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Singlet Fission
Singlet may refer to: * singlet state, in theoretical physics, a quantum state with zero spin * Singlet fission, in molecular photophysics * in spectroscopy, an entity appearing as a single peak; see NMR spectroscopy * in optics, a single lens element, the building blocks of lens systems; see lens (optics) * a one-piece collarless garment, also known as a sleeveless shirt or vest ** wrestling singlet, a one-piece garment specific to wrestling * BID/60, a British encryption machine * Singlet oxygen, the common name used for an excited form of molecular oxygen {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Singlet State
In quantum mechanics, a singlet state usually refers to a system in which all electrons are paired. The term 'singlet' originally meant a linked set of particles whose net angular momentum is zero, that is, whose overall spin quantum number s=0. As a result, there is only one spectral line of a singlet state. In contrast, a doublet state contains one unpaired electron and shows splitting of spectral lines into a doublet, and a triplet state has two unpaired electrons and shows threefold splitting of spectral lines. History Singlets and the related Spin (physics), spin concepts of Doublet state, doublets and Triplet state, triplets occur frequently in atomic physics and nuclear physics, where one often needs to determine the total spin of a collection of particles. Since the only observed fundamental particle with zero spin is the extremely inaccessible Higgs boson, singlets in everyday physics are necessarily composed of sets of particles whose individual spins are non-zero, e.g. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Singlet Fission
Singlet may refer to: * singlet state, in theoretical physics, a quantum state with zero spin * Singlet fission, in molecular photophysics * in spectroscopy, an entity appearing as a single peak; see NMR spectroscopy * in optics, a single lens element, the building blocks of lens systems; see lens (optics) * a one-piece collarless garment, also known as a sleeveless shirt or vest ** wrestling singlet, a one-piece garment specific to wrestling * BID/60, a British encryption machine * Singlet oxygen, the common name used for an excited form of molecular oxygen {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NMR Spectroscopy
Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy or magnetic resonance spectroscopy (MRS), is a spectroscopic technique based on re-orientation of atomic nuclei with non-zero nuclear spins in an external magnetic field. This re-orientation occurs with absorption of electromagnetic radiation in the radio frequency region from roughly 4 to 900 MHz, which depends on the isotopic nature of the nucleus and increases proportionally to the strength of the external magnetic field. Notably, the resonance frequency of each NMR-active nucleus depends on its chemical environment. As a result, NMR spectra provide information about individual functional groups present in the sample, as well as about connections between nearby nuclei in the same molecule. As the NMR spectra are unique or highly characteristic to individual compounds and functional groups, NMR spectroscopy is one of the most important methods to identify molecular structures, particularly of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lens (optics)
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (''elements''), usually arranged along a common axis. Lenses are made from materials such as glass or plastic and are ground, polished, or molded to the required shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing. Devices that similarly focus or disperse waves and radiation other than visible light are also called "lenses", such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses. Lenses are used in various imaging devices such as telescopes, binoculars, and cameras. They are also used as visual aids in glasses to correct defects of vision such as myopia and hypermetropia. History The word ''lens'' comes from , the Latin name of the lentil (a seed of a lentil pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sleeveless Shirt
A sleeveless shirt, is a shirt that is manufactured without sleeves or with sleeves that have been cut off. Depending on the style, they can be worn as undershirts, by athletes in sports such as track and field and triathlon, or as casual wear by both men and women. Tank top In the United States and Canada, any casual sleeveless shirt can be called tank top or tank shirt, with several specific varieties. It is named after '' tank suits'', one-piece bathing suits of the 1920s worn in tanks or swimming pools. The upper garment is worn commonly by both men and women. The build of a tank top is simple: the neck and armholes are often reinforced for durability. They often have large armholes and neck holes, which may reach down as far as the bottom of the chest; particularly low armholes are referred to as "dropped armholes." Women's tank tops have smaller holes, to conceal their breasts. They are also sometimes made long to make tucking into pants easier. In almost all cases, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vest
A waistcoat ( UK and Commonwealth, or ; colloquially called a weskit) or vest ( US and Canada) is a sleeveless upper-body garment. It is usually worn over a dress shirt and necktie and below a coat as a part of most men's formal wear. It is also sported as the third piece in the traditional three-piece male suit. Any given waistcoat can be simple or ornate, or for leisure or luxury. Historically, the waistcoat can be worn either in the place of, or underneath, a larger coat, dependent upon the weather, wearer, and setting. Daytime formal wear and semi-formal wear commonly comprises a contrastingly coloured waistcoat, such as in buff or dove gray, still seen in morning dress and black lounge suit. Traditionally, a white waistcoat is worn for white tie and a black one for black tie. Names The term ''waistcoat'' is used in the United Kingdom and many Commonwealth countries. The term ''vest'' is used widely in the United States and Canada, and is often worn as part of f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wrestling Singlet
A wrestling singlet (or simply singlet) is a one-piece, tight-fitting uniform, usually made of spandex/lycra or nylon, used in wrestling. The uniform is tight-fitting so as not to get grasped accidentally by one's opponent, and allows the referee to see each wrestler's body clearly when awarding points or a pin. Unlike judo, it is illegal to grasp an opponent's clothing in all styles of amateur wrestling. Colors In most high school and college wrestling matches, the competitors wear singlets in their team colors. To designate a competitor's color for scoring purposes an anklet may also be worn. In international wrestling ( freestyle and Greco-Roman), wrestlers bring a red and a blue singlet (or reversible singlet) and are told before the match which color to wear. Historically, professional wrestlers traditionally wore trunks and boots but singlets are also common among wrestlers who usually (although not always) had an amateur background such as Bret Hart, Kurt Angle and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BID/60
BID/60, also called Singlet, was a British encryption machine. It was used by the British intelligence services from around 1949 or 1950 onwards. The system is a rotor machine In cryptography, a rotor machine is an electro-mechanical stream cipher device used for encrypting and decrypting messages. Rotor machines were the cryptographic state-of-the-art for much of the 20th century; they were in widespread use from ..., and would appear to have used 10 rotors. There are some apparent similarities between this machine and the US / NATO KL-7 device. In 2005, a Singlet machine was exhibited in the ''Enigma and Friends'' display at the Bletchley Park museum. References External links Jerry Proc's page on BID/60 {{DEFAULTSORT:BID 60 Rotor machines Cryptographic hardware Cold War military equipment of the United Kingdom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
