Jet aircraft

A jet aircraft (or simply jet) is an aircraft (nearly always a fixed-wing aircraft) propelled by jet engines (jet propulsion).

Whereas the engines in propeller-powered aircraft generally achieve their maximum efficiency at much lower speeds and altitudes, jet engines and aircraft achieve maximum efficiency (see specific impulse) at speeds close to or even well above the speed of sound. Jet aircraft generally cruise at faster than about M 0.8 (609 mph, 981 km/h or 273 m/s) at altitudes around 10,000–15,000 metres (33,000–49,000 ft) or more.

Frank Whittle, an English inventor and RAF officer, developed the concept of the jet engine in 1928,Hans von Ohain in Germany, a decade later developed the concept independently at the end of the 1930s. He wrote in February 1936 to Ernst Heinkel, telling him of the design and its possibilities. However, it can be argued that the English engineer A. A. Griffith, who published a paper in July 1926 on compressors and turbines, also deserves credit.

Uzbekistan Airways

OJSC National Air Company Uzbekistan Airways, operating as Uzbekistan Airways (Uzbek: 'Ўзбекистон Ҳаво Йўллари', O‛zbekiston Havo Yo‛llari; Russian: Узбекские Авиалинии), is the national airline of Uzbekistan, headquartered in Tashkent. From its hub in Tashkent International Airport, the airline serves a number of domestic destinations; the company also flies international services to Asia, Europe and North America.

History

Following the dissolution of the Soviet Union, Uzbek President Islam Karimov in 1992 authorised the creation of Uzbekistan Airways. The carrier was established on 28 January 1992, and took over the operations of the Uzbekistan division of Aeroflot on 31 May 1992. The airline's maiden flight was from Tashkent to London.

Domestic flights used Russian-built aircraft that formerly belonged to Aeroflot. When international routes were prioritised, Airbus planes were leased, starting in 1993.

Uzbekistan Airways Technics provides technical services for Il-76, Il-62, An-2 and Yak-42 aircraft, and aircraft engines Аn-25, Тa-6А and Тa-8, also A, B, C, D and IL checks on the Boeing 767, Boeing 757, Airbus 310, Airbus 320 and RJ-85.

Uzbekistan

Coordinates: 41°N 69°E / 41°N 69°E / 41; 69

Uzbekistan (US ⁱ/ʊz.ˈbɛk.ɪ.ˌstæn/, UK /ʊz.ˌbɛk.ɪ.ˈstɑːn/), officially the Republic of Uzbekistan (Uzbek: Oʻzbekiston Respublikasi/Ўзбекистон Республикаси), is a doubly landlocked country in Central Asia. It is a unitary, constitutional, presidential republic, comprising 12 provinces, 1 autonomous republic, and 1 capital city. Uzbekistan is bordered by five countries: Kazakhstan to the north; Tajikistan to the southeast; Kyrgyzstan to the northeast; Afghanistan to the south; and Turkmenistan to the southwest.

Once part of the Turkic Khaganate and later Timurid Empires, the region that today includes the Republic of Uzbekistan was conquered in the early 16th century by Eastern Turkic-speaking nomads. The area was gradually incorporated into the Russian Empire during the 19th century, and in 1924 what is now Uzbekistan became a bordered constituent republic of the Soviet Union, known as the Uzbek Soviet Socialist Republic (Uzbek SSR). Following the breakup of the Soviet Union, it declared independence as the Republic of Uzbekistan on 31 August 1991 (officially celebrated the following day).

Central Asia

Central Asia is the core region of the Asian continent and stretches from the Caspian Sea in the west to China in the east and from Afghanistan in the south to Russia in the north. It is also sometimes referred to as Middle Asia, and, colloquially, "the 'stans" (as the six countries generally considered to be within the region all have names ending with the Persian suffix "-stan", meaning "land of") and is within the scope of the wider Eurasian continent.

In modern contexts, all definitions of Central Asia include these five republics of the former Soviet Union: Kazakhstan (pop. 17 million), Kyrgyzstan (5.7 million), Tajikistan (8.0 million), Turkmenistan (5.2 million), and Uzbekistan (30 million), for a total population of about 66 million as of 2013–2014. Afghanistan (pop. 31.1 million) is also sometimes included.

Various definitions of Central Asia's exact composition exist, and not one definition is universally accepted. Despite this uncertainty in defining borders, the region does have some important overall characteristics. For one, Central Asia has historically been closely tied to its nomadic peoples and the Silk Road. As a result, it has acted as a crossroads for the movement of people, goods, and ideas between Europe, Western Asia, South Asia, and East Asia.

Tashkent

Tashkent (/ˌtæʃˈkɛnt/; Uzbek: Toshkent, Тошкент [tɒʃˈkent]; Russian: Ташкент, [tɐʂˈkʲɛnt]; literally "Stone City") is the capital and largest city of Uzbekistan. The officially registered population of the city in 2012 was about 2,309,300.

Due to its position in Central Asia, Tashkent came under Sogdian and Turkic influence early in its history, before Islam in the 8th century AD. After its destruction by Genghis Khan in 1219, the city was rebuilt and profited from the Silk Road. In 1865 it was conquered by the Russian Empire, and in Soviet times witnessed major growth and demographic changes due to forced deportations from throughout the Soviet Union. Today, as the capital of an independent Uzbekistan, Tashkent retains a multi-ethnic population with ethnic Uzbeks as the majority.

History

During its long history, Tashkent has had various changes in names and political and religious affiliations.

Early history

Tashkent was settled by ancient people as an oasis on the Chirchik River, near the foothills of the West Tian Shan Mountains. In ancient times, this area contained Beitian, probably the summer "capital" of the Kangju confederacy.