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The Oregon City-class was a class of heavy cruisers of the United States Navy. Although ten ships of this class were planned, only four were completed – one of those as a command ship. The three ships completed as cruisers were in commission from 1946 to 1980, one having been converted to a guided missile cruiser (CG).
Pressure-fed rocket cycle. Propellant tanks are pressurized to directly supply fuel and oxidizer to the engine, eliminating the need for turbopumps. The pressure-fed engine is a class of rocket engine designs. A separate gas supply, usually helium, pressurizes the propellant tanks to force fuel and oxidizer to the combustion chamber. To ...
The sternwheeler M.V. Columbia Gorge, built in 1983, was one of the first replica steamboats built for tourism purposes in Oregon. Since the early 1980s, several non-steam-powered sternwheel riverboats have been built and operated on major waterways in the U.S. state of Oregon, primarily the Willamette and Columbia Rivers, as river cruise ships used for tourism.
Helium is the smallest and the lightest noble gas and one of the most unreactive elements, so it was commonly considered that helium compounds cannot exist at all, or at least under normal conditions. [1] Helium's first ionization energy of 24.57 eV is the highest of any element. [2]
Helium is a commonly used carrier gas for gas chromatography. The age of rocks and minerals that contain uranium and thorium can be estimated by measuring the level of helium with a process known as helium dating. [28] [30] Helium at low temperatures is used in cryogenics and in certain cryogenic applications.
River cruise ships with accommodation facilities offer longer cruises. According to Douglas Ward, "A river cruise represents life in the slow lane, sailing along at a gentle pace, soaking up the scenery, with plentiful opportunities to explore riverside towns and cities en route. It is a supremely calming experience, an antidote to the pressures of life in a fast-paced wor
The cruise line prompts its “personal, caring service” with a crew from 41 countries speaking more than 52 languages. With 11 different ships, you can visit just anywhere in Europe the rivers ...
Overview of Oregon river drainage basins. This is a partial listing of rivers in the state of Oregon, United States.This list of Oregon rivers is organized alphabetically and by tributary structure.
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