Filters








2,333 Hits in 2.8 sec

Apprendere l'italiano oggi

Paola Micheli
2008 Revista de Italianística  
O fenômeno da imigração na Itália abriu novas perspectivas ao processo de ensino/aprendizagem.  ...  200 0 , p rom ossa dal M inistero degli Affari E steri, affidata al D ipartim ento di Studi Linguistici e L etterari dell'U niversità di Rom a "La Sapienza" e realizzata sotto la direzione di Tullio De  ...  pubblici stranieri dell'italiano; ai tra tti m etodologici dell'offerta form ativa; al quadro generale delle condizioni che d eterm in ano la posizione e lo sviluppo della n o stra lingua nel m on do.1 (De  ... 
doi:10.11606/issn.2238-8281.v0i17p13-21 fatcat:ertyspog3vhn5mkdkcnijauwsa

Preface

Paola De Michelis, Gerald Duma
2013 Annals of Geophysics  
Paola De Michelis Gerald Duma Istituto Nazionale di Geofisica Central Institute for Meteorology e Vulcanologia, Roma, Italy and Geodynamics, Vienna, Austria  ... 
doi:10.4401/ag-6313 fatcat:vamreyyfivbudavalxzq3uig2u

MOESM4 of Unmodelled magnetic contributions in satellite-based models

Roberta Tozzi, Mioara Mandea, Paola De Michelis
2016 Figshare  
Additional file 4: Figure C2. a and b Swarm C residuals dH of the horizontal component H of the geomagnetic field mapped for different levels of geomagnetic activity according to Sym-H index (|Sym-H| ≤ 5 nT and |Sym-H| ≥ 20 nT, respectively); c difference of dH distribution between disturbed (|Sym-H| ≥ 20 nT) and quiet conditions (|Sym-H| ≤ 5 nT). Residuals are displayed for SM latitudes between 50° S and 50° N and the whole DLT range.
doi:10.6084/m9.figshare.c.3631688_d12 fatcat:gpxu3fumbbbytey66hv2hfj7da

MOESM2 of Unmodelled magnetic contributions in satellite-based models

Roberta Tozzi, Mioara Mandea, Paola De Michelis
2016 Figshare  
Additional file 2: Figure C1. Swarm C residuals dY of the Eastward component Y of the geomagnetic field mapped according to IMF B y â B z polarity sectors. Residuals are displayed for SM latitudes between 50° S and 50° N and the whole DLT range.
doi:10.6084/m9.figshare.c.3631688_d5 fatcat:m2nhdp2hhbb4tibs5uhi2pwkgu

MOESM1 of Unmodelled magnetic contributions in satellite-based models

Roberta Tozzi, Mioara Mandea, Paola De Michelis
2016 Figshare  
Additional file 1: Figure B1. Swarm B residuals dY of the Eastward component Y of the geomagnetic field mapped according to IMF B y â B z polarity sectors. Residuals are displayed for SM latitudes between 50° S and 50° N and the whole DLT range.
doi:10.6084/m9.figshare.c.3631688_d2.v1 fatcat:3lbcvt5bsjaothtlieiojufw7y

MOESM3 of Unmodelled magnetic contributions in satellite-based models

Roberta Tozzi, Mioara Mandea, Paola De Michelis
2016 Figshare  
Additional file 3: Figure B2. a and b Swarm B residuals dH of the horizontal component H of the geomagnetic field mapped for different levels of geomagnetic activity according to Sym-H index (|Sym-H| ≤ 5 nT and |Sym-H| ≥ 20 nT, respectively); c difference of dH distribution between disturbed (|Sym-H| ≥ 20 nT) and quiet conditions (|Sym-H| ≤ 5 nT). Residuals are displayed for SM latitudes between 50° S and 50° N and the whole DLT range.
doi:10.6084/m9.figshare.c.3631688_d10.v1 fatcat:dlcolhaxizhn5p3cvn4xtycanm

Unmodelled magnetic contributions in satellite-based models

Roberta Tozzi, Mioara Mandea, Paola De Michelis
2016 Earth, Planets and Space  
Michelis et al. 1999 Fig. 2 a, b Residuals dH of the horizontal component H of the geomagnetic field mapped for different levels of geomagnetic activity according to Sym-H index (|Sym-H| ≤ 5 nT and  ...  part of the ring current, namely the partial ring current, that flows westward far from both the satellites, thus causing an asymmetric decrease in the horizontal component of the geomagnetic field (De  ... 
doi:10.1186/s40623-016-0484-3 fatcat:ymvlqpptqrciljdk36oqru66uy

A global analysis of the 1991 geomagnetic jerk

Paola De Michelis, Lili Cafarella, Antonio Meloni
2000 Geophysical Journal International  
Using ®rst differences of the Y (east geomagnetic ®eld component) mean values from 74 observatories, the worldwide character of the 1991 impulse has been determined (De Michelis et al. 1998) .  ...  De Santis of the Istituto Nazionale di Geo®sica for useful discussions and comments. Special thanks to Prof. E. Boschi of the Istituto Nazionale di Geo®sica for supporting this work.  ...  However, the distribution of DYkk for this jerk is strikingly similar to the distribution of the DYkk for the 1969 and 1978 events (De Michelis et al. 1998) .  ... 
doi:10.1046/j.1365-246x.2000.00208.x fatcat:r47oyy26srcefehwftagv26xwq

Pressure-Gradient Current at High Latitude from Swarm Measurements

Giulia Lovati, Paola De Michelis, Giuseppe Consolini, Francesco Berrilli
2022 Remote Sensing  
The pressure-gradient current is among the weaker ionospheric current systems arising from plasma pressure variations. It is also called diamagnetic current because it produces a magnetic field which is oriented oppositely to the ambient magnetic field, causing its reduction. The magnetic reduction can be revealed in measurements made by low-Earth orbiting satellites flying close to ionospheric plasma regions where rapid changes in density occur. Using geomagnetic field, plasma density and
more » ... ron temperature measurements recorded on board ESA Swarm A satellite from April 2014 to March 2018, we reconstruct the flow patterns of the pressure-gradient current at high-latitude ionosphere in both hemispheres, and investigate their dependence on magnetic local time, geomagnetic activity, season and solar forcing drivers. Although being small in amplitude these currents appear to be a ubiquitous phenomenon at ionospheric high latitudes characterized by well defined flow patterns, which can cause artifacts in the main field models. Our findings can be used to correct magnetic field measurements for diamagnetic current effect, to improve modern magnetic field models, as well as to understand the impact of ionospheric irregularities on ionospheric dynamics at small-scale sizes of a few tens of kilometers.
doi:10.3390/rs14061428 fatcat:orhdlbjzi5e3tdpw73zxqedahe

Magnetic field fluctuation features at Swarm's altitude: A fractal approach

Paola De Michelis, Giuseppe Consolini, Roberta Tozzi
2015 Geophysical Research Letters  
Michelis, 1998].  ...  Michelis, 1998; 107 Wanliss, 2005].  ... 
doi:10.1002/2015gl063603 fatcat:oeo3vvcounga7fxuwraw36eafi

Latitudinal dependence of geomagnetically induced currents during geomagnetic storms

Roberta Tozzi, Igino Coco, Paola De Michelis, Fabio Giannattasio
2018 Annals of Geophysics  
. , 2016 de Villiers et al., 2017; Moldwin et al., 2016] . At these latitudes, the EEJ flows in the E-region of the dayside ionosphere (altitudes of around 100 kilometres).  ...  Geomagnetic latitude °N Geomagnetic longitude °E Difference in hours between UT 0 and MLT DRV Dumont d'Urville -74.96 -127.96 -13 PAF Port-aux-Francais -57.26 131.21 +4 AMS Martin de  ... 
doi:10.4401/ag-7788 fatcat:lhsqkltawvej3nchgkeca47q2e

Preface of the special issue "From the Sun to the Earth's Interior"

Paola De Michelis, Michael Pezzopane, Giuseppe Consolini, Umberto Villante
2019 Annals of Geophysics  
doi:10.4401/ag-8166 fatcat:uyhjcqpo5zgerdonubshlfzueu

MANGANESE RECOVERING FROM ALKALINE SPENT BATTERIES BY AMMONIUM PEROXODISULFATE

Paola Macolino, Adriana Loredana Manci, Ida De Michelis, Muresan Silviu Anton, Petru Ilea, Francesco Veglio
2013 Acta Metallurgica Slovaca  
The process of manganese removal from spent battery leaching solutions, with ammonium peroxodisulfate, prior to recovery of zinc by electrolysis is presented. The experiments were carried out according to a 2 3 full factorial design considering ammonium peroxodisulfate concentration, temperature and pH as factors investigated. The analysis of variance (ANOVA) was carried out on the precipitation yields of Mn and Zn after 30 min, 1h, 2h and 3h of reaction. Optimal conditions for obtaining Mn as
more » ... nO 2 have been 20 % (NH 4 ) 2 S 2 O 8 , 90 °C and pH 6. Data from XRF and AAS during the reaction at different time are presented to analyse the kinetic behaviour of the system. The MnO 2 precipitated and solutions were characterized by XRF and XRD. The solid samples were kept at 800 °C for 1 h to produce chemical manganese dioxide (CMD) and were characterized by cyclic voltammetry for their electrochemical activity. The overall results denoted that chemical oxidation of manganese from spent batteries leaching solutions with ammonium peroxodisulfate is a suitable method for manganese recovery as MnO 2 prior zinc recovery by electrolysis, also to produce of a suitable product (CMD), in other words, it could be used in a process for recycling spent batteries.
doi:10.12776/ams.v19i3.163 fatcat:5n3z62hczbes5mhaxe5opxziym

ANNALS OF GEOPHYSICS: AD MAJORA

Fabio Florindo, Francesca Bianco, Paola De Michelis, Simona Masina, Giovanni Muscari, Francesco Caprara, Anna Grazia Chiodetti, Edoardo Del Pezzo, Stefano Gresta
2014 Annals of Geophysics  
The journal was published regularly for a quarter of a century until 1982 when it merged with the French journal Annales de Géophysique to become Annales Geophysicae under the aegis of the European Geophysical  ...  , 2012, entitled 5th European Repeat Station (MagNetE) Workshop Rome, Italy 2011 [De Michelis and Duma 2012] which contains a subset of the scientific results presented at the 2011 MagNetE symposium  ...  The journal was published regularly for a quarter of a century until 1982 when it merged with the French journal Annales de Géophysique to become Annales Geophysicae (ISSN: 0755-0685) under the aegis of  ... 
doi:10.4401/ag-6532 doaj:addeac9c9f8a4b2e8e16719aba862475 fatcat:iexdd7wgingyvpfmz36m3w5v5q

Sign-Singularity Analysis of Field-Aligned Currents in the Ionosphere

Giuseppe Consolini, Paola De Michelis, Igino Coco, Tommaso Alberti, Maria Federica Marcucci, Fabio Giannattasio, Roberta Tozzi
2021 Atmosphere  
Field-aligned currents (FACs) flowing in the auroral ionosphere are a complex system of upward and downward currents, which play a fundamental role in the magnetosphere–ionosphere coupling and in the ionospheric heating. Here, using data from the ESA-Swarm multi-satellite mission, we studied the complex structure of FACs by investigating sign-singularity scaling features for two different conditions of a high-latitude substorm activity level as monitored by the AE index. The results clearly
more » ... ed the sign-singular character of FACs supporting the complex and filamentary nature of these currents. Furthermore, we found evidence of the occurrence of a topological change of these current systems, which was accompanied by a change of the scaling features at spatial scales larger than 30 km. This change was interpreted in terms of a sort of symmetry-breaking phenomenon due to a dynamical topological transition of the FAC structure as a consequence of FACs and substorm current wedge intensification during substorms.
doi:10.3390/atmos12060708 fatcat:t3ytbgaydjacbjwh5clkqdorsi
« Previous Showing results 1 — 15 out of 2,333 results