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Torsional postbuckling characteristics of functionally graded graphene enhanced laminated truncated conical shell with temperature dependent material properties

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Theoretical & Applied mechanics Letters 2023年第4期13卷 272-279页

作者： Hamad m.hasan Saad S.Alkhfaji Sattar A.mutlag Department of mechanical Engineering University of AnbarRamadi 31001Iraq Department of medical Instrumentation Engineering Ashur University CollegeBaghdad 10044Iraq

Buckling and postbuckling characteristics of laminated graphene-enhanced composite(GEC)truncated conical shells exposed to torsion under temperature conditions using finite element method(FEm)simulation are presented in this *** the thickness direction,the GEC layers of the conical shell are ordered in a piece-wise arrangement of functionally graded(FG)distribution,with each layer containing a variable volume fraction for graphene *** calculate the properties of temperaturedependent material of GEC layers,the extended Halpin-Tsai micromechanical framework is *** FEm model is verified via comparing the current results obtained with the theoretical estimates for homogeneous,laminated cylindrical,and conical shells,the FEm model is *** computational results show that a piece-wise FG graphene volume fraction distribution can improve the torque of critical buckling and torsional postbuckling ***,the geometric parameters have a critical impact on the stability of the conical ***,a temperature rise can reduce the crucial torsional buckling torque as well as the GEC laminated truncated conical shell’s postbuckling strength.

关键词： Torsional postbuckling Graphene enhanced composite Functionally graded graphene Finite element method Conical shell

Does the Redshift Distribution of Swift Long GRBs Trace the Star-Formation Rate?

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Assessment of Nanoparticle-Enriched Solvents for Oil Recovery Enhancement

International Journal of Astronomy and Astrophysics（天文学与天体物理学国际期刊） 2024年第1期 20页

作者： Ali m.hasan Walid J.Azzam

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Fluid Dynamics & materials Processing 2023年第11期19卷 2827-2835页

作者： muayad m.hasan Firas K.Al-Zuhairi Anfal H.Sadeq Rana A.Azeez Department of Petroleum Technology University of Technology-IraqBaghdadIraq Department of Chemical Engineering University of Technology-IraqBaghdadIraq

Solvents are generally used to reduce the viscosity of heavy crude oil and ultimately enhance oil ***,a new method has been introduced where nanoparticles(NPs)are exploited to induce enhanced oil recovery owing to their ability to improve the mobility ratio,dampen the interfacial tension,and alter rock *** study investigated the integration of nano-alumina(Al_(2)O_(3))NPs with an n-hexane *** parti-cular,a Brookfield viscometer has been used to measure the crude oil viscosity and it has been found that NPs can effectively lead to a significant decrease in the overall oil viscosity(70 cp using the solvent only,45 cp when NPs are added).

关键词： Nanotechnology viscosity reduction organic solvents degree of viscosity reduction(DVR) enhanced oil recovery(EOR)

A New medical Image Enhancement Algorithm Based on Fractional Calculus

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Computers, materials & Continua 2021年第8期68卷 1467-1483页

作者： Hamid A.Jalab Rabha W.Ibrahim Ali m.hasan Faten Khalid Karim Ala’a R.Al-Shamasneh Dumitru Baleanu Faculty of Computer Science and Information Technology University MalayaKuala Lumpur50603Malaysia Nonlinear Dynamics Research Center(NDRC) Ajman UniversityAjman346UAE College of medicine Al-Nahrain UniversityBaghdad10001Iraq Department of Computer Science College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh84428Saudi Arabia Department of mathematics Cankaya UniversityBalgatAnkara06530Turkey Institute of Space Sciences Magurele-BucharestR76900Romania Department of medical Research China Medical UniversityTaichung40402Taiwan

The enhancement of medical images is a challenging research task due to the unforeseeable variation in the quality of the captured *** captured images may present with low contrast and low visibility,which might inuence the accuracy of the diagnosis *** overcome this problem,this paper presents a new fractional integral entropy(FITE)that estimates the unforeseeable probabilities of image pixels,posing as the main contribution of the *** proposed model dynamically enhances the image based on the image *** main advantage of FITE lies in its capability to enhance the low contrast intensities through pixels’***,the pixel probability of the fractional power is utilized to extract the illumination value from the pixels of the ***,the contrast of the image is then adjusted to enhance the regions with low ***,the fractional integral entropy approach is implemented to enhance the low visibility contents from the input *** were conducted on brain mRI,lungs CT,and kidney mRI scans datasets of different image qualities to show that the proposed model is robust and can withstand dramatic variations in *** obtained comparative results show that the proposed image enhancement model achieves the best BRISQUE and NIQE ***,this model improves the details of brain mRI,lungs CT,and kidney mRI scans,and could therefore potentially help the medical staff during the diagnosis process.

关键词： Fractional calculus image enhancement brain mRI lungs CT kidney mRI

Inflammation in human cerebral aneurysms: pathogenesis, diagnostic imaging, genetics, and therapeutics

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Neuroimmunology and Neuroinflammation 2015年第1期2卷 77-85页

作者： Sarah A.Dooley Joseph S.Hudson David m.hasan Department of Neurosurgery University of Iowa Carver College of MedicineIowa CityIA 52242USA Department of Neurosurgery University of IowaIowa CityIA 52242USA Department of Neurosurgery University of Iowa Hospital and ClinicsIowa CityIA 52240USA

Intracranial aneurysms are a life‑threatening cerebrovascular pathology with a probability of spontaneous *** intervention techniques carry inherent *** investigation has reinforced inflammation’s role in the pathophysiological process of cerebral *** data suggest alternative diagnostic and noninvasive therapeutic ***,novel characteristics of the underlying disease have been elucidated through distinct bioinformatic and gene expression profile *** article will emphasize the most recent investigation,highlighting findings of clinical significance and etiological relevance.

关键词： Diagnostic imaging genetics intracranial aneurysms pathogenesis therape

mapping the Dyke Swarms of the Eastern Desert, Egypt

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 28-页

作者： Zakaria Hamimi Basem Zoheir Safaa m.hasan Richard E.Ernst Geology Department Faculty of Science Benha University NARSS Department of Earth Sciences Carleton University

The Eastern Desert of Egypt hosts numerous undeformed to slightly deformed mafic dyke swarms which have previously been poorly *** use of full resolution Google Earth?images yields an initial

关键词： Egypt mapping the Dyke Swarms of the Eastern Desert

Theory for Charge Density Wave and Orbital-Flux State in Antiferromagnetic Kagome metal FeGe

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Chinese Physics Letters 2024年第4期41卷 90-104页

作者：马海洋殷嘉鑫 m.Zahid hasan 刘健鹏 School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China Quantum Science Center of Guangdong-HongKong-macao Greater Bay Area Shenzhen 518045China Laboratory for Topological Quantum matter and Advanced Spectroscopy(B7) Department of PhysicsPrinceton UniversityPrincetonNew Jersey 08544USA Princeton Institute for Science and Technology of materials Princeton UniversityPrincetonNew Jersey 08544USA materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA Liaoning Academy of materials Shenyang 110167China

We theoretically study the charge order and orbital magnetic properties of a new type of antiferromagnetic kagome metal *** on first-principles density functional theory calculations,we study the electronic structures,Fermi-surface quantum fluctuations,as well as phonon properties of the antiferromagnetic kagome metal *** is found that charge density wave emerges in such a system due to a subtle cooperation between electron-electron interactions and electron–phonon couplings,which gives rise to an unusual scenario of interaction-triggered phonon instabilities,and eventually yields a charge density wave(CDW)*** further show that,in the CDW phase,the ground-state current density distribution exhibits an intriguing star-of-David pattern,leading to flux density *** orbital fluxes(or current loops)in this system emerge as a result of the subtle interplay between magnetism,lattice geometries,charge order,and spin-orbit coupling(SOC),which can be described by a simple,yet universal,tight-binding theory including a Kane-mele-type SOC term and a magnetic exchange *** further study the origin of the peculiar step-edge states in FeGe,which sheds light on the topological properties and correlation effects in this new type of kagome antiferromagnetic material.

关键词： interaction phonon orbital

Tuning structural,electrical,dielectric and magnetic properties of mg-Cu-Co ferrites via dysprosium(Dy^(3+))doping

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Journal of Rare Earths 2024年第1期42卷 137-146,I0005页

作者： maria Akhtar m.S.hasan Nasir Amin N.A.morley muhammad Imran Arshad Department of Physics Government College UniversityFaisalabad38000Pakistan Department of Physics The University of Lahore53700Pakistan Department of materials Science and Engineering The University of SheffieldS13JDUK Department of Physics&Astronomy University College LondonUK

In current research work,Dy3+substituted mg0.5Cu0.25Co0.25Fe2-xDyxO4(0.0≤x≤0.04 with the step interval of 0.01)soft ferrites were synthesized by the sol-gel auto combustion *** prepared samples were characterized by the techniques using X-ray diffraction(XRD),scanning electron microscopy(SEm),energy dispersive X-ray spectroscopy(EDS),Fourier transform infrared(FTIR)spectroscopy,curre nt-voltage(Ⅰ-Ⅴ)measurement,LCR meter,vibrating sample magnetometer(VSm)and *** data reveal that the average crystallite size is 49.71 nm and the lattice constant is 0.83703 nm for sample x=*** non-uniform grain growth was demonstrated by micrographs and impurity-free elemental composition was observed from EDX *** DC resistivity has an increasing and decreasing trend in ferromagnetic and paramagnetic regions with an increase in ***,the high resistivity is observed with the order of 1010Ω·cm,and the activation energy is 0.944 eV for samples x=*** dielectric parameters including dielectric constant,dielectric losses,and impedance gradually decrease with the increase in frequency from 8 Hz to 8 *** minimum dielectric loss at high frequency is found for sample x=*** coercivity(Hc)and saturation magnetization(ms)are found in the ranges of 520.82-544.02 Oe and 20.5841-21.1473 emu/g,*** observations confirm that dysprosium(x=0.03)doped mCC-soft ferrites may be applicable in transformer cores,microwave absorbance,and telecommunication devices.

关键词： Soft ferrites DC resistivity Dielectric loss Impedance Coercivity Rare earths

Pediatric and adult liver transplantation in Bahrain: The experiences in a country with no available liver transplant facilities

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World Journal of Transplantation 2024年第1期14卷 96-111页

作者： hasan m Isa Fatema A Alkharsi Jawad K Khamis Sawsan A hasan Zainab A Naser Zainab N mohamed Afaf m mohamed Shaikha A Altamimi Department of Pediatrics Salmaniya Medical ComplexManama 26671Bahrain Department of Pediatrics Arabian Gulf UniversityManama 26671Bahrain Department of medicine Salmaniya Medical ComplexManama 26671Bahrain Public Health Directorate Ministry of HealthManama 26671Bahrain The Overseas Office Supreme Committee for Treatment AbroadMinistry of HealthManama 26671Bahrain

BACKGROUND Liver transplantation(LT)is a life-saving procedure for patients with end-stage liver disease and has become the standard and most effective treatment method for these *** are many indications for LT that vary between countries and *** outcome of LT depends on the available facilities and surgical expertise,as well as the types of liver graft donors *** To assess the clinical characteristics of patients from Bahrain who underwent LT overseas,and analyze factors affecting their *** In this retrospective cohort study,we reviewed the medical records and overseas committee registry information of all pediatric and adult patients who were sent overseas to undergo LT by the Pediatric and medical Departments of Salmaniya medical Complex and Bahrain Defence Force Hospital via the Overseas Treatment Office,ministry of Health,Kingdom of Bahrain,between 1997 and *** data,LT indication,donor-recipient relationship,overseas LT center,graft type,post-LT medications,and LT complications,were *** measured included the overall and 5-year LT survival ***’s exact,Pearsonχ2,and mann-Whitney U tests were used to compare the pediatric and the adults’group in terms of clinical characteristics,donor-recipient relationship,medication,complications,and *** analysis was estimated via the Kaplan-meier’s *** and multivariate analyses were used to detect predictors of *** Of the 208 eligible patients,170(81.7%)were sent overseas to undergo LT while 38(18.3%)remained on the waiting *** the 170 patients,167(80.3%)underwent LT and were included in the *** majority of the patients were Bahraini(91.0%),and most were males(57.5%).One-hundred-and-twenty(71.8%)were adults and 47(28.3%)were *** median age at transplant was 50.0[interquartile range(IQR):14.9–58.4]*** main indication for pediatric LT was biliary atresia(31.9%),while that of adult LT was

关键词： Overseas liver transplantation End-stage liver disease Liver transplant facilities Liver donor Biliary atresia Hepatitis C