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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 51-63页

作者： Li Zhenya Pan Yunchao He Xianbin lv chong Mohammad Towhid Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China Geotechnical Research Institute Hohai UniversityNanjing 210098China MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang UniversityHangzhou 310058China

This research is concentrated on the longitudinal vibration of a tapered pipe pile considering the vertical support of the surrounding soil and construction ***,the pile-soil system is partitioned into finite segments in the vertical direction and the Voigt model is applied to simulate the vertical support of the surrounding soil acting on the pile *** surrounding soil is divided into finite ring-shaped zones in the radial direction to consider the construction ***,the shear complex stiffness at the pile-soil interface is derived by solving the dynamic equilibrium equation for the soil from the outermost to innermost *** displacement impedance at the top of an arbitrary pile segment is obtained by solving the dynamic equilibrium equation for the pile and is combined with the vertical support of the surrounding soil to derive the displacement impedance at the bottom of the upper adjacent ***,the displacement impedance at the pile head is obtained based on the impedance function transfer ***,the reliability of the proposed solution is verified,followed by a sensitivity analysis concerning the coupling effect of the pile parameters,construction disturbance and the vertical support of the surrounding soil on the displacement impedance of the pile.

关键词： tapered pipe pile longitudinal vibration vertical support of the surrounding soil construction disturbance displacement impedance

Recovering from prolonged cardiac arrest induced by electric shock:A case report

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World Journal of Clinical Cases 2024年第13期12卷 2248-2253页

作者： Jian Zhang Yan-Ru Qiao Ya-Dong Yang Guo-Zheng Pan chong-Qing lv Department of General Surgery Shengli Oilfield Central HospitalDongying 257000Shandong ProvinceChina Department of Emergency Medicine Shengli Oilfield Central HospitalDongying 257000Shandong ProvinceChina

BACKGROUND Cardiac arrest(CA)induced by electric shock is a rare occurrence,particularly in cases of prolonged ***,there is limited literature on similar incidents,and we present a relevant case *** SUMMARY A 27-year-old Asian male man,experiencing respiratory CA due to electric shock,was successfully restored to sinus rhythm after 50 min of cardiopulmonary resuscitation and 8 electrical defibrillation *** the subsequent stages,the patient received multiple organ function protection measures,leading to a successful recovery and eventual discharge from the *** Prolonging resuscitation time can enhance the chances of survival for patients,this study provide valuable insights into the management of electric shock-induced CA.

关键词： Electric shock Cardiac arrest Prolonged cardiopulmonary resuscitation Cerebral resuscitation Case report

Enhanced photon emission and pair production in laser-irradiated plasmas

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Plasma Science and Technology 2017年第7期19卷 34-39页

作者： Feng WAN chong lv Moran JIA Baisong XIE Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education and College of Nuclear Science and Technology Beijing Normal University Beijing 100875 People＇s Republic of China Beijing Radiation Center Beijing 100875 People＇s Republic of China

Enhanced photon emission and pair production due to heavy ion mass in the interaction of an ultraintense laser with overdense plasmas is explored by particle-in-cell simulation. It is found that plasmas with heavier ion mass can excite a higher and broader electrostatic field, which causes the enhancement of backward photon emission. The pair yields are then enhanced due to the increase of backwards photons colliding with the incoming laser pulse. By examining the density evolution and angle distribution of each particle species, the origin of pair yield enhancement is clarified.

关键词： laser-plasma interaction physics ",/-ray and particle generation positron emission,PIC simulation

Research progress on naturally-occurring and semi-synthetic ocotillol-type ginsenosides in the genus Panax L.(Araliaceae)

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Chinese Journal of Natural Medicines 2021年第9期19卷 648-655页

作者： NIU Xue-Ni LUO Wen lv chong-Ning LU Jin-Cai Department of Traditional Chinese Medicine Shenyang Pharmaceutical UniversityShenyang 110016China

Ocotillol(OT)-type ginsenosides,one subtype of ginsenosides,consist of a dammarane skeleton and a tetrahydrofuran *** naturally-occurring OT-type ginsenosides exist in Panax species,particularly in Panax quinquefolius,which may be attributed to the warm and humid climate of its native *** now,merely 28 types of naturally-occurring OT-type ginsenosides have been *** contrast,semi-synthesized OT-type ginsenosides are attracted considerable *** ginsenosides can be obtained through oxidation and cyclization of side chains of dammarane-type ginsenosides,and other methods,which may change their physical and chemical properties and further improve their *** is also notable that the pharmacological activities of ginsenosides are closely related to the stereoisomers caused by the configuration at ***-synthesis of OT-type ginsenosides can facilitate our understanding of the biosynthesis,transformation and metabolism of OT-type ginsenosides in the *** review will systematically summarize the research progress on naturally-occurring and semi-synthetic OT-type ginsenosides,which provides a theoretical basis for their bioactivity-guided research.

关键词： Ocotillol-type ginsenosides Panax species Panax quinquefolius Structure-activity relationship

A trajectory planning method on error compensation of residual height for aero-engine blades of robotic belt grinding

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Chinese Journal of Aeronautics 2022年第4期35卷 508-520页

作者： chong lv Lai ZOU Yun HUANG Xifan LIU Zhaorui LI Mingwang GONG Heng LI State Key Laboratory of Mechanical Transmission Chongqing UniversityChongqing 400044China

While the traditional trajectory planning methods are used in robotic belt grinding of blades with an uneven machining allowance distribution, it is hard to obtain the preferable profile accuracy and surface quality to meet the high-performance requirements of aero-engine. To solve this problem, a novel trajectory planning method is proposed in this paper by considering the developed interpolation algorithm and the machining allowance threshold. The residual height error obtained from grinding experiments of titanium alloy sample was compensated to modify the calculation model of row spacing, and a new geometric algorithm was presented to dynamically calculate the cutter contact points based on this revised calculation model and the dichotomy method. Subsequently, the off-line machining program is generated based on a double-vector controlling method to obtain an optimal contact posture. On this basis, three sets of robotic grinding tests of titanium alloy blades were conducted to investigate the advantages of the proposed *** comparative experimental results revealed that the presented algorithm had improved the surface profile accuracy of blade by 34.2% and 55.1%, respectively. Moreover, the average machined surface roughness was achieved to 0.3 μm and the machining efficiency was obviously promoted. It is concluded that this research work is beneficial to comprehensively improve the machined quality of blades in robotic belt grinding.

关键词： Aero-engine blade Double-vector controlling Interpolation algorithm Residual height error Robotic grinding

Pair production in strong SU（2） background fields

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Frontiers of physics 2017年第5期12卷 143-150页

作者： Mo-Ran Jia Zi-Liang Li chong lv Feng Wan Bai-Song Xie College of Nuclear Science and Technology Beijing Normal University Beijing 100875 China Beijing Radiation Center Beijing 100875 China

Fermion particle pair production in strong SU（2）-gauge chromoelectric fields is studied using the Boltzmann-Vlasov equation in a classical way. The existence of a preproduction process in a classical description is shown using the distribution evolution of non-Abelian particle production. It is interesting to find that the distribution of the particle number density is centered on two islands and shows a split on the color charge sphere as it evolves, ultimately reaching a steady state that is related to the amplitude and variation of the field.

关键词： pair production SU(2)-gauge chromoelectric field classical and semiclassical technique Boltzmann-Vlasov equation

Pair Production in Chromoelectric Field with Back Reaction

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Communications in Theoretical Physics 2018年第10期70卷 430-438页

作者： Mo-Ran Jia Feng Wan chong lv Bai-Song Xie College of Nuclear Science and Technology Beijing Normal University Beijing 100875 China Beijing Radiation Center Beijing 100875 China

Massless quark pair production in SU(2) gauge chromoelectric field is investigated by solving the Wigner function with back reaction. The temporal evolution of specific field and its current are obtained self consistently. For the quark distribution function, both its time and momentum dependence are studied. In particular, some interesting phenomena are found, for example, the more abundant symmetry or/and antisymmetry characteristics, the existence of the attractive basin structure and the existence of the momentum "gap" in the quark distribution and so on. All the phenomena are associated with the quark-gluon plasma oscillation, which due to the back reaction effect. The study and analysis qualitatively about the components of the Wigner function are expected to be helpful to deepen the understanding of the QCD vacuum.

关键词： particle production in Non-Abelian gauge covariant Wigner function in Non-Abelian gauge Schwinger mechanism

Facile molybdenum and aluminum recovery from spent hydrogenation catalyst

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Chinese Journal of Chemical Engineering 2024年第5期69卷 72-78页

作者： Zhenhui lv Jianan Li Dong Xue Tao Yang Gang Wang chong Peng State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024China Dalian Research Institute of Petroleum and Petrochemicals SINOPECDalian 116041China

Industrial catalyst waste has emerged as a hazardous pollutant that requires safe and proper disposal after the unloading *** a valuable and sustainable strategy for its treatment is a significant challenge compared to traditional *** this study,we present a facile method for the recovery of molybdenum and aluminum contents from spent Mo-Ni/Al_(2)O_(3) hydrogenation catalysts through crystallization separation and ***,the recovered molybdenum and aluminum are utilized as active metals and carriers for the preparation of new *** properties were thoroughly analyzed and investigated using various characterization *** hydrogenation activity of these newly prepared catalysts was evaluated on a fixed-bed small-scale device and compared with a reference catalyst synthesized from commercial raw ***,the hydrogenation activity of the catalysts was further assessed by using the entire distillate oil of coal liquefaction as the raw oil,specifically focusing on denitrogenation and aromatic *** work not only offers an effective solution for recycling catalysts but also promotes sustainable development.

关键词： Waste treatment Alumina Hydrogenation Catalyst Crystallization Precipitation

New anti-pulmonary fibrosis prenylflavonoid glycosides from Epimedium Koreanuin

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Chinese Journal of Natural Medicines 2022年第3期20卷 221-228页

作者： ZHAO Yu-Dan ZHANG Xin YANG Wan-Yue ZHANG Rui-Qi MU Lin-Tong HAN Ling lv chong-Ning LU Jin-Cai School of Traditional Chinese Materia Medica Shenyang Pharmaceutical UniversityShenyang 110016China Liaoning Provincial Key Laboratory of TCM Resources Conservation and Development Shenyang Pharmaceutical UniversityShenyang 110016China NERCfor the Pharmaceutics of Traditional Chinese Medicines Benxi 117004China

Four new prenylflavonoid glycosides,namely koreanoside H-K(1-4),together with eleven known ones(5-15)were isolated from the leaves of Epimedium koreanum *** structures were elucidated by ID NMR,2D NMR,HR-ESI-MS,IR and *** identification of the sugar moieties was carried out by means of acid hydrolysis and HPLC analysis of their *** is worth noting that compound 3 and compound 4 were elucidated to contain fucose and quinovose moieties,which were two extremely rare sugar units from the genus *** anti-pulmonary fibrosis activity of the new compounds was evaluated using A549 cell *** 1,2 and 4 showed significant anti-pulmonary fibrosis activities.

关键词： Epimedium koreanum Prenylflavonoid glycoside Anti-pulmonary fibrosis

High density γ-ray emission and dense positron production via multi-laser driven circular target

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Plasma Science and Technology 2019年第8期21卷 34-42页

作者： Yajuan HOU Baisong XIE chong lv Feng WAN Li WANG Nureli YASEN Haibo SANG and Guoxing XIA Key Laboratory of Beam Technology of the Ministry of Education and College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing100875People’s Republic of China Beijing Radiation Center Beijing100875People’s Republic of China School of Physics and Astronomy University of ManchesterManchester M139PLUnited Kingdom The Cockcroft Institute WarringtonWA44ADUnited Kingdom

A diamond-like carbon circular target is proposed to improve γ-ray emission and pair production with a laser intensity of 8×1022 W cm-2by using 2D particle-in-cell simulations with quantum *** is found that the circular target can enhance the density of γ-photons significantly more than a plane target, when two colliding circularly polarized lasers irradiate the *** multi-laser irradiating the circular target, the optical trap of lasers can prevent the high energy electrons accelerated by laser radiation pressure from ***, γ-photons with a high density of beyond 5000 ncare obtained through nonlinear Compton ***, 2.7×1011 positrons with an average energy of 230 MeV are achieved via the multiphoton Breit-Wheeler *** an ultrabright γ-ray source and dense positron source can be useful in many *** optimal target radius and laser mismatching deviation parameters are also discussed in detail.

关键词： e+e-pairs production γ-ray emission Breit-Wheeler(BW) process Compton backscattering(NCBS) process particle-in-cell(PIC)