XRL WKT (26)
XRL may refer to: *Guangzhou–Shenzhen–Hong Kong Express Rail Link, a high-speed railway line connecting Beijing and Hong Kong *Hong Kong West Kowloon railway station, Hong Kong, Immigration Department station code XRL *X-ray laser, a device that uses stimulated emission (The acronym can refer to these in either in the general sense, or as a part of the Strategic Defense Initiative , Project Excalibur Project Excalibur was a Lawrence Livermore National Laboratory (LLNL) Cold Warera research program to develop an X-ray laser system as a ballistic missile defense (BMD) for the United States. The concept involved packing large numbers of expendab ...

Guangzhou–Shenzhen–Hong Kong Express Rail Link
Guangzhou–Shenzhen–Hong Kong Express Rail Link (XRL), also known as “Guangshengang XRL” (officially Beijing–Guangzhou–Shenzhen–Hong Kong high-speed railway, Guangzhou–Shenzhen–Hong Kong section), is a high-speed railway line that connects Beijing and Hong Kong ( Kowloon) via Guangzhou and Shenzhen. Three types of rolling stock that operate along the XRL: Hexie (Harmony) and Fuxing (Rejuvenation) operated by China Railway, and Vibrant Express by MTR Corporation. The first phase, Shenzhen North– Guangzhou South, commenced revenue operation in December 2011. Services were extended to the city centre of Shenzhen at Futian in December 2015. The final phase, which connects Shenzhen-Futian to Hong Kong (West Kowloon) was inaugurated on 22 September 2018. It opened for public on Sunday 23 September 2018. Journey times * Hong Kong (West Kowloon) – Futian: 14 minutes * Hong Kong (West Kowloon) – Shenzhen North: 19 minutes (fastest) * Hong Kong (West Kowloon) ...
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Hong Kong West Kowloon Railway Station
West Kowloon station (abbreviated WEK), also known as Hong Kong West Kowloon, is the southern terminus of and the only station on the Hong Kong section of the Guangzhou–Shenzhen–Hong Kong Express Rail Link (HSR). The station connects to China's HSR network across the border through dedicated tunnels and includes a Mainland Port Area where the laws of (Mainland) China are enforced. It was constructed by the MTR Corporation Limited as the project manager commissioned by the Hong Kong Government, through subcontractors. The terminal railway station is located in Jordan, West Kowloon, north of the West Kowloon Cultural District between the Airport Express and Tung Chung line's Kowloon station and the Tuen Ma line's Austin station. The footprint of the new station extends into the basement of the West Kowloon Cultural District. The original While construction of the station was still planned for completion in 2015, major flooding occurred in the railway tunne ...
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X-ray Laser
An X-ray laser is a device that uses stimulated emission to generate or amplify electromagnetic radiation in the near X-ray or extreme ultraviolet region of the spectrum, that is, usually on the order of several tens of nanometers (nm) wavelength. Because of high gain in the lasing medium, short upper-state lifetimes (1–100  ps), and problems associated with construction of mirrors that could reflect X-rays, X-ray lasers usually operate without mirrors; the beam of X-rays is generated by a single pass through the gain medium. The emitted radiation, based on amplified spontaneous emission, has relatively low spatial coherence. The line is mostly Doppler broadened, which depends on the ions' temperature. As the common visible-light laser transitions between electronic or vibrational states correspond to energies up to only about 10 eV, different active media are needed for X-ray lasers. Between 1978 and 1988 in Project Excalibur the U.S. military attempted to devel ...
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Strategic Defense Initiative
The Strategic Defense Initiative (SDI), derisively nicknamed the "''Star Wars'' program", was a proposed missile defense system intended to protect the United States from attack by ballistic strategic nuclear weapons (intercontinental ballistic missiles and submarine-launched ballistic missiles). The concept was announced on March 23, 1983, by President Ronald Reagan,Federation of American ScientistsMissile Defense Milestones Accessed March 10, 2007. a vocal critic of the doctrine of mutually assured destruction (MAD), which he described as a " suicide pact". Reagan called upon American scientists and engineers to develop a system that would render nuclear weapons obsolete. The Strategic Defense Initiative Organization (SDIO) was set up in 1984 within the US Department of Defense to oversee development. A wide array of advanced weapon concepts, including lasers, Duarte, F. J. (Ed.), ''Proceedings of the International Conference on Lasers '87'' (STS, McLean, Va, 1988). particle be ...
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