13 research outputs found
Indoor Soiling Method and Outdoor Statistical Risk Analysis of Photovoltaic Power Plants
No full textabstract: This is a two-part thesis.
Part 1 presents an approach for working towards the development of a standardized artificial soiling method for laminated photovoltaic (PV) cells or mini-modules. Construction of an artificial chamber to maintain controlled environmental conditions and components/chemicals used in artificial soil formulation is briefly explained. Both poly-Si mini-modules and a single cell mono-Si coupons were soiled and characterization tests such as I-V, reflectance and quantum efficiency (QE) were carried out on both soiled, and cleaned coupons. From the results obtained, poly-Si mini-modules proved to be a good measure of soil uniformity, as any non-uniformity present would not result in a smooth curve during I-V measurements. The challenges faced while executing reflectance and QE characterization tests on poly-Si due to smaller size cells was eliminated on the mono-Si coupons with large cells to obtain highly repeatable measurements. This study indicates that the reflectance measurements between 600-700 nm wavelengths can be used as a direct measure of soil density on the modules.
Part 2 determines the most dominant failure modes of field aged PV modules using experimental data obtained in the field and statistical analysis, FMECA (Failure Mode, Effect, and Criticality Analysis). The failure and degradation modes of about 744 poly-Si glass/polymer frameless modules fielded for 18 years under the cold-dry climate of New York was evaluated. Defect chart, degradation rates (both string and module levels) and safety map were generated using the field measured data. A statistical reliability tool, FMECA that uses Risk Priority Number (RPN) is used to determine the dominant failure or degradation modes in the strings and modules by means of ranking and prioritizing the modes. This study on PV power plants considers all the failure and degradation modes from both safety and performance perspectives.
The indoor and outdoor soiling studies were jointly performed by two Masters Students, Sravanthi Boppana and Vidyashree Rajasekar. This thesis presents the indoor soiling study, whereas the other thesis presents the outdoor soiling study. Similarly, the statistical risk analyses of two power plants (model J and model JVA) were jointly performed by these two Masters students. Both power plants are located at the same cold-dry climate, but one power plant carries framed modules and the other carries frameless modules. This thesis presents the results obtained on the frameless modules.Dissertation/ThesisMasters Thesis Engineering 201
Influence of graphene nanoparticles on optical and dielectric properties of PVA-PEDOT:PSS blend composite
No full textBibliometric Visualisation of Research Performance of Post COVID -19 and Mucormycosis: Where Do We Stand?
No full textPurpose: The second wave of the covid-19 pandemic has impacted global healthcare tremendously and mucormycosis associated with coronavirus disease is one of the deadly fungi that hit India in April 2021. An increasing number of research papers are upcoming with mucormycosis associated with coronavirus research and this paper aims at performing a bibliometric visualisation of all the available research on post covid-19 and mucormycosis.
Method: The Scopus database was selected and the search query (ALL (novel coronavirus 2019 OR coronavirus 2019 OR COVID 2019 OR COVID 19 OR nCOV OR SARSCoV2 OR COVID19) and (black fungus or white fungus or yellow fungus or mucormycosis) was developed on 25 May 2021 to retrieve all the bibliographic records on the domine of interest. VOSviewer software tool was used to constructing and visualising bibliometric networks to measure co-authors, countries, and institutions document citation, keyword metrics.
Results: A total of 154 documents were retrieved in the search, these were authored by 3,806 authors and published in 133 sources (journals, books, etc.). USA, India, and UK ware contributed the highest papers. Journal of Fungi (4), Heliyon (3), International Journal of Molecular Sciences (3), and Phytotherapy Research (3) are the journals that published the highest papers. Author per document was 24.7; Documents per author were 0.0405 and collaboration index was marked 26.5 during the period.
Conclusion: this bibliometric visualisation presents the qualitative and quantitative metrics for post-covid-19 and mucormycosis research and provides evidence that research in this domine is more in-depth than before. It is hoped that this well-directed research in different countries will provide new avenues for understanding diseases caused by mucormycosis associated with coronavirus.
Keywords: Bibliometric Visualisation; Post-Covid-19; Mucormycosis; Annual Growth Rate; Research Performance; Indi
Physico-chemical properties of PMMA/ZnO nanocomposite capped with 1-chloro-9,10-bis (phenyl ethynyl) anthracene
No full text
Non-HDL cholesterol: A valid surrogate marker to apolipoprotein b100 in type 2 diabetes mellitus patients in assessment of risk of cardiovascular diseases
No full textBackground: Considering the cardiovascular complications in Type 2 Diabetes Mellitus (T2DM) despite normal Total Cholesterol (TC) and Low Density Lipoprotein (LDL) levels, Non High Density Lipoprotein (non-HDL-C) and
Apolipoprotein B (ApoB) were added as secondary targets and have been increasingly acknowledged as measures of risk estimation for developing atherosclerotic Cardiovascular Disease (CVD). Aim and Objectives: To study the
correlation between ApoB100 and non-HDL-C in assessing the risk of cardiovascular complications in T2DM patients. Material and Methods: A total of 90 T2DM patients attending Medicine and Cardiology outpatient departments were recruited for the study. They were categorised into 2 groups -T2DM with CVD and T2DM without CVD. Three ml of fasting venous blood sample was taken from each patient and fasting blood sugar, TC, triglycerides, HDL-C and ApoB were estimated on VITROS 5600 Integrated Autoanalyser. LDL-C was calculated using Friedewald formula and non-HDL-C was calculated by subtracting HDL-C from TC. Results: The levels of ApoB and non-HDL-C in T2DM patients with CVD and without CVD were found to be significant with p < 0.001. There was a significant
correlation between ApoB and non-HDL-C values in both the groups as analysed by Karl Pearson's correlation coefficient(p <0.001). After linear regression analysis, non-HDL-C was found to have a strong correlation with ApoB100 in both the groups with r of 0.753 and 0.215 respectively (p < 0.001). Conclusion: The present study has demonstrated a strong correlation between ApoB and non-HDL-C in T2DM patients with or without CVD and hence can substitute for each other
Dimensional Stability and Retention Strength of Impressions to Custom Impression Trays Fabricated Using Conventional Method and Additive Technology - An In-vitro Study
No full textBackground:
3D printing technology is replacing manual fabrication in all fields. 3D-printed impression trays should be assessed as they could replace conventional impression trays in the future.
Aim:
In-vitro comparison and evaluation of the dimensional stability and retention strength of impressions to custom impression trays fabricated using conventional method and additive technology.
Materials and Methods:
A maxillary edentulous auto-polymerizing acrylic resin model served as the master model. Two moulds were prepared from the master model in order to obtain 12 casts. One cast was scanned for 3D printing digital light processing (DLP) and fused deposition modelling (FDM) 24 impression trays using polylactic acid (PLA). Twelve casts were used to fabricate light cure impression trays. Polyvinyl-siloxane impressions were made on the master model using 36 impression trays and 18 trays each were used to assess dimensional stability and retention strength.
Results:
In dimensional stability analysis, one sample t-test revealed a statistically significant difference between each group and the master model followed by a one-way ANOVA. There were significant differences, but the difference was less with FDM trays (P < 0.05). In retention strength analysis, one-way Analysis of variance (ANOVA) revealed statistically significant difference between each group and post-hoc test revealed specific difference, the highest with FDM trays (P < 0.05).
Conclusion:
Dimensional changes were observed at 30 minutes and 72 hours. Lesser dimensional changes were observed when impressions were made using FDM trays followed by DLP and light cure trays. The mean retention strength seen in descending order was FDM, followed by DLP and light cure trays. The best retention strength was noticed when impressions were made using FDM trays
Impact of commonly used agrochemicals on different fungal and bacterial bio-agents
No full textNot AvailableFour fungal bio-agents viz., Trichoderma harzianum, T. viride, Paecilomyces lilacinus and Pochonia
chlamydosporia and four bacterial bio-agents viz., Bacillus subtilis, B. pumilus, B. amyloliquefaciens and
Pseudomonas fluorescens were tested for their in vitro compatibility with five fungicides (carbendazim, captan,
mancozeb, copper oxychloride and fenamidone + mancozeb) and three pesticides (carbofuran, metam sodium and
acephate) at recommended doses of the pesticides and fungicides. The results revealed that carbendazim and metam sodium were highly toxic to all fungal bio-agents and copperoxychloride, mancozeb, fenamidone + mancozeb and metam sodium were highly toxic to all bacterial bio agents. T. harzianum exhibited more tolerance to captan than T. viride, P. chlamydosporia and P. lilacinus. All fungal bio-agents exhibited tolerance to carbofuran and acephate except P. chlamydosporia. Carbendazim was comparatively safer to B. subtilis, P. fluorescens and B. pumilus, but more toxic to B. amyloliquefaciens. P. fluorescens was relatively tolerant and Bacillus spp. was more sensitive to carbofuran and acephate. This study suggests that it is safe to integrate fungal bio-agents with copper oxychloride, carbofuran and acephate and bacterial bio-agents (except B. amyloliquefaciens) with carbendazimin integrated pest management (IPM) programmes.ICAR-IIH
