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    Investigation of effective parameters on the performance of the helium liquefaction cycle

    , Article International Journal of Heat and Technology ; Volume 37, Issue 4 , 2019 , Pages 1009-1018 ; 03928764 (ISSN) Larijani, M. A ; Eslami, M ; Afshin, H ; Sharif University of Technology
    International Information and Engineering Technology Association  2019
    Abstract
    Due to its unique properties, helium has wide application in different industries and scientific fields, which has turned it into a strategic material. Helium liquefaction plants include wide temperature range from 300 k to 4.2 k, so these plants have high energy consumption. A lot of studies have done to optimize the operation of these cycles. In this research, an exergy analysis is performed for a liquid helium production plant. The optimal performance of 3 and 4 stage cycles is extracted using parametric study and the results are compared with those of Collins dual-expander cycle. The results show that by increasing the number of cooling stages, not only the compressor optimum discharge... 

    Investigation of effective parameters on the performance of the helium liquefaction cycle

    , Article International Journal of Heat and Technology ; Volume 37, Issue 4 , 2019 , Pages 1009-1018 ; 03928764 (ISSN) Larijani, M. A ; Eslami, M ; Afshin, H ; Sharif University of Technology
    International Information and Engineering Technology Association  2019
    Abstract
    Due to its unique properties, helium has wide application in different industries and scientific fields, which has turned it into a strategic material. Helium liquefaction plants include wide temperature range from 300 k to 4.2 k, so these plants have high energy consumption. A lot of studies have done to optimize the operation of these cycles. In this research, an exergy analysis is performed for a liquid helium production plant. The optimal performance of 3 and 4 stage cycles is extracted using parametric study and the results are compared with those of Collins dual-expander cycle. The results show that by increasing the number of cooling stages, not only the compressor optimum discharge... 

    Superconducting compact coplanar waveguide filters based on quarter-wavelength spiral resonators with suppressed slot-line mode

    , Article Electromagnetics ; Volume 34, Issue 1 , 2 January , 2014 , Pages 12-18 ; ISSN: 02726343 Javadzadeh, S. M. H ; Bruno, A ; Farzaneh, F ; Fardmanesh, M ; Sharif University of Technology
    Abstract
    Quarter-wavelength superconducting spiral resonators have been used to realize a coplanar waveguide bandpass filter and bandstop filter around the center frequency of 6 GHz. These compact coplanar waveguide filters have been made from 300-nm-thick NbTiN thin film on a 525-μm-thick silicon substrate. The bandpass filter is a six-pole Chebyshev filter with two zero transmissions due to nonadjacent coupling in its structure. Accurately microfabricated air-bridges have been used to suppress the undesired slot-line mode in this filter. The bandstop filter is a very simple two-pole structure that used wire bonding to suppress the slot-line mode. Measurements have been done at a temperature of 4.2...