检索结果-南通市图书馆

Cosmic-ray helium nuclei measurement with the calorimeter of the Alpha Magnetic Spectrometer

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2022年第3期6卷 427-432页

作者： Feng-ze Zhang Zhi-cheng Tang Zu-Hao Li cheng Zhang Ze-Tong Sun Jia-Yu Hu Shang-Lin Li Guo-Ming chen he-sheng chen Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose The distributions of energy responses of helium measured by the electromagnetic calorimeter(ECAL)of Alpha Magnetic Spectrometer(AMS-02)in Monte-Carlo do not agree with those in real data,thus using energy response matrix obtained from Monte-Carlo to measure the cosmic ray helium spectrum is not ***,the spectrum measured with ECAL based on raw Monte-Carlo would be different from the real *** purpose is to correct the response matrix to measure helium spectrum with *** The energy measured by ECAL of AMS-02 provides in-ﬂight correction for the energy response matrix in *** The spectrum based on corrected response matrix is consistent with the AMS collaboration published *** It is feasible to measure helium spectrum with ECAL with corrected energy response matrix.

关键词： Cosmic rays helium spectrum Electromagnetic calorimeter Monte Carlo simulation Fig.1 a The structure of ECAL b The indication of PMTs in one superlayer

Improvement of cosmic-ray protonmeasurement with the electromagnetic calorimeter of the Alpha Magnetic Spectrometer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2021年第1期5卷 90-94页

作者： Fei Zhao Zhi-cheng Tang Zu-Hao Li cheng Zhang Ze-Tong Sun Feng-Ze Zhang Jia-Yu Hu Guo-Ming chen he-sheng chen Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose The energy response of protons measured by electromagnetic calorimeter(ECAL)of Alpha Magnetic Spectrometer(AMS-02)shows disagreement between Monte Carlo(MC)simulation and ***,using the response matrix from MC to apply the energy unfolding,which is crucial for cosmic-ray proton spectrum measurement,is *** a result,cosmic-ray proton spectrum measured by ECAL based on raw MC would be different from the published results(based on the momentum measurement)by *** purpose is tuning the response matrix to agree with *** The independent energy measurement by AMS-02 magnetic spectrometer provides in-flight calibration for *** distributions of proton energy measured by ECAL in MC are corrected after the *** The proton spectrum based on the tuned response matrix is consistent with the published *** The matrix tuning is effective for the energy unfolding for cosmic-ray proton spectrum measurement.

关键词： Cosmic rays Proton spectrum Electromagnetic calorimeter Monte Carlo simulation

On-orbit equalization of the electromagnetic calorimeter of the Alpha Magnetic Spectrometer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2021年第3期5卷 430-433页

作者： Ze-Tong Sun Jia-Yu Hu Zhi-cheng Tang cheng Zhang Feng-Ze Zhang Shang-Lin Li Mei-Jun Liang Zu-Hao Li Guo-Ming chen he-sheng chen Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of Sciences19B Yuquan RoadBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose The Alpha Magnetic Spectrometer(AMS-02)will continuously collect data for the lifetime of the International Space Station(ISS).On-orbit equalization must be performed to ensure the accuracy of the AMS energy measurement(~1%)by the electromagnetic calorimeter(ECAL).Methods The equalization is performed using the most probable value(MPV)of the cosmic-ray proton minimum ionizing particle(MIP).Kalman filter technique is used to improve the *** The precision of the equalization with proton MIP is(7.206±0.003)%and improved to(2.388±0.002)%after the Kalman *** the toy Monte Carlo(MC)simulation,the error of the energy reconstruction is about 1.4%and 0.5%due to the 7.2%and 2.4%equalization accuracy,*** About 1.4%error due to~7%equalization precision does not match the AMS *** the improvement from the Kalman filter,the energy reconstruction error from the equalization is reduced to 0.5%,which can fulfill the AMS requirement.

关键词： Equalization Electromagnetic calorimeter Kalman filter Proton MIP Energy resolution

Improvements on the particle identification with dead cell and side leakage corrections for the electromagnetic calorimeter of the Alpha Magnetic Spectrometer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2018年第2期2卷 14-18页

作者： Shao-Wen Zhang Zu-Hao Li Xue-Qiang Wang cheng Zhang Zhi-cheng Tang Suzan Basegmez du Pree Fei Zhao Ze-Tong Sun Guo-Ming chen he-sheng chen Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of ScienceBeijing 10049China University of Chinese Academy of Sciences Beijing 100049China

Background The electromagnetic calorimeter(ECAL)of the Alpha Magnetic Spectrometer(AMS-02)measures the energy of electrons/positrons and separates them from ***,there are five dead cells in the ECAL which affect the reconstructed energy of *** particle identification power of the ECAL decreases when particles pass through these dead cells or close to the ECAL *** To improve the ECAL particle identification for particles pass through these dead cells or close to the ECAL *** An improved ECAL particle identification estimator using the electromagnetic shower shape is developed with dead cell and side leakage *** For events passing through dead cells,with this new estimator,the proton rejection power is improved by a factor of 2.2 and positron purity is improved from 31 to 50%in the energy range of 500–800 *** The new estimator works well for event passing through dead cells or close to the ECAL border.

关键词： Electron/proton separation Electromagnetic calorimeter(ECAL) Boosted Decision Trees(BDT) Dead cell correction Side leakage correction

Improvement in the 3D shower shapes description in the Monte Carlo simulation for a lead-scintillating fiber electromagnetic calorimeter

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2019年第3期3卷 136-140页

作者： Xue-Qiang Wang Zu-Hao Li Zhi-cheng Tang cheng Zhang Fei Zhao Ze-Tong Sun Feng-Ze Zhang Jia-Yu Hu Guo-Ming chen he-sheng chen Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Background The lead-scintillating fiber electromagnetic calorimeter(ECAL)of the Alpha Magnetic Spectrometer measures the energy of positrons/electrons and separates them from *** electromagnetic shower shapes from Monte Carlo(MC)simulation and data show *** Tuning the MC to make the shower shapes from MC and data agree with each *** The tuning is based on a 3D electromagnetic shower *** After tuning,the electromagnetic shower shapes are well described by MC up to *** a result,the output of ECAL electron/proton separation estimator,ECAL BDT,shows thatMCand data are in good *** proton rejection power of the ECAL BDT trained with MC electron samples is improved by a factor of 5 at∼800 GeV compared to the one trained with data.

关键词： Electromagnetic calorimeter Monte Carlo simulation 3D shower shape Electron proton separation estimator

Search for a lighter Higgs boson in the Next-to-Minimal Supersymmetric Standard Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2018年第10期42卷 51-58页

作者： Jun-Quan Tao M.Aamir Shahzad Si-Jing Zhang Chu Wang Yu-Qiao Shen Guo-Ming chen he-sheng chen S.Gascon-Shotkina L.Finco C.Camen Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Institut de Physique Nucleaire de Lyon Universite de LyonUniversite Claude Bernard Lyon 1CNRS-IN2P3Villeurbanne 69622France Changzhou Institute of Technology Changzhou 213032China

Following the discovery of the Higgs boson with a mass of approximately 125 GeV at the LHC, many studies have been performed from both the theoretical and experimental viewpoints to search for a new Higgs Boson that is lighter than 125 GeV. We explore the possibility of constraining a lighter neutral scalar Higgs boson hi and a lighter pseudo-scalar Higgs boson al in the Next-to-Minimal Supersymmetric Standard Model by restricting the next-to-lightest scalar Higgs boson h2 to be the one observed at the LHC after applying the phenomenological constraints and those from experimental measurements. Such lighter particles are not yet completely excluded by the latest results of the search for a lighter Higgs boson in the diphoton decay channel from LHC data. Our results show that some new constraints on the Next-to-Minimal Supersymmetric Standard Model could be obtained for a lighter scalar Higgs boson at the LHC if such a search is performed by experimental collaborations and more data. The potentials of discovery for other interesting decay channels of such a lighter neutral scalar or pseudo-scalar particle are also discussed.

关键词： Next-to-Minimal Supersymmetric Standard Model lighter Higgs boson discovery potentials

Online Surface Roughness Detection of Cold-Rolled Strip Steel Based on Adaptive Regression Smooth Filtering

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Online Surface Roughness Detection of Cold-Rolled Strip Stee...

An Online Intelligent Control Method for Surface Roughness of Cold-Rolled Strip Steel

第37届中国控制会议

作者： sheng-he chen Jian-Guo Wang Ting-Quan Gu Cold Rolling Department Baoshan Iron & Steel Co. Ltd School of Mechatronical Engineering and Automation Shanghai University Shanghai Key Lab of Power Station Automation Technology Central Research Institute(R.& D. Center) Baoshan Iron & Steel Co. Ltd

This paper presents an adaptive regression smoothing filtering method for on-line surface roughness detection of coldrolled strip steel with high precision. This method overcomes the shortcomings of the conventional light scattering method using low-pass filter to identify the on-line inspection data of strip surface roughness and improve the accuracy of on-line testing of surface roughness. The initial parameters of on-line surface roughness detection are pre-treated by robust local weighted regression. Establishing the quadratic weight function, to achieve weight updated based on the relative position of historical data and the current data, and also based on the residual of the smoothing value and the actual value. When the adjacent data changes beyond the set threshold, the window width of the smoothing window is reduced automatically to realize the adaptive step-by-step regression smoothing filtering of the on-line roughness detection data. This improves the on-line inspection accuracy of cold-rolled strip surface roughness, and better meets the requirements of downstream users.

关键词： Cold-rolled strip Surface roughness On-line detection Regression Smoothing Adaptive Filtering High-pass filter

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

An Online Intelligent Control Method for Surface Roughness o...

Transforming growth factor-beta 1 enhances discharge activity of cortical neurons

第37届中国控制会议

The control of surface roughness is of great significance for measuring the quality characteristics of cold-rolled steel strip. At present, the conventional method is used to monitor the surface roughness of steel strip by random sample inspection,off-line analysis and test, and on-line adjustment of production process, but the method is of some hysteretic nature and discontinuity. To this end, the paper presents an on-line intelligent control method for surface roughness of the cold-rolled steel strip, adjusting parameters of the skin-pass process in real time and reducing the fluctuation of surface roughness of strip steel. To establish the fuzzy neural network control model of the corresponding relationship between the parameters of the skin-pass process and the surface roughness of steel strip, the deviation between the online detection value and the target value of the surface roughness is taken as the input of the model, so is the differential value of deviation. In addition, the skin-pass rolling force is used as the output. Learning and training fuzzy neural network to get a fuzzy neural network online prediction control model that is applied to continuous treatment unit for cold rolling strip steel. By measuring the surface roughness of steel strip, the system adjusts the skin-pass rolling force in real time. At the same time, to keep the mechanical properties of the steel strip and the strip shape, the system optimizes skin-pass rolling tension and bending force accordingly to realize on-line intelligent control for the surface roughness of steel strip. The proposed system can improve the control accuracy of surface roughness, which can even better satisfy the requirements of downstream users.

关键词： Cold rolled steel strip Surface roughness On-line measurement Fuzzy neural network Intelligent control

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 548-556页

作者： Zhihui Ren Tian Li Xueer Liu Zelin Zhang Xiaoxuan chen Weiqiang chen Kangsheng Li Jiangtao sheng Department of Microbiology and Immunology Guangdong Provincial Key Laboratory of Infectious Diseases and Molecular ImmunopathologyShantou University Medical CollegeShantouGuangdong ProvinceChina Department of Neurosurgery First Affiliated Hospital of Shantou University Medical CollegeShantouGuangdong ProvinceChina

Transforming growth factor-beta 1(TGF-β1)has been extensively studied for its pleiotropic effects on central nervous system *** neuroprotective or neurotoxic effects of TGF-β1 in specific brain areas may depend on the pathological process and cell types ***-gated sodium channels(VGSCs)are essential ion channels for the generation of action potentials in neurons,and are involved in various neuroexcitation-related ***,the effects of TGF-β1 on the functional properties of VGSCs and firing properties in cortical neurons remain *** this study,we investigated the effects of TGF-β1 on VGSC function and firing properties in primary cortical neurons from *** found that TGF-β1 increased VGSC current density in a dose-and time-dependent manner,which was attributable to the upregulation of Nav1.3 *** VGSC current density and Nav1.3 expression were significantly abolished by preincubation with inhibitors of mitogen-activated protein kinase kinase(PD98059),p38 mitogen-activated protein kinase(SB203580),and Jun NH2-terminal kinase 1/2 inhibitor(SP600125).Interestingly,TGF-β1 significantly increased the firing threshold of action potentials but did not change their firing rate in cortical *** findings suggest that TGF-β1 can increase Nav1.3 expression through activation of the ERK1/2-JNK-MAPK pathway,which leads to a decrease in the firing threshold of action potentials in cortical neurons under pathological ***,this contributes to the occurrence and progression of neuroexcitatory-related diseases of the central nervous system.

关键词： central nervous system cortical neurons ERK firing properties JNK Nav1.3 p38 transforming growth factor-beta 1 traumatic brain injury voltage-gated sodium currents