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G0 (other)
G0, G0, G0, g0, or G-zero, may refer to: Science * G0 phase, G0 phase of cell division * G0 star, a subclass of G-stellar classification, class stars * Conductance quantum ("quantum of conductance"), notated G0 * Geometric continuity, notated G0 * Group 0, an alternate name for Group 18 of the Periodic table – the Noble gases ** G0, a hypothetical group in the Periodic table, which would consist of neutronium * Standard gravity, notated g0 Other uses * G0, abbreviation for ground zero * G0, the name of the G (musical note), musical note G in octave 0 * G-Zero world – the term used for the emerging power vacuum in international politics in the early 21st Century * Ghana International Airlines, IATA airline designator G0 * G0, a block of character codes in the Teletext character set See also * 0G (other) * Go (other) * Zero-G (other) {{Letter-Number Combination Disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
G0 Phase
The G0 phase describes a cellular state outside of the replicative cell cycle. Classically, cells were thought to enter G0 primarily due to environmental factors, like nutrient deprivation, that limited the resources necessary for proliferation. Thus it was thought of as a ''resting phase''. G0 is now known to take different forms and occur for multiple reasons. For example, most adult neuronal cells, among the most metabolically active cells in the body, are fully differentiated and reside in a terminal G0 phase. Neurons reside in this state, not because of stochastic or limited nutrient supply, but as a part of their developmental program. G0 was first suggested as a cell state based on early cell cycle studies. When the first studies defined the four phases of the cell cycle using radioactive labeling techniques, it was discovered that not all cells in a population proliferate at similar rates. A population's "growth fraction" – or the fraction of the population that was g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stellar Classification
In astronomy, stellar classification is the classification of stars based on their stellar spectrum, spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a Prism (optics), prism or diffraction grating into a spectrum exhibiting the Continuum (spectrum), rainbow of colors interspersed with spectral lines. Each line indicates a particular chemical element or molecule, with the line strength indicating the abundance of that element. The strengths of the different spectral lines vary mainly due to the temperature of the photosphere, although in some cases there are true abundance differences. The ''spectral class'' of a star is a short code primarily summarizing the ionization state, giving an objective measure of the photosphere's temperature. Most stars are currently classified under the Morgan–Keenan (MK) system using the letters ''O'', ''B'', ''A'', ''F'', ''G'', ''K'', and ''M'', a sequence from the hottest (''O'' type) to the cool ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conductance Quantum
The conductance quantum, denoted by the symbol , is the quantized unit of electrical conductance. It is defined by the elementary charge ''e'' and Planck constant ''h'' as: : G_0 = \frac = 4 \alpha \epsilon_0 c = It appears when measuring the conductance of a quantum point contact, and, more generally, is a key component of the Landauer formula, which relates the electrical conductance of a quantum conductor to its quantum properties. It is twice the reciprocal of the von Klitzing constant (2/''R''K). Note that the conductance quantum does not mean that the conductance of any system must be an integer multiple of ''G''0. Instead, it describes the conductance of two quantum channels (one channel for spin up and one channel for spin down) if the probability for transmitting an electron that enters the channel is unity, i.e. if transport through the channel is ballistic. If the transmission probability is less than unity, then the conductance of the channel is less than ''G''0. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geometric Continuity
In mathematical analysis, the smoothness of a function (mathematics), function is a property measured by the number of Continuous function, continuous Derivative (mathematics), derivatives (''differentiability class)'' it has over its Domain of a function, domain. A function of class C^k is a function of smoothness at least ; that is, a function of class C^k is a function that has a th derivative that is continuous in its domain. A function of class C^\infty or C^\infty-function (pronounced C-infinity function) is an infinitely differentiable function, that is, a function that has derivatives of all Order of derivation, orders (this implies that all these derivatives are continuous). Generally, the term smooth function refers to a C^-function. However, it may also mean "sufficiently differentiable" for the problem under consideration. Differentiability classes Differentiability class is a classification of functions according to the properties of their derivatives. I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Group 0
The noble gases (historically the inert gases, sometimes referred to as aerogens) are the members of group 18 of the periodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn) and, in some cases, oganesson (Og). Under standard conditions, the first six of these elements are odorless, colorless, monatomic gases with very low chemical reactivity and cryogenic boiling points. The properties of oganesson are uncertain. The intermolecular force between noble gas atoms is the very weak London dispersion force, so their boiling points are all cryogenic, below . The noble gases' inertness, or tendency not to react with other chemical substances, results from their electron configuration: their outer shell of valence electrons is "full", giving them little tendency to participate in chemical reactions. Only a few hundred noble gas compounds are known to exist. The inertness of noble gases makes them useful whenever chemical reactions are unwanted. For ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neutronium
Neutronium (or neutrium, neutrite, or element zero) is a hypothetical substance made purely of neutrons. The word was coined by scientist Andreas von Antropoff in 1926 (before the 1932 discovery of the neutron) for the hypothetical "element of atomic number zero" (with no protons in its nucleus) that he placed at the head of the periodic table (denoted by -). However, the meaning of the term has changed over time, and from the last half of the 20th century onward it has been also used to refer to extremely dense substances resembling the neutron-degenerate matter theorized to exist in the cores of neutron stars. In neutron stars Neutronium is used in popular physics literature to refer to the material present in the cores of neutron stars (stars which are too massive to be supported by electron degeneracy pressure and which collapse into a denser phase of matter). In scientific literature the term "neutron-degenerate matter" or simply neutron matter is used for this mat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Standard Gravity
The standard acceleration of gravity or standard acceleration of free fall, often called simply standard gravity and denoted by or , is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth. It is a constant defined by standard as . This value was established by the third General Conference on Weights and Measures (1901, CR 70) and used to define the standard weight of an object as the product of its mass and this nominal acceleration. The acceleration of a body near the surface of the Earth is due to the combined effects of gravity and centrifugal acceleration from the rotation of the Earth (but the latter is small enough to be negligible for most purposes); the total (the apparent gravity) is about 0.5% greater at the poles than at the Equator. Although the symbol is sometimes used for standard gravity, (without a suffix) can also mean the local acceleration due to local gravity and centrifugal acceleration, which varies depending on on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ground Zero
A hypocenter or hypocentre (), also called ground zero or surface zero, is the point on the Earth's surface directly below a nuclear explosion, meteor air burst, or other mid-air explosion. In seismology, the hypocenter of an earthquake is its point of origin below ground; a synonym is the focus of an earthquake. Generally, the terms ''ground zero'' and ''surface zero'' are also used in relation to epidemics, and other disasters to mark the point of the most severe damage or destruction. The term is distinguished from the term zero point in that the latter can also be located in the air, underground, or underwater. Trinity, Hiroshima and Nagasaki The term "ground zero" originally referred to the hypocenter of the Trinity (nuclear test), Trinity test in Jornada del Muerto, Jornada del Muerto desert near Socorro, New Mexico, and the atomic bombings of Hiroshima and Nagasaki in Japan. The United States Strategic Bombing Survey of the atomic attacks, released in June 1946, used th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
G (musical Note)
G, also called Sol or So, is the fifth note of the fixed-do solfège starting on C. It is the fifth note and the eighth semitone of the solfège. As such it is the dominant, a perfect fifth above C or perfect fourth below C. When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of middle G (G4) note is approximately 391.995 Hz. See pitch for a discussion of historical variations in frequency. It has enharmonic equivalents of F (F-double sharp) and A (A-double flat). In the medieval period the musical note G was known as gesolreut within the Guidonian hand hexachord system. Designation by octave Scales Common scales beginning on G * G major: G A B C D E F G * G natural minor: G A B C D E F G * G harmonic minor: G A B C D E F G * G melodic minor ascending: G A B C D E F G * G melodic minor descending: G F E D C B A G Diatonic scales * G Ionian: G A B C D E F G * G Dorian: G A B C D E F G * G Phrygian: G A B C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
G-Zero World
''Every Nation for Itself: Winners and Losers in a G-Zero World'' is a 2012 non-fiction book by Ian Bremmer that explains the growing "G-Zero" power vacuum in international politics as no country or group of countries has the political and economic leverage to drive an international agenda or provide global public goods. The book gives a historical summary of the global political order and American role in world affairs from the post-World War II establishment of the Bretton Woods system up through the present day. It outlines the various tolls that the G-Zero will exact, potential winners and losers in such an environment, and makes predictions as to what kind of political order will succeed the G-Zero. Overview "G-Zero" is Bremmer's reference to a perceived shift away from the preeminence of the Group of Seven industrialized countries and the expanded Group of Twenty, which includes major emerging powers like China, India, Brazil, Turkey and others. He also rejects terms ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ghana International Airlines
Ghana International Airlines (GIA) was the national airline of the Republic of Ghana between 2005 and 2010. The airline suspended operations on 13 May 2010. GIA operated scheduled and charter passenger and cargo services. Its main base was Kotoka International Airport, Accra. History The airline was set up in 2004 as a partnership between the government of Ghana and a group of private international investors. A team of executives led by Ralph Atkin, founder of SkyWest Airlines in the United States, was installed, which also included Brian Presbury, the former CEO of Kenya Airways. Ghana International Airlines commenced operations on 29 October 2005 with daily flights between Accra and London Gatwick Airport using a Boeing 757 wet leased from Ryan International Airlines. The airline commenced seasonal service to OR Tambo International Airport in Johannesburg, South Africa, in 2006. Flights to Düsseldorf, Germany, began in 2008. It is owned by the Ghanaian government (70%) and U ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teletext Character Set
This article covers technical details of the character encoding system defined by ETS 300 706 of the ETSI, a standard for World System Teletext, and used for the Viewdata and Teletext variants of Videotex in Europe. Character sets The following tables show various Teletext character sets. Each character is shown with a potential Unicode equivalent if available. Space and control characters are represented by the abbreviations for their names. Control characters Control characters are used to set foreground and background color (black, red, green, yellow, blue, magenta, cyan, white, flash), character height (normal, double width, double height, double), current default character set, and other attributes. In formats where compatibility with ECMA-48 ANSI escape sequences are a standard for in-band signaling to control cursor location, color, font styling, and other options on video text terminals and terminal emulators. Certain sequences of bytes, most starting with an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
