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Lateral compression and energy absorption of foamed concrete-filled polyethylene circular pipe as yielding layer for high geo-stress soft rock tunnels

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International Journal of Mining Science and Technology 2022年第5期32卷 1087-1096页

作者： Chaoxuan Zhang Xianjun Tan hongming tian Weizhong Chen State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

Foamed concrete as energy absorption material for high geo-stress soft rock tunnels has been proven to be feasible due to its high compressibility and lightweight.However,the lengthy curing and defoaming problems caused by the cast-in-place method of large-volume foamed concrete remain unsolved.In this study,we propose a novel energy absorber composed of foamed concrete-filled polyethylene(FC-PE)pipe and analyze its deformation and energy absorption capacity via quasi-static lateral compression experiments.Results show that FC-PE pipes exhibit typical three-stage deformation characteristics,comprising the elastic stage,the plastic plateau,and the densification stage.Furthermore,the plateau stress,energy absorption,and specific energy absorption of the specimens are 0.81–1.91 MPa,164–533 J,and 1.4–3.6 J/g,respectively.As the density of the foamed concrete increases,the plateau stress and energy absorption increase significantly.Conversely,the length of the plastic plateau and energy absorption efficiency decrease.Moreover,based on the vertical slice method,progressive compression of core material,and the 6 plastic hinges deformation mechanism of the pipe wall,a theoretical calculation method for effective energy absorption is established and achieves good agreement with experimental results,which is beneficial to the optimization of the composite structure.

关键词： Soft rock Yielding layer Foamed concrete Polyethylene pipe Lateral compression Energy absorption

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Anisotropic magnetism and band evolution induced by ferromagnetic phase transition in titanium-based kagome ferromagnet SmTi_3Bi_4

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Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 137-145页

作者： Zhe Zheng Long Chen Xuecong Ji Ying Zhou Gexing Qu Mingzhe Hu Yaobo Huang hongming Weng tian Qian Gang Wang Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Physics and Engineering Henan University of Science and TechnologyLuoyang 471023China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Topological Quantum Computation Chinese Academy of SciencesBeijing 100190China

Kagome magnets with diverse topological quantum responses are crucial for next-generation topological engineering.The anisotropic magnetism and band evolution induced by ferromagnetic phase transition(FMPT)is reported in a newly discovered titanium-based kagome ferromagnet Sm Ti3Bi4,which features a distorted Ti kagome lattice and Sm atomic zig-zag chains.Temperature-dependent resistivity,heat capacity,and magnetic susceptibility reveal a ferromagnetic ordering temperature Tc of23.2 K.A large magnetic anisotropy,observed by applying the magnetic field along three crystallographic axes,identifies the b axis as the easy axis.Angle-resolved photoemission spectroscopy with first-principles calculations unveils the characteristic kagome motif,including the Dirac point at the Fermi level and multiple van Hove singularities.Notably,a band splitting and gap closing attributed to FMPT is observed,originating from the exchange coupling between Sm 4 f local moments and itinerant electrons of the kagome Ti atoms,as well as the time-reversal symmetry breaking induced by the long-range ferromagnetic order.Considering the large in-plane magnetization and the evolution of electronic structure under the influence of ferromagnetic ordering,such materials promise to be a new platform for exploring the intricate electronic properties and magnetic phases based on the kagome lattice.

关键词： kagome lattice anisotropic magnetism band splitting ferromagnetic phase transition ARPES

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Cross-sectional network analysis of plasma proteins/metabolites correlated with pathogenesis and therapeutic response in acute promyelocytic leukemia

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Frontiers of Medicine 2024年第2期18卷 327-343页

作者： Niu Qiao Yizhu Lyu Feng Liu Yuliang Zhang Xiaolin Ma Xiaojing Lin Junyu Wang Yinyin Xie Ruihong Zhang Jing Qiao hongming Zhu Li Chen Hai Fang Tong Yin Zhu Chen Qiang tian Saijuan Chen Shanghai Institute of Hematology State Key Laboratory of Medical GenomicsNational Research Center for Translational Medicine at ShanghaiRuijin Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai200025China Department of Hematology Second Hospital of Dalian Medical UniversityDalian116021China

The treatment of PML/RARA+acute promyelocytic leukemia(APL)with all-trans-retinoic acid and arsenic trioxide(ATRA/ATO)has been recognized as a model for translational medicine research.Though an altered microenvironment is a general cancer hallmark,how APL blasts shape their plasma composition is poorly understood.Here,we reported a cross-sectional correlation network to interpret multilayered datasets on clinical parameters,proteomes,and metabolomes of paired plasma samples from patients with APL before or after ATRA/ATO induction therapy.Our study revealed the two prominent features of the APL plasma,suggesting a possible involvement of APL blasts in modulating plasma composition.One was characterized by altered secretory protein and metabolite profiles correlating with heightened proliferation and energy consumption in APL blasts,and the other featured APL plasma-enriched proteins or enzymes catalyzing plasma-altered metabolites that were potential trans-regulatory targets of PML/RARA.Furthermore,results indicated heightened interferon-gamma signaling characterizing a tumor-suppressing function of the immune system at the first hematological complete remission stage,which likely resulted from therapy-induced cell death or senescence and ensuing supraphysiological levels of intracellular proteins.Overall,our work sheds new light on the pathophysiology and treatment of APL and provides an information-rich reference data cohort for the exploratory and translational study of leukemia microenvironment.

关键词： acute promyelocytic leukemia plasma proteomics plasma metabolomics cross-sectional correlation network pathogenesis treatment

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高焓流场球头外形气动热试验研究

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空气动力学学报 2024年第1期42卷 1-12,I0001页

作者：田润雨龚红明常雨刘济春江涛中国空气动力研究与发展中心跨流域空气动力学重点实验室绵阳621000 中国空气动力研究与发展中心超高速空气动力研究所绵阳621000

再入地球大气层时,飞行器的再入速度极高,面临严重的气动加热问题。为了研究高焓流动导致的热化学非平衡现象,在高焓膨胀风洞FD-14X中开展了球头外形的热流测量试验以及CFD仿真模拟。FD-14X为中国空气动力研究与发展中心新建成的高焓膨... 详细信息

再入地球大气层时,飞行器的再入速度极高,面临严重的气动加热问题。为了研究高焓流动导致的热化学非平衡现象,在高焓膨胀风洞FD-14X中开展了球头外形的热流测量试验以及CFD仿真模拟。FD-14X为中国空气动力研究与发展中心新建成的高焓膨胀风洞,速度模拟能力达到第二宇宙速度,总温模拟能力超过10000 K,能够产生总焓70 MJ/kg的试验气体。试验来流总焓16.9~63.5 MJ/kg,球头直径20~50 mm,流场采用自发光拍照,同时CFD仿真采用Park双温非平衡模型计算球头绕流流场。试验与仿真结果表明:来流总焓大于5 MJ/kg时,球头绕流场存在显著的热化学非平衡现象;304钢模型壁面在来流总焓小于20 MJ/kg时表现为非催化壁面特性,在来流总焓大于30 MJ/kg时表现为催化壁面特性;当球头表面镀氧化锆膜、来流总焓49.5 MJ/kg时,球头壁面表现为非催化壁面特性。

关键词：高焓膨胀风洞球头高温效应热化学非平衡壁面催化/非催化特性热流

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A distributed approach for lidar-based relative state estimation of multi-UAV in GPS-denied environments

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Chinese Journal of Aeronautics 2022年第1期35卷 59-69页

作者： hongming SHEN Qun ZONG Hanchen LU Xuewei ZHANG Bailing tian Lei HE School of Electrical and Information Engineering Ticmjin UniversityTianjin 300072China Institute of Field Engineering Army Engineering University of PLANanjing 210007China

In this paper,we present a distributed framework for the lidar-based relative state estimator which achieves highly accurate,real-time trajectory estimation of multiple Unmanned Aerial Vehicles(UAVs)in GPS-denied environments.The system builds atop a factor graph,and only on-board sensors and computing power are utilized.Benefiting from the keyframe strategy,each UAV performs relative state estimation individually and broadcasts very partial information without exchanging raw data.The complete system runs in real-time and is evaluated with three experiments in different environments.Experimental results show that the proposed distributed approach offers comparable performance with a centralized method in terms of accuracy and real-time performance.The flight test demonstrates that the proposed relative state estimation framework is able to be used for aggressive flights over 5 m/s.

关键词： Distributed relative state estimation GPS-denied environments Lidar-based perception Multi-UAV system Pose-graph optimization

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基于层次分析法的高校化工实验室不安全行为研究

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科学技术创新 2024年第3期 26-31页

作者：谢恬王冯云冯祥瑞胡路路张洪铭江苏海洋大学教务处江苏连云港江苏海洋大学环境与化学工程学院江苏连云港连云港实验学校江苏连云港

为预防高校化工实验室安全事故,运用层次分析法对高校化工实验室不安全行为影响因素进行风险评估与分析。评估过程主要从组织,个人和环境三个方面来分析对实验不安全行为的影响。根据客观性、通用性和适用性原则建立高校实验室不安全行... 详细信息

为预防高校化工实验室安全事故,运用层次分析法对高校化工实验室不安全行为影响因素进行风险评估与分析。评估过程主要从组织,个人和环境三个方面来分析对实验不安全行为的影响。根据客观性、通用性和适用性原则建立高校实验室不安全行为影响因素模型。通过计算三个方面的影响因素的下层指标权重值来评估各因素对实验不安全行为的影响。结果表明,实验习惯方面的权重值0.471 3是最高的,是影响实验不安全行为的主要因素,同时安全设施、实验室安全检查、安全知识、安全意识等因素是较为重要的。基于层次分析法的评估结果能够为高校实验室不安全行为的改善提出参考。

关键词：实验室安全不安全行为化工实验室实验安全管理实践教学

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Los caminos del cielo

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今日中国（西文版） 2022年第7期 21-23页

作者： LIU hongming tian JINWEN 不详

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水杨酸和微生物菌剂对连作障碍烟田烤烟促生效果比较

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昆明学院学报 2024年第3期46卷 11-17页

作者：李卓衡李洪明杨松兵郭存田华徐应超陈雅琼云南省烟草公司昆明市公司云南昆明650051

为探索解决烤烟连作障碍的有效方法,选用水杨酸和3种微生物菌剂在连作障碍烟田开展田间区组试验.结果表明:施用水杨酸的株高、茎围、最大腰叶长、最大腰叶宽和最大腰叶面积均最高,施用壮观链霉菌69-1的叶片数最多,茎围、最大腰叶宽和最... 详细信息

为探索解决烤烟连作障碍的有效方法,选用水杨酸和3种微生物菌剂在连作障碍烟田开展田间区组试验.结果表明:施用水杨酸的株高、茎围、最大腰叶长、最大腰叶宽和最大腰叶面积均最高,施用壮观链霉菌69-1的叶片数最多,茎围、最大腰叶宽和最大腰叶面积仅次于水杨酸;施用水杨酸的百叶质量、单位面积产量和单位面积产值均为最高,施用壮观链霉菌69-1的中上等烟比例和均价均为最高;水杨酸与3种微生物菌剂联用,未出现促进生长和提高产质量的叠加效果.水杨酸和壮观链霉菌69-1均能显著促进烟株生长,提高烟叶产质量,建议在具有连作障碍的烟区进一步扩大面积推广应用.

关键词：水杨酸微生物菌剂烤烟连作障碍生长障碍

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Multiple Dirac points including potential spin-orbit Dirac points in nonsymmorphic HfGe0.92Te

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Science China(Physics,Mechanics & Astronomy) 2023年第1期66卷 155-163页

作者： Long Chen Liqin Zhou Ying Zhou Chen Liu Zhongnan Guo Ke Liao Shunye Gao Wenhui Fan Jinfeng Xu Yuxuan Guo Jia'ou Wang tian Qian hongming Weng Gang Wang Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Department of Chemistry School of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China Songshan Lake Materials Laboratory Dongguan 523808China

The search for new materials with Dirac points has been a fascinating subject of condensed matter physics.Here we first report the growth and band structure of HfGe_(0.92)Te single crystals featuring three different types of Dirac points.HfGe_(0.92)Te crystallizes in a nonsymmorphic tetragonal space group P4/nmm(No.129),having a square Ge-atom plane with vacancies of about 8%.Using angle-resolved photoemission spectroscopy(ARPES),the Dirac nodal line composed of conventional Dirac points vulnerable to spin-orbit coupling(SOC)is observed,accompanied by robust Dirac points protected by the nonsymmorphic symmetry against SOC and vacancies.In particular,spin-orbit Dirac points(SDPs)originating from the surface formed under significant SOC could exist based on ARPES and calculations.Quasi-two-dimensional(quasi-2D)characteristics are confirmed by angular-resolved magnetoresistance.HfGe_(0.92)Te bulk crystals can be easily exfoliated to flakes with a thickness of approximately 5 nm for the quasi-2D nature.Thus,HfGe_(0.92)Te provides a good platform to explore exotic topological phases or topological properties with three different types of Dirac points,which is a potential candidate to achieve novel 2D SDPs.

关键词： Dirac points spin-orbit coupling quasi-2D characteristics

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森林群落生物多样性维持机制研究

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中国林副特产 2024年第3期 73-75页

作者：刘延坤张鹤东汪洪明戚福坤何萍田松岩黑龙江省生态研究所森林生态与林业生态工程重点实验室哈尔滨150081 黑龙江牡丹江森林生态系统国家定位观测研究站黑龙江牡丹江157500

森林群落幼苗更新生态学过程及驱动力是影响群落构建、演替以及生物多样性维持机制研究的核心科学问题。各个树种由于生活史策略存在差异,导致生物与非生物因子对其影响也存在不同,生物与非生物影响因子对幼苗存活生态过程的正负反馈机... 详细信息

森林群落幼苗更新生态学过程及驱动力是影响群落构建、演替以及生物多样性维持机制研究的核心科学问题。各个树种由于生活史策略存在差异,导致生物与非生物因子对其影响也存在不同,生物与非生物影响因子对幼苗存活生态过程的正负反馈机制(密度制约、生境过滤)尚有诸多争议和不确定性,二者在幼苗阶段中的相对重要性依然是目前最为复杂的研究主题。对森林群落木本植物幼苗更新过程中的两个重要的生态学假说——负密度制约、生境过滤作用对幼苗存活的影响进行了分析,并探讨了两种作用在幼苗更新过程中的相对重要性,基于幼苗更新动态及其生态学过程的研究现状对未来研究进行了展望。

关键词：幼苗更新负密度制约生境过滤

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