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| 1 | Effect of Stearic Acid on Ettringite Formation显示文摘The hydration reaction of a mixture of tricalcium aluminate (C3A) and gypsum with the molar ratio of 1:3 was carried out at room temperature and a water/solid ratio of 4.0. The hydration was carried out in presence of 0, 1 and 3% stearic acid and the mixes were designated as A, B and C, respectively. Ettringite was the only hydration product formed in the presence and absence of stearic acid. Phase composition, microstructure, infra-red analysis as well as degree of hydration were carried out for the different hydration mixtures. The rate of ettringite formation in the presence of 3% stearic acid was accelerated during the first half hour of hydration, and then retardation was occurred. In the presence of 1% stearic acid the ettringite formation was accelerated first till 3 days, then retardation was observed at later hydration ages. | Essam A.KisharDepartment of Chemistry, Faculty of Girls, Ain Shams University, Cairo, Egypt | 2002 | Journal of Materials Science & Technology2002，18，3： | 1 |
| 2 | Relationships between the T- peak to T-end interval, ventricular tachyarrhythmia, and death in left ventricular systolic dysfunction 显示文摘 | Morin DP Saad MN Shams OF | 2012 | Europace2012，14，8： | 1 |
| 3 | Some reactions of 4-aryl-1 (2H)-phthalazinones显示文摘The behayiors of 4-aryl-1 (2H)-phthalazinones (1a-c)toward carbon nucleophiles (Grignardreagents) and secondary amine under Mannich conditions as well as the nucleophilic substitution reactionon chlorophthalazine derivatives have been studied. | SOLIMAN, A.Y.* BAKEER, H.M., Department of Chemistry, Faculty of Education, Fayoum, EgyptSAYED, M.A., Faculty of Science, Ain Shams University, Cairo, EgyptISLAM, I. MOHAMED, A.A., Faculty of Science, El-Azher University, Cairo, Egypt | 1990 | Chinese Journal of Chemistry1990，8，6： | 0 |
| 4 | STUDY ON THE SYNTHESIS OF BRASSINOLIDE AND RELATED COMPOUNDS 15.FORMAL SYNTHESIS OF BRASSINOLIDE VIA STEREOSELECTIVE SULFENATE-SULFOXIDE TRANSFORMATION显示文摘A formal synthesis of the natural growth promoting steroidbrassinolide is described,which involves construction of side chainby 1,3-sulfoxide-hydroxyl transposition with methylation from(24S)-22-E-24-sulfoxide 6 and(24R)-22-E-24-sulfoxide 9,respectively to(22S)-23-E-24-methyl compound 4. | Wei Sham ZHOU Zheng Wu SHEN Shanghai Institute of Organic Chemistry,Chinese Academy of Science,345 Lingling Lu,Shanghai 200032 | 1991 | Chinese Chemical Letters1991，2，2： | 0 |
| 5 | Impact of industrial wastewater disposal on surface water bodies in Mostord area, North Greater Cairo显示文摘The studied area (Shoubra El Khima, Bahteem and Mostorod) lies in the industrial area north of Greater Cairo. The area suffers from several environmental problems such as sewage and disposal of pollutants from the surrounding factories into the surface water pathways in the area. Water samples were collected seasonally from different waterways found in the area, domestic and or industrial liquid wastes from 12 discharge tubes of different factories (as a point source of pollution). Chemical characteristics of different water samples and its heavy metals content were determined using ion coupled plasma technique (ICP). Results indicate that industrial and domestic wastewater samples contain several toxic levels of tested heavy metals (Cd, Co, Pb and Ni) which have a serious impact on surface waterways in the area. Shebin El Qanater collector drain samples exhibited the highest levels of Cd, Co, Pb and Ni compared to other tested water bodies. Mostorod collector drain samples showed the highest levels of Zn and Cu. Industrial effluent samples collected from Cairo Company for Fabric industry had the highest amounts of total Zn Cu, Cd, Co and Pb, while Delta steel company discharges the highest amounts of total Fe and Mn. Al Ahleya Plastic Company discharges the highest amounts of total Ni. Generally, it is necessary to impose the environmental laws and its regulation regarding the industrial wastewater treatments and disposals to minimize the risk of the adverse effects of these pollutants. | M.F.Abdel Sabour 1, F.H.Rabie 2, T.Mostafa 3, S.A.Hassan 4 (1 Soil and Water Pollution Unit, Nuclear Research Center, Egypt. 2 Soil Department, Faculty of Agricultural, Ain Shams University, Egypt 3 Soils, Water and Environment Research Instit | 2001 | Journal of Environmental Sciences2001，13，4： | 0 |
| 6 | A novel 2-C reactivity studies of 1-aroyl-l,2dihydro-3H-naphtho[2,1-b]pyran-3-ones显示文摘The 2-C,methylene group of 1-aroyl-1,2-dihydro-3H-naphtho[2,1-b]pyran-3-ones(2)have been showed to possess a superior reactivity towards many of organic reagents.The na-phthopyrones(2)condensed with aromatic aldehydes to give the 2-arylidine derivatives(3).Bromin-ation of 2 gave 1,2-dibromo(4)or 5-bromo(5)derivatives depending on the reaction conditions.The base catalyzed addition or cycloaddition of naphthopyrones(2)to 4-methoxy benzalacetophenonegave the expected Michael adduct(6)or the cyclic adducts(7-9)depending on the type of catalyticbase and reaction conditions.Structures of the products have been established by elemental analyses,IR and ~1H NMR spectroscopic methods. | EL-KASABY,M.A. HASSAN,M.A. SHIBA,S.A. ABOU-EL-REGAL,M.M.Department of Chemistry,Faculty of Science,Ain Shams University,Cairo,Egypt | 1990 | Chinese Journal of Chemistry1990，8，5： | 0 |
| 7 | Synthesis and comparative study of reactivities of δ-lactone,estor group and oxazinone ring in coumarin derivatives towards carbon or nitrogen nucleophiles显示文摘Condensation of methyl 7-methylcoumarin-4-acetate(2)with primary amines and with an-thranilic acid gave 7-methyl-2-oxo-N-aryl-2H-[1]-benzopyran-4--acetamide(4a—d)and(7),respectively.Compound 7 underwent cyclization to give 2-(7-methyl-2-oxo-2H-[1]-benzopyran-4-yl)-methyl-4H-3,1-benzoxazin-4-one(3).The reaction of 3 with aromatic amines gave the corresponding quinazolonederivatives 5 which tautomerises to the thermodynamically more stable isomer 6,whereas its reactionwith Grignard reagents and aromatic aldehydes gave 8a,8b,and 9a,9b,respectively. | EL-KAFRAWY,A.F. SOLIMAN,A.Y. BAKER,H.M. MOHAMED,F.K. EL-KADY,M.Y.Department of Chemistry,Faculty of Science,Ain Shams University and Faculty of Education at El-Fayoum,Cairo.Egypt | 1990 | Chinese Journal of Chemistry1990，8，5： | 0 |
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