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In the United States a longer duty cycle is used, 50% for battery-powered buoys (20 seconds on, 20 seconds off) and 75% for on-shore beacons. Ramarks are wide-band beacons which transmit continuously on the radar bands without having to be triggered by an incoming radar signal. The transmission forms a line of Morse characters on the display ...
Research. v. t. e. Promotional merchandise are products branded with a logo or slogan and distributed at little or no cost to promote a brand, corporate identity, or event. Such products, which are often informally called promo products, swag [1] ( mass nouns ), tchotchkes, or freebies ( count nouns ), are used in marketing and sales.
From January 2008 to December 2012, if you bought shares in companies when Robert D. Beyer joined the board, and sold them when he left, you would have a -3.9 percent return on your investment, compared to a -2.8 percent return from the S&P 500.
Coupon collector's problem. In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more ...
The Argentine railway network consisted of a 47,000 km (29,204 mi) network at the end of the Second World War and was, in its time, one of the most extensive and prosperous in the world. However, with the increase in highway construction, there followed a sharp decline in railway profitability, leading to the break-up in 1993 of Ferrocarriles ...
Heather Cox Richardson (born 1962) is an American historian. She is a professor of history at Boston College, where she teaches courses on the American Civil War, the Reconstruction Era, the American West, and the Plains Indians. [1] She previously taught history at MIT and the University of Massachusetts Amherst. [2]
Under normal conditions, humans can metabolize relatively large quantities of glutamate, which is naturally produced in the gut in the course of protein hydrolysis. The median lethal dose (LD 50) is between 15 and 18 g/kg body weight in rats and mice, respectively, five times the LD 50 of table salt (3 g/kg in rats).
Nancy Grace Roman Space Telescope →. The James Webb Space Telescope ( JWST) is a space telescope designed to conduct infrared astronomy. As the largest telescope in space, it is equipped with high-resolution and high-sensitivity instruments, allowing it to view objects too old, distant, or faint for the Hubble Space Telescope. [ 10]