1,720,966 research outputs found
Validation of a CV simulator for CEC mechanism. An Excel TM procedure for EC/CE analytical solutions
No full textStarting from a previous work, a simulator of the behaviour of two CEC reactions in cyclic voltammetry has been implemented to be used for complexation reactions kinetic studies. The simulator has been validated against integral solutions of the differential equations when available. By using tables reported in the literature for such integral solutions, some failures have been observed. To overcome this problem the numerical calculation of integrals has been repeated and implemented in the Excel? 7.0 environment. This implementation may become a useful tool for other researchers and teachers
Geometric information available from cyclic voltammetry peaks. NLLSRC fitting on EC/CE simulated systems and test on a real system
No full textA general CV peak fitting method based on the NLLSRC algorithm was implemented and its capability to provide geometrical shape parameters, correlable to kinetic, thermodynamic and operational quantities, was tested, both on simulated and real data sets. As in XPS and in DTA/DSC a base line proportional to peak area was tested, even if no theoretical support seems to be available in an electrochemical environment. Using a phoenomenological approach, the empirical validity of such a simple baseline was noted and a quantitative procedure based on area measurements was found to be more precise and easier than usual methods
ACTIVATION OF CARBON FIBRES BY NEGATIVE D.C. CORONA DISCHARGE AT AMBIENT PRESSURE AND TEMPERATURE.
No full textAfter a suitable cleaning treatment, high modulus, unsized, polyacrylonitrile-derived carbon fibres were surface-treated by negative d.c. corona discharges under a flow of various nitrogen/oxygen mixtures at ambient pressure and temperature. The surface composition and morphology of the fibres, characterized before and after the treatment by X-ray photoelectron spectroscopy, X-ray excited Auger spectroscopy and scanning electron microscopy, were influenced by several experimental parameters (applied potential gaseous atmosphere, time of treatment, geometry of the corona apparatus, post-treatment storage conditions, etc.). The matter is discussed in the light of previously published information
A Survey about User Experience Improvement in Mobile Proximity Payment
No full textIn this paper we intend to investigate the problem of the mass adoption of new payment instruments, such as Near Field Communication enabled mobile phones, by analyzing the results of the survey on Mobile Payment in Italy conducted by the "Center of Expertise on Technological Innovation" of CATTID (Centre for Application of Tele services and Technologies for Innovation in Digital world), Sapienza University of Rome. By working at CATTID as specialized researchers on the NFC technology, now that NFC is getting increasingly attention from a commercial point of view, we want to deepen the matters of the users wants and needs about mobile payment, with a view to its wide mass adoption. The method of investigation we chose has been both qualitative and quantitative. From our study, focused on Italian users, we have found that, although users are ready to adopt mobile payment instruments, the market scenario is not growing so fast and the difference will be made by the level of confidence in the financial transaction perceived by consumers. On this, NFC technology is on the good way and we can imagine possible evolution in the security and marketing fields
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