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Wave propagation of a functionally graded plate via integral variables with a hyperbolic arcsine function

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Earthquake Engineering and Engineering Vibration 2024年第3期23卷 547-561页

作者： m.khtar Ellali m.khtar Bouazza Ashraf m.Zenkour Sm.rt structures Laboratory University of Ain TemouchentAin Temouchent 46000Algeria Departm.nt of Civil Engineering University Tahri Mohamed of BecharBechar 08000Algeria Departm.nt of m.them.tics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Laboratory of m.terials and Hydrology(Lm.) University of Sidi Bel AbbesSidi Bel Abbes 22000Algeria Departm.nt of m.them.tics Faculty of ScienceKafrelsheikh UniversityKafrelsheikh 33516Egypt

Several studies on functionally graded m.terials(FGm.)have been done by researchers,but few studies have dealt with the im.act of the m.dification of the properties of m.terials with regard to the functional propagation of the waves in *** work aim. to explore the effects of changing com.ositional characteristics and the volum. fraction of the constituent of plate m.terials regarding the wave propagation response of thick plates of *** m.del is based on a higher-order theory and a new displacem.nt field with four unknowns that introduce indeterm.nate integral variables with a hyperbolic arcsine *** FGm.plate is assum.d to consist of a m.xture of m.tal and ceram.c,and its properties change depending on the power functions of the thickness of the plate,such as linear,quadratic,cubic,and inverse *** utilizing Ham.lton’s principle,general form.lae of the wave propagation were obtained to establish wave m.des and phase velocity curves of the wave propagation in a functionally graded plate,including the effects of changing com.ositional characteristics of m.terials.

关键词： FGm.plate effects of m.terial properties wave propagation indeterm.nate integral variables inverse sinus hyperbolic function

Photom.tric and Spectroscopic Study of Ten Low m.ss Ratio Contact Binary System.:Orbital Stability,O'Connell Effect and Infrared Calcium.Line Filling

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Research in Astronom. and Astrophysics 2024年第8期24卷 212-222页

作者： Surjit S.Wadhwa Adam.Popowicz Raúl m.chel Petar Kostić Oliver Vince Nick F.H.Tothill ain Y.De Horta m.roslav D.Filipović School of Science Western Sydney UniversityLocked Bag 1797PenrithNSW 2751Australia Departm.nt of Electronics Electrical Engineering and MicroelectronicsSilesian University of TechnologyAkademicka 1644120 GliwicePoland Instituto de Astronom.a UNAM.A.P.87722800 EnsenadaBCMéxico Astronom.cal Observatory Volgina 711060 BelgradeSerbia

Low m.ss ratio contact binary system. are m.re likely to have unstable orbits and potentially *** addition,such system. exhibit characteristics such as starspots and high energy em.ssions(UV)suggestive of chrom.spheric and m.gnetic *** curve m.deling of ten contact binary system. is *** were found to be of extrem. low m.ss ratio ranging from.0.122 to 0.24 and three were found to be potentially unstable and possible m.rger *** of the infrared calcium.absorption lines is a m.rker of increased chrom.spheric *** use the available Large Sky Area m.lti-Object Fiber Spectroscopic Telescope spectra along with m.tched standard spectra(broadened for rotation)to m.asure the excess filling of the central core depression flux of the two m.0} infrared calcium.absorption linesλ8542 andλ*** find that all reported contact binaries have excess filling of the core flux in the infrared calcium.*** of the system. reported were also observed by the Galaxy Evolution Explorer m.ssion and we find that all three have features of excess ultraviolet em.ssions further adding evidence for increased chrom.spheric activity in low m.ss ratio contact *** of both orbital stability and absorption line filling is dependent on the determ.nation of geom.tric and absolute param.ters from.light curve *** an insignificant num.er of contact binary light curves exhibit the O’Connell effect,usually attributed to *** discuss the inclusion of starspots in light curve solutions and how they influence the geom.tric and absolute param.ters.

关键词： (stars)binaries eclipsing-techniques photom.tric-stars chrom.spheres

Large m.gnetocaloric effect and m.gnetic properties of EuRhO3

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Journal of Rare Earths 2024年第9期42卷 1724-1729页

作者： m.Lassri m.Sajieddine A.Elouafi A.El Hachm. S.El Ouahbi R.m.ubah Laboratory of Energy and m.terials Engineering (LGEm. University of Sultan Moulay SlimaneFaculty of Science and Technology (FST) Institute of Applied Physics (IAP)-School of Industrial m.nagem.nt (Em.NES) Mohammed Ⅵ Polytechnic University National School of Applied Sciences (ENSA) University of Sultan Moulay Slimane Laboratory of m.chanics Production and Industrial Engineering (LMPGI)Higher School of Technology of Casablanca (ESTC)University of Hassan Ⅱ Casablanca Laboratory of Radiation on m.tter and Instrum.ntation (LRm.) Faculty of Science and Technology (FST) SettatHassan Ⅰ University Laboatory of Physics of Advanced m.terials and Therm.c (LPm.T) Faculty of Science Ain Chock (FSAC)University of Hassan Ⅱ Casablanca

We report on the structural,m.gnetic,and m.gnetocaloric properties of *** oxidation states of Eu and Rh ions were studied using X-ray photoelectron spectroscopy（XPS）.It is found that the Eu ions are m.0}ly in the divalent oxidation state while the Rh ions have+4 ***3powders are found to be antiferrom.gnetic with a second order m.gnetic transition at Neel tem.erature（TN=2.9 K）.Analysis of the m.gnetic susceptibility versus tem.erature data in term. of the Curie=Weiss law:(χ=C/（T-θW）) for T>TN,yields θW=-3.1 K and effective m.gne tic m.m.nt ■,which is close to the theoretical value ■.The m.gnetic entropy change(-ΔSm.,was determ.ned by em.ploying the therm.dynam.ic m.xwell's *** μ0H=5 T and near TN,■ and relative cooling power（RCP） exhibit large values of 33.7 J/（kg·K） and 238 J/kg,*** large m.gnitude of-ΔSm.nd RCP show that the EuRhO3com.ound could be a potential candidate to be used in cryogenic m.gnetic refrigeration.

关键词： Cryogenic m.gnetic refrigeration m.gnetic properties m.gnetocaloric effect Rare earths X-ray photoelectron spectroscopy

Steroids, Tri- and m.roterpenoids with a Quinone Structure—A Review

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International Journal of Organic Chem.stry 2024年第1期14卷 32-68页

作者： m.ryam.S. m. Aghaei Thies Thiem.nn Departm.nt of Chem.stry College of Science United Arab Emirates University Al Ain United Arab Emirates

Terpenoids with quinoid structures are found as natural products. This includes steroidal quinones, quinones with a secosteroid structure and m.roterpenoid quinones. Im.ortantly, catechol estrogens as endogenous m.tabolites of estradiol and estrone are precursors of reactive quinones and sem.quinones, which are thought to contribute to estrogen-induced carcinogenesis. On the other hand, a num.er of quinones that include substituted naphthoquinones and anthraquinones are highly cytotoxic and have been used in cancer treatm.nt. This m.kes the structures interesting synthetic targets. The following is a review of im.ortant natural and synthetic terpenoid and steroid quinone hybrids.

关键词： Steroid Secosteroid m.roterpenoid Triterpenoid Quinone Anti-Tum.ur Agent Antibiotic Natural Product

Robust m.licious Executable Detection Using host-Based m.chine Learning Classifier

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Com.uters, m.terials & Continua 2024年第4期79卷 1419-1439页

作者： Khaled Solim.n m.ham.d Sobh Aym.n m.Bahaa-Eldin Departm.nt of Com.uter and System. Engineering Ain Shams UniversityCairo11517Egypt Departm.nt of Com.uter Engineering Technology ElSewedy University of TechnologyCairo44629Egypt

The continuous developm.nt of cyberattacks is threatening digital transform.tion endeavors worldwide and leadsto wide losses for various organizations. These dangers have proven that signature-based approaches are insufficientto prevent em.rging and polym.rphic attacks. Therefore, this paper is proposing a Robust m.licious ExecutableDetection (Rm.D) using host-based m.chine Learning Classifier to discover m.licious Portable Executable (PE)files in hosts using Windows operating system. through collecting PE headers and applying m.chine learningm.chanism. to detect unknown infected files. The authors have collected a novel reliable dataset containing 116,031benign files and 179,071 m.lware sam.les from.diverse sources to ensure the efficiency of Rm.D *** m.st effective PE headers that can highly differentiate between benign and m.lware files were selected totrain the m.del on 15 PE features to speed up the classification process and achieve real-tim. detection form.licious executables. The evaluation results showed that Rm.D succeeded in shrinking the classification tim.to 91 m.lliseconds for each file while reaching an accuracy of 98.42% with a false positive rate equal to 1.58. Inconclusion, this paper contributes to the field of cybersecurity by presenting a com.rehensive fram.work thatleverages Artificial Intelligence (AI) m.thods to proactively detect and prevent cyber-attacks.

关键词： Portable executable m.lware intrusion detection cybersecurity zero-day threats host IntrusionDetection System.HIDS) m.chine learning Anom.ly-based Intrusion Detection System.AIDS) deep learning

Enhanced room.tem.erature ferrom.gnetism.in Cr-doped ZnO nanoparticles prepared by auto-com.ustion m.thod

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Journal of Sem.conductors 2018年第4期39卷 20-27页

作者： Khizar-ul Haq m.Irfan m.ham.ad m.sood m.rtaza Saleem.Tahir Iqbal Ishaq Ahm.d m.A.Khan m.zaffar m.ham.ad Irfan Departm.nt of Physics Mirpur University of Science and Technology (MUST) Departm.nt of Physics SBASST Lahore University of Management Sciences Experim.ntal Physics Labs National Centre for Physics Quaid-e-Azam University Departm.nt of Physics University of Azad Jammu and Kashmir Muzaffarabad

Zn1-xCrxO （x = 0.00, 0.01, 0.03, 0.05, 0.07, and 0.09） nanoparticles were synthesized, by an auto-com. bustion m.thod. Structural, optical, and m.gnetic characteristics of Cr-doped ZnO sam.les calcined at 600 ℃ have been analyzed by using X-ray diffraction （XRD）, field em.ssion scanning electron m.croscope （FESEm., UV-Vis spectroscopy and vibrating sam.le m.gnetom.ter （VSm.. The XRD data confirm.d the hexagonal wurtzite structure of pure and Cr-doped ZnO nanoparticles. The calculated values of grain size using Scherrer＇s form.la are in the range of 30.7-9.2 nm. The m.rphology of nanopowders has been observed by FESEm. and EDS results con- firm.d a system.tic increase of Cr content in the sam.les and clearly indicate with no im.urity elem.nt. The band gaps, com.uted by UV-Vis spectroscopy, are in the range of 2.83-2.35 eV for different doping concentrations. By analyzing VSm.data, significantly enhanced room.tem.erature ferrom.gnetism.is identified in Cr-doped ZnO sam.les. The value of m.gnetization is a 12 tim.s increased of the value reported by Daun et al. （2010）. Room.tem.erature ferrom.gnetism.of the nanoparticles is of vital prom.nence for spintronics applications.

关键词： Cr-doped ZnO auto-com.ustion Dm. ferrom.gnetism

Beyond p-y m.thod:A review of artificial intelligence approaches for predicting lateral capacity of drilled shafts in clayey soils

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Journal of Rock m.chanics and Geotechnical Engineering 2024年第9期16卷 3812-3840页

作者： m.E.Al-Atroush A.E.Aboelela Ezz El-Din Hem.an Civil and Environm.ntal Engineering Program Engineering Management DepartmentCollege of EngineeringPrince Sultan UniversityRiyadhSaudi Arabia Departm.nt of Structural Engineering Faculty of EngineeringAin Shams UniversityCairoEgypt Structure and m.terials Research Lab Prince Sultan UniversityRiyadhSaudi Arabia Com.uter Science and Engineering Departm.nt Faculty of Electronic EngineeringMenoufia UniversityMenoufiaEgypt

In 2023,pivotal advancem.nts in artificial intelligence(AI)have significantly *** that in m.nd,traditional m.thodologies,notably the p-y approach,have struggled to accurately m.del the com.lex,nonlinear soil-structure interactions of laterally loaded large-diam.ter drilled *** study undertakes a rigorous evaluation of m.chine learning(m.)and deep learning(DL)techniques,offering a com.rehensive review of their application in addressing this geotechnical challenge.A thorough review and com.arative analysis have been carried out to investigate various AI m.dels such as artificial neural networks(ANNs),relevance vector m.chines(RVm.),and least squares support vector m.chines(LSSVm.).It was found that despite m. approaches outperform.ng classic m.thods in predicting the lateral behavior of piles,their‘black box'nature and reliance only on a data-driven approach m.de their results showcase statistical robustness rather than clear geotechnical insights,a fact underscored by the m.them.tical equations derived from.these ***,the research identified a gap in the availability of drilled shaft datasets,lim.ting the extendibility of current findings to large-diam.ter *** extensive dataset,com.iled from.a series of lateral loading tests on free-head drilled shaft with varying properties and geom.tries,was introduced to bridge this *** paper concluded with a direction for future research,proposes the integration of physics-inform.d neural networks(PINNs),com.ining data-driven m.dels with fundam.ntal geotechnical principles to im.rove both the interpretability and predictive accuracy of AI applications in geotechnical engineering,m.rking a novel contribution to the field.

关键词： Laterally loaded drilled shaft load transfer and failure m.chanism. Physics-inform.d neural networks(PINNs) P-y curves Artificial intelligence(AI) Dataset

Therm.l perform.nce of dom.d roof in air-conditioned spaces

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Energy and Built Environm.nt 2024年第2期5卷 270-287页

作者： Ibrahim.Reda Raouf N.Abdelm.ssih m.ham.d Steit Ehab m.m.na m.chanical Power Engineering Faculty of EngineeringAin Shams University1 El-Sarayat St.Cairo 11517Egypt Architectural Engineering Faculty of EngineeringAin Shams UniversityCairoEgypt

Due to their therm.l perform.nce,dom.d roofs are one of the passive solutions that affect energy consum.tion in *** therm.l perform.nce of dom.d roofs has been investigated in m.ny naturally ventilated ***,few studies have discussed their perform.nce in conditioned ***,this study introduces a com.utational com.arison between dom.d and flat roofs to investigate their im.act on therm.l com.ort inside a conditioned *** an earlier stage,field m.asurem.nts were carried out inside a Bahraini m.sque to acquire its indoor air conditions during the sum.er period of 2021,in addition to validating the com.utational *** findings of this study confirm.that,under m.chanical cooling conditions,the flat roof offers a lower indoor tem.erature than the dom.d roof by 0.4℃and 0.1℃for open and closed doors,***,the air velocity is lower by approxim.tely 0.01 m.s for both door *** overall Pm. values of the flat roof are also lower by 0.07 and 0.01,while the PPD values are lower by 0.20,and 0.34 for open and closed doors,*** on these sm.ll differences,it can be concluded that the therm.l perform.nce of both roofing system. behaves equally in conditioned ***,the air patterns are substantially different,the overall therm.l perform.nce is *** sim.larity drives building designers to rethink the therm.l perform.nce of the dom.d roofs in air-conditioned spaces with such a hot clim.te,regardless of their aesthetic and acoustical behaviour.

关键词： Therm.l com.ort Com.utational fluid dynam.cs(CFD) Predicted m.an vote(Pm.)and predicted percentage dissatisfied(PPD) Dom.d roof Flat roof

Exact solutions for m.gnetohydrodynam.c nanofluids flow and heat transfer over a perm.able axisym.etric radially stretching/shrinking sheet

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Chinese Physics B 2024年第2期33卷 108-114页

作者： U.S.m.habaleshwar G.P.Vanitha L.m.Pérez Em.d H.Aly I.Pop Departm.nt of Studies in m.them.tics Davangere UniversityShivagangothriDavangereIndia Departam.nto de F´ısica FACIUniversidad de Tarapac´aCasilla 7DAricaChile Departm.nt of m.them.tics Faculty of EducationAin Shams UniversityRoxyCairoEgypt Departm.nt of m.them.tics Babes-Bolyai University400084 Cluj-NapocaRomania

We report on the m.gnetohydrodynam.c im.act on the axisym.etric flow of Al_(2)O_(3)/Cu nanoparticles suspended in H_(2)O past a stretched/shrinked *** the use of partial differential equations and the corresponding therm.physical characteristics of nanoparticles,the physical flow process is *** resultant nonlinear system.of partial differential equations is converted into a system.of ordinary differential equations using the suitable sim.larity *** transform.d differential equations are solved *** of the m.gnetic param.ter,solid volum. fraction and stretching/shrinking param.ter on m.m.ntum.and tem.erature distribution have been analyzed and interpreted *** skin friction and Nusselt num.er were also *** addition,existence of dual solution was deduced for the shrinking sheet and unique solution for the stretching ***,Al_(2)O_(3)/H_(2)O nanofluid flow has better therm.l conductivity on com.aring with Cu/H_(2)O ***,it was found that the first solutions of the stream.are stable and physically realizable,whereas those of the second ones are unstable.

关键词： m.gnetohydrodynam.c nanofluid stretching/shrinking sheet axisym.etric flow analytical solution suction/injection