Search results for "Individual"
showing 10 items of 1227 documents
X-ray emission from an adolescent classical T Tauri star
2007
The close classical T Tauri binary V4046 Sgr: Complex magnetic fields & distributed mass accretion
2011
We report here the first results of a multi-wavelength campaign focussing on magnetospheric accretion processes within the close binary system V4046 Sgr, hosting two partly-convective classical T Tauri stars of masses ~0.9 Msun and age ~12 Myr. In this paper, we present time-resolved spectropolarimetric observations collected in 2009 September with ESPaDOnS at the Canada-France-Hawaii Telescope (CFHT) and covering a full span of 7d or ~2.5 orbital/rotational cycles of V4046 Sgr. Small circularly polarised Zeeman signatures are detected in the photospheric absorption lines but not in the accretion-powered emission lines of V4046 Sgr, thereby demonstrating that both system components host lar…
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…
Spectral analysis of the AMXP during its 2018 outburst
2023
The Accreting Millisecond X-ray Pulsar IGR J17591-2342 is a Low Mass X-ray Binary (LMXB) system that went in outburst on 2018 August and it was monitored by the NICER observatory and partially by other facilities. We aim to study how the spectral emission of this source evolved during the outburst by exploiting the whole X-ray data repository of simultaneous observations. The continuum emission of the combined broad-band spectra is on average well described by an absorbed Comptonization component scattering blackbody-distributed photons peaking at (0.8 +/- 0.5) keV by a moderately optically thick corona (tau = 2.3 +/- 0.5) with temperature of (34 +/- 9) keV. A blackbody component with tempe…
Modelling the evolution of periodicity in the periodical cicadas
2018
Background: Periodical cicadas (Magicicada spp.) have a life cycle that ends with the entire underground nymph population exhibiting a synchronized mass emergence to mate above ground. Previous studies have hypothesized that the periodical cicadas evolved from non-periodical cicadas by switching from a life-cycle length determined by body size to one determined by age. Questions: When can a mutation coding for fixed life-cycle length invade a resident population in which life-cycle length is variable? What determines the length of the fixed cycle? Methods: Numerical analysis of a mathematical model and simulations of an individual-based model. Results: If there is a sufficiently strong pred…
Can the students' career performance be helpful in predicting an increase in universities income?
2013
The students’ academic failure and the delay in obtaining their final degree are a significant issue for the Italian universities and their shareholders. Based on indicators proposed by the Italian Ministry of University, the Italian universities are awarded a financial incentive if they reduce the students’ attrition and failure. In this paper we analyze the students’ careers performance using: 1) aggregate data; 2) individual data. The first compares the performances of the Italian universities using the measures and the indicators proposed by the Ministry. The second analyzes the students’ careers through an indicator based on credit earned by each student in seven academic years. The pr…
A reduçao neoliberal do sujeito ao individuo: pela recuperaçao de um imaginário com capacidade de transformaçao social
2001
Acompanhando as formulações de Cornelius Castoriadis e de Anthony Elliot, este texto afirma um imaginário que, longe se ser reprodutivo e derivado de das ilusões e da alienação do sujeito, e força produtiva de imagens e formas e, como tal, produtor da realidade social. Da perspectiva crítica aberta por esa formulação e analisado o individualismo metodológico dominante nas ciências sociais que não so justifica o projeto econômico neoliberal como não deixa espaço para quaisquer considerações sobre emergências colectivas como potencia de transformação social Following Cornelius Castoriadis and Anthony Elliot's ideas, this text assures an imaginary conception that, far from being reproductive a…
Zabieg medycyny estetycznej w przypadku małoletniego dziecka bez zgody sądu rodzinnego a odpowiedzialność prawnokarna
2017
This article refers to criminal liability for performing aesthetic medicine treatment in a form of plastic surgery without patient’s consent, substitute consent (including collective) or substitute consent of Family Court. Article presents the current state of law in this respect and the correlation between applicable regulations of various branches of law and lex generalis regulations that deal with this issue, i.e. aesthetic medicine treatment.The author evaluates and describes the legal issues related with aesthetic medicine, including the patient’s consent, extended disclosure obligation as well as the ground for statutory liability for committing a prohibited act that is described and …
Wax on, wax off, or whatever works for you : on the role of pre-competition emotions in elite karateka
2015
The purpose of the current study aimed to examine the performance related experiences of elite karate athletes prior to a major international competition. The secondary aim was to explore the relationship between athlete and coach performance ratings. Athletes selected emotional and non-emotional words to describe their experiences related to performance. Results indicated that best performance was characterized by high intensities of helpful emotion and non-emotion descriptors, while worst performance was characterized by high intensities of harmful descriptors. Moreover, intensities of emotions and non-emotions during actual good performance neared intensities recalled during best perform…