共搜索到3352条信息,每页显示10条信息,共336页。用时:0小时0分1秒687毫秒
="ChDivSummary" name="ChDivSummary"><正> The study concentrates mainly on the development of failure process in composite rock mass. By use of acoustic emission (AE), convergence inspection, pressure... relation between the damage and the characteristic parameters of acoustic emission can be determined. The location of the damage of rock mass can also be detected based on the acoustic emission couple......
分层高分子介质中的声吸收 王源升1,朱金华2,姚树人1,刘巨斌1 (1.海军工程大学,;2.四川大学高分子研究所,) 摘要:初步建立了分层高分子材料对水声吸收的数 学模型,测试了分层高分子材料的水声吸收性能并与数学模型的计算结果进行了比较,发现 应用该模型的计算结果与实测结果比较吻合,表明该数学模型在较大程度上能够反映分层高 分子声吸收性能的特性. 关键词:分层高分子; 声吸收; 模型; [全文内容正在添加中] ......
......
Synthesis of Spin-ladder Sr14Cu24O41Material by Citrates Sol-gel MethodWANG Lili~1 WEI Hui~1 HU Ni~1 XIONG Rui~(1*) YU Zuxing~1 TANG Wufeng~ SHI Jing~(1,2) (1.Key Laboratory of Acoustic & Photonic Material and Device,Ministry of Education,Wuhan 430072,China; 2.International Center for Materials Physics,Shenyang 110015,China)摘 要:<正>A new......
A Novel Process for High-efficient Synthesis of One-dimensional Carbon Nanomaterials from FlamesXiang QI~(1)) Jun ZHANG~(1)) Chunxu PAN~(1,2)+) 1)Department of Physics and Key Laboratory of Acoustic and Photonic Materials and Devices of Ministry of Education,Wuhan University,Wuhan,430072,China 2)Center for Electron Microscopy,Wuhan University,Wuhan 430072,China摘 要:
is incorporated into the thin film,forming Ti-Al-O compounds.While the irradiated region becomes transparent,the bond quality was evaluated by scanning acoustic microscopy.关键词:......
monitoring of acoustic emission, pressure and displacement, the ground pressure activity and the stability status of surrounding rock masses and the two shafts were assessed. Based on in-situ monitoring practice in Haigou mine,4 modes to judge rock stability according to the monitoring information of acoustic emission,pressure,and displacement were presented.关键词:......
C/E复合材料声发射信号小波分析及人工神经网络模式识别 刘哲军1,金周庚1,王健1 (1.航天材料及工艺研究所) 摘要:以复合材料为对象,以宽频带传感器及线阵列方式对各类模式试样采集了波形及信号参数,比较波形,信号参数,频谱及小波谱的特征,筛选出六类1300个样本,采用多分辨小波变换提取了5个特征向量,实现了特征空间的降维处理,采用B-P型反向传播神经网络构成了智能化模式分类器,研究了网络模型的学习效果和对与复合材料主要损伤机制有关的六类声发射信号的识别能力.试验结果表明,神经网络对六类信号的平均正确识别率达到90.4%.最佳识别率为97.2%.该方法成功用于90°,0°光滑和0°缺口三......
模式识别在复合材料声发射信号分析中的应用 张慧萍1,晏雄1,杨璧玲1 (1.东华大学纺织学院面料技术教育部重点实验室,上海,200051) 摘要:模式识别在复合材料声发射信号分析中的应用已初见成效.本文从信号的除噪与信号源的识别两方面综述了这一领域的研究,重点论述了特征的选取和模式识别方法的选择,并提出了目前研究中尚存在的一些问题及其展望. 关键词:模式识别; 复合材料; 声发射; 信号分析; [全文内容正在添加中] ......
单向复合材料板剪切破坏实验分析 费云鹏1,董国华1,陆荣林1 (1.同济大学固体力学教育部重点实验室) 摘要:本文分析了单向复合材料板在剪切时的微观破坏过程,结合声发射技术监测其损伤的起始与扩展过程,确定了完整的τ-γ曲线上几个特定阶段.在不同损伤阶段,从不同方位切取断面,分别用微差干涉法与电镜法观察其微观破坏过程. 关键词:复合材料声发射损伤; [全文内容正在添加中] ......