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In the quantum mechanical treatment, the electron in a ground state hydrogen atom has no angular momentum at all—illustrating how the "planetary orbit" differs from electron motion. May be a hypercorrection formed by analogy with the names of the other letters of the alphabet, most of which include the sound they represent. This article is about the letter of the alphabet. Be the first to know about our newest arrivals, special offers and store events near you. A successive Hirsch-type-index for institutions has also been devised.
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The modern majuscule H is derived directly from the Latin. The cursive Latin form resembled a stylized version of the modern minuscule h, as did the uncial form. Both of these forms result from writing the letter without taking the pen from the paper, the right-hand vertical bar being thus foreshortened and the horizontal stroke rounded.
Efforts have also been undertaken with genetically modified alga in a bioreactor. Is lighter than air, having only 7% of the density of air, it was once widely used as a lifting gas in balloons and airships. Liquid hydrogen and liquid oxygen together serve as cryogenic fuel in liquid-propellant rockets, as in the Space Shuttle main engines. Hydrogen is employed to saturate broken ("dangling") bonds of amorphous silicon and amorphous carbon that helps stabilizing material properties.
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The h-index can be manipulated through self-citations, and if based on Google Scholar output, then even computer-generated documents can be used for that purpose, e.g. using SCIgen. The h-index does not account for the typical number of citations in different fields. Citation behavior in general is affected by field-dependent factors, which may invalidate comparisons not only across disciplines but even within different fields of research of one discipline. The h-index discards the information contained in author placement in the authors' list, which in some scientific fields is significant though in others it is not.
Brought understanding of the nature of the chemical bond, which followed shortly after the quantum mechanical treatment of the hydrogen atom had been developed in the mid-1920s. Ion, known as protonated molecular hydrogen or the trihydrogen cation. In inorganic chemistry, hydrides can also serve as bridging ligands that link two metal centers in a coordination complex.
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Navy's Navigation technology satellite-2 (NTS-2). For example, the ISS, Mars Odyssey and the Mars Global Surveyor are equipped with nickel-hydrogen batteries. In the dark part of its orbit, the Hubble Space Telescope is also powered by nickel-hydrogen batteries, which were finally replaced in May 2009, more than 19 years after launch and 13 years beyond their design life.
Browse dictionary: Letter "H"
In the Haber process for the production of ammonia, hydrogen is generated from natural gas. Electrolysis of brine to yield chlorine also produces hydrogen as a co-product. The electrolysis of water is a simple method of producing hydrogen.
It is also a potential electron donor in various oxide materials, including ZnO, SnO2, CdO, MgO, ZrO2, HfO2, La2O3, Y2O3, TiO2, SrTiO3, LaAlO3, SiO2, Al2O3, ZrSiO4, HfSiO4, and SrZrO3. Elemental hydrogen has been widely discussed in the context of energy, as a possible future carrier of energy on an economy-wide scale. Hydrogen is a ''carrier'' of energy rather than an energy resource, because there is no naturally occurring source of hydrogen in useful quantities.
