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Exploring physical properties of compact stars in f(R,T)-gravity:An embedding approach

Chinese Physics C 2020年第10期44卷 190-204页

作者： Ksh.Newton Singh Abdelghani Errehymy Farook Rahaman Mohammed daoud Department of Physics National Defence AcademyKhadakwaslaPune-411023India Department of Mathematics Jadavpur UniversityKolkata-700032India Laboratory of High Energy Physics and Condensed Matter(LPHEMaC) Department of PhysicsFaculty of Sciences Aïn ChockUniversity of Hassan IIB.P.5366 MaarifCasablanca 20100Morocco Department of Physics Faculty of SciencesUniversity of Ibn TofailB.P.133Kenitra 14000Morocco Abdus Salam International Centre for Theoretical Physics MiramareTrieste 34151Italy

Solving field equations exactly in f(R,T)−gravity is a challenging *** do so,many authors have adopted different methods such as assuming both the metric functions and an equation of state(EoS)and a metric ***,such methods may not always lead to well-behaved solutions,and the solutions may even be rejected after complete ***,very recent studies on embedding class-one methods suggest that the chances of arriving at a well-behaved solution are very high,which is *** the class-one approach,one of the metric potentials is estimated and the other can be obtained using the Karmarkar *** this study,a new class-one solution is proposed that is well-behaved from all physical points of *** nature of the solution is analyzed by tuning the f(R,T)−coupling parameterχ,and it is found that the solution leads to a stiffer EoS forχ=−1 than that forχ=*** is because for small values ofχ,the velocity of sound is higher,leading to higher values of Mmax in the M−R curve and the EoS parameterω.The solution satisfies the causality condition and energy conditions and remains stable and static under radial perturbations(static stability criterion)and in equilibrium(modified TOV equation).The resulting M−R diagram is well-fitted with observed values from a few compact stars such as PSR J1614-2230,Vela X-1,Cen X-3,and SAX ***,for different values ofχ,the corresponding radii and their respective moments of inertia have been predicted from the M−I curve.

关键词： f(R,T)-gravity Karmarkar's condition exact solutions compact star

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Recent advances in myeloid-derived suppressor cell biology

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Frontiers of Medicine 2021年第2期15卷 232-251页

作者： Mahmoud Mohammad Yaseen Nizar Mohammad Abuharfeil Homa Darmani Ammar daoud Department of Biotechnology and Genetic Engineering Department of Applied Biology Faculty of Science and Arts Department of Internal Medicine Faculty of MedicineJordan University of Science and TechnologyIrbid 22110Jordan

In recent years,studying the role of myeloid-derived suppressor cells(MDSCs)in many pathological inflammatory conditions has become a very active research *** the role of MDSCs in cancer is relatively well established,their role in non-cancerous pathological conditions remains in its infancy resulting in much *** objectives in this review are to address some recent advances in MDSC research in order to minimize such confusion and to provide an insight into their function in the context of other *** following topics will be specifically focused upon:(1)definition and characterization of MDSCs;(2)whether all MDSC populations consist of immature cells;(3)technical issues in MDSC isolation,estimation and characterization;(4)the origin of MDSCs and their anatomical distribution in health and disease;(5)mediators of MDSC expansion and accumulation;(6)factors that determine the expansion of one MDSC population over the other;(7)the Yin and Yang roles of ***,the functions of MDSCs will be addressed throughout the text.

关键词： non-human primates(rhesus macaques) myeloid-derived pro-inflammatory cells(MDPCs) autoimmune disorders alloimmune responses pregnancy mature MDSCs multiple sclerosis Yin-Yang law of MDSCs

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Role of hepatocyte nuclear factor 4-alpha in gastrointestinal and liver diseases

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World Journal of Gastroenterology 2019年第30期25卷 4074-4091页

作者： Matthew M Yeh Dustin E Bosch Sayed S daoud Department of Pathology University of Washington School of MedicineSeattleWA 98195United States Department of Medicine University of Washington School of MedicineSeattleWA 98195United States Department of Pharmaceutical Sciences Washington State University Health SciencesSpokaneWA 99210United States

Hepatocyte nuclear factor 4-alpha(HNF4α)is a highly conserved member of nuclear receptor superfamily of ligand-dependent transcription factors that is expressed in liver and gastrointestinal organs(pancreas,stomach,and intestine).In liver,HNF4αis best known for its role as a master regulator of liver-specific gene expression and essential for adult and fetal liver *** of HNF4αexpression has been associated with many human diseases such as ulcerative colitis,colon cancer,maturity-onset diabetes of the young,liver cirrhosis,and hepatocellular ***,the precise role of HNF4αin the etiology of these human pathogenesis is not well *** information is known about the role of HNF4αisoforms in liver and gastrointestinal disease *** is,therefore,a critical need to know how disruption of the expression of these isoforms may impact on disease progression and *** this review,we will update our current understanding on the role of HNF4αin human liver and gastrointestinal *** further provide additional information on possible use of HNF4αas a target for potential therapeutic approaches.

关键词： Hepatocyte nuclear factor 4-alpha Liver cirrhosis Hepatocellular carcinoma Viral hepatitis Gastrointestinal tract Colorectal carcinoma Transcription factor

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Detection of oxidative stress and DNA damage in freshwater snail Lymnea leuteola exposed to profenofos

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Frontiers of Environmental Science & Engineering 2018年第5期12卷 181-187页

作者： daoud Ali Huma Ali Saud Alifiri Saad Alkahtani Abdullah A Alkahtane Shaik Althaf Huasain Department of Zoology College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia 2 Department of ChemistryMANITBhopal 462003India

Extensive production and use of organophosphate pesticide in agriculture,has risen concerned about its ecotoxicity and risk assessment of insecticides,which are more ***,the present investigation was aimed to study the induction of oxidative stress and DNA damage by organophosphate insecticide profenofos(PFF)in freshwater snail Lymnea luteola(***).The median lethal value(96 h LC50)of PFF was estimated as 1.26 mg/L for *** in a semi-static system and on the basis of LC50 value three concentrations viz.,0.126(1/10 of LC50,Sublethal I),0.63(1/2 of LC50,Sublethal II)and 0.84 mg/L(2/3 of LC50,Sublethal III)were *** were exposed to above-mentioned concentrations of PFF along with solvent control(acetone)and negative control for 96 *** haemolymph was collected at 24 and 96 h of after *** heamolymph of PFF exposed snail,lipid peroxide,glutathione reduced glutathione S transferase and superoxide dismutase activities at the tested concentrations significantly differ from those in the *** genotoxicity induced in hemocytes of treated snails was measured by alkaline single cell gel electrophoresis *** data of this experiment demonstrated significantly enhancement of oxidative stress and DNA damage in the treated snails as compared to ***,we observed statistically significant correlations of ROS with DNA damage(%tail DNA)(R^(2)=0.9708)for 24 h and DNA damage(R^(2)=0.9665)for 96 *** of the current experiment can be useful in risk evaluation of PFF among aquatic *** study confirmed the use of comet assay for in vivo laboratory experiments using freshwater snail for selecting the toxic potential of industrial chemicals and environmental contaminants.

关键词： Acute toxicity Profenofos ROS oxidative stress DNA damage Lymnea luteola

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A Solvation Model for Performance Enhancement of Dye-Sensitized Solar Cells

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Fluid Dynamics & Materials Processing 2022年第6期18卷 1569-1579页

作者： Adel daoud Ali Cheknane Jean Michel Nunzi Afak Meftah Laboratoire des Matériaux Semi-Conducteurs et Métalliques(LMSM) Universitéde BiskraBiskraAlgeria Laboratoire des Semi-Conducteurs et Matériaux Fonctionnels(LSMF) UniversitéAmar Telidji de LaghouatLaghouatAlgérie Department of Chemistry Queen’s UniversityKingstonCanada Department of Engineering Physics and Astronomy Queen’s UniversityKingstonCanada

A solubility model for Merocyanine-540 dye together with the interface’s electron transfer kinetics of MC-540/TiO2 has been investigated(Merocyanine 540-based dye has been used effectively in dye-sensitized solar cells).The highest absorption peaks were recorded at 489 nm and 493 nm in Water and Ethanol solvent,*** vacuum phase which yielded 495 nm(associated with a modest electron injection-free energy value(Ginj)of−2.34 eV for both Water and Ethanol solvents).The time-dependent density functional theory(TD-DFT)method approach has been applied in this ***,the electronic structure and simulated UV-Vis spectra of the dye in different solvents have been determined,and the alignment with the solar spectrum has been discussed to a certain *** energy level diagrams and electron density of the primary molecular orbitals are shown,and the major issues that have an impact on our new interface’s performance are *** is concluded that the proposed Solvation Model(SM)can improve the performance of Dye-Sensitized Solar Cells.

关键词： Mc-540-based dye DFT method electron injection n-DSSCs

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A Computational Analysis to Burgers Huxley Equation

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Computers, Materials & Continua 2021年第5期67卷 2161-2183页

作者： Muhammad Saqib Muhammad Shoaib Arif Shahid Hasnain daoud S.Mashat Department of Mathematics Numl UniversityIslamabad44000Pakistan Department of Mathematics Air UniversityIslamabad44000Pakistan Department of Mathematics Air UniversityMultan CampusMultan66000Pakistan Department of Mathematics King Abdulaziz UniversityJeddahSaudi Arabia

The efficiency of solving computationally partial differential equations can be profoundly highlighted by the creation of precise,higher-order compact numerical scheme that results in truly outstanding accuracy at a given *** objective of this article is to develop a highly accurate novel algorithm for two dimensional non-linear Burgers Huxley(BH)*** proposed compact numerical scheme is found to be free of superiors approximate oscillations across discontinuities,and in a smooth ow region,it efciently obtained a high-order *** particular,two classes of higherorder compact nite difference schemes are taken into account and compared based on their computational *** stability and accuracy show that the schemes are unconditionally stable and accurate up to a two-order in time and to six-order in ***,algorithms and data tables illustrate the scheme efciency and decisiveness for solving such non-linear coupled *** is scaled in terms of L_(2) and L_(∞) norms,which validate the approximated results with the corresponding analytical *** investigation of the stability requirements of the implicit method applied in the algorithm was carried *** agreement was constructed under indistinguishable computational *** proposed methods can be implemented for real-world problems,originating in engineering and science.

关键词： Burgers Huxley equation nite difference schemes HOC schemes Thomas algorithm Von-Neumann stability ana

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Stability Analysis of Predator-Prey System with Consuming Resource and Disease in Predator Species

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Computer Modeling in Engineering & Sciences 2022年第8期132卷 489-506页

作者： Asad Ejaz Yasir Nawaz Muhammad Shoaib Arif daoud S.Mashat Kamaleldin Abodayeh Department of Mathematics Air UniversityPAF Complex E-9Islamabad44000Pakistan Department of Mathematics King Abdulaziz UniversityJeddah22254Saudi Arabia Department of Mathematics and Sciences College of Humanities and SciencesPrince Sultan UniversityRiyadh11586Saudi Arabia

The present study is concerned with formulating a predator-prey eco-epidemiological mathematical model assuming that an infection exists in the predator *** two classes of predator species(susceptible and infected)compete for the same sources available in the environment with the predation *** is assumed that the disease does not spread *** proposed model is analyzed for the stability of the coexistence of the predators and *** fixed points are carried out,and the coexisting fixed point is studied in detail by constructing the Lyapunov *** movement of species in search of food or protection in their habitat has a significant influence,examined through *** ecological influences of self-diffusion on the population density of both species are *** is theoretically proved that all the under consideration species can coexist in the same *** coexistence fixed point is discussed for both diffusive and non-diffusive ***,a numerical scheme is constructed for solving time-dependent partial differential *** stability of the scheme is given,and it is applied for solving presently modified eco-epidemiological mathematical model with and without *** comparison of the constructed scheme with two exiting schemes,Backward in Time and Central in Space(BTCS)and Crank Nicolson,is also given in the form of ***,we run a computer simulation to determine the effectiveness of the proposed numerical *** readers’convenience,a computational code for the proposed discrete model scheme may be made available upon request.

关键词： Eco-epidemiology self-diffusion stability Lyapunov function proposed numerical scheme

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Synergistic Swarm Optimization Algorithm

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Computer Modeling in Engineering & Sciences 2024年第6期139卷 2557-2604页

作者： Sharaf Alzoubi Laith Abualigah Mohamed Sharaf Mohammad Sh.daoud Nima Khodadadi Heming Jia Faculty of Computer Sciences and Informatics Amman Arab UniversityAmman11953Jordan Computer Science Department Al Al-Bayt UniversityMafraq25113Jordan Department of Electrical and Computer Engineering Lebanese American UniversityByblos13-5053Lebanon Hourani Center for Applied Scientific Research Al-Ahliyya Amman UniversityAmman19328Jordan MEU Research Unit Middle East UniversityAmman11831Jordan Applied Science Research Center Applied Science Private UniversityAmman11931Jordan School of Computer Sciences Universiti Sains MalaysiaPulau Pinang11800Malaysia School of Engineering and Technology Sunway University MalaysiaPetaling Jaya27500Malaysia Department of Industrial Engineering College of EngineeringKing Saud UniversityP.O.Box 800Riyadh11421Saudi Arabia College of Engineering Al Ain UniversityAbu Dhabi112612United Arab Emirates Department of Civil and Architectural Engineering University of MiamiCoral Gables1251USA School of Information Engineering Sanming UniversitySanming365004China

This research paper presents a novel optimization method called the Synergistic Swarm Optimization Algorithm(SSOA).The SSOA combines the principles of swarmintelligence and synergistic cooperation to search for optimal solutions efficiently.A synergistic cooperation mechanism is employed,where particles exchange information and learn from each other to improve their search *** cooperation enhances the exploitation of promising regions in the search space while maintaining exploration ***,adaptive mechanisms,such as dynamic parameter adjustment and diversification strategies,are incorporated to balance exploration and *** leveraging the collaborative nature of swarm intelligence and integrating synergistic cooperation,the SSOAmethod aims to achieve superior convergence speed and solution quality performance compared to other optimization *** effectiveness of the proposed SSOA is investigated in solving the 23 benchmark functions and various engineering design *** experimental results highlight the effectiveness and potential of the SSOA method in addressing challenging optimization problems,making it a promising tool for a wide range of applications in engineering and *** codes of SSOA are available at:https://***/matlabcentral/fileexchange/153466-synergistic-swarm-optimization-algorithm.

关键词： Synergistic swarm optimization algorithm optimization algorithm metaheuristic engineering problems benchmark functions

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Comparing outcomes for endoscopic submucosal dissection between Eastern and Western countries:A systematic review and meta-analysis

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World Journal of Gastroenterology 2018年第23期24卷 2518-2536页

作者： Dane Christina daoud Nicolas Suter Madeleine Durand Mickael Bouin Bernard Faulques Daniel von Renteln Department of Medicine Division of GastroenterologyCentre Hospitalier de l’Université de Montréal (CHUM) and Centre de Recherche du Centre hospitalier de l’ Université de Montréal (CRCHUM) Department of Medicine Division of Internal MedicineCentre Hospitalier de l’Université de Montréal (CHUM) and Centre de Recherche du Centre hospitalier de l’Université de Montréal (CRCHUM)

AIM To compare endoscopic submucosal dissection(ESD) outcomes between Eastern and Western *** A systematic review and meta-analysis was performed using Pub Med,MEDLINE,Web of Science,CINAHL and EBM reviews to identify studies published between 1990 and February 2016. The primary outcome was the efficacy of ESD based on information about either curative resection,en bloc or R0 resection rates. Secondary outcomes were complication rates,local recurrence rates and procedure times. RESULTS Overall,238 publications including 84318 patients and 89512 gastrointestinal lesions resected using ESD were identified. 90% of the identified studies reporting ESDon 87296 lesions were conducted in Eastern countries and 10% of the identified studies reporting ESD outcomes in 2216 lesions were from Western countries. Meta-analyses showed higher pooled percentage of curative,en bloc,and R0 resection in the Eastern studies; 82%(CI: 81%-84%),95%(CI: 94%-96%) and 89%(CI: 88%-91%) compared to Western studies; 71%(CI: 61%-81%),85%(CI: 81%-89%) and 74%(CI: 67%-81%) respectively. The percentage of perforation requiring surgery was significantly greater in the Western countries(0.53%; CI: 0.10-1.16) compared to Eastern countries(0.01%; CI: 0%-0.05%). ESD procedure times were longer in Western countries(110 min vs 77 min).CONCLUSION Eastern countries show better ESD outcomes compared to Western countries. Availability of local ESD expertise and regional outcomes should be considered for decision making to treat gastrointestinal lesions with ESD.

关键词： curative resection en bloc resection R0 resection perforation

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Hard Decision-Based PWM for MIMO-OFDM Radar

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Communications and Network 2015年第1期7卷 30-42页

作者： Omar daoud Communications and Electronics Engineering Department Philadelphia University Amman Jordan

For the purpose of target localization, Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) radar has been proposed. OFDM technique has been adopted in order to a simultaneous transmission and reception of a set of multiple narrowband orthogonal signals at orthogonal frequencies. Although multi-carrier systems such as OFDM support high data rate applications, they do not only require linear amplification but also they complicate the power amplifiers design and increase power consumption. This is because of high peak-to-average power ratio (PAPR). In this work, a new proposition has been made based on the Pulse Width Modulation (PWM) to enhance the MIMO-OFDM radar systems’ performance. In order to check the proposed systems performance and its validity, a numerical analysis and a MATLAB simulation have been conducted. Nevertheless of the system characteristics and under same bandwidth occupancy and system’s specifications, the simulation results show that this work can reduce the PAPR values clearly and show capable results over the ones in the literature.

关键词： Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing RADAR Peak to Average Power Ratio Pulse Width Modulation

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