11. Charge transport characterization of P3HT thin-film organic semiconductor : Written report: in fulfilment of diploma seminar 1FAF29 requirementMatija Filipčič, 2021, raz. nal. na višji ali visoki šoli Opis: The focus of this diploma seminar is to describe different types of charge transport theory and
models used for finding mobility in semiconductors, more specifically focused on P3HT thin-film
organic semiconductor. It also describes the time-of-flight method, which was used to measure the
experimental data for P3HT with time dependent current I(t) curve. Another data set was obtained
by performing Kinetic Monte Carlo (KMC) simulations using Miller-Abrahams hopping formalism.
KMC was used to determine the material disorder, simulate I(t) curve and transit time for every
charge carrier. Simulated data, different transit times and mobilities were then finally compared
with experimental, in order to find agreements between the two.
Ključne besede: charge transport, P3HT, thin-film organic semiconductor
Objavljeno v RUNG: 15.09.2021; Ogledov: 2243; Prenosov: 0
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12. Dynamic route map generation scheme for mobiles : M-governance application framework for tourism & travel in Delhi, IndiaRajan Gupta, Sunil K. Muttoo, Saibal K. Pal, 2016, objavljeni znanstveni prispevek na konferenci Opis: Easiness of public & tourist's travel within a city is an important task for central and State Government. They have to access a combination of public transport options like metros, trams, buses and private options like cabs services and hired vehicles. Delhi, being the capital city of India, enjoys the usage of public transport by millions of travelers. Currently all route information on mobile applications (be it public or private) are static in nature which does not recommend any route to follow. This paper proposes such an application where travelling gets easier based on real time route map generation for using public transport like Bus and Metro services. The client-server based 3-tier architecture has been used for the mobile application designing. The application scores high on ease of travelling and customization of the routes through recommendations as compared to static application.
Ključne besede: M-governance, dynamic route map, Delhi tourism, public transport system, mobile application framework
Objavljeno v RUNG: 16.07.2021; Ogledov: 2104; Prenosov: 144
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13. Modeling the multiday evolution and aging of secondary organic aerosol during MILAGRO 2006Katja Džepina, Christopher D. Cappa, Rainer Volkamer, Sasha Madronich, Peter F. DeCarlo, Rahul A. Zaveri, Jose L. Jimenez, 2011, izvirni znanstveni članek Opis: In this study, we apply several recently proposed models to the evolution of secondary organic aerosols (SOA) and organic gases advected from downtown Mexico City at: an altitude of similar to 3.5 km during three days of aging, in a way that is directly comparable to simulations in regional and global models. We constrain the model with and compare its results to available observations. The model SOA formed from oxidation of volatile organic compounds (V-SOA) when using a non-aging SOA parameterization cannot explain the observed SOA concentrations in aged pollution, despite the increasing importance of the low-NO, channel. However, when using an aging SOA parameterization, V-SOA alone is similar to the regional aircraft observations, highlighting the wide diversity in current V-SOA formulations. When the SOA formed from oxidation of semivolatile and intermediate volatility organic vapors (SI-SOA) is computed following Robinson et al. (2007) the model matches the observed SOA mass, but its 0/C is similar to 2 x too low. With the parameterization of Grieshop et al. (2009), the total SOA mass is similar to 2 x too high, but 0/C and volatility are closer to the observations. Heating or dilution cause the evaporation of a substantial fraction of the model SOA; this fraction is reduced by aging although differently for heating vs dilution. Lifting of the airmass to the free-troposphere during dry convection substantially increases SOA by condensation of semivolatile vapors; this effect is reduced by aging.
Ključne besede: Mexico-city, volatility, semivolatile, transport, campaign
Objavljeno v RUNG: 11.04.2021; Ogledov: 1945; Prenosov: 0
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14. Atmospheric peroxyacetyl nitrate (PAN) : a global budget and source attributionE. V. Fischer, D. J. Jacob, R. M. Yantosca, M. P. Sulprizio, D. B. Millet, Jiandong Mao, F. Paulot, H. B. Singh, A. Roiger, Katja Džepina, 2014, izvirni znanstveni članek Opis: Peroxyacetyl nitrate (PAN) formed in the atmospheric oxidation of non-methane volatile organic compounds (NMVOCs) is the principal tropospheric reservoir for nitrogen oxide radicals (NOx = NO + NO2). PAN enables the transport and release of NOx to the remote troposphere with major implications for the global distributions of ozone and OH, the main tropospheric oxidants. Simulation of PAN is a challenge for global models because of the dependence
of PAN on vertical transport as well as complex and uncertain NMVOC sources and chemistry. Here we use an improved representation of NMVOCs in a global 3-D chemical
transport model (GEOS-Chem) and show that it can simulate PAN observations from aircraft campaigns worldwide.
The immediate carbonyl precursors for PAN formation include acetaldehyde (44 % of the global source), methylglyoxal (30 %), acetone (7 %), and a suite of other isoprene and
terpene oxidation products (19 %). A diversity of NMVOC
emissions is responsible for PAN formation globally including isoprene (37 %) and alkanes (14 %). Anthropogenic
sources are dominant in the extratropical Northern Hemisphere outside the growing season. Open fires appear to play
little role except at high northern latitudes in spring, although
results are very sensitive to plume chemistry and plume rise.
Lightning NOx is the dominant contributor to the observed
PAN maximum in the free troposphere over the South Atlantic.
Ključne besede: peroxyacetyl nitrate, non-methane volatile organic compounds, global 3-D chemical transport model, GEOS-chem
Objavljeno v RUNG: 11.04.2021; Ogledov: 2327; Prenosov: 0
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15. Morphology and mixing state of aged soot particles at a remote marine free troposphere site : implications for optical propertiesSwarup China, Barbara Scarnato, Robert C. Owen, Bo Zhang, MarianT. Ampadu, Sumit Kumar, Katja Džepina, Michael P. Dziobak, Paulo Fialho, Judith A. Perlinger, 2015, izvirni znanstveni članek Opis: The radiative properties of soot particles depend on their morphology and mixing state, but their evolution during transport is still elusive. Here we report observations from an electron microscopy analysis of individual particles transported in the free troposphere over long distances to the remote Pico Mountain Observatory in the Azores in the North Atlantic. Approximately 70% of the soot particles were highly compact and of those 26% were thinly coated. Discrete dipole approximation simulations indicate that this compaction results in an increase in soot single scattering albedo by a factor of <= 2.17. The top of the atmosphere direct radiative forcing is typically smaller for highly compact than mass-equivalent lacy soot. The forcing estimated using Mie theory is within 12% of the forcing estimated using the discrete dipole approximation for a high surface albedo, implying that Mie calculations may provide a reasonable approximation for compact soot above remote marine clouds.
Ključne besede: atmospheric aerosol, soot, long-range transport, free troposphere, single scattering albedo
Objavljeno v RUNG: 11.04.2021; Ogledov: 2064; Prenosov: 0
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16. Ice cloud formation potential by free tropospheric particles from long-range transport over the Northern Atlantic OceanSwarup China, Peter A. Alpert, Bo Zhang, Simeon K. Schum, Katja Džepina, Kendra Wright, R. Chris Owen, Paulo Fialho, Lynn R. Mazzoleni, Claudio Mazzoleni, 2017, izvirni znanstveni članek Opis: Long-range transported free tropospheric particles can play a significant role on heterogeneous ice nucleation. Using optical and electron microscopy we examine the physicochemical characteristics of ice nucleating particles (INPs). Particles were collected on substrates from the free troposphere at the remote Pico Mountain Observatory in the Azores Islands, after long-range transport and aging over the Atlantic Ocean. We investigate four specific events to study the ice formation potential by the collected particles with different ages and transport patterns. We use single-particle analysis, as well as bulk analysis to characterize particle populations. Both analyses show substantial differences in particle composition between samples from the four events; in addition, single-particle microscopy analysis indicates that most particles are coated
by organic material. The identified INPs contained mixtures of dust, aged sea salt and soot, and organic material acquired either at the source or during transport. The temperature and relative humidity (RH) at which ice formed, varied only by 5% between samples, despite differences in particle composition, sources, and transport patterns. We hypothesize that this small variation in the onset RH may be due to the coating material on the particles. This study underscores and motivates the need to further investigate how long-range transported and atmospherically aged free tropospheric particles impact ice cloud formation.
Ključne besede: atmospheric aerosols, ice nucleating particles, long-range transport, optical microscopy, electron microscopy, Pico Mountain Observatory
Objavljeno v RUNG: 11.04.2021; Ogledov: 2304; Prenosov: 133
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17. Electron transfer complexes : experimental mapping of the Redox-dependent Cytochrome C electrostatic surfaceMatteo De March, Rita De Zorzi, N. Demitri, Chiara Gabbiani, A. Guerri, A. Casini, Luigi Messori, S. Geremia, 2012, zaključena znanstvena zbirka raziskovalnih podatkov Ključne besede: electron transfer complexes, electron transport, Equus caballus, mutations
Objavljeno v RUNG: 17.03.2021; Ogledov: 1988; Prenosov: 10
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18. Electron transfer complexes : experimental mapping of the Redox-dependent Cytochrome C electrostatic surfaceMatteo De March, Rita De Zorzi, A. Casini, Luigi Messori, S. Geremia, N. Demitri, Chiara Gabbiani, A. Guerri, 2012, zaključena znanstvena zbirka raziskovalnih podatkov Ključne besede: crystal structures, electron transport, Equus caballus, mutations
Objavljeno v RUNG: 17.03.2021; Ogledov: 2001; Prenosov: 10
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