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汽轮机叶片的微动现象
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作者 孔润祥 周祥英 《上海汽轮机》 1990年第4期51-58,共8页
本文主要应用微动磨损的一些基本概念,简述了汽轮机叶片断裂事故中的微动现象。并介绍了汽轮机叶片常用的1Cr13,2Cr13,15Cr11MoV三种材料微动疲劳性能的试验研究。
关键词 蒸汽透平 叶片 微动现象
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Off型感受野研究及在红外图像处理中的应用 被引量:4
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作者 王立 张科 李言俊 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 2003年第3期186-190,共5页
论证了感受野 (RF)学说和侧抑制 (LI)理论的本质一致性 .引入医学领域眼球微动现象 ,在视觉瞬间 ,指出物象斑将不可避免地交替出现在On型感受野 (On centerRF)和Off型感受野 (Off centerRF)之间 ,据此提出了新的视觉机理假说 .描述了Of... 论证了感受野 (RF)学说和侧抑制 (LI)理论的本质一致性 .引入医学领域眼球微动现象 ,在视觉瞬间 ,指出物象斑将不可避免地交替出现在On型感受野 (On centerRF)和Off型感受野 (Off centerRF)之间 ,据此提出了新的视觉机理假说 .描述了Off型感受野的特征 ,并建立描述Off型感受野的数学模型 .基于此模型探讨了新的边缘检测算法 ,应用于军事红外图像处理 。 展开更多
关键词 Off型感受野 侧抑制 眼球微动现象 红外图像处理 On型感受野 边缘提取 仿生学
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Characterization of dynamic microstructural evolution of AA7150 aluminum alloy at high strain rate during hot deformation 被引量:4
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作者 蒋福林 张辉 +1 位作者 翁舒楚 傅定发 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第1期51-62,共12页
The AA7150 aluminum alloy was compressed to various strains at strain rate of 10 s(-1) and temperatures of 300 °C and 450 °C, respectively. Flow stress behavior, substructure evolution, morphology and spat... The AA7150 aluminum alloy was compressed to various strains at strain rate of 10 s(-1) and temperatures of 300 °C and 450 °C, respectively. Flow stress behavior, substructure evolution, morphology and spatial distribution of precipitates were studied based on differential scanning calorimetry analysis and transmission electron microscope observation. The results showed that dynamic flow softening occurs during hot deformation. The main softening mechanism could be concluded as dynamic recovery at 300 °C and continuous dynamic recrystallization at 450 °C. The clear heterogeneous spatial distributions of precipitates are found during deformation and enhanced with increased strain. Higher contents of Cu in T phases are found at 450 °C than at 300 °C, which present a transformation process from T phases to S phases as well. The associated evidence of dynamic precipitation on dislocations and particle-stimulated nucleation, as well as the detailed microstructural inherited relationship and morphological texture(particles preferred orientation) were characterized. 展开更多
关键词 Al-Zn-Mg alloy hot compression dynamic phenomena MICROSTRUCTURE
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Nonperturbative Aspects of Axial Vector Vertex
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作者 ZONGHong-Shi CHANGChao-Hsi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2002年第4期461-464,共4页
It is shown how the axial vector current of current quarks is related to that of constituent quarks within the framework of the global color symmetry model.Gluon dressing of the axial vector vertex and the quark self-... It is shown how the axial vector current of current quarks is related to that of constituent quarks within the framework of the global color symmetry model.Gluon dressing of the axial vector vertex and the quark self-energy functions are described by the inhomogeneous Bethe-Salpeter equation in the ladder approximation and the Schwinger Dyson equation in the rainbow approximation,respectively. 展开更多
关键词 nonperturbative QCD constituent quark spontaneous chiral symmetry breaking
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A control model for hysteresis based on microscopic polarization mechanisms in piezoelectric actuator
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作者 汝长海 孙立宁 荣伟彬 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第3期302-306,共5页
Aiming at the limitation of control accuracy caused by hysteresis and creep for a piezoelectric actuator, the hysteresis phenomenon is explained based on the microscopic polarization mechanism and domain wall theory. ... Aiming at the limitation of control accuracy caused by hysteresis and creep for a piezoelectric actuator, the hysteresis phenomenon is explained based on the microscopic polarization mechanism and domain wall theory. Then a control model based on polarization is established, which can reduce the hysteresis and creep remarkablely. The experimental results show that the polarization control method is with more linearity and less hysteresis compared with the voltage control method. 展开更多
关键词 piezoelectric actuator HYSTERESIS microscopic polarization charge control
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Entrance Effects in Microchannel Gas Flow
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作者 T.Lewandowski S.Jebauer +1 位作者 J.Czerwinska P.Doerffer 《Journal of Thermal Science》 SCIE EI CAS CSCD 2009年第4期345-352,共8页
Motivation of this work has its origin in the boundary layer control for aeronautics and turbomachinery. For thatpurpose boundary layer can be modified by perforated plates with holes of specific sizes. The questions ... Motivation of this work has its origin in the boundary layer control for aeronautics and turbomachinery. For thatpurpose boundary layer can be modified by perforated plates with holes of specific sizes. The questions whichrise in such configuration are related to the existence of optimal size of the holes and the influence of microscalephenomena on the global flow patterns. This paper concentrates on the issue of the entrance effects on the microchannelflow. It is shown that mass flow rate is only insignificantly influenced by slip effects. Global parameterssuch as pressure difference and geometrical shape in more pronounced way alter flow behavior. In this paper weconcentrate on the numerical investigation of the microchannel flow for Kn < 0.01 and Re < 500. The channellength is finite. Hence, entrance and outlet effects on microchannel flow can be studied. 展开更多
关键词 perforated plates microchanneis gas flow simulations
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