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2,4,5-Trichlorophenoxyacetic acid (also known as 2,4,5-T ), a synthetic auxin, is a chlorophenoxy acetic acid herbicide used to defoliate broad-leafed plants. It was developed in the late 1940s, synthesized by reaction of 2,4,5-Trichlorophenol and chloroacetic acid. It was widely used in the agricultural industry until being phased out ...
Active noise control ( ANC ), also known as noise cancellation ( NC ), or active noise reduction ( ANR ), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...
Safe listening is a framework for health promotion actions to ensure that sound-related recreational activities (such as concerts, nightclubs, and listening to music, broadcasts, or podcasts) do not pose a risk to hearing. [ 1] Wikiversity has learning resources about Global Audiology. While research shows that repeated exposures to any loud ...
These Basic Earbuds. The Work Earbuds Classic. Raycon. For everyday wear that’s easy to take in and out, these buds are the perfect pick! See it! Get The Work Earbuds Classic (originally $120 ...
Updated August 15, 2024 at 2:31 PM chart visualization Perchlorate , a chemical found in rocket fuel, has contaminated water and food and is more likely to be found in food given to babies and ...
Experts say it’s important to get the recommended minimum 0.8 grams of protein per kilogram of body weight a day (a kilogram is equal to 2.2 pounds). For the average person who weighs 150 pounds ...
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The economics term cost, also known as economic cost or opportunity cost, refers to the potential gain that is lost by foregoing one opportunity in order to take advantage of another. The lost potential gain is the cost of the opportunity that is accepted. Sometimes this cost is explicit: for example, if a firm pays $100 for a machine, its cost ...