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Centrifuge modeling study on near-ground explosions and the coupling of ground shock energy in sandy foundation 认领 引用
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作者 Longhua Guan Zheng Pang +3 位作者 Qiang Lu Yang Ding Yubing Wang Yunmin Chen 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第7期93-109,共17页
Blast effects and energy transfer in near-ground explosions differ significantly from underground scenarios,particularly in terms of ground shock propagation and energy coupling mechanisms across various geological co... Blast effects and energy transfer in near-ground explosions differ significantly from underground scenarios,particularly in terms of ground shock propagation and energy coupling mechanisms across various geological conditions.This study employs centrifuge modeling to simulate near-ground explosions in sandy soil,including surface explosions and airbursts.The focus was on blast-induced cratering,ground shock effects,and energy coupling in sandy foundations.Scaling laws for crater dimensions and ground shock parameters were established and validated based on experimental results.The"modeling of models"series showed good consistency in crater measurements,leading to an empirical formula for estimating crater radius in dry sand.For surface explosions,soil acceleration responses showed single peaks in the central zone(horizontal standoff distance<0.6 m/(kg)1/3)and dual peaks in the near-surface zone(0.79-1.2 m/(kg)1/3)due to combined effects of direct and airburst-induced ground shock.Empirical methods were developed to predict peak acceleration distributions in sandy foundations.Utilizing crater measurements and ground shock propagation laws,a computational approach for evaluating energy transmission in soil foundations was proposed.The study also developed prediction curves for ground shock energy coupling coefficients with scaled blast depth/height,providing a unified model for both underground and near-ground explosions in sandy foundations.The research findings can enhance the methodologies for simulating blast effects and offer a scientific basis for optimizing weapon effectiveness and protective engineering design. 展开更多
关键词 Centrifuge model tests Near-ground explosions Explosion-induced cratering Ground shock Energy coupling
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Quick evaluation method of rock damage depth in intermediate walls subjected to closely-spaced cavern blasting 认领 引用
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作者 Xudong Jiang Guoyuan Peng +3 位作者 Ke Lu Xingtao Ren Yang Zhao Xiaomu Liao 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第6期330-347,共18页
During the construction of underground caverns,the rock masses of intermediate wall between closelyspaced caverns are easy to be destroyed due to excessive blast-induced damage.Limited to the current measurement techn... During the construction of underground caverns,the rock masses of intermediate wall between closelyspaced caverns are easy to be destroyed due to excessive blast-induced damage.Limited to the current measurement technology,we cannot achieve rapid assessment of the rock damage,making it difficult to realize real-time adjustments to the blast design.Given that the blast vibration is relatively easy to acquire,the study establishes a correlation between the peak particle velocity(PPV)and the damage depth within the intermediate wall.A field measurement of the blast vibration was conducted in a scenario of excavating closely-spaced caverns.A dynamic finite element model was thereafter established and loaded via the equivalent elastic boundary(EEB)method.The model was verified based on the measurement data of blast vibration,together with an appropriate load amplification coefficient.Then,a series of small dimensional models with single-borehole were created to obtain the rock damage extent under various charge quantity in the near-blast area,while a large dimensional EEB model was applied to capture the PPV distribution in the far-field of blasting under the corresponding charge quantities.Finally,the blast-induced damage depth of the intermediate wall and the PPV at a certain blast center distance were correlated by the charge quantity.The relationships between PPV and damage depth at different blast center distance were fitted.The results indicate that deploying vibration monitoring at about 40 m or 50 m from the blasting face can estimate in advance the damage depth of intermediate wall,which can help provide some guidance to the blast of closely-spaced caverns. 展开更多
关键词 Closely-spaced caverns Intermediate wall Blast-induced damage Blast vibration Peak particle velocity
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Enhanced low dose rate sensitivity and pre-irradiation elevated-temperature stress effects in bipolar devices:role of hydrogen in the passivation layer 认领 引用
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作者 Shilong Gou Wuying Ma +3 位作者 Zhibin Yao Zujun Wang Jiangkun Sheng Yuanyuan Xue 《Journal of Semiconductors》 EI CAS CSCD 2026年第4期77-85,共9页
Enhanced low dose rate sensitivity(ELDRS)experiments were carried out on four commercial bipolar integrated circuits at dose rates ranging from 0.002 to 50 rad(Si)/s.Additionally,pre-irradiation elevated-temperature s... Enhanced low dose rate sensitivity(ELDRS)experiments were carried out on four commercial bipolar integrated circuits at dose rates ranging from 0.002 to 50 rad(Si)/s.Additionally,pre-irradiation elevated-temperature stress(PETS)experiments were conducted on the same devices at temperatures of 250 and 400℃.The results show that for some devices,the radiation degradation when irradiated at an ultra-low dose rate of 0.002 rad(Si)/s is more than three times greater than that at a common low dose rate of 0.01 rad(Si)/s.Moreover,the maximum enhancement factor of the PETS effects reaches 20.3.It was also discovered that for devices exhibiting PETS effects,the saturation dose rate of ELDRS is less than 0.01 rad(Si)/s.A comprehensive analysis of the composition of the passivation layers indicated that the type and concentration of hydrogen bonds in these layers are the main factors contributing to the experimental outcomes. 展开更多
关键词 bipolar integrated circuits passivation layers enhanced low dose rate sensitivity pre-irradiation elevated-temperature stress
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Assessment of carrier transport properties of perovskite CsPbCl3 single crystal with time‑of‑flight alpha‑particle response 认领 引用
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作者 Qi‑Hao Sun Zhou Wu +6 位作者 Shu‑Quan Wei Yu‑Quan Wang Xu‑Chang He Bao Xiao Nan‑Nan Shen Jian‑Fu Zhang Yi‑Hui He 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第8期137-147,共11页
All-inorganic CsPbCl3perovskite is a promising material for high-performance radiation detection owing to its extraordinary photoelectric properties and chemical stability.The critical challenge in developing wide-... All-inorganic CsPbCl3perovskite is a promising material for high-performance radiation detection owing to its extraordinary photoelectric properties and chemical stability.The critical challenge in developing wide-bandgap CsPbCl3perovskite lies in the quantitative assessment of its charge transport properties,which regulate its performance optimization.Herein,we report the first spectroscopic a particles using CsPbCl3detectors with asymmetric contact.CsPbCl3single crystals(ф15 mm×50 mm)were successfully grown using the Bridgman melt method and subsequently fabricated into Schottky-type Bi/CsPbCl3/Au detectors.Owing to its high electrical resistivity of 1.25×109Ω·cm,the CsPbCl3detector demonstrated a low dark current density(~870 nA/cm2)and stable performance.The CsPbCl3detector was also capable of resolving both the α particle(5.5 MeV)and γ-ray(59.5 keV)peaks from the 241 Am radioactive isotope.Furthermore,the carrier transport properties of CsPbCl3were evaluated quantitatively by the time-of-flight technology using 241 Am αparticle response,revealing the hole and electron mobilities as~11.12 and~12.92 cm2·V-1·s-1,respectively.Meanwhile,the hole and election mobility-lifetime products were obtained as~1.72×10-4and~1.04×10-4cm2·V-1,respectively.The planar CsPbCl3detector achieved an excellent energy resolution of~14.9%at 122 keV underγ-ray exposure,which is the highest energy resolution reported to date for CsPbCl3detectors.This study highlights the considerable potential of inorganic perovskite detectors for radiation detection and provides a practical approach for the future development of perovskite materials. 展开更多
关键词 CsPbCl3perovskite Carrier transport Bridgman method Radiation detection Semiconductor detector
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Preparation and measurement of an37Ar source for liquid xenon detector calibration 认领 引用
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作者 Xu‑Nan Guo Chang Cai +8 位作者 Fei Gao Yang Lei Kai‑Hang Li Chun‑Lei Su Ze‑Peng Wu Xiang Xiao Ling‑Feng Xie Yi‑Fei Zhao Xiao‑Peng Zhou 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第1期202-211,共10页
We present the preparation and measurement of the radioactive isotope37Ar,which was produced using thermal neutrons from a reactor,as a calibration source for liquid xenon time projection chambers.37Ar is a low-... We present the preparation and measurement of the radioactive isotope37Ar,which was produced using thermal neutrons from a reactor,as a calibration source for liquid xenon time projection chambers.37Ar is a low-energy calibration source with a half-life of 35.01 days,making it suitable for calibration in the low-energy region of liquid xenon dark-matter experiments.Radioactive isotope37Ar was produced by irradiating 36Ar with thermal neutrons.It was subsequently measured in a gaseous xenon time projection chamber(GXe TPC)to validate its radioactivity.Our results demonstrate that37Ar is an effective and viable calibration source that offers precise calibration capabilities in the low-energy domain of xenon-based detectors. 展开更多
关键词 37Ar Gaseous xenon detector Low-energy Calibration source
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Displacement damage effects of low-energy gallium ion irradiation on single-walled carbon nanotube field-effect transistors 认领 引用
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作者 Yu Zhang Huanling Wang +12 位作者 Chenyin Jiao Jiaze Qin Zejuan Zhang Shenghai Pei Suhan Tang Feiliang Chen Ge Tang Juan Xia Chuan Wang Mo Li Hongxia Guo Xiaoping Ouyang Jian Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第7期688-695,共8页
The displacement damage(DD)effects induced by low-energy gallium ions(Ga+)on single-walled carbon nanotube field-effect transistors(SWCNT FETs)are investigated in this study.Exposure to 5 keV Ga+irradiation resu... The displacement damage(DD)effects induced by low-energy gallium ions(Ga+)on single-walled carbon nanotube field-effect transistors(SWCNT FETs)are investigated in this study.Exposure to 5 keV Ga+irradiation resulted in significant changes in the Raman spectra and electrical properties of the devices.The key finding reveals a strong heavy-ion energy dependence of displacement damage(DD):the displacement damage dose(Dd)induced by 5 keV Ga+irradiation is nearly three orders of magnitude higher than that induced by 2225 MeV xenon ions(Xe+).By integrating Raman spectroscopy,electrical characterization,and TRIM simulations,we demonstrate that low-energy heavy ions deposit substantially more energy via non-ionizing energy loss(NIEL)processes within the SWCNT and gate oxide layers compared with high-energy ions.This enhanced energy deposition generates more atomic displacements and vacancies,which significantly degrade both the conductivity of the SWCNT channel and the insulating properties of the gate oxide.These findings provide critical insights into the impact of low-energy ion irradiation on SWCNTs and contribute to a deeper understanding of SWCNT FET behavior in radiation environments. 展开更多
关键词 displacement damage low-energy gallium ions single-walled carbon nanotube field-effect transistors non-ionizing energy loss
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Experimental Investigations on Trigger Characteristics of Pseudospark Switch Based on Surface Flashover Technology 认领 引用 被引量：4
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作者 姚学玲 陈景亮 曾正中 《Plasma Science and Technology》 SCIE EI CAS 2007年第4期496-499,共4页
A trigger device and a triggered pseudospark switch （TPSS） were designed based on surface flashover technology, in order to meet the requirements from present pulse power technology and pulse current test technology... A trigger device and a triggered pseudospark switch （TPSS） were designed based on surface flashover technology, in order to meet the requirements from present pulse power technology and pulse current test technology such as a long lifetime, reliability in a wide voltage range, a short delay time, as well as small delay jitters. The trigger devices were made from different dielectric materials, with their permittivities from tens to thousands. The trigger characteristics of TPSS were investigated. The results indicate that the high-dielectric trigger device shows better performance and higher emitted charge of the electron emission within all adjusted parameters including the gas pressure and applied voltage. For the dielectric material with relative permittivity εr of 3460, when the gas pressure is 7 Pa, the hold-off voltage of TPSS is 28 kV, the minimum trigger switch voltage drops to 128 V, the minimum discharging delay time and delay jitter are less than 35ns and 6ns, respectively, and the reliable operation can be reached within a very large range of charging voltage, between 0.46% and 99% of its self-breakdown voltage. 展开更多
关键词 TPSS （triggered pseudospark switch） trigger characteristics surface fiashover discharge
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Sensitivity study of the SiGe heterojunction bipolar transistor single event effect based on pulsed laser and technology computer-aided design simulation 认领 引用
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作者 冯亚辉 郭红霞 +6 位作者 潘霄宇 张晋新 钟向丽 张鸿 琚安安 刘晔 欧阳晓平 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第6期420-428,共9页
The single event effect of a silicon–germanium heterojunction bipolar transistor(SiGe HBT) was thoroughly investigated. By considering the worst bias condition, the sensitive area of the proposed device was scanned w... The single event effect of a silicon–germanium heterojunction bipolar transistor(SiGe HBT) was thoroughly investigated. By considering the worst bias condition, the sensitive area of the proposed device was scanned with a pulsed laser.With variation of the collector bias and pulsed laser incident energy, the single event transient of the SiGe HBT was studied.Moreover, the single event transient produced by laser irradiation at a wavelength of 532 nm was more pronounced than at a wavelength of 1064 nm. Finally, the impact of the equivalent linear energy transfer of the 1064 nm pulsed laser on the single event transient was qualitatively examined by performing technology computer-aided design simulations, and a good consistency between the experimental data and the simulated outcomes was attained. 展开更多
关键词 silicon-germanium heterojunction bipolar transistor pulsed laser single event effect equivalent linear energy transfer(LET)value
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Experimental determination of stripping foil thickness on the XiPAF synchrotron 认领 引用
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作者 Xiao-Yu Liu Hong-Juan Yao +4 位作者 Shu-Xin Zheng Ze-Jiang Wang Yang Xiong Pei-Zhi Fang Zhong-Ming Wang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2025年第3期27-37,共11页
Stripping injection overcomes the limitations of Liouville's theorem and is widely used for beam injection and accumulation in high-intensity synchrotrons.The interaction between the stripping foil and beam is cru... Stripping injection overcomes the limitations of Liouville's theorem and is widely used for beam injection and accumulation in high-intensity synchrotrons.The interaction between the stripping foil and beam is crucial in the study of stripping injection,particularly in low-energy stripping injection synchrotrons,such as the XiPAF synchrotron.The foil thickness is the main parameter that affects the properties of the beam after injection.The thin stripping foil is reinforced with collodion during its installation.However,the collodion on the foil surface makes it difficult to determine its equivalent thickness,because the mechanical measurements are not sufficiently reliable or convenient for continuously determining foil thickness.We propose an online stripping foil thickness measurement method based on the ionization energy loss effect,which is suitable for any foil thickness and does not require additional equipment.Experimental studies were conducted using the XiPAF synchrotron.The limitation of this method was examined,and the results were verified by comparing the experimentally obtained beam current accumulation curves with the simulation results.This confirms the accuracy and reliability of the proposed method for measuring the stripping foil thickness. 展开更多
关键词 Stripping injection Foil thickness Synchrotron Injection efficiency Experimental study
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Comprehensive study of pulse shape discrimination in a Ga-doped zinc oxide scintillating detector 认领 引用
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作者 Kuo Zhao Liang Chen +5 位作者 Ning Lv Lei-Dang Zhou Shi-Yi He Jin-Lu Ruan Han Wang Xiao-Ping Ouyang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2025年第3期38-49,共12页
Doping with Ga effectively enhances the crystal quality and optical detection efficiency of zinc oxide(Zn O)single crystals,which has attracted considerable research interest in radiation detection.The application of ... Doping with Ga effectively enhances the crystal quality and optical detection efficiency of zinc oxide(Zn O)single crystals,which has attracted considerable research interest in radiation detection.The application of Zn O:Ga(GZO)in nuclear energy is particularly significant and fascinating at the fundamental level,enabling neutron/gamma discrimination while preserving the response time properties of the single crystal in sub-nanoseconds,maximizing the effective counting rate of the pulsed radiation field.In this study,the single-particle waveform discrimination characteristics of GZO were evaluated for five charged particles(α,β,H+,Li+,and O8+and two prevalent uncharged particles(neutrons and gamma rays).Based on the timecorrelation single-photon counting(TCSPC)method,the luminescence decay time constants of the charged particles in the GZO crystal were determined as follows:1.21 ns for H+,1.50 ns for Li+,1.70 ns for O8+,1.56 ns forαparticles,and 1.09 ns forβparticles.Visible differences in the excitation time spectra curves were observed.Using the conventional time-domain or frequency-domain waveform discrimination techniques,waveform discrimination of 14.9 Me V neutrons and secondary gamma rays generated by the CPNG-6 device based on GZO scintillation was successfully implemented.The neutron signal constituted 77.93%of the total,indicating that GZO exhibited superior neutron/gamma discrimination sensitivity compared with that of a commercial stilbene crystal.Using the neutron/gamma screening outcomes,we reconstructed the voltage pulse height,charge height,and neutron multiplication time spectra of the pulsed neutron radiation field.The reconstructed neutron multiplication time spectrum exhibited a deviation of less than 3%relative to the result obtained using a commercial stilbene scintillator.This is the first report in the open literature on the neutron/gamma discrimination and reconstruction of Zn O pulsed radiation-field information. 展开更多
关键词 Zinc oxide Scintillation crystal Pulse shape discrimination Radiation luminescence Pulsed neutron radiation field
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Experimental and numerical study on attenuation of shock waves in ventilation pipes 认领 引用
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作者 Wenjun Yu Shuxin Deng +5 位作者 Shengyun Chen Bingbing Yu Dongyan Jin Zhangjun Wu Yaguang Sui Huajie Wu 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2025年第4期156-168,共13页
With different structural forms of ventilation pipes have various attenuation effects on incident shock waves while meeting ventilation requirements.The attenuation mechanism and the propagation law of shock waves in ... With different structural forms of ventilation pipes have various attenuation effects on incident shock waves while meeting ventilation requirements.The attenuation mechanism and the propagation law of shock waves in ventilation pipes of different structures are investigated by experiments and numerical simulations.Furthermore,for the same structure,the effects of peak pressure and positive pressure time on the attenuation rate are discussed.It is found that the attenuation rate increases with the incident shock wave pressure,and the shock wave attenuation rate tends to reach its limiting value k for the same structure and reasonably short positive pressure time.Under the same conditions,the attenuation rate is calculated using the pressure of the shock wave as follows:diffusion chamber pipe,branch pipe and selfconsumption pipe;the attenuation rate per unit volume is calculated as follows:self-consumption pipe,branch pipe and diffusion chamber pipe.In addition,an easy method is provided to calculate the attenuation rate of the shock wave in single and multi-stage ventilation pipes.Corresponding parameters are provided for various structures,and the margin of error between the formulae and experimental results is within 10%,which is significant for engineering applications. 展开更多
关键词 Hock waves Ventilation pipes Numerical modelling Explosion mechanics
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The damage of sequential explosions in reinforced concrete:Experimental and numerical investigation 认领 引用 被引量：1
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作者 Libin Wang Zhun Bai +3 位作者 Bingwen Qian Yutao Hu Liangquan Wang Gang Zhou 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2025年第6期284-297,共14页
The development of guidance technology has made it possible for the earth penetration weapons(EPWs)to impact the target repeatedly at a close range. To investigative the damage of single and sequential strike induced ... The development of guidance technology has made it possible for the earth penetration weapons(EPWs)to impact the target repeatedly at a close range. To investigative the damage of single and sequential strike induced by the EPWs, experimental and numerical investigations are carried out in this paper.Firstly, a series of sequential explosion tests are conducted to provide the basic data of the crater size.Then, a numerical model is established to simulate the damage effects of sequential explosions using the meshfree method of Smoothed particle Galerkin. The effectiveness of numerical model is verified by comparison with the experimental results. Finally, based on dimensional analysis, several empirical formulas for describing the crater size are presented, including the conical crater diameter and the conical crater depth of the single explosion, the conical crater area and the joint depth of the secondary explosion. The formula for the single explosion expresses the relationship between the aspect ratio of the charge ranging from 3 to 7, the dimensionless buried depth ranging from 2 to 14 and the crater size. The formula for the secondary explosion expresses the relationship between the relative position of the two explosions and the crater size. All of data can provide reference for the design of protective structures. 展开更多
关键词 Crater Dimensional analysis Reinforced concrete Buried depth Aspect ratio Smoothed particle Galerkin
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A novel strategy for obtaining lead-based piezoelectric ceramics with giant piezoelectricity and high-temperature stability through the construction of“slush-like”polar states 认领 引用 被引量：1
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作者 Yangxi Yan Yun Qiao +5 位作者 Longlong Wang Li Jin Maolin Zhang Zhimin Li Mo Zhao Dongyan Zhang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第18期25-35,共11页
Maintaining high piezoelectric response and piezoelectric temperature stability of lead-based piezoceramics is critical for applications under high-temperature environments.Unfortunately,the piezoelectric response of ... Maintaining high piezoelectric response and piezoelectric temperature stability of lead-based piezoceramics is critical for applications under high-temperature environments.Unfortunately,the piezoelectric response of lead-based piezoceramics shows strong temperature dependence.Herein,an innovative strategy was proposed to solve this problem.The method consisted of constructing“slush-like”polar states by introducing localized heterostructures in the tetragonal phase structure to lower the energy barriers.The presence of the tetragonal phase stabilized the domain structure,providing excellent temperature stability,while the localized heterostructures also flattened the free energy landscape and enhanced the piezo-electric response.The strategy was implemented by using 0.11Pb(In0.5Nb0.5)O3-0.89Pb(Hf0.47Ti0.53)O3(PIN-PHT)piezoceramics doped with heterovalent ion Nb5+to form a“slush-like”polar state with strong in-teractions inside the ceramics.The piezoelectric response and relaxor behavior of the ceramics were then investigated using piezoelectric force microscopy to reveal the mapping relationship between the complex ferroelectric domain structure and both the piezoelectric response and temperature stability.At Nb5+doping amount of 0.8 mol%,the ceramics showed excellent comprehensive performances with d33=764 pC/N,Tc=319.1℃,εr=3253.59,kp=0.67,and tan δ=0.0122.At an external ambient temperature of 300℃,the d33 of PIN-PHT-0.8Nb5+ remained high at 734 pC/N,with piezoelectric performance retention of 96.1%,showing excellent temperature stability.Overall,a new path was proposed for developing Pb-based piezoceramics with both good piezoelectric response and high-temperature stability,promising to broaden the temperature range of high-temperature piezoceramics for various applications. 展开更多
关键词 Gibbs free energy “slush-like”polar states Giant piezoelectric response High-temperature stability
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Single-image super-resolution of gamma-ray imaging system using deep denoiser prior based on plug-and-play framework 认领 引用
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作者 Guo-Guang Li Liang Sheng +6 位作者 Bao-Jun Duan Yang Li Yan Song Zi-Jian Zhu Wei-Peng Yan Dong-Wei Hei Qing-Zi Xing 《Matter and Radiation at Extremes》 SCIE EI CAS CSCD 2025年第2期56-70,共15页
Gamma-ray imaging systems are powerful tools in radiographic diagnosis.However,the recorded images suffer from degradations such as noise,blurring,and downsampling,consequently failing to meet high-precision diagnosti... Gamma-ray imaging systems are powerful tools in radiographic diagnosis.However,the recorded images suffer from degradations such as noise,blurring,and downsampling,consequently failing to meet high-precision diagnostic requirements.In this paper,we propose a novel single-image super-resolution algorithm to enhance the spatial resolution of gamma-ray imaging systems.A mathematical model of the gamma-ray imaging system is established based on maximum a posteriori estimation.Within the plug-and-play framework,the half-quadratic splitting method is employed to decouple the data fidelit term and the regularization term.An image denoiser using convolutional neural networks is adopted as an implicit image prior,referred to as a deep denoiser prior,eliminating the need to explicitly design a regularization term.Furthermore,the impact of the image boundary condition on reconstruction results is considered,and a method for estimating image boundaries is introduced.The results show that the proposed algorithm can effectively addresses boundary artifacts.By increasing the pixel number of the reconstructed images,the proposed algorithm is capable of recovering more details.Notably,in both simulation and real experiments,the proposed algorithm is demonstrated to achieve subpixel resolution,surpassing the Nyquist sampling limit determined by the camera pixel size. 展开更多
关键词 deep denoiser prior enhance spatial resolution maximum posteriori estimationwithin radiographic diagnosishoweverthe maximum posteriori estimation gamma ray imaging plug play framework recorded images
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Impedance control method of the cylindrical virtual cathode reflex triode based on multi-ring cathode 认领 引用
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作者 Mengfan ZHANG Dingguo LAI +1 位作者 Qifu XU Mengtong QIU 《Plasma Science and Technology》 SCIE EI CSCD 2025年第4期88-94,共7页
The cylindrical virtual cathode reflex triode is a new type of pulsed hard X-ray load,which has the advantages of simple structure,high radiation conversion efficiency,and simplicity in seriesparallel operation.This p... The cylindrical virtual cathode reflex triode is a new type of pulsed hard X-ray load,which has the advantages of simple structure,high radiation conversion efficiency,and simplicity in seriesparallel operation.This paper presents a method to reduce the impedance of the triode using a multiring cathode.The average electric field on the ring-cathode emission surface is enhanced due to edge effect,and the beam intensity is greatly increased in proportion to the square of the electric field strength.Multi-ring cathode is used to enlarge the emission area.Therefore,the reflex triode can work at lower impedance and generate a stronger beam under the same anode-cathode gap.In addition,the electric field enhancement of the cathode reduces the cathode emission stabilization time and enhances the operation stability of the triode.The effects of parameters such as ring width and ring gap on the triode impedance are simulated and studied.The cathode emission stabilization time and the X-ray conversion efficiency are compared.The design basis of cathode structure parameters and the impedance control method of the cylindrical virtual cathode reflex triode are given according to the simulations. 展开更多
关键词 pulsed hard X-ray reflex triode high current electron beam bremsstrahlung(Some figures may appear in colour only in the online journal)
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Characterization of the new scintillator Cs2LiYCl6:Ce3+ 认领 引用 被引量：10
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作者 Kui-Nian Li Xian-Peng Zhang +2 位作者 Qiang Gui Peng Jin Geng Tian 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2018年第1期39-44,共6页
The first domestic inorganic scintillator, Cs_2LiYCl_6:Ce3+(CLYC), was grown at Beijing Glass Research Institute using the vertical Bridgman method. In this work, we evaluated the performance of this new CLYC cryst... The first domestic inorganic scintillator, Cs_2LiYCl_6:Ce3+(CLYC), was grown at Beijing Glass Research Institute using the vertical Bridgman method. In this work, we evaluated the performance of this new CLYC crystal in terms of its gamma-ray energy resolution and pulse shape discrimination(PSD) capability between neutrons and gamma rays. The decay times associated with different scintillation mechanisms were obtained by fitting decay functions to the neutron and gamma-ray waveform structures. We found an energy resolution of * 4.5% for 662-ke V gamma rays and efficient neutron/gamma PSD with a figure of merit of * 2.6. Under gamma-ray excitation, there is an ultrafast scintillation mechanism in CLYC with a decay time of approximately 2 ns, whereas there is no evidence of ultrafast decay under thermal neutron excitation. This work contributes to the promotion of domestic development of CLYC. 展开更多
关键词 Cs2LiYCl6:Ce3+ Energy resolution Pulse shape discrimination Decay time Thermal neutrons
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Gaussian shaper for nuclear pulses based on multilevel cascade convolution 认领 引用 被引量：11
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作者 Min Wang Jian‑Bin Zhou +2 位作者 Xiao‑Ping Ouyang Ying‑Jie Ma Xu Hong 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第12期116-127,共12页
For nuclear measurements,it is necessary to obtain accurate information from nuclear pulses,which should be obtained by first shaping the pulses outputted by the detectors.However,commonly used pulse-shaping algorithm... For nuclear measurements,it is necessary to obtain accurate information from nuclear pulses,which should be obtained by first shaping the pulses outputted by the detectors.However,commonly used pulse-shaping algorithms have certain problems.For example,certain pulse-shaping algorithms have long dead-times in high-counting-rate environments or are difficult to achieve in digital systems.Gaussian signals are widely used in analog nuclear instruments owing to their symmetry and completeness.A Gaussian signal is usually implemented by using a multilevel S–K filter in series or in parallel.It is difficult to construct a real-time digital Gaussian filter for the complex Gaussian filtering algorithm.Based on the multilevel cascade convolution,a pulse-shaping algorithm for double exponential signals is proposed in this study,which,in addition to double exponential signals,allows more complex output signal models to be used in the new algorithm.The proposed algorithm can be used in high-counting-rate environments and has been implemented in an FPGA with fewer multipliers than those required in other traditional Gaussian pulse-shaping algorithms.The offline processing results indicated that the average peak base width of the output-shaped pulses obtained using the proposed algorithm was reduced compared with that obtained using the traditional Gaussian pulse-shaping algorithm.Experimental results also demonstrated that signal-to-noise ratios and energy resolutions were improved,particularly for pulses with a low energy.The energy resolution was improved by 0.1–0.2%while improving the counting rate. 展开更多
关键词 Impulse shaping Multilevel cascade convolution S–K filter Gaussian-like distribution Double exponential signal
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Influences of Switching Jitter on the Operational Performances of Linear Transformer Drivers-Based Drivers 认领 引用 被引量：6
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作者 刘鹏 孙凤举 +3 位作者 魏浩 王志国 尹佳辉 邱爱慈 《Plasma Science and Technology》 SCIE EI CAS CSCD 2012年第4期347-352,共6页
A whole circuit model of a linear transformer drivers （LTD） module composed of 60 cavities in series was developed in the software PSPICE to study the influence of switching jitter on the operational performances of... A whole circuit model of a linear transformer drivers （LTD） module composed of 60 cavities in series was developed in the software PSPICE to study the influence of switching jitter on the operational performances of LTDs. In the model, each brick in each cavity is capable of operating with jitter in its switch. Additionally, the manner of triggering cables entering into cavities was considered. The performances of the LTD module operating with three typical cavity-triggering sequences were simulated and the simulation results indicate that switching jitter affects slightly the peak and starting time of the output current pulse. However, the enhancement in switching jitter would significantly lengthen the rise time of the output current pulse. Without considering other factors, a jitter lower than 10 ns may be necessary for the switches in the LTD module to provide output current parameters with an acceptable deviation. 展开更多
关键词 linear transformer drivers （LTDs） circuit model pulsed power transmission line jitter trigger delay
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Tectonic and Environmental Evolutions of the Northern Tibetan Plateau Prior to the Collision of India with Asia 认领 引用 被引量：10
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作者 DAI Shuang ZHANG Mingzhen +4 位作者 PENG Dongxiang WANG Huawei WU Maoxian CHEN Ruiling ZHANG Xiang 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第2期425-443,共19页
Tectonic and environmental patterns and evolution of the present North Tibetan Plateau （NTP） prior to the India collision with Asia is significant to understand the formation of the Tibetan Plateau and its influence... Tectonic and environmental patterns and evolution of the present North Tibetan Plateau （NTP） prior to the India collision with Asia is significant to understand the formation of the Tibetan Plateau and its influence on the environment.In this study,we integrated and analyzed the tectonostratigraphy and the special sedimentary layers whose climatic implications are clear in the NTP.Additionally,we stressed the tectonic and environmental events and their evolutions from the Mesozoic to the Early Cenozoic.Our results show that four tectonic phases,which sequentially took place during the Triassic,Jurassic,Cretaceous and Paleogene,played an important role on the formation of the North Tibet.The climate was basically dry and hot from the Triassic to the Eocene and became dry and cool since the Oligocene in this region.The climatic evolution was characterized by a transition from a wet and hot phase during the Triassic-Middle Jurassic,to a dry and hot phase during the Late Jurassic-Eocene.Both phases encompassed 5 wet and hot periods followed by 5 dry and hot climate events,respectively.In addition,we found that the tectonic deformation and the climatic conditions were spatially and temporally different.In detail,in the regions north of the PaleoTian Shan and Paleo-Qilian Mts.the tectonic deformation and climatic condition were stronger and wetter than in regions south of the Paleo-Tian Shan and Paleo-Qilian Mts.during the Late Triassic-Jurassic.Whereas in the Cretaceous,the tectonic movement was intensive in the west but steady in the east,and climate was dry in the south but wet in the north of NTP.The formation of the tectonic and climatic patterns in NTP were the consequence of either global climate change or regional tectonics,including the Paleo-Asian Ocean closure and the Qiangtang block,Lhasa block and India plate collision subsequently to Asia.Furthermore,the regional tectonic events occurred before any global climate change and drove the climatic change in the NTP. 展开更多
关键词 tectonic-climate background North Tibet Mesozoic Early Cenozoic
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Analysis of displacement damage effects on bipolar transistors irradiated by spallation neutrons 认领 引用 被引量：5
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作者 Yan Liu Wei Chen +5 位作者 Chaohui He Chunlei Su Chenhui Wang Xiaoming Jin Junlin Li Yuanyuan Xue 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第6期372-377,共6页
Displacement damage induced by neutron irradiation in China Spallation Neutron Source(CSNS) is studied on bipolar transistors with lateral PNP, substrate PNP, and vertical NPN configurations, respectively. Comparison ... Displacement damage induced by neutron irradiation in China Spallation Neutron Source(CSNS) is studied on bipolar transistors with lateral PNP, substrate PNP, and vertical NPN configurations, respectively. Comparison of the effects on different type transistors is conducted based on displacement damage factor, and the differences are analyzed through minority carrier lifetime calculation and structure analysis. The influence of CSNS neutrons irradiation on the lateral PNP transistors is analyzed by the gate-controlled method, including the oxide charge accumulation, surface recombine velocity,and minority carrier lifetime. The results indicate that the total ionizing dose in CSNS neutron radiation environment is negligible in this study. The displacement damage factors based on 1-MeV equivalent neutron flux of different transistors are consistent between Xi’an pulse reactor(XAPR) and CSNS. 展开更多
关键词 displacement damage China Spallation Neutron Source(CSNS) reactor neutrons bipolar transistors
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