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Experimental study of the pinned double rectangular tube assembled buckling-restrained brace

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2017年第1期18卷 20-32页

作者： Zi-qin JIANG yan-lin guo Ai-lin ZHANG Chao DOU Cai-xia ZHANG College of Architecture and Civil Engineering Beijing University of Technology Beijing 100124 China Department of Civil Engineering Tsinghua University Beijing 100084 China Beijing Engineering Research Center of High-rise and Large-span Prestressed Steel Structure Beijing University of Technology Beijing 100124 China School of Civil Engineering Beijing Jiaotong University Beijing 100044 China Beijing Key Laboratory of Advanced Manufacturing Technology Beijing University of Technology Beijing 100124 China

In this study, seven pinned double-rectangular tube assembled buckling-restrained brace （DRT-ABRB） specimens were experimentally charaeterised by means of an axial cyclic test. The core member of the specimens was a single flat-plate. Two rectangular tubes were assembled using high strength bolts to form an external restraining member. Each rectangular tube was composed of an external steel channel and a cover plate. A gap or thin rubber filler was set between the core and the external restraining member to form an unbonded layer. The influence of several design parameters on the failure mode and energy dissipation capacity of the ABRB was investigated, including the height of the core wing plate, thickness of the external cover plate, and height of the external channel flange. This experimental study demonstrated that a local pressure-bearing failure at the end of the external member arises when the external cover plate is too thin or if the end construction detail is unreasonable. When the end rotations of the DRT-ABRB were restricted, the hysteretic performance was shown to be superior to that of a pure pinned DRT-ABRB. Finally, all the tested DRT-ABRBs exhibited excellent energy dissipation performance which amply satisfied existing regulation requirements.

关键词： Double-rectangular tube assembled buckling-restrained brace (DRT-ABRB) Construction detail Hysteretic behaviour Failure mode High strength bolt

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内核外伸铰接防屈曲支撑设计理论研究.第二部分:数值验证（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2015年第10期16卷 793-804页

作者： Zi-qin JIANG yan-lin guo Jing-zhong TONG Xing YUAN College of Architecture and Civil Engineering Beijing University of Technology Department of Civil Engineering Tsinghua University

目的:本文旨在对系列文章第一部分所得到的理论推导结果进行相应的有限元数值验证,同时对内核单波变形下的支撑构件进行参数分析。方法:采用通用有限元软件ABAQUS建立六个防屈曲支撑模型对内核单波变形下理论推导公式进行校核;并对理论... 详细信息

目的:本文旨在对系列文章第一部分所得到的理论推导结果进行相应的有限元数值验证,同时对内核单波变形下的支撑构件进行参数分析。方法:采用通用有限元软件ABAQUS建立六个防屈曲支撑模型对内核单波变形下理论推导公式进行校核;并对理论公式进行参数分析,考察外围构件抗弯刚度、间隙大小、内核构件厚度、内核构件宽厚比、铰接接头长度、外围约束构件初始缺陷、外围构件长度、内核约束加强段长度及内核加强段翼板高度等9个参数对内核挤压力及外围构件受力影响;最后通过对12个防屈曲支撑进行数值模拟,验证支撑设计理论的合理性。结论:该理论设计公式能较好地预测支撑的破坏情况及内力发展情况,具有较强的安全性和较广的适用性,为铰接防屈曲支撑的使用推广奠定理论基础。

关键词：防屈曲支撑内核单波整体变形挤压力分布内核构件加强段设计准则精细有限元

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THE STRESS INTENSITY FACTORS FOR SEMI-INFINITE STIFFENED PLATES WITH EDGE CRACKS

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Chinese Journal of Aeronautics 1993年第4期 261-268页

作者： Huang Wei-yang,yan guo-lin (Aircraft Engineering Department,Nanjing University of Aeronautics and Astronautics,Nanjing,China,210016)

The stress intensity factors are obtained for a semi-infinite plate with an edge crackby using the method of alternative iteration and the combination of complex stress functionscontaining unknown coefficients and variational principles. In the analysis, the influencesof the rivet flexibility and the condition of the broken edge stiffener are taken intoconsideration. For some cases, the variations of non-dimensional stress intensity factorswith the crack length are given.

关键词： THE STRESS INTENSITY FACTORS FOR SEMI-INFINITE STIFFENED PLATES WITH EDGE CRACKS EDGE SEMI

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以UV胶为纤芯本底的CdSe/ZnS量子点光纤光致荧光光谱的传光特性

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光子学报 2011年第6期40卷 888-893页

作者：程成林彦国严金华浙江工业大学激光与光电子技术研究所杭州310023

制备了一种以紫外(UV)固化胶为纤芯本底的CdSe/ZnS量子点掺杂光纤.通过测量不同掺杂浓度和光纤长度下的量子点光致荧光光谱,得到了荧光峰值强度与量子点掺杂光纤浓度和长度的关系,确定了UV胶纤芯本底下的量子点的吸收系数、合适的掺杂... 详细信息

制备了一种以紫外(UV)固化胶为纤芯本底的CdSe/ZnS量子点掺杂光纤.通过测量不同掺杂浓度和光纤长度下的量子点光致荧光光谱,得到了荧光峰值强度与量子点掺杂光纤浓度和长度的关系,确定了UV胶纤芯本底下的量子点的吸收系数、合适的掺杂浓度和光纤长度.结果表明:UV胶在光纤中具有吸收小、收缩率低、与石英光纤包层折射率匹配、性能稳定等特点,是一种比较理想的实验室制备量子点光纤纤芯本底的材料.

关键词： CdSe/ZnS量子点 UV胶量子点掺杂光纤光致荧光光谱

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3-D profile measurement for complex micro-structures

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Optoelectronics Letters 2005年第3期1卷 205-208页

作者： HU Chun-guang HU Xiao-dong XU lin-yan guo Tong HU Xiao-tang State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University Tianjin 300072 China

Micro-structures 3-D profile measurement is an important measurement content for research on micro-machining and characterization of micro-dimension. In this paper,a new method involved 2-D structure template, which guides phase unwrapping,is proposed based on phase-shifting microscopic *** is fit not only for static measurement, but also for dynamic measurement,especially for motion of MEMS devices.3-D profile of active comb of micro-resonator is obtained by using the *** theoretic precision in out-of-plane direction is better than 0.5 *** in-plane theoretic precision in micro-structures is better than 0.5 μ*** at the edge of micro-structures,it is on the level of micrometer mainly caused by imprecise edge ***,its disadvantages and the following development are discussed.

关键词：微观结构光检测技术三维测量干涉测量

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The linear self-attracting diffusion driven by the weighted-fractional Brownian motion II: The parameter estimation

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Science China Mathematics 2025年

作者： Litan yan Rui guo Wenyi Pei Department of Statistics College of Science Donghua University School of Statistics and Mathematics Zhejiang Gongshang University

Let Ba,bbe a weighted-fractional Brownian motion with Hurst indexes a and b such that a>-1and 0≤b<1∧（1+a）.In this paper,we consider the linear self-attracting diffusion ■ interacting diffusion (see Cranston and L...

Let Ba,bbe a weighted-fractional Brownian motion with Hurst indexes a and b such that a>-1and 0≤blinear self-attracting diffusion ■ interacting diffusion (see Cranston and Le Jan （1995）).Under the continuous observation,we study asymptotic ■ converges in distribution to the sum of the chi-square random variable with 1 degree of freedom and the random variable Z1a,b.

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Analysis of Micromechanical Properties at the Interface of Pre-wet SBS Modified Asphalt Mixture Based on Molecular Simulation Technology

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 103-113页

作者： CHEN Wuxing CHEN Shuang YU yan ZHANG Jiangyi XU Haiyang guo Wei School of Mines China University of Mining and TechnologyXuzhou 221000China College of Construction Engineering Jilin Uni-versityChangchun 130026China

The pre-wetting of aggregate surface is a means to improve the interface performance of SBS modified asphalt and *** effect of pre-wetting technology on the interaction between SBS modified asphalt and aggregate was analyzed by molecular dynamics *** diffusion coefficient and concentration distribution of SBS modified asphalt on aggregate surface are *** simulation results show that the diffusion coefficient of the aggregate surface of SBS modified asphalt is increased by 47.6%and 70.5%respectively after 110#asphalt and 130#asphalt are *** concentration distribution of SBS modified asphalt on the aggregate surface after pre-wetting is more *** to the results of interface energy calculation,the interface energy of SBS modified bitumen and aggregate can be increased by about 5%after *** to the results of molecular dynamics simulation,the pre-wetting technology can effectively improve the interface workability of SBS modified bitumen and aggregate,so as to improve the interface performance.

关键词： pre-wet oil-stone interface interface interaction interface mechanics molecular dynamics simulation

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CaH2-promoted activity of Ni-carbonate interface for CO2 methanation

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Journal of Energy Chemistry 2025年第1期100卷 522-532页

作者： Jin-Peng Wang guo-Cui Mao Hui-lin Jiang Bao-Xia Dong Yun-Lei Teng School of Chemistry and Chemical Engineering Yangzhou University

Transition metal-carbonate interfaces often act as active sites in heterogeneous catalytic *** interface between transition metal and metal carbonate exhibits a dynamic equilibrium during the CO2hydrogenation reaction,involving surface carbonate hydrogenation and ***,there have been few reports on engineering the activity of the interface between transition metal and alkaline earth metal carbonate for catalytic *** work demonstrated that the incorporation of CaH2in Ni/CaCO3enhances the CO2methanation activity of the *** CO2conversion for Ni/CaH2-CaCO3reached 68.5%at 400°C,which was much higher than that of the Ni/CaCO3（31.6%） and Ni/CaH2-CaO （42.4%） ***,the Ni/CaH2-CaCO3catalysts remained stable during the stability test for 24 h at 400°C and 8 *** research revealed that CaH2played a crucial role in promoting the activity of the Ni-carbonate interface for ***2could modify the electronic structure of Ni and tune the structural properties of CaCO3to generate medium basic sites （OH groups）,which are favorable for the activation of H2and ***-situ Fourier transform infrared spectroscopy （FTIR） analysis combined with density functional theory calculations demonstrated that CO2activation occurs at the hydroxyl group （OH） on the CaH2-modified Ni-carbonate surface,leading to the formation of CO3H****,our study has confirmed that CO2methanation over the Ni/CaH2-CaCO3catalysts proceeds via the formate pathway.

关键词： CO 2 methanation Metal hydride Ni catalysts Carbonate Metal-carbonate interface

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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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Maintaining moderate levels of hypochlorous acid promotes neural stem cell proliferation and differentiation in the recovery phase of stroke

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Neural Regeneration Research 2025年第3期20卷 845-857页

作者： lin-yan Huang Yi-De Zhang Jie Chen Hai-Di Fan Wan Wang Bin Wang Ju-Yun Ma Peng-Peng Li Hai-Wei Pu Xin-Yian guo Jian-Gang Shen Su-Hua Qi School of Medical Technology Xuzhou Key Laboratory of Laboratory DiagnosticsXuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Pharmacy Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina Department of Laboratory Medicine Branch Hospital of Huai’an First People’s HospitalHuai’anJiangsu ProvinceChina Department of Laboratory Medicine the Affiliated Hospital of Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Chinese Medicine The University of Hong KongHong Kong Special Administrative RegionChina

It has been shown clinically that continuous removal of ischemia/reperfusion-induced reactive oxygen species is not conducive to the recovery of late ***,previous studies have shown that excessive increases in hypochlorous acid after stroke can cause severe damage to brain *** previous studies have found that a small amount of hypochlorous acid still exists in the later stage of stroke,but its specific role and mechanism are currently *** simulate stroke in vivo,a middle cerebral artery occlusion rat model was established,with an oxygen-glucose deprivation/reoxygenation model established in vitro to mimic *** found that in the early stage(within 24 hours)of ischemic stroke,neutrophils produced a large amount of hypochlorous acid,while in the recovery phase(10 days after stroke),microglia were activated and produced a small amount of hypochlorous ***,in acute stroke in rats,hypochlorous acid production was prevented using a hypochlorous acid scavenger,taurine,or myeloperoxidase inhibitor,4-aminobenzoic acid *** results showed that high levels of hypochlorous acid(200μM)induced neuronal apoptosis after oxygen/glucose deprivation/***,in the recovery phase of the middle cerebral artery occlusion model,a moderate level of hypochlorous acid promoted the proliferation and differentiation of neural stem cells into neurons and *** suggests that hypochlorous acid plays different roles at different phases of cerebral ischemia/reperfusion *** levels of hypochlorous acid(5 and 100μM)promoted nuclear translocation ofβ-*** transfection of single-site mutation plasmids,we found that hypochlorous acid induced chlorination of theβ-catenin tyrosine 30 residue,which promoted nuclear ***,our study indicates that maintaining low levels of hypochlorous acid plays a key role in the recovery of neurological function.

关键词： cell differentiation cerebral ischemia/reperfusion injury chlorination hypochlorous acid microglia neural stem cell neurogenesis nuclear translocation stroke β-catenin

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