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Measurements of the electrical parameters for different water samples
, Article Measurement: Journal of the International Measurement Confederation ; Volume 44, Issue 10 , 2011 , Pages 2175-2184 ; 02632241 (ISSN) ; Sharif University of Technology
Abstract
The resistance and capacitance values of the water samples are measured by using two different cell probes (length 10 cm and 5 cm) and a measuring module. Measured conductivities for the different water samples are compared where the lowest conductivity is obtained for the distilled water (3.28 μS/cm) and the highest value is for the boiled water 325.91 μS/cm. Using the measured series resistance values, and by knowing the frequency (1 kHz), the imaginary part of permittivity value is also determined. The imaginary part of the permittivity for the distilled water with the long cell probe is about 0.524 × 10 -7 F/m (for the short probe is 0.523 × 10-7 F/m) while for the boiled water sample is...
Interpretation of CPT in unsaturated sands under drained conditions: A numerical study
, Article International Journal for Numerical and Analytical Methods in Geomechanics ; Volume 45, Issue 18 , 2021 , Pages 2732-2755 ; 03639061 (ISSN) ; Ahmadi, M. M ; Sharif University of Technology
John Wiley and Sons Ltd
2021
Abstract
A finite difference-based numerical model simulating the cone penetration process in unsaturated sands is presented. Mohr–Coulomb model (MCM) with simple modifications and Sun model (SM) were implemented to capture the unsaturated sand behaviour. It was shown that the cone tip resistance values resulting from the two models were fairly comparable. Predicted cone tip resistance values in dry, saturated and unsaturated sands using MCM were validated by the results of field and calibration chamber tests. Sensitivity analyses were performed, and the influence of parameters including relative density, mean effective stress and apparent cohesion due to suction on the tip resistance was...
Detection and analysis of corrosion and contact resistance faults of tin and crn coatings on 410 stainless steel as bipolar plates in PEM fuel cells
, Article Sensors ; Volume 22, Issue 3 , 2022 ; 14248220 (ISSN) ; Kashyzadeh, K. R ; Borjali, A ; Ivanov, A ; Jafarnode, M ; Gan, T. H ; Wang, B ; Chizari, M ; Sharif University of Technology
MDPI
2022
Abstract
Bipolar Plates (BPPs) are the most crucial component of the Polymer Electrolyte Membrane (PEM) fuel cell system. To improve fuel cell stack performance and lifetime, corrosion resistance and Interfacial Contact Resistance (ICR) enhancement are two essential factors for metallic BPPs. One of the most effective methods to achieve this purpose is adding a thin solid film of conductive coating on the surfaces of these plates. In the present study, 410 Stainless Steel (SS) was selected as a metallic bipolar plate. The coating process was performed using titanium nitride and chromium nitride by the Cathodic Arc Evaporation (CAE) method. The main focus of this study was to select the best coating...