检索结果-南通市图书馆

Preparation for CSST:Star-galaxy Classification using a Rotationally Invariant Supervised Machine Learning Method

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第9期 138-148页

作者： Shiliang Zhang guanwen Fang Jie Song Ran Li yizhou gu Zesen Lin Chichun Zhou Yao Dai Xu Kong Institute of Astronomy and Astrophysics Anqing Normal University Deep Space Exploration Laboratory/Department of Astronomy University of Science and Technology of China School of Astronomy and Space Science University of Science and Technology of China National Astronomical Observatories Chinese Academy of Sciences Tsung-Dao Lee Institute and Key Laboratory for Particle Physics Astrophysics and CosmologyMinistry of EducationShanghai Jiao Tong University Department of Physics The Chinese University of Hong Kong School of Engineering Dali University

Most existing star-galaxy classifiers depend on the reduced information from catalogs,necessitating careful data processing and feature *** this study,we employ a supervised machine learning method (GoogLeNet) to automatically classify stars and galaxies in the COSMOS *** traditional machine learning methods,we introduce several preprocessing techniques,including noise reduction and the unwrapping of denoised images in polar coordinates,applied to our carefully selected samples of stars and *** dividing the selected samples into training and validation sets in an 8:2 ratio,we evaluate the performance of the GoogLeNet model in distinguishing between stars and *** results indicate that the GoogLeNet model is highly effective,achieving accuracies of 99.6%and 99.9%for stars and galaxies,***,by comparing the results with and without preprocessing,we find that preprocessing can significantly improve classification accuracy(by approximately 2.0%to 6.0%) when the images are *** preparation for the future launch of the China Space Station Telescope (CSST),we also evaluate the performance of the GoogLeNet model on the CSST simulation *** results demonstrate a high level of accuracy (approximately 99.8%),indicating that this model can be effectively utilized for future observations with the CSST.

关键词：

腹腔镜手术治疗胃肠道间质瘤的效果及预后情况

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中外医学研究 2024年第12期22卷 128-132页

作者：顾益洲陈尧张家港市第一人民医院江苏张家港215600

目的:探讨腹腔镜手术治疗胃肠道间质瘤的效果及预后情况。方法:从2020年4月—2022年4月于张家港市第一人民医院收治的胃肠道间质瘤患者中随机抽选100例作为观察对象,根据手术方法差异性将患者分为观察组(腹腔镜手术)和对照组(传统开腹手... 详细信息

目的:探讨腹腔镜手术治疗胃肠道间质瘤的效果及预后情况。方法:从2020年4月—2022年4月于张家港市第一人民医院收治的胃肠道间质瘤患者中随机抽选100例作为观察对象,根据手术方法差异性将患者分为观察组(腹腔镜手术)和对照组(传统开腹手术),各50例。比较两组手术效果和预后情况。结果:观察组术中出血量少于对照组,手术时间和切口长度均短于对照组,差异有统计学意义(P0.05)。结论:腹腔镜手术治疗胃肠道间质瘤患者,不仅可优化围手术期指标,降低并发症发生率和减少手术出血量,还可加快出院进度,预后评估良好。

关键词：腹腔镜手术胃肠道间质瘤围手术期指标安全性预后

维普期刊数据库博看期刊

The Jiao Tong University Spectroscopic Telescope Project

在线全文

学校读者我要写书评

暂无评论

Astronomical Techniques and Instruments 2024年第1期1卷 16-30页

作者： JUST Team Chengze Liu Ying Zu Fabo Feng Zhaoyu Li Yu Yu Hua Bai Xiangqun Cui Bozhong gu yizhou gu Jiaxin Han Yonghui Hou Zhongwen Hu Hangxin Ji Yipeng Jing Wei Li Zhaoxiang Qi Xianyu Tan Cairang Tian Dehua Yang Xiangyan Yuan Chao Zhai Congcong Zhang Jun Zhang Haotong Zhang Pengjie Zhang Yong Zhang Yi Zhao Xianzhong Zheng Qingfeng Zhu Xiaohu Yang Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China Department of Astronomy School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Nanjing Institute of Astronomical Optics&Technology Chinese Academy of SciencesNanjing 210042China University of Chinese Academy of Sciences NanjingNanjing 211135China University of Chinese Academy of Sciences Beijing 101408China Lenghu Technology Innovation Industrial Park Management Committee Lenghu 817400China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Department of Astronomy University of Science and Technology of ChinaHefei 230026China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China

The Jiao Tong University Spectroscopic Telescope(JUST)is a 4.4-meter f/6.0 segmented-mirror telescope dedicated to spectroscopic *** JUST primary mirror is composed of 18 hexagonal segments,each with a diameter of 1.1 *** provides two Nasmyth platforms for placing science *** Nasmyth focus fits a field of view of 10′and the other has an extended field of view of 1.2°with correction optics.A tertiary mirror is used to switch between the two Nasmyth *** will be installed at a site at Lenghu in Qinghai Province,China,and will conduct spectroscopic observations with three types of instruments to explore the dark universe,trace the dynamic universe,and search for exoplanets:(1)a multi-fiber(2000 fibers)medium-resolution spectrometer(R=4000-5000)to spectroscopically map galaxies and large-scale structure;(2)an integral field unit(IFU)array of 500 optical fibers and/or a long-slit spectrograph dedicated to fast follow-ups of transient sources for multi-messenger astronomy;(3)a high-resolution spectrometer(R~100000)designed to identify Jupiter analogs and Earth-like planets,with the capability to characterize the atmospheres of hot exoplanets.

关键词： Astronomical instrumentation Optical telescopes Large-scale structure of the universe Redshift surveys Time domain astronomy Exoplanet astronomy

银发网民成为无意识传谣者的原因与治理对策探究

在线全文

学校读者我要写书评

暂无评论

新闻研究导刊 2024年第4期15卷 72-74页

作者：顾亦周贾恩慧赵勇陈尚秋苏州城市学院城市文化与传播学院江苏苏州215104 苏州工艺美术职业技术学院江苏苏州215104 苏州大学传媒学院江苏苏州215123 江苏移动昆山分公司江苏昆山215300

60岁以上的银发网民在过去的研究中常被定位为因媒介素养低下、真伪辨别力差而有意识传播网络谣言的群体,但其中为数众多的无意识传谣者尚未引起学界、业界的广泛重视。文章对苏州地区95名退休老人日常使用手机社交应用(微信、抖音等)... 详细信息

60岁以上的银发网民在过去的研究中常被定位为因媒介素养低下、真伪辨别力差而有意识传播网络谣言的群体,但其中为数众多的无意识传谣者尚未引起学界、业界的广泛重视。文章对苏州地区95名退休老人日常使用手机社交应用(微信、抖音等)的情况研究,采用线下半结构访谈方法,并参考使用—满足理论,对银发网民在微信、抖音等平台中的社交行为进行考察,重点分析银发网民热衷信息转发并成为无意识传谣者的心理与现实动因。研究发现,在银发网民中,无意识传谣者比重较大,心理代偿、信息流瀑及技术陷阱是其不辨真假大量转发的核心因素,行为背后充满了仪式、从众、失控、冲动等力量刺激。文章由此警醒学界、业界对这一现象和相关群体予以足够重视,并从普法教育、亲情关怀、技术保障等视角提出了具体可行的治理对策,旨在呼吁全社会正确认识并重视银发网民的现实需求,帮助银发网民更好地适应网络,在社会层面减少谣言,营造风清气正的网络环境。

关键词：互联网银发网民网络谣言谣言治理无意识传谣

DESI Legacy Imaging Surveys Data Release 9:Cosmological constraints from galaxy clustering and weak lensing using the minimal bias model

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2023年第12期66卷 230-254页

作者： Haojie Xu Hekun Li Jun Zhang Xiaohu Yang Pengjie Zhang Min He yizhou gu Jian Qin Zhaozhou Li Antonios Katsianis Ji Yao Zhaoyu Wang Yirong Wang Liping Fu Department of Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory for Particle Astrophysics and Cosmology(MOE)/Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai 200240China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 201210China CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Centre for Astrophysics and Planetary Science Racah Institute of PhysicsThe Hebrew UniversityJerusalem 91904Israel Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Shanghai Key Lab for Astrophysics Shanghai Normal UniversityShanghai 200234China

We present a tentative constraint on cosmological parameters Ω_(m) and σ_(8) from a joint analysis of galaxy clustering and galaxygalaxy lensing from DESI Legacy Imaging Surveys Data Release 9(DR9),covering approximately 10000 square degrees and spanning the redshift range of 0.1 to *** study the dependence of cosmological parameters on lens redshift,we divide lens galaxies into seven approximately volume-limited samples,each with an equal width in photometric *** retrieve the intrinsic projected correlation function w_(p)(r_(p))from the lens samples,we employ a novel method to account for redshift ***,we measured the galaxy-galaxy lensing signal ΔΣ(r_(p))for each lens sample,using source galaxies selected from the shear catalog by applying our Fourier Quad pipeline to DR9 *** model these observables within the flatΛCDM framework,employing the minimal bias *** ensure the reliability of the minimal bias model,we apply conservative scale cuts:r_(p)>8 and 12 h^(-1)Mpc,for w_(p)(r_(p))and ΔΣ(r_(p)),*** findings suggest a mild tendency that S_(8)=σ_(8)√Ω_(m)/0.3increases with lens redshift,although this trend is only marginally *** we combine low redshift samples,the value of S8is determined to be 0.84±0.02,consistent with the Planck results but significantly higher than the 3×2 pt analysis by 2-5σ.Despite the fact that further refinements in measurements and modeling could improve the accuracy of our results,the consistency with standard values demonstrates the potential of our method for more precise and accurate cosmology in the future.

关键词： spatial distribution of galaxies statistical and correlative studies of properties observational cosmology

Ceria nanoparticles: biomedical applications and toxicity

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第5期25卷 361-388页

作者： Xiaoxuan FU Peng LI Xi CHEN Yuanyuan MA Rong WANG Wenxuan JI Jiakuo gu Bowen SHENG yizhou WANG Zhuhong ZHANG School of Pharmacy Key Laboratory of Molecular Pharmacology and Drug Evaluation(Yantai University)Ministry of EducationCollaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of ShandongYantai UniversityYantai 264005China Department of Nephrology Yantai Yuhuangding HospitalQingdao UniversityYantai 264005China Institute of Crop Science College of Agriculture and BiotechnologyZhejiang UniversityHangzhou 310058China

Ceria nanoparticles(CeO_(2) NPs)have become popular materials in biomedical and industrial fields due to their potential applications in anti-oxidation,cancer therapy,photocatalytic degradation of pollutants,sensors,*** methods,including gas phase,solid phase,liquid phase,and the newly proposed green synthesis method,have been reported for the synthesis of CeO_(2) *** to the wide application of CeO_(2) NPs,concerns about their adverse impacts on human health have been *** review covers recent studies on the biomedical applications of CeO_(2) NPs,including their use in the treatment of various diseases(e.g.,Alzheimer's disease,ischemic stroke,retinal damage,chronic inflammation,and cancer).CeO_(2) NP toxicity is discussed in terms of the different systems of the human body(e.g.,cytotoxicity,genotoxicity,respiratory toxicity,neurotoxicity,and hepatotoxicity).This comprehensive review covers both fundamental discoveries and exploratory progress in CeO_(2) NP research that may lead to practical developments in the future.

关键词： Ceria nanoparticle Synthetic method Biomedical application Oxidative stress Toxicity

Palladium Catalyzed Allylic Reaction of New Building Block to Construct Trifluoromethyl Adjacent tetra-Substituted Chiral Carbon Center

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

Palladium Catalyzed Allylic Reaction of New Building Block t...

中国化学会第十二届全国氟化学会议

作者： yizhou gu Qilong Shen Long Lu~* Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic Chemistry The Chinese Academy of Science 345Lingling Road Shanghai 200032 P.R.China Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic Chemistry The Chinese Academy of Science 345Lingling Road Shanghai 200032 P.R.China

＜正＞Development of new methods for the construction of all carbon-substituted quaternary carbon center containing a trifluoromethyl group in many pharmaceutical,veterinary and agrochemical compounds is a *** we describe a palladium（0）-catalyzed allylic substitution reaction for the construction of all carbon-substituted quaternary carbon center containing a trifluoromethyl group.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

AI环境下青年消费行为的智能化探讨

青年学报 2019年第4期 50-53页

作者：顾亦周吴雪张梅苏州大学新媒介与青年文化研究中心苏州大学传媒学院

当今AI应用的日益强大和青年人对它们的深度依赖形成了一种正向发展螺旋,"消费AI"在不断为"AI消费"进行筑基。在更广泛的文化层面上,"AI消费"和"消费AI"的深入,可能使得"技术崇拜"被深深植入当代青年文化的内核,这种崇拜(或者至少是推崇... 详细信息

当今AI应用的日益强大和青年人对它们的深度依赖形成了一种正向发展螺旋,"消费AI"在不断为"AI消费"进行筑基。在更广泛的文化层面上,"AI消费"和"消费AI"的深入,可能使得"技术崇拜"被深深植入当代青年文化的内核,这种崇拜(或者至少是推崇)会逐渐将其影响从消费转移到其他领域,例如学习教育、情感婚恋等,并熏陶渐染地改变青年文化的整体面貌。

关键词： AI 青年消费智能

人类与机器相遇,青年如何选择?——基于AI与青年生活方式问卷调查的发现

在线全文

学校读者我要写书评

暂无评论

青年学报 2019年第4期 42-50页

作者：马中红顾亦周唐家佳苏州大学传媒学院苏州大学新媒介与青年文化研究中心

本文以2018年7月的一次全国性网络调查问卷分析结果为基础,对当前环境下AI与青年之间在就业、情感、消费、隐私、游戏等多样性生活方式上的关系给出了清晰的量化研究结果,并在此基础上就青年人如何看待AI对自身的影响得出了七个重要的... 详细信息

本文以2018年7月的一次全国性网络调查问卷分析结果为基础,对当前环境下AI与青年之间在就业、情感、消费、隐私、游戏等多样性生活方式上的关系给出了清晰的量化研究结果,并在此基础上就青年人如何看待AI对自身的影响得出了七个重要的研究结论。青年人与AI之间主要呈现积极而正面的互动关系,同时在就业、隐私等方面引发程度不同的忧虑,但这些负面问题是可以解决的,这预示着未来AI会在青年文化生活中占据更为重要的地位和比重。

关键词： AI 青年生活方式隐私消费情感就业