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MoS_(2)Lubricate‑Toughened MXene/ANF Composites for Multifunctional Electromagnetic Interference Shielding

Nano-Micro Letters 2025年第2期17卷 358-371页

作者： Jiaen Wang wei ming Longfu Chen Tianliang Song Moxi Yele Hao Zhang Long Yang Gegen Sarula Benliang Liang Luting Yan Guangsheng Wang School of Physical Science and Engineering Beijing Jiaotong UniversityBeijing 100044People’s Republic of China Key Laboratory of Bio‑Inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191People’s Republic of China

The design and fabrication of high toughness electromagnetic interference(EMI)shielding composite films with diminished reflection are an imperative task to solve electromagnetic pollution *** MXene/ANF(aramid nanofibers)–MoS_(2)composite films with nacre-like layered structure here are fabricated after the introduction of MoS_(2)into binary MXene/ANF composite *** introduction of MoS_(2)fulfills an impressive“kill three birds with one stone”improvement effect:lubrication toughening mechanical performance,reduction in secondary reflection pollution of electromagnetic wave,and improvement in the performance of photothermal *** the introduction of MoS_(2)into binary MXene/ANF(mass ratio of 50:50),the strain to failure and tensile strength increase from 22.1±1.7%and 105.7±6.4 MPa and to 25.8±0.7%and 167.3±9.1 MPa,*** toughness elevates from 13.0±4.1 to 26.3±0.8 MJ m^(−3)(~102.3%)*** the reflection shielding effectiveness(SE_(R))of MXene/ANF(mass ratio of 50:50)decreases~10.8%.EMI shielding effectiveness(EMI SE)elevates to 41.0 dB(8.2–12.4 GHz);After the introduction of MoS_(2)into binary MXene/ANF(mass ratio of 60:40),the strain to failure increases from 18.3±1.9%to 28.1±0.7%(~53.5%),the SE_(R)decreases~22.2%,and the corresponding EMI SE is 43.9 *** MoS_(2)also leads to a more efficient photothermal conversion performance(~45 to~55℃).Additionally,MXene/ANF–MoS_(2)composite films exhibit excellent electric heating performance,quick temperature elevation(15 s),excellent cycle stability(2,2.5,and 3 V),and long-term stability(2520 s).Combining with excellent mechanical performance with high MXene content,electric heating performance,and photothermal conversion performance,EMI shielding ternary MXene/ANF–MoS_(2)composite films could be applied in many industrial *** work broadens how to achieve a balance between mechanical properties and versatility of composites in the case of high-function fillers.

关键词： MXene-MoS_(2) Lubrication toughening EMI shielding Photothermal conversion Electric heating performance

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Pitch control strategy before the rated power for variable speed wind turbines at high altitudes

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Journal of Hydrodynamics 2019年第2期31卷 379-388页

作者： ming-wei Ge wei-ming Ke Hong-xia Chen School of Renewable Energy North China Electric Power UniversityBeijingl 02206China School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing 102206China

The wind turbines in the world's highest wind farm with an altitude of over 4 000 m in Naqu county of China were put into operation in *** with the wind turbines at lower altitudes,the rated wind speed of these wind turbines are much larger,and the corresponding tip-speed ratio at the rated power reduces significantly due to the lower air ***,the power coefficient at the point of the rated power is decreased to a rather low *** improve the performance of the wind turbines at very high altitudes,this paper proposes a new pitch control strategy for variable speed wind turbines at the constant-speed phase,especially at the rated-speed phase before the rated power is *** is shown that the new pitch control strategy works very well for the wind farms at very high altitude and with low air density,with the catch of the wind energy enhaneed and the aerodynamic loads significantly reduced.

关键词： Wind turbine pitch control strategy high altitudes

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Stochastic optimal control of cable vibration in plane by using axial support motion

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Acta Mechanica Sinica 2011年第4期27卷 578-586页

作者： ming Zhao wei-Qiu Zhu Department of Mechanics State Key Laboratory of Fluid Power Transmission and Control Zhejiang University 310027 Hangzhou China

A stochastic optimal control strategy for a slightly sagged cable using support motion in the cable axial direction is proposed. The nonlinear equation of cable motion in plane is derived and reduced to the equations for the first two modes of cable vibration by using the Galerkin method. The partially averaged Ito equation for controlled system energy is further derived by applying the stochastic averaging method for quasi-non-integrable Hamiltonian systems. The dynamical programming equation for the controlled system energy with a performance index is established by applying the stochastic dynamical programming principle and a stochastic optimal control law is obtained through solving the dynamical programming equation. A bilinear controller by using the direct method of Lyapunov is introduced. The comparison between the two controllers shows that the proposed stochastic optimal control strategy is superior to the bilinear control strategy in terms of higher control effectiveness and efficiency.

关键词： Stay cable Active control - Stochastic optimalcontrol Dynamical programming principle

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术后腹腔粘连形成机制及间充质干细胞外泌体的治疗前景

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中国组织工程研究 2025年第1期29卷 147-155页

作者：张兴洲魏明董国强杜为罗依雯张楠天津市南开医院胃肠外科天津市300100 天津市南开医院妇产科天津市300100 天津市血液细胞治疗技术企业重点实验室天津市300100 天津医科大学临床学院天津市300270

背景:术后腹腔粘连的形成是一个复杂的过程,预防术后粘连是临床上亟待解决的问题。目的:旨在从细胞及分子水平分析粘连的发生机制,为间充质干细胞外泌体预防和治疗粘连提供理论依据。方法:以“腹腔粘连,盆腔粘连,术后粘连,上皮间充质转... 详细信息

背景:术后腹腔粘连的形成是一个复杂的过程,预防术后粘连是临床上亟待解决的问题。目的:旨在从细胞及分子水平分析粘连的发生机制,为间充质干细胞外泌体预防和治疗粘连提供理论依据。方法:以“腹腔粘连,盆腔粘连,术后粘连,上皮间充质转化,间充质干细胞,干细胞外泌体,间充质干细胞外泌体”为中文检索词,以“Abdominal adhesion,pelvic adhesion,postoperative adhesion,epithelial mesenchymal transformation,mesenchymal stem cell,stem cell exosomes,mesenchymal stem cell exosomes”为英文检索词,检索PubMed、中国知网和中国生物医学文献数据库,筛选各数据库建库至2023年8月发表的术后腹腔粘连及间充质干细胞外泌体干预研究的相关文章,并进行系统的整理分析,最终纳入54篇文献进行综述。结果与结论:(1)任何腹膜炎症、机械损伤、组织缺血和异物植入等病理因素均可引起腹膜表面的损伤,引起术后腹腔粘连;腹腔粘连的形成过程包括腹膜间皮细胞修复、炎性反应、纤溶系统及凝血途径等过程的相互作用,涉及多种细胞因子及信号通路,包括Wnt/β-catenin通路能诱导纤维化和血管生成,并与转化生长因子β/Smads信号通路相互协同,能刺激成纤维细胞增殖,引起腹膜纤维化;同时,核转录因子kB信号通路上调细胞炎症因子的表达,促进成纤维细胞增生,组织纤维化的过程中发挥关键作用。(2)干细胞的旁分泌功能是目前以再生医学为基础的分子干预腹腔粘连的重要方向,可以参与作用于腹腔粘连中的多种复杂细胞因子及信号通路。(3)相对于传统治疗腹腔粘连的方法,间充质干细胞外泌体具有生物活性、使用安全、无需特殊培养和扩增、更低的免疫原性及较长的稳定性等优势,能通过多种途径引导一种正常的修复和愈合。(4)间充质干细胞外泌体在以往研究中均被证明可以参与调节粘连形成的上述各过程,在临床研究中显示出潜在的应用前景,但需要进一步临床研究以探索适当的间充质干细胞外泌体治疗方案,来解决临床转化的问题。

关键词：术后腹腔粘连上皮间质转化炎症反应纤溶系统间充质干细胞外泌体肿瘤坏死因子α 白细胞介素生长因子转化生长因子β/Smads信号通路 Wnt/β-catenin 核转录因子kB信号通路

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X-ray Emission Lines in GRB Afterglows: Evidence for a Two-component Jet Model

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Chinese Journal of Astronomy and Astrophysics 2005年第6期5卷 571-578页

作者： wei-Hong Gao Da-ming wei Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 National Astronomical Observatories Chinese Academy of Sciences Beijing 100012

X-ray emission lines have been observed in X-ray afterglows of several T-ray bursts （GRBs）. It is a major breakthrough for understanding the nature of the progenitors. It has been proposed that the X-ray emission lines can be well explained by the Geometry-Dominated models, but in these models the illuminat- ing angle is much larger than that of the collimated jet of the GRB. For GRB 011211, we have obtained an illuminating angle of about 0 - 45°, while the angle of the GRB jet is only 3.6°. So we propose that the outflow of GRBs with emission lines should have two distinct components： a wide component that illuminates the reprocessing material and produces the emission lines and a narrow one that produces the GRB. Observations show the energy for producing the emission lines is higher than that of the GRB. In this case, when the wide component dominates the afterglows, a bump should appear in the GRB afterglow. For GRB 011211, the bump should occur within 0.05 days of the GRB, which is obviously too early for the observation to catch it. Alongside the X-ray emission lines there should also be a bright emission component between the UV and the soft X-rays. These features can be tested by the Swift satellite in the near future.

关键词： gamma rays: bursts -- line: profiles -- ISM: jets and outflows -- supernovae: general

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General interaction quenches in a Luttinger liquid

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Communications in Theoretical Physics 2022年第1期74卷 134-141页

作者： You-ming wei Hantao Lu School of Physical Science and Technology&Key Laboratory for Magnetism and Magnetic Materials of the MoE Lanzhou UniversityLanzhou 730000China Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu ProvinceLanzhou UniversityLanzhouGansu 730000China

We discuss a general interaction quench in a Luttinger liquid described by a paired bosonic *** employing su(1,1)Lie algebra,the post-quench time-evolved wavefunctions are obtained analytically,from which the time evolution of the entanglement in momentum space can be *** note that depending on the choice of Bogoliubov quasiparticles,the expressions of wavefunctions,which describe time-evolved paired states,can take different *** correspondence between the largest entanglement eigenvalue in momentum space and the wavefunction overlap in quench dynamics is discussed,which generalizes the results of Dora et al(2016,***.117,010603).A numerical demonstration on an XXZ lattice model is presented via the exact diagonalization method.

关键词： quantum quench exact diagonalization Luttinger liquid XXZ model

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Dynamic mechanical behavior of ultra-high strength steel 30CrMnSiNi2A at high strain rates and elevated temperatures

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Journal of Iron and Steel Research International 2017年第7期24卷 724-729页

作者： Qiu-lin Niu wei-wei ming ming Chen Si-wen Tang Peng-nan Li College of Mechanical and Electrical Engineering Hunan University of Science and Technology Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material Hunan University of Science and Technology School of Mechanical Engineering Shanghai Jiao Tong University

During high speed machining in the field of manufacture,chip formation is a severe plastic deformation process including large strain,high strain rate and high *** the strain rate in high speed cutting process can be achieved to 105 s^（-1）.30CrMnSiNi2Asteel is a kind of important high-strength low-alloy structural steel with wide application *** the dynamic mechanical properties of30CrMnSiNi2Aunder the conditions of high strain rate and high temperature is necessary to construct the constitutive relation model for high speed *** dynamic compressive mechanical properties of30CrMnSiNi2Asteel were studied using split Hopkinson pressure bar（SHPB）tests at 30-700°C and3000-10000s^（-1）.The stress-strain curves of 30CrMnSiNi2Asteel at different temperatures and strain rates were investigated,and the strain hardening effect and temperature effect were *** results show that 30CrMnSiNi2Ahas obvious temperature sensitivity at 300°***,the flow stress decreased significantly with the increase of *** strain hardening effect of the material at high strain rate is not significant with the increase of *** strain rate hardening effect is obvious with increasing the *** to the experimental results,the established Johnson-Cook（J-C）constitutive model of 30CrMnSiNi2Asteel could be used at high strain rate and high temperature.

关键词： 30CrMnSiNi2A steel Dynamic mechanical behavior Split Hopkinson pressure bar High temperature High strain rate Ultra-high strength steel

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X-ray Flashes from Off-axis Nonuniform Jets

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Chinese Journal of Astronomy and Astrophysics 2004年第5期4卷 473-480页

作者： Zhi-Ping Jin Da-ming wei Purple Mountain Observatory Chinese Academy of SciencesNanjing 210008 National Astronomical Observatories Chinese Academy of SciencesBeijing 100012

It has been widely believed that the outflows in gamma-ray bursts are jetted and some jets may have structures like ∈(θ)∝θ-k. We check the possibility that X-ray flashes come from such jets. Both qualitative and quantitative analyses have shown that this model can reproduce most of the observational features of both X-ray flashes and gamma-ray bursts. Using the usual parameters of gamma-ray bursts, we have carried out numerical calculations for both uniform and nonuniform jets, of their fluxes, spectra and peak energies. It seems that nonuniform jets are more appropriate to these observational properties than uniform jets. We have also shown that in our model the observational ratio of gamma-ray bursts to X-ray flashes is about a few units.

关键词： X-rays general-gamma rays bursts-ISM jets and outflows

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Research on the iterative method for model updating based on the frequency response function

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Acta Mechanica Sinica 2012年第2期28卷 450-457页

作者： wei-ming Li Jia-Zhen Hong Department of Engineering Mechanics Shanghai Jiaotong University200240 ShanghaiChina

Model reduction technique is usually employed in model updating process. In this paper, a new model updat- ing method named as cross-model cross-frequency response function （CMCF） method is proposed and a new iterative method associating the model updating method with the mo- del reduction technique is investigated. The new model up- dating method utilizes the frequency response function to avoid the modal analysis process and it does not need to pair or scale the measured and the analytical frequency re- sponse function, which could greatly increase the number of the equations and the updating parameters. Based on the traditional iterative method, a correction term related to the errors resulting from the replacement of the reduction ma- trix of the experimental model with that of the finite element model is added in the new iterative method. Comparisons be- tween the traditional iterative method and the proposed itera- tive method are shown by model updating examples of solar panels, and both of these two iterative methods combine the CMCF method and the succession-level approximate reduc- tion technique. Results show the effectiveness of the CMCF method and the proposed iterative method .

关键词： Model updating Model reduction Frequency response function Iteration

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Universality of slip avalanches in a ductile Fe-based bulk metallic glass

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Journal of Iron and Steel Research International 2017年第4期24卷 366-371页

作者： Jiao-jiao Li Jun-wei Qiao Karin A.Dahmen wei-ming Yang Bao-long Shen ming-wei Chen Laboratory of Applied Physics and Mechanics of Advanced Materials College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024ShanxiChina Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024ShanxiChina Department of Physics University of Illinois at Urbana-ChampaignIllinois 61801USA State Key Laboratory for Geomechanics and Deep Underground Engineering School of Mechanics and Civil EngineeringChina University of Mining and TechnologyXuzhou 221116JiangsuChina School of Materials Science and Engineering Southeast UniversityNanjing 211189JiangsuChina Advanced Institute for Materials Research Tohoku UniversitySendal 980-8577Japan

Intermittent serrated flows of a novel ductile Fe60Ni20P13C7 bulk metallic glass（BMG）at variant strain rates were investigated by statistics *** and clutter distribution of slip-avalanche magnitudes are displayed during stable plastic flows at strain rates of 2×10-4 s-1 and 5×10-5 s-1,respectively,which means that serration behavior depends on the strain ***,the remarkable agreement between measured slip-avalanche magnitudes and the scaling behavior,i.e.a universal complementary cumulative distribution function（CCDF）predicted by mean-field theory（MFT）model,indicates that the plasticity of the present Fe-based BMGs can be tuned by imposed strain rates：Smax^6）ε-λ.This tuned plasticity is elucidated with expended free-volume ***,the scaling behavior of serrated flows for other strain rates can be predicted as well.

关键词： Bulk metallic glass Slip avalanche Plasticity Mean-field theory model Strain rate

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