检索结果-南通市图书馆

Development of a high-speed digital pulse signal acquisition and processing system based on MTCA for liquid scintillator neutron detector on EAST

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2023年第10期34卷 60-72页

作者： Yong-Qiang Zhang Li-Qun Hu Guo-Qiang Zhong hong-rui cao Jin-Long Zhao Li Yang Qiang Li Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031China

In this experimental study, involving deuterium–deuterium fusion neutron emission spectroscopy measurement on the experimental advanced superconducting tokamak(EAST), a liquid scintillator detector(BC501 A) was employed. This decision was based on the detector's superior sensitivity, optimal time-response, and its exceptional n–γ discrimination capability. This detector emits fast pulse signals that are as narrow as 100 ns, with high count rates that can peak at several Mcps. However, conventional nuclear circuits faced challenges in performing pulse height analysis, n–γ pulse shape discrimination, and in recording the entire pulse waveform under such high count rate conditions. To address these challenges, a high-speed digital pulse signal acquisition and processing system was designed. The system was developed around a micro-telecommunications computing architecture. Within this structure, a signal acquisition and processing(SAQP) module communicated through PCI Express links, achieving a bandwidth of up to 1.6 GB/s. To accurately capture the detailed shape of the pulses, four channels of analog-to-digital converters were used, each with a 500-MSPS sampling rate and a 14-bit resolution, ensuring an accuracy that surpassed 11 bits. An n–γ discrimination algorithm, based on the two-gate integral method, was also developed. Implemented within field programmable gate arrays, this algorithm provided a real-time n–γ discrimination spectrum for pulse height analysis. The system underwent rigorous testing in a laboratory setting and during an EAST experiment. The results confirmed that the innovative SAQP system can satisfy the demanding requirements of high-parameter experiments, manage count rates of up to 2 Mcps, execute real-time n–γ discrimination algorithms, and record entire pulse waveforms without any data loss.

关键词： EAST NES High-speed MTCA n–γdiscrimination Entire pulse waveform

Performance of real‑time neutron/gamma discrimination methods

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2023年第1期34卷 102-110页

作者： Shi‑Xing Liu Wei Zhang Zi‑Han Zhang Shuang Lin hong‑rui cao Cheng‑Xin Song Jin‑Long Zhao Guo‑Qiang Zhong School of Electronics Hefei University of TechnologyHefei 230009China China Nuclear Power Engineering Co. LtdBeijing 100840China Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China

Nuclear security usually requires the simultaneous detection of neutrons and gamma *** the development of crystalline materials in recent years,Cs2LiLaBr6(CLLB)dual-readout detectors have attracted extensive attention from researchers,where real-time neutron/gamma pulse discrimination is the critical factor among detector performance *** study investigated the discrimination performance of the charge comparison,amplitude comparison,time comparison,and pulse gradient_(m)ethods and the effects of a Sallen–Key filter on their *** results show that the figure of merit(FOM)of all four methods is improved by proper *** them,the charge comparison method exhibits excellent noise resistance;moreover,it is the most_(s)uitable method of real-time discrimination for CLLB ***,its discrimination performance depends on the parameters t_(s),t_(m),and t_(e).When t_(s)corresponds to the moment at which the pulse is at 10%of its peak value,t_(e)requires a delay of only 640–740 ns compared to t_(s),at which time the potentially optimal FOM of the charge comparison method at 3.1–3.3 MeV is greater than *** FOM obtained using the t_(m)value calculated by a proposed maximized discrimination difference model(MDDM)and the potentially optimal FOM differ by less than 3.9%,indicating that the model can provide good guidance for parameter selection in the charge comparison method.

关键词： Charge comparison Maximized discrimination difference model Pulse filtering Real time n-γdiscrimination

Two central circadian oscillators OsPRR59 and OsPRR95 modulate magnesium homeostasis and carbon fixation in rice

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2022年第10期15卷 1602-1614页

作者： Chun-Qu Chen Xin-Yue Tian Jian Li Shuang Bai Zhuo-Yan Zhang Yuan Li hong-rui cao Zhi-Chang Chen Root Biology Center Fujian Agriculture and Forestry UniversityFuzhou 350002China College of Biological and Environmental Engineering Binzhou UniversityBinzhou 256603China

Photosynthesis,which provides oxygen and energy for all living organisms,is circadian ***-associated metabolism must tightly coordinate with the circadian clock to maximize the efficiency of the light-energy capture and carbon ***,the molecular basis for the interplay of photosynthesis and the circadian clock is not fully understood,particularly in crop ***,we report two central oscillator genes of circadian clock,OsPRR95 and OsPRR59 in rice,which function as transcriptional repressors to negatively regulate the rhythmic expression of OsMGT3 encoding a chloroplast-localized Mg2+***3-dependent rhythmic Mg fluctuations modulate carbon fixation and consequent sugar output in rice ***,sugar triggers the increase of superoxide,which may act as a feedback signal to positively regulate the expression of OsPRR95 and *** together,our results reveal a negative-feedback loop that strengthens the crosstalk between photosynthetic carbon fixation and the circadian clock,which may improve plan adaptation and performance in fluctuating environments.

关键词： OsPRR OsMGT3 photosynthesis magnesium rice

Development of a wide-range and fast-response digitizing pulse signal acquisition and processing system for neutron flux monitoring on EAST

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2022年第3期33卷 126-136页

作者： Li Yang hong-rui cao Jin-Long Zhao Zi-Han Zhang Qiang Li Guo-Bin Wu Yong-Qiang Zhang Guo-Qiang Zhong Li-Qun Hu Zi-Jun Zhang Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Hefei University of Technology Hefei 230009China

The neutron count rate fluctuation reaches six orders of magnitude between the ohmic plasma scenario and high power of auxiliary heating on an experimental advanced superconducting tokamak(EAST).The measurement result of neutron flux monitoring(NFM)is a significant feedback parameter related to the acquisition of radiation protection-related information and rapid fluctuations in neutron emission induced by plasma magnetohydrodynamic ***,a wide range and high time resolution are required for the NFM system on *** satisfy these requirements,a digital pulse signal acquisition and processing system with a wide dynamic range and fast response time was *** present study was conducted using a field-programmable gate array(FPGA)and peripheral component interconnect extension for instrument express(PXIe)*** digital dual measurement modes,which are composed of the pulse-counting mode and AC coupled square integral's Campbelling mode,were designed to expand the measurement range of the signal acquisition and processing *** time resolution of the signal acquisition and processing system was improved from 10 to 1 ms owing to utilizing highspeed analog-to-digital converters(ADCs),a high-speed PXIe communication with a direct memory access(DMA)mode,and online data preprocessing technology of *** signal acquisition and processing system was tested experimentally in the EAST radiation *** test results showed that the time resolution of NFM was improved to 1 ms,and the dynamic range of the neutron counts rate was expanded to more than 10^(6) counts per *** Campbelling mode was calibrated using a multipoint average linear fitting method;subsequently,the fitting coefficient reached ***,the newly developed pulse signal acquisition and processing system ensures that the NFM system meets the requirements of high-parameter experiments conducted on EAST more effectively.

关键词： EAST Neutron flux monitoring High time resolution Wide range Pulse signal acquisition and processing system

Design of an energetic particle radiation diagnostic spectroscopy system based on national core chips and Qt on Linux in EAST

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2021年第7期32卷 11-21页

作者： Ying-Ying Zheng Zi-Han Zhang Qiang Li hong-rui cao Yong-Qiang Zhang Jin-Long Zhao Qi-Ping Yuan Bing-Jia Xiao Ling-Ling Yan Jian-Qiu Zhu Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Hefei University of Technology Hefei 230009China

Energetic particle radiation diagnoses mainly detect the particles(such as neutrons,gamma rays,hard X-rays,and escaping electrons)that are radiated in the discharge process of the experimental advanced superconducting tokamak device to characterize the operating state of the plasma in real *** upgrading of these diagnoses requires new instruments based on national(here,“national”means developed and produced by a Chinese company)core chips and open-source software with advanced digitization,a high sampling rate,and a high time *** new spectroscopy system designed in this study adopts the national field-programmable gate array(FPGA)and an analog-to-digital converter as the core chip,and it is developed using Qt on *** communication between the FPGA and embedded controller occurs via a high-speed peripheral component interconnect eXtension for instrument express protocol with a direct memory access *** this basis,the time resolution of the system is improved from 2 to 1 ms,the maximum channel address is increased to 4096,and the sampling rate is increased from 10 to 80 *** experiments of the spectroscopy system with 152Eu and 137Cs sources demonstrate that the best energy resolution is 0.27%and the measurement error is less than±0.5 keV.

关键词： Spectroscopy system National chip Qt Energetic particle radiation Experimental advanced superconducting tokamak

Mitophagy in acute central nervous system injuries:regulatory mechanisms and therapeutic potentials

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第9期20卷 2437-2453页

作者： Siyi Xu Junqiu Jia rui Mao Xiang cao Yun Xu Department of Neurology Nanjing Drum Tower HospitalClinical College of Jiangsu UniversityNanjingJiangsu ProvinceChina Department of Neurology Nanjing Drum Tower HospitalChinese Academy of Medical Science&Peking Union Medical CollegeNanjingJiangsu ProvinceChina Department of Neurology Nanjing Drum Tower HospitalAffiliated Hospital of Medical SchoolNanjing UniversityNanjingJiangsu ProvinceChina State Key Laboratory of Pharmaceutical Biotechnology and Institute of Translational Medicine for Brain Critical Diseases Nanjing UniversityNanjingJiangsu ProvinceChina Jiangsu Key Laboratory for Molecular Medicine Medical School of Nanjing UniversityNanjingJiangsu ProvinceChina Nanjing Neurology Medical Center NanjingJiangsu ProvinceChina

Acute central nervous system injuries,including ischemic stro ke,intracerebral hemorrhage,subarachnoid hemorrhage,traumatic brain injury,and spinal co rd injury,are a major global health *** optimal therapies and improving the long-term neurological functions of patients with acute central nervous system injuries are urgent *** are susceptible to damage after acute central nervous system injury,and this leads to the release of toxic levels of reactive oxygen species,which induce cell ***,a selective form of autophagy,is crucial in eliminating redundant or damaged mitochondria during these *** evidence has highlighted the significant role of mitophagy in acute central nervous system *** this review,we provide a comprehensive overview of the process,classification,and related mechanisms of *** also highlight the recent developments in research into the role of mitophagy in various acute central nervous system injuries and drug therapies that regulate *** the final section of this review,we emphasize the potential for treating these disorders by focusing on mitophagy and suggest future research paths in this area.

关键词： autophagy intracerebral hemorrhage ischemic stroke mitochondria mitochondrial biogenesis mitochondrial quality control mitophagy spinal cord injury subarachnoid hemorrhage traumatic brain injury

700℃热循环冲击对Stellite12钴基合金组织以及折弯强度的影响

在线全文

学校读者我要写书评

暂无评论

材料热处理学报 2017年第2期38卷 61-65页

作者：张海燕车洪艳曹睿刘国辉陈剑虹兰州理工大学有色金属先进加工与再利用省部共建国家重点实验室甘肃兰州730050 安泰科技股份有限公司北京100086

通过对Stellite12钴基合金在700℃下进行热循环冲击试验,结合扫描电镜组织观察、能谱分析、X射线衍射相分析、硬度分析以及弯曲试验,对Stellite12热循环冲击前后的组织、硬度、裂纹出现情况及折弯强度进行研究。研究发现:冲击前后Stelli... 详细信息

通过对Stellite12钴基合金在700℃下进行热循环冲击试验,结合扫描电镜组织观察、能谱分析、X射线衍射相分析、硬度分析以及弯曲试验,对Stellite12热循环冲击前后的组织、硬度、裂纹出现情况及折弯强度进行研究。研究发现:冲击前后Stellite12钴基合金的组织和硬度并未发生较大变化,WC相的边缘出现同成分的絮状扩散物。随着热冲击次数的增多,材料出现微裂纹且微裂纹起源于边缘,并不断扩展,最终形成裂缝。而材料的折弯强度却在75次热循环冲击后大幅降低,同时统计折弯断面上热冲击过程中出现裂纹的区域所占面积比率发现:随着面积比率的增大折弯强度降低,强度大幅降低的临界面积比率为23%。

关键词： Stellite12 热循环冲击裂纹折弯强度

冠高度连接角度基台种植体周围骨质应力分布的有限元分析

在线全文

学校读者我要写书评

暂无评论

口腔颌面修复学杂志 2017年第3期18卷 133-138页

作者：王宏远孙蕊曹庆堂内蒙古医科大学第四附属医院口腔科书记副主任医师内蒙古0140302

目的:通过有限元分析不同临床冠根比连接不同角度基台时种植体周围骨质应力分布情况,为更好的设计种植修复方案提供理论依据。方法:使用CBCT对上颌第一磨牙区进行扫描收集相关数据和图像,利用Mimics10.0建立上颌第一磨牙牙冠的模型。使... 详细信息

目的:通过有限元分析不同临床冠根比连接不同角度基台时种植体周围骨质应力分布情况,为更好的设计种植修复方案提供理论依据。方法:使用CBCT对上颌第一磨牙区进行扫描收集相关数据和图像,利用Mimics10.0建立上颌第一磨牙牙冠的模型。使用geomagic 12.0软件进行精细处理获得上颌第一磨牙牙冠的实体模型。利用Solid Works 12.0软件直接创建并模拟植入不同临床冠根比连接不同倾斜角度的基台。种植体模拟Str aumann软组织水平标准种植体。修改临床冠根比,临床冠根比分别设计为1∶1.5、1∶1、1.5∶1、2∶1分别连接15°、20°、25°、30°4种角度基台共16组模型。使用Ansys14.5 workbench有限元分析插件对模型进行应力分析。结果:垂直载荷下,当基台角度大于15°时,随着冠根比值越来越大,骨皮质与骨松质的Von-Mises应力峰值总体有减小趋势。特殊情况如下,基台角度为10°、25°时,冠高度最好避开10mm;基台角度为10°时,冠高度应减小,冠高度不宜过大。斜向载荷下,当基台的角度相同时,种植体周围骨质的应力峰值随冠高度的增大在增大。冠高度相同时,当基台角度在增加时,种植体周围的骨质应力不在增大。冠根比增加时,种植体周围的骨质应力之间数值相比,P>0.05,没有统计学意义。角度基台只有在10°与30°和15°与30°之间对比时差异有统计学意义。结论:在一定范围内加大临床基台角度与改变冠根比并不会对种植体产生不利的作用力,所以将天然牙的临床冠根比理论简单的应用于种植体周围的骨质和种植体是不准确的。

关键词：种植体临床冠根比角度基台骨质应力分布

Optimizing the key parameter to accelerate the recovery of AMOC under a rapid increase of greenhouse gas forcing

在线全文

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2025年第1期18卷 39-45页

作者： Haolan Ren Fei Zheng Tingwei cao Qiang Wang International Center for Climate and Environment Science(ICCES) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina College of Oceanography Hohai UniversityNanjingChina CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences and Pilot National Laboratory for Marine Science and Technology(Qingdao)QingdaoChina

Atlantic Meridional Overturning Circulation(AMOC)plays a central role in long-term climate variations through its heat and freshwater transports,which can collapse under a rapid increase of greenhouse gas forcing in climate *** studies have suggested that the deviation of model parameters is one of the major factors in inducing inaccurate AMOC *** this work,with a low-resolution earth system model,the authors try to explore whether a reasonable adjustment of the key model parameter can help to re-establish the AMOC after its *** a new optimization strategy,the extra freshwater flux(FWF)parameter is determined to be the dominant one affecting the AMOC’s *** traditional ensemble optimal interpolation(EnOI)data assimilation and new machine learning methods are adopted to optimize the FWF parameter in an abrupt 4×CO_(2) forcing experiment to improve the adaptability of model parameters and accelerate the recovery of *** results show that,under an abrupt 4×CO_(2) forcing in millennial simulations,the AMOC will first collapse and then re-establish by the default FWF parameter ***,during the parameter adjustment process,the saltier and colder sea water over the North Atlantic region are the dominant factors in usefully improving the adaptability of the FWF parameter and accelerating the recovery of AMOC,according to their physical relationship with FWF on the interdecadal timescale.

关键词： Recovery of AMOC 4×CO_(2)forcing Key parameter Parameter estimation Data assimilation Machine learning