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大跨度隧道中夹岩柱可靠度与间距研究

贵阳学院学报（自然科学版） 2024年第1期19卷 100-104页

作者：李海兵李新钊严盛中建交通建设集团有限公司湖北武汉430000

为探究大跨度隧道中夹岩柱的可靠度与间距问题,以重庆的大坪隧道作为示例,进行受力特征分析,引入Drucker-Prager准则作为岩石的破坏准则,在隧道及中夹岩柱上设置中间布置点进行数据采集,最后计算出中夹岩柱的可靠性和间距关联。实验结... 详细信息

为探究大跨度隧道中夹岩柱的可靠度与间距问题,以重庆的大坪隧道作为示例,进行受力特征分析,引入Drucker-Prager准则作为岩石的破坏准则,在隧道及中夹岩柱上设置中间布置点进行数据采集,最后计算出中夹岩柱的可靠性和间距关联。实验结果表明,在不加宽带隧道段中,左洞有6个位置点的可靠度低于0.875;在间距变化时,支护开挖可靠度在3 m间距的最大可靠度为0.385,间距达到11 m时增加到0.795。以上结果表明,研究方法能够有效地对大跨度隧道的可靠度进行分析,埋深、间距皆对隧道可靠度有较大影响。

关键词：中夹岩柱可靠度分析 Drucker-Prager准则受力特征分析

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基于活动性检测动态估计噪声的心音降噪算法

计算机工程与设计 2024年第1期45卷 236-243页

作者：许春冬辛鹏丽闵源应冬文周静李海兵江西理工大学信息工程学院江西赣州341000 中国科学院大学电子电气与通信工程学院北京100049

针对基于小波分解和最优改进对数幅度谱估计的心音降噪算法存在噪声残留和心音失真的问题,提出一种基于心音活动性检测(HSAD)动态估计噪声的心音降噪算法。通过设计的HSAD判断当前心音帧是否为基础心音帧(FHS),根据判断结果分别采用改... 详细信息

针对基于小波分解和最优改进对数幅度谱估计的心音降噪算法存在噪声残留和心音失真的问题,提出一种基于心音活动性检测(HSAD)动态估计噪声的心音降噪算法。通过设计的HSAD判断当前心音帧是否为基础心音帧(FHS),根据判断结果分别采用改进最小值控制递归平均(IMCRA)算法和递归平滑算法对噪声功率进行动态估计与更新,采用非因果先验信噪比,实现心音信号的降噪。实验结果表明,提出算法能更好在提升降噪性能的同时,降低FHS的失真。

关键词：心音降噪小波分解心音活动性检测改进的最小值控制递归平均递归平滑噪声功率估计非因果先验信噪比

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用荷载传递法分析PTC管桩的抗拔性状

工程建设与设计 2024年第9期 31-34页

作者：张芳芳李海兵山西大同大学山西大同037003 中建一局集团第五建筑有限公司北京100024

建立了PTC管桩的荷载传递模型,并对相关参数的选取与计算进行了探讨。采用VC++语言编写了用位移协调法计算此桩在上拔荷载作用下的P-S曲线及轴力的程序,计算值与实测值吻合良好,则表明此方法合理可行,在实际工程中可用来推算管桩的极限... 详细信息

建立了PTC管桩的荷载传递模型,并对相关参数的选取与计算进行了探讨。采用VC++语言编写了用位移协调法计算此桩在上拔荷载作用下的P-S曲线及轴力的程序,计算值与实测值吻合良好,则表明此方法合理可行,在实际工程中可用来推算管桩的极限承载力,以达到替代或部分替代现场试验的目的。

关键词： PTC管桩荷载传递法载荷试验抗拔性状

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水下硬岩深孔组合式成孔施工技术分析

工程与建设 2024年第2期38卷 383-386页

作者：李秉海曾鹏罡付承涛吴鹏戴笠中国建筑第五工程局有限公司湖南长沙410004

针对深水区、倾斜岩面、硬质岩层地质条件下采用传统大直径冲击钻成孔工效缓慢、费用高、易斜孔的难题,本文对起元特大桥原始施工方案进行优化,将常规旋挖钻成孔法与冲击钻成孔法相结合,创新提出组合式成孔施工技术。该技术工期短、经... 详细信息

针对深水区、倾斜岩面、硬质岩层地质条件下采用传统大直径冲击钻成孔工效缓慢、费用高、易斜孔的难题,本文对起元特大桥原始施工方案进行优化,将常规旋挖钻成孔法与冲击钻成孔法相结合,创新提出组合式成孔施工技术。该技术工期短、经济效益明显、桩基成孔质量稳定、施工安全、文明环保,具有良好的经济效益、社会效益和环保效益。

关键词：水下深孔硬质岩层组合钻进

Episodic Orogeny Deduced from Coeval Sedimentary Sequences in the Foreland Basin and Its Implication for Uplift Process of Longmen Mountain,China

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Journal of Mountain Science 2013年第1期10卷 29-42页

作者： li Yong SU De-chen ZHOU Rong-jun li hai-bing Alexander L.DENSMORE YAN liang YAN Zhao-kun State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Institute of Geology Chinese Academy of Geological Science Institute of Earthquake Engineering Seismological Bureau of Sichuan Province Institute of Hazard and Risk Research and Department of Geography Durham University

Longmen Mountain located at the boundary between the Sichuan Basin and Tibetan Plateau,representing the steepest gradient of any edges of the *** endmember models of uplift process and mechanism have been proposed,including crustal thickening,crustal flow,and crustal isostatic *** we use coeval sedimentary sequences in the foreland basin to restraint uplift process and mechanism in the Longmen *** more than 10,000 m thick Late TriassicQuaternary strata filled in this foreland basin and can be divided into six megasequences that are distinguished as two distinct *** first type is the wedge-shaped megasequences which are sedimentary response of strong active thrust loading events,characterized by a high rate of subsidence and sediment accumulation,coarsening-upward succession and a dual-sourced sediment *** type includes Late Triassic,Late Jurassic to Early Cretaceous and Late Cretaceous to Paleogene *** second type is the tabular megasequences,characterized by the low rate of subsidence and sediment accumulation,finingupward succession,and a single-sourced sediment supply,which is sedimentary response of isostatic rebound and erosion *** type includes the Early to Middle Jurassic,Middle Cretaceous and Neogene to Quaternary *** on sedimentary,active tectonic,geomorphic evidence,we infer that the direction has been reversed from SSWdirected sinistral strike-slip to NNE-directed dextral strike-slip during 40-3.6 Ma,and since 3.6 Ma,the Longmen Mountain thrust belt belong to times of isostatic rebound and erosional unloading with NNEdirected dextral *** suggests that crustal isostatic rebound is a primary driver for uplift and topography of the present Longmen *** Wenchuan(Ms8.0) earthquake,which ruptured a large thrust fault with NNE-directed dextral strikeslip along the range front,is an active manifestation of this crustal isostatic rebound process with dextral st

关键词： Wedge-shaped megasequence Tabular megasequence Orogenic loading Erosional unloading Uplift process Longmen Mountain Foreland basin

Vinyltrimethylsilane as a novel electrolyte additive for improving interfacial stability of li-rich cathode working in high voltage

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Chinese Chemical Letters 2024年第2期35卷 534-538页

作者： bing Jiang Hao li Bi Luo Lehao liu lihua Chu Qiaobao Zhang Meicheng li State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of New EnergyNorth China Electric Power UniversityBeijing 102206China State Key Laboratory of Physical Chemistry of Solid Surfaces College of MaterialsXiamen UniversityXiamen 361005China

Boosting the interfacial stability between electrolyte and li-rich cathode material at high operating voltage is vital important to enhance the cycling stability of li-rich cathode materials for high-performance li-ion *** this work,vinyltrimethylsilane as a new type of organic silicon electrolyte additive is studied to address the interfacial instability of li-rich cathode material at high operating *** cells using vinyltrimethylsilane additive shows the high capacity retention of 73.9%after 300 cycles at 1 C,whereas the cells without this kind of additive only have the capacity retention of 58.9%.The improvement of stability is mainly attributed to the additive helping to form a more stable surface film for li-rich cathode material,thus avoiding direct contact between the electrolyte and the cathode material,slowing down the dissolution of metal ions and the decomposition of the electrolyte under high operating *** findings in this work shed some light on the design of stable cycling performance of li-rich cathode toward advanced li-ion batteries.

关键词： Vinyltrimethylsilane Electrolyte additive li-rich cathode Interfacial stability Capacity retention

Impaired implicit emotion regulation in patients with panic disorder:An event-related potential study on affect labeling

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World Journal of Psychiatry 2024年第2期14卷 234-244页

作者： hai-Yang Wang li-Zhu li Yi Chang Xiao-Mei Pang bing-Wei Zhang Department of Neurology Jining No.1 People's HospitalShandong First Medical UniversityJining 272000Shandong ProvinceChina Department of Neurology and Psychiatry First Affiliated Hospital of Dalian Medical UniversityDalian 116011Liaoning ProvinceChina Department of Neurology Sixth Peoples'Hospital of ShenyangShenyang 110003Liaoning ProvinceChina

BACKGROUND Panic disorder(PD)involves emotion dysregulation,but its underlying mechanisms remain poorly *** research suggests that implicit emotion regulation may play a central role in PD-related emotion dysregulation and symptom ***,there is a lack of studies exploring the neural mechanisms of implicit emotion regulation in PD using neurophysiological *** To study the neural mechanisms of implicit emotion regulation in PD with eventrelated potentials(ERP).METHODS A total of 25 PD patients and 20 healthy controls(HC)underwent clinical *** study utilized a case-control design with random sampling,selecting participants for the case group from March to December *** performed an affect labeling task,using affect labeling as the experimental condition and gender labeling as the control *** and behavioral data were recorded to compare the late positive potential(LPP)within and between the *** Both PD and HC groups showed longer reaction times and decreased accuracy under the affect *** the HC group,late LPP amplitudes exhibited a dynamic pattern of initial increase followed by ***,a significant group×condition interaction effect was *** effect analysis revealed a reduction in the differences of late LPP amplitudes between the affect labeling and gender labeling conditions in the PD group compared to the HC ***,among PD patients under the affect labeling,the late LPP was negatively correlated with disease severity,symptom frequency,and *** PD patients demonstrate abnormalities in implicit emotion regulation,hampering their ability to mobilize cognitive resources for downregulating negative *** late LPP amplitude in response to affect labeling may serve as a potentially valuable clinical indicator of PD severity.

关键词： Panic disorder Implicit Emotion regulation Affect labeling Late positive potential

Hot versus cold subduction initiation

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National Science Review 2024年第2期11卷 101-102页

作者： Zhong-hai li Key Laboratory of Computational Geodynamics College of Earth and Planetary SciencesUniversity of Chinese Academy of Sciences

In the framework of plate tectonics, subduction initiation(SI) indicates the birth of a plate convergent boundary, which is a key point of plate tectonics and Wilson's cycle; however, its dynamic process is not well c... 详细信息

关键词： DRIVEN CRUST

Experimental Study on Vortex-Induced Vibration of Rough Risers with Coupling Interference Effect Under Side-by-Side Arrangement

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China Ocean Engineering 2024年第1期38卷 18-28页

作者： HU Ze-bo liU Zhen li Peng GUO hai-yan WANG Shu-bing REN Xiao-hui HOU Hao WANG Ye-shuo College of Civil Engineering and Architecture Shandong University of Science and TechnologyQingdao 266590China Qingdao Key Laboratory of Marine Civil Engineering Materials and Structures Qingdao 266590China College of Engineering Ocean University of ChinaQingdao 266100China CHEC Dredging Co. LtdShanghai 200136China

A vortex-induced vibration(VIV)experiment of rough risers with coupling interference effect under a side-by-side arrangement was carried out in a wave-current combined *** roughness of the riser was characterized by arranging different specifications of surface attachments on the surface of the *** risers with three different roughnesses were arranged side by side with smooth risers to explore the VIV response of the riser under the combined action of roughness and interference effect,and to reveal the coupling mechanism between roughness and interference *** experimental results show that,compared with that of a smooth riser,the VIV of a rough riser under the coupling interference effect has a wider"lock-in"region,and the displacement decreases more significantly at a high reduced velocity,which is more likely to excite higher-order modes and frequency *** addition,the displacement response and frequency response of the smooth riser are not significantly affected by wake interference from the rough riser,which is caused by the decrease of the wake region due to the delay of the boundary layer separation point of the rough riser.

关键词： marine riser vortex-induced vibration side-by-side arrangement roughness interference effect