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Maestro concertatore: the keyboard continuo player, who prepares singers and leads rehearsals. [ 3 ] Maestro direttore : the leader of the first violins of the orchestra (see concertmaster ), who may also have administrative duties such as hiring and paying musicians.
The roles of a conductor vary a great deal between different conducting positions and different ensembles. In some cases, a conductor will also be the musical director of the symphony, choosing the program for the entire season, including concerts by guest conductors, concerto soloists, pop concerts, and so on.
In solid-state physics, the valence band and conduction band are the bands closest to the Fermi level, and thus determine the electrical conductivity of the solid. In nonmetals, the valence band is the highest range of electron energies in which electrons are normally present at absolute zero temperature, while the conduction band is the lowest range of vacant electronic states.
Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...
Crystalline solids and molecular solids are two opposite extreme cases of materials that exhibit substantially different transport mechanisms. While in atomic solids transport is intra-molecular, also known as band transport, in molecular solids the transport is inter-molecular, also known as hopping transport.
Some conductors prefer to speak more broadly and defer to the concertmaster on such matters out of respect for the musicians who are expert specialists while the conductor is, often (unless they are a string player), a generalist. Full-time professional orchestras work with several conductors through the course of a regular season.
This makes liquids and gases poor conductors of heat. [1] Thermal contact conductance is the study of heat conduction between solid bodies in contact. A temperature drop is often observed at the interface between the two surfaces in contact. This phenomenon is said to be a result of a thermal contact resistance existing between the contacting ...
The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In normal (that is, non-superconducting) conductors, such as copper or silver, this decrease is limited by impurities and other defects. Even near absolute zero, a real sample of a normal conductor shows some resistance. In a superconductor, the ...