Junhyoung Kim^1,*, Kevin K. Byon², Jaehyun Kim³

International Journal of Mental Health Promotion, Vol.23, No.2, pp. 155-166, 2021, DOI:10.32604/IJMHP.2021.015232 - 30 April 2021

Abstract The purpose of the present study was to investigate the relationship between types of leisure activities and happiness, life satisfaction, and health perception of older Korean adults during the COVID-19 era. Using snowballing and purposive sampling methods, 123 respondents participated in the study. The results show that participation in outdoor activities and home-based activities served as a strong predictor of happiness, life satisfaction, and health perceptions among older Korean adults. These findings suggest that engaging in outdoor activities and home-based activities is likely to increase the psychological and mental health of older Korean adults during More >

Yun-Jung Choi^1,#, Mi-ra Won^2,#,*, Youn-Joo Um^3,*

International Journal of Mental Health Promotion, Vol.23, No.2, pp. 189-199, 2021, DOI:10.32604/IJMHP.2021.015095 - 30 April 2021

Abstract The mental health of workers is an important issue that affects not only individuals and their families but also workplaces and communities. Therefore, it is necessary to regularly evaluate and analyze workers’ mental health status, including levels of stress, depression, and addictive behaviors to apply these findings in creating mental health promotion programs. This study aims to provide basic data that would facilitate early intervention for workers’ mental health problems by analyzing factors such as stress, depression, and problem drinking that can affect suicidal ideation. From April 15 to October 25, 2019, a survey was… More >

Hiran Thabrew^1,*, Harshali Kumar¹, Vanessa Garcia-Hoyos², Felicity Goodyear-Smith³

International Journal of Mental Health Promotion, Vol.23, No.2, pp. 221-230, 2021, DOI:10.32604/IJMHP.2021.015033 - 30 April 2021

Abstract Objective: Young people with congenital heart disease (CHD) are at increased risk of psychosocial issues, including anxiety and depression that can affect their medical care and quality of life. This open trial investigated the acceptability, feasibility and preliminary effectiveness of YouthCHAT, a tablet-based screener, designed to identify similar issues to a face to face psychosocial assessment, with young people who have CHD. Methods: YouthCHAT was administered to 44 such young people aged 15–25 years attending a specialist outpatient clinic at a New Zealand tertiary hospital. Key outcomes were (i) acceptability and (ii) feasibility of YouthCHAT, assessed… More >

Akinboade Oludele Akinloye^1,*, Obareng Baldwin Manoko², Mmafani Serote², Trevor Taft³

International Journal of Mental Health Promotion, Vol.23, No.2, pp. 255-276, 2021, DOI:10.32604/IJMHP.2021.011111 - 30 April 2021

Abstract This study examined mental health issues affecting the group of individuals who are in the social media contact list of the researchers. This was done by administering a closed structured questionnaire, covering information from participants’ demographic characteristics, duration of time spent on ICT usage, to their perceived health effects thereof. Male respondents, largely unemployed are active ICT users, addicted to the Internet, and also suffer from unspecified ailments. Aged 31–35 and above, half of men and all women participants spend more than 5 h per day. High-intensive ICT use is associated, in general, with concurrent… More >

Hao Dou^1,2,*, Hongxia Liu^1,2, Feng Wang^1,2, Yanli Sun^1,2

FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 629-638, 2021, DOI:10.32604/fdmp.2021.015612 - 29 April 2021

Abstract Electrospinning is a versatile and popular method for the fabrication of ultrafine fibers and many parameters in electrospinning can be adjusted when ideal micro/nanofibers are required. In particular, the selection of a proper solvent condition is a fundamental and crucial step to produce electrospun ultrafine fibers. In this study, a commonly used biomaterial, polylactic acid (PLA), was dissolved in 7 different solvents and PLA micro/nanofibers were prepared by electrospinning. The morphology, porosity, mechanical property and static contact angle were characterized to determine the quality of the obtained product. The results show that different solvent conditions More >

Yanpu Chao¹, Hao Yi^2,3,*

FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 587-595, 2021, DOI:10.32604/fdmp.2021.015478 - 29 April 2021

Abstract Many liquid metals have a high boiling point, strong electrical conductivity, high thermal conductivity, and non-toxic properties, which make them ideal targets for applications in different fields such as optics, microcircuits, electronic switches, micro-electromechanical System (MEMS) devices and 3D printing manufacturing. However, owing to the generally high surface tension of these liquids, achieving uniform micro-droplets is often a challenge due to the inherent difficulties in controlling their size and shape. In this study, a gallium indium alloy (GaIn_24.5) has been used in combination with a pneumatic drop-on-demand (DOD) injection technology to carry out a series of More >

Songchen Wang, Xinmei Li^*, Cheng Chai, Gen Wang, Caibin Lu

FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 653-666, 2021, DOI:10.32604/fdmp.2021.015127 - 29 April 2021

Abstract The interaction of U-shaped rings used for power transmission hardware with a wind-sand field is simulated numerically. A standard turbulence model is used in synergy with an Eulerian-Lagrangian approach. The results show that the wind pressure on the windward side of the U-shaped ring is the highest, a negative pressure zone appears on both sides of the U-shaped ring, while a Kármán Vortex Street is created on its leeward side. There are three possible regimes of motion for the sand grains in the wind field. Sand grains with size below 0.125 mm can follow the More >

Tao Bian¹, Xin Shen², Jun Feng¹, Bing Wang^1,*

FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 615-628, 2021, DOI:10.32604/fdmp.2021.014902 - 29 April 2021

Abstract In turbomachinery, strong secondary flow can produce significant losses of total pressure near the endwall and reduce the efficiency of the considered turbomachine. In this study, splitters located at different positions with respect to the main blade have been used to reduce such losses and improve the efficiency of the outlet guide vane (OGV). Three different relative positions have been considered assuming a NACA 65-010 profile for both the main blade and the splitter. The numerical results indicate that splitters can effectively reduce the total pressure loss by suppressing the secondary flow around the main More >

Song Gao^1,*, Xin Jin¹, Qiaohong Liu²

FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 511-529, 2021, DOI:10.32604/fdmp.2021.012741 - 29 April 2021

Abstract The signals generated by electromagnetic flow sensors used for slurry fluids are often affected by noise interference produced by interaction with the slurry itself. In this study, the power spectrum characteristics of the signal are studied, and an attempt is made to determine the relationship between the characteristics of the related noise and the velocity and concentration of the slurry fluid. Dedicated experiments are conducted and the related power spectrum curve is obtained processing the signal measured by the sensor with Matlab. Numerical simulations are also carried out in the frame of an Eulerian approach More >

Baocheng Shi^*, Ruomeng Ying, Lijuan Wu, Jianpeng Pan, Xingkai Zhang, Kai Liu, Yindi Zhang

FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.3, pp. 667-682, 2021, DOI:10.32604/fdmp.2021.012693 - 29 April 2021

Abstract In oil drilling processes, sand production in the oil layer is a common issue, generally mitigated by means of sand control screens. To prevent or reduce the risk of damage of these screens and to improve the related service life, it is necessary to investigate the related erosion dynamics. In this study, a screen mesh model based on the flow field similarity theory is proposed to overcome the otherwise too complex geometric structure of this type of equipment. Such model is optimized using experimental data. The predicted results are in good agreement with the measured More >