378 research outputs found
Numerical investigation of a porous media combustor in a small-scale diesel engine
No full textThe application of porous media in compression ignition engines has significant effects on its combustion behavior. In this work, a Computational Fluid Dynamics (CFD) analysis of combustion in diesel engine is performed for 100% load, and the effects of porous media addition in the combustion chamber are quantified. With a porosity of 66.7%, silicon carbide is applied as porous media of cylindrical shape in the modified piston bowl in the conventional engine. The combustion analysis outputs include average cylinder-pressure, temperature; Nitrogen Oxides (NOx), mean mixture fraction, turbulent kinetic energy, total energy and modified Peclet number. The results of the CFD study for the cases of non-porous media are validated against the performed baseline experimental analysis, whereas porous media predictions are compared to the state-of-the-art studies available in the literature. In presence of porous media, the average peak pressure and temperature are found to drop by similar to 26 bar and similar to 550 K, respectively, as compared to that of non-porous media. Furthermore, NOx emissions are significantly reduced up to 97%. The generation of turbulent kinetic energy is enhanced by 86% for PM leading to an increment of similar to 36% in the thermal energy conversion than without a porous media. (C) 2019 Elsevier Ltd. All rights reserved
Supplementary_figure_1 - Dietary Magnesium, Vitamin D, and Animal Protein Intake and Their Association to the Linear Growth Trajectory of Children from Birth to 24 Months of Age: Results From MAL-ED Birth Cohort Study Conducted in Dhaka, Bangladesh
No full textSupplementary_figure_1 for Dietary Magnesium, Vitamin D, and Animal Protein Intake and Their Association to the Linear Growth Trajectory of Children from Birth to 24 Months of Age: Results From MAL-ED Birth Cohort Study Conducted in Dhaka, Bangladesh by Subhasish Das, J. Johanna Sanchez, Ashraful Alam, Ahshanul Haque, Mustafa Mahfuz, Tahmeed Ahmed and Kurt Z. Long in Food and Nutrition Bulletin</p
Supplementary_figure_2 - Dietary Magnesium, Vitamin D, and Animal Protein Intake and Their Association to the Linear Growth Trajectory of Children from Birth to 24 Months of Age: Results From MAL-ED Birth Cohort Study Conducted in Dhaka, Bangladesh
No full textSupplementary_figure_2 for Dietary Magnesium, Vitamin D, and Animal Protein Intake and Their Association to the Linear Growth Trajectory of Children from Birth to 24 Months of Age: Results From MAL-ED Birth Cohort Study Conducted in Dhaka, Bangladesh by Subhasish Das, J. Johanna Sanchez, Ashraful Alam, Ahshanul Haque, Mustafa Mahfuz, Tahmeed Ahmed and Kurt Z. Long in Food and Nutrition Bulletin</p
Supplementary_table_1 - Dietary Magnesium, Vitamin D, and Animal Protein Intake and Their Association to the Linear Growth Trajectory of Children from Birth to 24 Months of Age: Results From MAL-ED Birth Cohort Study Conducted in Dhaka, Bangladesh
No full textSupplementary_table_1 for Dietary Magnesium, Vitamin D, and Animal Protein Intake and Their Association to the Linear Growth Trajectory of Children from Birth to 24 Months of Age: Results From MAL-ED Birth Cohort Study Conducted in Dhaka, Bangladesh by Subhasish Das, J. Johanna Sanchez, Ashraful Alam, Ahshanul Haque, Mustafa Mahfuz, Tahmeed Ahmed and Kurt Z. Long in Food and Nutrition Bulletin</p
The micro-environmental impact of volatile organic compound emissions from large-scale assemblies of people in a confined space
No full textLarge-scale assemblies of people in a confined space can exert significant impacts on the local air chemistry due to human emissions of volatile organics. Variations of air-quality in such small scale can be studied by quantifying fingerprint volatile organic compounds (VOCs) such as acetone, toluene, and isoprene produced during concerts, movie screenings, and sport events (like the Olympics and the World Cup). This review summarizes the extent of VOC accumulation resulting from a large population in a confined area or in a small open area during sporting and other recreational activities. Apart from VOCs emitted directly from human bodies (e.g., perspiration and exhaled breath), those released indirectly from other related sources (e.g., smoking, waste disposal, discharge of food-waste, and use of personal-care products) are also discussed. Although direct and indirect emissions of VOCs from human may constitute ��1% of the global atmospheric VOCs budget, unique spatiotemporal variations in VOCs species within a confined space can have unforeseen impacts on the local atmosphere to lead to acute human exposure to harmful pollutants. (C) 2016 Elsevier Inc All rights reserved.The corresponding author (KHK) acknowledges support from a National Research Foundation of Korea (NRF) grant funded by the Ministry of Education, Science and Technology (MEST) (No. 2006-0093848) and by the Cooperative Research Program for Agriculture Science & Technology Development (Project title: Study on model development to control odor from hog barn, Project No. 11010521), Rural Development Administration, Republic of Korea
Effects of Early Nutrition Supplementation Including Protein on Outcomes at Two Years of Age
No full textThesis embargoed until 9/2027
Assessment of Electrical Energy Consumption of Jai Hind Jal Prakalpa 90-101 in Kolkata, India
No full text
PRESENT SCENARIO OF GROUNDWATER TABLE IN SALINE PRONE AREAS OF PURBA MEDINIPUR IN WEST BENGAL, INDIA
No full textAqueous extracts of composted oil refinery sludge and their possible environmental impacts
No full textOil refinery sludge (ORS) management is a global concern, yet information on its low-cost biotransformation possibility is fairly limited. We present a novel approach for ORS mitigation by Eisenia fetida and Eudrilus eugeniae and aerobic composting (AC) in producing clean aqueous extracts (compost teas). Detailed physicochemical characterization, phytotoxicity assays, economic feasibility comparisons, and mathematical equation-based environmental and human health hazard prediction studies were done for all the earthworm and non-earthworm processed compost teas. The E. eugeniae-compost tea reduced Cr, Pb, Cu, Cd, and Zn contents by 52.7, 61.2, 41.8, 80, and 93.8%, respectively. The earthworm-sourced teas showed lower ecological risk (<300) than their aerobic counterparts. Seed germination in Pisum sativum and Cicer arietinum was 2–2.5 folds higher with vermi-derived tea application. Economic assessments illustrated the superiority of E. eugeniae-based biotransformation with higher cash flow and a lower payback time of 1.53 years. The mathematical predictions on human health showed no alarming status for any of the vermi/aerobic compost teas. Overall results implied that vermicomposting is safer and more beneficial than AC in the ORS bioconversion. However, this study warrants further research in exploring the efficiency of other earthworm species, feedstock selection, or seasonal variability in ORS management.
HIGHLIGHTS
The present work studies the usage of compost teas prepared from oil refinery sludge.;
Vermicomposting and aerobic composting techniques were used for bioconversion.;
The metal concentration decreased in the vermicompost-based compost teas.;
Seed germination indices were higher in the vermicompost-based compost teas.;
The risks associated with vermicompost-based compost teas were found to be minimal.
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