Ultra Complex MIM Parts in Automotive Application

Peiris Dunstan 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1

NUTRITIVE VALUE OF GUINEA GRASS (Panicum maximum Jacq.) AND UREA SUPPLEMENTED RICE STRAW FOR CATTLE

Peiris, H.,Ibrahim, M.N.M. Asian Australasian Association of Animal Productio 1995 Animal Bioscience Vol.8 No.1

An experiment was conducted to study the comparative performance of cattle fed young or mature guinea grass (Panicum maximum Jacq. ecotype A) and urea supplemented rice straw. Evaluation was based on intake and digestibility parameters. Twelve crossbred bulls calves weighing $90{\pm}15$ kg were offered young (4 weeks regrowth) or mature (9 weeks regrowth) grass in the long or chopped (10-15 cm) form, and rice straw supplemented with urea. The diets were offered 30-60% in excess of voluntary intake, and the experiment consisted of two periods. The crude protein content of the young grass, mature grass and the straw offered were 12.2, 5.4 and 7.7%, respectively, and the refusal was 10.1, 3.9 and 7.0%, respectively. The organic matter digestibility of the young grass (69%) was significantly higher than the mature grass (62.5%) and straw (55.8%) diets. The organic matter intake (kg/100 kg LW/day) of the unchopped and chopped grass diets were 2.6 and 3.3 respectively, and these values were significantly higher (p < 0.01) than the young grass (2.3) and straw (2.1) diets. The digestible organic matter intake (DOMI) of the mature grass diet offered in the chopped form (2.1 kg/100 kg LW/day) was significantly higher (p < 0.01) than the other three diets. The DOMI of the young and mature grass offered in the long form was similar (1.6 kg/100 kg LW/day), but were significantly better (p < 0.01) than the urea supplemented straw diet.

Novel fuzzy based model on analysis of invasiveness due to dispersal related traits of plants

HOW Peiris,S. Chakraverty,SSN Perera,SMW Ranwala 원광대학교 기초자연과학연구소 2017 ANNALS OF FUZZY MATHEMATICS AND INFORMATICS Vol.13 No.3

Invasive Alien Species (IAS) can be considered as a serious threat to the existence of the biodiversity as they alter physical, chemical and biological components of the environment. Invasive potential of species can be recognized by their biological traits. Therefore, it is very important, if a model could be developed to measure the biological risk of plant species before introducing to a new environment. This work aims to incorporate dispersal related biological traits into a mathematical model to evaluate the risk of plant species. To build up the model, four factors of dispersal traits have been considered and grade of important weights of these traits towards invasiveness was assigned as explained in Chang's extent analysis and Buckly's methods (Column geometric mean method). The present model is found to be a better tracking system for identifying potential invaders compared to the conventional manually conducted risk assessment methods when incorporated with important weights as per Chang's extent analysis.

TiO₂ Nanoparticles from Baker’s Yeast: A Potent Antimicrobial

( Mmk Peiris ),( Tdcp Guansekera ),( Pm Jayaweera ),( Ssn Fernando ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.10

Titanium dioxide (TiO₂) has wide applications in food, cosmetics, pharmaceuticals and manufacturing due to its many properties such as photocatalytic activity and stability. In this study, the biosynthesis of TiO₂ nanoparticles (NPs) was achieved by using Baker’s yeast. TiO₂ NPs were characterized by X-ray Diffraction (XRD), UV-Visible spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Energy Dispersive X-ray analysis (EDX) studies. The XRD pattern confirmed the formation of pure anatase TiO₂ NPs. According to EDX data Ti, O, P and N were the key elements present in the sample. SEM and TEM revealed that the nanoparticles produced were spherical in shape with an average size of 6.7 ± 2.2 nm. The photocatalytic activity of TiO₂ NPs was studied by monitoring the degradation of methylene blue dye when treated with TiO₂ NPs. TiO₂ NPs were found to be highly photocatalytic comparable to commercially available 21 nm TiO₂ NPs. This study is the first report on antimicrobial study of yeast-mediated TiO₂ NPs synthesized using TiCl₃. Antimicrobial activity of TiO₂ NPs was greater against selected Gram-positive bacteria and Candida albicans when compared to Gram-negative bacteria both in the presence or absence of sunlight exposure. TiO₂ NPs expressed a significant effect on microbial growth. The results indicate the significant physical properties and the impact of yeast-mediated TiO₂ NPs as a novel antimicrobial.

Fire resistance tests of LSF walls under combined compression and bending actions

Mithum Peiris,Mahen Mahendran 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.4

Cold-formed steel wall panels sheathed with gypsum plasterboard have shown superior thermal and structural performance in fire. Recent damage caused by fire events in Australia has increased the need for accurate fire resistance ratings of wall systems used in low- and mid-rise construction. Past fire research has mostly focused on light gauge steel framed (LSF) walls under uniform axial compression and LSF floors under pure bending. However, in reality, LSF wall studs may be subject to both compression and bending actions due to eccentric loading at the wall to-roof or wall-to-floor connections. In order to investigate the fire resistance of LSF walls under the effects of these loading eccentricities, four full-scale standard fire tests were conducted on 3 m x 3 m LSF wall specimens lined with two 16 mm gypsum plasterboards under different combinations of axial compression and lateral load ratios. The findings show that the loading eccentricity can adversely affect the fire resistance level of the LSF wall depending on the magnitude of the eccentricity, the resultant compressive stresses in the hot and cold flanges of the wall studs caused by combined loading and the temperatures of the hot and cold flanges of the studs. Structural fire designers should consider the effects of loading eccentricity in the design of LSF walls to eliminate their potential failures in fire.

THE BIAS OF LAG WINDOW ESTIMATORS OF THE FRACTIONAL DIFFERENCE PARAMETER

Hunt, Richard,Peiris, Shelton,Weber, Neville 한국전산응용수학회 2003 Journal of applied mathematics & informatics Vol.12 No.1

An approximation for the bias in lag window estimators of the degree of differencing in fractionally integrated time series models is derived. The expression obtained is compared with the observed bias from simulations for various windows.

The bias of lag window estimators of the fractional difference paramete

R. L. Hunt,M. S. Peiris 한국전산응용수학회 2003 Journal of applied mathematics & informatics Vol.12 No.1-2

Tuber quality of Ashwagandha (Withania somnifera Duanal) affected by different growth conditions

Kaliyadasa Ewon,Lalith Jayasinghe,Sriyani Peiris 충남대학교 농업과학연구소 2019 Korean Journal of Agricultural Science Vol.46 No.1

Ashwagandha (Withania sominifera Duanal) is an important medicinal herb with increased demand after discovering its anti-stress and sex stimulating properties that are attributed to the presence of biologically active alkaloid compounds. The aim of this study was to elucidate a proper agro technological package that ensures the optimum growth of Ashwagandha to obtain the finest quality without degrading the pharmacologically active constituents. Mixtures of organic and inorganic fertilizers were combined with direct seeding and transplanted as four different treatments in this study. The fresh and dry weights of the tubers were recorded up to 12 months starting from two months after sowing (MAS) while the shoot height, root length, number of leaves, fresh and dry weights of the shoot and the root with a shoot ratio of up to 6 MAS were determined. The results revealed that the growth of Ashwagandha was not affected significantly by the method of planting, type of fertilizer or their combinations during most of the harvests. However, tubers harvested at 6 MAS had the highest recorded dry tuber weight per plant in all four treatments compared to the early harvests where two direct seeded treatments had the best results. Comparison of the phytochemical compounds showed that direct seeding with organic fertilizer had the highest recorded values for alkaloid and withaferine A contents with a lower percentage of fiber compared to the treatments with inorganic fertilizer. In conclusion, direct seeding with organic fertilizer and tubers harvested at 6 MAS are recommended as the best cultivation conditions and harvesting stage to obtain high quality tubers of Ashwagandha, respectively.

Supraorbital nerve exits: positional variations and localization relative to surgical landmarks

Deepthi Nanayakkara,Ruwanthi Manawaratne,Harshana Sampath,Amal Vadysinghe,Roshan Peiris 대한해부학회 2018 Anatomy & Cell Biology Vol.51 No.1

Significant variations exist in the occurrence, form, and position of supraorbital nerve exits through the frontal bone. Detailed knowledge of the positional variations of supraorbital exits is important to ensure safe and successful regional anesthesia, and to avoid iatrogenic nerve injuries during surgery of the orbitofacial region. Supraorbital nerve exits from 116 sides of 58 dry intact adult skulls (37 male and 21 female) in a Sri Lankan population were examined to determine the morphological features and the precise position in relation to the facial midline, temporal crest of frontal bone, and frontozygomatic suture. A majority of supraorbital nerve exits existed as notches (73.8%) and the rest as foramina (26.2%). Accessory exits were seen in 18.9% skulls. Of the skulls examined, 55.1% displayed bilateral supraorbital notches, 8.6% had bilateral supraorbital foramina, and 36.3% had a notch on one side and a foramen on the contralateral side. In males, the supraorbital nerve exit was located 23.64±3.49 mm laterally from the facial midline, 27.86±2.76 mm medially from the temporal crest of the frontal bone, 28.66±2.56 mm from the frontozygomatic suture, and 2.12±1.07 mm above the supraorbital margin in the case of a foramen, and in females 22.69±3.28 mm laterally from the facial midline, 26.32±3.02 medially from temporal crest of frontal bone, 27.29±3.05 from the frontozygomatic suture, and 2.99±1.49 mm above the supraorbital margin when it existed as a foramen. The observations made in this study will be useful when planning a supraorbital nerve block and surgery in the supraorbital region.

Endoscopic Retrograde Cholangiopancreatography in Children: Feasibility, Success, and Safety with Standard Adult Endoscopes and Accessories

Kasadoruge Dinesh Rangika Perera,Nawarathne Mudiyanselage Metthananda Nawarathne,Vajira Tharanga Samarawickrama,Malinda Peiris Deraniyagala,Wickramadurayala Gedara Eranda Luxman,Anthony Nilesh Ranjeev 대한소아소화기영양학회 2022 Pediatric gastroenterology, hepatology & nutrition Vol.25 No.5

Purpose: The role of endoscopic retrograde cholangiopancreatography (ERCP) in the management of hepatobiliary and pancreatic diseases in the pediatric population was not well defined until recently. Our aim was to determine the feasibility, outcomes, and safety of ERCP in a local pediatric population, particularly using standard adult endoscopes and accessories. Methods: This retrospective study was conducted at the National Hospital of Sri Lanka. Pediatric patients (aged <16 years) who underwent ERCP from January 2015 to December 2020 were included in the study. Data, including patient demographics, indications for the procedure, technical details, and associated complications, were collected from the internal database and patient records maintained at the hospital. Results: The study included 62 patients who underwent a total of 98 ERCP procedures. All the procedures were performed by adult gastroenterologists using standard adult endoscopes and accessories. The mean age was 11.01±3.47 years. Pancreatic diseases were the major indications for most of the procedures (n=81, 82.7%), with chronic pancreatitis being the most common. Seventeen procedures (17.3%) were carried out for biliary diseases. Overall cannulation and technical success rates were 87.8% and 85.7%, respectively. Stent placement was the most common therapeutic intervention (n=66; 67.4%). Post-ERCP pancreatitis was the most common complication, occurring in eight patients (8.2%). Conclusion: ERCP can be successfully and safely performed in pediatric populations using standard adult endoscopes and accessories with complications similar to those of adults. Adult ERCP services can be offered to most pediatric patients without additional costs of pediatric endoscopes and accessories.