Nonlinear structure of electrical noise of slow electrochemical discharge is analyzed within theory of integral random homogeneous fluxes with independent increments. It is shown that the degree of deviation of a flux of elementary acts from the Poissonian flux is defined by the magnitude of the factor of symmetry of slow discharge. An equation that links polyspectra of slow discharge of first, second, and third orders is derived. 相似文献
The changes in emission characteristics of a neon hollow cathode discharge by resonant laser excitation of 1s5→2p2 and 1s5→2p4 transition have been studied by simultaneously monitoring the optogalvanic effect and the laser induced fluorescence. It
has been observed that resonant excitation causes substantial variation in the relative intensities of lines in the emission
spectrum of neon discharge. 相似文献
We report the thin film deposition by matrix-assisted pulsed laser evaporation (MAPLE) of a polymer conjugate with an hydrophilic sequence between metronidazole molecules that was covalently attached to both oligomer ends of carboxylate poly(ethylene glycol) (PEG 1.5-metronidazole). A pulsed KrF* excimer laser was used to deposit the drug-polymer composite films. Fourier transform infrared spectroscopy was used to demonstrate that MAPLE-transferred materials exhibited chemical properties similar to the starting materials. The dependence of the surface morphology on incident laser fluence is given. 相似文献
Pulsed-wire anemometry was first developed as a tool for making velocity and turbulence measurements in the late 1960s. It has been continuously refined and its potential exploited by a number of groups who have obtained reliable data in situations where the use of other techniques would have been extremely difficult. The technique is particularly useful in flows of high turbulence intensity and has therefore been used to greatest effect in separated flows. Although its range of applicability is much more restricted than that of laser-Doppler anemometry, it is an order of magnitude cheaper, and it does not require seeding of the flow, with all the attendant uncertainties.
First the physical basis of pulsed-wire anemometry is briefly described, and the major sources of experimental error are outlined for cases in which the technique is used both remote from and close to walls. Progress in the design of probes, which have been improved in a number of ways since the early days to reduce errors, is also outlined. The author then reviews the kinds of measurements that have been successfully made and the consequent improvements in the understanding of the physics of complex flows. Examples are drawn from a wide range of work, including some unusual applications like measurements in very low velocity gas mixtures. The paper closes with a summary of the limitations of the technique and an overall assessment of the likely potential for its use in future turbulence research. 相似文献