positron造句
31. The electron, for example, has negative charge, whilst its antiparticle, called the positron, has positive charge.
32. Both rely on mathematical calculations to determine the location from which a positron or phot on was emitted.
33. The quality of the LM soap film crystal is determined by means of the positron annihilation life spectroscopy.
34. How few cancer cells can be detected positron emission tomography?
35. The high-voltage plateau curve, pulse amplitude distribution and efficiency curve were measured with electron and positron beams.
36. This is the mathematical basis of computed tomography and positron emission tomography.
37. As for the electron - positron collider, first I want to tell you a story.
38. Objective : To discuss the nursing countermeasure for receiving high quality Positron Emission Tomography ( PET ) image.
39. Partial volume effect(PVE) and their influence factors for positron emission tomography(PET) were investigated with computer simulation and experiments.
40. The TESLA positron injector linac with a L-band TW normal conducting structure has been studied, which offers both higher shunt impedance and larger aperture.
41. Studies of electrophysiological positron emission tomography and patients have provided important evidence supporting this viewpoint.
42. The stability of up - quenched Cu - 25 . 0 Zn - 4.20 Al ( wt . % ) alloy has been studied by positron annihilation and X - ray diffraction.
43. Molecular imaging with positron emission tomography ( PET ) is an important field of molecular imaging.
44. Scatter coincident events are the important factor that affects the quality of positron emission tomography ( PET ) images.
45. In this case, the telltale signal is gamma-rays at energies of 511,000 electron volts -- evidence that an electron/positron pair has annihilated.
46. Next the antiatoms encounter a strong electric field that strips apart the antiproton and positron of the weakly bound antiatoms.
47. Optical absorption spectra and positron annihilation radiation Doppler broadening were measured at room temperature.
48. Positron and electron (particle and anti-particle) can annihilate in collision turning into electromagnetic radiation.
49. An electron with a negative charge, as contrasted with a positron.
50. The vacancy - defect properties were measured by slow positron annihilation, and mechanical behaviors were studied using nanoindentation.
51. According to the values of the life time of positron annihilation, the model of positron annihilation in the rare-earth polyacetylene was proposed.
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