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cross transition
相关语句
  相似匹配句对
     Transition Cross Sections in Two-Photon Process
     双光子过程中的跃迁截面(英文)
短句来源
     Cross-Platform Transition Technology Research and Application
     跨平台移植技术研究及应用
短句来源
     Cross Infection
     交叉感染
短句来源
     and transition phase.
     转变 ,并析出过渡相。
短句来源
     Connection and Transition
     联系与过渡
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  cross transition
The latter is characteristic for the compound and can in a simple way be interpreted as a cross transition.
      


The Pb(Mg_(1/3)Nb(2/3))_A(Mn_(1/3)Nb(2/3))_B Ti_CZr_DO_3(or PMMN)quaternary system piezoelectric ceramic material was investigated.A cross-transition position in rectangle phase diagram at room temperature was found. The basic composition PMMN-1 at this position shows excellent piezoelectric performance, temperature stability, low electromechanical loss and high mechanical strength. Adding with appropriate amount of CeO_2 and substituting Sr partly for Pb in PMMN ceramics, thetemperature characteristics...

The Pb(Mg_(1/3)Nb(2/3))_A(Mn_(1/3)Nb(2/3))_B Ti_CZr_DO_3(or PMMN)quaternary system piezoelectric ceramic material was investigated.A cross-transition position in rectangle phase diagram at room temperature was found. The basic composition PMMN-1 at this position shows excellent piezoelectric performance, temperature stability, low electromechanical loss and high mechanical strength. Adding with appropriate amount of CeO_2 and substituting Sr partly for Pb in PMMN ceramics, thetemperature characteristics would be improved further. Besides, Compared with binary and ternary piezoelectric ceramics, the PMMN quaternary system has good technological features, such as, property easily modified, low calcining and sintering temperature, sintering large range, low volatilization of PbO so that piezoelectric ceramic of high quality can be easily prepared.

通过对Pb(Mg_(1/3)Nb_(2/3))_A(Mn_(1/3)Nb_(2/3))_B Ti_cZr_DO_3(简称PMMN)四元系压电陶瓷材料的研究,发现在其室温矩形相图内存在一“交叉”性过渡位置,在此位置上的基本试样PMMN-1具有高压电性、低机电损耗、温度稳定性好、机械强度高等优点,是一种开发大功率压电变压器及其它压电器件的较佳材料。适量添加CeO_2和以Sr部分取代Pb,可较好地改善其温度稳定性。该材料与一般二、三元系压电材料相比,还具有性能易于调整,预烧温度与烧成温度低,烧结范围宽,PbO挥发量小,易于制备出均质的高性能压电陶瓷等工艺特点。

A solution doping technique of fabricating Er3+- Yb3+ Co-doped single-mode active fiber is reported. After ultraviolet irradiation, the fiber attenuation increases obviously at several absorption peaks, whereas the value in low absorption region remains almost no change. Several hundreds of ppm dopant concentration and dopant ratio of Yb3+ : Er3+ = 20 : 1 are found to be appropriate for device application. The cross-transition mechanism between energy levels of Er3+ and Yb3+ is investigated, through...

A solution doping technique of fabricating Er3+- Yb3+ Co-doped single-mode active fiber is reported. After ultraviolet irradiation, the fiber attenuation increases obviously at several absorption peaks, whereas the value in low absorption region remains almost no change. Several hundreds of ppm dopant concentration and dopant ratio of Yb3+ : Er3+ = 20 : 1 are found to be appropriate for device application. The cross-transition mechanism between energy levels of Er3+ and Yb3+ is investigated, through cross-relaxation between them, the pupping absorption band has been widened and the thermal stability has been enhanced.

报道了制造Er~3+—Yb~3+双掺单模有源光纤的溶液掺杂技术。此光纤经紫外辐照后吸收峰处损耗明显增加,而低损耗区损耗几乎不变。对激光器件应用而言,认为几百ppm浓度和yb~3+:Er~3+=20:1掺杂比是合适的。探讨了Er~3+和yb~3+能级间相互跃迁机理,通过二者的交叉驰豫提高了泵浦吸收带范围和热稳定性。

There are 93 families,269 genera and 763 species of woody plants in Quxian County of Zhejiang Province.The specles are very rich,geogra-phical elements of the flora are very complex,and there are more ancient families and genera in the flora.This flora has wide connection with wnrld flora and a typical subtropical character.The flora shows the cross transition of midle-subtropics from south to north and east to west.It takes East China elements as majority and has close relations to the floristic elements...

There are 93 families,269 genera and 763 species of woody plants in Quxian County of Zhejiang Province.The specles are very rich,geogra-phical elements of the flora are very complex,and there are more ancient families and genera in the flora.This flora has wide connection with wnrld flora and a typical subtropical character.The flora shows the cross transition of midle-subtropics from south to north and east to west.It takes East China elements as majority and has close relations to the floristic elements of Central china,South China, North China and Southwest China.

浙江衢县共有木本植物93科269属763种,种类丰富,地理成分复杂,含有许多古老的科属,与世界区系有广泛的联系,且具明显的亚热带性质。通过与周围山地植物区系比较,显示出该区系以华东植物区系成分为,主,华中、华南、华北及西南植物区系成分兼容并存,并显示出中亚热带从南到北和从东到西的交叉过渡。

 
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