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Dynamic destabilization analysis based on AE experiment of deep-seated,steep-inclined and extra-thick coal seam

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Journal of University of Science and Technology Beijing 2008年第3期15卷 215-219页

作者： Fenhua ren Xmgpmg lai Meifeng Cai School of Civil and Environment Engineering University of Science and Technology Beijing Beijing 100083 China School of Energy and Resource Xi＇an University of Science and Technology Xi＇an 710054 China

No. 5 coal seam in Huating Coal Mine is a deep-seated, steep-inclined extra-thick coal seam where excavation disturbance is quite frequent. The maximum and minimum principal stresses differ widely. During mining, dynamical destabilization happens frequently and induce tragedies. Based on the comparison between the acoustic emission （AE） experiment on dynamical destabilization of coal rock and the related in situ testing results, this article provides comprehensive analysis on the regular quantificational AE patterns （energy rate, total events） of coal rock destabilization in complex-variable environment. The comparison parameters include dynamic tension energy rate, deformation resistance to compression, and shear stress.

关键词： coal seam acoustic emission (AE) destabilization excavation disturbance

Obituary:*** Zhang(1963-2023)-A scientist focused on toxins and their underlying mechanisms to decipher human diseases

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Zoological Research 2024年第1期45卷 230-232页

作者： Wenhui Lee ren lai the Key Laboratory of Bioactive Peptides of Yunnan Province Engineering Laboratory of Peptides of Chinese Academy of SciencesKIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common DiseasesNational Resource Centre for Non-Human PrimatesKunming Primate Research CentreNational Research Facility for Phenotypic&Genetic Analysis of Model Animals(Primate Facility)Sino-African Joint Research CentreNew Cornerstone Science InstituteKunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650107China

*** Zhang was born on 9 July 1963 in Kunming,Yunnan,China,during a tumultuous period which he often *** his life,he harbored a steadfast belief in using knowledge to unravel the mysteries of human *** educational journey was marked by frequent changes in schools due to his parents’occupational ***,despite these challenges,he consistently displayed diligence and was admitted to the East China University of Science and Technology,Shanghai,after completing high school in *** remained an active and loyal member of the School of Biotechnology at the university.

关键词： admitted harbor mechanisms

Bioorthogonal chemistry based on-demand drug delivery system in cancer therapy

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Frontiers of Chemical Science and Engineering 2023年第4期17卷 483-489页

作者： Lan Lin lai Jiang En ren Gang Liu State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics&Center for Molecular Imaging and Translational Medicine School of Public HealthXiamen UniversityXiamen 361102China

Benefiting from the advantage of taking place in biological environments without interfering with an innate biochemical process,the bioorthogonal reaction that commonly contains the“bond formation”and“bond cleavage”system has been widely used in targeted therapy for a variety of ***,several prominent cases based on the bioorthogonal reaction that tailoring the metabolic glycoengineering tactics to modified cells for cancer immunotherapy,and the innovative tactics for reducing the metal ions’toxic and side effects with microneedle patches will be *** on these applications,the complexities,potential pitfalls,and opportunities of bioorthogonal chemistry in future cancer therapy will be evaluated.

关键词： bioorthogonal reaction cancer therapy metabolic glycoengineering bioorthogonal catalytic patch

An All Fiber 1.94µm Nanosecond Pulse Laser Amplified by Highly Tm^(3+)-Doped Silicon Fibers

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Chinese Physics Letters 2013年第5期30卷 78-81页

作者： ZHOU ren-lai ren Jian-Cun yang Chao JU You-Lun WANG Yue-Zhu National Key Laboratory of Tunable Laser Technology Harbin Institute of TechnologyHarbin 150080 Naval Aeronautical&Astronautical University Yantai 264000

We present an all-fiber 1.94μm nanosecond pulse laser in master oscillation-power amplifier configuration.A dual-FBGs gain-switched Tm^(3+)-doped fiber laser is built and is used as the seed *** output characteristics of the amplifier are studied at different pulse repetition rates,and the maximum output energy of 500μJ is achieved under incident pump power of 39 *** emitting spectra are checked at 5 and 10 kHz,and no obvious nonlinear effects are observed in the spectrum of the amplified *** beam quality factor is M^(2)=2.1±0.03 measured by the traveling knife-edge method,and the laser beam spot is also monitored by an infrared vidicon camera.

关键词： amplifier fiber switched

Small glitches: the role of strange nuggets?

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Research in Astronomy and Astrophysics 2016年第3期16卷 91-98页

作者： Xiao-Yu lai ren-Xin Xu School of Physics Xinjiang University Xinjiang Astronomical Observatory Chinese Academy of Sciences School of Physics Peking University Kavli Institute for Astronomy and Astrophysics Peking University

Pulsar glitches, i.e. the sudden spin-ups of pulsars, have been detected for most known *** mechanism giving rise to this kind of phenomenon is uncertain, although a large data set has been *** the framework of the starquake model, based on Baym ＆ Pines, the glitch sizes（the relative increases of spin-frequencies during glitches） △Ω/Ω depend on the released energies during glitches, with less released energies corresponding to smaller glitch sizes. On the other hand, as one of the dark matter candidates,our Galaxy might be filled with so called strange nuggets（SNs） which are relics from the early *** this case collisions between pulsars and SNs are inevitable, and these collisions would lead to glitches when enough elastic energy has been accumulated during the spin-down process. The SN-triggered glitches could release less energy, because the accumulated elastic energy would be less than that in the scenario of glitches without SNs. Therefore, if a pulsar is hit frequently by SNs, it would tend to have more small glitches, whose values of ？？/？ are smaller than those in the standard starquake model（with larger amounts of released energy）. Based on the assumption that in our Galaxy the distribution of SNs is similar to that of dark matter, as well as on the glitch data in the ATNF Pulsar Catalogue and Jodrell Bank glitch table, we find that in our Galaxy the incidences of small glitches exhibit tendencies consistent with the collision rates between pulsars and SNs. Further testing of this scenario is expected by detecting more small glitches（e.g.,by the Square Kilometre Array）.

关键词： pulsars -- glitches -- quark-cluster stars -- strange nuggets

Supernova neutrinos in a strangeon star model

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Research in Astronomy and Astrophysics 2017年第9期17卷 39-50页

作者： Mao Yuan Ji-Guang Lu Zhi-Liang yang Xiao-Yu lai ren-Xin Xu Department of Astronomy Beijing Normal UniversityBeijing 100875China School of Physics Peking UniversityBeijing 100871China School of Physics and Engineering Hubei University of EducationWuhan 430205China Kavli Institute for Astronomy and Astrophysics at Peking University Beijing 100871China

The neutrino burst detected during supernova SN 1987A is explained in a strangeon star model, in which it is proposed that a pulsar-like compact object is composed of strangeons （strangeon： an abbreviation for ＂strange nucleon＂）. A nascent strangeon star＇s initial internal energy is calculated, with the inclusion of pion excitation （energy around 1053 erg, comparable to the gravitational binding energy of a collapsed core）. A liquid-solid phase transition at temperature - 1 - 2 MeV may occur only a few tens of seconds after core collapse, and the thermal evolution of a strangeon star is then modeled. It is found that the neutrino burst observed from SN 1987A can be reproduced in such a cooling model.

关键词： stars neutron -- supernovae individual (SN 1987A)- neutrinos

Study of the crosstalk evaluation for cavity BPM

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Nuclear Science and Techniques 2018年第6期29卷 67-75页

作者： Jian Chen Yong-Bin Leng Lu-yang Yu Long-Wei lai ren-Xian Yuan Shanghai Institute of Applied Physics Chinese Academy of Science Shanghai 201204 China University of the Chinese Academy of Science Beijing 100049 China

In order to pursue high-precision beam position measurements for free-electron laser facilities, a cavity beam position monitor(CBPM) is employed to measure the transverse position that can meet the requirement of position resolution at a sub-micrometer or even nanometer scale. However, for the pill-box cavity BPM, crosstalk between the cavities will have an effect on the accurate measurement of beam position. To reduce the effect of crosstalk on CBPM performance and ease the measurement of the isolation between the cavities, the cavities with a slight difference in resonant frequency were designed and applied in the Dalian coherent light source and Shanghai soft X-ray free-electron laser facilities. Furthermore, two methods, the principal component analysis method and the method of harmonic analysis, are proposed in this paper to evaluate the crosstalk. The results demonstrate that the two methods are feasible in evaluating the crosstalk between the cavities.

关键词： BPM 串音评估位置分辨率学习精确测量激光设备主要部件

Quantitative analysis of biotechnical reinforcement for a steep slope consisting of composite coal-gangue-soil medium adjacent to a mined-out area

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Journal of University of Science and Technology Beijing 2005年第6期12卷 489-494页

作者： Xingping lai Mowen Xie Fenhua ren Meifeng Cai Civil and Environmental Engineering School University of Science and Technology Beijing Beijing 100083 China Energy School Xi＇an University of Science and Technology Xi＇an 710054 China West Mining and Hazard Control Key Laboratory of the Ministry of Education of China Xi＇an 710054 China

The engineering and geological characteristics of a steep slope consisting of coal gangue, rock and soil medium in Huating coal mine have been comprehensively investigated. Owing to humid weather, heavy rainfall, vegetation and porous characteristics of the soil and rock mass, the steep slope will be destabilized and induce mud-rock flow or derive hazard easily. Firstly, based on the classical slope reinforcement theory, some regularity between the shear and displacement in the destabilized zone of the slope with or without root strength contribution is presented. Then, based on the experimental and statistical analysis of root strength, hydrological characteristics and stability status, etc., some possible biotechnical techniques for reinforcement of the steep slope have been suggested. These methods are important for quantitative analysis of destabilization of the slope and design of the biotechnical reinforcement.

关键词： mined-out area coal-gangue-soil composite medium steep slope root-soil effect biotechnical reinforcement

Effect of Loading Rate on Lateral Pile-Soil Interaction in Sand Considering Partially Drained Condition

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China Ocean Engineering 2020年第6期34卷 772-783页

作者： ZHU Bin ren Jie WU Lei-ye KONG De-qiong YE Guan-lin yang Qingjie lai Ying MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang UniversityHangzhou 310058China College of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310058China Center for Hypergravity Experimental and Interdisciplinary Research Zhejiang UniversityHangzhou 310058China Department of Civil Engineering Shanghai Jiao Tong UniversityShanghai 200030China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Department of Civil EngineeringHohai UniversityNanjing 210098China

Reliable assessment of the lateral pile–soil interaction is of pronounced importance for the design of mono-pile foundations of offshore wind turbines. As the offshore engineering moves to deeper waters, the diameter of monopiles is getting larger, usually about 5 m and could be up to 8 m, which may lead to partially drained behaviors of sand in the vicinity of the pile and thus imply limitations of conventional design methods in which fully drained conditions were assumed. To shed light on this issue, a fully-coupled finite element model was established using an in-house developed finite element code DBLEAVES, incorporating a cyclic mobility constitutive model that is capable of describing the instantaneous contractive and dilative response of sands simultaneously. Triaxial and centrifuge model tests were conducted to calibrate the constitutive model and validate the pile–soil interaction model respectively. This is followed by a parametric study primarily focusing on the effects of loading rates. The initial stiffness of the p–y curve was found to increase with the loading rate whilst the bearing capacity showed the inverse,and the mechanism behind this phenomenon is examined in detail. Then an explicit model was developed to evaluate the development of excess pore pressure in the pile front upon lateral loading, and an upper boundary of normalized loading rate was identified to distinguish fully and partially drained conditions.

关键词： monopiles partially drained loading rate excess pore pressure