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Table of Contents

Sensors, Volume 4, Issue 11 (November 2004), Pages 170-186

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	p. 170-180 Lida Fotouhi, Mahsa Ganjavi and Davood Nematollahi Article: Electrochemical Study of Iodide in the Presence of Phenol and o-Cresol: Application to the Catalytic Determination of Phenol and o-Cresol Sensors 2004, 4(11), 170-180; doi:10.3390/s41100170 Received: 10 May 2004 / Accepted: 25 October 2004 / Published: 30 November 2004 Show/Hide Abstract | Download PDF Full-text (554 KB) Abstract: The electrochemical oxidation of iodide in the presence of phenol and o-cresol was investigated at a glassy carbon electrode in buffered media by cyclic voltammetry, linear sweep voltammetry and controlled–potential coulometry. The experimental results indicate that the phenol and o-cresol convert to their derivatives after participating in a halogenation coupled reaction (quasi-catalytic reaction) following the oxidation of iodide to iodine. The concentrations of phenol and o-cresol have been determined in aqueous solutions according to the linear dependence of quasi-catalytic peak currents with the concentration. The calibration graphs show two linear sections of 0.0 to 1.0×10-4 M and 2.0×10-4 to 1.0 ×10-3 M for phenol and 4.2×10-5 to 1.0×10-4 M and 2.0×10-4 to 1.0×10-3 M for o-cresol. The theoretical detection limits and the relative standard deviations for ten measurements of phenol and o-cresol are 1.125×10-5 M, 1.06% and 4.201×10-5 M, 1.44%, respectively.
	p. 181-186 Michael Segal Article: 2-Sensor Problem Sensors 2004, 4(11), 181-186; doi:10.3390/s41100181 Received: 20 July 2004 / Accepted: 28 November 2004 / Published: 30 November 2004 Show/Hide Abstract | Download PDF Full-text (153 KB) Abstract: Ad-hoc networks of sensor nodes are in general semi-permanently deployed. However, the topology of such networks continuously changes over time, due to the power of some sensors wearing out to new sensors being inserted into the network, or even due to designers moving sensors around during a network re-design phase (for example, in response to a change in the requirements of the network). In this paper, we address the problem of covering a given path by a limited number of sensors — in our case to two, and show its relation to the well-studied matrix multiplication problem.
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