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[30] In the 1930s, Allen B. DuMont made the first CRTs to last 1,000 hours of use, which was one of the factors that led to the widespread adoption of TV. [31] The first commercially made electronic TV sets with cathode-ray tubes were manufactured by Telefunken in Germany in 1934. [32] [33]
An August 2020 poll from Reuters/Ipsos, surveying 1,349, had 40% supporting Trump's move to ban the app, 30% opposed, and 30% uncertain. [92] A December 2022 poll from Rasmussen Reports, surveying 1,000 likely U.S. voters, found that 68% supported proposals to federally ban TikTok, with 43% strongly supporting a ban. Conversely, 24% surveyed ...
The proportional counter is a type of gaseous ionization detector device used to measure particles of ionizing radiation.The key feature is its ability to measure the energy of incident radiation, by producing a detector output pulse that is proportional to the radiation energy absorbed by the detector due to an ionizing event; hence the detector's name.
Suppose, a particular test for whether someone has been using cannabis is 90% sensitive, meaning the true positive rate (TPR) = 0.90. Therefore, it leads to 90% true positive results (correct identification of drug use) for cannabis users. The test is also 80% specific, meaning true negative rate (TNR) = 0.80.
The tape is pulled from the supply reel by a capstan and pinch roller, similar to those used in audio tape recorders. The tape passes across the erase head, which wipes any existing recording from the tape. The tape is wrapped around the head drum, using a little more than 180 degrees of the drum.
Gamma-ray sensors are also used for measuring the fluid levels in water and oil industries. [17] Typically, these use Co-60 or Cs-137 isotopes as the radiation source. In the US, gamma ray detectors are beginning to be used as part of the Container Security Initiative (CSI). These machines are advertised to be able to scan 30 containers per hour.
In the aftermath of the Dobbs ruling, state legislation and court rulings determine most aspects of abortion access in the United States. The following sections outline the current status of abortion law in the various states and territories; references to weeks refer to the number of weeks since the pregnant individual's last menstrual period, or LMP, which is typically used as a measure of ...
A pie chart showing the percentage by web browser visiting Wikimedia sites (April 2009 to 2012). In mathematics, a percentage (from Latin per centum 'by a hundred') is a number or ratio expressed as a fraction of 100.
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