Gateway Arch

There are transition metals in many of the products that people use in daily life. Some of these metals have obvious roles, such as the coin metals of gold, silver, and copper. Iron, which makes up 90% of all metal that is refined, or purified for use, is found in everything from tools to paper staples to washing machines. The most important iron product is steel, an iron-based metal alloy. Most steel made for manufacturing purposes is iron alloyed with the element carbon, which makes the steel much harder than iron alone. Several other transition metals are alloyed with iron to make different kinds of steel for different uses. Vanadium, niobium, molybdenum, manganese, chromium, and nickel are all used in steel alloys. For instance, chromium and nickel are alloyed with iron to create stainless steel, a type of steel that does not rust and is used in surgical instruments, cookware, and tools. Some famous landmarks such as the top of the Chrysler skyscraper in New York City and the St. Louis Gateway Arch are covered in stainless steel. 

Symmetry typically prompts interest in an object and often endows it with beauty. The Gateway Arch in St. Louis, Missouri, poised on the western bank of the Mississippi River, has both symmetry and beauty. Its triangular cross-section is large at the... 

St. Louis has been dubbed The Gateway to the West as symbolized by the 630-foot-high Gateway Arch that hovers over the Mississippi River. The city also has strong ties to the South with its powerful grassroots blues scene. 

Another well-known tower, the Washington Monument, was completed in 1884. At 555 feet in height, it was the world s tallest tower until the Eiffel Tower, nearly 1,000 feet tail, was completed in 1889. The Washington Monument remains the world s tallest masonry structure. The Gateway Arch in St. Louis, Missouri, is the tallest monument in the United States, at 630 feet... 

The first design for the Gateway Arch in St. Louis, Missouri, had a fatal flaw that made it unstable at the required height. The final design used 886 tons of stainless steel, making it a very expensive structure. 

Ginsburg, A. Peterkofsky, A. Enzyme I The gateway to the bacterial phos-phoenolpyruvate sugar phosphotransferase system. Arch. Biochem. Bio-phys., 397, 273-278 (2002)... 

Outdoor enthusiasts are relocating in droves to the slick little town of Moab, which is the gateway to Arches and Canyonlands national parks. Rock climbers and mountain bikers are putting these two gorgeous parks on the map fast. 

Caterary arch = a sprung arch in the shape of an inverted catenary curve, used in early refractory brick kilns and the St. Louis arch, Gateway to the West. ... 

Structures other than bridges are often subjects for potential Strouhal-Karman difficulties. These include high smokestacks and tall buildings. The St. Louis Arch (the Gateway to the West) was questioned from this point of view. Model tests and calculations performed by den Hartog at MIT revealed that the arch would be in trouble at wind velocities of 60 10 mph when the wind blows from due north or south 5°. As a matter of safety, the arch has been instrumented to monitor its vibration and people are not allowed to go up into the arch if the wind velocity exceeds 40 mph. 

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