delta gamma

A gamma-ray burst, also known as a gamma-ray burst, was a phenomenon in which the intensity of gamma-rays from a certain direction in the sky suddenly increased and then rapidly weakened in a short period of time (0.1 - 1000 seconds). The radiation was mainly concentrated in the energy range of 0.1 - 100 MeV. It was discovered during the Cold War when American spy satellites were monitoring nuclear explosions in 1967. The discovery was published by scientists in 1973. The source could be the supernova explosion of a massive star at the end of its life, or the collision and merger of compact celestial bodies (such as neutron stars, black holes, etc.). The energy released in a short period of time could be comparable to or even higher than the total energy released by the main sequence star stage of the sun for 10 billion years. The source galaxy was billions of light-years away, and the energy of the explosion was extremely high and extremely rare. All the explosions observed by humans originated from outside the Milky Way, but the magnetars in the Milky Way would produce similar soft gamma-ray repeated bursts. After the initial gamma-ray flash, it usually emitted an "afterglow" with a longer length (such as X-rays, violet rays, visible light, infrared rays, microwave rays, and radio waves) and a longer duration. Before 1997, due to the lack of observational data, there was no recognized theoretical model for the explosion phenomenon. Since 1997, with the observation of X-rays and visible light afterglow while detecting gamma-ray bursts, the red shift of visible light afterglow could be calculated using techniques such as the spectral analysis. For example, in the Ordovician-Silurian extinction event about 445 million years ago, there was a hypothesis that gamma-ray bursts caused the event. At that time, the gamma-ray burst source was about 6000 light-years away from Earth. The gamma-ray beam swept across the Earth for about 10 seconds. Although the energy density was greatly reduced due to the distance, it was not enough to directly kill living things. However, it destroyed the Earth's atmosphere, destroyed the oxygen layer, and exposed the Earth's surface to infrared radiation. It also caused nitrogen and oxygen molecules to disintegrate to form free radical, which then re-combined to form nitrogen and oxygen compounds. These substances formed an smog to block sunlight. As a result, photosynthesis could not be carried out effectively, the bottom of the food chain broke, the temperature dropped, the sea level fell, and a series of consequences caused about 85% of species to go extinct. On October 9,2022, the brightest gamma-ray burst was discovered 2.4 billion light-years away from Earth. Its energy was equivalent to eight solar masses multiplied by C squared. Because it lasted longer than two seconds, it was determined to be caused by the collapse of a massive star's core.(The other type is caused by the merger and explosion of two extremely dense celestial bodies such as neutron stars or black holes. The duration is usually less than 2 seconds and the gravitational waves are emitted at the same time.) This discovery was discovered by China's Huiyan satellite and the polar eye satellite. The Institute of High Energy Physics of the Chinese Academy of Sciences and 41 scientific research institutions around the world jointly published the research results. While waiting for the TV series, you can also click on the link below to read the classic original work of "Dafeng Nightwatchman"!

The gamma-ray camera could be used in early drug development and nuclear medical imaging. It could be used to analyze the distribution of human bodies and radioactive markers. It could also be used to quickly and accurately locate radioactive sources, estimate environmental dose rates, and identify the types of radioactive natures, so as to achieve the purpose of quickly and accurately describing the on-site radiation environment. It could serve various purposes such as radiation protection, risk assessment, dose monitoring, anti-security, and so on. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

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The Deltadromeus (scientific name: Deltadromeus, meaning "Delta-runner") was a carnivorous dinosaur of the Ceratosaurus class. It lived in North Africa during the Upper cretaceous period, about 95 million years ago. Its hind legs were strong and slender, which indicated that it was a fast predator. An unpublished study showed that it might be one of the longest carnivorous dinosaurs, with a length of 13.3 meters and a weight of about 3.5 tonnes. It was longer than the carnivorous dinosaur's lower order, but a more complete specimen was estimated to be 8.1 meters long. The Deltasaurus fossil was first discovered by Gabrielle Leon in 1995 and described by Paul Sereno the following year. Its skeletal fossils were found together with the larger Sharktooth Dragon, probably living at the same time as the larger Spinosaurus. The model species is the agile Deltasaurus (D. agilis), which was considered a fast animal because its body structure was good for running. The Deltasaurus was originally described as a large coelothoracic dragon that was close to a wounded dragon, and was later classified as a Ceratosaurus. In 2016, Guarichusaurus was published, making it a hard tail dragon, and it was thought to be a secondary synonym of the Bahalian dragon. Its specimen was found in the Kem Kem Beds in Morocco. The known skeleton was only part of the vertebrae, forelimbs, scapula, coracoid, and incomplete pubis and hind legs. The fossil was incomplete. Although it was initially thought to be a predator, it was later thought to belong to the Northwest Artigosaurid family, which had a slender body, long neck and legs, and mainly fed on plants and small animals, but this view was still controversial. Read Dragon Reincarnation, Revenge Begins at Five! cartoon

In the video camera, the term "gamma-ray" referred to the characteristic of the gamma-ray. It was the curve characteristic formed in the non-linear circuit after being processed by the gamma-ray correction circuit. This feature was more suitable for high-definition camera technology, where the slope processing of the highlight part was called the knee processing. The cameraman could use the precise digital processing circuit to fine-tune the camera's gamma-characteristic, thereby achieving effective control over the image's tone level and high definition. Different cameras may be equipped with different gamma-curves. For example, the LUMIX BGH1 camera had a built-in V-LogL gamma-curve, and the Canon R5C had a Canon Log3 gamma-curve. These gamma-curves were suitable for different post-production needs, such as simple layering and color adjustment. In terms of the color correction process, different broadcasting platforms also had different reference settings for gamma-correction. For example, TV stations broadcast TV series/documentaries as REC709 GAMMA2.4, online platform drama series/online platform as REC709 GAMMA2.2, cinema P3 -DCIGAMMA2.6, etc. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>