检索结果-南通市图书馆

融合相似预报方法在陇东南短期强降水预报中的应用

在线全文

学校读者我要写书评

暂无评论

高原气象 2025年第1期44卷 214-223页

作者：黄晓远李旭杜梦莹叶培龙李艳兰州大学大气科学学院甘肃兰州730000 兰州中心气象台甘肃兰州730020

基于逐步过滤相似法和自组织映射(SOM)神经网络方法,提出了一种融合相似预报方法。利用ECMWF模式预报产品、ERA5再分析资料和地面气象台站观测数据,使用该方法对2021-2022年陇东南地区开展了时效为72 h的强降水预报试验,并对预报效果进... 详细信息

基于逐步过滤相似法和自组织映射(SOM)神经网络方法,提出了一种融合相似预报方法。利用ECMWF模式预报产品、ERA5再分析资料和地面气象台站观测数据,使用该方法对2021-2022年陇东南地区开展了时效为72 h的强降水预报试验,并对预报效果进行了检验。结果表明:(1)融合相似预报方法的TS评分处于4.5%~9.1%之间,与ECMWF模式预报结果相比表现出一定的优势。随着预报时效的增长,强降水预报的TS评分呈现减小的趋势,其在08:00(北京时,下同)起报的TS评分相对较高。(2)相比于单独使用逐步过滤相似预报,融合相似预报方法的准确性有所提升,并能在一定程度上降低空报率。其中08:00起报和20:00起报的TS评分提高了1.31%和0.63%,而FAR同时下降了2.39%和1.25%。

关键词：强降水短期预报相似预报逐步过滤相似自组织映射(SOM)

同方期刊数据库

A MULTI-OBJECTIVE ROBUST OPERATION MODEL FOR ELECTRONIC MARKET ENABLED SUPPLY CHAIN WITH UNCERTAIN DEMANDS

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2007年第1期16卷 74-87页

作者： Jiawang XU xiaoyuan huang Nina YAN Management Department Shenyang Institute of Aeronautical Engineering Shenyang 110136 China School of Business Administration Northeastern University Shenyang 110004 China

A multi-objective robust operation model is proposed in this paper for an electronic market enablexi supply chain consisting of multi-supplier and multi-customer with uncertain demands. Suppliers in this supply chain provide many kinds of products to different customers directly or through electronic market. Uncertain demands are described as a scenario set with certain probability;, the supply chain operation model is constructed by using the robust optimization method based on scenario analyses. The operation model we proposed is a multi-objective programming problem satisfying several conflict objectives, such as meeting the demands of all customers, minimizing the system cost, the availabilities of suppliers＇ capacities not below a certain level, and robustness of decision to uncertain demands. The results of numerical examples proved that the solution of the model is most conservative; however, it can ensure the robustness of the operation of the supply chain effectively.

关键词： Operation management robust optimization objective programming electronic market

Spatial pattern recognition for near-surface high temperature increases in mountain areas using MODIS and SRTM DEM

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

Journal of Mountain Science 2024年第6期21卷 2025-2042页

作者： WANG Yanxia YANG Lisha huang xiaoyuan ZHOU Ruliang School of Soil and Water Conservation Southwest Forestry UniversityKunming 650224China School of Economics and Management Southwest Forestry UniversityKunming 650224China

Abrupt near-surface temperature changes in mountainous areas are a special component of the mountain climate *** and accurate measurements of the locations,intensity,and width of the near-surface changes are necessary but highly difficult due to the complicated environmental conditions and instrumental *** paper develops a spatial pattern recognition method to measure the near-surface high temperature increase(NSHTI),one of the lesser-attended ***,raster window measurement was proposed to calculate the temperature lapse rate using MODIS land surface temperature and SRTM DEM *** fully considers the terrain heights of two neighboring cells on opposite or adjacent slopes with a moving window of 3×3 cell ***,a threshold selection was performed to identify the NSHTI cells using a threshold of-0.65℃/100 ***,the NSHTI strips were parameterized through raster vectorization and spatial *** Yunnan,a mountainous province in southwestern China,as the study area,the results indicate that the NSHTI cells concentrate in a strip-like pattern along the mountains and valleys,and the strips are almost parallel to the altitude contours with a slight northward ***,they are located mostly at a 3/5 height of high mountains or within 400 m from the valley floors,where the controlling topographic index is the altitude of the terrain trend surface but not the absolute elevation and the topographic uplift height and cutting ***,the NSHTI intensity varies with the geographic locations and the proportions increase with an exponential trend,and the horizontal width has a mean of about 1000 m and a maximum of over 5000 *** result demonstrates that the proposed method can effectively recognize NSHTI boundaries over mountains,providing support for the modeling of weather and climate systems and the development of mountain resources.

关键词： High temperature increase Mountain areas MODIS Spatial pattern recognition Raster window measurement Threshold selection

Study on the Performance of the GRANDProto300 Particle Detector Array by Simulation

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第1期24卷 173-177页

作者： Fu-Lin Dai Quan-Bu Gou xiaoyuan huang Yi-Qing Guo Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

The Giant Radio Array for Neutrino Detection(GRAND)is a proposed large-scale observatory designed to detect cosmic rays,gamma-rays,and neutrinos with energies exceeding 100 Pe *** GRANDProto300 experiment is proposed as the early stage of the GRAND project,consisting of a hybrid array of radio antennas and scintillator *** latter,as a mature and traditional detector,is used to cross-check the nature of the candidate events selected from radio *** this study,we developed a simulation software called G4GRANDProto300,based on the Geant4 software package,to optimize the spacing of the scintillator detector array and to investigate its effective *** analysis was conducted at various zenith angles under different detector spacings,including 300,500,600,700,and 900 *** results indicate that,for large zenith angles used to search for cosmic-ray in the GRAND project,the optimized effective area is with a detector spacing of 500 *** G4GRANDProto300 software that we developed could be used to further optimize the layout of the particle detector array in future work.

关键词： astroparticle physics instrumentation:detectors (ISM:)cosmic rays

MiR-450b-5p enhances the radiosensitivity of HR^(+) and HER2^(−) breast cancer by targeting CDK6

在线全文

学校读者我要写书评

暂无评论

Oncology and Translational Medicine 2024年第4期10卷 198-203页

作者： Ruxing Wu Hanwang Zhang xiaoyuan huang Liang Zhuang Reproductive Medicine Center Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina Cancer Biology Research Centre Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina Cancer Center Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina

Background:The sensitivity of breast cancer cells to radiation is a key cause of locoregional recurrence after postoperative *** studies have reported that microRNAs(miRNAs)are involved in the radiosensitivity of human breast cancer *** miRNA microarray study showed that miR-450b-5p was overexpressed 13.3-fold in patients with estrogen receptor–positive(ER^(+))and human epidermal growth factor receptor 2–negative(HER2−)breast cancer and no local relapse compared with local relapse ***,its underlying mechanism of action remains ***:The predicted target mRNAs of miR-450b-5p were screened using the TargetScan,miRDB,and miRWalk *** blotting,quantitative polymerase chain reaction,and dual-luciferase reporter assays explored the association between cyclindependent kinase 6(CDK6)and *** cell counting kit-8 assay and flow cytometry detected the proliferation of transfected MCF7 *** formation and xenograft tumors detected the radiosensitivity of the transfected MCF7 ***:Bioinformatics analysis,Western blotting,quantitative polymerase chain reaction,and dual-luciferase reporter assays demonstrated that CDK6 was the target gene of ***,in vitro and in vivo experiments showed that miR-450b-5p inhibited MCF7 cell proliferation and cell cycle progression,increased the sensitizer enhancement ratio,and decreased the volume of xenograft tumors after irradiation by regulating ***:This study demonstrates that miR-450b-5p enhances the radiosensitivity of hormone receptor–positive(HR^(+))and HER2−breast cancer cells and elucidates its ***-450b-5p may be considered a therapeutic target in HR^(+)and HER2−breast cancer treated with radiotherapy.

关键词： Breast cancer Cyclin-dependent kinase 6 miR-450b-5p Radiosensitivity

Correlativity study between expression of DNA double-strand break repair protein and radiosensitivity of tumor cells

在线全文

学校读者我要写书评

暂无评论

Frontiers of Medicine 2009年第1期3卷 26-29页

作者： Liang Zhuang Shiying YU xiaoyuan huang Yang CAO Huihua XIONG Cancer Center Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Cancer Biology Research Center Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

DNA double-strand break(DSB)is generally regarded as the most lethal of all DNA lesions after ***80,DNA-PK catalytic subunit(DNA-PKcs)and ataxia telangiectasia mutated(ATM)proteins are major DSB repair *** this study,survival fraction at 2Gy(SF2)values of eight human tumor cell lines(including four human cervical carcinoma cell lines HeLa,SiHa,C33A,Caski,three human breast carcinoma cell lines MCF-7,MDA-MB-231,MDA-MB-453,and one human lung carcinoma cell line A549)were acquired by clone formation assay,and western blot was applied to detect the expressions of Ku80,DNA-PKcs and ATM *** correlativity of protein expression with SF2 value was analyzed by Pearson linear correlation *** found that the expression of the same protein in different cell lines and the expression of three proteins in the same cell line had a signiﬁcant *** SF2 values were also different in eight tumor cell lines and there was a positive correlativity between the expression of DNA-PKcs and SF2(r=0.723,P=0.043),but Ku80 and ATM expression had no correlation with SF2(P>0.05).Theseﬁndings suggest that the expression level of DNA-PKcs protein can be an indicator for predicting the radiosensitivity of tumor cells.

关键词： Ku80 DNA-PK(cs)-binding protein,human ataxia telangiectasia mutated protein tumor cell lines radiosensitivity

Collapse arrest in the space-fractional Schrodinger equation with an optical lattice

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

Chinese Physics B 2021年第10期30卷 328-333页

作者： Manna Chen Hongcheng Wang Hai Ye xiaoyuan huang Ye Liu Sumei Hu Wei Hu School of Electrical Engineering and Intelligentization Dongguan University of TechnologyDongguan 523808China Department of Physics Guangdong University of Petrochemical TechnologyMaoming 525000China Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices South China Normal UniversityGuangzhou 510006China

The soliton solution and collapse arrest are investigated in the one-dimensional space-fractional Schrodinger equation with Kerr nonlinearity and optical *** approximate analytical soliton solutions are obtained based on the variational approach,which provides reasonable ***-stability analysis shows that all the solitons are linearly *** collapses are found when the Levy index 1<α≤***α=1,the collapse is arrested by the lattice potential when the amplitude of perturbations is small *** is numerically proved that the energy criterion of collapse suppression in the two-dimensional traditional Schrodinger equation still holds in the one-dimensional fractional Schr odinger *** physical mechanism for collapse prohibition is also given.

关键词： soliton solution collapse variational approach nonlinear Schrodinger equation

A density functional theory study on the decomposition of aliphatic hydrocarbons and cycloalkanes during coal pyrolysis in hydrogen plasma

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

Journal of Energy Chemistry 2015年第1期24卷 65-71页

作者： xiaoyuan huang Dangguo Cheng Fengqiu Chen Xiaoli Zhan Key Laboratory of Biomass Chemical Engineering of Ministry of Education Zhejiang University Department of Chemical and Biological Engineering Zhejiang University

To get deep understanding of the reaction mechanism of coal pyrolysis in hydrogen plasma, the decomposition reaction pathways of aliphatic hydrocarbons and cycloalkanes, which are two main components in volatiles from coal, were investigated. Methane and cyclohexane were chosen as the model compounds. Density functional theory was employed, and many reaction pathways were involved. Calculations were carried out in Gaussian 09 at the B3LYP/6-31G（d,p） level of the theory. The results indicate that the main pyrolysis products of methane and cyclohexane in hydrogen plasma are both hydrogen and acetylene, and the participation of active hydrogen atoms makes dehydrogenation reactions more favorable. H2 mainly comes from dehydrogenation process, while many reaction pathways are responsible for acetylene formation. During coal pyrolysis in hydrogen plasma, three main components in volatiles like aliphatic hydrocarbons, cycloalkanes and aromatic hydrocarbons lead to the formation of hydrogen and acetylene, but their contributions to products distribution are different.

关键词： coal pyrolysis thermal plasma density functional theory aliphatic hydrocarbons cycloalkanes

Pathways of liquefied petroleum gas pyrolysis in hydrogen plasma:A density functional theory study

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2013年第3期22卷 484-492页

作者： xiaoyuan huang Jiaming Gu Dang-Guo Cheng Fengqiu Chen Xiaoli Zhan Department of Chemical and Biological Engineering Zhejiang University Key Laboratory of Biomass Chemical Engineering of Ministry of Education Department of Chemical and Biological EngineeringZhejiang University

A density functional theory （DFT） study has been conducted in this work to investigate the pyrolysis pathways of propane and n-butane, which are the main components of liquefied petroleum gas （LPG）, for better understanding the pyrolysis behavior of LPG in hydrogen thermal plasma. Over 60 possible reactions are considered. The reaction enthalpies and activation energies of these reactions are calculated and analyzed with a Gaussian method of B3LYP and basic set of 6-31G （d,p）. A most possible reaction pathway is brought up. According to this reaction pathway, the main products of LPG pyrolysis are acetylene, ethylene, methane, ethane and extra hydrogen. Acetylene mainly comes from the pyrolysis of propylene and ethylene, and hydrogen abstraction reactions are the main source of extra hydrogen gas. Active H. radicals are found to play a very important role in many reactions, and they can remarkably lower the energies needed for reactions.

关键词： LPG density functional theory plasma pyrolysis hydrogen