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2022 ◽  
Vol 924 (1) ◽  
pp. 3
Author(s):  
Ziyan Xu ◽  
Xue-Ning Bai

Abstract Planetesimal formation is a crucial yet poorly understood process in planet formation. It is widely believed that planetesimal formation is the outcome of dust clumping by the streaming instability (SI). However, recent analytical and numerical studies have shown that the SI can be damped or suppressed by external turbulence, and at least the outer regions of protoplanetary disks are likely weakly turbulent due to magneto-rotational instability (MRI). We conduct high-resolution local shearing-box simulations of hybrid particle-gas magnetohydrodynamics (MHD), incorporating ambipolar diffusion as the dominant nonideal MHD effect, applicable to outer disk regions. We first show that dust backreaction enhances dust settling toward the midplane by reducing turbulence correlation time. Under modest level of MRI turbulence, we find that dust clumping is in fact easier than the conventional SI case, in the sense that the threshold of solid abundance for clumping is lower. The key to dust clumping includes dust backreaction and the presence of local pressure maxima, which in our work is formed by the MRI zonal flows overcoming background pressure gradient. Overall, our results support planetesimal formation in the MRI-turbulent outer protoplanetary disks, especially in ring-like substructures.


2021 ◽  
pp. 1-25
Author(s):  
Rajan B. Kurade ◽  
L. Venkatakrishnan ◽  
G. Jagadeesh

Abstract Shock-induced vortex breakdown, which occurs on the delta wings at transonic speed, causes a sudden and significant change in the aerodynamic coefficients at a moderate angle-of-attack. Wind-tunnel tests show a sudden jump in the aerodynamic coefficients such as lift force, pitching moment and centre of pressure which affect the longitudinal stability and controllability of the vehicle. A pneumatic jet operated at sonic condition blown spanwise and along the vortex core over a 60° swept delta-wing-body configuration is found to be effective in postponing this phenomenon by energising the vortical structure, pushing the vortex breakdown location downstream. The study reports that a modest level of spanwise blowing enhances the lift by about 6 to 9% and lift-to-drag ratio by about 4 to 9%, depending on the free-stream transonic Mach number, and extends the usable angle-of-attack range by 2°. The blowing is found to reduce the magnitude of unsteady pressure fluctuations by 8% to 20% in the aft portion of the wing, depending upon the method of blowing. Detailed investigations carried out on the location of blowing reveal that the blowing close to the apex of the wing maximises the benefits.


Author(s):  
Jacques J. D. M. van Lankveld ◽  
Peggy M. J. Emmerink ◽  
Regina J. J. M. van den Eijnden ◽  
Tom F. M. ter Bogt ◽  
Ron J. Pat-El ◽  
...  

AbstractPsychometric characteristics were investigated of an Implicit Association Test to assess implicit endorsement of the sexual double standard (SDS-IAT) in emerging adults. The reliability of the SDS-IAT was investigated focusing on internal consistency across different phases of the test. Convergent validity of the SDS-IAT was evaluated against the Scale for the Assessment of Sexual Standards in Youth, an explicit measure of SDS, and against gender investment. Divergent validity was evaluated against the personality characteristics of extraversion, neuroticism, and social desirability proneness. Gendered patterns were examined. Attenuation-corrected alphas demonstrated acceptable internal consistency, with alphas ranging for .65–.70. A modest level of explicit SDS endorsement was found in both female and male participants. In line with their explicit SDS level, a modest level of implicit SDS endorsement was found in male participants, whereas a reverse implicit SDS was found among young women. In agreement with our theoretical expectations, we found low convergent validity in multitrait-multimethod analysis of the SDS-IAT with a measure of explicit SDS endorsement, and with general level of investment in gender ideals. Similarly, divergent validity analysis revealed absence of significant correlations with the conceptually unrelated concepts of extraversion, neuroticism, and social desirability proneness, except for extraversion in female participants. The present findings suggest that implicit SDS endorsement can be assessed using the SDS-IAT. The finding that explicit and implicit SDS approvals differ in young female participants, while they align in young male participants, warrants further research.


2021 ◽  
Vol 45 (3) ◽  
pp. 299-314
Author(s):  
Jennifer Le ◽  
Victoria Lydahl ◽  
Mark Shafer ◽  
Aimee Franklin

Will people choose behaviors that benefit all persons in the community before a severe weather event? Or, will they choose behaviors that benefit themselves only? Knowing the answer to these questions can inform public administrators about the level of anticipatory altruism in their community. With this knowledge, they can design strategic plans that leverage a willingness to coproduce community preparedness. Over four hundred people in six severe weather and tornado prone states answered survey questions inviting them to choose between severe weather preparation options that benefit the community or the individual. Overall, our findings suggest a modest level of support for community preparation options, anticipatory altruism demonstrated by a willingness to pay, and intergenerational equity in their choices. These findings are salient in a time when governments may need to cut funding and rely more and more on foundations, nonprofits, and private efforts to provide a wide range of services. Government planners and emergency managers can use our results to strategically nudge residents into making severe weather preparations as well as to estimate support for co-production efforts with citizens to prepare the community for disasters.


Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 514
Author(s):  
Matjaž Gams ◽  
Tine Kolenik

This paper presents relations between information society (IS), electronics and artificial intelligence (AI) mainly through twenty-four IS laws. The laws not only make up a novel collection, currently non-existing in the literature, but they also highlight the core boosting mechanism for the progress of what is called the information society and AI. The laws mainly describe the exponential growth in a particular field, be it the processing, storage or transmission capabilities of electronic devices. Other rules describe the relations to production prices and human interaction. Overall, the IS laws illustrate the most recent and most vibrant part of human history based on the unprecedented growth of device capabilities spurred by human innovation and ingenuity. Although there are signs of stalling, at the same time there are still many ways to prolong the fascinating progress of electronics that stimulates the field of artificial intelligence. There are constant leaps in new areas, such as the perception of real-world signals, where AI is already occasionally exceeding human capabilities and will do so even more in the future. In some areas where AI is presumed to be incapable of performing even at a modest level, such as the production of art or programming software, AI is making progress that can sometimes reflect true human skills. Maybe it is time for AI to boost the progress of electronics in return.


PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0246970 ◽  
Author(s):  
Carl A. Latkin ◽  
Lauren Dayton ◽  
Grace Yi ◽  
Brian Colon ◽  
Xiangrong Kong

Vaccine hesitancy could become a significant impediment to addressing the COVID-19 pandemic. The current study examined the prevalence of COVID-19 vaccine hesitancy and factors associated with vaccine intentions. A national panel survey by the National Opinion Research Center (NORC) was designed to be representative of the US household population. Sampled respondents were invited to complete the survey between May 14 and 18, 2020 in English or Spanish. 1,056 respondents completed the survey—942 via the web and 114 via telephone. The dependent variable was assessed by the item “If a vaccine against the coronavirus becomes available, do you plan to get vaccinated, or not?” Approximately half (53.6%) reported intending to be vaccinated, 16.7% did not intend, and 29.7% were unsure. In the adjusted stepwise multinominal logistic regression, Black and Hispanic respondents were significantly less likely to report intending to be vaccinated as were respondents who were females, younger, and those who were more politically conservative. Compared to those who reported positive vaccine intentions, respondents with negative vaccine intentions were significantly less likely to report that they engaged in the COVID-19 prevention behaviors of wearing masks (aOR = 0.53, CI = 0.37–0.76) and social distancing (aOR = 0.22, CI = 0.12–0.42). In a sub-analysis of reasons not to be vaccinated, significant race/ethnic differences were observed. This national survey indicated a modest level of COVID-19 vaccine intention. These data suggest that public health campaigns for vaccine uptake should assess in greater detail the vaccine concerns of Blacks, Hispanics, and women to tailor programs.


Pomorstvo ◽  
2020 ◽  
Vol 34 (2) ◽  
pp. 252-260
Author(s):  
Alen Jugović

Purpose – This article discusses a type of activity, level of consumption, and cruise ship tourists’ satisfaction in a destination to understand the perspectives of cruise tourism in the city. Design/Methodology – The research was conducted during 2018 by personal interviews or website questionnaires among 163 cruise tourists in the city of Rijeka, Croatia. The survey included 15 questions that were categorized into five thematic units. The data were processed by descriptive statistics. Findings – According to a slight increase in travelers’ consumption but also their overall satisfaction, the results suggest an increase in destination attractiveness. The economic results are still at a modest level. A set of measures has been proposed to improve tourism services in the destination. Originality of the research – Given those cruise companies are permanently on the lookout for attractive destinations, it is up to cities to attract cruise ships to their ports. It is necessary to assess and check the tourists’ experience of a cruise destination permanently so that the offerings of port city can be adjusted to the changing demands of passengers. Limiting factors associated with cruising point to caution in assessing the future of cruise tourism, especially in a city where this kind of business is just beginning.


2020 ◽  
Author(s):  
Charles Plante

In 2008, Nathan Laurie calculated the costs of poverty in Canada and Ontario for the first time. Since then, several researchers have used the approach he developed to calculate the costs of poverty for most of the Canadian provinces. This research has had a substantial impact on the thinking of the public and policy makers around poverty and poverty reduction in Canada. In this working paper, we distill the central tenants of Laurie’s approach and recommend several improvements that can be made to it. In effect, Laurie’s approach works with readily available data to answer the counterfactual question: what would the savings and gains be to individuals and society if we raised the standard of living of the poor to the modest level achieved by the second income quintile or higher? In several places, however, his approach results in estimates of costs that are insensitive to changes in widely recognized measures of poverty, including Canada’s new Official Poverty Line, otherwise known as the Market Basket Measure (MBM). In the latter sections of this paper, we reproduce Laurie’s original calculations and contrast these with results based on our own recommendations in the same year. Our recommendations generate comparable results.


2020 ◽  
Author(s):  
Monica Cardoso de Mira ◽  
Elsa Lamy ◽  
Rute Santos ◽  
Jane Williams ◽  
Mafalda Vaz Pinto ◽  
...  

Abstract Objective quantification of effort and distress during endurance rides through biomarkers could help manage competitions more effectively and monitor horse welfare through an evidence-based approach. This study aimed to determine if salivary cortisol (SC) and ocular temperature measured by infrared thermography (IRTOT) are related to the outcome in endurance competitions. Saliva was collected and IRTOT measured from 61 and 14 horses, respectively, competing at qualifier 40km and 80km rides at Pre-Inspection (PI) and Vet Gates (VG). The variation of the baseline SC at the PI (median±IQR=0.27ng/dl±0.36) into VG1 was abrupt (93-256% rise) and in the next VGs either decreased or rose at a very modest level. Less experienced horses in the 40km ride showed a significantly (p<0.05) higher IRTOT (median±IQR=35.7ºC±1.4) at the PI, than their counterparts in the 80Km ride (median±IQR=35. ºC ±1.5). Horses classifying in the Top5, in the 40 km ride category had significantly (p=0.05) higher SC levels (median±IQR=0.90ng/ml ±0.61) at the PI, than horses positioned from 10th position on (median±IQR = 0.16ng/ml ±0.40). A lower IRTOT in the PI was correlated with a better placement (p>0.05) and those in the Top5 (median±IQR = 33.9ºC ±0.0) had a higher variation (+10.65%) into the last VG. A 62% predictive value for elimination (80% sensibility and 82% specificity) where SC is higher than 0.23ng/ml is advanced. SC and IRTOT can be potentially used in association to characterise physical effort and emotional stress in endurance competitions, but its significance to performance has to be put in context with the competition level.


2020 ◽  
Vol 79 (Suppl 1) ◽  
pp. 865.1-865
Author(s):  
H. H. Chen ◽  
W. C. Chao ◽  
Y. H. Chen ◽  
D. Y. Chen ◽  
C. H. Lin

Background:Interstitial lung disease (ILD) is characterized by progressive inflammation and fibrosis, and accumulating evidence have shown that exposure to air pollutants was associated with the development of ILD. Autoimmune diseases are highly correlated with ILD, including connective tissue disease-associated ILD (CTD-ILD) as well as interstitial pneumonia with autoimmune features (IPAF), and the development of ILD is a crucial cause of morbidity and mortality in patients with autoimmune diseases. One recent Taiwanese study reported that exposure to air pollutants was associated with incident systemic lupus erythematosus (SLE). However, the impact of air pollutants on the development of ILD among patients with autoimmune diseases remains unknown.Objectives:The study aimed to address the impact of accumulating exposure to air pollutant above moderate level, defined by Air Quality Index (AQI) value higher than 50, on the development of ILD in patients with autoimmune diseases including SLE, rheumatoid arthritis (RA) and primary Sjögren’s syndrome (SS).Methods:We used a National Health Insurance Research Database in Taiwan to enroll patients with SLE (International Classification of Diseases (ICD)-9 code 710.0, n=13,211), RA (ICD-9 code 714.0 and 714.30–714.33, n=32,373), and primary SS (ICD-9 code, 710.0, n=15,246) between 2001 and 2013. We identified newly diagnosed ILD cases (ICD-code 515) between 2012 and 2013 and selected age, sex, disease duration and index-year matched (1:4) patients as non-ILD controls. The hourly levels of air pollutants one year prior to the index-date were obtained from 60 air quality monitoring stations across Taiwan, and the air pollutants in the present study consisted of particulate matter <2.5 μm in size (PM2.5), particulate matter <10 μm in size (PM10), nitrogen dioxide (NO2), carbon monoxide (CO), sulfur dioxide (SO2) and ozone (O3). We used a spatio-temporal model built by a deep-learning mechanism to estimate levels of air pollutants at 374 residential locations based on data of 3 air quality monitoring stations near the location (8). Notably, we used cumulative exposed hours to air pollutants higher than modest level, defined by AQI criteria, given that daily mean level of air pollutants might possibly underestimate the triggered inflammatory effect by a temporary exposure of high-level air pollutant. A conditional logistic regression was used to determine the association between exposure to air pollutant and the development of ILD, adjusting age, gender, Charlson Comorbidity Index (CCI), urbanization, family income, and medications for autoimmune diseases.Results:A total of 272 patients with newly diagnosed ILD were identified among patients with autoimmune diseases, including 39 with SLE, 135 with RA, and 98 with primary SS. We found that the duration of exposure to PM 2.5 higher than modest level was associated with the risk of ILD development in patients with SS (adjOR 1.07, 95% CI 1.01–1.13), and similar trends were also found in patients with SLE (adjOR 1.03, 95% CI 0.95–1.12) and RA (adjOR 1.03, 95% CI 0.99–1.07). Intriguingly, we observed an inverse correlation between the duration of exposure to O3 and the development of ILD in patients with SS (adjOR 0.83, 95% CI 0.70–0.99); however, the finding was not found in patients with SLE (adjOR 1.13, 95% CI 0.92–1.37) and RA (adjOR 0.98, 95% CI 0.87–1.11).Conclusion:In conclusion, we identified that longer exposure to PM2.5 higher than modest level tended to be associated with the development of ILD in patients with autoimmune diseases, mainly SS.References:[1] Araki T, Putman RK, Hatabu H, Gao W, Dupuis J, Latourelle JC, et al. Development and Progression of Interstitial Lung Abnormalities in the Framingham Heart Study. Am J Respir Crit Care Med 2016;194:1514-1522.[2] Tang KT, Tsuang BJ, Ku KC, Chen YH, Lin CH, Chen DY. Relationship between exposure to air pollutants and development of systemic autoimmune rheumatic diseases: a nationwide population-based case-control study. Ann Rheum Dis 2019;78:1288-1291.Disclosure of Interests:Hsin-Hua Chen: None declared, Wen-Cheng Chao: None declared, Yi-Hsing Chen Grant/research support from: Taiwan Ministry of Science and Technology, Taiwan Department of Health, Taichung Veterans General Hospital, National Yang-Ming University, GSK, Pfizer, BMS., Consultant of: Pfizer, Novartis, Abbvie, Johnson & Johnson, BMS, Roche, Lilly, GSK, Astra& Zeneca, Sanofi, MSD, Guigai, Astellas, Inova Diagnostics, UCB, Agnitio Science Technology, United Biopharma, Thermo Fisher, Gilead., Paid instructor for: Pfizer, Novartis, Johnson & Johnson, Roche, Lilly, Astra& Zeneca, Sanofi, Astellas, Agnitio Science Technology, United Biopharma., Speakers bureau: Pfizer, Novartis, Abbvie, Johnson & Johnson, BMS, Roche, Lilly, GSK, Astra& Zeneca, Sanofi, MSD, Guigai, Astellas, Inova Diagnostics, UCB, Agnitio Science Technology, United Biopharma, Thermo Fisher, Gilead., Der-Yuan Chen: None declared, Ching-Heng Lin: None declared


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