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Attention-based LSTM predictive model for the attitude and position of shield machine in tunneling

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Underground Space 2023年第6期13卷 335-350页

作者： qing Kang Elton J.Chen Zhong-Chao Li han-Bin Luo Yong liu State Key Laboratory of Water Resources Engineering and Management Wuhan UniversityWuhan 430072China School of Civil&Hydraulic Engineering Huazhong University of Science&TechnologyWuhan 430074China Tunnel Engineering Company Wuhan Municipal Construction Group Co.LtdWuhan 430023China

Shield machine may deviate from its design axis during excavation due to the uncertainty of geological environment and the complexity of *** study therefore introduced a framework to predict the attitude and position of shield machine by combining long short-term memory(LSTM)model with attention *** data obtained from the Wuhan Rail Transit Line 6 project were utilized to verify the feasibility of the proposed *** adding the attention mechanism into the LSTM model,the proposed model can focus more on parameters with higher *** analysis based on Pearson correlation coefficient was conducted to improve the prediction efficiency and reduce the irrelevant input *** with LSTM model,LSTM-attention model has higher *** mean value of coefficient of determination(R^(2))increases from 0.625 to 0.736,and the mean value of root mean square error(RMSE)decreases from 3.31 to *** proposed LSTM-attention model can provide an effective prediction for attitude and position of shield machine in practical tunneling engineering.

关键词： LSTM Shield machine Attitude and position prediction Attention mechanism Tunnel excavation

Studies on the Quantitative Structure-activity Relationship of Substituted Biphenyls by Density Function Theory (DFT)

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Chinese Journal of Structural Chemistry 2007年第2期26卷 229-233页

作者： han Xiang-Yun ZHENG qing Department of Chemical Engineering YanchengInstitute of Technology Jiangsu 224003 China

Geometrical configurations of 16 substituted biphenyls were computed at the B3LYP/6-311G^＊＊ level with Gaussian 98 program. Based on linear solvation energy theory, lgKow as well as the structural and thermodynamic parameters obtained at this level was taken as theoretical descriptors, and corresponding equation predicting the toxicity of Daphnia magna （-lgEC5o） was thus obtained, in which three parameters were contained, i.e., n-octanol/water partition coefficients （lgKow）, dipole moment of the molecules（ μ） and entropy （S°）. For this equation, R^2 = 0.9582, q^2 = 0.8921 and SD = 0.102. The absolute t-scores of three variables are larger than the standard one in the confidence range of 95%, which confirms the creditability and stability of this model.

关键词： substituted biphenyl linear solvation energy theory,DFT method Daphnia magna toxicity

Resilient and Safe Platooning Control of Connected Automated Vehicles Against Intermittent Denial-of-Service Attacks

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IEEE/CAA Journal of Automatica Sinica 2023年第5期10卷 1234-1251页

作者： Xiaohua Ge qing-Long han qing Wu Xian-Ming Zhang the School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyMelbourne VIC 3122Australia the School of Engineering and Technology Central Queensland UniversityRockhampton QLD 4701Australia

Connected automated vehicles(CAVs)serve as a promising enabler for future intelligent transportation systems because of their capabilities in improving traffic efficiency and driving safety,and reducing fuel consumption and vehicle emissions.A fundamental issue in CAVs is platooning control that empowers a convoy of CAVs to be cooperatively maneuvered with desired longitudinal spacings and identical velocities on *** paper addresses the issue of resilient and safe platooning control of CAVs subject to intermittent denial-of-service(DoS)attacks that disrupt vehicle-to-vehicle ***,a heterogeneous and uncertain vehicle longitudinal dynamic model is presented to accommodate a variety of uncertainties,including diverse vehicle masses and engine inertial delays,unknown and nonlinear resistance forces,and a dynamic platoon ***,a resilient and safe distributed longitudinal platooning control law is constructed with an aim to preserve simultaneous individual vehicle stability,attack resilience,platoon safety and ***,a numerically efficient offline design algorithm for determining the desired platoon control law is developed,under which the platoon resilience against DoS attacks can be maximized but the anticipated stability,safety and scalability requirements remain ***,extensive numerical experiments are provided to substantiate the efficacy of the proposed platooning method.

关键词： Connected automated vehicles(CAVs) cooperative adaptive cruise control denial-of-service(DoS)attacks resilient control vehicle platooning vehicle-to-vehicle communication

电刺激诱导miR-741-3p调控Radil促进施万细胞的迁移

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中国组织工程研究 2025年第19期29卷 4038-4043页

作者：刘庆高博杨霄姜宇王培承德医学院附属医院河北省承德市067000 承德医学院河北省承德市067000

背景:越来越多的动物实验和临床研究证实电刺激可以促进周围神经损伤修复,具体的机制尚未完全明确。目的:探讨电刺激诱导miR-741-3p调控Radil对施万细胞迁移的影响。方法:①12只雄性SD大鼠,随机分为电刺激组和对照组,电刺激组在坐骨神... 详细信息

背景:越来越多的动物实验和临床研究证实电刺激可以促进周围神经损伤修复,具体的机制尚未完全明确。目的:探讨电刺激诱导miR-741-3p调控Radil对施万细胞迁移的影响。方法:①12只雄性SD大鼠,随机分为电刺激组和对照组,电刺激组在坐骨神经挤压伤后连续电刺激7 d,对照组在坐骨神经挤压后不做任何处理。术后第7天取损伤处神经,利用荧光原位杂交技术检测两组miR-741-3p的表达差异。②通过miRDB、TargetScan和miRWalk数据库预测miR-741-3p靶基因。③将miR-741-3p模拟物及其对照、miR-741-3p抑制物及其对照、Radil siRNA及其对照、miR-741-3p抑制物+Radil siRNA及miR-741-3p抑制物+siRNA对照对施万细胞进行转染,采用RT-PCR检测转染效率,Transwell小室检测施万细胞的迁移能力。结果与结论:①电刺激组神经残端miR-741-3p荧光强度低于对照组;②数据库预测结果显示有69个基因可能是miR-741-3p靶基因,Radil是预测靶基因之一,主要参与细胞黏附和迁移;③与miR-741-3p抑制物对照组相比,miR-741-3p抑制物组施万细胞迁移数增多(P<0.05);与miR-741-3p模拟物对照组相比,miR-741-3p模拟物组施万细胞迁移数减少(P<0.05);与siRNA对照组相比,Radil siRNA组施万细胞迁移数减少(P<0.05);④与miR-741-3p抑制物对照组相比,miR-741-3p抑制物组Radil的表达水平升高;与miR-741-3p模拟物对照组相比,miR-741-3p模拟物组Radil的表达水平降低;⑤与miR-741-3p抑制物+siRNA对照组相比,miR-741-3p抑制物+Radil siRNA组施万细胞迁移数减少(P<0.05)。结果表明,电刺激通过下调miR-741-3p调控Radi的表达来促进施万细胞迁移。

关键词：施万细胞电刺激 miR-741-3p Radil 细胞迁移神经再生

Mechanism of die soldering during aluminum die casting

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China Foundry 2015年第2期12卷 136-143页

作者： qing-you han School of Engineering Technology Purdue University

Soldering is a unique casting defect associated with die casting or metal mold casting of aluminum al oys. It occurs when molten aluminum sticks or solders the surface of the die steel and remains there after the ejection of the casting, causing a surface defect and dimensional inaccuracy of the castings and increased machine downtime. Soldering occurs easily when a bare die steel mold is used for die casting of aluminum al oys. When molten aluminum comes in contact with the die steel at a temperature higher than a critical temperature, the iron and aluminum atoms diffuse into each other, forming a series of intermetallic phases and a liquid aluminum-rich fcc phase. This liquid phase exists between intermetal ic phases. On cooling, the liquid fcc phase solidiifes on the intermetal ic phases and grows into the casting, resulting in soldering. The critical temperature is the eutectic temperature near the aluminum corner of the phase diagram. If the die is protected using a nonreactive ceramic coating, soldering starts at locations where local coating failure occurs. Molten aluminum comes into contact with die steel through the coating failure locations and eats into the steel matrix, forming smal pits. As these smal pits grow, the coating is gradual y removed and soldering becomes more severe. Details of die soldering step on a bare steel die and on a coated die material are discussed.

关键词： soldering die sticking aluminum alloys and die casting

Transition metal-based electrocatalysts for overall water splitting

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Chinese Chemical Letters 2021年第9期32卷 2597-2616页

作者： Xiao-Peng Li Can Huang Wen-Kai han Ting Ouyang Zhao-qing liu School of Chemistry and Chemical Engineering Institute of Clean Energy and MaterialsGuangzhou Key Laboratory for Clean Energy and MaterialsKey Laboratory for Water Quality and Conservation of the Pearl River DeltaMinistry of EducationGuangzhou UniversityGuangzhou Higher Education Mega CenterGuangzhou 510006China

Electrochemical overall water splitting is attracting a broad focus as a promising strategy for converting the electrical output of renewable resources into chemical fuels,specifically oxygen and ***,the urgent challenge in water electrolysis is to search for low-cost,high-efficiency catalysts based on earth-abundant elements as an alternative to the high-cost but effective noble metal-based *** transition metal-based catalysts are more appealing than the noble metal catalysts because of its low cost,high performance and long *** recent advances for the development in overall water splitting are reviewed in terms of transition metal-based oxides,carbides,phosphides,sulfides,and hybrids of their mixtures as hybrid bifunctional *** on different catalytic mechanisms,recent advances in their structural design,controllable synthesis,mechanistic insight,and performance-enhancing strategies are *** challenges and prospects for the future development of transition metal-based bifunctional electrocatalysts are also addressed.©2021 Chinese Chemical Society and Institute of Materia Medica,Chinese Academy of Medical Sciences.

关键词： Transition metal-based Electrocatalysts Hydrogen evolution reaction Oxygen evolution reaction Overall water splitting

Paleoglacial and paleoclimate reconstructions during the global Last Glacial Maximum in the Longriba area, eastern Tibetan Plateau

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Journal of Mountain Science 2021年第2期18卷 307-322页

作者： YANG Wei-lin han Ye-song PENG Xu RAN Ze-ze liu qing liu Geng-nian College of Urban and Environmental Sciences Peking UniversityBeijing 100871China

Owing to the remoteness of the Longriba area and the lack of dating records,it is extremely challenging to reconstruct the chronology and extent of the paleoglaciers in this *** this paper,we combined limited observational data with automated modelling for paleoglacial *** first identified a broadly distributed paleoglacier from satellite imagery and field investigation based on the sediment-landform assemblage principle and dated it to 23.1±1.4~19.5±1.2 ka by ^(10)Be exposure dating,corresponding to the global Last Glacial Maximum(gLGM).Then,we reconstructed the extent and ice surface of 171 paleoglaciers formed during the similar period based on geomorphological evidence and‘ice surface profile’*** results showed that the paleoglacial coverage was 426.5 km2,with an ice volume of 38.1 km^(3),in the Longriba *** reconstructed equilibrium line altitudes(ELAs)based on modelled ice surfaces yielded an average of 4245±66 m above sea level(asl),~725±73 m lower than the present ELA(4970±29 m asl).The temperature was~5.51-6.68℃lower,and the precipitation was~30-34%less in Longriba,during the gLGM compared to the present *** glacial advance was mainly driven by colder climate that was synchronous with Northern Hemisphere cooling events.

关键词： Ice surface profile ^(10)Be surface exposure dating Paleoglacial reconstruction Paleoclimate reconstruction Global Last Glacial Maximum Eastern Tibetan Plateau

Multiplicative Functions Resembling the Mobius Function

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Acta Mathematica Sinica,English Series 2023年第12期39卷 2316-2328页

作者： qing Yang liu School of Mathematics Renmin University of ChinaBeijing 100872P.R.China Institute of Mathematics AMSSThe Chinese Academy of SciencesBeijing 100080P.R.China

A multiplicative function f is said to be resembling the Mobius function if f is supported on the square-free integers,and f(p)=±1 for each prime *** prove O-and Ω-results for the summatory function ∑_(n)≤x f(n)for a class of these f,and the point is that these O-results demonstrate cancellations better than the square-root *** is proved in particular that the summatory function is O(x^(1/3+ε))under the Riemann *** the other hand it is proved to be Ω(x^(1/4))*** is interesting to compare these with the corresponding results for the Mobius function.

关键词： Mobius function random multiplicative function zeta-function

Second phase effect on corrosion of nanostructured Mg-Zn-Ca dual-phase metallic glasses

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Journal of Magnesium and Alloys 2021年第5期9卷 1561-1570页

作者： Chang liu qing Wang Bin han Junhua Luan Ji-Jung Kai Chain-Tsuan liu Ge Wu Jian Lu Department of Mechanical Engineering City University of Hong KongHong KongChina Max-Planck-Institut für Eisenforschung Max-Planck-Straße 1Düsseldorf40237Germany Laboratory for Microstructures Institute of Materials ScienceShanghai UniversityShanghai 200072China Hong Kong Branch of National Precious Metals Material Engineering Research Centre Department of Material Science and EngineeringCity University of Hong KongHong KongChina Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China CityU-Shenzhen Futian Research Institute Shenzhen 518045China

Dual-phase metallic glasses(DP-MGs),a special member of the MGs family,often reveal unusual strength and ductility,yet,their corrosion behaviors are not ***,we developed a nanostructured Mg_(57)Zn_(36)Ca_(7)(at.%)DP-MG and uncovered its corrosion mechanism in simulated body fluid(SBF)at the near-atomic scale utilizing transmission electron microscope(TEM)and atom probe tomography(APT).The 10-nm-wide Ca-rich amorphous phases allow oxygen propagation into the DP-MG,resulting in a micrometer thick hydroxides/oxides *** dense corrosion layer protects the DP-MG from further corrosion,enabling a corrosion rate that is 77%lower than that of Mg(99.99%purity).

关键词： Magnesium alloys Metallic glass Corrosion Sputtered films TEM APT