两项最新伽马射线天空图的观测研究表明如果此种神秘物质是粒子，则要大约是一个质子质量的44倍，比400亿电子伏还重。
Two new looks at the gamma-ray sky suggest that if the mysterious matter is a particle, it is heavier than 40 gigaelectronvolts, about 44 times the mass of a proton.
给定元素的所有同位素都含有相同的质子数，但它们的中子数不同，因此它们的原子质量也不同。
All the isotopes of a given element have the same number of protons, but differ in their number of neutrons, and hence in their atomic mass.
每一个中子或者质子的质量都是一个电子的两千倍。
Each proton (or neutron) has about two thousand times the mass of an electron.
而这是一个很大的困扰，因为质子的质量与电子相距甚远。
And that was a great worry because the protons have a very different mass from the electrons.
而随着宇宙的进一步冷却，这些质子与中子便有能力团聚一起并组成质量最小元素中的核子，这些元素即氢、氦与锂。
When it had cooled further, these protons and neutrons were able to get together to form the nuclei of the lightest elements-hydrogen, helium and lithium.
大概等于质子的质量。
而且我认为人们也会开始考虑，像电子的质量对质子的质量的比值，也许其他无量纲的常数也在发生变化。
And I think people would start looking to see, well, maybe other dimensionless ratios like the ratio of the mass of the electron to the mass of the proton are changing.
这意味着，现在我们对反质子对电子的质量测量精度几乎与测量正质子一样。
It means that our measurement of the antiproton's mass relative to the electron is now almost as accurate as that of the proton.
在我们的宇宙中，底夸克的质量大约是顶夸克的两倍，造成中子比质子重大约0.1%。
In our universe, the down quark is about twice as heavy as the up quark, resulting in neutrons that are 0.1 percent heavier than protons.
到目前为止，大型强子对撞机将质子-反质子对撞机设置的质量限制扩大了两倍，以高达约700千兆电子伏的能量规模高速运作也未能找到任何超夸克的存在。
So far the LHC has doubled the mass limit set by the Tevatron, showing no evidence of squarks at energies up to about 700 gigaelectronvolts.
由于质子与中子的质量大约相等(并且电子几乎没有质量)，氦原子的质量大约应是氢原子质量的四倍。
Because protons and neutrons have roughly the same mass (and electrons have almost no mass), the helium atom should have about four times the mass of the hydrogen atom.
所有基本粒子如质子和电子都有其对应的反物质。它们的质量相同，电荷相反。
All elementary particles, such as protons and electrons, have antimatter counterparts with the same mass but the opposite charge.
在APS中，它是没问题去讨论质子的质量是否随著时间变化，以及多宇宙如何作为，但全球变暖的证据是无可辩驳的？
In the APS it is ok to discuss whether the mass of the proton changes over time and how a multi-universe behaves, but the evidence of global warming is incontrovertible?
质子辐照后，硅橡胶的质量有所损失，其质损率随辐照能量和剂量的增加而增加；
There was mass loss of silicon rubber after proton radiation and the mass loss percent increased with the increase of irradiation fluence.
为什么电子比质子或中子活动更大？这是因为电子质量轻，结合力弱的缘故。
Why are electrons more mobile than protons or neutrons? It is BE cause they have lighter mass and less firm binding.
例如，质子的质量比电子的质量重1836倍。
The mass of proton, e. g. , is 1836 times heavier than the electron mass .
配合谱仪进行了自旋回波脉冲序列的成象实验，获得了较高质量的质子密度图像。
The imaging experiment of spin-echo pulse-sequence was accomplished and images of good quality were obtained by using the homemade NMR micro-imaging system.
由于质子与电子的质量比很大，能量平衡时间比粒子间碰撞时间长。
The energy equipartition time is longer than the interparticle collision time by the mass ratio of proton and electron.
例如，质子的质量比电子的质量重1836倍。
The mass of proton , e. g. , is 1836 times heavier than the electron mass .
中子的质量略大于质子的质量。
中子的质量略大于质子的质量。
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