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Failure analysis and control technology of intersections of large‑scale variable cross‑section roadways in deep soft rock

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International Journal of Coal Science & Technology 2022年第2期9卷 124-146页

作者： Shengrong Xie Yiyi Wu Dongdong Chen Ruipeng Liu xintao han Qiucheng Ye School of Energy and Mining Engineering China University of Mining and TechnologyBeijingBeijing 100083China Mine Safety Technology Branch of China Coal Research Institute Beijing 100013China

In deep underground mining,achieving stable support for roadways along with long service life is critical and the complex geological environment at such depths frequently presents a major *** to the coupling action of multiple factors such as deep high stress,adjacent faults,cross-layer design,weak lithology,broken surrounding rock,variable cross-sections,wide sections up to 9.9 m,and clusters of nearby chambers,there was severe deformation and breakdown in the No.10 intersection of the roadway of large-scale variable cross-section at the−760 m level in a coal *** there are insufcient examples in engineering methods pertaining to the geological environment described above,the numerical calculation model was oversimplifed and support theory underdeveloped;therefore,it is imperative to develop an efective support system for the stability and sustenance of deep *** this study,a quantitative analysis of the geological environment of the roadway through feld observations,borehole-scoping,and ground stress testing is carried out to establish the FLAC 3D variable cross-section crossing roadway *** model is combined with the strain softening constitutive(surrounding rock)and Mohr–Coulomb constitutive(other deep rock formations)models to construct a compression arch mechanical model for deep soft rock,based on the quadratic parabolic Mohr *** integrated control technology of bolting and grouting that is mainly composed of a high-strength hollow grouting cable bolt equipped with modifed cement grouting materials and a high-elongation cable bolt is developed by analyzing the strengthening properties of the surrounding rock before and after bolting,based on the Heok-Brown *** a result of on-site practice,the following conclusions are drawn:(1)The plastic zone of the roof of the cross roadway is approximately 6 m deep in this environment,the tectonic stress is nearly 30 MPa,and the surrounding rock is severely fractured.(2)The def

关键词： Deep soft rock Variable cross-section Roadway intersection Bolting-grouting integration New grouting material

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基于尺度递归分析的恶性室性心律失常检测

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生物医学工程研究 2024年第4期43卷 324-330页

作者：韩欣涛蔡志鹏李建清刘澄玉东南大学仪器科学与工程学院南京210096

为及时准确地检测恶性室性心律失常,本研究提出了一种结合心电多尺度分析与递归量化分析(recurrence quantification analysis, RQA)的方法。首先,通过固定频率经验小波变换滤波器组将心电信号(electrocardiogram, ECG)分解为两个子信号... 详细信息

为及时准确地检测恶性室性心律失常,本研究提出了一种结合心电多尺度分析与递归量化分析(recurrence quantification analysis, RQA)的方法。首先,通过固定频率经验小波变换滤波器组将心电信号(electrocardiogram, ECG)分解为两个子信号(0.5~10 Hz、10~30 Hz),并分别映射为递归图;然后基于0.5~10 Hz频段子信号与原信号构建交叉递归图,从三张递归图中提取RQA特征;最后将特征输入XGBoost分类器进行特征排序与筛选,实现ECG的准确分类。本研究使用MIT-BIT恶性室性心律失常数据库和Creighton大学室性快速性心律失常数据库进行实验。在10折交叉验证下,该方法对5 s心电的恶性室性心律失常检测的灵敏度、特异性、准确率分别为97.40%、99.01%和98.69%。本研究方法在检测恶性室性心律失常方面具有一定的可靠性。

关键词：心电图恶性室性心律失常递归图递归量化分析多尺度

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断层对煤层瓦斯封闭性定量方法研究

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煤炭科学技术 2023年第2期51卷 193-203页

作者：刘永茜韩鑫涛煤炭科学研究总院北京100013 煤炭科学技术研究院有限公司北京100013

断层对煤层瓦斯具有封闭和通道的双重作用,这主要取决于断层的封闭能力。针对断层对瓦斯封闭能力定量化表征方法,结合断裂带结构发育多元学说,分析了断裂带结构参数(两盘煤层对接系数、泥质含量、紧闭系数等)对断层封闭性的影响规律;考... 详细信息

断层对煤层瓦斯具有封闭和通道的双重作用,这主要取决于断层的封闭能力。针对断层对瓦斯封闭能力定量化表征方法,结合断裂带结构发育多元学说,分析了断裂带结构参数(两盘煤层对接系数、泥质含量、紧闭系数等)对断层封闭性的影响规律;考虑了诱导裂隙带宽度与渗透率的相关性,提出了一个断裂带泥岩等效厚度的计算公式和一种渗透率补偿算法,以此为基础,依据低速渗流理论,实现了断层极限封闭压力计算,继而对断层封闭性进行量化表征。研究结果表明:(1)断层封闭性主要受控于断裂带内部结构与断层端面受力状态,考虑顶底板围岩封闭能力和煤储层压力,利用断裂带结构参数和断层封闭压力可对断层封闭性进行综合定量表征;(2)诱导裂隙带煤层渗透率与距端面距离负相关,离端面越远,综合渗透率越低,最后趋近于原始煤层渗透率;(3)等效泥岩厚度越大,断层极限封闭压力越高,断层封闭性越好;(4)沁水盆地郑庄-樊庄区块的寺头断层封闭性计算结果显示,该断层封闭压力高于4.67 MPa,大于储层压力3.83 MPa。然而,该断层走向上的封闭能力存在差异,北东向断层端面封闭性好,西南向断层端面封闭能力则相对较差。研究成果对于科学判识断层的瓦斯封闭能力,指导井下煤与瓦斯突出预测及地面煤层气高效开发具有重要技术支撑作用。

关键词：煤层瓦斯断层封闭性等效泥岩厚度渗透率补偿断层封闭压力

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我国房地产价格波动与中央银行货币政策调控——来自货币供应量、汇率和利率的证据

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南方金融 2011年第11期 4-10,55页

作者：韩鑫韬王擎中国人民银行重庆营业管理部重庆401147 西南财经大学中国金融研究中心四川成都610074

本文通过VAR-MVGARCH模型研究了我国房地产价格增长率分别与货币供应量、汇率和利率的线性和波动关系。研究结果表明,汇率的变化对房地产价格增长率的变动会产生显著的线性影响,但是货币供应量和利率的变化对房地产价格增长率变动的线... 详细信息

本文通过VAR-MVGARCH模型研究了我国房地产价格增长率分别与货币供应量、汇率和利率的线性和波动关系。研究结果表明,汇率的变化对房地产价格增长率的变动会产生显著的线性影响,但是货币供应量和利率的变化对房地产价格增长率变动的线性影响不大。本文认为,尽管货币供应量、汇率和利率对房地产价格增长率存在波动溢出效应,但由于它们与房地产价格增长率的相关性波动剧烈,同时考虑到不断变化的货币政策"盯住"房地产价格波动的困难以及有悖于中央银行保持货币政策"连续性和稳定性"的目标,当前最好实施汇率工具盯住房地产价格增长率的均值化,才容易产生显著效果。

关键词：房地产价格货币政策 VAR—MVGARCH模型

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Physicochemical principles of hydrogen metallurgy in blast furnace

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Journal of Iron and Steel Research International 2024年第1期31卷 46-63页

作者： han-jie Guo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials Beijing100083China

Based on the stoichiometric method and the free energy minimization method,an ideal model for the reduction of iron oxides by carbon and hydrogen under blast furnace conditions was established,and the reduction efficiency and theoretical energy consumption of the all-carbon blast furnace and the hydrogen-rich blast furnace were *** results show that after the reduction reaction is completed at the bottom of the blast furnace,the gas produced by reduction at 1600℃still has a certain excessive reduction capacity,which is due to the hydrogen brought in by the hydrogen-rich blast as well as the excess carbon monoxide generated by the reaction of the coke and the oxygen brought in by the *** the process of the gas with excessive reduction capacity rising from the bottom of the blast furnace and gas reduction process,the excessive reduction capacity of the gas gradually decreases with the increase in the dydrogen content in the *** the all-carbon blast furnace,the excess gas reduction capacity is the strongest,and the total energy consumption per ton of iron reduction is the *** shows that,for the current operation mode of the blast furnace,adding hydrogen in the blast furnace cannot reduce the consumption of carbon required for reduction per ton of iron,but rather increases the consumption of carbon.

关键词： Hydrogen metallurgy Excess gas reduction capacity Theoretical energy consumption Hydrogen-rich blast furnace Thermodynamic model Gibbs minimum free energy method

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Engineered plant extracellular vesicles for autoimmune diseases therapy

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Nano Research 2024年第4期17卷 2857-2873页

作者： Ruina han Yan Wu Yafei han Xiangfei Liu han Liu Jiacan Su Institute of Translational Medicine Shanghai UniversityShanghai 200444China Organoid Research Center Shanghai UniversityShanghai 200444China National Center for Translational Medicine(Shanghai)SHU Branch Shanghai UniversityShanghai 200444China Department of Orthopedics Shanghai Zhongye HospitalShanghai 200941China Department of Orthopedics Xinhua HospitalShanghai Jiao Tong University School of MedicineShanghai 200092China

Autoimmune diseases(AID)encompass a diverse array of conditions characterized by immune system dysregulation,resulting in aberrant responses of B cells and T cells against the body’s own healthy *** extracellular vesicles(PEVs)are nanoscale particles enclosed by phospholipid bilayers,secreted by plant cells,which facilitate intercellular communication by transporting various bioactive *** to their nanoscale structure,safety,abundant sources,low immunogenicity,high yield,biocompatibility,and effective targeting of the colon and liver,PEVs are regarded as a promising platform for the treatment of *** review provides a comprehensive summary of PEV biogenesis,physicochemical and biological properties,internalization mechanisms,isolation methods,and their applications in various diseases,with a specific focus on their potential roles in ***,we propose engineering approaches and administration methods for ***,we present an overview of the advantages and challenges associated with utilizing PEVs for the treatment of *** gaining a comprehensive understanding of PEVs,we anticipate the development of innovative therapeutic strategies for *** and engineered PEVs hold substantial promise as a valuable resource for innovative technologies in AID treatment.

关键词： autoimmune diseases plant extracellular vesicles extracellular vesicles engineering modification

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FAST unveils a new era in the discovery of long-period pulsars in globular clusters

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Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 185-186页

作者： Zhanwen han International Centre of Supernovae Yunnan Key LaboratoryYunnan ObservatoriesChinese Academy of SciencesKunming 650011China

Globular clusters(GC)are among the oldest celestial bodies in the Milky *** possessing millions of stars and have been going through abundant stellar interactions,GCs are futile ground for hunting for compact objects,particularly,neutron stars.A significant number of fast-spinning millisecond pulsars(MSPs)have been discovered,comprising the majority of known GC pulsars.

关键词： stars pulsars abundant

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流式细胞术分选小鼠肺泡巨噬细胞及鉴定

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安徽医科大学学报 2017年第11期52卷 1596-1600页

作者：韩鑫涛赵殿元唐丽安徽医科大学合肥230032 军事医学科学院放射与辐射医学研究所北京100850 蛋白质组学国家重点实验室北京102206

目的建立一种基于流式细胞术分离小鼠肺泡巨噬细胞(AM)的方法。方法小鼠肺脏在体外经胶原酶IV消化后获得单细胞悬液,再经CD11b和CD11c抗体标记,利用流式细胞仪分选获得CD11blowCD11c+AM,并经台盼蓝染色计数细胞活力,以及通过Real-time ... 详细信息

目的建立一种基于流式细胞术分离小鼠肺泡巨噬细胞(AM)的方法。方法小鼠肺脏在体外经胶原酶IV消化后获得单细胞悬液,再经CD11b和CD11c抗体标记,利用流式细胞仪分选获得CD11blowCD11c+AM,并经台盼蓝染色计数细胞活力,以及通过Real-time PCR和吞噬功能进行鉴定。结果流式细胞术分选小鼠肺脏单细胞悬液,获得CD11blowCD11c+细胞,纯度为(93±2)%,细胞活力为(80±5)%;Real-time PCR结果显示过氧化物酶体增殖物激活受体γ(PPARγ)在该群细胞高表达(P<0.001);细胞吞噬功能实验结果显示该群细胞具有较好的吞噬活性,吞噬率约为10%。结论建立了一种基于流式细胞术分选获得AM的方法,该方法获得的细胞纯度高,细胞活性好,可用于功能性实验。

关键词：肺泡巨噬细胞流式细胞术 Real-time PCR 吞噬功能

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On equivalence of state-based potential games

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Science China(Information Sciences) 2024年第6期67卷 313-327页

作者： han WU Jinhuan WANG Institute of Mathematics School of ScienceHebei University of Technology

In this paper, we explore state-based potential games using the semi-tensor product of ***, applying the potential equation, we derive both a necessary and sufficient condition as well as a sufficient condition to verify whether a state-based game qualifies as a potential game. Next, we present two static equivalence conditions of state-based potential games. We then delve into dynamic equivalence. We propose a criterion that allows us to identify state-based games that are dynamically equivalent to state-based potential games and share similar dynamic properties. Ultimately, we introduce the concept of state-based networked evolutionary games. We provide a necessary and sufficient condition to ensure that a state-based networked evolutionary game can be classified as a state-based potential game.

关键词： semi-tensor product of matrices state-based potential game verification equivalence state-based networked evolutionary game

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Track-before-detect for bistatic radar based on pseudo-spectrum

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Chinese Journal of Aeronautics 2024年第1期37卷 236-246页

作者： Tao han Gongjian ZHOU School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Marine Environmental Monitoring and Information Processing Ministry of Industry and Information TechnologyHarbin 150001China

Track-Before-Detect(TBD) is an efficient method to detect dim targets for radars. Conventional TBD usually follows an approximate motion model of the target, which may cause an inaccurate integration of the target energy. A TBD technique on basis of pseudo-spectrum in mixed coordinates adopting an accurate motion model for bistatic radar system is developed in this *** predicted position in bistatic polar plane is derived according to a nonlinear function that exactly describes the constant Cartesian velocity motion. Then around the predicted position, a pseudo-spectrum is formulated and its samples are accumulated to the integration frame for energy integration. The evolution of the state and the procedure of accumulation of the target energy are derived elaborately. The superior performance of the proposed method is demonstrated by some simulations.

关键词： Weak target detection Bistatic radar Track-before-detect Pseudo-spectrum Multiframe integration

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