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3D robust anisotropic diffusion filtering algorithm for sparse view neutron computed tomography 3D image reconstruction

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Nuclear Science and Techniques 2024年第3期35卷 13-29页

作者： Yang Liu Teng-Fei Zhu Zhi Luo xiao-ping ouyang School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Xi’an 710024China

The most critical part of a neutron computed tomography(NCT) system is the image processing algorithm,which directly affects the quality and speed of the reconstructed *** types of noise in the system can degrade the quality of the reconstructed ***,to improve the quality of the reconstructed images of NCT systems,efficient image processing algorithms must be *** anisotropic diffusion filtering(ADF) algorithm can not only effectively suppress the noise in the projection data,but also preserve the image edge structure information by reducing the diffusion at the image ***,we propose the application of the ADF algorithm for NCT image *** compare the performance of different algorithms in NCT systems,we reconstructed images using the ordered subset simultaneous algebraic reconstruction technique(OS-SART) algorithm with different regular terms as image processing *** the iterative reconstruction,we selected two image processing algorithms,the Total Variation and split Bregman solved total variation algorithms,for comparison with the performance of the ADF ***,the filtered back-projection algorithm was used for comparison with an iterative *** reconstructing the projection data of the numerical and clock models,we compared and analyzed the effects of each algorithm applied in the NCT *** on the reconstruction results,OS-SART-ADF outperformed the other algorithms in terms of denoising,preserving the edge structure,and suppressing *** example,when the 3D Shepp–Logan was reconstructed at 25 views,the root mean square error of OS-SART-ADF was the smallest among the four iterative algorithms,at only *** universal quality index,mean structural similarity,and correlation coefficient of the reconstructed image were the largest among all algorithms,with values of 0.9877,0.9878,and 0.9887,respectively.

关键词： NCT OS-SART Sparse-view Anisotropic diffusion filtering

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Ultrathin surface coating of Cu enabling long-life Zn metal anodes

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Rare Metals 2024年第5期43卷 2125-2135页

作者： Sang-Sang Liu Ya-Ru Liang Wen-Long Chen Ze-Hua Wang Yi-Long Dai Fu-Gang Qi Zeng-Sheng Ma xiao-ping ouyang School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education Xiangtan UniversityXiangtan 411105China

Aqueous zinc-ion batteries(AZIBs)are regarded as promising energy storage devices due to their low cost,high capacity,and ecological ***,the severe dendritic growth and side reactions hinder their practical applicability ***,an ultrathin Cu coating layer(~200 nm)is decorated on zinc foils via filtered cathodic vacuum arc deposition technology,aiming to achieve high-performance *** Cu layer effectively suppresses chemical corrosion and hydrogen evolution reactions and enables preferential(002)Zn deposition during the stripping/plating ***,the Cu@Zn anode represents an elongated cycle life over 4,000 h at 2 mA·cm^(-2)/2 mAh·cm^(-2).Even in conditions of high current density of 5 and 10 mA·cm^(-2),the Cu@Zn anode shows prolonged cycling stability exceeding 4000 and 2000 h,*** advantages also bring high Coulombic efficiency of 99.87%under 5 mAh·cm^(-2)in Cu@Ti||Zn half-cell over 1500 ***,the Cu@Zn||MnO_(2)full cell demonstrates a superior cyclability with a specific capacity of 203 mAh·g^(-1)after 500 cycles a1 A·g^(-1).

关键词： Zn ion battery Zn metal anode Zn(002)plane Cu coating

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First-order primal-dual algorithm for sparse-view neutron computed tomography-based three-dimensional image reconstruction

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Nuclear Science and Techniques 2023年第8期34卷 35-53页

Neutron computed tomography(NCT)is widely used as a noninvasive measurement technique in nuclear engineering,thermal hydraulics,and cultural *** neutron source intensity of NCT is usually low and the scan time is long,resulting in a projection image containing severe *** reduce the scanning time and increase the image reconstruction quality,an effective reconstruction algorithm must be *** CT image reconstruction,the reconstruction algorithms can be divided into three categories:analytical algorithms,iterative algorithms,and deep *** the analytical algorithm requires complete projection data,it is not suitable for reconstruction in harsh environments,such as strong radia-tion,high temperature,and high *** learning requires large amounts of data and complex models,which cannot be easily deployed,as well as has a high computational complexity and poor ***,this paper proposes the OS-SART-PDTV iterative algorithm,which uses the ordered subset simultaneous algebraic reconstruction technique(OS-SART)algorithm to reconstruct the image and the first-order primal–dual algorithm to solve the total variation(PDTV),for sparse-view NCT three-dimensional *** novel algorithm was compared with other algorithms(FBP,OS-SART-TV,OS-SART-AwTV,and OS-SART-FGPTV)by simulating the experimental data and actual neutron projection *** reconstruction results demonstrate that the proposed algorithm outperforms the FBP,OS-SART-TV,OS-SART-AwTV,and OS-SART-FGPTV algorithms in terms of preserving edge structure,denoising,and suppressing artifacts.

关键词： NCT First-order primal-dual algorithm OS-SART Total variation Sparse-view

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Gaussian shaper for nuclear pulses based on multilevel cascade convolution

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Nuclear Science and Techniques 2022年第12期33卷 116-127页

作者： Min Wang Jian‑Bin Zhou xiao‑ping ouyang Ying‑Jie Ma Xu Hong College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyErxian Bridge No.1 East 3 RoadChenghua DistrictChengdu 610059China Northwest Institute of Nuclear Technology Xi’an 710024China

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 ***,commonly used pulse-shaping algorithms have certain *** example,certain pulse-shaping algorithms have long dead-times in high-counting-rate environments or are difficult to achieve in digital *** 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 *** is difficult to construct a real-time digital Gaussian filter for the complex Gaussian filtering *** 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 *** 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 *** 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 *** results also demonstrated that signal-to-noise ratios and energy resolutions were improved,particularly for pulses with a low *** energy resolution was improved by 0.1–0.2%while improving the counting rate.

关键词： Impulse shaping Multilevel cascade convolution S–K filter Gaussian-like distribution Double exponential signal

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Application of pole-zero cancellation circuit in nuclear signal filtering and shaping algorithm

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Nuclear Science and Techniques 2021年第8期32卷 85-94页

作者： Huai-ping Wang Jian-Bin Zhou xiao-ping ouyang Xian-Guo Tuo Xu Hong Yi Liu Jie Yu You-Xian Jin College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyNo.1 East 3 RoadErxian BridgeChenghua DistrictChengdu 610059China Northwestern Institute of Nuclear Technology Xi’an 710024China Engineering Research Center of Nuclear Technology Application(East China University of Technology) Ministry of EducationNanchang 330013China

In radiation measurement and digital nuclear spectrum systems,traditional nuclear signal processing circuits in nuclear electronics have been gradually replaced by digital algorithm modules with the application of highperformance programmable hardware logic devices(such as FPGA or DSP).Referring to the digital realization method of inverse RC integral circuit systems,the function of the pole-zero cancellation(PZC)circuit was analyzed,a new modified cascade equivalent model of PZC was established,and the time-domain digital PZC(DPZC)recursive algorithm was derived in detail in this *** parameters kIand k_(D)are included in the new algorithm,where kIshould match the exponential decay time constant of the input signal to realize the pole-zero compensation,while the decay time constant of the output signal can be changed with the adjustable parameter k_(D)(which is larger than the decay time constant of the input signal).Based on the new DPZC algorithm module,two trapezoidal(triangular)shaping filters were designed and *** amplitude–frequency characteristics of the output signal of the proposed trapezoidal shaping algorithm and the convolution trapezoidal shaping algorithm were compared,with fixed peaking *** results show that the trapezoidal shaping algorithm based on DPZC can better suppress high-frequency ***,based on the Na I(Tl)scintillator(u75 mm×75 mm)detector and^(137)Cs source,the effect of the k_(D)value on the energy resolution of the DPZC trapezoidal(triangular)shaping algorithm was *** experimental results show that,with an increase in k_(D),the energy resolution of the system improved and reached the maximum when k_(D)was greater than 10,and the optimal energy resolution of the system was 7.72%.

关键词： Pole-zero cancellation C–R inverse system Trapezoidal/triangular shaping Amplitude–frequency characteristics Energy resolution

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Sensitivity investigation of 100-MeV proton irradiation to SiGe HBT single event effect

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Chinese Physics B 2024年第1期33卷 554-562页

作者：冯亚辉郭红霞刘益维欧阳晓平张晋新马武英张凤祁白如雪马晓华郝跃 State Key Laboratory of Wide Bandgap Semiconductor Devices School of MicroelectronicsXidian UniversityXi'an 710071China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China School of Space Science and Technology Xidian UniversityXi'an 710071China State Key Laboratory of Experimental Simulation and Effects of Strong Pulse Radiation Northwest Institute of Nuclear TechnologyXi'an 710024China

The single event effect(SEE) sensitivity of silicon–germanium heterojunction bipolar transistor(Si Ge HBT) irradiated by 100-Me V proton is investigated. The simulation results indicate that the most sensitive position of the Si Ge HBT device is the emitter center, where the protons pass through the larger collector-substrate(CS) junction. Furthermore, in this work the experimental studies are also carried out by using 100-Me V proton. In order to consider the influence of temperature on SEE, both simulation and experiment are conducted at a temperature of 93 K. At a cryogenic temperature, the carrier mobility increases, which leads to higher transient current peaks, but the duration of the current decreases ***, at the same proton flux, there is only one single event transient(SET) that occurs at 93 K. Thus, the radiation hard ability of the device increases at cryogenic temperatures. The simulation results are found to be qualitatively consistent with the experimental results of 100-Me V protons. To further evaluate the tolerance of the device, the influence of proton on Si Ge HBT after gamma-ray(^(60)Coγ) irradiation is investigated. As a result, as the cumulative dose increases, the introduction of traps results in a significant reduction in both the peak value and duration of the transient currents.

关键词： silicon–germanium heterojunction bipolar transistor(Si Ge HBT) 100-Me V proton technology computer-aided design(TCAD) single event effect(SEE)

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Electronic structure and optical properties of the scintillation material wurtzite ZnS(Ag)

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Nuclear Science and Techniques 2017年第3期28卷 35-41页

作者： Dong-Yang Jiang Zheng Zhang Rui-Xue Liang Zhi-Hong Zhang Yang Li Qiang Zhao xiao-ping ouyang Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy School of Nuclear Science and EngineeringNorth China Electric Power University Beijing 102206China School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China Northwest Institute of Nuclear Technology Xi’an 710024China School of Materials Science and Engineering Xiangtan University Xiangtan 411105 China

In order to investigate the effect of Ag doping(ZnS(Ag)) and Zn vacancy(V_(Zn)) on the alpha particle detection performance of wurtzite(WZ) ZnS as a scintillation cell component, the electronic structure and optical properties of ZnS, ZnS(Ag), and V_(Zn)were studied by firstprinciple calculation based on the density functional theory. The results show that the band gaps of ZnS, ZnS(Ag),and V_(Zn)are 2.17, 1.79, and 2.37 eV, respectively. Both ZnS(Ag) and V_(Zn)enhance the absorption and reflection of the low energy photons. A specific energy, about 2.9 eV,leading to decrease of detection efficiency is observed. The results indicate that Ag doping has a complex effect on the detection performance. It is beneficial to produce more visible light photons than pure WZ ZnS when exposed to the same amount of radiation, while the increase of the absorption to visible light photons weakens the detection performance. Zn vacancy has negative effect on the detection performance. If we want to improve the detection performance of WZ ZnS, Ag doping will be a good way,but we should reduce the absorption to visible light photons and control the number of Zn vacancy rigorously.

关键词： Wurtzite ZnS Electronic structure Optical properties First-principle

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Coating highly lithiophilic Zn on Cu foil for high-performance lithium metal batteries

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Rare Metals 2022年第4期41卷 1255-1264页

作者： Yun-Xiong Song Wei-Yi Lu Yue-Jiao Chen Hao Yang Chen Wu Wei-Feng Wei Li-Bao Chen xiao-ping ouyang State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China State Key Laboratory for Powder Metallurgy Central South UniversityChangsha 410083China

Lithium metal batteries(LMBs) are ideal candidates for next-generation high energy density energy storage ***,uncontrollable growth of Li dendrites due to uneven Li plating has restricted the practical application of the Li metal ***,we develop a highly lithiophilic Zn coating on commercial Cu foil as a substrate for Li metal anode to settle above *** find that the lithiophilic nature of Zn can facilitate homogeneous nucleation and deposition of Li on Cu current collector *** addition,the uniform Zn coating can not only decrease the nucleation overpotential but also regulate the electric field *** from the coated Zn layer,the designed anode for half-cell and full-cell tests shows better electrochemical performances compared with the untreated Cu *** work provides a simple and effective way to enable a promising dendrite-free lithium metal anode for large-scale industrial applications.

关键词： Lithiophilic Cu collector surface Coated Zn layer Better electrochemical performances Lithium metal anode

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基于流构全耦合模型的柱塞泵斜盘振动和压力脉动的研究（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2016年第3期17卷 202-214页

作者： xiao-ping ouyang Xu FANG Hua-yong YANG The State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University

目的:航空柱塞泵是飞机液压系统的核心元件,具有高压高转速的特点,其压力脉动是飞机液压系统振动的主要激励源,对飞机液压系统的安全性和可靠性具有重要影响。本文首次全面分析了压力脉动和斜盘振动之间的关系,对降低柱塞泵的压力脉动... 详细信息

目的:航空柱塞泵是飞机液压系统的核心元件,具有高压高转速的特点,其压力脉动是飞机液压系统振动的主要激励源,对飞机液压系统的安全性和可靠性具有重要影响。本文首次全面分析了压力脉动和斜盘振动之间的关系,对降低柱塞泵的压力脉动、提高其可靠性具有重要理论意义。创新点:1.将柱塞泵压力脉动和斜盘振动相结合,综合分析两者相互作用关系;2.综合分析柱塞、斜盘控制阀、斜盘控制柱塞三者间的作用关系,建立全耦合模型。通过仿真分析和实验验证,指出普通模型的局限性以及全耦合模型在研究斜盘振动与压力脉动的真实内在关系的可靠性。方法:1.通过仿真和试验对比,分析全耦合模型和普通模型在压力脉动仿真结果上的差别及原因;2.通过对比分析,确定全耦合模型在斜盘振动仿真方面具有的较高精度;3.通过柱塞泵高压腔流量仿真结果,讨论柱塞泵压力脉动成因以及与斜盘的振动关系;4.通过斜盘力矩仿真分析讨论斜盘振动成因以及与压力脉动的关系;5.通过分析压力脉动、斜盘振动和转速三者间的关系,探讨减轻斜盘振动与减小压力脉动的有效途径。结论:1.全耦合模型的精确度比普通模型高,能较好地预测斜盘振动和压力脉动状态。2.斜盘振动的基频部分主要取决于压力脉动的动态特性,同时还受控制阀机构(FSI-3)和变量柱塞机构(FSI-2)的动态特性影响。压力脉动主要由柱塞泵的柱塞运动关系(FSI-1)决定,不受斜盘高频振动影响。

关键词：振动脉动斜盘航空柱塞泵流构耦合

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Comparative investigation of microjetting generated from monocrystalline tin surface and polycrystalline tin surface under plane impact loading

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Chinese Physics B 2021年第10期30卷 410-417页

作者： Shao-Wei Sun Guan-Qing Tang Ya-Fei Huang Liang-Zhi Cao xiao-ping ouyang School of Energy and Power Engineering Xi’an Jiaotong UniversityXi’an 710049China College of Materials Science and Engineering Hunan UniversityChangsha 410082China Institute of Fluid Physics China Academy of Engineering PhysicsMianyang 621999China

With considering the scattering effect of grain boundary and the grain orientation,the molecular dynamics is used for the first time to comparatively investigate microjetting generated by monocrystalline tin surface and polycrystalline tin surface under plane impact loading in this *** research results show that when the impact velocity is low,the scattering effect of grain boundary and different grain orientations in a polycrystalline tin will cause the sample to melt inhomogeneously,leading the shock wave front to attenuate,meanwhile,the inhomogeneous melting can result in jet *** with monocrystalline tin,the jet head velocity,jet velocity coefficient,and jet mass coefficient of polycrystalline tin at low impact velocity are all ***,as the impact velocity increases,this influence decreases and the microjetting results of polycrystalline tin and monocrystalline tin tend to be consistent with each other.

关键词： molecular dynamics shock wave microjetting monocrystalline tin polycrystalline tin

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