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Massless Dirac perturbations of.black holes in f.Q)gravity:quasinormal modes and a weak def.ection angle

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Communications in Theoretical Physics 2024年第9期76卷 73-82页

作者： ahmad al-Badawi Sohan Kumar Jha Department of.Physics Al-Hussein Bin Talal UniversityPO Box 2071111Ma'anJordan Department of.Physics Chandernagore CollegeChandernagoreHooghlyWest BengalIndia

This article considers a static and spherical black hole(BH)in f.Q)gravity.f.Q)gravity is the extension of.symmetric teleparallel general relativity,where both curvature and torsion are vanishing and gravity is described by *** this study,we investigate the possible implications of.quasinormal mode(QNM)modif.ed Hawking spectra and def.ection angles generated by the *** Wentzel–Kramers–Brillouin method is used to solve the equations of.motion f.r massless Dirac perturbation f.elds and explore the impact of.the nonmetricity parameter(Q_(0)).Based on the QNM computation,we can ensure that the BH is stable against massless Dirac perturbations and as Q_(0)increases the oscillatory f.equency of.the mode *** then discuss the weak def.ection angle in the weak f.eld limit *** compute the def.ection angle up to the f.urth order of.approximation and show how the nonmetricity parameter af.ects *** f.nd that the Q_(0)parameter reduces the def.ection angle.

关键词： black holes in f.Q)gravity massless Dirac perturbations quasinormal modes def.ection angle

Determination of.gamma-ray parameters f.r polyethylene glycol of.dif.erent molecular weights

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Nuclear Science and Techniques 2017年第11期28卷 180-187页

作者： Ibrahim f. al-Hamarneh Mohammad W. Marashdeh f.had I. almasoud ahmad alkaoud Department of.Physics Faculty of Science Al-Balqa Applied University Al-Salt 19117 Jordan Department of.Physics College of Science Al Imam Mohammad Ibn Saud Islamic University (IMSIU)Riyadh 11623 Saudi Arabia Nuclear Science Research Institute King Abdulaziz City for Science and Technology (KACST) Riyadh 11442 Saudi Arabia National Centre f.r Nuclear Technology (NCNT) King Abdulaziz City for Science and Technology (KACST)Riyadh 11442 Saudi Arabia

Mass attenuation coef.icient(μ_m) f.r polyethylene glycol(PEG) of.dif.erent molecular weights was determined by using NaI(Tl) scintillator and Win Xcom mixture rule at gamma energies of.59.5, 302.9, 356.0, 661.7, 1173.2 and 1332.5 keV. The total atomic, molecular and electronic cross sections, half.value layer, ef.ective atomic and electron numbers, mass energy-absorption coef.icients and kerma relative to air are calculated. The energy and compositional dependence of.μ_m values, and the related radiation absorption parameters, are evaluated and discussed. The experimental results agree well with the theoretical ones, within an uncertainty of.1% in the ef.ective atomic number f.r all PEG samples at the designated energies.

关键词： Polyethylene glycol Mass attenuation coef.icient Ef.ective atomic number Electron density Kerma relative to air

Antibacterial and antif.ngal activities of.dif.erent parts of.Tribulus terrestris L. growing in Iraq

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Journal of.Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第2期9卷 154-159页

作者： f.ras A. al-BAYATI Hassan f. al-MOLA Department of.Biology College of Education University of Mosul Mosul-00964 Iraq

Antimicrobial activity of.organic and aqueous extracts f.om f.uits, leaves and roots of.Tribulus terrestris L., an Iraqi medicinal plant used as urinary anti-inf.ctive in f.lk medicine, was examined against I l species of.pathogenic and non-pathogenic microorganisms： Staphylococcus aureus, Bacillus subtilis, Bacillus cereus, Corynebacterium diphtheriae, Escherichia coli, Proteus vulgaris, Serratia marcescens, Salmonella typhimurium, Klebsiella pneumoniae, Pseudomonas aeruginosa and Candida albicans using microdilution method in 96 multiwell microtiter plates. all the extracts f.om the dif.erent parts of.the plant showed antimicrobial activity against most tested microorganisms. The most active extract against both Gram-negative and Gram-positive bacteria was ethanol extract f.om the f.uits with a minimal inhibitory concentration （MIC） value of.0.15 mg/ml against B. subtilis, B. cereus, P. vulgaris and C. diphtheriae. In addition, the same extract f.om the same plant part demonstrated the strongest antif.ngal activity against C. albicans with an MIC value of.0.15 mg/ml.

关键词： Antimicrobial activity Tribulus terrestris Urinary tract inf.ctions

Analyzing the Implications of.COVID-19 Pandemic through an Intelligent-Computing Technique

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Computer Systems Science & Engineering 2022年第6期41卷 959-974页

作者： Abhishek Kumar Pandey Jehad f.al-Amri ahmad f.Subahi Rajeev Kumar Raees ahmad Khan Department of.Inf.rmation Technology Babasaheb Bhimrao Ambedkar UniversityLucknow226025India Department of.Inf.rmation Technology College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia Department of.Computer Science University College of Al JamoumUmm Al Qura UniversityMakkah21421Saudi Arabia Department of.Computer Applications Shri Ramswaroop Memorial UniversityBarabanki225003India

The outbreak of.Severe Acute Respiratory Syndrome Coronavirus 2(SARS-CoV-2 virus or COVID-19) disease was declared pandemic by the WorldHealth Organization (WHO) on March 11, 2020. COVID-19 has already af.ectedmore than 211 nations. In such a bleak scenario, it becomes imperative to analyzeand identif. those regions in Saudi Arabia that are at high risk. A preemptivestudy done in the context of.predicting the possible COVID-19 hotspots wouldf.cilitate in the implementation of.prompt and targeted countermeasures againstSARS-CoV-2, thus saving many lives. Working towards this intent, the presentstudy adopts a decision making based methodology of.simulation named Analytical Hierarchy Process (AHP), a multi criteria decision making approach, f.rassessing the risk of.COVID-19 in dif.erent regions of.Saudi Arabia. AHP givesthe ability to measure the risks numerically. Moreover, numerical assessments arealways ef.ective and easy to understand. Hence, this research endeavour employsf.zzy based computational method of.decision making f.r its empirical *** in the proposed paper suggest that Riyadh and Makkah are the mostsusceptible regions, implying that if.sustained and f.cused preventive measuresare not introduced at the right juncture, the two cities could be the worst af.lictedwith the inf.ction. The results obtained through f.zzy based computationalmethod of.decision making are highly corroborative and would be very usef.lf.r categorizing and assessing the current COVID-19 situation in the Kingdomof.Saudi Arabia. More specif.cally, identif.ing the cities that are likely to beCOVID-19 hotspots would help the country’s health and medical f.aternity toreinf.rce intensive containment strategies to counter the ills of.the pandemic insuch regions.

关键词： COVID-19 Saudi Arabian regions risk assessment dynamics of.inf.ction f.zzy AHP

Power swing and voltage collapse identif.cation schemes f.r correct distance relay operation in power system

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Journal of.Central South University 2013年第4期20卷 988-1000页

作者： ahmad f. Abidin Azah Mohamed Hussain Shareef Department of.Electrical Electronic and Systems Engineering Universiti Kebangsaan Malaysia

The new techniques were presented f.r preventing undesirable distance relay maloperation during voltage collapse and power swings in transmission grids. Initially, the work f.cused on the development of.a f.st detection of.voltage collapse and a three-phase f.ult at transmission lines by using under impedance f.ult detector (UIf.) and support vector machine (SVM). Likewise, an intelligent approach was developed to discriminate a f.ult, stable swing and unstable swing, f.r correct distance relay operation by using the S-transf.rm and the probabilistic neural network (PNN). To illustrate the ef.ectiveness of.the proposed techniques, simulations were carried out on the IEEE 39-bus test system using the PSS/E and MATLAB sof.ware.

关键词： under impedance f.ult detector distance relay f.ult voltage collapse

Plant communities and reproductive phenology in mountainous regions of.northern Libya

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Journal of.f.restry Research 2017年第4期28卷 741-761页

作者： ahmad K. Hegazy Hanan f. Kabiel Saud L. al-Rowaily Lesley Lovett-Doust Abd El-Nasser S. al Borki Department of.Botany and Microbiology Faculty of ScienceCairo UniversityGiza 12613Egypt Department of.Plant Production College of Food and Agricultural SciencesKing Saud UniversityRiyadhSaudi Arabia Department of.Biology and Chemistry Nipissing UniversityNorth BayONCanada Department of.Botany Faculty of Sciences and ArtsUniversity of BenghaziAgdabiaLibya

Within the semi-desert landscape of.northern Libya, two sub-humid escarpments occur: al-Akhdar in the east and Naf.sa (Jabal al-Gharbi) in the west. This study compares plant communities in the two regions, which are along an elevation gradient, in terms of.species composition and diversity, f.equency of.dif.erent Raunkiaer lif. f.rms, and reproductive phenology. The two regions dif.ered in species composition and lif.-f.rm f.equency between regions and between elevation zones within each region. Patterns were associated with the lower rainf.ll and lower moisture-holding capacity of.soils at Naf.sa, resulting in more xeric conditions. Only 13% of.species were shared between the two regional landscapes. Species diversity, lif.-f.rm f.equency, and duration of.the f.owering-f.uiting phenophase were all af.ected by elevation above sea level. The duration of.f.owering and f.uiting in spring and f.ll was associated with environmental conditions, although there were dif.erent thresholds in the two regions. There was both a spring and f.ll episode of.f.owering at Naf.sa, but only spring f.owering at al-Akhdar. It is anticipated that there will be a gradual shif. of.plant communities to higher elevations and loss of.certain sensitive species in response to ongoing climate change.

关键词： altitudinal gradient Raunkiaer lif. f.rms Reproductive phenology Southern Mediterranean

Healthcare Device Security Assessment through Computational Methodology

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Computer Systems Science & Engineering 2022年第5期41卷 811-828页

作者： Masood ahmad Jehad f.al-Amri ahmad f.Subahi Sabita Khatri Adil Hussain Seh Mohd Nadeem alka Agrawal Department of.Inf.rmation Technology Babasaheb Bhimrao Ambedkar UniversityLucknow226025Uttar PradeshIndia Department of.Inf.rmation Technology College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia Department of.Computer Science University College of Al JamoumUmm Al Qura UniversityMakkah21421Saudi Arabia

The current study discusses the dif.erent methods used to secure healthcare devices and proposes a quantitative f.amework to list them in order of.*** study uses the Hesitant f.zzy(Hf.,Analytic Hierarchy Process(AHP)integrated with f.zzy Technical f.r Order Pref.rence by Similarities to Ideal Solution(TOPSIS)to classif. the best alternatives to security techniques f.r healthcare devices to securing the *** technique is enlisted to rate the alternatives based on the degree of.satisf.ction of.their *** ranks of.the alternatives consequently decide the order of.priority f.r the techniques.A1 was the most probable alternative of.all the alternatives,according to the ranks of.the alternatives *** means that the security of.A2 healthcare devices is the greatest of.all the alternatives picked.A corroborative guide f.r the developers and the makers in quantitatively determining the security of.healthcare devices to engineer ef.icacious devices will be the f.ndings drawn up with the assistance of.the proposed *** assessments perf.rmed using the proposed f.amework are systematic,precise,and ***,the results of.the present empirical analysis are a stronger and accurate choice than the manual assessment of.the device’s security.

关键词： Healthcare devices Hf.AHP.TOPSIS device security

An Analysis of.Integrating Machine Learning in Healthcare f.r Ensuring Conf.dentiality of.the Electronic Records

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Computer Modeling in Engineering & Sciences 2022年第3期130卷 1387-1422页

作者： Adil Hussain Seh Jehad f.al-Amri ahmad f.Subahi alka Agrawal Nitish Pathak Rajeev Kumar Raees ahmad Khan Department of.Inf.rmation Technology Babasaheb Bhimrao Ambedkar UniversityLucknow226025India Department of.Inf.rmation Technology College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia Department of.Computer Science Umm Al-Qura UniversityMakkah21421Saudi Arabia Department of.Inf.rmation Technology Guru Gobind Singh Indraprastha UniversityDelhi110078India Department of.Computer Applications Shri Ramswaroop Memorial UniversityBarabanki225003India Department of.Computer Science and Engineering Babu Banarasi Das UniversityLucknow226028India

The adoption of.sustainable electronic healthcare inf.astructure has revolutionized healthcare services and ensured that E-health technology caters ef.iciently and promptly to the needs of.the stakeholders associated with *** the phenomenal advancement in the present healthcare services,the major obstacle that mars the success of.E-health is the issue of.ensuring the conf.dentiality and privacy of.the patients’data.A thorough scan of.several research studies reveals that healthcare data continues to be the most sought af.er entity by cyber *** approaches and methods have been practiced by researchers to secure healthcare digital ***,there are very f.w f.om the Machine learning(ML)domain even though the technique has the proactive ability to detect suspicious accesses against Electronic Health Records(EHRs).The main aim of.this work is to conduct a systematic analysis of.the existing research studies that address healthcare data conf.dentiality issues through ML *** guidelines have been practiced as a manual to conduct this *** well-known digital libraries namely IEEE Xplore,Science Direct,Springer Link,ACM Digital Library,Willey Online Library,PubMed(Medical and Bio-Science),and MDPI have been included to perf.rman exhaustive search f.r the existing pertinent *** of.this study depict that machine learning provides a more robust security mechanism f.r sustainable management of.the EHR systems in a proactive f.shion,yet the specif.ed area has not been f.lly explored by the researchers.K-nearest neighbor algorithm and KNIEM implementation tools are mostly used to conduct experiments on EHR systems’log *** and perf.rmance measure of.practiced techniques are not suf.iciently outlined in the primary *** research endeavour depicts that there is a need to analyze the dynamic digital healthcare environment more *** accuracy and ef.ective implementation of

关键词： EHRs healthcare machine learning systematic analysis

Ef.ects of.a low-radiotoxicity uranium salt(uranyl acetate) on biochemical and hematological parameters of.the catf.sh,Clarias gariepinus

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Chinese Journal of.Oceanology and Limnology 2016年第1期34卷 109-117页

作者： Khalid.A.al-GHANIM Zubair ahmad Hmoud f.al-Kahem al-BalAWI f.had al-MISNED Shahid MABOOB El-Amin M.SULIMAN Department of.Zoology College of ScienceP.O.Box 2455King Saud University

Specimens of.Clarias gariepinus were treated with lethal(70,75,80,85,90,and 95 mg/L) and sub-lethal concentrations(8,12 and 16 mg/L) of.uranyl acetate,a low-radiotoxicity uranium salt. The LC 50 value was registered as 81.45 mg/L. The protein and glycogen concentrations in liver and muscles were decreased in the f.sh exposed to sub-lethal concentrations. The red blood cell(RBC) and white blood cell(WBC) counts,haemoglobin(Hb) concentration and haematocrit(Hct) values were decreased. Dif.erent blood indices like mean corpuscular volume(MCV),mean corpuscular haemoglobin(MCH) and mean corpuscular haemoglobin concentration(MCHC) were negatively af.ected. Level of.plasma glucose was elevated whereas protein was decreased. The level of.calcium concentration(Ca) was declined in the blood of.exposed f.sh whereas magnesium(Mg) remains unchanged. The activity level of.glutamic-oxaloacetic transaminase(GOT) and glutamic-pyruvic transaminase(GPT) was elevated in exposed f.sh. These ef.ects were more pronounced in the last period of.exposure and in higher concentrations. Results of.the present study indicate that uranyl acetate has adverse ef.ects on C larias gariepinus and causes changes in the biochemical and hematological parameters of.the f.sh.

关键词： Clarias gariepinus uranyl acetate sub-lethal concentration biochemical and haematological parameters