Browsing by Author "Hassan H.A."

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    Chemical and biological investigation of essential oil of oroxylum indicum L. Leaves cultivated in Egypt
    (International Journal of Pharmacognosy and Phytochemical Research, 2015) Zaghloul S.S.; Azzam S.M.; Eid H.H.; Hassan H.A.; Sleem A.A.; Pharmacognosy Department; Cairo University; Cairo; Egypt; Pharmacognosy Department; October University for Modern Sciences and Arts (MSA); Giza; Egypt; Pharmacology Department; National Research Center; Giza; Egypt
    Hydrodistilled essential oil of fresh leaves of Oroxylum indicum L. family Bignoniaceae cultivated in Egypt was analyzed by gas chromatography?mass spectrometry (GC/MS) .The yield of essential oil was (0.2 %) . Thirty nine components were identified representing (89.85%). Ar-tumerone (19.37%), a sesquiterpene ketone, was the major constituent in the oil followed by methyl hexadecanoate (6.2%), laurenan-2-one (5.59%) and isopropyl butanoate (5.57%). The oxygenated constituents represents (63.81 %) while non- oxygenated constituents represents (26.04 %) .The oil showed significant cytotoxic activity on MCF7 (breast carcinoma cell line), HEPG2 (liver carcinoma cell line) and HELA (cervix carcinoma cell line) ,in addition to good in vivo and in vitro antioxidant activity. The oil also exhibited both hepatoprotective and heptocurative action, but showed weak antimicrobial activity against tested bacteria with no effect against fungi. � 2015, International Journal of Pharmacognosy and Phytochemical Research. All rights reserved.
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    A wideband compact filtering array antenna using two sections L-CRLH impedance transformer
    (Institute of Electrical and Electronics Engineers Inc., 2019) Abdalla M.A.; Hassan H.A.; Hammad Y.; Ameen M.; Chaudhary R.K.; MTC College; Electronic Engineering Department; Cairo; Egypt; MSA; Electrical System Engg. Dept.; Giza; Egypt; Electronics Eng; Indian Institute of Technology (ISM); Dhanbad; India
    In this paper, a new two-elements wideband circular monopole array antenna is presented. The array is fed by a new compact two-sections wideband impedance transformer. The transformer is comprised of two unit cells of inductor loaded composite right/left handed (L-CRLH) transmission line. The L-CRLH transformer has a size of 9.3�15.3 mm2 ?0.54� 1.07 ?g2, at mid frequency; 80% miniaturized compared to conventional design. The simulation results confirm that the transformer has a return loss less than 10 dB and insertion loss less than 0.02 dB within the passband. Consequently, the array antenna has wideband 10 dB return loss bandwidth from 1.6 GHz-3.3 GHz (70%) with 3 dB out of band at 0.95 GHz and 3.95 GHz. � 2019 IEEE.