Mattresses' pressure relief performance and comfort largely affect sleep quality. Mattress filling materials have been proven to affect the interface pressure distribution and comfort, but the effect of mattress structure is unclear. In this paper, the interface pressure distribution and subjective comfort of 10 subjects were assessed in the different bedding layer structures of mattresses, after mattress support performance was tested. The results show that the mattresses with bedding material hardness gradually increasing from the top layer to the bottom layer (BMH-ITTB) structure have a softer surface layer, a better support core layer, and higher fitness. This enables the mattress to achieve a better decompression effect. The low-pressure area (PAI) increased, while the high-pressure area (PAI and PAI), maximum pressure (P), average pressure (P), and pressure index (PI) decreased. This also enables the mattress to achieve higher subjective comfort scores.
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http://dx.doi.org/10.1016/j.jtv.2023.01.005 | DOI Listing |
Sci Rep
December 2024
School of Mechanics and Engineering, Liaoning Technical University, Fuxin, Liaoning, China.
The slope of open-pit mines is typically characterized by an interaction structure involving multiple weak layers, with these structural characteristics serving as key factors in determining rock slope stability. Under the influence of random factors such as engineering activities and geological structures, the weak layers of the slope and the intact rock layers undergo relative changes. This interaction leads to a more pronounced spatial variability in the geotechnical parameters that inherently exist.
View Article and Find Full Text PDFBMC Anesthesiol
December 2024
Escola Superior de Enfermagem do Porto, CINTESIS@RISE, Rua Dr. António Bernardino de Almeida, Porto, 4200-072, Portugal.
Background: Disturbances in the thermoregulatory system can precipitate inadvertent hypothermia in patients undergoing surgeries lasting over 60 min, causing serious complications in the recovery process. Cutaneous thermal protection is relevant for the control of temperature of patients in the perioperative setting. The standard thermal protection widely utilized is an electric forced warm air blanket.
View Article and Find Full Text PDFMaterials (Basel)
December 2024
Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China.
The issue of slope stability in earthquakes has become increasingly prominent with the construction of many infrastructure projects such as highways, bridges, and tunnels. To explore the dynamic response characteristics of bedding rock slopes in an earthquake, the three-dimensional dynamic finite-difference method (TDD-FDM) in this study is used to establish simplified rock slope models, taking a bedding rock slope with alternatively distributed soft and hard rock layers in Yunnan, China as a prototype. The dynamic response mechanism of layered rock slopes containing different thicknesses, locations, and quantities of soft rock layers was studied under different excitation directions of seismic waves.
View Article and Find Full Text PDFPLoS One
December 2024
School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing, China.
Characterizing anisotropy remains challenging in rock mechanics. Particularly, the strengths and failure patterns of layered shales under shear load are significantly anisotropic mainly because of the bedding planes. Meanwhile, understanding the creation and propagation of shear fractures is critical for drilling, mining, tunnelling, exploitation of shale gas, etc.
View Article and Find Full Text PDFSci Rep
November 2024
School of Resources and Environment, Henan Polytechnic University, Jiaozuo, 454000, China.
As a typical sedimentary rock, coal seams are usually rich in bedding planes, which significantly affect the propagation process of hydraulic fracture (HF) network and reservoir permeability. In this study, the profile characteristics and the bedding roughness of the coal seam at depth of 2800 m from Daniudi Gas Field in China is investigated. The failure mechanism of shear-expansion effect under low pressure and dynamic shear under high pressure of coal beddings induced by the dissolution-corrosion effect of fracturing liquid is analyzed.
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