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Riding on the rooftop of a hopper car. Typically, hoppers will go to a rail yard where trains stop to pick up and unload freight and switch out crew. They will either board a freight car in some fashion unseen or “catch one on the fly” once it has begun to move. [2] Train surfing is a similar activity that involves the act of riding on the ...
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. The two different mechanisms result in different charge mobilities. In disordered solids, disordered potentials result in weak localization effects (traps), which reduce the ...
Openclipart, also called Open Clip Art Library, is an online media repository of free-content vector clip art. The project hosts over 160,000 free graphics and has billed itself as "the largest community of artists making the best free original clipart for you to use for absolutely any reason". The website was brought down for several months by ...
Surface hopping is a mixed quantum-classical technique that incorporates quantum mechanical effects into molecular dynamics simulations. [1][2][3][4] Traditional molecular dynamics assume the Born-Oppenheimer approximation, where the lighter electrons adjust instantaneously to the motion of the nuclei. Though the Born-Oppenheimer approximation ...
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Clip art (also clipart, clip-art) is a type of graphic art. Pieces are pre-made images used to illustrate any medium. Today, clip art is used extensively and comes in many forms, both electronic and printed. However, most clip art today is created, distributed, and used in a digital form. Since its inception, clip art has evolved to include a ...
Hopscotch is a popular playground game in which players toss a small object, called a lagger, [1][2] into numbered triangles or a pattern of rectangles outlined on the ground and then hop or jump through the spaces and retrieve the object. [3] It is a children's game that can be played with several players or alone. [4]
The Hubbard model is an approximate model used to describe the transition between conducting and insulating systems. [1] It is particularly useful in solid-state physics. The model is named for John Hubbard. The Hubbard model states that each electron experiences competing forces: one pushes it to tunnel to neighboring atoms, while the other ...