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Structural Color Dynamic Graphics Display Based on Microlens Array 被引量:1
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作者 LI Xue-han LIU Ling-zhi +1 位作者 HUANG Min LI Xiu 《印刷与数字媒体技术研究》 北大核心 2025年第2期162-168,共7页
It is of great scientific significance to construct a 3D dynamic structural color with a special color effect based on the microlens array.However,the problems of imperfect mechanisms and poor color quality need to be... It is of great scientific significance to construct a 3D dynamic structural color with a special color effect based on the microlens array.However,the problems of imperfect mechanisms and poor color quality need to be solved.A method of 3D structural color turning on periodic metasurfaces fabricated by the microlens array and self-assembly technology was proposed in this study.In the experiment,Polydimethylsiloxane(PDMS)flexible film was used as a substrate,and SiO2 microspheres were scraped into grooves of the PDMS film to form 3D photonic crystal structures.By adjusting the number of blade-coated times and microsphere concentrations,high-saturation structural color micropatterns were obtained.These films were then matched with microlens arrays to produce dynamic graphics with iridescent effects.The results showed that by blade-coated two times and SiO2 microsphere concentrations of 50%are the best conditions.This method demonstrates the potential for being widely applied in the anticounterfeiting printing and ultra-high-resolution display. 展开更多
关键词 Structural color Microlens array Dynamic graphics display Moirémagnification Optical anti-counterfeiting
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Visualizing medicine:The case for implementing graphical abstracts in clinical reporting
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作者 Naveen Jeyaraman Madhan Jeyaraman +2 位作者 Swaminathan Ramasubramanian Sangeetha Balaji Arulkumar Nallakumarasamy 《World Journal of Methodology》 2025年第2期1-8,共8页
Graphical abstracts(GAs)are emerging as a pivotal tool in medical literature,enhancing the dissemination and comprehension of complex clinical data through visual summaries.This editorial highlights the significant ad... Graphical abstracts(GAs)are emerging as a pivotal tool in medical literature,enhancing the dissemination and comprehension of complex clinical data through visual summaries.This editorial highlights the significant advantages of GAs,including improved clarity,increased reader engagement,and enhanced visibility of research findings.By transforming intricate scientific data into accessible visual formats,these abstracts facilitate quick and effective knowledge transfer,crucial in clinical decision-making and patient care.However,challenges such as potential data misrepresentation due to oversimplification,the skill gap in graphic design among researchers,and the lack of standardized creation guidelines pose barriers to their widespread adoption.Additionally,while software such as Adobe Illustrator,BioRender,and Canva are commonly employed to create these visuals,not all researchers may be proficient in their use.To address these issues,we recommend that academic journals establish clear guidelines and provide necessary design training to researchers.This proactive approach will ensure the creation of high-quality GAs,promote their standardization,and expand their use in clinical reporting,ultimately benefiting the medical community and improving healthcare outcomes. 展开更多
关键词 graphical abstracts Clinical data dissemination Visual communication Research impact Academic publishing
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Latvia’s Next-gen Graphic Artists
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作者 Jeļena Koževnikova Ilze Lībiete 《Journal of Literature and Art Studies》 2025年第2期70-78,共9页
Conception of graphic art,is widely increased in nowadays,because of persistent acquire of new ideas and art practices,which is key feature of modern art.As a result,variety of graphic art grew heavily-constantly acqu... Conception of graphic art,is widely increased in nowadays,because of persistent acquire of new ideas and art practices,which is key feature of modern art.As a result,variety of graphic art grew heavily-constantly acquiring new aspects and experimenting with new materials,but also not forgetting about classic techniques of graphic art.That is why Latvia’s contemporary art is rich with outstanding graphics artists,which is masters of their profession.But time goes and everything sees it’s end,and on Latvia’s art horizon start to appear new faces and new talents of Latvia’s graphics art,which already had their opportunity to demonstrate highest level of their mastery and creativity,not only in Latvia,but also on international level.Living in a rhythm of modern fast-paced technology and innovation era,Latvia’s graphic artists,still say“Yes!”,to classic techniques of graphic art-linocutting,lithography and drypointing.However,they are open-minded persons and like to experiment with new techniques(for example-digiprint),or if it is suitable for their idea-combine them,to reach their goal.Aim of this paper is to get acquainted with Latvia’s next-gen graphic artists,their ideas and views,as well with results of their creative,acquiring brief review of Latvia’s graphic trends in general.As a result reader will become familiar not only with Latvia’s domestic artists and their creativity,but also will get general review of the current trends in the world of graphic art,which is not only classic,but also very innovative,regarding of new materials and techniques. 展开更多
关键词 graphic graphic’s techniques Latvia’s modern art graphic artists
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NGP-ERGAS: Revisit Instant Neural Graphics Primitives with the Relative Dimensionless Global Error in Synthesis
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作者 Dongheng Ye Heping Li +2 位作者 Ning An Jian Cheng Liang Wang 《Computers, Materials & Continua》 2025年第8期3731-3747,共17页
The newly emerging neural radiance fields(NeRF)methods can implicitly fulfill three-dimensional(3D)reconstruction via training a neural network to render novel-view images of a given scene with given posed images.The ... The newly emerging neural radiance fields(NeRF)methods can implicitly fulfill three-dimensional(3D)reconstruction via training a neural network to render novel-view images of a given scene with given posed images.The Instant Neural Graphics Primitives(Instant-NGP)method further improves the position encoding of NeRF.It obtains state-of-the-art efficiency.However,only a local pixel-wised loss is considered when training the Instant-NGP while overlooking the nonlocal structural information between pixels.Despite a good quantitative result,it leads to a poor visual effect,especially the completeness.Inspired by the stochastic structural similarity(S3IM)method that exploits nonlocal structural information of groups of pixels,this paper proposes a new method to improve the completeness of fast novel view synthesis.The proposed method first extends the thread-wised processing of the Instant-NGP to the processing in a customthread block(i.e.,a group of threads).Then,the relative dimensionless global error in synthesis,i.e.,Erreur Relative Globale Adimensionnelle de Synthese(ERGAS),of a group of pixels corresponding to a group of threads is computed and incorporated into the loss function.Extensive experiments validate the proposed method.It can obtain better quantitative results than the original Instant-NGP with fewer iteration steps.PSNR is increased by 1%.Amazing qualitative results are obtained,especially for delicate structures and details such as lines and continuous structures.With the dramatic improvements in the visual effects,our method can boost the practicability of implicit 3D reconstruction in applications such as self-driving and augmented reality. 展开更多
关键词 Neural radiance fields novel view synthesis 3D reconstruction graphic processing unit
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Exploration and Practice of Ideological and Political Education in Engineering Graphics Digital Extracurricular Counseling Course
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作者 Guolin Xu Tianxiang Liu Liang Ma 《Journal of Contemporary Educational Research》 2025年第7期239-247,共9页
In the context of the deep integration of digitalization and innovation and entrepreneurship education,this study focuses on the characteristics of schools and courses,investigates students’expectations and needs for... In the context of the deep integration of digitalization and innovation and entrepreneurship education,this study focuses on the characteristics of schools and courses,investigates students’expectations and needs for ideological and political elements,and deeply explores ideological and political cases such as the Beidahuang spirit,Daqing spirit,model worker spirit,and role models around them.It explores the integration practice of“curriculum ideological and political”in extracurricular tutoring teaching of engineering graphics,aiming to guide students to establish patriotism,love for schools,knowledge of agriculture,and love for agriculture,and effectively enhance the coordinated development of students’graphic skills and ideological and political literacy.Practice has shown that integrating ideological and political resources,incorporating ideological and political elements into curriculum content and practical activities,can effectively enhance the collaborative development of students’graphic skills and ideological and political literacy.At the same time,it provides new ideas and references for expanding ideological and political education to extracurricular tutoring courses. 展开更多
关键词 Engineering graphics Course ideology and politics Innovation and entrepreneurship education Extracurricular tutoring courses Integration path
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FL-Online:An x-ray crystallographic web-server for atomic-scale structure analysis of biomolecule
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作者 王宾堂 牛彤欣 +1 位作者 范海福 丁玮 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第7期37-42,共6页
FL-Online(http://fanlab.ac.cn) is an out-of-box modern web service featuring a user-friendly interface and simplified parameters, providing academic users with access to a series of online programs for biomolecular cr... FL-Online(http://fanlab.ac.cn) is an out-of-box modern web service featuring a user-friendly interface and simplified parameters, providing academic users with access to a series of online programs for biomolecular crystallography, including SAPI-online, OASIS-online, C-IPCAS-online and a series of upcoming software releases. Meanwhile, it is a highly scalable and maintainable web application framework that provides a powerful and flexible solution for academic web development needs. All the codes are open-source under MIT licenses in GitHub. 展开更多
关键词 graphical web service OASIS IPCAS direct methods protein crystallography
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Graphic Characterization and Visual Narrative in The History of Little Goody Two-Shoes(1765)
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作者 Russell Palmer 《外国文学研究》 CSSCI 北大核心 2024年第6期12-26,共15页
Focusing on The History of Little Goody Two-Shoes(1765),John Newbery's longest and most famous work of children's fiction,this article offers a corrective to previous scholarship that has routinely overlooked ... Focusing on The History of Little Goody Two-Shoes(1765),John Newbery's longest and most famous work of children's fiction,this article offers a corrective to previous scholarship that has routinely overlooked the significance of woodcut illustrations to characterization and narrative construction in early children's fiction.Unlike most eighteenth-century fiction,illustration was integral to Newbery's children's books,conceived at the onset,not added as embellishment to later editions.Routinely described as too small to be important or reduced to discussions of didacticism and ideology only,the cheap woodcuts contained in eighteenth-century children's fiction enabled reader-viewers of differing literacy levels to comprehend and imaginatively take part in narratives.In Goody Two-Shoes,illustrations elaborate,specify,and extend characterizations of Margery,while also engendering a means of maintaining a child-centric tale for young audiences in the face of an ever-aging protagonist.This article demonstrates how woodcuts enable the reader-viewer to construct a narrative that extends beyond what is written. 展开更多
关键词 eighteenth century print culture graphic narrative children's literature ILLUSTRATION
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Application of Perceived Teaching with Moderate Elimination of“Graphics”in Architectural Design Courses
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作者 LIU Hongyun WANG Xingyi +2 位作者 LI Tianjiao CHEN Yongsheng ZHANG Wenming 《Journal of Landscape Research》 2024年第1期43-47,共5页
Starting from the traditional form of“graphic”architectural education,this paper explores a teaching method of entity construction experience,instrument assistance,and digital virtual expression symbiosis symbiosis ... Starting from the traditional form of“graphic”architectural education,this paper explores a teaching method of entity construction experience,instrument assistance,and digital virtual expression symbiosis symbiosis from three aspects:environmental perception,ontology perception,and extension perception.Using physical perception as a medium,and gradually rising from active perception to a comprehensive expression of visual audience perception through practical operation,it allows students to have a more comprehensive understanding of the meaning of architectural design on the basis of the“graphic”expression paradigm. 展开更多
关键词 graphicS Beaux-Arts system Perceived teaching Digital technique Constructing Experience
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The Problems and Countermeasures in the Teaching of Graphic Design Majors in Universities
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作者 Chengmin Xiong 《Journal of Contemporary Educational Research》 2024年第8期20-25,共6页
As a cradle for cultivating and delivering graphic design professionals,the graphic design major in universities should keep up with the times,guided by the“Opinions on Deepening Undergraduate Education and Teaching ... As a cradle for cultivating and delivering graphic design professionals,the graphic design major in universities should keep up with the times,guided by the“Opinions on Deepening Undergraduate Education and Teaching Reform,and Comprehensively Improving the Quality of Talent Cultivation,”deepen teaching reform,and enhance the quality of talent cultivation.Based on this,this article analyzes the existing problems in the teaching of graphic design major and actively explores its teaching reform path,in order to promote the in-depth implementation of graphic design major teaching and even the entire graphic design teaching reform,comprehensively improve the quality of graphic design talent cultivation,and promote the great reform and development of higher education. 展开更多
关键词 UNIVERSITIES graphic design PROBLEM COUNTERMEASURE
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Research on Dynamic Graphic Features in Digital Media Interfaces
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作者 Yingquan Wang 《Journal of Electronic Research and Application》 2024年第2期103-108,共6页
In digital media interfaces,dynamic graphics integrate elements of animation design,graphic design,and cinematic language,presenting in various forms and demonstrating significant inclusivity.From the perspective of v... In digital media interfaces,dynamic graphics integrate elements of animation design,graphic design,and cinematic language,presenting in various forms and demonstrating significant inclusivity.From the perspective of visual cognition,by capturing dynamic graphics within the interface,three-dimensional information such as time and space is acquired,and the cognition process exhibits characteristics of spatial and temporal correlation.In terms of information cognition,dynamic representation fragments information,resulting in a sense of discontinuity and intermittent memory.The efficiency of information cognition and transmission is enhanced through the coordination of audio,video,and other elements.In aesthetic perception,with the rise of Internet culture,people’s aesthetic perceptions towards dynamic graphic design have evolved,showcasing a generalization of form and the instantaneous nature of content.Technically,the complexity of design and the diversity of applications have established dynamic graphics as a typical design style label in digital media interfaces. 展开更多
关键词 Digital media Dynamic graphics Visual cognition Information cognition Aesthetic perception
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Interactive Media Visual Interpretation of Traditional Chinese Graphics in Urban Public Spaces
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作者 Fu Zhang 《Journal of Electronic Research and Application》 2024年第3期42-46,共5页
This paper focuses on the application of interactive media technology in the visual interpretation of traditional graphic urban public spaces in China.Case studies and practical exploration show that interactive media... This paper focuses on the application of interactive media technology in the visual interpretation of traditional graphic urban public spaces in China.Case studies and practical exploration show that interactive media technologies such as projection mapping,interactive devices,virtual reality technology,etc.,have realized the diversity of traditional graphics display forms in urban public space.The rich interactive experience design enhances the sense of participation and experience of urban citizens and tourists and promotes the visual culture transmission of traditional Chinese graphics.The future urban public space exhibition is destined to continue to deepen the integration of technology and graphics,promote the visual communication of traditional Chinese graphics visual interpretation in urban public space,and promote sustainable innovation in cultural output in urban public space exhibitions around the world. 展开更多
关键词 Motion graphic design Public space Interactive media technology
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基于设计心理学的产品包装设计策略探究 被引量:5
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作者 段笔耕 金心亦 《包装工程》 北大核心 2025年第4期459-463,共5页
目的 设计心理学是研究人们在设计创造过程中的心态,以及设计对社会及其中个体所产生的心理反应,反过来再作用于设计,起到使设计更能够反映和满足人们心理作用的效果。从设计心理学角度探讨产品包装设计的方法,旨在使产品包装设计更符... 目的 设计心理学是研究人们在设计创造过程中的心态,以及设计对社会及其中个体所产生的心理反应,反过来再作用于设计,起到使设计更能够反映和满足人们心理作用的效果。从设计心理学角度探讨产品包装设计的方法,旨在使产品包装设计更符合设计心理学、用户的需求。方法 从设计心理学对设计实践的指导入手,探讨了产品包装设计中心理学的重要价值,并从三个方面阐述了基于设计心理学的产品包装设计策略。结论 设计心理学能够很好地抓住用户心理,遵循设计心理学进行产品包装设计能够很好地满足用户的需求,提升产品对消费者的吸引力。为此,在产品包装设计中,设计者必须要把握好消费者的心理变化,充分考虑色彩心理、图形心理和文字心理,运用各种方式、手段,把色彩、图形、文字、造型等多种视觉语言,通过有机的整合形成包装设计,对消费者的心理形成影响,进而促成其对产品的认同和购买。 展开更多
关键词 设计心理学 产品包装 色彩心理 图形心理 文字心理
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从造物到视觉信息传播的设计观念 被引量:3
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作者 朱永明 《艺术设计研究》 北大核心 2025年第1期88-93,139,140,共8页
造物设计思想有着深厚的中华文化传统与工艺美术渊源,也契合欧洲工业革命以来产业化设计的实践理念,而造物形式与功能关系更是长期被视为设计研究与创造的核心问题。近年来,造物设计已成为设计研究的热点,透过造物设计的视角探讨现代设... 造物设计思想有着深厚的中华文化传统与工艺美术渊源,也契合欧洲工业革命以来产业化设计的实践理念,而造物形式与功能关系更是长期被视为设计研究与创造的核心问题。近年来,造物设计已成为设计研究的热点,透过造物设计的视角探讨现代设计的本质与内涵,就会触及造物设计中造物功能、造物信息及信息传播设计的关系,这也给我们提出了新的问题与思考。特别是在媒体技术与传播大发展的今天,造物信息及视觉传播设计的重要性愈加凸显,并展现了不可替代的广泛应用性与巨大的社会影响。视觉信息传播独特且不依附造物的沟通、交流特性,丰富的社会、文化与艺术内涵,及其重要的战略价值,决定了其必然成为学界重要的研究领域与实践方向。 展开更多
关键词 造物 造物设计 信息传播 视觉传达设计 平面设计 观念
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融合聚类特征的改进MRF轨面缺陷分割方法 被引量:1
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作者 闵永智 刘洋 《北京航空航天大学学报》 北大核心 2025年第6期1863-1872,共10页
针对轨面缺陷样本数量少、种类多的特点,以及在真实场景下存在迁移学习效果不稳定、阈值分割易受环境因素影响的问题,提出一种零样本的改进马尔可夫随机场轨面缺陷分割方法。对采集的数据使用Gabor函数进行处理,突出缺陷特征,降低数据维... 针对轨面缺陷样本数量少、种类多的特点,以及在真实场景下存在迁移学习效果不稳定、阈值分割易受环境因素影响的问题,提出一种零样本的改进马尔可夫随机场轨面缺陷分割方法。对采集的数据使用Gabor函数进行处理,突出缺陷特征,降低数据维度,得到降维特征图;对处理后的特征图进行Kmeans聚类,缩减数据分布,降低反光和阴影的影响,并将聚类结果作为预分类矩阵;通过降维特征图和预分类矩阵构建改进马尔可夫随机场(MRF)双层图模型,并进行推理;根据模型推理出的预分类矩阵特征值来分析缺陷部分的局部几何结构;标记出缺陷区域,并完成缺陷分割。使用自采样数据集进行对比实验和消融实验,结果表明:所提方法在自采样数据集上的像素准确率、平均像素准确率、加权交并比、均交并比分别达到93.6%、80.7%、89.4%、68.2%,超过对比检测方法精度。 展开更多
关键词 图像处理 轨面缺陷 马尔可夫随机场 概率图模型 实例分割
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新工科背景下农业院校工程图学课程教学改革 被引量:1
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作者 王斌 李丽丽 张淑娟 《农业技术与装备》 2025年第4期89-91,94,共4页
以山西农业大学机器人工程专业工程图学课程为例,以工程应用为主线,能力培养为核心,通过对课程内容、教学方法、教学资源和评价体系的深入分析,提出一系列教学改革策略,在提高学生工程图学能力的同时,培养学生的创新思维和解决实际工程... 以山西农业大学机器人工程专业工程图学课程为例,以工程应用为主线,能力培养为核心,通过对课程内容、教学方法、教学资源和评价体系的深入分析,提出一系列教学改革策略,在提高学生工程图学能力的同时,培养学生的创新思维和解决实际工程问题的能力,促进工程图学课程教学质量的持续提高。 展开更多
关键词 新工科 工程图学课程 工程能力 课程建设
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基于Matrix Core的高性能多维FFT设计与优化 被引量:1
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作者 陆璐 祝松祥 +2 位作者 田卿燕 林海山 郭逸劼 《华南理工大学学报(自然科学版)》 北大核心 2025年第3期20-30,共11页
快速傅里叶变换(FFT)算法广泛应用于科学计算等领域。为了充分挖掘图形处理器(GPU)的计算能力并进一步提高FFT的计算效率,该文针对矩阵形式的Stockham FFT,提出了一种基于Matrix Core的高性能多维FFT计算方案。在计算优化方面,该方案利... 快速傅里叶变换(FFT)算法广泛应用于科学计算等领域。为了充分挖掘图形处理器(GPU)的计算能力并进一步提高FFT的计算效率,该文针对矩阵形式的Stockham FFT,提出了一种基于Matrix Core的高性能多维FFT计算方案。在计算优化方面,该方案利用Matrix Core加速FFT计算中的矩阵乘运算,同时通过编译器内部指令完成小粒度的矩阵乘加,使得Matrix Core支持更多尺寸的FFT计算。在内存优化方面,该方案使用2层迭代策略,以充分利用共享内存,减少与全局内存的数据交换;根据Matrix Core的矩阵数据在各个线程寄存器中的分布规律,直接在寄存器上完成FFT计算中大量存在的矩阵逐元素乘操作;通过对共享内存中的数据进行重排来缓解存储体冲突,并采用双缓冲策略缓解访存瓶颈。该文还提出了高效的矩阵转置策略,以加速多维FFT计算。在AMD MI250 GPU平台上将该方案与GPU上主流的高性能FFT计算库rocFFT和VkFFT进行了比较实验,结果表明:该方案在AMD MI250上的1维、2维和3维FFT平均计算效率均优于rocFFT和VkFFT,3维FFT的平均计算效率为rocFFT的1.5倍,为VkFFT的2.0倍,具有较好的性能提升;mcFFT的计算精度与rocFFT和VkFFT保持在相同水平。 展开更多
关键词 图形处理器 Matrix Core 快速傅里叶变换 矩阵乘法
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国际出版机构科技期刊图形化摘要要求分析与比较
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作者 邓履翔 杨宇 文晓丹 《编辑学报》 北大核心 2025年第2期161-167,共7页
通过查阅国际出版机构的官网、部分下辖期刊的网页,搜索相关文章等方式,采用数据调研法、比较分析法、归纳法,对29家典型国际出版公司的图形化摘要(graphical abstract,GA)要求进行搜集、整理,从形式要求、流程要求、内容要求和其他要求... 通过查阅国际出版机构的官网、部分下辖期刊的网页,搜索相关文章等方式,采用数据调研法、比较分析法、归纳法,对29家典型国际出版公司的图形化摘要(graphical abstract,GA)要求进行搜集、整理,从形式要求、流程要求、内容要求和其他要求等4个方面对筛选出的15家机构的图形化摘要要求进行比较,进而对期刊和作者给出GA使用的建议。研究表明:各出版机构的GA要求在表达方式、涉及内容、规范详细程度等多方面均存在不同,但是各出版机构基本都要求GA应做到简洁、突出内容、符合本刊整体风格;国际出版机构对GA的使用已较为广泛,标准也较为成熟,我国可予以借鉴,推广GA在我国科技期刊的应用,并尝试建立自己的GA标准体系。 展开更多
关键词 图形化摘要 科技期刊 国际出版机构
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基于薄膜传感器的传动锥齿轮柔性测试技术 被引量:1
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作者 谷士鹏 《中国测试》 北大核心 2025年第3期170-176,共7页
通过分析溅射气压对PdCr薄膜电阻温度系数的影响以及退火条件对Pt薄膜电阻率的影响,采用掩模板方法实现应变薄膜与热电阻薄膜图形化处理,并利用高温银浆烧结实现引线与敏感层薄膜的稳定连接,建立由Ni基合金基带、Y2O3过渡层、AlON-Al2O... 通过分析溅射气压对PdCr薄膜电阻温度系数的影响以及退火条件对Pt薄膜电阻率的影响,采用掩模板方法实现应变薄膜与热电阻薄膜图形化处理,并利用高温银浆烧结实现引线与敏感层薄膜的稳定连接,建立由Ni基合金基带、Y2O3过渡层、AlON-Al2O3复合绝缘层、PdCr应变敏感层/Pt热电阻敏感层、Al2O3防护层组成的薄膜传感器设计方法。将薄膜应变传感器、薄膜热电阻传感器同时柔性安装于传动锥齿轮进行试验测试。结果表明,在外部应力较高时薄膜应变传感器线性度为0.243%;薄膜热电阻传感器ΔR/ΔT斜率为0.4529,线性度较好。 展开更多
关键词 过渡层与复合绝缘层制备 敏感层制备及图形化 引线连接 柔性安装
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小学数学新教材中“图形与几何”领域的内容结构分析——以北师版为例 被引量:2
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作者 吕世虎 拉毛草 锁建军 《内蒙古师范大学学报(教育科学版)》 2025年第1期1-13,共13页
从体例结构、内容分布、呈现方式、习题设置等方面,对北京师范大学出版社编写出版的小学数学新教材中的“图形与几何”领域进行文本分析和量化统计,发现在体例结构上,单元标题和节标题明确体现了学习主题和学习活动,栏目设置丰富有趣且... 从体例结构、内容分布、呈现方式、习题设置等方面,对北京师范大学出版社编写出版的小学数学新教材中的“图形与几何”领域进行文本分析和量化统计,发现在体例结构上,单元标题和节标题明确体现了学习主题和学习活动,栏目设置丰富有趣且方式多样。在内容分布上,“图形的认识与测量”主题占“图形与几何”的五分之四,课程内容由浅入深、循序渐进、适当分段、螺旋上升。在呈现方式上,概念或原理主要通过生活实例、益智游戏、趣味故事引入,借助“情境+问题串”生成,再用数形结合方式、自然语言和符号语言相结合的方式表述;数学文化呈现以人文艺术、现实生活内容为主,以数学史、科学技术内容为辅。在习题设置上,习题数量随年级逐渐增加,习题背景以生活情境和数学情境为主,以文化情境和科学情境为辅,习题类型主要包括操作题、计算题、活动题。据此提出以下教学启示:第一,宏观把握教材呈现的体例结构,充分发挥各栏目在数学教学中的功能;第二,设计基于主题的单元整体教学,培养学生数学核心素养;第三,积极创设适切的问题情境,提升学生解决数学问题的能力;第四,探索微课、项目式学习等方式,落实数学文化的育人功能,激发学生的学习兴趣;第五,注重动手操作、自主探索、合作交流等学习方式,培养学生良好的学习习惯。 展开更多
关键词 图形与几何 内容结构 新教材 小学数学
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冲击荷载下道砟破坏几何形状特征研究
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作者 常建梅 田喜龙 冯怀平 《铁道工程学报》 北大核心 2025年第7期38-42,49,共6页
研究目的:在基础刚度突变的路桥过渡段,受冲击荷载作用有砟轨道道床道砟破碎比较严重,给线路安全运营和养护维修造成巨大压力,道砟破碎问题越来越受到研究人员关注。现有研究主要采用落锤冲击方法,围绕道砟的级配变化和整体破坏特征开展... 研究目的:在基础刚度突变的路桥过渡段,受冲击荷载作用有砟轨道道床道砟破碎比较严重,给线路安全运营和养护维修造成巨大压力,道砟破碎问题越来越受到研究人员关注。现有研究主要采用落锤冲击方法,围绕道砟的级配变化和整体破坏特征开展,而有关道砟几何形状变化的量化研究还比较少见。几何形状是道砟的重要参数,其变化特征对道床性能劣化具有重要影响。因此,本文在道砟冲击试验及宏观分析结果基础上,利用激光扫描和三维图形分析方法,研究道砟几何形状破坏特征和分布规律。研究结论:(1)冲击荷载作用下断裂破坏道砟占比显著增加,棱角破坏和断裂破坏道砟的颗粒占比约为3∶1,随粒径增加,发生断裂的道砟比例增加,块状道砟发生棱角破坏的比例约为针状和片状的2倍,针状、片状道砟发生断裂破坏的比例约为块状的3倍;(2)棱角破坏道砟在棱边、角等处的最大缺失深度通常在5 mm以内,棱角破坏道砟的形状系数随粒径增大而增加,块状道砟形状系数变化率较小,针状和片状道砟形状系数变化率较大,可达块状道砟形状系数变化率的3倍以上;(3)利用比表面积指标可区分两种道砟破坏类型,断裂道砟试样前后的比表面积呈线性关系,截距代表了断裂道砟增加表面消耗冲击能的性能,对断裂面的位置有重要影响;(4)本研究结果可为道床的劣化评估和维修策略制定提供参考。 展开更多
关键词 冲击荷载 道砟 几何形状 破坏特征 三维图形
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