Surface意思

Indian Energy advected to and from the lake by precipitationsurface water, and ground water surface意思 little effect on evaporation rates. North American It enters the soilsurface water and eventually the ground water. New Zealand The reservoirs store rainwatergroundwatersurface意思, and surface water until water is needed on the field. North American surface意思.

Add to word list Add to word list. B2 [ C ] the outer or top part or layer of something:. Tropical rain forests used to cover ten percent of the earth's surface. The marble has a smooth , shiny surface. Neil Armstrong was the first person to set foot on the surface of the moon. Don't put anything wet on a polished surface, or it will leave a mark. She watched the sunlight dancing on the water's surface.

Surface意思

Surface states are electronic states found at the surface of materials. They are formed due to the sharp transition from solid material that ends with a surface and are found only at the atom layers closest to the surface. The termination of a material with a surface leads to a change of the electronic band structure from the bulk material to the vacuum. In the weakened potential at the surface, new electronic states can be formed, so called surface states. The allowed wave numbers for a given potential are found by applying the usual Born—von Karman cyclic boundary conditions. Consequently, if the cyclic boundary conditions are abandoned in the direction normal to the surface the behavior of electrons will deviate from the behavior in the bulk and some modifications of the electronic structure has to be expected. A simplified model of the crystal potential in one dimension can be sketched as shown in Figure 1. The step potential solid line shown in Figure 1 is an oversimplification which is mostly convenient for simple model calculations. At a real surface the potential is influenced by image charges and the formation of surface dipoles and it rather looks as indicated by the dashed line. The first type of solution can be obtained for both metals and semiconductors. In semiconductors though, the associated eigenenergies have to belong to one of the allowed energy bands. The second type of solution exists in forbidden energy gap of semiconductors as well as in local gaps of the projected band structure of metals. It can be shown that the energies of these states all lie within the band gap. As a consequence, in the crystal these states are characterized by an imaginary wavenumber leading to an exponential decay into the bulk.

The result is a state localized at the surface decaying surface意思 into the crystal and the vacuum. In contrast with its surface fleet, surface意思, Britain's submarine force was relatively small.

We'll need a flat surface to play the game on. Teeth have a hard surface layer called enamel. These plants float on the surface of the water. She's cleaned all the kitchen surfaces. Rage bubbled just below the surface of his mind. It seems like a good idea on the surface but there are sure to be problems.

Add to word list Add to word list. B2 [ C ] the outer or top part or layer of something. The marble has a smooth , shiny surface. Neil Armstrong was the first person to set foot on the surface of the moon. Don't put anything wet on a polished surface, or it will leave a mark. She watched the sunlight dancing on the water's surface.

Surface意思

The surface of something is the flat top part of it or the outside of it. Ozone forms a protective layer between 12 and 30 miles above the Earth's surface. A work surface is a flat area, for example the top of a table, desk, or kitchen cupboard, on which you can work.

Another word for proximity

Within the crystal the potential is assumed periodic with the periodicity a of the lattice. Tropical rain forests used to cover ten percent of the earth's surface. On the surface , these people seem to be very lucky in life. He never surfaces until at least Consequently, if the cyclic boundary conditions are abandoned in the direction normal to the surface the behavior of electrons will deviate from the behavior in the bulk and some modifications of the electronic structure has to be expected. During hiatuses in deposition, relatively mature vegetation colonized sediment surfaces. Phytoplankton live at the ocean surface , where they pull carbon dioxide into the ocean while giving off oxygen. March 11, Read more. Bibcode : JPhCS.. Indian 2. These animals typically live between the surface of the ocean and a depth of about 3, feet—as far as most light can reach.

These may bind to receptor molecules on the surfaces of cells. The volume of gas trapped on these surfaces can be considerable. The two surfaces adhered, and we couldn't get them apart.

It can be shown that the matching conditions can be fulfilled for every possible energy eigenvalue which lies in the allowed band. This state is either a band-edge state or a surface state in the band gap see, Particle in a one-dimensional lattice , Particle in a box. What time do you surface? Your feedback will be reviewed. North American Toshiba Electronics has introduced two surface-mount chipsets that are claimed to simplify the task of designing CD modules for use in vehicle audio applications. English—Swedish Swedish—English. Back in Britain, things appear, on the surface , simpler Paul Noble Method. When you land in the airport , look for signs directing you to surface transportation to get a bus to the city. In contrast to the nearly free electron model used to describe the Shockley states, the Tamm states are suitable to describe also transition metals and wide-bandgap semiconductors. Conngratulating someone shows you care about their successes or life events. English images. They say they're unsure whether the deep-sea warming canceled out warming at the sea's surface. The energy levels of such states are expected to significantly shift from the bulk values.