methods mainly design the channel-aware neural networks but neglect the underlying signal distribution.In this paper,we develop a denoising diffusion null-space model-based module over MIMO channels(DDNM-MIMO),which is a plug-in module deployed at the receiver.By modeling the MIMO channel,precoding,and equalization as a linear transformation with additive noise,we design corresponding linear and scaling matrices to construct a sampling process for denoising the received signal.The DDNM-MIMO integrates channel state information(CSI)embedding,supporting both closed-loop MIMO with CSI at the transmitter and open-loop MIMO with CSI at the receiver,thereby improving channel adaptability across various noise levels.As a plug-in,the DDNM-MIMO module operates independently of the joint source-channel coding(JSCC)coder structure,offering flexible integration into diverse systems.Experimental results show that DDNM-MIMO effectively reduces the mean square errors(MSE)between the encoded and equalized signals.Consequently,the proposed DDNM-MIMO semantic communication system achieves superior image reconstruction performance compared to existing JSCC-based semantic communication method. 展开更多
关键词 channel state information(CSI) diffusion model(DM) multiple-input multiple-output(MIMO) semantic communications
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A double-layer reflective metasurface with increased polarization independent channels through rotating array 认领 引用
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作者 Bo YIN Xiaoliang LI Shubin WANG 《Optoelectronics Letters》 EI 2026年第6期337-343,共7页
The implementation of multifunctional metasurfaces through loading diodes has extremely high costs,while increasing the number of channels in the element through polarization multiplexing technology is limited.This pa... The implementation of multifunctional metasurfaces through loading diodes has extremely high costs,while increasing the number of channels in the element through polarization multiplexing technology is limited.This paper proposes a dual-band five-channel(DBFC)1-bit surface,which expands the polarization independent(PD)channels through rotating array.The polarization-independent metasurface element consists of three layers of metal,with the top layer comprising three rectangular patches oriented in the x-direction,the middle layer featuring a Jerusalem cross structure with accompanying resonators,and the bottom layer being a metal ground plane.The middle layer element can easily independently provide the required 1-bit reflection phases for two orthogonal polarizations in every frequency.The rectangular patches in the x-direction on the top layer do not contribute to the phase of y-polarization.By rotating the upper layer dielectric array 90°,the rectangular patches change to the y-direction.Under y-polarized illumination,the current distribution in the middle layer is shielded,providing a fifth set of polarization independent phases.The proposed 1-bit DBFC metasurface array has advantages in terms of structure and cost,while enhancing the utilization rate of the metasurface array.It has high application potential in microwave imaging,wireless power transmission,and other projects. 展开更多
关键词 Polarization independent channels Rotating array multifunctional metasurfaces loading diodes three rectangular patches Double layer reflective metasurface rotating arraythe polarization multiplexing technology
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Pre‐Established Zincophilic Na2SiO3Decorated Array‐Like Channels to Regulate the Zn2þFlux and Interfacial Corrosion for Dendrite‐Free Zinc Anode 认领 引用
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作者 Xiangzhong Kong Jun Cao +6 位作者 Yanting Cai Yuyang Ding Zicong Wang Liya Rong Xi Chen Zhongmin Wan Jiande Lin 《Rare Metals》 SCIE EI CAS CSCD 2026年第6期536-548,共13页
Aqueous zinc‐ion batteries(AZIBs)have attracted increasing attention in energy storage owing to their high energy density,low redox potential,and cost‐effectiveness.Nevertheless,uncontrolled dendrite accumulation,ga... Aqueous zinc‐ion batteries(AZIBs)have attracted increasing attention in energy storage owing to their high energy density,low redox potential,and cost‐effectiveness.Nevertheless,uncontrolled dendrite accumulation,gas generation,and severe side‐reaction problems hinder the cycling lifespan,which prevents their commercial applications.Herein,array‐like porous channels decorated by Na2SiO3sites were in situ created on the diatomite layers by etching with NaOH(DH).DFT calculation results demonstrate that in situ formed Na2SiO3possesses improved Zn2+affinity.The negative 3D porous channels combined with zincophilic Na2SiO3sites provide a fast Zn2+transport pathway and facilitate the ion‐pair dissociation of ZnSO4,ensuring favorable Zn2+transfer kinetics and inhibited side reactions.Moreover,the ordered array‐like structure not only can exert a spatial confinement effect to suppress the 2D diffusion of Zn2+but also drive Zn metal preferential deposit toward the rigid microaligned channels and curb the formation of large‐scale zinc dendrites.Additionally,the hydrophobic diatomite protective layer can accelerate desolvation kinetics of Zn(H2O)62+and suppress the hydrogen evolution reactions.As a result,the DH‐modified Zn anode(DH@Zn)achieves a long cycle lifespan of 2500 h at 1 mA cm−2,much more than that of bare Zn(~100 h lifespan)in symmetrical cells.Besides,the DH@Zn//NH4V4O10(NVO)full cells demonstrate a high‐capacity retention of 93.3%after 1800 cycles at 5 A g−1.This work provides a promising strategy and new insights into the design of electrolyte‐anode interfacial protection. 展开更多
关键词 aqueous zinc ion batteries array‐like porous channels dendrite‐free Zn anode hydrophobic diatomite protective layer zincophilic Na2SiO3sites
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Generalized Kennedy receivers enhanced CV-QKD in turbulent channels for endogenous security of space-air-ground integrated network 认领 引用
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作者 Shouye Miao Mugen Peng +3 位作者 Renzhi Yuan Bin Cao Mufei Zhao Zhifeng Wang 《Digital Communications and Networks》 SCIE EI CSCD 2026年第2期332-342,共11页
Endogenous security in next-generation wireless communication systems attracts increasing attentions in recent years.A typical solution to endogenous security problems is the Quantum Key Distribution(QKD),where uncond... Endogenous security in next-generation wireless communication systems attracts increasing attentions in recent years.A typical solution to endogenous security problems is the Quantum Key Distribution(QKD),where unconditional security can be achieved thanks to the inherent properties of quantum mechanics.Continuous Variable-Quantum Key Distribution(CV-QKD)enjoys high Secret Key Rate(SKR)and good compatibility with existing optical communication infrastructure.Traditional CV-QKD usually employ coherent receivers to detect coherent states,whose detection performance is restricted to the standard quantum limit.In this paper,we employ a generalized Kennedy receiver called CD-Kennedy receiver to enhance the detection performance of coherent states in turbulent channels,where Equal-Gain Combining(EGC)method is used to combine the output of CD-Kennedy receivers.Besides,we derive the SKR of a post-selection based CV-QKD protocol using both CD-Kennedy receiver and homodyne receiver with EGC in turbulent channels.We further propose an equivalent transmittance method to facilitate the calculation of both the Bit-Error Rate(BER)and SKR.Numerical results show that the CD-Kennedy receiver can outperform the homodyne receiver in turbulent channels in terms of both BER and SKR performance.We find that BER and SKR performance advantage of CD-Kennedy receiver over homodyne receiver demonstrate opposite trends as the average transmittance increases,which indicates that two separate system settings should be employed for communication and key distribution purposes.Besides,we also demonstrate that the SKR performance of a CD-Kennedy receiver is much robust than that of a homodyne receiver in turbulent channels. 展开更多
关键词 CV-QKD Endogenous security Generalized Kennedy receiver Space-air-ground integrated network Turbulent channels
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Irreversibility versus incompatibility of quantum channels 认领 引用
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作者 Yi Guo Shunlong Luo 《Communications in Theoretical Physics》 SCIE CAS CSCD 2026年第4期24-32,共9页
Both irreversibility and incompatibility are important features of quantum channels.Irreversibility of quantum channels characterizes the fundamental limitation in reconstructing information from their outputs.This co... Both irreversibility and incompatibility are important features of quantum channels.Irreversibility of quantum channels characterizes the fundamental limitation in reconstructing information from their outputs.This concept has traditionally been studied for individual channels in a global sense.In this work we generalize the conventional definition of reversible channels to relatively reversible channels,where a quantum channel is reversible relative to another one;thus it is in a relative sense.Incompatibility refers to the impossibility of simultaneously implementing certain pairs of quantum channels,and lies at the very heart of quantum theory.By leveraging the concept of complementary channels,we obtain a direct connection between relative reversibility and channel compatibility.We further propose a quantifier of channel irreversibility in terms of incompatibility between the complementary channels and the identity channel.To illustrate and compare the quantifier of irreversibility with some other quantifiers in the literature,we evaluate them for some prototypical channels.Our results provide insights into the interplay between irreversibility and incompatibility,which may have potential applications in quantum error correction and the resource theory of incompatibility. 展开更多
关键词 reversibility/irreversibility compatibility/incompatibility quantum channel complementary channel Jordan negativity
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Artificial transmembrane channels displaying mechanosensitivity 认领 引用
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作者 Ji-Pan Dong Lei Zhang +2 位作者 Yi-Fei Hu Mo Sun Jun-Li Hou 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第3期509-513,共5页
Mechanosensitive channel proteins serve important physiological functions in biological systems.Building artificial transmembrane channels to mimic the function of natural channels would provide a new strategy for tre... Mechanosensitive channel proteins serve important physiological functions in biological systems.Building artificial transmembrane channels to mimic the function of natural channels would provide a new strategy for treating channel-related diseases.In this paper,we describe the design and construction of artificial channels derived from pillar[5]arene backbones with different flexibilities,which are determined by the alkyl chain length.Importantly,the ion transport activities of the channels can be activated by increasing the membrane curvature and tension,which endows the channel with mechano-gating behavior. 展开更多
关键词 Artificial channel Mechanosensitive arene Ion transport Membrane tension Membrane curvature
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VOF-Based Simulation of Turbulent Air-Water Flow over Gravel Beds in Open Channels 认领 引用
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作者 Abdullah Abdullah Ghulam Mohi Ud Din +2 位作者 Tipu Sultan Muhammad Aleem Muhammad Shareef Shazil 《Fluid Dynamics & Materials Processing》 EI 2026年第3期18-35,共18页
Turbulent flow over gravel beds in open channels is a fundamental yet complex problem in hydraulic engineering,as flow behavior is highly sensitive to channel geometry and bed roughness.In this study,the Volume of Flu... Turbulent flow over gravel beds in open channels is a fundamental yet complex problem in hydraulic engineering,as flow behavior is highly sensitive to channel geometry and bed roughness.In this study,the Volume of Fluid(VOF)method coupled with the standard k-εturbulence model is employed to simulate air-water interactions over gravel beds,with open boundary conditions capturing realistic channel-atmosphere interactions.Numerical simulations are performed to examine how channel design influences the relationship between the friction factor(f)and the Reynolds number(RN).Velocity and VOF contours indicate peak flow near the inlet,with a maximum velocity of 0.64 m/s.The simulations show strong agreement with theoretical predictions,yielding a correlation coefficient of 0.99 for RN,while f and Chezy’s coefficient(C)reach 0.75 and 0.71,respectively.Comparison with experimental measurements shows deviations of approximately 17% for RN,25% for f,and 12% for C.Moreover,further analysis confirms an inverse linear relationship between f and RN,in accordance with classical models such as Bazin’s curves,the Colebrook equation,and Moody’s approximation.Overall,the results demonstrate that the proposed numerical framework reliably captures flow dynamics over gravel beds,offering a robust tool for hydraulic design and performance assessment of open channels. 展开更多
关键词 Friction factor Reynolds number gravel bed open channel VOF modelling
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The limits of electrical transport in thin GaN channels on N-polar AlN 认领 引用
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作者 Yoann Robin Itsuki Furuhashi Markus Pristovsek 《Journal of Semiconductors》 EI CAS CSCD 2026年第7期105-115,共11页
We have systematically studied the impact of thickness on the electrical properties of thin GaN channels on N-polar AlN(0001)templates grown on sapphire.The observed increase in sheet carrier density with increasing G... We have systematically studied the impact of thickness on the electrical properties of thin GaN channels on N-polar AlN(0001)templates grown on sapphire.The observed increase in sheet carrier density with increasing GaN thickness can be quantitatively reproduced by calculations assuming a Fermi-level pinning about 0.8 eV below the conduction band.The mobility strongly increases until 6 nm which correlates with reduced overlap of the 2DEG wave function with the surface layer.The mobility then increases more gradually up to 10 nm,corresponding to a reduced fraction of the 2DEG within the first 0.5 nm near the AlN/GaN interface,namely,the region affected by interface roughness.The mobility saturates at approximately400 cm2·V-1·s-1,probably limited by dislocations and the overlap with deep traps inside the AlN back barrier.If the GaN thickness exceeds 15 nm,the mobility decreases,likely due to the onset of gradual relaxation and appearance of misfit dislocations.Finally,we note that the temperature-dependent mobility exhibits an unexpected contribution proportional to T-2 for all GaN channels on N-polar AlN,including those reported in the literature.Such observation may be explained by a 50%higher effective mass of the electron,which amplify the electron-phonon scattering,ultimately limiting the room-temperature mobility to about 750 cm2·V-1·s-1 and confining the sheet resistivity to values above 200Ω/□. 展开更多
关键词 N-polar AlN MOCVD growth carrier scattering HEMT thin GaN channel
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Dimensionality-engineered electron channels for directional acceleration of 1,4-NADH-dependent photoenzymatic CO2-to-liquid fuels 认领 引用
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作者 Jinde Cai Xiuling Ji +4 位作者 Wanrong Dong Boxia Guo Hongguang Zhang Jinguang Hu Yuhong Huang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第4期522-532,I0013,共11页
Efficient and selective regeneration of enzymatically active 1,4-NADH from NAD+is pivotal for accelerating photoenzymatic CO2conversion.However,constructing photocatalysts that sustain continuous electron flow a... Efficient and selective regeneration of enzymatically active 1,4-NADH from NAD+is pivotal for accelerating photoenzymatic CO2conversion.However,constructing photocatalysts that sustain continuous electron flow and provide sufficient hydride supply remains a major challenge.Herein,we report a rhodium-coordinated three-dimensional conjugated polymer(3D-Bpy-Rh)photocatalyst featuring multiple electron channels,designed through dimensionality engineering and incorporation of hydride-forming active centers.Such a 3D structure promotes rapid charge separation and multidimensional electron migration,while facilitating trapped-electron release to Rh centers for accelerated electron transfer.As a result,3D-Bpy-Rh achieves a visible-light driven NADH regeneration efficiency of 90.8%with 99.2%selectivity toward 1,4-NADH,surpassing state-of-the-art photocatalysts.Furthermore,the mechanism between the electron reduction capability of the photocatalyst and the selective formation of 1,4-NADH was elucidated,combining transient absorption spectroscopy analysis and DFT calculations.When integrated into photoenzymatic systems,this photocatalyst enhances CO2conversion,boosting methanol and ethanol yields by 5.2-and 2.0-fold,respectively.These results highlighted the potential of dimensionality-engineered photocatalysts for selective 1,4-NADH regeneration and efficient photoenzymatic fuel synthesis. 展开更多
关键词 Conjugated polymers Dimensionality engineering Multiple electron channels Photoenzymatic CO2RR Liquid fuels
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Simulation Study on the Non-Uniform Characteristics of Boiling Flow and Heat Transfer in Parallel Small Channels 认领 引用
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作者 Chi Zhong Bo Ye +2 位作者 Xiao Wang Yang Liu Linmin Li 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第6期435-464,共30页
With the sharp increase in the heat flux of high-power electronic devices,efficient thermal management has become critically important.Boiling heat transfer in parallel small channels,which utilizes latent heat effici... With the sharp increase in the heat flux of high-power electronic devices,efficient thermal management has become critically important.Boiling heat transfer in parallel small channels,which utilizes latent heat efficiently,has emerged as a key enabling technology for next-generation cooling solutions.However,parallel channel systems are extremely susceptible to flow instabilities,resulting in severely uneven distributions of flow rate and heat transfer among the channels.This unevenness often leads to local overheating,which in turn restricts the system's reliability and limits its practical application.In this paper,a three-dimensional transient numerical simulation method was employed to investigate the non-uniform characteristics of flow boiling and heat transfer of Rl34a within parallel rectangular small channels.The differential characteristics of flow and heat transfer parameters among channels under varying mass flux and heat flux conditions were systematically investigated.The quantitative characterization methods for the degree of flow and heat transfer non-uniformity were proposed.Two quantitative characterization parameters,β1for flow non-uniformity andβ2for heat transfer non-uniformity,are proposed.Besides,the predictive correlations for the nonuniformity degrees of flow and heat transfer were constructed.Theβ1increases with increasing heat flux and decreases with increasing mass flux,whileβ2decreases with increasing heat flux and mass flux.When the mass flux is constant,β1decreases with increasingβ2,and the decreasing rate ofβ1is much lower than the increasing rate ofβ2.When the heat flux is constant,β1increases with increasingβ2,and the increasing rate ofβ1is much larger than the increasing rate ofβ2.β1andβ2obtained from simulations agree with the fitted predictions to within±20%.This paper has important theoretical guiding significance for optimizing the safe and stable operation of high heat flux cooling systems. 展开更多
关键词 Boiling flow parallel small channels non-uniform characteristics numerical simulation
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Carrier Frequency Offset Based Robust Radio Frequency Fingerprint for OFDM Communication in Time-Varying Channels 认领 引用
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作者 Liu Gengyi Pan Yijin +2 位作者 Wang Junbo Chen Yijian Yu Hongkang 《ZTE Communications》 2026年第1期25-33,共9页
The radio frequency(RF)fingerprint technique is a robust method for security enhancement of the physical layer by leveraging the unique RF imperfections inherent in various wireless devices.Among these imperfections,t... The radio frequency(RF)fingerprint technique is a robust method for security enhancement of the physical layer by leveraging the unique RF imperfections inherent in various wireless devices.Among these imperfections,the carrier frequency offset(CFO)stands out as a primary RF fingerprint(RFF)of the transmitter,offering the potential to distinguish among different transmitters.However,accurately estimating CFO in time-varying channels poses significant challenges due to multipath effects and Doppler shifts.In this paper,we focus on estimating CFO for wireless device identification in the orthogonal frequency division multiplexing(OFDM)communication system.To achieve precise CFO estimation under time-varying channels,we propose a frequency domain correlation and spline interpolation(FCSI)algorithm.This approach utilizes pilots distributed across different subcarriers to correlate with prior local sequences,facilitating accurate CFO estimation.Classification is then performed based on the Euclidean distance between the prior RFF and the tested RFF dataset.Simulation results demonstrate that the proposed Mconsecutive average method effectively reduces the classification error rate in the challenging high-frequency(HF)skywave channel environment. 展开更多
关键词 RF fingerprint RF identification carrier frequency offset time-varying channels OFDM
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Bi-Bi2Ti2O7 ohmic junction:Dual electron channels driving efficient photocatalytic nitrogen fixation 认领 引用
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作者 Pengkun Li Runjie Wu +5 位作者 Shuai Gao Zeping Qin Mingming Sun Changzheng Wang Wenming Sun Qiang Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第1期563-569,共7页
Photocatalysis uses solar energy to convert nitrogen and water directly into ammonia,helping reduce dependence on fossil fuels and offering a way to integrate the nitrogen cycle into a clean energy network.Ohmic junct... Photocatalysis uses solar energy to convert nitrogen and water directly into ammonia,helping reduce dependence on fossil fuels and offering a way to integrate the nitrogen cycle into a clean energy network.Ohmic junctions between metals and semiconductors have demonstrated significant advantages in enhancing stability and reducing carrier recombination,but their application in photocatalytic nitrogen fixation is limited due to the difficulty of work function matching and the complexity of fabrication processes.In this study,density functional theory(DFT) calculations were used to confirm the work function matching between Bi and Bi2Ti2O7(BTO),ensuring the formation of an Ohmic junction.A Bi-Bi2Ti2O7(B-BTO) composite was successfully synthesized via a one-step hydrothermal method,using bismuth nitrate and titanium sulfate as precursors.Compared to pure BTO,the B-BTO heterojunction,driven by dual electron injection from both metal Bi and BTO,significantly increased the ammonia synthesis rate to 686.95 μmol g-1h-1,making it the most active nitrogen fixation material among similar pyrochlorebased catalysts to date.The differential charge density calculations,photocurrent(i-t) measurements,and photoluminescence(PL) tests further validate the role of Ohmic contacts in enhancing charge transfer and prolonging carrier lifetimes.This research provides valuable insight into the application of Ohmic junctions in photocatalytic nitrogen fixation and contributes to advancements in this field. 展开更多
关键词 Photocatalytic N2fixation Ohmic junction Dual electron channels Bi2Ti2O7
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Design of Interleaved PAC Codes for Meteor Burst Channels 认领 引用
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作者 Wu Yunzhi Li Li Tang Xiaohu 《China Communications》 SCIE EI CSCD 2026年第5期31-43,共13页
Meteor burst channel demonstrates special fading characteristics,in which the statistics of channel envelope along the time domain explicitly violate the traditional iid(independent and identically distributed)assumpt... Meteor burst channel demonstrates special fading characteristics,in which the statistics of channel envelope along the time domain explicitly violate the traditional iid(independent and identically distributed)assumption.Because this kind of channel will rapidly disappear after its occurrence.In order to adapt to this particular characteristic of meteor burst channel,a noniid assumption based Gaussian approximation(GA)algorithm is employed to rebuild the state-of-the-art polarization adjusted convolutional(PAC)code.Then,the polarization effect under non-iid condition is analyzed and an interleaving method is employed to enhance the polarization efficiency.Compared with the widely used low density parity check(LDPC)codes and turbo product codes(TPC),our interleaved PAC codes are capable of decreasing the BLER level by one order of magnitude. 展开更多
关键词 interleaving meteor burst channel PAC codes
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Spectrum and functions of ion channels and transporters in osteoclasts 认领 引用
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作者 Hongyu Chen Yanli Zhang +3 位作者 Yulong Zhu Xiang Xiao Shanshan Huang Xiaohong Duan 《Bone Research》 SCIE CAS CSCD 2026年第2期447-477,共31页
Osteoclasts are essential for bone resorption and interact with osteoblasts during bone remodeling.Ion channels and transporters located in the ruffled border or intracellular vesicles coordinate the transport of vari... Osteoclasts are essential for bone resorption and interact with osteoblasts during bone remodeling.Ion channels and transporters located in the ruffled border or intracellular vesicles coordinate the transport of various ions and substrates,which is fundamental to the primary functions of osteoclasts.Numerous channels and transporters are implicated in bone metabolic disorders and genetic diseases.Among these,the voltage-gated chloride channel 7(ClC-7)and vacuolar proton ATPases(VATPase)represent the most well-characterized examples in osteoclasts. 展开更多
关键词 ruffled border channels transporters transporters intracellular vesicles bone resorption vacuolar proton atpases vatpase represent osteoclasts bone remodelingion
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On Distortion of Fading Channels without and with Channel Coding in Real-Time Wireless Systems 认领 引用
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作者 He Meilin Lei Yanchao +1 位作者 Wang Haiquan Pan Peng 《China Communications》 SCIE EI CSCD 2026年第6期103-117,共15页
With the rise of the internet of things demanding low latency,the significance of real-time transmission communications is being increasingly emphasized.In real-time transmission systems,there are two ways to do the t... With the rise of the internet of things demanding low latency,the significance of real-time transmission communications is being increasingly emphasized.In real-time transmission systems,there are two ways to do the transmission:without and with channel coding,and therefore,it is worth comparing the performance of these ways.In this paper,the distortions of these two systems are derived.Specifically,a general formula for calculating distortion in wireless communication systems is first provided.Next,variations of the formula are developed for three standard wireless communication systems:single-input,single-output(SISO);multiple-input,multiple-output(MIMO)with a Gaussian channel;and mmWave MIMO.Theoretical derivations,supported by simulation results,demonstrate that systems without channel coding exhibit less distortion than those with channel coding on average. 展开更多
关键词 average distortion channel coding realtime transmission
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