Volume 01 Issue 02 - 2014
http://dr.lib.sjp.ac.lk/handle/123456789/3297
2024-03-29T11:32:42ZSeasonal Occurrence of Microcystin-LR with Respect to Physico-Chemical Aspects of Beira Lake Water
http://dr.lib.sjp.ac.lk/handle/123456789/4946
Seasonal Occurrence of Microcystin-LR with Respect to Physico-Chemical Aspects of Beira Lake Water
Idroos, S.F.; Manage, P.M.
Cyanobacteria are well known for their ability to produce a group of cyanotoxins referred as microcystins
(MCs). MCs show both acute and chronic hepatotoxic effects on animals and humans. Microcystin-LR
(MCLR) is the dominant type of MCs prevailing in Sri Lankan water bodies. The present study records the
seasonal variation of MCLR, in the Beira lake waters from January 2013 to January 2014 with respect to
some physico-chemical parameters of the lake. Quantification of MCLR was done using photodiode array -
High Pressure Liquid Chromatography method (PDA-HPLC). The physico-chemical parameters of the water
body were measured using standard methods. Microcystis aeruginosa, Microcystis wesenbergii and
Microcystis incerta, were the toxic cyanobacterial species present in the Beiralake while Microcystis
aeruginosa (49.63%) was the dominant species. MCLR concentration of the lake varied between 11.45±0.73
to 17.57±0.13 µg/ml throughout the dry season of the sampling period while varied between 13.21 ±0.73 to
25.23±0.42 µg/ml during the rainy season. The Pearsons correlation coefficient analysis done for total toxin
concentration and the water quality parameters suggested that the water temperature (r=0.914, pvalue=0.000),
and the total phosphate concentration (r=0.988, p-value=0.000) have a strong positive
correlation with the total MCLR concentration, while pH (r=0.766, p-value=0.002) has a moderate
correlation for the production of total MCLR.
2014-01-01T00:00:00ZPropensity of Knowledge Sharing in Software Development Case in Sri Lanka
http://dr.lib.sjp.ac.lk/handle/123456789/3310
Propensity of Knowledge Sharing in Software Development Case in Sri Lanka
Weerakoon, Sudheera; Wijayanayake, Janaka
Knowledge management can be defined as the process by which an organization creates captures, acquires,
and uses knowledge to support and improve the performance of an organization. Organizations need to
manage knowledge within the organization to successfully face challenges and to achieve organizational
goals. However, for better implementation of knowledge management practices, organizations need to have
suitable organizational culture, process and technology. Software development is a process where knowledge
sharing is vital for successful completion of projects and hence need proper knowledge sharing. Therefore,
the objective of this study is to find the motivational factors that affect propensity of knowledge sharing in
software development. To find the motivational factors, based on the findings of research in the literature, a
conceptual model was developed with four independent variables, namely “Perception on knowledge”,
“Time availability for knowledge sharing”, “Gained value from knowledge” and “Distance with
employees”. The conceptual model was validated with data collected from software developers using a
questionnaire and interviews. Data Analysis showed that perceptions on knowledge and time availability for
knowledge sharing have positive moderate correlation with propensity of knowledge sharing. However, it
was found that distance with employees has negative weak correlation with propensity of knowledge sharing
in software development organizations. Further, it was found that gained value from knowledge has negative
weak correlation with propensity of knowledge sharing indicating that if employees get more and more
benefits from the knowledge they have, then they are reluctant to share the knowledge with others.
2016-10-25T07:06:35ZA Study to Recruit and Train the Product Oriented Sensory Panel
http://dr.lib.sjp.ac.lk/handle/123456789/3309
A Study to Recruit and Train the Product Oriented Sensory Panel
Silva, A.Y.S.L.; Binduhewa, A.M.C.U.; Subodinee, A.A.M.
Food industry greatly depends on product quality and price. Sensory evaluation is a scientific method that
humans evaluate the eating quality parameters of food. The study was conducted to evaluate the
performances of the existing sensory panel, to recruit and train new members to sensory panel and to
evaluate the performance of the product oriented sensory panel in the Industrial Technology Institute.
Recruitment and training of product-oriented sensory panel was done according to the International
Standards 8586-1:1993. Initially 29 interested staff members, who were in good health, were selected
through a questionnaire from the same institute. Then they were subjected to several screening tests, namely
basic taste identification test, odour descriptive test, ranking test for the taste intensity, ranking test for the
colour intensity, matching test and texture descriptive test. Seventeen people who were selected from all
screening tests were trained in detection and recognition of tastes and odours, followed by discrimination
tests (Paired comparison test, Duo-trio test and Triangle test) and three different scales (Category scale,
Interval scale and Ratio scale). Results of the sensory evaluations and scales were statistically analyzed via
Friedman Two Way ANOVA rank sum test with SAS 9.0 software. The samples tested were significantly
different from each other (p<0.05) in each test and no significant difference occurred between the judgment
of the panelists. It concluded that they performed as a homogenous trained panel. Finally, sensory evaluation
of black tea was conducted which was shelf life evaluation to evaluate the performance of the panelists with
a real test samples. Data were analyzed via Friedman test and results revealed that all the panelists
performed uniquely at 0.05 significance level. Therefore the recruited sensory panel was considered as a
trained sensory panel and the outcome proved that the effectiveness of training and capability of chosen the
product-oriented sensory panel.
2016-10-25T07:05:32ZMorphmetric Analysis of Randenigala Reservoir Catchment using GIS
http://dr.lib.sjp.ac.lk/handle/123456789/3308
Morphmetric Analysis of Randenigala Reservoir Catchment using GIS
Senadeera, Wasantha
Morphometric techniques play a major role in addressing the quantitative description of the geometry of the
drainage basins and its network. This helps in characterizing the drainage network, comparing the
characteristics and examining the effect of lithology, rock structure and rainfall. The study focuses on
analysis of morphometric features of Randenigala reservoir catchment based on available digital data using
GIS.
River Mahaweli was dammed closer to MinepeAnicut to build Randenigala reservoir with the elevation of
160 m to 240 m (7 8 to 7 14N and 80 48 to 80 49 E). The capacity is 861 MCM and catchment
comprise of 448 km2 in the Kandy and Nuwara-Eliya districts. The elevation of the catchment ranges from
240 m to 2500 m. Method of Horton and Strahler (1945) was used to rank the stream segments. The stream
numbers were entered into the table and other analyses based on the mathematical formulas. The results
indicated that the catchment area was 448.9 km2, perimeter 111.24 km, mean slope 36.8, axial length 30.5
km, basin width 14.72 km, form factor 0.48, compactness factor 1.48, circulatory ratio 0.46, elongation ratio
0.78, orders of stream network indicated, 1315 of first orders, 314 of 2nd, 72 of 3rd, 15 of 4th, 3 of 5th, 1 of 6th
and one seventh order stream. The stream frequency and drainage density were 3.83 (no. of streams /km2)
and 2.43 (km/km2). Bifurcation ratio was 3.65 and length of overland flow was 0.21 km. These findings are
useful in determining the effect of catchment characteristics such as size, shape, slope of the catchment and
distribution of stream network.
2016-10-25T07:04:10Z