1) ultrashort pulsed X-ray
超短脉冲X射线
1.
The development of an ultrashort pulsed X-ray facility for fluorescent lifetime measurement;
超短脉冲X射线激发荧光寿命谱仪的设计与研制
2) pulsed x ray
脉冲X射线
1.
In this paper is given briefly a survey of situation of simulating pulsed x ray with high current pulsed electron beam accelerator.
文章简要介绍了利用强流脉冲电子束加速器模拟脉冲X射线的发展概况及国内脉冲X射线模拟源的发展现状 ,指出作为主要技术途径 ,高功率Z箍缩技术在实现超强脉冲X射线源和ICF驱动源上都有很重要的发展应用前景 ,并提出了今后工作设
3) pulsed X-ray
脉冲X射线
1.
Design of portable-pulsed X-ray imaging system;
便携式脉冲X射线成像系统研究
2.
To meet the needs of research on new fast scintillation materials,the home-made pulsed X-ray facility for fluorescents lifetime measurement was upgraded by using microchannel plate photomultiplier tube(MCP-PMT),fast preamplifier(FPA)and fast constant-fraction discriminator(CFD).
为适应新型超快闪烁材料研究的需要,在原有脉冲X射线时间谱仪的基础上,通过改装微通道板光电倍增管(MCP-PMT),并采用具有快时间响应的前置放大器(FPA)和恒比甄别器(CFD)的方法,使谱仪的时间分辨极限提高到170ps左右。
3.
The blow-off impulse of aluminum induced by pulsed X-ray was simulated by smoothed particle hydrodynamics(SPH) method,and the influence of sublimation energy on impulse was discussed.
采用光滑粒子流体动力学方法对金属铝在脉冲X射线辐照下的汽化反冲冲量进行了数值模拟,考察了升华能的变化对冲量的影响。
4) X-ray pulsar
X射线脉冲星
1.
Research on detectors in X-ray pulsars-based navigation system;
基于X射线脉冲星导航系统探测器研究
2.
Use of X-ray pulsar-based navigation method on interplanetary trajectory
X射线脉冲星导航在行星际轨道上的应用
3.
The research on X-ray pulsar navigation and positioning technology
X射线脉冲星导航定位技术研究
5) X-ray pulsars
X射线脉冲星
1.
The Research of the Navigation of Spacecraft Based on the X-Ray Pulsars;
基于X射线脉冲星的航天器自主导航方法研究
2.
For reducing the computation complexity of pulse period ambiguity resolution for X-ray Pulsars NAVigation (XPNAV) and improving its convenience in engineering implementation, the Optimization Model for 4 X-ray pulsars localization is presented based on the orthogonality principle.
为降低X射线脉冲星导航定位(XPNAV)系统解脉冲周期模糊的复杂度,提高其工程实用性,该文提出一种新的XPNAV系统解脉冲周期模糊算法。
3.
In this paper, firstly,the algorithms of autonomous navigation based on X-Ray pulsars are introduced;secondly the model of the extended Kalman filter which is used in the autonomous navigation based on X-Ray pulsars is established;thirdly,taking the geosynchronous orbit for example,the accuracy of naviga- tion with different initial error,differe.
基于X射线脉冲星的天文自主导航方法稳定、可靠、精度高,是航天器自主导航领域重要的发展方向。
6) pulsed soft X-ray
脉冲软X射线
1.
The blowoff impulse in materials radiated by the pulsed soft X-ray on Qiangguang-Ⅰ accelerater was measured by using an impulse equipment in which the target-pendulum moves in the rotational way.
采用靶摆旋转运动式冲量探头,在“强光一号”加速器上,测量了脉冲软X射线辐射材料产生的喷射冲量。
补充资料:超短脉冲激光频率转换材料
超短脉冲激光频率转换材料
materials for ultrashort pulses laser frequency conversion
超短脉冲激光频率转换材料materials forultrashort Pulses laser frequeney eonversion用于脉冲宽度从微微秒直到几十毫微微秒激光的频率转换材料。超短脉冲激光具有短的脉宽,较好的模式特性以及高的峰值功率,从而具有很强的非线性性能。经频率转换后,短波的超短脉冲可产生强的光化学反应,是探索微观世界和超高速现象的极为有用的光源。此外,采用薄片倍频材料的超短脉冲倍频,可以作为超短脉冲脉宽测量的一种简便有效的方法,在技术上有实用价值。 对超短脉冲激光频率转换材料的性能主要有以下要求:①高的光损伤闭值。由于超短脉冲的高峰值功率,因而对材料的光损伤阑值提出高的要求,一般要大于GW/cmZ。②相位匹配特性。超短脉冲在空间的尺度短到毫米及几百微米量级,短脉冲波包在材料中以群速度传播。因而,除一般的相速度匹配外,还应满足群速度匹配才能获得较高的能量转换效率。对光学均匀材料,要求基频和倍频波的折射率色散小,才能获得较好的群速度匹配。对I类匹配,群速度要求稍低;对n类匹配要求太苛刻,很难应用。由于群速度失配存在,一般器件只取亚毫米的厚度。过长的光程于能量转换无补,反而引入脉宽的展宽以及能量的损耗。③透过波段。首先要求对参与频率转换的激光波长有高的透过率。对超短脉冲应用场合,材料应有更短的紫外吸收边。其原因是吸收边会增加材料的折射率色散;远离使用波长的吸收边,可使材料获得较好的群速度匹配。 钱激光超短脉冲频率转换的常用材料是磷酸二氢钾(KDP)类晶体。此外,新开发的三硼酸锉(LBO)晶体,由于其高的抗光损伤阑值、好的紫外透过率以及小的色散,也是好的超短脉冲频率转换用材料。有机晶体精氨酸磷酸盐(LAP)和氛化精氨酸磷酸盐(D一LAP)也可用作超短脉冲频率转换用材料。 (邵宗书)
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条