检索结果-南通市图书馆

A Shared Natural Neighbors Based-Hierarchical Clustering Algorithm for Discovering Arbitrary-Shaped Clusters

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第8期80卷 2031-2048页

作者： Zhongshang Chen ji feng Fapeng Cai Degang Yang College of Computer and Information Science Chongqing Normal UniversityChongqing400030China

In clustering algorithms,the selection of neighbors significantly affects the quality of the final clustering *** various neighbor relationships exist,such as K-nearest neighbors,natural neighbors,and shared neighbors,most neighbor relationships can only handle single structural relationships,and the identification accuracy is low for datasets with multiple *** life,people’s first instinct for complex things is to divide them into multiple parts to *** the dataset into more sub-graphs is a good idea approach to identifying complex *** inspiration from this,we propose a novel neighbor method:Shared Natural Neighbors(SNaN).To demonstrate the superiority of this neighbor method,we propose a shared natural neighbors-based hierarchical clustering algorithm for discovering arbitrary-shaped clusters(HC-SNaN).Our algorithm excels in identifying both spherical clusters and manifold *** on synthetic datasets and real-world datasets,HC-SNaN demonstrates significant advantages over existing clustering algorithms,particularly when dealing with datasets containing arbitrary shapes.

关键词： Cluster analysis shared natural neighbor hierarchical clustering

Symmetry transformation of nonlinear optical current of tilted Weyl nodes and application to ferromagnetic MnBi_(2)Te_(4)

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 2024年第4期33卷 160-171页

作者：卢倬成冯济 International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China

A Weyl node is characterized by its chirality and *** develop a theory of how nth-order nonlinear optical conductivity behaves under transformations of anisotropic tensor and tilt, which clarifies how chirality-dependent and-independent parts of optical conductivity transform under the reversal of tilt and *** on this theory, we propose ferromagnetic Mn Bi2Te4as a magnetoelectrically regulated, terahertz optical device, by magnetoelectrically switching the chiralitydependent and-independent DC *** results are useful for creating nonlinear optical devices based on the topological Weyl semimetals.

关键词： nonlinear optical response topological Weyl semimetals chiral anomaly

Stability in Inverse Problem of Determining Two Parameters for the Moore-Gibson-Thompson Equation with Memory Terms

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2024年

作者： FU Songren CHEN Liangbiao ZHANG ji-feng Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy ofSciences School of Automation and Electrical Engineering Zhongyuan University of Technology Key Laboratory of Systems and Control Academy of Mathematics and Systems Science ChineseAcademy of Sciences

In this paper, the authors consider the inverse problem for the Moore-Gibson-Thompson equation with a memory term and variable diffusivity, which introduce a sort of delay in the dynamics,producing nonlocal effects in time. The H¨older stability of simultaneously determining the spatially varying viscosity coefficient and the source term is obtained by means of the key pointwise Carleman estimate for the Moore-Gibson-Thompson equation. For the sake of generality in mathematical tools,the analysis of this paper is discussed within the framework of Riemannian geometry.

关键词：

Fast X-ray imaging beamline at SSRF

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第9期35卷 68-81页

作者： Ke Li Hong-Lan Xie Ya-Nan Fu Fei-Xiang Wang Guo-Hao Du jian-feng ji Biao Deng Ti-Qiao Xiao Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

The fast X-ray imaging beamline(BL16U2)at Shanghai Synchrotron Radiation Facility(SSRF)is a new beamline that provides X-ray micro-imaging capabilities across a wide range of time scales,spanning from 100 ps toμs and *** beamline has been specifically designed to facilitate the investigation of a wide range of rapid phenomena,such as the deformation and failure of materials subjected to intense dynamic *** addition,it enables the study of high-pressure and high-speed fuel spray processes in automotive *** light source of this beamline is a cryogenic permanent magnet undulator(CPMU)that is cooled by liquid *** CPMU can generate X-ray photons within an energy range of 8.7-30 *** beamline offers two modes of operation:monochromatic beam mode with a liquid nitrogen-cooled double-crystal monochromator(DCM)and pink beam mode with the first crystal of the DCM out of the beam *** X-ray imaging methods were implemented in BL16U2:single-pulse ultrafast X-ray imaging,microsecond-resolved X-ray dynamic imaging,millisecond-resolved X-ray dynamic micro-CT,and high-resolution quantitative ***,BL16U2 is equipped with various in situ impact loading systems,such as a split Hopkinson bar system,light gas gun,and fuel spray *** the completion of the final commissioning in 2021 and subsequent trial operations in 2022,the beamline has been officially available to users from 2023.

关键词： Multiple time-scale X ray imaging Single-pulse X ray imaging Dynamic 2D imaging Dynamic micro-CT

Efficacy and safety of Qingfei Huatan formula in the treatment of acute exacerbation of chronic obstructive pulmonary disease:A multi-centre,randomised,double-blind,placebo-controlled trial

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Medicine 2024年第5期22卷 561-569页

作者： Hui-zhi Zhu Cheng-yi Li Liang-ji Liu jia-bing Tong Zhi-hui Lan Shu-guang Tian Qiao Li Xiang-li Tong ji-feng Wu Zhen-gang Zhu Su-yun Li jian-sheng Li Department of Respiratory Medicine the First Affiliated Hospital of Anhui University of Traditional Chinese MedicineHefei 230031Anhui ProvinceChina Graduate School Anhui University of Traditional Chinese MedicineHefei 230012Anhui ProvinceChina Department of Respiratory Medicine Affiliated Hospital of Jiangxi University of Traditional Chinese MedicineNanchang 330006Jiangxi ProvinceChina Department of Respiratory Diseases the First Affiliated Hospital of Henan University of Traditional Chinese MedicineZhengzhou 450000Henan ProvinceChina Department of Pulmonary Diseases Taihe Hospital of Traditional Chinese Medicine Affiliated to Anhui University of Traditional Chinese MedicineFuyang 236600Anhui ProvinceChina Department of Respiratory and Critical Care Medicine Jiangxi Province Hospital of Integrated Chinese and Western MedicineNanchang 330002Jiangxi ProvinceChina Department of Respiratory Medicine the First Affiliated Hospital of Tianjin University of Traditional Chinese MedicineTianjin 300381China Collaborative Innovation Center for Respiratory Disease Diagnosis and Treatment and Chinese Medicine Development of Henan Province Zhengzhou 450046Henan ProvinceChina

Background Chronic obstructive pulmonary disease(COPD),a common respiratory disease,can be effectively treated by traditional Chinese medicine(TCM).Qingfei Huatan,a TCM formula,has been reported to effectively alleviate the clinical symptoms of COPD ***,there is a lack of multi-centre,randomised,double-blind,controlled clinical trials documenting the clinical efficacy and safety of this formula in the treatment of acute exacerbation of COPD(AECOPD).Objective This study evaluated the efficacy and safety of Qingfei Huatan formula in the treatment of AECOPD,thereby providing high-quality clinical ***,setting,participants and interventions A total of 276 patients with AECOPD were included in this multi-centre,randomised,double-blind,placebo-controlled trial and were randomised into treatment and control groups at a ratio of 1:*** in the treatment and control groups took Qingfei Huatan granules or simulated Qingfei Huatan granules twice a day,for 14 days,in addition to Western medicine *** patients were followed up for 3 *** outcome measures The primary outcome was time taken to symptom *** secondary outcomes included duration of antibiotic use,clinical symptom and sign score,TCM syndrome score,dyspnoea score,and quality of life(QOL)***,the safety of the formula was assessed through routine urine and stool tests,electrocardiograms,liver and kidney function tests,and the observation of adverse events throughout the *** The time taken for effective stabilisation(P<0.05)and obvious stabilisation(P<0.01),and the duration of antibiotic use(P<0.05)were significantly shorter in the treatment group than in the control *** days 6,9,12 and 14 of treatment,clinical symptom and sign score decreased in both groups,particularly in the treatment group(P<0.01).On days 9,12 and 14 of treatment,the TCM syndrome scores of both groups were reduced(P<0.01),with more significant reductions in the treatm

关键词： Acute exacerbation of chronic obstructive pulmonary disease Clinical trial Syndrome of phlegm-heat congesting lung Qingfei Huatan formula Traditional Chinese medicine

学科大概念统摄下的初中地理、历史跨学科主题教学设计——以“黄河泥沙的‘功过’”为例

在线全文

学校读者我要写书评

暂无评论

地理教学 2024年第8期 36-40页

作者：冀峰苏州科技城外国语学校江苏苏州215000

跨学科主题教学是深化课堂教学,落实学生核心素养培育,促进师生共同发展,实现立德树人教育目标的重要途径。大概念统领下的跨学科主题教学是基于学科特点和学情等因素,顺应课程改革背景的新型教学策略。本文以“黄河泥沙的‘功过’”为... 详细信息

跨学科主题教学是深化课堂教学,落实学生核心素养培育,促进师生共同发展,实现立德树人教育目标的重要途径。大概念统领下的跨学科主题教学是基于学科特点和学情等因素,顺应课程改革背景的新型教学策略。本文以“黄河泥沙的‘功过’”为例,以培养学生人地协调观为核心目标,基于主题式教学理论,以地理课程为主干,融合历史学科知识,带领学生立足要素的时空尺度,感受泥沙对黄河中下游的影响,并由此提出大概念统摄下跨学科主题教学实施路径和教学策略,即学科知识主题化、主题目标引领化、主题情境融合化、问题活动进阶化、活动成果外显化、知识技能迁移化。

关键词：学科大概念跨学科主题教学初中地理黄河

拉曼光谱联合WOA特征筛选的矿井水源识别方法研究

在线全文

学校读者我要写书评

暂无评论

光谱学与光谱分析 2024年第4期44卷 1039-1044页

作者：周茗皓陈小刚崔继峰卞凯胡锋内蒙古工业大学理学院内蒙古呼和浩特010051 安徽理工大学电气与信息工程学院安徽淮南232001

在矿井突水灾害防治过程中,准确、快速判别突水水源类型对煤矿安全生产意义非常重大,而传统的水化学方法存在耗时长、检测复杂等不足,为此提出采用拉曼光谱进行矿井突水水源辨识这一新思路。首先从淮南矿区采集老空水、顶板砂岩裂隙水... 详细信息

在矿井突水灾害防治过程中,准确、快速判别突水水源类型对煤矿安全生产意义非常重大,而传统的水化学方法存在耗时长、检测复杂等不足,为此提出采用拉曼光谱进行矿井突水水源辨识这一新思路。首先从淮南矿区采集老空水、顶板砂岩裂隙水、奥灰水、太灰水和地表水以及它们混合的水样作为实验对象,并借助拉曼光谱系统收集水样的拉曼光谱数据。随后,采用常见的光谱预处理方法对原始拉曼光谱进行降噪。接着,采用鲸鱼优化算法(WOA)对水样的拉曼光谱进行特征信息筛选,得到最能够表征矿井水样的特征拉曼信息。最后,将筛选出的特征拉曼信息作为输入,分别构建BP神经网络(BPNN)、K-近邻算法(KNN)、支持向量机(SVM)、决策树(DT)以及朴素贝叶斯(NB)分类模型,以此来验证拉曼光谱结合WOA筛选特征拉曼信息用于矿井水源识别的可行性。实验证明:利用WOA可以从2048个拉曼数据点中筛选得到102个特征拉曼信息,将拉曼信息的点数缩减为原来的4.98%,而且WOA筛选的特征拉曼信息的建模精度高于全拉曼数据建模精度,此外,采用WOA筛选的特征拉曼信息构建BPNN、KNN、SVM、DT和NB水源辨识模型时,其分析速度都有着不同程度的提升。研究结果表明,采用WOA筛选矿井水源拉曼光谱的特征信息,可以有效地减少拉曼光谱数据的冗余,提升拉曼光谱分析的速度,这可以为矿井水源的快速检测提供借鉴。

关键词：拉曼光谱矿井突水水源识别鲸鱼优化算法特征筛选

东风西渐:中国文化符号国际传播的历史、现状与未来

在线全文

学校读者我要写书评

暂无评论

内蒙古社会科学 2024年第4期45卷 53-61页

作者：冯月季汕头大学长江新闻与传播学院广东汕头515000

13至19世纪,中国文化符号在西方世界广为传播,形成了具有独特东方意蕴和审美风格的“中国风”,并对西方世界的文化艺术和哲学思想产生了深远影响。在新的国际传播语境中,中国文化符号需要在继承历史传统价值和精神内涵的基础上,与当代... 详细信息

13至19世纪,中国文化符号在西方世界广为传播,形成了具有独特东方意蕴和审美风格的“中国风”,并对西方世界的文化艺术和哲学思想产生了深远影响。在新的国际传播语境中,中国文化符号需要在继承历史传统价值和精神内涵的基础上,与当代社会的价值原则和理念相结合进行文化符号的创新;通过国家顶层设计和整体规划建构国家文化符号战略传播体系,为全面推进中国式现代化提供持久的精神动力;积极参与全球文明互鉴和文化对话,为人类命运共同体的建构提供具有深厚文明底蕴和鲜明文化特质的“中国方案”。

关键词： “中国风” 文化符号国际传播文明互鉴人类命运共同体

在线全文

学校读者我要写书评

暂无评论

沉浸式新闻的生成逻辑、实践路径与价值反思

南昌大学学报（人文社会科学版） 2024年第1期55卷 132-140页

作者：冯月季汕头大学长江新闻与传播学院广东汕头515063

受新的数字媒介驱动,沉浸式新闻显现出虚拟现实弥合时空距离、技术仿真带来沉浸体验和人机交互产生地点幻觉三重技术逻辑。沉浸式新闻以其情境化的叙事方式和感官化的接收方式改变了传统新闻的样态,通过空间细节的多模态呈现、准客体物... 详细信息

受新的数字媒介驱动,沉浸式新闻显现出虚拟现实弥合时空距离、技术仿真带来沉浸体验和人机交互产生地点幻觉三重技术逻辑。沉浸式新闻以其情境化的叙事方式和感官化的接收方式改变了传统新闻的样态,通过空间细节的多模态呈现、准客体物的生成绽出和身体远程在场的情感体验为当下和未来的新闻实践提供了新的路径。沉浸式新闻的出现改变了传统的新闻定义,引发了对新闻客观性的反思,同时为人们探讨新媒介技术语境下新闻价值和数字伦理提供了想象的空间。

关键词：沉浸式新闻虚拟现实情感新闻客观性

维普期刊数据库博看期刊