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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 ...
This is a list of individuals serving in the United States House of Representatives (as of July 19, 2024, the 118th Congress ). [ 1] The membership of the House comprises 435 seats for representatives from the 50 states, apportioned by population, as well as six seats for non-voting delegates from U.S. territories and the District of Columbia ...
Diabetes mellitus, often known simply as diabetes, is a group of common endocrine diseases characterized by sustained high blood sugar levels. [10] [11] Diabetes is due to either the pancreas not producing enough insulin, or the cells of the body becoming unresponsive to the hormone's effects. [12]
The Environmental Protection Agency (EPA) is an independent agency of the United States government tasked with environmental protection matters. [2] President Richard Nixon proposed the establishment of EPA on July 9, 1970; it began operation on December 2, 1970, after Nixon signed an executive order. [3]
Rayon, also called viscose[ 1] and commercialised in some countries as sabra silk or cactus silk, [ 2] is a semi-synthetic fiber, [ 3] made from natural sources of regenerated cellulose, such as wood and related agricultural products. [ 4] It has the same molecular structure as cellulose.
List of chemical elements. 118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z ). [ 1]
The following is a list of rock types recognized by geologists. There is no agreed number of specific types of rock. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type. Additionally, different classification systems exist for each major type of rock. [1]
American retail corporation Walmart has been the world's largest company by revenue since 2014. [ 1] The list is limited to the largest 50 companies, all of which have annual revenues exceeding US$130 billion. This list is incomplete, as not all companies disclose their information to the media or general public. [ 3]