Due to advanced technology,electromagnet interference and dissipation problems in the electronic and portable devices at GHz range are increasing daily.Magnetic absorbing materials with outstanding electromagnetic pro...Due to advanced technology,electromagnet interference and dissipation problems in the electronic and portable devices at GHz range are increasing daily.Magnetic absorbing materials with outstanding electromagnetic properties,wide bandwidth,and strong absorption are highly desirable.The present investigation deals with the preparation of Ni-Mg-Cu-Zn(NMCZ)substituted nano ferrites with composition of Ni_(0.3)Mg_(0.2)Cu_(0.3)Zn_(0.2)X_(0.02)Fe_(1.98)O_(4)(X=Nd,Ho,Pr,Gd,Yb).X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),a vibratory sample magnetometer(VSM),and a Vector network analyzer(VNA)were used to investigate these rare earth-doped nanocrystalline ferrites'features.XRD reveals the single spinel phase structure in all Ni-Mg-Cu-Zn ferrites.FTIR spectroscopy shows the presence of tetrahedral and octahedral bands of spinel ferrites.FESEM images reveal the lowest agglomeration for the Ho-doped NMCZ nano-spinel ferrites sample.TEM images show the hexagon shapes of the Yb-and Nd-doped NMCZ ferrites.Pr-doped NMCZ ferrites show more coercivity than other rare earth metals substituted NMCZ nanocrystalline ferrites.VSM analysis was used to calculate the magnetic features like initial permeability,magnetic anisotropy constant,remanence,coercivity,and magnetic moment.High-frequency switching field distributions(SFD)analyses were also investigated.Magnetodielectric characteristics such as losses,permittivity,modulus,Q,ac conductivity,and impedance of the Nd^(-),Ho^(-),Pr^(-),Gd^(-),Yb-doped Ni-Mg-Cu-Zn ferrites were evaluated.The minimum reflection loss(-57.3 dB)is found at 1.4 GHz for Pr-doped Ni-Mg-Cu-Zn ferrite absorber.However,the reflection loss(RL)of-53.9 dB at 2.9 GHz is observed for Ho-doped Ni-Mg-Cu-Zn ferrite absorber.Soft magnetization,low coercivity,outstanding magnetodielectric,and absorption properties of theNd^(-),Ho^(-),Pr^(-),Gd^(-)and Yb^(-)doped Ni-Mg-Cu-Zn ferrites are suitable candidates for absorption in telecommunication,defense,and technological industries.展开更多
Global mortality rates are greatly impacted by malignancies of the brain and nervous system.Although,Magnetic Resonance Imaging(MRI)plays a pivotal role in detecting brain tumors;however,manual assessment is time-cons...Global mortality rates are greatly impacted by malignancies of the brain and nervous system.Although,Magnetic Resonance Imaging(MRI)plays a pivotal role in detecting brain tumors;however,manual assessment is time-consuming and susceptible to human error.To address this,we introduce ICA2-SVM,an advanced computational framework integrating Independent Component Analysis Architecture-2(ICA2)and Support Vector Machine(SVM)for automated tumor segmentation and classification.ICA2 is utilized for image preprocessing and optimization,enhancing MRI consistency and contrast.The Fast-MarchingMethod(FMM)is employed to delineate tumor regions,followed by SVM for precise classification.Validation on the Contrast-Enhanced Magnetic Resonance Imaging(CEMRI)dataset demonstrates the superior performance of ICA2-SVM,achieving a Dice Similarity Coefficient(DSC)of 0.974,accuracy of 0.992,specificity of 0.99,and sensitivity of 0.99.Additionally,themodel surpasses existing approaches in computational efficiency,completing analysis within 0.41 s.By integrating state-of-the-art computational techniques,ICA2-SVM advances biomedical imaging,offering a highly accurate and efficient solution for brain tumor detection.Future research aims to incorporate multi-physics modeling and diverse classifiers to further enhance the adaptability and applicability of brain tumor diagnostic systems.展开更多
<strong>Background:</strong> Job satisfaction can affect workers’ behaviour, thereby influencing organisational performance. Workers with low levels of job satisfaction have negative attitudes toward thei...<strong>Background:</strong> Job satisfaction can affect workers’ behaviour, thereby influencing organisational performance. Workers with low levels of job satisfaction have negative attitudes toward their jobs and may cause depression and anxiety. <strong>Purpose:</strong> The main aim of this study is to measure the overall job satisfaction among radiographers in Taif city. <strong>Methods: </strong>This study used the Minnesota Scoring Questionnaire to measure job satisfaction. The data collection was conducted between September 2018 and April 2019 in all major hospitals in Taif. <strong>Results: </strong>This study revealed that the overall job satisfaction of radiographers was moderate. It is, however, higher among radiographers in armed forces hospitals compared with their counterparts in the Ministry of Health hospitals. The job satisfaction of male radiographers was greater than their female peers. Finally, job satisfaction was high in those who work in advanced modality departments. <strong>Conclusion: </strong>Job satisfaction is critical for healthcare workers. This study indicated that job satisfaction is moderate for radiographers in Taif hospitals. Factors affecting their satisfaction include the feel of independence and recognition.展开更多
基金Princess Nourah bint Abdulrahman University Researchers Supporting Project number(PNURSP2024R42),Princess Nourah bint Abdulrahman University,Riyadh,Saudi Arabiathe Deanship of Scientific Research at King Khalid University for funding this work through large group Research Project(RGP2/387/44)。
文摘Due to advanced technology,electromagnet interference and dissipation problems in the electronic and portable devices at GHz range are increasing daily.Magnetic absorbing materials with outstanding electromagnetic properties,wide bandwidth,and strong absorption are highly desirable.The present investigation deals with the preparation of Ni-Mg-Cu-Zn(NMCZ)substituted nano ferrites with composition of Ni_(0.3)Mg_(0.2)Cu_(0.3)Zn_(0.2)X_(0.02)Fe_(1.98)O_(4)(X=Nd,Ho,Pr,Gd,Yb).X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),a vibratory sample magnetometer(VSM),and a Vector network analyzer(VNA)were used to investigate these rare earth-doped nanocrystalline ferrites'features.XRD reveals the single spinel phase structure in all Ni-Mg-Cu-Zn ferrites.FTIR spectroscopy shows the presence of tetrahedral and octahedral bands of spinel ferrites.FESEM images reveal the lowest agglomeration for the Ho-doped NMCZ nano-spinel ferrites sample.TEM images show the hexagon shapes of the Yb-and Nd-doped NMCZ ferrites.Pr-doped NMCZ ferrites show more coercivity than other rare earth metals substituted NMCZ nanocrystalline ferrites.VSM analysis was used to calculate the magnetic features like initial permeability,magnetic anisotropy constant,remanence,coercivity,and magnetic moment.High-frequency switching field distributions(SFD)analyses were also investigated.Magnetodielectric characteristics such as losses,permittivity,modulus,Q,ac conductivity,and impedance of the Nd^(-),Ho^(-),Pr^(-),Gd^(-),Yb-doped Ni-Mg-Cu-Zn ferrites were evaluated.The minimum reflection loss(-57.3 dB)is found at 1.4 GHz for Pr-doped Ni-Mg-Cu-Zn ferrite absorber.However,the reflection loss(RL)of-53.9 dB at 2.9 GHz is observed for Ho-doped Ni-Mg-Cu-Zn ferrite absorber.Soft magnetization,low coercivity,outstanding magnetodielectric,and absorption properties of theNd^(-),Ho^(-),Pr^(-),Gd^(-)and Yb^(-)doped Ni-Mg-Cu-Zn ferrites are suitable candidates for absorption in telecommunication,defense,and technological industries.
基金supported by the Deanship of Graduate Studies and Scientific Research at Najran University through funding code NU/GP/MRC/13/771-1.
文摘Global mortality rates are greatly impacted by malignancies of the brain and nervous system.Although,Magnetic Resonance Imaging(MRI)plays a pivotal role in detecting brain tumors;however,manual assessment is time-consuming and susceptible to human error.To address this,we introduce ICA2-SVM,an advanced computational framework integrating Independent Component Analysis Architecture-2(ICA2)and Support Vector Machine(SVM)for automated tumor segmentation and classification.ICA2 is utilized for image preprocessing and optimization,enhancing MRI consistency and contrast.The Fast-MarchingMethod(FMM)is employed to delineate tumor regions,followed by SVM for precise classification.Validation on the Contrast-Enhanced Magnetic Resonance Imaging(CEMRI)dataset demonstrates the superior performance of ICA2-SVM,achieving a Dice Similarity Coefficient(DSC)of 0.974,accuracy of 0.992,specificity of 0.99,and sensitivity of 0.99.Additionally,themodel surpasses existing approaches in computational efficiency,completing analysis within 0.41 s.By integrating state-of-the-art computational techniques,ICA2-SVM advances biomedical imaging,offering a highly accurate and efficient solution for brain tumor detection.Future research aims to incorporate multi-physics modeling and diverse classifiers to further enhance the adaptability and applicability of brain tumor diagnostic systems.
文摘<strong>Background:</strong> Job satisfaction can affect workers’ behaviour, thereby influencing organisational performance. Workers with low levels of job satisfaction have negative attitudes toward their jobs and may cause depression and anxiety. <strong>Purpose:</strong> The main aim of this study is to measure the overall job satisfaction among radiographers in Taif city. <strong>Methods: </strong>This study used the Minnesota Scoring Questionnaire to measure job satisfaction. The data collection was conducted between September 2018 and April 2019 in all major hospitals in Taif. <strong>Results: </strong>This study revealed that the overall job satisfaction of radiographers was moderate. It is, however, higher among radiographers in armed forces hospitals compared with their counterparts in the Ministry of Health hospitals. The job satisfaction of male radiographers was greater than their female peers. Finally, job satisfaction was high in those who work in advanced modality departments. <strong>Conclusion: </strong>Job satisfaction is critical for healthcare workers. This study indicated that job satisfaction is moderate for radiographers in Taif hospitals. Factors affecting their satisfaction include the feel of independence and recognition.
