http://repo.lib.sab.ac.lk:8080/xmlui/handle/123456789/573 2026-04-20T03:57:44Z 2026-04-20T03:57:44Z Jayasinghe, M.T.R. http://repo.lib.sab.ac.lk:8080/xmlui/handle/susl/2573 2022-10-07T05:37:52Z 1999-12-01T00:00:00Z

Cpst Effective Buildings with Local Bricks Jayasinghe, M.T.R. Load bearing brickwork can be used in two to three storey buildings eliminating the reinforced concrete framework thus leading to a considerable economy. However, this method of construction is not often used since the locally available bricks are of low quality and hence structural engineers are rather reluctant to promote it. It is shown here that it is possible to achieve a characteristic strength of 1.5 N/mm2 when bricks satisfy certain physical testing criteria. The quality control measures required for such construction are also highlighted. It is also shown that although the use of 1.5 N/mm2 design compressive strength offers satisfactory behaviour with respect to primary effects, further precautions will be required in load bearing brickwork structures to prevent cracking due to stresses of secondary nature.

1999-12-01T00:00:00Z Dharmaratne, P.G.R. http://repo.lib.sab.ac.lk:8080/xmlui/handle/susl/2572 2022-10-07T05:31:27Z 1999-12-01T00:00:00Z

Crjtical Evaluation of Fashioning of Gemstones in Sri Lanka Dharmaratne, P.G.R. Sri Lanka exports about six million carats of gemstones worth rs 4000 miilion per year, of which, over four million carats are calibrated stones and the balance is free sized stones. The value of the free sized stones is about Rs 3600 million per year. The calibrated stones require accurate dimensions and proportions, whereas free sized stones are cut without paying much attention to the lustre and brilliance, which are essential properties of gemstones. Sri Lankan lapidarists always optimize the weight of the stone than the quality. Foreign gem traders almost always re-cut Sri Lankan cut and polished stones. Advertisements still appear in international magazines making available " Sri Lankan cut and polished stones suitable for re-cutting" This paper discusses the importance of the quality of cutting, in order to enhance the value of gemstones and also the possibility of expanding the gem industry by introducing the use of ornamental stones.

1999-12-01T00:00:00Z Priyanath, H M S http://repo.lib.sab.ac.lk:8080/xmlui/handle/susl/2571 2022-10-07T05:25:06Z 1999-12-01T00:00:00Z

Socio-Economic and Environmental Impact of Gem Mining Industry In Sri Lanka: A Case Study of Hunuwala Village In Ratnapura District Priyanath, H M S The gem mining industry (GMI) is one of Sri Lanka's major sources of income and employment. However, it also has considerable socio-economic and environmental (SEE)consequences affecting gem miners and the general public as well. This paper discusses the present SEE impact of the GMI, based on primary data gathered from a field survey undertaken at a gem mining village - Hunuwala in the Ratnapura district. The decline of agricultural production, rising income inequality, seasonal unemployment of gem mining laborers as well as a decline of education, health and living standards were identified. In addition, water pollution, soil erosion and the destruction of areconut trees are the major environmental problems. In order to develop the GMI, it is recommended that both labourers and mine owners are made aware of the adverse consequences of these activities and that the applicable rules and regulations are observed strictly.

1999-12-01T00:00:00Z de Silva, R. P. http://repo.lib.sab.ac.lk:8080/xmlui/handle/susl/2570 2022-10-07T04:43:25Z 1999-12-01T00:00:00Z

A Comparison of Different Models of Estimating Actual Evapotranspiration from Potential Evapotranspirattón in the Dry Zone of Sri Lanka de Silva, R. P. This paper compares widely used methods of estimating actual evapotranspiration from potential evapotranspiration and shows that actual evapotranspiration is approximately the same irrespective of the method used to estimate it in the dry zone of Sri Lanka. This finding is in line with the findings of a similar study in UK.

1999-12-01T00:00:00Z