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Discrimination of neutron and gamma ray using the ladder gradient method and analysis of filter adaptability

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Nuclear Science and Techniques 2022年第12期33卷 105-115页

作者： Hao-Ran liu ming-Zhe liu Yu-Long Xiao Peng li Zhuo Zuo Yi-Han Zhan State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China The Engineering&Technical College of Chengdu University of Technology Leshan 614000China Southwestern Institute of Physics Chengdu 610225China

This study proposes a ladder gradient method for neutron and gamma-ray *** proposed method exhibited state-of-the-art performance with low time consumption,which incorporates two parts:information extraction and discrimination factor calculation.A quasi-continuous spiking cortical model was proposed to extract information from the radiation pulse signals,thus generating an ignition map corresponding to each pulse *** ignition map can be used to calculate the discrimination factor.A ladder gradient calculation was introduced to obtain a discrimination factor with low computational *** proposed method was compared with five other discrimination methods to evaluate its robustness and ***,the filter adaptability of the pulse-coupled neural network and ladder gradient methods was *** reasons for adapting the conditions with different discrimination methods and filters were *** were conducted in 20 filtering situations with 11 types of filters to determine the most suitable filters for discrimination *** experimental results revealed that the three most adaptive filters of the pulse-coupled neural networks and ladder gradient methods are the wavelet,elliptic,and median filters and the elliptic,moving average,and wavelet filters,respectively.

关键词： n-c Discrimination Pulse-shape discrimination Ladder gradient Pulse-coupled neural network Filtering Filter adaptability

Molecular Genetic Variation in a Clonal Plant Population of Leymus chinensis （Trin.） Tzvel.

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Journal of Integrative Plant Biology 2005年第9期47卷 1055-1064页

作者： Yu-Sheng WANG li-ming ZHAO Hua WANG Jie WANG Da-ming HUANG Rui-Min HONG Xiao-Hua TENG Nakamura MIKI Grassland Research Station College of Animal Science and Technology Northeast Agricultural University Harbin 150030 China The School of Management Tianjin University Tianjin 300071 China School of Economy-Management Tianjin University of Technology Tianjin 300191 China Department of Breast Surgery Cancer Institute Fu-Dan University Medical Center Shanghai 200032 China Department of Biological Sciences and Biotechnology Tsinghua University Beijing 100084 China

Randomly amplified polymorphic DNA （RAPD） analysis was used to investigate the genetic variation among populations, between populations, and within populations, relationships between genetic distance and geographic distance, and the molecular variation and population size. The effects of geographic and genetic distances, as well as of genetic differentiation and population size, on genetic variations of Leymus chinensis （Trin.） Tzvel. are discussed. The present study showed that there was significant RAPD variation between the Baicheng region population and the Daqing region population, with a molecular variance of 6.35% （P 〈 0.04）, and for differentiation among area populations of the Daqing region, with a molecular variance of 8.78% （P 〈 0.002）. A 21.06% RAPD variation among all 16 populations among two regions was found （P 〈 0.001）, as well as 72.59% variation within populations （P 〈 0.001）. Molecular variation within populations was significantly different among 16 populations.

关键词： clonal plant population genetic distance genetic variation geographic distance molecular variation.

Pulmonary and cerebral lipiodol embolism after transcatheter arterial hemoembolization in hepatocellular carcinoma

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World Journal of Gastroenterology 2009年第5期15卷 633-635页

作者： Jian-Jun Wu ming Chao Guang-Qiang Zhang Bin li Fei Dong Department of Radiology Second Affiliated Hospital Zhejiang University School of Medicine 88 Jiefang Road Hangzhou 310009 Zhejiang Province China

Pulmonary and cerebral lipiodol embolism after transcatheter arterial chemoembolization (TACE) of hepatocellular carcinoma is rare. To our knowledge, only 7 cases have been reported in the literature. We present a case of pulmonary and cerebral lipiodol embolism, and analyzed retrospectively the imaging and clinical data of the patient and conclude the most probable mechanism of pulmonary and cerebral lipiodol embolism, which is different from that of the cases reported previously.

关键词： Pulmonary embolism Cerebral embolism lipiodol Transcatheter arterial chemoembolization Hepatocellular carcinoma Complication

Building a sequence map of the pig pan-genome from multiple de novo assemblies and Hi-C data

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Science China(life Sciences) 2020年第5期63卷 750-763页

作者： Xiaomeng Tian Ran li Weiwei Fu Yan li Xihong Wang ming li Duo Du Qianzi Tang Yudong Cai Yiming Long Yue Zhao mingzhou li Yu Jiang Key Laboratory of Animal Genetics Breeding and Reproduction of Shaanxi ProvinceCollege of Animal Science and TechnologyNorthwest A&F UniversityYangling 712100China Institute of Animal Genetics and Breeding College of Animal Science and TechnologySichuan Agricultural UniversityChengdu 611130China

Pigs were domesticated independently in the Near East and China,indicating that a single reference genome from one individual is unable to represent the full spectrum of divergent sequences in pigs ***,12 de novo pig assemblies from Eurasia were compared in this study to identify the missing sequences from the reference *** a result,72.5 Mb of nonredundant sequences(~3% of the genome)were found to be absent from the reference genome(Sscrofa11.1)and were defined as *** the pan-sequences,9.0 Mb were dominant in Chinese pigs,in contrast with their low frequency in European *** sequence dominant in Chinese pigs contained the complete genic region of the tazarotene-induced gene 3(TIG3)gene which is involved in fatty acid *** flanking sequences and Hi-C based methods,27.7% of the sequences could be anchored to the reference *** supplementation of these sequences could contribute to the accurate interpretation of the 3D chromatin structure.A web-based pan-genome database was further provided to serve as a primary resource for exploration of genetic diversity and promote pig breeding and biomedical research.

关键词： pan-genome pig reference genome 3D chromatin structure presence-absence variation

Fluorescent Detection of Trace Water in Methanol Based on an AI（III） Chemical Sensor

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Chinese Journal of Chemistry 2016年第11期34卷 1109-1113页

作者： liang Hao Qi-ming Qiu Wen-jie Wang Leilei Gu Hui li Key Laboratory of Clusters Science of Ministry of Education School of Chemistry Beijing Institute of Technology Beijing 100081 China

A colorimetric and fluorescent sensor for trace water in methanol has been designed and characterized, which is a kind of aluminium-Schiff base coordination complex derived from diaminomaleonitrile. The fluorescence properties of this complex have been studied based on excited state intramolecular proton transfer （ESIPT） and intramolecular charge transfer （ICT） mechanism. The fluorescent emission of AI-L complex can be quenched by 0.1% water and distinguished by naked eyes. The detection limitation is 0.01% recognized by fluorescence spectra.

关键词： detection water content in methanol fluorescent monitoring ESIPT ICT

Sensitivity of the Impact Toughness and Microstructure of 15CrNi3MoV Steel Under Different Quenching Rates

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Acta Metallurgica Sinica(English Letters) 2023年第10期36卷 1735-1748页

作者： Bing Wang Hong-lin Zhang Bin Xu Hai-Yang Jiang ming-Yue Sun Dian-Zhong li Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

The sensitivities of the mechanical properties and microstructure of 15CrNi3MoV alloy steel under different quenching rates were investigated in the present *** subjection to quenching with four different cooling rates(water cooling,forced air cooling,static air cooling and furnace cooling)followed by tempering,the microstructure was characterized by scanning electron microscopy(SEM),electron back-scattered diffraction(EBSD),and transmission electron microscopy(TEM);and the low-temperature(−20°C)impact toughness was *** results showed that the tempered microstructure and mechanical properties had high sensitivity to the quenching *** a decrease in the quenching rate,the low-temperature impact energy of tempered specimens decreased with increasing ***,the fracture morphology changed from completely ductile to *** addition,as the quenching cooling rate decreased,the as-quenched matrix changed from a lathy to a polygonal structure with the presence of carbides and martensite-austenite(M-A)constituents,and the effective grain size *** martensite with dispersed fine carbides was found in the tempered water cooling specimen,and tempered bainite with a polygonal structure containing large carbides and rare incomplete undecomposed M-A constituents was found in the tempered forced air cooling,static air cooling and furnace cooling *** small effective grain size and fine carbides contributed to the good temperature impact toughness of the tempered water cooling specimens.

关键词： Alloy steel Quenching cooling rate Impact toughness Martensite-austenite(M-A)constituents Carbides

The Common Principal Component Analyses of Multi-RCMs

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Atmospheric and Oceanic Science Letters 2013年第1期6卷 14-20页

作者： FENG Jin-ming WANG Yong-li FU Cong-Bin Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences

Based on a 10-year simulation of six Regional Climate Models(RCMs) in phase II of the Regional Climate Model Inter-Comparison Project(RMIP) for Asia,the multivariate statistical method of common principal components(CPCs) is used to analyze and compare the spatiotemporal characteristics of temperature and precipitation simulated by multi-RCMs over China,including the mean climate states and their seasonal transition,the spatial distribution of interannual variability,and the interannual *** is an effective statistical tool for analyzing the results of different *** with traditional statistical methods,CPC analyses provide a more complete statistical picture for observation and simulation *** results of CPC analyses show that the climatological means and the characteristics of seasonal transition over China can be accurately simulated by ***,large biases exist in the interannual variation in certain years or for individual models.

关键词： RMIP for Asia common principal compo- nents spatiotemporal characteristic interannual variation

Two Types of Potential Oscillation During the Reduction of Dichromate on Gold Electrode in H2SO4 Solution

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Chinese Journal of Chemical Physics 2006年第3期19卷 214-218页

作者： Xiao-chun Jiang shu Chen Ze-lin li College of Chemistry and Chemical Engineering Hunan Normal University Changsha 410081 China

Two different types of potential oscillations have been identified for the first time during dichromate reduction on a gold electrode in a solution of dilute sulfuric acid. One occurs before hydrogen evolution due to the formation and dissolution of passivating films of low-valence chromium oxides, and the other generates, accompanying periodic hydrogen evolution, from the coupling of electrochemical reactions with diffusive and convective mass transport. More interestingly, these two types of oscillations correspond to two crossing loops in the cyclic voltammogram （CV）. Such a relation of oscillations with crossed CVs will provide a new way to find electrochemical oscillatory systems systematically and rapidly.

关键词： Potassium dichromate Gold electrode Reduction CV criterion Potential oscillations

Modeling and simulation of muzzle flow field of railgun with metal vapor and arc

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Defence Technology（防务技术） 2020年第4期16卷 802-810页

作者： Yuan Gao Yan-jie Ni Zhao-xin Wang Ying-tao Xu Yong Jin Bao-ming li National Key Laboratory of Transient Physics Nanjing University of Science and TechnologyNanjing 210094JiangsuChina China Academy of Ordnance 100089BeijingChina

During the electromagnetic railgun launching process,there will be a complex flow field with high temperature in the muzzle area because of the high-speed friction,transition and seco ndary *** paper models the muzzle area of railgun when the projectile is far away from the muzzle,and the dynamic simulation of the flow field with secondary arc in the muzzle area is carried out based on the magneto hydrodynamic ***,a multi-component plasma transport model is used to analyze the muzzle arc plasma flow process of the mixed gas of Al vapor and the ***,the pressure boundary conditions are fitted by the dynamic mesh simulation *** current and voltage of the muzzle are obtained through the emission experiment of the railgun experimental *** load the current data into the simulation model and the voltage of experiments and simulations are compared,which proves the accuracy of the *** the plasma temperature and the composition of Al vapor in the muzzle flow process are analyzed in-depth.

关键词： Railgun Flow field Muzzle Plasma Simulation Al vapor