Quat
Quat may refer to: * Quat (surname), a Chinese surname * Quaternary ammonium cation, a class of chemical molecules used as a disinfectant, surfactant, drug etc. * Quaternion, a non-commutative extension of the complex numbers * Quaternary (other), referring to four parts, divisions, or sets. * Khat Khat or qat ( ''ch’at''; Oromo: ''Jimaa'', so, qaad, khaad, khat or chat, ar, القات ''al-qāt'') is a flowering plant native to eastern and southern Africa. Khat contains the alkaloid cathinone, a stimulant, which is said to cause ..., an African plant whose leaves are chewed as a stimulant * Phan Huy Quát, former prime minister of South Vietnam {{disambig ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Quaternion
In mathematics, the quaternion number system extends the complex numbers. Quaternions were first described by the Irish mathematician William Rowan Hamilton in 1843 and applied to mechanics in three-dimensional space. Hamilton defined a quaternion as the quotient of two '' directed lines'' in a three-dimensional space, or, equivalently, as the quotient of two vectors. Multiplication of quaternions is noncommutative. Quaternions are generally represented in the form :a + b\ \mathbf i + c\ \mathbf j +d\ \mathbf k where , and are real numbers; and , and are the ''basic quaternions''. Quaternions are used in pure mathematics, but also have practical uses in applied mathematics, particularly for calculations involving three-dimensional rotations, such as in three-dimensional computer graphics, computer vision, and crystallographic texture analysis. They can be used alongside other methods of rotation, such as Euler angles and rotation matrices, or as an alternative to ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Quaternary Ammonium Cation
In chemistry, quaternary ammonium cations, also known as quats, are positively charged polyatomic ions of the structure , R being an alkyl group or an aryl group. Unlike the ammonium ion () and the primary, secondary, or tertiary ammonium cations, the quaternary ammonium cations are permanently charged, independent of the pH of their solution. Quaternary ammonium salts or quaternary ammonium compounds (called quaternary amines in oilfield parlance) are salts of quaternary ammonium cations. Polyquats are a variety of engineered polymer forms which provide multiple quat molecules within a larger molecule. Quats are used in consumer applications including as antimicrobials (such as detergents and disinfectants), fabric softeners, and hair conditioners. As an antimicrobial, they are able to inactivate enveloped viruses (such as SARS-CoV-2). Quats tend to be gentler on surfaces than bleach-based disinfectants, and are generally fabric-safe. Synthesis Quaternary ammonium ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Quaternary (other)
The Quaternary is a geologic period. Quaternary (an adjective meaning "fourth in order" or "composed of four items") may also refer to: * Quaternary (chemistry) (see also Quaternary compound and Quaternary phase) * Quaternary structure of proteins * Quaternary sector of the economy, which encompasses knowledge-based services * Quaternary care, health care that includes highly specialized or experimental treatments * Quaternary numeral system (base-4) in mathematics * Quaternary counting system, as used in some human languages * Quaternary (EP), ''Quaternary'' (EP), an album by Mötley Crüe See also

* * * Quinary, positional number system with base 5 * Ternary (other) * Tertiary (other) {{Disambiguation ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]  

Quat (surname)
Quat may refer to: * Quat (surname), a Chinese surname * Quaternary ammonium cation, a class of chemical molecules used as a disinfectant, surfactant, drug etc. * Quaternion, a non-commutative extension of the complex numbers * Quaternary (other), referring to four parts, divisions, or sets. * Khat, an African plant whose leaves are chewed as a stimulant * Phan Huy Quát Phan Huy Quát (Hà Tĩnh Province, 12 June 1908 – 27 April 1979) was a South Vietnamese doctor and politician who served as Prime Minister of the Republic of Vietnam for four months in 1965. Early life Phan Huy Quát was born in Lộc Hà Dis ...

Khat
Khat or qat ( ''ch’at''; Oromo: ''Jimaa'', so, qaad, khaad, khat or chat, ar, القات ''al-qāt'') is a flowering plant native to eastern and southern Africa. Khat contains the alkaloid cathinone, a stimulant, which is said to cause excitement, loss of appetite, and euphoria. Among communities from the areas where the plant is native, khat chewing has a history as a social custom dating back thousands of years analogous to the use of coca leaves in South America and betel nut in Asia. The World Health Organization (WHO) classified it in 1980 as a drug of abuse that can produce psychological dependence, although the WHO does not consider khat addiction to be a serious problem. The legality of khat varies by region. In many countries, khat might not be a specifically controlled substance but may nevertheless be illegal under more general laws. It is a specifically controlled substance in some countries including Canada, Germany, the United Kingdom, and the United S ...
[...More Info...]       [...Related Items...]     OR:     [Wikipedia]   [Google]   [Baidu]