positron
美 [?pɑz?trɑn] 
英 [?p?z?tr?n]
- n.正電子；陽電子
- 網絡正子；反電子；正子電腦斷層掃描
詞形變化
復數：positrons
英漢雙解
1. | 正電子；陽電子a particle in an atom which has the same mass as an electron and an equal but positive charge |
英漢解釋
英英解釋
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.
這樣，正常電子的反粒子叫做正（陽）電子，如同它有一個陽電荷一樣，但是與電子的質量一樣。
Some of these gamma rays pass near atomic nuclei, in the process transforming into an electron and a positron, researchers said.
某些伽馬射線在靠近原子核的附近經過，進入到轉化為個電子和正電子的過程，研究人員說。
For instance, the antimatter opposite of an electron, known as a positron, is positively charged.
例如，電子的反物質就是帶正電的質子。
Total cross sections for positron scattering on potassium were calculated at low energies by means of the coupled channels-optical method.
應用耦合通道光學勢方法計算低能正電子同鉀原子碰撞的總散射截面。
Next the antiatoms encounter a strong electric field that strips apart the antiproton and positron of the weakly bound antiatoms .
接著，反原子會遇到一個強電場，把束縛松散的反原子里的反質子及正子給拆開。
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.
只有當1932年與電子相反的兄弟，正電子，在宇宙射線中被發現的時候，才證明這種物質的確存在。
An atom of antihydrogen, for instance, is composed of a negatively-charged antiproton being orbited by a positively-charged positron.
舉例來說，一個反氫原子，由帶正電荷的正電子圍繞帶負電荷軌道運行的反質子組成。
From earlier results using much less data, the positron cloud seemed to be spherical and centred on the centre of the galaxy.
從使用較少數據的早期結果來看，正電子云似乎是呈球狀位于銀河中心。
Blackett was really the first to obtain hard evidence for the existence of a positron but he was afraid to publish it.
布萊克特幾乎是第一個發現正電子存在的有力證據的人，但他卻沒敢發表這個結果。
A positron is an anti-electron, a mirror-image particle with the same properties as an electron, but an opposite, positive charge.
一個正電子則是一個反電子，即與一個電子有相同屬性的鏡象粒子，只是其電荷性質相反即帶正電荷。
By means of positron annihilation lifetime spectra (PALS), the free volume of polymer could be tested.
通過正電子湮沒壽命譜技術（PALS）探測聚合物的自由體積特性，能夠了解聚合物的微觀性質。
Positron Emission Tomography Study of Regional Cerebral Metabolism during General Anesthesia with Xenon in Humans.
氙氣全身麻醉時對于人類局部區域腦代謝的正電子掃描圖像研究。
Positron emission tomography, or PET, is nuclear cardiac imaging for optimally assessing blood flow in the heart.
正電子發射體層攝影術，或寵物，是核心臟成像，為最大限度地評估血流在心里。
Attenuation correction in positron emission tomography (PET) is an essential part of clinical and research studies.
衰減校正在正電子發射斷層掃描技術（PET）是一個重要組成部分的臨床和研究。
The antihydrogen atoms are composed of a positron (an antimatter electron) orbiting an antiproton nucleus.
反氫原子是正電子（所謂正電子就是反物質的電子）圍繞著以反質子為核心，作軌道運行所形成。
Some radioactive substances emit positrons, the antiparticles to electrons, and are used in PET (positron-emission tomography) scans.
有些放射性物質會放出正子，它是電子的反粒子，已經應用于正子斷層掃描（PET）。
Positron emission tomography (PET) is a molecular imaging technique with particularly broad application in drug discovery and development.
正電子發射斷層掃描技術（PET）是一種分子成像技術，特別是廣泛應用在藥物發現和開發。
An infected vascular graft was identified using a combined positron emission tomography (PET) and computerized tomography (CT) system.
受感染的血管被確定使用結合正電子發射斷層掃描技術（PET）和計算機斷層掃描（CT）系統。
PET, or positron emission tomography, is an imaging study that allows doctors to evaluate the use of certain substances by the brain.
即正電子放射斷層攝影術，是一項成像研究，它能使醫生評價大腦對某些物質的使用。
Positron and electron (particle and anti-particle) can annihilate in collision turning into electromagnetic radiation.
正電子和電子（粒子和反粒子）在對撞中會發生湮滅，并產生電磁輻射。
Objective To summarize the key points of nursing patients with malignant tumor undergoing positron emission tomography (PET)-CT imaging.
目的總結腫瘤患者應用18F-氟代脫氧葡萄糖（18F-FDG）進行PET-CT顯像檢查的護理要點。
Objective: To discuss the nursing countermeasure for receiving high quality Positron Emission Tomography (PET) image.
目的：探討正電子發射計算機斷層顯像檢查中的護理方法。
Both rely on mathematical calculations to determine the location from which a positron or photon was emitted.
這兩種成像方法均依靠精確的計算來決定正電子或光于發射的位置。
This creates, as it were, electron and positron shadows.
這將產生電子和正電子的陰影帶，正如月亮陰影帶本身。
Increasing attention has been focused on synthesis radiopharmaceuticals for positron emission tomography (PET).
正電子放射性藥物的合成是核技術應用領域的焦點之一。
This was confirmed by the positron annihilation technique.
正電子湮沒技術證實了這種空位的存在。
Positron emission computed tomography (PET) is the golden standard for evaluation of myocardial viability.
在核素心肌灌注顯像中，正電子發射型計算機體層顯像是評價存活心肌的金標準。
This phenomenon occurs whenever the interaction is so strong as to cause transitions from electron states to positron states.
這一現象發生在相互作用如此強因此致使從（負）電子態到正電子態轉變的任何時候。
An experiment in the late '90s managed to generate from a vacuum gamma photons and an occasional electron-positron pair.
上世紀九十年代下旬的一次實驗試圖從真空產生伽馬光子以及偶電子-正電子對。
The key of this technology depended on increasing batteries positron electrode -- zincous -- the electron that can carry.
這項技術的重點在于增加了電池正電子電極——陽極——所能攜帶的電子。
To participate in annihilation, as do an electron and a positron.
粒子與反粒子的湮滅，就好比電子遇上正電子。
Building the positron production system and aiming the nanometer-size beams at the collision point will be demanding tasks.
而建造產生正子的系統，以及將奈米大小的射束瞄準碰撞點，將會是最嚴苛的任務。
One signature of positron-electron annihilation is gamma rays carrying 511 thousand electron-volts (keV) of energy.
電子-正電子湮滅的一個信號就是攜帶511keV能量的伽瑪射線。
Later, electron and positron pairs were actually produced in laboratory experiments.
之后，電子與正電子對也最終在實驗室中被制造出來。
It was a very difficult first step to accept the positron.
接受正電子是艱難的第一步。
after an immeasurably short time interval , the electron - positron pair recombine.
電子正電子偶經過一個不可測量的短暫時間間隔后就重新復合。
A 52-year-old man underwent 18F-FDG positron emission tomography (FDG PET) scan as part of a physical check-up.
一位52歲的男性接受葡萄糖正子斷層掃描作為健康檢查的其中一個項目。
The samples were also analyzed by slow positron implantation spectroscopy (SPIS).
同時還使用了慢正電子注入譜來分析樣品的微結構。
In this study, we imaged VEGFR expression with positron emission tomography (PET) to non invasively analyze post stroke angiogenesis.
在這項研究中，我們用PET顯影血管內皮生長因子受體的表達，以非侵襲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.
一個可以安裝兩個斯特恩-格拉赫裝置在雙方的靈活的角度對根據電子對梁。
