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The Boeing 747 is a large, long-range wide-body airliner designed and manufactured by Boeing Commercial Airplanes in the United States between 1968 and 2023. After introducing the 707 in October 1958, Pan Am wanted a jet 2+1⁄2 times its size, to reduce its seat cost by 30%. In 1965, Joe Sutter left the 737 development program to design the 747. In April 1966, Pan Am ordered 25 Boeing 747-100 aircraft, and in late 1966, Pratt & Whitney agreed to develop the JT9D engine, a high-bypass turbofan. On September 30, 1968, the first 747 was rolled out of the custom-built Everett Plant, the world's largest building by volume. The first flight took place on February 9, 1969, and the 747 was certified in December of that year. It entered service with Pan Am on January 22, 1970. The 747 was the first airplane called a "Jumbo Jet" as the first wide-body airliner.
In descriptive statistics, the interquartile range (IQR) is a measure of statistical dispersion, which is the spread of the data. The IQR may also be called the midspread, middle 50%, fourth spread, or H‑spread. It is defined as the difference between the 75th and 25th percentiles of the data. To calculate the IQR, the data set is divided into quartiles, or four rank-ordered even parts via linear interpolation. These quartiles are denoted by Q1 (also called the lower quartile), Q2 (the median), and Q3 (also called the upper quartile). The lower quartile corresponds with the 25th percentile and the upper quartile corresponds with the 75th percentile, so IQR = Q3 − Q1.
A lynx is any of the four extant species within the medium-sized wild cat genus Lynx. The name originated in Middle English via Latin from the Greek word lynx (λύγξ), derived from the Indo-European root leuk-, in reference to the luminescence of its reflective eyes.
A buffer solution is a solution where the pH does not change significantly on dilution or if an acid or base is added at constant temperature. Its pH changes very little when a small amount of strong acid or base is added to it. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications. In nature, there are many living systems that use buffering for pH regulation. For example, the bicarbonate buffering system is used to regulate the pH of blood, and bicarbonate also acts as a buffer in the ocean.
The Sierra Nevada is a mountain range in the Western United States, between the Central Valley of California and the Great Basin. The vast majority of the range lies in the state of California, although the Carson Range spur lies primarily in Nevada. The Sierra Nevada is part of the American Cordillera, an almost continuous chain of mountain ranges that forms the western "backbone" of the Americas.
The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as many of those in the North Cascades, and the notable volcanoes known as the High Cascades. The small part of the range in British Columbia is referred to as the Canadian Cascades or, locally, as the Cascade Mountains. The highest peak in the range is Mount Rainier in Washington at 14,411 feet (4,392 m).
The cougar, also known as the puma, mountain lion, catamount, or panther, is a large cat native to the Americas, second in size only to the stockier jaguar. Its range spans the Canadian Territory of the Yukon, Provinces British Columbia and Alberta, the Rocky Mountains, and other areas in the Western United States. Their range extends further south through Mexico, where they are found in nearly every state, to the Amazon Rainforest and the southern Andes Mountains in Patagonia. The puma inhabits every mainland country in Central and South America, making it the most widely distributed large, wild, terrestrial mammal in the Western Hemisphere, and one of the most widespread on planet Earth. It is an adaptable, generalist species, occurring in most American habitat types. It prefers habitats with dense underbrush and rocky areas for stalking but also lives in open areas.
Rio Blanco County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 6,529. The county seat is Meeker. The name of the county is the Spanish name for the White River which runs through it.
Jackson County is a county located in the U.S. state of Colorado. As of the 2020 census, the population was 1,379, and it was the fourth least populated in the state. The county is named after the United States President Andrew Jackson. The county seat and only municipality in the county is Walden.
A savanna or savannah is a mixed woodland-grassland ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach the ground to support an unbroken herbaceous layer consisting primarily of grasses. According to Britannica, there exists four savanna forms; savanna woodland where trees and shrubs form a light canopy, tree savanna with scattered trees and shrubs, shrub savanna with distributed shrubs, and grass savanna where trees and shrubs are mostly nonexistent.
The Black Rock Desert is a semi-arid region of lava beds and playa, or alkali flats, situated in the Black Rock Desert–High Rock Canyon Emigrant Trails National Conservation Area, a silt playa 100 miles (160 km) north of Reno, Nevada that encompasses more than 300,000 acres (120,000 ha) of land and contains more than 120 miles (200 km) of historic trails. It is in the northern Nevada section of the Great Basin with a lakebed that is a dry remnant of Pleistocene Lake Lahontan.
A smoothbore weapon is one that has a barrel without rifling. Smoothbores range from handheld firearms to powerful tank guns and large artillery mortars.
The Walther WA 2000 is a semi-automatic bullpup sniper rifle produced by the Carl Walther GmbH Sportwaffen company from 1982 until 1988. It was produced in three different calibers. Production of the rifle was limited and it was shortly stopped because it was too expensive to achieve widespread sales and not robust enough for military use as a sniper rifle. Only 176 were built due to its high cost, making it one of the rarest and most sought production firearms ever made. The Bundeswehr Museum of German Defense Technology in Koblenz has one of this specimen in its collection.
The third generation of the BMW 3 Series range of compact executive cars is designated under the model code E36, and was produced by the German automaker BMW from 1990 to 2000. The initial models were of the four-door sedan body style, followed by the coupé, convertible, wagon ("Touring"), and eventually hatchback ("Compact").
The Dassault Falcon 900, commonly abbreviated as the F900, is a French-built corporate trijet aircraft made by Dassault Aviation.
The Taigan, and also known as Kyrgyz Taighany, Mongolian Taiga dog is a breed of sighthound from Kyrgyzstan. The Taigan is found in the alpine Tian Shan region of Kyrgyzstan on the border with China, it is closely related to the Tazy and the Saluki.
The Cessna Citation V is a business jet built by Cessna that was in production from 1989 until 2011. During that time, 774 such craft were made. The first Model 560 prototype, a stretched version of the Citation S/II, flew in August 1987 and was certified on December 9, 1988.
The Indian subcontinent is a physiographical region in Southern Asia, mostly situated on the Indian Plate, projecting southwards into the Indian Ocean from the Himalayas. Geopolitically, it spans major landmasses from the countries of Bangladesh, Bhutan, India, the Maldives, Nepal, Pakistan, and Sri Lanka. Although the terms "Indian subcontinent" and "South Asia" are often used interchangeably to denote the region, the geopolitical term of South Asia frequently includes Afghanistan, which is not considered part of the subcontinent.
An operating temperature is the allowable temperature range of the local ambient environment at which an electrical or mechanical device operates. The device will operate effectively within a specified temperature range which varies based on the device function and application context, and ranges from the minimum operating temperature to the maximum operating temperature. Outside this range of safe operating temperatures the device may fail.
References
- Wise, David (2000). The New Illustrated Encyclopedia of Automobiles (May 2000 Rev. Upd. ed.). BookSales Inc. ISBN 0-7858-1106-0.[ page needed ]
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