检索结果-南通市图书馆

Potential energy sequences of characteristic atoms on basis of heats of formation of disordered Au（1-x）Cux alloys（Part 2）

在线全文

学校读者我要写书评

暂无评论

材料科学与工程（中英文版） 2009年第3期3卷 44-57页

作者： XIE You-qing LI xiao-bo LIU Xin-bi PENG Hong-jian NIE Yao-zhuang State Key Laboratory for Powder Metallurgy College of Materials Science and Engineering Institute of Powder Metallurgy Central South University Changsha 410083 China

维普期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

监控视频的前景运动物体提取方法

计算机工程与设计 2016年第3期37卷 695-699页

作者：肖碧波胡伟北京化工大学信息科学与技术学院北京100029

为能在包含复杂场景的监控视频中准确提取出前景运动物体,提出一种结合Vibe前景提取和背景减除的迭代算法。通过对Vibe前景提取算法和背景减除法进行研究与分析,指出当前前景运动物体提取方法在提取过程中的难点和不足;利用Vibe前景提... 详细信息

为能在包含复杂场景的监控视频中准确提取出前景运动物体,提出一种结合Vibe前景提取和背景减除的迭代算法。通过对Vibe前景提取算法和背景减除法进行研究与分析,指出当前前景运动物体提取方法在提取过程中的难点和不足;利用Vibe前景提取算法和背景减除法的优点,设计迭代算法;结合Vibe前景提取法的漏而不丢与背景减除法的多而无孔的特性,实现在监控视频中准确提取出前景运动物体的目的。实验结果表明,该算法可行有效,为监控视频的后续内容分析提供了准确的前景运动物体数据。

关键词：监控视频前景物体提取 Vibe 视频内容分析背景减除法

High-dense nanocrystalline W-based alloy prepared by hot isostatic pressing with uniform microstructure, ultrahigh hardness and good thermal stability

在线全文

学校读者我要写书评

暂无评论

Tungsten 2025年第1期7卷 120-136页

作者： Zao-Ming Wu Lin He Lin-Sen Ye xiao-Feng Yang Jia-Jia Zhang Hong-bo Lei Institute of Materials China Academy of Engineering Physics

High-density uniform microstructure nanocrystalline W-10wt.% Cr-5wt.% Y（W-10Cr-5Y） alloy with an average grain size of 85 nm and a relative density of 99.8% was successfully prepared.W-Cr-Y alloys with different amounts of second-phase particles were prepared by high-energy ball milling and hot isostatic pressing *** effects of composition design,ball milling parameters,and sintering parameters on the microstructure of W-Cr-Y alloys were studied.A feasible technology for controlling the synthesis of high-density nanocrystalline W-based alloys has been *** microstructure analysis of nanocrystalline W-10Cr-5Y alloy shows that there are two types of doping in the second phase:intergranular doping and intragranular *** "uniform distribution YOx-rich particles" effectively suppresses the grain growth of W and leads to the formation of nanocrystalline W-10Cr-5Y alloy.W-10Cr-5Y has an ultra-high hardness,with a Vickers hardness of 1312±12 kgf·***-temperature annealing treatment shows that W-10Cr-5Y has good thermal stability at 1000 and1100℃,as demonstrated by the comparison of Vickers hardness and grain size between annealed and unannealed alloys.

关键词： Hot isostatic pressing Microstructure Nanocrystalline tungsten Thermal stability Vickers hardness

新思维“4-X”人才培养模式下本科生就业创业能力培养研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

教育教学论坛 2018年第33期 96-97页

作者：陈星肖碧波三峡大学电气与新能源学院湖北宜昌443002 国网湖北省电力公司远安县供电公司湖北远安444200

在校企合作背景下,提出了一种"4-X"应用型人才培养模式的新思维,即大学本科为4学年,本科生在X期间进行企业实践,其他时间在校学习基础知识。这种模式使得校企合作环节与本科生在校学习环节互相补充,形成有机整体,从而更加全面、深入、... 详细信息

在校企合作背景下,提出了一种"4-X"应用型人才培养模式的新思维,即大学本科为4学年,本科生在X期间进行企业实践,其他时间在校学习基础知识。这种模式使得校企合作环节与本科生在校学习环节互相补充,形成有机整体,从而更加全面、深入、系统地提高了本科生的就业和创业能力。

关键词：校企合作 “4-X” 应用型人才培养模式就业创业

Formation and evolution of supercritical geofluid

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2025年第1期68卷 39-51页

作者： Huaiwei NI Yilin xiao xiaolin XIONG Xiandong LIU Chunxiao GAO Yi-Xiang CHEN Yunguo LI Wan-Cai LI Xuan GUO Yang-Yang WANG Dong-bo TAN Li ZHANG State Key Laboratory of Lithospheric and Environmental Coevolution University of Science and Technology of China Deep Space Exploration Laboratory/School of Earth and Space Sciences University of Science and Technology of China Guangzhou Institute of Geochemistry Chinese Academy of Sciences School of Earth Sciences and Engineering Nanjing University State Key Lab of Superhard Materials Jilin University

In this work, we provide a comprehensive review on the formation, evolution, properties, and effects of supercritical geofluid. In Earth's interior, enhanced miscibility between H2O and silicate by the addition of special components or by the increase of pressure and temperature gives rise to supercritical geofluid with a significant amount of both H2O and silicate *** formation of supercritical geofluid in magmatic-hydrothermal systems, typified by pegmatite system, is governed by meltfluid critical curve. The formation of supercritical geofluid in metamorphic systems, typified by subducted slab, is governed by the second critical end point. Experimental results suggest that the presence of boron and fluorine in pegmatite system makes it possible to form supercritical geofluid at crustal depths, but the release of supercritical geofluid from subducted slab is withheld until almost 100 km depth. A major presence of both H2O and depolymerized structural units（monomers, dimers, etc.） endows supercritical geofluid with unique physical properties including low density, low elastic moduli, low viscosity, high diffusivity,and high electrical conductivity. Supercritical geofluid can effectively mobilize a variety of elements even including high field strength elements and heavy rare earth elements. The chemical signatures of supercritical geofluid can be inherited by metasomatized mantle and mantle-derived melts, and this could give an explanation of the oxidation of arc magmas. Phase separation of supercritical geofluid through the mechanism of spinodal decomposition leads to formation of a melt network. Multiphase fluid inclusions recovered from subduction zone rocks and pegmatites are possible relics of supercritical geofluid. Supercritical geofluid can cause electrical anomaly and low seismic velocity near the top of subducted slab, and can be linked with intermediate-focus earthquakes. Supercritical geofluid may have played a crucial role in the formation of pe

关键词： Supercritical geofluid Miscibility Subduction zone Pegmatite

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

内窥镜的维护和故障分析与处理

医疗设备信息 2005年第3期20卷 61-61,64页

作者：吴竞雄肖碧波佛山市中医院广东佛山528000

本文主要介绍了内窥镜的原理、特点 ,以及其日常的维护保养方法 ,同时对其常见故障进行了分析 ,并提出了解决故障的方法。

关键词：内窥镜、维护保养、故障现象

在线全文

学校读者我要写书评

暂无评论

n低温等离子设备在手术系统中的应用

医疗装备 2005年第5期18卷 16-17页

作者：吴竞雄肖碧波佛山中医院广东佛山528000

本文主要介绍了低温等离子设备的工作原理、性能、特点及其在手术中的应用,对其治疗效果进行了分析。

关键词：低温等离子手术系统设备工作原理治疗效果手术中优缺点

在线全文

学校读者我要写书评

暂无评论

基于多摄像头拼接的视频摘要

电子设计工程 2014年第17期22卷 185-188页

作者：宋戈胡伟肖碧波北京化工大学北京100029

根据sift经典算法和视频摘要原理,对多摄像头实时拼接在视频摘要上的应用进行了研究,通过将每组对应帧图像按照首帧图像配准后产生的变换矩阵和剪切模板进行变形及融合,使多摄像头实时合成一个;根据碰撞能量约束,对新摄像头中的运动物... 详细信息

根据sift经典算法和视频摘要原理,对多摄像头实时拼接在视频摘要上的应用进行了研究,通过将每组对应帧图像按照首帧图像配准后产生的变换矩阵和剪切模板进行变形及融合,使多摄像头实时合成一个;根据碰撞能量约束,对新摄像头中的运动物体在时间线上重新组合,完成视频摘要。实验利用了摄像头相对位置固定的条件,并充分考虑视频分辨率对实时效果的影响,与单摄像头相比,多摄像头动态拼接的视频摘要在单位时间内具有更高的信息量。

关键词：多摄像头实时视频摘要 sift

Double [5]carbohelicene: facile synthesis, chiroptical properties,isomerization study, and lasing application

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期68卷 233-240页

作者： Peipei Liu Yantong Li Meng-Xiang Wu Hao Kang xiao-Li Zhao Lin Xu Linlin Liu xiaodong Li Junfeng Fang Zhiwei Fang Ya Cheng Hai-bo Yang Huakang Yu Xueliang Shi State Key Laboratory of Petroleum Molecular & Process Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesSchool of Chemistry and Molecular Engineering East China Normal University School of Physics and Optoelectronics South China University of Technology Institute of Polymer Optoelectronic Materials & Devices State Key Laboratory of Luminescent Materials & Devices South China University of Technology School of Physics and Electronic Science Engineering Research Center of Nanophotonics & Advanced Instrument Ministry of EducationEast China Normal University State Key Laboratory of Precision Spectroscopy School of Physics and Electronic Science East China Normal University

Double carbohelicenes have attracted considerable attention due to their aesthetic structures, distinct π-conjugation extension, inherent chirality, and intriguing optical and electronic properties. Herein, the concise de novo synthesis of a new double[5]carbohelicene 1 together with its chiroptical properties, isomerization process and lasing application is presented. 1 was synthesized by a simple protocol involving the formation of a 6,6′-bipentacene as the key intermediate. It is worth noting that1 existed as two diastereomers 1-PP/MM and 1-PM, which were successfully isolated and unambiguously confirmed by Xray crystallography. The optical resolution of the racemic 1-PP/MM was successfully achieved by chiral-phase highperformance liquid chromatography（HPLC）, and 1-PP and 1-MM were characterized by circular dichroism. Interestingly, it was found that 1-PP/MM could be completely isomerized to 1-PM upon heating, and the detailed thermodynamics and kinetics of the isomerization process were systematically investigated. 1-PM exhibited deep-red luminescence with emission maximum at 723 nm and fluorescence quantum yield as high as 32.95%. Consequently, we can showcase the lasing application of 1-PM by doping with epoxy resin to assemble a bottle microlaser spontaneously, which the lasing wavelength is 796.6 nm at a threshold of 0.8 m J cm-2. We believe that our studies, including the facile synthesis methodology, detailed isomerization studies, and lasing application, will shed some light on the design and synthesis of novel carbohelical systems with more functions.

关键词： double carbohelicene optical resolution organic laser isomerization X-ray diffraction