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International Journal of Mental Health Promotion 2024年第6期26卷 429-438页

作者： Yuetan Wang Xianle Yan Lili Liu Xiran Lu Lan Luo xiaobin ding Key Laboratory of Behavioral and Mental Health of Gansu Province Northwest Normal UniversityLanzhou730070China School of Psychology Northwest Normal UniversityLanzhou730070China

Social anxiety (SA) is a prevalent mental health issue among adolescents, and vulnerable narcissism (VN) can exacerbate thiscondition. This study aims to investigate the impact of vulnerable narcissism on social anxiety in adolescents, specificallyfocusing on the mediating effects of self-concept clarity (SCC) and self-esteem (SE) in the relationship between vulnerablenarcissism and social anxiety. Through cluster sampling, a questionnaire survey was conducted among 982 students from threesecondary schools in two provinces. The data was analyzed using structural equation modeling (SEM). The results revealedthat there was a significant negative correlation between vulnerable narcissism and both self-concept clarity and self-esteem,while there was a significant positive correlation between vulnerable narcissism and social anxiety. Additionally, self-conceptclarity showed a significant positive correlation with self-esteem but had a negative correlation with social anxiety. Both selfconceptclarity and self-esteem played an intermediary role in the chain linking vulnerable narcissism to social anxiety. Thisstudy confirms the mediating role of both self-concept clarity and self-esteem in explaining how vulnerable narcissisminfluences social anxiety, providing valuable insights into its underlying mechanism.

关键词： Social anxiety vulnerable narcissism self-concept clarity self-esteem adolescent

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EPB盾构刀盘泥饼成因分析及评价模型构建

华南理工大学学报（自然科学版） 2024年第5期52卷 71-83页

作者：丁小彬杨辉泰施钰华南理工大学土木与交通学院广东广州510640 华南岩土工程研究院广东广州510640

目前土压平衡(EPB)盾构机刀盘结泥饼的研究大都聚焦在单一因素上,缺少整体的、量化的评价标准,难以满足工程上对刀盘结泥饼的预测需求。针对以上问题,文中从地质条件、盾构选型、施工因素3个层面出发,系统总结了导致土压平衡盾构机刀盘... 详细信息

目前土压平衡(EPB)盾构机刀盘结泥饼的研究大都聚焦在单一因素上,缺少整体的、量化的评价标准,难以满足工程上对刀盘结泥饼的预测需求。针对以上问题,文中从地质条件、盾构选型、施工因素3个层面出发,系统总结了导致土压平衡盾构机刀盘泥饼形成的23个主要因素;将土压平衡盾构机在掘进过程中的刀盘结泥饼风险划分为4个等级:高风险、中风险、低风险和无风险。同时提出了结泥饼的风险因子量化标准,并结合层次分析法构建了土压平衡盾构的刀盘结泥饼风险评价模型;基于广州地铁14号线马创区间右线115-165环盾构隧道工程的掘进数据,计算出盾构机掘进过程中不同环的刀盘结泥饼风险程度,验证了刀盘结泥饼风险评价模型的预测性能。研究结果表明:结泥饼风险评价模型的23个影响因子中,以塑性指数、刀盘扭矩、液性指数、总推力的影响权重最大,启动扭矩的影响权重最小;结泥饼风险评价模型表现出了良好的预测性能,计算得到的结泥饼风险变化曲线与现场施工情况基本吻合;盾构掘进参数的变化能很好地反映掘进过程中泥饼的形成,其中总推力对泥饼产生最敏感,刀盘扭矩、土仓压力、推进速度和螺旋机转速的敏感度依次降低。研究成果可适用于类似工程中的土压平衡盾构机刀盘结泥饼的评价分析。

关键词：土压平衡盾构泥饼量化分析评价模型

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基于改进接触模型的类岩石材料裂纹扩展分析

华南理工大学学报（自然科学版） 2024年第8期52卷 146-158页

作者：丁小彬谢宇轩施钰华南理工大学土木与交通学院广东广州510640 韦仕敦大学土木与环境工程学院加拿大安大略伦敦N6A 3K7

为了探究复杂应力状态下岩体内缺陷(裂隙)的扩展与贯通机理,基于三维离散元软件(PFC3D)和改进的平行黏结模型(IPBM),模拟了双轴压缩试验中含双预制裂纹类岩石材料的裂纹扩展过程。通过逼近实验试件抗压强度、抗拉强度和弹性模量的宏观... 详细信息

为了探究复杂应力状态下岩体内缺陷(裂隙)的扩展与贯通机理,基于三维离散元软件(PFC3D)和改进的平行黏结模型(IPBM),模拟了双轴压缩试验中含双预制裂纹类岩石材料的裂纹扩展过程。通过逼近实验试件抗压强度、抗拉强度和弹性模量的宏观力学参数和裂纹扩展模式,调整数值模型微观参数。针对离散元模拟中的关键预制裂隙参数与围压对裂纹萌生、扩展及贯通过程的影响进行详尽的分析,结果表明:初始裂纹通常为拉伸裂纹,而次生裂纹通常为剪切裂纹,裂隙倾角主要影响初始裂纹位置;围压抑制初始裂纹,但促进次生裂纹发展;预制裂隙间的贯通裂纹与裂隙的参数和围压密切相关;围压σc>0 MPa时,观察到两种新的剪切贯通类型(New1和New2);数值试样中微裂纹的数量主要受围压影响,与裂隙参数无明显关联;试样的裂纹起始应力、峰值应力与围压和裂隙倾角相关,与岩桥长度和岩桥倾角无关;裂纹的扩展与试样内应力分布密切相关,裂纹最先在裂隙周围的应力集中区产生。结果为后续岩石与类岩石材料的离散元模型参数校准,以及基于离散元的裂纹扩展机理研究提供了可靠参考。

关键词：类岩石材料裂纹扩展三维离散元数值模拟双轴压缩

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循环荷载下花岗岩动力响应及本构模型

郑州大学学报（工学版） 2024年第1期45卷 90-97页

作者：丁小彬赵君行董耀俊华南理工大学土木与交通学院广东广州510640 华南理工大学华南岩土工程研究院广东广州510640

利用真三轴试验机,对尺寸为100 mm×100 mm×100 mm的花岗岩试样进行了循环荷载下的试验研究,探究非破坏状态下不同围压、动载频率、动应力幅以及循环周次下花岗岩动弹性模量以及动阻尼比的变化规律,并将所得数据进行对比分析。试验结... 详细信息

利用真三轴试验机,对尺寸为100 mm×100 mm×100 mm的花岗岩试样进行了循环荷载下的试验研究,探究非破坏状态下不同围压、动载频率、动应力幅以及循环周次下花岗岩动弹性模量以及动阻尼比的变化规律,并将所得数据进行对比分析。试验结果表明:花岗岩动弹性模量随围压线性增长,动阻尼比随围压线性递减,动弹性模量增幅逐渐变大;花岗岩动弹性模量随动载频率指数增长,动阻尼比随动载频率幂函数增长,在20 Hz的动载频率下岩石内部活动较为剧烈,动载频率对岩石的影响程度较大;动弹性模量随动应力幅二次函数增长,动阻尼比随动应力幅幂函数减小,动阻尼比变化受到岩性影响;改进邓肯-张模型很好地反映了花岗岩在不同作用下岩石动态本构关系。该试验得到的模型可为后续动力特性的反演提供参考。

关键词：三轴试验动弹性模量动阻尼比改进邓肯-张模型

Theoretical investigation of electron-impact ionization of W8+ion

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Chinese Physics B 2024年第3期33卷 341-349页

作者：张世平张芳军张登红丁晓彬蒋军颉录有马玉龙李麦娟 Marek Sikorski 董晨钟 Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070China

The electron-impact single ionization cross section for W8+ion has been calculated using flexible atomic code,employing the level-to-level distorted-wave *** calculations takes into account contributions form both direct ionization(DI)and excitation autoionization(EA).However,the theoretical predictions,based solely on the ground state,tends to underestimate the experimental *** discrepancy can be mitigated by incorporation contributions from excited *** extended the theoretical analysis,including the contributions from the long-lived metastable states with lifetimes exceeding 1.5×10-5 *** employed two statistical models to predict the fraction of ground state ions in the parent ion *** a 79%fraction of parent ions in ground configuration,the experiment measurements align with the *** we derived the theoretical cross-section for the ground state as correlated plasma rate coefficients,and compared it with existing *** the uncertainty in our calculations,our results are still acceptable.

关键词： tungsten ions electron-impact ionization cross section

地连墙重锤成槽施工对临近变电站振动影响分析

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科技通报 2024年第3期40卷 86-91页

作者：丁小彬施钰杨辉泰华南理工大学土木与交通学院广州510641

地下连续墙成槽不可避免的对土层及周边建筑物产生较大影响,尤其需要采用落锤冲击成槽等重型施工工艺时,导致地层及邻近结构产生振动。本文依托于广州地区某紧邻变电站的地连墙成槽工程,利用Midas有限元分析软件,建立落锤冲击成槽的三... 详细信息

地下连续墙成槽不可避免的对土层及周边建筑物产生较大影响,尤其需要采用落锤冲击成槽等重型施工工艺时,导致地层及邻近结构产生振动。本文依托于广州地区某紧邻变电站的地连墙成槽工程,利用Midas有限元分析软件,建立落锤冲击成槽的三维实体有限元模型,研究冲击荷载对临近电站桩基质点振动速度的影响,验证桩锤冲击和方锤修壁2种成槽施工方案的可行性。数值结果表明:电站桩基质点振动速度随落锤冲程的增大而增大,且竖向振动速度峰值最大;在一定冲程范围内,2种成槽施工方案均能满足规范要求。研究结果可为现场施工及类似工程提供参考。

关键词：地下连续墙施工振动落锤冲击荷载数值模拟

Face stability analysis of large shield-driven tunnel in rock-soil interface composite formations

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Underground Space 2022年第6期7卷 1021-1035页

作者： xiaobin ding Kang Li Yuxuan Xie Shuzhuo Liu School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510641China Guangdong Provincial Key Laboratory of Modern Civil Engineering Technology South China Institute of Geotechnical EngineeringGuangzhou 510650China

A new 3D log-spiral model(LS-M model)is proposed to determine the minimal support pressure on the tunnel face of a large shielddriven tunnel in rock-soil interface(RSI)composite *** the proposed LS-M model,we define the RSI angle ω and use a new approach to calculate the equivalent tunnel face area,which provides a collapse zone with more realistic geometry than the traditional wedge *** it has acceptable accuracy with simpler implementation than limit equilibrium *** with previous studies and 3D numerical analysis,it indicates that:(i)the LS-M results agree well with others in full-soil formations on the variation patterns of minimum support pressure and stability coefficients N_(c) and N_(γ);(ii)the critical RSI angle ω_(cr),which is predominantly influenced by soil cohesion,increases with the soil property values;(iii)the limit support pressure starts to increase with ω only when ω>ω_(cr);(iv)the peak support pressure occurs at lower C/D with a lower ω;(v)ω can only affect stability coefficients N_(c) and N_(γ) when ω and the friction angle are relatively small,while N_(s) is substantially influenced by RSI angle ω.

关键词： Tunnel Stability Limit support pressure RSI composite formations 3D failure mechanism

基于复合式连续皮带机的盾构出渣质量计算研究

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中外公路 2024年第4期44卷 203-209页

作者：周标丁小彬孙文坚任续锋中铁十六局集团路桥工程有限公司北京市101500 华南理工大学土木与交通学院广东广州510641

为使盾构施工渣土管理精准化,该文利用盾构施工中连续皮带机的施工数据,对两种常见的盾构渣土质量计算方法(基于松散系数的盾构渣土质量结算法、考虑外加剂的盾构渣土质量结算法)进行评价与分析,并根据盾构每环出渣的变化规律,提出一种... 详细信息

为使盾构施工渣土管理精准化,该文利用盾构施工中连续皮带机的施工数据,对两种常见的盾构渣土质量计算方法(基于松散系数的盾构渣土质量结算法、考虑外加剂的盾构渣土质量结算法)进行评价与分析,并根据盾构每环出渣的变化规律,提出一种改进的盾构渣土质量估算方法。研究结果表明:基于松散系数的盾构渣土质量计算方法误差显著;采用考虑外添加剂的渣土质量计算方法时,计算值总小于实际出渣质量,两者差值趋近于某值,且与所研究的两种主要地层条件和渣土称量方式相关性不大。该文提出的改进的渣土计算方法提高了渣土质量估算准确性,与实际盾构出土质量吻合良好。

关键词：盾构施工连续皮带机监测精准出渣量估算计算方法创新智慧渣土管理

Isotope shift of the 2s^(2)S_(1/2)→ 2p^(2)P_(1/2,3/2) transitions of Li-like Ca ions

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Chinese Physics B 2021年第4期30卷 206-210页

作者： Denghong Zhang Fangjun Zhang xiaobin ding Chenzhong Dong Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070China

The mass-and field-shift parameters of the two 2s^(2)S_(1/2)→ 2p^(2)P_(1/2,3/2) transitions in the Li-like Ca ions are calculated by using multi-configuration Dirac-Hartree-Fock(MCDHF) and the relativistic configuration interaction(RCI) methods with the inclusion of the transverse photon(Breit) interaction,vacuum polarization and self-energy *** addition,the mass shift and field shift of these two transitions are calculated,where the field shift is calculated by using the evaluated value δ(r^(2)) obtained by [Atomic Data and Nuclear Data Tables 99 69(2013)].It is found that the mass shift of Li-like Ca ions is greater than the field shift.

关键词： isotope shift multi-configuration Dirac-Hartree-Fock(MCDHF) mass shift field shift

Effects of the nozzle structure and fluidized gas composition on the gas-particle two-phase jet characteristic in a powder fuel scramjet

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Particuology 2024年第9期92卷 166-179页

作者： Changfei Zhuo Hongming ding xiaobin Ren Hanyu Deng Xiong Chen School of Mechanical and Engineering Key Laboratory of Special Engine TechnologyMinistry of EducationNanjing University of Science and TechnologyNanjing210094China Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore117576 Shanxi North Xing'an Chemical Industry Co. Ltd.Taiyuan030008China

The interaction between nozzle design and fluidization gas composition significantly influences the dynamics within a powder fuel scramjet's combustion *** investigate this relationship,an experimental study utilized high-speed shadow imaging technology to explore the macroscopic aspects of powder fuel *** investigation examined various convergence angles,nozzle throat lengths,and fluidized gas *** findings include:During jet development,powder fuel initially concentrates near the axis,with non-convergence angle nozzles exhibiting longer concentrated distribution periods than convergence angle *** nozzle convergence angles lead to increased penetration distance,frontal velocity,and radial diffusion distance during the initial stages of jet ***,stable jet shapes show larger divergence angles as nozzle convergence angle decreases,with the largest divergence angle observed atα=60°.In the initial 0-7 ms of jet development,the powder fuel jet demonstrates greater penetration distance and frontal velocity under certain ***,penetration distance and frontal velocity increase with throat length from 7 to 20 ms,accompanied by changes in divergence ***,at a throat length(l)of 2 mm,the near-field divergence angle measures 46.50°,and the far-field divergence angle is 22.25°.Conversely,at l=8mm,the near-field divergence angle is 33.49°,and the far-field divergence angle is 23.21°.The fluidization gas composition minimally affects jet penetration distance and frontal velocity during the initial 0-3 ***,due to hydrogen's low density,hydrogen/powder fuel jets exhibit shorter distances and velocities compared to nitrogen/powder fuel *** fluidization also results in larger divergence angles,particularly in the near *** findings underscore the importance of nozzle design and fluidization gas composition in optimizing scramjet performance and efficiency.

关键词： Multiphase flows Gas-particle two-phase jet Nozzle contraction angle Powder fuel scramjet