positron
美 [ˈpɑzətrɑn] 
英 [ˈpɒzɪtrɒn]
- n.正电子；阳电子
- 网络正子；反电子；正子电脑断层扫描
词形变化
复数：positrons
英汉双解
1. | 正电子；阳电子a particle in an atom which has the same mass as an electron and an equal but positive charge |
英汉解释
英英解释
例句
So, the antiparticle of the normal electron is called the positron, as it has a positive charge, but the same mass as the electron.
这样，正常电子的反粒子叫做正（阳）电子，如同它有一个阳电荷一样，但是与电子的质量一样。
Some of these gamma rays pass near atomic nuclei, in the process transforming into an electron and a positron, researchers said.
某些伽马射线在靠近原子核的附近经过，进入到转化为个电子和正电子的过程，研究人员说。
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。
Total cross sections for positron scattering on potassium were calculated at low energies by means of the coupled channels-optical method.
应用耦合通道光学势方法计算低能正电子同钾原子碰撞的总散射截面。
Next the antiatoms encounter a strong electric field that strips apart the antiproton and positron of the weakly bound antiatoms .
接著，反原子会遇到一个强电场，把束缚松散的反原子里的反质子及正子给拆开。
It was only in 1932, when the electron's antimatter sibling, the positron, was sighted in cosmic rays that such a thing was found to exist.
只有当1932年与电子相反的兄弟，正电子，在宇宙射线中被发现的时候，才证明这种物质的确存在。
An atom of antihydrogen, for instance, is composed of a negatively-charged antiproton being orbited by a positively-charged positron.
举例来说，一个反氢原子，由带正电荷的正电子围绕带负电荷轨道运行的反质子组成。
From earlier results using much less data, the positron cloud seemed to be spherical and centred on the centre of the galaxy.
从使用较少数据的早期结果来看，正电子云似乎是呈球状位于银河中心。
Blackett was really the first to obtain hard evidence for the existence of a positron but he was afraid to publish it.
布莱克特几乎是第一个发现正电子存在的有力证据的人，但他却没敢发表这个结果。
A positron is an anti-electron, a mirror-image particle with the same properties as an electron, but an opposite, positive charge.
一个正电子则是一个反电子，即与一个电子有相同属性的镜象粒子，只是其电荷性质相反即带正电荷。
By means of positron annihilation lifetime spectra (PALS), the free volume of polymer could be tested.
通过正电子湮没寿命谱技术（PALS）探测聚合物的自由体积特性，能够了解聚合物的微观性质。
Positron Emission Tomography Study of Regional Cerebral Metabolism during General Anesthesia with Xenon in Humans.
氙气全身麻醉时对于人类局部区域脑代谢的正电子扫描图像研究。
Positron emission tomography, or PET, is nuclear cardiac imaging for optimally assessing blood flow in the heart.
正电子发射体层摄影术，或宠物，是核心脏成像，为最大限度地评估血流在心里。
Attenuation correction in positron emission tomography (PET) is an essential part of clinical and research studies.
衰减校正在正电子发射断层扫描技术（PET）是一个重要组成部分的临床和研究。
The antihydrogen atoms are composed of a positron (an antimatter electron) orbiting an antiproton nucleus.
反氢原子是正电子（所谓正电子就是反物质的电子）围绕着以反质子为核心，作轨道运行所形成。
Some radioactive substances emit positrons, the antiparticles to electrons, and are used in PET (positron-emission tomography) scans.
有些放射性物质会放出正子，它是电子的反粒子，已经应用于正子断层扫描（PET）。
Positron emission tomography (PET) is a molecular imaging technique with particularly broad application in drug discovery and development.
正电子发射断层扫描技术（PET）是一种分子成像技术，特别是广泛应用在药物发现和开发。
An infected vascular graft was identified using a combined positron emission tomography (PET) and computerized tomography (CT) system.
受感染的血管被确定使用结合正电子发射断层扫描技术（PET）和计算机断层扫描（CT）系统。
PET, or positron emission tomography, is an imaging study that allows doctors to evaluate the use of certain substances by the brain.
即正电子放射断层摄影术，是一项成像研究，它能使医生评价大脑对某些物质的使用。
Positron and electron (particle and anti-particle) can annihilate in collision turning into electromagnetic radiation.
正电子和电子（粒子和反粒子）在对撞中会发生湮灭，并产生电磁辐射。
Objective To summarize the key points of nursing patients with malignant tumor undergoing positron emission tomography (PET)-CT imaging.
目的总结肿瘤患者应用18F-氟代脱氧葡萄糖（18F-FDG）进行PET-CT显像检查的护理要点。
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。
Both rely on mathematical calculations to determine the location from which a positron or photon was emitted.
这两种成像方法均依靠精确的计算来决定正电子或光于发射的位置。
This creates, as it were, electron and positron shadows.
这将产生电子和正电子的阴影带，正如月亮阴影带本身。
Increasing attention has been focused on synthesis radiopharmaceuticals for positron emission tomography (PET).
正电子放射性药物的合成是核技术应用领域的焦点之一。
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。
Positron emission computed tomography (PET) is the golden standard for evaluation of myocardial viability.
在核素心肌灌注显像中，正电子发射型计算机体层显像是评价存活心肌的金标准。
This phenomenon occurs whenever the interaction is so strong as to cause transitions from electron states to positron states.
这一现象发生在相互作用如此强因此致使从（负）电子态到正电子态转变的任何时候。
An experiment in the late '90s managed to generate from a vacuum gamma photons and an occasional electron-positron pair.
上世纪九十年代下旬的一次实验试图从真空产生伽马光子以及偶电子-正电子对。
The key of this technology depended on increasing batteries positron electrode -- zincous -- the electron that can carry.
这项技术的重点在于增加了电池正电子电极——阳极——所能携带的电子。
To participate in annihilation, as do an electron and a positron.
粒子与反粒子的湮灭，就好比电子遇上正电子。
Building the positron production system and aiming the nanometer-size beams at the collision point will be demanding tasks.
而建造产生正子的系统，以及将奈米大小的射束瞄准碰撞点，将会是最严苛的任务。
One signature of positron-electron annihilation is gamma rays carrying 511 thousand electron-volts (keV) of energy.
电子-正电子湮灭的一个信号就是携带511keV能量的伽玛射线。
Later, electron and positron pairs were actually produced in laboratory experiments.
之后，电子与正电子对也最终在实验室中被制造出来。
It was a very difficult first step to accept the positron.
接受正电子是艰难的第一步。
after an immeasurably short time interval , the electron - positron pair recombine.
电子正电子偶经过一个不可测量的短暂时间间隔后就重新复合。
A 52-year-old man underwent 18F-FDG positron emission tomography (FDG PET) scan as part of a physical check-up.
一位52岁的男性接受葡萄糖正子断层扫描作为健康检查的其中一个项目。
The samples were also analyzed by slow positron implantation spectroscopy (SPIS).
同时还使用了慢正电子注入谱来分析样品的微结构。
In this study, we imaged VEGFR expression with positron emission tomography (PET) to non invasively analyze post stroke angiogenesis.
在这项研究中，我们用PET显影血管内皮生长因子受体的表达，以非侵袭的方法分析卒中后血管生成。
One can install two Stern-Gerlach apparatuses at two sides with flexible angles with respect to according to the electron-positron beams.
一个可以安装两个斯特恩-格拉赫装置在双方的灵活的角度对根据电子对梁。
