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A Comparative Review of the Experimental Mitigation Methods of the S-Shaped Diffusers in the Aeroengine Intakes 认领 引用
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作者 Hussain H.Al-Kayiem Safaa M.Ali +1 位作者 Sundus S.Al-Azawiey Raed A.Jessam 《Energy Engineering》 EI 2026年第2期68-103,共36页
Gas Turbines are among the most important energy systems for aviation and thermal-based power generation.The performance of gas turbine intakes with S-shaped diffusers is vulnerable to flow separation,reversal flow,an... Gas Turbines are among the most important energy systems for aviation and thermal-based power generation.The performance of gas turbine intakes with S-shaped diffusers is vulnerable to flow separation,reversal flow,and pressure distortion,mainly in aggressive S-shaped diffusers.Severalmethods,including vortex generators and energy promoters,have been proposed and investigated both experimentally and numerically.This paper compiles a review of experimental investigations that have been performed and reported to mitigate flow separation and restore system performance.The operational principles,classifications,design geometries,and performance parameters of Sshaped diffusers are presented to facilitate the analysis and understanding of the influence of each mitigation method on flowenhancement in S-shaped diffusers.Theinfluencing design parameters on the performance of the S-shaped diffuser and the findings achieved by various experimental investigations are discussed and compared.The review concludes that reducing the intake length reduces the size and weight of the gas turbine,leading to a higher power-to-weight ratio.However,the main challenge in shortening the S-shaped diffusers is the flow separation in the high-curvature section,which must be prevented to maintain high performance.Prevention can be achieved through flow control methods,which are categorized into passive and aggressive methods.The static pressure recovery coefficient,total pressure loss coefficient,ideal static pressure coefficient,distortion coefficient,and skin friction coefficient are the primary performance evaluation and comparison parameters between the experimentally investigated mitigation methods.The new trend in S-shaped diffuser studies includes the integration of computational and data-driven methods. 展开更多
关键词 Active flow control aeroengine air intake distortion coefficient gas turbine passive flow control pressure recovery S-shaped diffuser
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Thermocline performance in a molten salt thermocline energy storage tank with annular-arranged and cross-arranged diffusers 认领 引用 被引量：1
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作者 Zheming TONG Haidan WANG +2 位作者 Shuiguang TONG Qi YANG Taotao NIE 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2025年第4期339-358,共20页
The thermocline energy storage tank(TEST)serves as a crucial component in thermal energy storage systems,utilizing the working fluid that enters through a diffuser to store and harness energy.However,the conventional ... The thermocline energy storage tank(TEST)serves as a crucial component in thermal energy storage systems,utilizing the working fluid that enters through a diffuser to store and harness energy.However,the conventional double-plate radial diffuser is ill-suited for a single-medium TEST’s full tank storage due to its unidirectional fluid inflow.There has been a notable lack of optimization analysis of diffusers.Two innovative tubular diffuser designs with reduced cross-sectional areas have been introduced:the annular-arranged diffuser(AAD)and the cross-arranged diffuser(CAD).To elucidate the impact of diffuser designs on energy storage efficiency,a 3D transient computational fluid dynamics(CFD)model was established to simulate a thermocline formation under two diffuser types.The model was validated against experimental data.Results showed that the thermocline of AAD was 11.39%thinner than that of a traditional double-plate diffuser.In the process of charging and discharging,the time-varying thermocline and factors influencing thermocline thickness were analyzed.Results indicate that in the mixed dominant region,increased turbulent kinetic energy correlates with reduced thermocline thickness.Notably,the AAD’s stable thermocline was 4.23%and 5.41%thinner than the CAD’s during charging and discharging,respectively,making the AAD preferable for engineering applications.The effects of tube diameter and orifice opening angle on temperature stratification performance were also examined.The findings suggest that an inclined impact jet and large-diameter tubes are more conducive to temperature stratification.Moreover,an orifice diameter optimization method was developed,which can decrease the thermocline by 6.78%. 展开更多
关键词 Molten salt Thermocline Computational fluid dynamics(CFD) Diffuser Thermal energy storage
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基于Diffusers框架的电商产品图制作方法研究 认领 引用
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作者 伍海洋 马川越 刘登辉 《无线互联科技》 2024年第2期104-106,共3页
基于Diffusers框架与Control Net网络,文章开发并实现了服装产品图的制作流程,将Segment Anything与Grounding DINO结合,实现了自动分割衣服蒙版。将Semantic Segmentation与ViTmatte结合,实现了对皮肤的精细化分割。文章使用大模型的... 基于Diffusers框架与Control Net网络,文章开发并实现了服装产品图的制作流程,将Segment Anything与Grounding DINO结合,实现了自动分割衣服蒙版。将Semantic Segmentation与ViTmatte结合,实现了对皮肤的精细化分割。文章使用大模型的低秩适应实现了对图像风格的微调,利用Ultralytics框架,结合Diffusers提出了一种图像修复方法。将生成图与原图对比,实验结果表明:将Diffusers与Control Net网络结合,能够实现模特替换与背景替换,该方法可以为用户提供衣服上身的参考,降低商家的产品图制作成本。 展开更多
关键词 电商产品图 模特替换 Diffusers Control Net
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Experimental Research on Sewage Outfall Diffusers 认领 引用 被引量：13
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作者 Jiang Chuanfeng , Yan Zhongmin , Zhou Chuntian and Liu Mingming Professor, Res. Inst. of Water Resources and Hydro-Electric Power, Hohai University, Nanjing 210024 Senior Engineer, Res. Inst. of Water Resources and Hydro-Electric Power, Hohai University, Nanjing 210024 Engineer, Res. Inst. of Water Resources and Hydro-Electric Power, Hohai University, Nanjing 210024 《China Ocean Engineering》 SCIE EI 1995年第2期215-222,共8页
The influence of diffuser parameters, including the riser spacing, port number in a riser, injection angle, port arrangement, etc., on the surface initial dilution is experimentally investigated. The relative density ... The influence of diffuser parameters, including the riser spacing, port number in a riser, injection angle, port arrangement, etc., on the surface initial dilution is experimentally investigated. The relative density difference between the effluent and the sea water in the model is the same as that in the prototype, and the effect of the cross current is simulated by an inverse model technique. Based on the result analysis, the arrangement with more ports in a riser and larger riser spacing is suggested to save construction cost. The relationship between the Reynolds number based on the port diameter and velocity, and the surface initial dilution is also explored, and the critical Reynolds number is proposed. 展开更多
关键词 sewage diffuser model test
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Merging Effluent Discharge Plumes from Multiport Diffusers on a Sloping Beach 认领 引用 被引量：1
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作者 Anton Purnama 《Applied Mathematics》 2012年第1期24-29,共6页
Multiport diffusers are the effective engineering devices installed at the marine outfall systems for the steady discharge of effluent streams from the modern coastal plants, such as municipal sewage treatment, power ... Multiport diffusers are the effective engineering devices installed at the marine outfall systems for the steady discharge of effluent streams from the modern coastal plants, such as municipal sewage treatment, power generation and seawater desalination. A far field mathematical model using a two-dimensional advection-diffusion equation is presented for continuous discharges of effluent streams from multiple outfalls on a uniformly sloping beach with a current parallel to the shoreline. The analytical solutions are illustrated graphically to replicate and capture the merging process of effluent plumes in shallow coastal waters, and then asymptotic approximation will be made to the maximum shoreline’s concentration to formulate effluent discharge plume dilution from a multiport diffuser. 展开更多
关键词 Effluent Discharge Mathematical Model Multiple Outfalls Multiport Diffuser Sloping Beach
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Effect of Different Incoming Flow Conditions on the Performance of Axial Flow Diffusers Used for the Jet Engine 认领 引用
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作者 LI Litao LI Ziliang +2 位作者 WU Yanhui ZHANG Haoguang CHU Wuli 《Journal of Thermal Science》 SCIE EI CAS CSCD 2026年第4期1219-1233,共15页
Axial flow diffuser,which is located downstream of the axial compressor in the jet engine,is always regarded as a part of the combustor component.The diffuser performance is shown to be greatly influenced by the incom... Axial flow diffuser,which is located downstream of the axial compressor in the jet engine,is always regarded as a part of the combustor component.The diffuser performance is shown to be greatly influenced by the incoming flow conditions.However,due to the independent design modules of combustor and compressor,simplified incoming flow conditions(SIFC,circumferential averaged flow parameters)are commonly used in the combustor design.Moreover few researchers have noticed the effect of accurate incoming flow conditions(AIFC,actual compressor outlet flow parameters)on the performance of the diffuser and combustor.This oversight frequently leads to unnecessary diffuser design deviations.In this paper,a 2.5-stage high-load axial compressor coupled with the downstream diffuser is numerically investigated to clarify the effect of SIFC and AIFC on the diffuser performance.The results show significant performance difference of the diffuser with the two inflow condition treatment methods,where the diffuser with AIFC presents an approximately five times higher of total pressure loss coefficient(Cp,t)than that of the SIFC(i.e.Cp,t,SIFC=0.326%(hub divergence angleα=14°)VS Cp,t,AIFC=1.61%(hub divergence angleα=7°)at the compressor peak efficiency point),and the optimal divergence angle distribution on the shroud and hub of diffuser with the SIFC and AIFC also shows a great deviation(αOPT,AIFC=7°VSαOPT,SIFC=14°).The greater mixing intensity is manifested in the diffuser flow under AIFC due to its circumferential upstream non-uniformity characteristics such as blade wake,which not only increases flow losses but also facilitates flow deceleration.As the compressor operates from peak efficiency point to near stall point,the total pressure loss and static pressure recovery ability of the diffuser under AIFC present more sensitive to the variations of diffuser wall divergence angle distribution.Therefore,for the purpose of improving the design art of axial flow diffuser used for aero gas turbine,the integrated consideration of diffuser and its upstream compressor is recommended due to the accurate flow conditions. 展开更多
关键词 axial flow diffuser axial compressor flow condition aerodynamic performance jet engine
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Generative Semantic Communication:Architectures,Technologies,and Applications 认领 引用 被引量：4
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作者 Jinke Ren Yaping Sun +7 位作者 Hongyang Du Weiwen Yuan Chongjie Wang Xianda Wang Yingbin Zhou Ziwei Zhu Fangxin Wang Shuguang Cui 《Engineering》 SCIE EI CSCD 2026年第1期45-61,共17页
Semantic communication(SemCom)has emerged as a transformative paradigm for future wireless networks,aiming to improve communication efficiency by transmitting only the semantic meaning(or its encoded version)of the so... Semantic communication(SemCom)has emerged as a transformative paradigm for future wireless networks,aiming to improve communication efficiency by transmitting only the semantic meaning(or its encoded version)of the source data rather than the complete set of bits(symbols).However,traditional deep-learning-based SemCom systems present challenges such as limited generalization,low robustness,and inadequate reasoning capabilities,primarily due to the inherently discriminative nature of deep neural networks.To address these limitations,generative artificial intelligence(GAI)is seen as a promising solution,offering notable advantages in learning complex data distributions,transforming data between high-and low-dimensional spaces,and generating high-quality content.This paper explores the applications of GAI in SemCom and presents a comprehensive study.It begins by introducing three widely used SemCom systems enabled by classical GAI models:variational autoencoders,generative adversarial networks,and diffusion models.For each system,the fundamental concept of the GAI model,the corresponding SemCom architecture,and a literature review of recent developments are provided.Subsequently,a novel generative SemCom system is proposed,incorporating cutting-edge GAI technology—large language models(LLMs).This system features LLM-based artificial intelligence(AI)agents at both the transmitter and receiver,which act as“brains”to enable advanced information understanding and content regeneration capabilities,respectively.Unlike traditional systems that focus on bitstream recovery,this design allows the receiver to directly generate the desired content from the coded semantic information sent by the transmitter.As a result,the communication paradigm shifts from“information recovery”to“information regeneration,”marking a new era in generative SemCom.A case study on point-to-point video retrieval is presented to demonstrate the effectiveness of the proposed system,showing a 99.98%reduction in communication overhead and a 53%improvement in average retrieval accuracy compared to traditional communication systems.Furthermore,four typical application scenarios for generative SemCom are described,followed by a discussion of three open issues for future research.In summary,this paper provides a comprehensive set of guidelines for applying GAI in SemCom,laying the groundwork for the efficient deployment of generative SemCom in future wireless networks. 展开更多
关键词 Semantic communication Generative artificial intelligence Large language model Variational autoencoder Generative adversarial network Diffusion model
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Revealing the Hydrogen Permeation Mechanism in Polyetheretherketone and Polytetrafluoroethylene:From Experimental Validation to Molecular-level Interpretation 认领 引用 被引量：1
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作者 Hong-Lin Zhang Wen-Tao Hu +2 位作者 Jie Xiao Tian-Lei Li Yuan-Hua Lin 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第1期278-298,I0019,共21页
This study integrates experimental investigation with molecular dynamics simulations to elucidate the hydrogen transport mechanisms in polyetheretherketone(PEEK)and polytetrafluoroethylene(PTFE),offering fundamental i... This study integrates experimental investigation with molecular dynamics simulations to elucidate the hydrogen transport mechanisms in polyetheretherketone(PEEK)and polytetrafluoroethylene(PTFE),offering fundamental insights into the barrier properties of high-performance polymeric materials.Experimental results demonstrate that PEEK exhibits superior hydrogen barrier performance compared to PTFE at both ambient and elevated temperatures.However,detailed molecular dynamics simulations uncover a distinctive,enthalpy-driven"high solubility-low diffusivity"transport mechanism:although PEEK displays higher hydrogen solubility due to its stronger thermodynamic affinity,its diffusion coefficient is markedly lower than that of PTFE.This mechanism remains operative across a broad operational temperature range(233 K to358 K),yet its influence on overall permeability is strongly temperature-dependent.At room and high temperatures,the exceptionally low diffusivity of PEEK governs the entire permeation process,establishing its effectiveness as a high-performance hydrogen barrier material.In contrast,under low-temperature conditions(e.g.,233 K),the general suppression of diffusion allows the high solubility of PEEK to dominate,resulting in greater overall permeability than PTFE and giving rise to a performance“reversal”phenomenon.This distinct transport behavior originates from the strong non-covalent interactions between hydrogen molecules and the aromatic rings as well as polar functional groups present in the amorphous regions of PEEK,which simultaneously enhance solubility and impose significant kinetic energy barriers.The"structure-mechanism"correlation framework established in this work provides a robust theoretical foundation for the rational design of next-generation hydrogen barrier materials tailored to specific operational temperature requirements. 展开更多
关键词 Hydrogen permeation Polytetrafluoroethylene/polyetheretherketone Molecular dynamics simulation High solubility-low diffusivity
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Magnetic resonance imaging tracing of superparamagnetic iron oxide nanoparticle-labeled mesenchymal stromal cells for repairing spinal cord injury 认领 引用 被引量：1
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作者 Xiaoli Mai Yuanyuan Xie +12 位作者 Zhichong Wu Junting Zou Jiacheng Du Yunpeng Shen Hao Liu Bo Chen Mengxia Zhu Jiong Shi Yang Chen Bing Zhang Zezhang Zhu Bin Wang Ning Gu 《Neural Regeneration Research》 SCIE CAS CSCD 2026年第5期2031-2039,共9页
Mesenchymal stromal cell transplantation is an effective and promising approach for treating various systemic and diffuse diseases.However,the biological characteristics of transplanted mesenchymal stromal cells in hu... Mesenchymal stromal cell transplantation is an effective and promising approach for treating various systemic and diffuse diseases.However,the biological characteristics of transplanted mesenchymal stromal cells in humans remain unclear,including cell viability,distribution,migration,and fate.Conventional cell tracing methods cannot be used in the clinic.The use of superparamagnetic iron oxide nanoparticles as contrast agents allows for the observation of transplanted cells using magnetic resonance imaging.In 2016,the National Medical Products Administration of China approved a new superparamagnetic iron oxide nanoparticle,Ruicun,for use as a contrast agent in clinical trials.In the present study,an acute hemi-transection spinal cord injury model was established in beagle dogs.The injury was then treated by transplantation of Ruicun-labeled mesenchymal stromal cells.The results indicated that Ruicunlabeled mesenchymal stromal cells repaired damaged spinal cord fibers and partially restored neurological function in animals with acute spinal cord injury.T2*-weighted imaging revealed low signal areas on both sides of the injured spinal cord.The results of quantitative susceptibility mapping with ultrashort echo time sequences indicated that Ruicun-labeled mesenchymal stromal cells persisted stably within the injured spinal cord for over 4 weeks.These findings suggest that magnetic resonance imaging has the potential to effectively track the migration of Ruicun-labeled mesenchymal stromal cells and assess their ability to repair spinal cord injury. 展开更多
关键词 acute spinal cord injury diffusion tensor imaging dynamic migration mesenchymal stromal cells neural function neuronal regeneration quantitative susceptibility mapping repairability ruicun superparamagnetic iron oxide nanoparticle
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Optical information transfer through random unknown diffusers using electronic encoding and diffractive decoding 认领 引用 被引量：11
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作者 Yuhang Li Tianyi Gan +3 位作者 Bijie Bai Cagatay Isıl Mona Jarrahi Aydogan Ozcan 《Advanced Photonics》 SCIE EI CAS CSCD 2023年第4期85-99,共15页
Free-space optical information transfer through diffusive media is critical in many applications, such as biomedical devices and optical communication, but remains challenging due to random, unknown perturbations in t... Free-space optical information transfer through diffusive media is critical in many applications, such as biomedical devices and optical communication, but remains challenging due to random, unknown perturbations in the optical path. We demonstrate an optical diffractive decoder with electronic encoding to accurately transfer the optical information of interest, corresponding to, e.g., any arbitrary input object or message, through unknown random phase diffusers along the optical path. This hybrid electronic-optical model, trained using supervised learning, comprises a convolutional neural network-based electronic encoder and successive passive diffractive layers that are jointly optimized. After their joint training using deep learning,our hybrid model can transfer optical information through unknown phase diffusers, demonstrating generalization to new random diffusers never seen before. The resulting electronic-encoder and optical-decoder model was experimentally validated using a 3D-printed diffractive network that axially spans <70λ, whereλ = 0.75 mm is the illumination wavelength in the terahertz spectrum, carrying the desired optical information through random unknown diffusers. The presented framework can be physically scaled to operate at different parts of the electromagnetic spectrum, without retraining its components, and would offer low-power and compact solutions for optical information transfer in free space through unknown random diffusive media. 展开更多
关键词 optical information transfer electronic encoding optical decoder diffractive neural network diffusers
Computational imaging without a computer:seeing through random diffusers at the speed of light 认领 引用 被引量：71
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作者 Yi Luo Yifan Zhao +4 位作者 Jingxi Li Ege Çetintaş Yair Rivenson Mona Jarrahi Aydogan Ozcan 《eLight》 2022年第1期42-57,共16页
Imaging through diffusers presents a challenging problem with various digital image reconstruction solutions demonstrated to date using computers.Here,we present a computer-free,all-optical image reconstruction method... Imaging through diffusers presents a challenging problem with various digital image reconstruction solutions demonstrated to date using computers.Here,we present a computer-free,all-optical image reconstruction method to see through random diffusers at the speed of light.Using deep learning,a set of transmissive diffractive surfaces are trained to all-optically reconstruct images of arbitrary objects that are completely covered by unknown,random phase diffusers.After the training stage,which is a one-time effort,the resulting diffractive surfaces are fabricated and form a passive optical network that is physically positioned between the unknown object and the image plane to all-optically reconstruct the object pattern through an unknown,new phase diffuser.We experimentally demonstrated this concept using coherent THz illumination and all-optically reconstructed objects distorted by unknown,random diffusers,never used during training.Unlike digital methods,all-optical diffractive reconstructions do not require power except for the illumination light.This diffractive solution to see through diffusers can be extended to other wavelengths,and might fuel various applications in biomedical imaging,astronomy,atmospheric sciences,oceanography,security,robotics,autonomous vehicles,among many others. 展开更多
关键词 Imaging through diffusers Computational imaging Diffractive neural network Deep learning
Inverse Design of Composite Materials Based on Latent Space and Bayesian Optimization 认领 引用 被引量：1
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作者 Xianrui Lyu Xiaodan Ren 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第1期1-25,共25页
Inverse design of advanced materials represents a pivotal challenge in materials science.Leveraging the latent space of Variational Autoencoders(VAEs)for material optimization has emerged as a significant advancement ... Inverse design of advanced materials represents a pivotal challenge in materials science.Leveraging the latent space of Variational Autoencoders(VAEs)for material optimization has emerged as a significant advancement in the field of material inverse design.However,VAEs are inherently prone to generating blurred images,posing challenges for precise inverse design and microstructure manufacturing.While increasing the dimensionality of the VAE latent space can mitigate reconstruction blurriness to some extent,it simultaneously imposes a substantial burden on target optimization due to an excessively high search space.To address these limitations,this study adopts a Variational Autoencoder guided Conditional Diffusion Generative Model(VAE-CDGM)framework integrated with Bayesian optimization to achieve the inverse design of composite materials with targeted mechanical properties.The VAE-CDGM model synergizes the strengths of VAEs and Denoising Diffusion Probabilistic Models(DDPM),enabling the generation of high-quality,sharp images while preserving a manipulable latent space.To accommodate varying dimensional requirements of the latent space,two optimization strategies are proposed.When the latent space dimensionality is excessively high,SHapley Additive exPlanations(SHAP)sensitivity analysis is employed to identify critical latent features for optimization within a reduced subspace.Conversely,direct optimization is performed in the low-dimensional latent space of VAE-CDGM when dimensionality is modest.The results demonstrate that both strategies accurately achieve the targeted design of composite materials while circumventing the blurred reconstruction flaws of VAEs,which offers a novel pathway for the precise design of advanced materials. 展开更多
关键词 Variational autoencoder denoising diffusion generation model composite materials Bayesian opti-mization SHapley Additive exPlanations
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Unveiling the potential of helium enrichment in shale reservoirs:A molecular and experimental perspective 认领 引用
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作者 Shuangshuang Lin Xin Chang +2 位作者 Yue Yu Chunhe Yang Yintong Guo 《International Journal of Coal Science & Technology》 SCIE EI CAS CSCD 2026年第2期137-156,共20页
Helium-bearing shale reservoirs are gaining attention as unconventional strategic resources,yet the fundamental mechanisms governing helium occurrence and migration remain poorly resolved.In this study,we integrate hi... Helium-bearing shale reservoirs are gaining attention as unconventional strategic resources,yet the fundamental mechanisms governing helium occurrence and migration remain poorly resolved.In this study,we integrate high-pressure adsorption–diffusion experiments(308 K,1300 psi)with molecular simulations under reservoir-relevant conditions(70 MPa,403–423 K)to investigate helium behavior in organic-rich shale.Results show that during CH4–He co-adsorption,methane preferentially occupies adsorption sites,thereby reducing the adsorption capacity of helium.Meanwhile,molecular simulations indicate that methane enhances helium’s near-wall residence(adsorption-layer fraction)through confinement and steric hindrance within nanopores.In this stage,varying helium concentration from 0.05%to 5%yields a limited impact on the overall diffusion coefficient.However,during desorption,helium shows a sharp mobility enhancement,and the diffusion coefficient increases from 0.3×10 to 17×10−12m2/s.This increase is attributed to methane evacuation and weak helium binding.Interaction energy analysis reveals that clay minerals dominate helium retention,and increasing methane content strongly non-linear enhances He–shale interactions as helium concentration decreases from 100%to 5%.These findings clarify helium’s occurrence state and its competitive dynamics with methane,offering molecular-level insights into the potential for helium preservation and co-production in CH4-rich shale systems. 展开更多
关键词 He Diffusion coefficient Experiments and simulations Molecular dynamics Diffusion mechanism
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Evans syndrome following influenza A presenting with diffuse alveolar hemorrhage managed with extracorporeal membrane oxygenation 认领 引用
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作者 Haotian Lu Anke Shi +3 位作者 Jieqiong Yu Jing Zhao Guoqiang Zhang Shengtao Yan 《World Journal of Emergency Medicine》 SCIE CAS CSCD 2026年第4期382-384,共3页
Diffuse alveolar hemorrhage(DAH)is a lifethreatening clinical condition characterized by bleeding into alveolar spaces,resulting in diffuse pulmonary infiltrates,hemoptysis,and hypoxemic respiratory failure.The etiolo... Diffuse alveolar hemorrhage(DAH)is a lifethreatening clinical condition characterized by bleeding into alveolar spaces,resulting in diffuse pulmonary infiltrates,hemoptysis,and hypoxemic respiratory failure.The etiologies of DAH include,but are not limited to,hematologic abnormalities(e.g.,thrombocytopenia and coagulopathies),autoimmune diseases(e.g.,vasculitis and systemic lupus erythematosus),and toxic or drug-induced lung injury. 展开更多
关键词 Diffuse alveolar hemorrhage diffuse alveolar hemorrhage dah hypoxemic respiratory failurethe systemic lupus erythematosus bleeding alveolar spacesresulting diffuse pulmonary infiltrateshemoptysisand Extracorporeal membrane oxygenation Evans syndrome
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The melting transformation mechanism of corundum and mullite in coal ash under reducing atmosphere 认领 引用
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作者 Baoliang Xia Facun Jiao +3 位作者 Yi Cheng Lirui Mao Jian Wang Hanxu Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2026年第5期203-214,共12页
Si/Al-rich coal ash tends to generate refractory minerals during gasification,leading to elevated ash fusion temperatures(AFTs)and viscosity.This increases the risk of slagging in entrained-flow gasifiers.Previous stu... Si/Al-rich coal ash tends to generate refractory minerals during gasification,leading to elevated ash fusion temperatures(AFTs)and viscosity.This increases the risk of slagging in entrained-flow gasifiers.Previous studies have reported that the regulation mechanism of high-alumina coal(HAC)by low-AFT coal and transformation of corundum and mullite into eutectic are key factors in improving ash fusibility.However,coal ash has a complex composition,and other components of HAC may affect the melting transformation paths of minerals.In this study,high-purity corundum and mullite were introduced into ash,and the changes during the heating process of coal ash with minerals were investigated.The melting behaviour of two minerals and their impact on the melt structure at high temperature were examined to explain the effect of the two minerals on ash fusibility.The results indicate that increasing the corundum residue in the coal ash,leading to elevated AFTs.Variations in the corundum residue were closely related to the transformation paths of the two minerals during melting.Mullite decomposed into the planar laminar structure(Q3)of Si-O network structures during instantaneous heating.The Q3 species migrated into the coal ash melt,increasing the Al concentration gradient between the liquid phase and corundum derived from mullite;by contrast,the added corundum developed a boundary layer upon corrosion by the molten phase,reducing the Al concentration gradient in solid—liquid phases and increasing the decomposition time of corundum.The interaction between the mineral and liquid phases in coal ash formed a corundum-containing suspension during the melting process,thereby increasing the AFT of ash.Therefore,promoting mullite formation instead of corundum in HAC helps lower AFT for gasification. 展开更多
关键词 Refractory mineral Coal ash Fusibility Diffusion Crystallization Reaction
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A Kind of Fast Iterative Methods With the Application Based on Diagonal Matrix Splitting 认领 引用 被引量：1
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作者 XU Qiuyan 《宁夏大学学报（自然科学版中英文）》 CAS 2026年第1期1-13,共13页
The fast solution of linear equations has always been one of the hot spots in scientific computing.A kind of the diagonal matrix splitting iteration methods are provided,which is different from the classical matrix sp... The fast solution of linear equations has always been one of the hot spots in scientific computing.A kind of the diagonal matrix splitting iteration methods are provided,which is different from the classical matrix splitting methods.Taking the decomposition of the diagonal elements for coefficient matrix as the key point,some new preconditioners are constructed.Taking the tri-diagonal coefficient matrix as an example,the convergence domains and optimal relaxation factor of the new method are analyzed theoretically.The presented new iteration methods are applied to solve linear algebraic equations,even 2D and 3D diffusion problems with the fully implicit discretization.The results of numerical experiments are matched with the theoretical analysis,and show that the iteration numbers are reduced greatly.The superiorities of presented iteration methods exceed some classical iteration methods dramatically. 展开更多
关键词 iteration matrix splitting diffusion equation convergence optimal relaxation factor
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Coalescence-Ripening Mechanism of γ′-Ni3(Al,Ti)During Long-Term/High-Temperature Operation of Ni-Based Superalloy Discs 认领 引用
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作者 Zhaotian Wang Yongquan Ning +3 位作者 Bingchao Xie Xiaoguang Fan Mei Zhan Mingwang Fu 《Rare Metals》 SCIE EI CAS CSCD 2026年第3期329-343,共15页
The evolution of the γ'-Ni3(Al,Ti)phase in superalloys is governed by a coupled coalescence-ripening mechanism driven by elemental diffusion.In this study,thermal exposure experiments were performed at 750℃an... The evolution of the γ'-Ni3(Al,Ti)phase in superalloys is governed by a coupled coalescence-ripening mechanism driven by elemental diffusion.In this study,thermal exposure experiments were performed at 750℃and 800℃for durations ranging from 100 to 20,000 h.The γ'phase underwent coalescence-ripening,with its morphology evolving from small spherical particles to elliptical and finally to large spherical particles.During this process,high chemical potential gradients were observed around small-diameter γ'phases and at the long-axis ends of elliptical γ'phases.These gradients drove the dissolution of smaller γ'phases by larger ones and the evolution of elliptical γ'into spherical ones.Concurrently,the Ni/(Al+Ti)ratio in the γ'phase decreased from 3.26 to 3.02 during exposure at 800℃.High-resolution scanning transmission electron microscopy(HR-STEM)analysis revealed complex atomic arrangements at the γ/γ'interface and the dislocation,featuring variations in interplanar distance and abundant edge dislocations,which serve as efficient pathways for atomic diffusion.Moreover,as the γ'phase coarsened,the γ/γ'interfaces remained coherent,with the lattice mismatch gradually approaching zero.Geometric phase analysis(GPA)indicated a significant relaxation of elastic strain at these interfaces.Based on the change in Al concentration at the γ/γ'interfaces,the interfacial energy decreased by approximately 3 times between 100 and 20,000 h of exposure at 800℃.This study provides foundational insights for a deeper understanding of elemental diffusion mechanisms in superalloys. 展开更多
关键词 γ'phase coalescence-ripening elemental diffusion energy nickel-based superalloy
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Nanodot-heterostructure-engineered cathode-electrolyte interphase for stable lithium-rich manganese-based oxide cathodes 认领 引用
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作者 Xu Xue Chenchen Li +5 位作者 Shengnan He Liaona She Fulai Qi Zhijun Wu Mingxia Gao Hongge Pan 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第2期136-145,I0005,共10页
High-voltage Li-rich Mn-based oxide(LRMO)cathodes are promising for breaking through the energy density limits of lithium-ion batteries,yet their practical application remains limited by electrochemical performance de... High-voltage Li-rich Mn-based oxide(LRMO)cathodes are promising for breaking through the energy density limits of lithium-ion batteries,yet their practical application remains limited by electrochemical performance degradation caused by unstable cathode-electrolyte interphase(CEI)evolution during longterm cycling.To address this issue,we propose a novel surface modification strategy using La0.7Sr0.3MnO3-σ(LSMO)nanodots,which exhibit high electronic co nductivity and excellent corrosion resistance.These nanodots act as stable anchoring sites,facilitating the formation of a robust CEI on LRMO,The LSMOmodified cathode demonstrates significantly improved anionic redox reversibility,effectively mitigating transition metal migration and lattice oxygen loss.Furthermore,the optimized interfacial electrochemical kinetics ensure sustained rapid Li+diffusion throughout cycling,while the formation of a stable trilayer CEI structure suppresses electrolyte decomposition.Benefiting from these synergistic effects,the LSMO nanodot-engineered LRMO cathode delivers outstanding cycling stability,retaining 97.4%capacity after 300 cycles at 1 C.This work not only highlights the critical role of nanodot heterostructures in stabilizing CEI but also provides a new approach to designing high-voltage cathodes with superior interfacial compatibility and long-term durability. 展开更多
关键词 Lithium-rich cathode Cathode-electrolyte interphase Heterostructures Diffusion kinetics High voltage
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In situ self-generation and joint strengthening mechanisms of low melting point layered Mg-Zn filler 认领 引用
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作者 Rui-nan Chen Kun-kun Deng +4 位作者 Yu-man Zhu Cui-ju Wang Kai-bo Nie Quan-xin Shi Yi-jia Li 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第6期431-445,共15页
Brazing of magnesium(Mg)alloys is critical for lightweight structural application,but the inherent brittleness of intermetallic compounds(IMCs)formed in conventional Mg alloy fillers severely limits joint reliability ... Brazing of magnesium(Mg)alloys is critical for lightweight structural application,but the inherent brittleness of intermetallic compounds(IMCs)formed in conventional Mg alloy fillers severely limits joint reliability and precision.In this work,a novel in situ self-generating Mg-Zn filler was developed through rolling compounding and diffusion reactions to enable low-temperature precision brazing.The filler significantly enhances joint performance,achieving a maximum shear strength of 54.6 MPa.This exceptional strength originates from the formation of anα-Mg/Mg7Zn3(MgZn2)soft-hard biphasic heterostructure during brazing solidification.The ductileα-Mg phase effectively blunts crack tips,suppresses crack propagation,and relieves stress concentration in the hard-brittle Mg7Zn3(MgZn2)phases,improving overall toughness and reliability.Meanwhile,rapid Zn diffusion during brazing induces atomic size mismatch within theα-Mg matrix,generating lattice distortion and dislocation proliferation.These structural defects lower the nucleation barrier of IMCs and promote the formation and localized melting of Mg7Zn3,which triggers gradient melting of the filler and enables effective low-temperature joining.This work provides a new filler design strategy and theoretical insights for advancing precision brazing of lightweight Mg alloys. 展开更多
关键词 Magnesium alloy Brazing Intermetallic compound Diffusion reaction Fracture behavior.
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Effect of carbon on recrystallization and grain growth behavior of carbide-free FeMnCoNiCx high-entropy alloys 认领 引用
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作者 Chang LIU Zhe JIANG +5 位作者 Wei FANG Hao-yang YU Jin-fei ZHANG Tie-xu PENG Xin ZHANG Fu-xing YIN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第5期1610-1622,共13页
The impact of interstitial carbon on recrystallization behavior was investigated in designed carbide-free FeMnCoNiCx high-entropy alloys(HEAs)by utilizing weak carbide-forming elements.The results indicate that rec... The impact of interstitial carbon on recrystallization behavior was investigated in designed carbide-free FeMnCoNiCx high-entropy alloys(HEAs)by utilizing weak carbide-forming elements.The results indicate that recrystallization and grain growth are both effectively facilitated in carbon-containing high-entropy alloys.Under identical cold rolling conditions,carbon-containing HEAs exhibit higher dislocation density and deformation stored energy,which facilitates the recrystallization behavior.Meanwhile,the activation energy for grain growth in carbon-containing alloys is lower than that in carbon-free alloys.Diffusion couple experiments reveal that the addition of carbon increases the diffusion coefficients of metallic elements,thereby reducing the activation energy for grain growth and consequently accelerating grain coarsening.This phenomenon stands in sharp contrast to the conventional understanding,in which carbon suppresses recrystallization by forming carbide secondary phases that pin grain boundaries. 展开更多
关键词 high-entropy alloy interstitial carbon cold rolling deformation recrystallization grain growth diffusion
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