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独立式桥墩防撞结构防撞性能研究

桥梁建设 2024年第1期54卷 82-87页

作者：赵健郑仕豪孙建鹏安路明西安建筑科技大学土木工程学院陕西西安710055 中铁建大桥工程局集团南方工程有限公司广东广州511458

为了解独立式桥墩防撞结构(由钢管混凝土立柱、钢横梁等结构组成)抵御船舶撞击的能力,并选取合适的结构方案,以广州明珠湾大桥为背景进行研究。采用显式动力软件LS-DYNA建立船舶与独立式桥墩防撞结构计算模型,分析立柱间距4.8 m且不设... 详细信息

为了解独立式桥墩防撞结构(由钢管混凝土立柱、钢横梁等结构组成)抵御船舶撞击的能力,并选取合适的结构方案,以广州明珠湾大桥为背景进行研究。采用显式动力软件LS-DYNA建立船舶与独立式桥墩防撞结构计算模型,分析立柱间距4.8 m且不设防撞套箱(方案1)、立柱间距6.7 m且不设防撞套箱(方案2)、立柱间距6.7 m且设防撞套箱(方案3)3种独立式桥墩防撞结构方案在3000 DWT船舶中心碰撞和偏心碰撞下的结构动力响应和船舶损伤。结果表明:在中心碰撞下,方案2较方案1能有效减少撞击时迎撞立柱的位移和轴向拉力峰值,提高了独立式桥墩防撞结构的防护性能和承载能力,方案3的防撞套箱能起到缓冲消能的作用;在偏心碰撞下,方案3防撞套箱的旋转能够使船舶远离桥墩,保护桥墩和拱脚下弦杆不受船舶的撞击作用,具有良好的导向能力。设防撞套箱的独立式桥墩防撞结构已在广州明珠湾大桥中应用。

关键词：独立式桥墩防撞结构防撞套箱船桥碰撞撞击力有限元法

高烈度震区大跨径中承式钢箱系杆拱桥减隔震技术研究

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振动与冲击 2024年第6期43卷 141-150,170页

作者：孙建鹏李进斌徐伟超王毅于超西安建筑科技大学土木工程学院西安710055 中国铁建大桥工程局集团有限公司天津300300 中国启源工程设计研究院有限公司西安710018

为了研究高强度地震作用下大跨径中承式钢箱系杆拱桥地震响应及减隔震技术,以西双版纳黎明大桥为工程背景,选取类似场地的实际地震动记录作为输入地震波,采用非线性时程分析法,研究支座类型及参数变化对拱桥结构的减隔震效果。结果表明... 详细信息

为了研究高强度地震作用下大跨径中承式钢箱系杆拱桥地震响应及减隔震技术,以西双版纳黎明大桥为工程背景,选取类似场地的实际地震动记录作为输入地震波,采用非线性时程分析法,研究支座类型及参数变化对拱桥结构的减隔震效果。结果表明:相比于普通支座,减隔震支座能大幅降低结构内力,但纵向位移有所增加,且摩擦摆支座的减隔震效果要强于铅芯橡胶支座;摩擦摆支座+黏滞阻尼器联合抗震体系能够有效降低纵向和横向位移,进一步能提升桥梁的抗震性能;对联合抗震体系进行参数敏感性分析可知:最佳的参数范围是:摩擦因数为0.04,曲率半径在3 200~4 200 mm,阻尼系数为6 000,阻尼指数在0.2~0.4;在最优抗震体系下,结构位移和内力均显著降低,最大减震率分别达到了75.3%和82.3%,表明该体系大幅提高了拱桥抵抗地震的能力,为同类桥梁减隔震设计提供参考。

关键词：高烈度大跨径中承式钢箱系杆拱桥有限元地震响应减隔震技术摩擦摆支座黏滞阻尼器

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基于多变量灰色模型的台风强度模拟方法

灾害学 2024年第1期39卷 17-22页

作者：孙建鹏郑仕豪马萧岗黄文锋西安建筑科技大学土木工程学院陕西西安710055 合肥工业大学土木与水利工程学院安徽合肥230009

随着台风全路径模拟技术的不断完善,全海域、大范围的台风危险性分析方法得到发展,然而强度模型的模拟精度不能满足需求。针对台风强度演变受多因素影响、动力关系复杂及强度变化随机性强的特点,基于多变量灰色模型对台风强度模拟方法... 详细信息

随着台风全路径模拟技术的不断完善,全海域、大范围的台风危险性分析方法得到发展,然而强度模型的模拟精度不能满足需求。针对台风强度演变受多因素影响、动力关系复杂及强度变化随机性强的特点,基于多变量灰色模型对台风强度模拟方法进行研究,并建立起台风多变量灰色强度模型。利用该模型还原了台风“山竹”的强度演变过程,同时对西北太平洋地区整体台风强度进行模拟及检验分析。结果表明:垂直风切变及垂直速度与台风强度的灰色关联度分别为0.771 8、0.745 1,显著高于其他3个环境因素;台风“山竹”强度模拟的后验差比值及小概率误差分别为0.349 1、0.960 8,达到了最高模拟精度;模型模拟所得西北太平洋地区整体的强度变化趋势及分布特征均与地区实际情况保持一致。

关键词：极值风速强度模型灰色关联度台风“山竹” 西北太平洋

尖牙反[牙合]矫治人字形和T形曲组合正畸弓丝矫治力建模

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仪器仪表学报 2024年第7期45卷 189-199页

作者：姜金刚李长鹏李风潇孙健鹏张永德哈尔滨理工大学先进制造智能化技术教育部重点实验室黑龙江哈尔滨150080 哈尔滨理工大学机器人技术及工程应用研究中心黑龙江哈尔滨150080

固定矫治技术是治疗牙齿反[牙合]最为有效的矫治手段,主要通过正畸弓丝释放的矫治力来达到反[牙合]矫治中的矫治空间预留、反[牙合]牙齿回收的目的。在牙齿反[牙合]畸形中,尖牙反[牙合]是最为常见的牙齿反[牙合]畸形,常使用人字形和T形... 详细信息

固定矫治技术是治疗牙齿反[牙合]最为有效的矫治手段,主要通过正畸弓丝释放的矫治力来达到反[牙合]矫治中的矫治空间预留、反[牙合]牙齿回收的目的。在牙齿反[牙合]畸形中,尖牙反[牙合]是最为常见的牙齿反[牙合]畸形,常使用人字形和T形组合曲关闭上颌牙列间隙。本文旨在正畸治疗前量化人字形和T形组合曲释放矫治力的情况,为正畸医师提供尖牙反[牙合]矫治的理论参考。分析人字形和T形组合曲的形变过程,将其形变过程分为弹性形变和弹塑性形变两类,并对两种形变下的矫治力微分方程进行了构建,将其释放的矫治力分为闭隙矫治力和倾覆矫治力两种,完成了人字形和T形组合曲理论模型的建立,其次对有限元仿真值与理论值的误差率进行计算,得到闭隙矫治力仿真值与理论值的误差率在0.43%~8.33%之间,倾覆矫治力的仿真值与理论值的误差率在2.13%~9.76%之间,搭建实验测量平台得到了闭隙矫治力实验值与理论值误差率为0%~9.30%、倾覆矫治力实验值与理论值的误差率为0%~9.76%,实验测量数据与理论值具有相同的非线性变化趋势,验证了人字形和T形组合曲理论预测模型的正确性,该模型能帮助医师在治疗前对正畸力进行详细的定量分析,从而为个性化治疗方案的制定提供依据,更好地满足患者需求。

关键词： T形曲人字形曲矫治力模型有限元仿真矫治力测量

Atomically thin defect-rich Ni-Se-S hybrid nanosheets as hydrogen evolution reaction electrocatalysts

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Nano Research 2020年第8期13卷 2056-2062页

作者： jianpeng sun Xiangting Hu Zhaodi Huang Tianxiang Huang Xiaokang Wang Hailing Guo Fangna Dai Daofeng sun College of Science School of Materials Science and EngineeringChina University of Petroleum(East China)Qingdao266580China School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan250100China The State Key Lab of Heavy Oil Processing College of Chemical EngineeringChina University of Petroleum(East China)Qingdao266580China

Facile design of economic-effective hydrogen evolution reaction(HER)catalysts with non-noble materials are promising for the production of renewable chemical ***-dimensional(2D)ultrathin transition metal dichalcogenides(TMDs)materials with large specific surface area and abundant catalytic active sites can significantly enhance their catalytic ***,we design and synthesize an atomically thin Ni-Se-S based hybrid nanosheet(NiSe1.2S0.8)via a simple solvothermal method,the thickness of NiSe1.2S0.8 nanosheets is only about 1.1 *** from the ultrathin nanostructure and rich defects,the optimal NiSe1.2S0.8 exhibits good electrocatalytic activity with the overpotential of 144 mV at−10 mA·cm−2,a small Tafel slope of 59 mV·dec−1,and outstanding catalytic stability in acid electrolyte for *** theoretical results show that hybrid electrocatalyst by S incorporation possesses the optimal adsorption free energy of hydrogen(ΔGH*).This study provides a simple method to synthesize a highperformance multicomponent electrocatalysts with the ultrathin nanostructures and abundant defects.

关键词： hydrogen evolution reaction atomically thin defect-rich Ni-Se-S electrocatalysts

有载频率与深度学习在桥梁损伤识别中的应用研究

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粉煤灰综合利用 2024年第4期38卷 123-128页

作者：杨超刘凯刘亚红孙建鹏陕西高速公路工程试验检测有限公司陕西西安710086 西安建筑科技大学陕西西安710086

频率作为一种测量方法简单且精度较高的动力特性参数,在损伤识别领域得到广泛应用,但现有的频率变化参数存在非唯一性的问题。为此,提出了基于有载频率指标和深度学习理论的桥梁损伤识别网络,利用损伤前后有载频率数据,构建损伤识别指... 详细信息

频率作为一种测量方法简单且精度较高的动力特性参数,在损伤识别领域得到广泛应用,但现有的频率变化参数存在非唯一性的问题。为此,提出了基于有载频率指标和深度学习理论的桥梁损伤识别网络,利用损伤前后有载频率数据,构建损伤识别指标参数来识别桥梁的损伤状态。结果表明:识别网络能够有效地进行桥梁结构的损伤定位,频率数据克服了对称结构频率变化的非唯一性限制,增强了参数的表达能力,提高了桥梁损伤定位的有效性和抗噪性能。

关键词：桥梁损伤识别有载频率深度学习抗噪性

In vivo imaging of the neuronal response to spinal cord injury:a narrative review

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Neural Regeneration Research 2024年第4期19卷 811-817页

作者： Junhao Deng Chang sun Ying Zheng jianpeng Gao Xiang Cui Yu Wang Licheng Zhang Peifu Tang Department of Orthopedics The Fourth Medical Center of Chinese PLA General Hospital National Clinical Research Center for Orthopedics Sports Medicine and Rehabilitation School of Life Sciences Tsinghua University Department of Orthopedics Air Force Medical CenterPLA Medical School of Chinese PLA Institute of Orthopedics The First Medical CenterChinese PLA General Hospital Key Lab of Regenerative Medicine in Orthopedics Key Laboratory of Musculoskeletal Trauma and War Injuries PLA

Deciphering the neuronal response to injury in the spinal cord is essential for exploring treatment strategies for spinal cord injury(SCI).However,this subject has been neglected in part because appropriate tools are *** in vivo imaging and labeling methods offer great potential for observing dynamic neural processes in the central nervous system in conditions of health and *** review first discusses in vivo imaging of the mouse spinal cord with a focus on the latest imaging techniques,and then analyzes the dynamic biological response of spinal cord sensory and motor neurons to *** then summarize and compare the techniques behind these studies and clarify the advantages of in vivo imaging compared with traditional neuroscience ***,we identify the challenges and possible solutions for spinal cord neuron imaging.

关键词： anterior horn neurons calcium imaging central nervous system dorsal horn neurons dorsal root ganglion in vivo imaging neuronal response spinal cord injury spinal cord two-photon microscopy

MOF-derived Se doped MnS/Ti_(3)C_(2)T_(x) as cathode and Zn-Ti_(3)C_(2)T_(x) membrane as anode for rocking-chair zinc-ion battery

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Nano Research 2024年第4期17卷 2781-2789页

作者： Kaisheng sun Zemao Xiao Yunfei Shen Heng Lv jianpeng Zhu Jianxiang Pang Yang Zheng Wenwen Kong Long Chen School of Chemistry and Chemical Engineering/State Key Laboratory Incubation Base for Green Processing of Chemical Engineering Shihezi UniversityShihezi 832003China CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Key Laboratory of Electronic Information Materials and DevicesCenter of Materials Science and Optoelectronics EngineeringXinjiang Technical Institute of Physics and Chemistry of CASUrumqi 830011China

Mn-based zinc ion battery has the advantages of low cost and high performance,which makes it the promising energy storage ***,the poor conductivity and the agglomeration in the synthesis process of manganese-based materials restrict the performance of ***,the Se-doped MnS/Ti_(3)C_(2)T_(x)(Se-MnS/Ti_(3)C_(2)T_(x))composite material derived from Mn-based metal-organic framework is *** tests show that Se-doped could generate S defects and enhance the electrochemical activity of *** the same time,the introduction of Ti_(3)C_(2)T_(x) substrate is conducive to exposing more sulfur defects and improving the utilization rate of *** the mechanism study,it is found that Se-MnS/Ti_(3)C_(2)T_(x) is transformed into S/Se co-doped Mn3O_(4) at the first charge,which innovatively elucidated the behavior of S/Se during *** the electrochemical performance test,the specific capacity can reach 74.7 mAh·g^(-1) at 5.0 A·g^(-1).In addition,the Zn-Ti_(3)C_(2)T_(x) membrane electrode is prepared by vacuum filtration as the zinc-poor anode,which is assembled into the rocking chair full battery to avoid dendrite growth and exhibit excellent rate *** addition of Zn2+weakens the electrostatic repulsion between the interlayers of MXene,and the formation of the folded morphology aids the penetration of the *** 1.0 A·g^(-1),the capacity can reach 50.6 mAh·g^(-1).This work is helpful to promote the research and development of the reaction mechanism of manganese based rocking chair batteries.

关键词： rocking-chair zinc-ion battery MnS Zn-Ti_(3)C_(2)T_(x) membrane Se doped Ti_(3)C_(2)T_(x) composite

Analysis of the impact of interest rate liberation on China＇s banking sector

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International Journal of Technology Management 2015年第8期 12-14页

作者： Jingxin Huang Deng Ma jianpeng sun Hubei University of Science and Technology Xiarming 447400 China

Actually China has achieved the liberation of deposit and lending rates to some extent, after the start of the reform, it is expected there may not be a great impact on the banking sector in the short term, but in the long term, the interest rate liberation will undoubtedly increase the cost of capital banks, especially after deposit rates achieve the full realization of market-oriented pricing, which will have long term impact on the banking business.

关键词： interest rate liberation China Banking influence