- 行业: Education
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A member of the University of Texas System, UT Dallas is a public research university with 125 academic programs offered through its seven schools. Many of the university's strongest and most popular programs are in business, the sciences, and applied sciences. UTD's admissions standards are among ...
The interpenetration of one substance into another as a result of thermal / random motion of the individual particles. (e.g., the diffusion of a plasma across a magnetic field as a result of collisions which cause particles to move onto new field lines. )
Industry:Physics
A daytime layer of the earth's ionosphere approximately 50 to 90 km in altitude.
Industry:Physics
High acceleration of electrons in a collisional plasma caused by a suddenly applied electric field (which greatly reduces the collision cross section of the electrons).
Industry:Physics
Poleward of the diffuse aurora is the region of discrete auroral arcs produced by monoenergetic field-aligned particle beams which create a "bubbling" effect in the E-region at the end of the field lines along which they are traveling.
Industry:Physics
The velocity of a wave disturbance as a whole, i.e., of an entire group of component simple harmonic waves.
Industry:Physics
The separation or branching into two parts, areas, aspects or connected segments, of anatomical systems or functions.
Industry:Physics
Degree to which a substance transmits (conducts) a given physical property, such as heat or electricity.
Industry:Physics
A rapid loss of plasma across magnetic field lines caused by microinstabilities. Theory formulated by the physicist David Bohm. From Chen's book (see references): "Semiempirical formula for the diffusion coefficient given by Bohm in 1946 (noted by Bohm, Burhop, and Massey, who were developing a magnetic arc for use in uranium isotope separation). " Bohm diffusion was proposed (not derived from first principles) to scale as 1/B rather than the 1/B^2 scaling predicted by classical diffusion. A 1/B scaling results from assuming that particles diffuse across field lines at an optimum rate (effective collision frequency=cyclotron frequency). The 1/B scaling is observed (approximately) in most reactors.
Industry:Physics
In atmospheric electricity, the number of ions per unit volume of a given sample of air; more particularly, the number of ions of a given type (positive small ion, negative small ion, positive large ion, or negative large ion) per unit volume of air.
Industry:Physics
A phenomenon occurring in the e region of the ionosphere, which significantly affects HF radiowave propagation. Sporadic E can occur during daytime or nighttime and it varies markedly with latitude.
Industry:Physics
