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    Study on commercial membranes and sweeping gas membrane distillation for concentrating of glucose syrup

    , Article Journal of Membrane Science and Research ; Volume 6, Issue 1 , 2020 , Pages 47-57 Shirazi, M. M. A ; Kargari, A ; Bastani, D ; Soleimani, M ; Fatehi, L ; Sharif University of Technology
    Amirkabir University of Technology - Membrane Processes Research Laboratory  2020
    In this work, sweeping gas membrane distillation (SGMD) process was used for concentrating of glucose syrup. The main questions in this work include: is SGMD process practical for concentrating of glucose solution prior the fermentation step in bioethanol process?. and are the commercially available hydrophobic membranes sufficient enough to develop the SGMD process in pilot scale for this issue?. To answer these questions, SGMD process was performed using three commercial membranes made of PP, PVDF and PTFE. All membranes characterized using scanning electron and atomic force microscopes for their morphological and topographical features. Important operating parameters including feed... 

    A 10MHz CTDSM with differential VCO-based quantizer in 90nm

    , Article Proceedings of the 2013 8th International Conference on Design and Technology of Integrated Systems in Nanoscale Era, DTIS 2013 ; 2013 , Pages 128-133 ; 9781467360388 (ISBN) Yousefzadeh, B ; Hajian, A ; Sharifkhani, M ; Sharif University of Technology
    This paper presents a new architecture for VCO-based Continuous Time Delta Sigma Modulators. This approach is based on the differential configuration for the quantizer while maintains its inherent dynamic element matching property. Consuming no additional power and area compared to the conventional scheme, this architecture can eliminate the even orders of harmonic distortion and achieve higher linearity. Theoretical analysis for signal to quantization noise, power and area consumption and mismatch effect is provided. To illustrate the effectiveness of the new architecture in continuous time modulators, a modulator with 640 MHz sampling rate utilizing the mentioned quantizer is simulated in... 

    Production of drinking water from seawater using membrane distillation (MD) alternative: Direct contact MD and sweeping gas MD approaches

    , Article Desalination and Water Treatment ; Vol. 52, issue. 13-15 , Apr , 2014 , p. 2372-2381 Shirazi, M. M. A ; Kargari, A ; Bastani, D ; Fatehi, L ; Sharif University of Technology
    In this work, two-membrane distillation (MD) modes, direct contact MD, and sweeping gas MD were investigated for synthesized and real (Persian Gulf) seawater desalination. A commercial PTFE membrane with 0.22 μm pore size was characterized (using atomic force microscopy and scanning electron microscopy) and was used for experiments. A multipurpose plate and frame MD module was used for desalination experiments. The effects of various operating conditions and MD module design, as well as feed type on the permeation flux have been studied. The feed temperature was found to be the most effective operating parameter. The flow rate in both sides of the MD module was found to be effective;... 

    Cross-layer optimization of adaptive modulation and coding preserving packet average delay time

    , Article 2008 IEEE Global Telecommunications Conference, GLOBECOM 2008, New Orleans, LA, 30 November 2008 through 4 December 2008 ; December , 2008 , Pages 1278-1282 ; 9781424423248 (ISBN) Ghavami Pakdehi, A ; Ashtiani, F ; Sharif University of Technology
    In this paper we introduce a novel cross layer design between MAC and physical layers. Our novel design is based on controlling the adaptive modulation and coding (AMC) transmission mode at the physical layer according to the queue length of finite buffer at the data link layer and each transmission mode of AMC. The aim is optimizing system performance over a wireless link, preserving the important Quality of Service (QoS) parameter, packet average delay time. Analytical expressions such as packet drop probability, channel packet error rate, packet loss rate and packet average delay time are derived both analytically and through simulations according to the system and channel parameters....