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Approximately 1 ml per 3 liters (1 part in 3000 by volume, alternatively 1 ⁄ 4 teaspoonful per US gallon) of tetraacetylethylenediamine (TAED)-based laundry booster (concentrations of TAED vary). A source of ultraviolet light, [8] from sunlight or a UV lamp. [7] Xanthan gum or arrowroot can be added to the solution, creating an easier-to ...
The array of equipment needed to measure light energy reaching beyond the visible spectrum towards the ultraviolet could cost a laboratory as much as $3,000, a huge amount in 1940. [ 2 ] : 149 Repeated readings of a sample were taken to produce photographic plates showing the absorption spectrum of a material at different wavelengths.
Yoko Hasuo (born 1952), the wife of Japanese amateur astronomer Ryuichi Hasuo, was cotranslator of the International Halley Watch manual into Japanese. She has been supportive of her husband's activity as a member of the Comet Conference and Cometary Summer School in Japan (also see 6887 Hasuo) JPL · 7136: 7137 Ageo: 1994 AQ 1
A T-28 Trojan was the first US fixed wing attack aircraft (non-transport type) lost in South Vietnam, during the Vietnam War. Capt. Robert L. Simpson, USAF, Detachment 2A, 1st Air Commando Group, and Lt. Hoa, RVNAF, were shot down by ground fire on August 28, 1962, while flying close air support. Neither crewman survived.
In physics, a wave packet is a short "burst" or "envelope" of wave action that travels as a unit. A wave packet can be analyzed into, or can be synthesized from, an infinite set of component sinusoidal waves of different wavenumbers, with phases and amplitudes such that they interfere constructively only over a small region of space, and destructively elsewhere.
1998 uv 24 Wlodek Kofman (born 1945) directs the Laboratoire de Planétologie at the Université Joseph Fourier, Grenoble. He is principal investigator on the Rosetta mission's CONSERT experiment, which will use the transmission of radio waves through the nucleus of comet 46P/Wirtanen to build up a three-dimensional image.
2010 TK 7 was confirmed to be the first known Earth trojan in 2011. It is located in the L 4 Lagrangian point, which lies ahead of the Earth. [14] (614689) 2020 XL 5 was found to be another Earth trojan in 2021. It is also at L4. [15] [16] (687170) 2011 QF 99 was identified as the first Uranus trojan in 2013. It is located at the L 4 Lagrangian ...
A walkie-talkie, more formally known as a handheld transceiver, HT, or handheld radio, is a hand-held, portable, two-way radio transceiver.Its development during the Second World War has been variously credited to Donald Hings, radio engineer Alfred J. Gross, Henryk Magnuski and engineering teams at Motorola.