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Numerical and theoretical analysis on soil arching effect of prefabricated piles as deep foundation pit supports

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Underground Space 2024年第3期16卷 314-330页

作者： Qianwei Xu Jinli Xie Linhai Lu Yongji Wang Chaojun Wu qiang meng Key Laboratory of Road and Traffic Engineering Ministry of EducationTongji UniversityShanghai 201804China Jinan Rail Transit Group Co. LtdJinan 250101China Guangxi Nanning Airport Comprehensive Transportation Hub Construction Co. Ltd.Nanning 530048China

This study presents a detailed investigation into the soil arching effects within deep foundation pits(DFPs),focusing on their mechanical behavior and implications for structural *** rigorous 3D finite element modeling and parameter sensitivity analyses,the research explores the formation,geometric characteristics,and spatial distribution of soil arching *** investigation encompasses the influence of key parameters such as elastic modulus,cohesion,and internal friction angle on the soil arching *** findings reveal that soil arching within DFPs exhibits distinct spatial characteristics,with the prominent arch axis shifting as excavation depth *** soil arching is observed when the pile spacing approximates three times the pile diameter,enhancing soil retention and minimizing deformation *** analyses highlight the significant impact of soil parameters on soil arching behavior,underscoring the critical role of cohesive forces and internal friction angles in shaping arching *** elucidating the interplay between soil parameters and soil arching effects,the research provides insights for optimizing pile spacing and structural stability.

关键词： Soil arching effect Numerical analysis Foundation pit support Pile spacing

Identifying Three New AGNs among Fermi Unidentified Gigaelectronvolt Sources

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Research in Astronomy and Astrophysics 2024年第7期24卷 257-267页

作者： Shun-Hao Ji Zhong-Xiang Wang qiang-meng Huang Ruo-Heng Yang Department of Astronomy School of Physics and AstronomyYunnan UniversityKunming 650091China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China

We report our identification of three gigaelectronvoltγ-ray sources,4FGL J0502.6+0036,4FGL J1055.9+6507,and 4FGL J1708.2+5519,as Active Galactic Nuclei(AGNs).They are listed in the latest Fermi-Large Area Telescope source catalog as unidentified *** find that the sources all showedγ-ray flux variations in recent *** different survey catalogs,we are able to find a radio source within the error circle of each source's *** analysis of optical sources in the fields allows us to determine the optical counterparts,which showed similar variation patterns to those seen inγ-*** optical counterparts have reported redshifts of 0.6,1.5,and 2.3,respectively,estimated from photometric *** addition,we also obtain an X-ray spectrum of 4FGL J0502.6+0036 and a flux upper limit on the X-ray emission of 4FGL J1055.9+6507 by analyzing the archival *** broadband spectral energy distributions of the three sources from radio toγ-rays are *** mainly theγ-ray properties of the three sources with those of different sub-classes of AGNs,we tentatively identify them as *** optical spectroscopy is highly warranted for obtaining their spectral features and thus verifying the identification.

关键词： gamma-rays galaxies-(galaxies)BL Lacertae objects general-(galaxies)quasars general

In situ regulating intimately connected heterostructure by decomposition of solid solution oxides toward high-efficient water oxidation

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Rare Metals 2024年第4期43卷 1557-1569页

作者： Shao-Fei Zhang Xiao-Lu Yin Jin Wang Jian-Li Kang Tian-Tian Li Jin-Feng Sun Yong-qiang meng Jian-Jiang Wang Dian-Long Wang Kai-qiang Qin Hebei Key Laboratory of Flexible Functional Materials/Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang050018China Key Laboratory of Advanced Ceramics and Machining Technology/Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin300072China Electrochemical Engine Center Department of Mechanical EngineeringPennsylvania State UniversityUniversity ParkPA16802USA

Heterogeneous interfaces produced by interdomain interactions on a nanoscale performs a crucial role in boosting the properties of an electrocatalyst toward oxygen evolution reaction(OER)***,a series of dual-phase electrodes with intimately connected heterointerfaces are prepared by in situ decomposing solid solution oxide of Ni_(x)Co_(y)Fe_(100-x-y)O,which grew on Ni foam massively via an ultrafast combustion ***,with high-reaction kinetics caused by the reduction treatment at 450℃,the less electronegative Fe and Co are more oxyphilic than Ni,which facilitated their co-exsolution and formation of CoFe_2O_4/NiO oxide with enriched oxygen *** from the nanoporous framework,heterojunction structure,and oxygen defects,the self-supporting electrodes present rapid charge/mass transmission and provide abundant active sites for *** optimized sample(R-SNCF4.5)shows low overpotentials of 226 and 324 mV at 10 and100 mA·cm^(-2),a small Tafel slope(46.7 mV·dec^(-1)),and excellent *** assembled R-SNCF4.5//Pt/C/NF electrolyzer demonstrates continuous electrolysis over 50 h at a current density of 10 mA·cm^(-2),under 1.51 *** functional theory(DFT)calculations verify that the strong electronic modulation plays a critical part in the CoFe_2O_4/NiO hybrid by lowering the energy barriers for the ratedetermining steps,and Fe sites are the most active OER sites.

关键词： Rapid combustion Decomposition of solid solution oxide Dual-phase heterostructure Oxygen evolution reaction Theoretical calculation

Microplastic exposure disturbs sleep structure,reduces lifespan,and decreases ovary size in Drosophila melanogaster

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Zoological Research 2024年第4期45卷 805-820页

作者： Wei Yan Zi-Jie Li Zi-Yi Lin Shu-Qin Ji William Ka Fai Tse Zhi-qiang meng Chang Liu Lei Li Shenzhen-Hong Kong Institute of Brain Science Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenGuangdong 518000China CAS Key Laboratory of Brain Connectome and Manipulation the Brain Cognition and Brain Disease InstituteShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenGuangdong 518000China Laboratory of Developmental Disorders and Toxicology Center for Promotion of International Education and ResearchFaculty of AgricultureKyushu UniversityFukuokaFukuoka 819-0395Japan Shenzhen Key Laboratory of Drug Addiction the Brain Cognition and Brain Disease InstituteShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenGuangdong 518000China Guangdong Provincial Key Laboratory of Brain Connectome and Behavior Brain Cognition and Brain Disease InstituteShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenGuangdong 518000China

The organ-specific toxicity resulting from microplastic(MP)exposure has been extensively explored,particularly concerning the gut,liver,testis,and ***,under natural conditions,these effects are not restricted to specific organs or *** whether MP exposure presents a systemic threat to an entire organism,impacting factors such as lifespan,sleep,and fecundity,is *** this study,we investigated the effects of dietary exposure to two different doses of MPs(1–5μm)using the terrestrial model organism Drosophila *** indicated that the particles caused gut damage and remained within the digestive *** MP exposure significantly shortened the lifespan of adult *** short-term exposure disrupted sleep patterns,increasing the length of daytime sleep ***,one week of MP exposure reduced ovary size,with a trend towards decreased egg-laying in mated *** MPs did not penetrate the brain or ovaries,transcriptome analysis revealed altered gene expression in these *** the ovary,Gene Ontology(GO)analysis indicated genotoxic effects impacting inflammation,circadian regulation,and metabolic processes,with significant impacts on extracellular structure-related *** the brain,GO analysis identified changes in pathways associated with proteolysis and carbohydrate ***,this study provides compelling evidence of the systemic negative effects of MP exposure,highlighting the urgent need to address and mitigate environmental MP pollution.

关键词： Microplastics Sleep Lifespan Reproduction Risk assessment Drosophila melanogaster

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从无限宇宙重返封闭世界

自然辩证法研究 2024年第9期40卷 27-33页

作者：孟强中国社会科学院哲学研究所北京100732

生态危机与气候变化是当今世界面临的最为急迫的问题之一,拉图尔后期作了独创性思考。生态危机根本上是现代性危机,要克服该危机,必须对近代科学革命塑造的世界图景进行重构。首先,“人类世”对习以为常的人与自然的二元存在论提出了挑... 详细信息

生态危机与气候变化是当今世界面临的最为急迫的问题之一,拉图尔后期作了独创性思考。生态危机根本上是现代性危机,要克服该危机,必须对近代科学革命塑造的世界图景进行重构。首先,“人类世”对习以为常的人与自然的二元存在论提出了挑战;其次,近代世界图景的确立以伽利略为代表,其实质是“从封闭世界走向无限宇宙”;第三,为应对生态挑战,应当承认地球的特殊性,“从无限宇宙重返封闭世界”;第四,这绝不是要回到“前现代世界”,而是肯定人的存在是有位置的,这个位置就是“大地”;最后,扎根于大地的存在者是“土人”,在世界之中存在是在作为“关键带”的大地之上存在。

关键词：生态哲学拉图尔人类世大地土人

合同格式条款效力的法律控制——以《民法典》合同编及其司法解释为中心

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广东社会科学 2024年第1期 243-260页

作者：孟强北京理工大学法学院北京100081

有关格式条款的法律规定是现代市场交易中不可或缺的一项重要法律制度,《民法典》和《合同编通则解释》都对格式条款进行了专门规定,但是在起草中对一些问题均存在激烈的观点交锋,导致草案前后出现较大变化。在民法典编纂中,合同编草案... 详细信息

有关格式条款的法律规定是现代市场交易中不可或缺的一项重要法律制度,《民法典》和《合同编通则解释》都对格式条款进行了专门规定,但是在起草中对一些问题均存在激烈的观点交锋,导致草案前后出现较大变化。在民法典编纂中,合同编草案将格式条款定义的“3要素”改为“2要素”,舍去“重复使用”,但最终在民法典中又重回“3要素”;《合同编通则解释》则将之修改为“2.5要素”,对从事经营活动的格式条款提供方的“为了重复使用”实行举证责任倒置。《民法典》规定了格式条款绝对无效的情形;《合同编通则解释》细化规定了格式条款的相对无效情形,提出了“异常条款”的概念,并对异常条款提供方提示和说明义务的履行标准做出了细化规定,且对电子合同异常条款提供者提示与说明义务的履行做出了具体的反面规定。为保护条款相对方的利益,《合同编通则解释》还规定了“合同示范文本”和“预先约定排除”这两类排除格式条款效力控制的抗辩为无效抗辩事由。

关键词：格式条款重复使用异常条款提示义务说明义务合同示范文本

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梅洛-庞蒂与延展认知

南京社会科学 2024年第2期 20-26,37页

作者：孟强中国社会科学院大学北京102488 中国社会科学院哲学研究所北京102488

在当代认知科学的发展中,梅洛-庞蒂对涉身认知产生了深刻影响,这是众所周知的。但是,他与延展认知的关系尚未得到重视。从思想史上看,梅洛-庞蒂的现象学几乎没有对延展认知产生影响,不过,从思想逻辑上看,二者具有相同的旨趣。通过考察... 详细信息

在当代认知科学的发展中,梅洛-庞蒂对涉身认知产生了深刻影响,这是众所周知的。但是,他与延展认知的关系尚未得到重视。从思想史上看,梅洛-庞蒂的现象学几乎没有对延展认知产生影响,不过,从思想逻辑上看,二者具有相同的旨趣。通过考察作为在世存在载体的身体及其延展性,这一点得到了有力论证。它们均拒绝内在主义,主张知觉和认知是人与外部技术工具的协同成就。在日新月异的技术社会,这一思路有助于我们理解当代技术对认知的重要价值。

关键词：梅洛-庞蒂延展认知现象学认知科学技术

基于SVM与近红外TDLAS技术的多组分痕量气体识别与检测

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光谱学与光谱分析 2024年第10期44卷 2909-2915页

作者：房孝猛王华来徐晖黄孟强刘向南京信息工程大学电子与信息工程学院江苏南京210044

基于可调谐半导体激光吸收光谱技术(TDLAS),采用频分多路复用(FDM)方法,研究了一种基于支持向量机(SVM)分类的近红外多组分痕量气体识别与检测系统。激光光谱技术表征气体吸收谱线时,气体在近红外波段比远红外吸收能力低,单一波段激光... 详细信息

基于可调谐半导体激光吸收光谱技术(TDLAS),采用频分多路复用(FDM)方法,研究了一种基于支持向量机(SVM)分类的近红外多组分痕量气体识别与检测系统。激光光谱技术表征气体吸收谱线时,气体在近红外波段比远红外吸收能力低,单一波段激光光谱检测气体存在吸收信号弱,各气体组分相互干扰大。为提升探测精度,精准识别气体组分并同时进行多成分检测,基于可调谐半导体激光吸收光谱技术,采用频分复用的近红外TDLAS技术,搭配SVM分类算法进行混合气体的实时检测,有效避免了各气体的交叉干扰,实现了一氧化氮NO、硫化氢H_(2)S、氨气NH_(3)、二氧化氮NO_(2)、乙炔C_(2)H_(2)、二氧化碳CO_(2)、甲烷CH_(4)、氯化氢HCl八种气体标志物的痕量检测。当8个激光器同时工作时,系统控制带通滤波器进行分时滤波,并将差分锁相后的二次谐波数据依次传输至上位机实时显示。识别率超过96.3%,含量平均预测准确率均高于99.6%,取得了CH_(4)最低检测下限为0.01μL·L^(-1)的高精度检测效果,NO_(2)为0.05μL·L^(-1)、C_(2)H_(2)为0.03μL·L^(-1),其余气体检测下限均小于5μL·L^(-1)。对系统多通道检测进行抗干扰和检测下限分析,验证系统稳定工作时实现混合气体的高精度浓度检测。采用分布反馈激光器驱动和锁相放大器与数据处理的SVM算法模型结合,实现近红外TDLAS技术的多组分痕量气体识别与检测,可满足微量气体痕量级检测,对将来进行超低浓度混合气体探测有着非常重要的意义。

关键词：可调谐半导体激光吸收光谱频分多路复用支持向量机混合气体探测

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高职院校课表编排改革探究

鹿城学刊 2024年第1期36卷 121-122,128页

作者：孟强包头职业技术学院教务处内蒙古包头014035

高职院校人才培养方案课程体系设置及教学管理理念与本科院校相比有很大的不同,在课表编排过程中高职院校涉及的因素及存在的困难更多一些。本文阐述了高职院校课程体系的特点,课表编排流程及存在的常见问题,并给出了解决对策。强调了... 详细信息

高职院校人才培养方案课程体系设置及教学管理理念与本科院校相比有很大的不同,在课表编排过程中高职院校涉及的因素及存在的困难更多一些。本文阐述了高职院校课程体系的特点,课表编排流程及存在的常见问题,并给出了解决对策。强调了教务系统在课表编排过程中的重要性,给出了教务系统排课模块应具备的基本功能。本文阐述内容与结论对高职院校课表编排具有一定的借鉴及指导意义。

关键词：课表实践课流程对策