Search

Your search keyword '"Alharthi, Fahad A."' showing total 605 results
Start Over Author "Alharthi, Fahad A."
605 results on '"Alharthi, Fahad A."'

1. Radiation in oriented crystals: Innovative application to future positron sources

Author

Soldani, Mattia, Alharthi, Fahad, Bandiera, Laura, Canale, Nicola, Cavoto, Gianluca, Chaikovska, Iryna, Chehab, Robert, Guidi, Vincenzo, Haurylavets, Viktar, Mazzolari, Andrea, Negrello, Riccardo, Paternò, Gianfranco, Romagnoni, Marco, Sytov, Alexei, and Tikhomirov, Victor

Subjects
Physics - Accelerator Physics, High Energy Physics - Experiment
Abstract

It has been known since decades that the alignment of a beam of high-energy electrons with particular crystal directions involves a significant increase of bremsstrahlung radiation emission. This enhancement lies at the conceptual foundation of innovative positron source schemes for future lepton colliders. In particular, the so-called hybrid scheme makes use of a heavy-metal radiator in crystalline form, which is then followed by an amorphous metallic converter for positron generation from electrons by means of a two-step electromagnetic process. This work presents the most recent simulation results obtained on the development of a hybrid positron source for the FCC-$ee$ from the standpoint of the features of both the crystalline radiator and the amorphous converter.

Published
2024
Full Text
View/download PDF

14. Modulation of inflammatory, oxidative, and apoptotic stresses mediates the renoprotective effect of daidzein against glycerol-induced acute kidney injury in rats

Author

Kassab, Rami B., Elhenawy, Ahmed A., AbdulrahmanTheyab, Hawsawi, Yousef M., Al-Amer, Osama M., Oyouni, Atif Abdulwahab A., Habotta, Ola A., Althagafi, Hussam A., Alharthi, Fahad, Lokman, Maha S., Alsharif, Khalaf F., Albrakati, Ashraf, Al-Ghamdy, Ali O., Elmahallawy, Ehab Kotb, Elhefny, Mohamed A., Hassan, Kalid E., Albarakati, Alaa Jameel A., Abdel Moneim, Ahmed E., and Moustafa, Ahmed A.

Published
2023
Full Text
View/download PDF

18. Theoretical investigations on the Adiabatic Matching Device-based positron capture system

Author

Bulyak, Eugene, Mytrochenko, Viktor, Chaikovska, Iryna, Kubytskyi, Viacheslav, Chehab, Robert, and Alharthi, Fahad

Subjects
Physics - Accelerator Physics
Abstract

The positrons produced with the electron beam impinging on a conversion target, possess wide energy spectrum and large sweep of the angle of trajectories to the system axis. Accommodation of the positron bunch to the acceptance of an ajacent accelerator, mandates the reduction of angular spread. One of the most appropriate devices for transforming the phase portrait of a positron bunch is Adiabatic Matching Device (AMD). The paper presents an abridge theory of AMD. It is shown that the transformation of the transverse phase phase volume aimed at decrease the angular spread causes prolonging the bunch. Both the longitudinal and the transversal probability density functions are derived. The analytical results are validated with numerical simulations., Comment: 6 pages, 7 figures

Published
2022

27. Silver Nanoparticles Enhance Oxidative Stress, Inflammation, and Apoptosis in Liver and Kidney Tissues: Potential Protective Role of Thymoquinone

Author

Salama, Basma, Alzahrani, Khalid J., Alghamdi, Khalid S., Al-Amer, Osama, Hassan, Khalid E., Elhefny, Mohamed A., Albarakati, Alaa Jameel A., Alharthi, Fahad, Althagafi, Hussam A., Al Sberi, Hassan, Amin, Hatem K., Lokman, Maha S., Alsharif, Khalaf F., Albrakati, Ashraf, Abdel Moneim, Ahmed E., Kassab, Rami B., and Fathalla, Ayah S.

Published
2023
Full Text
View/download PDF

28. Enhanced visible-light-driven photocatalytic degradation of azo dyes by heteroatom-doped nickel tungstate nanoparticles

Author

Alharthi Fahad A., Albaeejan Mohammed Abdullah, Alshayiqi Alanoud Abdullah, Aldubeikl Hend Khalid, and Hasan Imran

Subjects
semiconductor photocatalysis, nanocomposites, hydrothermal synthesis, monoclinic structure, photoabsorption, Technology, Chemical technology, TP1-1185, Physical and theoretical chemistry, QD450-801
Abstract

In this study, we conducted the hydrothermal synthesis of cobalt (Co)–doped NiWO4, resulting in the formation of Co–NiWO4 nanoparticles (NPs), followed by calcination at 550℃ for 12 h. Comprehensive analyses were performed to characterize the composition, structure, and morphology of the synthesized material. X-ray diffraction results confirmed the successful inclusion of Co in the NiWO4 lattice, with the presence of characteristic peaks of CoWO4. The crystallite size, determined using the Scherrer equation, was measured to be 22 nm. Using UV-Vis spectroscopy and Tauc’s equation, we calculated the band gap energy (E g) to be 3.75 eV for NiWO4 and 1.75 eV for Co–NiWO4. The potential application of the synthesized material as a photocatalyst was investigated for the degradation of the diazo dye Congo red (CR). Under optimized reaction conditions, Co–NiWO4 NPs demonstrated outstanding efficiency, degrading a total of 95% of CR. The degradation kinetics were well-described by the Langmuir–Hinshelwood (L–H) kinetic model, indicating that photoabsorption played a crucial role in the rate-controlling step. These encouraging results suggest that Co–NiWO4 NPs hold promise as a viable option for addressing other pollutants in various applications.

Published
2023
Full Text
View/download PDF

29. Protective effect of quercetin against 5-fluorouracil-induced cardiac impairments through activating Nrf2 and inhibiting NF-κB and caspase-3 activities

Author

Lokman, Maha S., Althagafi, Hussam A., Alharthi, Fahad, Habotta, Ola A., Hassan, Arwa A., Elhefny, Mohamed A., Al Sberi, Hassan, Theyab, Abdulrahman, Mufti, Ahmad Hasan, Alhazmi, Alaa, Hawsawi, Yousef M., Khafaga, Asmaa F., Gewaily, Mahmoud S., Alsharif, Khalaf F., Albrakati, Ashraf, and Kassab, Rami B.

Published
2023
Full Text
View/download PDF

36. Retraction notice to “Promoting the photocatalytic reduction of CO2 and dye degradation via multi metallic Smx modified CuCo2O4 reverse spinel hybrid catalyst” [Ceram. Int. 49 (2023) 1742–1755]

Author

Adimule, Vinayak, primary, Yallur, Basappa C., additional, Batakurki, Sheetal, additional, Bathula, Chinna, additional, Nabgan, Walid, additional, Alharthi, Fahad A., additional, Jeon, Byong-Hun, additional, Akshatha, S., additional, and Parashuram, L., additional

Published
2024
Full Text
View/download PDF

37. The functional characterisation of potential oncogenic roles of the human germ line genes PRDM9 and TEX19

Author

Alharthi, Fahad and Mcfarlane, Ramsay

Subjects
616.99, cancer/testes antigen genes, genetics, PRDM9, TEZ19, epigenetics, molecular biology
Abstract

Cancer cells acquire a number of abnormal epigenetic and/or genetic properties. These enable cancer cells to grow, spread and escape the action of therapeutic and immunologic targeting. An important feature of many cancers is the re-activation of a set of genes which are normally expressed during distinct development stages. These genes include the germline genes. Cancer Testis Antigen (CTA) genes are normally expressed in male germ cells in the adult testes and variety of cancer cells. Understanding this group of genes has great significance in cancer biology. This research is aimed at investigation of the functions of two germ specific CTA genes, namely PRDM9 and TEX19, both of which are activated in several kinds of tumours. PRDM9 has histone methyltransferase activity to coordinate meiotic recombination hotspot activation. Activity the murine orthologue of human PRDM9, Meisetz, has been described as a meiotic recombination activator which is also involved in regulation of transcription for other meiosis specific genes. This current research indicates that PRDM9 can affect cancer cell proliferation and may transcriptionally regulate other germline genes in cancer cells. TEX19 functions in the germ line to mediate an array of process. TEX19 has recently been demonstrated to be an oncogenic driver with potential role in self-renewal and proliferation of cancer cells. This current research confirmed that TEX19 depletion affects proliferation of cancer cells. Also, it was found that siRNA depletion of TEX19 caused considerable decrease in histone H3K9Ac, showing a potential contribution of TEX19 to epigenetic regulation of chromatin and / or chromosomal dynamics. Finally, we found that TEX19 might control L1-ORF1p, which is a protein encoded by LINE-1 that is needed for retro-transposition. This feature shows both commonalties and distinctions to the reported activities of murine Tex19.1. This might reflect fundamental species differences, or specific TEX19 functions in cancer cells. We put forward a model in which we propose TEX19 functions in oncogenesis as a nucleic acid mimetic.

Published
2020

Catalog

Books, media, physical & digital resources
See catalog results