Search for: measure-concentration
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    Irregularities of Some Random Point Processes

    , M.Sc. Thesis Sharif University of Technology Zamani, Mohammad Sadegh (Author) ; Alishahi, Kasra (Supervisor)
    The spherical ensemble is a well-studied determinantal process with a fixed number of points on the sphere. The points of this process correspond to the generalized eigenvalues of two appropriately chosen random matrices, mapped to the surface of the sphere by stereographic projection. This model can be considered as a spherical analogue for other random matrix models on the unit circle and complex plane such as the circular unitary ensemble or the Ginibre ensemble, and is one of the most natural constructions of a (statistically) rotation invariant point process with repelling property on the sphere. In this dissertation we study the spherical ensemble and its local repelling property by... 

    Smart chip for visual detection of bacteria using the electrochromic properties of polyaniline

    , Article Analytical Chemistry ; Volume 91, Issue 23 , 2019 , Pages 14960-14966 ; 00032700 (ISSN) Ranjbar, S ; Farahmand Nejad, M. A ; Parolo, C ; Shahrokhian, S ; Merkoci, A ; Sharif University of Technology
    American Chemical Society  2019
    Finding fast and reliable ways to detect pathogenic bacteria is crucial for addressing serious public health issues in clinical, environmental, and food settings. Here, we present a novel assay based on the conversion of an electrochemical signal into a more convenient optical readout for the visual detection of Escherichia coli. Electropolymerizing polyaniline (PANI) on an indium tin oxide screen-printed electrode (ITO SPE), we achieved not only the desired electrochromic behavior but also a convenient way to modify the electrode surface with antibodies (taking advantage of the many amine groups of PANI). Applying a constant potential to the PANI-modified ITO SPE induces a change in their... 

    Experimental investigation of the effect of inlet concentration on the behavior of turbidity currents in the presence of two consecutive obstacles

    , Article Journal of Waterway, Port, Coastal and Ocean Engineering ; Volume 143, Issue 2 , 2017 ; 0733950X (ISSN) Yaghoubi, S ; Afshin, H ; Firoozabadi, B ; Farizan, A ; Sharif University of Technology
    American Society of Civil Engineers (ASCE)  2017
    Turbidity currents are often the main processes of sediment transport in deep waters and reservoirs. To prevent sedimentation in critical locations, various methods, such as placing solid obstacles in the path of these flows, have been proposed. In the present study, the effect of inlet concentration on the behavior of turbidity currents in the presence of two consecutive triangular obstacles was investigated experimentally. For this purpose, a series of laboratory experiments were conducted with various inlet concentrations. In each experiment, velocity and concentration profiles were measured using an acoustic Doppler velocimeter. The velocity of the current head and local Froude number... 

    Radioactivity levels in the mostly local foodstuff consumed by residents of the high level natural radiation areas of Ramsar, Iran

    , Article Journal of Environmental Radioactivity ; Volume 169-170 , 2017 , Pages 209-213 ; 0265931X (ISSN) Fathabadi, N ; Salehi, A. A ; Naddafi, K ; Kardan, M. R ; Yunesian, M ; Nabizadeh Nodehi, R ; Deevband, M. R ; Gooniband Shooshtari, M ; Hosseini, S. S ; Karimi, M ; Sharif University of Technology
    Elsevier Ltd  2017
    Among High Level Natural Radiation Areas (HLNRAs) all over the world, the northern coastal city of Ramsar has been considered enormously important. Many studies have measured environmental radioactivity in Ramsar, however, no survey has been undertaken to measure concentrations in the diets of residents. This study determined the 226Ra activity concentration in the daily diet of people of Ramsar. The samples were chosen from both normal and high level natural radiation areas and based on the daily consumption patterns of residents. About 150 different samples, which all are local and have the highest consumption, were collected during the four seasons. In these samples, after washing and...