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Study of recursive model for pole-zero cancellation circuit

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nuclear Science and Techniques 2014年第1期25卷 38-42页

作者：周建斌洪旭王仁波周伟胡云川万新峰杜鑫 College of nuclear technology and Automation engineering Chengdu University of Technology engineering research center of nuclear technology application Ministry of EducationEast China institute of Technology engineering research center of nuclear technology application Ministry of EducationEast China institute of Technologya

The output of charge sensitive amplifier(CSA) is a negative exponential signal with long decay time which will result in undershoot after C-R ***-zero cancellation(PZC) circuit is often applied to eliminate undershoot in many radiation ***,it is difficult to use a zero created by PZC circuit to cancel a pole in CSA output signal accurately because of the influences of electronic components inherent error and environmental factors.A novel recursive model for PZC circuit is presented based on Kirchhoff's Current Law(KCL) in this *** model is established by numerical differentiation algorithm between the input and the output *** simulation experiments for a negative exponential signal are carried out using Visual Basic for application(VBA) program and a real x-ray signal is also *** results show that the recursive model can reduce the time constant of input signal and eliminate undershoot.

关键词：零极点对消递归模型消除电路基尔霍夫电流定律数值微分算法电荷灵敏放大器指数信号输出信号

Flexible Graphene Field‑Effect Transistors and Their application in Flexible Biomedical Sensing

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Nano-Micro Letters 2025年第2期17卷 252-313页

作者： Mingyuan Sun Shuai Wang Yanbo Liang Chao Wang Yunhong Zhang Hong Liu Yu Zhang Lin Han Institute of Marine Science and technology Shandong UniversityQingdao 266237ShandongPeople’s Republic of China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100ShandongPeople’s Republic of China School of Integrated Circuits Shandong UniversityJinan 250100ShandongPeople’s Republic of China Shandong engineering research center of Biomarker and Artificial Intelligence application Jinan250100ShandongPeople’s Republic of China

Flexible electronics are transforming our lives by making daily activities more *** to this innovation are field-effect transistors(FETs),valued for their efficient signal processing,nanoscale fabrication,low-power consumption,fast response times,and ***,known for its exceptional mechanical properties,high electron mobility,and biocompatibility,is an ideal material for FET channels and *** combination of graphene and FETs has given rise to flexible graphene field-effect transistors(FGFETs),driving significant advances in flexible electronics and sparked a strong interest in flexible biomedical ***,we first provide a brief overview of the basic structure,operating mechanism,and evaluation parameters of FGFETs,and delve into their material selection and patterning *** ability of FGFETs to sense strains and biomolecular charges opens up diverse application *** specifically analyze the latest strategies for integrating FGFETs into wearable and implantable flexible biomedical sensors,focusing on the key aspects of constructing high-quality flexible biomedical ***,we discuss the current challenges and prospects of FGFETs and their applications in biomedical *** review will provide valuable insights and inspiration for ongoing research to improve the quality of FGFETs and broaden their application prospects in flexible biomedical sensing.

关键词： Flexible Graphene Field-effect transistor Wearable Implantable Biosensor

Two-phase flow component fraction measurement using gamma-ray attenuation technique

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nuclear Science and Techniques 2017年第6期28卷 196-202页

作者： Mohsen Sharifzadeh Hosein Khalafi Hosein Afarideh Ehsanallah Noori Radiation application research School Nuclear Science and Technology Research Institute Department of Energy engineering and Physics AmirKabir University of Technology nuclear Science and technology research Institute Plasma research School Nuclear Science and Technology Research Institute

Multiphase flow meters as the potential alternatives to separation and metering techniques have been in rapid development since 1980 *** its field operation,the instrument should be calibrated in a standard *** spite of the known medium and large scale facilities all over the world,we developed a laboratory scale instrument for component fraction *** has a two-phase flow homogenizer loop with the clamp-on potential of the meters to provide a regime independent *** is capable of delivering a complete homogenization by γ-ray *** an error of±5%in component fraction measurements,this instrument is appropriate for testing and calibrating other meters.

关键词： Component fraction measurement Homogenization MATLAB-Based algorithm Pencilbeam collimation Gamma-ray attenuation

Cross-section measurement of(n,2n) reactions for Nd isotopes induced by 14 MeV neutrons

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nuclear Science and Techniques 2019年第1期30卷 67-72页

作者： Qiang Wang Bing-Jun Chen Qian Zhang Si-Min Cai Chang-Lin Lan Kai-Hong Fang School of nuclear Science and technology Lanzhou University engineering research center for Neutron application technology Ministry of Education Lanzhou University

Cross-sections of the(n,2n) reactions for neodymium(Nd) isotopes induced by 14 MeV neutrons were measured in this work by using the activation and relative methods. The measured cross-sections of the ^(150)Nd(n,2n)^(149)Nd,^(148)Nd(n,2n)^(147)Nd, and ^(142)Nd(n,2 n)^(141)Nd reactions were 1854 ± 81, 1789 ± 119, and 1559 ± 98 mb, respectively, at a neutron energy of 14.2 ± 0.2 MeV,and 1485 ± 74, 1726 ± 85, and 1670 ± 119 mb, respectively, at 14.9 ± 0.2 MeV. The results were compared with the experimental values from the reported literature, with the evaluated data from the ENDF/B-VII.1, CENDL-3.1, and JENDL-4.0 libraries, and with the curves calculated by the Talys-1.8 code.

关键词： Cross-section Neodymium (n,2n)reaction Activation method 14 MeV neutron

Optimal choice of trapezoidal shaping parameters in digital nuclear spectrometer system

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nuclear Science and Techniques 2013年第6期24卷 109-114页

作者： ZHANG Huaiqiang GE Liangquan TANG Bin LIU Tingli engineering research center of nuclear technology application(East China Institute of technology) Ministry of Education School of nuclear engineering and Geophysics East China Institute of Technology School of Information Science and technology Chengdu University of Technology

Trapezoidal shaping method is widely applied to pulse amplitude extraction in digital nuclear spectrometer system,the optimal selection of the shaping parameters can improve the energy resolution and pulse counting *** the view of noise characteristics,ballistic deficit compensation characteristics and pulse pile-up characteristics,in this paper the optimal selection of the trapezoidal shaping parameters is studied *** to the theoretical analysis and experimental verification,the optimal choice of trapezoidal shaping parameters is similar to the triangle,the rise time is longer and the flat-top width is shorter.

关键词：成形参数优化选择梯形系统谱仪高能量分辨率成形方法噪声特性

Adsorption behaviour of Eu(Ⅲ) on natural bamboo fibres: effects of pH, humic acid, contact time, and temperature

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nuclear Science and Techniques 2020年第1期31卷 32-41页

作者： Tao Yu Jun Yang Ze-Yang Wang engineering research center of nuclear technology application(East China University of technology) Ministry of EducationNanchang 330013China School of nuclear Science and engineering East China University of TechnologyNanchang 330013China

To study the adsorption properties of organic functional groups in plant fibres and identify a highly efficient and affordable adsorbent for radioactive wastewater treatment,natural bamboo fibre(NBF)samples were prepared,and the adsorption properties of Eu(Ⅲ)on NBFs were studied under given experimental *** effects of the pH,solid-to-liquid ratio,background ions,humic acid,contact time,and temperature on the adsorption behaviour of Eu(Ⅲ)on NBFs were *** was greatly influenced by pH,and the adsorption curves presented two inflection points at pH≈7 and pH≈***,while the ionic strength presented a negative effect at pH*** adsorption on NBFs,the–OH,C–H,O–H,C–O,and C=O were the main adsorption *** occurring on the NBF surface caused the adsorption process to become increasingly difficult at pH>*** maximum adsorption capacity of NBFs was 147.6 mg/g at 308 K,and the adsorption could be described using the pseudo-second-order kinetic *** adsorption of Eu(Ⅲ)on NBFs was a spontaneous and endothermic process according to the thermodynamic parameters of the process,and the adsorption thermodynamics could be well described using the Freundlich adsorption ***,NBFs were determined to be an efficient,inexpensive,and easily disposable sewage treatment material.

关键词： Adsorption Eu(III) Natural bamboo fibre Organic functional group

Sulfolane‑Based Flame‑Retardant Electrolyte for High‑Voltage Sodium‑Ion Batteries

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Nano-Micro Letters 2025年第2期17卷 498-516页

作者： Xuanlong He Jie Peng Qingyun Lin Meng Li Weibin Chen Pei Liu Tao Huang Zhencheng Huang Yuying Liu Jiaojiao Deng Shenghua Ye Xuming Yang Xiangzhong Ren Xiaoping Ouyang Jianhong Liu Biwei Xiao Jiangtao Hu Qianling Zhang Graphene Composite research center College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China center of Electron Microscopy State Key Laboratory of Silicon and Advanced Semiconductor MaterialsSchool of Materials Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China GRINM(Guangdong)research Institute for Advanced Materials and technology FoshanGuangdong 528051People’s Republic of China College of Energy engineering Zhejiang UniversityHangzhouZhejiang 310027People’s Republic of China School of Materials Science and engineering Xiangtan UniversityXiangtan 411105People’s Republic of China Shenzhen Eigen-Equation Graphene technology Co.Ltd Shenzhen 518000People’s Republic of China

Sodium-ion batteries hold great promise as next-generation energy storage ***,the high instability of the electrode/electrolyte interphase during cycling has seriously hindered the development of *** particular,an unstable cathode–electrolyte interphase(CEI)leads to successive electrolyte side reactions,transition metal leaching and rapid capacity decay,which tends to be exacerbated under high-voltage ***,constructing dense and stable CEIs are crucial for high-performance *** work reports localized high-concentration electrolyte by incorporating a highly oxidation-resistant sulfolane solvent with non-solvent diluent 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether,which exhibited excellent oxidative stability and was able to form thin,dense and homogeneous *** excellent CEI enabled the O3-type layered oxide cathode NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2)(NaNMF)to achieve stable cycling,with a capacity retention of 79.48%after 300 cycles at 1 C and 81.15%after 400 cycles at 2 C with a high charging voltage of 4.2 *** addition,its nonflammable nature enhances the safety of *** work provides a viable pathway for the application of sulfolane-based electrolytes on SIBs and the design of next-generation high-voltage electrolytes.

关键词： Sodium-ion batteries Sulfolane-based electrolyte High voltage Layered oxide cathode Flame retardant

Information retrieval methods for high resolution γ-ray spectra

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nuclear Science and Techniques 2012年第6期23卷 332-336页

作者： WU Hexi ZHANG Huaiqiang LIU Qingcheng YANG Bo WEI Qianglin YUAN Xinyu engineering research center of nuclear technology application(East China Institute of technology Fuzhou) Ministry of Education School of nuclear engineering and Geophysics East China Institute of Technology

A program based on MATLAB 7.0 platform was developed to locate characteristic peak position and calculate net area of characteristic *** formula for the calculation of relative standard deviation of net peak area by Sterlinski’s method was found excellent in searching single peaks and resolving overlapping peaks in high resolution gamma-ray *** function fitting method using Levenberg-Marquardt algorithm was applied to calculate net area of peaks.A standard test spectrum supplied by the IAEA in 1995 was analyzed by the program and another two widely used commercial *** analysis results show the program was superior to the latter two in searching single peaks and resolving overlapping *** optimized fitting indexes are found between 0.962 and 0.996,which shows that the program adopted is feasible and accurate for extracting the net peak area in high resolution gamma-ray spectra.

关键词： γ射线谱 Levenberg-Marquardt算法光谱分辨率检索方法相对标准偏差国际原子能机构信息 MATLAB

The High Quantum Efficiency of Exponential-Doping AlGaAs/GaAs Photocathodes Grown by Metalorganic Chemical Vapor Deposition

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Chinese Physics Letters 2013年第4期30卷 88-91页

作者： ZHANG Yi-Jun ZHAO Jing ZOU Ji-Jun NIU Jun CHEN Xin-Long CHANG Ben-Kang Institute of Electronic engineering and Optoelectronic technology Nanjing University of Science and TechnologyNanjing 210094 engineering research center of nuclear technology application(Ministry of Education East China Institute of TechnologyNanchang 330013

An exponential-doping structure is successfully applied to the preparation of AlGaAs/GaAs photocathodes through the metalorganic chemical vapor deposition(MOCVD)*** experimental results show that the quantum efficiency in the entire waveband region for the exponential-doping photocathodes grown by MOCVD is remarkably enhanced as compared to those grown by molecular beam *** a result of the improved built-in electric fields and cathode performance parameters,the photoemission characteristics for the MOCVD-grown transmission-mode and reflection-mode AlGaAs/GaAs photocathodes are different over the wavelength region of interest.

关键词： AlGaAs/GaAs MOCVD mode