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Entropy is a scientific concept, as well as a measurable physical property that is most commonly associated with a state of disorder, randomness, or uncertainty. The term and the concept are used in diverse fields, from classical thermodynamics, where it was first recognized, to the microscopic description of nature in statistical physics, and to the principles of information theory. It has found far-ranging applications in chemistry and physics, in biological systems and their relation to life, in cosmology, economics, sociology, weather science, climate change, and information systems including the transmission of information in telecommunication.
Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as temporal frequency to emphasize the contrast to spatial frequency, and ordinary frequency to emphasize the contrast to angular frequency. Frequency is measured in hertz (Hz) which is equal to one event per second. The period is the duration of time of one cycle in a repeating event, so the period is the reciprocal of the frequency. For example: if a newborn baby's heart beats at a frequency of 120 times a minute, its period, T—the time interval between beats—is half a second. Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals (sound), radio waves, and light.
Tracy Lauren Marrow, better known by his stage name Ice-T, is an American rapper, songwriter, actor and producer. He began his career as an underground rapper in the 1980s and was signed to Sire Records in 1987, when he released his debut album Rhyme Pays—the second hip-hop album to carry an explicit content sticker. The following year, he founded the record label Rhyme $yndicate Records and released another album, Power, which would go platinum. He also released several other albums that went gold.
ISO 8601 is an international standard covering the worldwide exchange and communication of date- and time-related data. It is maintained by the Geneva-based International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019. The purpose of standard ISO 8601 is to provide a well-defined, unambiguous method of representing calendar dates and times in worldwide communications, especially to avoid misinterpreting numeric dates and times when such data is transferred between countries with different conventions for writing numeric dates and times.
Thomas Stearns Eliot was a poet, essayist, publisher, playwright, literary critic and editor. Considered one of the 20th century's major poets, he is a central figure in English-language Modernist poetry.
Tyrannosaurus is a genus of tyrannosaurid theropod dinosaur. The species Tyrannosaurus rex, often called T. rex or colloquially T-Rex, is one of the best represented of these large theropods. Tyrannosaurus lived throughout what is now western North America, on what was then an island continent known as Laramidia. Tyrannosaurus had a much wider range than other tyrannosaurids. Fossils are found in a variety of rock formations dating to the Maastrichtian age of the Upper Cretaceous period, 68 to 66 million years ago. It was the last known member of the tyrannosaurids and among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event.
In mathematics, a Fourier transform (FT) is a mathematical transform that decomposes functions depending on space or time into functions depending on spatial or temporal frequency, such as the expression of a musical chord in terms of the volumes and frequencies of its constituent notes. The term Fourier transform refers to both the frequency domain representation and the mathematical operation that associates the frequency domain representation to a function of space or time.
In classical mechanics, Newton's laws of motion are three laws that describe the relationship between the motion of an object and the forces acting on it. The first law states that an object either remains at rest or continues to move at a constant velocity, unless it is acted upon by an external force. The second law states that the rate of change of momentum of an object is directly proportional to the force applied, or, for an object with constant mass, that the net force on an object is equal to the mass of that object multiplied by the acceleration. The third law states that when one object exerts a force on a second object, that second object exerts a force that is equal in magnitude and opposite in direction on the first object.
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Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive. Three of the most common types of decay are alpha decay, beta decay, and gamma decay, all of which involve emitting one or more particles. The weak force is the mechanism that is responsible for beta decay, while the other two are governed by the usual electromagnetic and strong forces.
Clifford Joseph Harris Jr., better known by the stage names T.I. and Tip, is an American rapper, actor, record producer, and entrepreneur. He signed his first major-label record deal in 1999 with Arista Records subsidiary LaFace. In 2001, he released his debut album and only project with the label, I'm Serious, and formed the southern hip hop group P$C. Upon being dropped from Arista, Harris signed to Atlantic and soon co-founded his own label imprint, Grand Hustle Records, which he launched in 2003. Harris is also known as one of the pioneers of the hip hop subgenre trap music, along with fellow Atlanta-based rappers Jeezy and Gucci Mane.
Anaspida is an extinct group of primitive jawless vertebrates that lived primarily during the Silurian period, and became extinct soon after the start of the Devonian. They were classically regarded as the ancestors of lampreys. Anaspids were small marine agnathans that lacked a heavy bony shield and paired fins, but have a striking highly hypocercal tail. They first appeared in the early Silurian, and flourished until the early Devonian, when they disappear from the fossil record.
The ICC Men's T20 World Cup is the international championship of Twenty20 International cricket. Organised by cricket's governing body, the International Cricket Council (ICC), the tournament currently consists of 16 teams, comprising the top ten teams from the rankings at the given deadline and six other teams chosen through the T20 World Cup Qualifier. All matches are played as Twenty20 Internationals.
The Internet of Things (IoT) describes physical objects, that are embedded with sensors, processing ability, software, and other technologies, and that connect and exchange data with other devices and systems over the Internet or other communications networks.
AT&T Inc. is an American multinational conglomerate holding company that is Delaware-registered but headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's largest telecommunications company and the largest provider of mobile telephone services in the U.S. As of 2020, AT&T was ranked 9th on the Fortune 500 rankings of the largest United States corporations, with revenues of $181 billion.
The 2021 ICC Men's T20 World Cup is scheduled to be the seventh ICC Men's T20 World Cup tournament, with matches taking place in the United Arab Emirates and Oman from 17 October to 14 November 2021. The West Indies are the defending champions.
Birkeniiformes is an extinct order of jawless fish belonging to the class Anaspida.
Septentrionia is an extinct genus of jawless fish belonging to the family Septentrioniidae. It is the type genus of its family.
Anaspidomorphi (anaspidomorphs) is an extinct superclass of jawless fish.
References
- ↑ Blom, H., Märss, T. & Miller, C.G. 2002. Silurian and earliest Devonian birkeniid anaspids from the Northern Hemisphere. Transactions of the Royal Society of Edinburgh, Earth Sciences, 92[2001]: 263–323.
