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  2. List of Star Trek aliens - Wikipedia

    en.wikipedia.org/wiki/List_of_Star_Trek_aliens

    The Hirogen are a violent Delta quadrant species encountered by the USS Voyager. The Hirogen culture is based around hunting other sentient species, whom they regard as "prey." They are humanoid but larger than humans. [15] Reception. In 2017, ScreenRant ranked the Hirogen the 10th most bizarre aliens in the Star Trek franchise up to that time ...

  3. Star Trek: Voyager - Wikipedia

    en.wikipedia.org/wiki/Star_Trek:_Voyager

    An artistic rendition of the Milky Way galaxy, overlaid with the fictional quadrant system of the Star Trek universe and the location of certain species. Voyager had to make its way from above where the Kazon species is located back to Earth; this journey is a major plot element in the series

  4. Hydrogen safety - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_safety

    All four of these factors are considered during the initial design of a system using hydrogen, and is typically accomplished by limiting the contact between susceptible metals and hydrogen, either by spacing, electroplating, surface cleaning, material choice, and quality assurance during manufacturing, welding, and installation.

  5. Dharma Initiative - Wikipedia

    en.wikipedia.org/wiki/Dharma_Initiative

    DHARMA-Houses. The Dharma Initiative and its origins are first explored in the episode "Orientation" by an orientation film in the Swan Station.Dr. Pierre Chang (Francois Chau), under the alias of Dr. Marvin Candle, explains that the project began in 1970, created by two doctoral candidates from the University of Michigan, Gerald and Karen DeGroot (Michael Gilday and Courtney Lavigne), and was ...

  6. Hydrogen technologies - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_technologies

    Hydrogen technologies are technologies that relate to the production and use of hydrogen as a part hydrogen economy. Hydrogen technologies are applicable for many uses.. Some hydrogen technologies are carbon neutral and could have a role in preventing climate change and a possible future hydrogen economy.

  7. Fuel cell - Wikipedia

    en.wikipedia.org/wiki/Fuel_cell

    Demonstration model of a direct methanol fuel cell (black layered cube) in its enclosure Scheme of a proton-conducting fuel cell. A fuel cell is an electrochemical cell that converts the chemical energy of a fuel (often hydrogen) and an oxidizing agent (often oxygen) [1] into electricity through a pair of redox reactions. [2]

  8. Hydrogen storage - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_storage

    Compressed hydrogen is a storage form whereby hydrogen gas is kept under pressures to increase the storage density. Compressed hydrogen in hydrogen tanks at 350 bar (5,000 psi) and 700 bar (10,000 psi) are used for hydrogen tank systems in vehicles, based on type IV carbon-composite technology.

  9. List of lost inventions - Wikipedia

    en.wikipedia.org/wiki/List_of_lost_inventions

    This is a list of lost inventions - technologies whose original capabilities cannot be recreated in the same form anymore. It does not include theoretical inventions. It does not include theoretical inventions.