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Multi-scale feature fused stacked autoencoder and its application for soft sensor modeling 认领 引用 被引量：3
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作者 Zhi Li Yuchong Xia +2 位作者 Jian Long Chensheng Liu Longfei Zhang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第5期241-254,共14页
Deep Learning has been widely used to model soft sensors in modern industrial processes with nonlinear variables and uncertainty.Due to the outstanding ability for high-level feature extraction,stacked autoencoder(SAE... Deep Learning has been widely used to model soft sensors in modern industrial processes with nonlinear variables and uncertainty.Due to the outstanding ability for high-level feature extraction,stacked autoencoder(SAE)has been widely used to improve the model accuracy of soft sensors.However,with the increase of network layers,SAE may encounter serious information loss issues,which affect the modeling performance of soft sensors.Besides,there are typically very few labeled samples in the data set,which brings challenges to traditional neural networks to solve.In this paper,a multi-scale feature fused stacked autoencoder(MFF-SAE)is suggested for feature representation related to hierarchical output,where stacked autoencoder,mutual information(MI)and multi-scale feature fusion(MFF)strategies are integrated.Based on correlation analysis between output and input variables,critical hidden variables are extracted from the original variables in each autoencoder's input layer,which are correspondingly given varying weights.Besides,an integration strategy based on multi-scale feature fusion is adopted to mitigate the impact of information loss with the deepening of the network layers.Then,the MFF-SAE method is designed and stacked to form deep networks.Two practical industrial processes are utilized to evaluate the performance of MFF-SAE.Results from simulations indicate that in comparison to other cutting-edge techniques,the proposed method may considerably enhance the accuracy of soft sensor modeling,where the suggested method reduces the root mean square error(RMSE)by 71.8%,17.1%and 64.7%,15.1%,respectively. 展开更多
关键词 Multi-scale feature fusion Soft sensors Stacked autoencoders Computational chemistry Chemical processes Parameter estimation
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Comparative effects of selenium-enriched lactobacilli and selenium-enriched yeast on performance,egg selenium enrichment,antioxidant capacity,and ileal microbiota in laying hens 认领 引用 被引量：2
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作者 Jianmin Zhou Uchechukwu Edna Obianwuna +6 位作者 Longfei Zhang Yongli Liu Haijun Zhang Kai Qiu Jing Wang Guanghai Qi Shugeng Wu 《Journal of Animal Science and Biotechnology》 SCIE CAS CSCD 2025年第3期1399-1415,共17页
Background Organic selenium(Se)has gained recognition in poultry nutrition as a feed additive to boost production and Se deposition in eggs and tissues,owing to its high bioavailability,efficient tissue accumulation a... Background Organic selenium(Se)has gained recognition in poultry nutrition as a feed additive to boost production and Se deposition in eggs and tissues,owing to its high bioavailability,efficient tissue accumulation and minimal toxicity.Selenium-enriched yeast(SeY)is a well-established source,while selenium-enriched lactobacilli(SeL),a newer alternative,offers the added benefits of probiotics.This study examined the effects of SeY and SeL on egg quality,antioxidant capacity,Se deposition,and gut health in laying hens.After a two-week pre-treatment with a Sedeficient diet(SeD),450 Hy-Line Brown laying hens(30-week-old)were assigned into five dietary groups with six replicates of 15 hens each.The groups included a SeD,SeD supplemented with 1.5 mg Se/kg from SeY(SeY15),or 1.5,3.0,and 6.0 mg Se/kg from SeL(SeL15,SeL30,SeL60).The feeding trial lasted for 12 weeks.Results SeY15 and SeL15 improved the feed-to-egg ratio(P<0.05)in the latter stages.Haugh units were significantly increased(P<0.05)in the SeY15 and SeL30 groups,while darker yolk color(P<0.05)was observed in the SeY15,SeL15,and SeL60 groups.All Se-supplemented diets increased Se content in whole eggs,albumen,and yolk(P<0.05),while SeL groups showed a dose-dependent effect.Antioxidant enzyme activities increased,and MDA content decreased in the serum(P<0.05),with SeY15 showing the highest GSH-Px levels(P<0.05).SeL60 increased serum alkaline phosphatase and aspartate transaminase,and distorted the liver architecture(P<0.05).Se-diets reduced concentrations of reactive oxygen species(ROS)in the ileum and liver(P<0.05).SeL15 improved the ileal villus height-tocrypt depth ratio(P<0.05).SeY15 and/or SeL15 up-regulated TXNRD1 and SEPHS1 mRNA while down-regulating SCLY expression in the liver.SeY15 altered ileal microbiota by increasing both beneficial and pathogenic bacteria,whereas SeL15 predominantly boosted beneficial bacteria.Conclusion SeL integrates the antioxidant properties of organic Se with the probiotic benefits on gut health,resulting in a performance-enhancing effect comparable to that of SeY.However,high SeL level(6.0 mg Se/kg)compromised productivity and metabolic functions while enhancing Se deposition. 展开更多
关键词 Antioxidant capacity Egg selenium Feed efficiency Gut microbiota Laying hen Selenium-enriched lactobacilli Selenium-enriched yeast
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Interpretable Fault Diagnosis for Liquid Rocket Engines via Component-Wise MLP-Based Granger Causality Feature Extraction 认领 引用 被引量：1
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作者 Longfei Zhang Zhi Zhai +3 位作者 Chenxi Wang Meng Ma Jinxin Liu Chunmin Wang 《Journal of Dynamics, Monitoring and Diagnostics》 2025年第3期203-212,共10页
Liquid rocket engine(LRE)fault diagnosis is critical for successful space launch missions,enabling timely avoidance of safety hazards,while accurate post-failure analysis prevents subsequent economic losses.However,th... Liquid rocket engine(LRE)fault diagnosis is critical for successful space launch missions,enabling timely avoidance of safety hazards,while accurate post-failure analysis prevents subsequent economic losses.However,the complexity of LRE systems and the“black-box”nature of current deep learning-based diagnostic methods hinder interpretable fault diagnosis.This paper establishes Granger causality(GC)extraction-based component-wise multi-layer perceptron(GCMLP),achieving high fault diagnosis accuracy while leveraging GC to enhance diagnostic interpretability.First,component-wise MLP networks are constructed for distinct LRE variables to extract inter-variable GC relationships.Second,dedicated predictors are designed for each variable,leveraging historical data and GC relationships to forecast future states,thereby ensuring GC reliability.Finally,the extracted GC features are utilized for fault classification,guaranteeing feature discriminability and diagnosis accuracy.This study simulates six critical fault modes in LRE using Simulink.Based on the generated simulation data,GCMLP demonstrates superior fault localization accuracy compared to benchmark methods,validating its efficacy and robustness. 展开更多
关键词 fault diagnosis Granger causality interpretability liquid rocket engine MLP
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High-performance bilayer IGZO thin-film transistors by sputtering heterojunction with differences in indium elemental content 认领 引用
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作者 Longfei Zhang Hanzhe Zhang +4 位作者 Yuhang Wang Shichen Su Xianghu Wang Dezhen Shen Hai Zhu 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第10期552-559,共8页
The high-quality semiconductor InGa ZnO(IGZO)alloy thin films with different indium(In)elemental contents were deposit utilized magnetron sputtering.The novel bilayer heterojunction TFT devices based on our fabricated... The high-quality semiconductor InGa ZnO(IGZO)alloy thin films with different indium(In)elemental contents were deposit utilized magnetron sputtering.The novel bilayer heterojunction TFT devices based on our fabricated IGZO films were proposed,and their performance exhibited significant improvement compared to single layer IGZO TFTs.In the bilayer heterojunction TFT,the field-effect mobility was promoted to 23.5 cm2·V-1·s-1,the switching ratio reached 4.1×107,and the subthreshold swing was reduced to 0.42 V/dec.Moreover,the variation of bilayer TFTs threshold voltage(Vth)was significantly suppressed,Under positive gate bias stress(PBS)and negative gate bias stress(NBS),the threshold shift is reduced to be 1.5 V and-1.1 V,respectively.The heterojunction within the bilayer IGZO films constructs a potential barrier at the interface,which facilitated the accumulation of channel electrons.Additionally,the low In-element content passivation layer in IGZO films not only preserved the channel of TFT but also reduced electron scattering,thereby the performance properties of TFT were enhancing.The excellent transistor characteristics of devices demonstrate the feasibility of our proposed bilayer heterojunction TFT,which will promote the basic research of IGZO device and accelerate the practical application of transparency IGZO TFT. 展开更多
关键词 semiconductor alloy film field effect transistors
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Bending Stiffness of Concrete-Filled Steel Tube and Its Influence on Concrete Placement Timing of Composite Beam-String Structure 认领 引用
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作者 Zhenyu Zhang Quan Jin +4 位作者 Haitao Zhang Zhao Liu Yuyang Wu Longfei Zhang Renzhang Yan 《Structural Durability & Health Monitoring》 EI 2025年第1期55-75,共21页
When the upper chord beam of the beam-string structure(BSS)is made of concrete-filled steel tube(CFST),its overall stiffness will change greatly with the construction of concrete placement,which will have an impact on... When the upper chord beam of the beam-string structure(BSS)is made of concrete-filled steel tube(CFST),its overall stiffness will change greatly with the construction of concrete placement,which will have an impact on the design of the tensioning plans and selection of control measures for the BSS.In order to accurately obtain the bending stiffness of CFST beam and clarify its impact on the mechanical properties of composite BSS during construction,the influence of some factors such as height-width ratio,wall thickness of steel tube,elasticity modulus of concrete,and friction coefficient on the bending stiffness are analyzed parametrically by the numerical simulation technology based on an actual project.The calculation formula of the equivalent bending stiffness of CFST is also established through mathematical statistical simulation.Then,the equivalent bending stiffness is introduced into the construction and use stages of the composite BSS,respectively,and the mechanical properties such as prestress-tensioning control value,structural deformation,and internal force of key members are comparatively analyzed when adopting two different construction plans.Moreover,the optimal construction plan of concrete placement first and then prestress-tensioning is proposed. 展开更多
关键词 Concrete panels freeze-thaw damage compression-shear crack tension-shear crack
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Aluminum hydride for solid-state hydrogen storage:Structure,synthesis, thermodynamics, kinetics, and regeneration 认领 引用 被引量：11
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作者 Haizhen Liu Longfei Zhang +6 位作者 Hongyu Ma Chenglin Lu Hui Luo Xinhua Wang Xiantun Huang Zhiqiang Lan Jin Guo 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第1期428-440,I0014,共13页
Aluminum hydride(AlH3) is a binary metal hydride that contains more than 10.1 wt% of hydrogen and possesses a high volumetric hydrogen density of 148 kg H2 m-3.Pristine AlH3 can readily release hydrogen at a modera... Aluminum hydride(AlH3) is a binary metal hydride that contains more than 10.1 wt% of hydrogen and possesses a high volumetric hydrogen density of 148 kg H2 m-3.Pristine AlH3 can readily release hydrogen at a moderate temperature below 200℃.Such high hydrogen density and low desorption temperature make AlH3 one of most promising hydrogen storage media for mobile application.This review covers the research activity on the structures,synthesis,decomposition thermodynamics and kinetics,regeneration and application validation of AlH3 over the past decades.Finally,the future research directions of AlH3 as a hydrogen storage material will be revealed. 展开更多
关键词 Hydrogen storage Aluminum hydride AlH3 Research progress Application
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Amorphous Si critical dimension structures with direct Si lattice calibration 认领 引用 被引量：6
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作者 Ziruo Wu Yanni Cai +4 位作者 Xingrui Wang Longfei Zhang Xiao Deng Xinbin Cheng Tongbao Li 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第3期130-134,共5页
Developing highly accurate critical dimension standards is a significant task for nanoscale metrology. In this paper, we put forward an alternative approach to fabricate amorphous Si critical dimension structures with... Developing highly accurate critical dimension standards is a significant task for nanoscale metrology. In this paper, we put forward an alternative approach to fabricate amorphous Si critical dimension structures with direct Si lattice calibration in the same frame scanning transmission electron microscopy image. Based on the traceable measurement analysis, the optimized method can provide the same calibration accuracy and increase the fabrication throughput and lower the cost simultaneously, which benefits the application needs in atomic force microscopy(AFM) tip geometry characterization,benchmarking measurement tools, and conducting comparison measurements between different approaches. 展开更多
关键词 critical dimension Si lattice transmission electron microscopy tip characterizer
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A two-dimensional air streamer discharge model based on the improved Helmholtz equation at low temperature and sub-atmospheric pressure 认领 引用 被引量：2
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作者 Zhihang ZHAO Xinlao WEI +2 位作者 Shuang SONG Lin CUI Longfei ZHANG 《Plasma Science and Technology》 SCIE EI CAS CSCD 2020年第4期71-82,共12页
In this paper,an efficient boundary condition is applied to solve the photoionization rate,and a two-dimensional numerical simulation is carried out for the development and propagation of an air streamer at low temper... In this paper,an efficient boundary condition is applied to solve the photoionization rate,and a two-dimensional numerical simulation is carried out for the development and propagation of an air streamer at low temperature and sub-atmospheric pressure.The results show that the new boundary condition improves the calculation accuracy,but the influence of photoionization on the streamer discharge process is not obvious.The discharge current in the development of streamer discharge is defined,and the corresponding expression of the positive and negative streamer discharge current is given.The influence of the electric field exceeding the threshold value on the discharge process is preliminarily introduced.In the process of discharge,only the propagation velocity of the streamer is obviously higher than that of normal temperature and pressure,and the trend of the other parameters is basically the same as that described in the previous paper.The above results give us a deeper understanding of the discharge characteristics under low temperature and sub-atmospheric pressure,which has certain significance for the development of aviation and high voltage engineering. 展开更多
关键词 efficient boundary condition discharge current propagation velocity threshold value low temperature and sub-atmospheric pressure
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Initiation and Kinematic Process of Debris Flow with the Existence of Terraced Fields at the Sources 认领 引用
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作者 Liang Yang Yang Wang +3 位作者 Kang Liao Longfei Zhang Aiyun Chen Juan Du 《Journal of Earth Science》 SCIE CAS CSCD 2024年第5期1613-1625,共13页
A debris flow,with terraced fields as the source area,broke out on June 25th,2018 in the Xiaotuga area of Yunnan Province,China,and this kind of debris flow is rarely recorded.Two purposes in this study:(1)the influen... A debris flow,with terraced fields as the source area,broke out on June 25th,2018 in the Xiaotuga area of Yunnan Province,China,and this kind of debris flow is rarely recorded.Two purposes in this study:(1)the influence of flow drag force on slope stability;(2)back-analyze the movement process of debris flow.First,the geological background and movement of this debris flow were described based on a field investigation.Then,drag force,calculated by the laminar flow theory,is added to the slope stability calculation model,which elaborates the initiation process of this disaster.Moreover,dynamic simulation software(DAN3D)was used to simulate the kinematic process of the debris flow with a variety of combination models.The study shows that the terrace area can quickly produce surface runoff and create a drag force under rainfall conditions,which is the essential reason for the initiation of debris flow.In addition,the use of the FVV(Frictional-Voellmy-Voellmy)model is found to provide the best performance in simulating this type of debris flow,which reveals that it lasts approximately 200 s and that the maximum velocity is 12 m/s. 展开更多
关键词 debris flow initiation process kinematic process terraced fields engineering geology
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A Novel Adsorbent Prepared by Aluminum-Containing Waste Residue and Its Application for Congo Red Wastewater Decolorization 认领 引用
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作者 Longfei Zhang Xiaogang Han Jinxin Mu 《Advances in Materials Physics and Chemistry》 CAS 2023年第9期161-176,共16页
Modified aluminum slag (MAS) was applied as an adsorbent for Congo red (CR) prepared by the hydrothermal treatment of Ca(OH)2. At 25°C, with a MAS dosage of 0.3 g, initial CR concentration of 100 mg/L and initial... Modified aluminum slag (MAS) was applied as an adsorbent for Congo red (CR) prepared by the hydrothermal treatment of Ca(OH)2. At 25°C, with a MAS dosage of 0.3 g, initial CR concentration of 100 mg/L and initial pH = 5, and the adsorption time was 40 min, the CR removal efficiency was 98.41%. The adsorption trend of CR conformed to the second-order kinetics, and the adsorption isotherm follows the Freundlich isotherm model. Compared with RAS, MAS has a larger pore volume and specific surface area. The mechanism of action of MAS on CR was the interaction between membrane diffusion and internal diffusion, and the adsorption rate during the membrane diffusion was the fastest. 展开更多
关键词 Modified Aluminum Containing Waste Congo Red Adsorption Wastewater
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几种水生模式生物在持久性有机污染物毒理学评价中的研究进展 认领 引用 被引量：6
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作者 王梦圆 张龙飞 +4 位作者 汤云瑜 蔡友琼 顾润润 黄冬梅 史永富 《环境化学》 CAS CSCD 北大核心 2021年第5期1361-1378,共18页
持久性有机污染物对环境及生物体产生的危害已引起全球范围内的持续关注。此类物质能够富集在生物体内,并通过食物链传递产生生物放大效应,进而引发“三致”作用、发育毒性、内分泌干扰效应等。水生模式生物具有饲养成本低、生理周期较... 持久性有机污染物对环境及生物体产生的危害已引起全球范围内的持续关注。此类物质能够富集在生物体内,并通过食物链传递产生生物放大效应,进而引发“三致”作用、发育毒性、内分泌干扰效应等。水生模式生物具有饲养成本低、生理周期较短、繁殖量大等优点而被广泛应用于POPs毒理学评价。本文聚焦斑马鱼、青鳉鱼、非洲爪蟾等几种水生模式生物,对其在POPs毒性效应研究中的应用进展进行综述,包括POPs所致骨骼发育畸形、心血管系统病变、性腺发育异常等发育毒性,卵黄蛋白原的诱导、性腺指数、甲状腺激素水平的改变等内分泌干扰效应以及神经行为异常等相关研究内容,希望为POPs污染现状评估以及毒理效应的深入探索、疾病预测模型的建立提供资料参考,并对该领域研究过程中生物模型的筛选具有借鉴意义。 展开更多
关键词 水生模式生物 持久性有机污染物 斑马鱼 青鳉鱼 非洲爪蟾 毒理效应
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15-7PH不锈钢电渣重熔过程夹杂物的行为 认领 引用 被引量：3
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作者 常立忠 项淼苗 +4 位作者 徐涛 张龙飞 苏云龙 金涛 施晓芳 《过程工程学报》 CAS CSCD 北大核心 2023年第2期244-253,共10页
为了明晰15-7PH沉淀硬化不锈钢中夹杂物的行为,进一步提高其洁净度,采用超高功率电弧炉初炼→AOD(Argon Oxygen Decarburization)脱碳→LF(Ladle Furnace)精炼→模铸工艺制备了自耗电极,并用带压摆控制的气体保护电渣重熔炉进行重熔。采... 为了明晰15-7PH沉淀硬化不锈钢中夹杂物的行为,进一步提高其洁净度,采用超高功率电弧炉初炼→AOD(Argon Oxygen Decarburization)脱碳→LF(Ladle Furnace)精炼→模铸工艺制备了自耗电极,并用带压摆控制的气体保护电渣重熔炉进行重熔。采用HORIBA氧氮氢气体分析仪检测了电渣重熔前后氧、氮等含量的变化;ASPEX扫描电镜分析了夹杂物的尺寸、数目、化学成分、形貌等。结果表明,电渣重熔后15-7PH不锈钢中氧、氮含量有轻微的下降,但夹杂物的组成变化不大,主要由氮化物夹杂物(氮化铝+氮化钛)、氮化物-氧化物复合夹杂物、氧化物夹杂物、硫化物-氧/氮化物夹杂物组成,其中氮化物夹杂物尺寸最大、数量最多,明显高于其他夹杂物。电渣重熔对夹杂物的数量、尺寸有明显影响。重熔后夹杂数量大幅增加,氮化物尤为明显,但大颗粒夹杂物明显减少。氮化物夹杂物大量存在的主要原因在于钢中存在较高的Al,Ti,N等元素,而电渣过程由于熔渣吸附、部分夹杂物溶解,使大颗粒夹杂物减少,重熔过程的快速冷却抑制了夹杂物长大,最终结果是夹杂物尺寸更细小,但数量增加。 展开更多
关键词 洁净度 15-7PH不锈钢 电渣重熔 氮化物 夹杂物 氧
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An Analysis of the Pre-writing Strategies Employed by Chinese College Students in the Timed Examination 认领 引用
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作者 Longfei Zhang 《Journal of International Education and Practice》 2021年第3期22-27,共6页
This thesis is trying to analyze the pre-writing strategies used by Chinese college students in a timed examination.The purposes of this study is to identify the possible strategies the Chinese college students claime... This thesis is trying to analyze the pre-writing strategies used by Chinese college students in a timed examination.The purposes of this study is to identify the possible strategies the Chinese college students claimed they used in the pre-writing stage of the timed examination,find if differences exist between the pre-writing strategies employed by skilled writers and unskilled writers,and find which strategy best facilitate writing in a timed condition. 展开更多
关键词 Pre-writing strategies Chinese college students In timed examination Skilled writers Unskilled writers
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Turn-taking in EFL Classroom Discourse 认领 引用
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作者 Longfei Zhang 《Review of Educational Theory》 2021年第4期83-89,共7页
In this essay,there will be a contrast and comparison between the teacherdominant turn-taking patterns and students-centered turn-taking patterns.This comparison can help us to find out which pattern can help develop ... In this essay,there will be a contrast and comparison between the teacherdominant turn-taking patterns and students-centered turn-taking patterns.This comparison can help us to find out which pattern can help develop an effective turn-taking in classroom discourse.In terms of the turn-taking pattern in EFL classroom,there also will be a study of turn-taking patterns.This study is concentrated on the EFL students who study in foreign language classroom.Different turn-taking patterns will be recorded to analyze students’language performance and language anxiety during the turns change process.Brown(2008)proposes that senior foreign language learners tend to be influenced by the low sense of confidence,the feel of shame and inferiority.However,evidence shows that many students with higher level of language proficiency also are silent in the foreign language classroom.They seldom take turns to make a contribution to the speech in the classroom.This essay shows great interests in the relationship between EFL learners’language anxiety and turn-taking patterns.Particularly,this essay will explore the several turn-taking patterns which can help to foster the flow of classroom talk.These turn-taking patterns will be analyzed in two directions:the teacher-fronted turns exchange and students-centered exchange.This can help EFL teachers to adjust the turn-taking patterns to the classroom teaching to help students get more involvements in the classroom conversation. 展开更多
关键词 Classroom teaching and learning Turn-taking Linguistic elements EFL learners Intercultural elements Turn-raising signals Turn-taking patterns
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Stokes/anti-Stokes luminescence in Er3+-doped fluoride glass enabled dual-mode ultraviolet/infrared photodetection and visible-display integration for secure optical communication 认领 引用 被引量：2
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作者 Longfei Zhang Tingting Yan +2 位作者 Yiguang Jiang Long Zhang Xiaosheng Fang 《Science Bulletin》 SCIE EI CAS CSCD 2025年第21期3553-3561,共9页
Integrating photodetection and display functions within a single electronic device holds significant application prospects.However,to date,most of them relied on complex device structures that involve photodetectors w... Integrating photodetection and display functions within a single electronic device holds significant application prospects.However,to date,most of them relied on complex device structures that involve photodetectors with readout circuits or integration with light-emitting diodes(LEDs).Here,we introduce infrared optical material—Er3+doped fluoride glass—into conventional organic photodetectors,enabling new material options for advanced photodetection and imaging technologies.A novel compact system that achieves dual-mode of ultraviolet(UV)/infrared(IR)photodetection and visible display by introducing fluoride glass with excellent Stokes/anti-Stokes luminescence in an organic photodetector(OPD).This device exhibits an ultra-wideband response across multiple wavelengths,ranging from approximately 250 to 1550 nm.It presents impressive IR responsivity(∼8 mA/W with anti-Stokes luminescence)and UV photoresponse enhancement(from∼1.5 to∼3.5μA with Stokes luminescence).Additionally,it enables direct visible display for wavelengths of 1550,980,and 355 nm.The device can function effectively at high temperatures of up to 200℃for 30 min.Based on this device,a visible and secure optical communication process is successfully realized with UV(275 nm)-IR(1550 nm)communication bands. 展开更多
关键词 Photodetection Visible-display Dual-mode Down-conversion and up-conversion Secure optical communication
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Mechanically robust SiC aerogel with both electromagnetic absorption and pollutant adsorption via microtube/nanowire structure design 认领 引用
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作者 Baojie Zhang Wanxin Zhi +3 位作者 Jinshuo Duan Longfei Zhang Furong Liang Chen Ma 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2025年第11期115-125,共11页
Silicon carbide(SiC)fiber aerogels are promising materials for renewable energy and aerospace applications.However,conventional SiC aerogels often suffer from limitations such as single-pore structures,inadequate mech... Silicon carbide(SiC)fiber aerogels are promising materials for renewable energy and aerospace applications.However,conventional SiC aerogels often suffer from limitations such as single-pore structures,inadequate mechanical strength,and high production costs,which severely restrict their practical application.Here,we designed and fabricated a hierarchical porous SiC microtubeanowire composite aerogel derived from kapok fibers via an in situ conversion strategy.This approach directly utilizes kapok hollow fibers to construct SiC microtubules while simultaneously inducing the self-growth of SiC nanowires,achieving controllable hierarchical pore fabrication in a single step.Compared with conventional methods,this strategy significantly simplifies the fabrication process and enhances multifunctional performance through structural synergy.The unique microtube-nanowire heterostructure provides excellent electromagnetic wave(EMW)absorption(minimum reflection loss(RL)of−56.39 dB,effective absorption bandwidth of 6.04 GHz at 2.0 mm)by enhancing interfacial polarization and optimizing impedance matching.The nanowire bridging effect achieves a compressive strength of 2.85 MPa,surpassing the mechanical limits of conventional aerogels.Additionally,the aerogel exhibited excellent thermal insulation(0.021 W·m−1·K−1)and pollutant adsorption capacity(45-67 times its weight).This research offers a new approach for developing high-strength,multifunctional SiC aerogels. 展开更多
关键词 silicon carbide(SiC)aerogel ceramic fiber electromagnetic wave(EMW)absorption thermal insulation
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Predicting the propensity for thermally activated β events in metallic glasses via interpretable machine learning 认领 引用 被引量：8
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作者 Qi Wang Jun Ding +3 位作者 Longfei Zhang Evgeny Podryabinkin Alexander Shapeev Evan Ma 《npj Computational Materials》 SCIE EI CSCD 2020年第1期46-57,共12页
The elementary excitations in metallic glasses(MGs),i.e.,β processes that involve hopping between nearby sub-basins,underlie many unusual properties of the amorphous alloys.A high-efficacy prediction of the propensit... The elementary excitations in metallic glasses(MGs),i.e.,β processes that involve hopping between nearby sub-basins,underlie many unusual properties of the amorphous alloys.A high-efficacy prediction of the propensity for those activated processes from solely the atomic positions,however,has remained a daunting challenge.Recently,employing well-designed site environment descriptors and machine learning(ML),notable progress has been made in predicting the propensity for stress-activated β processes(i.e.,shear transformations)from the static structure. 展开更多
关键词 structure glasses metallic
The mechanisms of enhanced thickness-dependent DC breakdown strength of EP/MWCNTs nanocomposites 认领 引用 被引量：5
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作者 Zhen Li He Gao +3 位作者 Longfei Zhang Shouming Wang Ji Liu Shengtao Li 《High Voltage》 SCIE EI CSCD 2024年第2期440-452,共13页
Owing to advanced power electronic and electrical applications developing towards miniaturisation and integration,the thickness-dependent DC breakdown mechanism of epoxy/multiwall-carbon-nanotube nanocomposites is und... Owing to advanced power electronic and electrical applications developing towards miniaturisation and integration,the thickness-dependent DC breakdown mechanism of epoxy/multiwall-carbon-nanotube nanocomposites is under investigation.The results indicate that the breakdown strength of nanocomposites containing 0.05 wt%multiwall-carbon-nanotubes rises by~18%,and the breakdown strength falls exponentially with increasing thickness.To clarify the microscopic mechanism,a simulation model of DC breakdown,including carriers transport and segmental dynamics,is developed,and the accordant simulation results with experimental results indicate that the thickness-dependent DC breakdown of epoxy/multiwall-carbon-nanotube nanocomposites is determined both by segment chain dynamics and charge transport.According to the breakdown model analysis,the effects of multiwall-carbon-nanotube on enhanced breakdown strength are caused by the increased amount of deep traps in the interfacial region,while the influence of thickness is attributed to the enlarged segment chain displacement and electric field distortion as the voltage raising time increases. 展开更多
关键词 strength breakdown nanocomposites
Piezoelectric Zinc Oxides with High Polar Facets Ratios for Mechanically Controlled RAFT Polymerization 认领 引用 被引量：1
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作者 Chengqiang Ding Ziye Ren +5 位作者 Jian Wang Longfei Zhang Yuhan Yan Danming Wu Zhao Wang Zhengbiao Zhang 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2023年第20期2691-2696,共6页
Mechanoredox chemistry that uses highly polarized piezoelectric materials as mechanoredox catalysts to promote redox reactions has emerged recently.It provides an alternative approach alongside the existing polymeriza... Mechanoredox chemistry that uses highly polarized piezoelectric materials as mechanoredox catalysts to promote redox reactions has emerged recently.It provides an alternative approach alongside the existing polymerization methods.Despite recent accomplishments,determining the quantitative relationship between the structure of ZnO and its catalytic performance for polymerization is still challenging.Herein,we prepared various ZnO crystals with different polar facets ratios to achieve efficient mechanically induced reversible addition-fragmentation chain transfer polymerization(mechano-RAFT).ZnO prepared from Zn(NO3)2 showed a high polar facet ratio of 1.66 and offered the highest catalytic activity among all ZnO samples.A near-quantitative initiator efficiency of 99.5%and narrow molecular weight distribution were achieved for the polymerization of n-butyl acrylate.Furthermore,the high chain-end fidelity and chain extension capability were also evidenced by MALDI-TOF MS and GPC analysis.This work highlighted the significant contribution of polar facets in ZnO to its catalytic activity and will guide the design of mechanoredox catalysis with superior catalytic performance in the future. 展开更多
关键词 Mechanoredox chemistry Catalytic activity ZnO crystals RAFT polymerization
股骨夹具修复股骨粗隆间骨折的有限元分析 认领 引用
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作者 陈升阳 章龙飞 +3 位作者 蔡宇浩 陈嘉智 武永霞 窦帮 《建模与仿真》 2025年第12期95-101,共7页
针对股骨粗隆间骨折的修复问题,本文以最常见的股骨近端防旋髓内钉(PFNA)装置作为测试装置。本文采用有限元分析的方法,对比分析了髓内钉主钉与螺旋刀片的不同夹角(68˚、64˚和72˚)静止站立状态下股骨、内固定装置变形及应力的分布特征,... 针对股骨粗隆间骨折的修复问题,本文以最常见的股骨近端防旋髓内钉(PFNA)装置作为测试装置。本文采用有限元分析的方法,对比分析了髓内钉主钉与螺旋刀片的不同夹角(68˚、64˚和72˚)静止站立状态下股骨、内固定装置变形及应力的分布特征,并与同等条件下正常股骨的力学特征进行了比较。结果表明,68˚PFNA组的股骨最大变形与正常股骨最为相似,最大等效应力集中在骨钉处,相较于64˚和72˚PFNA组更有利于骨折修复,故佐证68˚为股骨夹具修复的最佳角度。 展开更多
关键词 股骨粗隆间骨折 有限元分析 等效应力 变形
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