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Prashant Kumar

Bio: Prashant Kumar is an academic researcher from University of Surrey. The author has contributed to research in topics: Air quality index & Medicine. The author has an hindex of 54, co-authored 363 publications receiving 11561 citations. Previous affiliations of Prashant Kumar include Southeast University & Dr. B. R. Ambedkar National Institute of Technology Jalandhar.


Papers
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Journal ArticleDOI
TL;DR: In this paper, four geometrical configurations of a real street canyon in Barreiro city (Portugal) are considered to study their influence on the dispersion of PM.
Abstract: Four geometrical configurations of a real street canyon in Barreiro city (Portugal) are considered to study their influence on the dispersion of PM. These configurations include actual architectural layout of the street (Option 1), and three virtual cases (Options 1-3). Option 2 includes the modification of real geometry by including 4 m gaps between the buildings situated on the southern part of the street canyon. Option 3 considers 6 m gaps between buildings as opposed to 4 m gaps in Option 2. Option 4 assumes the same height for all buildings on the southern part of the street canyon, with no gaps between buildings. Computational fluid dynamics code (CFD), FLUENT, is used to simulate the detailed flow and turbulence characteristics in three-dimensional domain of chosen street canyon, together with the PM dispersion for both the summer and winter seasons. The modelled PM concentrations were then compared with the measured data at seven different locations in the street canyon. Our results indicate up to 23% lower PM concentrations at 1.5 m above the road level during the along-canyon wind direction due to the channelling of flow, compared with those observed during the cross-canyon wind direction. Detailed inspection of the results obtained from the Options 1-3 indicated that the spacing between the buildings tend to increase particle dilution during the cross-canyon winds, resulting in up to 20, and 22% reduced concentrations for options 2, and 3 respectively, compared with the actual configuration (Option 1). The largest improvement (∼7%) in the PM concentrations was given by Option 2, while other options showed modest changes. Possible reasons for these changes under varying meteorological conditions are explained in the context of changing building configurations and their implications in city planning. © 2013 Elsevier Ltd. All rights reserved.

17 citations

Journal Article
TL;DR: The subject of nanomaterials is very topical, with advances in knowledge made at a very rapid pace, making dissemination of this new knowledge a need of the hour as discussed by the authors.
Abstract: The subject of nanomaterials is very topical, with advances in knowledge made at a very rapid pace, making dissemination of this new knowledge a need of the hour. Although it is widely recognised that nanotechnology is playing a key role in many areas of societal endeavour, it is still unclear what risks certain nanomaterials may pose to humans and the environment. While nanotechnology has brought enormous benefits to humankind, its impact on human health and the environment is yet to be fully understood.

16 citations

Journal ArticleDOI
TL;DR: In this paper, daily simulations of tropospheric carbon monoxide (CO) and ozone (O3) have been made using MOZART-4 (Model for OZone And Related chemical Tracers version 4) during 2007-08.

16 citations

Journal ArticleDOI
TL;DR: In this article, the authors have presented a study of Indian Institute of Technology New Delhi, Hauz Khas, New Delhi 110016, India 3 School of Life Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK 4Nanotechnology and Molecular Sciences, School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia
Abstract: 1 Department of Civil & Environmental Engineering, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 7XH, UK 2Department of Civil Engineering, Indian Institute of Technology New Delhi, Hauz Khas, New Delhi 110016, India 3 School of Life Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK 4Nanotechnology and Molecular Sciences, School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4001, Australia

16 citations

Book ChapterDOI
01 Jan 2018
TL;DR: In this paper, the authors discuss the spatial distribution of air pollutants in cities in light of progress made by the scientific community in the field of flow and pollutant dispersion around buildings and within complex urban geometries.
Abstract: This chapter discusses the spatial distribution of air pollutants in cities in light of progress made by the scientific community in the field of flow and pollutant dispersion around buildings and within complex urban geometries. With the rate of urbanisation expected to increase in the next years, countries are forced to face challenges in addressing air pollution. Starting from the process of urbanisation and the problem of outdoor air pollution, the discussion focuses on main factors affecting flow and pollutant dispersion in cities. The dynamic of the urban atmosphere is sensitive to a large number of factors related to meteorology, building geometry and city density as well as to the presence of urban obstacles such as trees, parked cars and other barriers, buoyancy effects due to thermal exchanges at urban surfaces, traffic-induced turbulence and others. Some of them are reviewed here. The recent research towards unregulated pollutants, such as airborne ultrafine particles, which are considered to show higher health impacts compared with fine particles, is briefly addressed.

16 citations


Cited by
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Journal Article

4,293 citations

Journal Article
TL;DR: In this article, the authors present a document, redatto, voted and pubblicato by the Ipcc -Comitato intergovernativo sui cambiamenti climatici - illustra la sintesi delle ricerche svolte su questo tema rilevante.
Abstract: Cause, conseguenze e strategie di mitigazione Proponiamo il primo di una serie di articoli in cui affronteremo l’attuale problema dei mutamenti climatici. Presentiamo il documento redatto, votato e pubblicato dall’Ipcc - Comitato intergovernativo sui cambiamenti climatici - che illustra la sintesi delle ricerche svolte su questo tema rilevante.

4,187 citations

Journal ArticleDOI
François Mach, Colin Baigent, Alberico L. Catapano, Konstantinos C. Koskinas1, Manuela Casula, Lina Badimon1, M. John Chapman, Guy De Backer, Victoria Delgado, Brian A. Ference, Ian D. Graham, Alison Halliday, Ulf Landmesser, Borislava Mihaylova, Terje R. Pedersen, Gabriele Riccardi, Dimitrios J. Richter, Marc S. Sabatine, Marja-Riitta Taskinen, Lale Tokgozoglu, Olov Wiklund, Christian Mueller, Heinz Drexel, Victor Aboyans, Alberto Corsini, Wolfram Doehner, Michel Farnier, Bruna Gigante, Meral Kayıkçıoğlu, Goran Krstacic, Ekaterini Lambrinou, Basil S. Lewis, Josep Masip, Philippe Moulin, Steffen E. Petersen, Anna Sonia Petronio, Massimo F Piepoli, Xavier Pintó, Lorenz Räber, Kausik K. Ray, Željko Reiner, Walter F Riesen, Marco Roffi, Jean-Paul Schmid, Evgeny Shlyakhto, Iain A. Simpson, Erik S.G. Stroes, Isabella Sudano, Alexandros D Tselepis, Margus Viigimaa, Cecile Vindis, Alexander Vonbank, Michal Vrablik, Mislav Vrsalovic, José Luis Zamorano, Jean-Philippe Collet, Stephan Windecker, Veronica Dean, Donna Fitzsimons, Chris P Gale, Diederick E. Grobbee, Sigrun Halvorsen, Gerhard Hindricks, Bernard Iung, Peter Jüni, Hugo A. Katus, Christophe Leclercq, Maddalena Lettino, Béla Merkely, Miguel Sousa-Uva, Rhian M. Touyz, Djamaleddine Nibouche, Parounak H. Zelveian, Peter Siostrzonek, Ruslan Najafov, Philippe van de Borne, Belma Pojskic, Arman Postadzhiyan, Lambros Kypris, Jindřich Špinar, Mogens Lytken Larsen, Hesham Salah Eldin, Timo E. Strandberg, Jean Ferrières, Rusudan Agladze, Ulrich Laufs, Loukianos S. Rallidis, Laszlo Bajnok, Thorbjorn Gudjonsson, Vincent Maher, Yaakov Henkin, Michele Massimo Gulizia, Aisulu Mussagaliyeva, Gani Bajraktari, Alina Kerimkulova, Gustavs Latkovskis, Omar Hamoui, Rimvydas Šlapikas, Laurent Visser, P. Dingli, Victoria Ivanov, Aneta Boskovic, Mbarek Nazzi, Frank L.J. Visseren, Irena Mitevska, Kjetil Retterstøl, Piotr Jankowski, Ricardo Fontes-Carvalho, Dan Gaita, Marat V. Ezhov, Marina Foscoli, Vojislav Giga, Daniel Pella, Zlatko Fras, Leopoldo Pérez de Isla, Emil Hagström, Roger Lehmann, Leila Abid, Oner Ozdogan, Olena Mitchenko, Riyaz S. Patel 

4,069 citations

Journal ArticleDOI
TL;DR: In this article, the authors present guidelines for the management of patients with coronary artery disease (CAD), which is a pathological process characterized by atherosclerotic plaque accumulation in the epicardial arteries.
Abstract: Coronary artery disease (CAD) is a pathological process characterized by atherosclerotic plaque accumulation in the epicardial arteries, whether obstructive or non-obstructive. This process can be modified by lifestyle adjustments, pharmacological therapies, and invasive interventions designed to achieve disease stabilization or regression. The disease can have long, stable periods but can also become unstable at any time, typically due to an acute atherothrombotic event caused by plaque rupture or erosion. However, the disease is chronic, most often progressive, and hence serious, even in clinically apparently silent periods. The dynamic nature of the CAD process results in various clinical presentations, which can be conveniently categorized as either acute coronary syndromes (ACS) or chronic coronary syndromes (CCS). The Guidelines presented here refer to the management of patients with CCS. The natural history of CCS is illustrated in Figure 1.

3,448 citations

01 Jan 2015
TL;DR: The work of the IPCC Working Group III 5th Assessment report as mentioned in this paper is a comprehensive, objective and policy neutral assessment of the current scientific knowledge on mitigating climate change, which has been extensively reviewed by experts and governments to ensure quality and comprehensiveness.
Abstract: The talk with present the key results of the IPCC Working Group III 5th assessment report. Concluding four years of intense scientific collaboration by hundreds of authors from around the world, the report responds to the request of the world's governments for a comprehensive, objective and policy neutral assessment of the current scientific knowledge on mitigating climate change. The report has been extensively reviewed by experts and governments to ensure quality and comprehensiveness.

3,224 citations