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Apprendere l'italiano oggi
2008
Revista de Italianística
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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
2013
Annals of Geophysics
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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
2016
Figshare
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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
2016
Figshare
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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
2016
Figshare
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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
2016
Figshare
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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
2016
Earth, Planets and Space
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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
2000
Geophysical Journal International
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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
2022
Remote Sensing
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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
doi:10.3390/rs14061428
fatcat:orhdlbjzi5e3tdpw73zxqedahe
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... 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.
Magnetic field fluctuation features at Swarm's altitude: A fractal approach
2015
Geophysical Research Letters
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Michelis, 1998]. ...
Michelis, 1998; 107 Wanliss, 2005]. ...
doi:10.1002/2015gl063603
fatcat:oeo3vvcounga7fxuwraw36eafi
Latitudinal dependence of geomagnetically induced currents during geomagnetic storms
2018
Annals of Geophysics
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. , 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"
2019
Annals of Geophysics
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MANGANESE RECOVERING FROM ALKALINE SPENT BATTERIES BY AMMONIUM PEROXODISULFATE
2013
Acta Metallurgica Slovaca
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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
doi:10.12776/ams.v19i3.163
fatcat:5n3z62hczbes5mhaxe5opxziym
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... 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.
ANNALS OF GEOPHYSICS: AD MAJORA
2014
Annals of Geophysics
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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
2021
Atmosphere
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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
doi:10.3390/atmos12060708
fatcat:t3ytbgaydjacbjwh5clkqdorsi
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... 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.
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