1,721,037 research outputs found
Decay times of an N-normal-mode system
No full textWe derive a general closed-form expression for the decay times at the N-normal modes for a system of coupled oscillators, described by a set of linear differential equations. The formula is helpful to study the sensitivity of resonant gravitational-wave antenna and, more generally, in matching mechanical or electrical resonant systems. © 1993 Società Italiana di Fisica
Stability of Jupiter Trojans investigated using frequency map analysis: the MATROS project
No full textUsing the frequency map analysis (FMA) method we investigate the stability properties of Trojan-type orbits in the proximity of the L4 and L5 Lagrangian points of Jupiter. This study is part of the MATROS project. The orbits of about 2 × 104 virtual Trojans with random initial conditions have been computed numerically and for each body the diffusion rate in frequency space has been determined by spectral analysis. The diffusion portraits show where stable orbits are located in the space of proper elements for different values of inclination. For low inclined orbits we reproduce the stability region outlined by Levison, Shoemaker & Shoemaker and, due to our fast sampling capability, we find additional resonant features in the libration amplitude versus proper eccentricity space. At higher inclinations, the stability region gradually shrinks and it disappears for inclinations of about 40°. The maximal Lyapunov characteristic exponent is computed for a limited number of Trojan orbits in our sample and the predictions concerning the chaotic behaviour of each orbit are compared with those given by the FMA method. A good agreement is obtained and the value of the Lyapunov exponent may be used to tune the results of the FMA analysis. A synthetic secular theory for the proper frequencies of Jupiter Trojans is obtained by numerically fitting the outcome of th
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Anelastic; elastic properties of a synthetic monocrystal of bismuth germanate Bi4Ge3O12 at low temperatures
No full text
Residents and incident reporting: 4 years experience in an Italian academic hospital
No full textBackground
Identifying events that may cause damage to patients and quantifying their severity and frequency are key steps to implement the necessary changes for risk reduction. Medical residents are part of the clinical team that provides care to patients, and for this reason they have to be involved in educational interventions and active incident reporting (IR). The aim of this investigation is to evaluate residents’ contribution to IR inside Udine Academic Hospital.
Methods
Since 2013 a specific training program for residents was launched and repeated every year for the newcomers. Between 2013 and 2016, anonymous voluntary IR were collected from the whole Hospital; reports were classified by topic, interested unit, reporter role, severity and frequency of the event. Data regarding residents number, specialties and duty period were obtained from University records. Full-time equivalents (FTEs) were calculated to quantify workforce of the residents over the years.
Results
In the 2013-2016 time span 234/672 residents (34.8%) have been involved in training activities. During this period residents reported 92 events. The Incident Reporting/Full-time Equivalent rate (IR/FTE) was 0 IR/FTE in 2013, 0.04 in 2014, 0.17 in 2015 and 0.10 in 2016, respectively. Self-reporting (when reporter’s unit and unit of occurrence of the event match) was 9.1% (2014), 6.0% (2015), 48.4% (2016) of total reports. Through the 4 years, Intensive Care residents had a 0.32 IR/FTE rate, surgery and medical residents had 0.05 IR/FTE, diagnostic services residents 0.01 IR/FTE.
Conclusions
Our study seems to show increasing trends of IR/FTE and self-reporting among residents after their inclusion in hospital educational interventions and risk management activities, suggesting a potential safety culture improvement. A higher tendency to report seems to be observable among residents in intensive care units, possibly because of major sensitivity due to care complexity.
Key messages:
Residents involvement in educational interventions and incident reporting system allows the hospital to expand safety culture among healthcare professionals.
Collecting data of incident reports enables to assess the safety culture of the residents and their cultural improvement over the years
Clinical contribution to right diaphragmatic hernias [Contriibuto clinico alle ernie diaframmatiche di destra]
No full textVariations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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