D0 (other)
D0 may refer to: * d0, the d electron count of a transition metal complex * D0 meson * D0 experiment, at the Tevatron collider at Fermilab, in Batavia, Illinois, US * D0 motorway (Czech Republic), the partially complete outer ring road of Prague * Dangling bond, in chemistry * DHL Air Limited (IATA code) See also * Do (other) Do, DO or D.O. may refer to: Languages * The English verb, ''do'', which may serve as an auxiliary verb; see do-support * ''Do'' (kana), a mora symbol in Japanese writing * Ditto mark People * Đỗ, a Vietnamese surname * Do (surname), includes ...

D Electron Count
The d electron count is a chemistry formalism used to describe the electron configuration of the valence electrons of a transition metal center in a coordination complex. The d electron count is an effective way to understand the geometry and reactivity of transition metal complexes. The formalism has been incorporated into the two major models used to describe coordination complexes; crystal field theory and ligand field theory, which is a more advanced version based on molecular orbital theory. Standard electron configuration perspective The electron configuration for transition metals predicted by the simple Aufbau principle and Madelung's rule has serious conflicts with experimental observations for transition metal centers under most ambient conditions. Under most conditions all of the valence electrons of a transition metal center are located in d orbitals while the standard model of electron configuration would predict some of them to be in the pertinent s orbital. Th ...
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D Meson
The D mesons are the lightest particle containing charm quarks. They are often studied to gain knowledge on the weak interaction. The strange D mesons (Ds) were called "F mesons" prior to 1986. Overview The D mesons were discovered in 1976 by the Mark I detector at the Stanford Linear Accelerator Center. Since the D mesons are the lightest mesons containing a single charm quark (or antiquark), they must change the charm (anti)quark into an (anti)quark of another type to decay. Such transitions involve a change of the internal charm quantum number, and can take place only via the weak interaction. In D mesons, the charm quark preferentially changes into a strange quark via an exchange of a W particle, therefore the D meson preferentially decays into kaons () and pions (). List of D mesons ‡ PDG reports the resonance width ~\left(\Gamma\right)~. Here the conversion \; \tau = \frac \; is given instead. – oscillations In 2021 it was ...
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D0 Experiment
D, or d, is the fourth letter in the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''dee'' (pronounced ), plural ''dees''. History The Semitic letter Dāleth may have developed from the logogram for a fish or a door. There are many different Egyptian hieroglyphs that might have inspired this. In Semitic, Ancient Greek and Latin, the letter represented ; in the Etruscan alphabet the letter was archaic, but still retained (see letter B). The equivalent Greek letter is Delta, Δ. Architecture The minuscule (lower-case) form of 'd' consists of a lower-story left bowl and a stem ascender. It most likely developed by gradual variations on the majuscule (capital) form 'D', and today now composed as a stem with a full lobe to the right. In handwriting, it was common to start the arc to the left of the vertical stroke, resulting in a serif at the top of the arc. This serif ...
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D0 Motorway (Czech Republic)
D0 motorway ( cs, Dálnice D0), formerly R1 expressway ( cs, Rychlostní silnice R1), or Prague Ring Road ( cs, Pražský okruh), also called the outer ring road, is a motorway in the Czech Republic. It is an outer ring of Prague and its first segment was opened in the 1980s. There is also an inner Prague Municipal Ring Road, which is still under construction as well. 40 km, from the planned length 80 km, are in operation. Two disjunct sections are opened to the public, one going all the way from the Ruzyně Airport to the interchange with the D1 highway, the other one being a road on the eastern border of Prague. A section connecting these two segments is to be built next. Other segments under preparation include a controversial bridge over the Vltava river near Suchdol, with locals proposing the road to be built in a less inhabited location to the north. Images File: R1 u Rep.jpg , Highway D0 near Prague-Zličín File: Most2 1009 972689.JPG , Bridge over Radot ...
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Dangling Bond
In chemistry, a dangling bond is an unsatisfied valence on an immobilized atom. An atom with a dangling bond is also referred to as an immobilized free radical or an immobilized radical, a reference to its structural and chemical similarity to a free radical. When speaking of a dangling bond, one is generally referring to the state described above, containing one electron and thus leading to a neutrally charged atom. There are also dangling bond defects containing two or no electrons. These are negatively and positively charged respectively. Dangling bonds with two electrons have an energy close to the valence band of the material and those with none have an energy that is closer to the conduction band. Properties In order to gain enough electrons to fill their valence shells (see also octet rule), many atoms will form covalent bonds with other atoms. In the simplest case, that of a single bond, two atoms each contribute one unpaired electron, and the resulting pair of electr ...
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DHL Air Limited
DHL is an American founded, German logistics company providing courier, package delivery and express mail service, which is a division of the German logistics firm Deutsche Post. The company group delivers over 1.8 billion parcels per year. DHL Express is market leader for parcel services in Europe and Germany's main Courier and Parcel Service. The company DHL itself was founded in San Francisco, United States, in 1969 and expanded its service throughout the world by the late 1970s. In 1979, under the name of ''DHL Air Cargo'', the company entered the Hawaiian islands with an inter-island cargo service using two DC-3 and four DC-6 aircraft. Adrian Dalsey and Larry Hillblom personally oversaw the daily operations until its eventual bankruptcy closed the doors in 1983. At its peak, ''DHL Air Cargo'' employed just over 100 workers, management and pilots. The company was primarily interested in offshore and intercontinental deliveries, but the success of FedEx prompted DHL's ...
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