negative density
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Negative air ionization therapy — is the use of air ionisers as an experimental non pharmaceutical treatment for seasonal affective disorder (SAD) and mild depression. For SAD, a randomized controlled trial (RCT) comparing high (4.5x1014 ions/second) and low (1.7x1011… … Wikipedia
Negative differential conductivity — (NDC) is a nonlinear electrical phenomenon. If J is not a monotonic function of E at some values of E, the conductivity will be negative: and negative differential conductivity is experienced; that is, in some electric field, as the current… … Wikipedia
Negative bias temperature instability — (NBTI) is a key reliability issue in MOSFETs. It is of immediate concern in p channel MOS devices, since they almost always operate with negative gate to source voltage; however, the very same mechanism affects also nMOS transistors when biased… … Wikipedia
Negative luminescence — is a physical phenomenon by which an electronic device emits less thermal radiation when an electric current is passed through it than it does in thermal equilibrium (current off). When viewed by a thermal camera, an operating negative… … Wikipedia
density — [den′sə tē] n. pl. densities [Fr densité < L densitas] 1. the quality or condition of being dense; specif., a) thickness; compactness b) stupidity c) Photog. degree of opacity of a negative 2. quantity or number per unit, as of area … English World dictionary
Negative mass — In theoretical physics, negative mass is a hypothetical concept of matter whose mass is of opposite sign to the mass of the normal matter. Such matter would violate one or more energy conditions and show some strange properties such as being… … Wikipedia
Negative temperature — In physics, certain systems can achieve negative temperatures; that is, their thermodynamic temperature can be a negative quantity. Negative temperatures can be expressed as negative numbers on the kelvin scale. Temperatures that are expressed as … Wikipedia
Negative hyperconjugation — A schematic representation of negative hyperconjugation. In real systems, several of the hydrogens are replaced with other functional groups. In organic chemistry, negative hyperconjugation is the donation of electron density from a filled π or p … Wikipedia
Negative index metamaterials — A negative index metamaterial causes light to refract, or bend, differently than in more common positive refractive index materials. Negative index metamaterials or negative index materials (NIM) are artificial structures where the refractive… … Wikipedia
Density matrix — Mixed state redirects here. For the psychiatric condition, see Mixed state (psychiatry). In quantum mechanics, a density matrix is a self adjoint (or Hermitian) positive semidefinite matrix (possibly infinite dimensional) of trace one, that… … Wikipedia
density — /den si tee/, n., pl. densities. 1. the state or quality of being dense; compactness; closely set or crowded condition. 2. stupidity; slow wittedness; obtuseness. 3. the number of inhabitants, dwellings, or the like, per unit area: The… … Universalium
