Search results for "high [energy resolution]"
showing 10 items of 20300 documents
Spectral analysis of the dipping LMXB system XB 1916-053
2019
Context: XB 1916-053 is a low mass X-ray binary system (LMXB) hosting a neutron star (NS) and showing periodic dips. The spectrum of the persistent emission was modeled with a blackbody component having a temperature between 1.31 and 1.67 keV and with a Comptonization component with an electron temperature of 9.4 keV and a photon index $\Gamma$ between 2.5 and 2.9. The presence of absorption features associated with highly ionized elements suggested the presence of partially ionized plasma in the system. Aims: In this work we performed a study of the spectrum of XB 1916-053, which aims to shed light on the nature of the seed photons that contribute to the Comptonization component. Methods: …
Evidence of a non-conservative mass transfer in the ultra-compact X-ray source XB 1916-053
2020
The dipping source XB 1916-053 is a compact binary system with an orbital period of 50 min harboring a neutron star. Using ten new {\it Chandra} observations and one {\it Swift/XRT} observation, we are able to extend the baseline of the orbital ephemeris; this allows us to exclude some models that explain the dip arrival times. The Chandra observations provide a good plasma diagnostic of the ionized absorber and allow us to determine whether it is placed at the outer rim of the accretion disk or closer to the compact object. From the available observations we are able to obtain three new dip arrival times extending the baseline of the orbital ephemeris from 37 to 40 years. From the analysis…
Phenomenology of low-scale Seesaw Models
2016
All the observed particles are well accommodated in the Standard Model, together with the basic forces. However, there are both experimental and theoretical hints that the Standard Model can not be a complete theory and that New Physics is needed. Some of the theoretical problems are: i) The flavor-puzzle, i.e., why are there three copies of particles differing only by their mass. Most of the free parameters in the Standard Model are linked to this puzzle. They have been measured, but their values do not follow any clear pattern and their origin remains elusive. ii) The strong CP problem, that is, why the CP symmetry is conserved in the strong interactions in the Standard Model, which is no…
La progettazione del sé professionale alla fine dell’adolescenza
2020
Si è conclusa il 15 maggio 2019 la prima parte di una ricerca- intervento ispirata alla teoria del pensiero narrativo, ai principi dell’educational counseling e della didattica orientativa. Duran- te l’anno scolastico 2018-2019, 93 studenti (50 femmine e 43 maschi) del quarto anno di cinque licei di Palermo hanno partecipato a un’iniziativa sperimentale in cui scuola e università hanno collaborato con un duplice scopo: ridurre negli studenti il gap rilevato tra le conoscenze in uscita dal liceo e quelle richieste all’inizio dei corsi universitari e potenziare in loro la capacità di formulare il proprio progetto di vita professionale. È stata sperimentata l’azione congiunta di tre tipi di in…
On the mechanism of radiation synthesis of nanogels
2016
Radiation-engineered poly(N-vinyl pyrrolidone) nanogels are very interesting biocompatible nanocarriers for i.v. administration of therapeutics and contrast agents for bioimaging among other applications. Nanogels are usually produced upon irradiation of dilute aqueous polymer solutions. Under these conditions, the polymer radicals formed primarily react via intramolecular radical-radical combination forming intramolecular crosslinks. The manufacturing process is fast and effective and grants excellent control of particle size and simultaneous sterilization of the formed nanogels. Interestingly, primary amino groups and carboxyl groups, useful for (bio)conjugation, are also formed in a dose…
Taloni huojuu vielä pahasti : metaphorical expressions used by university students about themselves as learners of English and about their teachers
2003
Orientare nella scuola alla scelta formativo-professionale post-diploma con la metodologia «SeCo»
2017
È stata effettuata un’indagine pilota ispirata alla teoria di Pennebaker e ai principi della scuola rogersiana di counseling. 88 studenti del quinto anno di un liceo di Enna hanno partecipato, tra il mese di novembre 2015 e il mese di maggio 2016, a un progetto di orientamento che ha previsto la sperimentazione della metodologia educativa «SeCo» (Scrittura espressiva e Colloquio di orientamento) per la costruzione del loro progetto di vita professionale. L’applicazione di questa metodologia ha implicato lo svolgimento di due attività formative: tre sessioni di scrittura espressivo-prospettica e tre colloqui individuali di orientamento. Si è voluto verificare se la partecipazione a queste at…
Physical qualities and body composition predictors of running performance in national level women’s official soccer matches
2023
The purpose of the study was to (1) determine match running performance, anthropometry and various physical qualities of national level women soccer players and (2) identify key physical qualities and anthropometric predictors of match running profile during a competitive season. Twenty-five national level Finnish soccer players participated in the study. Players performed countermovement jump, loaded squat jumps, 30-meter sprint, maximum isokinetic knee flexor and extensor contractions, an incremental treadmill test and underwent body composition assessment in the lab. Match running performance was analyzed from 115 match observations during competitive league matches over 11 weeks after t…
Durability is improved by both low and high intensity endurance training
2023
Introduction: This is one of the first intervention studies to examine how low- (LIT) and high-intensity endurance training (HIT) affect durability, defined as ‘time of onset and magnitude of deterioration in physiological-profiling characteristics over time during prolonged exercise’.Methods: Sedentary and recreationally active men (n = 16) and women (n = 19) completed either LIT (average weekly training time 6.8 ± 0.7 h) or HIT (1.6 ± 0.2 h) cycling for 10 weeks. Durability was analyzed before and after the training period from three factors during 3-h cycling at 48% of pretraining maximal oxygen uptake (VO2max): 1) by the magnitude and 2) onset of drifts (i.e. gradual change in energy ex…
Changes in nocturnal heart rate variability and endurance performance during a high-intensity or high-volume endurance training period in recreationa…
2014
It is known that endurance training affects the modulation of the autonomic nervous system and heart rate variability (HRV). As a method HRV may be a potential tool to monitor trainability and endurance training adaptation. The purpose of this study was to examine changes in nocturnal HRV indices and endurance running performance during high intensity versus high volume endurance training. In total, 28 recreational male and female endurance runners (35 ± 8 year, VO2max 50 ± 5 ml/kg/min) were matched into two training groups after the 8 week basic training period (BTP) according to HRV, endurance performance and training adaptation during BTP. During the 8 week hard training period (HTP), th…