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Superhydrophobic and corrosion-resistant siloxane-modified MgAl-LDHs coatings on magnesium alloy prepared under mild conditions

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 450-463页

作者： Wenxi Zhang Zhangzelong Zhuo Dan Xu Liang wu Zhihui Xie Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China College of Materials Science and Engineering/National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China

We have developed a superhydrophobic and corrosion-resistant LDH-W/PFDTMS composite coating on the surface of Mg *** composite comprised a tungstate-intercalated(LDH-W)underlayer that was grown at low temperature(relative to hydrothermal reaction conditions)under atmospheric pressure and an outer polysiloxane layer created from a solution containing perfluorodecyltrimethoxysilane(PFDTMS)using a simple immersion *** successful intercalation of tungstate into the LDH phase and the following formation of the polysiloxane layer were confirmed through X-ray diffraction(XRD),Fourier transform infrared(FTIR)spectroscopy,and X-ray photoelectron spectroscopy(XPS).The corrosion resistance of the LDH-W film,both before and after the PFDTMS modification,was evaluated using electrochemical impedance spectroscopy(EIS),Tafel curves,and immersion *** results showed that Mg coated with LDH-W/PFDTMS exhibited significantly enhanced corrosion protection compared to the unmodified LDHW film,with no apparent signs of corrosion after exposure to 3.5wt%NaCl solution for 15 ***,the LDH-W/PFDTMS coating demonstrated superior superhydrophobicity and self-cleaning properties against water and several common beverages,as confirmed by static contact angle and water-repellency *** results offer valuable insights into preparing superhydrophobic and corrosion-resistant LDH-based composite coatings on Mg alloy surfaces under relatively mild reaction conditions.

关键词： Mg alloy corrosion coating layered double hydroxide

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Nanostructured ZnO/BiVO_(4)I-scheme heterojunctions for piezocatalytic degradation of organic dyes via harvesting ultrasonic vibration energy

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 488-497页

作者： Yiling Li Xiaoyao Yu Yingjie Zhou Yao Lin Ying wu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China

BiVO_(4)porous spheres modified by ZnO were designed and synthesized using a facile two-step *** resulting ZnO/BiVO_(4)composite catalysts have shown remarkable efficiency as piezoelectric catalysts for degrading Rhodamine B(RhB)unde mechanical vibrations,they exhibit superior activity compared to pure *** 40wt%ZnO/BiVO_(4)heterojunction composite displayed the highest activity,along with good stability and *** enhanced piezoelectric catalytic activity can be attributed to the form ation of an I-scheme heterojunction structure,which can effectively inhibit the electron-hole ***,hole(h+)and superoxide radical(·O_(2)^(-))are proved to be the primary active ***,ZnO/BiVO_(4)stands as an efficient and stable piezoelectric catalyst with broad potential application in the field of environmental water pollution treatment.

关键词： piezoelectric catalytic heterojunction dye degradation ultrasonic vibration

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Phase transition in modified thermodynamics of Kerr-AdS black holes

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Chinese Physics C 2025年第1期49卷 350-358页

作者： Qin Liu Xiaoning wu Xiao Zhang School of Physical Science and Technology Guangxi UniversityNanning 530004China Guangxi Center for Mathematical Research Guangxi UniversityNanning 530004China Institute of Mathematics Academy of Mathematics and Systems Science and Hua Loo-Keng LaboratoryChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

In this study,we investigate the critical phenomena of Kerr-AdS black holes under the modified first law of ***,we considered modified black hole thermodynamics that exhibit a van der Waalslike phase *** critical exponents were calculated,and then,a swallowtail diagram of free energy was *** with existing results,the main difference is the correspondence between the thermal quantities of Kerr-AdS black holes and the van der Waals *** a previous study[***,***,and ***,***.D 85044005(2012)],the correspondence was(Ω_(H),J)→(V,P),while in our study,the correspondence was(J,Ω_(H))→(V,P).This difference was owing to the rotating *** modified black hole thermodynamics were associated with rotating *** free energy in such a reference contains extra rotating energy,which induces a Legendre transformation in the(Ω_(H),J)cross-section,causing the difference in correspondence.

关键词： Kerr-AdS black hole black hole thermodynamics phase transition of black hole

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Multi-layer multi-pass friction rolling additive manufacturing of Al alloy:Toward complex large-scale high-performance components

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 425-438页

作者： Haibin Liu Run Hou Chenghao wu Ruishan Xie Shujun Chen College of Mechanical&Energy Engineering Beijing University of TechnologyBeijing 100124China Chongqing Research Institute of Beijing University of Technology Chongqing 401121China

At present,the emerging solid-phase friction-based additive manufacturing technology,including friction rolling additive man-ufacturing(FRAM),can only manufacture simple single-pass *** this study,multi-layer multi-pass FRAM-deposited alumin-um alloy samples were successfully prepared using a non-shoulder tool *** material flow behavior and microstructure of the over-lapped zone between adjacent layers and passes during multi-layer multi-pass FRAM deposition were studied using the hybrid 6061 and 5052 aluminum *** results showed that a mechanical interlocking structure was formed between the adjacent layers and the adja-cent passes in the overlapped center *** friction and rolling of the tool head led to different degrees of lateral flow and plastic deformation of the materials in the overlapped zone,which made the recrystallization degree in the left and right edge zones of the over-lapped zone the highest,followed by the overlapped center zone and the non-overlapped *** tensile strength of the overlapped zone exceeded 90%of that of the single-pass deposition *** is proved that although there are uneven grooves on the surface of the over-lapping area during multi-layer and multi-pass deposition,they can be filled by the flow of materials during the deposition of the next lay-er,thus ensuring the dense microstructure and excellent mechanical properties of the overlapping *** multi-layer multi-pass FRAM deposition overcomes the limitation of deposition width and lays the foundation for the future deposition of large-scale high-performance components.

关键词： aluminum alloy additive manufacturing solid-state friction stir welding multi-layer multi-pass

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Stem-leaf saponins of Panax notoginseng attenuate experimental Parkinson's disease progression in mice by inhibiting microglia-mediated neuroinflammation via P2Y2R/PI3K/AKT/NFκB signaling pathway

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Chinese Journal of Natural Medicines 2025年第1期23卷 43-53页

作者： Hui wu Chenyang Ni Yu Zhang Yingying Song Longchan Liu Fei Huang Hailian Shi Zhengtao Wang Xiaojun wu Shanghai Key Laboratory of Compound Chinese Medicines The Ministry of Education (MOE) Key Laboratory for Standardization of Chinese Medicines Institute of Chinese Materia Medica The MOE Innovation Centre for Basic Medicine Research on Qi-Blood TCM Theories Shanghai University of Traditional Chinese Medicine

Stem-leaf saponins from Panax notoginseng(SLSP) comprise numerous PPD-type saponins with diverse pharmacological properties; however, their role in Parkinson's disease(PD),characterized by microglia-mediated neuroinflammation, remains unclear. This study evaluated the effects of SLSP on suppressing microglia-driven neuroinflammation in experimental PD models, including the 1-methyl-4-phenylpyridinium(MPTP)-induced mouse model and lipopolysaccharide(LPS)-stimulated BV-2 microglia. Our findings revealed that SLSP mitigated behavioral impairments and excessive microglial activation in models of PD, including MPTP-treated mice. Additionally, SLSP inhibited the upregulation of inducible nitric oxide synthase(i NOS) and cyclooxygenase-2(COX2) and attenuated the phosphorylation of PI3K,protein kinase B(AKT), nuclear factor-κB(NFκB), and inhibitor of NFκB protein α(IκBα) both in vivo and in vitro. Moreover, SLSP suppressed the production of inflammatory markers such as interleukin(IL)-1β, IL-6, and tumor necrosis factor alpha(TNF-α) in LPS-stimulated BV-2cells. Notably, the P2Y2R agonist partially reversed the inhibitory effects of SLSP in LPStreated BV-2 cells. These results suggest that SLSP inhibit microglia-mediated neuroinflammation in experimental PD models, likely through the P2Y2R/PI3K/AKT/NFκB signaling pathway. These novel findings indicate that SLSP may offer therapeutic potential for PD by attenuating microglia-mediated neuroinflammation.

关键词： Microglia NFκB Neuroinflammation P2Y2 receptor Stem-leaf saponins of Panax Notoginseng

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A Verifiable Trust-Based CP-ABE Access Control Scheme for Cloud-Assisted Renewable Energy Systems

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Computers, Materials & Continua 2025年第1期82卷 1211-1232页

作者： Jiyu Zhang Kehe wu Ruomeng Yan Zheng Tian Yizhen Sun Yuxi wu Yaogong Guo Department of Control and Computer Engineering North China Electric Power UniversityBeijing102206China State Grid Information&Communication Company of Hunan Electric Power Corporation Changsha410118China State Grid Hunan Electric Power Corporation Chenzhou Power Supply Branch Chenzhou423000China

Renewable Energy Systems(RES)provide a sustainable solution to climate warming and environmental pollution by enhancing stability and reliability through status acquisition and analysis on cloud platforms and intelligent processing on edge servers(ES).However,securely distributing encrypted data stored in the cloud to terminals that meet decryption requirements has become a prominent research ***,managing attributes,including addition,deletion,and modification,is a crucial issue in the access control scheme for *** address these security concerns,a trust-based ciphertext-policy attribute-based encryption(CP-ABE)device access control scheme is proposed for RES(TB-CP-ABE).This scheme effectivelymanages the distribution and control of encrypted data on the cloud through robust attribute key *** introducing trust management mechanisms and outsourced decryption technology,the ES system can effectively assess and manage the trust worthiness of terminal devices,ensuring that only trusted devices can participate in data exchange and access sensitive ***,the ES system dynamically evaluates trust scores to set decryption trust thresholds,thereby regulating device data access permissions and enhancing the system’s *** validate the security of the proposed TB-CP-ABE against chosen plaintext attacks,a comprehensive formal security analysis is conducted using the widely accepted random oraclemodel under the decisional q-Bilinear Diffie-Hellman Exponent(q-BDHE)***,comparative analysis with other schemes demonstrates that the TB-CP-ABE scheme cuts energy/communication costs by 43%,and scaleswell with rising terminals,maintaining average latency below 50ms,ensuring real-time service *** proposed scheme not only provides newinsights for the secure management of RES but also lays a foundation for future secure energy solutions.

关键词： Access control renewable energy systems(RES) ciphertext-policy attribute-based encryption(CP-ABE) security

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Reflections on the Inflection Point in Network Development

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China Communications 2025年第1期22卷 1-6页

作者： wu Hequan Chinese Academy of Engineering Beijing 100088China

The development of communication networks is currently undergoing a period of *** paper illustrates this transformation from the growth rate of communication users,network bandwidth,and service *** also analyze the shift in the focus of network technology development from aspects such as information sources,mobile terminals,wireless channels,core networks,edge clouds,data perception,and artificial ***,we briefly outline the new paradigm for network research and development(R&D)in the intelligent era.

关键词： artificial intelligence mobile communication new R&D paradigm

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端羧基丁腈橡胶增韧改性酚醛树脂的化学结构及胶合性能

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林业工程学报 2024年第5期9卷 36-43页

作者：朱春锋田飞宇吴玉涛靳愿愿徐信武南京林业大学林业资源高效加工利用协同创新中心南京210037

酚醛(PF)树脂胶合强度高、耐水(湿)耐候性强、阻燃性能较好,但固化后的PF树脂呈现出高聚合度三维网络结构,脆性较高、韧性不足,胶层在外力特别是冲击载荷作用下易于产生裂纹并迅速扩展,导致胶层开裂甚至失效。针对PF树脂胶黏剂固化后脆... 详细信息

酚醛(PF)树脂胶合强度高、耐水(湿)耐候性强、阻燃性能较好,但固化后的PF树脂呈现出高聚合度三维网络结构,脆性较高、韧性不足,胶层在外力特别是冲击载荷作用下易于产生裂纹并迅速扩展,导致胶层开裂甚至失效。针对PF树脂胶黏剂固化后脆性大、韧性差的不足,探究引入端羧基丁腈橡胶(CTBN)对其增韧改性(添加量5%~25%)后试制杨木胶合板。通过傅里叶变换红外光谱、X射线衍射、固体核磁等方法分析表明,CTBN柔性链段不仅有效嵌入PF树脂固化体,而且通过活性端基(—COOH)与PF树脂羟甲基发生接枝反应。纳米压痕测试结果表明,随着CTBN添加量的增加,PF树脂固化体的硬度和杨氏模量均出现下降趋势,表明改性PF树脂固化体具有良好的韧性。胶合强度结果表明,当CTBN添加量为15%时,干胶合强度提升幅度最大,达到了110.5%;当CTBN添加量为5%时,湿胶合强度提升幅度最大,达到了48.33%。数字散斑结果表明,CTBN的加入有效减少了杨木胶合板受到外力作用时胶层应力集中的现象。研究结果证实了CTBN增韧PF树脂并提高木材胶合性能的理论和技术可行性。

关键词：酚醛树脂增韧改性端羧基丁腈橡胶纳米压痕

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Quantitative Effects of Velocity and Residual Pressure Level on Aerodynamic Noise of Ultra-High-Speed Maglev Trains

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Fluid Dynamics & Materials Processing 2025年第1期21卷 205-220页

作者： Lanxi Zhang Yuming Peng Yudong wu School of Mechanical Engineering Southwest Jiaotong UniversityChengdu610031China School of Intelligent Manufacturing Chengdu Technological UniversityChengdu610031China

The challenge of aerodynamic noise is a key obstacle in the advancement of low-pressure tube ultra-high-speed maglev transportation,demanding urgent *** study utilizes a broadband noise source model to perform a quantitative analysis of the aerodynamic noise produced by ultra-high-speed maglev trains operating in low-pressure ***,an external flow field calculation model for the ultra-high-speed maglev train is ***,numerical simulations based on the broadband noise source model are used to examine the noise *** impact of the train speed and pressure level on noise generation is investigated ***,a correlation formula is *** results reveal that the amplitude of sound source changes in the streamlined region of the head and tail cars of the train is large,and the amplitude of changes for the middle car is *** noise source strength increases with speed,with a quadrupole noise source becoming dominant when the train speed exceeds 600 km/*** a speed of 1000 km/h,the noise source intensity from the streamlined area at the rear of the train overcomes that at the ***,the noise source decreases as the pressure level in the tube *** the pressure level drops to 0.01 atm,the quadrupole noise source intensity of a train running at 600 km/h significantly weakens and falls below that of the dipole noise source.

关键词： Low-pressure tube aerodynamic noise train speed quantitative analysis

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基于改进经验模态分解的泄漏电流去噪方法

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电力科学与技术学报 2023年第6期38卷 115-122页

作者：陈小娣王俊雄安韵竹吴玉涛杨浩瀚山东理工大学电气与电子工程学院山东淄博255000 国网山东省电力公司泰安供电公司山东泰安271000 国网山东省电力公司潍坊供电公司山东潍坊261000

为了有效地监测金属氧化物避雷器的绝缘工况,提出一种基于改进经验模态分解的泄漏电流去噪方法。首先,依据泄漏电流波形和幅值的综合相似度对信号端点进行延拓以抑制端点效应,进而根据本征模态函数的平滑度和相关性的综合指标重构无噪... 详细信息

为了有效地监测金属氧化物避雷器的绝缘工况,提出一种基于改进经验模态分解的泄漏电流去噪方法。首先,依据泄漏电流波形和幅值的综合相似度对信号端点进行延拓以抑制端点效应,进而根据本征模态函数的平滑度和相关性的综合指标重构无噪声干扰的泄漏电流信号;然后,通过坐标下降法对权重参数进行动态修正和更新,保证重构信号的合理性和准确性;最后,通过仿真和实验验证所提方法可以有效去除泄漏电流信号中的噪声干扰,且能判定出异常监测值,符合工程的实际要求。

关键词：金属氧化物避雷器泄漏电流经验模态分解端点效应波形匹配坐标下降法

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