The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Xinhong Wang - One of the best experts on this subject based on the ideXlab platform.
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study of interaction between ionic liquids and orange g in aqueous solution with uv vis spectroscopy and Conductivity Meter
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2018Co-Authors: Xinhong WangAbstract:Abstract The interactions between Orange G (OG) with three kinds of ionic liquid surfactants (C10mimBF4, C12mimBF4, C16mimBF4) and CTAB were studied with UV–Vis spectra and Conductivity measurements. The systematic changes in UV–Vis spectra with an increase of carbon-chain length may be observed in presence of OG. They correspond to CMC of every system, respectively, and the CMCs of four systems have exhibit the decrease of CMCs compared to pure surfactant. The binding constants are calculated from the results of Conductivity measurements in the order of C16mimBF4 > CTAB > C12mimBF4 > C10mimBF4. Furthermore, system behaviors presented significant association of complex formation and micelles formation, i.e. the change in UV–Vis spectra before and after the formation of micelles in mixed systems. In addition, Fourier-transform infrared (FT-IR) spectroscopy and 1H NMR analysis further confirmed that the complexes are formed by hydrogen bond and van der Waal force. These findings could provide scientific guidance for extraction and separation of dyes.
K Kaita - One of the best experts on this subject based on the ideXlab platform.
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response of electromagnetic Conductivity Meter to soil salinity and soil water content
Journal of Irrigation and Drainage Engineering-asce, 1997Co-Authors: B R Hanson, K KaitaAbstract:The effect of soil salinity and soil-water content on the apparent soil electrical Conductivity as measured with the EM-38 electromagnetic Conductivity Meter has been investigated. Results showed substantial changes in the Meter's readings as soil-water content changed. The higher the soil salinity, the more sensitive the Meter's readings were to changes in soil-water content. A linear relationship existed between soil-water content and apparent electrical Conductivity for each level of soil salinity over the range of measured soil-water contents.
C Y Zhao - One of the best experts on this subject based on the ideXlab platform.
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Thermal property investigation of aqueous suspensions of microencapsulated phase change material and carbon nanotubes as a novel heat transfer fluid
Renewable Energy, 2013Co-Authors: G. H. Zhang, C Y ZhaoAbstract:In this paper, a water based suspension containing microencapsulated phase change material (MEPCM) and multi-walled carbon nanotubes (MWCNTs) was prepared as a novel heat transfer fluid. Thermal and rheological properties of the sample were obtained experimentally from differential scanning caloriMeter (DSC), thermal gravimetric analysis (TGA), thermal Conductivity Meter and rheoMeter. It is found that the addition of MWCNTs into microencapsulated phase change material slurry can effectively improve the thermal Conductivity of the suspensions and it is also found that a blend of 10wt. % MEPCMs and 1wt. % MWCNTs suspension can achieve an optimal thermal performance and stability. ?? 2013 Elsevier Ltd.
Chee-earn Chong - One of the best experts on this subject based on the ideXlab platform.
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A New Geometric Factor for In Situ Resistivity Measurement Using Four Slender Cylindrical Electrodes
IEEE Transactions on Biomedical Engineering, 2008Co-Authors: Chee-earn ChongAbstract:The four-electrode method is commonly used for in situ measurement of the electrical resistivity of biological tissues. In this paper, a new geometric factor between the resistivity and measured resistance using the four-electrode interface is derived in the prolate spheroidal coordinates and experimentally validated. Evaluation of the experimental results shows that the resistivities determined using both the derived geometric factor and a commercial Conductivity Meter are in close agreement even when the length of the immersed electrodes becomes long with respect to the inter-electrode spacing. The evaluation also shows the effect of the relative size of the sample volume when the limitation to semi-infinite volume begins to result in poor accuracy.
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Resistivity Measurement of a Small-Volume Sample Using Two Planar Disc Electrodes and a New Geometric Factor
IEEE Sensors Journal, 2008Co-Authors: Chee-earn ChongAbstract:In this work, we derive a new geometric factor in oblate spheroidal coordinates for Conductivity or resistivity measurements using two planar disc electrodes based on the electromagnetic field theory and neglecting the electrode polarization effects. The experiments were conducted on saline solutions contained in a grounded metallic bath to validate the obtained values of the derived geometric factor. The effect of the polarization impedance at the electrodes is found to be negligible when using relatively nonpolarizable silver-silver chloride electrodes at a frequency of 3 kHz. Our experimental results also show that the resistivity values determined using both the new geometric factor and a commercial Conductivity Meter are in good agreement for small electrode radius, interelectrode spacing and depth of sample, therefore making it a promising technique for applications in microfluidics devices. The effects of current density and temperature on the measurement results are also presented.
Jan M. H. Hendrickx - One of the best experts on this subject based on the ideXlab platform.
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Noninvasive Soil Water Content Measurement Using Electromagnetic Induction
Water Resources Research, 1995Co-Authors: Keith R. Sheets, Jan M. H. HendrickxAbstract:The feasibility of soil water content measurement using electromagnetic induction was investigated in an arid region of southern New Mexico. Soil water measurements were taken monthly with a neutron probe at 65 equally spaced stations along a 1950-m transect. At the same time, noninvasive electrical Conductivity measurements of the soil were taken with a Geonics EM-31 ground Conductivity Meter. Using 16 months of measurements, we found a linear relationship exists between bulk soil electrical Conductivity and total soil water content in the top 1.5 m of the profile. A simple linear regression model was developed to describe the relationship between soil water content and bulk soil electrical Conductivity. The spatial and temporal accuracy of the regression model is addressed as well as the total number of neutron access tubes needed to accurately calibrate the model. By comparison with the neutron scattering method the electromagnetic induction method is quite accurate for the prediction of water content changes over time. The speed and ease of use combined with the accuracy of the measurements make the ground Conductivity Meter a valuable tool for rapid, noninvasive soil water measurements.