助手标题  
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
   sonic velocity measurement 的翻译结果: 查询用时:0.168秒
图标索引 在分类学科中查询
所有学科
物理学
更多类别查询

图标索引 历史查询
 

sonic velocity measurement
相关语句
  相似匹配句对
     AIRFOIL DESIGN AT SONIC VELOCITY
     M=1音速流翼型设计计算
短句来源
     On Errors of Calculating Sonic Slowness and Velocity.
     探讨声波时差的计算误差和计算速度
短句来源
     and ④ velocity correction.
     ④速度校正。
短句来源
     Group Velocity and Dispersion
     群速度及色散
短句来源
     The Sonic Soot-blower
     声波吹灰器
短句来源
查询“sonic velocity measurement”译词为用户自定义的双语例句

    我想查看译文中含有:的双语例句
例句
没有找到相关例句


Effects of physical aging on the structure, mechanical properties and crystallization behavior of amorphous PET film and fiber are studied by density,DSC,stress-strain curve ,solvent-induced crystallization and sonic velocity measurements. It is shown that both the temperature and the solvent-induced crystallization as well as the diffusion velocity of toluol into PET are slow down after being annealed below Tg,an endothermic peak is appeared on the DSC curve with the increase of Tg,its initial modulus...

Effects of physical aging on the structure, mechanical properties and crystallization behavior of amorphous PET film and fiber are studied by density,DSC,stress-strain curve ,solvent-induced crystallization and sonic velocity measurements. It is shown that both the temperature and the solvent-induced crystallization as well as the diffusion velocity of toluol into PET are slow down after being annealed below Tg,an endothermic peak is appeared on the DSC curve with the increase of Tg,its initial modulus and yield stress increase while the sonic modulus keeps unchanged. All experimental results are explained by the assumption that the number of cohesional entanglements increases during physical aging.

采用密度、DSC、应力—应变测量、溶剂诱导结晶和声速测定等方法研究了物理老化对非晶态PET膜和纤维结构与性能的影响.研究结果表明,非晶态PET经物理老化后DSC曲线上的Tg增加,并出现吸热峰,热结晶变慢,溶剂诱导结晶和溶剂扩散速率变慢,初始模量和屈服应力增加,从物理老化引起PET中凝聚缠结增加这一结构变化的角度对上述实验现象进行了解释.

Effects of physical aging on the structure,mechanical and other properties of atactic polystyrene (a PS) films and fibers are studied by modulated differential scanning calorimetry(MDSC),density,solvent diffusing rate,stress strain behavior and sonic velocity measurements,and the corresponding observations are tentatively explained from the viewpoint of cohesional entanglements.It is shown that the glass transition temperature ( T g),relaxation enthalpy ( ΔH ) and its peak value ( T max )...

Effects of physical aging on the structure,mechanical and other properties of atactic polystyrene (a PS) films and fibers are studied by modulated differential scanning calorimetry(MDSC),density,solvent diffusing rate,stress strain behavior and sonic velocity measurements,and the corresponding observations are tentatively explained from the viewpoint of cohesional entanglements.It is shown that the glass transition temperature ( T g),relaxation enthalpy ( ΔH ) and its peak value ( T max ) in the MDSC curves,as well as the initial modulus ( E ),yield strength ( σ y ) and strength at break ( σ b ) all rise with the increase of physical aging time.On the other hand,the solvent diffusing rate slows down after being annealed below its T g,while the sonic velocity and density nearly keep unchanged.The weak interaction(i.e. cohesional entanglements) introduced by the physical aging is similar to van der Waals' force from its physical characteristic.All experimental results are interpreted by the assumption that the number of cohesional entanglements increase during physical aging.

用调幅式DSC等新技术研究了物理老化对无规聚苯乙烯多种性能的影响.随着老化时间的延长,试样的玻璃化转变温度、热焓松弛、峰温、峰高和热焓提高;老化使材料的初始模量,屈服应力和断裂强度都有不同程度的提高;使样品的溶剂扩散速率降低,但对样品的密度和声传播速度几乎没有影响.以上这些结果可从物理老化引起试样中凝聚缠结增加的观点来进行解释.

The structure changes of the industrial yarn of poly(ethylene terephthalate)(PET)of 1455dTex/110f under the tension of 0\^3N and at the temperature range of 375~494K were characterized by WAXD, density gradient method, sonic velocity measurements,and DSC.The shrinkage could be divided into two different processes characterized by different relaxation times and final shrinkage amounts.The molecular mechanism for the first process, the fast and dominant one, mainly was the disorientation of the extended...

The structure changes of the industrial yarn of poly(ethylene terephthalate)(PET)of 1455dTex/110f under the tension of 0\^3N and at the temperature range of 375~494K were characterized by WAXD, density gradient method, sonic velocity measurements,and DSC.The shrinkage could be divided into two different processes characterized by different relaxation times and final shrinkage amounts.The molecular mechanism for the first process, the fast and dominant one, mainly was the disorientation of the extended segments in the amorphous region, which can be proved by the change of orientation function of the amorphous region( f am )with shrinkage time at different temperatures. More meaningful thing is that the shape and change tendencies of f am and relative length ( l \-t) with shrinkage time are very similar. The second slow one was resulted from the restructuring of the crystalline region, which included the rapid growth of the crystallites, the formation of new imperfect crystals and the reorganization of existed crystals during the whole shriknage process. The changes of crystalline regions became fast with the temperature rising and consequently their effect of restriction of the disorientation of the amorphous region became more obvious. However, the orientation function of crystalline regions keeps unchanged almost during the thermal shrinkage process. It should be indicated that the structure changes of amorphous and crystalline regions are not independently. Each process proceeds and competes each other during the thermal shriknage.The contribution of both processes to the shrinkage mainly depends on the temperature and time.The study of structure change of PET yarn during thermal shrinkage provides an important idea of developing more perfect crystalline regions to limit the thermal shrinkage due to the disorientation in amorphous regions.PET yarns with strength of 7cN/dTex,modulus of 4\^4cN/dTex at 5% elongation and thermal shrinkage of 3\^5% have been successfully obtained.

采用广角X 射线衍射、密度梯度、声速和差示扫描量热等实验方法对 145 5dtex/ 110f成品涤纶工业丝等温收缩的结构变化进行了表征 ,外加张力为 0 3N ,测定温度范围 375~ 494K .结果表明 ,涤纶工业丝的热收缩在宏观上表现为速率不同的两个过程 ,对应两种不同机理 .其中快过程对应非晶区的解取向 ,对收缩的贡献是主要的 ;慢过程对应晶区的变化 ,包含了晶粒的增长 ,新的不完善晶粒的形成和晶区的完善 .晶粒的增长在较短的时间内基本完成 ,再结晶则存在于整个收缩过程 .随温度的升高 ,晶区变化速度明显加快 ,对非晶区解取向的抑制效应因此变大 .

 
图标索引 相关查询

 


 
CNKI小工具
在英文学术搜索中查有关sonic velocity measurement的内容
在知识搜索中查有关sonic velocity measurement的内容
在数字搜索中查有关sonic velocity measurement的内容
在概念知识元中查有关sonic velocity measurement的内容
在学术趋势中查有关sonic velocity measurement的内容
 
 

CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社