mass number

noun

1. （原子）质量数
   the total number of protons and neutrons in an atom

1. A radioactive isotope of strontium ( with the mass number 90) that is present in the fallout from nuclear explosions; can be assimilated like calcium into bones.
   锶的放射性同位素（原子质量数为），存在于核爆炸的原子尘中，能象钙一样被吸收到骨中。
2. But the company says it has reached a critical mass in terms of number of screens and in the last two months has been running advertising campaigns for McDonald's and Eli Lilly.
   但该公司表示，它的广告屏数量已经突破临界点，而且在过去两个月中，该公司一直在为麦当劳（McDonald's）和礼来公司（EliLilly）进行广告宣传。
3. And, I mean literally, mass, not mole number.
   我想罗嗦一下，质量，而不是摩尔数。
4. This be that one passage cannot that wait till forever mass a number!
   不要回头，时代总会变化！这是一段永远等不到的集结号！
5. Search the site to find in-depth information for the mass number of animals present all over the world.
   搜寻网站上找到大规模的动物数量目前在世界各地的深度信息。
6. A radioactive isotope of cobalt with mass number 60; a source of exceptionally intense gamma rays; used in radiation therapy.
   具有放射性的钴的同位素，原子质量数为，一种能量极高的伽马放射源，用于放射疗法。
7. Total mass divided by the number of moles is the molecular weight.
   总质量除以，摩尔数就等于分子量。
8. And for the web, developers are providing mass and the number of deployed browsers providing velocity.
   对于web来说，开发者已经开发部署了大量的应用。
9. We find that, in halos of fixed mass, the number of satellite galaxies has a strong dependence on the halo age, with fewer satellites in older halos.
   通过研究半解析和流体动力学两种星系形成模型，我们发现，暗物质晕中的星系分布对晕的形成时间也有强烈的依赖性。
10. Computer make quadrupole mass spectrometer can choose enlarge rate of different ion mass number and different ion flow according to the need of reality, carry on the alternative scanning, thus reach to the request that test effectively and fast to different quality and different sensitivity.
    另外计算机还能对四极质谱计按实际需要选择不同的离子质量数和不同的离子流放大倍率，进行选择性的扫描，从而达到对不同质量和不同灵敏度的快速有效地实时测试的要求。
11. Such current disturbs the zero out-put basic line of the light mass number region, so that it's very difficult to measure and record the height of spectrum peaks of the light mass number region.
    这种电子流对轻质量部分质谱的零输出基线起干扰作用，致使这部分谱峰的峰高不能很好地测量和记录。
12. Microcomputer controlled ion mass number monitoring and locking
    微机控制离子质量数监控与锁定装置的研制
13. A boundary layer numerical solution was used for the computation of combustion in hybrid rocket motor according to the boundary burning theory. Various value of mass transfer number and the oxidizer mass flux were considered in the calculation.
    针对固液混合火箭发动机典型的边界层燃烧理论，用边界层的方法对固液混合火箭发动机燃烧进行了计算，计算采用二维轴对称的层流边界层方程，化学模型采用有限速率模型。
14. In mass media, a number of religion words are used surpassing their original literal meaning.
    在大众传媒语言中宗教词语并没有局限在其原始意义上，而是突破了自身“狭窄”的使用范围，大量地进入社会生活中。
15. The Threefold Fragmentation of Hot Nuclei With Medium Mass Number
    中等质量热核三重碎裂
16. The mass number dependence and the neutron incident energy dependence of the radiative capture cross sections from various reaction mechanisms of the neutron radiative capture process have been examined in the nuclear mass region A < 100.Two reaction mechanisms are considered.
    对A<100核质量区内的核素，研究中子辐射俘获反应中不同反应机制对辐射俘获截面的贡献随靶核质量数和中子入射能量变化的规律。
17. Wet weight of fat, fat/ body mass, adipocyte number and size.
    脂肪湿质量，脂/体比，脂肪细胞数和脂肪细胞的大小。
18. The action of optical direct-reading techniques in environment monitoring was described, with analysis of relationship between atmospheric aerosol mass concentration distribution and number distribution by multiple regressions.
    介绍了光学测量技术在环境监测中的应用，利用多元回归方法分析了大气气溶胶数密度和质量浓度的相关性。
19. Dependence of phase transition on the mass number of hot nuclei
    热核破碎中相变现象的质量依赖性
20. The analyze mass number is from 1 to 80.The system design reasonably operate simply.
    分析质量数为1～80。
21. The microscopic mechanism of the identical odd and even mass number nuclear bands in normally deformed rare earth nuclei was investigated using the particle number conserving ( PNC) method for treating nuclear pairing correlation.
    用处理对力的粒子数守恒方法分析了稀土区正常变形奇核-偶核全同带的物理机制。
22. Effective Mass and Mean Number of Optical Phonon of Weak-coupling Polaron in a Parabolic Quantum Wire
    抛物量子线中弱耦合极化子的有效质量和光学声子平均数
23. For the mass number of web pages needed to be crawled, how the information crawling system gets more web pages with good quality effectively, is related to the system performance.
    信息采集系统需要采集的页面数量非常浩大，如何有效地采集到高质量的网页关乎系统性能。
24. The rock mass contains a large number of initial defects, including holes, pores, microcracks, and joints, etc., the existence of initial defects increase the level of water-rock contact and change the mechanics and deformation characteristics of rock mass.
    岩体中含有大量的初始缺陷，包括空隙、孔隙、微裂纹、节理等，初始缺陷的存在增加了水与岩体接触的程度，改变了岩体的力学和变形特性。
25. We have investigated in details the properties of the or Pb and Ni isotopes, and found that the energies and widths of the resonant states decrease with the increasing of the nuclear mass number for the two chains.
    最后系统地研究了Pb和Ni这两条同位素链的共振态性质，发现两条同位素链的单粒子共振态能量都随原子核质量数的增加而减小。
26. Semantic search technique, fortunately, is a hopeful way that leads to the key to the issue of finding exact information from mass number of them effectively.
    如何在海量的信息中有效地找到所需信息因而成为了一个关键问题，语义检索技术是解决这一问题非常有潜力的方法。
27. Higher education in China has entered the era of mass, the number of university students continues to increase, the scale of the college is also growing, colleges and universities are paid more and more attention.
    我国高等教育已经步入了大众化时代，高校人数在不断的增加，高校的规模也越来越大，高校越来越受到社会的高度重视。

noun

1. the sum of the number of neutrons and protons in an atomic nucleus

   Synonym:    nucleon number