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Qatar University Institutional Repository
Institutional Repository
4645 Publications
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  • Metathesis ring opening polymerization of 5,6-dimethylenebicyclo[2.2.1]hept-2-ene

    5,6-Dimethylenebicyclo[2.2.1]hept-2-ene (I) polymerizes in the presence of the two-component ring opening metathesis polymerization (ROMP) initiators WCl6/(CH3)4Sn and MoCl5/(CH3)4Sn. The product polymers were insoluble in all of many solvents investigated and are presumably cross-linked. The product polymers were investigated by IR and solid state 13C NMR spectroscopy, which established that the material consisted predominantly of poly(1,4-(2,3-dimethylene-cyclopentylene)vinylene) (II). A po...

    Agents of Socialization among Gulf Arab Youth

    In the contemporary sense of the term, political socialization in the Arab Gulf is a recent phenomenon. The literature on the area has been essentially of a historical or journalistic nature. Empirical studies of social change, especially in the advent of the oil era, have only begun to appear. This paper will attempt to study some of the causes and consequences of these changes which are unique in many ways. (1) An empirical investigation of the process of socialization will seek to answer s...

    Scanning electron microscopy of the egg-shell of the fly synthesiomyia Nudiseta (wulp)

    The ultrastructure of the egg-shell of the fly Synthesiomyia nudiseta has been studied by scanning electron microscopy. The surface of the outer chorion is highly ridged, grooved and has a reticulate appearance except at the collar surrounding the micropyle. There are few aeropyles at the antimicropylar pole. The structure of the egg-shell outside the hatching lines is composed of three layers. The outer layer consists of vertical columns that arise from the middle layer, these columns bra...

    Exergames to Improve Postural Balance in Older People with Dementia

    The focus of the study concerns the well-documented increased risk of falling in older adults that can lead sometimes to fatal consequences. Improving posture and motor skills is central to preventing falls. Further investigations targeting specific older people such as those suffering from cognitive impairment or dementia are still needed for fall prevention (Shaw, 2003). New technology-based methods, such as digital motion-sensitive games or exergames, appear promising for improving bala...

    Effects Of Overfishing And Abandoning Bottom Trawling On Qatar's Fisheries

    The present study was conducted to overview the effects of abandoning bottom trawling and increasing fishing effort on the structure and dynamics of Qatar's fisheries during 1985-1994, using the fishery statistics data, issued annually by the Department of Fisheries, Ministry of Municipal Affairs and Agriculture, State of Qatar. The study indicated that the annual catch has been gradually increasing to reach a peak of 8160 t in 1991, followed by a sharp reduction afterwards. As a result, arti...
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