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We investigate the spreading of falling ambient-temperature Newtonian drops after their normal impact on a quartz plate covered with a thin layer of liquid nitrogen. As a drop expands, liquid nitrogen evaporates, generating a vapour film that maintains the drop in levitation. Consequently, the latter spreads in inverse Leidenfrost conditions. Three drop-spreading regimes are observed: (i) inertio-capillary, (ii) inertio-viscous, and (iii) inertio-viscous-capillary. In the first regime, although the drop expansion is essentially driven by a competition between inertial and capillary stresses, it is also affected by viscous effects emerging from the vapour film, which ultimately favours the development of a shear flow within the drop. Interestingly, vapour film effects become marginal in both the second and third regimes, allowing the drop to undergo biaxial extension primarily. More specifically, in the inertio-viscous scenario, the expansion is driven by the balance between inertial and biaxial extensional viscous stresses in the drop. Finally, inertia, capillarity and drop viscosity are all relevant in the third regime. These physical mechanisms are underlined through a mixed approach combining experiments with multiphase three-dimensional numerical simulations in light of spreading dynamics analyses, energy transfer and scaling laws. Our results are rationalized in a two-dimensional diagram linking the drops’ maximum expansion and spreading time with the observed spreading regimes through a single dimensionless parameter given by the square root of the capillary number (the ratio of the viscous stress to the capillary stress).
This study examines the amendatory activities of the majority and opposition parties in the Italian 18th legislature (2018–2022) in response to the COVID-19 pandemic crisis. Following the rally around the flag hypothesis, we test whether both sides exhibited similar legislative behaviour during emergencies. We exploit an original database covering amendments tabled by Italian legislators on bills converting decree-laws. Results reveal that the COVID-19 pandemic affected amendment activities without aligning majority and opposition behaviours. In other words, the opposition did not pull in the same direction of the government legislation. This can be explained by contingent factors and pre-existing party polarization.
Family-based treatment (FBT) has proven efficacy among adolescents with eating disorders (ED). However, it is not effective or suitable for all young people and their families, which makes alternative treatments important. This is the first pilot study to compare the relative effectiveness of manualised enhanced cognitive behaviour therapy (CBT-E) among a transdiagnostic eating disorder sample of adolescents for whom CBT-E was their first ED treatment (n=42), and a group who had previously started FBT which had been discontinued without full recovery (n=27). Participants (n=69) aged 13–17 with an eating disorder completed manualised CBT-E. Outcome measures included body mass index (BMI) centile, ED psychopathology and clinical impairment. Across the cohort, results showed improvements across ED psychopathology, clinical impairment and BMI centile. The effect of the intervention on ED psychopathology and clinical impairment did not vary between groups, nor did attrition rates. There was a difference between the groups on BMI centile, with those who had previously been treated with FBT showing no change in BMI centile, whereas those with no previous FBT increased BMI at post-treatment. Implications from this research suggest that CBT-E is a viable promising alternative and could be offered among those for whom FBT has not achieved full recovery.
Key learning aims
(1) Delivering CBT-E to adolescents with eating disorders who have previously engaged in FBT but have not achieved full recovery is a promising subsequent treatment option.
(2) CBT-E was similarly completed and displayed similar overall group reductions in eating disorder symptoms in those who had discontinued FBT without full recovery compared with those who had not previously engaged with FBT.
(3) Results suggest that CBT-E could be offered when FBT has not achieved full recovery, although more research is required to understand optimal timings of treatment transition in such instances.
This study aims to assess the quality of life (QoL) of earthquake survivors who experienced 2 major earthquakes in Türkiye on February 6, 2023, with different measurement tools.
Methods
The study was conducted in 2 centers with a total of 467 participants. For QoL measurement, face-to-face Euroqol EQ-5D-5L, Euroqol Visual Analog Scale (EQ-VAS), and Nottingham Health Profile (NHP) measurement tools were used.
Results
On the EQ-5D-5L scale, most of the participants stated that they struggled the most with the anxiety/Depression dimension. In NHP, the highest mean score is in the Emotional Reaction section. Females and the 55+ age group were found to have worse QoL. A linear and moderate correlation was found between the EQ-5D-5L index value and the EQ-VAS score; an inverse, weak, or moderate correlation was found between the EQ-VAS score and the sections of the NHP scores; an inverse and strong correlation was found between the Nottingham Health Profile Distress (NHP-D) score and the EQ-5D-5L index value.
Conclusions
The findings obtained with the measurement tools used in this study reveal various dimensions affecting the QoL of different cohorts. In addition, the study provides important evidence for policies to be developed to increase post-earthquake QoL.
This article explores the relationship between gender inequities in undergraduate music technology education and the widespread imbalances that permeate the professional music technology workforce. We present evidence concerning the relationship between tertiary training and industry outcomes by focusing on three music technology degree-level offerings in Aotearoa/New Zealand. In doing so, we critically examine the ways in which higher education in Aotearoa/New Zealand may be seen to perpetuate international trends concerning the underrepresentation of women in music technology fields. Firstly, the article offers an overview of extant scholarship on gender and music technology training. From here, it examines national data on music enrolments that show gender imbalances across music degrees. It then analyses three music technology degree-level offerings in Aotearoa as case studies. These reveal how gender inequities are amplified in areas relating to music technology. Datasets are then considered in relation to gender representation within the music industry in Aotearoa. The article concludes by offering reflections on key areas for interventions and avenues for further research.
The paper presents a novel control method aimed at enhancing the trajectory tracking accuracy of two-link mechanical systems, particularly nonlinear systems that incorporate uncertainties such as time-varying parameters and external disturbances. Leveraging the Udwadia–Kalaba equation, the algorithm employs the desired system trajectory as a servo constraint. First, the system’s constraints to construct its dynamic equation and apply generalized constraints from the constraint equation to an unconstrained system. Second, we design a robust approximate constraint tracking controller for manipulator control and establish its stability using Lyapunov’s law. Finally, we numerically simulate and experimentally validate the controller on a collaborative platform using model-based design methods.
The effect of geometric twist ($\delta$) of a finite wing of various semi-aspect ratios, on the flow, aerodynamic forces and strength of wing-tip vortex, is investigated. The number of vortex shedding cells increases with increase in $\delta$. In general, the vortex shedding frequency at the root and tip of the wing is approximately the same as that for an untwisted wing. However, close to the $\delta$, where the number of cells changes, the end-cell frequency of the twisted wing undergoes a departure from the value for the untwisted wing. Dislocations at the junction of neighbouring cells are of fork-type for $\delta > -2^\circ$ and of reverse fork-type for $\delta < -2^\circ$. Additional ring-like vortex structures are observed for $\delta =-4^\circ$. Despite a significant effect of the twist on the flow and spanwise variation of the local force coefficients, low to moderate twist of the wing has a relatively minor effect on the span-integrated force coefficients. Larger positive $\delta$, however, results in a significant decrease in the time-averaged force coefficients and rolling moment at the wing root, their unsteadiness and an increase in the strength of the wing-tip vortex. Twist can be utilized as a design parameter for an air vehicle operating at low Reynolds number. Positive twist results in a decrease in unsteadiness in the flow and lower rolling moment at the wing root that can enable lowering the structural weight. Negative twist, on the other hand, weakens the wing-tip vortices that assists in formation and swarm flying by causing lower disturbance to downstream air vehicles.
This methodological study aimed to adapt the DLS, introduced for individuals aged 18-60 years, to those aged 60 years and older and to determine its psychometric properties.
Methods
We collected the data between December 15, 2021 and April 18, 2022. We carried out the study with a sample of 60 years and older living in the city center of Burdur, Turkey. The sample was selected using snowball sampling, a non-probability sampling technique. We collected the data using a questionnaire booklet covering an 11-item demographic information form and the DLS. We utilized reliability and validity analyses in the data analysis. The analyses were performed on SPSS 23.0, and a P value < 0.05 was considered statistically significant.
Results
The mean age of the participants was found to be 68.29 (SD = 6.36). The 61-item measurement tool was reduced to 57 items by removing a total of 4 items from the scale. We also calculated Cronbach’s α values to be 0.936 for the mitigation/prevention subscale, 0.935 for the preparedness subscale, 0.939 for the response subscale, and 0.945 for the recovery/rehabilitation subscale.
Conclusions
As adapted in this study, the DLS-S can be validly and reliably used for individuals aged 60 years and older.
Mpox, a zoonotic disease, has emerged as a significant international public health concern due to an increase in the number of cases diagnosed in non-endemic countries. To support public health response efforts to interrupt Mpox transmission in the community, this study aims to identify epidemiological and clinical aspects of Mpox in Jakarta, Indonesia.
Methods
The study collected Mpox data from the Provincial Health Department in Jakarta, Indonesia, from October 2023 to February 2024. This included the symptom characteristics and demographics of polymerase chain reaction (PCR)-confirmed and PCR-negative Mpox cases, which were then compared using the χ2 test.
Results
Of the PCR-confirmed total of 58 Mpox cases, most were males (96.6%, 56/58). Of these, 67.2% (39/58) reported recent sexual activity within the 21 days prior to the disease onset date, with 41.4% (24/58) reporting only 1 sexual partner during that period. Among PCR-confirmed Mpox cases, common symptoms included fever (81.1%, 47/58), rash (63.8%, 37/58), and lesions (93.1%, 54/58).
Conclusions
The predominance of male Mpox cases indicates transmission within men who have sex with men (MSM) networks, while higher prevalence among individuals with HIV or syphilis is due to shared behaviors, highlighting the need for surveillance, contact tracing, and targeted public health interventions.
The relationship between clinical examination findings and objective nasal patency measures in structural nasal obstruction remains uncertain. This review aims to explore the relationship between clinical nasal examination findings and objective nasal patency measures using acoustic rhinometry, peak nasal inspiratory flow, rhinomanometry and rhinospirometry.
Methods
Qualitative systematic review using the Preferred Reporting Items for Systematic reviews and Meta-Analyses 2020 statement.
Results
A total of 17 articles were included in the systematic review. Several studies showed a positive relationship between objective nasal patency measures and clinical nasal examination findings, however evidence in the literature is limited and confined to cohort studies. Objective nasal patency measures using acoustic rhinometry, rhinomanometry and rhinospirometry assessment correlate positively in severe anterior septal deviation but its role in assessing middle/posterior and mild/moderate septal deviation in isolation remains uncertain. There is limited evidence in the literature to assess the relationship between peak nasal inspiratory flow and clinical examination findings.
Conclusion
Objective nasal patency measures has a limited role in supporting clinical examination findings in severe structural nasal obstruction.
Oxidative stress is present in chronic obstructive pulmonary disease (COPD); however, the effect of increased dietary antioxidants on reducing COPD risk remains unclear. The aim of this study was to investigate the association of the composite dietary antioxidant index (CDAI) with COPD in adults. This study conducted a cross-sectional investigation using data from the National Health and Nutrition Examination Survey (NHANES) spanning from 2015 to March 2020 to explore the association between CDAI and COPD in adults. This study included 9295 participants. Three logistic regression models (crude model, partially adjusted model and fully adjusted model) and restricted cubic spline (RCS) curves were utilised to assess the association between CDAI levels and COPD risk. Subsequently, a two-sample Mendelian randomisation (MR) was employed to analyse the causal impact of antioxidant levels within CDAI on the occurrence of COPD. CDAI levels were inversely associated with COPD after adjusting for confounders (OR = 0·97, 95 % CI 0·95, 1·00), and the association was linear (P < 0·001), and the results of the RCS showed that CDAI was linearly correlated with COPD occurrence (P < 0·001). MR analysis revealed a causal relationship between vitamin C and COPD occurrence (OR = 0·99, 95 % CI 0·98, 1·00, P < 0·05). Our study indicates that dietary sources of antioxidants may reduce the risk of COPD occurrence, and the results of the MR analysis further show that vitamin C is causally associated with a reduced risk of COPD occurrence. However, further exploration is needed to understand how antioxidants prevent COPD.
The theory and practice of what has come to be called “deliberative democracy” have been revived for the modern era with a focus on deliberative microcosms selected through random sampling or “sortition.” But might it be possible to spread some of the benefits of deliberation beyond mini-publics to the broader society? Can technology assist with scaling an organized deliberative process? In particular, would those who experience such a process become more deliberative voters? Would their considered judgments from deliberation influence their voting? We draw on a larger than usual experiment with public deliberation and a one-year follow-up in the mid-term U.S. elections to suggest answers to these questions. It has implications for whether spreading an organized deliberative process could, in theory, be used to create more deliberative elections.
Natural disasters can cause widespread death and extensive physical devastation, but also harmfully impact individual and community health following a disaster event. Nature-based recovery approach can positively influence the mental health of people and community’s post-natural disasters. In response to the Australian bushfire season of 2019-2020, Zoos Victoria, in partnership with the Arthur Rylah Institute, worked with local communities in East Gippsland to support people’s recovery through experiencing, supporting, and witnessing nature’s recovery.
Methods
This mixed-method study explored how nature improved the recovery of remote and rural communities affected by the Black Summer bushfires in East Gippsland. The research studied the individuals’ feelings about being involved in nature-based community events and their lived experiences. Data were collected from June to September 2023 through a nature-based community recovery project survey and community interviews.
Results
The findings demonstrated that engagement with natural environments promotes positive psychological, mental, and general well-being of people from bushfire-affected communities. Positive feedback from participants indicated the success of the Nature-Based Community Recovery Project in East Gippsland after the Black Summer bushfire.
Conclusions
This research provides insights for future recovery projects and ensures that sustainable nature-based recovery solutions for bushfire-impacted communities can be established.
We examine the preopening process and price discovery from the offer price to the first open price in initial public offerings. The extent of price discovery during preopening is influenced by firm characteristics and preopening attributes, such as volume of shares executed in preopening, canceled orders, order imbalance, and changes in indicative price. Institutional investors cancel 4 orders for every executed order. Each phase of preopening contributes to incremental price discovery. In “hot” IPOs, almost all price discovery processes occur during preopening, whereas in “cold” IPOs, half of the price adjustment occurs after the market opens.
Adverse pressure gradient (APG) turbulent boundary layers (TBL) require an understanding of the details of the pressure gradient, or history effect, to characterize the associated variation of spatiotemporal turbulent statistics. The streamwise-varying mean pressure gradient is reflected in the streamwise developing mean flow field and thus resolvent analysis, which captures the amplification of the Navier–Stokes equations linearized about the turbulent mean, can be used to understand linear amplification in APG TBLs. In particular, by using a biglobal approach in which the amplification is characterized by a temporal frequency and spanwise wavenumber, the streamwise and wall-normal inhomogeneities of the APG TBL can be resolved and related to the APG history. The linear response is able to identify multiscale phenomena, identifying a near-wall peak with $\lambda _{z}^+\approx 100$ for zero pressure gradient TBLs and mild to moderate APG TBLs as well as large-scale modes whose amplification increases with APG strength and Reynolds number. It is shown that the monotonic growth in the turbulent statistics with increasing APG is reflected in the linear growth in the associated resolvent amplification. Collapse in the Reynolds stresses is obtained through an augmented hybrid velocity scale, which replaces the local APG strength measure in the hybrid velocity scale presented in Romero et al. (Intl J. Heat Fluid Flow, vol. 93, 2022, 108885) with a velocity that encapsulates the pressure gradient history. While this resolvent approach is applicable to any APG TBL, it is shown from a scaling analysis of the linearized Navier–Stokes equations that the linear growth observed in the resolvent amplification with the history effect is limited to near-equilibrium APG TBLs.
Turbulent boundary layers on immersed objects can be significantly altered by the pressure gradients imposed by the flow outside the boundary layer. The interaction of turbulence and pressure gradients can lead to complex phenomena such as relaminarization, history effects and flow separation. The angular momentum integral (AMI) equation (Elnahhas & Johnson, J. Fluid Mech., vol. 940, 2022, A36) is extended and applied to high-fidelity simulation datasets of non-zero pressure gradient turbulent boundary layers. The AMI equation provides an exact mathematical equation for quantifying how turbulence, free-stream pressure gradients and other effects alter the skin friction coefficient relative to a baseline laminar boundary layer solution. The datasets explored include flat-plate boundary layers with nearly constant adverse pressure gradients, a boundary layer over the suction surface of a two-dimensional NACA 4412 airfoil and flow over a two-dimensional Gaussian bump. Application of the AMI equation to these datasets maps out the similarities and differences in how boundary layers interact with favourable and adverse pressure gradients in various scenarios. Further, the fractional contribution of the pressure gradient to skin friction attenuation in adverse-pressure-gradient boundary layers appears in the AMI equation as a new Clauser-like parameter with some advantages for understanding similarities and differences related to upstream history effects. The results highlight the applicability of the integral-based analysis to provide quantitative, interpretable assessments of complex boundary layer physics.
Dilated cardiomyopathy is an expected manifestation and common cause of death in patients with Duchenne muscular dystrophy. We present an unusually rapid progression of cardiomyopathy in a boy with Duchenne muscular dystrophy. Expanded genetic testing revealed a contiguous Xp21 deletion involving dystrophin and XK genes, responsible for Duchenne muscular dystrophy and McLeod neuroacanthocytosis syndrome, respectively, resulting in a more severe cardiac phenotype.
This paper documents that 56% of nonprofessional social media investment analysts (SMAs) are skilled and declare beliefs that generate positive abnormal returns (ABRs), while 44% produce negative ABRs. 13% of all SMAs are high-skill type and produce a 1-week 3-factor alpha of 61 bps, while the remaining 87% generate only 6 bps. The distinctive features of high-skill SMAs are primarily firm and industry specializations. Although SMAs tend to extrapolate and herd, their expectations are not systematically wrong. For higher-skilled SMAs compared to the less-skilled ones, extrapolation fades more quickly, and herding is lower, consistent with theory.
Aqueous suspensions of cornstarch abruptly increase their viscosity on raising either shear rate or stress, and display the formation of large-amplitude waves when flowing down inclined channels. The two features have been recently connected using constitutive models designed to describe discontinuous shear thickening. By including time-dependent relaxation and spatial diffusion of the frictional contact density responsible for shear thickening, an analysis of steady sheet flow and its linear stability is presented. The inclusion of such effects is motivated by the need to avoid an ill-posed mathematical problem in thin-film theory and the resulting failure to select any preferred wavelength for unstable linear waves. Relaxation, in particular, eliminates an ultraviolet catastrophe in the spectrum of unstable waves and furnishes a preferred wavelength at which growth is maximized. The nonlinear dynamics of the unstable waves is briefly explored. It is found that the linear instability saturates once disturbances reach finite amplitude, creating steadily propagating nonlinear waves. These waves take the form of a series of steep, shear-thickened steps that translate relatively slowly in comparison with the mean flow.