scholarly journals Synthesis of low-cost magnetite nano-architectures from Sri Lankan laterites

2020 ◽  
Vol 21 (2) ◽  
pp. 91
Author(s):  
D. M. S. N. Dissanayake ◽  
M. M. M. G. P. G. Mantilaka ◽  
H. M. T. G. A. Pitawala
Keyword(s):  
Low Cost ◽  
Sri Lankan

scholarly journals Use of Natural Graphite for an Energy Storage Device

2018 ◽  
Vol 1 (1) ◽  
pp. 52
Author(s):  
P. D. D Dilhani ◽  
K. S. Perera ◽  
K. P. Vidanapathirana ◽  
K. Vignarooban
Keyword(s):  
Low Cost ◽  
Active Material ◽  
Gel Polymer Electrolyte ◽  
Low Frequency ◽  
Liquid Electrolyte ◽  
Nyquist Plot ◽  
Storage Device ◽  
Sri Lankan ◽  
Natural Graphite ◽  
Electrochemical Double Layer

<p><em>Ever growing high concerns over use of safe and low cost devices have provided a substantial attention on natural materials. As such natural graphite which has been deeply integrated into numerous applications is being received a consideration to be used for electrochemical devices. The main objective of this study is to explore the suitability of Sri Lankan natural graphite to serve in electrochemical double layer capacitors (EDLCs). In order to uplift the safety of the device, a gel polymer electrolyte was used instead of a liquid electrolyte. Two identical electrodes were consisted with Sri Lankan natural graphite as the active material and polyvinylidenefluoride as the binder. To prepare the electrolyte, polyvinylidenefluoride co hexafluoropropylene and magnesium perchlorate were used as the polymer and the salt respectively. Cyclic voltammetry test results show that single electrode specific capacitance is depending on the potential window. The percentage reduction of capacitance with continuous cycling was about 28%. Nyquist plot of EDLC further confirm the capacitive nature at low frequency.</em><em></em></p>

The Evaluation of Engineering Properties of Low Cost Concrete Blocks by Partial Doping of Sand with Sawdust

2018 ◽  
Vol 1 (2) ◽  
pp. 26-42
Author(s):  
Pius Rodney Fernando ◽  
T. Hamigah ◽  
S. Disne ◽  
G. G. A. K. Wickramasingha ◽  
A. Sutharshan
Keyword(s):  
Water Retention ◽  
Low Cost ◽  
Testing Machine ◽  
Engineering Properties ◽  
Sri Lankan ◽  
Drying Time ◽  
Minimum Requirement ◽  
Universal Testing ◽  
Manufacturing Procedure ◽  
Concrete Blocks

The main objective of the article is to reduce the quantity of sand with the natural agro waste materials and the performance of sawdust-sand-cement stabilized using sawdust (SD) and cement which investigates the water retention (WR), compressive quality (CQ) and flexural quality (FQ) of the sawdust-sand-cement blocks to find out the conceivable utilization of sawdust as an incomplete substitution of sawdust in blocks creation. For this purpose, various combinations of sawdust, sand, cement, water-content and drying time to create testing blocks. The compressive and flexural qualities of the sawdust-sand-cement blocks were determined using a universal testing machine, as they just cracked due to compression. The greatest compressive and flexural strength of 193 kg.cm-2 and 2.34 kg.cm-2 were recorded at 0% doping at 28th day. However, the most extreme estimation of 106 kg.cm-2 and 1.29 kg.cm-2 for 15% doping is discovered reasonable and prescribed for building development having been achieved at a 28th days compressive and flexural quality which is less than the Sri Lankan Standards (SLS). However, the 15% doping blocks have water retention of 12.4% at 28th days that is the minimum requirement for the block according to the Sri Lankan Standards (SLS). Therefore, these sawdust-sand-cement blocks were found to be weak for medium and heavy building constructions, because of its low density, light weight, low strength. Thus, these sawdust-sand-cement blocks can be used for interior wall partition and decorations. The sawdust-sand-cement block manufacturing procedure being simple can be undertaken as rural entrepreneurship by unskilled labors of developing countries.

scholarly journals Identification of selected genetic polymorphisms in polycystic ovary syndrome in Sri Lankan women using low cost genotyping techniques

PLoS ONE ◽  
2018 ◽  
Vol 13 (12) ◽  
pp. e0209830 ◽  
Author(s):  
Umayal Branavan ◽  
Kajan Muneeswaran ◽  
Sulochana Wijesundera ◽  
Surangi Jayakody ◽  
Vishvanath Chandrasekharan ◽  
...  
Keyword(s):  
Polycystic Ovary Syndrome ◽  
Genetic Polymorphisms ◽  
Polycystic Ovary ◽  
Low Cost ◽  
Sri Lankan ◽  
Ovary Syndrome

scholarly journals Evaluating the Agreement between the Twin-Block Appliance and a New Low-Cost Arch Development Appliance in Changing the Mandibular Length

2020 ◽  
pp. 13-24
Author(s):  
A. M. Imanthi C. K. Jayathilake ◽  
Lakshika S. Nawarathna ◽  
S. P. N. P. Nagarathne
Keyword(s):  
Correlation Coefficient ◽  
Low Cost ◽  
Pearson Correlation ◽  
Intraclass Correlation ◽  
Information Criterion ◽  
Correlation Factor ◽  
Concordance Correlation Coefficient ◽  
Sri Lankan ◽  
Concordance Correlation ◽  
Twin Block

Aim: The main objective of this study is to compare the development of mandibular length by comparing the effectiveness of a new low-cost arch development appliance in increasing the length of the mandible with the twin block appliance (Twin-B). Methodology: This analysis was performed on patients who attended the clinic in the Division of Orthodontics, Faculty of Dental Sciences, University of Peradeniya. The sample included 60 subjects treated with Twin-B (n=30) and new low-cost arch development (n=30) appliances and each appliance comprised 15 males and females. Intraclass Correlation Coefficient (ICC) and the Concordance Correlation Coefficient (CCC) were calculated to check the agreement between the two methods. A mixed-effects model was fitted to predict mandibular length, and Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC), and log-likelihood were used for selecting the best model. Results: It was observed that the Concordance Correlation Coefficient (CCC) for after treatment as 0.9172 with a (0.8488, 0.9555) 95% confidence interval. Furthermore, it gives a Pearson correlation of 0.9609 and bias correlation factor of 0.9545. ICC values after treatment for both single measures and average measures are 0.9499 and 0.9743 with the 95% confidence intervals (0.8976, 0.9758) and (0.9460, 0.9878) respectively. Conclusion: Besides, both Twin-B and new low-cost arch development appliances have a better agreement and can be used interchangeably. Therefore, the new low-cost arch development appliance is more suitable as a treatment for malocclusion for Sri Lankan patients as it is less expensive, simpler and, less invasive.

Fashioning a Socially Responsible Garment Supply Chain

2011 ◽  
pp. 327-362
Author(s):  
Patsy Perry ◽  
Neil Towers
Keyword(s):  
Supply Chains ◽  
Low Cost ◽  
Sri Lankan ◽  
Fashion Industry ◽  
Production Networks ◽  
Global Industry ◽  
High Street ◽  
Drivers Of Csr ◽  
Worker Exploitation ◽  
Corporate Social

The high street fashion industry is a dynamic, challenging global industry and one of few sectors under simultaneous pressure for short lead times and low costs. However, the increasing use of complex global supply chains in order to meet the challenges of the new competitive environment has also increased focus on issues of worker exploitation in globally dispersed production networks. Although there is evidence of a rising consumer demand for low cost, fashionable clothing sourced through ethical supply chains, the nature of the high street fashion industry is not conducive to the implementation of corporate social responsibility (CSR). Qualitative research was undertaken to understand the interplay of obstacles and drivers of CSR implementation in Sri Lankan export garment manufacturers.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

Chromic Acid Etching of Polyethylene

1973 ◽  
Vol 31 ◽  
pp. 72-73
Author(s):  
J. D. Muzzy ◽  
R. D. Hester ◽  
J. L. Hubbard
Keyword(s):  
Chromic Acid ◽  
Low Cost ◽  
Acid Etching ◽  
Crystalline Morphology ◽  
Bulk Specimen ◽  
Morphological Studies ◽  
Perfect Form ◽  
Molecular Length ◽  
Lamellar Texture ◽  
Cost Studies

Polyethylene is one of the most important plastics produced today because of its good physical properties, ease of fabrication and low cost. Studies to improve the properties of polyethylene are leading to an understanding of its crystalline morphology. Polyethylene crystallized by evaporation from dilute solutions consists of thin crystals called lamellae. The polyethylene molecules are parallel to the thickness of the lamellae and are folded since the thickness of the lamellae is much less than the molecular length. This lamellar texture persists in less perfect form in polyethylene crystallized from the melt.Morphological studies of melt crystallized polyethylene have been limited due to the difficulty of isolating the microstructure from the bulk specimen without destroying or deforming it.

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