单词	line integral
释义	line integral If a vector function V (x,y,z) is defined between two points A and B on a curve, the curve is approximately given by a series of equal directed chords Δ1=,Δ2=,…Δn,= . In each segment i of the curve it is possible to define the scalar product Vi• Δil. If the sum of the scalar products is considered, the line integral is defined by An example of a line integral is given by the case of a force F acting on a particle in the field of the force. The line integral ?ABF•d= is the work done on the particle as it moves from A to B because of the force. If the line integral is taken round a closed path (loop), the line integral is denoted by ?CV•d= or ∮V•dl . A line integral for a scalar function φ(x,y,z) is defined in a similar way and is denoted ?ABφdl . It is also possible to define another type of line integral for a vector function V by ?ABV×dl
随便看	boron counter Bose—Einstein statistics Bose-Einstein condensation boson bosonization bound state boundary layer Bourdon gauge Boyle's law Boyle, Robert Brackett series Bragg's law Bragg, Sir William Henry brass Brattain, Walter Braun, Karl Ferdinand breakdown breaking stress breeder reactor Bremsstrahlung Brewster's law bridge rectifier Brinell hardness Britannia metal British thermal unit

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