1,723,293 research outputs found
A new geophysical and geospatial dataset from the Quaternary basin of Norcia (central Italy)
No full textWe provide the entire dataset of the paper "Dataset of seismic ambient vibrations from the Quaternary Norcia basin (central Italy)" submitted to "Data in Brief" journal, including geophysical and geospatial data.
The dataset was used and analysed in the article:
Di Giulio, G., Ercoli, M., Vassallo, M., Porreca, M. (2020). Investigation of the Norcia basin (Central Italy) through ambient vibration measurements and geological surveys, Engineering Geology, 267, 105501, https://doi.org/10.1016/j.enggeo.2020.105501
The geophysical dataset was collected in the Norcia basin in Central Italy, area struck by a long earthquake sequence during the 2016-2017, including five main-shocks with Mw>5.0.
The Mw 6.5 mainshock occurred on 30 October 2016 close to the town of Norcia. Different degrees of damages were observed during this seismic crisis, with a variable seismic shaking controlled, among many factors, by important 1D and 2D variation of Quaternary fluvio-lacustrine sediments infilling the basin.
Following this seismic sequence, we registered seismic vibration measurements, mainly single-seismic station noise data. We aimed to determine the distribution of resonant frequency (f0) of the basin and, though a join analysis with the available geological information, to infer the subsurface basin architecture.
A total of 60 sites were measured to cover the entire extension in the basin. We deployed seismometers along three transects of a total length of 21 km, mostly along the main structural directions of the basin (i.e. NNW-SSE and NE-SW).
Two 2D arrays of seismic stations with a elicoidal-shaped geometry, and a set of MASW active data were also acquired in the northern sector of the basin, in order to better constrain the seismic velocity of the sedimentary infilling.
In comparison to the data used in the paper Di Giulio et al. (2020), seven additional records have been here recovered across the basin (i.e. N54-N60).
We also provide geospatial ancillary data, both as a complete open-source Geographical Information Systems (GIS) project and as a set of single GeoPackage (.gpkg) and Keyhole Markup Language (.kml) files.
The dataset can be used for different purposes: specific researches on the Norcia basin, comparative studies on similar areas around the world, development of new data modeling/analysis software
Post tectonic growth of late diagenetic greigite
No full textPaleomagnetic, rock magnetic and micro-textural
analyses from a Middle Pleistocene lacustrine sequence
in the southern Apennines (Italy) indicate the presence of
greigite and magnetite as the main magnetic minerals at
different stratigraphic levels. In all cases a normal polarity
characteristic remanent magnetization (ChRM) was observed,
in agreement with an 40Ar–39Ar age of 0.712 ± 0.018 Ma
from volcaniclastic sanidine. After correction for bedding tilt,
ChRM directions carried by greigite do not coincide with the
expected geocentric axial dipole field direction at the site
latitude, whereas the magnetite ChRMs directions do. The
data indicate that the greigite magnetization was acquired
after tilting and after lock-in of the magnetite ChRM.
The estimated delay for the remanence carried by greigite
with respect to deposition is 300 ka. Scanning electron
microscope analyses indicate that alteration of detrital
volcanic minerals has occurred and that authigenic greigite
is generally present in agglomerates and around volcanic
grains. This observation is consistent with a late diagenetic
origin of greigite due to anoxic conditions and availability of
dissolved sulfide associated with decomposition of organic
matter in the paleolake. Documentation of a late diagenetic
magnetization confirms that care should be taken when
using greigite-bearing sediments for magnetostratigraphic
and tectonic studies. Citation: Porreca, M., M. Mattei, and
G. DiVincenzo (2009), Post-deformational growth of late diagenetic
greigite in lacustrine sediments from southern Italy
Reloj Tabata
No full textGrado obtenido: Especialista en sistemas embebidosDisciplina: Especialización en sistemas embebidosFil: Porreca, Tomas Alberto. Universidad de Buenos Aires. Facultad de Ingeniería; Argentina
Módulo de encendido para motor de combustión interna
No full textGrado obtenido: Magister de la Universidad de Buenos Aires en Sistemas EmbebidosDisciplina: Maestría en Sistemas EmbebidosFil: Porreca, Tomas A. Universidad de Buenos Aires. Facultad de Ingeniería; Argentina
Magma flow within dykes in submarine hyaloclastite environments: An AMS study of the Miocene Cabo de Gata volcanic units
No full text© 2015 The Geological Society of London. Abstract The Miocene Cabo de Gata volcanic arc in SE Spain comprises a wide variety of volcanic facies and eruptive styles in subaqueous to subaerial environments. In the SW sector of the area, 5-100 m-thick, NNW-SSE-orientated dykes feed and intrude submarine hyaloclastite deposits. We analysed the anisotropy of magnetic susceptibility (AMS) of six dykes and five hyaloclastite sites from three volcanic units: the Cerro Cañadillas, Los Frailes, and El Barronal formations. The main magnetic minerals are primary low-Ti titanomagnetite and magnetite. The AMS ellipsoids in the dykes are generally oblate-triaxial in shape, with magnetic foliations subparallel to the dyke walls. Kinematic field evidence supports the inferred flow directions deduced from magnetic lineation and imbrication of magnetic foliation. The geometric relationships between dyke margins and AMS axes indicate that dykes at El Barronal were emplaced via prevalent subvertical upward magma flow. The inferred flow directions are reproduced well by analogue models of AMS simulating magma migration in dykes with a diapiric geometry. The other dykes were emplaced by lateral magma propagation. Conversely, hyaloclastite shows a large scatter of the AMS axes reflecting different degrees of fragmentation. We observe a gradual increase in scatter in the AMS from confined dykes to fragmented hyaloclastite.This research has been funded by projects CGL2005-03511/BTE, HI2006-0073, PRIN2009 (PRIN 2009H37M59) and PRIN_2010-11 (2010TT22SC and 2010TT22SC_003).Peer Reviewe
AMS fabric and tectonic evolution of Quaternary intramontane extensional basins in the Picentini Mountains (Southern Apennines, Italy).
No full textIn this work, we report the results of combined
geological, structural, and anisotropy of magnetic susceptibility
(AMS) studies carried out on Quaternary deposits in
the Picentini Mountains, southern Apennines (Italy). The
study concerns four small continental basins, Acerno,
Tizzano, Iumaiano, and Piano del Gaudo, related to fluvial–
lacustrine depositional environments, ranging in altitude
from 600 to 1,200 m a.s.l. and strongly incised during
recent time. Stratigraphic and structural analyses, integrated
by low- and high-field anisotropy of magnetic susceptibility
(AMS), show that the formation of these basins
has been controlled by extensional and transtensional tectonics.
Most of the AMS sites exhibit a well-defined
magnetic foliation parallel to the bedding planes. A welldefined
magnetic lineation has also been measured within
the foliation planes. In the Iumaiano, Tizzano, and Piano
del Gaudo basins, magnetic lineations cluster around
NNE–SSW trend and are parallel to the stretching directions
inferred by structural analysis of faults and fractures.
On the basis of structural, sedimentological, and high-field
AMS data, we suggest a tectonic origin for the magnetic
lineation, analogously to what has been observed in other
weakly deformed sediments from Neogene and Quaternary
extensional basins of the Mediterranean region. Our results
demonstrate that onset and the evolution of the investigated
basins have been mainly controlled since lower Pleistocene
by NW–SE normal and transtensional faults. This deformation
pattern is consistent with a prevalent NE–SW
extensional tectonic regime, still active in southern Apennines,
as revealed by seismological and geodetic data
I comportamenti di parenting nel contesto del Disturbo da Uso di Sostanze: implicazioni dei fattori psicopatologici e cognitivi per l’assessment e l’intervento
No full textSubstance Use Disorder (SUD) represents an increasing global risk factor for disability and premature death, with significant economic costs. Nearly 90% of women who struggle with SUD are in child rearing age and maternal SUD is a risk factor for parenting and child development. Besides the direct effects of substance exposure, quality of parenting in the home represents an important mediator of undesired developmental outcomes. Compared to low-risk populations, mothers with SUD show less optimal caregiving behaviors in diverse contexts, being less sensitive and responsive to children’s signals, and more hostile and interfering with their activities. These negative parenting behaviors are linked undesired developmental outcomes and a higher risk to be involved with child protective services. Therefore, quality of parenting behaviors across different domains constitute one of the main targets of investigation in the condition of SUD, to avoid unfavorable developmental outcomes in children though targeted interventions. Furthermore, a wide array of studies shows the relevance of investigating SUD-related characteristics, as co-occurring psychopathology or parental cognitive impairments, to better understand which mechanisms could further detriment quality of parenting in SUD and support/obstacle interventions.
The current thesis focuses on quality of parenting behaviors in the context of maternal SUD, considering the psychopathological and cognitive mechanisms involved, and identifying a possible intervention protocol that could consider these aspects.
The first part of the work provides a general overview of parenting, considering some of the mechanisms involved in the process of taking care in early infancy and childhood. In chapter 1 we discuss the role of parenting behaviors in shaping child development, identifying how their quality can be influenced by cognitive resources or the presence of psychopathological symptoms in the adult.
The second part of the work will focus specifically on parenting in the context of SUD, a high-risk condition for quality of care and for child development. In Chapter 2 we will present an empirical study aimed at investigating quality of parenting behaviors through cluster analysis in mothers with SUD. In chapter 3 we will discuss the results of a study aimed at examining the role of maternal alexithymia, a specific type of psychopathology, on quality of parenting behaviors in mothers with SUD. In the empirical study in Chapter 4 we will report on a longitudinal study investigating the effect of parental psychological symptoms and executive functioning on the development of parent-child relationships during a residential program for drug addiction. In chapter 5 we will present a proposal for a randomized controlled trial aimed at modifying quality of parenting behaviors in mothers with SUD considering the intervening role of cognitive and psychopathological mechanisms.
Finally, in the last section we will provide a general discussion of the topics developed through the work, highlighting some methodological challenges and some empirical and clinical implications based on the results of our empirical studies.
Globally our results confirm that SUD represents a risk condition for parenting and quality of parent-child relationships. Patterns of mother-child interactive behaviors are more likely to present difficulties within this group, but these are subjected to variability. Differences in quality of parenting behaviors are linked to the presence of co-occurring psychopathology and cognitive resources, and these two mechanisms play an important role in the ongoing of interventions. Thus, quality of parenting behaviors should represent one of the main focuses of assessment and intervention in mothers with SUD, but they should be considered also in the light of psychopathology and cognitive functioning.Substance Use Disorder (SUD) represents an increasing global risk factor for disability and premature death, with significant economic costs. Nearly 90% of women who struggle with SUD are in child rearing age and maternal SUD is a risk factor for parenting and child development. Besides the direct effects of substance exposure, quality of parenting in the home represents an important mediator of undesired developmental outcomes. Compared to low-risk populations, mothers with SUD show less optimal caregiving behaviors in diverse contexts, being less sensitive and responsive to children’s signals, and more hostile and interfering with their activities. These negative parenting behaviors are linked undesired developmental outcomes and a higher risk to be involved with child protective services. Therefore, quality of parenting behaviors across different domains constitute one of the main targets of investigation in the condition of SUD, to avoid unfavorable developmental outcomes in children though targeted interventions. Furthermore, a wide array of studies shows the relevance of investigating SUD-related characteristics, as co-occurring psychopathology or parental cognitive impairments, to better understand which mechanisms could further detriment quality of parenting in SUD and support/obstacle interventions.
The current thesis focuses on quality of parenting behaviors in the context of maternal SUD, considering the psychopathological and cognitive mechanisms involved, and identifying a possible intervention protocol that could consider these aspects.
The first part of the work provides a general overview of parenting, considering some of the mechanisms involved in the process of taking care in early infancy and childhood. In chapter 1 we discuss the role of parenting behaviors in shaping child development, identifying how their quality can be influenced by cognitive resources or the presence of psychopathological symptoms in the adult.
The second part of the work will focus specifically on parenting in the context of SUD, a high-risk condition for quality of care and for child development. In Chapter 2 we will present an empirical study aimed at investigating quality of parenting behaviors through cluster analysis in mothers with SUD. In chapter 3 we will discuss the results of a study aimed at examining the role of maternal alexithymia, a specific type of psychopathology, on quality of parenting behaviors in mothers with SUD. In the empirical study in Chapter 4 we will report on a longitudinal study investigating the effect of parental psychological symptoms and executive functioning on the development of parent-child relationships during a residential program for drug addiction. In chapter 5 we will present a proposal for a randomized controlled trial aimed at modifying quality of parenting behaviors in mothers with SUD considering the intervening role of cognitive and psychopathological mechanisms.
Finally, in the last section we will provide a general discussion of the topics developed through the work, highlighting some methodological challenges and some empirical and clinical implications based on the results of our empirical studies.
Globally our results confirm that SUD represents a risk condition for parenting and quality of parent-child relationships. Patterns of mother-child interactive behaviors are more likely to present difficulties within this group, but these are subjected to variability. Differences in quality of parenting behaviors are linked to the presence of co-occurring psychopathology and cognitive resources, and these two mechanisms play an important role in the ongoing of interventions. Thus, quality of parenting behaviors should represent one of the main focuses of assessment and intervention in mothers with SUD, but they should be considered also in the light of psychopathology and cognitive functioning
funkdigen
No full textA generator of functional digraphs up to isomorphism
Based on Antonio E. Porreca, Ekaterina Timofeeva, Polynomial-delay generation of functional digraphs up to isomorphism, arXiv:2302.13832, 2023, https://doi.org/10.48550/arXiv.2302.13832
usage: funkdigen.py [-h] [-c] [-t] size
Generate all functional digraphs up to isomorphism
positional arguments:
size number of vertices
options:
-h, --help show this help message and exit
-c, --connected, --component
only generate components (connected digraphs)
-t, --time measure time without printing the generated digraph
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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