排序方式： 共有53条查询结果，搜索用时 0 毫秒
51.
An alternative approach is suggested to determine the spot-size of a multi-mode laser beam. It has been shown by simulations
that the suggested approach can give the beam quality factor and characteristic radius with less than 5% error. Unlike the
power content method, the proposed method is applicable to the beams even with diameter one tenth of the CCD size. The new
approach has been applied to a multi-mode diode laser output and it is shown that the ABCD matrix analysis can be used for beam propagation, with the measured parameters of the laser. 相似文献
52.
Paul K. Hansma 《Solid State Communications》1973,13(3):397-400
Thin film, macroscopic arrays of superconducting particles 100–10,000 Å in diameter can be produced by evaporating the superconductor in a gas at low pressure. The arrays have a critical supercurrent, Ic, which is a sensitive, multiply periodic function of the applied magnetic field. A simple model of multiple current paths through the array is proposed to explain both this observation and the general shape of the current-voltage characteristics. 相似文献
53.
We report on various microscopic investigations of the specific recognition and binding reaction between a biotinylated lipid layer and streptavidin. First, we present fluorescence microscopic evidence for the preferential adsorption of the protein to only the fluid matrix of a monolayer at the water-air interface if the latter is compressed to the phase transition region where crystalline domains coexist with expanded phase. Surface plasmon microscopy shows that this selectivity is preserved also if the monofilm is first transferred to a solid support (but still in contract with the aqueous phase) and then exposed to a streptavidin-containing solution. Finally, atomic force microscopic pictures taken at the monolayer-electrolyte interface are presented that confirm this preferential binding. 相似文献