Università Telematica Internazionale UNINETTUNO
Recent publications
In this work we present the HEPD-01 observations of proton fluxes from space during the October 28, 2021 solar energetic particle event, which produced a ground level enhancement on Earth. The event was associated with the major, long-duration X1-class flare and the concomitant coronal mass ejection that erupted from the Active Region 12887. This is the first direct measurement from space of particles emitted during the current solar cycle, recorded by a single instrument in the energy range from ~50 MeV/n up to ~250 MeV/n. We have performed a Weibull-modeled spectral analysis of the energy spectrum in the wide energy range 300 keV - 250 MeV, obtained from combination of HEPD-01 proton measurements with the ones from ACE/ULEIS, SOHO/EPHIN and SOHO/ERNE. The good agreement between data and model, also corroborated by a comparison with other spectral shapes commonly used in these studies, suggests that particles could have possibly been accelerated out from the ambient corona through the contribution of stochastic acceleration at the CME driven shock, even if the presence of seed populations influencing spectral shape could not be excluded. Finally, a Solar Proton Release (SPR) time of 1601±13 UTC and a magnetic path-length of L =1.32±0.24 AU have been obtained, in agreement with previous results for this event. We remark that new and precise data on protons in the tens/hundreds MeV energy range - like the one provided by HEPD-01 - could shed more light on particle acceleration as well as provide a reliable parametrization of SEP spectrum for Space Weather purposes.
In this paper, we consider the (3 + 1)-dimensional fractional-stochastic quantum Zakharov–Kuznetsov equation (FSQZKE) with M-truncated derivative. To find novel trigonometric, hyperbolic, elliptic, and rational fractional solutions, two techniques are used: the Jacobi elliptic function approach and the modified F-expansion method. We also expand on a few earlier findings. The extended quantum Zakharov–Kuznetsov has practical applications in dealing with quantum electronpositron–ion magnetoplasmas, warm ions, and hot isothermal electrons in the presence of uniform magnetic fields, which makes the solutions obtained useful in analyzing a number of intriguing physical phenomena. We plot our data in MATLAB and display various 3D and 2D graphical representations to explain how the stochastic term and fractional derivative influence the exact solutions of the FSEQZKE.
A working hypothesis issues from patterns of methylation in the 5′-UTR of the DAT1 gene. We considered relationships between pairs of CpGs, of which one on the main-gene strand and another on the complementary opposite strand (COS). We elaborated on data from ADHD children: we calculated all possible combinations of probabilities (estimated by multiplying two raw values of methylation) in pairs of CpGs from either strand. We analyzed all correlations between any given pair and all other pairs. For pairs correlating with M6-M6COS, some pairs had cytosines positioning to the reciprocal right (e.g., M3-M2COS and M6-M5COS), other pairs had cytosines positioning to the reciprocal left (e.g., M2-M3COS; M5-M6COS). Significant pair-to-pair correlations emerged between main-strand and COS CpG pairs. Through graphic representations, we hypothesized that DNA folded to looping conformations: the C1GG C2GG C3GG and C5G C6G motifs would become close enough to allow cytosines 1-2-3 to interact with cytosines 5-6 (on both strands). Data further suggest a sliding, with left- and right-ward oscillations of DNA strands. While thorough empirical verification is needed, we hypothesize simultaneous methylation of main-strand and COS DNA (“methylation dynamics”) to serve as a promising biomarker.
Investigating the jounce vector in planar and space motion is the primary objective of this paper. For planar motion, the jounce vector is split into tangential‐normal and radial‐transverse components. Simple pendulum oscillation, a central force proportionate to distance, and Keplerian orbital motion are used as models for plane motion to show the geometric properties of the jounce vector. The jounce vector of a particle that is moving across three dimensions of Euclidean space is also investigated, and it is resolved in the tangential, radial, and other radial directions in the rectifying and osculating planes, respectively. The models used were an electron in a uniform magnetic field and a particle traveling along a spiral path.
Introduction: Before the COVID-19 pandemic, proximity between mothers and their newborn infants was at the core of sanitary guidelines. With the aim of stopping the virus transmission from mothers to infants and possible physical dangers due to the infection, some hospitals discouraged or even prohibited skin-to-skin contact and breastfeeding. Method: This study recruited 180 dyads in private and public hospitals in Italy with the aim of verifying whether mother-infant separation after delivery is associated with higher maternal psychopathological distress (assessed through the SCL-90-R) and poorer quality of dyadic interactions during breastfeeding (evaluated through the SVIA). Results: Our results showed that mothers separated from their infants displayed more anxiety, depression, and obsessive-compulsive symptoms and a lower quality of feeding interactions on all the subscales of the SVIA (mother's affective state; interactive conflict; food refusal behavior; dyad's affective state). Conclusion: In light of these results, our study suggests that separating mothers from their newborns is associated with increased psychopathological symptoms in mothers and poorer feeding interactions. These issues have been posited as key predictors of maladaptive outcomes in infants' later lives; therefore, health services must fully consider the short- and long-term consequences of separating mothers and infants in their policies in the event of future pandemics.
In this paper, we investigate the qualitative behavior of the fuzzy difference equation \begin{document}$ \begin{equation*} z_{n+1} = \frac{Az_{n-s}}{B+C\prod\limits_{i = 0}^{s}z_{n-i}} \end{equation*} $\end{document} where $ n\in \mathbb{N}_{0} = \; \mathbb{N} \cup \left\{ 0\right\}, \; (z_{n}) $ is a sequence of positive fuzzy numbers, $ A, B, C $ and the initial conditions $ z_{-j}, \; j = 0, 1, ..., s $ are positive fuzzy numbers and $ s $ is a positive integer. Moreover, two examples are given to verify the effectiveness of the results obtained.
The increase in population growth rates led to a high rate of production and use of plastic materials, which created a problem in the collection and management of this waste [1]. This created severe threats to the environment and the ecosystem. The main objective of this paper is to conduct an experimental assessment of a direct diesel engine fueled with waste plastic oil (WPO), eucalyptus biofuel (EB) and conventional diesel. The engine operated in the same operating condition with all fuels. The results show that WPO has a shorter ignition delay, resulting in lower in-cylinder temperature and pressure than EB and diesel fuel. The brake thermal efficiency of WPO is significant over all the range of engine loading. Carbon monoxide emissions of WOP fuel are lower than diesel fuel and higher than EB oil. Nitrogen oxide emissions of WPO are lower at low and full loads but higher at medium load. Considerable decrease in unburned hydrocarbons and particulate matter emissions with EB compared with WPO and diesel fuels. The results of this study concluded that both fuels are considered a viable solution for achieving sustainably.
The main object of this paper is to present a family of q-series identities which involve some of the theta functions of Jacobi and Ramanujan. Each of these (presumably new) q-series identities reveals interesting relationships among three of the theta-type functions which stem from the celebrated Jacobi’s triple-product identity in a remarkably simple way. The results presented in this paper are motivated essentially by a number of recent works dealing with the subject-matter which is investigated herein
In this paper, we consider the (4+1)-dimensional fractional Fokas equation (FFE) with an M-truncated derivative. The extended tanh–coth method and the Jacobi elliptic function method are utilized to attain new hyperbolic, trigonometric, elliptic, and rational fractional solutions. In addition, we generalize some previous results. The acquired solutions are beneficial in analyzing definite intriguing physical phenomena because the FFE equation is crucial for explaining various phenomena in optics, fluid mechanics and ocean engineering. To demonstrate how the M-truncated derivative affects the analytical solutions of the FFE, we simulate our figures in MATLAB and show several 2D and 3D graphs.
Located in the arid climatic zone of Algeria, the region of Ain Sefra is a victim of climatic change, which faces several geographical, ecological, economic, and even social problems. The present study investigated the relationships between various drought indices and the evolution of land use elements in Ain Sefra from 1977 to 2017 using the Modified Soil-Adjusted Vegetation Index (MSAVI). It was revealed a considerable growth of sands estimated at 286.61% of the area, moving towards the north and northeast of the study area during the last decades. The combination of drought indices and remote sensing seems to be most promising, whose results are valuable tools for guidance and decision support to local and regional authorities.
In this paper, we look at the (4 + 1)‐dimensional stochastic Fokas equation (SFE) perturbed in the Itô sense by white noise. The tanh‐coth method and mapping method are used to acquire new trigonometric, hyperbolic, elliptic, and rational stochastic solutions. Also, we extend some earlier studies. Because the SFE equation is essential for describing different phenomena in ocean engineering, fluid mechanics and optics, the solutions obtained are useful in interpreting certain fascinating physical phenomena. To demonstrate how the multiplicative white noise affects the exact solutions of the SFE, we plot our figures in MATLAB and show several 3D graphical representations. We demonstrate how the solutions of SFE are stabilized by multiplicative white noise.
This study explored how working memory resources contributed to reading comprehension using tasks that focused on maintenance of verbal information in the phonological store, the interaction between the central executive and the phonological store (WMI), and the storage of bound semantic content in the episodic buffer (immediate narrative memory). We analysed how performance in these tasks was related to text decoding (reading speed and accuracy), listening and reading comprehension. The participants were 62 monolingual and 36 bilingual children (mean age nine years, SD = 9 months) enrolled in the same Italian primary school. Bilingual children were born to immigrant parents and had a long history of exposure to Italian as a second language. The regression analyses showed that reading accuracy and listening comprehension were associated with reading comprehension for monolingual and bilingual children. Two working memory components—WMI and immediate narrative memory—exhibited indirect effects on reading comprehension through reading accuracy and listening comprehension, respectively. Such effects occurred only for monolingual children. We discuss the implications of such findings for text reading and comprehension in monolinguals and bilinguals.
In this paper, we introduce a class of new classes of degenerate unified polynomials and we show some algebraic and differential properties. This class includes the Appell-type classical polynomials and their most relevant generalizations. Most of the results are proved by using generating function methods and we illustrate our results with some examples.
The stochastic fractional-space Korteweg–de Vries equation (SFSKdVE) in the sense of the M-truncated derivative is examined in this article. In the Itô sense, the SFSKdVE is forced by multiplicative white noise. To produce new trigonometric, hyperbolic, rational, and elliptic stochastic fractional solutions, the tanh–coth and Jacobi elliptic function methods are used. The obtained solutions are useful in interpreting certain fascinating physical phenomena because the KdV equation is essential for understanding the behavior of waves in shallow water. To demonstrate how the multiplicative noise and the M-truncated derivative impact the precise solutions of the SFSKdVE, different 3D and 2D graphical representations are plotted.
Current research has confirmed that the quality of the caregiver-child relationship influences the child’s emotional and behavioral development. Play and feeding contexts, for example, are the best contexts to observe mother-child or father-child interaction. The observation of feeding interaction establishes involvement on the part of both parties and identifies relationship characteristics. The purpose of this study is to select and describe the most frequently used observational methods during feeding interactions in the first three years of a child’s life. Instruments that employ video recordings of mealtimes will be detailed to highlight the relevance that specific tools have nowadays. Finally, the SVIA (Scala di Valutazione delle Interazioni Alimentari), a technique for analyzing food interactions by observation that has also been utilized remotely, will be offered. This is intended to provide practitioners and researchers with an overview of tools while also taking into consideration the present scenario in which digital tools are increasingly being employed in health and clinical settings. Furthermore, the purpose of this paper is to review the various observational methods of the parent-child relationship to assist future practitioners and researchers in the field in making an accurate assessment of caregiver-child interaction and selecting a valid tool for the early recognition of problematic relationships and identifying the most appropriate treatment modalities.
Using network analysis, we investigated the relationships between maladaptive psychological functioning, difficulties in emotion regulation, and risk-taking in deliberative and affective behavioral decisions. Participants (103 adolescents aged between 13 and 19 years, 62% boys) took the Cold (deliberative) and Hot (affective) versions of the Columbia Card Task and completed the Youth Self-Report (YSR) and the Difficulties in Emotion Regulation Scale (DERS). In contrast to the view that risk propensity increases from preadolescence to middle adolescence and decreases at later ages, our study revealed no age-specific trend. YSR syndrome scales were significantly correlated with risk propensity, but only in the Cold version. The YSR Thought Problems scale was the most central node in the network, linking internalizing and externalizing problems with risk propensity in the Cold CCT. Lack of emotional Clarity was the only DERS consistently linked with risk-taking both in correlation and network analyses. Maladaptive psychological functioning and difficulties in emotion regulation were linked with risk propensity in affective risky decisions through deliberative processes. The statistical significance of direct and indirect effects was further examined using nonparametric mediation analyses. Our study highlights the role of cognitive factors that in each variable set might account for risk-taking in teenagers
Design and computer graphics curricula for tertiary education include 3-D modeling skills. Students have to learn to represent (complex) 3-D objects by means of parametric surfaces or polygonal meshes. Three-dimensional modeling may be a complex task and students have to be able to accrue a certain deal of experience in the field before passing the exam. The main difficulties the students have to face mainly concern the comprehension of 3-D shapes and the choice of the most appropriate modeling techniques. This paper proposes a framework to support bachelor students of the design degree in modeling 3-D objects by means of parametric surfaces. The proposed framework provides two augmented reality (AR) apps for smartphones and a web portal. The mobile AR apps allow students to deeply visualize 3-D object shapes, thus performing a set of guided exercises in order to take practice in basic modeling techniques. On the other hand, the web portal allows students to share their models with teachers and classmates to get feedback and comments. Preliminary results show the effectiveness of the proposed solution as all volunteers involved in the experimental phase achieved better results after using the tools. Moreover, the students' opinions about the proposed framework are positive.
Although mobile technologies are a fundamental part of daily life, several studies have shown increased use of electronic devices, TV, and gaming during childhood in conjunction with the COVID-19 pandemic. The virus affected almost every country, causing uncertainty about the future, social isolation, and distress. This narrative review has searched the scientific literature in the field focusing on children. A non-systematic literature review was conducted in May 2022. Various databases were employed to conduct the document research for this paper, such as “Google Scholar”, “PubMed”, “Web of Science”. Keywords for the search included “screen time”, “media”, “digital use”, “social media”, “COVID-19”, “pandemic”, “lockdown”, “children”, “effect of media on children during COVID”. It was found that both children and adolescents seem to have used technologies to confront struggles provoked by COVID-19, such as the onset or exacerbation of symptoms of anxiety, depression, and attention-deficit/hyperactivity disorder. However, moreover, other studies have suggested that increased media use can have positive effects on children depending on usage and monitoring by the parents.
In this article, we introduce and analyze a novel fractal-fractional chaotic system. We extended the memristor-based chaotic system to the fractal-fractional mathematical model using Atangana-Baleanu–Caputo and Caputo-Fabrizio types of derivatives with exponential decay type kernels. We established the uniqueness and existence of the solution through Banach's fixed theory and Schauder's fixed point. We used some new numerical methods to derive the solution of the considered model and study the dynamical behavior using these operators. The numerical simulation results presented in both cases include the two and three-dimensional phase portraits and the time-domain responses of the state variables to evaluate the efficacy of both kernels.
The literature focused on the effect of the COVID-19 pandemic on young adult university students’ mental health shows a significant increase in psychopathological symptoms and Internet Addiction (IA). The key role played by attachment and alexithymia has also been suggested, but no study has explored the possible dynamic relationship between these variables. We recruited a sample of n = 410 young adult university students online. We assessed the attachment to parents and peers (through IPPA), alexithymia (through TAS-20), peritraumatic distress symptoms due to COVID-19 (through CPDI), and IA (through IAT). The results showed that the relationship between the attachment to mothers and IA was partially mediated by alexithymia and by the serial mediation of alexithymia and peritraumatic distress, whereas the influence of the attachment to fathers on IA was fully mediated by peritraumatic distress. The direct effects of the attachment to peers on alexithymia, peritraumatic distress, and IA were all significant, as were the indirect paths via the simple mediation of both alexithymia and peritraumatic distress and the multiple serial mediation of alexithymia and peritraumatic distress. Our findings suggested that the relationship between attachment, alexithymia, and psychopathological risk is dynamic in predicting IA during the pandemic among young adult university students and that the different attachment figures exert a peculiar contribution to these processes.
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856 members
Clemente Cesarano
  • Section of Mathematics
Fabrizio A. M. Davide
  • Faculty of Engineering
Livio Conti
  • Faculty of Engineering
Luca Placidi
  • Engineering Faculty
Elpidio Romano
  • Faculty of Engineering
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