170,566 research outputs found
Carone Giuseppe. — Il turismo nell'economia internazionale
No full textC A. Carone Giuseppe. — Il turismo nell'economia internazionale. In: Population, 15ᵉ année, n°3, 1960. p. 562
Carone G. — Distribuzione territoriale della popolazione della regione alpina
No full textC A. Carone G. — Distribuzione territoriale della popolazione della regione alpina. In: Population, 14ᵉ année, n°2, 1959. pp. 361-362
Assessment of the effective stiffness in R/C frames subjected to seismic loads"
No full textThe current design codes and technical recommendations often provide rough indications for the assessment of the effective stiffness in R/C frames subjected to seismic loads, which is a key factor when a linear analysis is performed. The Italian design code (NTC-08), the Eurocode 8 and ACI 318 do not take into account all the structural parameters affecting the effective stiffness, something that may not be on the safe side when second-order effects P-Δ occur, or when incorrect distributions of the internal forces are obtained.
In this paper the factors influencing the effective stiffness of R/C beams, columns and walls under seismic forces are analyzed. Five different approaches are adopted in order to evaluate the effective stiffness of R/C members, in accordance with the scientific literature and the international design codes. A parametric analysis is performed on an actual R/C building and its results are presented and discussed, as a contribute to the improvement of design practice.
The main variables considered in the analysis are: the reinforcement ratio, the ratio of the axial load, the compressive strength of the concrete, and the type of the shallow beams (ordinary or wide beams). The second-order effects are quantified and the resulting displacements related to the Damage Limit State (DLS) under seismic loads are discussed. The analytical results show that, although the effective stiffness increases with the steel ratio, the limit of 50% of the initial stiffness turns out to be an upper bound for small values of the axial-load ratio, rather than a lower bound as indicated by both the Italian Design Code and EC-8. As a result, in some cases the current Italian and European provisions tend to underestimate second-order P-Δ effects, when the DLS is investigated under seismic loading
Raccontare l’imprevedibile: i sindaci italiani su Facebook durante la pandemia da COVID-19
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L'esperienza di educatrici delle insegnati con bambini e bambine cresciuti con genitori omosessuali: uno studio qualitativo
No full textA Gaussian Process Regression-Based Approach for Residual Stress Measurement by Incremental Hole Drilling
No full textIncremental Hole Drilling is a well-established technique for measuring residual stresses; it involves relaxing residual stresses by incrementally drilling into the material and simultaneously measuring strains using strain gauge rosettes. The measured strains and residual stresses are related by an integral formulation, so an elastic inverse solution is required to calculate the stress field. Typically, strains are measured at different depths than those at which the residual stress calculation is performed. Therefore, it is common practice to fit the strain measurements at depth using polynomials or splines. However, the choice of fitting parameters can critically affect the final measurement output. This study evaluates the uncertainty associated with the deformation fitting procedure using Gaussian Process Regression, a probabilistic machine learning algorithm capable of producing uncertainties associated with the fit itself. These fit uncertainties were then propagated to the residual stresses through a Monte Carlo simulation. The developed methodology was applied to AA 7050-T7451 aluminum samples surface treated by laser shock peening
Emergency cannulation for proximal perfusion in descending thoracic aorta procedures
No full textAcute cardiac failure during descending thoracic aorta operations, although rare, may have catastrophic consequences. Under these circumstances, the use of partial veno arterial bypass is advantageous, allowing an assisted perfusion of both proximal and distal circulation districts. Traditionally, the ascending aorta or the aortic arch are the preferred sites of cannulation for proximal arterial reinfusion, but some limitations, such as extensive calcifications or extreme fragility of these segments, may hamper or at least delay this action. Herein, we describe a simple technique for rapid cannulation of proximal aorta in emergency circumstances
Attitudes and knowledge of mental health practitioners towards LGBTQ+ patients: A mixed-method systematic review
No full textLGBTQ+ patients exhibit higher rates of mental disorder relative to the general population. This is particularly concerning since deficiencies in mental health practitioners’ skills and knowledge, along with negative attitudes and behaviors, are associated with a decreased likelihood of LGBTQ+ patients seeking mental healthcare services and an increased likelihood of reporting unmet mental healthcare needs. To address these concerns, a mixed-method systematic review was conducted to evaluate mental health practitioners’ attitudes towards and knowledge of LGBTQ+ patients and the impact of these factors on service utilization. Thirty-two relevant empirical qualitative and quantitative studies were retrieved from five databases following PRISMA guidelines, for a total of N = 13,110 mental health practitioners included. The results indicated that mental health practitioners generally hold affirming attitudes towards LGBTQ+ patients. However, significant gaps in practitioners’ knowledge and skills emerged, describing feelings of inadequate skill, lack of competence, low clinical preparedness in addressing specific LGBTQ+ needs, insufficient training opportunities, and desire for further education on LGBTQ+ issues. These findings underscore the need to enhance inclusivity and cultural competence at both organizational and educational levels. Such improvements are essential to better care for LGBTQ+ patients and reduce disparities in access to mental health services
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