| 词汇 | positron |
| 释义 | positron noun[ C ] physics specializeduk /ˈpɒz.ɪ.trɒn/ us /ˈpɑː.zɪ.trɑːn/ an extremely small piece of matter with a positive electrical charge, having the same mass as an electron正电子，阳电子 Electricity & electronics anodize anti-static arc bitstream brownout capacitance chargeable electricity generate high-voltage homing linesman magnet multimeter negatively non-electric non-electrical non-electronic solid-state transistorized You can also find related words, phrases, and synonyms in the topics: Physics: atoms, molecules & sub-atomic particles positron | American Dictionarypositron noun[ C ] us/ˈpɑz·ɪˌtrɑn/ physics a very small piece of matter with a positive electrical charge, and with the same size as an electron Examples of positronpositron Following their emission, positrons travel for a short distance that is defined by their energy and the surrounding tissue. This effect decreases when the number of positrons increases. When using carbon, however, the carbon 11 isotopes produced by fragmentation are positron emitters. Planning and spatial working memory : a positron emission tomography study in humans. Their spatial patterns are significantly modified by the presence of the positron component. It is seen that an addition of minute quantities of positrons abruptly reduces the net negative charge of the dust grain. After an encounter with a shock wave, some positrons are reflected and then accelerated along the magnetic field. Further, we find that some particles in another positron bunch are accelerated by the parallel electric field. The resulting bremsstrahlung cascade in the solid target produces high energy bremsstrahlung, positron-electron pairs, and photonuclear reactions in the target material. The generation of hard bremsstrahlung, photonuclear reactions, and preliminary evidence for positron-electron pair production will be discussed. Changes in regional brain glucose metabolism measured with positron emission tomography after paroxetine treatment of major depression. Abnormalities in brain glucose metabolism were examined using functional neuroimaging with positron emission tomography. Recalling word lists reveals ' cognitive dysmetria ' in schizophrenia : a positron emission tomography study. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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