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121Nuclear fusion — Nuclear physics Radioactive decay Nuclear fission Nuclear fusion Classical dec …
122Photolithography — For earlier uses of photolithography in printing, see Lithography. For the same process applied to metal, see Photochemical machining. Photolithography (or optical lithography ) is a process used in microfabrication to selectively remove parts of …
123Electrical conductivity — or specific conductivity is a measure of a material s ability to conduct an electric current. When an electrical potential difference is placed across a conductor, its movable charges flow, giving rise to an electric current. The conductivity σ… …
124Helium fusion — is a kind of nuclear fusion, with the nuclei involved being helium.The fusion of helium 4 nuclei (alpha particles) is known as the triple alpha process, because fusion of just two helium nuclei only produces beryllium 8, which is unstable and… …
125Heat equation — The heat equation is an important partial differential equation which describes the distribution of heat (or variation in temperature) in a given region over time. For a function of three spatial variables ( x , y , z ) and one time variable t ,… …
126Isotropic etching — In semiconductor technology isotropic etching is non directional removal of material from a substrate via a chemical process using an etchant substance. The etchant may be a corrosive liquid or a chemically active ionized gas, known as a… …
127GeForce 3 Series — NVIDIA GeForce 3 Series Codename(s) NV20 Release date 2001 Entry level GPU None Mid range GPU GeForce 3 Ti 200 High end GPU GeForce 3, Ti 500 Direct3D and shader version D3D 8.0, Pixel Shader 1.1, Vertex Shader 1.1 The GeForce 3 (NV20) is the… …
128Brownian motor — Brownian motors are nano scale or molecular devices by which thermally activated processes (chemical reactions) are controlled and used to generate directed motion in space and to do mechanical or electrical work. These tiny engines operate in an …
