Rafah H. Zaidan^*, Najim A. Jasim

Frontiers in Heat and Mass Transfer, Vol.23, No.5, pp. 1595-1620, 2025, DOI:10.32604/fhmt.2025.068205 - 31 October 2025

Abstract This paper presents a comprehensive experimental and numerical investigation of radiant floor heating (RFH) systems integrated with phase change material (PCM)-based thermal energy storage (TES). The study compares two underfloor pipe configurations: double serpentine and spiral. It also looks at how well a paraffin wax PCM system works with compact heat exchanger-type TES units during winter in Iraq. Key performance indicators including discharge temperature, heat transfer rate, liquid fraction evolution, and temperature uniformity were assessed through in situ experimental measurements and ANSYS fluent simulations. Results demonstrate that the spiral design provides slightly more uniform temperature distribution… More >

Guoqiang Long^*, Wenling Chen, Yanghui Ou, Shuting Yang

The International Conference on Computational & Experimental Engineering and Sciences, Vol.33, No.1, pp. 1-1, 2025, DOI:10.32604/icces.2025.010487

Abstract China's marine carbonate rocks are widely distributed, the reservoir is deeply buried, high temperature, high closure pressure, and the reservoir has strong non-homogeneity, porosity and permeability are generally low, while the natural cracks and dissolution pore (hole) is more developed. Currently, carbonate reservoir reforming technology is developing rapidly, and more and more marine carbonates can be developed. The Permian Maokou-Qixia Formation in the Sichuan Basin has good hydrocarbon source rocks of marine carbonates. The Longniusi Hechuan block of Permian Maokou-Qixia Formation develops a set of carbonate reservoirs interacting with leopard dolomite and mud crystal clastic… More >

Ye Hoon Lee¹, Yoonjung Park^2,*

International Journal of Mental Health Promotion, Vol.27, No.8, pp. 1133-1148, 2025, DOI:10.32604/ijmhp.2025.069800 - 29 August 2025

Abstract Objectives: Population aging is occurring at a rapid speed all over the world, bringing considerable public health challenges, including for the mental health of older adults. Considering that older populations are prone to depression and stress, the need for effective preventive interventions is critical. Thus, we conducted a study aimed at exploring the preventive impact of a community-based Tai Chi program over 8 weeks on depression and perceived stress in healthy older adults in South Korea. Methods: A quasi-experimental design was utilized, with 63 older adults participating (31 individuals in the Tai Chi group and… More >

Ying Zhang^1,2, Chao Dang^1,2,*, Zhiqiang Zhang^1,2

Frontiers in Heat and Mass Transfer, Vol.23, No.4, pp. 1215-1242, 2025, DOI:10.32604/fhmt.2025.067373 - 29 August 2025

Abstract In this study, the flow boiling characteristics of R1234yf in parallel microchannels were experimentally investigated. The experiments were conducted with heat flux from 0 to 550 kW/m², mass flux of 434, 727, and 1015 kg/(m² s), saturation temperatures of 293, 298, and 303 K, and inlet sub-cooling of 5, 10, and 15 K. The analysis of the experimental results provides the following conclusions: a reduced mass flux and lower subcooling correspond to a diminished degree of superheat at the boiling inception wall; conversely, an elevated saturation temperature results in a reduced amount of superheat at the… More >

Haifeng Zhu^1,*, Zhenyu Chen^1,*, Teng Lu¹, Xiaoqin Zhi²

Frontiers in Heat and Mass Transfer, Vol.23, No.4, pp. 1303-1321, 2025, DOI:10.32604/fhmt.2025.065830 - 29 August 2025

Abstract To meet the demand for miniaturized, compact, high-reliability, and long-life cryocoolers in small satellite platforms, the development of a linear Stirling cryocooler has been undertaken. Computational Fluid Dynamics (CFD) numerical simulation software was used to conduct simulation analyses, verifying the impact of porous media channel layout, eccentricity, viscous resistance coefficient of the porous media, and piston position on the designed aerostatic bearing piston employing self-supplied gas bearing technology. The calculation results indicate that both the aerostatic force and leakage increase synchronously with eccentricity, while the two designed gas lift channel layouts are capable of providing… More >

Ya-Wen Chang^1,2, Hsiu-Chuan Chen³, Shih-Chi Chung⁴, Wai-Lam Lao⁵, Ching-Pyng Kuo^2,4,6,*, Shu-Hsin Lee^2,4,6,7,*

International Journal of Mental Health Promotion, Vol.27, No.7, pp. 979-994, 2025, DOI:10.32604/ijmhp.2025.066026 - 31 July 2025

Abstract Background: Cognitive stimulation therapy (CST) is a non-pharmacological intervention designed to improve cognitive function and emotional well-being in individuals with dementia. However, limited studies have evaluated its efficacy in Chinese-speaking populations. This study aimed to assess the effects of a 12-week cognitive stimulation intervention on cognitive function and depression in older adults with mild dementia. Methods: This quasi-experimental study employed a repeated measures design with a non-randomized experimental and control group. Participants (N = 40) 65 years and older with mild dementia (clinical dementia rating (CDR) = 0.5–1) were recruited from a regional hospital and… More >

Qizhi Chen^1,2, Wensheng Cheng^1,2, Baoping Zou^1,2,*, Bowen Kong^1,2, Yansheng Deng^1,2, Xu Long^3,*

Journal of Polymer Materials, Vol.42, No.2, pp. 463-475, 2025, DOI:10.32604/jpm.2025.064257 - 14 July 2025

Abstract The rapid development of urban rail transit has posed increasing construction and operational challenges for metro tunnels, often leading to structural damage. Grouting technology using cement-based materials is widely applied to address issues such as seepage, leakage, and alignment correction in shield tunnels. This study investigates the additional stress induced by grouting in silty soil layers, using cement-based grouts with different water-to-cement ratios and polyurethane-modified cement-based materials. Results show that additional stress decreases with depth and is more influenced by horizontal distance from the grouting point. In staged grouting, the first injection phase contributes about More >

Tianshuo Liu^1,2, Xiaoyu Cui¹, Lihao Lu^2,3, Kongkuai Ying^2,*, Yang Wang^2,3, Kangjun Liu², Zilong Wang¹, Zhenhua Jiang^2,3, Shaoshuai Liu^2,3,*

Frontiers in Heat and Mass Transfer, Vol.23, No.3, pp. 739-750, 2025, DOI:10.32604/fhmt.2025.064532 - 30 June 2025

Abstract Helium sorption cooler technology is a key means to realize highly reliable low-vibration very low-temperature environments, which have important applications in fields such as quantum computing and space exploration. The laboratory designed a superfluid suppression small hole and a multi-ribbed condenser, developed a reliable-performance helium sorption cooler (HSC), and conducted experimental studies. Experimental results show that the prototype can achieve the lowest cooling temperature of 873 mK without load by filling 6 MPa helium at room temperature. The low-temperature hold time is 26 h, and the temperature fluctuation is within 0.8 mK. The cooling power More >

Su Ye¹, Luxi Guan¹, Dong Luo¹, Fengwen Zhang¹, Jianhua Lv¹, Qizong Xie², Qiao Huang², Haiming Wu², Haibo Hu^1,*, Xiangbing Pan^1,*

Congenital Heart Disease, Vol.20, No.2, pp. 181-193, 2025, DOI:10.32604/chd.2025.063297 - 30 April 2025

Abstract Objectives: This study aimed to evaluate the feasibility, safety, and efficacy of a novel transcatheter suture closure system (HaloStitch^®) for patent foramen ovale (PFO) closure in a swine model. Methods: Thirteen swine underwent experimental PFO model creation. All animals received implantation of the transcatheter suture closure system to evaluate procedural success. Comprehensive follow-up over six months included serial ultrasound imaging, histopathological analysis, and gross anatomical examination of cardiac specimens. Results: Successful HaloStitch^® device implantation was achieved in 11 of 13 swine. Gross anatomical examination confirmed secure positioning of all sutures in the atrial septum, with no redundancy or… More >

Zahraa N. Hussain^1,*, Jamal M. Ali^1,*, Hasan S. Majdi², Abbas J. Sultan¹, H. Al-Naseri³

FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.2, pp. 351-370, 2025, DOI:10.32604/fdmp.2024.056292 - 06 March 2025

Abstract The use of nanofluids as heat transfer media represents an innovative strategy to enhance heat transfer performances. This study investigates experimentally the turbulent convective heat transfer characteristics of water-based nanofluids containing TiO₂, CuO, and graphene nanoplatelet (GNP) nanoparticles as they flow through a copper tube. Both the dynamic viscosity and thermal conductivity of these nanofluids were modeled and experimentally measured across varying nanoparticle concentrations (0.01, 0.02, and 0.03 vol.%) and temperatures (25°C, 35°C, and 45°C). The findings indicate that the behavior of nanofluids depends on the parameter used for comparison with the base fluid. Notably, both More > Graphic Abstract