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    Modeling, simulation, and optimal initiation planning for needle insertion into the liver

    , Article Journal of Biomechanical Engineering ; Volume 132, Issue 4 , 2010 ; 01480731 (ISSN) Sharifi Sedeh, R ; Ahmadian, M. T ; Janabi Sharifi, F ; Sharif University of Technology
    Needle insertion simulation and planning systems (SPSs) will play an important role in diminishing inappropriate insertions into soft tissues and resultant complications. Difficulties in SPS development are due in large part to the computational requirements of the extensive calculations in finite element (FE) models of tissue. For clinical feasibility, the computational speed of SPSs must be improved. At the same time, a realistic model of tissue properties that reflects large and velocity-dependent deformations must be employed. The purpose of this study is to address the aforementioned difficulties by presenting a cost-effective SPS platform for needle insertions into the liver. The study... 

    Performance optimization of microreactors by implementing geometrical and fluid flow control in the presence of electric field: a computational study

    , Article Microsystem Technologies ; Volume 21, Issue 6 , 2014 , Pages 1275-1285 ; ISSN: 09467076 Shamloo, A ; Sharifi, F ; Salehi, S. S ; Amirifar, L ; Firoozabadi, B ; Sharif University of Technology
    A two dimensional rectangular microchannel with circular micropillars was modeled in the presence of an electric field. Continuity and Navier-Stokes equations were solved along with convection-diffusion equation using finite element method. Reaction phenomenon was applied via a partial differential equation on the reaction surfaces and electric force was added as a source term to the transport equations. Velocity, concentration and electric potential distributions were obtained, with the aid of which, capture efficiency and average surface concentration of reaction surfaces were calculated. To ameliorate the reaction rate, different designs of reaction surfaces were investigated; the designs... 

    Optimization of highly conductive insert architecture for cooling a rectangular chip

    , Article International Communications in Heat and Mass Transfer ; Volume 39, Issue 8 , 2012 , Pages 1265-1271 ; 07351933 (ISSN) Mazloomi, A ; Sharifi, F ; Salimpour, M. R ; Moosavi, A ; Sharif University of Technology
    Elsevier  2012
    Conductive cooling of a rectangular chip heated from the bottom surface and connected to a heat sink is studied. Different configurations of a highly conductive material embedded in the chip are investigated and an optimal configuration for transferring heat to the heat sink is achieved. Our results indicate that the optimal configuration can be obtained by using side branches, parallel with the main channel, and also increasing the thickness of the main channel. Many complex configurations are checked and it is shown that these structures do not provide better performance  

    Flow mediated dilation with photoplethysmography as a substitute for ultrasonic imaging

    , Article Physiological Measurement ; Volume 36, Issue 7 , 2015 , Pages 1551-1571 ; 09673334 (ISSN) Mashayekhi, G ; Zahedi, E ; Movahedian Attar, H ; Sharifi, F ; Sharif University of Technology
    Institute of Physics Publishing  2015
    Flow mediated dilation (FMD) is a non-invasive method for endothelial function assessment providing an index extracted from ultrasonic B-mode images. Although utilized in the research community, the difficulty of its application and high cost of ultrasonic devices prevent it from being widely used in clinical settings. In this study we show that substituting the ultrasonic device with more easily handled and low cost photoplethysmography and electrocardiography is possible. We introduce new indices based on the photoplethysmogram (PPG) and electrocardiogram (ECG) and show that they are correlated with the ultrasound-based FMD Index. To this end, a conventional ultrasound FMD test was carried... 

    A novel niosome formulation for encapsulation of anthocyanins and modelling intestinal transport

    , Article Food Chemistry ; Volume 293 , 2019 , Pages 57-65 ; 03088146 (ISSN) Fidan Yardimci, M ; Akay, S ; Sharifi, F ; Sevimli Gur, C ; Ongen, G ; Yesil Celiktas, O ; Sharif University of Technology
    Elsevier Ltd  2019
    The bioavailability of drugs can be improved by regulating the structural properties, particularly lipoid systems, such as niosomes, can increase cellular uptake. Herein, we optimized double emulsion and niosomal formulations for encapsulating anthocyanin-rich black carrot extract. Nanoparticles obtained by selected formulation were characterized in terms of morphology, particle size, drug encapsulation efficiency, in vitro release and cytotoxicity. The optimum conditions for niosomal formulation were elicited as 30 mg of cholesterol, 150 mg of Tween 20 and feeding time of 1 min at a stirring rate of 900 rpm yielding the lowest average particle size of 130 nm. In vitro release data showed... 

    Microfluidic manipulation of Core/Shell nanoparticles for oral delivery of chemotherapeutics: A new treatment approach for colorectal cancer

    , Article Advanced Materials ; Volume 28, Issue 21 , 2016 , Pages 4134-4141 ; 09359648 (ISSN) Hasani Sadrabadi, M. M ; Taranejoo, S ; Dashtimoghadam, E ; Bahlakeh, G ; Majedi, F.S ; Vandersarl, J. J ; Janmaleki, M ; Sharifi, F ; Bertsch, A ; Hourigan, K ; Tayebi, L ; Renaud, P ; Jacob, K. I ; Sharif University of Technology
    Wiley-VCH Verlag 
    A microfluidics approach to synthesize core-shell nanocarriers with high pH tunability is described. The sacrificial shell protects the core layer with the drugs and prevents their release in the severe pH conditions of the gastrointestinal tract, while allowing for drug release in the proximity of a tumor. The proposed nanoparticulate drug-delivery system is designed for the oral administration of cancer therapeutics  

    3D-Printed Sugar-Based Stents Facilitating Vascular Anastomosis

    , Article Advanced Healthcare Materials ; 2018 ; 21922640 (ISSN) Farzin, A ; Miri, A. K ; Sharifi, F ; Faramarzi, N ; Jaberi, A ; Mostafavi, A ; Solorzano, R ; Zhang, Y. S ; Annabi, N ; Khademhosseini, A ; Tamayol, A ; Sharif University of Technology
    Wiley-VCH Verlag  2018
    Microvascular anastomosis is a common part of many reconstructive and transplant surgical procedures. While venous anastomosis can be achieved using microvascular anastomotic coupling devices, surgical suturing is the main method for arterial anastomosis. Suture-based microanastomosis is time-consuming and challenging. Here, dissolvable sugar-based stents are fabricated as an assistive tool for facilitating surgical anastomosis. The nonbrittle sugar-based stent holds the vessels together during the procedure and are dissolved upon the restoration of the blood flow. The incorporation of sodium citrate minimizes the chance of thrombosis. The dissolution rate and the mechanical properties of... 

    Drug delivery systems and materials for wound healing applications

    , Article Advanced Drug Delivery Reviews ; Volume 127 , 2018 , Pages 138-166 ; 0169409X (ISSN) Saghazadeh, S ; Rinoldi, C ; Schot, M ; Saheb Kashaf, S ; Sharifi, F ; Jalilian, E ; Nuutila, K ; Giatsidis, G ; Mostafalu, P ; Derakhshandeh, H ; Yue, K ; Swieszkowski, W ; Memic, A ; Tamayol, A ; Khademhosseini, A ; Sharif University of Technology
    Elsevier B.V  2018
    Chronic, non-healing wounds place a significant burden on patients and healthcare systems, resulting in impaired mobility, limb amputation, or even death. Chronic wounds result from a disruption in the highly orchestrated cascade of events involved in wound closure. Significant advances in our understanding of the pathophysiology of chronic wounds have resulted in the development of drugs designed to target different aspects of the impaired processes. However, the hostility of the wound environment rich in degradative enzymes and its elevated pH, combined with differences in the time scales of different physiological processes involved in tissue regeneration require the use of effective drug...