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Classical Heisenberg Hamiltonian Solution of Oriented Spinel Ferrimagnetic Thin Films
P. Samarasekara
Physics , 2007,
Abstract: The classical Heisenberg Hamiltonian was solved for oriented spinel thin and thick cubic ferrites. The dipole matrix of complicated cubic cell could be simplified into the form of dipole Matrix of simple cubic cells. This study was confined only to the highly oriented thin films of ferrite. The variation of total energy of Nickel ferrite thin films with angle and number of layers was investigated. Also the change of energy with stress induced anisotropy for Nickel ferrite films with N=5 and 1000 has been studied. Films with the magnetic moments ratio 1.86 can be easily oriented in 90 direction when N is greater than 400.
A survey of odonate assemblages associated with selected wetland localities in southern Sri Lanka
Chandana, E.P.S.,Rajapaksha, A.C.D.,Samarasekara, W.G.K.H.
Asian Journal of Conservation Biology , 2012,
Abstract: The dragonflies and damselflies are a major insect group (Class Insecta; Order Odonata) associated with water courses. Odonate assemblages with reference to their habitat characters have not been widely studied in Sri Lanka. We have investigated odonate assemblages for a period of three months in selected localities in southern Sri Lanka with reference to the habitat characters. Bundala and Embillakala lagoons in Bundala National Park (A Ramsar wetland in Sri Lanka), “Kirala Kele” Eco-tourism Zone-Matara, Bandaththara marshland system-Matara, “Kirala Kele” Biological Garden-Ambalanthota and Kosgahadola stream which belongs to Mulatiyana Rain forest reserve were selected as study sites since these sites are important in conservation of biodiversity. A total of 28 species were identified during the study period. Our data reveals odonate assemblages specific to the studied habitats such as bushlands, marshlands, lagoons, flowing water bodies, stagnant water bodies and vegetation type (wet zone and dry zone). These data will be useful in future studies and conservation of biodiversity in the studied habitats.
Prevalence of inflammatory bowel disease in two districts of Sri Lanka: a hospital based survey
Madunil A Niriella, Arjuna P De Silva, Asangi HGK Dayaratne, Madurangi HADP Ariyasinghe, Metthanandha MN Navarathne, Ranjith SK Peiris, D Samarasekara, Raveendra L Satharasinghe, Sharman Rajindrajith, Anuradha S Dassanayake, A Wickramasinghe, H de Silva
BMC Gastroenterology , 2010, DOI: 10.1186/1471-230x-10-32
Abstract: To determine prevalence and clinical characteristics of IBD, a hospital-based survey was performed in the Colombo and Gampaha districts (combined population 4.5 million) in Sri Lanka. Patients with established ulcerative colitis (UC) and Crohn's disease (CD), who were permanent residents of these adjoining districts, were recruited from hospital registries and out-patient clinics. Clinical information was obtained from medical records and patient interviews.There were 295 cases of IBD (UC = 240, CD = 55), of which 34 (UC = 30, CD = 4) were newly diagnosed during the study year. The prevalence rate for UC was 5.3/100,000 (95% CI 5.0-5.6/100,000), and CD was 1.2/100,000 (95% CI 1.0-1.4/100,000). The incidence rates were 0.69/100,000 (95% CI 0.44-0.94/100,000) for UC and 0.09/100,000 (95% CI 0.002-0.18/100,000) for CD. Female:male ratios were 1.5 for UC and 1.0 for CD. Mean age at diagnosis was (males and females) 36.6 and 38.1y for UC and 33.4 and 36.2y for CD. Among UC patients, 51.1% had proctitis and at presentation 58.4% had mild disease. 80% of CD patients had only large bowel involvement. Few patients had undergone surgery.The prevalence of IBD in this population was low compared to Western populations, but similar to some in Asia. There was a female preponderance for UC. UC was mainly mild, distal or left-sided, while CD mainly involved the large bowel.Inflammatory bowel disease (IBD) includes ulcerative colitis (UC) and Crohn's disease (CD), which are chronic inflammatory diseases of the gastrointestinal tract. The underlying aetiology and pathogenesis of IBD remains largely unknown, but are thought to result from an interaction between genetic susceptibility, environmental factors and the host immune response. IBD has been regarded as a disease primarily occurring in Western populations. High prevalence rates have been reported from North America, United Kingdom, and Northern Europe [1-3]. Although it was earlier considered rare in Asia [4-6], a number of rec
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