International Journal of Engineering最新文献

{"title":"Comparative Study of Efficiency of Hydrate Inhibitors Based on Ammonium Salts and Polyvinylpyrrolidone","authors":"George V. Buslaev, A. Lavrik","doi":"10.5829/ije.2026.39.04a.08","DOIUrl":"https://doi.org/10.5829/ije.2026.39.04a.08","url":null,"abstract":"This study experimentally investigated the inhibitory effects of ammonium chloride (NH₄Cl), polyvinylpyrrolidone (PVP), NH₄Cl + PVP, ammonium thiocyanate (NH₄SCN), and ammonium carbonate ((NH₄)₂CO₃) on methane hydrate formation. Phase equilibrium curves of hydrates were constructed in the presence of different salts to evaluate their performance as thermodynamic inhibitors. Experimental results confirmed that, among kill fluids with a density of 1.05 g/cm³, ammonium chloride more effectively shifts the hydrate equilibrium point compared to ammonium thiocyanate and ammonium carbonate. The inhibitor NH₄Cl + PVP (1 wt.% PVP) was shown to have no impact on the inhibitory effect of ammonium chloride at pressures below 5.5 MPa. However, at pressures exceeding 5.5 MPa, it enhanced inhibition: for example, the hydrate decomposition temperature decreased by 1.5 °C at 32 MPa. An investigation into the kinetic properties of the NH₄Cl + PVP inhibitor revealed preliminary data indicating a longer induction time for the combined inhibitor compared to NH₄Cl alone.","PeriodicalId":14109,"journal":{"name":"International Journal of Engineering","volume":"39 4","pages":"898-905"},"PeriodicalIF":0.0,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ije.ir/article_222861_27c0b105af7d130cf49a7cb5a8a27698.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147885727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and Preliminary Evaluation of Patient Perceptions on Safety Culture in a Hospital Setting Scale.","authors":"Kathlyn Sharmaine Valdez, Paul Froilan Garma, Andrew Sumpay, Mickaela Gamboa, Ma Stefanie Reyes, Ma Carmela Gatchalian, Erwin Mendoza, Anna Alexis Forteza","doi":"10.47895/amp.vi0.7822","DOIUrl":"10.47895/amp.vi0.7822","url":null,"abstract":"<p><strong>Objectives: </strong>Majority of the existing patient safety culture tools are designed for healthcare workers. Despite the claims that this patient safety tools are patient-centered, limited attention was given to the patients' perspectives and cultural considerations in the development. Local studies are not available in extant literature that capture patient perspectives on being safe during hospitalization. The goal of the study was to develop and provide preliminary psychometric analysis on a tool that measures patients' perception of safety culture in a hospital setting.</p><p><strong>Methods: </strong>The study was a quantitative methodological study. The instrument was developed in three phases, conceptualization and item generation through literature review, clinical observation, and focus group discussion, two rounds of expert panel review, and pilot testing. The tool was tested on 122 eligible patients admitted in a tertiary hospital. Factor analysis of the items was done to determine the underlying factor under each item. Cronbach's alpha was used to test the degree of internal consistency of the scale.</p><p><strong>Results: </strong>The Patient Perceptions on Safety Culture in Hospital Setting Scale consists of 25 items. The analysis yielded four factors explaining a total of 69.23% of the variance in the data. Items were grouped in four dimensions: Hospital workforce (4 items), Hospital Environment (5 items), Heath Management and Care Delivery (7 items), and Information Exchange (9 items). Each factor registered a Cronbach's alpha of 0.81, 0.78, 0.91, 0.94, respectively. The overall Cronbach's alpha of the scale is 0.95.</p><p><strong>Conclusion: </strong>The study offers preliminary evidence on the psychometric properties of a newly developed tool that measures patient perceptions on hospital safety culture. Subsequent studies on larger samples need to be conducted to determine the reliability and validity of the tool when applied to different population and contexts as well as determining valid cut-off points in scoring and interpretation.</p>","PeriodicalId":14109,"journal":{"name":"International Journal of Engineering","volume":"8 1","pages":"101-107"},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11132285/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70463422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Study of Lateral Loading on Piled Raft Foundations on Sandy Soil","authors":"A. Chandiwala, S. Vasanwala","doi":"10.5829/ije.2023.36.01a.04","DOIUrl":"https://doi.org/10.5829/ije.2023.36.01a.04","url":null,"abstract":"","PeriodicalId":14109,"journal":{"name":"International Journal of Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70894083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fuzzy Logic Control of Maximum Power Point Tracking Controller in an Autonomous Hybrid Power Generation System by Extended Kalman Filter for Battery State of Charge Estimation","authors":"K. Sahel Hanane, L. Abderrazak, R. Adlene, A. Mohamed, K. Mohamed","doi":"10.5829/ije.2023.36.02b.02","DOIUrl":"https://doi.org/10.5829/ije.2023.36.02b.02","url":null,"abstract":"","PeriodicalId":14109,"journal":{"name":"International Journal of Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70894461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Developing a Fuzzy Measurement of Alternatives and Ranking Compromise Solution Method for Determining Essential Barriers in Iranian Car Industry","authors":"G. R. Einy-Sarkalleh, R. Tavakkoli-Moghaddam, A. Hafezalkotob, S. Najafi","doi":"10.5829/ije.2023.36.01a.11","DOIUrl":"https://doi.org/10.5829/ije.2023.36.01a.11","url":null,"abstract":"","PeriodicalId":14109,"journal":{"name":"International Journal of Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70894826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated Linear Integer Model of a Fleet Allocation and Aircraft Routing Problem with Operational Constraints","authors":"A. Shabanpour, M. Bashiri, R. Tavakkoli-Moghaddam, A. Safi Samghabadi","doi":"10.5829/ije.2023.36.04a.07","DOIUrl":"https://doi.org/10.5829/ije.2023.36.04a.07","url":null,"abstract":"","PeriodicalId":14109,"journal":{"name":"International Journal of Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70897483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of Hard Layer by Titanium Addition During Welding Process and Quenched Directly","authors":"S. Syaripuddin, S. Sopiyan, S. Aditya, S. Yudanto, F. B. Susetyo","doi":"10.5829/ije.2023.36.03c.13","DOIUrl":"https://doi.org/10.5829/ije.2023.36.03c.13","url":null,"abstract":"","PeriodicalId":14109,"journal":{"name":"International Journal of Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70897525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mixed-mode Multiphase Sinusoidal Oscillators using Differential Voltage Current Conveyor Transconductance Amplifiers and Only Grounded Passives Components","authors":"T. Phianpranthong, A. Suksawad, A. Jantakun","doi":"10.5829/ije.2023.36.05b.18","DOIUrl":"https://doi.org/10.5829/ije.2023.36.05b.18","url":null,"abstract":"This article is about mixed-mode multiphase sinusoidal oscillators that are made up of differential voltage current conveyor transconductance amplifier (DVCCTA) and use all the grounded passive components. The proposed multiphase sinusoidal oscillators provide a single DVCCTA, a single grounded resistor and a capacitor for each phase which is suitable for integrated circuit implementation","PeriodicalId":14109,"journal":{"name":"International Journal of Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70897935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Real Time Emotion Recognition with AD8232 ECG Sensor for Classwise Performance Evaluation of Machine Learning Methods","authors":"V. K. Patil, V. Pawar, S. Kulkarni, T. Mehta, N. Khare","doi":"10.5829/ije.2023.36.06c.02","DOIUrl":"https://doi.org/10.5829/ije.2023.36.06c.02","url":null,"abstract":"","PeriodicalId":14109,"journal":{"name":"International Journal of Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70898030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Robust Renewable Energy Source-oriented Strategy for Smart Charging of Plug-in Electric Vehicles Considering Diverse Uncertainty Resources","authors":"M. Ahmadigorji, M. Mehrasa","doi":"10.5829/ije.2023.36.04a.10","DOIUrl":"https://doi.org/10.5829/ije.2023.36.04a.10","url":null,"abstract":"","PeriodicalId":14109,"journal":{"name":"International Journal of Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70898186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}