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1,255 results on '"Alharbi, Khalid"'

3. Production Radio-Chromic Films Dosimeter for Low and High Irradiation Dose Application

Author

Alsuhybani, Mohammed S., Albarqi, Mubarak M., Alsulami, Raed A., Alqahtani, Sarah H., Alharbi, Khalid N., Alotaibi, Mohammed F., Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Tolio, Tullio A. M., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Schmitt, Robert, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Shams, Afaque, editor, Al-Athel, Khaled, editor, Tiselj, Iztok, editor, Pautz, Andreas, editor, and Kwiatkowski, Tomasz, editor

Published
2024
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12. Synthesis of new high-pressure A-site manganite perovskites and investigation of their magnetic properties

Author

Alharbi, Khalid Naif F., Attfield, John, and Robertson, Neil

Subjects
HPHT, perovskite oxide materials, powder X-ray diffraction, neutron powder diffraction, Quantum Design Magnetic Property Measurement System
Abstract

Perovskites, with the general formula, ABO3, have been extensively studied due to their large variety of intriguing electronic and magnetic properties, which can be achieved via a number of possible chemical compositions. The use of A and B site cations of various sizes and charges induce cation order, giving rise to A2BB'O6 and AA'B2O6 double perovskites (DPv), while, the combination of cation order into both sublattices in an AA'BB'O6 double double perovskite (DDPv) is uncommon. However, the well-known DDPv arrangement in A and B-sites is a layered arrangement of A and A', which coexists with the rock-salt motif of B and B'. The A-site is usually occupied by a large cation with 12-fold coordination, but it can host smaller cations comparable in size to B-site cations as it becomes distorted (e.g. larger tilt angles). The smaller the ionic radius of A, the higher the distortion, and higher pressure is required to stabilise the structure. Employing the formula A= Mn2+ demonstrates some significant structural features and magnetic properties. An attempt has been made to synthesise new DPv and DDPv materials, which contain Mn2+, into the A-site to enhance the physical properties of the material. Three different compounds were successfully synthesised: Mn2NiReO6, CaMnCrSbO6 and CaMnMnWO6. Firstly, Mn2NiReO6 is a new member of the ´all transition metal' (ATM) double perovskite family and is obtained under high pressure (8 GPa) and high temperature (1573 K) conditions. The crystal structure was confirmed by PXRD and NPD, with monoclinic P21/n symmetry, which shows fully ordered Ni2+ and Re6+ within the octahedral sites in a rock-salt motif and a large distortion, with the greatest tilt angles observed to date, in A-site manganite double perovskite oxides. Magnetic structure refinement indicates that all moments are ordered antiferromagnetically below TM1 = 80 K. However, the unusual continuous spin rotation of Mn spins occur down to a second transition (TM2 = 42 K). This effect has not been reported in any of the previous Mn2BB'O6 compounds. Secondly, CaMnCrSbO6 was synthesised under high pressure (10 GPa) and high temperature (1373 K) conditions. The compound crystallises via PXRD and NPD with a DDPv structure, which combines columnar order in the A-site cations (Ca and Mn) and rock-salt order of the B-site cations (Cr and Sb). The Mn in the A and A` sites show alternating square planar and tetrahedral coordination. CaMnCrSbO6 has a single magnetic transition at 49 K, where Mn2+ and Cr3+ spin order into antiparallel FM sublattices. Finally, CaMnMnWO6 crystallises via PXRD and NPD at 10 GPa with the monoclinic P21/n space group in a DPv structure with rock-salt order of the B sites at a high temperature (1573 K). While at a lower temperature (1273 K), a DDPv structure with the P42/n space group is observed with A-site cations ordered in the columnar order and B-site cations in the rock salt environment. The magnetic refinement reveals a spin glass behaviour for the DPv structure, whereas, the DDPv magnetic structure shows antiferromagnetic coupling between ferromagnetic sublattices at TC = 45 K.

Published
2022
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21. Computational Empathy Using Facial Emotion Recognition: An Update

Author

Alharbi, Khalid, Semwal, Sudhanshu, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, and Arai, Kohei, editor

Published
2023
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34. Microbiome in Asthma

Author

Alharbi, Khalid Saad, Alenezi, Sattam Khulaif, Alnasser, Sulaiman Mohammed, Gupta, Gaurav, editor, Oliver, Brian G., editor, Dua, Kamal, editor, Singh, Alisha, editor, and MacLoughlin, Ronan, editor

Published
2022
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46. Sodium alginate based drug delivery in management of breast cancer

Author

Shaikh, Mohammad Arshad Javed, Alharbi, Khalid Saad, Almalki, Waleed Hassan, Imam, Syed Sarim, Albratty, Mohammed, Meraya, Abdulkarim M., Alzarea, Sami I., Kazmi, Imran, Al-Abbasi, Fahad A., Afzal, Obaid, Altamimi, Abdulmalik Saleh Alfawaz, Singh, Yogendra, Singh, Sachin Kumar, Dua, Kamal, and Gupta, Gaurav

Published
2022
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48. Fractional simulations for thermal flow of hybrid nanofluid with aluminum oxide and titanium oxide nanoparticles with water and blood base fluids

Author

Khan Muhammad Ijaz, Mansir Ibrahim B., Raza Ali, Khan Sami Ullah, Elattar Samia, Said Hanaa Mohamed, Tlili Iskander, Alharbi Khalid Abdulkhaliq M., and Galal Ahmed M.

Subjects
fractional derivatives, hybrid nanofluid, caputo fractional model, mittag–leffler function, Technology, Chemical technology, TP1-1185, Physical and theoretical chemistry, QD450-801
Abstract

The fractional model has been developed for the thermal flow of hybrid nanofluid due to the inclined surface. The thermal investigation of the hybrid nanomaterial is predicted by utilizing the molybdenum disulphide nanoparticles and graphene oxide nanomaterials. The flow computations for mixed convection flow of nanoparticles and base fluids are performed due to vertical oscillating plate. The simulations for the formulated model have been done ρ-Laplace transform technique for Caputo fractional simulations. Definitions of Mittage–Leffler function and ρ-Laplace transform are also presented for the governing model. The application of updated definitions of ρ-Laplace transform for the Caputo fractional model is quite interesting unlike traditional Laplace transforms. The comparative investigation for both types of nanoparticles is performed for heat and mass transfer rates. It is observed that the heat enhancement rate due to water-based nanoparticles is relatively impressive compared to the kerosene oil-based nanomaterials.

Published
2022
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49. Combined impact of Marangoni convection and thermophoretic particle deposition on chemically reactive transport of nanofluid flow over a stretching surface

Author

Madhukesh Javali Kotresh, Mansir Ibrahim B., Prasannakumara Ballajja Chandrappa, Khan Muhammad Ijaz, Alharbi Khalid Abdulkhaliq M., Abdelrahman Anas, Khan Muhammad, Ramesh Gosikere Kenchappa, and El-Sayed Ahmed Ahmed

Subjects
nanofluid, uniform heat source/sink, stretching sheet, marangoni convection, thermophoretic particle deposition, Technology, Chemical technology, TP1-1185, Physical and theoretical chemistry, QD450-801
Abstract

The impact of Marangoni convection has noteworthy applications in nanotechnology, atomic reactor, silicon wafers, semiconductor processing, soap films, materials sciences, thin-film stretching, crystal growth, and melting and welding processes. On the other hand, thermophoretic particle deposition (TPD) has a significant application in building ventilation systems, crushed coal burners, thermal exchangers, and air cleaners. Inspired by these applications, the present work mainly concentrates on the Marangoni convection flow of Al2O3/water-based nanofluid over a stretching sheet in a porous medium with TPD in the presence of Newtonian heating. Additionally, heat absorption/generation in energy expression is considered. A suitable similarity variable is applied to simplify the partial differential equations into a set of ordinary differential equations (ODEs). Furthermore, Runge Kutta Fehlberg fourth fifth order method along with the shooting technique is implemented to solve the reduced ODEs. Furthermore, mathematical computational software helps to acquire a numerical solution. The velocity of nanofluid increases for enhancement of Marangoni number and diminishes for porosity parameter. The heat absorption/generation parameter improves thermal dispersion in both common wall temperature and Newtonian heating cases. For the upgradation in the thermophoretic parameter, the concentration decreases and the rate of mass transfer increases. The rate of heat transfer increases as the heat source parameter grows and decreases as the heat sink parameter decreases. In all of the profiles, nanofluid outperforms viscous fluid.

Published
2022
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