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Experimental design of paraffin/methylated melamine-formaldehyde microencapsulated composite phase change material and the application in battery thermal management system

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Journal of Materials Science & Technology 2024年第2期169卷 124-136页

作者： Que Huang Silong Wang Jichun He Dengji Xu Safaa NAbdou Mohamed Mibrahim Shiqi Sun Yanjun Chen Handong Li ben Bin Xu Changcheng Liu Zeinhom M.El-Bahy Zhanhu Guo School of Environment and Safety Engineering North University of ChinaTaiyuan 030051China Institute of Advanced Energy Materials and Systems North University of ChinaTaiyuan 030051China School of Resources and Safety Engineering Central South UniversityChangsha 410010China School of Medical and BioInformation Engineering Northeastern UniversityShenyang 110819China Department of Chemistry Khurmah University CollegeTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City 11884CairoEgypt

In order to maintain the optimal operating temperature of the battery surface and meet the demand for thermal storage technology,battery thermal management system based on phase change materials has attracted increasing *** this work,a kind of core-shell structured microcapsule was synthesized by an in-situ polymerization,where paraffin was used as the core,while methanol was applied to mod-ify the melamine-formaldehyde shell to reduce toxicity and improve thermal ***,three different types of heat conductive fillers with the same content of 10 wt.%,i.e.,nano-Al_(2)O_(3),nano-ZnO and carbon nanotubes were added,generating *** microcapsules were uniform,and were not affected by the thermal fillers,which were evenly dispersed *** composite sample with carbon nanotubes(10 wt.%)showed the highest thermal conductivity of 0.50 W/(m K)and latent heat of 139.64 J/***,according to the leakage testing and battery charge/discharge experiments,compared with Al_(2)O_(3)and ZnO,the addition of carbon nanotubes remarkably enhances the heat storage ability as latent heat from 126.98 J/g for the prepared sample with Al_(2)O_(3)and 125.86 J/g for the one with ZnO,then to 139.64 J/g,as well as dissipation performance as a cooling effect by decreasing the sur-face temperature of battery from 2%to 12%of microcapsule,composite sample with carbon nanotubes presents a broad application prospect in battery thermal management system and energy storage field.

关键词： Microcapsule Phase change material Battery Carbon nanotube Safety

Analytic Beta-Wavelet Transform-Based Digital Image Watermarking for Secure Transmission

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Computers, Materials & Continua 2022年第3期70卷 4657-4673页

作者： Hesham Alhumyani ibrahim Alrube Sameer Alsharif Ashraf Afifi Chokri ben Amar Hala S.El-Sayed Osama S.Faragallah Department of Computer Engineering College of Computers and Information TechnologyTaif UniversityP.O.11099Taif21944Saudi Arabia Department of Electrical Engineering Faculty of EngineeringMenoufia UniversityShebin El-Kom32511Egypt Department of Information Technology College of Computers and Information TechnologyTaif UniversityP.O.11099Taif21944Saudi Arabia

The rapid development in the information technology field has introduced digital watermark technologies as a solution to prevent unauthorized copying and redistribution of *** article introduces a self-embedded image verification and integrity *** images are firstly split into dedicated segments of the same block ***,different Analytic Beta-Wavelet(ABW)orthogonal filters are utilized for embedding a self-segment watermark for image segment using a predefined *** orthogonal filter coefficients are estimated to improve image reconstruction under different block *** conduct a comparative study comparing the watermarked images using three kinds of ABW filters for block sizes 64×64,128×128,and 256×*** embed the watermark using the ABW-based image watermarking method in the 2-level middle frequency sub-bands of the ABW digital image *** imperceptibility and robustness of the ABW-based image watermarking method image is evaluated based on the Peak Signal to Noise Ratio(PSNR)and Correlation coefficient *** the implementation results,we came to know that this ABW-based image watermarking method can withstand many image manipulations compared to other existing methods.

关键词： Watermarking ABW median filtering JPEG compression PSNR

Feature Selection with Optimal Stacked Sparse Autoencoder for Data Mining

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Computers, Materials & Continua 2022年第8期72卷 2581-2596页

作者： Manar Ahmed Hamza Siwar ben Haj Hassine ibrahim Abunadi Fahd N.Al-Wesabi Hadeel Alsolai Anwer Mustafa Hilal Ishfaq Yaseen Abdelwahed Motwakel Department of Computer and Self Development Preparatory Year DeanshipPrince Sattam bin Abdulaziz UniversityAl-Kharj16278Saudi Arabia Department of Computer Science College of Science and Arts at MahayilKing Khalid UniversityMuhayel Aseer62529Saudi Arabia Department of Information Systems Prince Sultan UniversityRiyadh11586Saudi Arabia Faculty of Computer and IT Sana’a UniversitySana’a61101Yemen Department of Information Systems College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversitySaudi Arabia

Data mining in the educational field can be used to optimize the teaching and learning performance among the *** recently developed machine learning(ML)and deep learning(DL)approaches can be utilized to mine the data *** study proposes an Improved Sailfish Optimizer-based Feature SelectionwithOptimal Stacked Sparse Autoencoder(ISOFS-OSSAE)for data mining and pattern recognition in the educational *** proposed ISOFS-OSSAE model aims to mine the educational data and derive decisions based on the feature selection and classification ***,the ISOFS-OSSAEmodel involves the design of the ISOFS technique to choose an optimal subset of ***,the swallow swarm optimization(SSO)with the SSAE model is derived to perform the classification *** showcase the enhanced outcomes of the ISOFSOSSAE model,a wide range of experiments were taken place on a benchmark dataset from the University of California Irvine(UCI)Machine Learning *** simulation results pointed out the improved classification performance of the ISOFS-OSSAE model over the recent state of art approaches interms of different performance measures.

关键词： Data mining pattern recognition feature selection data classification SSAE model

Diagnostic Delay and Associated Clinical Features of Tuberculosis among Adult Patients with Acute Myeloid Leukemia in Doha, Qatar

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Journal of Tuberculosis Research 2018年第1期6卷 49-62页

作者： Halima El Omri Ruba Taha Wanis ibrahim Nancy Kassem Lajos Szabados Hesham El Sabah Fatma ben Abid Amna Gamiel Aisha Al Khinji Wojciech Szmeigielski Saba Hasan ibrahim Al Hijji Hematology and Medical Oncology Hamad Medical Corporation Doha Qatar Internal Medicine Hamad Medical Corporation Doha Qatar Clinical Pharmacy NCCCR Hamad Medical Corporation Doha Qatar Nuclear Medicine and PET-CT Hamad Medical Corporation Doha Qatar Infection Disease Hamad Medical Corporation Doha Qatar Radiology NCCCR Hamad Medical Corporation Doha Qatar

Background: Tuberculosis is currently the world’s leading cause of death arising from a single infectious condition. While T cell mediated immunity is recognized to have a major contribution to tuberculosis activation, the present investigation confirmed that TB was more prevalent among patients with acute myeloid rather than lymphoid leukemia and such association was frequently overlooked. The primary objective of this study is to estimate the diagnostic delay of tuberculosis among patients with acute myeloid leukemia (AML) and compare it to the general population in Qatar. Secondary objective is to study the clinical and epidemiologic characteristics of tuberculosis in patients with AML. Methods: This is a retrospective study of tuberculosis cases diagnosed in subjects with AML during the period from January 2008 till December 2016. Results: Among 215 subjects with AML identified during the study period, 12 (5.58%) received the diagnosis of tuberculosis. The estimated incidence of tuberculosis among AML cases was 7.14 cases per 1000 per year. The mean delay in diagnosis of tuberculosis was 64.2 days (95% CI: 26.8 - 101.5) and the median was 45 days (interquartile range;Q1 - Q3, 29.5 - 97.5). Prolonged fever was the most common presentation (100% of cases). Parenchymal lung involvement was the most common radiologic abnormality (83.3% of cases). Three patients (25%) died and 8 patients completed 9 to 12 months of anti-tuberculous treatment with clinical and radiological remission. Conclusion: Infections caused by Mycobacterium tuberculosis are not uncommon in patients with AML especially in patients from tuberculosis endemic regions. It constitutes a diagnostic challenge so high index of suspicion is of paramount importance.

关键词： Tuberculosis Acute Myeloid Leukemia Neutropenia

Anharmonic Potentials Analysis through the Floquet Representation

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Journal of Applied Mathematics and Physics 2020年第1期8卷 184-195页

作者： Mohammed Janati Idrissi Abdelaziz Fedoul salaheddine Sayouri ibrahim Amila Laboratory of Theoretical and Applied Physics Faculty of Sciences Dhar Al Mahraz University of Sidi Mohamed Ben Abdellah Fez Morocco

We propose an approach based on Floquet theorem combined with the resonating averages method (RAM), to solve the time-dependent Schrödinger equation with a time-periodic Hamiltonian. This approach provides an alternative way to determine directly the evolution operator, and then we deduct the wave functions and the corresponding quasi-energies, of quantum systems. An application is operated for the driven cubic or/and quatric anharmonic as well as for the Morse potential. Comparisons of our results with those of other authors are discussed, and numerical evaluations are performed, to determine the dissociation energy of (HCl) and (CO) molecules.

关键词： Floquet Theorem Resonating Averages Anharmonic Potential

About 2 Cases of Accidental Discovery of Broncholithiasis

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Open Journal of Thoracic Surgery 2018年第2期8卷 37-42页

作者： Harmouchi Hicham Rabiou Sani Sidibe Kassim Issoufou ibrahim Belliraj Layla Ammor Fatimazahra Lakranbi Marouane Ouadnouni Yassine Smahi Mohammed Department of Thoracic Surgery CHU Hassan II of Fez-Morocco Fez Morocco Department of Imagery CHU Hassan II of Fez-Morocco Fez Morocco Faculty of Medicine and Pharmacy Sidi Mohamed Ben Abdellah University Fez Morocco

Broncholithiasis is the presence of calcified material in the bronchial lumen. Bronchial fibroscopy and thoracic CT are the main paraclinical elements for diagnosis. However, most broncholithiasis is fortuitous discovery intraoperatively. The evolution may be marked by complications in the underlying lung, or fistulization in the mediastinal structures especially the esophagus. Early on, management can be simple monitoring or endoscopic extraction of broncholithiasis. Surgery remains the only option in case of complications. The authors report 2 cases of broncholithiasis, one of which was diagnosed radiologically and the other of incidental discovery during the surgical exploration of a lesion of the right lower lobe.

关键词： Broncholithiasis Fistula Lymphadenopathy Tuberculosis

Single Pulmonary Nodule Management: Experience of a Moroccan Center about 24 Patients

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Open Journal of Thoracic Surgery 2018年第2期8卷 43-49页

Introduction: The management of single pulmonary nodule remains difficult, since it is of multiple etiologies. The endemicity of tuberculosis and hydatidosis in our context makes the etiological orientation even more difficult. Materials and Methods: This is a retrospective study, involving 24 patients, all operated on for a single pulmonary nodule in the department of thoracic surgery of CHU Hassan II of Fez over a period of 8 years. Results: There were 15 men and 9 women, with an average age of 51 years. 45.4% of patients had a history of known neoplasia. Discovery was fortuitous in 54% of cases. The radiologic diagnosis based on thoracic computed tomography had objectified an isolated nodule in all the patients with a right localization in 71% of the cases It was a solid pulmonary nodule in 91.5% of cases, and a frosted glass appearance in 8.5%. Bronchial fibroscopy was contributory in one case which was a carcinoid tumor. The approach was a conservative postero-lateral thoracotomy in 22 patients. The gesture was atypical resection in 67%, and lobectomy in 24.5% of cases, in the context of centrilobular nodules. The etiologies were dominated by pulmonary metastases in 29% of cases, pulmonary tuberculosis in 21% of cases. The postoperative course was simple in all patients. Conclusion: The pathological antecedents and the characteristics of the nodule on the imaging are essential elements allowing an etiological orientation. However, the pathological study remains the only method to confirm the diagnosis.

关键词： Pulmonary Nodule Computed Tomography Diagnostic Metastasis Tuberculoma Surgery

Surgical Management of Pyothorax: A Series of 172 Cases

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Open Journal of Thoracic Surgery 2018年第2期8卷 50-56页

作者： Harmouchi Hicham Rabiou Sani Issoufou ibrahim Sidibe Kassim Belliraj Layla Ammor Fatimazahra Lakranbi Marouane Ouadnouni Yassine Smahi Mohammed Department of Thoracic Surgery CHU Hassan II of Fez-Morocco Fez Morocco Department of Imagery CHU Hassan II of Fez-Morocco Fez Morocco Faculty of Medicine and Pharmacy Sidi Mohamed Ben Abdellah University Fez Morocco

Introduction: The pyothorax or thoracic empyema is defined by the presence between the two pleural layers of a purulent liquid, or a non-purulent liquid, but with bacteriological or biochemical characteristics testifying to a microbial invasion. The use of early medical treatment prevents the passage to pleural encystment, whose management remains surgical. Material and Methods: Our study was performed retrospectively, in the department of thoracic surgery of CHU Hassan II of Fez, between 2010 and 2016, involving 172 patients operated for pyothorax. Results: Among the 172 patients included in our study, there were 110 men and 67 women. The average age was 32.11 years old. The clinical picture was dominated by pleural syndrome in 56% of cases, signs of tuberculous impregnation in 44.1% of cases. Preoperative preparation with thoracic drainage, bi-antibiotic therapy and respiratory physiotherapy was performed in 90% of cases. The attack was right in 55.8% of cases and left in 44.1%. A chest CT scan performed in all patients showed pachypleuritis in all cases. The tuberculous pyothorax accounted for 54% of cases, those by intra pleural rupture of a pulmonary hydatid cyst in 10.4%, para-pneumonic origin in 5.2% and post-traumatic in 4.06%. The origin was undetermined in 26.16%. A conservative posterolateral thoracotomy was performed in all our patients. The pulmonary release was done through the extrapleural plane in 94% of cases, and pleuropulmonary decortication performed in all cases. Atypical resection was associated in 4.3% of cases and peri-cytectomy in 13.9% of cases. Operative follow-up was simple in 79.6% of cases. The main postoperative complications were a prolonged aerial leak in 16.7%, atelectasis in 4.5%, a wall infection in 6.5%, a hemothorax refrained in 3.2% of cases. The average follow-up was 2.5 years. Conclusion:?Tuberculosis remains the most common etiology of pyothorax in our setting. Early management plays an important role in reducing the morbidi

关键词： Pyothorax Pachypleuritis Thoracic Drainage Decortication Surgery

Experimental Investigation of the Effect of Graphene Nanosheets on the Optical-Electrical Properties of Vanadium Oxide Nanocomposites

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Graphene 2016年第1期5卷 14-24页

作者： Issam Derkaoui Mohammed Khenfouch ibrahim Elmokri Sabata Jonas Moloi Bakang Moses Mothudi Mokhotjwa Simon Dhlamini Malik Maaza Izeddine Zorkani Anouar Jorio Group of Nanomaterials and Renewable Energies Laboratory of Solid State Physics Faculty of Sciences Dharel Mahraz University Sidi Mohamed Ben Abdellah Atlas Fez Morocco UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology College of Graduate Studies University of South Africa Pretoria South Africa Nanosciences African Network (NANOAFNET) iThemba LABS-National Research Foundation Somerset West Western Cape South Africa Physics Department College of Science Engineering and Technology Science Campus University of South Africa Johannesburg South Africa

We report the structural, optical and electrical properties of Graphene-Vanadium oxide nanoparticles (rGO/VO-NPs) nanocomposites prepared via a hydrothermal method on glass substrates. The samples have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (ATR-FTIR), Raman spectroscopy, ultraviolet-visible spectra (Uv-Vis) (absorbance/reflectance) and electrical conductivity. Our results are revealing a remarkable effect on the morphology and structure of vanadium oxide nanoparticles. Hence, the graphene layers improved their electrical conductivity and highly influenced their optical properties. Therefore, the obtained results may lead to better performance for a large field of applications.

关键词： Vanadium Oxide Graphene Optical Properties Electrical Conductivity Nanorods