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MATHEMATICAL MODELLING OF PHASE TRANSFORMATION FROM HOT-DEFORMED AUSTENITE IN LOW CARbON STEELS

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Acta Metallurgica Sinica(English Letters) 2003年第3期16卷 204-210页

作者： y.b.xu G.D.Wang X.H.Liu State Key Laboratory of Rolling And Automation Northeastern University Shenyang 110004 ChinaState Key Laboratory of Rolling And AutomationNortheastern University Shenyang 110004 ChinaState Key Laboratory of Rolling And AutomationNortheastern University Shenyang 110004 China

On the basis of superelement model, Cahn’s transformation kinetics theory and Scheil’s additivity rule, the CCT diagrams and transformation kinetics in low carbon steel were predicted considering both undeformed and deformed conditions. The influence of deformation on phase equilibria and transformation incubation period was evaluated quantitatively. The recrystallization kinetics and the evolution of dislocation density were calculated during continuous cooling. The results show deformation considerably shortens transformation incubation period, accelerates transformation kinetics and makes CCT curve shift leftwards. The calculated CCT diagrams and the volume fraction of each phase are in good agreement with measurements.

关键词： thermodynamics transformation kinetics continuous cooling hot-deformed austenite

CALCULATION OF TRANSFORMATION VOLUME FRACTION TO HQ590 HOT ROLLED STRIP STEEL DURING CONTINUOUS COOLING

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Acta Metallurgica Sinica(English Letters) 2004年第5期17卷 754-760页

作者： X.G.Zhou X.M.Zhao y.b.xu D.Wu TheStateKeyLab.ofRollingTechnologyandAutomation NortheasternUniversityShenyang110004China

On the basis of phase transformation kinetics, the transformation of γ→α,P,b have been investigated through considering the effect of deformation. The calculation methods of volume fraction have also been given. Co... 详细信息

关键词： transformation kinetics volume fraction nucleation rate

The design and performance of charged particle detector onboard the GECAM mission

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Radiation Detection Technology and Methods 2022年第1期6卷 53-62页

作者： y.b.xu X.Q.Li X.L.Sun S.yang H.Wang W.X.Peng X.H.Liang K.Gong y.Q.Liu D.y.Guo X.y.Zhao C.y.Li Z.H.An J.J.He X.J.Liu X.y.Wen S.L.Xiong Fan Zhang D.L.Zhang C.y.Zhang C.Cai Z.Chang G.Chen C.Chen y.y.Du M.Gao R.Gao D.J.Hou y.G.Li G.Li L.Li X.F.Li M.S.Li F.J.Lu H.Lu b.Meng F.Shi J.Z.Wang y.S.Wang H.Z.Wang X.Wen S.Xiao y.P.xu J.W.yang Q.b.yi S.N.Zhang C.M.Zhang F.Zhang y.Zhao X.Zhou Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

background The Gravitational wave highly energetic Electromagnetic Counterpart All-sky Monitor(GECAM)is dedicated to detecting gravitational wave gamma-ray *** is capable of all-sky monitoring over and discovering gamma-ray bursts and new radiation *** consists of two microsatellites,each equipped with 8 charged particle detectors(CPDs)and 25 gamma-ray detectors(GRDs).Purpose The CPD is used to measure charged particles in the space environment,monitor energy and flow intensity changes,and identify between gamma-ray bursts and space charged particle events in conjunction with *** CPD uses plastic scintillator as the sensitive material for detection,silicon photomultiplier array as the optically readable device,and the inlaid Am-241 radioactive source as the onboard calibration *** In this paper,we will present the working principle,physical design,functional implementation and preliminary performance test results of the *** a result,the energy range of electron,gamma-ray detection efficiency and dead time are tested to be better than the indexes required through the ground calibration experiment.

关键词： GECAM CPD SiPM

The data acquisition algorithm designed for the SiPM-based detectors of GECAM satellite

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Radiation Detection Technology and Methods 2022年第1期6卷 70-77页

作者： y.Q.Liu K.Gong X.Q.Li X.y.Wen Z.H.An C.Cai Z.Chang G.Chen C.Chen y.y.Du M.Gao R.Gao D.y.Guo J.J.He D.J.Hou y.G.Li C.y.Li G.Li L.Li X.F.Li M.S.Li X.H.Liang X.J.Liu F.J.Lu H.Lu b.Meng W.X.Peng F.Shi X.L.Sun H.Wang J.Z.Wang y.S.Wang H.Z.Wang X.Wen S.Xiao S.L.Xiong y.b.xu y.P.xu S.yang J.W.yang Q.b.yi Fan Zhang D.L.Zhang S.N.Zhang C.y.Zhang C.M.Zhang Fei Zhang X.y.Zhao y.Zhao X.Zhou Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Physics and Space Science College China West Normal UniversityNanchong 637002China

background The Gravitational Wave High-energy Electromagnetic Counterpart All-sky Monitor(GECAM)consists of 2 microsatellites,each of which contains 25 GRD(Labr3)detectors and 8 CPD(plastic scintillator)*** silicon photomultiplier(SiPM)array is used to read each *** output signal of these detectors with SiPM array is very special and challenging to *** this study,a novel data acquisition(DAQ)algorithm for these detectors is designed and implemented,and the content of the output event packet is *** and Conclusion The performances,including the event acquisition efficiency of this DAQ algorithm,are extensively verified through experimental *** the on-ground and in-flight tests,this algorithm has excellent performance despite the very limited resources and short development time of GECAM mission.

关键词： Silicon photomultiplier Digital waveform processing Data acquisition

The design and performance of GRD onboard the GECAM satellite

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Radiation Detection Technology and Methods 2022年第1期6卷 43-52页

作者： Z.H.An X.L.Sun D.L.Zhang S.yang X.Q.Li X.y.Wen K.Gong X.H.Liang X.J.Liu y.Q.Liu y.G.Li S.L.Xiong y.b.xu Fan Zhang X.y.Zhao C.Cai Z.Chang G.Chen C.Chen y.y.Du P.y.Feng M.Gao R.Gao D.y.Guo J.J.He D.J.Hou C.y.Li G.Li L.Li X.F.Li M.S.Li F.J.Lu H.Lu b.Meng W.X.Peng F.Shi H.Wang J.Z.Wang y.S.Wang H.Z.Wang X.Wen S.Xiao y.P.xu J.W.yang Q.b.yi S.N.Zhang C.y.Zhang C.M.Zhang Fei Zhang y.Zhao X.Zhou CAS Institute of High Energy PhysicsBeijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China 3 Xiangtan UniversityXiangtan 411105China 4 Beijing Normal UniversityBeijing 110875China Xiangtan University Xiangtan 411105China beijing Normal University Beijing 110875China

background Each GECAM satellite payload contains 25 gamma-ray detectors(GRDs),which can detect gamma-rays and particles and can roughly localize the Gamma-Ray bursts(GRbs).GRD was designed using lanthanum bromide(Labr3)crystal as the sensitive material with the rear end coupled with silicon photomultiplier(SiPM)array for *** In aerospace engineering design of GRD,there are many key points to be *** this paper,we present the specific design scheme of GRD,the assembly and the performance test results of *** based on Monte Carlo simulation and experimental test results,the specific schematic design and assembling process of GRD were *** being fully assembled,the GRDs were conducted performance tests by using radioactive source and also conducted random vibration *** and conclusion The test results show that all satellite-borne GRDs have energy resolutionbration test shows that GRD can maintain in a stable performance,which meets the requirement of spatial application.

关键词： Lanthanum bromide scintillator SiPM array GECAM Gamma-ray detector Energy resolution

Dedicated SiPM array for GRD of GECAM

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Radiation Detection Technology and Methods 2022年第1期6卷 63-69页

作者： D.L.Zhang X.L.Sun Z.H.An X.Q.Li X.y.Wen K.Gong C.Cai Z.Chang G.Chen C.Chen y.y.Du M.Gao R.Gao D.y.Guo J.J.He D.J.Hou y.G.Li C.y.Li G.Li L.Li X.F.Li M.S.Li X.H.Liang X.J.Liu y.Q.Liu F.J.Lu H.Lu b.Meng W.X.Peng F.Shi H.Wang J.Z.Wang y.S.Wang H.Z.Wang X.Wen S.Xiao S.L.Xiong y.b.xu y.P.xu S.yang1 X.Zhou J.W.yang Fan Zhang S.N.Zhang C.y.Zhang C.M.Zhang Fei Zhang X.y.Zhao Institute of High Energy Physics CASBeijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China

Purpose The discovery of gravitational waves and gamma-ray bursts heralds the era of multi-messenger *** the adoption of two small satellites to achieve the all-sky monitoring of gamma-ray bursts,the gravitational wave highenergy electromagnetic counterpart all-sky monitor(GECAM)possesses a quasi-real-time early warning ability and plays an important role in positioning the sources of gravitational waves and in subsequent *** satellite of GECAM was fitted with 253-inch-diameter gamma-ray detectors(GRD),covering an energy range of 8–2 *** have adopted silicon photomultiplier tubes(SiPM)in lieu of photomultiplier tubes(PMT)to adapt to the dimensional limitations of *** A unique 3-inch circular SiPM array was *** this design,646×6 mm chips were arranged evenly in a circular manner with the seams filled with reflecting films,thus achieving satisfactory uniformity of light *** integrated pre-amplifier circuit on the back of the SiPM array adopted two-level grouping and summing;further,it achieved a satisfactory signal-to-noise *** high-gain and low-gain channels were adopted to achieve a large dynamic range,and two independent power supply units were used,where each unit can be closed separately,thus improving *** Performance studies show that this SiPM array meets the requirements of *** A 3-inch SiPM array have been developed that uses grouped summation,reflective films,a circular arrangement,two groups of independent power supplies,high-and low-gain signals,differential signal output technologies,*** solution can be used not only for GECAM,but also as a general solution for SiPM-based scintillation detectors.

关键词： SiPM GECAM Gamma-ray Signal-to-noise ratio Reflecting film Pre-amplifier

The technology for detection of gamma-ray burst with GECAM satellite

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Radiation Detection Technology and Methods 2022年第1期6卷 12-25页

作者： X.Q.Li X.y.Wen Z.H.An C.Cai Z.Chang G.Chen C.Chen y.y.Du M.Gao R.Gao K.Gong D.y.Guo J.J.He D.J.Hou y.G.Li C.y.Li G.Li L.Li X.F.Li M.S.Li X.H.Liang X.J.Liu y.Q.Liu F.J.Lu H.Lu b.Meng W.X.Peng F.Shi X.L.Sun H.Wang J.Z.Wang y.S.Wang H.Z.Wang X.Wen S.Xiao S.L.Xiong y.b.xu y.P.xu S.yang J.W.yang Q.b.yi D.L.Zhang Fan Zhang S.N.Zhang C.y.Zhang C.M.Zhang Fei Zhang X.y.Zhao y.Zhao X.Zhou C.S.Zhang J.P.yu L.Chang K.K.Zhang J.Huang y.M.Chen X.b.Han Institute of High Energy Physics CASBeijing 100049China Xiangtan University Xiangtan 411105China beijing Normal University Beijing 110875China beijing Glass Research Institute Beijing 101100China Innovation Academy for Microsatellites of CAS Shanghai 201204China

Introduction The main physical objective of the GECAM satellite is to detect gamma-ray bursts,which is related to gravitational waves of double compact object *** GECAM satellite also detects and investigates various bursts of high-energy celestial *** and methods In this study,we designed,developed and calibrated the payload and launched it into orbit with GECAM *** payload consists of the gamma ray detector(GRD,for detecting 4 keV–4 MeV X/γray),the charged particle detector(CPD,for detecting 150 keV–5 MeV charged particle),and the electronic box(EbOX).The all-sky field coverage is achieved via two 229-degree large-area satellites positioned 180 degrees apart and are on opposite sides of the *** satellite is equipped with 25 GRDs and 8 CPDs;thus,the satellite can identify charged particle bursts in ***-ray detectors adopt lanthanum bromide crystal technology combined with silicon *** is the first time that this technology was used massively in space *** The GECAM satellite can quickly determine the direction of gamma-ray bursts(positioning)via indexing and fitting method,while the transmit variability,energy spectrum and direction of the gamma-ray bursts guide subsequent observations through the beidou-3 RDSS in quasi-real *** will play an important role in the study of high energy celestial bursts.

关键词： GECAM Gamma-ray burst Lanthanum bromide crystal Silicon photomultiplier beidou short message

Quality assurance test and failure analysis of SiPM arrays of GECAM satellites

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Radiation Detection Technology and Methods 2022年第1期6卷 35-42页

作者： D.L.Zhang M.Gao X.L.Sun X.Q.Li Z.H.An X.y.Wen C.Cai Z.Chang G.Chen C.Chen y.y.Du R.Gao K.Gong D.y.Guo J.J.He D.J.Hou y.G.Li C.y.Li G.Li L.Li X.F.Li M.S.Li X.H.Liang X.J.Liu y.Q.Liu F.J.Lu H.Lu b.Meng W.X.Peng F.Shi H.Wang J.Z.Wang y.S.Wang H.Z.Wang X.Wen S.Xiao S.L.Xiong y.b.xu y.P.xu S.yang J.W.yang Fan.Zhang S.N.Zhang C.y.Zhang C.M.Zhang Fei Zhang X.y.Zhao X.Zhou Institute of High Energy Physics CASBeijing 100049People’s Republic of China

background The Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM)satellite developed a SiPM-based gamma-ray detector to monitor the gravitational wave-related GRbs and guide subsequent observations in other wavelengths of *** As all the available SiPM devices belong to commercial grade,quality assurance tests need to be performed in accordance with the aerospace *** In the SiPM application of GECAM,quality assurance experiments were *** mechanism of the failure of SiPM devices was analyzed during the development *** based on the quality assurance test results,the fnal pass rate of SiPM array was 95%.based on the failure analysis,it was found that a piece of SiPM had a leakage channel after longtime operation due to device *** According to the accumulated experience,in the reliability test of SiPM,it is necessary to pay special attention to test the impedance of each pin of SiPM to ground and confrm that the power switch state of SiPM is controllable.

关键词： Gravitational waves Gamma-ray detectors Silicon photomultipliers Quality assurance test Failure analysis

Inflammatory Factor IL1αInduces Aberrant Astrocyte Proliferation in Spinal Cord Injury Through the Grin2c/Ca^(2+)/CaMK2b Pathway

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Neuroscience bulletin 2024年第4期40卷 421-438页

作者： yu Xia Lu Ding Changlin Zhang Qi xu Ming Shi Tianshun Gao Feng-Quan Zhou David y.b.Deng Scientific Research Center The Seventh Affiliated Hospital of Sun Yat-sen UniversityShenzhen518107China Department of Gynecology The Seventh Affiliated Hospital of Sun Yat-sen UniversityShenzhen518107China Pelvic Floor Disorders Center The Seventh Affiliated Hospital of Sun Yat-sen UniversityShenzhen518107China big Data Center The Seventh Affiliated Hospital of Sun Yat-sen UniversityShenzhen518107China Sir Run Run Shaw Hospital Zhejiang University School of MedicineHangzhou310016China Orthopaedic and Neurological Repair Center The Seventh Affiliated Hospital of Sun Yat-sen UniversityShenzhen518107China

Spinal cord injury(SCI)is one of the most devastating traumas,and the aberrant proliferation of astrocytes usually causes neurological ***,the mechanism underlying astrocyte over-proliferation after SCI is ***2c(glutamate ionotropic receptor type 2c)plays an essential role in cell *** bioinformatic analysis indicated that Grin2c and Ca^(2+)transport functions were inhibited in astrocytes after *** of Grin2c stimulated astrocyte proliferation by inhibiting the Ca^(2+)/calmodulin-dependent protein kinase 2b(CaMK2b)pathway in *** screening different inflammatory factors,interleukin 1α(IL1α)was further found to inhibit Grin2c/Ca^(2+)/CaMK2b and enhance astrocyte proliferation in an oxidative damage *** of IL1αusing neutralizing antibody resulted in increased Grin2c expression and the inhibition of astrocyte proliferation ***,this study suggests that IL1αpromotes astrocyte proliferation by suppressing the Grin2c/Ca^(2+)/CaMK2b pathway after SCI,revealing a novel pathological mechanism of astrocyte proliferation,and may provide potential targets for SCI repair.

关键词： IL1α Grin2c Astrocyte Spinal cord injury