Institution
ARPA-E
Government•Washington D.C., District of Columbia, United States•
About: ARPA-E is a government organization based out in Washington D.C., District of Columbia, United States. It is known for research contribution in the topics: Population & Climate change. The organization has 1161 authors who have published 1267 publications receiving 30049 citations. The organization is also known as: Advanced Research Projects Agency - Energy.
Topics: Population, Climate change, Precipitation, Snow, Air quality index
Papers published on a yearly basis
Papers
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TL;DR: In this paper, physical and chemical properties of Saharan dust advections as observed in the Central Mediterranean basin, within the framework of the LIFE+10, DIAPASON project ( www.diapason-life.eu ).
33 citations
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TL;DR: In this paper, the authors used Lidar data to detect and characterise Saharan advection by means of reliable, operational techniques and calculated the increase in PM with respect to dust-unaffected previous days.
Abstract: . Particulate matter mass concentrations measured in the city of Rome (Italy) in the period 2001–2004 have been cross-analysed with concurrent Saharan dust advection events to infer the impact these natural episodes bear on the standard air quality parameter PM10 observed at two city stations and at one regional background station. Natural events such as Saharan dust advections are associated with a definite health risk. At the same time, the Directive 2008/50/EC allows subtraction of PM exceedances caused by natural contributions from statistics used to determine air quality of EU sites. In this respect, it is important to detect and characterise such advections by means of reliable, operational techniques. To assess the PM10 increase we used both the "regional-background method" suggested by EC Guidelines and a "local background" method, demonstrated to be most suited to this central Mediterranean region. In terms of exceedances, the two approaches provided results within ~20% of each other at background sites, and at ~50% of each other in traffic conditions. The sequence of Saharan advections over the city has been either detected by Polarization Lidar (laser radar) observations or forecast by the operational numerical regional mineral dust model BSC-DREAM8b of the Barcelona Supercomputing Centre. Lidar observations were also employed to retrieve the average physical properties of the dust clouds as a function of height. Over the four-year period, Lidar measurements (703 evenly distributed days) revealed Saharan plumes transits over Rome on 28.6% of the days, with minimum occurrence in wintertime. Dust was observed to reach the ground on 17.5% of the days totalling 88 episodes. Most (90%) of these advections lasted up to 5 days, averaging to ~3 days. Median time lag between advections was 7 days. Typical altitude range of the dust plumes was 0–6 km, with the centre of mass at ~3 km a.g.l. BSC-DREAM8b model simulations (1461 days) predicted Lidar detectable (532 nm extinction coefficient > 0.005 km−1) dust advections on 25.9% of the days, with ground contacts on 13% of the days. As in the Lidar case, the average dust centre of mass was forecast at ~3 km. Along the 703 day Lidar dataset, model forecast and Lidar detection of the presence of dust coincided on 80% of the cases, 92% coincidences are found within a ±1 day window. Combination of the BSC-DREAM8b and Lidar records leads to about 21% of the days being affected by presence of Saharan dust at the ground. This combined dataset has been used to compute the increase in PM with respect to dust-unaffected previous days. This analysis has shown Saharan dust events to exert a meaningful impact on the PM10 records, causing average increases of the order of 11.9 μg m−3. Conversely, PM10 increases computed relying only on the Lidar detections (i.e., presence of dust layers actually observed) were of the order of 15.6 μg m−3. Both analyses indicate the annual average contribution of dust advections to the city PM10 mass concentrations to be of the order of 2.35 μg m−3. The number of exceedances attributable to Saharan advections at the three station types addressed in this study (urban traffic, urban background and regional background) were found to be 25%, 30% and 43%, respectively. These results confirm Saharan advections in the central Mediterranean as important modulators of PM10 loads and exceedances.
33 citations
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TL;DR: In the framework of generalized Gaussian structures, by making use of the eigenvalue spectrum of the connectivity matrix, the averaged monomer displacement under local external forces as well as the mechanical relaxation quantities (storage and loss moduli) are determined.
Abstract: We numerically analyze the scaling behavior of experimentally accessible dynamical relaxation forms for polymer networks modeled by a finite multihierarchical structure. In the framework of generalized Gaussian structures, by making use of the eigenvalue spectrum of the connectivity matrix, we determine the averaged monomer displacement under local external forces as well as the mechanical relaxation quantities (storage and loss moduli). Hence we generalize the known analysis for both classes of fractals to the case of multihierarchical structure, for which even though we have a mixed growth algorithm, the above cited observables still give information about the two different underlying topologies. For very large lattices, reached via an algebraic procedure that avoids the numerical diagonalizations of the corresponding connectivity matrices, we depict the scaling of both component fractals in the intermediate time (frequency) domain, which manifests two different slopes.
33 citations
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TL;DR: The results indicate that low levels of nutrients are not a marker for low risk of P. rubescens proliferation and confirm that cyanobacterial density solely is not a reliable parameter to assess human exposure, and the ratio between toxic/non-toxic cells, and toxin concentrations, are much more diagnostic, although varying with time and environmental conditions.
33 citations
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TL;DR: In this article, the authors presented a physical model, PERMACLIM, which uses as input data a Climatic DataBase (CDB) and Digital Elevation Model (DEM) to calculate the Mean Annual Ground Surface Temperature (MAGST) for each point of the DEM including the snow buffering effect according to the heat conduction theory.
32 citations
Authors
Showing all 1165 results
Name | H-index | Papers | Citations |
---|---|---|---|
Antonio Russo | 88 | 934 | 34563 |
John V. Guttag | 62 | 254 | 17679 |
Mauro Rossi | 56 | 407 | 13056 |
Gianpaolo Balsamo | 54 | 131 | 31691 |
David Evans | 52 | 130 | 13455 |
Barbara Stenni | 44 | 148 | 10859 |
Luigi Bisanti | 42 | 104 | 8560 |
Marco Fontana | 42 | 384 | 7526 |
Andrea Ranzi | 42 | 101 | 8090 |
Dario Mirabelli | 37 | 127 | 3842 |
Marco Turco | 32 | 78 | 2709 |
Stefania La Grutta | 31 | 141 | 2691 |
Maurizio Forte | 28 | 135 | 2962 |
Gianluigi de Gennaro | 28 | 86 | 2853 |
Giovanni Martinelli | 27 | 104 | 2439 |