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Articles by G. Behzadi
Total Records ( 4 ) for G. Behzadi
  G. Behzadi and H. Golnabi
  In this study by using a capacitive cell probe the temperature variation of the electrical properties of the water liquids is investigated. Variation of the reactance capacitance parameter of liquids with temperature in the range of 17-60 °C is measured for the plain water and water mixtures. The temperature variations of the capacitance for the cool distilled and tap water samples are studied for the range of 17-29 °C obtained. Present results indicate an averaged variation of 4.69 μF/ °C for the distilled water and 3.24 μF/ °C for tap water in warm up process to a near room temperature. The cooling behaviors for the warm mineral, tap and salt water liquids are also investigated in this study. Average variations of 0.54 μF/ °C for the mineral water, 0.76 μF/ °C for the tap water and 1.44 μF/ °C for the dilute salt water are obtained for the high temperature range. In comparing the results for different liquids, dilute salt water shows a factor of 2.6 increase in measured capacitance in comparison with the mineral water when temperature drops from 60.0 to 35.0 °C. Hence the reported cell probe provides a relatively accurate method to determine the temperature dependence of reactive capacitance for the pure liquids and also liquids with a trace impurity.
  G. Behzadi and H. Golnabi
  In this study by using a Cylindrical Capacitive Sensor (CCS), the Electrical Conductivity (EC), effects on the capacitance measurements of the water liquids was investigated. Theoretical values of the capacitance measurements of water liquids with the cylindrical length in the range 0.5-5 cm are calculated. Our obtained results indicate that measured capacitance value by CCS depends on the liquid capacitance and reactance capacitance. Liquid capacitance value of the distilled water for permittivity of 80 is about 33.5 pF and reactance capacitance value is about 0.290 μF, when the cylindrical length value is about 1.6 cm. The reactance capacitance for the mineral, tap and dilute salt water liquids are also investigated in this study. The reactance capacitance value of 22.80 μF for the mineral water, 37.50 μF for the tap water and 47.80 μF for the dilute salt water obtained when the cylindrical length value is about 1.6 cm. A comparison of our obtained result indicated the liquid capacitance value in the capacitance measurement is negligible. A comparison of the theoretical and experimental values shows that theoretical values are smaller than the experimentally measured values that due to the stray capacitances. The minimum error is about 3.3% for distilled water and maximum error is about 12.9% for salt water. Hence, the reported CCS provides a high sensitivity to determine the reactance capacitance value for the different water liquids with low EC.
  L. Fekri , A. Jafari , S. Fekri , A. Shafikhani , M. Vesaghi and G. Behzadi
  In this study by Thermal Chemical Vapor Deposition (TCVD) method, the synthesis of carbon nanotubes (CNTs) and temperature affects on the grown CNTs on the NiSio2 catalyst and 304-type stainless steel was investigated. The purification of the grown CNTs on the 304-type stainless steel was also investigated in this study. The synthesis and purification of the samples were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), termogravimetric analysis (TGA) and Raman spectroscopy. Our obtained result by SEM and TEM shows that densities of CNTs growth on the 304-type stainless steel are more than the CNTs growth on the NiSio2 catalyst and both of them have a bamboo structure. The synthesis of CNTs in the range 750 to 850°C are also investigated in this study. Optimum temperature for synthesis of CNTs on the NiSio2 catalyst is about 825°C and for the 304-type stainless steel is about 750°C. The purification process includes oxidation in the range 450to 750°C, washing with 5 mol hydrochloric acids, disperse with ultrasonic and filtration. Our obtained result by TGA indicates that the CNTs burn in 600°C. A comparison of the Raman spectroscopy before and after of purification shows that the D-band shape is less than the G-band that due to the samples purified. Hence, the reported 304-type stainless steel provides a good sample for synthesis of CNTs by TCVD method.
  G. Behzadi , L. Fekri and H. Golnabi
  In this study, operation of the contact Cylindrical Capacitive Sensor (CCS) for the reactance capacitance measurement of the water liquids by using the charge/discharge measurement module is investigated. The effect of geometric factor on the capacitance measurement of different liquid samples is also studied. The measured capacitances for the distilled, mineral, tap and salt water samples are reported by using two contact CCSs with the active length of 16 and 74 mm. The measured capacitances by small contact CCS for the salt water is 1.76 μF and by big contact CCS is 47.8 μF, which shows a big difference for different probes. In another study, the effects of the liquid conductance on the capacitance values are theoretically investigated. The obtained results for different water liquids show that by increasing the conductance of the sample liquids both the stream discharge current and the stored load charge on the cylindrical electrodes are decreased, accordingly.
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