Computer Networking and the Internet (5th Edition) by Fred Halsall

By Fred Halsall

A transparent, present and entire advent to desktop networking from a hugely revered writer whose prior versions have bought over 240,000 copies ? now supported via a wealthy set of assets in a web learn advisor.

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All products are manufactured from atoms, however, interestingly, the properties of those products depend on how those atoms are arranged. For example, by rearranging the atoms in coal (carbon), one can make diamonds. It should be noted that current manufacturing techniques are very rudimentary at the atomic/molecular level: casting, grinding, milling, and even lithography move atoms in bulk rather than in a “choreographed” or “highly controlled” fashion. ), within the constraints of the laws of physics, but in ways that may not occur naturally or in ways to create some existing structure but by synthesizing it out of cheaper forms or constituent elements.

6726231 ϫ 10Ϫ24 g, a diameter of the order of 1 ϫ 10Ϫ15 m, and a positive charge; neutrons, which have approximately the same mass as the proton and a diameter of the order of 1 ϫ 10Ϫ15 m but have no charge; electrons (already discussed), which are small (about 1/2000 mass of proton), have BASIC SCIENCE 29 a diameter of the order of 1 ϫ 10Ϫ18 m, and have negative charge; and photons, the carrier particle of electromagnetic interactions, moving at the speed of light (299, 792,460 m/s). The nucleus, which comprises most of the mass of an atom (but encompasses only a small part of atom’s volume), contains protons and neutrons.

QDs are grouping of atoms so small that the addition or removal of an electron will change its properties in a significant way [36]. QDs are small devices fabricated in semiconductor materials that contain a tiny droplet of free electrons; the size and shape of these structures and, hence, the number of electrons they contain, can be precisely controlled; a QD can have from a single electron to a collection of several thousands [43, 44]. 6 (Continued) Quantum effect Quantum electronics Quantum optics Quantum physics Quantum theory Quantum well (QW) Quantum wire Properties of transistors and wires become altered at the nanoscale level, so that they can no longer be characterized by classical electronic circuit theory.

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