9,144 research outputs found
An exploratory study on internet addiction, somatic symptoms and emotional and behavioral functioning in school-aged adolescents
Objective: In the last two decades there has been a significant transformation regarding the use of new technologies. Despite growing acknowledgement concerning the different activities and functions of digital technologies, there remains a lack of understanding on how technology overuse may negatively impact both physical and psychosocial well-being. Although researchers have begun to explore the meaning and implications of excessive Internet use in non-clinical populations of children and adolescents, there is still little consistent knowledge on the topic. This study aimed to extend existing knowledge on the excessive use of the Internet among school-aged adolescents, focusing on its association with recurrent somatic symptoms, depressive risk and behavioral and emotional problems. Method: Two hundred and forty adolescents (51.9% females) aged between 10 and 15, participated in this study. Data was collected using the Children’s Somatization Inventory, the Internet Addiction Test, the Children’s Depression Inventory, the Youth Self Report and the Emotion Regulation Questionnaire. Structural Equation Model analysis was used to analyse the data. Results: Approximately 21.8% of participants reported excessive Internet use based on Young’s criteria. Higher levels of Internet use were associated with somatic and depressive symptoms as well as emotional and behavioral problems. Depressive Symptoms predicted both Internet Addiction (b = 0.304, p < 0.001) and Internalizing (b = 0.542, p <0.001) and Externalizing problems (b = 0.484, p < 0.001). Internet Addiction also significantly predicted both Internalizing (b = 0.162, p = 0.02) and Externalizing problems (b = 0.183, p = 0.02). Finally, Structural Equation Modeling showed that the indirect effect of Depressive Symptoms (via Internet Addiction) on Internalizing or Externalizing problems were significant. Conclusions: Longitudinal studies are needed to confirm these findings and to identify the mechanisms linking Internet use, somatic symptoms and adaptive functioning
The absorption spectrum of the QSO PKS 2126-158 (z_em = 3.27) at high resolution
Spectra of the z_em = 3.268 quasar PKS 2126-158 have been obtained in the
range lambda lambda 4300-6620 A with a resolution R = 27000 and an average
signal-to-noise ratio s/n = 25 per resolution element. The list of the
identified absorption lines is given together with their fitted column
densities and Doppler widths. The modal value of the Doppler parameter
distribution for the Ly-alpha lines is = 25 km/s. The column density
distribution can be described by a power-law dn/dN \propto N^{-beta} with beta
= 1.5. 12 metal systems have been identified, two of which were previously
unknown. In order to make the column densities of the intervening systems
compatible with realistic assumptions about the cloud sizes and the silicon to
carbon overabundance, it is necessary to assume a jump beyond the He II edge in
the spectrum of the UV ionizing background at z = 3 a factor 10 larger than the
standard predictions for the integrated quasar contribution. An enlarged sample
of C IV absorptions (71 doublets) has been used to analyze the statistical
properties of this class of absorbers strictly related to galaxies. The column
density distribution is well described by a single power-law, with beta=1.64
and the Doppler parameter distribution shows a modal value b = 14 km/s. The two
point correlation function has been computed in the velocity space for the
individual components of C IV features. A significant signal is obtained for
scales smaller than 200-300 km/s, xi(30< Delta v < 90 km/s) = 32.71 +- 2.89. A
trend of decreasing clustering amplitude with decreasing column density is
apparent, analogously to what has been observed for Ly-alpha lines.Comment: 16 pages, LaTeX (l-aa.sty), 13 ps figures, included in text with
epsf, Fig. 1 can be retrieved at http://www.sissa.it/~dodorico/paper.html,
accepted by Astronomy and Astrophysic
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Speed and Temperature Effects in the Energy Absorption of Axially Crushed Composite Tubes
The original thesis was written in 1989/90 on a Macintosh Plus with a processor at
8 Mhz and 2.5 Mb of RAM; it was written using Micro$oft Word Version 4 for the
Macintosh and all of the figures, with the exception of the photographs, were included.
Significant changes in computer technology have occurred in the years between the
writing and the generation of this electronic copy in 2008, there have been some
problems with backward compatibility of the software used, in particular with respect
to the graphics handling capability, so there have been some significant problems with
the use of old file formats; consequently not all of the figures are as clear as they were
when the original was written.Tubes of glass reinforced thermosetting resins have been tested in axial compression
between steel platens with one end chamfered to prevent critically high loads causing
catastrophic centre failure. By testing in such a manner these tubes crush in a
progressive and controlled manner, and are capable of exhibiting high levels of energy
absorption, particularly when related to the material mass involved. Polymers are
known to display viscoelastic behaviour and polymer composites are similarly
sensitive to test speed and temperature. Energy absorption in tube crushing has been
shown to be speed and temperature sensitive and the purpose of this project has been
to understand the variability of the energy absorption and the associated mechanisms.
The main aim has been to show how the two variables interrelate.
The materials used have been produced by hot rolling of pre-preg cloth or by
resinjection into closed moulds. Reinforcement has consisted of woven glass cloth or
random glass mat; matrix materials have been epoxy and polyester resins.
Trends to higher values of specific energy absorption with increasing speed have been
observed for epoxy matrix tubes, while polyester matrix tubes have shown less certain
trends and give lower values of specific energy absorption at high speeds. All the
tubes have shown a rapid drop in specific energy absorption with increasing
temperature above normal room temperature, with changes in crush mode being very
apparent. At temperatures in excess of about 100 degrees C the tubes have failed by centre
buckling, the transition temperature from normal crushing to buckling being sensitive
to the crush speed.
The interrelation between speed and temperature effects has been examined. Three
factors that prevent simple interrelation have been identified; these are inertial effects of crush debris, residual stresses in the hoop direction of the tube and frictional heating in the crush zone. Speed sensitivity of the energy absorption has been
determined over a range of temperatures and various features of these responses
related to the responses of the material properties.
Frictional temperature rises have been modelled mathematically and the predictions
have been shown to be reasonably consistent with experimental measurements. These
temperature rises have been shown to be important in determining the speed sensitive
behaviour of the energy absorption levels, particularly for polyester resin matrix tubes
tested at high speeds
Special issue on digital audio effects
Non peer reviewe
High-Resolution Spectroscopy from 3050 to 10000 A of the HDF-S QSO J2233-606 with UVES at the ESO VLT
We report on high-resolution observations () of the Hubble
Deep Field South QSO J2233-606 obtained with the VLT UV-Visual Echelle
Spectrograph (UVES). We present spectral data for the wavelength region \AA. The ratio of the final spectrum is about 50 per
resolution element at 4000 \AA, 90 at 5000 \AA, 80 at 6000 \AA, 40 at 8000 \AA.
Redshifts, column densities and Doppler widths of the absorption features have
been determined with Voigt-profile fitting. A total of 621 lines have been
measured. In particular 270 Ly-alpha lines, 41 Ly-beta and 24 systems
containing metal lines have been identified. Together with other data in the
literature, the present spectrum confirms that the evolution of the number
density of Ly-alpha lines with \huno has an upturn at .Comment: 34 pages Latex, with 3 PostScript figures. Astronomical Journal, in
press. A few revised upper limit
New distinguished classes of spectral spaces: a survey
In the present survey paper, we present several new classes of Hochster's
spectral spaces "occurring in nature", actually in multiplicative ideal theory,
and not linked to or realized in an explicit way by prime spectra of rings. The
general setting is the space of the semistar operations (of finite type),
endowed with a Zariski-like topology, which turns out to be a natural
topological extension of the space of the overrings of an integral domain,
endowed with a topology introduced by Zariski. One of the key tool is a recent
characterization of spectral spaces, based on the ultrafilter topology, given
in a paper by C. Finocchiaro in Comm. Algebra 2014. Several applications are
also discussed
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