Trapped vortex cell for aeronautical applications: flow analysis through PIV and Wavelet transform tools

Results of the application of a trapped vortex cell to an airfoil with the aim of improving the aerodynamic performances are presented for two complementary experiments arranged at CIRA and at Politecnico di Torino. In the CIRA experiments, PIV measurements on a simplified configuration were carried out to characterize the trapped vortical structure and its effect on the separating flow downstream of the cell. In the experimental investigation at Politecnico di Torino, static pressure distributions were measured around a complete airfoil model, to yield lift and pitching moment coefficients. Wake surveys were also carried out to measure the drag. To study the unsteady phenomena inside the cavity pressure fluctuations signals were also investigated using Kulite sensors. In both experiments, the angle of attack of the airfoil and the Reynolds number were varied. It is shown that the flow inside the cell is highly unsteady with significant shedding of flow structures downstream. This phenomenon results in a large region of separated flow, in higher drag and lower lift. By contrast, the cell flow is considerably stabilized and regularized by applying distributed suction over the cell wall. As a result, the flow downstream of the cell reattaches and lower drag and larger lift are observed

Friction drag measurements in turbulent wall flows

Results of an experimental investigation devoted to the assessment of methodologies aimed at the friction drag measurement in turbulent wall flows are presented. Two techniques for local measurements have been developed. Namely, different versions of the velocity profile method have been used for a turbulent boundary layer developing on a flat plate. The oil flow interferometer has been arranged and results related with measurements performed in a fully developed turbulent channel flow and in the turbulent boundary layer are presented. Moreover a balance based on a floating-buoyancy system finalized to the integral measurement of the friction force acting on the flat plate is presented. The results of the three techniques are compared considering as a reference a well assessed empirical law. Good level of measurement accuracy using the balance has been evidenced highlighting the capability of the balance or the characterization of micro-grooved surfaces addressed for friction drag reduction applications

Associations Between Personality Traits, Perceived Stress and Depressive Symptoms in Gynecological Cancer Patients Characterized by the Short and Long Allele Variant of the 5-HTTLPR Genotype: Preliminary Results

Objective: The study explored associations between personality traits, perceived stress and symptoms of depression in oncological patients characterized by the two variants of the serotonin transporter (5-HTTLPR) polyrnorphisms.Method: The sample was composed of 41 gynecological cancer patients who completed self-reported questionnaires including the NEO Five-Factor Inventory, the dimension of depression-dejection (D/D) of the Profile of Moods State and the Perceived Stress Scale (PSS). The polymerase chain reaction was also employed to identify genotypes in the serotonin (5HTT) polymorphism.Results: The one-way ANOVA test, across the 5-HTTLPR genotype groups, showed significant effects of the short variants on neuroticism (p=0.009) and of the long variant on agreeableness (p=0.022), as well as a tendency to a statistical significance of the 1/1 variant on consciousness (p=0.074). Bivariate correlations showed positive correlations of neuroticism with both psychopathological symptoms (D/D r=0.522; PSS r=0.586) in the combined group S, negative association of agreeableness with depression (D/D 1=-0.613) and of consciousness with depression (DID r=0.750) and perceived stress (PSS r=-0.702) in the group of the long variant of 5-HTTLPR genotype.Conclusions: Personalized medicine should consider the interaction between genotype and phenotype in reducing levels of clinical psychological distress, highlighting how psychotherapeutic processes should improve patients' quality of life

How socio-institutional contexts and cultural worldviews relate to COVID-19 acceptance rates: A representative study in Italy

Rationale Despite its importance to counter the COVID-19 pandemic, vaccination has raised hesitation in large segments of the population. This hesitation makes it important to understand the mechanisms underlying vaccine acceptance. To this end, the study adopts the Semiotic Cultural Psychology Theory, holding that social behaviors – and therefore, vaccination acceptance – depend on the cultural meanings in terms of which people interpret the social world. Objective The study aims at estimating the impact a) of the way people interpret the socio-institutional context of the pandemic and b) of the underlying cultural worldviews on vaccine acceptance. More particularly, the study tested the three following hypotheses. a) The meanings grounding the interpretation of the socio-institutional framework – that is, trust in institutions and political values – are an antecedent of vaccination acceptance. b) The impact of these meanings is moderated by the cultural worldviews (operationalized as symbolic universes). And c), the magnitude of the symbolic universes’ moderator effect depends on the uncertainty to which the respondent is exposed. The exposure to uncertainty was estimated in terms of socioeconomic status – the lower the status, the high the exposure to uncertainty. Methods An Italian representative sample (N = 3020) completed a questionnaire, measuring vaccination acceptance, the meanings attributed to the socio-institutional context – that is, political values and trust in institutions – and symbolic universes. Results The findings were consistent with the hypotheses. a) Structural equation modelling proved that vaccine acceptance was predicted by trust in institutions. b) Multigroup analysis revealed that symbolic universes moderated the correlation between trust in institutions and vaccine acceptance. And c), the moderation effect of symbolic universes proved to occur only in the segment of lower socio-economic status (i.e., the group exposed to higher uncertainty). Conclusions Vaccination acceptance is not only a medical issue; it is also dependent upon the rationalization of the socio-institutional context. Implications for the promotion of vaccination acceptance are discussed

Maternal perinatal depression and child neurocognitive development: A relationship still to be clarified

Pregnancy frequently is associated with emotional conditions such as anxiety and depression. Perinatal depression has an incidence of around 12%. Only recently researcher put the attention on the effects of pre- and postpartum psychopathology on infant neurocognitive development. Neurobiology studies indicate that perinatal maternal depression can significantly affect the structure and function of children’s prefrontal cortex and modulate the development of cognitive abilities from intrauterine life. On the topic, the scientific literature appears ambiguous, reporting mixed results. Some studies have found no significant differences in developmental outcomes between prenatal and postpartum exposure to maternal depression, others have suggested a greater burden of depression in pregnancy than in postpartum, and still others have emphasized the role of chronicity of symptoms rather than the period of onset. Few studies have examined the effects of different developmental trajectories of maternal depression on children’s neurocognitive outcomes. The assessment of maternal health has for years been limited to postpartum depression often neglecting the timing of onset, the intensity of symptoms and their chronicity. These aspects have received less attention than they deserve, especially in relation to the effects on children’s neurocognitive development. The aim of this Perspective was to highlight inconsistencies and gaps that need to be filled in the approach to the study of this problem. Given the wide heterogeneity of data in the current literature, further studies are needed to clarify these interactions. This Perspective provides an overview of current progress, future directions, and a presentation of the authors’ views on the topic

Female gender and psychological profile of outpatients attending Post-COVID-19 follow-up: some preliminary results

Background: The Post-COVID syndrome, characterized by persistence of psychological, neurologic, and physical symptoms, affects a large proportion of COVID-19 survivors. Specifically, females seem at increased risk of experiencing more psychological manifestations of Post-COVID Syndrome. Methods: A sample of 60 PCR (Polymerase Chain Reaction) confirmed COVID-19 outpatients (48.3% female; age mean= 56.1; SD= 10.8) attending an outpatient clinic dedicated to Post-COVID-19 follow-up was enrolled for this study. Each participant completed the Psychosocial Index to assess stress, well-being, psychological distress, and illness behavior, the Impact of Event Scale – Revised to evaluate post-traumatic stress symptoms and, the Hospital Anxiety and Depression Scale to assess anxiety and depression; the Connor-Davidson Resilience Scale to assess resilience; and N scale of NEO Five Factor to assess “Neuroticism”. Results: More than half of patients showed clinical or subclinical anxiety and depressive symptoms. Post-traumatic stress symptoms were found in 58.3% of sample. Resilience levels were in a medium range (71.0 ± 15.2). Statistical analysis found a predominance of depressive symptomatology (p = 0.0453), hyperarousal manifestations (p = 0.0049), perception of stress (p = 0.0001) and trait of neuroticism in women (p 0.0001). Our results show psychological distress, post-traumatic symptoms, poor psychological well-being, depression and anxiety symptoms for several weeks after infection in patients who had COVID-19. Moreover, female outpatients had a higher perception of distress, hyperarousal manifestations and depressive symptomatology than the male counterpart.                    Conclusions: As a novelty, this study gives us a deeper understanding of the psychological Post-COVID-19 profile in a clinical sample of pneumological outpatients. Moreover, it focused on gender differences identifying the female gender as a risk factor with respect to psychological illness. Our findings suggest the relevance of planning personalized interventions and assessment aimed at higher psychopathological risk groups, such as females

The decay of signs\u2019 semiotic value: A cultural psychology interpretation of the contemporary social scenario

The article provides an analysis of the affective polarization of the public sphere, namely, the increasing momentum gained by affective sensemaking in the current socio-institutional scenario (e.g. raise of populism, distrust in democracy and spreading xenophobia). To this end, the Semiotic Cultural Psychology Theory (SCPT) is outlined. The SCPT focuses on the embodied micro-mechanisms bridging the intra- and inter-psychological levels of analysis of the semiotic dynamics. The article is composed of two parts. First, the SCPT is outlined in terms of its nine underlying tenets. Then, SCPT is used to frame an interpretation of the psycho-social dynamics underpinning the current socio-political scenario. Based on the SCPT model, the spread of affective sensemaking in current societal dynamics is interpreted as being due to the capacity of affects to work as semiotic stabilizers, enabling people to face the deep uncertainty fostered by the economic and political turmoil associated with globalization