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RISS 인기검색어
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- 저자 : Ullah Rahmat (검색결과 2 건)
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Chlorodifluoromethane (R22) Gas and Its Mixtures with CO2/N2/Air as an Alternative to SF6
Saleem Muhammad Zaheer,Kamran Muhammad,Amin Salman,Ullah Rahmat,Abbas Kharal Hafiz Shafqat,Nasimullah,Muhammad Fazal,Rahman Taqi ur 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.3
SF 6 has been extensively deployed in high voltage gas insulated equipment to be used as a dielectric medium since 1960 because of its excellent dielectric strength and arc interruption performance. This research proposes promising substitute of SF 6 , by investigating a refrigerant gas such as Chlorodifl uoromethane (CHClF 2 ) with a mixture of CO 2 /N 2 /Air to mitigate environmental hazards of SF 6 . R 22 has less atmospheric life and low cost as compared to SF 6 . It has less GWP (1,810) as compared to SF 6 (23,900). In this research, the AC and DC breakdown properties of R 22 mixtures along with varying ratios of CO 2 , N 2, and Air were investigated. The best alternative to SF 6 has been found to be a mixture of R 22 + N 2 which is close to 81% of SF 6 dielectric strength. The dielectric strength of diff erent optimal mixtures was found in the order of SF 6 > R 22 + N 2 > R 22 + Air > R 22 + CO 2 under AC voltage at 0.4 MPa. Moreover, the boiling point and GWP were further reduced by adding the buff er gases such as N 2, , CO 2 , and Air. R 22 also has acceptable insulation self-recoverability and liquefaction temperature. The results of this study are promising in terms of low cost and environment-friendly alternative to SF 6 .
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Incidence of Active HCV infection amongst Blood Donors of Mardan District, Pakistan
Karim, Fawad,Nasar, Abu,Alam, Ibrar,Alam, Iftikhar,Hassan, Said,Gul, Rahmat,Ullah, Sana,Rizwan, Muhammad Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.1
Hepatitis C is an ailment of liver caused by hepatitis C virus (HCV) infection. About 3% of the world population is infected by this virus. HCV infection is a leading reason for liver cirrhosis and therefore a major source of hepatocellular carcinoma. The study focused on the incidence of active HCV infection in blood donors of Mardan district of KPK, Pakistan. A total of 5318 blood donors were inspected for the presence of anti-HCV antibodies and HCV-RNA using ICT (immune-chromatographic test), ELISA and RT-PCR at Mardan Medical Complex (MMC), Mardan. Out of these, 157 (2.95%) were positive by ICT, 60 (1.12%) by ELISA and 56 (1.05%) for HCV-RNA. The frequency of active HCV infectivity amongst the blood donors from district Mardan, KPK Pakistan was 1.05 %. Application of strict measures during blood donor selection and use of proper screening assays such as ELISA in place of ICT devices can give a more accurate picture so that the incidence of this viral infection in HCV negative blood recipients can be reduced.
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