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Organic Radical-Boosted Ionic Conductivity in Redox Polymer Electrolyte for advanced Fiber-Shaped Energy Storage Devices

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Nano-Micro Letters 2025年第8期17卷 202-218页

作者： Jeong-Gil Kim Jaehyoung Ko Hyung-Kyu Lim Yerin Jo Hayoung Yu Min Woo Kim Min Ji Kim Hyeon Su Jeong Jinwoo Lee Yongho Joo Nam Dong Kim Institute of Advanced Composite Materials Korea Institute of Science and Technology92 Chudong-roBongdong-eupWanju-gunJeollabuk-do 55324Republic of Korea Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology291 Daehak-roYuseong-guDaejeon 34141Republic of Korea Division of Chemical and Bioengineering Kangwon National UniversityChuncheon 24341Republic of Korea Department of Materials Science and Engineering Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea

Fiber-shaped energy storage devices(FSESDs)with exceptional flexibility for wearable power sources should be applied with solid electrolytes over liquid electrolytes due to short circuits and leakage issue during *** the solid options,polymer electrolytes are particularly preferred due to their robustness and flexibility,although their low ionic conductivity remains a significant ***,we present a redox polymer electrolyte(HT_RPE)with 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl(HT)as a multi-functional *** acts as a plasticizer that transforms the glassy state into the rubbery state for improved chain mobility and provides distinctive ion conduction pathway by the self-exchange reaction between radical and oxidized *** synergetic effects lead to high ionic conductivity(73.5 mS cm−1)based on a lower activation energy of 0.13 eV than other redox ***,HT_RPE with a pseudocapacitive characteristic by HT enables an outstanding electrochemical performance of the symmetric FSESDs using carbon-based fiber electrodes(energy density of 25.4 W h kg^(−1) at a power density of 25,000 W kg^(−1))without typical active materials,along with excellent stability(capacitance retention of 91.2%after 8,000 bending cycles).This work highlights a versatile HT_RPE that utilizes the unique functionality of HT for both the high ionic conductivity and improved energy storage capability,providing a promising pathway for next-generation flexible energy storage devices.

关键词： Redox polymer electrolyte Hydroxy-TEMPO Ionic conductivity Self-exchange reaction Fiber-shaped energy storage devices

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HDD-Net: Haar Dual Domain Network for Ring Artifacts Correction

IEEE Transactions on Computational Imaging

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IEEE Transactions on Computational Imaging 2025年 11卷 399-409页

作者： Wu, Xuelong Wang, Junsheng Zhao, Qingjie Beijing Institute of Technology School of Mechanical Engineering Beijing100081 China Beijing Institute of Technology Advanced Research Institute for Multidisciplinary Science School of Materials Science and Engineering Beijing100081 China Beijing Institute of Technology School of Computer Science Beijing100081 China

Ring artifacts are common artifacts in X-ray Computed Tomography (XCT) scans and have a significant impact on subsequent feature/phase extractions due to the small grayscale gradients in XCT volume data of bulk materials. This paper proposes the Haar Dual Domain Network for correcting ring artifacts. By utilizing the Haar wavelet decomposition on images containing ring artifacts in both the image and projection domains, the ring artifacts are preliminarily separated, facilitating their removal by neural networks while preserving microstructure features such as low-contrast phase boundaries. By constructing a feature fusion network, the information from both 2D slices and 3D projection volume data has been fully integrated to eliminate ring artifacts while preserving the edges of every feature. The effectiveness of the Haar wavelet transform and fusion network has been validated by ablation experiments, proving the application of HDD-Net to large volume of XCT data. © 2015 IEEE.

关键词： Wavelet decomposition

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Fatigue failure analysis and heat treatment strategy optimization of torsion bar spring for automobile suspension system used in light vehicles

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Journal of Iron and Steel Research International 2025年第3期32卷 799-811页

作者： Jia-xing Liu Yong-jin Wu Chao-lei Zhang Wan-li Sun Wen-bin Ding Shuai-jun Dong Institute for Carbon Neutrality School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang110167LiaoningChina

The failure analysis was conducted on unqualified torsion bar spring in automobile suspension system used for light vehicles during engine *** effects of through hardening,surface induction hardening,quenching and tempering,and tempering temperature on the microstructure and fatigue life of 45CrNiMoVA steel torsion bars were also *** showed that only the torsion bar spring after through quenching and tempering is subjected to surface induction quenching and tempering to achieve the fatigue life of the qualified torsion *** fatigue life of torsion bar spring reaches 3×10^(5) cycles more than the required 2×10^(5) *** is because the distribution of gradient microstructure was helpful to relieve the applied stress during the fatigue *** microstructure of the non-hardened region,which consists of tempered sorbite regardless of whether it is tempered at 330 or 430℃,contributes to minimizing the impact of temper brittleness on the fatigue life of the torsion ***,the fatigue life of the torsion bar is relatively unaffected by temper brittleness due to the presence of tempered sorbite in its non-hardened *** the reason for the unqualified fatigue life was that the depth and hardness of the hardened region did not meet the standard requirements of 5–7 mm and 47–52 HRC,respectively.

关键词： Fatigue life Torsion bar Tempering temperature 45CrNiMoVA steel Fracture

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Simultaneous measurement of thermal conductivity, heat capacity, and interfacial thermal conductance by leveraging negative delay-time data in time-domain thermoreflectance

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Progress in Natural science: Materials International 2025年第2期35卷 375-384页

作者： Zhang, Mingzhen Chen, Tao Zeng, Ao Tang, Jialin Guo, Ruiqiang Jiang, Puqing School of Energy and Power Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Thermal Science Research Center Shandong Institute of Advanced Technology Shandong Jinan250103 China Institute of Advanced Technology Shandong University Shandong Jinan250061 China

Time-domain thermoreflectance (TDTR) is a widely used technique for characterizing the thermal properties of bulk and thin-film materials. Traditional TDTR analyses typically focus on positive delay time data for fitting, often requiring multiple-frequency measurements to simultaneously determine thermal conductivity and heat capacity. However, this multiple-frequency approach is cumbersome and may introduce potential errors due to practical challenges to ensure consistent measurements across different frequencies. In this study, we propose a novel solution to these challenges by harnessing the underexplored negative delay time data in TDTR. By integrating these data points, we offer a streamlined, single-frequency method that simultaneously measures thermal conductivity, heat capacity, and interfacial thermal conductance for both bulk and thin-film materials, enhancing measurement efficiency and accuracy. We demonstrate the effectiveness of this method by measuring several bulk samples including sapphire, silicon, diamond, and Si0.992Ge0.008, and several thin-film samples including a 1.76-μm-thick gallium nitride (GaN) film epitaxially grown on a silicon substrate, a 320-nm-thick gallium oxide (Ε-Ga2O3) film epitaxially grown on a silicon carbide substrate, and a 330-nm-thick tantalum nitride (TaN) film deposited on a sapphire substrate, all coated with an aluminum (Al) transducer layer on the surface. Our results show that the new method accurately determines the thermal conductivity and heat capacity of these samples as well as the Al/sample interfacial thermal conductance using a single modulation frequency, except for the Si0.992Ge0.008 sample. This study sheds light on the untapped potential of TDTR, offering a new, efficient, and accurate avenue for thermal analysis in material science. © 2025 Chinese Materials Research Society

关键词： Sapphire

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Armoring hydrophilic wood-structured ultrathick electrode with bimetallic nitride enables high energy-density supercapacitor

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Green Energy & Environment 2025年第2期10卷 345-357页

作者： Nannan Ming Jikun Xu Jingfang Lei Cankun Hu Kaifu Huo Institute of Advanced Materials and Nanotechnology School of Chemistry and Chemical EngineeringWuhan University of Science and TechnologyWuhan430081China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China

Thick electrodes can reduce the ratio of inactive constituents in a holistic energy storage system while improving energy and power ***,traditional slurry-casting electrodes induce high-tortuous ionic diffusion routes that directly depress the capacitance with a thickening *** overcome this,a novel 3D low-tortuosity,self-supporting,wood-structured ultrathick electrode(NiMoN@WC,a thickness of~1400 mm)with hierarchical porosity and artificial array-distributed small holes was constructed via anchoring bimetallic nitrides into the monolithic wood *** the embedded NiMoN nanoclusters with well-designed geometric and electronic structure,the vertically low-tortuous channels,enlarged specific surface area and pore volume,superhydrophilic interface,and excellent charge conductivities,a superior capacitance of NiMoN@WC thick electrodes(~5350 mF cm^(-2)and 184.5 F g^(-1))is achieved without the structural *** especial,monolithic wood carbons with gradient porous network not only function as the high-flux matrices to ameliorate the NiMoN loading via cell wall engineering but also allow fully-exposed electroactive substance and efficient current collection,thereby deliver an acceptable rate capability over 75%retention even at a high sweep rate of 20 mA cm^(-2).Additionally,an asymmetric NiMoN@WC//WC supercapacitor with an available working voltage of 1.0-1.8 V is assembled to demonstrate a maximum energy density of~2.04 mWh cm^(-2)(17.4 Wh kg^(-1))at a power density of 1620 mW cm^(-2),along with a decent long-term lifespan over 10,000 charging-discharging *** a guideline,the rational design of wood ultrathick electrode with nanostructured transition metal nitrides sketch a promising blueprint for alleviating global energy scarcity while expanding carbon-neutral technologies.

关键词： Wood-structured thick electrode Supercapacitors Transition metal nitrides Low tortuosity

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Effect of Ti Additions on Mechanical and Thermodynamic Properties of W-Ti Alloys: A First-principles Study

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Journal of Wuhan University of technology(Materials science) 2025年第1期40卷 246-257页

作者： ZHANG Jian NIE Wei HUANG Jin ZHU Ke LIU Ruxia ZHANG Ruizhi LUO Guoqiang SHEN Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China

The mechanical and thermodynamic properties of W-Ti alloys(including W_(15)Ti_(1),W_(14)Ti_(2),W_(12)Ti_(4) and W_(8)Ti_(8) alloys)were investigated by the first-principles approach based on density functional *** results indicate that W-Ti alloys except W_(8)Ti_(8) are thermodynamically *** modulus and hardness of W-Ti alloys are smaller than those of pure tungsten and gradually decrease with increasing Ti ***,their B/G ratios and Poisson's ratios exceed those of pure tungsten,suggesting that the introduction of Ti decreases the mechanical strength while enhancing the ductility of W-Ti *** thermal expansion coefficients for W-Ti alloys all surpass those of pure tungsten,indicating that the introduction of titanium exacerbates the thermal expansion behavior of W-Ti ***,elevated pressure has the capacity to suppress the thermal expansion tendencies in titanium-doped tungsten *** study offers theoretical insights for the design of nuclear materials by exploring the mechanical and thermodynamic properties of W-Ti alloys.

关键词： first-principles mechanical properties thermodynamic properties tungsten-titanium alloys

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Phase formation mechanism of Cr2AlC MAX phase coating:In-situ TEM characterization and atomic-scale calculations

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材料科学技术（英文版） 2025年第3期206卷 176-184页

作者： Guanshui Ma Haichen Wu Zhi Fang Xiaohui Zhou Rende Chen Wei Yang Jiayue Zhang Zhenyu Wang Aiying Wang Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Analytical Center Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Beijing Innovation Centre for Engineering Science and Advanced Technology School of Materials Science and EngineeringPeking UniversityBeijing 100871China

Cr2AlC,a representative MAX phase,gains increasing attention for the excellent oxidation tolerance and corrosion resistance used in harsh high temperature and strong radiation ***,the lack of the phase formation mechanism has become the key bottleneck to the practical applications for Cr2AlC synthesis with high purity at low *** this work,we fabricated the amorphous Cr-Al-C coating by a hybrid magnetron sputtering/cathodic arc deposition technique,in which the in-situ heating transmission electron microscopy(TEM)was conducted in a temperature range of 25-650 ℃ to address the real-time phase transformation for Cr2AlC *** results demonstrated that increas-ing the temperature from 25 to 370 ℃ led to the structural transformation from amorphous Cr-Al-C to the crystalline Cr2Al ***,the high-purity Cr2AlC MAX phase was distinctly formed at 500 ℃,accompanied by the diminished amorphous *** the further increase of temperature to 650 ℃,the decomposition of Cr2AlC to Cr7C3 impurities was *** phase evolution was also evidenced by the Ab-initio molecular dynamics calculations,where the bond energy of Cr-Cr,Cr-Al,and Cr-C played the key role in the formed crystalline stability during the heating *** observa-tions not only provide fundamental insight into the phase formation mechanism for high-purity Cr2AlC coatings but also offer a promising strategy to manipulate the advanced MAX phase materials with high tolerance to high-temperature oxidation and heavy ion radiations.

关键词： Cr2AlC MAX phases In-situ heating transmission electron microscopy Phase formation Bond energy

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Isao Tokuda School of Information science,Japan advanced institute of science and technology,1-1 asahidai,nomi-shi,Ishikawa 923-1292,Japan

Isao Tokuda School of Information Science,Japan Advanced Ins...

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The Third International Conference on Dynamics, Vibration and Control

作者： Isao Tokuda School of Information Science Japan Advanced Institute of Science and Technology1-1 asahidainomi-shiIshikawa 923-1292Japan

＜正＞Synchronization plays an essential role in cooperative performance of music such as orchestra or *** of the musical instruments or pitches of the singing voices should be entrained in such a way that they create a nice harmony,where harmonic sounds should satisfy rational frequency relationship（e.g..3:2 for perfect fifth）.If sounds of the music players are not synchronized,their cooperative performance should not be *** the other hand,if a perfect synchronization is achieved,such performance may sound as machinery （computer- generated music）,and should be less *** artistic music play may lie between such two extreme *** aim of the present study is to clarify the synchronization structure inherent in singing voices in *** an index of synchronization,differences in frequency and timing are *** psychological experiment using synthesized sounds,we detect minimum frequency difference as well as minimum timing difference that degrade the chorus *** we investigate the pitch relationship between two singers who sing in *** recorded EGG（electroglottography） signals to measure glottal cycles of each *** subjects are classified into two groups:1) group of singers who are regular members of a chorus team.2) group of untrained singers who have few experience on *** compared the experienced singers with inexperienced ones to see the *** results show that the frequency difference observed in the experienced singers is relatively smaller than the inexperienced *** not much difference was observed for the difference in *** recording study is consistent with the psychological *** results provide a hint for understanding the synchronism inherent in a good performance of cooperative music play.

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Surface morphology generation mechanism of cortical bone longitudinal-torsional ultrasonic vibration assisted micro-milling

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Journal of Manufacturing Processes 2025年 145卷 300-312页

作者： Gao, Peng Wang, Min Liang, Zhiqiang Gao, Xiangsheng Zan, Tao Beijing Key Laboratory of Advanced Manufacturing Technology Beijing University of Technology Beijing100124 China Key Laboratory of Fundamental Science for Advanced Machining Beijing Institute of Technology Beijing100081 China

Bone ultrasonic vibration micro-milling has an advantage of low cutting damage, and it potentially applied in minimally invasive medical surgery. However, cortical bone is a quasi-brittle biological material, and its cutting surface morphology generation mechanism are complex. Hence, this paper reveals the surface morphology generation mechanism of bone micro longitudinal-torsional ultrasonic assisted milling (LTUAM). The surface morphology generation of different cutting parameters in LTUAM was simulated. The bone ultrasonic vibration micro-milling experiments were carried out considering the bone transverse, across and parallel cutting directions. The surface morphology generation mechanism of cortical bone tissue in LTUAM was discussed. The experimental results indicated the crack propagation is strongly influenced by the micro-milling direction. The crack tends to propagate in parallel milling direction due to cement line cracking. The surface of bone in LTUAM has less damage and more smoother surface morphology. The bone LTUAM method effectively suppresses brittle fracture cutting, and reduces surface damage defects. This research provides efficient minimally invasive cutting methods and technical support for minimally invasive interventional surgical medical equipment. © 2025

关键词： Bone

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Glucocorticoid receptor signaling in the brain and its involvement in cognitive function

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Neural Regeneration Research 2025年第9期20卷 2520-2537页

作者： Chonglin Su Taiqi Huang Meiyu Zhang Yanyu Zhang Yan Zeng Xingxing Chen Brain Science and Advanced Technology Institute Hubei Province Key Laboratory of Occupational Hazard Identification and ControlSchool of MedicineWuhan University of Science and TechnologyWuhanHubei ProvinceChina

The hypothalamic-pituitary-adrenal axis regulates the secretion of glucoco rticoids in response to environmental *** the brain,a nuclear receptor transcription fa ctor,the glucocorticoid recepto r,is an important component of the hypothalamicpituitary-a d renal axis's negative feedback loop and plays a key role in regulating cognitive equilibrium and *** glucoco rticoid receptor influences cognitive processes,including glutamate neurotransmission,calcium signaling,and the activation of brain-derived neurotrophic factor-mediated pathways,through a combination of genomic and non-genomic *** interactions within the central nervous system can alter the expression and activity of the glucocorticoid receptor,there by affecting the hypothalamic-pituitary-a d renal axis and stress-related cognitive *** appropriate level of glucocorticoid receptor expression can improve cognitive function,while excessive glucocorticoid receptors or long-term exposure to glucoco rticoids may lead to cognitive *** with cognitive impairment-associated diseases,such as Alzheimer's disease,aging,depression,Parkinson's disease,Huntington's disease,stroke,and addiction,often present with dysregulation of the hypothalamic-pituitary-adrenal axis and glucocorticoid receptor *** review provides a comprehensive overview of the functions of the glucoco rticoid receptor in the hypothalamic-pituitary-a d renal axis and cognitive *** emphasizes that appropriate glucocorticoid receptor signaling fa cilitates learning and memory,while its dysregulation can lead to cognitive *** provides clues about how glucocorticoid receptor signaling can be targeted to ove rcome cognitive disability-related disorders.

关键词： brain-derived neurotrophic factor calcium signaling glucocorticoid receptor glucocorticoid glutamate transmission hypothalamic-pituitary-adrenal axis long-term potentiation neurocognitive disorders neuroplasticity stress

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