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A novel active-passive protection strategy endows carbonyl iron with excellent intelligent anti-corrosion and microwave absorption dual functional characteristics

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Nano Research 2025年第1期18卷 487-500页

作者： Wei tian Quanyuan Feng Linbo Zhang Yinfan Liu Xian Jian Longjiang Deng Institute of Microelectronics School of Information Science and TechnologySouthwest Jiaotong UniversityChengdu 611756China National Engineering Researching Centre of Electromagnetic Radiation Control Materials Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of EducationState Key Laboratory of Electronic Thin Films and Integrated DevicesSchool of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China The Yangtze Delta Region Institute(Huzhou)&School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaHuzhou 313001China

Carbonyl iron absorbers(CI)face significant challenges in practical applications,such as corrosion,interface bonding failure,detachment,and high maintenance ***,we have developed intelligent self-healing technology based on proactive/passive mechanisms via in situ synthesis of self-healing factors(polydopamine/benzotriazole(PDA/BTA))and physical barrier layers(SiO_(2)/1,1,1,3,3,3-hexamethyl disilazane,SiO_(2)/HMDS)to enhance corrosion resistance,while also being compatible with efficient microwave absorption *** unique multiscale structure gives full play to the utilization of the roles of each functional layer,including the intelligent self-healing features of PDA/BTA,physical shielding and spatial confinement characteristics of SiO_(2)/HMDS,and magnetic-dielectric synergistic mechanism resulted from the good impedance matching characteristics,the conduction loss,the interfacial polarization loss and natural *** asfabricated composites achieved an exceptional minimum reflection loss value of-55.4 dB at 10.7 GHz and the effective absorption band of 7.6 ***,it still exhibits obvious self-healing and corrosion resistance characteristics after 360 h corrosion treatment,ascribed to the self-healing mechanism of PDA/BTA and the blocking intervention effect of SiO_(2)/*** work is considered to pave the way for the synthesis of high-performance magnetic absorbers,especially in enhancing their intelligent self-healing ability in corrosive environments.

关键词： microwave absorption intelligent self-healing technology carbonyl iron multiscale structure magneticdielectric synergistic mechanism

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A Fractional Orlicz–Sobolev Poincaré Inequality in John Domains

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Acta Mathematica Sinica,English Series 2021年第6期37卷 854-872页

作者： tian LIANG Department of Mathematics Beihang UniversityBeijing 100191P.R.China

Let n≥2,β∈(0,n)andΩ■R^(n) be a bounded *** thatφ:[0,∞)→[0,∞)is a Young function which is doubling and satisfies sup x>0∫^(1)_(0)φ(tx)/φ(x)dt/t^(β+1)<∞.If Ω is a John domain,then we show that it supports a(φ^(n/(n-β)),φ)_(β)-Poincaré***,assume thatΩis simply connected domain when n=2 or a bounded domain which is quasiconformally equivalent to some uniform domain when n≥***Ωsupports a((φ^(n/(n-β)),φ)β-Poincaréinequality,then we show that it is a John domain.

关键词： Intrinsic fractional Orlicz-Sobolev John domains

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Improved distinguisher search techniques based on parity sets

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Science China(Information Sciences) 2020年第3期63卷 285-287页

作者： Xiaofeng XIE tian tian National Digital Switching System Engineering & Technological Research Center

Dear editor,Division property was a technique proposed by Todo at EUROCRYPT 2015 to search integral distinguishers against block ciphers [1]. Todo [2] applied this technique to perform structural evaluation against both the Feistel and the SPN constructions and attacked the full MISTY1. Subsequently, many improved techniques based on the division property were proposed [3,4]. At

关键词： Improved distinguisher search techniques based on parity sets

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An improved thermometer for intermediate-mass fragments

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Nuclear Science and Techniques 2016年第6期27卷 13-16页

作者： tian-tian Ding Chun-Wang Ma Institute of Particle and Nuclear Physics Henan Normal University

An improved thermometer(TIB) is proposed for intermediate-mass fragments via the difference between isobaric yield *** residual free energy of three isobars is replaced by that of the binding *** measured fragments in the 140 A MeV ^(40,48) Ca +9Be(181Ta) and^(58,64) Ni +~9Be(^(181)Ta) reactions are analyzed to obtain T_(IB) ranging from 0.6 to 3.5 Me *** suggested to be a direct determination of temperature avoiding the fitting procedure.

关键词：温度计中间质量碎片中等质量碎片反应分析直接测定拟合程序等压线 MeV

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Immediate or delayed repair of pelvic fracture urethral disruption defects in young boys： twenty years of comparative experience

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Chinese Medical Journal 2014年第19期127卷 3418-3422页

作者： Qu Yanchao Zhang Weiping Sun Ning Huang Chengru tian Jun Li Minglei, Song hongcheng Li Ning Department of Urology Beijing Children's Hospital Capital MedicalUniversity Beijing 100045 China

Background The treatment of the patient with pelvic fracture urethral disruption defects （PFUDD） remains controversial especially in pediatric urology. Debate continues in regarding the advisability of immediate repair versus delayed repair. The aim of this study was to analyze our experience in the outcomes of immediate and delayed repair of pelvic fracture urethral distraction defects in young boys. Methods We retrospectively reviewed the records of 210 boys with posterior urethral disruption after pelvic injury between 1992 and 2012. Exclude partial urethral injury, a total of 177 cases acquired follow-up. All patients were evaluated by plain radiography, ultrasonography, or a computed tomography scan to assess the conditions of the upper urinary tract and to exclude other severe injuries. Data on 35 patients who underwent immediate repair were compared to those on 142 treated with delayed urethroplasty. After the diagnosis of a complete urethral injury, the immediate repair group underwent urethroplasty via the perineal approach if the patient＇s condition was stable, and serious complications were treated. The delayed repair group patients with the delayed urethroplasty average 6 months after injury. All patients were evaluated postoperatively for urethral strictures, incontinence and impotence. The patients were assessed by uroflowmetry and renal ultrasonography with evaluation of the postmictional residue every 3 months during the first year of follow-up. We assessed incontinence and erectile function by questioning the parents or the children themselves. Statistical analysis with the chi-square test was performed using SPSS software. Results One hundred and seventy-seven patients were followed up with an average 58 months （range 6 to 192 months）. Strictures developed in 3 （9%） patients in immediate repair group; two recluired direct visual internal urethrotomy （DVIU）, the other patient required dilatation. Strictures developed in 11.9% of the delayed repair g

关键词： injury urethral anastomosis children

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Bandgap formation and low-frequency structural vibration suppression for stiffened plate-type metastructure with general boundary conditions

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Chinese Journal of Aeronautics 2023年第10期36卷 210-228页

作者： tian ZHAO Zhichun YANG Yanlong XU Wei tian School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China

Metastructures with unique mechanical properties have shown attractive potential application in vibration and noise ***,most of the metastructures deal with the vibration bandgap properties of infinite structures without considering specific boundary condition and dynamic behaviors,which cannot be directly applied to the engineering *** this research,we design a Stiffened Plate-type Metastructure(SPM)composed of a plate with periodic stiffeners and cantilever beam-type resonators subjected to general boundary conditions for low-frequency vibration *** effects of boundary conditions and the number and orientation of the stiffeners on Locally Resonant(LR)type bandgap properties in SPM are further *** analytical modeling framework is developed to predict the bandgap formations and vibration behaviors of SPMs in finite-size *** governing equations of the SPM reinforced by various arrangements of stiffeners are derived based on the first-order shear deformation theory and Hamilton’s principle,and a Fourier series combined with auxiliary functions is employed to satisfy the arbitrary boundary *** element analysis and experimental investigations of vibration behaviors for the SPM are carried out to validate the accuracy and reliability of the present analytical *** practical designs of the SPMs with specific boundary conditions,it is found that there exist optimal numbers of stiffeners and resonators which can produce the significant LR-type bandgap ***,various arrangements of stiffeners and resonators are explored for different boundary conditions by breaking the requirement of spatially *** is shown that for the designed SPM,the vibration modes of its host structure should be considered to widen the frequency range in which the resonators transfer and store energy,and hence improve the performance of low-frequency vibration *** present work can pro

关键词： Bandgap Locally resonant Metastructure Stiffened plate Vibration suppression

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Science China Materials 2018年第1期61卷 127-128页

作者： Yongjun tian State Key Laboratory of Metastable Materials Science and Technology Yanshan University

When a metal is subject to cyclic loading with cyclic stress values much lower than its tensile strength,fatigue occurs due to accumulative and irreversible damages developed in the microstructure,causing service failure of the metal workpiece or even fatal disaster in the worst *** develop materials with higher fatigue limit and longer fatigue life relies on reducing or suppressing

关键词： Rise of correlated dislocations in nanotwinned metals against fatigue

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基于SBAS-InSAR和光学遥感的天津市北部山区潜在滑坡识别研究

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灾害学 2025年第1期40卷 30-35页

作者：王勇邢振涛李锁闫勇司甜天津城建大学地质与测绘学院天津300384 天津市地质工程勘测设计院有限公司天津300191

以天津市北部山区为研究对象,开展潜在滑坡识别研究,利用差分干涉测量短基线集时序分析技术(SBAS-InSAR)处理2018-01—2022-08的56景Sentinel-1A数据,并结合2018—2022年的Landsat8光学遥感影像,分析形变与光学遥感影像特征以及NDVI,筛... 详细信息

以天津市北部山区为研究对象,开展潜在滑坡识别研究,利用差分干涉测量短基线集时序分析技术(SBAS-InSAR)处理2018-01—2022-08的56景Sentinel-1A数据,并结合2018—2022年的Landsat8光学遥感影像,分析形变与光学遥感影像特征以及NDVI,筛选出潜在滑坡区域。研究结果表明:基于SBAS-InSAR技术识别的天津北部山区的形变较大区域有20处,使用光学遥感影像结合各发育环境要素进行处理确定的区域有19处,其中5处经两种技术确认为滑坡隐患,通过对该5处沉降信息进行识别分析,该5处区域最大年形变速率可达-12 mm/a,需要进行重点监测预警,使用两种技术结合对滑坡隐患区域进行识别可以有效地提高识别准确度,为天津北部山区灾害监测提供新的方式。

关键词：潜在滑坡 SBAS-InSAR 光学遥感影像天津市北部山区

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Link Prediction in Brain Networks Based on a Hierarchical Random Graph Model

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Tsinghua Science and Technology 2015年第3期20卷 306-315页

作者： Yanli Yang Hao Guo tian tian Haifang Li School of Computer Science and Technology Taiyuan University of Technology

Link prediction attempts to estimate the likelihood of the existence of links between nodes based on available brain network information, such as node attributes and observed links. In response to the problem of the poor efficiency of general link prediction methods applied to brain networks, this paper proposes a hierarchical random graph model based on maximum likelihood estimation. This algorithm uses brain network data to create a hierarchical random graph model. Then, it samples the space of all possible dendrograms using a Markov-chain Monte Carlo algorithm. Finally, it calculates the average connection probability. It also employs an evaluation index. Comparing link prediction in a brain network with link prediction in three different networks （Treponemapallidum metabolic network, terrorist networks, and grassland species food webs） using the hierarchical random graph model, experimental results show that the algorithm applied to the brain network has the highest prediction accuracy in terms of AUC scores. With the increase of network scale, AUC scores of the brain network reach 0.8 before gradually leveling off. In addition, the results show AUC scores of various algorithms computed in networks of eight different scales in 28 normal people. They show that the HRG algorithm is far better than random prediction and the ACT global index, and slightly inferior to local indexes CN and LP. Although the HRG algorithm does not produce the best results, its forecast effect is obvious, and shows good time complexity.

关键词： brain network link prediction hierarchical random graph maximum likelihood estimation method

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Higher-order Optimality Conditions and Duality for Approximate Solutions in Non-convex Set-valued Optimization

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Acta Mathematicae Applicatae Sinica 2019年第3期35卷 620-628页

作者： Guo-lin YU tian-tian GONG North Minzu University

This paper deals with higher-order optimality conditions and duality theory for approximate solutions in vector optimization involving non-convex set-valued ***,under the assumption of near cone-subconvexlikeness for set-valued maps,the higher necessary and sufficient optimality conditions in terms of Studniarski derivatives are derived for local weak approximate minimizers of a set-valued optimization ***,applications to Mond-Weir type dual problem are presented.

关键词： studniarski derivatives optimality conditions set-valued optimization problem efficiency duality

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