正电子

In this paper, using Doppler broadening positron annihilation technique investigates the effect of multiple implanting and oxygen concentration variation during.

通过多普勒增宽正电子湮没测试，不同剂量和能量注入、退火后的样品其顶层Si中的氧相关缺陷有着不同的性质。

Fist of all, an advanced positron annihilation coincidence Doppler broadening system was designed and developed and a peak to background ratio of 3.6×10~6 was obtained.

首先我们设计研制了一套高性能的正电子湮没符合多普勒测量系统，其峰谷比可达到3.6×10~6。

The result of positron lifetime and Doppler broadening measurements is used to discriminate the native defects in p-type GaAs and InP with different growth technique and carrier concentration.

用正电子寿命及多普勒展宽测量来鉴别不同载流子，不同生长方法生长的p型GaAs和InP中的本征缺陷。

As an auxiliary experiment, the variations in M〓ssbauer parameters and Doppler broadening lineshape parameter S of positron annihilation with annealing temperature have also been investigated.

作为辅助实验，我们还考查了近零磁致伸缩非晶态合金的Mossbauer参量和正电子湮没的Doppler展宽线型参数随退火温度的变化。

In this paper the internal microdefects of single crystals of〔Ca_3(VO_4)_2〕were studied by Doppler broadening S parameter and positronlifetimes under different growth conditions and different physical treats.

本文用正电子湮没 Doppler 展宽 S 参数和寿命，研究了在不同生长条件下和经过不同物理条件处理的正钒酸钙〔Ca_3(VO_4)_2〕晶体内部的微观缺陷。

In present work, the coincidence Doppler broadening spectra of positron annihilation radiation of NiTi, NiAl alloys, single crystal of Si, and pure metals, such as Fe, Co, Al, Nb, Cu, Ni, Ti have been measured.

利用正电子寿命谱参数研究了NiTi合金马氏体转变及其奥氏体转变过程中的微观缺陷和电子密度的变化，从而揭示NiTi合金马氏体转变的微观机制。

Positron annihilation lifetime and coincidence Doppler broadening measurements have also been performed on alloying TiAl. The experiments results indicate that the effect on the electron structure of TiAl alloy is different when different amounts of Nb are doped.

2利用符合多普勒展宽与正电子湮没寿命测量方法，分析讨论了不同含量Nb对Ti–49Al合金的掺杂效应，研究结果表明：不同含量Nb掺杂对TiAl合金的电子结构影响是不同的，从而导致了对合金性能的不同影响。

Single detector and coincidence Doppler broadening measurements using slow positron beam were carried out to study Ti/Al multilayer films. The main goal is to study the evolution of vacancy-type defects and inter-diffusion of elements in films subjected to different annealing conditions.

4符合多普勒展宽测量结合慢正电子束流研究了磁控溅射方法制备的Ti/Al多层膜，分析讨论了多层膜缺陷结构的热稳定性，实验结果表明，随退火温度的升高，点缺陷结构经历了迁移、聚集长大最后崩塌回复过程。

Examples are charged particle beams , an electron cloud in a Penning trap , and positron plasmas.

例子是带电粒子光束，一个电子云在潘宁陷阱，和正电子等离子体。

CP violating effects in top quark pair production at electron and positron colliders have been widely studied.

电子正电子对撞产生top对过程中的CP破坏效应已经被广泛的研究了。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。