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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 ...
Roaring River (South Fork McKenzie River) Rogue River (Oregon) Rogue River (South Yamhill River) Row River; Salmon River (Clackamas County, Oregon) Salmon River (Lincoln County, Oregon) Salmonberry River; Salt Creek (Middle Fork Willamette River) Sandy River; Santiam River; Scoggins Creek; Shitepoke Creek; Shitten Creek; Siletz River; Siltcoos ...
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.
It carries Oregon Route 43 over the river at about RM 26 (RK 42) between Oregon City and West Linn. [102] [103] The Ross Island Bridge carries U.S. Route 26 (Mount Hood Highway) over the river at RM 14 (RK 23). It is one of 10 highway bridges crossing the river in Portland. The 3,700-foot (1,100 m) bridge is the only cantilevered deck truss in ...
Aerial view of crossings in downtown Portland. This is a list of bridges and other crossings of the Willamette River in the U.S. state of Oregon from the Columbia River upstream to the confluence of the Middle Fork Willamette River and Coast Fork Willamette River.
Hydreliox is an exotic breathing gas mixture of hydrogen, helium, and oxygen. [1] [2] For the Hydra VIII (Hydra 8) mission at 50 atmospheres of ambient pressure, the mixture used was 49% hydrogen, 50.2% helium, and 0.8% oxygen. [3] It is used primarily for research and scientific deep diving, usually below 130 metres (430 ft).
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]
In the natural condition of the river, Portland was the farthest point on the river where the water was deep enough to allow ocean-going ships. Rapids further upstream at Clackamas were a hazard to navigation, and all river traffic had to portage around Willamette Falls, where Oregon City had been established as the first major town inland from Astoria.
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