An H II region is a region of interstellar atomic hydrogen that is ionized. [1] . It is typically in a molecular cloud of partially ionized gas in which star formation has recently taken place, with a …

HII is a driving force behind the protection of computer systems, networks and platforms, with offensive and defensive cyber capabilities. With broad experience in rapid prototyping, …

Huntington Ingalls Industries, Inc. (HII) is the largest military shipbuilding company in the United States as well as a provider of professional services to partners in government and industry. …

H II region, interstellar matter consisting of ionized hydrogen atoms. The energy that is responsible for ionizing and heating the hydrogen in an emission nebula comes from a central …

In this project you will follow the footsteps of Hubble, Bowen, and Zanstra in particular, to determine certain ionic abundances in H II regions. From this you will determine the effective …

An HI region or H I region (read H one) is a cloud in the interstellar medium composed of neutral atomic hydrogen (HI), in addition to the local abundance of helium and other elements. (H is …

HII regions are emission nebulae created when young, massive stars ionise nearby gas clouds with high-energy UV radiation. They are composed primarily of hydrogen, hence the name …

在天文里，HI, HII 分别是中性氢、电离氢的意思。H就是Hydrogen，I, II表示中性原子、第一电离态原子，以此类推也适用于其他类元素以及III, IV... 等状态。 星系里的HI一般认为是恒星形成 …

Such regions of ionized hydrogen are called HII regions, while cold un-ionized hydrogen clouds are termed HI regions (with the I and II referring to the ionization state of the hydrogen). As we …

HHI指数，也称赫希曼-赫芬达尔指数， 是一种测量产业集中度的综合指数，以用来反应市场规模的离散度与集中度，是经济学界和政府管制部门使用较多的指标，其公式为： HHI = \sum_ …