检索结果-南通市图书馆

维普期刊数据库博看期刊

定向师范生乡土情怀培养的现实困境及纾困路径

在线全文

学校读者我要写书评

暂无评论

当代教育理论与实践 2024年第4期16卷 151-156页

作者：胡志明袁思诗湖南科技大学人文学院湖南湘潭411201

定向师范生的乡土情怀是关系到乡村地区教师队伍建设的关键性因素,也是定向师范生扎根乡村、奉献乡村的内在动力源泉。在乡村教师队伍建设取得显著成就的同时,定向师范生乡土情怀培养的现实困境制约着乡村地区教育的高质量发展。通过对... 详细信息

定向师范生的乡土情怀是关系到乡村地区教师队伍建设的关键性因素,也是定向师范生扎根乡村、奉献乡村的内在动力源泉。在乡村教师队伍建设取得显著成就的同时,定向师范生乡土情怀培养的现实困境制约着乡村地区教育的高质量发展。通过对定向师范生乡土情怀的内涵、现实困境进行深入分析,从培养目标、课程设置、实践环节和评价体系等方面提出了一系列针对性的纾困路径,以期为定向师范生的培养提供有益的参考。

关键词：定向师范生乡土情怀现实困境纾困路径

加工工艺对高强度15-5PH钢力学性能与侵彻性能的影响

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

北京理工大学学报 2024年第3期44卷 251-259页

作者：程军吴巍胡志明张笑瀛 63863部队吉林白城137001 湖南航天有限责任公司飞行器技术分公司湖南长沙410205 南京理工大学机械工程学院江苏南京210094

为获得加工工艺对高强度钢性能的影响,选取激光选区熔化(selective laser melting,SLM)和锻造工艺加工弹丸,通过镜像观测、准静态、SHPB和混凝土侵彻等研究手段,对比分析了三种SLM制造工艺以及锻造工艺对于15-5PH钢性能的影响.结果表明,... 详细信息

为获得加工工艺对高强度钢性能的影响,选取激光选区熔化(selective laser melting,SLM)和锻造工艺加工弹丸,通过镜像观测、准静态、SHPB和混凝土侵彻等研究手段,对比分析了三种SLM制造工艺以及锻造工艺对于15-5PH钢性能的影响.结果表明,SLM技术细化了15-5PH钢组织的晶粒,SLM成型的15-5PH钢力学性能有提升,其中SLM-B工艺的提升效果明显,SLM-B成型的15-5PH钢的准静态屈服强度相较于锻造工艺提升幅度达13.1%;其动态屈服强度相较于锻造工艺钢提高了9.0%;且SLM-B工艺对弹丸抗磨蚀性能最好.试验结果表明SLM工艺提高了15-5PH钢力学性能和抗磨蚀能力.

关键词：激光选区熔化 15-5PH钢力学性能侵彻磨蚀

在线全文

学校读者我要写书评

暂无评论

局域共振声学超材料耦合效应研究

压电与声光 2024年第4期46卷 586-590页

作者：项兴华雷怡俊胡志明刘金涛国网浙江省电力有限公司紧水滩水力发电厂浙江丽水323000 浙江工业大学土木工程学院浙江杭州310000

针对传统的声学超材料存在降噪频率窄、造价成本过高、实现难度大等诸多问题,提出一种带柔性薄膜结构的Helmholtz共振腔声学超材料结构,以局域共振耦合效应现象为出发点,推导出Helmholtz共振腔和柔性薄膜的数学模型。运用COMSOL Multiph... 详细信息

针对传统的声学超材料存在降噪频率窄、造价成本过高、实现难度大等诸多问题,提出一种带柔性薄膜结构的Helmholtz共振腔声学超材料结构,以局域共振耦合效应现象为出发点,推导出Helmholtz共振腔和柔性薄膜的数学模型。运用COMSOL Multiphysics软件对模型进行仿真分析,研究表明,该结构产生了2个局域共振峰值。为了实现对声学超材料消声频带的控制,向薄膜内注入液体。实验测试表明,当注液量从0增至35 mL时,薄膜峰值处的共振频率从612 Hz偏移到446 Hz,偏移量为166 Hz。所设计的局域共振声学超材料在频带范围内对低频噪声具有良好的控制效果,为声学超材料的设计提供了一种方法。

关键词：局域共振声学超材料噪声 Helmholtz共振腔

中学语文教师乡土情怀培育的现实困境及优化策略

在线全文

学校读者我要写书评

暂无评论

语言与文化研究

语言与文化研究 2024年第4期32卷 109-111页

作者：黄婷婷胡志明湖南科技大学湘潭411201

乡土情怀是中华民族传统文化的重要组成部分,对于培养青少年的民族自豪感和文化认同具有重要意义。在乡村振兴的大背景下,县域中学语文教师作为乡土情怀教育的重要实施者,在教育过程中承担着重要责任。然而,在实际教学中,中学语文教师... 详细信息

乡土情怀是中华民族传统文化的重要组成部分,对于培养青少年的民族自豪感和文化认同具有重要意义。在乡村振兴的大背景下,县域中学语文教师作为乡土情怀教育的重要实施者,在教育过程中承担着重要责任。然而,在实际教学中,中学语文教师面临着诸多现实困境,影响了乡土情怀教育的实施效果。中学语文教师应在语文教学中加强资源建设、转变教育观念、创新教学方法,厚植学生乡土情怀,要真正做到以文化人,达到情感上的共鸣。

关键词：中学语文教师乡土情怀现实困境优化策略

Temporal continuity of visual attention for future gaze prediction in immersive virtual reality

在线全文

学校读者我要写书评

暂无评论

Virtual Reality & Intelligent Hardware 2020年第2期2卷 142-152页

作者： zhiming hu Sheng LI Meng GAI Department of Computer Science and Technology School of Electronic Engineering and Computer SciencePeking UniversityBeijing 100871China Beijing Engineering Technology Research Center of Virtual Simulation and Visualization Peking UniversityBeijing 100871China

Background Eye tracking te chnology is receiving increased attention in the field of virtual ***,future gaze prediction is crucial in pre-computation for many applications such as gaze-contingent rendering,advertisement placement,and content-based *** explore future gaze prediction,it is necessary to analyze the temporal continuity of visual attention in immersive virtual *** In this paper,the concept of temporal continuity of visual attention is ***,an autocorrelation function method is proposed to evaluate the temporal ***,the temporal continuity is analyzed in both free-viewing and task-oriented *** Specifically,in free-viewing conditions,the analysis of a free-viewing gaze dataset indicates that the temporal continuity performs well only within a short time interval.A task-oriented game scene condition was created and conducted to collect users'gaze *** analysis of the collected gaze data finds the temporal continuity has a similar performance with that of the free-viewing *** continuity can be applied to future gaze prediction and if it is good,users'current gaze positions can be directly utilized to predict their gaze positions in the *** The current gaze's future prediction performances are further evaluated in both free-viewing and task-oriented conditions and discover that the current gaze can be efficiently applied to the task of short-term future gaze *** task of long-term gaze prediction still remains to be explored.

关键词： Temporal continuity Visual attention Autocorrelation analysis Gaze prediction Virtual reality

Guided Wave Propagation in Multilayered Two-dimensional Quasicrystal Plates with Imperfect Interfaces

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2022年第4期35卷 694-704页

作者： Xin Feng Liangliang Zhang zhiming hu Han Zhang Yang Gao College of Science China Agricultural UniversityBeijing 100083China College of Engineering China Agricultural UniversityBeijing 100083China China State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190China

An analytical solution of the guided wave propagation in a multilayered twodimensional decagonal quasicrystal plate with imperfect interfaces is *** to the elastodynamic equations of quasicrystals(QCs),the wave propagating problem in the plate is converted into a linear control system by employing the state-vector approach,from which the general solutions of the extended displacements and stresses can be obtained,These solutions along the thickness direction are utilized to derive the propagator matrix which connects the physical variables on the lower and upper interfaces of each *** special spring model,which describes the discontinuity of the physical quantities across the interface,is introduced into the propagator relationship of the multilayered *** total propagator matrix can be used to propagate the solutions in each interface and each layer about the multilayered *** addition,the traction-free boundary condition on the top and bottom surfaces of the laminate is considered to obtain the dispersion equation of wave propagation,Finally,typical numerical examples are presented to illustrate the marked influences of stacking sequence and interface coeficients on the dispersion curves and displacement mode shapes of the QC laminates.

关键词： Two-dimensional QC materials Wave propagation Dispersion curve State vector approach Propagator matrix Imperfect interface

开挖顺序及内支撑早期刚度对软土基坑稳定性影响规律

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

建筑科学与工程学报 2024年第2期41卷 181-190页

作者：管大刚胡志明郑鹏鹏袁山陈保国张艳林中国水利水电第七工程局有限公司四川成都610081 中国地质大学工程学院湖北武汉430074

深基坑开挖变形控制是软土基坑工程的难题,工程中常采用密集的混凝土内支撑来提高支撑刚度,然而实际工程中未能合理考虑软土深基坑的开挖顺序和混凝土内支撑早期刚度影响,往往导致基坑实际变形远大于设计值。结合珠三角水资源配置工程... 详细信息

深基坑开挖变形控制是软土基坑工程的难题,工程中常采用密集的混凝土内支撑来提高支撑刚度,然而实际工程中未能合理考虑软土深基坑的开挖顺序和混凝土内支撑早期刚度影响,往往导致基坑实际变形远大于设计值。结合珠三角水资源配置工程的软土深基坑,利用验证后的数值模拟方法研究了不同开挖顺序及混凝土内支撑早期刚度对基坑受力和变形特性的影响规律,得出了分层分区非对称开挖和对称开挖对地连墙水平位移和地表沉降的影响规律。结果表明:尽管非对称开挖会造成基坑两侧的地连墙位移和地表沉降差异,但是密集内支撑条件下非对称开挖比对称开挖对于基坑周围地表沉降和地连墙水平位移影响更小并能够大量节约工期;受混凝土内支撑早期刚度影响,施作内支撑后越早进入下一步开挖,地连墙水平位移和周围地表沉降越大;考虑内支撑早期刚度影响时基坑上部的内支撑轴力会增大,而下部的内支撑轴力会减小,早期刚度越小,这种趋势越明显;现场施工时难以实时动态监测混凝土的弹性模量,极易造成内支撑轴力的早期监测数据失真,甚至给工程带来错误决策。

关键词：深基坑软土开挖顺序混凝土内支撑早期刚度变形特性

Numerical Study of Heat Transfer Enhancement in the Electric Vehicle Battery via Vortex‑Induced Agitator

在线全文

学校读者我要写书评

暂无评论

Automotive Innovation 2023年第2期6卷 244-255页

作者： Yubo Lian Yinsheng Liao Jianjian Liu zhiming hu Haolun Xu BYD Auto Industry Company Limited 518118 ShenzhenChina

Convective heat transfer plays an important role in the development of a high-performance battery *** vehicles carry a large amount of the battery cells to reach a longer range of endurance *** diffusion around the battery cells can be considered as obstacles to improve the convective heat transfer *** this paper,a novel agitator taking advantage of strong vortices is designed to disrupt the thermal boundary layer around the battery cells,thereby improving the fluid mixing for enhanced convective heat transfer.A fluid–structure interaction algorithm is developed to simulate the convective heat transfer rate at various flapping *** the comparison with clean channel,the vortex-induced vibra-tion by the agitated beam can increase the average Nusselt number by 119.59%.This research can be applied to optimize the thermal-structure design inside the electric vehicle battery.

关键词： Electric vehicle battery Thermal management Fluid–structure interaction Air cooling

Toward automatic estimation of urban green volume using airborne LiDAR data and high resolution Remote Sensing images

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2013年第1期7卷 43-54页

作者： Yan huANG Bailang YU Jianhua ZHOU Chunlin hu Wenqi TAN zhiming hu Jianping WU Key Laboratory of Geographic Information Science (Ministry of Education) East China Normal University Shanghai 200241 China Shanghai Landscape and City Appearance Administration Information Center Shanghai 200040 China

Urban green volume is an important indicator for analyzing urban vegetation structure, ecological evaluation, and green-economic estimation. This paper proposes an object-based method for automated estimation of urban green volume combining three-dimensional （3D） information from airborne Light Detection and Ranging （LiDAR） data and vegetation information from high resolution remotely sensed images through a case study of the Lujiazui region, Shanghai, China. High resolution airborne near-infrared photographs are used for identifying the urban vegetation distribution. Airborne LiDAR data offer the possibility to extract individual trees and to measure the attributes of trees, such as tree height and crown diameter. In this study, individual trees and grassland are identified as the independent objects of urban vegetation, and the urban green volume is computed as the sum of two broad portions： individual trees volume and grassland volume. The method consists of following steps： generating and filtering the normalized digital surface model （nDSM）, extracting the nDSM of urban vegetation based on the Normalized Difference Vegetation Index （NDVI）, locating the local maxima points, segment- ing the vegetation objects of individual tree crowns and grassland, and calculating the urban green volume of each vegetation object. The results show the quantity and distribution characteristics of urban green volume in the Lujiazui region, and provide valuable parameters for urban green planning and management. It is also concluded from this paper that the integrated application of LiDAR data and image data presents an effective way to estimate urban green volume.

关键词： Urban areas Vegetation mapping Remote sensing Environmental quality