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Spatial Vibration and Its Numerical Analytical Method of Four-high Rolling Mills

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Journal of Iron and Steel Research International 2014年第9期21卷 837-843页

作者： Yong-jiang ZHENG Guang-xian SHEN yi-geng LI Ming LI Hong-min LIU School of Mechanical Engineering Yanshan University National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University

The rolls in contemporary four-high mills cannot be maintained parallel during the rolling process. There- fore, four-high rolling mill vibrations take place in six degree of freedom （DOF） leading to spatial behaviors invol- ving vertical, horizontal, axial, torsional, cross and swinging vibration modes resulting in complex relative motions between the rolls. Two numerical methods, modified Riccati-transfer matrix method （Riccati-TMM） and finite ele- ment method （FEM）, are presented to analyze a spatial vibration characteristic of two four-high rolling mills with different stability. The natural frequency and mode shape of four-high rolling mills are obtained, and the clearance has a great effect on natural frequency and mode shape. In addition, field testing experiment is also conducted to measure natural frequency by power spectrum analysis of rolling mill vibration. Experimental results basically agree with those calculated by Riccati-TMM and FEM, which means that the Riccati-TMM and the FEM can be used for analysis of spatial vibration of four-high rolling mill. Meanwhile, the spatial vibration shows more compound vibra- tion behaviors and the negative effect of horizontal, vertical, cross and swinging vibration modes are effectively con- trolled after redesign of rolling mill. These advantages have a great significance for the rolling mill to be operated with a much higher rolling speed and improved yield of products.

关键词： four-high roiling mill spatial vibration transfer matrix method FEM simulation

Molecular opacities of low-lying states of oxygen molecule

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Chinese Physics B 2020年第2期29卷 206-212页

作者： Gui-ying Liang yi-geng Peng Rui Li Yong Wu Jian-Guo Wang Institute of Applied Physics and Computational Mathematics Beijing 100088China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100084China Department of Physics College of ScienceQiqihar UniversityQiqihar 161006China

The X^3Σg^-,A^'3△u,A^3Σ^u+,1^3Πg,and B^3Σu^-electronic states of oxygen molecule(O2)are calculated by the multiconfiguration self-consisted filed(MRCI)+Q method with the scalar relativistic correction and core-valence correlation *** obtained spectroscopic constants of the low-lying bound states are in excellent agreement with *** on the accurately calculated structure parameters,the opacities of the oxygen molecule at the temperatures of 1000 K,2000 K,2500 K,and 5000 K under a pressure of 100 atm(1 atm=1.01325×10^5 Pa)and the partition functions between 10 K and 10^4 K are *** is found that with the increase of temperature,the opacities for transitions in a long wavelength range are enlarged because of the larger population on excited electronic states at the higher temperatures.

关键词： oxygen molecule transition dipole moments opacities

Molecular Opacity Calculations for Lithium Hydride at Low Temperature

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Chinese Physics Letters 2020年第12期37卷 24-30页

作者： Gui-ying Liang yi-geng Peng Rui Li Yong Wu Jian-Guo Wang Institute of Applied Physics and Computational Mathematics Beijing 100088China Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China Department of Physics College of ScienceQiqihar UniversityQiqihar 161006China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100084China

The opacities of the lithium hydride molecule are calculated for temperatures of 300 K,1000 K,1500 K,and 2000 K,at a pressure of 10 atm,in which the contributions from the five low-lying electronic states are *** ab initio multi-reference single and double excitation configuration interaction(MRDCI)method is applied to compute the potential energy curves(PECs)of the 7 LiH,including four 1∑+states and one 1Πstate,as well as the corresponding transition dipole moments between these *** ro-vibrational energy levels are calculated based on the PECs obtained,together with the spectroscopic *** addition,the partition functions are also computed,and are provided at temperatures ranging from 10 K to 2000 K for 7 LiH,7 LiD,6 LiH,and 6 LiD.

关键词： Lithium hydride partition

Development and Evaluation of a Loop-mediated Isothermal Amplification(LAMP) Assay for Rapid Detection of Chinese Giant Salamander Ranavirus

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Asian Herpetological Research 2015年第1期6卷 59-65页

作者： yi geng Xingxing LIU Yan ZHOU Kaiyu WANG Xi PENG Zhijun ZHONG Xiaoli HUANG Defang CHEN College of Veterinary Medicine Sichuan Agricultural University Department of Aquaculture Sichuan Agricultural University

Loop-mediated isothermal ampliifcation （LAMP） is a novel nucleic acid diagnostic method that can amplify rapidly a target template under isothermal conditions. In this study, a LAMP assay for rapid detection of Chinese giant salamander ranavirus（CGSRV） was developed from culture isolates and clinical samples. The LAMP assay was developed by designing one set of four speciifc primers, targeting the major capsid protein （MCP） gene of CGSRV. Reaction time and temperature were optimal for 40 min at 62°C. The developed LAMP assay is speciifc and highly sensitive for CGSRV detection, the detection limit could reach about 5 copies of cloned viral genomic fragments. The sensitivity of the LAMP assay was about 1000 and 10-fold higher than that of both conventional and nested PCR, respectively. The LAMP ampliifcation produces a typical ladder-like pattern of products on an agarose gel that can be visually inspected after addition of ethidium bromide. The LAMP assay was evaluated further with clinical samples, and the results indicated the suitability and simplicity of the test as a rapid diagnostic tool for the detection of CGSRV.

关键词： CGSRV Loop-mediated isothermal ampliifcation (LAMP) ranavirus Chinese giant salamander

Charge transfer and excitation processes in low energy collisions of He ions with Li atoms

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Research in Astronomy and Astrophysics 2021年第8期21卷 275-284页

作者： Xiao-Xia Wang Kun Wang yi-geng Peng Chun-Hua Liu Ling Liu Yong Wu Heinz-Peter Liebermann Robert J.Buenker yi-Zhi Qu College of Material Sciences and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Institute of Environmental Science Shanxi UniversityTaiyuan 030006China Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China School of Physics Southeast UniversityNanjing 210094China Data Center for High Energy Density Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Fachbereich C-Mathematik und Naturwissenschaften Bergische Universitat WuppertalD-42097 WuppertalGermany

Electron capture between solar wind ions and neutral species has contributed to the understanding of X-ray production from solar system *** charge transfer and excitation processes in solar wind ions of He^(+)(1 s) colliding with Li(1 s^(2)2 s) atoms are studied by utilizing the full quantum-mechanical molecular-orbital close-coupling(QMOCC) method with impact energies of 0.003-2 keV *** of cross sections from single-and multi-configurational calculations for a selfconsistent field(SCF and MCSCF) process are carried *** show that the dominant reaction channels are He(1 s2 l ^(1,3) L)+Li^(+)(1 s^(2) ^(1) S).Good consistency is found among present total and state-selective charge transfer and excitation cross sections with other theoretical and experimental data in the same energy *** to the differences between coupling matrix elements in high-energy states,the charge transfer cross sections calculated from SCF and MCSCF split slightly as E> 0.4 keV *** Stueckelberg oscillations for charge transfer appear in the present *** addition,the differences of cross sections for electron excitation to Li(ls^(2)2 p) in the singlet/triplet molecular states with He+(1 s) are much smaller than those of charge transfer processes because of the similar energy gaps from Li(ls^(2)2 p) to the ground state in singlet/triplet states in the large R region.

关键词： Sun:solar wind ISM:molecules ISM:kinematics and dynamics molecular processes

Semantic segmentation of pyramidal neuron skeletons using geometric deep learning

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Journal of Innovative Optical Health Sciences 2023年第6期16卷 69-76页

作者： Lanlan Li Jing Qi yi geng Jingpeng Wu Fujian Key Lab for Intelligent Processing and Wireless Transmission of Media Information College of Physics and Information Engineering Fuzhou University FuzhouFujian 350116P.R.China Center for Computational Neuroscience Flatiron Institute New York 10010USA

Neurons can be abstractly represented as skeletons due to the filament nature of *** the rapid development of imaging and image analysis techniques,an increasing amount of neuron skeleton data is being *** some scienti fic studies,it is necessary to dissect the axons and dendrites,which is typically done manually and is both tedious and *** automate this process,we have developed a method that relies solely on neuronal skeletons using Geometric Deep Learning(GDL).We demonstrate the effectiveness of this method using pyramidal neurons in mammalian brains,and the results are promising for its application in neuroscience studies.

关键词： Pyramidal neuron geometric deep learning neuron skeleton semantic segmentation point cloud.

Oscillation of S5 helix under different temperatures in determination of the open probability of TRPV1 channel

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Chinese Physics B 2020年第9期29卷 574-580页

作者： Tie Li Jun-Wei Li Chun-Li Pang Hailong An yi-Zhao geng Jing-Qin Wang State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjin 300130China Institute of Biophysics Hebei University of TechnologyTianjin 300401China

Transient receptor potential vanilloid subtype 1 (TRPV1) is a polymodel sensory receptor and can be activated by moderate temperature (≥ 43 ℃). Though extensive researches on the heat-activation mechanism revealed some key elements that participate in the heat-sensation pathway, the detailed thermal-gating mechanism of TRPV1 is still unclear. We investigate the heat-activation process of TRPV1 channel using the molecular dynamics simulation method at different temperatures. It is found that the favored state of the supposed upper gate of TRPV1 cannot form constriction to ion permeation. Oscillation of S5 helix originated from thermal fluctuation and forming/breaking of two key hydrogen bonds can transmit to S6 helix through the hydrophobic contact between S5 and S6 helix. We propose that this is the pathway from heat sensor of TRPV1 to the opening of the lower gate. The heat-activation mechanism of TRPV1 presented in this work can help further functional study of TRPV1 channel.

关键词： TRPV1 heat-activation mechanism molecular dynamics simulation hydrogen bond gating

Pathological Changes in Andrias davidianus Infected with Chinese Giant Salamander Ranavirus

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Asian Herpetological Research 2016年第4期7卷 258-264页

作者： yi geng Matthew James GRAY Kaiyu WANG Defang CHEN Ping OUYANG Xiaoli HUANG Changliang HE Zhijun ZHONG Zexiao YANG College of Veterinary Medicine Sichuan Agricultural University Center for Wildlife Health University of Tennessee Department of Aquaculture Sichuan Agricultural University

Chinese giant salamander ranavirus （CGSRV） is an emerging pathogen in captive populations of the Chinese giant salamander （Andrias davidianus）. We processed 140 morbid Chinese giant salamanders from seven captive breeding populations over five years, and describe the disease associated with CGSRV infection. The most common gross signs were significant swelling of the legs and coelomic cavity, erythema of the legs and ventrum in juveniles; cutaneous erosions and ulcerations in adults, particularly the limbs and the head; and marked petechial or ecchymotic hemorrhages of the internal organs, particularly the liver, spleen and kidney. Histological examination showed degeneration, necrosis, and inflammation in many organs, particularly in the organs where hemorrhage was observed. There was evidence of eosinophilic inclusion bodies in degenerated and necrotic cells. We identified virus particles and empty capsids without viral nucleoid in the inclusion bodies using electron microscopy. Virus particles were hexagonal or round shape, and appeared in paracrystalline arrays, aggregates, or singly. All enveloped viral particles were 140-160 nm. Polymerase chain reaction followed by sequencing verified that the virus particles were CGSRV. These results collectively support that CGSRV was the etiologic agent responsible for these mass die-offs of the Chinese giant salamander. The pathology described herein will be useful in diagnosing cases of ranaviral disease caused by CGSRV, and provide evidence that this pathogen is a significant threat to the Chinese giant salamander.

关键词： pathology CGSRV Andrias davidianus ranavirus China

Ab Initio Study of Single-and Double-Electron Capture Processes in Collisions of He^(2+) Ions and Ne Atoms

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Chinese Physics Letters 2021年第11期38卷 30-36页

作者： Xiao-Xia Wang Kun Wang yi-geng Peng Chun-Hua Liu Ling Liu Yong Wu Heinz-Peter Liebermann Robert JBuenker yi-Zhi Qu College of Material Sciences and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Institute of Environmental Science Shanxi UniversityTaiyuan 030006China Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China School of Physics Southeast UniversityNanjing 210094China Data Center for High Energy Density Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Fachbereich C-Mathematik und Naturwissenschaften Bergische Universitat WuppertalD-42097 WuppertalGermany

The single-and double-electron capture(SEC, DEC) processes of He^(2+) ions colliding with Ne atoms are studied by utilizing the full quantum-mechanical molecular-orbital close-coupling method. Total and state-selective SEC and DEC cross sections are presented in the energy region of 2 eV/u to 20 keV/u. Results show that the dominant reaction channel is Ne^(+)(2s2p^(6) ^(2)S) + He^(+)(1s) in the considered energy region due to strong couplings with the initial state Ne(2s^(2)2p^(6)^(1)S) + He^(2+) around the internuclear distance of 4.6 a.u. In our calculations, the SEC cross sections decrease initially and then increase whereby, the minimum point is around 0.38 keV/u with the increase of collision energies. After considering the effects of the electron translation factor(ETF), the SEC cross sections are increased by 15%–25% nearby the energy region of keV/u and agree better with the available results. The DEC cross sections are smaller than those of SEC because of the larger energy gaps and no strong couplings with the initial state. Due to the Demkov-type couplings between DEC channel Ne^(2+)(2s^(2)2p^(4)^(1)S) + He(1s^(2)) and the dominating SEC channel Ne^(+)(2s2p^(6) ^(2)S) + He^(+)(1s), the DEC cross sections increase with increasing impact energies. Good consistency can also be found between the present DEC and the experimental measurements in the overlapping energy region.

关键词： SEC DEC Ab Initio Study of Single-and Double-Electron Capture Processes in Collisions of He Ions and Ne Atoms