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Abstract: The addition of fillers in composite of epoxies, improves the dielectric response of the epoxies. The dielectric properties of unfilled and filled composites of epoxy resins have been studied as a function of thickness in the frequency range 10-1 Hz to 105 Hz at room temperature. The response of the unfilled samples shows that the composites behave as an insulator for all thickness. In filled composites at small thickness (0.32 mm) the response shows a loss peak in low frequency regime. The peak is broader than the Debye loss peak which is obscured by the dc conductance. At frequencies greater than ωp the response shows a well defined power law behaviour after the subtraction of C∞. Similar behaviour has been observed at different thickness. Keywords: Dielectric Properties, fillers, loss peak, Debye loss Peak, Power law, localization.Download Full Article |
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Abstract: The main objective of this study was to survey and collect some halophyte species capable of growing in highly salt affected soils and their distribution in relation to some soil properties of district Thatta. Sueda fruticosa, Tamarix aphylla, Ceriops candoleana, Cynodon dactylon, and Chenopodum album species were collected form Thatta. Soil samples were collected from the vicinity of each halophyte and were analyzed for pH, organic matter (OM), electrical conductivity (EC), soluble Na+, Ca2+, Mg2+, HCO3-, Cl-, sodium absorption ratio (SAR), and exchangeable sodium percentage (ESP). Halophytes species collected were analyzed for ion (Na+, K+, Ca2+, Mg2+ and Cl-) contents. Data regarding plant ionic composition showed that contents of Na+ ranged between 3.7-6.9 %, K+ 0.7-1.9 ,Ca+2 0.4--1.2 %, Mg2+ 0.6-2.2 and Cl- contents between 0.1-0.8 in species collected from Thatta, respectively. Data further revealed that maximum Na+ (6.9 and %) was recorded in Sueda fruticosa and Salsola indica, highest K+ (1.9 %) was noted in Chenopodium album species, greatest Ca+2 (1.2 %) was documented in Sueda fruticosa species, highest Mg2+ (2.2 %) was observed in Sueda fruticosa whereas, maximum Cl- (0.8 %) was noted in Sueda fruticosa collected from district Thatta, respectively. Data pertaining to soil properties indicated that EC of studied soils ranged between 7.0-18.4dS m-1, pH 7.5-8.0. O.M 0.82-0.94 % , soluble Ca2+ 17.3-33.3 meq L-1, Mg2+ 15.5-24.6 meq L-1, Na+ 43.6-83.4 meq L-1 , Ka+ 3.20-4.50 meq L-1, HCO3− 2.4-5.3 meq L-1, Cl- 55.6-145.4 meq L-1, SAR 10.2-17.1 whereas, ESP ranged between 12.2-19.6 % in soil samples collected from Thatta, respectively. It was concluded that halophyte species Sueda fruticosa, Tamarix aphylla, gallica, Salsola indica, Cyperus irria accumulate significant amounts of salt (Na+ and Cl-)from salt-affected soil and, therefore, may remediate land to the point where native plants could invade and become established, or the site could be returned to agricultural productivity. These halophytes species have an excellent potential for rehabilitation of degraded salt affected soils. Keywords: Halophytes, Salinity, EC, PH, SAR Organic Matter. |
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Abstract: This paper describes common Sufi beliefs regarding dreams and shrines in Palestine during the 20th century. These beliefs developed during joint and private seasonal visits (ziara). Gaining insight into the sociology of the Sufi cult of saints can enrich our understanding of similar cults in other places and shed light on the reasons for their absence in other societies. The research examines the phenomenon of true dreams at saints' shrines, and explores the historical and contemporary scope of dream pilgrimages to these shrines. Ceremonies that involve visiting saints' shrines have encouraged socio-cultural and psychological-therapeutic dependence of the pilgrims with regard to these shrines. This dependence relationship is deeply rooted in their collective psyche and reinforced and legitimized through Palestinian folklore. This paper is based on primary and secondary sources, interviews with Sufi and people who have been active in participating in these rituals, as well as archival and documentary material, a review of published and unpublished materials, books, and scientific journals. Keywords: Dreams, Shrines, Mystic, Sufis, Islam and Palestine.Download Full Article |
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Editorial |