ERU - 2010

Permanent URI for this collectionhttp://192.248.9.226/handle/123/14687

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item: Conference-Extended-Abstract
Comparison of rational formula alternatives for streamflow generation for small ungauged catchments
(2010) Wijesinghe, WMD; Wijesekera, NTS
The suitability of the Rational Equation for the derivation of steam/lows for small ungauged watersheds is studied. A Unit Hydrograph can be derived using the peak discharge obtained from the Rational Equation and using unit depth of rainfall in calculating the Rainfall Intensity. Possible alternatives for selection of sub catchments. selection of a guideline to determine the Runoff Coefficients and the Time of Concentration were taken into account. A significant variation of the results was observed with the selected alternatives In order to select a better alternative comparison of generated streamflows with the observed values is required.
item: Conference-Extended-Abstract
Development of an antibacterial non woven filter
(2010) Abeyweera, SM
Medical Textiles is a major area of advancement among the wide scope of textiles which utilized best of textile engineering. Nonwoven technology is heavily utilized for medical textiles though the local technology of non woven manufacturing is not matured. Major use of nonwovens in the medical field is bacteria filtering masks. The currently available imported masks are a heavy burden to be used as disposable masks in local context. In this sense, developing a low cost disposable mask using the locally available needle punching non woven technology incorporating thermal bonding, which has a bacteria filtration efficiency almost over 95%. was a significant achievement. With the limited resources in terms of high tech testing the research provided inspiring results, opening the door to discuss on other value adding applications of such a filtering material other than a mask.
item: Conference-Extended-Abstract
Effects of ultra fines in quarry dust on properties of mortar
(2010) Mathanraj, T; Senthil., B; Gogulan, S; Nanayakkara, SMA
The Quarry dust (QD) is being extensively used as fine aggregates for both mortar and concrete applications as an alternative to river sand. Because of the limited availability of river sand it is necessary to search for alternatives and QD has been identified as one of the best preferred options. QD in this article is referred to quarry dust without changing its original composition. The differences in chemical and physical properties of river sand and OD are significant enough to behave differently in their applications. The primary reason which causes the difference is the physical property. One of the noticeable physical difference is that the possession ultra fines (UF) in different quantities. UF in this context is re ferred as particles less than 75pm. Effects of UF on properties of mortar such as workability, compressive strength, tensile strength and sorptivity were evaluated. Mix proportion of 1:3 cement : fine aggregate was selected with fixed w c ratio of 0. 7. QD with different UF contents (i.e. 5%, 10%. 15 <5:25%) and river sand were considered in study. Results showed that complete removal of UF gave high compressive strength, increased workability', increased sorptivity and lower shrinkage than QD.
item: Conference-Extended-Abstract
Investigation of the factors affecting the formation of cold joints in concrete
(2010) Jatheeshan, V; Peiris, TNU; Mendis, LBSK; Nanayakkara, SMA
Performance of concrete structures can be directly affected by the presence of a joint. These joints can be either intentional or unintentional. The intentional joints may be formed to make the construction sequence more convenient. Construction joints and movement joints are very good examples to illustrate the intentional joints in concrete structures. However there can be joints which are formed unintentionally and can affect the performance of the structure. Cold joints are such unintentional joints which occur due to the time lag of pouring consecutive layers of the concrete. This can be happened when the initial setting time o f the first layer has passed when pouring the second concrete layer. However there were hardly any researches carried out under this topic. Therefore, it was decided to carry out this research to find out the factors which affect the formation of cold joints in concrete. The procedure mentioned in ASTM C403-92 was followed to conduct the penetration resistance test to determine the initial setting time of concrete under laboratory conditions. Test methods were developed to check the influence of a cold joint on strength parameters such as tensile strength and shear strength of concrete at the cold joint. Concrete specimens with cold joint were prepared by varying the casting time of the second concrete layer. From results obtained, it was found that there is a significant reduction in tensile strength and shear strength due to the presence of a cold joint. Furthermore, it was found that a cold joint can be formed even within the initial setting time period if the successive layers of concrete are not vibrated together.
item: Conference-Extended-Abstract
Measuring the heart pulse rate of a human body using a smart textile panel
(2010) Athauda, T; Amarasinghe, A; Dissanayake, G; Samaravvickrama, N; Thaasan, S; Fernando, S; Jayavvardena, TSS; Niles, SN
In today's world people have been using a large number of portable electronic devices in medical diagnosis. Of particular note are the portable heart measuring meters, insulin measuring units etc. But today the world is moving towards (he path of integration of portable sophisticated devices with clothing to achieve simultaneous multi tasking approaches. The concept of electronics collaboration with textiles. called Electronic Clothing , has come to play in many areas. This paper explores this phenomenon from a textile point of view. H hat are the possibilities of integrating electronics into wearable clothing? How can the functionalities of clothing be improved with the presence of health related issues? These questions are being addressed here and the ways of integrating electronics into textile structures are also discussed. Necessary steps to textile research and the current trends of clothing will be taken into consideration with possible future trends and challenges
item: Conference-Extended-Abstract
Proceedings of the 16 Annual Symposium 2010 (Pre Text)
(The Engineering Research Unit University of Moratuwa, 2010-11) Rodrigo, R

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Browsing ERU - 2010 by Faculty "Engineering"