positron

An Approach to Positron Emission Tomography Based on Penalized Cross-Entropy Minimization

基于惩罚交叉熵极小的正电子放射成像技术

This was confirmed by the positron annihilation technique.

正电子湮没技术证实了这种空位的存在.

Scatter coincident events are the important factor that affects the quality of positron emission tomography ( PET ) images.

散射事件是影响正电子发射断层扫描术 ( Positronemissiontomography,PET ) 图像重建质量的一个重要因素.

Positron emission tomography ( PET ) is an imaging technique that combines a radioactive tracer with a molecule.

正电子发射断层成像 ( PET ) 是一种结合单一分子放射示踪的成像技术.

The electron, for example, has negative charge, whilst its antiparticle, called the positron, has positive charge.

举例说明, 比如电子带负电荷, 同时, 它的反粒子被称作正电子—带有正电荷.

You can read more about Positron by viewing the Positron Company Profile.

正电子信息您可以通过查看阅读更多关于正电子正电子公司简介.

The compressor control of cryogenics system in Beijing Electron-Positron Collider Upgrade ( BEPCII) superconductive radio frequency cavity ( SRF Cavities) will affects directly the performance of the refrigerator, the working stability of the SRF cavities and the power consumption of the compressor.

在BEPCII超导腔低温系统中，压缩机控制的优劣直接关系到制冷机制冷性能的高低、压缩机耗能的多少以及超导腔能否稳定运行。

This is the mathematical basis of computed tomography and positron emission tomography.

这是计算机层析成像和正电子层析成像的数学基础.

Optical-model Approach for Positronium Formation in Positron Scattering from H and Na Atoms

光学势方法研究正电子与H，Na碰撞中电子偶素形成通道

At the same time, we also carried out the momentum space coupled channels optical method ( CCO) for the positron scattering from hydrogen at low energies, the total cross section was reproduced and compared with other theoretical methods.

同时用光学势方法来表示电子偶素通道和电离通道的作用，我们实施耦合通道光学势方法研究了正电子与氢原子低能碰撞，主截面被报道了而且也与其他理论进行了比较。

How few cancer cells can be detected positron emission tomography?

正电子发射断层摄影怎样探测少量癌症细胞?

The positron is an antielectron.

正电子就是反电子.

In the country" long march on the2nd," strap-on rockets, nuclear submarines and electron-positron collider, there are Yueqing components produced.

在国家“长征二号”捆绑式火箭、核潜艇和正负电子对撞机中，都有乐清生产的配件。

Molecular imaging with positron emission tomography ( PET ) is an important field of molecular imaging.

正电子发射断层 ( PET ) 分子影像学是分子影像学的重要内容.

The vacancy defects of samples were measured by slow positron annihilation.

借助慢正电子湮没技术研究了样品的空位型缺陷.

Partial volume effect ( PVE) and their influence factors for positron emission tomography ( PET) were investigated with computer simulation and experiments.

用模拟实验研究了正电子发射断层扫描（PET）部分容积效应与相关影响因素间的关系。

Objective : To discuss the nursing countermeasure for receiving high quality Positron Emission Tomography ( PET ) image.

目的: 探讨 正电子 发射 计算机断层 显像检查中的护理方法.

Magnetized water samples were measured by the positron annihilation lifetime spectrometer.

用正电子湮没寿命谱仪对经过磁场处理的水样品进行了对照测量.

The study of the bond type in MgH_2 and A1H_3 by positron annihilation

用正电子湮灭技术对MgH2和AlH3键型的探讨

Beijing Electron Positron Collider ( BEPC) is the State Key lab of our country in high physics research.

北京正负电子对撞机（BEPC）是用于高能物理研究的国家重点实验室。

The Harvard group use positron emission tomography ( PET ) scans to monitor the brain activity.

哈佛大学的研究组运用正电子发射X射线 层析照相术 ( PET ) 监测大脑的活动.

Objective To evaluate the value of high energy positron imaging in the diagnosis of colon neoplasm.

目的评估高能正电子成像技术在结肠肿瘤诊断中的临床实用价值.

Present calculation results show that ionization continuum and positronium formation channels play an important role in positron-potassium scattering.

计算结果表明，电离和正负电子偶素的形成在正电子和钾原子碰撞散射体系中起著重要的作用。

Studies of electrophysiological positron emission tomography and patients have provided important evidence supporting this viewpoint.

电生理研究、成像研究以及病人研究都为这一观点提供了可靠的证据.

These new tests are resonance imaging ( MRI ) and positron emission tomography ( PET ) scanning of the heart.

这两个检查项目分别称为核磁共振 ( MRI ) 和正电子发射断层显像 ( PET ) .

A Study of a Thermally Cycled Cu-based Alloy by Positron Annihilation

Cu基合金冷热循环的正电子湮没研究

For instance, the antimatter opposite of an electron, known as a positron, is positively charged.

例如，电子的反物质就是带正电的质子。

Research on Effect of Acupuncture at Sanyinjiao on Brain Function by Means of Positron Emission Tomographic Imaging

针刺三阴交的PET脑功能研究

The antielectron, or positron, was discovered in 1932.

反电子或正电子, 是在1932年被发现.

Photons lost energy in the process of interaction with other particles, in addition to the photoelectric effect, Compton effect, another effect is the electron-positron pair production.

光子在和物质相互作用的过程中失去能量，除了发生光电效应和康普顿效应外，还有一种就是电子对生成的过程。