21. Real-time characterization and source apportionment of fine particulate matter in the Delhi megacity area during late winterVipul Lalchandan, Varun Kumar, Anna Tobler, M.T. Navaneeth, Suneeti Mishra, J. G. Slowik, Deepika Bhattu, Pragati Rai, Rangu Satish, Dilip Ganguly, Tiwari Tiwari, Neeraj Rastogi, Tiwari Sashi, Griša Močnik, André S. H. Prévôt, Sachchida Tripathi, 2021, original scientific article Abstract: National Capital Region (NCR) encompassing New Delhi is one of the most polluted urban metropolitan areas in the world.
Real-time chemical characterization of fine particulate matter (PM1 and PM2.5) was carried out using three aerosol mass
spectrometers, two aethalometers, and one single particle soot photometer (SP2) at two sites in Delhi (urban) and one site located
~40 km downwind of Delhi, during January-March, 2018. The campaign mean PM2.5 (NR-PM2.5 + BC) concentrations at the two
urban sites were 153.8±109.4 μg.m-3 and 127.8±83.2 μg.m-3, respectively, whereas PM1 (NR-PM1 + BC) was 72.3 ± 44.0 μg.m-3
at the downwind site. PM2.5 particles were composed mostly of organics (43-44)% followed by chloride (14-17)%, ammonium
(9-11)%, nitrate (9%), sulfate (8-10)%, and black carbon (11-16)%, whereas PM1 particles were composed of 47% organics,
13% sulfate as well as ammonium, 11% nitrate as well as chloride, and 5% black carbon. Organic aerosol (OA) source
apportionment was done using positive matrix factorization (PMF), solved using an advanced multi-linear engine (ME-2) model.
Highly mass-resolved OA mass spectra at one urban and downwind site were factorized into three primary organic aerosol
(POA) factors including one traffic-related and two solid-fuel combustion (SFC), and three oxidized OA (OOA) factors.
Whereas unit mass resolution OA at the other urban site was factorized into two POA factors related to traffic and SFC, and one
OOA factor. OOA constituted a majority of the total OA mass (45-55)% with maximum contribution during afternoon hours
~(70-80)%. Significant differences in the absolute OOA concentration between the two urban sites indicated the influence of local emissions on the oxidized OA formation. Similar PM chemical composition, diurnal and temporal variations at the three
sites suggest similar type of sources affecting the particulate pollution in Delhi and adjoining cities, but variability in mass concentration suggest more local influence than regional.
Keywords: source apportionment, air pollution, particulate matter, Delhi
Published in RUNG: 25.01.2021; Views: 3367; Downloads: 0
This document has many files! More... |
22. Immobilization of Redox-Responsive Switches Into Calixarene-Based Covalent Organic Polymers for Environmental ApplicationsTina Skorjanc, Dinesh Shetty, Sudhir Kumar Sharma, Jesus Raya, Dong Suk Han, Ramesh Jagannathan, Ali Trabolsi, 2017, unpublished conference contribution Keywords: calixarene, redox switches, dye adsorption
Published in RUNG: 03.09.2020; Views: 2357; Downloads: 0
This document has many files! More... |
23. |
24. Morphological diversity in nanoporous covalent organic materials derived from viologen and pyreneGobinda Das, Tina Škorjanc, Sudhir Kumar Sharma, Thirumurugan Prakasam, Carlos Platas-Iglesias, Dong Suk Han, Jesus Raya, John-Carl Olsen, Ramesh Jagannathan, Ali Trabolsi, original scientific article Keywords: covalent organic polymers, hollow tube, polymers, porous materials, iodine capture
Published in RUNG: 02.09.2020; Views: 2558; Downloads: 0
This document has many files! More... |
25. Botanična terminologija v govoru vasi ŠempasTanja Maučec, 2020, undergraduate thesis Abstract: V diplomski nalogi predstavljam botanično terminologijo, ki je v rabi v vasi Šempas. Vas leži v spodnji Vipavski dolini, njen govor pa spada v kraško narečje primorske narečne skupine. V prvem delu naloge je kratka geografska in zgodovinska predstavitev vasi z ljudskoetimološkimi razlagami ter etimološko razlago izvora naselbinskega lastnega imena Šempas. Sledi analiza govora, in sicer njegov fonološki opis ter opis njegovih osnovnih oblikoslovnih značilnosti. Temu je dodan fonetični zapis govora informatorja. Osrednji del naloge predstavlja po abecednem redu razvrščen slovar botaničnega izrazja. Slovar, ki vsebuje izbrane lekseme s področja botanike, pri čemer sem se osredotočila predvsem na pomensko polje vrt, obsega 118 gesel. Besedišče sem zbrala v pogovoru z informatorjem, s pomočjo lastnega opazovanja ter z Vprašalnico za zbiranje narečnega gradiva: Vprašalnica za sadovnjak, vrt, polje (1994) Francke Benedik.
Keywords: jezikoslovje, dialektologija, primorska narečna skupina, kraško narečje, govor vasi Šempas, slovar, botanična terminologija
Published in RUNG: 11.08.2020; Views: 3655; Downloads: 92
 Full text (1,59 MB) |
26. |
27. |
28. |
29. |
30. Crystal habit modification of Cu(II) isonicotinate-N-oxide complexes using gel phase crystallisationDipankar Ghosh, Katja Ferfolja, Žygimantas Drabavičius, Jonathan Steed, Krishna Kumar Damodaran, 20, original scientific article Abstract: We report the crystallisation of three forms of copper(II) isonicotinate-N-oxide complex and their phase interconversion via solvent-mediated crystal to crystal transformation. The different forms of copper complex have been isolated and characterised by single crystal X-ray diffraction. Gel phase crystallisation performed in hydrogels, low molecular weight gels and gels of tailored gelator showed crystal habit modification. Crystallisation in aqueous ethanol resulted in concomitant formation of blue (form-I) and green (form-II/IV) crystals while use of low molecular weight gel results in selective crystallization of the blue form-I under identical conditions. Comparison of gel phase and the solution state crystallisation in various solvent compositions reveals that the blue form-I is the thermodynamically stable form under ambient conditions.
Keywords: copper(II) complex, gel phase crystallisation, crystal habit modification, isonicotinate-N-oxide, X-ray diffraction
Published in RUNG: 08.11.2018; Views: 3359; Downloads: 0
This document has many files! More... |
