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  • Open Access

    ARTICLE

    Research on a Simulation Platform for Typical Internal Corrosion Defects in Natural Gas Pipelines Based on Big Data Analysis

    Changchao Qi1, Lingdi Fu1, Ming Wen1, Hao Qian2, Shuai Zhao1,*

    Structural Durability & Health Monitoring, Vol.19, No.4, pp. 1073-1087, 2025, DOI:10.32604/sdhm.2025.061898 - 30 June 2025

    Abstract The accuracy and reliability of non-destructive testing (NDT) approaches in detecting interior corrosion problems are critical, yet research in this field is limited. This work describes a novel way to monitor the structural integrity of steel gas pipelines that uses advanced numerical modeling techniques to anticipate fracture development and corrosion effects. The objective is to increase pipeline dependability and safety through more precise, real-time health evaluations. Compared to previous approaches, our solution provides higher accuracy in fault detection and quantification, making it ideal for pipeline integrity monitoring in real-world applications. To solve this issue, statistical… More >

  • Open Access

    ARTICLE

    Relevant Fluid Dynamics Aspects of the Internal Ballistics in a Small-Scale Hybrid Thruster

    Sergio Cassese1, Riccardo Guida2,3,*, Daniele Trincone1, Stefano Mungiguerra1, Raffaele Savino1

    FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1299-1337, 2025, DOI:10.32604/fdmp.2025.065605 - 30 June 2025

    Abstract Robust numerical tools are essential for enabling the use of hybrid rocket engines (HREs) in future space applications. In this context, Computational Fluid Dynamics (CFD) transient simulations can be employed to analyse and predict relevant fluid dynamics phenomena within the thrust chamber of small-scale HREs. This work applies such techniques to investigate two unexpected behaviours observed in a 10 N-class hydrogen peroxide-based hybrid thruster: an uneven regression rate during High-Density Polyethylene (HDPE) and Acrylonitrile Butadiene Styrene (ABS) fuel tests, and non-negligible axial consumption in the ABS test case. The present study seeks to identify their… More >

  • Open Access

    REVIEW

    A Review of Methods for “Pump as Turbine” (PAT) Performance Prediction and Optimal Design

    Xiao Sun1, Huifan Huang1, Yanjuan Zhao2,*, Lianghuai Tong3,*, Haibin Lin3, Yuliang Zhang4

    FDMP-Fluid Dynamics & Materials Processing, Vol.21, No.6, pp. 1261-1298, 2025, DOI:10.32604/fdmp.2025.064329 - 30 June 2025

    Abstract The reverse operation of existing centrifugal pumps, commonly referred to as “Pump as Turbine” (PAT), is a key approach for recovering liquid pressure energy. As a type of hydraulic machinery characterized by a simple structure and user-friendly operation, PAT holds significant promise for application in industrial waste energy recovery systems. This paper reviews recent advancements in this field, with a focus on pump type selection, performance prediction, and optimization design. First, the advantages of various prototype pumps, including centrifugal, axial-flow, mixed-flow, screw, and plunger pumps, are examined in specific application scenarios while analyzing their suitability… More >

  • Open Access

    ARTICLE

    Optimizing Computed Tomography Processing Parameters for Accurate Detection of Internal Defects in Reinforced Concrete

    Yueshun Chen1,2,*, Yupeng Zhou1, Cao Yin3

    Structural Durability & Health Monitoring, Vol.19, No.3, pp. 575-592, 2025, DOI:10.32604/sdhm.2024.057005 - 03 April 2025

    Abstract Computed tomography (CT) can inspect the internal structure of concrete with high resolution, but improving the accuracy of measurements remains a key challenge due to the reliance on complex image processing and significant manual intervention. This study aims to optimize CT scanning parameters to enhance the accuracy of measuring crack widths and rebar volumes in reinforced concrete. Nine sets of specimens, each with varying rebar diameters and concrete cover thicknesses, were scanned before and after corrosion using an Optima CT scanner, followed by three-dimensional reconstructions using Avizo software. The effects of threshold values and “Erosion” More >

  • Open Access

    ARTICLE

    Profiles of Parent-Child Attachment and Peer Attachment among Adolescents and Associations with Internalizing Problems

    Chao Qu, Xiaoshan Jia, Haidong Zhu*

    International Journal of Mental Health Promotion, Vol.27, No.3, pp. 401-420, 2025, DOI:10.32604/ijmhp.2025.061059 - 31 March 2025

    Abstract Objectives: Attachment is a profound and enduring connection to the emotion children progressively form with their parents as they mature. It significantly impacts the social and psychological development of kids and teenagers. This study aimed to explore the latent profiles and longitudinal transition patterns of parent-child and peer attachments among adolescents. Methods: A cohort of 914 participants from China completed the measures with a twelve-month interval. There were 46.8% boys and 53.2% girls in this survey. Latent profile analysis (LPA) was adopted to explore the distinct profiles reflecting different parent-child and peer attachment response patterns… More >

  • Open Access

    ARTICLE

    Associations of Physical Activity and Sedentary Behavior with Internalizing Problems among Youth with Chronic Pain

    Lingling Yu1,2, Yanxia Chen3,*, Jinming Li2, André O. Werneck4, Fabian Herold5, Alyx Taylor6, Benjamin Tari7, Liye Zou2

    International Journal of Mental Health Promotion, Vol.27, No.2, pp. 97-110, 2025, DOI:10.32604/ijmhp.2025.061237 - 03 March 2025

    Abstract Background: Taking actions to maintain a healthy lifestyle, including regular engagement in physical activity (PA) and reducing sedentary behavior (SB), may protect against the development of internalizing problems among healthy youth. However, it remains unclear whether such associations exist among youth with chronic pain who often report symptoms of depression and anxiety. To this end, we aimed to investigate the associations between independent and combined PA and/or SB patterns with indicators of internalizing problems in this vulnerable population. Methods: Data used in this cross-sectional study were retrieved from the U.S. National Survey of Children’s Health… More >

  • Open Access

    ARTICLE

    Combustion Simulation and Structure Improvement of Internal Combustion Hot Blast Stove

    Ruibin Wang, Fuyong Su*, Shuo Huang, Shengyong Ma

    Frontiers in Heat and Mass Transfer, Vol.23, No.1, pp. 325-344, 2025, DOI:10.32604/fhmt.2024.058835 - 26 February 2025

    Abstract The main function of a hot blast stove is to deliver a high-temperature and stable hot blast to the blast furnace, which has an important impact on the blast furnace ironmaking process. To improve the combustion efficiency, a simulation model of the combustion part of an internal combustion hot blast stove was established by combining turbulence, combustion, and radiation models. Based on the original model, a new type of internal combustion hot blast stove is proposed. The results indicated insufficient combustion in the original structure and higher CO concentrations in the corners of the eyes… More >

  • Open Access

    ARTICLE

    Influence of Microwave Power and Heating Time on the Drying Kinetics and Mechanical Properties of Eucalyptus gomphocephala Wood

    Mariam Habouria1, Sahbi Ouertani1,*, Noura Ben Mansour2, Soufien Azzouz1, Mohamed Taher Elaieb3

    Frontiers in Heat and Mass Transfer, Vol.23, No.1, pp. 345-360, 2025, DOI:10.32604/fhmt.2024.057387 - 26 February 2025

    Abstract The aim of this paper was to characterize through experiment the moisture and temperature kinetic behavior of Eucalyptus gomphocephala wood samples using microwave heating (MWH) in two scenarios: intermittently and continuously. The mechanical properties and surface appearance of the heated samples were also investigated. Continuous and intermittent microwave drying kinetic experiments were conducted at a frequency of 2.45 GHz using a microwave laboratory oven at 300, 500, and 1000 watts. Drying rate curves indicated three distinct phases of MWH. Increasing the microwave power with a shorter drying time led to rapid increases in internal temperature and… More >

  • Open Access

    ARTICLE

    What Is the Psychosocial Environment of Adolescents with High or Low Internalizing Behavior?

    Changmin Yoo*

    International Journal of Mental Health Promotion, Vol.27, No.1, pp. 77-88, 2025, DOI:10.32604/ijmhp.2025.058577 - 31 January 2025

    Abstract Objective: This study aimed to examine the developmental trajectories of internalizing behaviors among adolescents and to identify key personal and environmental factors associated with these developmental patterns over time. Methods: Data were collected from 2242 adolescents (49.6% girls, aged 13.9–18.9 years) in South Korea. Latent class growth analysis was used to identify distinct developmental patterns of internalizing behaviors. Multinomial logistic regression analyses were conducted to examine the associations between these developmental patterns and various factors including gender, self-esteem, abuse and neglect experiences, peer relationships, and media use. Results: The analysis revealed three latent classes of internalizing… More >

  • Open Access

    ARTICLE

    A Geometric Model Simplification Strategy for CFD Simulation of the Cockpit Internal Environment

    Meng Zhao1, Jiaao Liu2, Yudi Liu3, Zhengwei Long1,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.142, No.2, pp. 1545-1564, 2025, DOI:10.32604/cmes.2025.058773 - 27 January 2025

    Abstract Computational Fluids Dynamics (CFD) simulations are essential for optimizing the design of a cockpit’s internal environment, but the complex geometric models consume a significant amount of computational resources and time. Arbitrary simplification of geometric models may result in inaccurate calculations of physical fields. To address this issue, this study establishes a geometric model simplification strategy and successfully applies it to a cockpit. The implementation of the whole approach is divided into three steps, summarized in three methods, namely Sensitivity Analysis Method (SAM), Detail Suppression Method (DSM), and Evaluation Standards Method (ESM). Sensitivity analysis of the More >

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