Development of a flexible porous pipe using rubber crumb and recycled polyethylene

The main objective of this study is to develop a porous flexible rubber pipe utilizing the rubber crumband recycled polyethylene for micro irrigation system to maintain under ground moisture content.The research work was mainly based on the formula development and the process development.Initially number of formulations based on the plastic binder and vulcanized rubber powder (rubbercrumb) and their blends were used. After selecting some useful formulas, process development wascarried out based on the temperature settings of the extruder barrels and the mixing characteristics ofthe blends.Flexible porous pipe products based on the developed formulas were tested on range of applicationrequirements such as strength properties (tensile & tear strengths), resistance properties (UV, ESCR,chemical resistances), water discharge rate through its wall, pressure existence, durability and densityof the product. Results obtained were evaluated to select the most suitable compound compositionfor porous pipes that yields the best compromise of processability parameters and performancecharacteristics.After careful examination of performance applications and quality aspects of the selected product, aprocess was developed for commercial implementation with a competitive price. As the final productcontains fairly high percentage of recycled rubber (rubber crumb) it is going to be one of the majorsolution for growth of the amount of wasted tire in the environment. The product based on thedeveloped compound composition is fully implemented in commercial scale and expected to introduceto local market and also in foreign market.

Comparison of Delay Distributions of Responses in a Home Area Network using Wi-Fi with and without in-network Data Aggregation

Smart Grid is divided into seven sub domains by NIST. The customer domain refers to the end users of electricity. In addition to the traditional role of consumer, they will also participate in generation as well as storage of energy. They would respond to signals coming from the grid and reduce or increase consumption and/or generation accordingly. For this purpose the customer premise should be equipped with an information network, which is called a Home Area Network. Architecture of a Home Area Network needs to be optimised in terms of time and energy. In this research the behaviour of a HAN in terms of time is studied. Delays of responses from the devices for the requests made by the central controller were measured for two most popular architectures, with and without in-network data aggregation. When the probability mass functions were plotted, it was evident that the delays in the two cases do not differ by much

Overview of different types of fly ash and their use as a building and construction material

Fly ash is produced, in massive amount, as a waste material of burning fossil fuel (coal combustion) for the thermal generation of electricity. Currently about 900 million tonnes of fly ash produced, worldwide, annually and about 30-40% of this residue is being utilized for various purposes including in cement and concrete production. Disposing the remaining percentage is costly as it should be done carefully to avoid any environmental pollution, mainly groundwater contamination. There are different types of fly ash, including Class F and Class C, generated by burning black coal and brown coal respectively. Class F and Class C are being utilized in making building materials such as concrete, lightweight aggregate, bricks etc. Also fly ash is used as a material for road construction and earth filled dam construction. This paper outlines an overview of using fly ash as a raw material in producing various building materials and methods of how fly ash is being incorporated with other materials. The major benefits and limitations of using fly ash as a building and construction materials are discussed

Novel Acumens into Biodegradation: Impact of Nanomaterials and Their Contribution

Biodegradation is the most viable alternative for numerous health and environmental issues associated with non-biodegradable materials. In recent years, there has been considerable interest in biodegradable nanomaterials due to their relative abundance, environmental benignity, low cost, easy use, and tunable properties. This chapter covers an overview of biodegradation, factors and challenges associated with biodegradation processes, involvement of nanotechnology and nanomaterials in biodegradation, and biodegradable nanomaterials. Furthermore, current chapter extensively discusses the most recent applications of biodegradable nanomaterials that have recently been explored in the areas of food packaging, energy, environmental remediation, and nanomedicine. Overall, this chapter provides a synopsis of how the involvement of nanotechnology would benefit the process of biodegradation

Weak charge form factor and radius of 208Pb through parity violation in electron scattering

We use distorted wave electron scattering calculations to extract the weak charge form factor F_W(q), the weak charge radius R_W, and the point neutron radius R_n, of 208Pb from the PREX parity violating asymmetry measurement. The form factor is the Fourier transform of the weak charge density at the average momentum transfer q=0.475 fm$^{-1}$. We find F_W(q) =0.204 \pm 0.028 (exp) \pm 0.001 (model). We use the Helm model to infer the weak radius from F_W(q). We find R_W= 5.826 \pm 0.181 (exp) \pm 0.027 (model) fm. Here the exp error includes PREX statistical and systematic errors, while the model error describes the uncertainty in R_W from uncertainties in the surface thickness \sigma of the weak charge density. The weak radius is larger than the charge radius, implying a "weak charge skin" where the surface region is relatively enriched in weak charges compared to (electromagnetic) charges. We extract the point neutron radius R_n=5.751 \pm 0.175 (exp) \pm 0.026 (model) \pm 0.005 (strange) fm$, from R_W. Here there is only a very small error (strange) from possible strange quark contributions. We find R_n to be slightly smaller than R_W because of the nucleon's size. Finally, we find a neutron skin thickness of R_n-R_p=0.302\pm 0.175 (exp) \pm 0.026 (model) \pm 0.005 (strange) fm, where R_p is the point proton radius.Comment: 5 pages, 1 figure, published in Phys Rev. C. Only one change in this version: we have added one author, also to metadat

Immunohistochemical detection of Claudin low breast cancer; which subcellular level to be assessed?

Objectives: Claudin low breast cancers are often high grade, triple negative tumours with poor prognosis.  They are identified at genetic level and are not diagnosed routinely by immunohistochemistry. The objective was to determine the best subcellular level to detect Claudin low breast cancer by immunohistochemistry, in terms of their histopathological prognostic features.Methods: This cross sectional study included all archival breast cancer tissue collected up to December 2015 in our unit. Tissue microarrays (TMA) were constructed using 23 breast cancer cores with a diameter of 2mm, in each TMA. TMAs were immunohistochemically stained for Claudin 3 expression and was scored as; no staining=0, weak staining=1, moderate staining=2 and strong staining=3, separately for membrane, cytoplasmic and nuclear staining. A score <2 was considered Claudin low and analysed against the histopathological prognostic features of the breast cancer.Results: A total of 546 breast cancers were assessed. Claudin low expression was identified at cytoplasmic, membrane and nuclear level in 74.9%, 74.5% and 42% of breast cancers respectively. Low nuclear expression of Claudin 3 was associated with high grade (p=0.028), Nottingham Prognostic Index of >3.4 (p=0.028), ER and PR negative (p<0.001) and HER 2 negative (p=0.013) tumours while low membrane staining was associated with low grade (p=0.038), HER 2 negative (p<0.001) breast cancers. Low cytoplasmic staining was associated with HER 2 negative breast cancer only (p=0.002).Conclusions: Nuclear staining for Claudin should be assessed to identify Claudin low breast cancer by immunohistochemistry as it significantly associates with most of the Claudin low breast cancer characteristics

Comparison of psychological wellbeing among undergraduates of University of Sri Jayewardenepura

Objectives: Psychological distress is an increasingly important public health problem and 12.3% of the population suffers from some form of mental illness. It is experienced as sadness, anxiety, fear and in extreme cases as psychotic symptoms. Psychological distress among university students is more compared to general population. This study was conducted to determine psychological distress and predictive factors in medical undergraduates and to compare them with two other main streams of undergraduate education, in University of Sri Jayewardenepura.Methods: A surveying method was adapted to select 408 final year students from all three faculties using the General Health Questionnaire 30 (GHQ - 30), an internationally accepted, nationally validated to determine psychological distress. Frequency tabulation and Chi-squared tests were used for analysis by SPSS (15). GHQ score of six (6) or more indicated distress.Results: Among the undergraduates, 240 (58.8%) had a score more than 6. The prevalence of stress was higher among medical students 95(62.5%), than Applied Sciences 69(60%) and Management students 76(53.5%). Age of students (p=0.015), effect of studies on personal life (p=0.025), responsibilities as a group leader (p=0.05) and transport and meals (p=0.006) were found as independent significant risk factors for distress. Student’s gender (p=0.10), oral presentations (p=0.36) and continuous assessments (p=0.35) were not significantly associated with psychological distress.  Specific tasks during clinical appointments were identified as stressful by majority of medical students. Conclusions: High prevalence of psychological distress in undergraduates, especially among medical students is identified. The need for detailed assessment of stressors and coping strategies is highlighted and emphasizes the necessity of early interventions to prevent, long term psychological sequelae