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Stray currents, similarly to the noise level or electromagnetic wave emission, belong to physical factors affecting the state of the natural environment. Hazards to the natural environment have been shown, which can be caused by corrosion breakdowns of industrial structures caused by stray currents. Issues connected with stray currents have been discussed. Their sources and the corrosion hazard caused by these currents have been characterised. Anticorrosion protection methods have been presented of metal structures subjected to the harmful interaction of stray currents.
Typical methods have been characterised of determination of the corrosion hazard caused by stray currents to metal structures transporting or storing aggressive media (e.g. fuel pipelines, tanks). Monitoring of the hazard allows determination of its extent, facilitates choice of the most appropriate anticorrosion protection method individually for each structure, and also enables evaluation of the effectiveness of a functioning protective installation. In the paper the practicability of the above mentioned methods has been assessed. Application of methods leading to erroneous conclusions regarding the corrosion hazard of electrolytic corrosion in relation to real electrode processes occurring on the metallic surface of the structure can lead to dangerous consequences. The effect of corrosion processes is the corrosive perforation of the metal leading to leakage to the ground of aggressive media contaminating the natural environment. Seeking of new unequivocal methods regarding electrolytic corrosion processes proceeding on structures is a fundamental issue.
There grounded the frequency range choice in the system of the operation reliability of the technical systems based on the application of probabilistic – statistical method.
The capability of reduction of oxidized sulphur compounds (sulphates, sulphites and thiosulphates) by wild strains of sulphate reducing bacteria (SRB) Desulfovibrio desulfuricans DV-5/86 and Desulfotomaculum nigriflcans DT-5/86 was estimated basing on dynamics of hydrogen sulphide liberation. The effectiveness of these processes was correlated with the biocorrosion rate of metallic copper in artificial aqueous media containing above mentioned substrates. It was demonstrated that corrosive aggressiveness of used media with selected sulphur compounds and investigated bacteria strains were the highest in the presence of S2O3-2 ions and the lowest in the system containing SO4-2 ions.
The blood supply of myomatous uteri collected upon autopsy was examined. The uterine vascular beds were perfused via afferent vessels with fixative followed by Mercox resin and corroded after polymerisation of the resin. The vascular casts thus obtained were examined using scanning electron microscopy. The vascular system of the uterine fibroids was also examined using immunohistochemical analysis (FVIII, factor VIII-related antigen).
Al alloys find a wide spectrum of industrial applications due to their interesting physico-chemical and mechanical properties such as density, good appearance, corrosion resistance and density to strength ratio. Alloying elements in aluminum are aimed at improving its functional properties, especially durability. However, improved durability is not always associated with maintenance of good properties of passive layer responsible for corrosion properties of aluminum. In order to check its corrosion resistance Al-Mg alloys (5182) of commercially pure type - alloy 1100 have been examined. Pitting corrosion investigations of Al-Mg alloys in 0.5M NaCl have been performed by means of dynamic electrochemical impedance spectroscopy under linear potential change conditions.
A method of detection of electric field using the Short Time Fourier Transformation (STFT) is presented. This particular kind of signal analysis makes the determination of changes of the spectral power density of a signal (e.g. structure to electrolyte potential) in function of time possible. The results of joint time-frequency analysis of the potential in the stray currents field are presented. The spectrogram is a composition of spectral lines of defined frequency distribution. A good correlation of localization of spectral lines corresponding to stray current generator and construction potential in time domain is visible. The comparison of time and frequency localization of peaks from spectrograms is unambiguous evidence that the stray current field interfered on the investigated construction. A presented result unambiguously shows the possibility of accurate identification of source of stray currents and its interference on the metal construction.
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