Search results for "ABILITIES"
showing 10 items of 538 documents
MODELING SNR CASSIOPEIA A from the SUPERNOVA EXPLOSION to ITS CURRENT AGE: The ROLE of POST-EXPLOSION ANISOTROPIES of EJECTA
2016
The remnants of core-collapse supernovae (SNe) have complex morphologies that may reflect asymmetries and structures developed during the progenitor SN explosion. Here we investigate how the morphology of the SNR Cassiopeia A (Cas A) reflects the characteristics of the progenitor SN with the aim to derive the energies and masses of the post-explosion anisotropies responsible for the observed spatial distribution of Fe and Si/S. We model the evolution of Cas A from the immediate aftermath of the progenitor SN to the three-dimensional interaction of the remnant with the surrounding medium. The post-explosion structure of the ejecta is described by small-scale clumping of material and larger-s…
Laboratory evidence for asymmetric accretion structure upon slanted matter impact in young stars
2020
Aims. Investigating the process of matter accretion onto forming stars through scaled experiments in the laboratory is important in order to better understand star and planetary system formation and evolution. Such experiments can indeed complement observations by providing access to the processes with spatial and temporal resolution. A previous investigation revealed the existence of a two-component stream: a hot shell surrounding a cooler inner stream. The shell was formed by matter laterally ejected upon impact and refocused by the local magnetic field. That laboratory investigation was limited to normal incidence impacts. However, in young stellar objects, the complex structure of magne…
Supernova 1987A: a Template to Link Supernovae to their Remnants
2015
The emission of supernova remnants reflects the properties of both the progenitor supernovae and the surrounding environment. The complex morphology of the remnants, however, hampers the disentanglement of the two contributions. Here we aim at identifying the imprint of SN 1987A on the X-ray emission of its remnant and at constraining the structure of the environment surrounding the supernova. We performed high-resolution hydrodynamic simulations describing SN 1987A soon after the core-collapse and the following three-dimensional expansion of its remnant between days 1 and 15000 after the supernova. We demonstrated that the physical model reproducing the main observables of SN 1987A during …
Understanding Situational Disabilities and Situational Awareness in Disasters
2019
In this paper, a scenario-based approach augmented with personas typically used in universal design and interactive design domains is used to illustrate the occurrence of situational disabilities in emergency situations, and to show how environmental factors can trigger these situational disabilities. With the help of personas representing selected archetypical characteristics and roles, the scenarios are further examined to show how these situational disabilities can affect the situational awareness of different stakeholders, not only in the command and control centers, but also first responders in the field as well as affected members of the public. This approach provides a better underst…
Media use during adolescence: the recommendations of the Italian Pediatric Society
2019
Abstract Background The use of media device, such as smartphone and tablet, is currently increasing, especially among the youngest. Adolescents spend more and more time with their smartphones consulting social media, mainly Facebook, Instagram and Twitter because. Adolescents often feel the necessity to use a media device as a means to construct a social identity and express themselves. For some children, smartphone ownership starts even sooner as young as 7 yrs, according to internet safety experts. Material and methods We analyzed the evidence on media use and its consequences in adolescence. Results In literature, smartphones and tablets use may negatively influences the psychophysical d…
A teacher-led motor programme to enhance pre-literacy and motor skills in kindergarten children
2020
Structured motor tasks may affect cognitive development by creating a cognitively challenging “enriched environment’, giving opportunity for social cooperation, increasing the joy to learn through play, improving the sense of mastery and competence. The study investigated the association between motor and cognitive exercises, through a teacher-led programme, to provide kindergarten children with the skills necessary for school literacy. Using a cluster-randomized trial design with an intervention group (N = 110) and a control group (N = 64), we examined the effects of a 3-month teacher-led motor programme enriched by executive function tasks. In the intervention group, significant gains wer…
Sociālās uzņēmējdarbības loma cilvēku ar invaliditāti nodarbinātības veicināšanā Latvijā
2022
Bakalaura darba tēma ir “Sociālās uzņēmējdarbības loma cilvēku ar invaliditāti nodarbinātības veicināšanā Latvijā”. Pētījuma mērķis ir noskaidrot, kāda ir sociālās uzņēmējdarbības ietekme uz cilvēku ar invaliditāti nodarbinātību. Lai sasniegtu pētījuma mērķi, kā pētījuma metode tika izvēlēta kvalitatīvā pētījuma metode – daļēji strukturētās intervijas ar sociālajiem uzņēmējiem un cilvēkiem ar invaliditāti, kuri strādā sociālajos uzņēmumos. Kā datu analīzes metode tika izmantota tematiskā analīze. Darbs tika balstīts uz invaliditātes sociālo modeli. Bakalaura darbā tika secināts tas, ka sociālajai uzņēmējdarbībai ir pozitīva ietekme uz cilvēku ar invaliditāti nodarbinātību, jo tā nodrošina c…
WORKING CAPITAL AS AN ENTERPRISE VALUE ASSESSMENT TOOL
2019
The valuation of an entity in off-exchange transactions involves the use of different techniques. Nevertheless, none of them guarantees the most accurate result. Therefore, it is very difficult to choose one evaluation method. Both investors, corporate managers, financial professionals, portfolio managers, and securities analysts should have a basic understanding of the process of evaluating companies. To that end, professionals recommend evaluating a company’s financial reports to detect its financial position and solvency. According to the methods of financial analysis, working capital is one of the solvency ratios, which describes the value of resources that remain after the company’s cu…
On Independent Component Analysis with Stochastic Volatility Models
2017
Consider a multivariate time series where each component series is assumed to be a linear mixture of latent mutually independent stationary time series. Classical independent component analysis (ICA) tools, such as fastICA, are often used to extract latent series, but they don't utilize any information on temporal dependence. Also financial time series often have periods of low and high volatility. In such settings second order source separation methods, such as SOBI, fail. We review here some classical methods used for time series with stochastic volatility, and suggest modifications of them by proposing a family of vSOBI estimators. These estimators use different nonlinearity functions to…
The Raising Factor, That Great Unknown. A Guided Activity for Undergraduate Students
2020
In the first years of their economics degree programs, students will face many problems successfully dealing with a range of subjects with quantitative content. Specifically, in the field of statistics, difficulties to reach some basic academic achievements have been observed. Hence, a continuing challenge for statistics teachers is how to make this subject more appealing for students through the design and implementation of new teaching methodologies. The latter tend to follow two main approaches. On the one hand, it is useful for the learning process to propose practical activities that can connect theoretical concepts with real applications in the economic context. On the other hand, we …