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Study on neutron-gamma discrimination methods based on GMM-KNN and LabVIEW implementation

Nuclear Science and Techniques 2024年第11期35卷 82-97页

作者： Ting-Meng ding Yu-Hang Jiang xuan-Xi Wang Xiao-Fei Jiang Big Data and Information Engineering GuiZhou UniversityGuiyang 550025China

Machine learning algorithms are considered as effective methods for improving the effectiveness of neutron-gamma(n-γ)*** study proposed an intelligent discrimination method that combined a Gaussian mixture model(GMM)with the K-nearest neighbor(KNN)algorithm,referred to as ***,the unlabeled training and test data were categorized into three energy ranges:0–25 keV,25–100 keV,and 100–2100 ***,GMM-KNN achieved small-batch clustering in three energy intervals with only the tail integral Q_(tail) and total integral Q_(total) as the pulse ***,we selected the pulses with a probability greater than 99%from the GMM clustering results to construct the training ***,we improved the KNN algorithm such that GMM-KNN realized the classification and regression algorithms through the LabVIEW *** outputs of GMM-KNN were the category or regression *** proposed GMM-KNN constructed the training set using unlabeled real pulse data and realized n-γdiscrimination of ^(241)Am-Be pulses using the LabVIEW *** experimental results demonstrated the high robustness and flexibility of *** when using only 1/4 of the training set,the execution time of GMM-KNN was only 2021 ms,with a difference of only 0.13%compared with the results obtained on the full training ***,GMM-KNN outperformed the charge comparison method in terms of accuracy,and correctly classified 5.52%of the ambiguous *** addition,the GMM-KNN regressor achieved a higher figure of merit(FOM),with FOM values of 0.877,1.262,and 1.020,corresponding to the three energy ranges,with a 32.08%improvement in 0–25 *** conclusion,the GMM-KNN algorithm demonstrates accurate and readily deployable real-time n-γdiscrimination performance,rendering it suitable for on-site analysis.

关键词： n-discrimination GMM KNN LabVIEW Classification Regression

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High-performance Zn-graphite battery based on LiPF6 single-salt electrolyte with high working voltage and long cycling life

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Journal of Energy Chemistry 2021年第7期30卷 602-609页

作者： Yong Wang Luojiang Zhang Fan Zhang xuan ding Kyungsoo Shin Yongbing Tang Functional Thin Films Research Center Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Advanced Materials Processing&Mold Ministry of EducationZhengzhou UniversityZhengzhou 450002HenanChina Guangdong-Hong Kong-Macao Joint Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina

Zinc-ion batteries(ZIBs) are promising alternative energy storage devices to lithium-ion batteries owing to the merits of large abundance,high theoretical capacity,and environmental ***,critical challenges including low working voltage(below 2 V),low energy density as well as dendrites formation during long cycling caused by aqueous ZIB systems still hinder their practical ***,a high-voltage Zn-graphite battery(ZGB) based on a non-zinc ion single-salt electrolyte(2.5 M LiPF6 in carbonate solvent) is ***,we surprisingly found that Zn^(2+) is dissolved in the LiPF6 single-salt electrolyte during resting and discharging processes,thus enabling reversible Zn plating/stripping mechanism on the Zn foil anode in the ZGB over the voltage window of 1.0-3.1 *** a result,the ZGB achieves long-term cycling performance with a capacity retention of ~100% for over1200 cycles at 3 C and high Coulombic efficiency of ~100% in 1.0-3.1 V with no dendrites ***,the ZGB exhibits a high working voltage of up to 2.2 V,thus contributing to both high energy density(up to 210 Wh kg^(-1)) and high power density(up to 1013 W kg^(-1)),superior than most reported ZIBs.

关键词： Zinc-ion battery Zn anode Graphite cathode LiPF6 single-salt electrolyte High voltage

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A joint absorbing boundary for the multiple-relaxation-time lattice Boltzmann method in seismic acoustic wavefield modeling

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Petroleum Science 2023年第4期20卷 2113-2126页

作者： Chun-Tao Jiang Hui Zhou Mu-ming Xia Han-ming Chen Jin-xuan Tang State Key Laboratory of Petroleum Resources and Prospecting CNPC Key Lab of Geophysical ExplorationChina University of PetroleumBeijing102249China CAS Engineering Laboratory for Deep Resources Equipment and Technology Institute of Geology and Geophysicsand Innovation Academy for Earth ScienceChinese Academy of SciencesBeijing100029China Research Institute of Petroleum Exploration&Development PetroChinaBeijing100083China

Conventional seismic wave forward simulation generally uses mathematical means to solve the macroscopic wave equation,and then obtains the corresponding seismic ***,when the subsurface structure is finely constructed and the continuity of media is poor,this strategy is difficult to meet the requirements of accurate wavefield *** paper uses the multiple-relaxation-time lattice Boltzmann method(MRT-LBM)to conduct the seismic acoustic wavefield simulation and verify its computational *** cope with the problem of severe reflections at the truncated boundaries,we analogize the viscous absorbing boundary and perfectly matched layer(PML)absorbing boundary based on the single-relaxation-time lattice Boltzmann(SRT-LB)equation to the MRT-LB equation,and further,propose a joint absorbing boundary through comparative *** give the specific forms of the modified MRT-LB equation loaded with the joint absorbing boundary in the two-dimensional(2D)and three-dimensional(3D)cases,***,we verify the effects of this absorbing boundary scheme on a 2D homogeneous model,2D modified British Petroleum(BP)gas-cloud model,and 3D homogeneous model,*** results reveal that by comparing with the viscous absorbing boundary and PML absorbing boundary,the joint absorbing boundary has the best absorption performance,although it is a little bit ***,this joint absorbing boundary better solves the problem of truncated boundary reflections of MRT-LBM in simulating seismic acoustic wavefields,which is pivotal to its wide application in the field of exploration seismology.

关键词： Multiple-relaxation-time Lattice Boltzmann method Seismic acoustic wavefield simulation Truncated Boundary reflection Joint absorbing boundary

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A Dynamic XML-NS View Based Approach for the Extensible Integration of Web Data Sources

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Wuhan University Journal of Natural Sciences 2004年第5期9卷 647-651页

作者： WUWei LUZheng-ding LIRui-xuan WANGZhi-gang SchoolofComputerScienceandTechnology.HuazhongUniversityofScienceandTechnology Wuhan430071Hubei.China

We propose a three-step technique to achieve this purpose. First, we utilize a collection of XML namespaces organized into hierarchical structure as a medium for expressing data semantics. Second, we define the format of resource descriptor for the information source discovery scheme so that we can dynamically register and/or deregister the Web data sources on the fly. Third, we employ an inverted-index mechanism to identify the subset of information sources that are relevant to a particular user query. We describe the design, architecture, and implementation of our approach—IWDS, and illustrate its use through case examples. Key words integration - heterogeneity - Web data source - XML namespace CLC number TP 311.13 Foundation item: Supported by the National Key Technologies R&D Program of China(2002BA103A04)Biography: WU Wei (1975-), male, Ph.D candidate, research direction: information integration, distribute computing

关键词： integration heterogeneity Web data source XML namespace

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Anodic-Cathodic Electrocatalytic Degradation of Phenol with Oxygen Sparged in the Presence of Iron(Ⅱ)

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Chemical Research in Chinese Universities 2002年第3期18卷 262-266页

作者： ZHOU ming hua WU Zu cheng xuan Xiao dong Department of Environmental Engineering Zhejiang UniversityHangzhou 310027P.R.China

Under oxygen sparged, the synergetic effects of both anodic cathodic electrocatalysis(ACE) and ferrous ion catalyzed anodic cathodic electrocatalysis(FeACE) on phenol degradation were observed in an undivided cell composed of a β PbO 2 anode modified with fluorine resin and a nickel chromium titanium alloy net cathode. Oxygen sparging rate, ferrous concentration, and current significantly affect phenol destruction. The phenol was removed by 10%-13% increasingly under FeACE vs . ACE, and by 12%-15% under ACE vs . anodic electrocatalysis(AE). The phenol destruction was due to the formation of hydroxyl oxidant on the surface of lead oxide at the anode and the reduction of oxygen at the cathode.

关键词： Anodic cathodic electrocatalysis Phenol degradation Advanced oxidation process

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On the Role of Neutral Particles on Edge Turbulence in the CT-6B Tokamak

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Chinese Physics Letters 1998年第7期15卷 510-512页

作者： WANG Gui-ding YANG xuan-zong FENG Chun-hua JIANG Di-ming QI Xia-zhi Institute of Physics Chinese Academy of SciencesBeijing 100080

A positive limiter biasing on the CT-6B tokamak resulted in a slight increase of edge density and an obvious drop of electron temperature,which is in the temperature range where the rate coefficients for ionization processes are strongly temperature ***,edge fluctuations are enhanced,suggesting that the presence of neutral particles may play an important role in modifying edge turbulence.

关键词： tokamak turbulence Tokamak

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Exosomes:Promising biomarkers and targets for cancer

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World Journal of Gastrointestinal Oncology 2022年第8期14卷 1594-1596页

作者： Zhen Fang Yi-xuan ding Fei Li Department of General Surgery Xuanwu Hospital of Capital Medical UniversityBeijing 100053China

The review article entitled"Exosomes as potential diagnosis and treatment for liver cancer"recently published in World Journal of Gastrointestinal Oncology 2022;14:334-347 concluded that exosomes can be used as effective biomarkers or therapeutic biotargets in liver *** are a hot spot in the field of tumor diagnosis and treatment *** had also previously published a review on exosomes and *** this letter to the editor,we summarize the clinical application prospects and current challenges of exosomes.

关键词： Exosomes Cancer Biomarkers Diagnosis Therapy

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Hawking Radiation of Dirac Particles in 1+1 Dimensional Nonstatic Black Hole

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Chinese Physics Letters 1996年第8期13卷 633-636页

作者： CHEN Da-ming SHEN You-gen SONG Guo-xuan Shanghai Observatory Chinese Academy of SciencesShanghai 200030

This letter is devoted to the discussion of the Hawking radiation of Dirac particles in 1+1 dimensional *** general nonstatic 1+1 dimensional metric is used to calculate the radiant spectrum and the expression of radiation temperature,which,as an example,verifies the quantum-mechanical instability in black hole due to Hawking radiation.

关键词： Dirac devoted letter

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Transformations of N-arylpropiolamides to indoline-2,3-diones and acids via C≡C triple bond oxidative cleavage and C(sp^2)–H functionalization

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Science China Chemistry 2020年第2期63卷 222-227页

作者： ming-Bo Zhou Yang Li xuan-Hui Ouyang Jin-Heng Li Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China Key Laboratory of Chemical Biology&Traditional Chinese Medicine Research(Ministry of Education) Hunan Normal UniversityChangsha 410081China State Key Laboratory of Applied Organic Chemistry Lanzhou University'Lanzhou 730000China

A new palladium-catalyzed oxidative conversion of N-arylpropiolamides and H2O to various indoline-2,3-diones and acids through the C≡C triple bond cleavage and C(sp2)–H functionalization is described,which is promoted by a cooperative action of catalytic CuBr2,2,2,6,6-tetramethyl-1-piperidinyloxy(TEMPO)and *** method provides a practical tool for transformations of alkynes by means of a C–H functionalization strategy,which enables the formation of one C–C bond and multiple C–O bonds in a single reaction with high substrates compatibility and excellent functional group tolerance.

关键词： alkynes indoline-2,3-diones acids C≡C bond oxidative cleavage C–H functionalization

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Predictability of Ensemble Forecasting Estimated Using the Kullback–Leibler Divergence in the Lorenz Model

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Advances in Atmospheric Sciences 2019年第8期36卷 837-846页

作者： Ruiqiang ding Baojia LIU Bin GU Jianping LI xuan LI State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth Sciences University of Chinese Academy of SciencesBeijing 100049China Institute of Space Weather School of Math and StatisticsNanjing University of Information Science and TechnologyNanjing 210044China College of Physics and Optoelectronic Engineering Nanjing University of Information Science and TechnologyNanjing 210044China College of Global Change and Earth System Sciences Beijing Normal UniversityBeijing 100875China

A new method to quantify the predictability limit of ensemble forecasting is presented using the Kullback–Leibler(KL)divergence(also called the relative entropy), which provides a measure of the difference between the probability distributions of ensemble forecasts and local reference(true) states. The KL divergence is applicable to a non-normal distribution of ensemble forecasts, which is a substantial improvement over the previous method using the ensemble spread. An example from the three-variable Lorenz model illustrates the effectiveness of the KL divergence, which can effectively quantify the predictability limit of ensemble forecasting. On this basis, the KL divergence is used to investigate the dependence of the predictability limit of ensemble forecasting on the initial states and the magnitude of initial errors. The local predictability limit of ensemble forecasting varies considerably with the initial states, as well as with the magnitude of initial errors. Further research is needed to examine the real-world applications of the KL divergence in measuring the predictability of ensemble weather forecasts.

关键词： predictability ensemble forecasting Kullback–Leibler divergence

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