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A NONLOCAL KRONECKER-BASIS-REPRESENTATION METHOD FOR LOW-DOSE CT SINOGRAM RECOVERY

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Journal of Computational Mathematics 2024年第4期42卷 1080-1108页

作者： Jian Lu huaxuan Hu Yuru Zou Zhaosong Lu Xiaoxia liu Keke Zu Lin Li Shenzhen Key Laboratory of Advanced Machine Learning and Applications College of Mathematics and StatisticsShenzhen UniversityShenzhen 518060China National Center for Applied Mathematics Shenzhen(NCAMS) Shenzhen 518055China Department of Industrial and Systems Engineering University of Minnesota Twin CitiesMinneapolisMN55455USA Department of Applied Mathematics The Hong Kong Polytechnic UniversityHong Kong SARChina School of Electronic Engineering Xidian UniversityXi'an 710071China

Low-dose computed tomography(LDCT)contains the mixed noise of Poisson and Gaus-sian,which makes the image reconstruction a challenging *** order to describe the statistical characteristics of the mixed noise,we adopt the sinogram preprocessing as a stan-dard maximum a posteriori(MAP).Based on the fact that the sinogram of LDCT has non-local self-similarity property,it exhibits low-rank *** conventional way of solving the low-rank problem is implemented in matrix forms,and ignores the correlations among similar patch *** avoid this issue,we make use of a nonlocal Kronecker-Basis-Representation(KBR)method to depict the low-rank problem.A new denoising model,which consists of the sinogram preprocessing for data fidelity and the nonlocal KBR term,is developed in this *** proposed denoising model can better illustrate the generative mechanism of the mixed noise and the prior knowledge of the ***-merical results show that the proposed denoising model outperforms the state-of-the-art algorithms in terms of peak-signal-to-noise ratio(PSNR),feature similarity(FSIM),and normalized mean square error(NMSE).

关键词： Low-dose computed tomography Kronecker-basis-representation Low-rank imation.Noise-generating-mechanism

MEIC-global-CO_(2):A new global CO_(2)emission inventory with highly-resolved source category and sub-country information

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Science China Earth Sciences 2024年第2期67卷 450-465页

作者： Ruochong XU Dan TONG Qingyang XIAO Xinying QIN Cuihong CHEN liu YAN Jing CHENG Can CUI Hanwen HU Wenyu liu Xizhe YAN huaxuan WANG Xiaodong liu Guannan GENG Yu LEI Dabo GUAN Kebin HE Qiang ZHANG Department of Earth System Science Ministry of Education Key Laboratory for Earth System ModelingInstitute for Global Change StudiesTsinghua UniversityBeijing100084China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China Chinese Academy of Environmental Planning Beijing100041China Institute for Carbon Neutrality Tsinghua UniversityBeijing100084China

CO_(2)emission inventory provides fundamental data for climate research and emission ***,most global CO_(2)emission inventories were developed with energy statistics from International Energy Agency(IEA)and were available at country level with limited source ***,as the first step toward a high-resolution and dynamic updated global CO_(2)emission database,we developed a data-driven approach to construct seamless and highly-resolved energy consumption data cubes for 208 countries/territories,797 sub-country administrative divisions in 29 countries,42 fuel types,and 52 sectors,with the fusion of activity data from 24 international statistics and 65 regional/local *** CO_(2)emissions from fossil fuel combustion and cement production in 1970–2021 were then estimated with highly-resolved source category(1,484 of total)and sub-country information(797 of total).Specifically,73%of global CO_(2)emissions in 2021 were estimated with sub-country information,providing considerably improved spatial resolution for global CO_(2)emission *** the support of detailed information,the dynamics of global CO_(2)emissions across sectors and fuel types were presented,representing the evolution of global economy and progress of climate *** differences of sectoral contribution were found across sub-country administrative divisions within a given country,revealing the uneven distribution of energy and economic structure among different *** estimates were generally consistent with existing databases at aggregated level for global total or large emitters,while large discrepancies were observed for middle and small *** database,named the Multiresolution Emission Inventory model for Climate and air pollution research(MEIC)is publicly available through http://*** with highly-resolved information and timely update,which provides an independent carbon emission accounting data source for climate rese

关键词： CO_(2)emissions Data-driven approach Highly-resolved source category Sub-country information

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可调频率的热声振荡演示器的研制

低温与超导 2010年第10期38卷 1-3页

作者：陈茂巨永林刘华萱上海交通大学制冷与低温工程研究所上海200240

基于热声理论,介绍了一种相对于传统热声振荡演示器更为简单、有效、直观的热声振荡演示装置,该装置除可调节声波振幅外,还可以调节声波的频率。该装置有助于更好地理解热声效应,了解影响热声振荡的因素,为进一步的深入研究奠定基础。

关键词：热声效应演示调频

一种双阶段的高速高精度LED固晶识别定位方法

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计算机应用与软件 2018年第6期35卷 169-173,209页

作者：李呈怡刘化轩李俊东南大学复杂工程系统测量与控制教育部重点实验室江苏南京210096

针对LED微晶粒(0.1～1 mm)吸取、固胶过程中快速识别与精确定位的需求,提出一种基于AdaBoost级联分类器与模板匹配的双阶段固晶目标(待吸取的晶粒和固胶的杯框)的识别定位算法。算法利用基于Haarlike特征的弱分类器构成的AdaBoost级联... 详细信息

针对LED微晶粒(0.1～1 mm)吸取、固胶过程中快速识别与精确定位的需求,提出一种基于AdaBoost级联分类器与模板匹配的双阶段固晶目标(待吸取的晶粒和固胶的杯框)的识别定位算法。算法利用基于Haarlike特征的弱分类器构成的AdaBoost级联分类器快速识别固晶目标以建立候选目标集从而实现初步定位;采用模板匹配的方式从候选集中筛选出目标并实现精确定位。算法通过第一阶段的初步识别定位大大缩小了第二阶段模板匹配的搜索空间,既减少了计算时耗,又保证了精度。测试实验表明,算法可满足固晶机6～8粒/秒的固晶速度需求,且达亚像素级的定位精度。

关键词： LED固晶 AdaBoost算法模板匹配 Haar-like特征

基于四重氢键的自修复温敏相变凝胶的制备及性能

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精细化工 2023年第8期40卷 1688-1696页

作者：陈小菁丘晓琳范晓月刘华萱江南大学机械工程学院江苏无锡214122 江苏省食品先进制造装备技术重点实验室江苏无锡214122

为提高定型相变材料(SSPCM)的使用寿命,以水和离子液体(IL)为相变材料(PCM),N-异丙基丙烯酰胺(NIPAM)为单体,壳寡糖(COS)为添加剂,引入2-脲基-4[1H]-嘧啶酮(UPy)形成四重氢键二聚体,采用自由基聚合法制备了自修复温敏型相变凝胶(S-EBIL... 详细信息

为提高定型相变材料(SSPCM)的使用寿命,以水和离子液体(IL)为相变材料(PCM),N-异丙基丙烯酰胺(NIPAM)为单体,壳寡糖(COS)为添加剂,引入2-脲基-4[1H]-嘧啶酮(UPy)形成四重氢键二聚体,采用自由基聚合法制备了自修复温敏型相变凝胶(S-EBIL)。通过FTIR、SEM、TEM对相变凝胶的化学结构与微观形貌进行了表征,并测定了相变凝胶的自修复性、溶胀性和热性能。结果表明,相变凝胶具有多孔结构,内部孔径为18~38μm,微凝胶核壳尺寸2~4μm。相变凝胶具有温度敏感性,当温度升高时,相变凝胶黏弹性增大,不仅能维持相变材料的基本形状,而且能防止相变材料泄漏。相变凝胶相变温度为-10~0℃,相变焓值最高为252.9 J/g,导热系数为0.5207 W/(m·K)。自修复温敏相变凝胶(S-EBIL3,IL与H_(2)O质量比为3∶10)修复效率可达95.5%(30 s)。

关键词：自修复凝胶四重氢键定型相变材料离子液体功能材料

Identification of key genes and metabolites involved in meat quality performance in Qinchuan cattle by WGCNA

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Journal of Integrative Agriculture 2024年第11期23卷 3923-3937页

作者： Hengwei Yu Zhimei Yang Jianfang Wang huaxuan Li Xuefeng Li Entang Liang Chugang Mei Linsen Zan College of Animal Science and Technology Northwest A&F University College of Grassland Agriculture Northwest A&F University National Beef Cattle Improvement Center

Understanding the genetic and metabolic elements that impact meat quality is crucial to improving production and meeting consumer demands in the beef *** in meat quality among various muscle areas in beef cattle can impact pricing in the *** progress in genomics,the specific genes and metabolites that affect meat quality characteristics in Qinchuan cattle remain inadequately ***,this study aims to evaluate the meat quality characteristics of four specific muscle locations (tenderloin,striploin,high rib,and ribeye muscles) in Qinchuan bulls,including 10 traits (total protein content (TPC),intramuscular fat (IMF),non-esterified fatty acid (NEFA),meat color (L*,a*,and b*),shear force (SF),cooking loss (CL),pH0,and pH24).This experiment uses transcriptome,metabolome sequencing,and sophisticated analytical methodologies such as weighted gene co-expression network analysis (WGCNA) and protein–protein interaction networks (PPI) to identify the key genes and metabolites associated with specific *** findings highlight three notable genes (NDUFAB1,NDUFA12,and NDUFB7) linked to intramuscular fat (IMF),three key genes (CSRP3,ACAA3,and ACADVL) correlated with non-esterified fatty acids (NEFA),and one crucial gene (CREBBP) influencing meat *** conclusion,this investigation offers a new perspective on the differences in bovine muscle locations and contributes to the molecular understanding of bovine meat *** research endeavors could delve deeper into the identified genes and pathways to enhance beef cattle’s quality and yield.

关键词： meat quality performance WGCNA cattle transcriptome metabolome

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营销3.0时代妈祖体育文化传播探究

莆田学院学报 2016年第6期23卷 5-10页

作者：刘华煊刘青健北京体育大学研究生院北京100084 莆田学院体育学院福建莆田351100

以科特勒教授的营销3.0相关理论为支撑,采用文献资料分析法,对比分析"传播"与"营销"两大概念的联系,并经过论证指出,文化创意产业是文化的载体,做好传统体育文化创意产业的营销将是推动传统体育文化传播的一条新路。在此基础上,根据妈... 详细信息

以科特勒教授的营销3.0相关理论为支撑,采用文献资料分析法,对比分析"传播"与"营销"两大概念的联系,并经过论证指出,文化创意产业是文化的载体,做好传统体育文化创意产业的营销将是推动传统体育文化传播的一条新路。在此基础上,根据妈祖体育文化传播与文化产业发展现状,从定位、品牌、差异化三个方面对妈祖体育文化创意产业营销提出建议。

关键词：传统体育文化妈祖文化营销传播创意产业

PandaX: a liquid xenon dark matter experiment at CJPL

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Science China(Physics,Mechanics & Astronomy) 2014年第8期57卷 1476-1494页

作者： CAO XiGuang CHEN Xun CHEN YunHua CUI XiangYi FANG DeQing FU ChangBo GIBONI Karl L. GONG HaoWei GUO GuoDong HE Ming HU Jie HUANG XingTao JI XiangDong JU YongLin LI ShaoLi LIN Qing liu huaxuan liu JiangLai liu Xiang LORENZON Wolfgang MA YuGang MAO YaJun NI KaiXuan PUSHKIN Kirill REN XiangXiang SCHUBNELL Michael SHEN ManBing SHI YuJie STEPHENSON Scott TAN AnDi TARLé Greg WANG HongWei WANG JiMing WANG Meng WANG XuMing WANG Zhou WEI YueHuan WU ShiYong XIAO MengJiao XIAO Xiang XIE PengWei YE Tao YOU YingHui ZEN XiongHui ZHANG Hua ZHANG Tao ZHAO HaiYing ZHAO Li ZHOU XiaoPeng ZHU ZhongHua Shanghai Institute of Applied Physics The Institute of Nuclear and Particle Physics Astronomy and Cosmology (INPAC) and Department of Physics and AstronomyShanghai Jiao Tong University Yalong River Hydropower Development Company Ltd. School of Physics and Key Laboratory of Particle Physics and Particle Irradiation (MOE) Shandong University School of Physics Peking University Department of Physics University of Maryland College Park MD 20742 USA School of Mechanical Engineering Shanghai Jiao Tong University Department of Physics University of Michigan Ann Arbor MI 48109 USA

PandaX is a large liquid-xenon detector experiment usable for direct dark-matter detection and 136Xe double-beta decay *** central vessel was designed to accommodate a staged target volume increase from initially 120 kg(stage I)to 0.5 t(stage II)and eventually to a multi-ton *** experiment is located in the Jinping Deep-Underground Laboratory in Sichuan,*** detector operates in dual-phase mode,allowing detection of both prompt scintillation,and ionization charge through proportional *** this paper a detailed description of the stage I detector design and performance as well as results established during the commissioning phase are presented.

关键词： dark matter liquid xenon detector underground experiment time projection chamber

First dark matter search results from the PandaX-Ⅰ experiment

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Science China(Physics,Mechanics & Astronomy) 2014年第11期57卷 2024-2030页

作者： XIAO MengJiao XIAO Xiang ZHAO Li CAO XiGuang CHEN Xun CHEN YunHua CUI XiangYi FANG DeQing FU ChangBo GIBONI Karl L. GONG HaoWei GUO GuoDong HU Jie HUANG XingTao JI XiangDong JU YongLin LEI SiAo LI ShaoLi LIN Qing liu huaxuan liu JiangLai liu Xiang LORENZON Wolfgang MA YuGang MAO YaJun NI KaiXuan PUSHKIN Kirill REN XiangXiang SCHUBNELL Michael SHEN ManBing STEPHENSON Scott TAN AnDi TARL Greg WANG HongWei WANG JiMin WANG Meng WANG XuMing WANG Zhou WEI YueHuan WU ShiYong XIE PengWei YOU YingHui ZENG XiongHui ZHANG Hua ZHANG Tao ZHU ZhongHua The Institute of Nuclear and Particle Physics Astronomy and Cosmology (INPAC) and Department of Physics and AstronomyShanghai Jiao Tong University Shanghai Institute of Applied Physics Chinese Academy of Sciences Yalong River Hydropower Development Company Ltd. School of Physics and Key Laboratory of Particle Physics and Particle Irradiation (MOE) Shandong University School of Physics Peking University Department of Physics University of MarylandCollege ParkMD20742USA School of Mechanical Engineering Shanghai Jiao Tong University Department of Physics University of MichiganAnn ArborMI48109USA

We report on the first dark-matter(DM)search results from PandaX-I,a low threshold dual-phase xenon experiment operating at the China JinPing Underground *** the 37-kg liquid xenon target with 17.4 live-days of exposure,no DM particle candidate event was *** result sets a stringent limit for low-mass DM particles and disfavors the interpretation of previously-reported positive experimental *** minimum upper limit,3.7×10-44cm2,for the spin-independent isoscalar DM-particle-nucleon scattering cross section is obtained at a DM-particle mass of 49 GeV/c2at 90%confidence level.

关键词： dark matter direct detection xenon