Demonstration

Demonstration may refer to:

Music

Welcome to Hell

Welcome to Hell is the debut studio album by English heavy metal band Venom. It was released in December 1981, through Neat Records, at the culmination of the New Wave of British Heavy Metal movement. The music of Welcome to Hell is often described as speed metal, but it had a great influence on the then-emerging thrash metal style, and crystallised the elements of what later became known as death metal and black metal.

The sound of the album is very noisy and rough, perhaps in part because the band thought they were recording a demo when they recorded the album over a period of only three days. According to author Dayal Patterson, Welcome to Hell might be the first black metal album.

Critical reception

British journalist Geoff Barton stated in his 1981 five-star review of Welcome to Hell that the album had "the hi-fi dynamics of a 50-year-old pizza", and that it "brought a new meaning to the word 'cataclysmic'". According to Allmusic's journalist Eduardo Rivadavia, highlights of the album include "Welcome to Hell", "In League with Satan", "One Thousand Days in Sodom" and "Witching Hour"; Rivadavia said of "Witching Hour": "Possibly Venom's single most important track, in it you'll hear a number of stylistic devices which would later pervade all extreme metal genres, indeed become their most regularly abused clichés."

Elbit Hermes 900

The Elbit Systems Hermes 900 Kochav (Star) is an Israeli medium size multi-payload unmanned aerial vehicle (UAV) designed for medium altitude long endurance (MALE) tactical missions. It has an endurance of over 30 hours and can fly at a maximum altitude of 30,000 feet (9,100 m), with a primary mission of reconnaissance, surveillance and communications relay. The Hermes 900 has a wingspan of 15 m (49 ft) and weighs 970 kg (2,140 lb), with a payload capability of 300 kg (660 lb). Payload options include electro-optical/infrared sensors, synthetic aperture radar/ground-moving target indication, communications and electronic intelligence, electronic warfare, and hyperspectral sensors.

Operational history

The Hermes 900 was first used by Israel during Operation Protective Edge in July 2014. It had been undergoing test flights and wasn't planned for operational deployment until late 2015, but it was introduced during the operation for unique missions that it could perform better than the Hermes 450. A few days after receiving orders to deploy the aircraft, one Kochav was readied for "temporary activity." The Hermes 900's first operational mission took place on 15 July 2014, which was a link in a chain of operations that eventually led to a fighter jet attack that destroyed terrorist infrastructure. Maintenance on the aircraft during the operation was done by Elbit personnel because IAF ground teams had not yet been qualified to perform maintenance on it, and mission stations had Elbit representatives that guided the operators during combat flights. Following the end of the operation, the Hermes 900 returned to integration and flight testing to pass milestones that still needed to be met. The Hermes 900 was officially introduced into the IAF's operational lineup on 11 November 2015.