Journal of Radiation Research and Applied Sciences最新文献

{"title":"Enhanced estimation for distribution function using auxiliary variable: Application with radiation data","authors":"Mohammed Nasser Alshahrani ,&nbsp;Bassant Elkalzah","doi":"10.1016/j.jrras.2025.101634","DOIUrl":"10.1016/j.jrras.2025.101634","url":null,"abstract":"<div><div>In order to get the best possible results from survey sampling, auxiliary information is essential for estimating population parameters like mean, variance, distribution function, and so on. In this article we develop an improved estimator for estimation of population distribution function (DF). The newly developed estimator leverage auxiliary information under simple random sampling method. The proposed estimators have been thoroughly evaluated using metrics such as percentage relative efficiency and mean square error, which show that they are useful in the estimating process. Empirical validation is accomplished using radiation datasets. We compared our developed estimator with ratio, product, traditional regression estimators, and other well-known estimators that have been investigated in the existing literature. Based on the numerical results, it is demonstrated that our proposed estimator perform better in terms of minimum mea squared error and higher PREs. The findings have important implications for both the evolution of survey sampling techniques and mathematical modeling classified radiation data sets.</div></div>","PeriodicalId":16920,"journal":{"name":"Journal of Radiation Research and Applied Sciences","volume":"18 3","pages":"Article 101634"},"PeriodicalIF":1.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application value of single-shot excitation fast scanning sequence in the diagnosis of mediastinal and pulmonary hilum masses: A retrospective study","authors":"Jincai Wang ,&nbsp;Hongxian Cui ,&nbsp;Jun Duan ,&nbsp;Ling Guo ,&nbsp;Xiuzhong Wang ,&nbsp;Ning Liu ,&nbsp;Wenwen Pang","doi":"10.1016/j.jrras.2025.101621","DOIUrl":"10.1016/j.jrras.2025.101621","url":null,"abstract":"<div><h3>Purpose</h3><div>To investigate the application value of the single-shot excitation fast scanning (HASTE) sequence in the diagnosis of mediastinal and pulmonary hilum masses using MRI.</div></div><div><h3>Methods</h3><div>This study was a retrospective analysis. Clinical data of 95 patients who underwent MR examination of the mediastinum and pulmonary hilum in our hospital and our hospital's national regional medical center from October 2021 to June 2024 were collected. All patients underwent multi-slice spiral CT enhanced scanning before MR examination, and the sequence used was the HASTE sequence. The imaging characteristics of MR diagnosis of mediastinal and pulmonary hilum masses were analyzed. Using pathological results as the gold standard, the diagnostic performance of multi-slice spiral CT enhanced scanning, MR HASTE sequence, and combined multi-slice spiral CT enhanced scanning with MR HASTE sequence were analyzed and compared.</div></div><div><h3>Results</h3><div>Ninety-five patients were punctured to obtain 95 masses, with a puncture success rate of 100.0 %. Pathological results showed that among the 95 patients, there were 65 cases of malignant lesions and 30 cases of benign lesions. Using pathological results as the gold standard, the sensitivity of MR + MSCT enhanced examination in diagnosing the benign and malignant nature of pulmonary hilum or mediastinal tumors was 87.69 % (57/65), specificity was 86.67 % (26/30), positive predictive value was 93.44 % (57/61), negative predictive value was 76.47 % (26/34), and accuracy was 87.37 % (83/95). The consistency K value with pathological results was 0.718, indicating good consistency between MR + MSCT enhanced examination and pathological diagnosis. The sensitivity of MSCT enhanced scanning in diagnosing the benign and malignant nature of pulmonary hilum or mediastinal tumors was 73.85 % (48/65), specificity was 70.00 % (21/30), positive predictive value was 84.21 % (48/57), negative predictive value was 55.26 % (21/38), and accuracy was 72.63 % (69/95). The consistency K value with pathological results was 0.409, indicating moderate consistency between MSCT enhanced scanning and pathological diagnosis. ROC curve analysis results showed that the area under the curve (AUC) of MR combined with multi-slice spiral CT enhanced scanning and MSCT enhanced diagnosis of pulmonary hilum or mediastinal masses were 0.895 (95 % CI: 0.8400.950) and 0.817 (95 % CI: 0.7470.886), respectively. The sensitivity and specificity of MR combined with multi-slice spiral CT enhanced scanning in diagnosing pulmonary hilum or mediastinal masses were the highest (P &lt; 0.001).</div></div><div><h3>Conclusion</h3><div>MR HASTE sequence combined with multi-slice spiral CT enhanced scanning has good application value in distinguishing the benign and malignant nature of pulmonary hilum or mediastinal masses, and has better consistency with pathological results.</div></div>","PeriodicalId":16920,"journal":{"name":"Journal of Radiation Research and Applied Sciences","volume":"18 3","pages":"Article 101621"},"PeriodicalIF":1.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Value of ultrasound ultramicro-flow imaging in detecting fingertip microflow for the evaluation of microcirculation in sepsis patients","authors":"Qing Li ,&nbsp;Jinzhuo Yue ,&nbsp;Jie Zhao ,&nbsp;Dong Chen ,&nbsp;Yongxia Wu ,&nbsp;Jinbai Huang","doi":"10.1016/j.jrras.2025.101597","DOIUrl":"10.1016/j.jrras.2025.101597","url":null,"abstract":"<div><h3>Objective</h3><div>To investigate the utility of ultrasound ultramicro-flow imaging in detecting fingertip microcirculation in patients with sepsis and septic shock.</div></div><div><h3>Methods</h3><div>From November 2022 to December 2023, 41 patients with sepsis, 21 with septic shock, and 62 with severe illness but without sepsis (control group) were enrolled. Ultrasound ultramicro-flow imaging of the fingertips was conducted on the 1st, 2nd, and 3rd days post-admission to assess fingertip ultramicrovascular density. Simultaneously, arterial blood lactate (LAC) concentrations were measured. The Sequential Organ Failure Assessment (SOFA) scores and 28-day mortality rates were also documented. The ultramicrovascular indices, along with SOFA scores, LAC concentrations, and 28-day mortality rates, were compared across the three groups. Correlations were analyzed between fingertip ultramicrovascular indices and SOFA scores, LAC concentrations, and 28-day mortality.</div></div><div><h3>Results</h3><div>Fingertip ultramicrovascular density was significantly lower in sepsis and septic shock groups than in controls (P &lt; 0.05). The septic shock group exhibited reduced ultramicrovascular density relative to the sepsis group (P &lt; 0.05). A strong negative correlation was found between ultramicrovascular density and clinical indicators, including SOFA scores, LAC concentrations, and 28-day mortality rates. Lower ultramicrovascular density was associated with higher SOFA scores and increased lactate levels, underscoring its prognostic value in sepsis and septic shock.</div></div><div><h3>Conclusion</h3><div>Ultrasound ultramicro-flow imaging accurately assesses microcirculation in sepsis and septic shock, correlating closely with organ dysfunction and prognosis, making it a valuable tool for evaluating sepsis severity.</div></div>","PeriodicalId":16920,"journal":{"name":"Journal of Radiation Research and Applied Sciences","volume":"18 3","pages":"Article 101597"},"PeriodicalIF":1.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrative diagnostics of cancer's extracellular matrix: Synergizing imaging and multi-omics for precision medicine","authors":"Vadanasundari Vedarethinam ,&nbsp;Vijayakumar Mayakrishnan ,&nbsp;Ravishankar Ram Mani ,&nbsp;Soon Woong Chang ,&nbsp;Balasubramani Ravindran","doi":"10.1016/j.jrras.2025.101636","DOIUrl":"10.1016/j.jrras.2025.101636","url":null,"abstract":"<div><div>The extracellular matrix (ECM) is a highly dynamic and biologically active network that plays a critical role in tissue homeostasis, development, and disease. In cancer, ECM remodeling—characterized by altered protein composition, increased matrix-degrading enzyme activity, and basement membrane disruption—contributes significantly to tumor progression, invasion, and metastasis. Understanding these molecular alterations is essential for improving cancer diagnostics and therapeutics. This review explores advanced methodologies for investigating ECM dynamics, with a particular focus on the integration of mass spectrometry and molecular imaging. Mass spectrometry offers high-resolution proteomic and metabolomic profiling, enabling detailed characterization of ECM composition and post-translational modifications. Concurrently, molecular imaging modalities such as PET, SPECT, and MRI provide non-invasive, in vivo visualization of ECM alterations and tumor microenvironment changes. The synergistic use of these platforms allows for comprehensive spatial and molecular insights into ECM remodeling, supporting early cancer detection, real-time monitoring of therapeutic response, and development of ECM-targeted treatments. Moreover, circulating ECM-derived proteins are emerging as promising biomarkers for liquid biopsy-based cancer diagnosis. The convergence of imaging and mass spectrometry technologies holds great potential to enhance diagnostic precision and inform personalized treatment strategies. This integrative approach represents a transformative step toward improved clinical outcomes in cancer care.</div></div>","PeriodicalId":16920,"journal":{"name":"Journal of Radiation Research and Applied Sciences","volume":"18 3","pages":"Article 101636"},"PeriodicalIF":1.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unsupervised spatial registration of fetal cranial ultrasound slices for radiomics analysis","authors":"Shouyu Jiang ,&nbsp;Zhong Chen ,&nbsp;Yan Zhuang ,&nbsp;Lin Han ,&nbsp;Yao Xiao ,&nbsp;Zhan Hua ,&nbsp;Rui Wang ,&nbsp;Qian Feng ,&nbsp;Ke Chen ,&nbsp;Jiangli Lin","doi":"10.1016/j.jrras.2025.101602","DOIUrl":"10.1016/j.jrras.2025.101602","url":null,"abstract":"<div><h3>Objective:</h3><div>Ultrasound examinations are clinically required for pregnant women to determine whether the fetal brain is developing normally. Doctors often need to manually adjust the 2-dimensional (2D) ultrasound probe to obtain a standard cranial plane for conducting fetal cranial ultrasound radiomics analysis, a process that is both challenging and time-consuming. To address this issue, this paper proposes an unsupervised registration method based on contrastive learning aimed at predicting the position of the 2D slice in 3-dimensional (3D) space.</div></div><div><h3>Methods:</h3><div>We exploit the anatomical consistency of adjacent slices in cranial space and introduce a novel pretext task. This task enables the contrastive learning model to learn the features of 2D slices at different spatial locations. Then, an automated spatial sampling method is used to construct a retrieval database that contains anatomical and spatial information for slices at various positions, which is used to perform spatial registration of 2D slices at arbitrary locations.</div></div><div><h3>Results:</h3><div>We evaluated our method using 39 cases of mid-gestation 3D ultrasound data from the hospital. The experimental results demonstrate that our method achieves excellent performance across four registration metrics, with plane angle at 6.870°, Euclidean distance at 8.969 voxels, normalized cross-correlation at 0.882, and structural similarity at 0.771. The results confirm the efficiency of our method with small sample data and demonstrate its reliable generalization and transferability.</div></div><div><h3>Conclusion:</h3><div>This method can provide clinicians with precise positional guidance for the rapid localization of standard planes, which can be used for subsequent fetal cranial radiomics research. Moreover, our approach does not require predefined registration standards or manual annotations, and it can be extended to other registration tasks, offering a reference for researchers.</div></div>","PeriodicalId":16920,"journal":{"name":"Journal of Radiation Research and Applied Sciences","volume":"18 3","pages":"Article 101602"},"PeriodicalIF":1.7,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of knowledge, availability, and practice of interventional radiation safety among nurses in the cardiac unit","authors":"Majdi Alzoubi ,&nbsp;Khalid AL-Mugheed ,&nbsp;Mohammad Minwer Alnaeem ,&nbsp;Islam Oweidat ,&nbsp;Manar Ali Bani-Hani ,&nbsp;Sally Mohammed Farghaly Abdelaliem","doi":"10.1016/j.jrras.2025.101649","DOIUrl":"10.1016/j.jrras.2025.101649","url":null,"abstract":"<div><div>Nurses are regarded as the backbone of healthcare services due to their critical role in delivering patient care across healthcare institutions. This study aimed to evaluate the knowledge, availability, and practices related to interventional radiation safety among nurses working in cardiac units in Jordan. A cross-sectional survey was conducted using a 30-item structured questionnaire distributed via a Google Form to nurses in cardiac units. Multiple logistic regression to identify significant predictors of good interventional radiation knowledge. A total of 145 respondents took part, with a mean age of 34.8 (SD = 8.20). The females make up 46.2 % and males 53.8 %. Over half of the respondents indicated either never using the ionizing machine (28.3 %) or using it daily (29.0 %) and agreed that its use is necessary (53.8 %). Only 17.2 % correctly identified the annual normal background radiation exposure. Most participants reported that sufficient protective equipment is available for use with such machinery (66.9 %). In addition, increasing age (AOR = 11.1, p-value = 0.006), having a master's degree (AOR = 4.11, p-value = 0.036), and having more than 10 years of work experience (AOR = 3.67, p-value = 0.036) significantly predict basic knowledge of radiation exposure and usage. The participants in the study have a low basic knowledge of radiation exposure and usage. Nurses should be more educated on frequently overlooked safety procedures and kept up to date on the latest developments through the implementation of annual recertification courses.</div></div>","PeriodicalId":16920,"journal":{"name":"Journal of Radiation Research and Applied Sciences","volume":"18 3","pages":"Article 101649"},"PeriodicalIF":1.7,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-dimensional speckle tracking imaging to assess myocardial ischemia and left ventricular function after coronary artery bypass grafting in coronary heart disease patients","authors":"Zhongjie Fang ,&nbsp;Jie Song ,&nbsp;Lebo Sun ,&nbsp;Huoshun Shi ,&nbsp;Zongbo Wang ,&nbsp;Qinbo Shen ,&nbsp;Caimin Zhu ,&nbsp;Guofeng Shao","doi":"10.1016/j.jrras.2025.101642","DOIUrl":"10.1016/j.jrras.2025.101642","url":null,"abstract":"<div><h3>Objective</h3><div>This study evaluated the effects of coronary artery bypass grafting (CABG) on myocardial ischemia and left ventricular function in patients with coronary heart disease (CHD) using three-dimensional speckle tracking imaging (3D-STI).</div></div><div><h3>Methods</h3><div>Fifty-one CHD patients who underwent CABG were included as observation group, and 49 healthy volunteers served as controls. Sample size was determined based on power analysis (α = 0.05, β = 0.20) to detect a 5 % difference in left ventricular ejection fraction (LVEF). The basic data of the two groups of subjects were obtained, including conventional echocardiography and 3D-STI images before surgery, 30 days and 60 days after surgery. The following key echocardiographic parameters, including LVEF and end-diastolic diameter, were measured to assess myocardial function.</div></div><div><h3>Results</h3><div>LVEF substantially (<em>P</em> &lt; 0.05) improved from 56.34 ± 10.08 preoperatively to 61.02 ± 8.24 at 60 days postoperatively. Left ventricular end-diastolic diameter (LVEDd), left ventricular end-diastolic volume (LVEDv), and left ventricular end-systolic volume (LVESv) were improved 30 days and 60 days after the surgery versus their values before the surgery, showing statistically marked (<em>P</em> &lt; 0.05) differences. The local myocardial SLs, SrLs, and SrLe of the original ischemic segment in observation group were substantially improved 30 days and 60 days after the surgery versus those before surgery (<em>P</em> &lt; 0.05). The postoperative global peak longitudinal strain (GLS) and GLS-Avg of observation group were improved versus those before the surgery (<em>P</em> &lt; 0.05). These improvements indicate that CABG effectively restores left ventricular function and reduces myocardial ischemia in CHD patients.</div></div><div><h3>Conclusion</h3><div>CABG not only effectively alleviates myocardial ischemia in patients with CHD, and promotes the recovery of left ventricular function but also improves the overall prognosis of cardiac function. 3D-STI can serve as an important tool for the objective assessment of surgical outcomes, providing strong support for clinical decision-making. 3D-STI outperformed conventional 2D-STI in detecting subtle post-CABG strain improvements, particularly in apical segments.</div></div>","PeriodicalId":16920,"journal":{"name":"Journal of Radiation Research and Applied Sciences","volume":"18 3","pages":"Article 101642"},"PeriodicalIF":1.7,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Type II heavy tailed family with applications to engineering, radiation biology and aviation data","authors":"Ahmed R. El-Saeed ,&nbsp;Okechukwu J. Obulezi ,&nbsp;M.M. Abd El-Raouf","doi":"10.1016/j.jrras.2025.101547","DOIUrl":"10.1016/j.jrras.2025.101547","url":null,"abstract":"<div><div>The study proposes the Type II Heavy-Tailed family with a particular distribution called the Type II Heavy-Tailed Weibull distribution as its extension, which has the main purpose of fitting heavy-tailed data. Special cases of the TII-HTW distribution featuring new models, namely the reduced Type II heavy-tailed Weibull (reduced TII-HTW), Type II heavy-tailed exponential (TII-HTE), and Type II heavy-tailed Rayleigh (TII-HTR) distributions, were identified for further studies. The statistical properties concerning moments and half-life along with probability density functions and other functions are derived and investigated. Some of the methods used to estimate parameters are Maximum Likelihood Estimation (MLE), Maximum Product Spacing (MPS), Least Squares (LS), Weighted Least Squares (WLS), Cramér-von Mises (CvM) and Anderson–Darling (AD), Right-Tailed Anderson–Darling, and Bayesian Estimation. To check the estimation methods, a Monte Carlo simulation has been run with the parameters being fixed initial values, which were carefully fixed to represent realistic scenarios to guarantee remaining stable and convergence of methods. The results indicate that MLE appeared to be consistent and effective; however, LS estimates and WLS and CvM estimators appeared to be reliable. Bayesian estimates seemed to have given good results with larger sample sizes. The applicability of the model against real datasets was performed, and the model showed an improved capacity in characterizing heavy-tailed behavior. The results emphasize possible applications of the distribution in reliability analysis, survival modeling, and financial risk, with suggested future research options involving high-dimensional extensions and alternative estimation methods.</div></div>","PeriodicalId":16920,"journal":{"name":"Journal of Radiation Research and Applied Sciences","volume":"18 3","pages":"Article 101547"},"PeriodicalIF":1.7,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of emergency surgery for distal femoral fracture using the locking compression plate: A retrospective analysis","authors":"Meiyi Sun ,&nbsp;Zhenqing Zhang ,&nbsp;Yinan Chen ,&nbsp;Zhenqiang Wang ,&nbsp;Congliang Gao ,&nbsp;Dakou Li","doi":"10.1016/j.jrras.2025.101618","DOIUrl":"10.1016/j.jrras.2025.101618","url":null,"abstract":"<div><h3>Objective</h3><div>To compare the effects of emergency surgery versus elective surgery using the locking compression plate (LCP) for the treatment of distal femoral fracture (DFF).</div></div><div><h3>Methods</h3><div>Sixty DFF patients admitted between June 2022 and October 2023 were analyzed retrospectively, including 32 cases of emergency surgery (emergency group) and 28 cases of elective surgery (elective group). The preoperative waiting time, operation time (OT), intraoperative blood loss (IBL), hospitalization expenses, fracture healing time, as well as knee joint function (Hospital for Special Surgery, HSS), and pain (Visual Analogue Scale, VAS) during plate removal were statistically analyzed. Finally, treatment satisfaction was investigated.</div></div><div><h3>Results</h3><div>The emergency group had lower preoperative waiting time, hospitalization expenses and hospitalization time than the elective group (<em>p</em> &lt; 0.05), with lower preoperative complications (3.13 % vs. 7.14 %, <em>p</em> &lt; 0.05) and no difference in clinical efficacy (<em>p</em> &gt; 0.05). The emergency group had fewer preoperative complications (hypoproteinemia: 0 % vs. 14.29 %, <em>p</em> = 0.028). At 3 months after surgery, the HSS score of the emergency group was higher than that of the elective group, and the treatment satisfaction was higher (<em>p</em> &lt; 0.05).</div></div><div><h3>Conclusions</h3><div>Emergency surgery using the LCP for DFF reduced hospitalization expenses and preoperative waiting time and safe and is beneficial to improve early postoperative knee function (3-month follow-up) of patients.</div></div>","PeriodicalId":16920,"journal":{"name":"Journal of Radiation Research and Applied Sciences","volume":"18 3","pages":"Article 101618"},"PeriodicalIF":1.7,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of radiation and heat source/sink on dissipative MHD mixed convection flow of casson nanofluid over a stretching sheet with chemical reaction","authors":"Jayaramireddy Konda ,&nbsp;Charankumar Ganteda ,&nbsp;Zabidin Salleh ,&nbsp;Indira Sundaram ,&nbsp;Mustafa Inc ,&nbsp;B. Ramakrishna ,&nbsp;Saiful Islam ,&nbsp;Vediyappan Govindan","doi":"10.1016/j.jrras.2025.101584","DOIUrl":"10.1016/j.jrras.2025.101584","url":null,"abstract":"<div><div>This study presents a numerical investigation of transverse magnetohydrodynamic (MHD) Casson nanofluid (CNF) flow over a nonlinear expanding surface, considering the effects of thermal radiation, heat generation/absorption, and chemical reactions. The research is significant due to its applications in biomedical engineering, polymer manufacturing, and industrial cooling systems, where precise control of heat and mass transfer is essential. The Casson fluid model is adopted to account for non-Newtonian behavior, and the effects of Brownian motion and thermophoresis are incorporated to enhance the understanding of nanoparticle transport mechanisms.</div><div>The governing boundary-layer equations are converted into ordinary differential equations (ODEs) using similarity transformations. The Homotopy analysis method (HAM) is employed to obtain analytical solutions, providing a deeper insight into the parametric effects on flow characteristics. The study examines the influence of various parameters, including the Casson fluid parameter, Prandtl number (PN) (Pr), magnetic field parameter (M), Brownian motion parameter (Nb), nonlinear stretching parameter (n), Lewis number (<em>Le</em>), thermophoresis parameter (Nt), and chemical reaction rate, on velocity, temperature, and concentration distributions. Unlike previous studies, the PN is treated as a variable parameter to account for temperature-dependent viscosity variations.</div><div>The findings reveal that increasing the Casson parameter reduces velocity due to enhanced fluid viscosity, while higher magnetic field strength suppresses flow due to Lorentz force effects. Additionally, Brownian motion and thermophoresis significantly impact temperature and nanoparticle concentration profiles, highlighting their importance in nanofluid transport. The study also presents graphical and tabular analyses of skin friction, heat transfer rate, and mass transfer rate, demonstrating their variations with key governing parameters. These results provide valuable insights for optimizing heat and mass transport in complex fluid systems.</div></div>","PeriodicalId":16920,"journal":{"name":"Journal of Radiation Research and Applied Sciences","volume":"18 3","pages":"Article 101584"},"PeriodicalIF":1.7,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}