Within the limits of accuracy of the experiment , positron spin-flipping seems to happen at the same frequency as electron spin-flipping .
在实验精度可以达到的范围内,正电子的自旋反转似乎与电子的自旋反转发生在同一微波频率上。
Functional magnetic resonance imaging ( fmri ) or positron emission tomography ( pet ) monitor blood flow .
功能磁共振成像(fmri)或正电子发射断层扫描(pet)可以检测血流量。
Within the limits of accuracy of the experiment , positron spin-flipping seems to happen at the same frequency as electron spin-flipping . No asymmetry there , then .
在实验可达到的准确度范围内,由于正电子自旋翻转与电子自旋翻转发生的频率相同,所以不存在不对称。
To the electron , the corresponding system is the positron , which was observed after the prediction in cosmic ray experiments by anderson in 1932 .
对电子来说,与其相对应的是正电子,后者被安德森于1932年在宇宙射线实验中发现。
This creates , as it were , electron and positron shadows .
这样也就有了电子和正电子的阴影。
Dr balaban 's team devised experiments in which brain activity in unhatched chick embryos was monitored using an advanced pet ( positron emission tomography ) scanning technique .
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。
These techniques include magnetic resonance imaging ( mri ) , positron emission tomography ( pet ) , and functional magnetic resonance imaging ( fmri ) .
这些技术包括磁共振成像(mri),正电子成象术(pet)机能性磁共振成像(fmri)。
One way to create such short bursts of gamma rays is through the collision -- and subsequent annihilation , as the mass of those particles converts into energy -- of an electron and a positron .
制造伽马射线短脉冲的一种方法,是电子与正电子的碰撞之后的湮灭,使粒子的质量转化为能量。
She used positron emission tomography ( pet ) to measure brain activity in six fundamentalist christians and six non-religious ( though not atheist ) controls .