1,487 research outputs found
From old to new: roles of protein sources and individual amino acids in clinical nutrition.
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Impact of sea level rise and tidal effects on flux-controlled and partially isolated shallow aquifer on the southeast coast of India
No full textA rise in sea level is the most important threat to the coastal aquifers in which the intensity of threat also depends on the local hydrogeological settings. The present study seeks to identify the impacts of sea level rise and tidal effects on the shallow and complex aquifer located south of Chennai, India. The aquifer geometry is isolated dune surfaces due to the presence of enclosing saline surface water. The freshwater is available as an elongated lens, and replenishment occurs by rainfall, with limited regional influx. Numerical simulation was carried out to understand the response of groundwater table to sea level rise until the year 2100. Initially, the tidal effects were investigated for the duration of 3 years. A sinusoidal fluctuation of groundwater table is noticed only in the northern part and the tidal impact seems infinitesimal because of steep hydraulic gradient in the south. Simulation of groundwater table without considering sea level rise predicts a decline in the elevation of groundwater table/freshwater lens by − 0.35 m in the dune surfaces. The simulation with reported sea level rise of 2 mm year −1 with the same rate of groundwater pumping results in a total increase of 0.5 m in groundwater table. The study infers that the tidal effects are high in the shallow groundwater gradient, and sea level rise will be beneficial to the isolated coastal freshwater aquifers by increasing the elevation of groundwater table/freshwater lens and further deepening the interface between seawater and freshwater
Discrete Boltzmann Equation model of polydisperse shallow granular flows
No full textA polydisperse shallow mixture consisting of N p solid phases (N p ≥ 1) and one fluid phase (the ambient fluid) is a reliable model for several industrial and environmental flows, as e.g. landslides, avalanches, debris flows and fluidized beds. The description and prediction of these flows is of primary importance, mainly with respect to the mitigation and protection from natural hazards. This paper is aimed at deriving the polydisperse shallow granular flow equations by depth-averaging mass and momentum equations of the mixture and at formulating an equivalent Discrete Boltzmann Equation (hereinafter DBE) model as solution method. The reason is the simplicity and the versatility of the DBE, which consists of a set of purely advective, linear, first order partial differential equations, whose numerical integration does not need sophisticated methods. Both 1D and 2D benchmarks, concerning with the propagation of discontinuities in three-phase shallow granular flows, are obtained by applying the finite differences Lax-Friedrichs (hereinafter LF) method to the polydisperse shallow granular flow equations. The overall agreement is good, showing that the DBE and the LF numerical results are equivalent
A box-model approach for reservoir operation during extreme rainfall events: A case study
No full textExtreme rainfall events in an urban area pose various challenges to the water resource managers in terms of flood mitigation, inundation, water conservation and harvesting for drinking water supply. The objective of this study is to apply the box-model approach to evaluate reservoir operation during extreme rainfall events. A large water supply reservoir in Chennai was chosen to carry out this study. A box model, based on input–output parameters, is proposed to simulate the reservoir operation and hydraulic behaviour. Hydrologic Engineering Centre-Hydrologic Modelling System (HEC-HMS) has been used to simulate the reservoir inflow hydrograph and to understand the run-off characteristics of the basin. Three extreme rainfall events occurred in past have been selected for the analysis. Three different scenarios have been framed to assess the reservoir performance. Reducing the initial storage to 50% and releasing water at the beginning of the event gives a possible solution for flood mitigation in reducing the outflow volume by 9–37% and delaying the time to peak by 1–6 h. Though the reduced outflow volume from this reservoir is less, it can help to mitigate the flood inundation to a significant extent. Thus the box-model approach presented here can be utilised as a simple tool to generate the various combinations of outflow hydrographs for any reservoir
A novel approach to enhance the mechanical behavior of glass epoxy laminates with sustainable recycled milled fillers
No full textThe aerospace, automotive, and energy industries can use fiber-reinforced composites due to their high specific strength and stiffness. However, unexpected external impacts in work cause internal damage and residual strength loss in composite structures. Another ongoing issue is the sustainable management of composite materials' end-of-life. The quasi-static indentation properties of glass epoxy composites are investigated in this study using different kinds of novel filler materials that are recycled from old composite materials: recycled milled carbon (rmCF), recycled milled Kevlar filler (rmKF), and an innovative hybrid filler (rmBF) composed of recycled milled carbon and Kevlar fillers (rmBF). Surface roughness and hardness studies assessed the quasi-static indentation (QSI) response of neat glass epoxy and glass epoxy composites loaded with fillers using indentation force, absorbed energy, residual dent depth, and evolution of damage area. Compared to the baseline samples, the rmCF composites performed exceptionally well, showing a 16% increase in peak force, a 59% decrease in damaged area, and a 6.32% and 22.5% reduction in surface roughness, respectively (Ra and Sa). After QSI tests, rmC filler samples had 26.8% higher residual flexural strength than neat glass epoxy composites in a three-point bending test. Through toughening mechanisms like filler interlocking and bridging, micrographs captured using a scanning electron microscope (SEM) showed that recycled fillers provide a higher level of stiffness, better energy dissipation, less damaged area, and overall improved hardness.HighlightsRecycled milled carbon (rmCF) and Kevlar hybrid fillers (rmKF) have been integrated into glass/epoxy composites.The damage tolerance of glass epoxy composites was as a whole significantly improved by the rmCF integration.The Kevlar fillers' inadequate adhesion and interlaminar shear strength were compensated for by the Hybrid fillers (rmBF).Micrographs taken with a scanning electron microscope (SEM) clearly show the fillers' role in the resistance to damage propagation processes.Influence of recycled milled fillers on the damage tolerance of Glass epoxy composites.imag
A bibliometric analysis of highly cited papers from India in Science Citation Index Expanded
No full textElango, B. and Ho, Y.S. ；2017, A bibliometric analysis of highly cited papers from India in Science Citation Index Expanded. Current Science, 112 ；8, 1653-1658.[[abstract]]The aim of the present study is to analyse the highly cited papers from India. The Science Citation
Index Expanded database was used to retrieve the related bibliographic records. Grouping and
reclassification of institutions with misspellings and variants have been done. The most productive
institutions, collaborating partners and Y-index of the contributing authors were examined. Results
revealed that all the highly cited papers from India did not receive citations in the early years after
publication. Co-authored (or international collaboration) papers received more citation impact
than single-authored ones. USA was the preferred collaborative partner for international collaboration.
The Indian Institutes of Technology, CSIR organizations, and Indian Institute of Science,
Bengaluru were the leading Indian institution
One Hundred Scopus Citations to a Non-Scopus Indexed Article: A Case Study
No full textReceiving 100 citations from indexed journals is not a common occurrence, although it does happen very rarely, and it is even more uncommon for a non-indexed article. Given this, the purpose of this present study is to perform a bibliometric analysis of 100 cited Scopus articles to a non-Scopus indexed article, using a case study of the article titled “Authorship trends and collaboration pattern in the marine sciences literature: A scientometric study” which was published by Elango and Rajendran in the International Journal of Information Dissemination and Technology in 2012. On October 15, 2022, the Scopus database was searched with the article title in the references field, and the resulting bibliographic data was exported as a comma-separated values file. The tools utilized for this analysis were ScientoPy, the Bibliometrix R Package, and VOSviewer. Based on the findings, most of the cited articles were published within the last three years, and international researchers have given more recognition compared to Indian researchers. The most popular topics were found to be bibliometrics, bibliometric analysis, and bibliometrix. The fact that all 100 cited articles were published across various subject disciplines used by Scopus to categorise sources demonstrates how well-established the citing article is within the scientific community
Impact of institutional reforms and industry structural factors on market returns of emerging market rivals during acquisitions by foreign firms
No full textThis paper seeks to understand the joint impact of institutional reforms and industry structural factors on market returns earned by rivals in an emerging market during foreign acquisitions. We use a sample of 238 foreign acquisitions in India during the period 2004–2013 and find empirical evidence to support the notion that institutional reforms, foreign competition and business group competition positively impact the market returns of the rivals of acquired firms. Additionally, we find that the effects of foreign competition and business group competition on rivals’ market returns are shaped by the degree of institutional reforms in the industry, indicating that firms’ market returns in emerging markets during foreign acquisitions can be better understood through the incorporation of the joint role of industry structural factors and institutional reforms
A discrete Boltzmann equation model for two-phase shallow granular flows
No full textIn this paper a Discrete Boltzmann Equation model (hereinafter DBE) is proposed as solution method of the two-phase shallow granular flow equations, a complex nonlinear partial differential system, resulting from the depth-averaging procedure of mass and momentum equations of granular flows. The latter, as e.g. a debris flow, are flows of mixtures of solid particles dispersed in an ambient fluid.The reason to use a DBE, instead of a more conventional numerical model (e.g. based on Riemann solvers), is that the DBE is a set of linear advection equations, which replaces the original complex nonlinear partial differential system, while preserving the features of its solutions. The interphase drag function, an essential characteristic of any two-phase model, is accounted for easily in the DBE by adding a physically based term. In order to show the validity of the proposed approach, the following relevant benchmark tests have been considered: the 1D simple Riemann problem, the dam break problem with the wet-dry transition of the liquid phase, the dry bed generation and the perturbation of a state at rest in 2D. Results are satisfactory and show how the DBE is able to reproduce the dynamics of the two-phase shallow granular flow
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